JP-7854903-B2 - Vibration isolation device

JP7854903B2JP 7854903 B2JP7854903 B2JP 7854903B2JP-7854903-B2

Inventors

松居宏渉
村岡睦
梅村聡

Assignees

住友理工株式会社

Dates

Publication Date: 20260507
Application Date: 20220907

Claims (6)

A vibration isolation device in which a first mounting member and a second mounting member are connected by a main body rubber elastic body, The second mounting member comprises a main body rubber outer member having a first cylindrical portion fixed to the outer peripheral end of the main body rubber elastic body, and a throttling fitting having a second cylindrical portion attached to the first cylindrical portion of the main body rubber outer member in an externally fitted state. The first cylindrical portion of the main body rubber outer member is inserted axially into the second cylindrical portion of the throttling fitting, and the second cylindrical portion is fitted to the outer surface of the first cylindrical portion by diameter reduction processing. The fitting portions of the first and second cylindrical parts each have a tapered portion that becomes smaller in diameter in the direction of removal opposite to the direction of insertion of the first cylindrical part into the second cylindrical part . A vibration isolation device in which the tapered portion is provided along the entire axial direction of the first cylindrical portion .
The vibration isolation device according to claim 1 , wherein a sealing rubber is interposed between the overlapping surfaces of the tapered portions.
A vibration isolation device in which a first mounting member and a second mounting member are connected by a main body rubber elastic body, The second mounting member comprises a main body rubber outer member having a first cylindrical portion fixed to the outer peripheral end of the main body rubber elastic body, and a throttling fitting having a second cylindrical portion attached to the first cylindrical portion of the main body rubber outer member in an externally fitted state. The first cylindrical portion of the main body rubber outer member is inserted axially into the second cylindrical portion of the restrictor fitting, and a sealing rubber is interposed between the first cylindrical portion and the second cylindrical portion. The second cylindrical portion is pressed against the sealing rubber by a diameter reduction process and fitted to the outer surface of the first cylindrical portion. The vibration isolation device has a tapered portion in the second cylindrical portion that contacts the sealing rubber, with the tapered portion having a smaller diameter in the direction of withdrawal opposite to the direction of insertion of the first cylindrical portion into the second cylindrical portion.
The first cylindrical portion of the main body rubber outer member is provided with a first outer flange portion that protrudes outward from one end in the axial direction, The second cylindrical portion of the aforementioned throttling fitting is provided with a second outer flange portion that protrudes outward from one end in the axial direction, The tapered portion provided in at least one of the first cylindrical portion and the second cylindrical portion has a gradually decreasing diameter in the axial direction toward the first outer flange portion and the second outer flange portion. A vibration isolation device according to any one of claims 1 to 3 , wherein a crimping fitting is provided for crimping and fixing the first outer flange portion and the second outer flange portion which are superimposed on each other in a contact state.
The fluid-filled vibration isolation device is provided with a pressure-receiving chamber, the wall portion of which is made of the main body's rubber elastic material, and a balance chamber, the wall portion of which is made of a flexible membrane, both of which are filled with an incompressible fluid, and an orifice passage that connects the pressure-receiving chamber and the balance chamber to each other. The vibration isolation device according to any one of claims 1 to 3 , wherein the diaphragm fitting is a diaphragm outer fitting fixed to the outer peripheral end of the flexible membrane.
The lower end of the first cylindrical portion of the main body rubber outer member is provided with a first inner flange portion that protrudes inward, The lower end of the second cylindrical portion of the aforementioned throttling fitting is provided with a second inner flange portion that protrudes inward, The vibration isolation device according to claim 5, wherein the first inner flange portion and the second inner flange portion are separated from each other in the vertical direction and face each other, and a partition member that separates the pressure receiving chamber and the equilibrium chamber is sandwiched between the facing first inner flange portion and the second inner flange portion.

Description

This invention relates to a vibration damping device and a method for manufacturing a vibration damping device, both applicable to engine mounts and the like in automobiles. Conventionally, vibration isolation devices are known that are applied to engine mounts and other components that vibrationally connect the power unit and vehicle body of an automobile. These vibration isolation devices, for example, as described in Japanese Patent Publication No. 7-190130 (Patent Document 1), have a structure in which a first mounting member and a second mounting member are connected by a main rubber elastic body. Japanese Unexamined Patent Publication No. 7-190130 Cross-sectional view showing an engine mount as the first embodiment of the present invention.Cross-sectional view of the first integrally vulcanized molded product constituting the engine mount shown in Figure 1.Cross-sectional view of the second integrally vulcanized molded product constituting the engine mount shown in Figure 1.Figure 1 shows a cross-sectional view of a part of the mount body that constitutes the engine mount.A cross-sectional view showing a part of the mount body constituting an engine mount as another embodiment of the present invention. The embodiments of the present invention will be described below with reference to the drawings. Figure 1 shows an engine mount 10 for an automobile as a first embodiment of a vibration damping device with a structure according to the present invention. The engine mount 10 has a structure in which an outer bracket 14 is attached to a mount body 12. The mount body 12 comprises a first integrally vulcanized molded product 22 (see Figure 2) in which a first mounting member 16 and a second mounting member 18 are connected by a main body rubber elastic body 20. In the following description, the vertical direction generally refers to the vertical direction in Figure 1, which is the direction of extension of the mount's central axis. The first mounting member 16 is a rigid member made of metal or the like, and integrally comprises a roughly disc-shaped stopper portion 24, a roughly inverted cone-shaped fixing portion 26 that protrudes downward from the stopper portion 24 and whose diameter decreases downward, and a roughly cylindrical threaded portion 28 that protrudes upward from the stopper portion 24. The first mounting member 16 has a screw hole 30 that opens on the upper surface of the threaded portion 28 and extends vertically, and a mounting bolt 32 is screwed into the screw hole 30, protruding upward. The second mounting member 18 includes a main rubber outer member 34. The main rubber outer member 34 is a hard member made of metal or the like, similar to the first mounting member 16, and is an annular shape with a large diameter. More specifically, the main rubber outer member 34 has a first cylindrical portion 36 which is roughly cylindrical, and integrally includes a first outer flange portion 38 that protrudes outward from the upper end of the first cylindrical portion 36 and a first inner flange portion 40 that protrudes inward from the lower end of the first cylindrical portion 36. As shown in Figure 2, the first cylindrical portion 36 is tapered cylindrical in shape, with the diameter decreasing upward, and the entire portion is a first tapered portion 42. The inclination angle of the first tapered portion 42 with respect to the axial direction is preferably within the range of 5 to 30°. This allows for effective fitting and fixing of the first tapered portion 42 and the second tapered portion 66 during the fitting of the second tapered portion 66 (described later), while effectively applying a downward force component to the main rubber outer member 34. The radial width dimension of the first outer flange portion 38 is larger than the radial width dimension of the first inner flange portion 40. Furthermore, the curvature of the curved portion connecting the first cylindrical portion 36 and the first outer flange portion 38 is larger than the curvature of the curved portion connecting the first cylindrical portion 36 and the first inner flange portion 40. The first mounting member 16 and the main rubber outer member 34 are connected by the main rubber elastic body 20. The main rubber elastic body 20 has a roughly frustoconical shape; the fixing portion 26 of the first mounting member 16 is vulcanized and bonded to the smaller diameter upper end, while the main rubber outer member 34 is vulcanized and bonded to the larger diameter lower outer surface. The first mounting member 16 has a stopper rubber 44, integrally formed with the main rubber elastic body 20, fixed to the outer surface and upper surface of the stopper portion 24. The main rubber outer member 34 has its entire inner surface of the first cylindrical portion 36, the upper surface of the inner portion of the first outer flange portion 38, and the entire surface of the first inner flange portion 40 fixed to the main rubber elastic bod