JP5881411B2 - Throttle valve device - Google Patents

Description

  The present invention relates to a structure of a throttle valve device.

2. Description of the Related Art Conventionally, a throttle valve device having a throttle valve for controlling an intake air amount to an engine is known. As shown in Patent Document 1, some throttle valve devices include two throttle valves, a main throttle valve and a sub throttle valve, in the same intake passage. The main throttle valve is opened and closed in conjunction with the driver's throttle operation. The sub-throttle valve is installed on the upstream side of the main throttle valve, and is opened and closed in accordance with the operating condition of the engine.
Further, as shown in Patent Document 2, as a throttle valve device for motorcycle engines such as motorcycles, a throttle valve for a multi-cylinder engine in which a throttle valve is arranged in each intake passage corresponding to each cylinder (intake port). Devices are also common.

JP 2002-317654 A JP 2002-242680 A

  An example of a conventionally known throttle valve device is shown in FIG. In the throttle valve device 110, an intake passage 114 is formed inside a throttle body 112, and a main throttle valve 118 fixed to a main throttle shaft 116 and a sub-throttle fixed to a sub-throttle shaft 120 in the intake passage 114. Two throttle valves of the valve 122 are rotatably provided. The intake passage 114 includes a downstream intake passage portion 124 having a main throttle valve 118, an upstream intake passage portion 126 having a sub-throttle valve 122, the downstream intake passage portion 124 and the upstream intake passage portion 126. And a communication passage portion 128 for communicating with each other. The downstream side intake passage portion 124 and the upstream side intake passage portion 126 have a cylindrical shape (circular cross section), the communication passage portion 128 has a partial conical shape, and the central axis of the upstream side intake passage portion 126 and the downstream side intake air The central axis of the passage portion 124 and the central axis of the communication passage portion 128 are arranged on the same axis line (OO line). In general, the diameter of the sub throttle valve 122 is larger than that of the main throttle valve 118 in order to increase the intake efficiency, and the inner diameter of the upstream intake passage portion 126 is larger than the inner diameter of the downstream intake passage portion 124. Also has a large diameter.

  In the case of motorcycles such as motorcycles, it is necessary to install a throttle valve device in a storage space narrower than that of a four-wheeled vehicle, and the throttle body is smaller in order to make effective use of the limited storage space. Is required. However, for example, in the case where a plurality of intake passages are connected in parallel, such as a throttle valve device for a multi-cylinder engine, there is a problem that the lateral width of the entire throttle body becomes large. In particular, since the intake passage portion on the sub throttle valve side has a larger diameter than the intake passage portion on the main throttle valve side, the lateral width of the throttle body on the sub throttle valve side becomes larger than necessary. On the other hand, if the throttle body itself is downsized, the intake passage becomes narrower and the flow resistance increases, which causes other problems such as a reduction in the amount of air sucked into the throttle valve device and a decrease in the accuracy of air amount control. It may occur and is not preferable.

  Accordingly, the present invention has been made in view of the above problems, and in the throttle valve device, the entire throttle body can be reduced in size without narrowing each intake passage, and the throttle body can be reduced. It is an object of the present invention to provide a throttle valve device capable of generating a space that can be effectively used around.

In order to solve the above-mentioned problem, a throttle valve device according to the first aspect of the present invention includes a downstream intake passage portion, an upstream intake passage portion having a diameter larger than that of the downstream intake passage portion, and the downstream intake passage portion. And the upstream intake passage portion, and an intake passage formed by a tapered communication passage portion is provided in the throttle body, and the downstream intake passage portion or the upstream side of the intake passage is provided. In a throttle valve device in which a throttle valve is arranged in at least one of the intake passage portions, the central axis of the upstream intake passage portion and the central axis of the downstream intake passage portion are arranged in parallel, and one central axis thereof In the direction perpendicular to the axial direction from the same position as the other central axis and extending in the direction in which the shaft axis of the throttle valve extends.
The throttle valve device according to a second aspect of the invention is characterized in that the inner wall of the downstream intake passage portion is located inside the inner wall of the upstream intake passage portion in a cross-sectional view orthogonal to the central axis. .
Throttle valve device according to the third aspect of the present invention, the main comprising a main throttle shaft with a main throttle valve disposed on the downstream side intake passage portion, the sub-throttle valve disposed on the upstream side intake passage portion and a sub throttle shaft Ru extending to the throttle shaft in the same direction, parallel to the central axis of the upstream intake passage portion between the central axis and the same axial state to pre SL main slot Cie Yafuto axis of the downstream side intake passage portion It is characterized by being eccentric.
According to a fourth aspect of the present invention, the throttle valve device according to the present invention is disposed outside the throttle body, and an adjacent member connected to the throttle shaft is disposed at a position adjacent to the intake passage, and the upstream side intake air in the intake passage is disposed. The center axis of the passage portion is eccentric to the side opposite to the side where the adjacent member is disposed.
According to a fifth aspect of the present invention, there is provided a throttle valve device comprising: a central axis of the upstream intake passage portion in at least one of the plurality of intake passages provided in the throttle body, the downstream side The throttle body is eccentric to the center position direction side of the throttle body with respect to the central axis of the intake passage portion.
The throttle valve device according to a sixth aspect of the present invention includes two intake passages in the throttle body, and the central axes of the two upstream intake passage portions are eccentric to the inner side in the parallel direction of the intake passages. It is characterized by that.
According to a seventh aspect of the present invention, there is provided a throttle valve device in which a connecting member for connecting the throttle bodies is disposed at a position adjacent to the intake passage, and a central axis of the upstream intake passage portion in the intake passage is connected to the connecting member. It is characterized by being eccentric to the side opposite to the side on which the member is arranged.
The throttle valve device according to an eighth aspect of the invention is characterized in that a main throttle valve is provided in the downstream intake passage portion and a sub-throttle valve is provided in the upstream intake passage portion.
The throttle valve device according to a ninth aspect of the present invention forms a uniform diameter region in which the diameter of the upstream intake passage portion is constant downstream from the shaft shaft position of the throttle valve disposed in the upstream intake passage portion. It is characterized by that.
According to a tenth aspect of the present invention, there is provided a throttle valve device in which a taper is formed on both inner wall surfaces of the communication passage portion, and the taper on the outer side in the axial direction of the throttle valve shaft is made larger than the taper on the axial center position side of the throttle valve shaft. Characterized by being made smaller.

According to the throttle valve device of the present invention, one of the central axis of the downstream intake passage portion and the upstream intake passage portion that are conventionally positioned on the same axis is axially oriented with respect to the other central axis. By shifting in a direction perpendicular to the intake valve, the entire throttle valve device can be reduced in size without making the inside of the intake passage narrower, and a space (space) that can be effectively used around the throttle valve device can be created. For example, if the central axis of the downstream intake passage portion is deviated, a space can be formed by the amount deviated to the side opposite to the deviated side, and other parts are arranged in the space. It can be used effectively. Further, if the space is used for reinforcement such as thickening the throttle body itself, the rigidity or connection strength of the throttle body can be improved. In particular, when the inner wall of the downstream intake passage portion is positioned inside the inner wall of the upstream intake passage portion in a cross-sectional view orthogonal to the central axis (axial direction), the downstream intake passage portion having a small diameter is provided. Does not protrude outward in the radial direction of the upstream intake passage portion having a large diameter, and the entire throttle valve device can be downsized.
At this time, since the downstream intake passage portion and the upstream intake passage portion are connected by the tapered communication passage portion, the flow resistance in the communication passage portion can be suppressed. In consideration of the influence on the intake performance, the displacement width is preferably 4 mm or less. In this way, the overall size can be reduced without reducing the cross-sectional area of the intake passage (without reducing the intake efficiency), so that the passage area when fully open can be secured in the same way as before, and the intake performance is hindered. Nor.

Further , if the central axis of the upstream intake passage portion is deviated in parallel along the shaft axis of the throttle valve disposed in the downstream intake passage portion from a state where it is coaxial with the central axis of the downstream intake passage portion. The center of the upstream intake passage portion on a plane including the shaft axis of the throttle valve disposed in the downstream intake passage portion and the central axis of the downstream intake passage portion in a cross-sectional view orthogonal to the central axis (axial direction) The axis will be located. With this configuration, the central axis of the upstream intake passage portion is deviated in the shaft axis direction, but is not deviated in the direction orthogonal to the shaft axis. be able to.
Further , an adjacent member (a driving mechanism for driving the throttle shaft, a detecting means for detecting the amount of shaft angular displacement, or a connecting member for connecting the throttle bodies) is disposed at a position adjacent to the intake passage, If the central axis of the upstream intake passage portion in the intake passage is displaced to the side opposite to the side where the adjacent member is disposed (the direction away from the position of the adjacent member), the adjacent member interferes with the upstream intake passage portion. While preventing this, the space between the upstream intake passage portions can be narrowed. In particular, since a space can be generated at the position where the adjacent member is disposed, the degree of freedom in layout can be increased. For example, in the case of a throttle valve device for a four-cylinder engine in which two throttle bodies each having two intake passages are connected using connecting members (adjacent members), each upstream intake passage portion of each throttle body Is displaced inward from the central axis of the downstream intake passage portion, a space is created between the upstream portions of the throttle bodies, and the vacant space can be used effectively.

The present invention is also applicable to a throttle valve device for a multi-cylinder engine having a plurality of intake passages. In a throttle valve device for a multi-cylinder engine having a plurality of intake passages, the central axis of the upstream intake passage portion having a large diameter is set to the center side of the throttle valve device among the downstream intake passage portion and the upstream intake passage portion. By deviating, the lateral width of the throttle body can be reduced, and as a result, the entire throttle valve device can be reduced in size. At this time, if the inter-axis distance between the central axes of the upstream intake passage portions in the adjacent intake passages is correspondingly smaller than the inter-axis distance between the central axes of the adjacent downstream intake passage portions, the cylinder design Even when the space between the downstream intake passage portions is predetermined, the throttle body can be reduced in size.
The present invention is also applicable to a throttle valve device provided with two throttle valve of the main throttle valve and a sub throttle valve in one of the intake passage. At this time, if a uniform diameter region with a constant diameter of the upstream intake passage portion is formed downstream of the shaft shaft position of the throttle valve in the upstream intake passage portion, the throttle valve in the upstream intake passage portion is in operation. The interference between the throttle valve and the inner wall of the communication passage portion can be preferably prevented. Also, if the outer taper is made smaller than the taper on the central position side while forming the taper on both inner wall surfaces of the communication passage part, the taper on the central position side becomes smaller than the case where the outer inner wall of the communication path part is made flat. It is possible to prevent excess, suppress flow path resistance, and favorably prevent interference between the throttle valve and the inner wall of the communication passage portion.

1 is a schematic cross-sectional view showing a throttle valve device according to the present invention. It is the figure which showed notionally the shape of the AA cross section of the throttle valve apparatus shown in FIG. It is the schematic which compared the throttle valve apparatus which concerns on this invention, and the conventional throttle valve apparatus. It is a schematic sectional drawing which shows other embodiment of the throttle valve apparatus which concerns on this invention. It is a schematic sectional drawing which shows other embodiment of the throttle valve apparatus which concerns on this invention. It is a schematic sectional drawing which shows other embodiment of the throttle valve apparatus which concerns on this invention. It is a schematic sectional drawing which shows other embodiment of the throttle valve apparatus which concerns on this invention. It is a schematic sectional drawing which shows the conventional throttle valve apparatus.

Hereinafter, an embodiment of a throttle valve device according to the present invention will be described with reference to the drawings.
FIG. 1 is a schematic sectional view showing a throttle valve device according to the present invention, specifically, a throttle valve device for a four-cylinder engine. FIG. 2 is a cross-sectional view of the throttle valve device taken along the line AA. FIG. 3 is a schematic diagram comparing a throttle valve device (throttle valve device for a four-cylinder engine) according to the present invention and a conventional throttle valve device (throttle valve device for a four-cylinder engine).

  As shown in FIGS. 1 and 3, the throttle valve device in the present embodiment is a throttle valve device for a four-cylinder engine having four intake passages, for example. The throttle valve device 10 for a four-cylinder engine includes two intake passages 14 in two throttle bodies 12, and the two throttle bodies 12 are connected by connecting means 16. The two throttle bodies 12 include a left first throttle body 12X and a right second throttle body 12Y in FIGS. The throttle valve device 10 may be constituted by a single throttle body instead of a plurality of throttle bodies connected by the connecting means 16. The throttle valve device to which the present invention can be applied is not limited to a throttle valve device for a four-cylinder engine (the number of intake passages 14 is not limited to four).

  Each intake passage 14 formed in the throttle body 12 includes a downstream intake passage portion 18, an upstream intake passage portion 20, and a communication passage portion that connects the downstream intake passage portion 18 and the upstream intake passage portion 20. 22. The upstream intake passage portion 20 communicates with an air cleaner (not shown), and the downstream intake passage portion 18 communicates with each cylinder (not shown) of the engine. A main throttle shaft 24 that is rotated by a driver's accelerator operation is rotatably attached to a position corresponding to the downstream side intake passage portion 18 in the throttle body 12. A main throttle valve 26 for adjusting the intake air flow rate is fixed to the main throttle shaft 24. A sub-throttle shaft 28 is rotatably mounted at a position corresponding to the upstream intake passage portion 20 in the throttle body 12. A sub-throttle valve 30 for opening and closing the upstream intake passage portion 20 is fixed to the sub-throttle shaft 28. The diameter of the sub throttle valve 30 is larger than that of the main throttle valve 30, and the inner diameter of the upstream intake passage portion 20 is larger than the inner diameter of the downstream intake passage portion 18.

  In the throttle valve device 10 of the present embodiment, two intake passages 14 are provided in parallel in two throttle bodies 12 (first throttle body 12X and second throttle body 12Y) arranged in parallel. . Each intake passage 14 will be described as a first intake passage 14A, a second intake passage 14B, a third intake passage 14C, and a fourth intake passage 14D from the left to the right in FIGS. The first intake passage 14A includes a first upstream intake passage portion 20A, a first communication passage portion 22A, and a first downstream intake passage portion 18A. Similarly, the second intake passage 14B includes a second upstream intake passage portion 20B, a second communication passage portion 22B, and a second downstream intake passage portion 18B. The third intake passage 14C includes a third upstream intake passage portion 20C, a third communication passage portion 22C, and a third downstream intake passage portion 18C. The fourth intake passage 14D includes a fourth upstream intake passage portion 20D, a fourth communication passage portion 22D, and a fourth downstream intake passage portion 18D. Further, the upstream side portion of each throttle body 12 at a position corresponding to each upstream side intake passage portion 20A, 20B, 20C, 20D is directed from the left to the right in FIG. The upstream side portion 12B, the third upstream side portion 12C, and the fourth upstream side portion 12D are used.

  In the first intake passage 14A at the left end of FIGS. 1 and 3, assuming that the central axis of the first upstream intake passage portion 20A is AO1-AO1, and the central axis of the first downstream intake passage portion 18A is AO2-AO2, Although the central axis AO1-AO1 and the central axis AO2-AO2 are parallel, the central axis AO1-AO1 and the central axis AO2-AO2 are disposed at eccentric positions. That is, the central axis AO1-AO1 of the first upstream intake passage portion 20A has a structure that is eccentric to the inside (near the center) of the throttle body 12 (12X), and the wall surface at the left end of the first upstream side portion 12A. Can be arranged eccentrically toward the second upstream side portion 12B. At this time, in order not to affect the intake performance, it is preferable to set the eccentric width to 4 mm or less.

  Further, in the fourth intake passage 14D at the right end of FIGS. 1 and 3, the central axis of the fourth upstream intake passage portion 20D is DO1-DO1, and the central axis of the fourth downstream intake passage portion 18D is DO2-DO2. Then, although center axis DO1-DO1 and center axis DO2-DO2 are parallel, center axis DO1-DO1 and center axis DO2-DO2 are arrange | positioned in the eccentric position. In other words, the central axis DO1-DO1 of the fourth upstream intake passage portion 20D has a structure that is eccentric to the inside (near the center) of the throttle body 12 (12Y), and the right end wall surface of the fourth upstream side portion 12D. Can be eccentrically arranged near the third upstream side portion 12C. For the same reason as described above, it is preferable that the eccentric width is set to 4 mm or less.

  On the other hand, in the second intake passage 14B second from the left in FIGS. 1 and 3, the central axis of the second upstream intake passage portion 20B is BO1-BO1, and the central axis of the second downstream intake passage portion 18B is BO2. Assuming −BO2, the central axis BO1-BO1 and the central axis BO2-BO2 are parallel, but the central axis BO1-BO1 and the central axis BO2-BO2 are arranged at eccentric positions. That is, the central axis BO1-BO1 of the second upstream intake passage portion 20B is disposed at a position close to the central axis AO1-AO1 of the first upstream intake passage portion 20A (near the center of the throttle body 12X). As a result, the second upstream side portion 12B has a structure eccentric to the first upstream side portion 12A, and the outer outer wall of the second upstream side portion 12B is located on the inner side of the conventional one (near the center of the throttle body 12X). (L2). In other words, the position of the central axis BO1-BO1 of the second upstream intake passage portion 20B is arranged on the side farther from the connecting means 16 than the position of the central axis BO2-BO2 of the second downstream intake passage portion 18B. Is done. At this time, in order not to affect the intake performance, it is preferable to set the eccentric width to 4 mm or less.

  Further, in the second intake passage 14C second from the right in FIGS. 1 and 3, the central axis of the third upstream intake passage portion 20C is CO1-CO1, and the central axis of the third downstream intake passage portion 18C is CO2. Assuming −CO2, the central axis CO1-CO1 and the central axis CO2-CO2 are parallel, but the central axis CO1-CO1 and the central axis CO2-CO2 are arranged at eccentric positions. That is, the central axis CO1-CO1 of the third upstream intake passage portion 20C is disposed at a position on the central axis DO1-DO1 side (near the center of the throttle body 12Y) of the fourth upstream intake passage portion 20D. As a result, the third upstream side portion 12C has a structure eccentric to the fourth upstream side portion 12D, and the outer outer wall of the third upstream side portion 12C is located on the inner side of the conventional one (near the center of the throttle body 12Y). (L3). In other words, the position of the central axis CO1-CO1 of the third upstream intake passage portion 20C is arranged on the side farther from the connecting means 16 than the position of the central axis CO2-CO2 of the third downstream intake passage portion 18C. Is done. For the same reason as described above, it is preferable that the eccentric width is set to 4 mm or less.

At this time, a taper is formed on the inner wall of the communication passage portion 22 due to the inner diameter difference between the downstream side intake passage portion 18 and the upstream side intake passage portion 20. In particular, in this embodiment, the taper on the center position side is formed larger than the taper on the outer position side of the throttle body 12. The taper is preferably formed on both sides of the inner wall of the communication passage portion 22 as in this embodiment. By forming the taper on both sides of the inner wall in this way, one taper (for example, the taper on the central position side) is prevented from becoming excessive, the flow resistance is suppressed, and the main throttle valve 26 and the sub throttle valve 30 are connected. Interference with the communication passage portion 22 can be prevented. In the present embodiment, the taper is formed on both sides of the inner wall for the above reasons. However, depending on the case, the taper is formed only on the inner side (center position side) of the connecting passage portion 22 and the outer position side is flat. But you can.
Further, since the communication passage portion 22 has a tapered shape, as shown in FIG. 2, the inner wall 32 of the downstream-side intake passage portion 18 is formed of the inner wall 34 of the upstream-side intake passage portion 20 in a cross-sectional view orthogonal to the axial direction. It will be located inside. With this configuration, the flow resistance can be suppressed, and a smooth air flow can be realized.

  On the other hand, if the emphasis is on preventing interference between the sub-throttle valve 30 and the inner wall of the communication passage portion 22, the position of the sub-throttle shaft 28 of the sub-throttle valve 30 of the upstream side intake passage portion 20 on the downstream side. A uniform diameter region in which the diameter of the upstream intake passage portion 20 is constant may be formed. In the present embodiment, this equal area is about the radius of the sub-throttle valve 30, but if the equal area is made wider, the taper of the communication passage portion 22 becomes tighter. In some cases, interference between the sub-throttle valve 30 and the inner wall of the communication passage portion 22 can be more preferably prevented.

  As shown in FIG. 2, in this embodiment, the central axis (AO1, BO1, CO1, DO1) of the upstream intake passage portion 20 (20A, 20B, 20C, 20D) is connected to the downstream intake passage portion 18 ( 18A, 18B, 18C, 18D) are eccentric in parallel along the main throttle shaft 24 of the main throttle valve 26. Therefore, the main throttle shaft 24 of the main throttle valve 26 arranged in the downstream side intake passage portion 18 (18A, 18B, 18C, 18D) and the central axis (AO2) of the downstream side intake passage portion 18 (18A, 18B, 18C, 18D). , BO2, CO2, DO2), the central axis (AO1, BO1, CO1, DO1) of the upstream intake passage portion 20 (20A, 20B, 20C, 20D) is positioned. With this configuration, the central axis (AO1, BO1, CO1, DO1) of the upstream intake passage portion 20 (20A, 20B, 20C, 20D) is eccentric in the direction of the main throttle shaft 24. 24 is not eccentric in the direction perpendicular to 24, and therefore, the upstream intake passage portion 20 (20A, 20B, 20C, 20D) and the downstream intake passage portion 18 (18A, 18B, 18C, 18D) are prevented from shaking. In addition, the flow resistance can be suppressed. As shown in FIG. 2, the intake passage has a circular cross section, but may be formed in a non-circular shape such as an elliptical shape or an oval shape.

Here, the throttle valve device 10 for a four-cylinder engine of the present invention and the conventional throttle valve device 110 for a four-cylinder engine will be compared based on FIG.
As shown in FIG. 3, when the central axis of the downstream intake passage portion 124 in the conventional throttle valve device 110 is OO, the central axis AO2-AO2 of the first downstream intake passage portion 18A of the present invention is The conventional downstream side intake passage portion 124 is disposed at the same position as the central axis OO (the position of the opening on the downstream side of the intake passage of the throttle body is the same). Further, the central axes BO2-BO2, CO2-CO2, DO2-DO2 of the other three downstream intake passage portions 18B, 18C, 18D are the same as the central axis OO of the conventional downstream intake passage portion 124, respectively. Place in position.

  In the present invention, the center axis AO1-AO1 of the upstream intake passage portion 20A of the first intake passage 14A is eccentric toward the center (closer to the second upstream side portion 12B), whereby the outer side of the first upstream side portion 12A. The outer wall can be displaced (L1) inward (closer to the center) than the conventional one. Similarly, the outer outer wall of the fourth upstream side portion 12D is formed by decentering the central axis DO1-DO1 of the upstream side intake passage portion 20D of the fourth intake passage 14D toward the center (near the third upstream side portion 12C). Can be displaced (L4) to the inner side (center side) than the conventional one. Accordingly, the lateral width of the entire throttle body 12 can be reduced without reducing the cross-sectional area of the intake passage 14, and the throttle valve device 10 itself can be downsized.

  Further, as in the present embodiment, when one throttle body 12 is configured by connecting the plurality of throttle bodies 12X and 12Y with the connecting means 16, the upstream side portion 12B disposed with the connecting means 16 interposed therebetween. , 12C can be opened. That is, the second upstream side portion 12B and the third upstream side portion 12C are decentered toward the centers of the throttle bodies 12X and 12Y, respectively, so that the space between the second upstream side portion 12B and the third upstream side portion 12C ( The space at the position where the connecting means 16 is provided can be expanded (L2 and L3 in FIG. 3). As a result, the degree of freedom in layout can be increased.

  Thus, the inter-axis distance (between AO1 and BO1 or between CO1 and DO1) between the central axes of the upstream intake passage portions 20 in the adjacent intake passages corresponds to the central axis of the adjacent downstream intake passage portion 18 correspondingly. It is narrower than the distance between the axes (between AO2 and BO2 or between CO2 and DO2). By narrowing the distance between the central axes of the upstream intake passage portions 20 having a large diameter, the overall widths of the throttle bodies 12X and 12Y, and thus the throttle valve device 10 as a whole can be reduced in size. In particular, the throttle valve device 10 can be reduced in size by adjusting the position of the central axis of the upstream intake passage portion 20 even when the distance between the downstream intake passage portions 18 is predetermined by the cylinder design. can do.

  In this embodiment, in the throttle valve device for a four-cylinder engine, two throttle bodies are provided with two intake passages each, and the two throttle bodies are connected by connecting means. In the arranged intake passages (intake passages 14A, 14D), the axial centers (center axes AO1-AO1, DO1-DO1) of the upstream intake passage portions (upstream intake passage portions 20A, 20D) are decentered toward the central position. In addition, in the intake passages (intake passages 14B, 14C) arranged at positions adjacent to the connecting means, the axial center (center axis BO1-BO1, CO1-) of the upstream intake passage portion (upstream intake passage portions 20A, 20D). Although the configuration in which CO1) is eccentrically arranged on the side away from the connecting means has been described, the embodiment of the present invention is not limited to this.

For example, as shown in FIG. 4, two throttle bodies 12 (12X, 12Y) each have two intake passages 14 and the four throttle bodies 12 are connected by connecting means 16 in a four cylinder. In the throttle valve device 10 for the engine, the central axes AO1 and DO1 of the intake passages 14A and 14D arranged outside are kept as they are, and the intake air on the upstream side only in the intake passages 14B and 14C arranged at positions adjacent to the connecting means 16 The configuration may be such that the central axes BO1 and CO1 of the passage portions 20B and 20C are eccentric to the side away from the connecting means 16 (inside the throttle bodies 12X and 12Y).
Here, the connecting means 16 has been described as an example of a component disposed at a position adjacent to the intake passage 14, but the adjacent member is not limited to this, and for example, a drive mechanism for driving a throttle shaft, a shaft The same applies to detection means for detecting the amount of angular displacement. These adjacent members can be prevented from interfering with the upstream side intake passage, and the space can be expanded. As a result, the degree of freedom in layout can be increased.

In addition, although not shown, in a throttle valve device for a two-cylinder engine having two intake passages in one throttle body, the central axis of the upstream intake passage portion in each intake passage is provided. It may be configured to be eccentric in the center position direction. Further, in a throttle valve device for a three-cylinder engine provided with three intake passages in one throttle body, the central axis of the upstream intake passage portion is decentered in the central position direction in the two intake passages outside the two intake passages. The structure to be made may be sufficient. Further, in a throttle valve device for a four-cylinder engine in which one throttle body is provided with four intake passages, the central axis of the upstream intake passage portion is decentered toward the central position in the two intake passages on the outer sides thereof. The structure to be made may be sufficient.

Furthermore, as shown in FIG. 5, a throttle body 12 for a single cylinder engine may be used. In this case, by decentering the central axis O2 of the small-diameter downstream side intake passage portion 18 to one side, a space can be formed by the amount eccentric to the side opposite to the eccentric side. The space can be effectively utilized by arranging other parts. Further, if the space is used to reinforce the throttle body 12 itself, the rigidity or connection strength of the throttle body 12 can be improved.
Further, as shown in FIG. 6, the present invention can be applied to the throttle valve device 10 in which the upstream side intake passage portion 20 is not provided with the sub-throttle valve 30 and only the downstream side intake passage portion 18 is provided with the main throttle valve 24. In this case as well, the central axis (AO1, BO1, CO1, DO1) of the upstream intake passage portion 20 and the central axis (AO2, BO2, CO2, DO2) of the downstream intake passage portion 18 are shifted as in the above-described embodiment. As a result, the entire throttle body 12 can be reduced in size without making the intake passage 14 narrower, and an effective space can be generated around the throttle body 12.
Since other configurations and effects relating to these are the same as those of the above-described embodiment, detailed description thereof is omitted here.

As an application example of the present invention, as shown in FIG. 7, a simple intake passage 14 that does not include the sub throttle valve 30 in the upstream intake passage portion 20 and does not include the main throttle valve 24 in the downstream intake passage portion 18. The configuration of the present invention can also be applied to the (intake passage device 40).
The intake passage device 40 according to the present embodiment is an intake passage device 40 having a plurality of (here, two) intake passages 14 (14A, 14B) in one body 12 as shown in FIG. However, the present invention is not limited to this, and an intake passage device or the like (not shown) provided with one intake passage in one body may be used.

In this case, the intake passage device 40 in this embodiment includes the downstream intake passage portion 18, the upstream intake passage portion 20 having a diameter larger than that of the downstream intake passage portion 18, the downstream intake passage portion 18, and the upstream intake air. An intake passage 14 that communicates with the passage portion 20 and is formed from a tapered communication passage portion 22 is provided in the body 12, and the central axis O1-O1 of the upstream intake passage portion 20 and the downstream intake passage are provided. The central axis O2-O2 of the portion 18 is arranged in parallel, and one central axis (O1-O1 or O2-O2) is in the axial direction with respect to the other central axis (O1-O1 or O2-O2). It is characterized by being eccentric in the orthogonal direction.
Further, the intake passage device 40 is configured such that the inner wall of the downstream intake passage portion 18 is positioned inside the inner wall of the upstream passage portion 20 in a cross-sectional view orthogonal to the central axis (O1-O1 and O2-O2). It is a feature.
Further, the intake passage device 40 sucks adjacent members (for example, a drive mechanism for driving the throttle shaft, detection means for detecting the shaft angular displacement, or a connecting member for connecting the throttle bodies). It may be disposed at a position adjacent to the passage 14 and the center axis O1-O1 of the upstream intake passage portion 20 in the intake passage 14 may be eccentric to the side opposite to the side where the adjacent member is disposed.
Further, the intake passage device 40 may include a plurality of intake passages 14 in the body 12 (for example, two as shown in FIG. 7). When a plurality of intake passages 14 are provided in the body 12, the intake passage device 40 uses the central axis (AO1-AO1 and / or BO1-BO1) of the upstream intake passage portion 20 as the downstream intake passage portion 18. The center axis (AO2-AO2 and / or BO2-BO2) of the body 12 may be eccentric to the center position direction side. Further, the intake passage device 40 corresponds to the distance between the central axes AO1-AO1, BO1-BO1 of the upstream intake passage portions 20A, 20B in the adjacent intake passages 14A, 14B corresponding to the adjacent downstream intake air. You may make narrower than the center distance of center axis | shaft AO2-AO2, BO2-BO2 of channel | path part 18A, 18B.

The effect of this embodiment (intake passage device 40) is the same as that of the above-described embodiment (throttle valve device 10).
That is, according to the intake passage device 40 according to the present embodiment, one of the central axes (O1-O1 or O2) of the downstream intake passage portion 18 and the upstream intake passage portion 20 that are conventionally located on the same axis. -O2) is shifted in the direction orthogonal to the other central axis (O1-O1 or O2-O2) to reduce the size of the entire intake passage device 40 without narrowing the inside of the intake passage 14 Or a space (space) that can be effectively used around the intake passage device 40 can be created. For example, if the central axis O2-O2 of the downstream side intake passage portion 18 is displaced, a space can be formed by the amount displaced to the side opposite to the displaced side, and other spaces can be formed in the space. It can be used effectively by arranging parts. Further, if the space 12 is used to reinforce the body 12 itself, the rigidity or connection strength of the body 12 can be improved. In particular, if the inner wall of the downstream intake passage portion 18 is positioned inside the inner wall of the upstream intake passage portion 20 in a cross-sectional view orthogonal to the central axis (O1-O1 and O2-O2), the diameter is small. The downstream intake passage portion 18 does not protrude outward in the radial direction of the large upstream intake passage portion 20, and the entire intake passage device 40 can be downsized.
At this time, since the downstream side intake passage portion 18 and the upstream side intake passage portion 20 are connected to each other by the tapered communication passage portion 22, the flow path resistance in the communication passage portion 22 can be suppressed. In consideration of the influence on the intake performance, the displacement width is preferably 4 mm or less. In this way, the overall size can be reduced without reducing the cross-sectional area of the intake passage 14 (without reducing the intake efficiency), so that the passage area when fully opened can be ensured in the same manner as in the past, and the intake performance is hindered. There is nothing.
Further, the adjacent member is disposed at a position adjacent to the intake passage 14, and the central axis O1-O1 of the upstream intake passage portion 20 in the intake passage 14 is opposite to the side where the adjacent member is disposed (from the position of the adjacent member). By deviating in the direction of separating, it is possible to narrow the space between the upstream intake passage portions 20 while preventing adjacent members from interfering with the upstream intake passage portions 20. In particular, since a space can be generated at the position where the adjacent member is disposed, the degree of freedom in layout can be increased. For example, if it is an intake passage device (not shown) for a four-cylinder engine in which two intake passage devices 40 having two intake passages 14 shown in FIG. 7 are connected using connecting members (adjacent members), By displacing the central axis O1-O1 of each upstream intake passage portion 20 of each body 12 inwardly of the central axis O2-O2 of the downstream intake passage portion 18, between the upstream side portions of each body 12 There is a space in the space, and the free space can be used effectively.
In particular, in an intake passage device 40 having a plurality of (here, two) intake passages 14 (14A, 14B) in one body 12 as shown in FIG. 7, the downstream intake passage portions 18A, 18B and the upstream By shifting the central axis (AO1-AO1, BO1-BO1) of the large-diameter upstream intake passage portion 20A, 20B of the side intake passage portions 20A, 20B toward the center of the intake passage device 40, the body 12 The overall width of the intake passage device 40 can be reduced. At this time, the inter-axis distance between the central axes AO1-AO1 and BO1-BO1 of the upstream intake passage portions 20A and 20B in the adjacent intake passages 14A and 14B is set to the corresponding downstream intake passage portions 18A and 18B. If the distance between the center axes AO2-AO2 and BO2-BO2 is made smaller than the distance between the axes, the body 12 can be reduced in size even when the distance between the downstream intake passage portions 18A and 18B is determined in advance by the cylinder design. it can.
In addition, since the other structure and effect which concern on a present Example are the same as that of the Example (throttle valve apparatus 10) mentioned above, detailed description here is abbreviate | omitted.

With the throttle valve device according to the present invention, the entire width of the throttle body can be reduced by reducing the entire width of the throttle body without reducing the intake efficiency, and a space that can be effectively used around the throttle body can be generated. Therefore, for example, it is optimal as a throttle valve device for a multi-cylinder engine in a two-wheeled vehicle such as a motorcycle having a small accommodation space.
In particular, when the throttle valve device according to the present invention is mounted on a motorcycle such as a motorcycle, if the direction in which the central axis is decentered is set in the vehicle width direction of the motorcycle, space saving in the vehicle width direction can be achieved. This is very preferable because it has the effect of facilitating the layout of other components.

DESCRIPTION OF SYMBOLS 10 Throttle valve apparatus 12 Throttle body 14 Intake passage 16 Connecting means 18 Downstream intake passage portion 20 Upstream intake passage portion 22 Connection passage portion 24 Main throttle shaft 26 Main throttle valve 28 Sub throttle shaft 30 Sub throttle valve

Claims (10)

The downstream intake passage portion, the upstream intake passage portion having a diameter larger than that of the downstream intake passage portion, and the downstream intake passage portion and the upstream intake passage portion are connected to each other, and are tapered communication passages. In a throttle valve device comprising an intake passage formed in a throttle body in a throttle body, wherein a throttle valve is arranged in at least one of the downstream intake passage portion or the upstream intake passage portion of the intake passage,
The central axis of the upstream intake passage portion and the central axis of the downstream intake passage portion are arranged in parallel,
A throttle valve characterized in that one central axis is decentered from a state where it is at the same position as the other central axis in a direction orthogonal to the axial direction and extending in a direction in which the shaft axis of the throttle valve extends. apparatus.   2. The throttle valve device according to claim 1, wherein an inner wall of the downstream intake passage portion is located inside an inner wall of the upstream intake passage portion in a cross-sectional view orthogonal to the central axis. A main throttle shaft with a main throttle valve disposed on the downstream side intake passage portion, and a sub throttle shaft Ru extending in the same direction as the main throttle shaft comprises a sub-throttle valve disposed on the upstream side intake passage portion has, according to claim 2, characterized in that said central axis of the upstream intake passage portion parallel to the eccentric and the downstream intake passage portion center axis of the same shaft state to pre SL main slot Cie Yafuto axis The throttle valve device described in 1.   An adjacent member disposed outside the throttle body and connected to the throttle shaft is disposed at a position adjacent to the intake passage, and the adjacent member is disposed as a central axis of the upstream intake passage portion in the intake passage. The throttle valve device according to claim 2, wherein the throttle valve device is eccentric to a side opposite to the side.   A central axis of the upstream side intake passage portion in at least one of the plurality of intake passages provided in the throttle body is set to a center axis of the throttle body with respect to a central axis of the downstream side intake passage portion. The throttle valve device according to any one of claims 2 to 4, wherein the throttle valve device is eccentric toward a center position direction side.   3. The throttle according to claim 2, wherein two intake passages are provided in the throttle body, and center axes of the two upstream intake passage portions are eccentric to the inner side in the parallel direction of the intake passage. Valve device.   The connecting member that connects the throttle bodies is disposed at a position adjacent to the intake passage, and the central axis of the upstream intake passage portion in the intake passage is eccentric to the side opposite to the side where the connecting member is disposed. The throttle valve device according to claim 1 or 2, wherein   The throttle valve device according to any one of claims 1 to 7, wherein a main throttle valve is provided in the downstream side intake passage portion, and a sub throttle valve is provided in the upstream side intake passage portion.   9. The throttle according to claim 8, wherein a diameter equalizing region in which the diameter of the upstream intake passage portion is constant is formed downstream of a shaft shaft position of the throttle valve disposed in the upstream intake passage portion. Valve device. Wherein the communicating passage portion forms a taper on the inner wall surfaces of, according to claim 5, characterized in that the axially outer taper of the throttle valve shaft is made smaller than the taper of the axial center side of the throttle valve shaft Throttle valve device.

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