JP2005069423A - Valve structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a valve structure capable of generating stable damping force. <P>SOLUTION: A rod 31 mounted on a valve body 4 is slidably inserted into a hole 19 formed on an axial center part of a valve disc 10, and a cylindrical part 13 of the valve disc 10 is slidably inserted into an inner periphery of an annular leaf valve 30, whereby the horizontal displacement of the annular leaf valve 30 to a first seat face 16 and a second seat face 8 is prevented, and the stable damping force can be generated. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a valve structure, and more particularly to an improvement of a valve structure of a shock absorber that generates a predetermined damping force during compression.

Conventionally, in a valve structure that generates a damping force by bending the inner peripheral side of this kind of annular leaf valve, for example, what is embodied in the base valve portion of the shock absorber, for example, in the valve body It is known that a bottomed cylindrical valve case that accommodates a valve disc and an annular leaf valve is fitted. Specifically, a seat surface that supports the lower surface of the outer periphery of the annular leaf valve is formed on the valve body. An annular leaf valve is seated on the seat surface, the valve disc is brought into contact with the upper surface of the annular leaf valve, and the annular leaf valve is mounted on the valve body together with the valve disc by a biasing spring interposed between the valve disc and the valve case. Further, a projection is provided on the upper surface of the valve disc, and a hole is provided in the bottom of the valve case. It is fitted. That is, the displacement of the valve case is prevented by being fitted to the valve body, and the displacement of the valve disk is restricted by fitting the protrusion of the valve disc into the hole of the valve case. Therefore, the displacement of the valve disc with respect to the valve body is restricted. (For example, refer to Patent Document 1).
JP 2001-59536 A (from page 3, right column, line 36 to page 47, right column, line 47, FIG. 3)

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

  That is, in the conventional valve structure, there is a gap between the outer periphery of the annular leaf valve and the inner periphery of the valve case, and the annular leaf valve is biased toward the valve body by a biasing spring through the valve disk. Therefore, when the shock absorber is compressed, the annular leaf valve is bent on its inner peripheral side to open the flow path through which the hydraulic oil of the shock absorber passes, and then is restored to its original shape and the valve disk The flow path is blocked by sitting on the head, but the position may be displaced in the horizontal direction while repeating the above bending and restoration.

  As described above, the displacement of the annular leaf valve is a displacement of the valve body with respect to the seat surface, so that the fulcrum of deflection on the inner peripheral side of the annular leaf valve is displaced.

  Then, the displacement of the fulcrum of deflection changes the damping force generated by the shock absorber, and the position of the annular leaf valve is displaced in the horizontal direction while it repeatedly bends and restores. Since the damping force will change inside, there is a possibility that the damping force generated by the shock absorber will vary, leading to a problem that it is not stable.

  Accordingly, the present invention has been developed to improve the above-described adverse effects, and an object of the present invention is to provide a valve structure capable of generating a stable damping force.

  In order to solve the above-described object, the valve structure in the first problem solving means of the present invention includes a valve disk, an annular leaf valve, and a valve body, and a shock absorber that generates a predetermined damping force when contracted. In the valve structure, the valve disc includes a valve disc main body, an annular first seat surface provided on a lower surface of the valve disc main body, a cylindrical portion depending from an inner peripheral end of the first seat surface, and a cylindrical portion And a hole penetrating the axial center portion of the valve disc. The valve body includes a valve body main body and an annular second seat surface provided on the upper surface of the valve body main body. It consists of a rod that rises from the axial center of the valve body upper surface, and the cylindrical part of the valve disc is slidably inserted into the inner periphery of the annular leaf valve. Is seated on the first seat surface, the rod of the valve body is slidably inserted into the hole of the valve disc, and the lower surface of the annular leaf valve is seated on the second seat surface. .

  Further, the valve structure in the second problem solving means is the same as that in the first problem solving means, in which a bottomed cylindrical valve case for accommodating the valve disk and the annular leaf valve is provided on the inner side, and the opening end side of the valve case is provided. Is fitted on the valve body on the upper surface side and on the outer peripheral side from the second seat surface, and the valve disk is provided with a protruding portion that rises from the axial center of the upper surface of the valve disk body, with one end on the outer periphery of the protruding portion. A coil spring to be fitted is interposed between the bottom of the valve case and the valve body, and the coil spring biases the valve disc and the annular leaf valve toward the valve body.

  A valve structure in a third problem solving means includes a valve disk, an annular leaf valve, and a valve body, and a valve structure of a shock absorber that generates a predetermined damping force when contracted. And an annular first seat surface provided on the lower surface of the valve disk main body, and a hole penetrating the axial center portion of the valve disk. The valve body is formed on the upper surface of the valve body main body and the valve body main body. It is composed of an annular second seat surface provided and a rod standing from the axial center of the upper surface of the valve body main body, and is provided with a bottomed cylindrical valve case that houses a valve disk and an annular leaf valve inside, The opening end side of the valve case is fitted to the upper surface side of the valve body and to the outer peripheral side from the second seat surface, and the annular leaf valve is fitted to the inner periphery of the valve case. The circumference of the annular leaf valve is slidably inserted, the rod of the valve body is slidably inserted into the hole of the valve disc, and the inner circumferential upper surface of the annular leaf valve is seated on the first seat surface. The outer peripheral side lower surface is seated on the second seat surface.

  In the valve structure in the fourth problem solving means, in the third problem solving means, the valve disk is provided with a protrusion standing from the axial center portion of the upper surface of the valve disk main body, and one end is fitted on the outer periphery of the protrusion. A coil spring is interposed between the bottom of the valve case and the valve body, and the coil spring biases the valve disc and the annular leaf valve toward the valve body.

  According to the invention of each claim, since the fulcrum of deflection of the annular leaf valve does not shift during expansion and contraction of the shock absorber, the generated damping force is always constant if the pressure load is the same. Therefore, unlike the conventional valve structure, a stable damping force can be generated without causing variations in the generated damping force.

  Furthermore, with a slight design change to the existing valve structure, for example, for the conventional valve structure, a cylindrical part, notch and hole are provided in the valve disc, and the valve body is slidably inserted into the hole. Since a stable damping force can be generated only by providing the rod to be manufactured, there is also an advantage that it can be manufactured without making a major change in the manufacturing process.

  In addition, when the above members constituting the valve structure are assembled to the rod provided on the valve body, the respective members are automatically positioned by the rod, so that the respective members are automatically aligned with respect to the valve body. The Therefore, there is no need to bother the valve body during the assembly work of the valve structure, which facilitates the assembly work.

  According to the invention of claim 2 and claim 4, since the displacement of the coil spring in the horizontal direction is prevented, a uniform initial load can be applied to the entire annular leaf valve, so that the generated damping force is stable. To do.

  According to the invention of claim 3, it is excellent in that a stable damping force can be generated without greatly changing the manufacturing process of the valve disc, and the valve structure can be manufactured at a low cost.

  The valve structure according to the embodiment of the present invention includes a first embodiment shown in FIG. 1 and a second embodiment shown in FIG. The valve structure in the first embodiment shown in FIG. 1 has a valve disc 10 having a first seat surface 16, an annular leaf valve 30, and a bottomed cylindrical shape that houses the valve disc 10 and the annular leaf valve 30. The valve case 20, the valve body 4 having the second seat surface 8, and a coil spring 18 that urges the valve disc 10 and the annular leaf valve 30 toward the valve body 4. The structure is embodied in the base valve portion of the shock absorber. Although the valve structure in the first embodiment is embodied in the base valve portion of the shock absorber as shown in the drawing, it is needless to say that the valve structure may be embodied in another portion of the shock absorber.

  On the other hand, a shock absorber in which this valve structure is embodied is not shown, but a cylinder 1, an outer cylinder 2 that covers the cylinder 1, and a head member (not shown) that seals the upper ends of the cylinder 1 and the outer cylinder 2. ), A piston rod (not shown) that slidably passes through a head member (not shown), a piston (not shown) provided at an end of the piston rod (not shown), a cylinder 1 and The cylinder 1 includes a sealing member C that seals the lower end of the outer cylinder 2. The cylinder 1 is partitioned into a rod side chamber (not shown) and a piston side chamber R1 by a piston (not shown). A compensation chamber R is formed by a gap between the outer cylinder 2 and liquid such as hydraulic oil is sealed in the rod side chamber (not shown) and the piston side chamber R1, and at the same time, gas is contained in the compensation chamber R. And liquid is enclosed. Also, although not shown, a piston (not shown) is provided with a flow path that connects the rod side chamber (not shown) and the piston side chamber R1, and a damping force such as a leaf valve or an orifice is provided in this flow path. A generating element is provided. Although the shock absorber is configured as a so-called double cylinder as described above, each part is well-known and will not be described in detail. In addition, you may comprise a buffer as a single cylinder type, and it is good also as a type isolate | separated from the buffer body with the compensation chamber as a tank.

  Hereinafter, the valve disc 10 will be described in detail. The valve disc body 12 includes a disc-shaped valve disc main body 12, a columnar protrusion 11 provided on the upper surface of the valve disc main body 12, and a first provided on the lower surface of the valve disc main body 12. The seat surface 16, the columnar portion 13 depending from the inner peripheral end of the first seat surface 16, the notch 14 provided on the outer periphery of the columnar portion 13, and the axial center portions of the valve disc main body 12 and the columnar portion 13. It is composed of a through-hole 19 and is slidably inserted into the inner periphery of the annular leaf valve 30 on which the cylindrical portion 13 is stacked. The first seat surface 16 is formed in an annular shape by providing a stepped portion on the lower surface of the valve disk body 12, and the upper surface in FIG. Touched. The valve disc body 12 is provided with a passage 17 through which the liquid in the shock absorber passes. It is sufficient that at least one passage 17 is provided, and a plurality of passages 17 may be provided.

  The annular leaf valve 30 is configured by laminating two leaf valves as shown in the drawing, and the inner peripheral diameter is set slightly larger than the outer peripheral diameter of the cylindrical portion 13 of the valve disc 10, that is, A slight sliding gap is secured between the inner periphery of the annular leaf valve 30 and the outer periphery of the cylindrical portion 13. Further, the cylindrical portion 13 is slidably inserted into the inner periphery. The annular leaf valve 30 is bent from the first peripheral surface 16 to the inner peripheral side of the annular leaf valve 30 by bending the inner peripheral side. Since the upper surface in FIG. 1 is separated, the inner peripheral diameter is reduced by a small amount because the inner peripheral side is bent, so that the bending is not hindered while sliding on the outer periphery of the cylindrical portion 13. Is set to a suitable diameter. Further, if the inner peripheral diameter of the annular leaf valve 30 is made excessively larger than the outer peripheral diameter of the cylindrical portion 13, it is not possible to prevent the positional deviation of the annular leaf valve 30. Therefore, it is preferable that the inner peripheral side bend is not hindered. Small diameter is recommended. In the illustrated example, the annular leaf valve 30 is formed by stacking two leaf valves. However, the annular leaf valve 30 may be formed by a single leaf valve or by stacking three or more sheets.

  Further, the valve body 4 is formed on the valve body main body 5 formed in a disk shape, the annular second seat surface 8 formed on the upper surface of the valve body main body 5, and also on the upper end of the valve body main body 5. An annular fitting portion 9 into which a valve case 20 having a diameter larger than that of the second seat surface 8 is fitted, and a cylindrical rod 31 rising from an axial center portion on the upper surface of the valve body 5 are configured. The valve body 5 is provided with a passage 6 through which the liquid in the shock absorber passes. It is sufficient that at least one passage 6 is provided, and a plurality of passages 6 may be provided. In addition, a plurality of notches 7 are provided at the lower end of the valve body 4 so that the inside and the outside of the valve body 4 communicate with each other. Then, the rod 31 of the valve body 4 is slidably inserted into the hole 19 of the valve disc 10, so that the valve disc 10 is displaced in the horizontal lateral direction in FIG. It is prevented.

  The valve case 20 is formed in a bottomed cylindrical shape, a hole 21 is provided at the center of the bottom (upper end in FIG. 1), a through hole 22 indicated by a broken line in FIG. A plurality of slits 23 are formed in the cylindrical portion. The valve case 20 accommodates the above-described valve disk 10 and the annular leaf valve 30 inside thereof, and the opening end side (the lower end in FIG. 1) is in the annular fitting portion 9 of the valve body 4. At this time, the protrusion 11 of the valve disc 10 is slidably inserted into the hole 21 of the valve case 20, and the bottom of the valve case 20 and the upper surface of the valve disc main body 12 of the valve disc 10. A coil spring 18 is interposed between the two. The lower end of the coil spring 18 in FIG. 1 is fitted on the outer periphery of the protrusion 11 of the valve disk 10 to prevent the coil spring 18 from shifting in the horizontal direction in FIG. . Therefore, the valve disc 10 and the annular leaf valve 30 housed in the valve case 20 are urged toward the valve body 4 by the coil spring 18, and the lower end of the annular leaf valve 30 in FIG. Then, it comes into contact with the second seat surface 8 of the valve body 4 under the biased state. That is, an initial load is applied to the annular leaf valve 30, and the cracking pressure at which the upper surface of the annular leaf valve 30 in FIG. 1 is separated from the first seat surface 16 is adjusted by the magnitude of the initial load. Will be doing. The outer peripheral diameter of the annular leaf valve 30 in the first embodiment is set to be smaller than the inner peripheral diameter of the valve case 20, and the outer peripheral side of the annular leaf valve 30 is separated from the second seat surface 8. When in a bent state, the outer peripheral end bends upward in FIG. 1 with the first seat surface 16 as a fulcrum, but the outer peripheral diameter is set smaller than the inner peripheral diameter of the valve case 20, The annular leaf valve 30 is prevented from interfering with the inner periphery of the valve case 20.

  Furthermore, a bottomed cylindrical cap 3 is provided to cover the valve case 20, and a hole 3b is provided in the bottom (upper end in FIG. 1) of the cap 3, and the lower surface in FIG. 1 is in contact with the upper surface in FIG. 1 and the inner periphery on the open end side is fitted to the outer periphery of the valve body 5 of the valve body 4. Then, the outer periphery of the cap 3 is fitted to the lower end of the inner periphery of the cylinder 1, and the lower surface in FIG. 1 of the valve body 4 is brought into contact with the inner surface of the sealing member C press-fitted into the outer cylinder 2. Is clamped between the cylinder 1 and the sealing member C and fixed in the shock absorber. The cap 3 is provided with a flange 3a at the lower end in FIG. 1, and the flange 3a is sandwiched between the valve body 4 and the lower end in FIG. Although it functions as a stopper that prevents the body 4 from falling off, a flange may be provided on the valve case 20 so as to be sandwiched between the valve body 4 and the lower end of the cylinder 1. However, in this case, the valve case 20 itself is increased in size, and the coil spring 18 interposed in the valve case 20 must be increased in diameter. In some cases, the valve disc 4 must be increased in size at the same time. Therefore, the weight of the shock absorber as a whole increases, and the manufacturing cost also increases due to the increase in size of each member. Therefore, there is an advantage of providing the cap 3 in that respect.

  The operation of the valve structure configured as described above is as follows. During the compression stroke of the shock absorber, the piston side chamber R1 contracts and the rod side chamber (not shown) in which the liquid in the cylinder 1 expands is added to the rod side chamber. The liquid corresponding to the volume of a piston rod (not shown) that enters the cylinder 1 becomes excessive in the cylinder 1 at the same time as it flows through the flow path that connects the piston side chamber R1 (not shown) and the piston side chamber R1. Then, the excess liquid passes through the hole 3a of the cap 3, the through hole 22 of the valve case 20, the inside of the valve case 20 and the passage 17, and applies pressure to the annular leaf valve 30, but at a predetermined cracking pressure. When reaching, the inner peripheral side of the annular leaf valve 30 bends with the second seat surface 8 as a fulcrum. Then, since the notch 14 is provided in the cylindrical portion 13 of the valve disc 10, the liquid passes through the notch 14, and further passes through the passage 6 and the notch 7 of the valve body 4 to enter the compensation chamber R. Inflow. At this time, a damping force can be generated by a pressure loss when the liquid passes through the inner peripheral side of the annular leaf valve 30. When the compression of the shock absorber is stopped, the pressure applied to the annular leaf valve 30 is eliminated, so that the annular leaf valve 30 is restored to the original state, that is, the inner peripheral side deflection is eliminated. However, since there is only a sliding gap between the inner periphery of the annular leaf valve 30 and the outer periphery of the cylindrical portion 13 of the valve disc 10, the annular leaf valve 30 is positioned in the horizontal direction in FIG. There will be no misalignment. The valve disc 10 is not displaced in the horizontal direction in FIG. 1 with respect to the valve body 4 because the rod 31 of the valve body 4 is slidably inserted into the hole 19 of the valve disc 10. . From the above, as a result, the annular leaf valve 30 does not shift in the horizontal direction in FIG. 1 with respect to the valve body 4, and therefore shifts relative to the second seat surface 8 of the valve body 4. Will be prevented.

  Then, the shock absorber always bends with the second seat surface 8 as a fulcrum on the inner peripheral side of the annular leaf valve 30 during the compression stroke, but the annular leaf valve 30 is displaced with respect to the second seat surface 8. Therefore, if the pressure load is the same, the generated damping force is always constant. Therefore, unlike the conventional valve structure, a stable damping force can be generated without causing variations in the generated damping force.

  Further, since the displacement of the coil spring 18 in the horizontal direction is prevented, a uniform initial load can be applied to the entire annular leaf valve 30, so that the generated damping force is stabilized. Since the coil spring is used, there is an advantage that the displacement in the horizontal direction can be prevented. To bias the valve disc 10 and the annular leaf valve 30 toward the valve body 4, an elastic body or Other shaped springs may be used.

  On the contrary, when the shock absorber is in the expansion stroke, the rod side chamber (not shown) contracts, and the flow that communicates the rod side chamber (not shown) and the piston side chamber R1 with the piston side chamber R1 in which the liquid in the cylinder 1 expands. At the same time as it flows in through the path, the liquid corresponding to the volume of a piston rod (not shown) that retreats from the cylinder 1 becomes insufficient in the cylinder 1. Then, the insufficient liquid passes through the notch 7 and the passage 6 of the valve body 4 from the compensation chamber R, and the outer peripheral side of the annular leaf valve 30 is shown in FIG. 1 with the annular leaf valve 30 as the fulcrum of the first seat surface 16. The valve disc 10 is pushed upward in FIG. 1 against the spring force of the coil spring 18 at the same time as being bent in the middle and upward, and the outer peripheral side of the annular leaf valve 30 between the lower surface in FIG. 1 and the second seat surface 8. And flows into the piston side chamber R1. At this time, since the liquid passes through the outer peripheral side of the annular leaf valve 30 and the slit 23 of the valve case 20, almost no pressure loss occurs. When the expansion of the shock absorber stops, the pressure applied to the annular leaf valve 30 is eliminated, so that the annular leaf valve 30 is restored to the original state, that is, the outer peripheral side deflection is eliminated. Since there is only a sliding gap between the inner periphery of the annular leaf valve 30 and the outer periphery of the cylindrical portion 13 of the valve disc 10, the annular leaf valve 30 is positioned in the horizontal direction in FIG. There is no misalignment.

  Then, the shock absorber always bends on the outer peripheral side of the annular leaf valve 30 with the first seat surface 16 as a fulcrum during the extension stroke, but the annular leaf valve 30 may be displaced with respect to the first seat surface 16. Therefore, if the pressure load is the same, the generated damping force is always constant. Therefore, unlike the conventional valve structure, a stable damping force can be generated without causing variations in the generated damping force.

  Furthermore, with a slight design change to the existing valve structure, for example, for the conventional valve structure, a cylindrical part, notch and hole are provided in the valve disc, and the valve body is slidably inserted into the hole. Since a stable damping force can be generated only by providing the rod to be manufactured, there is also an advantage that it can be manufactured without making a major change in the manufacturing process.

  In addition, since the effect can be obtained by replacing only the valve disk and the valve body with respect to the existing shock absorber, the compatibility with the existing shock absorber is also excellent.

  Further, when the respective members constituting the valve structure are assembled to the rod 31 provided in the valve body 4, the respective members are automatically positioned by the rod 31, so that the respective members are automatically set with respect to the valve body 4. Is aligned. Therefore, it is not necessary to align the valve body 4 during the assembly work of the valve structure, which facilitates the assembly work.

  It should be noted that the shape of the hole 19 of the valve disc 10 and the rod 31 of the valve body 4 is not necessarily circular in cross section as long as the horizontal displacement of the valve disc 10 with respect to the valve body 4 can be prevented. Further, the outer shape of the valve disc main body 12 of the valve disc 10 and the valve body main body 5 of the valve body 4 and the cylindrical portion of the valve case 20 do not necessarily have to be cylindrical or cylindrical.

  By the way, as described above, the cylindrical portion 13 of the valve disc 10 is slidably inserted into the inner periphery of the annular leaf valve 30 so that the first seat surface 16 of the valve disc 10 of the annular leaf valve 30 and thus the valve. The displacement of the body 4 with respect to the second seat surface is prevented, but instead, the outer periphery of the annular leaf valve 30 is slidably inserted into the inner periphery of the valve case 20 to prevent the displacement. You may do that. However, in this case, the amount of bending on the outer peripheral side of the annular leaf valve 30 is larger than the amount of bending on the inner peripheral side, so that the sliding between the inner periphery of the valve case 20 and the outer periphery of the annular leaf valve 30 is large. The setting of the dynamic gap becomes severe, but instead, displacement can be prevented on the outer peripheral side of the annular leaf valve 30, so that it is not necessary to provide the cylindrical portion 13 on the valve disc 10, and a stable damping force is generated. It is excellent in that it can be manufactured at low cost without making a major change in the manufacturing process of the valve disc.

 Next, the second embodiment shown in FIG. 2 will be described. Note that the description of the same parts as those in the first embodiment is repeated, and therefore, the detailed description thereof is omitted only by attaching the same reference numerals.

  The valve structure in the second embodiment includes a valve disc 50 having a first seat surface 56, an annular leaf valve 30, and a bottomed cylindrical valve case 20 that houses the valve disc 50 and the annular leaf valve 30. And a valve body 64 having a second seat surface 68, and a coil spring 18 that urges the valve disc 50 and the annular leaf valve 30 toward the valve body 64. The embodiment is embodied in the base valve portion of the shock absorber as in the embodiment. The valve disc 50 and the valve body 64 are members different from those in the first embodiment, and these different members will be described in detail below. Although the valve structure in the second embodiment is embodied in the base valve portion of the shock absorber as illustrated, it is needless to say that the valve structure may be embodied in another portion of the shock absorber.

  The valve disc 50 includes a disc-shaped valve disc main body 52, a columnar protrusion 51 provided on the upper surface of the valve disc main body 52, a first seat surface 56 provided on the lower surface of the valve disc main body 52, A cylindrical portion 53 that hangs down from the inner peripheral end of one seat surface 56, a notch 54 provided on the outer periphery of the cylindrical portion 53, and the protrusion 51, the valve disc body 52, and the axial center portion of the cylindrical portion 53. The cylindrical portion 53 is slidably inserted into the inner periphery of the laminated annular leaf valve 30. The first seat surface 56 is formed in an annular shape by providing a stepped portion on the lower surface of the valve disc body 52, and the upper surface in FIG. Touched. The valve disc main body 52 is provided with a passage 57 through which the liquid in the shock absorber passes. Note that the inner peripheral diameter of the annular leaf valve 30 into which the cylindrical portion 53 is inserted is set slightly larger than the outer peripheral diameter of the cylindrical portion 53 of the valve disc 50 as in the first embodiment. A slight sliding gap is secured between the inner periphery and the outer periphery of the cylindrical portion 53.

  Furthermore, the valve body 64 has a valve body main body 65 formed in a disc shape, and an annular second seat surface 68 is formed on the upper surface of the valve body main body 65, and has a larger diameter than the second seat surface 68. An annular fitting portion 69 into which the valve case 20 is fitted is formed, and a cylindrical rod 71 rising from an axial center portion on the upper surface of the valve body 65 is provided, and the axial length of the rod 71 is provided. Is set longer than the rod 31 of the first embodiment. Further, the valve body main body 65 is provided with a passage 66 through which the liquid in the shock absorber passes. It is sufficient that at least one passage 66 is provided, and a plurality of passages 66 may be provided. Furthermore, a plurality of cutouts 67 are provided at the lower end of the valve body 65 so as to communicate the inside and outside of the valve body 65 in a radial manner. As in the first embodiment, the rod 71 of the valve body 64 is slidably inserted into the hole 59 of the valve disc 50, so that the valve disc 50 is shown in FIG. Misalignment in the middle horizontal direction is prevented.

  As described above, the difference from the first embodiment is that the axial length of the rod 71 of the valve body 64 is set longer than that of the rod 31 of the first embodiment, and the rod 71 moves the valve disc 50 up and down. It is a point that penetrates.

  Therefore, also in the second embodiment, the valve disc 50 is prevented from being displaced in the horizontal direction in FIG. 2 with respect to the valve body 64 as in the first embodiment, and the annular leaf valve 30 is prevented. The horizontal displacement with respect to the valve disc 50 is prevented. As a result, the fulcrum of deflection of the annular leaf valve 30 does not shift during expansion / contraction of the shock absorber, so that the generated damping force is always constant if the pressure load is the same. Therefore, since the same operational effects as those of the first embodiment can be obtained, a stable damping force can be generated without causing variations in the generated damping force unlike the conventional valve structure. .

 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 of the valve structure in 1st Embodiment. It is a longitudinal cross-sectional view of the valve structure in 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylinder 2 Outer cylinder 3 Cap 4,64 Valve body 5,65 Valve body main body 6,17,57,66 Passage 8,68 2nd seat surface 9,69 Fitting part 10,50 Valve disc 11,51 Protrusion part 12, 52 Valve disc main body 13, 53 Cylindrical portion 16, 56 First seat surface 18 Coil spring 19, 59 Hole 20 Valve case 21 Hole 22 Through hole 30 Annular leaf valve 31, 71 Rod

Claims (4)

In a valve structure of a shock absorber that includes a valve disc, an annular leaf valve, and a valve body, and generates a predetermined damping force when contracted, the valve disc is an annular provided on the valve disc body and the lower surface of the valve disc body. The first seat surface, a cylindrical portion depending from the inner peripheral end of the first seat surface, a notch provided on the outer periphery of the cylindrical portion, and a hole penetrating the axial center portion of the valve disk, The valve body includes a valve body main body, an annular second seat surface provided on the upper surface of the valve body main body, and a rod that rises from an axial center portion of the upper surface of the valve body main body. The inner surface of the annular leaf valve is slidably inserted so that the upper surface on the inner peripheral side of the annular leaf valve is seated on the first seat surface, and the rod of the valve body is attached to the valve disc. Valve structure slidably inserted into the hole, characterized in that seated an outer peripheral lower surface of the annular leaf valve to the second sheet surface. A bottomed cylindrical valve case that houses the valve disc and the annular leaf valve is provided inside, and the opening end side of the valve case is fitted on the upper surface side of the valve body and on the outer peripheral side from the second seat surface. At the same time, the valve disc is provided with a projection that stands up from the axial center of the top surface of the valve disc body, and a coil spring that is fitted on the outer periphery of the projection is interposed between the bottom of the valve case and the valve body. 2. The valve structure according to claim 1, wherein the valve disc and the annular leaf valve are urged toward the valve body by the coil spring. In a valve structure of a shock absorber that includes a valve disc, an annular leaf valve, and a valve body, and generates a predetermined damping force when contracted, the valve disc is an annular provided on the valve disc body and the lower surface of the valve disc body. The valve body includes a valve body main body, and an annular second seat surface provided on the upper surface of the valve body main body. It is composed of a rod that stands up from the axial center of the valve body main body upper surface, and is provided with a bottomed cylindrical valve case that houses the valve disk and annular leaf valve inside, and the open end side of the valve case is the upper surface of the valve body Is fitted to the outer periphery of the second seat surface, and the outer periphery of the annular leaf valve is slidably inserted into the inner periphery of the valve case. Is inserted slidably into the hole of the valve disc so that the inner peripheral upper surface of the annular leaf valve is seated on the first seat surface, and the outer peripheral lower surface of the annular leaf valve is seated on the second seat surface. A valve structure characterized by that. The valve disk is provided with a protrusion that stands up from the axial center of the upper surface of the valve disk body, and one end of the coil spring fitted on the outer periphery of the protrusion is interposed between the bottom of the valve case and the valve body. 4. The valve structure according to claim 3, wherein the valve disc and the annular leaf valve are urged toward the valve body by a coil spring.

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