JP-7854906-B2 - Cylindrical vibration isolation device

Inventors

• 縄司 睦
• 安田 恭宣

Assignees

• 住友理工株式会社

Dates

Publication Date

20260507

Application Date

20220913

Claims (6)

1. A cylindrical vibration isolation device in which an inner shaft member and an outer cylindrical member are connected by a main body rubber elastic material, The inner body constituting the inner shaft member is cylindrical in shape, extending axially with a certain cross-sectional shape. A first plate member and a second plate member, each having a larger diameter than the inner body, are superimposed on both axial ends of the inner body, and these first and second plate members are fixed to the inner circumferential surface of the inner body. A cylindrical vibration isolation device in which the first plate member and the second plate member attached to the inner body have different shapes from each other.
2. The inner body is a metal member formed by forging or drawing. The cylindrical vibration isolation device according to claim 1, wherein the first plate member and the second plate member are press fittings.
3. The cylindrical vibration isolation device according to claim 2, wherein the same pressed metal fitting is used for both the first and second plate members.
4. The cylindrical vibration damping device according to claim 3, wherein the first plate member and the second plate member have different shapes in the portions that protrude from the inner body toward the outer circumference, while having the same shape in the portions attached to the inner body toward the inner circumference.
5. The inner body has a groove formed on its inner circumferential surface that opens and extends linearly in the axial direction. The first plate member and the second plate member are each equipped with a fixing piece that is inserted into the groove of the inner body. The cylindrical vibration damping device according to claim 1 or 2, wherein the fixing piece has a fitting portion at its tip that is wider than the base portion, and the fitting portion is fitted into the groove and fixed.
6. The first plate member is a seating surface member that forms a seating surface for a bolt inserted into the inner shaft member. The cylindrical vibration damping device according to claim 1 or 2, wherein the second plate member is provided with a guide surface on its outer circumference that becomes smaller in diameter in the axial direction outward, and serves as a guide member for guiding the mounting position of the inner shaft member with respect to the mounting target member.

Description

This invention relates to a cylindrical vibration damping device used in automobile engine mounts and the like. Conventionally, cylindrical vibration dampers have been used in applications such as engine mounts, subframe mounts, and suspension bushings in automobiles. As disclosed in Japanese Patent Publication No. 2010-203526 (Patent Document 1), etc., cylindrical vibration dampers have a structure in which an inner shaft member and an outer cylindrical member are connected by a main rubber elastic body. Japanese Patent Publication No. 2010-203526 Front view showing a cylindrical vibration isolation device as the first embodiment of the present invention.Rear view of the cylindrical vibration isolation device shown in Figure 1.Sectional view of III-III in Figure 1Figure 1, section view between IV and IVFigure 3, V-V cross-sectional viewFront view of the integrally vulcanized rubber elastic body that constitutes the cylindrical vibration damping device shown in Figure 1.Figure 6, section view between VII and VIIFigure 7, section view between VIII and VIIIFront view showing an enlarged view of the press fittings that constitute the cylindrical vibration damping device in Figure 1.Front view showing a cylindrical vibration isolation device as a second embodiment of the present invention.Figure 10: Cross-sectional view along line XI-XIFigure 10 is a front view showing an enlarged view of the press fittings that constitute the cylindrical vibration damping device. The embodiments of the present invention will be described below with reference to the drawings. Figures 1 to 5 show a cylindrical vibration isolation device 10 as a first embodiment of the present invention. The cylindrical vibration isolation device 10 has a structure in which an inner shaft member 12 and an outer cylindrical member 14 are connected by a main rubber elastic body 16. In the following description, as a general rule, the vertical direction refers to the vertical direction in Figure 1, the left-right direction refers to the left-right direction in Figure 1, and the front-back direction refers to the vertical direction in Figure 3. The inner shaft member 12 comprises a cylindrical inner body 18. As shown in Figures 6 to 8, the inner body 18 is formed, for example, from metal, and extends continuously in the axial direction with a substantially constant cross-sectional shape, preferably formed by forging or drawing. The inner body 18 has a substantially cylindrical outer surface. The inner body 18 has a central hole 20 that penetrates in the axial direction, and in this embodiment, the central hole 20 has a substantially elliptical cross-section with the left-right direction as its major axis. A pair of recessed grooves 22, 22 are formed in the inner body 18. The recessed grooves 22 open onto the inner circumferential surface of the inner body 18 and extend linearly in the axial direction. In this embodiment, one recessed groove 22 is provided on each side of the central hole 20 in the direction of its minor axis. An outer cylindrical member 14 is fitted onto the inner body 18. The outer cylindrical member 14 is formed of, for example, metal or synthetic resin, and its inner diameter is larger than the outer diameter of the inner body 18, while also being shorter in the axial direction than the inner body 18. A flange portion 23 protruding outward is formed at one axial end of the outer cylindrical member 14. The outer cylindrical member 14 only needs to be cylindrical overall; for example, it may be a C-shaped annular body divided in a part of the circumferential direction, or a segmented structure divided at multiple points in the circumferential direction. The outer cylindrical member 14 is positioned externally to the inner body 18, and a main rubber elastic body 16 is formed radially between the inner body 18 and the outer cylindrical member 14. The main rubber elastic body 16 is substantially cylindrical in shape overall. The inner circumferential surface of the main rubber elastic body 16 is vulcanized and bonded to the outer circumferential surface of the inner body 18, and the outer circumferential surface is vulcanized and bonded to the inner circumferential surface of the outer cylindrical member 14, thus forming an integrally vulcanized molded product comprising the inner body 18 and the outer cylindrical member 14. A groove 24 extending in an annular shape in the circumferential direction is formed on the axial end face of the main rubber elastic body 16. A pair of grooves 26, 26 penetrating in the axial direction are formed on both the upper and lower sides of the main rubber elastic body 16 relative to the inner body 18. The grooves 26 extend substantially in the left-right direction, with both left and right ends reaching beyond the inner body 18 in the left-right direction. Between the pair of cut holes 26, 26 in the main rubber elastic body 16, a pair of rubber arms 28, 28 are formed, extending in the left-right directio