JP2019094934A - Valve and buffer - Google Patents

Abstract

To provide a valve and a buffer, capable of preventing mixing of contaminant at inexpensive cost, to prevent occurrence of noise or deterioration of an attenuation characteristic.SOLUTION: The valve comprises: a plurality of pressure side valve seats 21 provided so as to project from an annular valve seat member 4 with a plurality of pressure side ports 6, and surrounding an outlet end of each pressure side port 6, wherein the pressure side ports are arranged in a circumferential direction; an annular plate member 10 laminated on a center side of the valve seat member 4, and forming a clearance S between itself and each pressure side valve seat 21; and a pressure side relief valve 9 of which a center side is laminated on the annular plate member 10, and an outer peripheral side is detachably seated on the pressure side valve seat 21 to open/close the pressure side port 6.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a valve and a shock absorber.

  Conventionally, valves are used as shock absorbers and the like interposed between a vehicle body of a vehicle and an axle. Among such valves, there are provided a valve seat member having a port and a valve seat, and a leaf valve which is stacked on the valve seat member and which is seated on the valve seat to open and close the port. There is a valve in which a valve seat member is provided with a passage for preventing contamination between the leaf valve and the inside of the valve seat and a recess for expanding the inlet of the passage (e.g., Patent Document 1).

  More specifically, the valve seat member defines two chambers filled with hydraulic fluid, and the port communicates the two chambers. The valve seat has an annular boss portion and an outer peripheral seat portion connected to the boss portion and surrounding a window at the outlet end of the port. Further, the leaf valve is a thin annular plate, and the inner peripheral side thereof is pressed against and fixed to the boss portion, and the outer peripheral side is seated on the outer peripheral seat portion in a state where bending in a direction away from the valve seat is permitted. Do. Furthermore, if the room on the inlet side of the port is one room and the room on the outlet side is the other room among the two rooms, the passage opens on the boss side of the window at the valve seat and It is in communication. According to the configuration, when the pressure in one chamber rises and the outer periphery of the leaf valve is flexed and the port is opened, the flow of hydraulic oil passing through the port causes the flow of hydraulic oil through the passage to the other chamber. It occurs.

  Thereby, in the valve having the above-mentioned passage, when the outer periphery of the leaf valve is largely bent, even if the contaminant mixed in the hydraulic oil passing through the port moves to the boss side rather than the window in the valve seat, the contaminant Is guided by the recess into the passage and discharged by the flow passing through the passage. For this reason, in the valve having the above-mentioned passage, the pinching of contaminants between the valve seat and the leaf valve is prevented to prevent the generation of abnormal noise and the deterioration of the attenuation characteristic.

JP 2012-255467

  As described above, in the valve described in Patent Document 1, a recess is provided in the valve seat member to facilitate guiding the contaminant into the passage, and further, the other chamber side of the valve seat member is provided from the bottom of the recess. A through hole is provided to the end, and the through hole and the recess form a passage. However, forming both the recess and the through hole in the valve seat member in this manner is complicated and expensive.

  Then, this invention aims at provision of the valve | bulb and buffer which can prevent the pinching of a contaminant and can prevent generation | occurrence | production of noise, and a deterioration of attenuation characteristics at cheap cost.

  The means for solving the above problems is provided with a plurality of valves provided so as to project from an annular valve seat member having a plurality of first ports arranged circumferentially and surrounding the outlet end of each first port. An annular plate member laminated on the center side of the seat and the valve seat member to form a gap between each of the valve seats, the center side is stacked on the annular plate member and the outer periphery side is the valve seat And a leaf valve for opening and closing the first port.

  Further, the valve seat member is disposed between the respective valve seats, has an inlet end opened to the side where the outlet end of the first port is opened, and has a plurality of second ports communicating with the gap, the annular The plate member may be a valve that overlaps with the second port in an axial direction and is disposed to face the inlet end of the second port at an interval. According to this configuration, the annular plate member also functions as a member that prevents the backflow of contaminants that did not flow through the second port.

  In addition, the annular plate member may overlap with the second port by a half or more from the inside in the axial direction. According to this configuration, the annular plate member further improves the effect of preventing the backflow of contaminants.

  Further, the valve seat member is formed along the center side of the valve seat at the center side of the valve seat member and the low surface portion formed between the adjacent valve seats and provided with the second port. An annular recess having an axial position lower than that of the valve seat and an axial position higher than that of the low surface portion, and the annular plate member has a disk portion whose outer diameter is smaller than the outer diameter of the recess The clearance may be formed between the disc portion and the valve seat and connected to the second port via the lower surface portion by being fitted into the recess. According to this configuration, the gap can be easily formed inside the valve seat, and the contamination accommodated in the gap can easily flow to the lower surface side.

  A cylinder, a rod axially movably inserted in the cylinder, and the valve are provided, and the valve resists the flow of liquid moving when the cylinder and the rod move relative to each other. As a shock absorber. According to this configuration, the shock absorber can exert desired damping force.

  According to the valve and shock absorber of the present invention, it is possible to prevent entrapment of contaminants between the valve seat member and the inner peripheral side of the leaf valve at low cost, thereby preventing generation of abnormal noise and deterioration of attenuation characteristics .

It is a longitudinal cross-sectional view which shows a part of buffer provided with the valve | bulb which concerns on this Embodiment. It is a top view which shows the state which looked at the valve seat member which concerns on this Embodiment from the upper part in FIG. It is a top view which shows the state which provided the cyclic | annular plate member in the valve seat member shown in FIG. It is a top view which shows the cyclic | annular board member which concerns on this Embodiment. FIG. 10 is a longitudinal cross-sectional view of a portion of a shock absorber comprising a valve having a variant of the annular plate member; It is a top view which shows the state which looked at the valve-seat member of FIG. 5 from the upper part in FIG.

  Hereinafter, the present embodiment will be described with reference to the drawings. The same reference numerals as in the several figures indicate the same or corresponding parts.

  The valve V of this example is embodied in the piston portion of the shock absorber 1 as shown in FIG. The shock absorber 1 includes a cylindrical cylinder 2, a rod 3 axially moved in and out of the cylinder 2, and a free piston (not shown) slidably inserted on the opposite rod side of the cylinder 2. A head cap (not shown) formed annularly and slidingly contacting the outer periphery of the rod 3 to close one end opening of the cylinder 2 and a bottom cap (not shown) closing the other end opening of the cylinder 2; A valve V is attached to the tip of 3. Then, the cylinder 2 is connected to the axle or body of the vehicle, and the rod 3 is connected to the axle or body opposite to the connected one of the cylinders 2. Therefore, when an impact due to road surface unevenness is input to the wheel, the rod 3 moves in and out of the cylinder 2 and the shock absorber 1 operates to expand and contract.

  The inside of the cylinder 2 is divided by a free piston into a liquid chamber and an air chamber (not shown), and the liquid chamber is a valve V provided at the tip of the rod 3 and the expansion side chamber R1 in the upper side in the drawing. And the lower pressure side chamber R2 in the figure. A fluid such as hydraulic oil is sealed in the expansion side chamber R1 and the pressure side chamber R2, and a gas is sealed in the air chamber. Then, the air chamber expands and contracts due to the sliding of the free piston, and compensates for the volume change in the cylinder 2 corresponding to the emerging and retracting volume of the rod 3 which moves in and out when the shock absorber 1 expands and contracts.

  Although the shock absorber 1 of this example is a single cylinder type, it is a double cylinder type in which an outer shell covering the outer periphery of the cylinder 2 is provided and a base valve is inserted at the opposite rod end of the cylinder 2 instead of the free piston. It may be set to In the case of the double cylinder type, the reservoir formed between the outer shell and the cylinder 2 compensates for the in-cylinder volume change corresponding to the rod appearing and retracting volume accompanying the expansion and contraction operation of the shock absorber body D.

  Next, the structure of the valve V of this example will be described in detail. The valve V is configured to include a piston as a valve seat member 4 and annular expansion side leaf valves 8 and pressure side leaf valves 9 stacked on both sides in the axial direction of the piston.

  The valve seat member 4 has a mounting hole 4a formed in the center when viewed from the axial direction, pressure side ports 6 as a plurality of first ports arranged circumferentially around the mounting hole 4a, and each pressure side port 6 It has expansion side ports 7 as a plurality of second ports arranged in the circumferential direction. In this example, as shown in FIG. 2, the valve seat member 4 includes an expansion side port 7 opened to the inner peripheral side which is the center side of the valve seat member 4 and a pressure side port 6 opened to the outer peripheral side. They are arranged side by side in the circumferential direction and alternately arranged, and the expansion side chamber R1 and the pressure side chamber R2 are in communication with each other. Also, the number of each port may be determined arbitrarily. In addition, although the valve seat member 4 of this example is formed circularly in the axial direction view, it may be formed polygonal.

  Further, an annular window 4b is provided on the pressure side chamber R2 side which is the lower end in FIG. 1 of the valve seat member 4, and the outlet end of each expansion side port 7 communicates with the annular window 4b. Furthermore, on the pressure side chamber R2 side of the valve seat member 4, an annular inner boss portion 4c surrounding the mounting hole 4a and along the inner periphery of the annular window 4b, and an annular ring surrounding the annular window 4b along the outer periphery of the annular window 4b The expansion side valve seat 20 is formed. Further, the pressure side port 6 is opened to the outer peripheral side of the expansion side valve seat 20.

  On the other hand, on the expansion side chamber R1 side which is the upper end in FIG. 1 of the valve seat member 4, a plurality of windows 4d fan-shaped so as to spread on the outer peripheral side of the valve seat member 4 are provided independently in the circumferential direction The outlet end of each pressure side port 6 is in communication with the window 4d.

  Further, as shown in FIG. 2, on the expansion side chamber R1 side of the valve seat member 4, a pressure side valve seat 21 provided so as to protrude from the valve seat member 4 and surrounding the window 4d is formed. The pressure-side valve seats 21 are circumferentially arranged at four equal intervals according to the number of windows 4 d (pressure-side ports 6). Further, a low surface portion 13 to which the compression side leaf valve 9 does not abut is provided between the pressure side valve seats 21 and 21, and an open end of the expansion side port 7 is formed on the inner peripheral side of the low surface portion 13. There is.

  Furthermore, as shown in FIG. 2, on the expansion side chamber R1 side of the valve seat member 4, there is provided an annular recess 22 formed so as to surround the mounting hole 4a and along the inner peripheral side of each pressure side valve seat 21. ing. The surface of the recess 22 is set to be lower in axial position than the pressure-side valve seat 21 and higher in axial position than the low surface portion 13.

  And in this example, as shown in FIG. 3, the annular annular plate member 10 is inserted in the recessed part 22, and the clearance gap S is formed between the inner side of each pressure side valve seat 21 and the annular plate member 10. ing. Specifically, as shown in FIG. 4, a plurality of annular plate members 10 of this example are provided in the circumferential direction of the disk portion 11 so as to project radially from the outer periphery of the disk portion 11 and the disk portion 11. A projecting portion 12; Further, since the outer diameter of the disk portion 11 is smaller than the outer diameter of the recess 22, a gap S is formed between each pressure side valve seat 21 and the disk portion 11. Further, as shown in FIG. 3, the protrusion 12 of this example is formed so that the dimension in the width direction orthogonal to the radial direction is narrower than the width of the low surface portion 13 between the adjacent pressure side valve seats 21, 21. It is done. Therefore, the gap S communicates with the space surrounded by the adjacent pressure side valve seats 21 and 21 and the pressure side leaf valve 9. However, the dimension in the width direction of the projecting portion 12 may be the same as the width of the lower surface portion 13 by providing a groove on the upper surface of the annular plate member 10 for connecting the gap S to the space.

  Further, since the annular plate member 10 is formed to have a thickness substantially the same as the axial depth of the recess 22, the upper surface height of the annular plate member 10 in the axial direction of the pressure side valve seat 21 when fitted into the recess 22. It will be about the same height. However, the upper surface height of the annular plate member 10 fitted in the recess 22 of the valve seat member 4 should not exceed the axial height of the pressure side valve seat 21.

  Moreover, the protrusion part 12 of this example is provided in four equal intervals according to the space | interval between the pressure side valve seats 21 and 21 which adjoin each other. As a result, as shown in FIG. 3, the annular plate member 10 of this example can be fitted into the recess 22 in a state where the protrusion 12 is disposed between the adjacent pressure side valve seats 21, 21.

  Further, as shown in FIG. 2, the expansion side port 7 is provided on the inner peripheral side of the low surface portion 13 which is a surface between the adjacent pressure side valve seats 21 in the valve seat member 4. Therefore, as shown in FIG. 1 and FIG. 3, the projecting portion 12 and the disk portion 11 disposed between the adjacent pressure side valve seats 21 and 21 overlap so as to cover the expansion side port 7 in the axial direction view . Moreover, in this example, since the axial direction position of the recessed part 22 which the cyclic | annular plate member 10 is engage | inserted and laminated | stacked is higher than the low-surface part 13, as shown in FIG. There is a gap between the end.

  Further, the compression side leaf valve 9 stacked on the expansion side chamber R1 side of the valve seat member 4 and the expansion side leaf valve 8 stacked on the pressure side chamber R2 side of the valve seat member 4 are configured by stacking a plurality of thin annular plates. It is done. Further, an annular seat 14 and an annular valve stopper 15 which are annular in shape on the upper side in FIG. 1 of the pressure side leaf valve 9 and which only contact the inner peripheral side of the pressure side leaf valve 9 are laminated in order. On the lower side of the other expansion side leaf valve 8 in FIG. 1, a spacer 16 having a diameter that is annular and that abuts only on the inner peripheral side of the expansion side leaf valve 8 is stacked. The valve seat member 4 is provided on the outer periphery of the mounting portion 3 a provided at the tip of the rod 3 together with the annular plate member 10, the expansion side leaf valve 8, the pressure side leaf valve 9, the spacers 14 and 16 and the valve stopper 15. It is mounted and fixed by a nut 17.

  More specifically, at the end of the rod 3, an attachment portion 3 a having an outer diameter smaller than that of the other portion is provided, and an annular step 3 b is formed at the boundary between the attachment portion 3 a and the other portion. There is. In addition, a screw groove is formed at the tip of the mounting portion 3a, and the nut 17 can be screwed. The valve seat member 4, the annular plate member 10, the expansion side leaf valve 8, the pressure side leaf valve 9, the spacers 14 and 16 and the valve stopper 15 are all annular, and a mounting hole is provided at the central portion. Therefore, the mounting portion 3a of the rod 3 is attached to the mounting holes of the valve stopper 15, the seat 14, the pressure side leaf valve 9, the annular plate member 10, the valve seat member 4, the extension side leaf valve 8 and the seat 16 in the above order When the nut 17 is screwed into the tip end of the mounting portion 3 a which is inserted and protrudes from the spacer 16, these members can be sandwiched and fixed between the nut 17 and the step 3 b.

  Thereby, only the inner peripheral side of the expansion side leaf valve 8 stacked on the pressure side chamber R2 side of the valve seat member 4 is clamped and fixed to the inner peripheral boss portion 4c via the spacer 16, so the outer peripheral side Only the deflection is permitted, and the outer peripheral side is separably seated on the expansion side valve seat 20.

  Further, since the expansion side leaf valve 8 is stacked on the pressure side chamber R2 side of the valve seat member 4 and covers the annular window 4b communicating with the outlet end of each expansion side port 7, the communication of the expansion side port 7 is It is cut off. On the other hand, since the inlet of the pressure side port 6 is provided outside the expansion side valve seat 20, the pressure side port 6 and the pressure side chamber R2 are always in communication.

  On the other hand, since only the inner peripheral side of the compression side leaf valve 9 stacked on the expansion side chamber R1 side of the valve seat member 4 is clamped and fixed to the annular plate member 10 via the spacer 14, only the outer peripheral side bends The outer peripheral side is seated on the pressure side valve seat 21 so as to be capable of being separated and seated.

  Further, since the pressure side leaf valve 9 is stacked on the expansion side chamber R1 side of the valve seat member 4 and covers all the windows 4d communicating with the outlet end of each pressure side port 6, the communication of the pressure side port 6 is blocked. Ru. On the other hand, since the inlet of the expansion side port 7 is provided on the inner peripheral side of the low surface portion 13 where the compression side leaf valve 9 between the compression side valve seats 21 and 21 does not abut, the expansion side port 7 and the expansion side chamber R1 is always in communication.

  Further, as shown in FIG. 1 and FIG. 2, projections 4 e are provided on the outer peripheral side of the lower surface portion 13 between the adjacent pressure side valve seats 21, 21, and these pressure side leaf valves 9 are The support, and the pressure side leaf valve 9 is prevented from being bent toward the valve seat member 4 by the pressure (back pressure) of the expansion side chamber R1. Thereby, the pressure side leaf valve 9 is prevented from being broken by the pressure from the expansion side chamber R1 side. In addition, it is considered that the protrusion 4e does not interfere with the communication between the expansion side chamber R1 and the expansion side port 7.

  Next, the operation and effects of the shock absorber 1 provided with the valve V according to the present embodiment will be described. During the extension operation of the shock absorber 1 in which the rod 3 exits from the cylinder 2, the valve V moves upward in the cylinder 2 in FIG. 1 to compress the expansion side chamber R1. Then, the pressure in the expansion side chamber R1 is increased, and the pressure acts on the expansion side port 7 to bend the expansion side leaf valve 8. Then, when the expansion side leaf valve 8 is bent downward in FIG. 1, a gap is formed between the outer peripheral portion of the expansion side leaf valve 8 and the expansion side valve seat 20, so the liquid in the expansion side chamber R1 flows to the expansion side port 7. It flows through to pressure side room R2. That is, when the expansion side leaf valve 8 is opened by receiving the pressure in the expansion side chamber R1, the expansion side leaf valve 8 provides resistance to the flow of the liquid passing through the expansion side port 7. Exerts an expansion damping force that suppresses the extension operation.

  As for the pressure side leaf valve 9, when the pressure in the expansion side chamber R1 increases, the pressure acts in the direction to press the pressure side leaf valve 9 against the pressure side valve seat 21, so the pressure side leaf valve 9 closes the pressure side port 6 Maintained.

  On the contrary, at the time of contraction operation of the shock absorber 1 in which the rod 3 intrudes into the cylinder 2, the valve V moves downward in the cylinder 2 in FIG. 1 to compress the pressure side chamber R2. Then, the pressure in the pressure side chamber R2 rises, and the pressure acts in a direction to bend the pressure side leaf valve 9 through the pressure side port 6. Then, when the pressure side leaf valve 9 is bent upward in FIG. 1, a gap is formed between the outer peripheral portion of the pressure side leaf valve 9 and the pressure side valve seat 21, so the liquid in the pressure side chamber R2 passes through the pressure side port 6 and the expansion side chamber. It flows to R1. That is, when the pressure side leaf valve 9 is opened by receiving the pressure in the pressure side chamber R2, the shock absorber 1 contracts because the pressure side leaf valve 9 resists the flow of the liquid passing through the pressure side port 6. The pressure side damping force that suppresses the operation is exhibited.

  As for the expansion side leaf valve 8, when the pressure in the pressure side chamber R2 increases, the pressure acts in a direction to press the expansion side leaf valve 8 against the expansion side valve seat 20, so the expansion side leaf valve 8 is an expansion side port. 7 is kept closed.

  Further, in the valve V of this example, even if the pressure side leaf valve 9 is largely bent when the shock absorber 1 is contracted, the contamination mixed into the liquid is a gap formed inside the pressure side valve seat 21 by the annular plate member 10 It is accommodated in S.

  Therefore, in the present embodiment, since it is possible to prevent the pinching of the contaminant between the annular plate member 10 and the inner peripheral side of the pressure side leaf valve 9, the closing of the pressure side leaf valve 9 is not inhibited by the contaminant. The outer peripheral portion of the valve 9 does not float from the pressure side valve seat 21.

  Therefore, the outer peripheral portion of the pressure side leaf valve 9 is not vibrated by the liquid flowing to the pressure side chamber R2 through the gap between the pressure side valve seat 21 and the outer peripheral portion of the pressure side leaf valve 9, no noise is generated. Furthermore, since the pressure side leaf valve 9 does not leak, the shock absorber 1 can exert a desired damping force. Further, since the gap S of this example communicates with the space surrounded by the pressure-side valve seats 21 and 21 and the pressure-side leaf valve 9 adjacent to each other, contaminants contained in the gap S are discharged to the low surface portion 13 side. Be done. Under the present circumstances, since the recessed part 22 of this example is set so that an axial direction position may be high rather than the low surface part 13, the contaminant accommodated in the clearance gap S is easily discharged | emitted by the low surface part 13 side with a liquid.

  As described above, the valve V of this example is provided so as to project from the annular valve seat member 4 having the pressure side ports 6 as the plurality of first ports arranged in the circumferential direction and from the valve seat member 4 Ring-shaped annular plate member 10 which is stacked on the center side of the valve seat member 4 to form a gap S between each pressure side valve seat 21 and a plurality of pressure side valve seats 21 surrounding the outlet end of each pressure side port 6; The pressure side leaf valve 9 is configured such that the center side is stacked on the annular plate member 10 and the outer circumference side is seated on the pressure side valve seat 21 to open and close the pressure side port 6.

  According to this configuration, even if the pressure side leaf valve 9 is largely opened, the contamination mixed in the liquid passing through the pressure side port 6 is accommodated in the gap S. Therefore, in the valve V of this example, contamination can be prevented from being pinched between the valve seat member 4 and the inner peripheral side of the compression side leaf valve 9, and generation of abnormal noise due to the pinching and deterioration of damping force characteristics Can be prevented.

  Furthermore, according to this configuration, the annular plate member 10 is stacked on the center side of the pressure side valve seat 21 provided so as to protrude from the valve seat member 4, and the clearance S is formed inside the pressure side valve seat 21. As described above, when the gap S for preventing the pinching of contaminants is formed, machining is extremely easy as compared with the case where both the recess and the through hole are formed in the valve seat member such as the piston as in the related art. Therefore, it is possible to prevent the entrapment of contaminants at low cost and to prevent the generation of abnormal noise and the deterioration of attenuation characteristics.

  Further, in the valve V of the present embodiment, the valve seat member 4 is disposed between the pressure side valve seats 21, and the inlet end is open on the side where the outlet end of the pressure side port 6 is open. A side port 7 is provided, and an annular plate member 10 overlaps the extension side port 7 in an axial view, and is disposed to face the inlet end of the extension side port 7 with a gap.

  According to this configuration, the disc portion of the annular plate member 10 does not flow to the pressure side chamber R2 side at the time of the extension operation of the shock absorber 1 and the contaminant floating in the expansion side port 7 tries to backflow to the expansion side chamber R1 side. Since it hits 11 and the protrusion part 12, a backflow of a contaminant can be suppressed. Further, since the annular plate member 10 and the inlet end of the expansion side port 7 face each other with a gap, the projection 12 does not resist the flow of the liquid passing through the expansion side port 7 .

  Moreover, in this example, as shown in FIG. 3, although the annular plate member 10 has overlapped with all the expansion | extension side ports 7 in the axial direction view, as shown in FIG. 5, FIG. If the axial view of the expansion side port 7 overlaps at least half from the inside, the backflow preventive effect of the contaminant is well exhibited.

  Further, in the present embodiment, as shown in FIG. 4, the tips of the respective projecting portions 12 of the annular plate member 10 are arc-shaped, and the tips of these projecting portions 12 are of the disk portion 11 of the annular plate member 10. It is disposed on the same circumference of a virtual circle centered on the center.

  And although the annular plate member 10 is manufactured in multiple pieces from a large single plate, when the front end of the protrusion 12 is made circular as in this example, a disk-like plate cut out from the single plate is used. Since it can process and manufacture, compared with manufacturing and manufacturing a rectangular-plate-shaped board, many annular board members 10 can be manufactured from the said 1 sheet. However, the shape of the protrusion 12 is not limited to this, and may be, for example, a rectangular plate. The annular plate member 10 may be manufactured by methods other than cutting and processing.

  Further, in the valve V of this example, since the annular plate member 10 has the projecting portions 12 in the circumferential direction in accordance with the distance between the adjacent pressure side valve seats 21, the annular plate The member 10 can be positioned relative to the valve seat member 4. Therefore, the work efficiency of the assembling work of the shock absorber 1 is improved. However, in order to position the annular plate member 10, the protrusions 12 do not have to be disposed between all the pressure side valve seats 21, and only one protrusion 12 is sufficient.

  Further, in the valve V of this example, an annular recess 22 having an axial position lower than the pressure side valve seat 21 and an axial position higher than the low surface portion 13 on the center side of the valve seat member 4. It is formed along the center side. Then, an annular plate member 10 having a disk portion 11 whose outer diameter is smaller than the outer diameter of the recess 22 is fitted in the recess 22, whereby the extension side is made between the disk portion 11 and the recess 22 via the low surface portion 13. A gap S leading to the port 7 is formed.

  According to this configuration, the valve seat member 4 is processed to have the annular recess 22, and the outer diameter of the portion facing the inner side of the pressure side valve seat 21 in the recess 22 is smaller than the outer diameter of the recess 22. The gap S can be formed simply by fitting the member 10. Therefore, the process for providing the clearance S inside the pressure side valve seat 21 can be made easier. Further, since the gap S communicates with the low surface portion 13 and the axial position of the recess 22 is higher than the axial position of the low surface portion 13, the contaminant contained in the gap S is an axis together with the liquid It is easy to flow to the low surface portion 13 side where the direction position is low.

  In this example, although the gap S communicates with the expansion side port 7 via the lower surface portion 13, even if the gap S does not communicate, a contaminant is accommodated in the gap S and the biting of the contaminant occurs. It is prevented. However, as in the present example, when the gap S communicates with the extension port 7 via the lower surface portion 13, the contaminant contained in the gap S is discharged to the extension port 7. There is no risk of contamination.

  Moreover, although the cyclic | annular plate member 10 of this example has the protrusion part 12 in outer periphery, if only the function which forms the clearance gap S is exhibited, the protrusion part 12 is abbreviate | omitted and it forms only with the disk part 11. It may be done.

  Further, in this example, the shock absorber 1 includes a cylinder 2, a rod 3 axially movably inserted into the cylinder 2, and a valve V. The valve V resists the flow of the moving liquid when the cylinder 2 and the rod 3 move relative to each other. And since the said valve V is provided with the clearance gap S as mentioned above, it prevents that a contaminant is pinched between the annular-plate member 10 and the inner peripheral side of the compression side leaf valve 9, and the noise from the said pinching And the deterioration of damping force characteristics can be prevented. Therefore, in the shock absorber 1 of the present example, the use of the valve V can generate a desired damping force.

  The configurations of the valve V and the shock absorber 1 are not limited to the above, and can be changed as appropriate. For example, in the valve V, since the pressure side port 6 is an independent port that the windows 4 d of the pressure side ports 6 adjacent to each other do not communicate, the annular plate member 10 is stacked on the expansion side chamber R1 side of the valve seat member 4 ing. Therefore, when the expansion side port 7 is an independent port, the annular plate member 10 may be stacked on the pressure side chamber R2 side of the valve seat member 4 to form the gap S.

  In the present embodiment, the valve V is realized in the piston portion of the shock absorber 1, but the position where the valve V is provided is not limited to the piston portion. For example, valves other than the piston portion such as the base valve of the shock absorber May be used for

  While the preferred embodiments of the present invention have been described above in detail, it goes without saying that modifications, variations and changes can be made without departing from the scope of the claims.

Reference Signs List 1: shock absorber 2: cylinder 3: rod 4: valve seat member 6: extension side port (second port) 7: pressure side port (first port 9) Pressure side leaf valve, 10: annular plate member, 11: disk portion, 13: low surface portion, 21: pressure side valve seat, 22: recessed portion, S: Gap, V ... valve

Claims (5)

An annular valve seat member having a plurality of first ports circumferentially arranged side by side;
A plurality of valve seats provided to project from the valve seat member and surrounding the outlet end of each of the first ports;
An annular plate member stacked on the center side of the valve seat member to form a gap between each of the valve seats.
A valve provided with a leaf valve, the center side of which is stacked on the annular plate member and the outer side of which is seated on the valve seat to open and close the first port. The valve seat member is disposed between the respective valve seats, and has a plurality of second ports opened at the inlet end on the side where the outlet end of the first port is open, and in communication with the gap.
The annular plate member overlaps with the second port in an axial view, and is disposed to face the inlet end of the second port at an interval. Valve. The valve according to claim 2, wherein the annular plate member overlaps the second port in an axial direction as viewed in the axial direction. The valve seat member is
A lower surface portion formed between the adjacent valve seats and provided with the second port;
The valve seat member has an annular recess formed along the center side of the valve seat and having an axial position lower than the valve seat and higher than the low surface portion.
The annular plate member has a disk portion whose outer diameter is smaller than the outer diameter of the recess, and by being fitted into the recess, the lower surface portion is interposed between the disk portion and the valve seat. The valve according to claim 2 or 3, wherein the gap leading to two ports is formed. With the cylinder,
A rod axially movably inserted into the cylinder;
The valve according to any one of claims 1 to 4;
The shock absorber characterized in that the valve resists the flow of moving liquid when the cylinder and the rod move relative to each other.

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