JP2007118889A - Vehicular suspension - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular suspension which is easily assembled without any fall or movement of a resin-made bearing during assembly work. <P>SOLUTION: A hook 43 as a hooking part is formed on a resin-made bearing 40 as a shock-absorbing body. By coiling an annular elastic body 50 to be hooked to the hook around a lower arm 10, the resin-bearing 40 is connected to the lower arm 10. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

 The present invention relates to a vehicle suspension having an arm slidably coupled to a vehicle body.

  As shown in FIG. 15, the McPherson strut suspension for suspending the vehicle rotates through a front bush 220, which is a rubber elastic member, near the side end of the suspension cross member 201 extending in the vehicle width direction. The lower arm 210 is connected freely and is rotatably connected to a vehicle body behind the suspension cross member 201 via a rear bush 212.

  16 is a cross-sectional view taken along the line XVI-XVI in FIG. An outer cylinder 211 is welded to the lower arm 210. The front bush 220 is vulcanized and bonded to the outer peripheral surface of the inner cylinder 230. The front bush 220 is press-fitted into the outer cylinder 211 of the lower arm 210. The inner cylinder 230 is fixed between two opposing sides of the suspension cross member 201 having a substantially U-shaped cross section by a bolt 202 penetrating the inner cylinder 230 and a nut 203 screwed into the bolt 202. . Thus, the lower arm 210 is connected to the suspension cross member 201 via the front bush 220 so as to be able to swing.

  At the connecting portion between the suspension cross member 201 and the lower arm 210 described above, the outer cylinder 211 moves in the axial direction with respect to the suspension cross member 201 due to a change with time of bushes or the like or an external force applied to the suspension during traveling. There are things to do. When the outer cylinder 211 moves in the axial direction and the end of the bush 220 or the outer cylinder 211 is pressed against the inner wall of the suspension cross member 201, noise is generated. In addition, a change in the connection position of the lower arm 210 with respect to the suspension cross member 201 causes a suspension alignment error, which causes uneven wear of the tire and deterioration of running stability.

As a technique for solving this problem, a suspension arm bush structure disclosed in Japanese Utility Model Publication No. 1-44829 (Japanese Utility Model Publication No. 61-202730) is known. According to this publication, the bush 220 prevents the outer cylinder 211 from coming into contact with the suspension cross member 201 by interposing a resin bearing between the end of the outer cylinder 211 or the bush 220 and the suspension cross member 201. (The reference numerals are those used in FIGS. 15 and 16).
Japanese Utility Model Publication No. 1-444829 (Japanese Utility Model Publication No. 61-202730)

 However, in the technique disclosed in the above publication, when the lower arm 210 is assembled to the suspension cross member 201, the outer cylinder 211 must be inserted into the suspension cross member 201 while positioning the resin bearing with respect to the outer cylinder 211. Don't be. For this reason, there is a problem that the resin bearing is dropped during the assembling work and the working time is increased. In addition, there is also a problem that the resin bearing easily moves with respect to the outer cylinder 211 during assembly, which takes time.

 The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a vehicle suspension that is easy to assemble without causing the resin bearing to drop or move during assembly work. is there.

 In order to solve the above-described problem, a vehicle suspension according to the present invention includes an arm portion, an outer cylinder portion fixed to the arm portion, an inner cylinder fixed to a vehicle body and disposed inside the outer cylinder portion. A suspension for a vehicle including a cylinder and an elastic member interposed between the outer cylinder part and the inner cylinder, wherein the arm part is slidably coupled to the vehicle body, and the outer cylinder part A buffer body is interposed between at least one end of the vehicle body and the vehicle body, and the buffer body is provided with a connecting portion for connecting the buffer body to the outer tube portion or the arm. is there.

 According to the vehicle suspension of the present invention, it is possible to provide a vehicle suspension that can be easily assembled without causing the resin bearing to drop or move during assembly work.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an exploded perspective view of a connecting portion between a suspension cross member and a lower arm. 2 is a cross-sectional view taken along the line II-II in FIG. FIG. 3 is a perspective view of a resin bearing 40 that is a buffer. FIG. 4 is a perspective view showing a state in which the resin bearing 40 is connected to the lower arm 10.

 As shown in FIG. 1, the vehicle suspension of the present embodiment has a front bush 20 and a rear bush 12 that are elastic members made of rubber in the vicinity of the side end of the suspension cross member 1 extending in the vehicle width direction. And a lower arm 10 which is an arm portion rotatably connected to each other.

 An outer cylinder portion 11 is fixed to the lower arm 10 by welding. The front bush 20 is vulcanized and bonded to the outer peripheral surface of the inner cylinder 30. The front bush 20 is press-fitted into the outer cylinder portion 11 of the lower arm 10 and has flange portions 21 at both ends. The flange portion 21 is formed so as to protrude in the axial direction from the outer cylinder portion 11, and the outer diameter of the flange portion 21 is formed larger than the outer diameter of the outer cylinder portion 11. The inner cylinder 30 is fixed between two opposing sides of the suspension cross member 1 having a substantially U-shaped cross section by a bolt 2 penetrating the inner cylinder 30 and a nut 3 screwed into the bolt 2. . Thus, the lower arm 10 is slidably connected to the suspension cross member 1 that is the vehicle body via the front bush 20.

 In addition, a resin bearing 40 as a buffer is interposed between the front flange portion 21 of the front bush 20 and the suspension cross member 1. As shown in FIG. 3, the resin bearing 40 includes a washer portion 41 and a latching portion 44 that is a connecting portion.

 The washer portion 41 has a disc shape with a through-hole formed in the center, and has an outer diameter that is substantially the same as or slightly larger than the outer diameter of the outer cylinder portion 11. It is formed slightly larger than the outer diameter of the inner cylinder 30.

 A pair of latching portions 44 are formed at the outer peripheral portion of the disc-shaped washer portion 41 and at positions facing each other across the center of the disc. The latching portion 44 has the same thickness as the washer portion 41, and is formed at the tip of the tongue piece portion 42 and the tongue piece portion 42 formed so as to extend in a direction orthogonal to the surface of the washer portion 41. And a hook 43 that is bent so as to be folded outward in the radial direction. The two surface widths of the opposing surfaces of the tongue piece portions 42 of the pair of latching portions 44 have dimensions that are substantially the same as the outer diameter of the flange portion 21 of the front bush 20. The resin bearing 40 is a so-called thrust washer, and in this embodiment, a resin molded member made of a resin having self-lubricating property or a resin having oil-impregnating property is employed.

 As shown in FIG. 4, the resin bearing 40 is hooked on the hook 43 with the surface of the washer portion 41 facing the direction in which the tongue piece portion 42 extends is in contact with the end surface 21 a of the front bush 20. It is connected to the lower arm 10 by an annular elastic body 50 which is a tying member. The annular elastic body 50 that is a tying member is a member in which a rubber string having oil resistance and elasticity is formed in an annular shape. Since the annular elastic body 50 has oil resistance, it does not deteriorate or break due to the influence of oil or the like used when, for example, the front bush 20 is press-fitted into the outer cylinder portion 11.

 The annular elastic body 50 is wound around the lower arm 10 and the outer cylinder portion 11 in a state where tension is applied, and is hooked on the hook 43. For this reason, the resin bearing 40 is urged toward the end surface 21 a by the elastic force of the annular elastic body 50. Further, since the mutually facing surfaces of the pair of tongue pieces 42 formed on the resin bearing 40 come into contact with the outer peripheral surface of the flange portion 21, the resin bearing 40 is aligned with the front bush 20 to the lower arm 10. Connected.

 Next, a method for connecting the resin bearing 40 to the lower arm 10 by the annular elastic body 50 will be described below. First, the lower arm 10 is inserted into the annular elastic body 50. In this state, the resin bearing 40 is brought into contact with the end surface 21a, and one end of the annular elastic body 50 is hooked on the hook 43 on the lower arm 10 side. After that, the annular elastic body 50 is twisted while applying tension in the direction opposite to the end face 21a, so that the annular elastic body 50 is shaped like an eight. Out of the two loop-shaped parts formed by twisting the annular elastic body 50, the outer cylinder part 11 is inserted into the loop-shaped part not wound around the lower arm 10, and the loop-shaped part is further connected to the lower arm. 10 is hooked on the hook 43 on the opposite side. By the above operation, the annular elastic body 50 hooked on one hook 43 is wound around the lower arm 10 and the outer cylinder portion 11 and then hooked on the other hook 43, so that the resin bearing 40 Are coupled to the lower arm 10. The lower arm 10 is connected to the suspension cross member 1 after the resin bearing 40 is connected.

 As described above, the resin bearing 40 in which the hooking portion 44 is formed is connected to the lower arm 10 by the annular elastic body 50 hooked on the hook 43, so that it does not fall off from the lower arm 10. Moreover, since the resin bearing 40 is positioned with respect to the front bush 20 by the opposing surfaces of the pair of opposing tongue pieces 42, the positional relationship between the front bush 20 and the resin bearing 40 is not deviated.

 Therefore, according to the vehicle suspension of the present embodiment, it is necessary to insert the bolt 2 through the suspension cross member 1 while positioning the resin bearing 40 during the operation of connecting the lower arm 10 to the suspension cross member 1. Therefore, the effects of shortening the working time and improving the assembly reliability can be obtained.

 Further, since the resin bearing 40 can be connected to the lower arm 10 in advance, the number of work steps in the vehicle assembly line can be reduced.

 The method of connecting the resin bearing 40 to the lower arm 10 does not depend on the shape of the lower arm 10 and does not require a special tool for work. Therefore, the present invention also applies to a vehicle suspension for a vehicle that is already running. Is easy to apply. Further, if the outer diameters of the bushes or the outer cylinder portion coincide with each other, it is possible to share the same resin bearing in different vehicle types and different parts, and the present invention can be implemented at a lower cost.

 In addition, although the resin bearing 40 mentioned above uses the surface which a pair of tongue piece part 42 opposes as a means to position with respect to the front side bush 20, it is a washer part 61 like the resin bearing 60 shown in FIG. It is good also as a structure which positions by making the internal diameter of this substantially match | combine with the external shape of the inner cylinder 30, and fitting both.

 Further, if the tongue piece portion 72 is formed to expand in the circumferential direction of the washer portion 71 as in the resin bearing 70 shown in FIG. 6, the resin bearing 70 can be positioned more reliably and accurately with respect to the front bush 20. can do.

 As in the resin bearing 80 shown in FIG. 7, the extending direction of the tongue piece portion 82 from the proximal end of the hook 83 of the tongue piece portion 82 is defined on the tongue piece portion 82 formed wider in the circumferential direction than the hook 83. You may make it form the through-hole 84 which notched the other side.

 Further, when the resin bearing 40 is connected to the lower arm 10, the annular elastic body may be handled differently. For example, as shown in FIG. 8, after the annular elastic body 51 is hooked on one hook 43 of the resin bearing 40, the annular elastic body 51 is inserted into the annular elastic body 51 without inserting the outer cylinder portion 11 and the lower arm 10. The resin bearing 40 can be connected to the lower arm 10 even if 51 is wound around the outer cylinder portion 11 and the lower arm 10 and hooked on the other hook 43.

 The securing member for connecting the resin bearing to the lower arm 10 only has to have a predetermined tension so that the resin bearing can be brought into contact with the end surface of the front bush 20 or the outer cylinder portion 11. An example is shown in FIGS. 9 and 10. As shown in FIG. 9, a slit 94 that is a cut is formed in the hook 93 of the resin bearing 90. Moreover, the latching | locking part 53 whose outer diameter is larger than the opening width of the slit 94 is formed in the both ends of the tying member 52 which is a string-like elastic body. As shown in FIG. 10, the tying member 52 wound around the outer cylinder portion 11 and the lower arm 10 is inserted into the slit 94 of the resin bearing 90, and the hook portion 53 is hooked on the hook 93. The bearing 90 is connected to the lower arm 10.

 In the present embodiment, since the flange portion 21 of the front bush 20 protrudes in the axial direction from both ends of the outer cylinder portion 11, the resin bearing is interposed between the flange portion 21 and the suspension cross member 1. However, when the front bush 20 does not protrude from both ends of the outer cylinder part 11, the resin bearing is interposed between the outer cylinder part 11 and the suspension cross member 1.

 Moreover, in this embodiment, although the resin bearing 40 is arrange | positioned only in the vehicle front side of the front side bush 20, the position which arrange | positions the resin bearing 40 is not restricted to this position. The position where the resin bearing 40 is disposed is preferably set in a direction in which the lower arm and the bush are about to move by an external force applied to the suspension, and may be on one side with respect to the front bush 20 or on both sides. There may be. Further, in the present embodiment, the present invention is applied to the McPherson strut type front suspension, but the present invention can also be applied to a connecting portion of an arm constituting another type of suspension.

(Second Embodiment)
FIG. 11 shows a second embodiment of the present invention. In the following description, only differences from the first embodiment will be described. The same reference numerals are given to the same components as those in the first embodiment, and the description thereof will be omitted.

 As shown in FIG. 11, the resin bearing 80 of the present embodiment has the same shape as the resin bearing shown in FIG. 7, but the connection method to the lower arm 10 is different. In the present embodiment, in the annular elastic body 54, the pair of tongue pieces 82 and the outer cylinder portion 11 are inserted into the annular elastic body 54 with the resin bearing 80 in contact with the end surface 21 a. To be circulated.

 According to the present embodiment, it is not necessary to wind the annular elastic body 54 around the lower arm 10 as in the first embodiment, and it is possible to reduce the work time for connecting the resin bearing 80 to the lower arm 10. Become. Other effects are the same as those of the first embodiment.

(Third embodiment)
11 to 14 show a third embodiment of the present invention. In the following description, only differences from the first embodiment will be described. The same reference numerals are given to the same components as those in the first embodiment, and the description thereof will be omitted. FIG. 12 is a perspective view of the resin bearing 100. FIG. 13 is a perspective view of a state in which the resin bearing 100 is coupled to the lower arm 10. 14 is a cross-sectional view taken along the line XIV-XIV in FIG.

 As shown in FIG. 12, the resin bearing 100 of this embodiment includes a washer portion 101, a pair of tongue pieces 102 and 104, a hook 103 that is a connecting portion, and an engaging portion 105. The washer portion 101 has a disc shape with a through hole 107 formed in the center, and the outer diameter is substantially the same as or slightly larger than the outer diameter of the outer cylinder portion 11. . Further, the through hole 107 has an oval shape, and the width of the oval is formed to be slightly larger than the outer diameter of the inner cylinder 30.

 A pair of tongue piece portions 102 and a tongue piece portion 104 are formed in the outer peripheral portion of the disc-shaped washer portion 101 in both longitudinal directions of the through hole 107. The tongue piece portion 102 and the tongue piece portion 104 have the same thickness as the washer portion 101 and are formed to extend in the same direction perpendicular to the surface of the washer portion 101. A hook 103 is formed at the tip of the tongue piece 102 so as to be folded back outward in the radial direction of the washer 101. Further, an engaging portion 205 is formed at the tip of the tongue piece portion 104 and is bent at a right angle inward in the radial direction of the washer portion 101. In the present embodiment, the resin bearing 100 employs a resin molded member made of a resin having self-lubricating property or a resin having oil-impregnating property.

 As shown in FIGS. 13 and 14, the resin bearing 100 is hooked on the hook 103 in a state where the flange portion 21 of the front bush 20 is engaged between the engaging portion 105 and the washer portion 101. The annular elastic body 55 is connected to the lower arm 10. The resin bearing 100 is positioned with respect to the flange portion 21 when the opposing surfaces of the pair of tongue pieces 102 and 104 abut against the outer peripheral portion of the flange portion 21 of the front bush 20. At this time, since the through hole 107 has an oval shape, the inner cylinder 30 does not interfere with the washer portion 101 when the engaging portion 105 is engaged with the flange portion 21.

 According to the present embodiment, the annular elastic body 54 can be easily handled as compared with the first embodiment, and therefore the resin bearing 100 can be connected to the lower arm 10 in a shorter time. Other effects are the same as those of the first embodiment.

It is a disassembled perspective view of the connection part of the suspension cross member and lower arm by 1st Embodiment. It is II-II sectional drawing of FIG. It is a perspective view of a resin bearing. It is a perspective view which shows the state which connected the resin bearing to the lower arm. It is a perspective view which shows the modification of a resin bearing. It is a perspective view which shows the modification of a resin bearing. It is a perspective view which shows the modification of a resin bearing. It is a perspective view which shows the handling method of a cyclic | annular elastic body. It is a perspective view which shows the modification of a resin bearing. It is a perspective view which shows the state which connected the resin bearing of FIG. 9 to the lower arm. It is a perspective view which shows the state which connected the resin bearing by 2nd Embodiment to the lower arm. It is a perspective view of the resin bearing by 3rd Embodiment. It is a perspective view which shows the state which connected the resin bearing to the lower arm. It is XIV-XIV sectional drawing of FIG. It is a disassembled perspective view which shows the conventional vehicle suspension. It is XVI-XVI sectional drawing of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Lower arm, 11 Outer cylinder part, 21 Flange part, 21a End surface, 30 Inner cylinder, 40 Resin bearing, 43 Hook, 50 Annular elastic body

Claims (3)

An arm part, an outer cylinder part fixed to the arm part, an inner cylinder fixed to the vehicle body and disposed inside the outer cylinder part, and interposed between the outer cylinder part and the inner cylinder A suspension for a vehicle, wherein the arm portion is slidably coupled to the vehicle body,
A buffer is interposed between at least one end of the outer cylinder and the vehicle body,
A suspension for a vehicle, wherein a connection portion for connecting the buffer body to the outer cylinder portion or the arm is provided on the buffer body. The elastic member has a flange portion at least at one end;
The flange portion is formed to protrude from at least one end portion of the outer cylinder portion,
The said buffer body is connected to the said outer cylinder part or the said arm part by pinching | interposing the said flange part between the said buffer body and the at least one edge part of the said outer cylinder part. The vehicle suspension as described in 1. A hook for hooking a securing member on the connecting portion is provided,
3. The vehicle suspension according to claim 1, wherein the buffer body is temporarily fixed to the outer cylinder portion via the tying member that is hooked on the hook. 4.

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