JP5061080B2 - Anti-vibration bush - Google Patents

Description

  The present invention relates to an anti-vibration bush incorporated into, for example, a suspension device of an automobile.

  Conventionally, for example, in an automobile suspension device or the like, an anti-vibration bush has been used in a connection part between a vehicle body and a suspension component, specifically, a vehicle body attachment part of a lower arm that rotatably supports a wheel with respect to the vehicle body. ing. This anti-vibration bushing has a vibration-damping action and a buffering action for the vehicle body by coupling the lower arm and the vehicle body in an anti-vibration manner. The anti-vibration bush is generally composed of a core member (inner cylinder), a lower arm mounting cylinder part (outer cylinder) that is fitted outside the core member at a predetermined interval, and the core member and mounting cylinder. And a rubber-like elastic body that is interposed between the two portions and elastically couples them.

  In contrast to this type of anti-vibration bush, for example, Patent Document 1 discloses that the anti-vibration bush is provided with stoppers at both ends along the axial direction of the core member, and the axial movement of the mounting cylinder is restricted by the stopper. Is disclosed.

In the anti-vibration bush disclosed in Patent Document 1, a stopper flange that is integrally formed with the core member and protrudes radially outward is provided on one end side along the axial direction of the core member. A configuration is employed in which a disc-shaped stopper ring is press-fitted and fixed to the outer peripheral surface of the core member on the other end side along the axial direction.
JP 2003-294084 A

  However, in the anti-vibration bush disclosed in Patent Document 1, the mounting cylinder portion of the lower arm abuts against the press-fitted stopper ring by moving along the axial direction of the core member, and the axial direction relative to the stopper ring The power of is given. As a result, in the anti-vibration bush disclosed in Patent Document 1, the stopper ring may be pressed off in the axial direction and fall off.

  Moreover, in the vibration isolating bush disclosed in Patent Document 1, a step of press-fitting a stopper ring into the core member is required, and the work of assembling the vibration isolating bush becomes complicated.

  The present invention has been made in view of the above points, and provides an anti-vibration bushing that can suitably prevent the attachment cylinder portion from falling off the core member and can improve the assemblability. For the purpose.

In order to achieve the above object, the present invention provides an anti-vibration bush including a core member attached to a subframe of a vehicle, and an attachment cylinder portion externally fitted to the core member and connected to a lower arm. And a pair of retaining portions that restrict movement of the mounting cylinder portion in the axial direction, and at least one of the pair of retaining portions is provided on the subframe. The lower arm mounting portion of the subframe is provided with a first recess into which the mounting tube portion is inserted, and the inner wall itself of the first recess that engages with one end portion or both end portions along the axial direction of the mounting tube portion. a retaining part, and wherein the first recess, enters the portion of the mounting cylinder portion, wherein the outer side of the first recess, wherein Rukoto second recess is provided a bolt mounting portion of the core member enters And

  According to the present invention, among the pair of retaining portions for restricting the movement of the mounting cylinder portion in the axial direction, at least one retaining portion is provided in the subframe, so that the retaining tube portion is prevented from slipping when press-fitted. The axial force (pressing force) generated by the movement of the mounting cylinder in the axial direction is smaller than that of the conventional technique in which the stopper ring is press-fitted into the core member. Even when it acts on the retaining portion on the frame side, there is no fear of falling off the core member, and the retaining function of the mounting tube portion can be ensured. Moreover, in this invention, since it becomes unnecessary to provide the press-fit process like the prior art at the time of the assembly | attachment of a vibration proof bush, an assembly property can be improved.

  Furthermore, according to the present invention, the first recess is provided in the lower arm mounting portion of the subframe so that the mounting tube portion enters, and is engaged with one end portion or both end portions along the axial direction of the mounting tube portion. By using the inner wall itself as a retaining portion, the retaining function can be exerted with a simple structure, and the number of components can be reduced and the manufacturing cost can be reduced.

  Furthermore, according to the present invention, the first recess is provided so that a part of the mounting cylinder portion enters, and the second recess in which the bolt mounting portion of the core member enters is provided outside the first recess. Accordingly, the vibration-proof bushing itself can function as a reinforcing member for the subframe, which can contribute to ensuring the rigidity of the subframe.

Furthermore, according to the present invention, the retaining function can be improved by forming the second recess into a shape corresponding to the bolt mounting portion of the core member .

  According to the present invention, it is possible to obtain a vibration-proof bushing that can suitably prevent the attachment cylinder portion from falling off the core member and can improve the assembly workability.

  Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. 1 is a schematic perspective view of a subframe mechanism in which a vibration isolating bushing according to a first embodiment of the present invention is incorporated, FIG. 2 is a plan view of the subframe mechanism shown in FIG. 1, and FIG. FIG. 4A is a perspective view showing a state in which the vibration bush is attached to the subframe, FIG. 4A is a transverse sectional view of the vibration isolation bush along the line IVA-IVA in FIG. 3, and FIG. It is a cross-sectional view of the anti-vibration bush which concerns on the modification of ().

  As shown in FIGS. 1 and 2, the sub-frame mechanism 10 incorporating the vibration-proof bushing according to the first embodiment of the present invention includes a sub-frame 12 that supports an engine (not shown) and a wheel that rotates with respect to the vehicle body. It includes a lower arm 14 made of a suspension component that is movably supported and attached to the left and right sides of the subframe 12, and a vibration isolating bush 16 provided at an attachment site of the subframe 12 and the lower arm 14.

  The sub-frame 12 is coupled to a front cross member 18 that supports the front side of the vehicle (not shown) and extends in the vehicle width direction, and to both ends of the front cross member 18 along the axial direction. A pair of side members 20a, 20b extending substantially in parallel toward the rear of the vehicle from 18 and the ends of the pair of side members 20a, 20b are connected to support the rear side of the engine (not shown) and The rear member 22 extends along the direction.

  A first suspension attachment portion (lower arm attachment portion) 24a to which an intermediate portion of the lower arm 14 is attached and one end portion of the lower arm 14 are attached to the side portions of the pair of side members 20a and 20b positioned on the left and right sides of the subframe 12. The second suspension mounting portion 24b is provided. As shown in FIG. 3, the first suspension mounting portion 24a is formed by cutting out a ridge line portion where the upper surface and the side surface of the side members 20a and 20b (subframe 12) intersect, and the vibration isolating bush 16 enters. A recess 26 is provided. The second suspension mounting portion 24b is provided with a pin member 28 that pivotally supports one end portion of the lower arm 14 (see FIG. 2). In addition, the said recessed part 26 functions as a 1st recessed part in relation to the 2nd recessed part mentioned later.

  As shown in FIG. 3 and FIG. 4A, the anti-vibration bush 16 has flat bolt mounting portions 29 provided at both ends along the axial direction, and is formed in the bolt mounting portion 29. A core member 32 made of a metal shaft body attached to the sub-frame 12 (the upper surfaces of the side members 20a and 20b) via bolts 31 inserted into the bolt insertion holes 30 and a metal member connected to the lower arm body A cylindrical mounting body 34 that is coaxially fitted to the core member 32 and a sleeve that is interposed between the core member 32 and the mounting cylindrical section 34, and a vibration absorber such as rubber. The formed elastic body 36 is provided.

  On both end sides along the axial direction of the core member 32, a pair of retaining portions for restricting the movement of the mounting cylinder portion 34 in the axial direction is provided. The pair of retaining portions are positioned on one end side along the axial direction of the core member 32, and are provided with a stopper bracket 38 projecting upward from the bottom surface of the recess 26 of the subframe 12, and the axial direction of the core member 32. The stopper flange 40 is located on the other end side along the outer circumferential surface of the core member 32 and bulges outward in the radial direction and is integrally formed.

  In this case, the stopper bracket 38 is provided so as to engage with one end 34 a (hereinafter also referred to as an outer peripheral edge 34 a) along the axial direction of the mounting cylinder portion 34, and is provided in the recess 26 of the subframe 12. For example, it is integrally fixed by welding or the like.

  The stopper bracket 38 is formed of a substantially U-shaped flat plate, and has a U-shaped hole 42 through which the bolt mounting portion 29 of the core member 32 can be inserted in the vertical direction. Further, the stopper bracket 38 is an inner wall constituting the recess 26 and is located in the vicinity of one inner wall (vertical wall) along the axial direction of the core member 32, and along the radial direction of the mounting cylinder portion 34. The height dimension in the vertical direction and the width dimension in the horizontal direction are set so as to extend to the outer peripheral edge portion 34a. On the other hand, the stopper flange 40 is formed in a disk shape bulging radially outward from the outer peripheral surface of the core member 32.

  In the first embodiment, the stopper bracket 38 is configured separately from the subframe 12 and is configured to be integrally coupled to the subframe 12 using means such as welding. However, the present invention is not limited to this. For example, a part of the inner wall constituting the concave portion 26 of the subframe 12 may be cut down and used as the stopper bracket 38 as long as it is provided integrally with the subframe 12.

  As shown in FIG. 4B, a first stopper bracket 38a and a second stopper bracket 38b are provided in the recess 26 on the subframe 12 side, respectively, and are provided at both end sides along the axial direction of the core member 32. You may arrange | position so that it may oppose.

  In the first embodiment, since the stopper bracket 38 functioning as a retaining portion is provided in the recess 26 on the subframe 12 side, compared to the conventional technique in which the stopper ring is press-fitted into the core member 32, the mounting cylinder Even when an axial force (pressing force) generated by the movement of the portion 34 in the axial direction is applied to the stopper bracket 38, there is no fear of falling off the core member 32, and the attachment cylinder portion 34 is prevented from coming off. Function can be secured.

  Furthermore, in the first embodiment, the stopper bracket 38 which is at least one of the pair of retaining portions located at both ends of the core member 32 is provided in the recess 26 of the subframe 12 so as to be attached. When the cylindrical portion 34 is press-fitted, the retaining portion does not get in the way, and it is not necessary to provide a press-fitting step as in the prior art when assembling the vibration-isolating bushing 16, thereby improving the assemblability. Can do. In the first embodiment, a part of the mounting cylinder portion 34 constituting the vibration-proof bushing 16 is configured to enter the recess 26 (first recess).

  Next, an anti-vibration bush 16a according to a second embodiment of the present invention is shown in FIGS. 5 (a) and 5 (b). In the embodiment described below, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 5A is a longitudinal sectional view in which the vibration-proof bushing according to the second embodiment is attached to the subframe, and one inner wall itself of the concave portion is a retaining portion, and FIG. It is a longitudinal cross-sectional view which uses inner wall itself as a retaining part.

  In the anti-vibration bush 16a according to the second embodiment, the concave portion 26 (first concave portion) formed in the subframe 12 extends along the axial direction of the mounting cylinder portion 34 as shown in FIG. The inner wall 42a itself that engages with the one end 34a is formed as one retaining portion that restricts the movement of the mounting cylinder portion 34 in the axial direction (the other retaining portion is the stopper flange 40), or FIG. ), The pair of inner walls 42a and 42b which are respectively engaged with both end portions 34a and 34b along the axial direction of the mounting cylinder portion 34 and are spaced apart from each other by a predetermined distance are attached to the mounting cylinder portion 34. It is characterized in that it is formed as a pair of retaining portions for restricting movement in the axial direction.

  In other words, the stopper bracket 38 is not provided in the recess 26, and the inner walls 42a and 42b (vertical walls) themselves, which are substantially vertical surfaces constituting the recess 26, function as the retaining portions, thereby reducing the number of parts. In addition, the manufacturing process can be simplified and the cost can be reduced.

  Next, an anti-vibration bush 16b according to a third embodiment of the present invention is shown in FIGS. FIG. 6 is a perspective view showing a state in which the vibration-proof bushing according to the third embodiment is attached to the recess, FIG. 7A is a longitudinal sectional view taken along line VIIA-VIIA in FIG. 6, and FIG. FIG. 7A is a modification of FIG. 7A, and is a longitudinal sectional view in which the inner wall itself on one side of the first recess is a retaining portion. FIG. 8 is a modification of FIG. Is a perspective view corresponding to the shape of the bolt mounting portion of the vibration isolating bush.

  In the anti-vibration bush 16b according to the third embodiment, a first concave portion 26a into which a part of the mounting cylinder portion 34 connected to the lower arm 14 enters, and both sides of the core member 32 on the outer side (both sides) of the first concave portion 26a. It is characterized in that second recesses 26b into which the provided bolt mounting portions 29 enter are formed.

  That is, on the subframe 12 side, as shown in FIG. 7, a first recess 26 a into which a part of the mounting tube portion 34 (the arc portion on the lower side from the core member 32) enters is formed, and the first recess A second recess 26b is formed in a staircase shape extending to the outside of 26a and into which the bolt mounting portion 29 of the core member 32 enters, and a bolt 31 is screwed through a bolt insertion hole 30 formed in the bolt mounting portion 29. By doing so, the anti-vibration bush 16b itself can contribute to ensuring the rigidity of the sub-frame 12.

  In other words, a shaft-shaped core member 32 formed of a metal material is provided in parallel with the axis of the subframe 12 (side members 20a, 20b), and both ends of the core member 32 are fixed with the bolts 31. The anti-vibration bush 16b itself can function as a reinforcing member, and the rigidity of the subframe 12 can be improved.

  In this case, the second recess 26b may be formed corresponding to the shape of the bolt mounting portion 29 as shown in FIG. 8, or the width of the first recess 26a as shown in FIG. You may form in a rectangular shape corresponding to a dimension. Further, as shown in the modification of FIG. 7B, a stopper flange formed so as to bulge integrally with the core member 32 by causing the inner wall 42a itself on one side of the first recess 26a to function as one retaining portion. 40 may function as the other retaining portion.

  Next, an anti-vibration bush 16c according to a fourth embodiment of the present invention is shown in FIGS. Fig.9 (a) is a perspective view which shows the attachment state to the 1st recessed part and 2nd recessed part of the anti-vibration bush based on 4th Embodiment, FIG.9 (b) is the IXB-IXB line | wire of Fig.9 (a). FIG. 9C is a transverse sectional view taken along line IXC-IXC in FIG. 9A.

  In the anti-vibration bush 16c according to the fourth embodiment, the first recess 26a corresponding to the shape in which the mounting cylinder portion 34 and the bolt mounting portion 29 are combined when viewed from the side of the subframe 12 (side members 20a, 20b). The second concave portion 26b is formed, and the entire mounting cylinder portion 34 (all) is formed in the first concave portion 26a.

  That is, the depth of the first recess 26a and the second recess 26b is increased as compared with the first to third embodiments, and the second recess 26b is made to correspond to the shape of the bolt mounting portion 29 of the core member 32 and has a width. By forming it narrowly, the area of the inner walls 42a, 42b of the first recess 26a that functions as a retaining portion increases, so that the retaining function can be improved.

  In other words, in the second and third embodiments, when the inner walls 42a, 42b of the first recess 26a function as a retaining portion, a part of the outer peripheral edge 34a (the lower arc of the core member 32) Portion) abuts against the inner walls 42a, 42b of the first recess 26a and functions as a retaining portion, but in the fourth embodiment, substantially the entire outer peripheral edge 34a of the mounting cylinder 34 is formed of the first recess 26a. It can contact the inner walls 42a and 42b and function as a retaining portion. As a result, in the fourth embodiment, it is possible to increase the areas of the inner walls 42a and 42b that function as retaining portions in the first recess 26a, and to more reliably exhibit the retaining function.

  In the vibration isolating bush 16c according to the fourth embodiment, as shown in FIG. 9A, the bolt 31 is inserted along the second recess 26b and the bolt mounting portion 29 is fixed from the lateral direction. However, for example, by making a hole (not shown) on the upper surface of the subframe 12 (20a) and screwing the bolt 31 from above along the hole, the vibration isolating bush 16c can be easily attached. Assembling properties can be further improved.

It is a schematic perspective view of the sub-frame mechanism in which the anti-vibration bush which concerns on 1st Embodiment of this invention was integrated. It is a top view of the sub-frame mechanism shown by FIG. It is a perspective view which shows the state in which the said vibration proof bush is attached to a sub-frame. (A) is a cross-sectional view of the anti-vibration bush along the line IVA-IVA in FIG. 3, and (b) is a cross-sectional view of the anti-vibration bush according to the modification of (a). FIG. 5A is a longitudinal sectional view in which the vibration-proof bushing according to the second embodiment is attached to the subframe, and one inner wall itself of the recess is a retaining portion, and FIG. 5B is the inner walls of both the recesses. It is a longitudinal cross-sectional view which uses as a retaining part. It is a perspective view which shows the attachment state to the recessed part of the vibration isolating bush which concerns on 3rd Embodiment. (A) is a longitudinal sectional view taken along the line VIIA-VIIA in FIG. 6, and (b) is a modification of (a), in which the inner wall itself on one side of the first recess is a retaining portion. FIG. FIG. 7 is a modified example of FIG. 6 and is a perspective view in which the shape of the second recess is made to correspond to the shape of the bolt mounting portion of the vibration isolating bush. (A) is a perspective view which shows the attachment state to the 1st recessed part and 2nd recessed part of the anti-vibration bush which concerns on 4th Embodiment, (b) is a longitudinal cross-sectional view along the IXB-IXB line | wire of (a). (C) is a cross-sectional view along the IXC-IXC line of (a).

Explanation of symbols

12 Subframe 14 Lower arm 16, 16a to 16c Anti-vibration bush 24a Suspension mounting part (lower arm mounting part)
26 recess (first recess)
26a 1st recessed part 26b 2nd recessed part 29 Bolt attachment part 32 Core member 34 Attachment cylinder part 38, 38a, 38b Stopper bracket (detachment prevention part)
42a, 42b inner wall

Claims (2)

In a vibration-proof bushing having a core member attached to a sub-frame of a vehicle, and an attachment tube portion fitted on the core member and connected to a lower arm,
It is disposed on both ends along the axial direction of the core member, and includes a pair of retaining portions for restricting movement of the mounting cylinder portion in the axial direction,
At least one of the pair of retaining portions is provided in the subframe ,
The lower arm mounting portion of the subframe is provided with a first recess into which the mounting tube portion enters,
The inner wall itself of the first recess that engages with one end portion or both end portions along the axial direction of the mounting cylinder portion is used as a retaining portion.
A part of the mounting tube portion enters the first recess,
Wherein the outer side of the first recess, vibration damping rubber bushing according to claim Rukoto second recess is provided a bolt mounting portion of the core member enters. The anti-vibration bush according to claim 1,
It said second recess, vibration damping bush according to claim Rukoto such a shape corresponding to the bolt mounting portion of the core member.

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