JP2009191996A - Vehicle transmission - Google Patents

Abstract

An object of the present invention is to provide a vehicular transmission capable of reducing gas accumulated in an oil chamber of a hydraulic actuator in a vehicular transmission in which a shift is controlled by supplying hydraulic oil to the oil chamber.
Since a means for reducing the volume of a space in which gas is accumulated from hydraulic oil is provided in a hydraulic pressure detection hole that communicates with the oil chamber, the volume of the space is reduced and the amount of gas accumulated is reduced. . As a result, the influence of the compression of the gas is reduced, and a decrease in hydraulic response at the time of shifting and the occurrence of a shift shock are reduced.
[Selection] Figure 6

Description

  The present invention relates to a vehicular transmission in which a shift is controlled by supplying hydraulic oil to an oil chamber, and more particularly to an improvement in the shifting performance of the vehicular transmission.

  2. Description of the Related Art A vehicular transmission in which a shift is controlled by supplying hydraulic oil to an oil chamber is well known. The hydraulic oil is regulated by a linear solenoid valve, for example, and supplied to the oil chamber as a drive source for a hydraulic actuator such as a clutch or a brake in the transmission. In such a vehicle transmission, the oil pressure in the oil chamber may be detected for initial control of hydraulic control parts such as a linear solenoid valve at the time of factory shipment or for investigation when the transmission fails. A hydraulic pressure sensor is attached to a hydraulic pressure detection hole that communicates with the hydraulic pressure to detect the hydraulic pressure. For example, the pressure sensor mounting structure for an automatic transmission of Patent Document 1 is an example. Patent Document 1 discloses a technique in which an intermediate portion is formed between a fitting portion into which a hydraulic sensor is fitted and a first hydraulic oil passage, and a plug having an orifice is fitted in the intermediate portion. . By doing in this way, it is not necessary to carry out orifice processing to the transmission case, and the manufacturing cost is suppressed.

JP 2007-192390 A

  By the way, in the pressure sensor mounting structure for automatic transmission of Patent Document 1, an intermediate portion is formed between the fitting portion into which the hydraulic sensor is fitted and the first hydraulic oil passage. If the gas accumulates, the hydraulic pressure is not adjusted in accordance with the command pressure of the electronic control device during the shift due to the compression of the gas, and the response of the shift may be reduced or a shift shock may occur. Therefore, it is necessary to reduce the gas accumulated in the intermediate portion.

  The present invention has been made in the background of the above circumstances, and an object of the present invention is to provide an oil for a hydraulic actuator in a vehicle transmission in which a shift is controlled by supplying hydraulic oil to an oil chamber. An object of the present invention is to provide a vehicle transmission capable of reducing gas accumulated in a chamber.

  In order to achieve the above object, the subject matter of the invention according to claim 1 is a means for reducing a volume of a space in which gas is accumulated in a transmission in which a shift is controlled by supplying hydraulic oil to an oil chamber. Is provided in the oil chamber.

  According to a second aspect of the present invention, in the vehicle transmission according to the first aspect, the means for reducing the volume of the space communicates with the oil chamber formed so that a hydraulic sensor can be attached. It is provided in the oil pressure detection hole.

  According to a third aspect of the present invention, in the vehicle transmission according to the second aspect, the means for narrowing the volume of the space is a shaft portion of a bolt for oil-tightly closing the hydraulic pressure detection hole. It is characterized by having a longer length.

  According to a fourth aspect of the present invention, in the vehicle transmission according to the second aspect, the means for narrowing the volume of the space includes a spacer inserted in the hydraulic pressure detection hole. Features.

  According to a fifth aspect of the present invention, there is provided the vehicle transmission according to the fourth aspect, wherein in the spacer, the oil can be distributed to the hydraulic sensor attached to the oil pressure detection hole. A hole is formed.

  According to a sixth aspect of the present invention, in the vehicle transmission according to the fourth aspect, the spacer is a member formed in a columnar shape by winding a belt-shaped member. To do.

  According to a seventh aspect of the present invention, in the vehicle transmission according to the fourth aspect, the spacer is a columnar member having a cross section formed in a lattice shape.

  According to the vehicle transmission of the first aspect of the invention, since the oil chamber is provided with means for reducing the volume of the space in which the gas accumulates, the volume of the space is reduced and the amount of gas accumulation is reduced. Thereby, the influence by compression of gas is reduced and the fall of the hydraulic response at the time of a gear shift and generation | occurrence | production of a gear shift shock can be reduced.

  According to the vehicular transmission of the invention according to claim 2, the means for reducing the volume of the space is provided in a hydraulic pressure detection hole communicating with the oil chamber formed so that a hydraulic pressure sensor is attached. Therefore, the volume of the space formed in the oil pressure detection hole is narrowed, so that the amount of gas accumulation can be effectively reduced.

  According to the vehicle transmission of the invention of claim 3, the means for narrowing the volume of the space is obtained by increasing the length of the shaft portion of the bolt for oil-tightly closing the oil pressure detection hole. For this reason, the volume of the space is narrowed by the shaft portion of the bolt, and the amount of gas accumulation is reduced.

  According to the fourth aspect of the present invention, the means for reducing the volume of the space is a means for inserting a spacer into the oil pressure detection hole, so that the space in which gas accumulates is narrowed by the spacer. As a result, the amount of gas accumulation is reduced.

  According to the vehicle transmission of the invention of claim 5, since the spacer is formed with an oil circulation hole through which the hydraulic oil can flow to the hydraulic sensor attached to the hydraulic pressure detection hole. The function as the oil pressure detection hole is maintained, and the oil pressure can be detected without removing the spacer even when the pressure sensor needs to be attached to detect the oil pressure.

  According to the vehicle transmission of the invention of claim 6, since the spacer is a member formed in a columnar shape by winding the belt-like member, the space is narrowed by the belt-like member and the gas is The amount of accumulation is reduced. Even when it is necessary to detect the hydraulic pressure by attaching a pressure sensor, the hydraulic oil flows to the hydraulic sensor through the gap formed between the wound belt-like members, so that it functions as a hydraulic pressure detection hole. Is maintained, and the hydraulic pressure can be detected without removing the spacer.

  According to the vehicle transmission of the invention of claim 7, since the spacer is a columnar member having a cross section formed in a lattice shape, the space is narrowed by the volume occupied by the columnar member, and the gas The amount of accumulation is reduced. Even when it is necessary to detect the oil pressure by attaching a pressure sensor, the hydraulic oil is circulated to the pressure sensor through the gap formed between the grids, so that the function as the oil pressure detection hole is maintained, and the spacer The hydraulic pressure can be detected without removing.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a skeleton diagram illustrating a vehicle drive device 10 to which the present invention is applied. The vehicle drive device 10 is suitably employed in an FF (front engine / front drive) type vehicle, and includes an engine 12 as a driving source for traveling. The output of the engine 12 composed of an internal combustion engine is output to the left and right drive wheels via a torque converter 14 that functions as a fluid transmission device, an automatic transmission 16 for a vehicle, a differential gear device (not shown), a pair of axles, and the like. It is to be transmitted. Note that the vehicle automatic transmission 16 of the present embodiment corresponds to the vehicle transmission of the present invention.

  The torque converter 14 is connected to the housing case 36 via a pump impeller 14p connected to the crankshaft of the engine 12, a turbine impeller 14t connected to the input shaft 32 of the automatic transmission 16, and a one-way clutch. The stator impeller 14s is provided to transmit power via a fluid. A lockup clutch 38 is provided between the pump impeller 14p and the turbine impeller 14t. When the lockup clutch 38 is engaged, the pump impeller 14p and the turbine impeller 14t are integrated. It can be rotated to.

  The vehicular automatic transmission 16 includes a first transmission unit 24 mainly composed of a single pinion type first planetary gear unit 22, a single pinion type second planetary gear unit 26, and a double pinion type third planetary unit. A second transmission unit 30 mainly composed of the gear device 28 is provided on the coaxial line, and the rotation of the input shaft 32 is shifted and output from the output gear 34. The input shaft 32 corresponds to an input member, is a turbine shaft that is rotated integrally with the turbine impeller 14t of the torque converter 14, and the output gear 34 corresponds to an output member. The right and left drive wheels are driven to rotate by meshing with the differential gear device via a shaft or directly. The vehicle automatic transmission 16 and the torque converter 14 are substantially symmetrical with respect to the center line, and the lower half of the center line is omitted in FIG.

  The first planetary gear unit 22 constituting the first transmission unit 24 includes three rotating elements, a sun gear S1, a carrier CA1, and a ring gear R1, and the sun gear S1 is connected to the input shaft 32 for rotational driving. And the ring gear R1 is selectively coupled to the housing case 36, which is a non-rotating member, via the third brake B3, whereby the carrier CA1 is rotated at a reduced speed with respect to the input shaft 32 as an intermediate output member. Output. Further, the second planetary gear device 26 and the third planetary gear device 28 constituting the second transmission unit 30 are partially connected to each other to constitute four rotating elements RM1 to RM4. Specifically, the first rotating element RM1 is constituted by the sun gear S3 of the third planetary gear device 28, and the ring gear R2 of the second planetary gear device 26 and the ring gear R3 of the third planetary gear device 28 are connected to each other to perform the second rotation. The element RM2 is configured, and the carrier CA2 of the second planetary gear unit 26 and the carrier CA3 of the third planetary gear unit 28 are coupled to each other to configure the third rotating element RM3. A four-rotation element RM4 is configured. In the second planetary gear device 26 and the third planetary gear device 28, the carrier CA2 and the carrier CA3 are constituted by a common member, the ring gear R2 and the ring gear R3 are constituted by a common member, and The pinion gear of the two planetary gear unit 26 is a Ravigneaux type planetary gear train that also serves as the second pinion gear of the third planetary gear unit 28.

  The first rotation element RM1 (sun gear S3) is selectively connected to the housing case 36 by the brake B1 and stopped rotating, and the second rotation element RM2 (ring gears R2, R3) is selectively housing by the second brake B2. The fourth rotation element RM4 (sun gear S2) is selectively connected to the input shaft 32 via the first clutch C1, and the second rotation element RM2 (ring gears R2, R3) is connected to the case 36 and stopped. Is selectively connected to the input shaft 32 via the second clutch C2, and the first rotating element RM1 (sun gear S3) is connected to the carrier CA1 of the first planetary gear unit 22 which is an intermediate output member, and the third rotating element RM3 (carriers CA2, CA3) is integrally connected to the output gear 34 to output rotation. The first to third brakes B1 to B3, the first clutch C1, and the second clutch C2 are all multi-plate hydraulic friction engagement devices that are frictionally engaged by a hydraulic cylinder. These hydraulic friction engagement devices Shifting is controlled by supplying hydraulic oil to the oil chamber. That is, by switching the disengagement state of these brakes and clutches, the respective forward speeds of 6 forward speeds and 1 reverse speed are established.

  The operation table of FIG. 2 collectively shows the relationship between the operation states of the clutch and the brake and the respective shift stages, and “◯” represents engagement. In the vehicle automatic transmission 16 according to the present embodiment, a forward six-stage multi-speed transmission is achieved by engaging any two of the two clutches C1 and C2 and the three brakes B1 to B3.

  FIG. 3 is a cross-sectional view of a principal part for explaining in detail the structure of a part of the vehicle automatic transmission 16 to which the present invention is applied.

  As shown in FIG. 3, in the housing case 36, the first planetary gear unit 22 and the third planetary gear arranged around the axis of the input shaft 32 connected to the turbine impeller 14t of the torque converter 14 (not shown). Between the gear device 28, an output gear 34 is disposed rotatably supported by a housing case 36 via a bearing 41.

  On the outer peripheral edge of the ring gear R1 of the first planetary gear device 22, one friction plate 42 constituting the friction engagement element 40, which is a constituent member of the third brake B3, is fitted with a plurality of splines so as to be movable in the axial direction. Are combined. The friction engagement element 40 includes one of a plurality of friction plates 42 and the other plurality of friction plates interposed between the friction plates 42 and spline-fitted to the housing case 36 so as to be movable in the axial direction. 44.

  The third brake B3 includes a friction engagement element 40, a bottomed cylindrical piston 46 that is fitted to the housing case 36 so as to be slidable in the axial direction, and one of the pistons 46 is a friction engagement element 40. And a disc spring 48 that urges the lever in a direction not to press.

  When the hydraulic oil is supplied from the hydraulic oil supply hole 51 to the oil chamber 50 formed by the housing case 36 and the piston 46 in response to an instruction from an electronic control device (not shown), the third brake B3 is driven by the hydraulic pressure of the hydraulic oil. 46 is moved to the friction engagement element 40 side and presses the friction engagement element 40. Here, the snap ring 52 that prevents the frictional engagement element 40 from moving in the axial direction is fitted to the transmission case 36 on the opposite side of the frictional engagement element 40 from the piston 46 side. Three brake B3 is engaged. Further, a lip seal 47 that seals the oil chamber 50 in an oil-tight manner is bonded to the bottom of the piston 46 that is in contact with the oil chamber 50, thereby preventing leakage of hydraulic oil.

  The hydraulic oil supplied to the oil chamber 50 is regulated by a linear solenoid valve (not shown) and supplied from the hydraulic oil supply hole 51. Here, a hydraulic sensor (not shown) for detecting the oil pressure in the oil chamber 50 is attached at the time of factory shipment, for example, when initial adjustment of hydraulic control parts such as a linear solenoid valve or when the vehicle drive device 10 fails. The oil pressure detection hole 54 is formed so as to communicate with the oil chamber 50. FIG. 4 is a sectional view of the oil chamber 50 as seen from the axial direction side. The oil chamber 50 formed in the housing case 36 is formed in an annular shape, and communicates with a hydraulic pressure detection hole 54 formed so as to attach a hydraulic sensor. The oil pressure detection hole 54 is formed with a sensor mounting screw portion 58 for attaching a hydraulic sensor. Normally, the oil pressure detection hole 54 is oil-tightly sealed by a bolt 56 that can be screwed with the sensor mounting screw portion 58. The hydraulic oil is prevented from leaking. Here, when the oil pressure detection hole 54 is sealed with a bolt 56, a space 60 is formed in the oil pressure detection hole 54, and gas such as air easily accumulates therein. It is relatively difficult to remove the gas accumulated in the space 60. When the third brake B3 is operated with the gas accumulated in the space 60, the rise of hydraulic pressure is delayed due to the compression of the gas, and the response of the third brake B3. In other words, there is a possibility that a shift shock occurs due to a decrease in shift performance. In addition, since it is necessary to form the sensor attachment screw part 58 for attaching a hydraulic pressure sensor in the oil pressure detection hole 54, there was a limit in making the hole diameter of the oil pressure detection hole 54 small.

  Therefore, in the present embodiment, means for reducing the volume of the space 60 in which gas accumulates is provided in the oil chamber 50. Specifically, in this embodiment, means for reducing the volume of the space 60 in which the gas accumulates is provided in a hydraulic pressure detection hole 54 that communicates with an oil chamber 50 formed so that a hydraulic sensor (not shown) is attached. Hereinafter, each means for narrowing the volume of the space 60 will be described.

  FIG. 5 is an enlarged view of the periphery of the hydraulic pressure detection hole 54. As an example of a means for reducing the volume of the space 60, the length of the shaft portion 62 of the bolt 56 for oil-tightly closing the hydraulic pressure detection hole 54 is increased. It is a thing. By lengthening the shaft portion 62, the volume of the space 60 is narrowed, and the amount of gas accumulation is reduced. The shaft portion 62 constitutes a means for reducing the volume of the space of the present invention.

  FIG. 6 is a view showing a state in which a spacer 64 is inserted into the oil pressure detection hole 54 as another example of the means for reducing the volume of the space 60. By inserting the spacer 64 into the oil pressure detection hole 54, the volume of the space 60 is reduced and the amount of gas accumulation is reduced. The spacer 64 is made of a material having oil resistance such as a metal, a resin, or a plastic member. The spacer 64 corresponds to a means for reducing the volume of the space of the present invention.

  As an example of the spacer 64, for example, a cylindrical columnar spacer 66 as shown in FIG. 7 is applied. By inserting the cylindrical spacer 66 into the hydraulic pressure detection hole 54, the volume of the space 60 is narrowed, and the amount of gas accumulation is reduced. Further, the cylindrical spacer 66 is formed with a notch 67 on the outer peripheral portion so that the hydraulic oil can flow to the hydraulic pressure sensor. By forming this notch 67, the hydraulic oil in the oil chamber 50 can flow to the tip end of the bolt 56. Here, for example, when an abnormality is detected in the automatic transmission unit 16 and it is necessary to detect the oil pressure in the oil chamber 50 for inspection, the hydraulic oil flows in through the notch 67. The hydraulic pressure can be detected by simply replacing the bolt 56 and the hydraulic pressure sensor without removing the cylindrical spacer 66. The cylindrical spacer 66 of this embodiment corresponds to the spacer of the present invention, that is, the means for reducing the volume of the space, and the notch 67 corresponds to the oil circulation hole of the present invention.

  As another example of the spacer 64, for example, a stepped columnar spacer 68 as shown in FIG. 8 is applied. By inserting the stepped spacer 68 into the hydraulic pressure detection hole 54, the volume of the space 60 is narrowed and the amount of gas accumulation is reduced. Furthermore, since the stepped portion 70 is inserted into the small diameter portion of the hydraulic pressure detection hole 54, the space 60 is further narrowed and the amount of gas accumulation is further reduced. The stepped spacer 68 is formed with a small-diameter oil circulation hole 72 through which hydraulic oil can flow to the hydraulic pressure sensor. As a result, when the hydraulic pressure needs to be detected by the hydraulic pressure sensor, the hydraulic oil reaches the hydraulic pressure sensor through the oil circulation hole 72, so that the function as the hydraulic pressure detection hole is maintained and the stepped spacer 68 is removed. Therefore, the hydraulic pressure can be detected. The stepped spacer 68 of this embodiment corresponds to the spacer of the present invention, that is, means for reducing the volume of the space.

  As another example of the spacer 64, for example, a belt-like spacer 74 formed in a columnar shape by winding a belt-like member as shown in FIG. 9 is applied. The belt-like spacer 74 is formed so as to be wound in a cylindrical shape, and is inserted into the hydraulic pressure detection hole 54. Thereby, the volume of the space 60 is narrowed and the amount of gas accumulation is reduced. Further, since a gap is formed between the wound bands, the hydraulic oil can flow through the gap to the hydraulic sensor. As a result, when it becomes necessary to detect the hydraulic pressure by the pressure sensor, the hydraulic pressure can be detected without removing the strip spacer 74. Note that the belt-like spacer 74 of this embodiment corresponds to the spacer of the present invention, that is, means for reducing the volume of the space.

  As another example of the spacer 64, for example, a cylindrical lattice spacer 76 having a cross section formed in a lattice shape as shown in FIG. 10 is applied. When the grid spacer 76 is inserted into the hydraulic pressure detection hole 54, the volume of the space 60 is narrowed by the grid 78 formed inside, and the amount of gas accumulation is reduced. Further, since a gap is formed between the lattices formed inside, the hydraulic oil can flow through the gap to the hydraulic sensor. As a result, when it is necessary to detect the hydraulic pressure by the pressure sensor, the function as the hydraulic pressure detection hole is maintained, and the hydraulic pressure can be detected without removing the lattice spacer 76. The lattice spacer 76 of this embodiment corresponds to the spacer of the present invention, that is, the means for reducing the volume of the space and the columnar member.

  As described above, according to the present embodiment, since the oil chamber 50 is provided with means for reducing the volume of the space 60 in which gas is accumulated from the hydraulic oil, the volume of the space 60 is reduced and the amount of gas accumulation is reduced. . As a result, the influence of the compression of the gas is reduced, and a decrease in hydraulic response at the time of shifting and the occurrence of a shift shock are reduced.

  Further, according to the present embodiment, the means for reducing the volume of the space 60 is provided in the oil pressure detection hole 54 communicating with the oil chamber 50 formed so that the oil pressure sensor is attached. By reducing the volume of the space 60 formed in 54, the amount of gas accumulation can be effectively reduced. Note that the gas accumulated in the oil pressure detection hole 54 is relatively difficult to escape, and by reducing the gas accumulated in the space 60, it is possible to effectively reduce the decrease in hydraulic response at the time of shifting and the occurrence of a shift shock.

  In addition, according to the present embodiment, the means for reducing the volume of the space 60 is the length of the shaft portion 62 of the bolt 56 for oil-tightly closing the hydraulic pressure detection hole 54. The volume of the space 60 is narrowed by the shaft portion 62, and the amount of gas accumulation is reduced.

  Further, according to the present embodiment, the means for reducing the volume of the space 60 is the one in which the spacer 64 is inserted into the oil pressure detection hole 54. Therefore, since the spacer 64 narrows the space 60 in which the gas is stored, Is reduced.

  Further, according to the present embodiment, the cylindrical spacer 66 is formed with the notch 67 through which hydraulic oil can flow to the hydraulic pressure sensor attached to the hydraulic pressure detection hole 54, so that the function as the hydraulic pressure detection hole is maintained. Even when it is necessary to detect the hydraulic pressure by attaching a pressure sensor, the hydraulic pressure can be detected without removing the cylindrical spacer 66.

  In addition, according to the present embodiment, the spacer 64 is a band-shaped spacer 74 formed in a columnar shape by winding a band-shaped member. Therefore, the space 60 is narrowed by the band-shaped spacer 74 and the amount of gas accumulation is reduced. Is done. Even when it is necessary to detect the hydraulic pressure by attaching a pressure sensor, the hydraulic oil flows to the hydraulic sensor through the gap formed between the strip spacers 74, so that the function as the hydraulic pressure detection hole is maintained. The oil pressure can be detected without removing the belt-like spacer 74.

  Further, according to the present embodiment, the spacer 64 is the lattice-like spacer 76 having a cross-section formed in a lattice shape, so that the space 60 is narrowed by the volume occupied by the lattice-like spacer 76 and the amount of gas accumulation is reduced. The Further, even when it is necessary to detect the hydraulic pressure by attaching the pressure sensor, the hydraulic oil flows to the pressure sensor through the gap formed between the grids 78, so that the function as the hydraulic pressure detection hole is maintained, The hydraulic pressure can be detected without removing the sheet-like spacer 76.

  Further, according to the present embodiment, the spacer 64 is the stepped columnar stepped spacer 68, so the space 60 is narrowed by the volume occupied by the stepped spacer 68, and the amount of gas accumulation is reduced. Further, even when it is necessary to detect the hydraulic pressure by attaching the pressure sensor, the hydraulic oil is circulated to the pressure sensor through the oil circulation hole 72, so that the function as the hydraulic pressure detection hole is maintained, and the stepped spacer 68 is provided. The hydraulic pressure can be detected without removing.

  As mentioned above, although the Example of this invention was described in detail based on drawing, this invention is applied also in another aspect.

  For example, in the above-described embodiment, the present invention is applied to the stepped vehicle automatic transmission 16. However, the structure of the transmission is not limited to the present embodiment, and the present invention may be applied to a different structure. Can be applied. For example, a belt type continuously variable transmission may be used. In other words, the present invention can be applied as long as it has an oil chamber to which a hydraulic sensor for detecting hydraulic pressure is attached.

  In the above-described embodiment, the cylindrical spacer 66 is formed with the notch 67, and the stepped spacer 68 is formed with the oil inflow hole. However, if the hydraulic pressure sensor is not attached again, it is necessarily formed. There is no need.

  In the above-described embodiment, the notch 67 is formed in the outer peripheral portion of the cylindrical spacer 66. However, it is not always necessary to form the notch 67 in the outer peripheral portion. It may be formed. That is, when the hydraulic sensor is attached, it is only necessary to form a flow path through which hydraulic oil can reach the hydraulic sensor, and the shape is not particularly limited.

  In the above-described embodiment, the cylindrical spacer 66, the strip spacer 74, the lattice spacer 76, and the like are applied as the spacer 64. However, the spacer 64 is not limited to these, and for example, a plurality of washer-like members are inserted. For example, the space 60 may be narrowed by other means.

  In the above-described embodiment, the present invention is applied to the third brake B3 of the vehicle automatic transmission 16. However, the present invention is not limited to the third brake B3, and can be applied to other clutches and brakes. .

  The above description is only an embodiment, and the present invention can be implemented in variously modified and improved forms based on the knowledge of those skilled in the art.

1 is a skeleton diagram illustrating a vehicle drive device to which the present invention is applied. 3 is an engagement operation table showing the relationship between the operation states of clutches and brakes and the respective shift speeds. It is principal part sectional drawing explaining the structure of a part of automatic transmission for vehicles to which this invention was applied in detail. It is sectional drawing which looked at the oil chamber from the axial direction side. FIG. 5 is an enlarged view of the periphery of the hydraulic pressure detection hole, and is a diagram in a case where the length of the shaft portion of the bolt is increased as an example of means for reducing the volume of the space. It is a figure which shows the state by which the spacer was inserted in space as an example of the means to narrow the volume of space. It is a figure explaining the structure of a spacer. It is another figure explaining the structure of a spacer. It is another figure explaining the structure of a spacer. It is another figure explaining the structure of a spacer.

Explanation of symbols

  16: Automatic transmission for vehicle (transmission for vehicle) 50: Oil chamber 54: Oil pressure detection hole 56: Bolt 60: Space 62: Shaft 64: Spacer (means for reducing the volume of space) 66: Cylindrical spacer (spacer, 67: Notch (oil circulation hole) 68: Stepped spacer (spacer, means for reducing the volume of space) 72: Oil circulation hole 74: Band-shaped spacer (spacer, means for reducing the volume of space) 76 : Grid-shaped spacer (spacer, cylindrical member, means for narrowing the volume of space)

Claims (7)

In a vehicle transmission in which a shift is controlled by supplying hydraulic oil to an oil chamber,
A vehicle transmission characterized in that the oil chamber is provided with means for reducing the volume of a space in which gas accumulates.   The vehicle transmission according to claim 1, wherein the means for reducing the volume of the space is provided in a hydraulic pressure detection hole that is formed to be attached with a hydraulic pressure sensor and communicates with the oil chamber.   3. The vehicle transmission according to claim 2, wherein the means for reducing the volume of the space is obtained by increasing a length of a shaft portion of a bolt for oil-tightly closing the oil pressure detection hole.   3. The vehicle transmission according to claim 2, wherein the means for reducing the volume of the space includes a spacer inserted in the oil pressure detection hole.   5. The vehicle transmission according to claim 4, wherein the spacer is formed with an oil circulation hole through which the hydraulic oil can flow to the hydraulic sensor attached to the hydraulic pressure detection hole.   5. The vehicle transmission according to claim 4, wherein the spacer is a member formed in a columnar shape by winding a belt-like member.   5. The vehicle transmission according to claim 4, wherein the spacer is a columnar member having a cross section formed in a lattice shape.

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