JP2005256964A - Spring receiving structure of hydraulic shock absorber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To unsophisticatedly prevent rotation caused by compression of a coil spring in a spring receiving structure of a hydraulic shock absorber. <P>SOLUTION: In this spring receiving structure for the hydraulic shock absorber 10, part on the terminal side of a lower end turn section 30 of the coil spring 24 is formed into a bent section 31 with a different curvature different from that of another section 32. Moreover, there are a terminal receiving section 41 colliding with a terminal surface 30A of the lower end turn 30 of the coil spring 24 and a protruding section 42 for supporting the outer periphery of the bent section 31 of the end turn section 30. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a spring receiving structure such as a hydraulic shock absorber.

  As a spring receiving structure of a hydraulic shock absorber, there is one in which a coil spring is sandwiched between upper and lower spring supports of a shock absorber body. Since the coil spring generates a rotational force due to the compressive force, in a general spring receiving structure, the lower spring holder is provided with a terminal receiving portion that abuts the terminal surface of the lower end winding portion of the coil spring in one direction. The spring is prevented from rotating in one direction.

  In this general spring bearing structure, the coil spring can rotate in the other direction, and when the coil spring rotates, noise may be generated due to interference with the lower spring bearing or the like.

Therefore, in the spring receiving structure of Patent Document 1, the lower end winding portion of the coil spring is bent at a right angle to form a first straight portion on the terminal side and a second straight portion following the first straight portion. And while stopping the terminal part of the 1st linear part of a coil spring to a lower spring holder, and providing the restraint part which restrains the outer diameter and inner diameter of a 2nd straight part in a lower spring holder, a coil spring is provided. Prevents rotation in both directions. Such a coil spring is called a D-shaped coil spring.
Special Table 2002-537164

  In the spring support structure of Patent Document 1, it is difficult to create a D-shaped coil spring having a first straight part and a second straight part, and the terminal part of the first straight part is used as a lower spring support. The means to stop the movement is complicated and requires a lot of man-hours.

  An object of the present invention is to easily prevent rotation associated with compression of a coil spring in a spring receiving structure of a hydraulic shock absorber.

  The invention of claim 1 is a spring shock absorber structure for a hydraulic shock absorber in which a coil spring is clamped by upper and lower spring receivers of the shock absorber body. A bent portion having a different curvature relative to the end portion of the lower end winding portion of the coil spring, and a protruding portion that supports the outer periphery of the bent portion of the end winding portion to the lower spring holder. It is provided.

  According to a second aspect of the present invention, in the first aspect of the present invention, the lower spring support is further provided with a restraining portion for restraining the outer diameter and / or inner diameter of the other end winding portion of the coil spring. .

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the bent portion of the lower end winding portion of the coil spring is bent closer to the spring center axis than the other portions.

  According to a fourth aspect of the present invention, in the first aspect of the present invention, a straight portion is further provided at the bent portion of the lower end winding portion of the coil spring.

(Claim 1)
(a) The end surface of the coil spring is supported by the end receiving portion provided on the lower spring support, and the outer periphery of the bent portion of the coil spring is supported by the protrusion provided on the lower spring support, thereby rotating the coil spring in the rotation direction. Can be fixed in both directions. The simple configuration in which the lower end winding portion (terminal surface, bent portion) of the coil spring is engaged with the terminal receiving portion and the protrusion of the lower spring holder can prevent the coil spring from rotating.

(Claim 2)
(b) By providing the lower spring support with a restraining portion for restraining the outer diameter and / or inner diameter of the other portion other than the bent portion of the lower end winding portion of the coil spring, the rotation of the coil spring of (a) described above can be performed. It can be prevented more reliably. Further, it is possible to prevent a lateral displacement of the coil spring with respect to the lower spring support.

(Claim 3)
(c) By bending the bent portion of the lower end winding portion of the coil spring closer to the spring center axis than the other portions, the terminal side portion (the bent portion) of the lower end winding portion of the coil spring is reduced in diameter, The rotation of the coil spring (a) can be prevented without enlarging the lower spring support.

(Claim 4)
(d) By providing a linear portion at the bent portion of the lower end winding portion of the coil spring, the outer periphery of the linear bent portion of the coil spring is supported by the protrusion provided on the lower spring support. The rotation of the coil spring can be prevented more reliably.

  FIG. 1 is a front view showing a hydraulic shock absorber, and FIG. 2 is a plan view showing an attachment structure of a lower end winding portion of a coil spring to a lower spring receiver.

  The hydraulic shock absorber 10 is a strut damper type, and, as shown in FIG. 1, 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 stay 15, upper and lower mount bases 16 </ b> A and 16 </ b> B, and a mount rubber 17, and the stay 15 of this 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 by a steering device (not shown) from the outer tube 11 to a wheel so that the steering can be performed.

  The hydraulic shock absorber 10 uses the outer tube 11 and the piston rod 12 as the shock absorber body of the present invention, and is installed around the piston rod 12 and the lower spring support 21 fixed to the outer periphery of the outer tube 11, and the vehicle body side mounting bracket 14. A coil spring 24 is interposed between the upper spring receiver 22 fixed to the thrust bearing 23 fixed by light press fitting or the like and supported on the back surface by light press fitting or the like. Specifically, the coil spring 24 is supported by the lower spring receiver 21 and is also supported by the upper spring receiver 22 via a spring seat rubber 22A.

  The hydraulic shock absorber 10 has a bump rubber 26 attached to a bump rubber mounting body 25 welded to the lower surface on the inner peripheral side of the upper spring receiver 22 so as to be firmly held below the body mounting bracket 14 of the piston rod 12. Prepare. The hydraulic shock absorber 10 abuts the bump rubber 26 against the bump stopper cap 27 on the upper end surface of the outer tube 11 and restricts the maximum compression stroke during the maximum compression. In this embodiment, the upper end of a cylindrical dust cover 28 is integrally connected to the outer periphery of the lower end of the bump rubber 26, and the dust cover 28 covers the outer tube 11 and the piston rod 12.

  That is, 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.

  The hydraulic shock absorber 10 has a lower spring receiver 21 and an upper spring receiver that receive a lateral force for canceling a side force generated by the coil spring 24 in the outer tube 11 and the piston rod 12 (the shock absorber body) by external input. The coil spring 24 is offset and inclined with respect to the outer tube 11 and the piston rod 12 so as to constitute a side force canceling spring exerted on the outer tube 11 and the piston rod 12 via 22. Here, when the coil spring 24 is offset and inclined with respect to the outer tube 11 and the piston rod 12, the central axis C of the coil spring 24 (which may be a straight axis or a curved shaft) may be the outer tube 11 and the piston rod. 12 is inclined with respect to the center axis A of 12 and the center axis C of the coil spring 24 is offset with respect to the center axis A of the lower spring receiver 21 (which is also the center axis of the outer tube 11). The central axis of the coil spring 24 substantially matches the central axis of the upper spring receiver 22 that is coaxial with the piston rod 12.

However, the hydraulic shock absorber 10 has the following configuration in order to prevent rotation associated with compression of the coil spring 24 (FIG. 2).
In addition, as the coil spring 24, the one having the lower effective end winding portion 30 of 1/2 winding is used.

  (1) A part 31 on the terminal side of the lower end winding part 30 of the coil spring 24 is a bent part having a curvature different from that of the other part 32. The curvature of the other portion 32 has the same curvature (same coil diameter) as the curvature of the effective winding portion (portion following the effective end winding portion 30) of the coil spring 24.

  In this embodiment, the bent portion 31 of the lower end winding portion 30 of the coil spring 24 is bent closer to the central axis C of the coil spring 24 than the other portions 32. Furthermore, at least a part of the bent portion 31, in this embodiment, the whole is a linear portion. When the element wire diameter of the coil spring 24 is 10 mm and the coil average diameter is 60 mm, the length of the bent portion 31 is, for example, 20 to 30 mm.

  (2) The lower spring receiver 21 has a terminal receiving portion 41 that abuts the terminal surface 30A of the lower end winding portion 30 of the coil spring 24 on the seat surface 40 on which the effective end winding portion 30 of the coil spring 24 is seated. A protrusion 42 that supports the outer periphery of the bent portion 31 of the end winding portion 30 is provided.

  In the present embodiment, the terminal receiving portion 41 is raised by cutting off a part of the lower spring receiver 21. The protrusion 42 was formed by pressing a part of the lower spring receiver 21 into a protrusion.

  (3) The lower spring receiver 21 is an outer surface that restrains the outer diameter and inner diameter of the other portion 32 of the lower end winding portion 30 of the coil spring 24 on the seat surface 40 on which the effective end winding portion 30 of the coil spring 24 is seated. A diameter restricting portion 43 and an inner diameter restricting portion 44 are provided. The outer diameter restricting portion 43 and the inner diameter restricting portion 44 can be formed on both side groove surfaces of an arcuate groove portion 45 formed by press molding a part of the lower spring receiver 21.

  The lower spring receiver 21 includes a rib 24 </ b> A that restrains the outer diameter of the coil spring 24 over the entire outer periphery of the seat surface 40. Further, the spring seat rubber 22 </ b> A of the upper spring receiver 22 includes a spring holding portion 22 </ b> B for inserting and holding the upper effective end winding portion 24 </ b> A of the coil spring 24.

  Accordingly, in the hydraulic shock absorber 10, the lower spring receiver 21 is mounted on the seat surface 40 on which the effective end winding part 30 of the coil spring 24 is seated as shown in FIG. A support portion 40B and a 1/2 turn support portion 40C are provided, a terminal receiving portion 41 is provided on the spring start end support portion 40A, a 1/4 turn support portion 40B is disposed outside the vehicle body, and the seat surface 40 is supported by a 1/4 turn. An inclined flat surface having a downward slope from the portion 40B toward the central axis A of the lower spring receiver 21 (also the central axis of the outer tube 11), and the center B of the seating surface 40 that coincides with the central axis C of the coil spring 24 It is offset (eccentric amount e) with respect to the central axis A of the spring receiver 21.

According to the present embodiment, the following operational effects can be obtained.
(a) The terminal surface 30 </ b> A of the coil spring 24 is supported by the terminal receiver 41 provided on the lower spring receiver 21, and the outer periphery of the bent portion 31 of the coil spring 24 is supported by the protrusion 42 provided on the lower spring receiver 21. Thus, the coil spring 24 can be fixed in both directions in the rotational direction. The coil spring 24 is rotated by a simple configuration in which the lower end winding portion 30 (the terminal surface 30A, the bent portion 31) of the coil spring 24 is engaged with the terminal receiving portion 41 and the protrusion 42 of the lower spring receiving portion 21. Can be prevented.

  (b) By providing the lower spring receiver 21 with the restraining portions 43 and 44 for restraining the outer diameter and inner diameter of the portion 32 other than the bent portion 31 of the lower end winding portion 30 of the coil spring 24, the above-described (a). The rotation of the coil spring 24 can be prevented more reliably. Further, it is possible to prevent the lateral displacement of the coil spring 24 with respect to the lower spring receiver 21.

  (c) By bending the bent portion 31 of the lower end winding portion 30 of the coil spring 24 closer to the spring center axis C than the other portion 32, the end side portion of the lower end winding portion 30 of the coil spring 24 ( The rotation of the coil spring 24 (a) can be prevented without reducing the diameter of the bent portion 31) and without increasing the size of the lower spring receiver 21.

  (d) By providing a linear portion at the bent portion 31 of the lower end winding portion 30 of the coil spring 24, the outer periphery of the linear bent portion 31 of the coil spring 24 is supported by the protrusion 42 provided at the lower spring receiver 21. In addition, the rotation of the coil spring 24 of the above (a) can be prevented more reliably.

  Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration of the present invention is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. Is included in the present invention. For example, the present invention can be applied not only to a spring receiving structure using a side force canceling spring but also to a spring receiving structure using a general suspension spring.

FIG. 1 is a front view showing a hydraulic shock absorber. FIG. 2 is a plan view showing the attachment structure of the lower end winding portion of the coil spring to the lower spring receiver.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Hydraulic buffer 11 Outer tube 12 Piston rod 21 Lower spring receiver 22 Upper spring receiver 24 Coil spring 30 End winding part 30A Terminal surface 31 Bending part 32 Other parts 40 Seat surface 41 Terminal receiving part 42 Projection part 43 Outer diameter restraint part 44 Inner diameter restraint part

Claims (4)

In the spring receiving structure of the hydraulic shock absorber that holds the coil spring by the upper and lower spring supports of the shock absorber body,
A part on the terminal side of the lower end winding part of the coil spring is a bent part having a different curvature from the curvature of the other part,
A hydraulic shock absorber characterized in that a terminal receiving portion that abuts the terminal surface of the lower end winding portion of the coil spring and a protrusion that supports the outer periphery of the bent portion of the end winding portion are provided on the lower spring receiving portion. Spring bearing structure.   The spring receiving structure for a hydraulic shock absorber according to claim 1, wherein a constraining portion for constraining an outer diameter and / or an inner diameter of another part of the lower end winding portion of the coil spring is provided in the lower spring support.   The spring receiving structure for a hydraulic shock absorber according to claim 1 or 2, wherein a bent portion of the lower end winding portion of the coil spring is bent closer to the spring center axis than other portions.   The spring receiving structure for a hydraulic shock absorber according to any one of claims 1 to 3, wherein a linear portion is provided at a bent portion of the lower end winding portion of the coil spring.

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