JP6998415B2 - Anti-vibration support device - Google Patents

Description

The present invention relates to a vibration-proof support device, and more particularly to a vibration-proof support device that supports a supported member in a vibration-proof manner with respect to a support member using a rubber bush.

A shaft provided on a support member as a vibration-proof support device that supports a supported member such as an engine accessory device such as an air cleaner or a shift lever device in a vibration-proof manner with respect to a support member such as an engine or a vehicle body in an automobile or the like. A tubular rubber bush having an annular groove provided on the outer periphery of the axial middle portion was used to fit into the central hole for receiving the body and the opening provided in the supported member to fit into the opening. Anti-vibration support devices are known (for example, Patent Documents 1 and 2).

Japanese Unexamined Patent Publication No. 11-223162 Jikkenhei No. 2-8625

With the conventional anti-vibration support device, it is difficult to suppress foreign matter from entering the central hole that receives the shaft body and to reduce the spring of the rubber bush at the same time.

In addition, it is difficult to achieve both suppression of propagation of slight vibrations between the supported member and the supported member and relaxation of stress concentration due to the supported member moving in large contact with the supported member due to vibration of a large amplitude.

An object to be solved by the present invention is to suppress foreign matter from entering the central hole that receives the shaft body in the anti-vibration support device, and to reduce the spring of the rubber bush at the same time.

The anti-vibration support device according to one embodiment of the present invention receives the support member (10) including the shaft body (54, 56), the supported member (20) including the opening (22), and the shaft body. A vibration-proof support device having a rubber bush (30) including a central hole (34) and an annular groove portion (36) fitted to the opening, wherein the rubber bush has a cylindrical portion (32) and the cylindrical portion. A plurality of inner ridges (38) provided on the inner peripheral surface of the inner peripheral surface so as to project inward in the radial direction at predetermined intervals in the circumferential direction and extend in the axial direction, and define the central hole, and the above. A plurality of outer ridges (40) provided on the outer peripheral surface of the cylindrical portion so as to project radially outward at predetermined intervals in the circumferential direction and extend in the axial direction to form the annular groove portion. The inner ridges and the outer ridges are alternately arranged in the circumferential direction.

According to this configuration, it is possible to suppress foreign matter from entering the central hole that receives the shaft body and to reduce the spring of the rubber bush.

In the anti-vibration support device, preferably, the inner ridge portion and the outer ridge portion are arranged alternately with each other without overlapping in the circumferential direction.

According to this configuration, it is possible to suppress foreign matter from entering the central hole that receives the shaft body, and to further reduce the spring of the rubber bush.

In the anti-vibration support device, preferably, the axial end portion (38A) of each inner ridge portion is chamfered inward in the radial direction.

According to this configuration, it is possible to suppress the propagation of micro-vibration between the supported member and the supported member and to alleviate the stress concentration due to the supported member moving in large contact with the supported member due to the vibration of a large amplitude. ..

In the anti-vibration support device, preferably, the axial end portion (40A) of each outer ridge portion has a chevron shape.

According to this configuration, it is possible to suppress the propagation of micro-vibration between the supported member and the supported member and to alleviate the stress concentration due to the supported member moving in large contact with the supported member due to the vibration of a large amplitude. ..

In the anti-vibration support device, preferably, the amount of each outer ridge portion protruding outward in the radial direction decreases toward the end portion from the central portion in the axial direction.

According to this configuration, it is possible to suppress the propagation of micro-vibration between the supported member and the supported member and to alleviate the stress concentration due to the supported member moving in large contact with the supported member due to the vibration of a large amplitude. ..

In the anti-vibration support device, preferably, the support member has a washer (52) arranged to be in contact with the first end surface of the rubber bush including each outer ridge portion, and the support member is the opposite of the first end surface. It has a plane (12) on the side that contacts the second end face of the rubber bush, including each outer ridge.

According to this configuration, foreign matter is suppressed from entering the central hole from the axial end portion of the central hole.

In the vibration-proof support device, preferably, a collar member (50) inserted into the center hole and a fastening bolt (54) that penetrates the collar member and screw-engages the support member as the shaft body. Have.

According to this configuration, the maximum screwing amount of the fastening bolt is appropriately set by the axial length of the collar member.

In the anti-vibration support device, preferably, as the shaft body, the support member has a large diameter portion (56A) penetrating the central hole, is continuous with one end of the large diameter portion, and has a smaller diameter than the large diameter portion. Has a stepped bolt that includes a threaded portion (56B) that is thread-engaged to.

According to this configuration, the maximum screwing amount of the stepped bolt is appropriately set by the shaft length of the large diameter portion.

According to the anti-vibration support device according to the present invention, it is possible to suppress foreign matter from entering the gap between the central hole that receives the shaft body and the shaft body, and to reduce the spring of the rubber bush.

Sectional drawing which shows Embodiment 1 of the anti-vibration support device by this invention. A perspective view showing a rubber bush of the anti-vibration support device according to the first embodiment. A perspective view showing a rubber bush of the anti-vibration support device according to the second embodiment. Cross-sectional view of the anti-vibration support device according to the third embodiment

Hereinafter, the first embodiment of the anti-vibration support device according to the present invention will be described with reference to FIGS. 1 and 2.

The vibration-proof support device of the first embodiment is for vibration-proof support of an in-vehicle device such as an air cleaner with respect to the vehicle body of an automobile, and a bracket 10 attached to the vehicle body as a support member is attached to the air cleaner as a supported member. It has a support arm 20.

A rubber bush 30 for vibration insulation is provided between the bracket 10 and the support arm 20.

The rubber bush 30 has a cylindrical portion 32. The cylindrical portion 32 includes a central hole 34 penetrating in the axial direction and an annular groove portion 36 formed on the outer periphery of the intermediate portion in the axial direction. A substantially U-shaped opening 22 formed in the support arm 20 is fitted in the annular groove portion 36. As a result, the rubber bush 30 supports the support arm 20.

The rubber bush 30 includes a plurality of inner ridges 38 provided on the inner circumference of the cylindrical portion 32 so as to project inward in the radial direction at predetermined intervals in the circumferential direction and extend in the axial direction, and the cylindrical portion. The outer periphery of the 32 includes a plurality of outer ridges 40 provided so as to project outward in the radial direction and extend in the axial direction at predetermined intervals in the circumferential direction.

Each inner ridge 38 defines a central hole 34 penetrating in the axial direction by a virtual circle connecting the radially inward projecting ends to each other.

An annular groove portion 36 is formed in the middle portion in the axial direction of each outer ridge portion 40. A substantially U-shaped opening 22 formed in the support arm 20 is fitted in the annular groove portion 36. As a result, the rubber bush 30 supports the support arm 20.

The amount of protrusion of each outer ridge 40 toward the end in the axial direction of the cylindrical portion 32 decreases in the radial direction. As a result, the rubber bush 30 has a barrel shape as a whole.

The inner ridge 38 and the outer ridge 40 are arranged alternately with each other without overlapping in the circumferential direction of the cylindrical portion 32.

A cylindrical collar member 50 is inserted into the center hole 34. The collar member 50 has a shaft length equal to or shorter than the shaft length of the rubber bush 30 in the free state.

On the rubber bush 30, a circular plate-shaped washer 52 with a hole is arranged so as to come into contact with the first end surface 30A of the rubber bush 30 including each outer protrusion 40. The bracket 10 has a flat surface 12 on the opposite side of the first end surface 30A and in contact with the second end surface 30B of the rubber bush 30 including each outer ridge 40.

As a result, both ends of the central hole 34 in the axial direction are closed, and foreign matter is suppressed from entering the central hole 34 from both ends.

A fastening bolt 54 with a head is inserted into the collar member 50 and the washer 52. The fastening bolt 54 penetrates the collar member 50 and the washer 52 and screw-engages with the screw hole 14 formed in the bracket 10.

As a result, the rubber bush 30 is sandwiched between the washer 52 and the bracket 10 in the axial direction, and is attached to the bracket 10 in a state where the support arm 20 is supported by the annular groove portion 36. In other words, the bracket 10 vibrationally supports the support arm 20 via the rubber bush 30.

The maximum screwing amount of the fastening bolt 54 into the screw hole 14 is determined by the axial length of the collar member 50. As a result, when the axial length of the collar member 50 is shorter than the axial length of the rubber bush 30 in the free state, the rubber bush 30 is elastically deformed (compressively deformed) in the axial direction, that is, in a state where a preload is applied. Can be assembled.

In the rubber bush 30, the inner and outer ridges 38 and the outer ridges 40 are alternately arranged in the circumferential direction on the inner circumference and the outer circumference of the cylindrical portion 32, and a central hole is formed in the middle portion in the axial direction of the rubber bush 30. There is no portion that opens 34 radially outward, that is, the central hole 34 is open outward only at both ends in the axial direction to receive the fastening bolt 54.

As a result, foreign matter does not enter the inside of the cylindrical portion 32, that is, the central hole 34 from the intermediate portion in the axial direction of the rubber bush 30. As a result, the anti-vibration characteristics due to elastic deformation of the rubber bush 30 do not change due to the intrusion of foreign matter into the center hole 34, and the anti-vibration characteristics due to wear of the contact surface of the rubber bush 30 do not change. Stable anti-vibration characteristics can be obtained even after long-term use.

Since the inner ridge 38 and the outer ridge 40 are alternately arranged in the circumferential direction of the cylindrical portion 32 and do not include a portion that overlaps in the circumferential direction of the cylindrical portion 32, foreign matter is prevented from entering. In addition, the degree of freedom in designing anti-vibration characteristics, including lowering the spring of the rubber bush 30 in terms of expansion and contraction deformation and bending deformation in the axial direction, is increased. In particular, since the material of the rubber bush 30 is a low spring, it is not necessary to make it soft, and the durability of the rubber bush 30 can be improved.

Further, as each outer ridge portion 40 moves from the central portion in the axial direction of the cylindrical portion 32 toward the end portion, the amount of protrusion outward in the radial direction decreases, and the rubber bush 30 has a barrel shape as a whole. Therefore, the rubber bush 30 has a non-linear spring characteristic with respect to compressive deformation in the axial direction, and also has a non-linear spring characteristic with a gentle compressive repulsive force against compressive deformation in the circumferential direction, and has a small amplitude. It shows a low spring constant for micro-vibration, and the spring constant increases as the amplitude increases.

As a result, it is possible to suppress the propagation of slight vibrations between the bracket 10 and the support arm 20, and to alleviate the stress concentration caused by the support arm 20 moving in large contact with the bracket 10 due to the vibration of a large amplitude.

Next, the second embodiment of the anti-vibration support device according to the present invention will be described with reference to FIG. In FIG. 3, the portion corresponding to FIG. 2 is designated by the same reference numeral as that shown in FIG. 2, and the description thereof will be omitted.

In the second embodiment, the axial end 38A of each inner ridge 38 is chamfered inward in the radial direction. The axial end 40A of each outer ridge 40 is formed in a chevron shape.
As a result, the rubber bush 30 exhibits a lower spring constant for micro-vibrations having a small amplitude. As a result, the propagation suppression of micro-vibration between the bracket 10 and the support arm 20 is effectively performed without the rubber bush 30 being made of a soft rubber material.

Next, the third embodiment of the anti-vibration support device according to the present invention will be described with reference to FIG. In FIG. 4, the portion corresponding to FIG. 1 is designated by the same reference numeral as that shown in FIG. 1, and the description thereof will be omitted.

In the third embodiment, the collar member 50 is omitted, and as fastening bolts, a large diameter portion 56A penetrating the center hole 34 and a screw of the bracket 10 continuous with one end of the large diameter portion 56A and having a smaller diameter than the large diameter portion 56A. A stepped bolt 56 including a threaded portion 56B that screw-engages the hole 14 is used.

In the third embodiment, the maximum screwing amount of the stepped bolt 56 with respect to the screw hole 14 is determined by the axial length of the large diameter portion 56A. As a result, when the axial length of the large diameter portion 56A is shorter than the axial length of the rubber bush 30 in the free state, the rubber bush 30 is elastically deformed (compressively deformed) in the axial direction, that is, a preloaded state is applied. It is assembled with.

The present invention has been described above with respect to preferred embodiments thereof, but as can be easily understood by those skilled in the art, the present invention is not limited to such embodiments and deviates from the gist of the present invention. It can be changed as appropriate to the extent that it does not. In addition, not all of the components shown in the above embodiments are indispensable, and they can be appropriately selected as long as they do not deviate from the gist of the present invention.

10: Bracket 12: Flat surface 14: Screw hole 20: Support arm 22: Opening 30: Rubber bush 30A: First end surface 30B: Second end surface 32: Cylindrical portion 34: Center hole 36: Circular groove portion 38: Inner ridge portion 38A : End 40: Outer ridge 40A: End 50: Collar member 52: Washer 54: Fastening bolt 56: Stepped bolt 56A: Large diameter 56B: Thread

Claims (8)

Support members including the shaft and
Supported members including openings and
A vibration-proof support device having a central hole for receiving the shaft body and a rubber bush including an annular groove portion fitted to the opening.
The rubber bush is
Cylindrical part and
A plurality of inner ridges provided on the inner peripheral surface of the cylindrical portion so as to project radially inward at predetermined intervals in the circumferential direction and extend in the axial direction, and define the central hole.
A plurality of outer ridges provided on the outer peripheral surface of the cylindrical portion so as to project radially outward at predetermined intervals in the circumferential direction and extend in the axial direction to form the annular groove portion. ,
A vibration-proof support device in which the inner ridges and the outer ridges are alternately arranged in the circumferential direction. The anti-vibration support device according to claim 1, wherein the inner ridge portion and the outer ridge portion are arranged alternately with each other without overlapping in the circumferential direction. The anti-vibration support device according to claim 2, wherein the end portion of each inner ridge portion in the axial direction is inclined inward in the radial direction in a chamfered manner. The anti-vibration support device according to any one of claims 1 to 3, wherein the end of each outer ridge portion in the axial direction has a chevron shape. The anti-vibration support device according to claim 4, wherein the amount of protrusion of each outer ridge portion in the radial direction decreases from the central portion in the axial direction toward the end portion. It has a washer arranged to contact the first end face of the rubber bush, including each outer ridge.
The vibration isolation according to any one of claims 1 to 5, wherein the support member has a flat surface on the opposite side of the first end surface and in contact with the second end surface of the rubber bush including each outer protrusion. Support device. The collar member inserted into the center hole and
The anti-vibration support device according to any one of claims 1 to 6, wherein the shaft body includes a fastening bolt that penetrates the collar member and screw-engages the support member. As the shaft body, a stepped bolt including a large-diameter portion penetrating the central hole and a threaded portion continuous with one end of the large-diameter portion and having a smaller diameter than the large-diameter portion and screw-engaged with the support member. The anti-vibration support device according to any one of claims 1 to 6.

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