JP2007120583A - Hydraulic shock absorber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an inner diameter of a suspension spring not interfere with an outer periphery of a damper cylinder while simplifying both a spring receiver and a suspension spring.
SOLUTION: In a hydraulic shock absorber 10 in which one end of a suspension spring 20 is supported by a spring receiver 21 locked to the outer periphery of a damper cylinder 11, the spring receiver 21 axially locked to the outer periphery of the damper cylinder 11 is a plate-like body. A plurality of circumferential portions on the inner circumference of the spring receiver 21 are directly used as guide portions 21A that fit into the outer circumference of the damper cylinder 11, and other circumferential circumferential locations on the inner circumference of the spring receiver 21 are cut. What raises 21B and supports the inner periphery of suspension spring 20 on the outer surface of cut and raised part 21B.
[Selection] Figure 2

Description

  The present invention relates to a hydraulic shock absorber.

  As described in Patent Documents 1 and 2, as a hydraulic shock absorber, a piston rod is inserted into a damper cylinder, and one end of the suspension spring is supported by a spring receiver locked on the outer periphery of the damper cylinder, and the other end of the suspension spring is supported. Some are supported by a spring receiver provided on the piston rod.

  The hydraulic shock absorber of Patent Document 1 is provided with a support ring on the outer periphery of the damper cylinder, and when the end of the suspension spring is supported by the support ring, the end of the suspension spring is reduced in the form of a throttle, and the intermediate portion of the suspension spring The inner diameter of the suspension spring is made larger than the inner diameter of the end portion so that the inner diameter of the intermediate portion of the suspension spring does not interfere with the outer periphery of the damper cylinder.

The hydraulic shock absorber of Patent Document 2 is provided with a spring seat on the outer periphery of the damper cylinder, and when the end of the suspension spring is supported by the spring seat, the inner periphery of the spring seat is a guide portion that is burring into a cylindrical shape. The portion can be fitted to the outer periphery of the damper cylinder, and a plurality of locations in the circumferential direction of the spring seat are cut and raised, and the inner circumference of the suspension spring is supported by the outer surface of the cut and raised portion. Thus, the inner diameter of the suspension spring can be set so as not to interfere with the outer periphery of the damper cylinder.
Reality 2-45548 Shoko 63-67054

  In the hydraulic shock absorber of Patent Document 1, it is necessary to squeeze the end of the suspension spring so that the inner diameter of the intermediate portion of the suspension spring does not interfere with the outer periphery of the damper cylinder.

  In the hydraulic shock absorber of Patent Document 2, when the inner diameter of the suspension spring is prevented from interfering with the outer periphery of the damper cylinder, the inner periphery of the spring seat is used as a cylindrical burring guide portion, and this guide portion is the outer periphery of the damper cylinder. The spring seat processing is complicated.

  SUMMARY OF THE INVENTION An object of the present invention is to simplify the spring receiver and the suspension spring while preventing the inner diameter of the suspension spring from interfering with the outer periphery of the damper cylinder.

  According to the first aspect of the present invention, a piston rod is inserted into the damper cylinder, and one end of the suspension spring is supported by a spring receiver locked on the outer periphery of the damper cylinder, and the other end of the suspension spring is supported by a spring receiver provided on the piston rod. In the hydraulic shock absorber, the spring receiver that is axially locked to the outer periphery of the damper cylinder is formed of a plate-like body, and a plurality of guides for directly fitting a plurality of circumferential positions on the inner periphery of the spring receiver to the outer periphery of the damper cylinder And a plurality of other circumferential directions on the inner periphery of the spring receiver are cut and raised, and the inner periphery of the suspension spring is supported by the outer surface of the cut and raised part.

(Claim 1)
(a) The spring receiver is simply machined by pressing a flat plate, etc., and the guide part on the inner periphery of the spring receiver is directly connected to the damper cylinder with the spring receiver axially locked to the outer periphery of the damper cylinder. The outer periphery of the suspension spring is supported by the outer surface of the spring receiving portion that is fitted to the outer periphery and further cut and raised on the inner periphery of the spring receiver. Therefore, the spring receiver needs only to have a simple shape that cuts the inner periphery of the flat plate, and can be easily processed.

  (b) Since the guide part that fits directly to the outer periphery of the damper cylinder is provided on the inner periphery of the spring receiver, and the inner periphery of the suspension spring is supported by the outer surface of the cut and raised part of the inner periphery of the spring receiver, Between the inner periphery of the suspension spring and the outer periphery of the damper cylinder, a clearance is formed for a distance that the outer surface of the cut and raised portion is separated from the inner peripheral diameter of the guide portion in the radial direction. Therefore, it is possible to prevent the inner diameter of the suspension spring from interfering with the outer periphery of the damper cylinder without reducing the end of the suspension spring, and the degree of freedom in designing the suspension spring is increased.

  1 is an overall view showing a hydraulic shock absorber, FIG. 2 is an enlarged view of a main part of FIG. 1, FIG. 3 is a view showing a spring receiver, (A) is a plan view, and (B) is a BB line in (A). It is sectional drawing which follows.

  The vehicle hydraulic shock absorber 10 shown in FIG. 1 has a rod guide 12 that is caulked and fixed to an opening of a damper cylinder 11, and a shaft sealing means 13 such as an oil seal is caulked and fixed to the outside of the rod guide 12 of the opening. The hydraulic shock absorber 10 inserts the piston rod 14 into the damper cylinder 11 through the rod guide 12 and the shaft sealing means 13 and fixes the piston 15 fixed to the insertion end of the piston rod 14 to the damper cylinder 11 to the damper. The cylinder 11 is slidable.

  The hydraulic shock absorber 10 is used as an inverted type in which the damper cylinder 11 is arranged vertically upward. Inside the damper cylinder 11, a rod side chamber 16A that accommodates the piston rod 14 and a piston side chamber 16B that does not accommodate the piston rod 14 are provided. The rod side chamber 16A and the piston side chamber 16B are filled with hydraulic oil, and a partial upper space of the piston side chamber 16B is used as the air chamber 16C. The vehicle body side mounting member 17 is fixed to the top portion 11A of the damper cylinder 11, and the wheel side mounting portion 18 is provided at the projecting end of the piston rod 14 from the damper cylinder 11.

  The hydraulic shock absorber 10 engages a spring receiver 21 in the axial direction of the damper cylinder 11 with a bulging portion 19 (or a support collar welded to the outer periphery of the damper cylinder 11) bulged on the outer periphery of the damper cylinder 11. . The hydraulic shock absorber 10 holds the support bracket 23 on the fixing portion of the wheel side mounting portion 18 with respect to the protruding end of the piston rod 14 from the damper cylinder 11, and locks the spring receiver 22 to the support bracket 23. The spring receiver 22 includes a fitting portion 22A that fits on the outer periphery of the tip of the support bracket 23, and a flange portion 22B that protrudes to the outer periphery of the fitting portion 22A. The hydraulic shock absorber 10 has a suspension spring 20 interposed between the spring receiver 21 and the spring receiver 22 (flange portion 22B), and cushions the impact force that the vehicle receives from the road surface by the spring reaction force of the suspension spring 20.

  The hydraulic shock absorber 10 is provided with a bump rubber 24 that regulates the maximum compression stroke around the piston rod 14 outside the damper cylinder 11. Further, a rebound rubber 25 for restricting the maximum extension stroke is provided around the piston rod 14 in the damper cylinder 11.

  The hydraulic shock absorber 10 fixes the piston 15 to the piston rod 14 as follows. That is, the piston rod 14 is formed with a small diameter portion 14A at the insertion end into the damper cylinder 11, and the valve stopper 26 and the piston 15 are sequentially inserted into the small diameter portion 14A, and these are once inserted at the end caulking portion 14B of the small diameter portion 14A. Immobilize to.

  The piston 15 is provided with a plurality of oil passages 15 </ b> A communicating with the rod side chamber 16 </ b> A and the piston side chamber 16 </ b> B at a plurality of positions in the circumferential direction, and the oil passages 15 </ b> A are opened at both end faces of the piston 15. The piston 15 has an end surface facing the rod side chamber 16A as a valve seat surface, and opens an oil passage 15A inside the valve seat surface. The inner peripheral portion of the plate valve 27 is sandwiched between the piston 15 and the valve stopper 26, and the outer peripheral side of the plate valve 27 contacts and separates from the valve seat surface to open and close the oil passage 15A. At this time, the piston 15 is provided with an annular groove 15B connected to the openings of the plurality of oil passages 15A so as to extend over the entire circumference of the valve seat surface to which the plate valve 27 contacts and separates, and the plate valve 27 is seated on the valve seat surface. In this state, an oil hole 27A (not shown) that communicates the rod side chamber 16A with the annular groove 15B is provided in the plate valve 27.

The hydraulic shock absorber 10 operates as follows.
(Compression process)
The damper cylinder 11 and the piston rod 14 contract, and the suspension spring 20 is compressed. Further, the piston rod 14 enters the damper cylinder 11, and the compressed oil in the piston side chamber 16B passes through the oil passage 15A of the piston 15, pushes and opens the plate valve 27, and flows into the rod side chamber 16A. The compression side damping force is obtained by the throttle resistance of the opening gap of the plate valve 27 during this period. The spring force of the suspension spring 20 buffers the impact, and the compression side damping force controls the compression speed of the suspension spring 20.

  The air in the air chamber 16C corresponding to the volume of the piston rod 14 entering the damper cylinder 11 is compressed.

  At the time of the most compression, the bump rubber 24 abuts against the end surface of the damper cylinder 11 to regulate the most compression stroke.

(Extension process)
The damper cylinder 11 and the piston rod 14 extend, and the suspension spring 20 extends. In addition, the piston rod 14 retreats from the damper cylinder 11 and the compressed oil in the rod side chamber 16A closes the plate valve 27, passes through the oil hole 27A of the plate valve 27, and passes from the oil passage 15A of the piston 15 to the piston side chamber 16B. Flowing into. During this time, the expansion side damping force is obtained by the drawing resistance of the oil hole 27A. The extension side damping force controls the extension speed of the suspension spring 20.

  The air in the air chamber 16 </ b> C expands by the retraction volume of the piston rod 14 from the damper cylinder 11.

  At the time of maximum extension, the rebound rubber 25 abuts against the back surface of the valve stopper 26 of the piston 15 to regulate the maximum extension stroke.

  Hereinafter, the structure of the spring receiver 21 that is axially locked to the outer periphery of the damper cylinder 11 will be described.

  The spring receiver 21 is a plate-like body having a generally perforated disk shape. The spring receiver 21 has an inner peripheral diameter slightly larger than the outer peripheral diameter of the damper cylinder 11, and a plurality of locations in the circumferential direction of the inner periphery (four locations spaced 90 degrees in this embodiment) are directly attached to the damper cylinder 11. Let it be a guide portion 21A fitted to the outer periphery. The spring receiver 21 is an upper end surface in the axial direction and abuts the inner peripheral side along the guide portion 21 </ b> A with the bulging portion 19 of the damper cylinder 11. Thereby, the spring receiver 21 is fixedly attached to the outer periphery of the damper cylinder 11 in the axial direction and the radial direction.

  The spring receiver 21 is cut and raised at several other circumferential locations (between adjacent guide portions 21A in this embodiment) that have the same diameter as the guide portion 21A and is raised in the axial direction. 21B. The spring receiver 21 is the lower end surface in the axial direction, and the outer peripheral side of the cut-and-raised portion 21B is used as a seating surface for the suspension spring 20, and the inner periphery of the suspension spring 20 is positioned in the radial direction on the outer surface of the cut-and-raised portion 21B. To support. The inner periphery of the suspension spring 20 supported by the spring receiver 21 is between the outer periphery of the damper cylinder 11 and the outer surface of the cut-and-raised portion 21B from the inner periphery diameter of the guide portion 21A, in other words, from the outer periphery diameter of the damper cylinder 11. A clearance corresponding to a distance separated in the radial direction is formed.

According to the present embodiment, the following operational effects can be obtained.
(a) The spring receiver 21 is simply processed by pressing a flat plate or the like, and the guide portion 21A on the inner periphery of the spring receiver 21 is held in a state where the spring receiver 21 is locked to the outer periphery of the damper cylinder 11 in the axial direction. The damper cylinder 11 is directly fitted to the outer periphery, and the inner periphery of the suspension spring 20 is supported by the outer surface of the cut-and-raised portion 21B of the inner periphery of the spring receiver 21. Therefore, the spring receiver 21 needs only to have a simple shape that cuts up the inner periphery of the flat plate, and can be easily processed.

  (b) A guide portion 21A that fits directly on the outer periphery of the damper cylinder 11 is provided on the inner periphery of the spring receiver 21, and the inner surface of the suspension spring 20 is supported by the outer surface of the cut-and-raised portion 21B of the inner periphery of the spring receiver 21. Therefore, the clearance between the inner periphery of the suspension spring 20 and the outer periphery of the damper cylinder 11 is a distance corresponding to the distance that the outer surface of the cut-and-raised portion 21B is separated from the inner peripheral diameter of the guide portion 21A in the radial direction. . Therefore, the inner diameter of the suspension spring 20 can be prevented from interfering with the outer periphery of the damper cylinder 11 without reducing the end of the suspension spring 20, and the degree of freedom in designing the suspension spring 20 is increased.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention. It is included in the present invention.

FIG. 1 is an overall view showing a hydraulic shock absorber. FIG. 2 is an enlarged view of a main part of FIG. 3A and 3B show a spring receiver, in which FIG. 3A is a plan view and FIG. 3B is a cross-sectional view taken along line BB in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Hydraulic buffer 11 Damper cylinder 14 Piston rod 20 Suspension spring 21 Spring receiver 22 Spring receiver 21A Guide part 21B Cut and raised part

Claims (1)

Insert the piston rod into the damper cylinder,
While supporting one end of the suspension spring with a spring receiver locked to the outer periphery of the damper cylinder,
In the hydraulic shock absorber that supports the other end of the suspension spring with a spring receiver provided on the piston rod,
The spring receiver that is axially locked to the outer periphery of the damper cylinder is a plate-like body,
A plurality of circumferential locations on the inner periphery of the spring receiver are directly guided to the outer periphery of the damper cylinder,
A hydraulic shock absorber characterized in that a plurality of other circumferential locations on the inner periphery of the spring receiver are cut and raised, and the inner circumference of the suspension spring is supported by the outer surface of the cut and raised portion.

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