CN-122014795-A - Hydraulic bushing and production process thereof

Abstract

The invention discloses a hydraulic bushing which sequentially comprises a main spring, a runner plate matched with the main spring and a bushing bracket from inside to outside, wherein the bushing bracket is in sealing connection with the main spring, liquid is filled between the bushing bracket and the main spring, and the main spring comprises an inner pipe, main spring rubber and a ball cage which are sequentially connected from inside to outside. The hydraulic bushing still has a reliable damping effect without the provision of an outer sleeve. Because the outer sleeve is canceled by the hydraulic bushing, the situation of local excessive extrusion or deformation of the outer sleeve can not occur, and the qualification rate of the hydraulic bushing is improved. But also saves the manufacturing cost of the hydraulic bushing by eliminating the outer sleeve.

Inventors

• ZHUANG HAISHI
• SHI XIANWU
• LI QINGYU

Assignees

• 芜湖达敖汽车智能底盘系统有限公司

Dates

Publication Date

20260512

Application Date

20260126

Claims (9)

1. 1. The hydraulic bushing is characterized by sequentially comprising a main spring (1), a runner plate (2) matched with the main spring (1) and a bushing bracket (3) from inside to outside, wherein the bushing bracket (3) is in sealing connection with the main spring (1), and liquid is filled between the bushing bracket (3) and the main spring (1); The main spring (1) comprises an inner tube (11), main spring rubber (12) and a ball cage (13) which are sequentially connected from inside to outside.
2. 2. A production process of a hydraulic bushing is characterized in that a main spring (1) is matched with a runner plate (2) and then is fixed with a bushing bracket (3) through a submerged filling machine in a pressing mode.
3. 3. A production process according to claim 2, characterized in that the main spring (1) is interference fitted with the bushing bracket (3).
4. 4. The production process according to claim 2, wherein the inner tube (11), the main spring rubber (12) and the ball cage (13) are vulcanized to obtain the main spring (1).
5. 5. The production process according to claim 2, characterized in that the bushing bracket (3) is produced by an extrusion process.
6. 6. The production process according to claim 5, characterized in that the bushing brackets (3) are provided with sealing rings (14) at both ends for sealing with the main spring (1), respectively.
7. 7. A production process according to claim 6, wherein the sealing ring (14) is provided as an integral structure with the bushing bracket (3), and the inner diameter of the sealing ring (14) becomes gradually smaller in a direction away from the bushing bracket (3).
8. 8. The production process according to claim 7, wherein the inner diameter of the bushing bracket (3) extruded is identical to the outer end diameter of the sealing ring (14).
9. 9. A production process according to claim 5, characterized in that the machining of the fitting surface (31) of the bushing bracket (3) ensures dimensional accuracy of the fitting surface.

Description

Hydraulic bushing and production process thereof Technical Field The invention relates to the field of production of hydraulic bushings, in particular to a hydraulic bushing and a production process thereof. Background The hydraulic bushing and bushing bracket sub-assembly is a key connecting component widely adopted in a modern automobile suspension system, and is mainly used for connecting an auxiliary frame and a control arm so as to attenuate vibration and impact transmitted to a vehicle body from a road surface, and riding comfort and control stability of the vehicle are improved through shielding frequency. The subassembly is typically comprised of an inner hydraulic bushing backbone and an outer metal bushing bracket, which are assembled together by an interference fit. At present, an assembly process of pressing a hydraulic bushing into a bushing bracket by a pressing machine is commonly adopted in the industry. The method comprises the specific processes of positioning a bushing bracket on a workbench of a hydraulic press-loading machine, placing a hydraulic bushing framework above a bushing bracket mounting hole, and applying axial pressure through a pressure head to enable the bushing to be embedded into an inner hole of the bracket under continuous mechanical pressure until reaching a preset mounting depth. Because the outer sleeve is of aluminum material, in the press fitting process, once the conditions of inaccurate pressure control or poor press fitting alignment occur, the outer sleeve of the bushing is extremely easy to cause local excessive extrusion or deformation, and the product rejection rate is higher. Disclosure of Invention The object of the present invention is to provide a hydraulic bushing which has a reliable damping effect without the provision of an outer sleeve anymore, and a process for its production. Because the outer sleeve is canceled by the hydraulic bushing, the situation of local excessive extrusion or deformation of the outer sleeve can not occur, and the qualification rate of the hydraulic bushing is improved. But also saves the manufacturing cost of the hydraulic bushing by eliminating the outer sleeve. In order to achieve the purpose, the invention provides a hydraulic bushing which sequentially comprises a main spring, a runner plate matched with the main spring and a bushing bracket from inside to outside, wherein the bushing bracket is in sealing connection with the main spring, and liquid is filled between the bushing bracket and the main spring; The main spring comprises an inner tube, main spring rubber and a ball cage which are sequentially connected from inside to outside. The invention also provides a production process of the hydraulic bushing, and the main spring is pressed and fixed with the bushing bracket through the submerged filling machine after being matched with the runner plate. Preferably, the main spring is in an interference fit with the bushing bracket. Preferably, the inner tube, the main spring rubber and the ball cage are vulcanized to obtain the main spring. Preferably, the bushing bracket is produced by an extrusion process. Preferably, sealing rings are respectively arranged at two ends of the bushing bracket and used for being matched with the main spring to realize sealing. Preferably, the seal ring and the bushing bracket are provided as an integral structure, and the inner diameter of the seal ring is gradually reduced in a direction away from the bushing bracket. Preferably, the bushing bracket has an extruded inner diameter that corresponds to the diameter of the outer end of the seal ring. Preferably, machining the fitting surface of the bushing bracket ensures dimensional accuracy of the fitting surface. According to the technical scheme, the outer sleeve of the bushing is omitted, the outer sleeve is not used for sealing liquid in the hydraulic bushing any more, the main spring and the bushing bracket are directly sealed, and the liquid is sealed between the bushing bracket and the main spring. In the hydraulic bushing, a main spring is a core elastic bearing and connecting part of the hydraulic bushing, and consists of an inner pipe, main spring rubber and a ball cage, wherein the inner pipe is directly pressed or connected to a frame or a control arm of a vehicle, an opening of a bushing bracket is connected to an auxiliary frame, the inner pipe is a main force input point and a static connecting piece, the main spring rubber is used for bearing and vibration isolation, and is used as an elastomer for bearing static load and dynamic vibration from the inner pipe, the main spring rubber is used for damping and isolating high-frequency and small-amplitude vibration, such as idle vibration of an engine, tiny unevenness of a road surface and the like, the ball cage is a forming framework, and a supporting framework is provided for the main spring rubber during vulcanization forming, so that the structural strength and the shap