JP2011149447A - Valve structure for shock absorber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a valve structure for a shock absorber, enabling separate setting of damping force characteristics on both elongating pressure sides, while permanently developing the damping force characteristics as designed and reducing the cost. <P>SOLUTION: The valve structure for the shock absorber includes a valve disc 1 having ports 4, 5 communicated with one chamber 41 and the other chamber 42 formed in the shock absorber and annular valve seats 6, 7 encircling the outlet ends of the ports 4, 5, respectively, and annular leaf valves 2, 3 stacked on the valve disc 1 for opening/closing the ports 4, 5, respectively. With check valves 8, 9 where inner rings 82, 92 having outer diameters smaller than the inner diameters of the valve seats and outer rings 83, 93 to be seated on/off the valve seats 6, 7 are formed by C-type annular cutouts 81, 91, respectively, flow paths having orifices formed in the leaf valves are opened/closed. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an improved valve structure of a shock absorber.

  Conventionally, this type of valve structure is embodied in, for example, a piston portion of a hydraulic shock absorber for a vehicle, and includes a piston that separates two pressure chambers in the shock absorber, and an extension provided on the piston. An annular extension leaf valve seated on an annular valve seat disposed on the outer periphery of the side port, and an annular pressure side leaf valve seated on the annular valve seat disposed on the outer periphery of the pressure side port provided on the piston. When the shock absorber is extended, the expansion side leaf valve provides resistance to the flow of hydraulic fluid that passes through the expansion side port to exert the expansion side damping force. When the shock absorber contracts, the compression side leaf valve passes through the compression side port. It exerts a damping force by giving resistance to the flow of hydraulic oil.

  Further, in the valve structure, an orifice formed by a notch provided in the expansion-side and pressure-side annular valve seats, or a notch provided in the outer periphery of each of the extension-side and pressure-side leaf valves in contact with the annular valve seats. The hydraulic oil is allowed to pass through the orifice until each leaf valve reaches a valve opening pressure at which the leaf valve separates from the annular valve seat.

  By configuring the valve structure as described above, when the piston speed is low, a damping force characteristic (a characteristic of a change in the damping force with respect to the piston speed) that is a square characteristic peculiar to the orifice where the damping force rises is obtained. However, since the orifice always keeps the two pressure chambers in communication with each other, regardless of whether the shock absorber is in the expansion stroke or the contraction stroke, the annular valve seat on the expansion side and the compression side or each leaf valve on the expansion side and the pressure side Since the hydraulic oil passes through both orifices provided in the above, the damping force characteristics when the piston speed is low are the same during the expansion stroke and during the contraction stroke, and the damping force characteristics can be set individually. Can not.

  In order to solve this, the leaf valve is composed of three discs, the middle leaf valve is provided with a notch that opens from the outer periphery, the leaf valve on the valve seat side is provided with an opening that leads to the notch provided in the middle leaf valve, A valve structure has been proposed in which a disk for opening and closing an opening is provided between a leaf valve on the valve seat side and a piston (see, for example, Patent Documents 1 and 2).

Japanese Utility Model Publication No. 61-37881 JP 2004-125023 A

  However, in the proposed valve structure as described above, it is necessary to set the outer diameter of the disk to be smaller than the inner diameter of the valve seat, and for the convenience of inserting the disk between the leaf valve and the piston. The valve seat is projected in the axial direction by the thickness of the disc from the inner seat portion where the inner circumference of the disc in the piston is seated, or there is no ring that is centered by the disc and seated on the valve seat on the outer circumference of the disc must not.

  And when projecting the valve seat in the axial direction by the thickness of the disc from the inner peripheral seat portion, the axial height dimension of the inner peripheral seat portion and the valve seat must be managed with high accuracy, and the piston Processing is difficult and processing costs increase.

  In addition, when a ring is provided on the outer periphery of the disc, the axial height of the inner peripheral seat portion and the valve seat can be made the same, so the processing is easy, but the disc is bent and the leaf valve opening is opened. Then, the ring is in a free state that is not aligned by the disc, so when the disc returns, the ring is caught between the disc and the leaf valve so that the opening cannot be closed, and the designed damping force characteristics are exhibited. It may not be possible.

  Therefore, the present invention was devised to improve the above-described problems, and the object of the present invention is to set damping force characteristics separately on both sides of the pressure-stretching, and to permanently set the damping force characteristics as designed. It is an object of the present invention to provide a shock absorber valve structure that can be effectively realized and can reduce costs.

  In order to solve the above-described object, the problem-solving means in the present invention includes a port formed in the shock absorber and communicating with one chamber and the other chamber, and an annular valve seat surrounding the outlet end of the port. A shock absorber valve structure including a valve disk and an annular leaf valve stacked on the valve disk to open and close a port, and an inner ring having an outer diameter smaller than the inner diameter of the valve seat by an annular C-shaped notch A check valve having an outer ring formed on and off the valve seat is interposed between the leaf valve and the valve disk, and the leaf valve is stacked on the check valve and opened and closed by the inner ring of the check valve. A through-hole leaf valve having a hole and having an outer peripheral portion in contact with the outer ring, a communication hole stacked on the through-hole leaf valve and communicating with the through-hole, and opening from the outer periphery to the communication hole And the notch leaf valve having a notch orifice, characterized in that a lid leaf valve to cover at least the communication hole of the notched leaf valve is laminated on the notch leaf valve.

  According to the valve structure of the shock absorber of the present invention, the damping force characteristic can be set separately on both sides of the pressure expansion, the check valve has a C-shaped notch, and an inner ring and an outer ring are formed by the notch. Since the inner ring opens and closes the leaf valve through-hole with respect to the outer ring, there is no need to have a difference in the axial height between the inner peripheral seat portion of the valve disc and the valve seat. The disk can be easily processed and the processing cost is reduced.

  Furthermore, since the inner ring and the outer ring are not separate and independent parts, the outer ring is not misaligned with respect to the inner ring, and even if the inner ring repeatedly bends, It can permanently exhibit the designed damping force characteristics without biting the ring.

  Furthermore, in the valve structure of the shock absorber according to the present invention, the damping force characteristics can be set separately on both sides of the pressure expansion, so that the shock absorber exerts the damping force with the appropriate damping force characteristics in the expansion stroke and the contraction stroke. Therefore, the present invention is suitable for applications that require different damping force characteristics in the extension stroke and the contraction stroke, and is particularly suitable for a vehicle shock absorber, thereby improving the ride comfort in the vehicle.

It is a longitudinal cross-sectional view of the piston part of the shock absorber in which the valve structure of the shock absorber in one embodiment is embodied. It is an exploded top view of the leaf valve and check valve in the valve structure of the buffer of one embodiment. It is the figure which showed the damping force characteristic of the buffer which embodied the valve | bulb structure of the buffer of one Embodiment.

  Hereinafter, the valve structure of the shock absorber according to the present invention will be described with reference to the drawings. As shown in FIG. 1, the valve structure of the shock absorber in one embodiment is embodied in a damping valve on the expansion side and the pressure side of the piston portion of the shock absorber, and includes a one chamber 41 formed in the shock absorber. The expansion side port 4 and the compression side port 5 as ports communicating with the other chamber 42, and the annular expansion side valve seat 6 and the annular pressure side valve as valve seats surrounding the outlet ends of the expansion side port 4 and the compression side port 5, respectively. Piston 1 as a valve disc provided with a seat 7, extension side leaf valve 2 as a leaf valve stacked on the other chamber 42 side of the piston 1 to open and close the extension side port 4, and one chamber 41 side of the piston 1 , A pressure side leaf valve 3 as a leaf valve that opens and closes the pressure side port 5, a pressure side check valve 8 interposed between the extension side leaf valve 2 and the piston 1, and a pressure side leaf valve 3. It is constituted by a extension side check valve 9 interposed between the piston 1.

  On the other hand, a shock absorber in which the valve structure is embodied is well known and will not be described in detail, but specifically, for example, a cylinder 40 and a head member (not shown) that seals the upper end of the cylinder 40. ), A piston rod 10 slidably passing through a head member (not shown), and a slidably inserted into the cylinder 40 to partition the cylinder 40 into one chamber 41 and the other chamber 42, and a piston The piston 1 as a partition member fixed to the tip 10 a of the rod 10, a sealing member (not shown) that seals the lower end of the cylinder 40, and the cylinder internal volume corresponding to the volume of the piston rod 10 protruding and retracting from the cylinder 40 A cylinder or an air chamber (not shown) that compensates for the change is provided, and the cylinder 40 is filled with a fluid, specifically, hydraulic oil. In addition, as fluid, it is also possible to utilize liquids and gases other than hydraulic oil.

  In the valve structure, in the expansion stroke of the shock absorber in which the piston 1 moves upward in FIG. 1 with respect to the cylinder 40, the compression chamber is connected to the other chamber 42 via the expansion side port 4. When the hydraulic oil moves, a damping force is generated by causing the expansion side leaf valve 2 to resist the flow of the hydraulic oil and causing a predetermined pressure loss to generate a predetermined expansion side damping force in the shock absorber. In the contraction stroke of the shock absorber in which the piston 1 moves downward in FIG. 1 with respect to the cylinder 40, the hydraulic oil moves from the other chamber 42 to be compressed to the one chamber 41 via the compression side port 5. At this time, the pressure side leaf valve 3 gives resistance to the flow of the hydraulic oil to cause a predetermined pressure loss, and functions as a damping force generating element that generates a predetermined pressure side damping force in the shock absorber.

  Hereinafter, the valve structure will be described in detail. The piston 1 as a valve disk is formed in an annular shape, and allows the hydraulic oil to pass from the one chamber 41 to the other chamber 42, so that the outlet ends are on the same circumference. A plurality of expansion side ports 4 arranged on the same side, and conversely, allowing the hydraulic oil to pass from the other chamber 42 to the one chamber 42 and allowing the outlet end to be arranged on the same circumference, the piston 1 The expansion side window 13 as an annular window formed at the end facing the other chamber 42 side and continuing to the outlet end of each expansion side port 4 and the end side facing the one chamber 41 side of the piston 1 and each pressure side The pressure side window 14 as an annular window connected to the outlet end of the port 5 and the end portion facing the other chamber 42 side of the piston 1 are arranged on the outer periphery from the extension side window 13 and are arranged at the outlet end of each extension side port 4. An annular extension valve seat 6 surrounding the outer periphery, and a piston 1 On the other hand and an annular compression-side valve seat 7 formed on the end facing the chamber 41 side are arranged on the outer circumference than the compression side window 14 surrounding an outer periphery of the outlet end of the compression side port 5.

  In addition, as long as the exit end of the extension side port 4 is arrange | positioned in the extension side window 13, these exit ends do not necessarily need to be arrange | positioned on the same periphery. Moreover, since the outlet end of the pressure side port 5 should just be similarly arrange | positioned in the pressure side window 14, these do not need to be arrange | positioned on the same periphery.

  Further, in the case of this embodiment, the open end of the expansion side port 4 is arranged on the outer peripheral side from the pressure side valve seat 7 so as not to be blocked by the pressure side leaf valve 3 stacked on the one chamber 41 side of the piston 1. In addition, the open end of the compression side port 5 is arranged on the outer peripheral side of the extension side valve seat 6 so as not to be blocked by the extension side leaf valve 2 stacked on the other chamber 42 side of the piston 1. In the case of this embodiment, the expansion side port 4 and the compression side port 5 are provided in an inclined posture with respect to the axial direction of the piston 1, but the expansion side port 4 is not closed by the compression side leaf valve 3, and the compression side port 4 If the port 5 is not blocked by the expansion side leaf valve 2, the arrangement and shape of the port 5 are not limited to those illustrated, and the number of the expansion side port 4 and the compression side port 5 may be one or more. Any number may be provided.

  As described above, the tip 10a of the piston rod 10 of the shock absorber is inserted into the inner peripheral side of the piston 1, and the tip 10a of the piston rod 10 is protruded downward in FIG. Further, the outer diameter of the tip 10a of the piston rod 10 is set to be smaller than the outer diameter on the upper side in FIG. 1 from the tip 10a, and a step portion 10b is formed at a portion where the outer diameters of the upper side and the tip 10a are different. Yes.

  A pressure-side check valve 8 is stacked on the other chamber 42 side, which is the lower side of the piston 1 in FIG. 1, and the extension-side leaf valve 2 is stacked on the check valve 8. The check valve 8 is annular and includes a C-shaped notch 81, and the notch 81 is attached to and detached from the inner ring 82 having an outer diameter smaller than the inner diameter of the extension side valve seat 6 and the extension side valve seat 6. An outer ring 83 is formed. The outer ring 83 is stacked in a state of being seated on the extension side valve seat 6, and the inner ring 82 is stacked in a state of being seated on an inner peripheral seat portion 1 a provided on the inner periphery of the piston 1.

  The check valve 8 is mounted on the outer periphery of the tip 10 a of the piston rod 10, the inner peripheral side is fixed to the piston rod 10, and the outer peripheral side is allowed to bend, and the inner ring 82 is connected to the outer ring 83. The outer ring 83 can be bent independently except for the periphery of the connecting portion 84. Further, since the inner ring 82 is provided with the extension side window 13, the inner ring 82 can be freely bent upward in FIG.

  As shown in FIG. 2, the extension-side leaf valve 2 includes a through hole 21 a that is stacked on the check valve 8 and is opened and closed by an inner ring 82 of the check valve 8, and an outer peripheral portion abuts on the outer ring 83. A cut-out leaf valve including a through-hole leaf valve 21, a communication hole 22 a that is stacked on the through-hole leaf valve 21 and communicates with the through-hole 21 a, and a cut-out orifice 22 b that opens from the outer periphery and communicates with the communication hole 22 a. 22 and a lid leaf valve 23 that is stacked on the notch leaf valve 22 and covers at least the communication hole 22a of the notch leaf valve 22. Specifically, the outer diameter of the through-hole leaf valve 21 is set to be greater than or equal to the outer diameter of the check valve 8, and the outer ring 82 of the check valve 8 is sandwiched together with the extended valve seat 6.

  Three through-holes 21a in the above-mentioned through-hole leaf valve 21 are provided on the same circumference, and are arc-shaped long holes that follow the circumferential direction. In addition, four communication holes 22a in the cutout orifice 22 are provided on the same circumference where the through hole 21a is provided, and are formed as arc-shaped long holes that follow the circumferential direction. When the cutout leaf valve 22 is overlapped, the through hole 21a and the communication hole 22a wrap on the same circumference so that a large lap area can be secured. The number of the through holes 21a and the communication holes 22a can be set arbitrarily. The lap area of the through hole 21a and the communication hole 22a is at least larger than the flow path area of the notched orifice 22b.

  Further, like the check valve 8, the extension side leaf valve 2 is fixed to the tip 10 a of the piston rod 10 on the inner peripheral side, and is allowed to bend on the outer peripheral side.

  The extension side leaf valve 2 includes a sub leaf valve 24 stacked on the anti-piston side in addition to the above-described leaf valves 21, 22, and 23, and the sub leaf valve 24 uses the extension side leaf valve 2. However, if it is not necessary, the sub leaf valve 24 may be omitted, and the number of outer diameters and the outer diameter of each leaf valve constituting the sub leaf valve 24 may be arbitrarily set. Can be set to

  Then, when the through-hole leaf valve 21, the cut-out orifice 22 and the cut-out leaf valve 23 are stacked on the check valve 8, the through-hole 21a of the through-hole leaf valve 21 and the communication hole 22a of the cut-out leaf bubble 22 are communicated to face each other. Further, the through-hole leaf valve 21 and the lid leaf valve 23 open only the open end of the cut-out orifice 22b in the cut-out orifice 22b, and the flow path P1 is formed by the cut-out orifice 22b, the communication hole 22a, and the through-hole 21a. Is formed. The fluid passing through the flow path P1 is given resistance by the cutout orifice 22b.

  In addition, the check valve 8 is laminated on the side surface of the piston 1 of the through-hole leaf valve 21, and the inner ring 82 in the state where the inner ring 82 of the check valve 8 is not bent and contacts the through-hole leaf valve 21. When the inner ring 82 is bent by receiving pressure from the flow path P1 side, the through hole 21a can be opened. .

  On the other hand, on the one chamber 41 side which is the upper side in FIG. 1 of the piston 1, an extension side check valve 9 is laminated, and a pressure side leaf valve 3 is laminated on the check valve 9. The check valve 9 is annular and includes a C-shaped notch 91, and an inner ring 92 having an outer diameter smaller than the inner diameter of the pressure side valve seat 7 by the notch 91 and an outer ring that is attached to and detached from the pressure side valve seat 7. 93 is formed. The outer ring 93 is stacked in a state of being seated on the pressure side valve seat 7, and the inner ring 92 is stacked in a state of being seated on an inner peripheral seat portion 1 b provided on the inner periphery of the piston 1.

  The check valve 9 is mounted on the outer periphery of the tip 10 a of the piston rod 10, the inner peripheral side is fixed to the piston rod 10, and the outer peripheral side is allowed to be bent, and the inner ring 92 is connected to the outer ring 93. The outer ring 93 can be bent independently except for the periphery of the connecting portion 94. Further, since the inner ring 92 is provided with the compression side window 14, the inner ring 92 can be freely bent downward in FIG.

  As shown in FIG. 2, the compression-side leaf valve 3 is also provided with a through hole 31a stacked on the check valve 9 and opened and closed by an inner ring 92 of the check valve 9, as shown in FIG. A through-hole leaf valve 31 having a portion in contact with the outer ring 93, a communication hole 32a stacked on the through-hole leaf valve 31 and communicating with the through-hole 31a, and a notch communicating from the outer periphery to the communication hole 32a A notch leaf valve 32 having an orifice 32b and a lid leaf valve 33 stacked on the notch leaf valve 32 and covering at least the communication hole 32a of the notch leaf valve 32 are provided. Specifically, the outer diameter of the through-hole leaf valve 31 is set to be equal to or larger than the outer diameter of the check valve 9, and the outer ring 92 of the check valve 89 is held together with the pressure side valve seat 7.

  Three through-holes 31a in the above-mentioned through-hole leaf valve 31 are provided on the same circumference, and are arc-shaped long holes that follow the circumferential direction. Further, four communication holes 32 a in the cutout orifice 32 are provided on the same circumference where the through hole 31 a is provided, and are formed as arc-like long holes that follow the circumferential direction. When the cutout leaf valve 32 is overlapped, the through hole 31a and the communication hole 32a wrap on the same circumference, so that a large lap area can be secured. The number of the through holes 31a and the communication holes 32a can be set arbitrarily. The lap area of the through hole 31a and the communication hole 32a is at least larger than the flow path area of the notched orifice 32b.

  Further, like the check valve 9, the pressure side leaf valve 3 is fixed to the tip 10a of the piston rod 10 on the inner peripheral side, and is allowed to bend on the outer peripheral side.

  The pressure-side leaf valve 3 includes a sub-leaf valve 34 that is stacked on the non-piston side in addition to the above-described leaf valves 31, 32, and 33, and the sub-leaf valve 34 bends the pressure-side leaf valve 3. Although the rigidity can be adjusted, if not required, the sub leaf valve 34 may be omitted, and the number of outer diameters and the outer diameter of each leaf valve constituting the sub leaf valve 34 may be arbitrarily set. can do.

  Then, when the through-hole leaf valve 31, the cutout orifice 32, and the cutout leaf valve 33 are stacked on the check valve 9, the through-hole 31a of the through-hole leaf valve 31 and the communication hole 32a of the cutout leaf bubble 32 are communicated to face each other. Further, the through-hole leaf valve 31 and the lid leaf valve 33 open only the opening end of the cut-out orifice 32 in the cut-out orifice 32b, and the flow path P2 is formed by the cut-out orifice 32b, the communication hole 32a, and the through-hole 31a. Is formed. The fluid passing through this flow path P2 is given resistance by the cutout orifice 32b.

  In addition, the check valve 9 is laminated on the side surface of the piston 1 of the through-hole leaf valve 31, and the inner ring 92 of the check valve 9 is not bent and contacts the through-hole leaf valve 31. When the inner ring 92 is bent by receiving pressure from the flow path P2 side, the through hole 31a can be opened. .

  As described above, the check valves 8 and 9, the extension side leaf valve 2 and the pressure side leaf valve 3, and the sub leaf valves 24 and 34 are laminated on the one chamber 41 side and the other chamber 42 side of the piston 1, and these members Is assembled to the tip 10a of the piston rod 10 and is clamped by a piston nut 15 screwed into a screw groove 10c provided at the tip 10a and a step 10b of the piston rod 10 and fixed to the piston rod 10. .

  Next, the operation of the valve structure configured as described above will be described. First, when the shock absorber is in the extension stroke and the piston 1 moves upward in FIG. 1 with respect to the cylinder 40, the pressure in the one chamber 41 increases, and the hydraulic oil in the one chamber 41 moves into the other chamber 42. try to. In this case, since the pressure in the one chamber 41 exceeds the pressure in the other chamber 42, the pressure in the one chamber 41 passes through the flow path P <b> 2 formed in the compression side leaf valve 3 and the inside of the check valve 9 on the extension side. Since it acts on the ring 92 and bends it downward in FIG. 1, the flow path P2 is opened.

  Further, when the piston speed is low and the expansion side leaf valve 2 is maintained in a state where the expansion side port 4 is closed without being bent, the hydraulic oil is supplied to the one chamber 41 via the flow path P2 and the compression side port 5. The notched orifice 32b functions as a throttle to provide resistance against the flow of hydraulic oil. The pressure side check valve 8 is urged toward the expansion side leaf valve 2 by the pressure in the one chamber 41 acting via the expansion side port 4 and closes the through hole 21a, so that the flow path P1 is blocked. Maintained. As described above, even if pressure is applied to the check valve 8, since the whole is supported by the extension-side leaf valve 2, even if the check valve 8 is thinned, plastic deformation does not occur. In other words, the check valve 8 can be made thin, and the valve opening pressure of the check valve 8 can be set small. This also applies to the check valve 9 on the expansion side, so that the valve opening pressure of the check valve 9 can be reduced, and an extra resistance is not given to the flow of hydraulic oil passing through the flow path P2. be able to.

  When the piston speed, which is the extension speed of the shock absorber, rises and the differential pressure between the one chamber 41 and the other chamber 42 reaches the valve opening pressure of the expansion side leaf valve 2, the expansion side leaf valve 2 becomes the compression side check valve 8. At the same time, it bends away from the expansion side valve seat 6, and the hydraulic oil also passes through the gap between the expansion side leaf valve 2 and the expansion side valve seat 6.

  Therefore, the extension side damping force characteristic until the extension side leaf valve 2 is opened during the extension stroke of the shock absorber is characterized only by the notch orifice 32b provided in the compression side leaf valve 3, as shown in FIG. become.

  Conversely, when the shock absorber is in the contraction stroke and the piston 1 moves downward in FIG. 1 with respect to the cylinder 40, the pressure in the other chamber 42 increases, and the hydraulic oil in the other chamber 42 enters the one chamber 41. Try to move. In this case, since the pressure in the other chamber 42 exceeds the pressure in the one chamber 41, the pressure in the other chamber 42 passes through the flow path P <b> 1 formed in the expansion side leaf valve 2 and the pressure side check valve 8. Since it acts on the ring 82 and bends it upward in FIG. 1, the flow path P1 is opened. Further, when the piston speed is low and the pressure side leaf valve 3 is not bent and the pressure side port 5 is kept closed, the hydraulic oil is passed from the other chamber 42 via the flow path P1 and the extension side port 4. On the other hand, it moves to the chamber 41, and the cutout orifice 22b functions as a throttle to give resistance to the flow of the hydraulic oil. The extension side check valve 9 is urged toward the pressure side leaf valve 3 by the pressure in the other chamber 42 acting via the pressure side port 5 and closes the through hole 31a, so that the flow path P2 is blocked. Maintained.

  When the piston speed, which is the extension speed of the shock absorber, increases and the differential pressure between the other chamber 42 and the one chamber 41 reaches the valve opening pressure of the compression side leaf valve 3, the compression side leaf valve 3 and the extension side check valve 9 together. The hydraulic oil is bent and separated from the pressure side valve seat 7, and the hydraulic oil passes through the gap between the pressure side leaf valve 3 and the pressure side valve seat 7.

  Therefore, the extension side damping force characteristic until the compression side leaf valve 3 is opened during the contraction stroke of the shock absorber is characterized only by the notch orifice 22b provided in the extension side leaf valve 2, as shown in FIG. become.

  In the present embodiment, the valve opening pressures of the expansion side leaf valve 2 and the compression side leaf valve 3 are different, and the damping force at the time of opening is different depending on the expansion pressure. The valve opening pressure of the pressure side leaf valve 3 may be set arbitrarily. Similarly, the piston speed at the time of opening of the extension side leaf valve 2 and the pressure side leaf valve 3 may be set to be different as in the present embodiment, or may be set to be the same. Good.

  As described above, according to the valve structure of the shock absorber in the present embodiment, the damping force characteristics can be set separately on both sides of the pressure expansion. In the valve structure of the shock absorber in the present embodiment, the check valves 8 and 9 are provided with C-shaped notches 81 and 91, and the inner rings 82 and 92 and the outer ring 83 are formed by the notches 81 and 91. 93, and the inner rings 82, 92 open and close the flow paths P1, P2 formed in the leaf valves 2, 3 with respect to the outer rings 83, 93. It is not necessary to make a difference in the axial height between the inner peripheral seat portions 1a, 1b of the piston 1 and the valve seats 6, 7 on the expansion side and the compression side, and the processing of the piston 1 as a valve disk becomes easy and the processing cost is reduced. Is also reduced.

  Furthermore, since the inner rings 82 and 92 and the outer rings 83 and 93 are not separate and independent parts but are integrated with each other at the connecting portions 84 and 94, the outer rings 83 and 93 are connected to the inner rings 82 and 92. There is no misalignment, and even if the inner rings 82 and 92 are repeatedly bent, the outer rings 83 and 93 are not caught and the damping force characteristics as designed can be exhibited permanently.

  Furthermore, in the shock absorber valve structure of the present embodiment, the damping force characteristic can be set separately on both sides of the pressure expansion, so that the damping force is applied to the shock absorber with an appropriate damping force characteristic in the expansion stroke and the contraction stroke. The present invention is suitable for applications that require different damping force characteristics in the expansion stroke and the contraction stroke, and is particularly suitable for a vehicle shock absorber, thereby improving the riding comfort in the vehicle.

  In the above description, the case where the valve structure is embodied as a damping valve on both sides of the pressure expansion has been described as an example. However, the valve structure may be embodied as a damping valve only on the expansion side or only on the pressure side. . This is because, for example, even when the valve structure is embodied only in the expansion-side damping valve, the flow path P1 is closed by the check valve 8 during the expansion stroke of the shock absorber, and the check valve during the contraction stroke. Since the valve 8 opens to open the flow path P1, the damping force characteristic can be set separately on both sides of the pressure increase by setting the notch orifice 22b. Therefore, even if the valve structure of the shock absorber is embodied as a damping valve only on the expansion side or only on the compression side, the damping force characteristics can be set separately on both sides of the expansion.

  In the above description, the valve structure of the present invention has been described using an example embodied in the damping valve of the piston portion of the shock absorber. However, the shock absorber of the double cylinder type in which the shock absorber has a reservoir outside the cylinder. When the base valve is provided, the valve structure of the present invention can be embodied in the damping valve of the base valve portion, and the buffer functioning as a damping force generating element that generates a damping force. Of course, it can be applied to the valve of the vessel. That is, when the valve structure is embodied in the damping valve of the base valve portion, one chamber may be one of the piston side chamber or the reservoir chamber and the other chamber may be the other of the piston side chamber or the reservoir chamber. Furthermore, the valve structure can be embodied in both the damping valve of the piston portion of the shock absorber and the damping valve of the bale valve portion.

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

The present invention is applicable to a shock absorber valve.

DESCRIPTION OF SYMBOLS 1 Piston 1a, 1b as a valve disc 2 Inner-periphery seat part 2 Leaf side leaf valve 21, 31 as a leaf valve Leaf valve 21a, 31a Through hole 22, 32 Notched leaf valve 22a, 32a Communication hole 22b, 32b Notched orifice 23, 33 Lid leaf valve 24, 34 Sub leaf valve 3 Pressure side leaf valve 4 as leaf valve Extension side port 5 as port Pressure side port 6 as port 6 Extension side valve seat 7 as valve seat Pressure side valve seat as valve seat 8, 9 Check valve 81, 91 Notch 82, 92 Inner ring 83, 93 Outer ring 84, 94 Connection portion 10 Piston rod 10a Piston rod tip 10b Piston rod step portion 10c Piston rod screw portion 13 Extension as an annular window Side window 14 Pressure side window 15 as an annular window Piston nut 41 One chamber 4 2 Other chamber P1, P2 flow path

Claims (2)

A valve disk having a port formed in the shock absorber and communicating with one chamber and the other chamber, an annular valve seat surrounding the outlet end of the port, and an annular leaf stacked on the valve disk to open and close the port In a valve structure of a shock absorber provided with a valve, a check valve in which an annular inner ring having an outer diameter smaller than the inner diameter of the valve seat by an C-shaped notch and an outer ring that is attached to and detached from the valve seat is formed as a leaf A through hole that is interposed between the valve and the valve disk, has a through hole that is stacked on the check valve and is opened and closed by the inner ring of the check valve, and has an outer peripheral part in contact with the outer ring. A notch leaf valve having a leaf valve, a communicating hole stacked on the through-hole leaf valve and communicating with the through-hole, and a notched orifice opening from the outer periphery to the communicating hole; and a notched leaf valve Valve structure of the damper, characterized in that a lid leaf valve to cover at least the communication hole of the notched leaf valve laminated on. A plurality of through holes in the through hole leaf valve are provided on the same circumference, and are arc-shaped long holes that follow the circumferential direction, and the communication holes in the cutout orifice are on the same circumference in which the through holes are provided. The shock absorber valve structure according to claim 1, wherein a plurality of arc-shaped elongated holes are provided along the circumferential direction.

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