JP2005265154A - Mounting structure of dust cover in hydraulic shock absorber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide mounting structure of a dust cover in a hydraulic shock absorber, for forming an assembly of the dust cover with a bearing and a spring seat to improve assembly property, stably holding the spring seat with the dust cover, and preventing intrusion of dust or rain water from under the dust cover. <P>SOLUTION: The spring seat A is held on a vehicle-body-side mount C through a bearing 19, and the dust cover is disposed inside the spring seat A. The dust cover 23 is constituted of a cylinder body 24; a support part 25 disposed horizontal/substantially horizontal to and continuous to an upper part of the cylinder body 24; a cylindrical part 26 continuous to an upper part of the support part 25; and an annular hook part 27 with U-shaped cross section continuous to an upper part of the cylindrical part 26. A lower surface of the spring seat A is supported by the support part 25, and the annular hook part is locked to an inner circumferential side step part a of the bearing 19. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a dust cover mounting structure that is disposed outside a cylinder and a piston rod and prevents dust from entering the cylinder in a hydraulic shock absorber.

  Generally, a suspension in a vehicle such as an automobile has a hydraulic shock absorber and a suspension spring, and the suspension spring is supported at the upper end by an upper spring seat, and this upper spring seat is held on the vehicle body side mount via a bearing. ing.

  Further, a dust cover is disposed outside the hydraulic shock absorber, that is, outside the piston rod and the cylinder, and the dust cover prevents dust from entering the cylinder.

  As this type of dust cover mounting structure, for example, a structure disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2002-89606) has been developed.

  In other words, the upper spring seat is held on the vehicle body side mount via a bearing, and a bellows type dust cover is disposed inside the upper spring seat. Between them.

Furthermore, the lower end cylindrical portion of the dust cover is opened while being suspended in parallel to the outside of the cylinder.
Japanese Patent Laid-Open No. 2002-89606 (FIG. 2)

  The dust cover mounting structure disclosed in Patent Document 1 is not particularly functionally defective, but it is desired to improve the following problems.

  First, because the bearing, spring seat, and dust cover are independent and are only stacked and sandwiched on the bump rubber in sequence, the three cannot be assembled and cannot be assembled at the same time. Inferiority.

  Secondly, since the dust cover and the spring seat are only supported on the bump rubber, the holding force is weak and the stability is poor.

  Thirdly, since the lower end of the dust cover is left open, the lower part is hung and the stability is low, and dust and rainwater may enter from below.

  Therefore, the present invention assembles the dust cover together with the bearing and the spring seat to improve the assemblability, can stably hold the spring seat together with the dust cover, and dust and rainwater enter from below the dust cover. An object of the present invention is to provide a dust cover mounting structure in a hydraulic shock absorber that prevents the above-described problem.

  In order to achieve the above object, the means of the present invention is a hydraulic shock absorber in which a spring seat is held on a vehicle body side mount via a bearing, and a dust cover is disposed inside the spring seat. It consists of a cylindrical main body, a horizontal or substantially horizontal support portion provided continuously with the upper portion of the main body, a cylindrical portion continuous with the upper portion of the support portion, and a hooking portion continuous with the upper portion of the cylindrical portion. The hooking portion is supported by the inner peripheral side step portion of the bearing.

  According to the present invention, the following effects can be obtained.

  1) According to the invention of each claim, the dust cover is hooked on the stepped portion of the bearing via the hook portion, and the spring seat is held by the bearing and supported by the support portion of the dust cover. As a result, the dust cover and spring seat can be assembled, and the three members can be attached to the hydraulic shock absorber at the same time.

  2) Similarly, since the dust cover is hooked on the bearing side and the spring seat is held by the bearing and the dust cover, the dust cover and the spring seat can be stabilized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the hydraulic shock absorber according to the present invention, as shown in FIGS. 1 and 2, a spring seat A is mounted on a vehicle body side mount C via a bearing 19. The dust cover is disposed inside the spring seat A.

  As shown in FIG. 3, the dust cover 23 includes a bellows-shaped cylindrical main body 24, a horizontal or substantially horizontal support portion 25 provided continuously with the upper portion of the main body 24, and a cylindrical portion 26 continuous with the upper portion of the support portion 25. And an annular hooking portion 27 having a U-shaped cross section that is continuous with the upper portion of the cylindrical portion 26.

  As shown in FIG. 2, the lower surface of the spring seat A is supported by the support portion 25, and the hook portion 27 is locked to the inner peripheral side step portion a (FIG. 5) of the bearing 19.

  In this case, the cylindrical main body 23 is formed in a bellows type, and a trumpet type support piece 28 is formed at the lower end of the main body 23. The support piece 28 is brought into contact with an inclined portion 30 provided at the lower end portion of the cap 29.

  Since the dust cover 23 is hooked on the bearing 19 and also supports the spring seat A, the three can be made into a cartridge and assembled at the same time.

  In addition, since the dust cover 23 is supported even below, the stability of the dust cover 23 spring sheet A can be improved, and the lower portion of the dust cover 23 is sealed by the inclined portion 29, so that the dust cover 23 can be dusted from below. And rainwater can be prevented from entering.

  As shown in FIG. 4, the spring seat A is a spring seat that supports the vehicle body side mount, and includes a cylindrical portion 1, a flange portion 2 that is integrally connected to the upper end of the cylindrical portion 1, and an outer periphery of the flange portion 2. It consists of a spring guide portion 3 provided integrally with the outer periphery of the tube portion 1 and provided with a guide groove 3b facing the outer surface of the tube portion 1, and is made of a rubber material.

  The spring guide portion 3 is integrally connected to the outer periphery of the flange portion 2, and the lower end support portion 3 a is integrally connected to the outer periphery of the cylindrical portion 1, whereby the suspension spring 11 is opposed to the outer surface of the inner cylindrical portion 1. A guide groove 3b is formed through which is inserted.

  Further, an end holding member 7 of a spring S including a vertical stop piece 5 and a horizontal guide piece 6 is integrally provided on the outer periphery of the cylindrical portion 1. Further, an annular protrusion 1 a is formed in the middle of the inner periphery of the tube portion 1, and an annular support piece 1 b is formed at the lower end of the inner periphery of the tube portion 1.

  The suspension device B is interposed between a strut type shock absorber 9 attached to the wheel side bracket 8, an upper spring seat A held on the vehicle body side mount C, and a lower spring seat 10 attached to the outer periphery of the shock absorber 9. The suspension spring 11 is mounted.

  The mount C includes an inner base 13 coupled to the vehicle body via bolts 12, a cover 14 coupled to the lower portion of the inner base 13 via bolts 12, and a mount coupled between the inner base 13 and the cover 14. The inner rubber 16 is held in the rubber 15.

  The center of the inner rubber 16 of the mount C passes through the piston rod 17 of the shock absorber 9, and the tip of the piston rod 17 is fixed to the inner rubber 16 via a nut, whereby the piston rod 17 is coupled to the vehicle body side. .

  The cover 14 has a centered bottomed cylindrical portion 14a, a horizontal plate portion 14b continuously provided at the upper end of the cylindrical portion 14a, and a plurality of locking holes 14c spaced from the body portion of the cylindrical portion 14a in the circumferential direction. It consists of and.

  A bump rubber 18 is coupled to the lower surface of the cylindrical portion 14 a of the cover 14, and the piston rod 17 passes through the center of the bump rubber 18, and the upper end of the cylinder of the shock absorber 9 is near the bump rubber 18 near the most compressed state of the shock absorber 9. The cushion is effective by colliding with.

  A bearing 19 is fitted and held on the outer cylinder of the cylinder portion 14a of the cover 14, and a rubber spring seat A according to the present invention is fitted and held on the outer periphery of the lower portion of the bearing 19. The upper end of the suspension spring 11 is carried.

  As shown in FIGS. 2 and 5, the bearing 19 includes a rubber annular inner body 20, a rubber annular outer body 21, and a ball bearing interposed between the inner body 20 and the outer body 21. 22.

  The inner body 20 includes an annular main body 20a, a skirt-like cover 20b provided continuously with the outer periphery of the main body 20a, and hooks 20c spaced at equal intervals on the inner periphery of the main body 20a.

  The outer body 21 includes an annular main body 21a, a curved surface 21b formed on the outer periphery of the main body 21a, an annular groove 21c formed on the outer periphery of the main body 21a, and a locking projection 21d formed on the inner periphery of the main body 21a at equal intervals. The locking projection 21d includes a stepped portion a and a tapered guide surface b.

  The ball bearing 22 includes a pair of upper and lower sandwiching pieces 22a and 22b and a ball 22c rotatably held between the sandwiching pieces 22a and 22b. The outer body 21 is connected to the inner body 20 via the balls 22c. In one direction. For this reason, when the suspension spring 11 expands and contracts and the upper end of the suspension spring 11 rotates, the spring seat A and the outer body 21 interlocked therewith can be rotated.

  When the bearing 19 is fitted to the outer periphery of the cover 14, as shown in FIG. 6, the inner body 20 enters in the direction of the arrow X, and at this time, the hook 20 c moves while being crushed in the direction of the arrow Y. When it reaches the position of the locking hole 14c, it is fitted into the locking hole 14c by self-restoring force. So that it is prevented from falling off.

  The upper end portion of the dust cover 23 is fitted and held on the inner periphery of the outer body 21 of the bearing 19. In this case, the hooking portion 27 formed on the dust cover 23 is a locking projection 21 d on the inner periphery of the outer body 21. The downward inclined portion 26a of the cylindrical portion 26 is in contact with the guide surface b of the locking projection 21d.

  The spring seat A is fitted to the outer periphery of the outer body 21 in the bearing 19. At this time, the inner curved surface 21 b of the outer body 21 is fitted to the inner circumferential surface of the spring seat A, in other words, the inner circumference of the cylindrical portion 1. The surface and the upper surface of the flange portion 2 are in close contact.

  Further, the inner peripheral annular protrusion 1 a of the spring seat 2 is fitted into the annular groove 21 c of the outer body 21, and the annular support piece 1 b at the lower end of the inner periphery of the spring seat 2 is also fitted to the lower end surface of the outer body 21. It is in contact.

  At this time, the ring-shaped support piece 1b abuts the bellows portion of the dust cover 23 on the lower end, whereby the spring seat 2 can be more reliably held on the bearing 19 side.

  The suspension spring 11 has a coil shape, and the uppermost spiral portion of the suspension spring 11 enters while being guided by a guide groove 3b formed inside the spring guide portion 3 of the spring seat A, in other words, the cylindrical portion. 1 is wound around the outer periphery of 1, and the end of the coil end is in contact with the stopper piece 5.

  At this time, the lower part of the spiral portion is supported by the guide piece 6 and prevented from falling downward. In particular, since the rib 6a and the flange are formed at the upper end of the guide piece 6, the rib 6a The flange portion 2 is clamped more firmly by a suspension spring.

  Further, the rib 6a reinforces the guide piece 6, prevents the guide piece 6 from being pinched downward or deformed, and prevents the upper end portion of the suspension spring 11 from falling downward. .

  Since the spring guide portion 3 is integrally connected to the flange portion 2 and the cylindrical portion 1, the guide groove 3b does not open. Therefore, the spring guide portion 3 is guided while guiding the upper spiral portion of the suspension spring 11 in the circumferential direction. While the suspension spring 11 is guided in the lateral direction, the suspension spring 11 is prevented from being displaced or pulled out in the lateral direction.

  In other words, the spring seat A is made of rubber, and even if a biased load acts on the entire spring seat A to be slightly distorted or a lateral load acts on the spring guide 3 from the suspension spring 11, the spring guide 3 itself is Since the guide groove 3b is not always opened by being integrally coupled to the flange portion 2 and the cylindrical portion 1, the suspension spring 11 is prevented from being displaced laterally and falling off as a result.

It is a partial longitudinal front view of a hydraulic shock absorber provided with a dust cover according to the present invention. It is a partially expanded sectional view of FIG. It is an enlarged vertical front view of a dust cover. It is a partially cutaway perspective view of a spring seat. It is an enlarged vertical front view of pairing. It is a partially expanded sectional view which shows the fitting state of a bearing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tube part 2 Flange part 3 Spring guide part 3a Support piece 3b Guide groove 5 Stop part 6 Guide piece 7 End part holding member 1a Annular protrusion 1b Annular support piece 19 Bearing 23 Dust cover 24 Cylindrical main body 25 Support part 26 Cylindrical part 27 Hook 28 Support piece 29 Cap 30 Inclined part A Spring seat C Mount

Claims (3)

In a hydraulic shock absorber in which a spring seat is held on a vehicle body side mount via a bearing, and a dust cover is disposed inside the spring seat, the dust cover is a horizontal or continuous connection with a cylindrical main body and an upper portion of the main body. It consists of a substantially horizontal support part, a cylindrical part connected to the upper part of the support part, and a hook part connected to the upper part of the cylindrical part. The spring part is supported by the support part, and the hook part is used as an inner peripheral step of the bearing. A dust cover mounting structure in a hydraulic shock absorber, characterized in that it is locked. The dust cover mounting structure for a hydraulic shock absorber according to claim 1, wherein the cylindrical main body is formed in a bellows shape, and a trumpet-shaped support piece is formed at a lower end of the main body. The bearing is composed of an inner body, an outer body, and a ball bearing interposed between the inner body and the outer body, and a spring seat includes a cylindrical portion and a flange portion integrally connected to the upper end of the cylindrical portion. A cylindrical portion and a flange portion of the spring seat are fitted to the outer periphery of the outer body, the lower surface of the cylindrical portion is supported by the support portion of the dust cover, and the annular step portion formed on the inner periphery of the outer body The attachment structure of the dust cover in the hydraulic shock absorber according to claim 1 or 2, wherein a hooking portion of the dust cover is locked.

Images