JP6470087B2 - Manufacturing method of to collect bush - Google Patents

Description

  The present invention relates to a method for manufacturing a toe collect bush.

  Conventionally, for example, a toe collect bush as shown in Patent Document 1 below is known. The toe collect bush is provided so as to elastically connect the outer cylinder, an inner cylinder disposed inside the outer cylinder, and a cylindrical space between the outer cylinder and the inner cylinder. And a rubber member. An outer inclined wall extending gradually outward in the radial direction is projected from one end portion in the axial direction of the outer cylinder. At one end in the axial direction of the inner cylinder, an inner inclined wall extending in parallel to face the outer inclined wall is projected. The outer inclined wall and the inner inclined wall communicate with the cylindrical space, and the rubber member is provided so as to integrally fill the cylindrical space between the outer inclined wall and the inner inclined wall.

JP 2002-242971 A

  In the method of manufacturing the toe collect bush disclosed in Patent Document 1, when the unvulcanized rubber is injected in a state where the outer cylinder and the outer inclined wall, and the inner cylinder and the inner inclined wall are arranged in the cavity. The inner inclined wall may rotate in the circumferential direction of the inner cylinder with respect to the inner cylinder.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to easily regulate the rotational movement of the inner inclined wall.

In order to solve the above problems, the present invention proposes the following means.
The toe collect bush manufacturing method according to the present invention includes an outer cylinder, an inner cylinder disposed inside the outer cylinder, and a cylindrical space between the outer cylinder and the inner cylinder. And an outer inclined wall extending gradually outward in the radial direction as it goes outward in the axial direction at one end in the axial direction of the outer cylinder. In addition, an inner inclined wall that extends in parallel to face the outer inclined wall is protruded at one end portion in the axial direction of the inner cylinder, and the cylinder is between the outer inclined wall and the inner inclined wall. The rubber member is provided so as to integrally fill the cylindrical space between the outer inclined wall and the inner inclined wall, and the inner inclined wall extends from the axial direction of the inner cylinder. When viewed from the front, it is formed in a fan shape arranged coaxially with the inner cylinder, A manufacturing method for a toe collect bush, wherein a pair of side walls covering the inner cylinder from both outer sides in the radial direction are connected to both circumferential end portions of the inclined wall, wherein the outer cylinder and the outer inclined wall are disposed in a cavity. When injecting unvulcanized rubber with the wall, the inner cylinder, the inner inclined wall, and the pair of side walls disposed, the pair of side walls are separately pressed from the radially outer side of the inner cylinder. It is characterized by being fixed.

  In this case, when the unvulcanized rubber is injected in a state where the outer cylinder and the outer inclined wall, the inner cylinder, the inner inclined wall and the pair of side walls are disposed in the cavity, the pair of side walls are formed with the diameter of the inner cylinder. Press and fix each direction from the outside. Thereby, it becomes possible to regulate that the inner inclined wall rotates in the circumferential direction of the inner cylinder via the pair of side walls, and the rotational movement of the inner inclined wall can be easily restricted.

  According to the present invention, the rotational movement of the inner inclined wall can be easily regulated.

It is a perspective view of the vibration isolator which concerns on one Embodiment of this invention. It is a side view of the vibration isolator shown in FIG. It is the top view which looked at the vibration isolator shown in FIG. 1 from the one side of the axial direction. It is the top view which looked at the vibration isolator shown in FIG. 1 from the other side of the axial direction. FIG. 5 is a cross-sectional view taken along the line VV shown in FIGS. 3 and 4. It is the top view which looked at the inner cylinder, inner side inclination wall, bottom wall, and side wall which comprise the vibration isolator shown in FIG. 1 from the one side of the axial direction. It is sectional drawing of the vibration isolator which concerns on the comparative example of this invention, Comprising: It is a figure corresponded to the VV sectional arrow view shown to FIG. 3 and FIG.

Hereinafter, an embodiment of a vibration isolator according to the present invention will be described with reference to FIGS. 1 to 6.
As shown in FIGS. 1 to 5, the toe collect bush 10 includes an outer cylinder 11, an inner cylinder 12 disposed inside the outer cylinder 11, and a cylinder between the outer cylinder 11 and the inner cylinder 12. And a rubber member 13 provided to elastically connect the both 11 and 12 to the space 10a. Note that the central axes of the outer cylinder 11 and the inner cylinder 12 are arranged on a common axis. Hereinafter, this common axis is referred to as a central axis O, and a direction along the central axis O is referred to as an axial direction (an axial direction of an outer cylinder, an axial direction of an inner cylinder). In a plan view of the toe collect bush 10 viewed from the axial direction, the direction orthogonal to the central axis O is referred to as the radial direction (the radial direction of the outer cylinder, the radial direction of the inner cylinder), and the direction around the central axis O is the circumferential direction. The direction (the circumferential direction of the outer cylinder, the circumferential direction of the inner cylinder).

  As shown in FIG. 5, an outer inclined wall 14 that gradually extends outward in the radial direction is projected from one end portion in the axial direction of the outer cylinder 11 toward the outer side in the axial direction. At one end in the axial direction, an inner inclined wall 15 extending in parallel to face the outer inclined wall 14 is projected. The space between the outer inclined wall 14 and the inner inclined wall 15 communicates with the cylindrical space 10a. The inner inclined wall 15 is formed with a rubber circulation hole 15 a that penetrates the inner inclined wall 15. The rubber circulation hole 15 a communicates between the outer inclined wall 14 and the inner inclined wall 15 and between the inner cylinder 12 and the inner inclined wall 15.

  Here, in the present embodiment, both end portions in the axial direction of the inner cylinder 12 protrude outward from both ends in the axial direction of the outer cylinder 11, and the inner inclined wall 15 is the outer peripheral surface of the inner cylinder 12. The outer cylinder 11 is provided so as to project from a portion protruding in the axial direction from one end 11 a in the axial direction. Hereinafter, the one end 11a side in the axial direction of the outer cylinder 11 along the axial direction is referred to as one axial side, and the opposite side of the one end 11a across the outer cylinder 11 is referred to as the other axial side.

  Further, in the present embodiment, the outer inclined wall 14 and the inner inclined wall 15 are provided only in a part along the circumferential direction, and are not provided over the entire circumference. As shown in FIG. 6, the inner inclined wall 15 is formed in a sector shape arranged coaxially with the inner cylinder 12 in a front view seen from the axial direction, and a reference line L passing on the central axis O is defined. The line is symmetrical with respect to the reference. Hereinafter, the circumferential position at which the outer inclined wall 14 and the inner inclined wall 15 are arranged is referred to as a to-collect position, and the to-collect position side is defined as the to-collect side with respect to the central axis O along the reference line L direction. The opposite side of the to-collect side with respect to the central axis O is called the anti-to-collect side.

As shown in FIGS. 5 and 6, one end, which is one end of the inner inclined wall 15, is bent toward the anti-torque side and extends parallel to the axial direction.
A bottom wall 21 connected to the inner inclined wall 15 is provided at the other end which is the other end of the inner inclined wall 15. The bottom wall 21 is formed in a flat plate shape extending from the inner inclined wall 15 toward the anti-torque side, and the front and back surfaces of the bottom wall 21 are orthogonal to the central axis O. The bottom wall 21 is provided with an insertion hole 22 that opens toward the anti-torque side. The inner cylinder 12 is inserted into the insertion hole 22 from the anti-torque side.

  As shown in FIG. 6, a pair of side walls 23 that cover the inner cylinder 12 from both outer sides in the radial direction are connected to both peripheral ends of the inner inclined wall 15. The pair of side walls 23 extend along the axial direction, and one end portion which is one end portion in the axial direction of the side wall 23 is formed flush with one end portion of the inner inclined wall 15. The other end which is the other end in the direction is connected to the bottom wall 21.

  The pair of side walls 23 extend separately from both peripheral ends of the inner inclined wall 15 toward the anti-torque side. Each of the pair of side walls 23 is gradually inclined toward the anti-torque side in the front view seen from the axial direction, and from the inclined part 24 approaching the reference line L, and the end part of the inclined part 24 on the anti-torque side, And a main body 25 extending along the reference line L direction. Of the pair of side walls 23, the main body portions 25 face each other in the radial direction with the inner cylinder 12 interposed therebetween.

  As shown in FIG. 5, the rubber member 13 is provided so as to integrally fill the space between the outer inclined walls 14 and the inner inclined walls 15 and the cylindrical space 10a. Thereby, the rubber member 13 elastically connects not only the outer cylinder 11 and the inner cylinder 12 but also the outer inclined wall 14 and the inner inclined wall 15. Further, the rubber member 13 is disposed between the front and back surfaces of the inner inclined wall 15 and the back surface opposite to the surface facing the outer inclined wall 14 and the outer peripheral surface of the inner cylinder 12. Thereby, the entire inner inclined wall 15 is embedded in the rubber member 13. In addition, the rubber member 13 is not covered at both ends in the axial direction of the inner cylinder 12 and is exposed to the outside.

  Here, as shown in FIGS. 4 and 5, the other end surface 13 a facing the other side of the rubber member 13 in the cylindrical space 10 a has tick portions 16 a to 16 d recessed inward in the axial direction in the circumferential direction. A plurality are formed with a gap. In the illustrated example, the plurality of straight portions 16a to 16d are positioned 90 ° in the circumferential direction so that one of them 16a is disposed at the to collect position on the other end surface 13a of the rubber member 13. A total of four are formed by shifting.

  Among these straight portions 16a to 16d, the to-collect side straight portion 16a located on the to-collect side with respect to the central axis O and disposed at the to-collect position, and the anti-to-collect with respect to the central axis O A slit 16e extending along the axial direction is formed in each of the anti-torque side straight portions 16b located on the side. Among these slits 16e, the slit 16e formed in the anti-torque side straight part 16b is formed over the entire length in the axial direction, while the slit 16e formed in the toe collect side straight part 16a is formed on the rubber member 13. The other end surface 13a extends to the bottom wall 21.

  Further, as shown in FIGS. 3 and 4, among the straight portions 16 a to 16 d, the straight portions 16 c and 16 d (hereinafter, “side straight portions”) other than the to-collect side straight portion 16 a and the anti-torque-side straight portion 16 b. Is provided with an axial through-hole 17. The through-holes 17 are provided separately in the side straight portions 16c and 16d, and a pair of through-holes 17 are provided with the inner cylinder 12 and the pair of side walls 23 sandwiched in the radial direction. As shown in FIG. 2, the through-hole 17 is connected to a groove 18 formed in a portion of the rubber member 13 that protrudes from the outer cylinder 11 to one side. The concave groove 18 extends linearly in the axial direction from the through hole 17 toward one side.

  The toe collect bush 10 configured as described above is, for example, a torsion beam suspension mechanism in which a pair of trailing arms that support wheels on both sides in the vehicle left-right direction are coupled and fixed to each other by a torsion beam extending in the vehicle left-right direction. Used. At this time, the outer cylinder 11 is fitted into a mounting hole formed in the pair of trailing arms and extending in the left-right direction of the vehicle, while the inner cylinder 12 is fixed and assembled to the vehicle body. This to-collect bush 10 has an outer inclined wall 14 and an inner inclined wall 15 positioned on the vehicle longitudinal axis in a three-dimensional orthogonal coordinate system comprising a vehicle lateral axis, a vehicle longitudinal axis, and a vehicle vertical axis. In addition, the assembly is performed such that the central axis O is positioned on the vehicle lateral axis.

  Deformation of the rubber member 13 interposed between the outer inclined wall 14 and the inner inclined wall 15 when the vehicle having such a torsion beam suspension mechanism receives an input in the vehicle left-right direction such as a cornering force, for example. Thus, by moving the inner cylinder 12 in the vehicle front-rear direction, the movement of the tire can be controlled to improve the steering stability and the ride comfort.

  Next, a method for manufacturing the toe collect bush 10 will be described.

In the present embodiment, the outer cylinder 11 and the outer inclined wall 14, the inner cylinder 12, the inner inclined wall 15, the bottom wall 21, and the pair of side walls 23 are placed in a cavity of a mold formed by combining a plurality of split molds. The toe collect bush 10 is formed by injecting unvulcanized rubber in the arranged state.
At this time, as shown by a two-dot chain line in FIG. 6, the pair of side walls 23 are pressed and fixed separately from the radially outer side of the inner cylinder 12. In the illustrated example, a pair of pressing pins P that form the through hole 17 and the recessed groove portion 18 of the rubber member 13 are inserted into the outer cylinder 11 separately from the other side in the axial direction. Each of the body portions 25 of the side wall 23 is pressed inward in the radial direction. The pair of pressing pins P can sandwich the inner cylinder 12 via the pair of side walls 23 in the radial direction.

In a state where the pair of side walls 23 are pressed and fixed separately from the outside in the radial direction of the inner cylinder 12, unvulcanized rubber is injected into the cavity, and the unvulcanized rubber is vulcanized. Thereby, the to-collect bush 10 is formed in the cavity.
Thereafter, the mold is removed from the toe collect bush 10 and the toe collect bush 10 is taken out from the cavity. At this time, the pressing pin P is pulled out from the outer cylinder 11 toward the other side in the axial direction.

  As described above, according to the manufacturing method of the toe collect bush 10 according to the present embodiment, the outer cylinder 11 and the outer inclined wall 14, the inner cylinder 12, the inner inclined wall 15, the bottom wall 21, and the pair in the cavity. When the unvulcanized rubber is injected, the pair of side walls 23 are pressed and fixed separately from the outside in the radial direction of the inner cylinder 12. Thereby, it becomes possible to regulate that the inner inclined wall 15 rotates in the circumferential direction of the inner cylinder 12 via the pair of side walls 23, and the rotational movement of the inner inclined wall 15 can be easily restricted. it can.

Here, instead of pressing and fixing the pair of side walls 23 from the outside in the radial direction of the inner cylinder 12, a positioning hole 103 that penetrates the bottom wall 21 in the axial direction is provided in the bottom wall 21. At the same time, it is conceivable to restrict the rotational movement of the inner inclined wall 15 through the bottom wall 21 by providing a positioning pin extending in the axial direction in the cavity and inserting the positioning pin into the positioning hole 103.
However, in this case, like the toe collect bush 100 shown in FIG. 7, a stress concentration portion is formed in the rubber member 13 due to the concave portion 101 formed by the positioning pin in the rubber member 13, and the rubber member 13 is easily cracked. In this configuration, the recess 101 is formed so as to extend from a part of the bottom surface of the slit 16e arranged at the to-collect position to one side in the axial direction, and the stepped shape 102 is formed on the bottom surface of the slit 16e. As a result, a stress concentration portion is formed in the rubber member 13.
Further, in this case, from the viewpoint of the spring characteristics of the rubber member 13, the positioning pin needs to be formed thin, so that the positioning pin is easily damaged.

  The technical scope of the present invention is not limited to the above-described embodiment, and various modifications are made without departing from the spirit of the present invention. For example, the constituent elements in the above-described embodiment are replaced with known constituent elements. It is possible to appropriately do this.

10 Toe collect bush 10a Cylindrical space 11 Outer cylinder 12 Inner cylinder 13 Rubber member 14 Outer inclined wall 15 Inner inclined wall 23 Side wall

Claims (1)

An outer cylinder, an inner cylinder disposed inside the outer cylinder, and a rubber member provided to elastically connect the two to a cylindrical space between the outer cylinder and the inner cylinder. And
An outer inclined wall extending toward the radially outer side gradually protrudes toward one end portion in the axial direction of the outer cylinder, and toward one end portion in the axial direction of the inner cylinder. An inner inclined wall extending in parallel to face the outer inclined wall is protruded, and the space between the outer inclined wall and the inner inclined wall communicates with the cylindrical space,
The rubber member is provided so as to integrally fill the cylindrical space between the outer inclined wall and the inner inclined wall,
The inner inclined wall is formed in a sector shape arranged coaxially with the inner cylinder in a front view as viewed from the axial direction of the inner cylinder,
A method for producing a toe collect bush, wherein a pair of side walls covering the inner cylinder from both outer sides in the radial direction are connected to both peripheral ends of the inner inclined wall,
In the state where the outer cylinder and the outer inclined wall, the inner cylinder, the inner inclined wall and the pair of side walls are disposed in the cavity, the unvulcanized rubber is injected, and the pair of side walls are A method for manufacturing a toe collect bush, wherein the inner cylinder is pressed and fixed separately from the radially outer side of the inner cylinder.

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