JP2007276685A - Suspension structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily assemble a suspension structure coaxially holding a shock absorber and a coil spring to a vehicle body frame. <P>SOLUTION: A positioning support 26 is provided, which has a cylinder portion 27 capable of fitting with the inside of an upper end portion of a coil spring 2, forms a throat portion 29 capable of fitting with a downward projecting portion of a mount 9 on an upper surface by expanding the upper end of the cylinder portion 27 outward, and has a flange portion 28 having a lower surface abutting on an upper end surface of the coil spring 2. Furthermore, on an outer peripheral surface portion of a retainer 24, a positioning abut portion 33 abutting on an inner surface of the throat portion 29 of the positioning support 26 wherein the cylinder portion 27 is fitted with the inside of the upper end portion of the coil spring 2 is formed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a suspension structure.

  The main role of the suspension is to ground the tire properly and to catch the movement of the tire that moves up and down following the unevenness of the road surface to reduce the vibration of the passenger compartment and the loading platform.

  FIG. 3 shows an example of a coil spring type suspension structure, in which a lower end portion of a coil spring 2 that should be positioned coaxially with respect to the shock absorber 1 is attached to a spring seat 4 that is externally fixed to the tube 3 of the shock absorber 1. The upper end portion of the coil spring 2 is brought into contact with the lower surface of the outer peripheral portion of the fixed plate 6 fixed to the piston rod 5 of the shock absorber 1 via the fastening means 34 via the bumper rubber 11. The eye 7 provided at the lower end of the tube 3 is pivotally supported by a lower arm or a lower link (not shown) that swings up and down together with the wheel, and the fixing plate 6 is fixed to a mount 9 fixed to the vehicle body frame 8. Yes.

  The fixed plate 6 has a hole 6a through which the piston rod 5 is inserted in a central portion, and a downward convex portion 12 protruding downward is formed around the hole 6a.

  Fastening means 34 for fixing the fixing plate 6 to the piston rod 5 is inserted into the piston rod 5 and placed on the boss 13 of the piston rod 5. Screws formed on the upper end of the piston rod 5, the lower mount bush 15 to be inserted, the retainer 16 having a rising portion 16 a that fits into the hole 6 a of the fixed plate 6, the upper mount bush 17, the upper plate 18, and the piston rod 5. And a fixing nut 10 that is screwed into the portion. When the fixing nut 10 is tightened with the downward projection 12 of the fixing plate 6 held between the retainer 16 and the upper mounting bush 17, the fixing plate 6 is fixed to the upper mounting bush 17 and the lower mounting bush 15. The shock absorber 1 and the coil spring 2 are assembled coaxially by the positions of the fixing plate 6 and the fastening means 34 being determined by the rising portion 16a of the retainer 16 that is fixed by compression of the retainer 16 and fitted into the hole 6a. It has become.

  A plurality of fixing bolts 19 for fixing the fixing plate 6 to the mount 9 are provided on the periphery of the fixing plate 6.

  In order to assemble the suspension structure to the mount 9 of the vehicle body frame 8, the eye 7 at the lower end of the shock absorber 1 is pivotally supported by a lower arm or a lower link (not shown) while the vehicle body frame 8 is raised. By lowering the vehicle body frame 8 in a state where the large-diameter opening 20 and the fastening means 34 at the upper end of the piston rod 5 are aligned, the fastening means 34 passes through the opening 20 of the mount 9, and at the same time, A plurality of fixing bolts 19 provided in the circumferential direction of the fixing plate 6 are passed through the bolt holes 21 formed in the mount 9 so as to pass through, and nuts 22 are screwed into the fixing bolts 19 to be assembled. .

Patent Documents 1 and 2 show the general technical level related to the suspension structure. Patent Document 3 discloses a coil spring provided with seats made of sheet rubber and a rigid plate at both ends.
JP 07-117429 A JP 2001-121933 A JP 2001-248664 A

  However, as shown in FIG. 3, in the assembling method in which the fixing plate 6 is fixed to the lower surface of the mount 9 using the plurality of fixing bolts 19, the fixing bolts are fixed to the bolt holes 21 of the mount 9 when the suspension structure is assembled. The fixing plate 6 is aligned so that each of 19 is inserted, the fixing bolt 19 is inserted into the bolt hole 21, and the nut 22 is screwed and fastened to each of the inserted fixing bolts 19. In addition, since the positioning operation is not easy, the productivity is low.

  Further, Patent Document 1 and Patent Document 2 do not disclose assembly of the suspension structure to the vehicle body frame at all.

  On the other hand, Patent Document 3 shows a configuration in which seats made of sheet rubber and a rigid plate are provided at both ends of a coil spring. In the specification, upper and lower brackets include coil springs. Sheet rubbers for receiving the upper and lower ends are respectively bonded, and these sheet rubbers are formed in a ring shape. As described in the description that the spring metal seat and the rubber seat constitute the spring seat, the seat is a part of the spring seat, and the suspension structure is assembled to the vehicle body frame. Is not disclosed at all.

  The present invention has been made in view of the above-described circumstances, and can improve productivity by easily assembling a suspension structure to a vehicle body frame in a component set state in which a shock absorber and a coil spring are held coaxially. Its purpose is to provide a structure.

The suspension structure of the present invention includes a coil spring that surrounds the shock absorber in the circumferential direction,
A spring seat attached to the shock absorber tube and on which the lower end of the coil spring rests;
A mount fixed to the vehicle frame and provided with a connecting hole and a convex portion;
Fastening means for fastening the piston rod to the mount, comprising an upper mount bush disposed on the upper surface of the convex portion of the mount, and a lower mount bush disposed on a lower surface of the convex portion via a retainer;
A suspension structure with
The cylinder spring has a cylindrical portion that can be fitted inside the upper end portion of the coil spring, and a throat portion that can fit the downward convex portion is formed on the upper surface by expanding the upper end of the cylindrical portion to the outer side, and the lower surface is formed. A positioning support having a flange portion that comes into contact with the upper end surface of the coil spring is provided, and the throat portion of the positioning support in which a cylindrical portion is fitted inside the upper end portion of the coil spring on the outer peripheral portion of the retainer. A positioning contact portion that contacts the inner surface is formed.

  When handling the suspension structure, the cylindrical portion of the positioning support is dropped inside the upper end of the coil spring. At that time, by setting the inner diameter of the lower mounting bush to be smaller than the outer diameter of the piston rod, the lower mounting bush can be temporarily fixed, and the positioning contact part of the retainer is the throat part of the positioning support. Since the shock absorber and the coil spring are held in a coaxially positioned component set state, the positioning support is prevented from floating or coming off.

  When fastening and assembling the shock absorber piston rod to the mount, tighten the fixing nut so that the mount is held between the retainer and the upper mount bush. Thus, the suspension structure can be assembled to the vehicle body frame with the shock absorber and the coil spring positioned coaxially by a simple operation of tightening the fixing nut 10, so that the assembly work of the suspension structure can be remarkably simplified.

  In the suspension structure, it is preferable that the retainer is bonded to the lower mount bush, and in this configuration, the retainer and the lower mount bush can be handled integrally.

  In the above suspension structure, the positioning support preferably has a configuration in which the outer surface of the rigid plate is covered with rubber rubber. In this configuration, the strength is held by the rigid plate, and the metal of the coil spring and the mount is held by the rubber rubber on the outer surface. Abnormal noise due to touch can be prevented.

  According to the suspension structure of the present invention, the cylinder portion of the positioning support is dropped inside the upper end portion of the coil spring during handling such as transportation. At that time, by setting the inner diameter of the lower mounting bush to be smaller than the outer diameter of the piston rod, the lower mounting bush can be temporarily fixed, and the positioning contact part of the retainer is the throat part of the positioning support. Since the shock absorber and the coil spring are held in a coaxially-positioned component set state, the positioning support can be prevented from floating or coming out when handling the suspension structure. There is.

  When the piston rod of the shock absorber is fastened to the mount by the fastening means, when the fixing nut is tightened with the mount held between the retainer of the fastening means and the upper mount bush, the positioning contact portion of the retainer becomes The shock absorber and coil spring are automatically positioned coaxially and fixed in contact with the inner surface of the positioning support throat, so the assembly work of the suspension structure can be simplified with a simple configuration, and productivity There is an effect that can be greatly improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 and 2 show an example of the suspension structure of the present invention. The same components as those in FIG. 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the form of FIG. 1, the piston rod 5 of the shock absorber 1 is fastened to a mount 9 fixed to the vehicle body frame 8 by fastening means 34 provided on the piston rod 5.

  For this reason, the mount 9 is formed with a downward convex portion 23 having an upper receiving surface 23a to which the upper mount bush 17 of the fastening means 34 is fitted on the upper surface, and at the center of the downward convex portion 23, A small-diameter connecting hole 25 through which the piston rod 5 and the rising portion 24a at the center of the retainer 24 can pass is formed.

  On the other hand, a positioning support 26 is provided that is fitted and placed on the upper end of the coil spring 2 that should be coaxial with the shock absorber 1. The positioning support 26 includes a cylindrical portion 27 that can be fitted with a predetermined gap inside the upper end portion of the coil spring 2, and a flange that has an upper end that forms a curved surface and is expanded outward. Accordingly, the positioning support 26 forms a throat portion 29 whose diameter is reduced downward from the upper surface of the flange portion 28 to the inner surface of the cylindrical portion 27. The lower surface of the flange portion 28 of the positioning support 26 is placed in contact with the upper end surface of the coil spring 2.

  The positioning support 26 has a configuration in which an outer surface of, for example, a metal rigid plate 30 formed in a throat shape is covered with a rubber rubber 31.

  The retainer 24 extends from the lower end of the rising portion 24a along the upper surface of the lower mount bush 15 in the horizontal direction and is bent downward to be engaged with the lower mount bush 15. A positioning contact portion 33 extending outward from the step portion 32 and contacting the lower inner surface of the curved throat portion 29 of the positioning support 26 is formed on the peripheral portion thereof. Forming. The retainer 24 has a configuration in which it is integrally bonded to the upper surface of the lower mound bush 15. The inner diameter of the lower mount bush 15 is set slightly smaller than the outer diameter of the piston rod 5.

  According to the said form, it acts as follows.

  When handling the suspension structure or the like, as shown in FIG. 2, the cylindrical portion 27 of the positioning support 26 is dropped inside the upper end portion of the coil spring 2, and the flange portion 28 is placed on the upper end of the coil spring 2. Further, the lower mount bush 15 having the retainer 24 bonded thereto is pushed into the piston rod 5 of the shock absorber 1 and inserted into the piston rod 5 to be temporarily fixed. Then, since the positioning contact portion 33 of the retainer 24 contacts the inner surface of the throat portion 29 of the positioning support 26, the shock absorber 1 and the coil spring 2 are held coaxially. Thus, the problem of being damaged or coming out is prevented.

  When the piston rod 5 of the shock absorber 1 is fastened and assembled to the mount 9 of FIG. 1, first, the body frame 8 is raised and the eye 7 at the lower end of the shock absorber 1 shown in FIG. The suspension structure is held upright by being pivotally supported by the lower arm or the lower link.

  Next, the rising portion 24 a of the retainer 24 and the connecting hole 25 of the mount 9 are aligned and the vehicle body frame 8 is lowered, whereby the rising portion 24 a of the piston rod 5 and the retainer 24 is inserted into the connecting hole 25 of the mount 9. Thus, the mount 9 is placed on the retainer 24. Subsequently, when the upper mount bush 17 and the upper plate 18 are inserted into the piston rod 5 and the fixing nut 10 is attached to the piston rod 5 and tightened, the mount 9 is clamped by the retainer 24 and the upper mount bush 17.

  At this time, the positioning contact portion 33 of the retainer 24 contacts the inner surface of the throat portion 29 of the positioning support 26 so that the positioning support 26 is held coaxially with respect to the shock absorber 1. Since the downward projecting portion 23 of the mount 9 is fitted to the throat portion 29 of the 26 and positioned, the shock absorber 1 and the coil spring 2 are automatically positioned coaxially and fastened, and a lateral force is applied to the suspension structure. Even in the case of the action, the shock absorber 1 and the coil spring 2 are reliably held coaxially by the structure in which the downward convex portion 23 of the mount 9 is fitted to the throat portion 29 of the positioning support 26.

  Therefore, according to the above embodiment, the suspension structure is assembled to the vehicle body frame 8 with the shock absorber 1 and the coil spring 2 positioned coaxially by a simple operation of temporarily assembling the lower mount bush 15 to which the retainer 24 is bonded. Therefore, the assembly work of the suspension structure can be simplified and the productivity can be greatly improved.

  In addition, since the retainer 24 is bonded to the lower mount bush 15, the retainer 24 and the lower mount bush 15 can be handled integrally, so that the number of work steps can be reduced.

  Further, since the positioning support 26 has a configuration in which the outer surface of the rigid plate 30 is covered with the rubber rubber 31, the strength is maintained by the rigid plate 30, and the coil spring 2, the mount 9, and the retainer 24 are retained by the outer rubber rubber 31. Therefore, there is no problem of abnormal noise and concerns over aging.

  In the above description, the case where the vehicle body frame 8 is raised and lowered when the suspension structure is assembled has been described. However, the lower arm or the lower link side to which the eye 7 is attached may be raised and lowered.

  It should be noted that the suspension structure of the present invention is not limited to the above-described embodiment, and it goes without saying that modifications can be made without departing from the scope of the present invention.

  The suspension structure of the present invention can be applied to various vehicle types.

It is a longitudinal cross-sectional view which shows an example of the suspension structure of this invention. It is sectional drawing which shows the components set state at the time of conveyance of the suspension structure of FIG. It is a longitudinal section showing an example of a coil spring type suspension.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shock absorber 2 Coil spring 4 Spring seat 5 Piston rod 8 Body frame 9 Mount 10 Fixing nut 15 Lower side mounting bush 17 Upper side mounting bush 23 Downward convex part 23a Upper receiving surface 24 Retainer 25 Connecting hole 26 Positioning support 27 Cylindrical part 28 Flange Part 29 Throat part 30 Rigid plate 31 Rubber rubber 33 Positioning contact part 34 Fastening means

Claims (3)

A coil spring that surrounds the shock absorber in the circumferential direction;
A spring seat attached to the shock absorber tube and on which the lower end of the coil spring rests;
A mount fixed to the vehicle frame and provided with a connecting hole and a convex portion;
Fastening means for fastening the piston rod to the mount, comprising an upper mount bush disposed on the upper surface of the convex portion of the mount, and a lower mount bush disposed on a lower surface of the convex portion via a retainer;
A suspension structure with
The cylinder spring has a cylindrical portion that can be fitted inside the upper end portion of the coil spring, and a throat portion that can fit the downward convex portion is formed on the upper surface by expanding the upper end of the cylindrical portion to the outer side, and the lower surface is formed. A positioning support having a flange portion that comes into contact with the upper end surface of the coil spring is provided, and the throat portion of the positioning support in which a cylindrical portion is fitted inside the upper end portion of the coil spring on the outer peripheral portion of the retainer. A suspension structure characterized in that a positioning contact portion that contacts an inner surface is formed.   The suspension structure according to claim 1, wherein the retainer is bonded to a lower mount bush.   The suspension structure according to claim 1 or 2, wherein the positioning support has a configuration in which an outer surface of a rigid plate is covered with rubber rubber.

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