Anti-vibration member and method for mounting Anti-vibration member

Abstract

The present invention provides, among other things, an anti-vibration member which reduces both axial and radial vibrations and which is more compact.　An engine mount 1 has an inner cylinder member 3 and a rubber elastic body 4 provided on an outer circumference of the inner cylinder member 3, and is held in an insertion hole 5. The rubber elastic body 4 has a plurality of protrusions 6 protruding outward in a radial direction of the inner cylinder member 3. The protrusions 6 include: a first inclined protrusion 6A inclined in the direction of increasing spacing with respect to the cylinder member 3 proceeding from one side toward the other side in an axial direction of the cylinder member 3; and a second inclined protrusion 6B inclined in the direction of increasing spacing with respect to the cylinder member 3 proceeding from the other side toward the one side in the axial direction. The first inclined protrusion 6A and the second inclined protrusion 6B are arranged to be spaced apart from each other in a circumferential direction of the cylinder member 6.

Description

Vibration isolation member and method of mounting vibration isolation member

[0001] The present invention relates to a vibration isolation member and a method of mounting the vibration isolation member.

[0002] As a vibration isolation device used in a vehicle, Patent Document 1 discloses an engine mount in which a pair of mount bodies are fitted into a cylindrical connecting member from both axial sides and arranged in series. Each mount body of this engine mount has a structure in which an inner shaft member and an outer cylinder member are elastically connected by a main body rubber elastic body. Each main body rubber elastic body has a substantially cylindrical shape with a thick wall and a large diameter, and the inner peripheral surface is vulcanized and adhered to the outer peripheral surface of the inner shaft member, and the outer peripheral surface is vulcanized and adhered to the inner peripheral surface of the outer cylinder member. Further, the main body rubber elastic body has a pair of rubber arm portions that connect the inner shaft member and the outer cylinder member, and each rubber arm portion has a tapered shape in which one end surface in the axial direction inclines outward in the axial direction as it goes to the inner peripheral side.

[0003] When a roll load in the left - right direction (radial direction orthogonal to the axis) is input between the inner shaft member and the outer cylinder member of the mount body, a pair of rubber arm portions are selectively compressed between the inner shaft member and the outer cylinder member. Therefore, due to a large spring constant by the compression spring component, the relative displacement amount between the inner shaft member and the outer cylinder member is effectively limited, and the lateral vibration (roll displacement) is reduced.

[0004] Also, when an axial load is input between the inner shaft member and the outer cylinder member, a pair of rubber arm portions of the main body rubber elastic body are sheared between the inner shaft member and the outer cylinder member and are compressed between the inner protruding portion and the outer protruding portion. For this reason, when an axial load is input between the inner shaft member and the outer cylinder member, not only shear deformation but also compression deformation occurs simultaneously in the main body rubber elastic body, so that the axial spring constant is set large, and the longitudinal vibration is reduced.

[0005] Furthermore, in the above-mentioned engine mount, a pair of mount bodies are inserted into the openings on both sides of the connecting member in opposite directions and press-fitted into place, so that the rubber elastic body of either one of the mount bodies is selectively compressed depending on the direction of the input load.

[0006] Japanese Patent Publication No. 2015-132282

[0007] However, vibration-damping members such as the engine mount described in Patent Document 1 have the problem that the length of the vibration-damping member in the axial direction becomes long because a set of mount bodies of the same structure are arranged in opposite directions in the axial direction.

[0008] Therefore, the object of the present invention is to reduce both axial and radial runout and to provide a more compact vibration-damping member and a method for mounting the vibration-damping member.

[0009] The main invention for achieving this objective is a vibration damping member held in an insertion hole, comprising a cylindrical member and a rubber elastic body provided on the outer circumference of the cylindrical member, wherein the rubber elastic body has a plurality of protrusions projecting outward in the radial direction of the cylindrical member, and the protrusions include a first inclined protrusion that is inclined in a direction that widens the distance from the cylindrical member from one side to the other in the axial direction of the cylindrical member, and a second inclined protrusion that is in a direction that widens the distance from the cylindrical member from the other side to the one side in the axial direction, and the first inclined protrusion and the second inclined protrusion are arranged with an interval between them in the circumferential direction of the cylindrical member.

[0010] According to the present invention, it is possible to reduce both axial and radial runout and provide a more compact vibration-damping member and a method for mounting the vibration-damping member. Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

[0011] This is a view of the engine mount according to the embodiment, seen from the axial direction. This is a cross-sectional view taken along line A-A in Figure 1. This is a cross-sectional view taken along line B-B in Figure 1. This is a cross-sectional view showing a mounting method in which two engine mounts 1 are arranged side by side in the axial direction. This is a perspective view showing the engine mount 1 with the outer cylinder member hidden.

[0012] An embodiment of the vibration damping device and method for mounting the vibration damping device of the present invention will be described with reference to the drawings. In this embodiment, an engine mount is used as an example of a vibration damping device according to the present invention to fix the engine to the vehicle body. However, the vibration damping device is not limited to an engine mount, but can be any device interposed between two objects at a joint to prevent vibration.

[0013] As shown in Figures 1 to 3, the engine mount 1 according to this embodiment comprises an outer cylinder member 2, an inner cylinder member 3 coaxially arranged within the hollow portion of the outer cylinder member 2, and a rubber elastic body 4 interposed between the outer cylinder member 2 and the inner cylinder member 3 to connect them.

[0014] In the following explanation, the direction along the central axis O of the outer cylinder member 2 and the inner cylinder member 3 is referred to as the axial direction. In a plan view of the engine mount 1 from the axial direction, the direction intersecting the central axis O is referred to as the radial direction, and the side away from the central axis O in the radial direction is referred to as the outer side. The direction that circles around the central axis O is referred to as the circumferential direction.

[0015] The inner cylinder member 3 is a cylindrical metal member positioned at the center of the engine mount 1. The inner cylinder member 3 has a hollow hole 3A that penetrates it axially, and is fixed to the vehicle body side, such as the frame, via bolts inserted through the hollow hole 3A. Both axial ends of the inner cylinder member 3 protrude from both axial ends of the outer cylinder member 2. Note that the method of fixing the inner cylinder member 3 is not limited to bolts; for example, it may be a method of press-fitting via rubber.

[0016] The outer cylinder member 2 is a cylindrical member made of resin and is positioned radially outward from the inner cylinder member 3, spaced apart. The outer circumferential surface 2A of the outer cylinder member 2 is the part that is press-fitted into the insertion hole 5 of the engine (not shown), which is a mounted component on the vehicle body. The engine mount 1 may be configured such that the inner cylinder member 3 is fixed to the engine side and the outer cylinder member 2 is fixed to the vehicle body side, such as the frame. Furthermore, the outer cylinder member 2 is not limited to resin and may be made of metal such as aluminum or iron.

[0017] The rubber elastic body 4 is vulcanized and bonded to the outer cylinder member 2 and the inner cylinder member 3 by setting the outer cylinder member 2 and the inner cylinder member 3 in a rubber vulcanization mold, injecting rubber material between them, and vulcanizing and molding them.

[0018] As shown in Figures 1 and 5, the engine mount 1 has a rubber elastic body 4 interposed between the outer cylinder member 2 and the inner cylinder member 3, which has a plurality of protrusions 6 that project outward toward the outer cylinder member 2 side, i.e., toward the radially outward direction of the inner cylinder member 3. In this embodiment, the rubber elastic body 4 provided on the outer circumference of the outer cylinder member 2 has four protrusions 6, which are arranged at equal intervals in the circumferential direction. That is, the four protrusions 6 are arranged at 90-degree intervals from each other in the circumferential direction.

[0019] The four protrusions 6 each have a first inclined protrusion 6A that inclins in a direction that widens the distance from the inner cylinder member 3 from one side in the axial direction of the inner cylinder member 3 (left side in Figures 2 and 3) to the other side (right side in Figures 2 and 3), and a second inclined protrusion 6B that inclins in a direction that widens the distance from the cylinder member from the other side in the axial direction. In other words, the first inclined protrusion 6A and the second inclined protrusion 6B are inclined in opposite directions.

[0020] There are two first inclined projections 6A and two second inclined projections 6B, and they are arranged alternately in the circumferential direction of the inner cylinder member 3. Therefore, the two first inclined projections 6A and the two second inclined projections 6B are arranged along the radial direction of the inner cylinder member 3 and sandwiching the inner cylinder member 3.

[0021] As described above, the engine mount 1 according to this embodiment can provide the following effects.

[0022] In this embodiment, the engine mount 1 has a rubber elastic body 4 provided on the outer circumference of the inner cylinder member 3 and connecting it to the outer cylinder member 2. This rubber elastic body 4 protrudes outward in the radial direction of the inner cylinder member 3 and has a projection 6 that is inclined in the axial direction of the inner cylinder member 3 in a direction that widens the gap between it and the inner cylinder member 3. Therefore, when a radial load is applied, the rubber elastic body 4 is more easily deformed than when connected by a non-inclined rubber elastic body 4. In other words, the engine mount 1 of this embodiment makes it possible to widen the region in which the load-displacement characteristics change more linearly when a radial load is applied to the inner cylinder member 3 compared to when connected by a non-inclined rubber elastic body 4. As a result, it is possible to exhibit more linear and smoother load-displacement characteristics.

[0023] Furthermore, since the first inclined projection 6A and the second inclined projection 6B of the rubber elastic body 4 are inclined in different directions, their spring stiffness differs when an axial load is applied to the inner cylinder member 3. More specifically, when a load is applied to the inner cylinder member 3 pressing from one side to the other, the first inclined projection 6A, which is inclined so that the distance between the inner cylinder member 3 and the projection 6A widens from one side to the other in the axial direction of the inner cylinder member 3, deforms in the compression direction, resulting in higher spring stiffness. The second inclined projection 6B, which is inclined so that the distance between the inner cylinder member 3 and the projection 6B widens from the other side to the one side in the axial direction, deforms in the tension direction, resulting in lower spring stiffness and a more linear change in load-displacement characteristics.

[0024] On the other hand, when a load is applied to the inner cylinder member 3 from one side to the other, the first inclined projection 6A deforms in the tension direction, so its spring stiffness decreases and the load-displacement characteristics change more linearly, while the second inclined projection 6B deforms in the compression direction, so its spring stiffness increases. Furthermore, since the engine mount 1 of this embodiment has both the first inclined projection 6A and the second inclined projection 6B, it is possible to change the load-displacement characteristics more linearly regardless of the direction in which a load is applied to press the inner cylinder member 3 in the axial direction.

[0025] Furthermore, since the engine mount 1 is provided with an equal number of first inclined protrusions 6A and second inclined protrusions 6B, and is arranged alternately at equal intervals in the circumferential direction, it is possible to effectively dampen vibrations against loads acting in either the axial or radial direction.

[0026] Furthermore, since the engine mount 1 has a pair of first inclined protrusions 6A and a pair of second inclined protrusions 6B, which are arranged radially and located on opposite sides of the inner cylinder member 3, it is possible to further balance vibration damping.

[0027] In the above embodiment, an example was described in which the rubber elastic body 4 has four protrusions 6, consisting of two first inclined protrusions 6A and two second inclined protrusions 6B. However, it is not limited to this, and it may have four or more protrusions 6. For example, it may have three first inclined protrusions 6A and three second inclined protrusions 6B, arranged alternately at equal intervals in the circumferential direction, or it may have four first inclined protrusions 6A and four second inclined protrusions 6B, arranged alternately at equal intervals in the circumferential direction. Furthermore, the protrusions 6 do not necessarily have to be arranged at equal intervals. For example, when viewed from the axial direction, it is acceptable for the multiple protrusions 6 to be arranged symmetrically with respect to a straight line passing through the center of the inner cylinder member 3.

[0028] Since the engine mount 1 has a first inclined projection 6A and a second inclined projection 6B that are spaced apart from each other in the circumferential direction, it is possible to reduce the axial size of the engine mount 1 compared to when the first inclined projection 6A and the second inclined projection 6B are arranged in a continuous line in the axial direction. As a result, both axial and radial runout can be reduced, making it possible to provide a more compact engine mount 1.

[0029] In the above embodiment, a mounting method using a single engine mount 1 was described, but multiple engine mounts 1 may be used and arranged to connect in the axial direction of the inner cylinder member 3. In this case, as shown in Figure 4, it is desirable to connect the first inclined projection 6A and the second inclined projection 6B in the axial direction of two adjacent engine mounts 1, or in other words, to arrange the two engine mounts 1 so that projections 6 with different inclination directions are connected in the axial direction.

[0030] Furthermore, although the above embodiment describes an example in which the engine mount 1 has an outer cylinder member 2, it is not limited to this, and the mounting method may also be such that the outer cylinder member 2 is not provided, and the rubber elastic body 4 is directly in contact with the inner surface of the insertion hole 5 and press-fitted.

[0031] It should be noted that the present invention is not limited to the embodiments described above, and various modifications are possible without departing from the spirit of the invention. All technical matters included in the technical concept described in the claims are subject to the present invention. The embodiments described above are preferred examples, but those skilled in the art can realize various alternatives, modifications, variations, or improvements from the contents disclosed herein, and these are included in the technical scope described in the appended claims.

[0032] 1. Engine mount (vibration damper) 2. Outer cylinder member 2A. Outer surface 3. Inner cylinder member (tube member) 3A. Hollow hole 4. Rubber elastic body 5. Insertion hole 6. Protrusion 6A. First inclined protrusion 6B. Second inclined protrusion O. Central axis

Claims

1. A vibration-damping member having a cylindrical member and a rubber elastic body provided on the outer circumference of the cylindrical member, wherein the rubber elastic body has a plurality of protrusions projecting outward in the radial direction of the cylindrical member, the protrusions having a first inclined protrusion that is inclined in a direction that widens the distance from the cylindrical member from one side to the other in the axial direction of the cylindrical member, and a second inclined protrusion that is in a direction that widens the distance from the cylindrical member from the other side to the one side in the axial direction, and the first inclined protrusion and the second inclined protrusion are arranged at intervals from each other in the circumferential direction of the cylindrical member.

2. A vibration-damping member according to claim 1, characterized in that the first inclined projection and the second inclined projection are provided in the same number.

3. The vibration-damping member according to claim 1, characterized in that the first inclined projection and the second inclined projection are arranged alternately in the circumferential direction.

4. The vibration-damping member according to claim 1, characterized in that the plurality of protrusions are arranged symmetrically with respect to a straight line passing through the center of the cylindrical member when viewed from the axial direction.

5. The vibration-damping member according to claim 1, wherein the plurality of protrusions are provided in pairs of two, and the two pairs of protrusions are arranged in the radial direction and are located on opposite sides of the cylindrical member.

6. The vibration-damping member according to claim 1, characterized in that four or more protrusions are provided.

7. A method for mounting vibration-damping members according to claim 1, characterized in that a plurality of vibration-damping members are arranged to connect in the axial direction of the cylindrical member.

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