JP2005048912A - Valve structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve structure that can be easily assembled and can generate a uniform and stable damping force.
SOLUTION: An annular leaf valve 10 is provided with three or more odd-numbered circumferential holes 11 provided at equal intervals in the circumferential direction, and the annular leaf valve 15 is also provided at equal intervals in the circumferential direction. An even number of circumferentially extending long holes 16 and a passage 17 functioning as a choke are provided, a leaf valve 15 is stacked on the leaf valve 10, and the circumferential length of each of the long holes 11, 16 is determined by the leaf valve. 10, the lap area W between the long hole 11 and the long hole 16 is made to be substantially constant, regardless of the circumferential angle of the leaf valve 15 with respect to 10.
[Selection] Figure 2

Description

  The present invention relates to an improvement in a valve structure including a laminated leaf valve.

Conventionally, in a valve structure provided with this kind of laminated leaf valve, for example, there is one that is embodied in a piston part of a shock absorber and a laminated leaf valve is provided at the outlet end of a port provided in the piston part so as to be freely opened and closed. Are known. The laminated leaf valve in this valve structure is composed of an annular first leaf valve that contacts the outlet end of the port and three circles that are laminated on the first leaf valve and provided at equal intervals in the circumferential direction. An annular second leaf valve provided with an arc-shaped elongated hole and a choke communicating with the elongated hole and the outer periphery, and three circles stacked on the second leaf valve and provided at equal intervals in the circumferential direction It is composed of a third leaf valve having an arc-shaped long hole and an annular fourth leaf valve stacked on the third leaf valve. The hydraulic oil in the cylinder passes through the choke, and the fourth leaf valve is bent to generate a damping force. If the piston speed is high when the shock absorber expands and contracts, all the leaf valves are bent and attenuated. Power It is possible to live. That is, in this valve structure, a damping force proportional to the piston speed can be generated (see, for example, Patent Document 1).
JP 2001-165224 A (paragraph numbers 0039 to 0040, FIGS. 1 and 4)

  However, in the valve structure as described above, it may be pointed out that there is a possibility of causing the following problems.

  In other words, in the conventional valve structure, three arc-shaped elongated holes provided in the second leaf valve and the third leaf valve are provided at equal intervals in the circumferential direction. When assembling the piston portion, it is desirable that the arc-shaped elongated holes face each other, but there may be a positional shift.

  Then, the area where the arc-shaped long holes wrap changes, but the generated damping force changes depending on the wrap area. Therefore, the assembly work of each leaf valve requires carefulness.

  In addition, when the position shift occurs, the generated damping force changes, so there is a problem that the quality of the shock absorber is not constant.

  Therefore, the present invention has been developed to improve the above-mentioned problems, and an object of the present invention is to provide a valve structure that can be easily assembled and can generate a uniform and stable damping force. It is.

  In order to solve the above-described object, the valve structure of the first problem solving means of the present invention is provided with a laminated leaf valve provided at the downstream end of the flow path, which opens and closes the downstream end of the flow path. In a valve structure that generates a predetermined damping force when passing, the valve structure is a plurality of at least one annular structure having an odd number of elongated holes, which are plural along the circumferential direction provided at equal intervals in the circumferential direction. A leaf valve having a leaf valve and at least one annular leaf valve having an even number of long holes along the circumferential direction provided at equal intervals in the circumferential direction, and having an odd number of long holes For the leaf valve with an even number of long holes, the leaf valve with an odd number of long holes is stacked for the leaf valve with an even number of long holes, and the downstream end of the flow path The leaf valve farthest from A choke that communicates between the outer periphery of each leaf and each elongated hole is provided, and the circumferential length of each elongated hole of the adjacent leaf valve is adjacent to each other regardless of the circumferential angle of each leaf valve. The wrap area between the long holes of the leaf valve is set to be substantially constant.

  Further, the valve structure in the second problem solving means includes a laminated leaf valve that is provided at the downstream end of the flow path and opens and closes the downstream end of the flow path, and generates a predetermined damping force when the working fluid passes. In the structure, the valve structure includes a first leaf valve that contacts the downstream end of the flow path, a second leaf valve that is stacked on the first leaf valve, and a third leaf valve that is stacked on the second leaf valve. The first leaf valve includes an annular first leaf valve main body, and three or more odd-numbered circumferential holes provided in the first leaf valve main body at equal intervals in the circumferential direction. The second leaf valve includes an annular second leaf valve main body, an even number of elongated holes provided at equal intervals in the circumferential direction in the second leaf valve main body, and the respective circumferential directions. Long hole and second leaf The third leaf valve is annular and has a diameter that covers the long hole and the choke of the second leaf valve. The circumferential lengths of the long holes of the first leaf valve and the second leaf valve are the same as the long holes of the first leaf valve, regardless of the circumferential angle of the second leaf valve with respect to the first leaf valve. The wrap area with the elongated hole of the second leaf valve is set to be substantially constant.

  Further, the valve structure in the third problem solving means is a valve that is provided at the downstream end of the flow path, includes a laminated leaf valve that opens and closes the downstream end of the flow path, and generates a predetermined damping force when the working fluid passes. In the structure, the valve structure includes a first leaf valve that contacts the downstream end of the flow path, a second leaf valve that is stacked on the first leaf valve, and a third leaf valve that is stacked on the second leaf valve. The first leaf valve includes a first leaf valve main body and an even number of circumferentially elongated holes provided at equal intervals in the circumferential direction in the first leaf valve main body. Is a second leaf valve body, three or more odd-numbered circumferential holes provided at equal intervals in the circumferential direction in the second leaf valve body, and each of the elongated holes and the second leaf valve body. Cutting between the outer circumference The third leaf valve is annular and has a diameter that covers the long hole and the choke of the second leaf valve. Each of the first leaf valve and the second leaf valve The circumferential length of the long hole is such that the long leaf hole of the first leaf valve and the long hole of the second leaf valve are overlapped regardless of the circumferential angle of the second leaf valve with respect to the first leaf valve. The area is set so as to be substantially constant.

  According to the invention of each claim, since the lap area between the long holes of adjacent leaf valves hardly changes, there is no need to adjust the assembly position when assembling the leaf valves. That is, since the adjustment of the assembly position required in the conventional valve structure is not required, the assembly work is greatly facilitated.

  Furthermore, in the conventional valve structure, there was a concern that the generated damping force would vary depending on the product, but in the valve structure of the present invention, the area ratio hardly changes regardless of the assembly position. There is no risk of variation in the generated damping force. That is, a uniform and stable damping force can be generated.

  The valve structure of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a state in which a valve structure is embodied in a piston portion of a shock absorber. FIG. 2A is a front view of a first leaf valve having a valve structure. FIG. 2B is a front view of a second leaf valve having a valve structure. FIG. 2C is a front view of a third leaf valve having a valve structure. FIG. 3 is a view showing a state in which the second leaf valve is assembled to the first leaf valve. FIG. 4 is a view showing a state in which the second leaf valve is assembled to the first leaf valve. FIG. 5 is a view showing a state in which the second leaf valve is assembled to the first leaf valve. FIG. 6 is a view showing a state in which the second leaf valve is assembled to the first leaf valve. FIG. 7 is a view showing a state in which the second leaf valve is assembled to the first leaf valve. FIG. 8 is a view showing a state in which the second leaf valve is assembled to the first leaf valve. FIG. 9 shows the ratio of the wrap area of the arc-shaped elongated hole of the first leaf valve and the arc-shaped elongated hole of the second leaf valve to the area of the arc-shaped elongated hole of the second leaf valve, and the second leaf with respect to the first leaf valve. It is a figure which shows the relationship with the assembly | attachment angle of a valve | bulb.

  As shown in FIG. 1, the valve structure of the present invention is embodied in a piston portion of a shock absorber, and an annular first leaf valve 10 that abuts a downstream end of a port 31 that is a flow path provided in the piston 2. The annular second leaf valve 15 stacked on the first leaf valve 10 and the annular third leaf valve 20 stacked on the second leaf valve 15 are configured.

  On the other hand, a shock absorber in which this valve structure is embodied, although not shown, is slidable on the cylinder 100, a head member (not shown) for sealing the upper end of the cylinder 100, and a head member (not shown). The piston rod 1 that penetrates the piston rod 1, the piston 2 provided at the end of the piston rod 1, and a sealing member (not shown) that seals the lower end of the cylinder 100. Is divided into a rod-side chamber R1 and a piston-side chamber R2, and a compensation chamber R partitioned by a free piston (not shown) is formed below the cylinder 100, and hydraulic oil is formed in the rod-side chamber R1 and the piston-side chamber R2. At the same time, a gas is sealed in the compensation chamber R. Further, the diameter-reduced portion 1a of the piston rod 1 includes a valve stopper 50, a spacer 42, annular leaf valves 41, 40, a piston 2, each leaf valve 10, 15, 20 of the valve structure, and an annular shape in order from the top in FIG. Leaf valves 21 and 22 and a spacer 23 are inserted, and each member is fixed to the piston rod 1 by a piston nut N. Further, the piston 2 is provided with ports 30 and 31 for communicating the rod-side chamber R1 and the piston-side chamber R2, and one port 30 has an annular leaf valve 40 having a hole 40a and an annular leaf having a hole 41a. A valve 41 is stacked, and the port 30 allows only the flow of hydraulic oil from the piston side chamber R2 to the rod side chamber R1, and the other port 31 has each leaf valve 10 of the above-described valve structure. , 15 and 20 are provided.

  The shock absorber is configured as a so-called single cylinder type as described above, but may be a double cylinder type or a type in which a compensation chamber is separated from the shock absorber body as a tank.

  Hereinafter, the valve structure will be described in detail. As shown in FIG. 2 (A), the first leaf valve 10 includes a first leaf valve body 14 formed in an annular plate shape and a circular shape on the first leaf valve body 14. It consists of three elongated holes 11 along the circumferential direction provided at equal intervals in the circumferential direction, and is in contact with the outlet end of the port 31 of the piston 2. Next, as shown in FIG. 2 (B), the second leaf valve 15 is provided with a second leaf valve body 18 formed in an annular plate shape and at an equal interval in the circumferential direction on the second leaf valve body 18. Each of the four long holes 16 along the circumferential direction, and a passage 17 formed by cutting out between each of the long holes 16 and the outer periphery of the second leaf valve 15, and is laminated on the first leaf valve 10. Has been. The long holes 16 are provided so as to be positioned on the circumference of the first leaf valve 10 where the long holes 11 are provided when stacked on the first leaf valve 10. Therefore, when the second leaf valve 15 is stacked on the first leaf valve 10, the long hole 11 and the long hole 16 overlap each other. The circumferential lengths of the long hole 11 and the long hole 16 are the same as those of the first leaf valve 10, which will be described later, regardless of the circumferential angle of the second leaf valve 15 with respect to the first leaf valve 10. The lap area W between the long hole 11 and the long hole 16 of the second leaf valve 15 is set to be substantially constant.

  Further, as shown in FIG. 2C, the third leaf valve 20 is formed in an annular plate shape and is stacked on the second leaf valve 15, and the inner and outer diameters thereof are the circles of the second leaf valve 15. It is set so that the arc-shaped long hole 16 and the passage 17 can be covered. Accordingly, the passage 17 of the second leaf valve 15 is covered with the first leaf valve main body 14 and the third leaf valve 20 in FIG. 1 so that the passage 17 functions as a choke. The choke may be formed by a groove that communicates the long hole 16 and the outer periphery of the second leaf valve 15 when the second leaf valve 15 has a thick vertical width in FIG. In this case, if this groove faces the first leaf valve 10, the third leaf valve 20 may be omitted. However, as in the present embodiment, the formation of the passage 17 and the provision of the third leaf valve has an advantage that the machining of the choke is simplified.

  Here, during the expansion stroke of the shock absorber, the rod side chamber R1 contracts, so that the hydraulic pressure in the rod side chamber R1 increases, and the hydraulic oil deflects the leaf valves 10, 15, and 20 of the valve structure, and each annular leaf It flows from the rod side chamber R1 to the piston side chamber R2 via the holes 40a, 41a of the valves 40, 41 and the port 31. That is, the leaf valves 10, 15, and 20 of the valve structure are provided at the downstream end of the port 31 that is a flow path.

  At this time, when the moving speed of the piston 2 is very low with respect to the cylinder 100, the pressure in the rod side chamber R1 does not reach the valve opening pressure at which the first leaf valve 10 opens the port 31, so that Oil flows from the rod side chamber R1 to the piston side chamber R2 through the long hole 11 of the first leaf valve 10, the long hole 16 of the second leaf valve 15, and the passage 17. Therefore, in this case, a damping force is generated by the pressure loss that occurs when the hydraulic oil passes through the long holes 11 and 16 and the passage 17. Further, when the moving speed of the piston 2 is low with respect to the cylinder 100, the pressure in the rod side chamber R1 reaches the valve opening pressure at which the third leaf valve 20 opens the port 31, and the hydraulic oil is supplied to the third leaf. The valve 20 and each of the annular leaf valves 21 and 22 are deflected, pass through a gap formed between the second leaf valve 15 and the third leaf valve 20, and flow into the piston side chamber R2 from the rod side chamber R1. That is, in this case, a damping force is generated due to a pressure loss that occurs when the hydraulic oil passes through a gap formed between the second leaf valve 15 and the third leaf valve 20. Subsequently, when the moving speed of the piston 2 is high with respect to the cylinder 100, the pressure in the rod side chamber R1 reaches the valve opening pressure at which the first leaf valve 10 opens the port 31, and the hydraulic oil flows into the first leaf. The valve 10, the second leaf valve 15, the third leaf valve 20, and the annular leaf valves 21, 22 are respectively bent to pass through the gap formed between the port 31 and the first leaf valve 10, and the rod side chamber R <b> 1. Flows into the piston side chamber R2. That is, in this case, a damping force is generated due to a pressure loss that occurs when the hydraulic oil passes through a gap formed between the port 31 and the first leaf valve 10.

  Therefore, in the valve structure of the present invention, when the piston speed works as a choke of the passage 17 from a very low speed range, a damping force proportional to the piston speed can be generated, and when applied to a shock absorber. Since the vehicle can generate a sufficient damping force even when the vehicle passes through an unwind road or the like, the ride comfort in the vehicle can be improved.

  Depending on the setting of the damping force to be generated in this valve structure, an annular leaf valve 22 is further laminated on the first, second, and third leaf valves 10, 15, and 20 of the valve structure as shown in the figure. Alternatively, another annular leaf valve may be stacked, or each leaf valve 10, 15 and 20 of the valve structure may be energized by an energizing spring. If not necessary, the annular leaf valve 20 is omitted. May be. The generated damping force can also be adjusted by setting the leaf thickness of each leaf valve.

  Although the valve structure is configured as described above, its operation will be described. A state in which the first leaf valve 10 and the second leaf valve 15 are stacked as shown in FIGS. 3 to 8 will be described. FIGS. 3 to 8 are views showing a state in which the second leaf valve 15 is stacked on the first leaf valve 10, but FIG. 4 shows that the second leaf valve 15 is changed to the first leaf valve 10 from the state of FIG. 3. On the other hand, they are laminated by rotating them counterclockwise by 3 degrees. Similarly, FIG. 4 is from the stacked state of FIG. 3, FIG. 5 is from the stacked state of FIG. 4, FIG. 6 is from the stacked state of FIG. From the state, it shows a state in which the layers are rotated and rotated three times counterclockwise.

  As described above, when the second leaf valve 15 is stacked on the first leaf valve 10 at different angles in the circumferential direction, the long hole 11 of the first leaf valve 10 and the long hole of the second leaf valve 15 are stacked. 16 and the overlap area W between the long hole 11 of the first leaf valve 10 and the long hole 16 of the second leaf valve 15 is changed so that the second leaf valve 15 is assembled to the first leaf valve 10. When the attachment angle is changed, it changes as shown in FIG.

  As can be seen from FIG. 9, in the present embodiment, the second leaf valve 15 having the wrap area W in the arc shape no matter how the second leaf valve 15 is stacked on the first leaf valve 10. The ratio of the long holes 16 to the area (hereinafter simply referred to as “area ratio”) is approximately 90%. In order to increase the area ratio, the circumferential width between the long hole 11 and the long hole 11 of the first leaf valve 10 is reduced, and the long hole 16 and the long hole 16 of the second leaf valve 15 are reduced. It is desirable to set the width in the circumferential direction to be small, but it may be set to an appropriate width from the viewpoint of processing limit and strength compensation of the leaf valves 10 and 15, but if the width is too large, the area ratio It is preferable to make it as small as possible.

  Therefore, in this valve structure, even if the second leaf valve 15 is displaced in the circumferential direction with respect to the first leaf valve 10, the area ratio hardly changes. Therefore, it is necessary to adjust the assembly position during assembly. Absent. That is, since the adjustment of the assembly position required in the conventional valve structure is not required, the assembly work is greatly facilitated.

  Furthermore, in the conventional valve structure, there was a concern that the generated damping force would vary depending on the product, but in the valve structure of the present invention, the area ratio hardly changes regardless of the assembly position. There is no risk of variation in the generated damping force. That is, a uniform and stable damping force can be generated.

  The long holes 11 provided in the first leaf valve 10 may be an odd number of 3 or more, and the long holes 16 provided in the second leaf valve 15 may be an even number, or conversely, the long holes 11 provided in the first leaf valve 10. May be an even number, and the long holes 16 provided in the second leaf valve 15 may be an odd number of 3 or more. By doing so, the change in the area ratio due to the assembly position of the second leaf valve with respect to the second leaf valve 10 can be reduced, so that the above-described effects can also be achieved in this case. However, if the number of the long holes 11 and the long holes 16 is too large, the opening areas of the first leaf valve 10 and the second leaf valve 15 are reduced, and the lap area is inevitably reduced. A smaller number of the long holes 16 is more efficient. In the present embodiment, the case where two leaf valves having long holes are described has been described. However, as long as the lap area can be made substantially constant, three or more long holes are provided. Leaf valves may be stacked.

  In the above description, the case where the valve structure of the present invention is embodied in the piston portion of the shock absorber has been described, but it may be embodied in the base valve portion.

 This is the end of the description of the embodiment of the present invention, but the scope of the present invention is of course not limited to the details shown or described.

It is a longitudinal cross-sectional view which shows the state by which the valve structure was embodied in the piston part of the buffer. (A) is a front view of a first leaf valve with a valve structure, (B) is a front view of a second leaf valve with a valve structure, and (C) is a front view of a third leaf valve with a valve structure. FIG. It is a figure which shows the state which assembled | attached the 2nd leaf valve with respect to the 1st leaf valve. It is a figure which shows the state which assembled | attached the 2nd leaf valve with respect to the 1st leaf valve. It is a figure which shows the state which assembled | attached the 2nd leaf valve with respect to the 1st leaf valve. It is a figure which shows the state which assembled | attached the 2nd leaf valve with respect to the 1st leaf valve. It is a figure which shows the state which assembled | attached the 2nd leaf valve with respect to the 1st leaf valve. It is a figure which shows the state which assembled | attached the 2nd leaf valve with respect to the 1st leaf valve. The ratio of the lap area of the arc-shaped elongated hole of the first leaf valve and the arc-shaped elongated hole of the second leaf valve to the area of the arc-shaped elongated hole of the second leaf valve, and the assembly of the second leaf valve to the first leaf valve It is a figure which shows the relationship with an angle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Piston rod 2 Piston 10 1st leaf valve 11, 16 long hole 14 1st leaf valve main body 15 2nd leaf valve 17 passage 18 2nd leaf valve main body 20 3rd leaf valve 31 Port which is a flow path
W lap area

Claims (3)

A valve structure that is provided at the downstream end of the flow path and has a laminated leaf valve that opens and closes the downstream end of the flow path, and generates a predetermined damping force when the working fluid passes through. The valve structure is equally spaced in the circumferential direction. At least one annular leaf valve having an odd number of long holes and an even number of long holes along the circumferential direction provided at equal intervals in the circumferential direction. And at least one annular leaf valve with an odd number of long holes, and a leaf valve with an even number of long holes is stacked on the leaf valve with an odd number of long holes. A leaf valve with an odd number of long holes is stacked on the provided leaf valve, and the leaf valve farthest from the downstream end of the flow path is provided with a choke that communicates between the outer periphery and each long hole. , Adjacent Lee The circumferential length of each long hole of the valve is set so that the lap area between the long holes of adjacent leaf valves is substantially constant regardless of the circumferential angle of each leaf valve. A valve structure characterized by that. A valve structure that is provided at a downstream end of the flow path and includes a laminated leaf valve that opens and closes the downstream end of the flow path, and generates a predetermined damping force when the working fluid passes through the valve structure. , A second leaf valve stacked on the first leaf valve, and a third leaf valve stacked on the second leaf valve, the first leaf valve being an annular first The leaf valve body includes a first leaf valve body and three or more odd-numbered elongated holes provided at equal intervals in the circumferential direction. The second leaf valve is an annular second leaf valve. A body, an even number of elongated holes along the circumferential direction provided at equal intervals in the circumferential direction on the second leaf valve body, and between the elongated holes along the circumferential direction and the outer periphery of the second leaf valve body. And the choke provided And the third leaf valve is annular and has a diameter that covers the elongated hole and the choke of the second leaf valve, and the circumferential direction of each elongated hole of the first and second leaf valves. The length of the lap area between the long hole of the first leaf valve and the long hole of the second leaf valve is substantially constant regardless of the circumferential angle of the second leaf valve with respect to the first leaf valve. A valve structure characterized by being set as follows. A valve structure that is provided at a downstream end of the flow path and includes a laminated leaf valve that opens and closes the downstream end of the flow path, and generates a predetermined damping force when the working fluid passes through the valve structure. A first leaf valve that contacts the first leaf valve, a second leaf valve that is stacked on the first leaf valve, and a third leaf valve that is stacked on the second leaf valve. The first leaf valve is a first leaf valve. The main body and the first leaf valve main body are configured with an even number of elongated holes along the circumferential direction provided at equal intervals in the circumferential direction. The second leaf valve includes a second leaf valve main body and a second leaf valve. Three or more odd-numbered long holes provided in the main body at equal intervals in the circumferential direction, and a passage provided by cutting out between each long hole and the outer periphery of the second leaf valve main body Configured, the third leaf valve It is annular and has a diameter that covers the long hole and the passage of the second leaf valve. The circumferential length of each long hole of the first leaf valve and the second leaf valve is the same as that of the first leaf valve. On the other hand, the lap area between the long hole of the first leaf valve and the long hole of the second leaf valve is set to be substantially constant regardless of the circumferential angle of the second leaf valve. And valve structure.

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