Body mount

Abstract

To provide a body mount in which an outer cylinder member is made of a resin, and which is capable of suppressing a decrease in coming-off force from a holder while maintaining a coming-off force of an elastic body.SOLUTION: In the body mount 1 including a resin-made outer cylinder member 2, an inner cylinder member 3 disposed in a hollow portion of the outer cylinder member 2, and an elastic body 4 interposed between the outer cylinder member 2 and the inner cylinder member 3, the outer cylinder member 2 being press-fitted and fixed to an 10a of an insertion hole of a holder 10, the outer cylinder member 2 has a protrusion 5 protruding radially inward from an 2c of an inner peripheral surface, and the protrusion 5 has a hollow structure in which a through-hole 6 extending in an axial direction of the outer cylinder member 2 is formed.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present invention relates to a body mount. [Background technology]

[0002] Body mounts are used as vibration-damping devices for vehicle suspension mechanisms, etc., and are constructed by placing an elastic material between an inner cylindrical member and an outer cylindrical member. In use, the outer cylindrical member is press-fitted into an insertion hole in a holder on the suspension member side, and the inner cylindrical member is inserted onto a bolt on the body side and tightened with a nut.

[0003] For such body mounts, various proposals have been made in which the outer tubular member is made of resin for the purposes of weight reduction, rust prevention, etc. For example, Patent Document 1 discloses a technology in which a radially recessed recess is formed on the outer peripheral surface of a resin outer tubular member, and a protrusion that makes the wall thickness uniform is formed on the inner peripheral surface of the outer tubular member, thereby increasing the removal force of the elastic body. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-62977 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the body mount described in Patent Document 1, a recess is formed on the outer peripheral surface of the outer tube member, which means that when the body mount is pressed into the insertion hole of the holder, the contact area between the outer tube member and the holder is reduced by the amount of the recess, resulting in a problem of reduced force for removal from the holder.

[0006] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a body mount that has an outer cylindrical member made of resin and that is capable of suppressing a decrease in the force required for removal from the holder. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the present invention provides a body mount comprising an outer tube member made of resin, an inner tube member arranged in a hollow portion of the outer tube member, and an elastic body interposed between the outer tube member and the inner tube member, wherein the outer tube member is press-fitted and fixed into an insertion hole of a holder, wherein the outer tube member has a protrusion protruding radially inward from its inner surface, and the protrusion has a hollow structure with a through hole formed therein extending in the axial direction of the outer tube member. [Effects of the Invention]

[0008] According to the present invention, the outer tube member is made of resin, and the removal force of the elastic body is maintained while suppressing a decrease in the removal force from the holder. Other problems, configurations, and effects will become clear from the description of the following embodiments. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 2 is a perspective view of a body mount according to the embodiment. [Figure 2] FIG. 2 is a perspective view of the body mount of FIG. 1 as seen from upside down. [Figure 3] FIG. [Figure 4] FIG. 2 is a vertical cross-sectional view of the body mount. [Figure 5] FIG. 1 is a cross-sectional view of a body mount. [Figure 6] FIG. 2 is a perspective view of an outer cylinder member provided on the body mount. [Figure 7] FIG. 2 is a longitudinal cross-sectional view of an outer cylindrical member. [Figure 8] FIG. 2 is a cross-sectional view of the outer cylindrical member. [Figure 9] FIG. 10 is a cross-sectional view showing a state in which the body mount is assembled into the insertion hole of the holder. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0011] FIG. 1 is a perspective view of a body mount according to an embodiment, FIG. 2 is a perspective view of the body mount of FIG. 1 viewed from an upside-down direction, FIG. 3 is a front view of the body mount, FIG. 4 is a vertical cross-sectional view of the body mount, and FIG. 5 is a horizontal cross-sectional view of the body mount.

[0012] As shown in Figures 1 to 5, the body mount 1 of the embodiment is configured to include an outer tube member 2, an inner tube member 3 arranged within the hollow portion of the outer tube member 2, and a rubber elastic body 4 interposed between the outer tube member 2 and the inner tube member 3 to connect them together.

[0013] The inner cylinder member 3 is a cylindrical member made of metal and is disposed in the center of the body mount 1. The inner cylinder member 3 has a hollow hole 3a that penetrates along the axial direction, and is fixed to the vehicle body side such as a frame via a bolt that is inserted into the hollow hole 3a. Both vertical ends of the inner cylinder member 3 protrude from both vertical ends of the outer cylinder member 2.

[0014] The outer cylindrical member 2 is a cylindrical member made of resin, and is arranged radially outwardly of and spaced apart from the inner cylindrical member 3. An outer peripheral surface 2a of the outer cylindrical member 2 is a portion that is press-fitted into an insertion hole of a holder (described later) on the suspension member side.

[0015] 6 is a perspective view of the outer cylindrical member 2, FIG. 7 is a vertical cross-sectional view of the outer cylindrical member 2, and FIG. 8 is a horizontal cross-sectional view of the outer cylindrical member 2. As shown in FIG.

[0016] The outer tube member 2 is a resin molded product formed by injection molding. As shown in FIGS. 6 to 8, the outer tube member 2 has an outer peripheral surface 2a with a constant diameter from the upper end to the lower end in the axial direction. In other words, the outer peripheral surface 2a of the outer tube member 2 is a press-fit portion without any recesses. A flange portion 2b having a larger diameter than the outer peripheral surface 2a is integrally formed at one end of the outer tube member 2. The flange portion 2b is formed at the end opposite to the press-fitting direction when the outer tube member 2 is press-fitted into the insertion hole of the holder, and functions as a stopper that determines the press-fit position of the outer tube member 2.

[0017] Protrusions 5 that protrude radially inward are integrally formed at two locations on the inner peripheral surface 2c of the outer cylindrical member 2. These protrusions 5 have the function of controlling the rubber properties and durability of the rubber elastic body 4, and have a hollow structure with through-holes 6 that extend in the axial direction of the outer cylindrical member 2. The two protrusions 5 are formed inside the outer cylindrical member 2, away from both axial ends thereof, and are positioned 180 degrees apart across the inner cylindrical member 3.

[0018] The protrusion 5 has an arc-shaped portion 5a that faces the inner circumferential surface 2c of the outer tube member 2 via the through hole 6, and a pair of connecting portions 5b that support both ends of the arc-shaped portion 5a and connect to the inner circumferential surface 2c. The outer tube member 2 has a substantially uniform wall thickness, including the arc-shaped portions 5a and the connecting portions 5b, so sink marks are unlikely to occur on the outer circumferential surface 2a even when the protrusion 5 is formed on the inner circumferential surface 2c of the outer tube member 2. Furthermore, the through hole 6 is formed such that the outer circumferential dimension in contact with the inner circumferential surface 2c is longer than the inner circumferential dimension in contact with the arc-shaped portion 5a. That is, as shown in FIG. 8 , the protrusion 5 is formed in a substantially trapezoidal shape in a plan view, making it resistant to deformation due to external pressure.

[0019] The rubber elastic body 4 is interposed between the outer tube member 2 and the inner tube member 3, and elastically connects the outer tube member 2 and the inner tube member 3. The rubber elastic body 4 is vulcanized and bonded to the inner circumferential surface 2c of the outer tube member 2 and the outer circumferential surface of the inner tube member 3 by injecting molten rubber between the outer tube member 2 and the inner tube member 3 and cooling it. At this time, the injected molten rubber is also supplied into the through holes 6 of the protrusions 5, so that the rubber elastic body 4 is interposed between the outer tube member 2 and the inner tube member 3 so as to enclose the protrusions 5. This increases the removal force of the rubber elastic body 4, making it difficult to remove from the outer tube member 2. Furthermore, because a pair of protrusions 5 facing each other across the inner tube member 3 is present inside the rubber elastic body 4, the spring force of the rubber elastic body 4 in the direction in which these protrusions 5 face each other is increased.

[0020] FIG. 9 is a cross-sectional view showing the state in which the body mount 1 is assembled into the insertion hole 10a of the holder 10 on the suspension member side.

[0021] When assembling the body mount 1 to the holder 10, as shown in Fig. 9, the end of the outer tubular member 2 opposite the flange portion 2b is inserted into the insertion hole 10a, and then the outer tubular member 2 is pressed toward the inside of the insertion hole 10a (downward in Fig. 9) until the flange portion 2b abuts the end face of the holder 10. This causes the outer peripheral surface 2a of the outer tubular member 2 to be press-fitted into the inner peripheral surface of the insertion hole 10a, generating a force that presses the outer tubular member 2 radially inward, and the body mount 1 is fixed to the holder 10. At this time, the entire outer peripheral surface 2a, which has no recesses, is in close contact with the inner peripheral surface of the insertion hole 10a, ensuring a sufficient contact area between the outer peripheral surface 2a and the insertion hole 10a and maintaining a high force for removal from the holder 10.

[0022] As described above, the body mount 1 according to this embodiment can provide the following advantageous effects.

[0023] The body mount 1 according to this embodiment is configured by interposing a rubber elastic body 4 between an inner cylindrical member 3 and a resin outer cylindrical member 2. The outer cylindrical member 2 has a protrusion 5 that protrudes radially inward from the inner peripheral surface 2c, and this protrusion 5 has a through hole 6 that extends in the axial direction of the outer cylindrical member 2. As a result, the rubber elastic body 4 surrounding the protrusion 5 enters the through hole 6, increasing the removal force of the rubber elastic body 4 and making it more difficult to remove from the outer cylindrical member 2, while also increasing the spring force of the rubber elastic body 4 in the direction facing the protrusion 5. Furthermore, there is no need to provide a recess on the outer peripheral surface 2a of the outer cylindrical member 2, and the outer peripheral surface 2a without a recess can be closely fitted over a wide area to the insertion hole 10a of the holder 10, thereby preventing a decrease in the removal force from the holder 10.

[0024] Furthermore, in this embodiment, a pair of protrusions 5 are provided at positions that are 180 degrees apart across the inner tube member 3. Therefore, for example, by assembling the pair of protrusions 5 in a direction that faces each other in the left-right direction of the vehicle body, left-right vibrations of the vehicle body can be suitably absorbed by the rubber elastic body 4, the spring force of which is increased by the presence of the protrusions 5, and large vibrations that occur when the vehicle accelerates or decelerates can be suitably absorbed by the rubber elastic body 4 in parts where the protrusions 5 are not present.

[0025] Furthermore, in this embodiment, the through hole 6 formed in the protrusion 5 has a shape in which the outer circumferential dimension is longer than the inner circumferential dimension, so that the strength of the protrusion 5 can be sufficiently ensured and the occurrence of sink marks can be suppressed without making the thickness of the protrusion 5 unnecessarily large.

[0026] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the gist of the present invention. The present invention covers all technical matters included in the technical ideas described in the claims. The above-described embodiments are preferred examples, but a person skilled in the art can realize various alternatives, modifications, variations, or improvements from the contents disclosed in this specification, and these are included in the technical scope described in the appended claims.

[0027] For example, in the above embodiment, two protrusions 5 are provided on the inner surface 2c of the outer tube member 2, facing each other at 180 degrees across the inner tube member 3, but the number of protrusions 5 is not limited to two, and may be one or three or more.

[0028] In addition, in the above embodiment, the protrusion 5 is formed inside the outer tube member 2, away from both axial ends thereof, but the length of the protrusion 5 may be extended to a position that reaches one or both axial ends of the outer tube member 2. [Explanation of symbols]

[0029] 1 Body Mount 2. Outer cylinder member 2a Outer surface 2b Flange part 2c Inner surface 3. Inner cylinder member 3a Hollow hole 4. Rubber elastic body (elastic body) 5 Protrusion 5a Arc-shaped part 5b Connecting part 6 through holes 10 Holder 10a Insertion hole

Claims

1. an outer cylinder member made of resin; an inner cylindrical member disposed in a hollow portion of the outer cylindrical member; an elastic body interposed between the outer cylindrical member and the inner cylindrical member, In a body mount in which the outer cylindrical member is press-fitted and fixed into an insertion hole of a holder, the outer cylindrical member has a protrusion protruding radially inward from an inner circumferential surface, The protrusion has a hollow structure in which a through hole extending in the axial direction of the outer cylindrical member is formed. Characterized by a body mount.

2. 2. The body mount according to claim 1, The protrusions are provided in plurality at intervals along the radial direction of the outer cylindrical member. Characterized by a body mount.

3. 3. The body mount according to claim 2, The protrusions are provided at two positions that are 180 degrees apart from each other across the inner cylindrical member. Characterized by a body mount.

4. 2. The body mount according to claim 1, The through hole is formed in a shape in which the outer circumferential dimension is longer than the inner circumferential dimension. Characterized by a body mount.

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