JP4886731B2 - Spring seat structure of hydraulic shock absorber - Google Patents

Description

  The present invention relates to a spring seat structure of a hydraulic shock absorber.

  Conventionally, as a spring seat structure of a hydraulic shock absorber, when a seat rubber is loaded on a spring seat and the coil spring is seated on the seat surface of the flat portion of the seat rubber, the coil spring is placed on one end side of the flat portion of the seat rubber. There is one in which a thick projection facing the coil terminal is integrally formed and started up. The coil end of the coil spring seated on the seating surface of the flat portion of the seat rubber is applied to the protrusion, and the coil spring is positioned in the circumferential direction, and further, the coil spring is restrained from moving in the circumferential direction. is there.

  In such a conventional hydraulic shock absorber spring seat structure, the coil spring spring load directly contacts the thick protrusion of the seat rubber and the spring load of the coil spring directly touches the flat portion at the base of the protrusion of the seat rubber. Only the flat portion is stretched and deformed with respect to the thick protrusion portion that is pressed and does not stretch and deform hard (FIG. 5D). For this reason, a shear load is generated at the boundary between the thick protrusion and the flat portion of the sheet rubber, and there is a possibility that a crack (K in FIG. 5D) is generated at this boundary and is damaged.

However, in the spring seat structure of the hydraulic shock absorber described in Patent Document 1, a concave groove is provided in advance in a portion corresponding to the base of the protrusion in the flat portion of the seat rubber. As a result, in the state where the coil end of the coil spring is in contact with the thick protrusion of the seat rubber, the coil spring does not press the flat portion at the base of the protrusion of the seat rubber, and the boundary between the thick protrusion and the flat portion is cracked. It does not occur.
JP 10-213168

  However, in the spring seat structure of the hydraulic shock absorber described in Patent Document 1, since the concave portion is provided in the flat portion of the seat rubber, the flat portion needs to be thicker than a certain thickness. Therefore, in order to reduce the thickness of the flat portion of the seat rubber loaded on the small spring seat as much as possible in order to reduce the size and weight of the spring seat, the spring seat structure described in Patent Document 1 is adopted. Can not.

  An object of the present invention is to prevent damage to a seat rubber due to a spring load of a coil spring in a spring seat structure of a hydraulic shock absorber in which a flat portion of a seat rubber on which a coil spring is seated is thin.

  The invention according to claim 1 is a spring seat structure of a hydraulic shock absorber in which a seat rubber is loaded on a spring seat and a coil spring is seated on the seat surface of the thin flat portion of the seat rubber, on one end side of the flat portion of the seat rubber. The stopper that is opposed to the coil end of the coil spring is connected and raised, and the leading end surface that can be brought into contact with the coil end of the stopper with respect to the rising portion of the stopper with respect to the flat portion of the seat rubber is the seat surface of the flat portion. It is made to protrude to the coil terminal side in the direction along.

  According to a second aspect of the present invention, in the first aspect of the present invention, the stopper is made of a thick protrusion formed integrally with the thin flat portion of the sheet rubber.

(Claim 1)
(a) The coil end of the coil spring is applied to a stopper raised at one end of the thin flat portion of the seat rubber to position the coil spring in the circumferential direction, and further, the coil spring can be prevented from moving in the circumferential direction. .

  (b) With respect to the rising portion of the stopper with respect to the flat portion of the seat rubber, the tip end surface that can be brought into contact with the coil terminal of the stopper is protruded toward the coil terminal side in the direction along the seating surface of the flat portion. Thereby, in a state where the coil terminal of the coil spring hits the stopper of the seat rubber, the coil terminal presses the middle part of the flat part away from the rising part of the stopper of the seat rubber. The spring load of the coil spring extends to the middle part of the flat part away from the rising part of the stopper in the seat rubber via the coil end, and this thin and easily stretched flat part is pushed into the middle part to bend and deform flexibly. The spring load of the coil spring does not generate a shearing load at the boundary between the stopper and the flat portion, but bends and deforms the flat portion, and can sufficiently bear the load even in a thin flat portion. Therefore, in order to reduce the size and weight of the spring seat, in the spring seat structure of the hydraulic shock absorber with a thin flat portion of the seat rubber on which the coil spring is seated, the seat rubber is prevented from being damaged by the spring load of the coil spring. it can.

(Claim 2)
(c) Since the stopper is formed of a thick protrusion integrally formed on the thin flat portion of the sheet rubber, the sheet rubber provided with the stoppers (a) and (b) can be easily manufactured.

  1 is a cross-sectional view of a main part showing a hydraulic shock absorber, FIG. 2 is a side view showing the main parts of the spring seat and seat rubber of FIG. 1 in a cutaway view, FIG. 3 is a plan view showing the seat rubber, and FIG. FIG. 5 is a schematic side view showing various forms of the sheet rubber. FIG. 5 is a side view showing the sheet rubber taken along the line IV-IV.

  As shown in FIG. 1, the hydraulic shock absorber 10 is a strut damper type, and a piston rod 12 is inserted into a cylinder (not shown) built in the outer tube 11 (damper tube), and attached to the outer tube 11 on the wheel side. A bracket 13 is provided to be coupled to the wheel, and a piston rod 12 protruding from the outer tube 11 is provided with a vehicle body side mounting bracket 14 to be attached to the vehicle body. The vehicle body side mounting bracket 14 includes a mount rubber assembly 18 including a collar 15, upper and lower mount bases 16 </ b> A and 16 </ b> B, and a mount rubber 17. The collar 15 of the mount rubber assembly 18 is connected to the upper end side small diameter of the piston rod 12. It is configured by being inserted into the part and fastened with a nut 19.

  The hydraulic shock absorber 10 includes a tie rod mounting arm 20 connected to the outer tube 11 and is connected to the tie rod, and transmits a steering force from a steering device (not shown) from the outer tube 11 to a wheel so that the outer tube 11 can roll.

  The hydraulic shock absorber 10 includes a lower spring seat 21 fixed to the outer periphery of the outer tube 11, an upper spring seat 22 that is installed around the piston rod 12 and is supported on the rear surface of the vehicle body side mounting bracket 14 via a thrust bearing 23. A coil spring 24 is interposed therebetween. Specifically, the coil spring 24 is seated on the seat rubber 40 of the lower spring seat 21 and the seat rubber 26 of the upper spring seat 22. The thrust bearing 23 is configured by disposing a thrust plate and a radial plate between an upper case on the vehicle body side mounting bracket 14 side and a lower case on the upper spring seat 22 side, and at the time of rotation accompanying the rolling of the outer tube 11, The coil spring 24 and the upper spring seat 22 are rotated smoothly following the rotation of the lower spring seat 21 fixed to the outer tube 11.

  The hydraulic shock absorber 10 includes a bump rubber 31 that is inserted so as to be firmly held below the vehicle body side mounting bracket 14 of the piston rod 12. The hydraulic shock absorber 10 abuts the bump rubber 31 with the bump stopper cap 32 on the upper end surface of the outer tube 11 and restricts the maximum compression stroke during the maximum compression. The bump rubber 31 is continuously provided with a dust cover 33 covering the upper end opening of the outer tube 11 on the lower end side.

  In other words, the hydraulic shock absorber 10 expands and contracts so that the impact force that the vehicle receives from the road surface is absorbed by the elastic force of the coil spring 24. The hydraulic shock absorber 10 has its expansion and contraction vibrations due to a damping force generated by a piston valve device provided in the piston, a base valve device provided in the cylinder, and the like when a piston (not shown) moves up and down accompanying the expansion and contraction. Is quickly suppressed.

  However, the hydraulic shock absorber 10 has a spring seat structure in which the seat rubber 40 is loaded on the lower spring seat 21 and the coil spring 24 is seated on the seat rubber 40 as follows.

  As shown in FIGS. 1 and 2, the spring seat 21 has a mounting hole 21 </ b> A that is inserted and welded to the outer tube 11 at the center, and has a hook shape surrounded by the outer peripheral rib 21 </ b> B. The spring seat 21 has a sheet surface 21C on which the seat rubber 40 is loaded in close contact corresponding to the coil end winding portion 24A of the coil spring 24, and extends in a gently inclined surface shape in the circumferential direction. A restraining portion 21D that restrains the movement of the seat surface 21C along the circumferential direction on 21C is formed in a steeply inclined surface at an intermediate portion of the seat surface 21C corresponding to the coil terminal 24B of the coil end winding portion 24A.

  As shown in FIGS. 2 to 4, the seat rubber 40 has an annular shape that is closely attached to the seat surface 21 </ b> C of the spring seat 21, and includes a thin flat portion 41 on which the coil end winding portion 24 </ b> A of the coil spring 24 is seated. Provided in the circumferential direction. The flat portion 41 has a gently inclined surface shape in the circumferential direction and extends flat, and includes a seat surface 41A having a curvature that substantially follows the roundness of the wire of the coil spring 24 in a cross-sectional view orthogonal to the circumferential direction. The coil end winding portion 24A of the coil spring 24 is seated on the seating surface 41A of the flat portion 41.

  The seat rubber 40 is raised by joining a stopper 50 facing the coil terminal 24B of the coil spring 24 seated on the seating surface 41A of the flat portion 41 on one end side in the circumferential direction of the thin flat portion 41. In this embodiment, the stopper 50 includes a thick protrusion 42 integrally formed with the flat portion 41. The thick protrusion 42 has a steeply inclined back surface supported in close contact with a restraining portion 21D provided at an intermediate portion of the seat surface 21C of the spring seat 21. The sheet rubber 40 is configured by integrally forming a thin flat portion 41 and a thick protrusion 42.

  As shown in FIGS. 2 and 5A, the rising end 42A of the thick projection 42 (stopper 50) with respect to the thin flat portion 41 of the seat rubber 40 is opposed to the coil terminal 24B of the thick projection 42. The front end surface 42B that can be combined is projected by a distance L (for example, 2 mm) toward the coil terminal 24B in the direction along the seating surface 41A of the flat portion 41.

  The seat rubber 40 includes a downward groove 43 that is engaged with the outer peripheral rib 21 </ b> B of the spring seat 21 at a part of the outer peripheral edge.

  In the hydraulic shock absorber 10, the thin flat portion 41 of the seat rubber 40 is loaded in close contact with the seat surface 21 </ b> C of the spring seat 21 in the assembly stage, and the thick wall of the seat rubber 40 is placed on the restraining portion 21 </ b> D of the spring seat 21. The protrusion 42 is supported in close contact with the back surface, and the coil end 24B of the coil spring 24 is seated on the seat surface 41A of the thin flat portion 41 of the seat rubber 40. The coil spring 24 is positioned in the circumferential direction against the 40 thick projections 42 (stopper 50). In addition, when the coil spring 24 is about to move by rotation around its own axis (coil axis) of the coil spring 24 due to compression at the stage of use, the coil terminal 24B of the coil spring 24 is thickly projected on the seat rubber 40. The front end surface 42B of the portion 42 (stopper 50) is abutted and restrained.

At this time, according to the present embodiment, the following effects are obtained.
(a) A front end face 42B that can be brought into contact with the coil terminal 24B of the stopper 50 (thick protrusion 42) with respect to the rising part 42A of the stopper 50 (thick protrusion 42) with respect to the flat part 41 of the seat rubber 40. Was protruded toward the coil terminal 24B in the direction along the seating surface 41A of the flat portion 41. Thus, in a state where the coil terminal 24B of the coil spring 24 is in contact with the stopper 50 (thick protrusion 42) of the seat rubber 40, the coil terminal 24B is removed from the rising portion 42A of the stopper 50 (thick protrusion 42) of the seat rubber 40. The intermediate portion of the flat portion 41 that is separated is pressed. The spring load of the coil spring 24 extends to the middle portion of the flat portion 41 away from the rising portion 42A of the stopper 50 (thick protrusion 42) of the seat rubber 40 via the coil terminal 24B, and this flat portion that is thin and easily stretched. 41 is pushed in at its intermediate part to bend and deform flexibly. The spring load of the coil spring 24 does not generate a shear load at the boundary between the stopper 50 (thick protrusion 42) and the flat portion 41, and bends and deforms the flat portion 41. The load can be taken sufficiently. Therefore, in the spring seat structure of the hydraulic shock absorber 10 in which the flat portion 41 of the seat rubber 40 on which the coil spring 24 is seated is made thin in order to reduce the size and weight of the spring seat, the seat by the spring load of the coil spring 24 is used. Damage to the rubber 40 can be prevented.

  (b) Since the stopper 50 includes the thick protrusion 42 integrally formed with the thin flat portion 41 of the sheet rubber 40, the sheet rubber 40 including the stopper 50 of (a) can be easily manufactured. .

  In addition, the front end surface 42B of the thick protrusion 42 in the seat rubber 40 protrudes by a distance L in the direction along the seating surface 41A of the thin flat portion 41 toward the coil terminal 24B, and the coil terminal 24B of the coil spring 24 becomes the seat rubber. Sitting on and pressing the intermediate portion of the thin flat portion 41 (the point separated from the rising portion 42A along the seating surface 41A of the flat portion 41 by a distance L) away from the rising portion 42A of the 40 thick projection portion 42 Anything that will do. Therefore, the front end surface 42B of the thick protrusion 42 has a substantially upper half portion separated from the rising portion 42A as the front end surface 42B shown in FIG. As shown in Fig. 5C, the arc surface b protrudes from the rising portion 42A, and as the tip surface 42B shown in Fig. 5C, it protrudes obliquely upward from the rising portion 42A and has a triangular shape. What makes the pointed surface c etc. can be employ | adopted. In FIG. 5D, the tip surface 42B of the thick protrusion 42 does not protrude with respect to the rising portion 42A, and a shear load is generated on the rising portion 42A to cause a crack K.

  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 a cross-sectional view of a main part showing a hydraulic shock absorber. FIG. 2 is a side view showing the essential parts of the spring seat and seat rubber of FIG. FIG. 3 is a plan view showing the seat rubber. FIG. 4 is a side view of the seat rubber of FIG. 3 cut along the line IV-IV. FIG. 5 is a schematic diagram showing various forms of sheet rubber.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Hydraulic shock absorber 21 Spring seat 24 Coil spring 24B Coil terminal 40 Seat rubber 41 Thin flat part 41A Seat surface 42 Thick protrusion part 42A Rising part 42B Tip surface 50 Stopper

Claims (2)

In the spring seat structure of the hydraulic shock absorber, the seat rubber is loaded on the spring seat, and the coil spring is seated on the seat surface of the thin flat portion of the seat rubber.
A stopper that faces the coil end of the coil spring is connected to one end of the flat portion of the seat rubber, and is raised.
The hydraulic pressure is characterized in that the leading end surface of the stopper that rises against the coil end of the stopper with respect to the flat portion of the seat rubber protrudes toward the coil end in the direction along the seating surface of the flat portion. Shock absorber spring seat structure.   2. The spring seat structure for a hydraulic shock absorber according to claim 1, wherein the stopper comprises a thick protrusion integrally formed with a thin flat portion of a seat rubber.

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