JPS643861Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a rubber bushing used in automobiles, vehicles, etc.

[Prior Art] This type of rubber bushing generally includes an outer cylinder member 1, an inner cylinder member 2, a sleeve member 3, a large washer member 4, and a small washer member 5, as shown in FIG. The structure consists of In this rubber bushing, the sleeve member is displaced in response to loads such as compression, tension, shearing, twisting, and twisting between the outer cylinder member 1 and the inner cylinder member 2, thereby exerting a buffering effect. However, as shown in FIG. 1, this rubber bushing is in contact with the radial end surface 5a of the small washer member 5 and the end surface 3a of the sleeve member 3. When a force is applied from the direction of the arrow shown in FIG. 1, the sleeve member 3
It was thought that cracks would occur. As a result, conventional rubber bushings were at risk of having a shortened lifespan.

[Purpose of the invention] The present invention was created in view of the above circumstances. Therefore, an object of the present invention is to provide a rubber bushing that can suppress the occurrence of cracks and has a stable and long life.

[Summary of the invention] The rubber bushing of the invention has an outer cylinder member having a flange portion at one end, a flange portion at one end, and an outer cylinder member and an inner cylinder member such that the flange portion is in close contact with the flange portion of the outer cylinder member. A rubber sleeve member press-fitted between the cylinder member, a large washer member press-welded to the flange side end face of the sleeve member, and a small washer member press-welded to the other end face of the sleeve member. In a rubber bushing consisting of a washer member, the rubber sleeve member with the outer cylinder member removed has grooves extending in the circumferential direction on the other end and a portion on the other end side of the groove with an outer circumferential diameter outside. It has a small-diameter protrusion smaller than the inner diameter of the cylindrical member, and
The rubber sleeve member has a protrusion in the center whose outer diameter is larger than the inner diameter of the outer cylinder member, and the rubber sleeve member is press-fitted into the central hole whose shape is defined on the inner peripheral surface of the outer cylinder member. The sleeve member is pressed in the centripetal direction and is elastically deformed so as to be pushed out toward both ends, with a part of the small-diameter end protrusion protruding from the other end of the inner cylinder member in a direction parallel to the axis, and the protruding portion By pressing the small washer member against the other end of the rubber sleeve member, the rubber sleeve member is compressively deformed in the axial direction, and the outer end of the small washer member in the radial direction is prevented from contacting the rubber sleeve member. A portion of the sleeve member between the small washer member and the outer cylindrical member in a press-fitted state is formed as a recess.

[Structure of the invention] The outer cylinder member, which is a component of the invention, is a member having a flange portion at one end. This outer cylindrical member is usually formed from metal into a cylindrical shape.

The inner cylindrical member, which is a component of the present invention, has a smaller diameter than the outer cylindrical member and is provided inside the outer cylindrical member. This inner cylindrical member is usually formed from metal into a cylindrical shape. It is preferable that the end face of the inner cylinder member be knurled.

The rubber sleeve member, which is a component of the present invention, performs a buffering function as a rubber bush. This sleeve member has a flange portion at one end, and is press-fitted between the outer tube member and the inner tube member so that the flange portion comes into close contact with the flange portion of the outer tube member. The diameter of the sleeve member in its free state before being press-fitted is set to be larger than the inner diameter of the outer cylinder member, for example, by about 20 to 30%, which is the amount of restriction. The sleeve member in a free state before being press-fitted has a flange portion at one end, a protrusion portion at the center, and a small-diameter protrusion portion at the other end. It is preferable to form a groove between the protrusion and the flange. As the material constituting the sleeve member, commonly used materials can be used. For example, natural rubber or synthetic rubber can be used.

The large washer member that is a component of this invention is
It is in close contact with the end surface of the sleeve member on the flange side. Further, the small washer member is in close contact with the end surface on the other end side of the sleeve member. The large washer member and the small washer member are mainly used to tighten both axial ends of a rubber sleeve member by contracting them in the axial direction. Therefore, the large washer member and the small washer member are connected by the connecting means. In this case, commonly used coupling means can be used, such as a combination of bolts and nuts, welding, caulking, etc.

In the rubber bushing of the present invention, a portion of the sleeve member in a press-fitted state between the small washer member and the outer cylindrical member is recessed so that the outer end of the small washer member in the radial direction does not contact the sleeve member. It is formed as a section. This recess has an inclined surface whose diameter decreases toward the small washer member. This slope is preferably a concave surface, particularly a concave arc-shaped surface. The inclination angle of the slope is appropriately set in consideration of circumstances such as the diameter of the small washer member and the diameter of the sleeve member.

In forming the recess, the sleeve member in its free state before press-fitting has a flange formed at one end, a protrusion formed at the center, and a diameter formed at the other end, as described above. Further, a groove is formed adjacent to the small-diameter end protrusion and extending all the way around in the circumferential direction. If such grooves are formed, the above-mentioned depression will be formed when the sleeve member is press-fitted between the outer cylinder member and the inner cylinder member. The depth and width of this groove are appropriately set depending on the type of depression.

[Effect of the invention] In the rubber bushing of the invention, in order to prevent the radially outer end of the small washer member from coming into contact with the rubber sleeve member, the small washer member and the outer cylinder member of the sleeve member in a press-fitted state are The part between them is formed as a recess. Therefore, even if a large force is applied when using the rubber bushing, the end face of the small washer will not come into contact with the sleeve member. Therefore, it is possible to prevent cracks from occurring in the sleeve member due to the small washers. Therefore, the life of the rubber bushing can be extended.

[Example] Figures 2 and 3 show an embodiment of the present invention. Figure 2 is a cross-sectional view of the entire rubber bushing after press-fitting, and Figure 3 is a cross-sectional view of the rubber bush before press-fitting. It is a sectional view of a sleeve member.

In FIG. 3, the sleeve member 11 before press fitting is as follows:
A flange part 12 at one end, a protrusion part 13 at the center,
A groove 14 is provided between the protrusion 13 and the flange 12.
It has a small diameter end protrusion 15 at the other end. As shown in FIG. 5, this small diameter end protrusion 15 has an inclined surface 11d and a perpendicular surface 11c. Adjacent to this small diameter end protrusion 15, a groove 16 extending in the circumferential direction is formed around the entire circumference. Here, the angle θ of the surface 11e forming the groove 16 is about 45 degrees. An inner cylinder member 17 is vulcanized and bonded to the inner surface of the rubber sleeve member 11 before being press-fitted. Note that both ends of the inner cylinder member 17 slightly protrude from both end surfaces of the sleeve member 11 as shown in FIG.
It is said to be a.

Then, the sleeve member 11 integrally having the inner cylinder member 17 in this manner is press-fitted into the outer cylinder member 18. When press-fitting, the outer cylindrical member 18 is held in a jig and inserted into the outer cylindrical member 18 from the side of the small diameter end protrusion 15 formed on the sleeve member 11, as shown in FIG.

Immediately before press-fitting, the state is as shown in FIG. When pressed into the outer cylinder member 18, the sixth
The situation is as shown in the figure. FIG. 7 is a diagram showing a state in which a small washer member is attached. In the press-fitted state, the sleeve member 11 is pressed in the centripetal direction by the outer cylindrical member 18 and is elastically deformed so as to be pushed out in the direction of both ends, and is in a compressed state. The part is the inner cylinder member 17
A protruding portion 150 is formed to protrude from the other end in a direction parallel to the axis. Here the protruding part 1
A space portion is formed in the radially outward direction of 50. Therefore, the surface 11c moves in the direction of arrow A to correspond to the protruding end 17a, and the surface 11d moves in the direction of the arrow A, and the surface 11d moves in the direction of the arrow A to correspond to the protruding end 17a.
A surface 11e corresponding to 0 and forming the groove 16
and surface 11e are open.

When press-fitted, the outer peripheral surface of the sleeve member 11 is narrowed by 20 to 30% by the outer cylinder member 18. Adjustment of the aperture is mainly performed by the groove portion 14. As a result of the press-fitting, the outer cylinder member 18 is located outside the sleeve member 11, as shown in FIG. After press-fitting in this way, apply the large washer member 19 to the end surface of the sleeve member 11 on the flange portion 12 side, and then apply the large washer member 19 to the end surface of the sleeve member 11 on the other end side, that is, the protruding portion 1.
50, and the large washer member 19 and the small washer member 20 are fixed with bolts 25 and nuts 26. In this case, both ends of the sleeve member 11 in the axial direction are tightened by a large washer member 19 and a small washer member 20.

Here, the small washer member 20 functions to tighten the rubber sleeve member 11 in the axial direction as described above. Further, it is necessary that the small washer member 20 does not come into contact with the end surface 18a of the outer cylinder member 18 when a relative displacement is applied between the inner cylinder member 17 and the outer cylinder member 18 of the rubber bushing.

Therefore, the diameter of the small washer member 20 is the same as that of the outer cylinder member 1.
It is smaller than the inner diameter dimension of No. 8.

In the rubber bushing formed as described above, a recess 21 is formed between the small washer member 20 and the outer cylinder member 18. This depression 21 has a concave surface as shown in FIG. Therefore, the outer end 20a of the small washer member 20 in the radial direction is the end face 11a of the sleeve member 11.
Do not come into contact with. Therefore, even if a large force is applied in the direction of the arrow shown in FIG. 2, cracks as in the conventional case do not occur, or almost never occur. The load-deflection characteristics of the rubber bushing in this example are:
It has a characteristic of standing up when the depression 21 is completely filled.

Incidentally, FIG. 4 shows a sectional view of the sleeve member of the conventional rubber bushing shown in FIG. 1. Fourth
In the sleeve member shown in the figure, something corresponding to the groove 16 as in this example is not formed.

[Brief explanation of drawings]

1 and 4 show the prior art. FIG. 1 is a vertical cross-sectional view of the entire conventional rubber bushing, and FIG. 4 is a vertical cross-sectional view of a sleeve member having an inner cylindrical member before being press-fitted. 2 and 3 show an embodiment of the present invention, FIG. 2 is a longitudinal side view of the entire rubber bushing, and FIG. 3 is a longitudinal side view of the sleeve member having the inner cylinder member before being press-fitted. It is a diagram. FIG. 5 is an enlarged view of the main part of the embodiment before press-fitting, FIG. 6 is an enlarged view of the above-mentioned embodiment after press-fitting, and FIG. 7 is an enlarged view of the main part after press-fitting with a small washer member attached. In the figure, 11 is a sleeve member, 12 is a flange part,
13 is a protrusion, 14 is a groove, 15 is a small diameter end protrusion, 16 is a groove, 17 is an inner cylindrical member, 18 is an outer cylindrical member, 19 is a large washer member, 20 is a small washer member, 150 is a protruding portion shows.

Claims (1)

[Claims for Utility Model Registration] An outer cylinder member having a flange portion at one end, an inner cylinder member, and an outer cylinder member having a flange portion at one end, the flange portion being in close contact with the flange portion of the outer cylinder member. a rubber sleeve member press-fitted between the rubber sleeve member and the inner cylindrical member; a large washer member press-fitted to the flange side end surface of the rubber sleeve member; In a rubber bushing consisting of a small washer member pressed against an end face, the rubber sleeve member with the outer cylinder member removed has a groove extending in the circumferential direction on the other end side and a groove other than the groove. a small-diameter protrusion portion having an outer circumferential diameter smaller than the inner circumferential diameter of the outer cylindrical member at the end portion, and a protrusion portion having an outer circumferential diameter larger than the inner circumferential diameter of the outer cylindrical member at the center; When the rubber sleeve member is press-fitted into the central hole whose shape is defined on the inner peripheral surface of the outer cylinder member, the rubber sleeve member is elastically pressed in the centripetal direction and pushed out toward both ends. A part of the small-diameter end protrusion protrudes from the other end of the inner cylinder member in a direction parallel to the axis, and the small washer member is pressed against the other end of the rubber sleeve member. The small washer member of the rubber sleeve member is compressed and deformed in the axial direction by this, and the small washer member of the rubber sleeve member is compressed and deformed in the axial direction so that the outer end of the small washer member in the radial direction does not contact the rubber sleeve member. A rubber bushing characterized in that a portion between the outer cylindrical members is formed as a recessed portion.