JP4868876B2 - Damping force generation valve structure of hydraulic shock absorber - Google Patents

Description

  The present invention relates to a hydraulic shock absorber used in a suspension device of a vehicle such as an automobile, and more particularly to a damping force generation valve structure using a leaf valve provided in a piston portion thereof.

  A hydraulic shock absorber used in a suspension device of a vehicle such as an automobile has a piston portion or a base valve for appropriately reducing vibration transmitted from the road surface to the vehicle body during traveling and improving riding comfort and operability. A valve structure for generating a damping force is provided in the part.

  As this specific structure, various things can be exemplified, but as a general structure provided in the piston portion, for example, a damping force generation valve structure of a hydraulic shock absorber shown in Patent Document 1 is exemplified. Can do.

  That is, as shown in FIG. 8, a compression side damping force generating valve 5 comprising compression side valve stopper 3, spacer 4 and a plurality of leaf valves 5, compression side and extension side ports 6a, 6b on the reduced diameter mounting portion 2 of the piston rod 1. The extension side damping force generating valve 7 consisting of a plurality of leaf valves, a spacer 8 and a spacer 8 and an extension valve stopper 9 are sequentially stacked through a mounting hole formed in the center thereof, and the spacer A nut 10 is screwed from above 8, and is fixed in a state in which a compressive load is applied between the above-described members and the base end portion 2a of the reduced diameter mounting portion 2.

  Therefore, when the hydraulic shock absorber is operated, the hydraulic oil that has passed through the expansion side or compression side ports 6b and 6a by the expansion and contraction of the piston rod 1 deflects the expansion side or compression side damping force generation valves 7 and 5, respectively. Generates a damping force.

  At this time, among the plurality of leaf valves constituting the compression side damping force generating valve 5, a plurality of notch portions 15 are provided on the outer periphery of the leaf valve 5a closest to the pressure side port 6a. By passing the hydraulic oil, the damping force of the orifice characteristic in the low speed region of the piston speed is generated.

And since this notch part 15 can be formed with high precision without post-processing at the time of leaf valve molding, predetermined predetermined damping force can be generated cheaply and reliably.
Japanese Patent Laid-Open No. 11-294515 (FIG. 1)

  The damping force generating valve structure configured as described above is not particularly problematic, but there may be a case where the following problems occur.

  That is, in the leaf valve 5a with the notch 15 configured as described above, as shown in FIG. 9, the pressure side valve seat portion 16 that defines the pressurizing flow path of the pressure side port 6b has an annular groove portion 17, It is difficult to use the piston 19 having chrysanthemum (or cross-shaped) opening windows 18 that are alternately arranged on the circumference with respect to the expansion side port 6b.

  That is, since the leaf valve 5a is formed in an annular shape and has no so-called directionality, the notch portion 15 is accurately positioned and placed with respect to the opening window portion 18 that does not face the expansion side port 6b. In the case of automation, an expensive device is required and the assembly cost increases.

  Further, even when the step of positioning and mounting the leaf valve 5a on the pressure side valve seat portion 16 is employed manually, it is still necessary to be careful, so that the work time is increased and the assembly cost is increased accordingly. .

  For this reason, instead of the leaf valve 5a with the notch 15, the normal annular leaf valve without the notch 15 is used, and the orifice characteristic described above is formed by forming the stamped orifice in the opening window 18. May occur.

  In this case, it is common to provide a stamping orifice integrally when forming the piston. However, when the piston is formed by sintering, in order to obtain processing accuracy like a notch formed in the leaf valve, However, there is a problem that finishing work by post-processing is required, the number of processing steps is increased, and the assembly cost is increased.

  Accordingly, an object of the present invention is to provide a high precision and low cost even for a piston having an opening window portion in which the compression side valve seat portions are alternately arranged on the circumference with respect to the expansion side port. To provide a damping force generating valve structure of a hydraulic shock absorber having a structure capable of using a leaf valve with a notch.

To achieve the above object, the first means constitute a piston portion that slides in the cylinder, a piston and a extension side port and the compression side port, formed on the end face of the piston above extension phase or a valve seat portion defining a pressurization passage of one port of said pressure side port, away seatable along with being placed on the valve seat portion, an annular leaf valve having a notch portion on the outer periphery with the door, the valve seat portion is the extension side or the damping force generating valve of the hydraulic shock absorber comprising a opening window portion disposed alternately on the circumference relative to the other port of said compression side port in the structure, and the leaf valve, when mounted the leaf valve to the valve seat portion between the piston, positioning means for positioning so that the cutout portion is disposed on the opening window portion Provided, the positioning means is characterized by being composed of the leaf valve from the pawl portion formed by bending form to the valve seat portion, and the other port to insert the claw portion .
The second means constitutes a piston portion that slides in the cylinder, and includes a piston having an expansion side port and a compression side port, and is formed on an end surface of the piston and is formed on the expansion side or the pressure side port. A valve seat portion defining a pressurizing flow path of one of the ports, and an annular leaf valve that is detachably mounted on the valve seat portion and has a notch portion on the outer periphery. In the damping force generating valve structure of the hydraulic shock absorber, wherein the leaf portion has an opening window portion alternately arranged on the circumference with respect to the other port of the extension side or the pressure side port, the leaf valve Positioning means for positioning the notch portion on the opening window portion when the leaf valve is placed on the valve seat portion between the piston and the piston. The step is composed of a claw portion formed by bending the leaf valve toward the valve seat portion, and a step portion formed on the inner peripheral surface of the piston rod mounting hole of the piston so that the claw portion is inserted. It is characterized by that.

  According to the present invention, when the leaf valve with a notch is placed on the valve seat formed on the piston end surface, the notch of the leaf valve is positioned by the positioning means provided between the leaf valve and the piston. The part can be reliably positioned and arranged on the opening window part of the valve seat part.

Therefore, it is possible to easily place the cutout portion on the opening window portion of the piston without performing assembling work using an expensive apparatus as shown in the conventional example or careful manual work. This also eliminates the need for another process such as forming a notched orifice in the opening window, so that a highly accurate leaf valve with a notched portion can be used at a low assembly cost.
According to the first aspect of the present invention, in addition to the above-described effect, the leaf valve and the piston are positioned by inserting a claw provided on the leaf valve into the other port. It is possible to carry out with a simple operation of providing the claw portion only on the top.
Further, since the claw portion is formed integrally with the leaf valve by bending a part of the leaf valve to the opening window side, it can be implemented at a low cost without increasing the number of parts and processing steps.

  Hereinafter, an embodiment in which the present invention is embodied in a damping force generation valve structure provided in a piston portion of a hydraulic shock absorber used in an automobile suspension device will be described with reference to the drawings.

  As shown in FIG. 1, the damping force generating valve structure includes a compression side valve stopper 3, a spacer 4, a compression side damping force generation valve 5, and compression side and extension side ports 6 a and 6 b on the reduced diameter mounting portion 2 of the piston rod 1. The piston 6 provided, the initial load generating member 4a, the extension side damping force generating valve 7, the spacer 8 and the guide member 11 into which the upper spring receiver 9 is inserted into the outer peripheral surface are provided with mounting holes formed in the center thereof. And the coil spring 10a and the nut 10 are screwed into the reduced diameter mounting portion 2 from below the guide member 11, and the guide member 11 is pressed by the tip of the nut 10, thereby the piston 6 described above. The compression side damping force generating valve 5, the spacer 4 and the compression side valve stopper 3 are fixed in a state where a compressive load is applied between the compression side mounting portion 2 and the proximal end portion 2a.

  Further, the coil spring 10a disposed between the upper spring receiver 9 and the lower spring receiver 9a provided on the outer periphery of the nut 10 is compressed, so that the initial load generating portion 4a and the extension side damping are reduced. The force generating valve 7 and the spacer 8 are fixed in a state where a compressive load is applied to the piston 6.

  More specifically, the piston 6 is formed with a mounting hole 6c for inserting the reduced diameter mounting portion 2 at the center thereof, the pressure side port 6a is formed on the outer peripheral side thereof, and the inner peripheral side thereof. Is formed with the extension side port 6b.

   As shown in FIG. 2, a pressure passage is defined by a valve seat portion at the opening portion of the pressure side port 6a on the back surface of the piston 6, and in this embodiment, an independent opening window portion 21 as the valve seat portion. Are arranged in a cross shape, and the extended side ports 6b are arranged between the adjacent open window portions 21, and the open window portions 21 and the extended side ports 6b are alternately arranged.

  The compression side damping force generation valve 5 is configured by stacking a plurality of leaf valves 5a having different diameters, and closes the compression side port 6a so as to be openable and closable while being fixed on the inner peripheral side.

  Further, among the plurality of leaf valves 5a, the window-side leaf valve 5b that is seated on and away from the opening window portion 21 generates a damping force in the low speed region of the piston speed, as shown in FIG. Four cutout portions 15 are formed.

  Four openings 22 are formed on the inner side of the window-side leaf valve 5b between the adjacent notches 15 and the leaf valve 5b is formed on the inner edge of the opening 22 as an opening window. Four claw portions 23 formed by bending toward the 21 side are provided.

  These claw portions 23 are arranged so that each claw portion 23 can be inserted into each extension side port 6b, and, as shown in FIG. It is easy to do.

  The claw portion 23 and the extension side port 6b constitute the positioning means of the present invention, and the window side leaf valve 5b is mounted on the opening window portion 21 so that the claw portion 23 is inserted into the extension side port 6b. When placed, the notch 15 is positioned in a state of being arranged on the opening window 21.

  An outer seat surface 12 is formed between the pressure side port 6a and the expansion side port 6b on the inner surface of the piston 6, and an annular shape for fitting and fixing the guide member 11 on the inner peripheral side of the expansion side port 6b. A recess 13 is formed.

  The guide member 11 whose base end is fitted and fixed to the annular recess 13 is formed from a cylindrical body portion 11a and a large-diameter disk-shaped inner sheet surface 14 provided at the base end. .

  The extension side damping force generation valve 7 is configured by laminating a plurality of leaf valves 7a having a disk shape with the same diameter, and is formed with a mounting hole diameter substantially the same as the outer diameter of the guide member 11. The leaf valve 7a is inserted into the guide member 11 through the mounting hole so as to be movable up and down, and the inner diameter portion of the leaf valve 7a is placed on the inner seat surface 14 through the initial load generating member 4a.

  The initial load generating member 4a is formed by laminating three plate members 4b having the same diameter and forming a disk shape, and the height of the initial load generating portion 4a is set lower than the height of the outer peripheral sheet surface 12. Thus, the extension side damping force generation valve 7 laminated on the lower surface is bent upward, and an initial load can be generated on the extension side damping force generation valve 7.

  The spacer 8 is formed in a disk shape having a smaller diameter than the extension side damping force generating valve 7 and is guided through an attachment hole formed in an attachment hole diameter substantially the same as the outer diameter of the guide member 11. It is inserted into the member 11 so as to be movable up and down, and is laminated so as to be movable up and down with respect to the leaf valve 7a.

  The upper spring receiver 9 is formed in a disk shape having substantially the same diameter as the extension side damping force generating valve 7 and through an attachment hole formed in an attachment hole diameter substantially the same as the outer diameter of the guide member 11. The lever is inserted into the guide member 11 and laminated on the spacer 8.

  Therefore, the initial load generating member 4a, the leaf valve 7a, the spacer 8 and the upper spring receiver 9 inserted into the guide member 11 are restricted from moving in the radial direction on the outer peripheral surface of the guide member 11, and Since the movement in the vertical direction is restricted by the inner sheet surface 14, that is, in this embodiment, the downward movement is prevented, so-called sub-assembly is achieved.

  The nut 10 is screwed toward the piston 6 side with respect to the threaded portion 2b provided on the reduced diameter mounting portion 2, and the tip portion thereof is brought into pressure contact with the guide member 11, whereby the piston 6 and the pressure side damping force generating valve 5 are pressed. The spacer 4 and the pressure side valve stopper 3 are fixed by applying a compressive load between the base end portion 2a of the reduced diameter mounting portion 2.

  At this time, the coil spring 10a disposed between the upper spring receiver 9 and the lower spring receiver 9a is in a compressed state, so that the initial load generating member 4a, the extension side damping force generating valve are set. 7 and the spacer 8 are fixed in a state where a compressive load is applied to the piston 6.

  In addition, the front-end | tip part 2c of the reduced diameter attachment part 2 positions and fixes the nut 10 by tightening so that it may expand to an outer peripheral side, after the nut 10 is screwed together.

  In the damping force generation valve structure of the hydraulic shock absorber configured as described above, when the compression side damping force generation valve 5 is configured by mounting a plurality of leaf valves 5 a on the opening window 21 on the inner surface of the piston 6. When the claw portion 23 of the window portion side leaf valve 5b is inserted into the extension side port 6b, the relative movement between the window portion side leaf valve 5b and the piston 6 is restricted by the insertion of the claw portion 23 into the extension side port 6b. At the same time, the notch 15 of the window side leaf valve 5b is positioned and fixed so as to be disposed on the opening window 21.

  Therefore, the window so that the notch 15 is positioned on the opening window 21 on the inner surface of the piston 6 can be easily installed without using an expensive apparatus as shown in the conventional example or careful manual work. The part-side leaf valve 5b can be placed, and another process such as forming a notch-cutting orifice in the opening window part 21 is not required. Therefore, the window-side leaf valve 5b with the high-precision notch part 15 is provided. It can be used at an inexpensive assembly cost.

  Further, since the claw portion 23 provided on the window side leaf valve 5b is inserted into the expansion side port 6b to provide positioning means between the leaf valve 5b and the piston 6, only the claw portion 23 is provided on the leaf valve 5b side. It becomes possible to carry out with a simple operation.

  In addition, since the claw portion 23 is formed integrally with the leaf valve 5b by bending a part of the leaf valve 5b toward the opening window portion 21, the cost can be reduced without increasing the number of parts and processing steps. be able to.

  Further, since the tip of the claw portion 23 has a triangular shape, it is easy to insert the claw portion 23 into the expansion side port 6b.

  In addition, this invention is not limited to the said embodiment, For example, it can also be changed and embodied as follows.

  1) In the present embodiment, the positioning means of the present invention is configured by inserting the claw portion 23 into the expansion side port 6b. However, the present invention is not limited to this, and a recess is provided on the inner surface of the piston 6. When the claw portion 23 is fitted in the recess, the notch portion 15 may be disposed on the opening window portion 21.

  Further, as shown in FIGS. 5, 6, and 7, a claw portion 24 formed by bending the inner peripheral side edge of the window portion side leaf valve 5b to the opening window portion 21 side, and the claw portion 24 are inserted. As described above, the positioning means of the present invention may be constituted by the step portion 25 formed on the inner peripheral surface of the piston rod mounting hole 6c of the piston 6.

  2) In the present embodiment, the claw portion 23 is provided integrally with the window-side leaf valve 5b. However, the present invention is not limited to this, and the claw portion 23 formed of a separate member is used as the window-side leaf valve. You may join to 5b by methods, such as adhesion | attachment and welding.

  3) In the present embodiment, the independent opening window 21 as the valve seat portion is shown in a cross shape. However, the present invention is not limited to this, and the annular groove portion as shown in the conventional example is used. And a valve seat portion provided with chrysanthemum (or cross-shaped) opening windows that are alternately arranged on substantially the same circumference with respect to the extended port.

  4) In the present embodiment, the valve seat portion formed on the back surface of the piston 6 is embodied. However, the present invention is not limited to this, and the valve seat portion formed on the inner surface of the piston 6 may be embodied. good.

It is sectional drawing of the damping force generation | occurrence | production valve | bulb structure which shows the best form of this invention. It is a rear view of the piston in FIG. It is a top view of the leaf valve with a notch part in FIG. It is the sectional view on the AA line in FIG. It is a top view of the leaf valve with a notch which shows another example of this invention. It is the BB sectional view taken on the line in FIG. FIG. 6 is a cross-sectional view of a damping force generating valve structure showing a state where the leaf valve with a notch portion of FIG. 5 is placed. It is sectional drawing of the damping force generation valve structure which shows the prior art example of this invention. It is a rear view of the piston which shows another prior art example of this invention.

Explanation of symbols

5b Leaf valve 6 Piston 6a Pressure side port 6b Extension side port (Positioning means)
6c Mounting hole inner peripheral surface 15 Notch 21 Opening window (valve seat)
23 Claw (positioning means)
24 Claw part (positioning means)
25 Stepped part

Claims (2)

Constitutes a piston portion that slides in the cylinder, a piston and a extension side port and the compression side port, pressurizing flow one port of the formed on the end face of the piston the extension phase or the compression side port a valve seat portion defining a road, while being placed so as to be away seated on the valve seat portion, and an annular leaf valve having a notch portion on the outer periphery, the valve seat portion is the extension side or the in the damping force generating valve structure of a hydraulic shock absorber comprising a opening window portion disposed alternately on the circumference relative to the other ports of the compression side port, and the leaf valve, between the piston when placing the this leaf valve in the valve seat portion is provided with positioning means for positioning so that the cutout portion is disposed on the opening window portion, the positioning means, the Rifuba A pawl portion formed by bending form blanking to the valve seat portion, the damping force generating valve structure of a hydraulic shock absorber which is characterized by being composed of the above-described other port to insert the claw portion. A piston portion that slides in the cylinder, and includes a piston having an extension side port and a pressure side port, and a flow for pressurization of one of the extension side and the pressure side port formed on the end surface of the piston. A valve seat portion that defines a path, and an annular leaf valve that is detachably mounted on the valve seat portion and has a notch on the outer periphery, the valve seat portion being the extension side or the In the damping force generating valve structure of the hydraulic shock absorber having the opening windows alternately arranged on the circumference with respect to the other one of the compression side ports, the leaf valve and the piston are interposed between the leaf valve and the piston. When the leaf valve is placed on the valve seat portion, positioning means is provided for positioning so that the notch is disposed on the opening window portion. It is composed of a claw part formed by bending the valve to the valve seat part side, and a step part formed on the inner peripheral surface of the piston rod mounting hole of the piston so that the claw part is inserted. damping force generating valve structure of a hydraulic shock absorber to.

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