JP2016223512A - Suspension Bush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suspension bush which is excellent in productivity although having a stopper in which a currant is formed at a rubber member, and which suppresses the excessive deformation of the rubber member to an axial direction.SOLUTION: A suspension bush 1 comprises a first currant 51, a second currant 52, a first stopper 61 and a second stopper 62. The first currant 51 is opened at one end of a rubber member 4 in an axial direction. The second currant 52 is opened at the other end of the rubber member 4 in the axial direction. The first stopper 61 is connected to the other end of an inner cylinder 2 in the axial direction, and covers a portion which is not overlapped on the opening part of the second currant 52 at the other end of the rubber member 4 in the axial direction. The second stopper 62 is connected to one end of the inner cylinder 2 in the axial direction, and covers a portion which is not overlapped on the opening part of the first currant 51 at one end of the rubber member 4 in the axial direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a suspension bush provided at a body side end of a suspension arm that connects a vehicle body and an axle.

  Vehicle suspensions include rigid axle suspensions, independent suspensions, and torsion beam suspensions. FIG. 3 is a schematic view of a rear torsion beam suspension.

  A suspension 100 in FIG. 3 includes a torsion beam 101 and a pair of trailing arms (suspension arms) 102 disposed at both ends thereof (see, for example, Patent Document 1). A coil spring 103, a shock absorber 104, and an axle 105 are attached to the vehicle rear side of the suspension arm 102. A cylindrical storage portion is formed on the vehicle front side of the suspension arm 102, and a suspension bush 200 is fitted into the storage portion. The suspension arm 102 is attached to the vehicle body (not shown) via the suspension bush 200.

  4 is a cross-sectional view taken along the line III-III in FIG. 3 and is a vertical cross-sectional view of a suspension bush 200 having a typical configuration. As shown in FIG. 4, the suspension bush 200 includes an inner cylinder 202, an outer cylinder 203, and a rubber member 204 interposed between both cylinders 202 and 203. A shaft portion 210 such as a bolt is passed through the inner cylinder 202, and the shaft portion 210 is fixed to a bracket 209 provided on a vehicle body (not shown). That is, the suspension bush 200 is fixed to the body via the bracket 209. On the other hand, the outer cylinder 203 is fixed to a cylindrical storage portion of the suspension arm 102 (see FIG. 3).

  The rubber member 204 interposed between both the cylinders 202 and 203 is formed with a pair of rims 205 and 205 that open to one end side (right side of the paper surface) of the rubber member 204. The curl 205 is a semi-cylindrical hole extending in a direction substantially parallel to the axial direction of the rubber member 4 (same as the axial direction of both the cylinders 202 and 203), and the rubber member 204 is deformed stepwise by the curl 205. It becomes composition. For example, when a load on the lower side of the paper acts on the outer cylinder 203, the rubber member 204 is easily deformed until the curl 205 on the upper side of the paper is crushed, and after the curl 205 is crushed, the rubber member 204 is deformed. It becomes difficult to do.

  Here, the rubber member 204 formed with the straight 205 is easily deformed in the axial direction. If the rubber member 204 is excessively deformed in the axial direction, the lateral force compliance increases, and the operability of the vehicle deteriorates. In order to solve such a problem, in the suspension bush 200 of FIG. 4, a stopper 206 that contacts the other end in the axial direction of the rubber member 204 (the left end of the paper surface) and one end in the axial direction of the rubber member 204 (the paper surface) A ring-shaped stopper 207 that is in contact with the right end) is fixed to the inner cylinder 202. The stopper 206 suppresses excessive deformation of the rubber member 204 toward the other end side in the axial direction, and the ring-shaped stopper 207 suppresses excessive deformation of the rubber member 204 toward the one end side in the axial direction.

JP 2000-335217 A

  The conventional suspension bush 200 shown in FIG. 4 has room for improvement in terms of productivity. In the suspension bush 200 in which the rubber member 204 is interposed between the inner cylinder 202 and the outer cylinder 203, the inner cylinder 202 and the outer cylinder 203 are usually arranged in the mold, and the raw rubber to be the rubber member 204 is placed in the mold. Obtained by insert molding. Here, as shown in FIG. 4, in order to form the curl 205 on the rubber member 204, it is necessary to insert a part of the mold into the gap between the inner cylinder 202 and the outer cylinder 203 from the right side of the drawing. However, when the ring-shaped stopper 207 is fixed to the inner cylinder 202 before the insert molding, a part of the mold for forming the straight 205 cannot be inserted into the gap between the inner cylinder 202 and the outer cylinder 203. That is, the ring-shaped stopper 207 on the opening side of the straight 205 is a member that cannot be disposed at the time of insert molding, and is a member that is retrofitted to the inner cylinder 202 after insert molding. Since the work of retrofitting the ring-shaped stopper 207 is complicated, the productivity of the suspension bush 200 is not good.

  The present invention has been made in view of the above circumstances, and one of its purposes is to provide a stopper that suppresses excessive deformation of the rubber member in the axial direction, with the curb being formed on the rubber member. Regardless, the object is to provide a suspension bushing with excellent productivity.

  A suspension bush according to one aspect of the present invention includes an inner cylinder, an outer cylinder, and a rubber member interposed between the two cylinders, and the body side of the suspension arm that connects the vehicle body side and the axle side. It is a suspension bush provided in the edge part. The suspension bush includes a first curl, a second curl, a first stopper, and a second stopper. The first curl opens at one end of the rubber member in the axial direction. The second curl opens at the other end of the rubber member in the axial direction. The first stopper is connected to the other end portion in the axial direction of the inner cylinder and covers a portion of the other end portion in the axial direction of the rubber member that does not overlap with the second straight opening, thereby Suppresses deformation in the direction. The second stopper is connected to one end of the inner cylinder in the axial direction, and covers a portion of the one end of the rubber member in the axial direction that does not overlap with the first straight opening, thereby moving the second stopper in the axial direction of the rubber member. Suppresses deformation.

  The suspension bush is excellent in productivity. This is because the two stoppers that suppress the deformation of the rubber member in the axial direction are provided so as to avoid the immediate opening. If the stopper is provided so as to avoid the position where it becomes a curly opening, the stopper becomes an obstacle when inserting a part of the mold that forms curl in the gap between the inner cylinder and the outer cylinder during insert molding. Don't be. That is, the structure of the suspension bush is a structure that can be insert-molded with both the first stopper and the second stopper attached to the inner cylinder. Therefore, the suspension bush does not have the trouble of retrofitting a member unlike the conventional suspension bush, and the suspension bush is excellent in productivity.

(A) is a front view of the suspension bush of embodiment, (B) is the BB cross section arrow directional view. It is a schematic explanatory drawing explaining an example of the production procedure of the suspension bush of embodiment. FIG. 3 is a schematic view of a torsion beam type rear suspension. It is a schematic longitudinal cross-sectional view (III-III cross-sectional arrow view) of the conventional suspension bush.

  Hereinafter, an example of an embodiment of a suspension bush according to the present invention will be described with reference to the drawings.

<Embodiment 1>
The suspension bushing of the embodiment is used, for example, for a connection portion between a torsion beam suspension described with reference to FIG. 3, a suspension arm provided in a rigid axle suspension, an independent suspension, and the vehicle body. The The suspension to which the suspension bush of the embodiment is applied may be a rear suspension or a front suspension.

≪Overall structure≫
As shown in FIGS. 1A and 1B, the suspension bush 1 according to the embodiment includes an inner cylinder 2, an outer cylinder 3, and a rubber member 4. The direction of the suspension bush 1 in the vehicle is not particularly limited. For example, the suspension bush 1 may be arranged so that the left side of the plane of FIG. 1B faces the inward side of the vehicle. The main difference between the suspension bush 1 and the conventional suspension bush 1 is that a pair of curls 51 and 52 formed on the rubber member 4 and a pair of stoppers 61 and 62 that suppress excessive deformation of the rubber member 4 in the axial direction are provided. Is provided in a form different from the conventional one. Hereinafter, each configuration of the suspension bush 1 will be described in detail.

≪Inner cylinder≫
The inner cylinder 2 is a member fixed to the vehicle body via a bracket (not shown) and the like, and is constituted by a rigid body such as metal. The inner cylinder 2 can be fixed to the bracket by a shaft such as a bolt as in the prior art described with reference to FIG. The inner cylinder 2 is provided with a first stopper 61 and a second stopper 62 described later.

≪Outer cylinder≫
The outer cylinder 3 is a member connected to the tip of a suspension arm (not shown), and is constituted by a rigid body such as metal. The outer cylinder 3 is bent so that the lower half of the paper surface of one end portion in the axial direction of the outer tube 3 (the left end portion in FIG. 1B) swells outward in the radial direction of the outer tube 3. A bent portion 3f is formed. The bent portion 3f is abutted against the housing portion when the suspension bush 1 is fitted into the cylindrical housing portion of the suspension arm, and the position of the suspension bush 1 relative to the suspension arm is determined by the abutment. The outer cylinder 3 is not directly connected to the inner cylinder 2 described above, but is indirectly connected to the inner cylinder 2 via a rubber member 4 described below.

≪Rubber material≫
The rubber member 4 is a member interposed between the inner cylinder 2 and the outer cylinder 3. The elastic modulus of the rubber member 4 can be selected as appropriate. The rubber member 4 is provided with a first curl 51 and a second curl 52.

≪First and second curiosity≫
As shown in FIG. 1A, the first curl 51 is a semicircular hole formed in the upper half region of the rubber member 4, and as shown in FIG. 1B, the rubber member 4 It is a hole extending in a direction parallel to the axial direction. The first curl 51 opens at one end of the rubber member 4 in the axial direction (the left end of the paper surface in FIG. 1B) (see the front side of the paper surface in FIG. 1A).

  On the other hand, the second curl 52 is a semicircular hole formed in the lower half region of the rubber member 4 as shown in FIG. 1 (A). As shown in FIG. It is a hole extending in a direction parallel to the axial direction of the member 4. The second curl 52 opens at the other end portion in the axial direction of the rubber member 4 (the right end portion on the paper surface of FIG. 1B) (see the back side of the paper surface in FIG. 1A).

  As shown in FIG. 1A, a first curl 51 and a second curl 52 are formed in an upper half region and a lower half region of the rubber member 4, respectively, and the conventional method described with reference to FIG. The suspension bush 200 has substantially the same effect as the straightening 205, 205. Here, the first curl 51 and the second curl 52 may have a symmetric shape or an asymmetric shape. For example, the circumferential length (arc length) of the first curl 51 and the depth of the hole may be shorter, longer or the same as that of the second curb 52.

≪First stopper ・ Second stopper≫
The first stopper 61 is connected to the other end portion in the axial direction of the inner cylinder 2 arranged on the right side in FIG. 1B (the back side in FIG. 1A). It is a member which covers the part which does not overlap with the opening part 52h of the second curl 52 in an edge part. The first stopper 61 of this example is formed in a substantially semicircular shape, and covers the upper half of the other end portion of the rubber member 4. The length in the radial direction of the first stopper 61 is smaller than the difference between the inner diameter of the outer cylinder 3 and the outer diameter of the inner cylinder 2, and the radial outer edge of the first stopper 61 is the inner peripheral surface of the outer cylinder 3. It is located radially inside. The first stopper 61 suppresses excessive deformation of the rubber member 4 toward the other end side in the axial direction.

  The second stopper 62 is connected to one end portion in the axial direction of the inner cylinder 2 arranged on the left side in FIG. 1B (the front side in FIG. 1A), and one end portion in the axial direction of the rubber member 4. It is a member which covers the part which does not overlap with the opening part 51h of the 1st straightening 51 in. The second stopper 62 of this example is formed in a substantially semicircular shape and covers the lower half of one end portion of the rubber member 4. The length of the second stopper 62 in the radial direction is larger than the difference between the inner diameter of the outer cylinder 3 and the outer diameter of the inner cylinder 2. By the second stopper 62, excessive deformation of the rubber member 4 toward one end side in the axial direction is suppressed.

≪Production procedure≫
An example of a procedure for producing the suspension bush 1 will be described with reference to FIG. First, the inner cylinder 2 provided with the first stopper 61 and the second stopper 62 is prepared, and the outer cylinder 3 is fitted from the first stopper 61 side of the inner cylinder 2. Next, the assembly of the inner cylinder 2 and the outer cylinder 3 is set inside a mold 9 formed by combining three divided molds 91, 92, 93 (the white arrows indicate the divided molds 91, 92, 93). Fitting direction). The split molds 91 and 92 are respectively formed with support portions 9A and 9B that are fitted into the inner cylinder 2, and the position of the inner cylinder 2 in the mold 9 is determined. In addition, the split molds 91 and 92 are inserted into the gaps between the inner cylinder 2 and the outer cylinder 3, respectively, and are formed to form a first curl 51 and a second curl 52 (see FIG. 1B). Portions 9C and 9D are formed. A part of the split mold 93 is inserted between the bent portion 3 f and the second stopper 62. Here, since the stoppers 61 and 62 are disposed at a position that avoids the bevel forming portions 9C and 9D, when inserting the bevel forming portions 9C and 9D into the gap between the inner cylinder 2 and the outer cylinder 3, the stopper 61, 62 does not interfere with the insertion.

  When the assembly of the inner cylinder 2 and the outer cylinder 3 is set in a mold, the inside of the mold 9 is filled with raw rubber. Then, after the raw rubber is cured, the molded product (suspension bush 1) is removed. When removing the mold, the split molds 91, 92, 93 may be removed in the direction opposite to the white arrow.

  As described above, according to the configuration of the suspension bush 1, the suspension bush 1 in which the stoppers 61 and 62 are already provided can be manufactured by insert molding, and work for retrofitting a member after insert molding does not occur. . Therefore, the suspension bush 1 is excellent in productivity even though it has the straights 51 and 52 that adjust the deformability of the rubber member 4 and the stoppers 61 and 62 that suppress excessive deformation of the rubber member 4. .

  The suspension bush of the present invention can be suitably used for a vehicle suspension.

DESCRIPTION OF SYMBOLS 1 Suspension bush 2 Inner cylinder 3 Outer cylinder 3f Bending part 4 Rubber member 51 First curl 52 Second curl 51h, 52h Opening 61 First stopper 62 Second stopper 9 Mold 91, 92, 93 Split mold 9A, 9B Support part 9C, 9D Curb forming part 100 Suspension 101 Torsion beam 102 Suspension arm 103 Coil spring 104 Shock absorber 105 Axle 200 Suspension bush 202 Inner cylinder 203 Outer cylinder 204 Rubber member 205 Straightening 206 Stopper 207 Ring-shaped stopper 209 Bracket 210 Shaft

Claims (1)

A suspension bush provided at an end of the body side of a suspension arm that includes an inner cylinder, an outer cylinder, and a rubber member interposed between both cylinders, and connects the vehicle body side and the axle side. ,
A first curb opening at one axial end of the rubber member;
A second curb opening at the other axial end of the rubber member;
The rubber member is deformed in the axial direction by covering the portion that is connected to the other end portion in the axial direction of the inner cylinder and does not overlap the opening portion of the second curl at the other end portion in the axial direction of the rubber member. A first stopper to suppress,
The axial deformation of the rubber member is suppressed by covering the portion that is connected to the axial end of the inner cylinder and does not overlap the opening of the first curl at the axial end of the rubber member. A second stopper,
Suspension bush with

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