CN-116006576-B - Thrust bearing device and macpherson suspension for vehicle

CN116006576BCN 116006576 BCN116006576 BCN 116006576BCN-116006576-B

Abstract

The invention provides a thrust bearing device which can reliably maintain the axial direction of a spring supporting component and a lower side shell, and the contact surface of the lower side shell made of synthetic resin and the spring supporting component made of steel is not worn. The upper spring seat (14) is composed of steel and has a cylindrical portion (14A) and a disk-shaped portion (14B), and the cylindrical portion (14A) has an engagement hole (B) penetrating in the radial direction in the upper portion thereof. The lower housing (3) of the thrust bearing (1) has a cylindrical body (17) along the upper inner peripheral surface of the cylindrical portion (14A), and the cylindrical body (17) has an engagement protrusion (D) on the outer peripheral surface (17A) thereof, which engages with the engagement hole (B). When the engagement protrusion (D) engages with the engagement hole (B), the relative movement between the upper spring seat (14) and the lower housing (3) in the axial direction (J) and the circumferential direction (E) is restricted.

Inventors

SHIBATA KOHEI
Zaki Yasuhiro
FUKATA SHOGO

Assignees

中西金属工业株式会社

Dates

Publication Date: 20260508
Application Date: 20221018
Priority Date: 20211022

Claims (4)

1. A thrust bearing device, comprising: Thrust bearing, and An upper spring seat which is a spring support member for supporting an upper end of the coil spring, The thrust bearing device is characterized in that, The thrust bearing includes: an upper case and a lower case; An upper side rail wheel held by the upper side housing; A lower side rail wheel held by the lower side housing, and Rolling elements rolling between the upper side rail wheel and the lower side rail wheel, The upper case and the lower case are mainly made of synthetic resin, The upper spring seat is mainly made of steel, The upper spring seat has a cylindrical portion and a disk-like portion, and the cylindrical portion has an engagement hole penetrating in a radial direction or an engagement recess recessed in an inner peripheral surface at an upper portion thereof, The lower case has a cylindrical body along an upper inner peripheral surface of the cylindrical portion, and the cylindrical body has an engaging convex portion on an outer peripheral surface thereof, the engaging convex portion engaging with the engaging hole or the engaging concave portion, The engaging hole and the engaging convex portion, or the engaging concave portion and the engaging convex portion are provided at one or more positions in the circumferential direction, Instead of utilizing the friction force generated by the elastic deformation force of the lower side housing by a structure that the lower side housing is in contact with the upper side spring seat in an elastically deformed state, the relative movement of the upper side spring seat and the lower side housing is reduced, The engagement convex portion is engaged with the engagement hole or the engagement concave portion, so that the relative movement between the upper spring seat and the lower housing in the axial direction and the circumferential direction is restricted, and the upper spring seat and the lower housing do not slide in the circumferential direction.
2. A thrust bearing device as claimed in claim 1, wherein, The upper surface of the engaging convex portion of the lower case is a substantially horizontal surface or a side surface of a cylinder extending in a substantially horizontal direction, The lower surface of the engaging protrusion is an inclined surface having a diameter decreasing downward.
3. A thrust bearing device, comprising: Thrust bearing, and An upper spring seat which is a spring support member for supporting an upper end of the coil spring, The thrust bearing device is characterized in that, The thrust bearing includes: an upper case and a lower case; An upper side rail wheel held by the upper side housing; A lower side rail wheel held by the lower side housing, and Rolling elements rolling between the upper side rail wheel and the lower side rail wheel, The upper case and the lower case are mainly made of synthetic resin, The upper spring seat is mainly made of steel, The upper spring seat has a cylindrical portion and a disk-like portion, the cylindrical portion has an engaging convex portion protruding radially inward at an upper portion thereof, The lower case has a cylindrical body along an upper inner peripheral surface of the cylindrical portion, and the cylindrical body has an engagement hole penetrating in a radial direction to be engaged with the engagement convex portion or an engagement concave portion recessed in an outer peripheral surface to be engaged with the engagement convex portion, The engaging convex portion and the engaging hole, or the engaging convex portion and the engaging concave portion are provided at one or more positions in the circumferential direction, Instead of utilizing the friction force generated by the elastic deformation force of the lower side housing by a structure that the lower side housing is in contact with the upper side spring seat in an elastically deformed state, the relative movement of the upper side spring seat and the lower side housing is reduced, The engagement convex portion is engaged with the engagement hole or the engagement concave portion, so that the relative movement between the upper spring seat and the lower housing in the axial direction and the circumferential direction is restricted, and the upper spring seat and the lower housing do not slide in the circumferential direction.
4. A Macpherson suspension for a vehicle, characterized in that, A thrust bearing device according to any one of claims 1 to 3.

Description

Thrust bearing device and macpherson suspension for vehicle Technical Field The present invention relates to a thrust bearing device for a macpherson suspension of a vehicle. Background As a suspension that supports a wheel with respect to a vehicle body by a coil spring and is provided with a damper for absorbing up-and-down vibration, there is a macpherson suspension (strut) that is formed by fixing a column (support rod) in which the damper is built to an axle. Macpherson suspensions are widely used mainly for front wheels of passenger cars. As a thrust bearing (thrust bearing) device for an upper portion of a macpherson suspension, there is a thrust bearing device in which an upper end of a coil spring (for example, coil spring 2 of patent document 1 and coil spring 17 of patent document 2) is supported by a spring support member (for example, bottom holder 7 of patent document 1 and bottom cup 16 of patent document 2) and a synthetic resin lower case of a thrust bearing (for example, bottom cover 5 of patent document 1 and bottom cap 15 of patent document 2) are held in an axial direction (for example, refer to patent documents 1 and 2). In patent document 1, the resin member is brought into contact with the metal member in an elastically deformed state, whereby the axial direction is held by a friction force generated by an elastic deformation force. That is, the reed 15 provided on the axial surface 11c of the synthetic resin body 11 of the bottom cover 5 is brought into contact with the inner peripheral surface of the axial portion 17a of the steel support rod 17 of the bottom holder 7 (fig. 1 to 2). Or the flange 20 provided on the inner peripheral surface of the axial portion 17a is brought into contact with the axial surface 11c of the body 11 (fig. 3 to 4). In patent document 2, the synthetic resin bottom cap 15 is provided with a plurality of hooks 15f extending downward in the axial direction, thereby holding the synthetic resin bottom cap in the axial direction. That is, the end 15g of the hook 15f interferes with the small diameter free end of the radial direction portion 16c of the steel base cup 16, and therefore the base cap 15 and the base cup 16 are fastened in the axial direction (fig. 1-2, fig. 5-6). Prior art literature: patent document 1 specification of U.S. Pat. No. 8,496,383 Patent document 2 specification of U.S. Pat. No. 6,814,496 Disclosure of Invention Technical problem to be solved by the invention In the method of patent document 1 in which the spring support member and the lower case are held in the axial direction, the pressing force between the bottom holder 7 and the bottom cover 5 is reduced due to the influence of aging (creep) of the resin member with time. Thereby, there is a possibility that the separation preventing ability between the bottom holder 7 and the bottom cover plate 5 is reduced and vanished. In the method of patent document 2 in which the spring support member and the lower case are held in the axial direction, the relative movement between the bottom cap 15 and the bottom cup 16 in the circumferential direction is not restricted, and therefore the bottom cap 15 and the bottom cup 16 slide in the circumferential direction. Thereby, the contact surface of the synthetic resin base cap 15 with the steel base cup 16 is worn. The invention aims to provide a thrust bearing device capable of reliably holding a spring support member and a lower side shell in the axial direction. The present invention also provides a thrust bearing device in which the contact surface of the synthetic resin lower case with the steel spring support member is not worn. Technical proposal for solving the technical problems In order to solve the above-mentioned problems, a thrust bearing device according to the present invention includes: A thrust bearing, and an upper spring seat which is a spring supporting member for supporting an upper end of the coil spring, Wherein the thrust bearing comprises: an upper case and a lower case; An upper side rail wheel held by the upper side housing; A lower side rail wheel held by the lower side housing, and Rolling elements rolling between the upper side rail wheel and the lower side rail wheel, The upper case and the lower case are mainly made of synthetic resin, The upper spring seat is mainly made of steel, The upper spring seat has a cylindrical portion and a disk-like portion, and the cylindrical portion has an engagement hole penetrating in a radial direction or an engagement recess recessed in an inner peripheral surface at an upper portion thereof, The lower case has a cylindrical body along an upper inner peripheral surface of the cylindrical portion, and the cylindrical body has an engaging convex portion on an outer peripheral surface thereof, the engaging convex portion engaging with the engaging hole or the engaging concave portion, In a state where the engagement convex portion is engaged with the engagement hole or the engageme