CN113294481A

CN113294481A - Hydraulic bushing

Info

Publication number: CN113294481A
Application number: CN202110702867.1A
Authority: CN
Inventors: 黄橙; 莫尔曼·克莱门斯; 周晓光; 李晓武
Original assignee: Boge Elastmetall Shanghai Co Ltd
Current assignee: Bogo Rubber Plastic Wuxi Co ltd
Priority date: 2021-06-24
Filing date: 2021-06-24
Publication date: 2021-08-24

Abstract

The invention discloses a hydraulic bushing, which comprises an inner framework, an inner cage, a rubber main spring, an outer sleeve, a flow channel and two rubber stop blocks, wherein the inner framework, the rubber main spring and the inner cage are coaxially arranged from inside to outside in sequence, and the inner framework, the inner cage and the rubber main spring are vulcanized and bonded together to form a vulcanized part; the outer sleeve is sleeved outside the vulcanized part; two inner framework limiting blocks protruding outwards are arranged on the outer side wall of the inner framework from top to bottom, and a rubber layer is coated outside each inner framework limiting block; the rubber main spring forms two hydraulic chambers on the vulcanization piece; the flow channel is arranged at the windows of the two hydraulic chambers; the inside wall of runner is provided with the inside bellied runner stopper of round. The hydraulic bushing has an axial limiting function, and can effectively limit the maximum axial displacement of the bushing; and the hydraulic bushing with the same structure can meet more different performance requirements, can cover more vehicle types, can be used for sharing skeleton parts for multiple vehicle types, and can effectively reduce the development period and the cost.

Description

Hydraulic bushing

Technical Field

The invention relates to the field of vehicle chassis rubber bushings, in particular to a hydraulic bushing.

Background

The chassis bushing is an elastic element arranged in the vehicle chassis suspension system, mainly serving for connection and vibration damping. Traditional rubber metal bush is compared to the hydraulic pressure bush, has high damping characteristic in certain frequency range, can promote the damping performance of bush, improves the ride comfort and the travelling comfort of vehicle.

Control arm hydraulic bushings of the vehicle chassis are typically required to transmit a certain axial load. The axial rigidity of the hydraulic bushing with the traditional structure is low, so that the hydraulic bushing can generate large axial displacement under the working condition of large axial load. Large axial displacements can lead to large deformations and high stresses in the rubber part, resulting in poor durability of the bushing. Axial loading of the hydraulic bushing of the control arm is usually superimposed with loading such as radial force, torsion and the like. When large axial displacement is simultaneously superimposed on displacement in other directions, interference between internal parts may occur, resulting in deformation or damage of parts. The axial displacement of the bush is limited by the mode that rubber limit blocks are arranged at the two ends of the bush at present. This method requires hard stop interfaces at the axial ends of the bushing that can cover the rubber stops, which can be part of the frame or additional flanges or the like. However, this method is limited by the size of the bushing and the space for arranging the entire vehicle.

Different vehicle types can be covered under the same platform of the host factory, for example, cars, station wagons, SUVs, MPVs and the like exist on the same platform. The hydraulic bushings used for platform vehicle models generally have the same size and structure, but the performances of static rigidity, damping angle peak value, peak frequency and the like of the hydraulic bushings may be different for different vehicle models. If the performance adjustment range of the adopted hydraulic bushing is not large enough, different bushing structure forms are required to meet the requirements of different vehicle types.

The main engine plant also requires the supplier of the hydraulic bushings to be able to provide calibration samples with different properties for chassis calibration during the development phase. This also requires that the hydraulic bushing be configured to cover as wide a performance tuning space as possible.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a hydraulic bushing which can realize an axial limiting function and limit the maximum axial displacement of the bushing; and the hydraulic bushing with the same structure can meet more different performance requirements, can cover more vehicle types, can be used for sharing skeleton parts for multiple vehicle types, and can effectively reduce the development period and the cost.

The technical scheme for realizing the purpose is as follows: the utility model provides a hydraulic bushing, includes inner frame, interior cage, rubber main spring, outer tube, runner and two rubber dog, wherein:

the inner framework, the rubber main spring and the inner cage are coaxially arranged from inside to outside in sequence, and the inner framework, the inner cage and the rubber main spring are vulcanized and bonded together to form a vulcanized part; the outer sleeve is sleeved outside the vulcanized part;

two outwards-protruding inner framework limiting blocks are arranged on the outer side wall of the inner framework from top to bottom, and a rubber layer is coated outside each inner framework limiting block;

the rubber main spring forms two hydraulic chambers on a vulcanization piece, the two hydraulic chambers are positioned on two radial sides of the inner framework, and damping fluid is stored in the hydraulic chambers;

the flow channel is arranged at the windows of the two hydraulic chambers and is in contact with the outer sleeve;

a channel for damping fluid to flow is arranged on the contact surface of the flow channel and the outer sleeve and is communicated with the two hydraulic chambers;

a circle of inward-protruding runner limiting blocks are arranged on the inner side wall of the runner and located between the two inner framework limiting blocks; the runner limiting block is provided with two grooves which are distributed on two radial sides of the inner framework; a rubber stopper mounting hole is formed at the bottom of each groove;

the two rubber stoppers are pressed in the rubber stopper mounting holes of the two grooves in a one-to-one correspondence manner.

The hydraulic bushing is characterized in that each inner frame limiting block comprises two side wings, and the two side wings protrude outwards along the two radial sides of the inner frame in a one-to-one correspondence mode.

In the above hydraulic bushing, the upper and lower side surfaces of the two flanks of the inner frame limiting block are axial limiting action surfaces; the outer edges of the two flanks of the inner framework limiting block are radial limiting action surfaces.

The two flanks of the upper inner frame limiting block are located right above the two flanks of the lower inner frame limiting block in a one-to-one correspondence manner, and the two rubber stoppers are located between the two flanks of the two inner frame limiting blocks in a one-to-one correspondence manner.

The hydraulic bushing is characterized in that the inner framework limiting block is formed by wrapping an inner framework with plastic, or the inner framework limiting block is formed by casting aluminum or forging aluminum on the inner framework.

The hydraulic bushing can realize the axial limiting function and limit the maximum axial displacement of the bushing; and the hydraulic bushing with the same structure can meet more different performance requirements, can cover more vehicle types, can be used for sharing skeleton parts for multiple vehicle types, and can effectively reduce the development period and the cost.

Drawings

FIG. 1 is a vertical cross-sectional view of a hydraulic bushing of the present invention;

FIG. 2 is a transverse cross-sectional view of the hydraulic bushing of the present invention;

FIG. 3 is a block diagram of the inner frame of the hydraulic bushing of the present invention;

fig. 4 is a structural view of a flow passage of the hydraulic bushing of the present invention.

Detailed Description

In order that those skilled in the art will better understand the technical solution of the present invention, the following detailed description is given with reference to the accompanying drawings:

referring to fig. 1, 2, 3 and 4, in a preferred embodiment of the present invention, a hydraulic bushing includes an inner frame 1, an inner cage 2, a main rubber spring 3, an outer sleeve 4, a flow channel 5 and two rubber stoppers 6.

The inner frame 1, the rubber main spring 2 and the inner cage 2 are coaxially arranged from inside to outside in sequence, and the inner frame 1, the inner cage 2 and the rubber main spring 3 are vulcanized and bonded together to form a vulcanized part; the outer sleeve 4 is sleeved outside the vulcanized part; two outwards-protruding inner framework limiting blocks 7 are arranged on the outer side wall of the inner framework 1 from top to bottom, and a rubber layer is coated outside each inner framework limiting block 7; each inner frame limiting block 7 comprises two side wings 71, and the two side wings 71 are protruded outwards along the two radial sides of the inner frame 1 in a one-to-one correspondence manner. Two flanks of the upper inner framework limiting block are positioned right above two flanks of the lower inner framework limiting block in a one-to-one correspondence manner.

The upper and lower side surfaces of the two flanks 71 of the inner framework limiting block 7 are axial limiting action surfaces 72; the outer edges of the two flanks 71 of the inner frame limiting block 7 are radial limiting action surfaces 73. The inner framework limiting block 7 is formed by coating plastic on the inner framework, or the inner framework limiting block is formed by casting aluminum or forging aluminum on the inner framework.

The rubber main spring 2 forms two hydraulic chambers 8 on a vulcanized part, the two hydraulic chambers 8 are positioned at two radial sides of the inner framework 1, and damping fluid is stored in the hydraulic chambers 8; the flow channel 5 is arranged at the windows of the two hydraulic chambers 8, the flow channel 5 is positioned between the outer sleeve 4 and the vulcanizing piece, and the flow channel 5 is in contact with the outer sleeve 4; the contact surface of the flow passage 5 and the outer sleeve 4 is provided with a passage for the flow of damping fluid, and the passage is communicated with two hydraulic chambers 8.

A circle of inward-protruding runner limiting blocks 51 are arranged on the inner side wall of the runner 5, and the runner limiting blocks 51 are positioned between the two inner framework limiting blocks 7; the runner limiting block 51 is provided with two grooves 52, and the two grooves 52 are distributed on two radial sides of the inner framework 1; the bottom of each groove 52 is provided with a rubber stopper mounting hole 53; the two rubber stoppers 6 are press-fitted into the rubber stopper mounting holes 53 of the two grooves 52 one by one (see fig. 4). The two rubber stoppers 6 are positioned between the two flanks of the two inner frame limiting blocks 7 in a one-to-one correspondence.

The vulcanizing piece, the flow passage 5, the rubber stop 6, the damping liquid and the outer sleeve 4 are assembled together to form a hydraulic bushing assembly.

The two hydraulic chambers 8 of the hydraulic bushing are filled with damping fluid. The two hydraulic chambers 8 are connected by a flow passage 5. When the hydraulic bushing works, the hydraulic chamber on one side is squeezed, and damping fluid flows to the hydraulic chamber on the other side along the flow passage. The flow of the damping fluid in the flow passage enables the hydraulic bushing to have a higher damping lag angle at a specific frequency, thereby providing better damping performance.

The inner frame 1 is provided with two inner frame limiting blocks 7. The inner frame limiting block 7 simultaneously plays a role in axial and radial limiting.

Under the action of axial load, the inner framework 1 moves axially relative to the outer sleeve 4 and the flow channel 5, and when the displacement reaches the designed maximum value, the axial limiting action surface 72 of the inner framework limiting block 7 is in contact with the upper side surface and the lower side surface of the flow channel limiting block 51, so that the axial displacement of the whole hydraulic bushing is limited. The axial thickness and shape of the rubber layer coated outside the inner framework limiting block 7 are changed, and the degree of urgency of the change of the axial stiffness curve of the hydraulic bushing can be adjusted to meet the nonlinear performance requirements of different axial stiffnesses.

Under the action of radial load, the inner framework 1 moves along the radial direction relative to the outer sleeve 4 and the flow channel 5, and when the displacement reaches the designed maximum value, the radial limiting action surface 73 of the inner framework limiting block 7 is contacted with the flow channel 5 to play a role in limiting the radial displacement of the bushing. The rubber stopper 6 mounted on the runner 5 functions to make the radial rigidity smoothly transited. Under the action of radial load, when the inner framework 1 radially displaces relative to the outer sleeve 4 and the flow channel 5, the outer side of the inner framework 1 is firstly contacted with the rubber stop block 6, and the radial rigidity begins to slowly increase. When the radial load is further increased and the inner framework 1 continues to generate radial displacement, the radial limiting block on the inner framework 1 acts, the radial rigidity is rapidly increased, and the radial displacement is limited. The rubber stopper 6 can enable the transition of the radial rigidity curve of the whole hydraulic bushing from the linear section to the maximum load to be smoother, and the driving comfort of a vehicle is improved. By changing the shape, size and rubber hardness of the rubber stopper 6, the degree of change of the radial stiffness curve can be changed to meet different performance requirements.

The flow passage 5 of the hydraulic bushing is an independent sub-part and has a large design and adjustment space. The peak value of the damping lag angle and the frequency corresponding to the peak value of the hydraulic bushing can be adjusted by independently adjusting the section size, the length and the like of the flow passage 5 so as to meet different technical requirements. And the flow channel can be independently adjusted without changing a vulcanization piece, so that the performance adjustment is more flexible, and the development period can be shortened.

The hydraulic bushing has the following beneficial effects:

(1) the damping angle peak value is higher in a specific frequency range, so that better damping performance can be provided, and the driving comfort of the vehicle is improved;

(2) the axial limiting function is realized, the axial maximum displacement can be effectively limited, the internal interference is avoided, and the durability of the product is improved;

(3) the thickness and the shape of the rubber layer coated outside the inner framework limiting block 7 are changed, so that the degree of delay of different axial stiffness changes can be realized, and different axial stiffness nonlinear characteristics can be realized;

(4) the radial limiting function is realized, the radial limiting is divided into soft limiting and hard limiting, and the hard limiting is provided by a radial limiting action surface of the inner framework limiting block 7 and can effectively limit the maximum radial displacement; the soft limit is provided by the independent rubber stopper 6, so that the change of the radial stiffness curve can be more gradual;

(5) the size, the shape and the rubber hardness of the independent rubber stopper 6 are changed, so that different radial stiffness curve change slow and fast degrees can be realized, and different radial stiffness nonlinear characteristics can be realized. Meanwhile, the two rubber stoppers 6 can be designed into different sizes, shapes and hardness according to requirements so as to meet different performance requirements of the vehicle during braking and acceleration;

(6) the independent flow channel structure can obtain different damping angle peak values and frequencies corresponding to the peak values by independently adjusting the sizes of the flow channels, and the performance adjustment is flexible and efficient.

In conclusion, the hydraulic bushing has an axial limiting function, and can effectively limit the maximum axial displacement of the bushing; and the nonlinear characteristic of the static stiffness curve of the product, the damping angle peak value frequency and other parameters have larger adjustment space. The hydraulic bushing with the same structure can meet more and different performance requirements and can cover more vehicle types. The multi-vehicle type shares the framework part, can effectively reduce the development period and the cost, and the characteristic is also suitable for the requirements of the host factory on the sample piece adjustment with different performance requirements in the development stage.

It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.

Claims

1. The utility model provides a hydraulic bushing which characterized in that, includes inner frame, interior cage, rubber main spring, outer tube, runner and two rubber dog, wherein:

2. The hydraulic bushing of claim 1, wherein each of the inner frame stoppers includes two side wings, and the two side wings protrude outward along two radial sides of the inner frame in a one-to-one correspondence.

3. The hydraulic bushing of claim 2, wherein the upper and lower side surfaces of the two side wings of the inner frame limiting block are axial limiting acting surfaces; the outer edges of the two flanks of the inner framework limiting block are radial limiting action surfaces.

4. The hydraulic bushing of claim 2, wherein the two side wings of the upper inner frame stopper are located directly above the two side wings of the lower inner frame stopper in a one-to-one correspondence, and the two rubber stoppers are located between the two side wings of the two inner frame stoppers in a one-to-one correspondence.

5. The hydraulic bushing of claim 1, wherein the inner frame limiting block is formed by coating the inner frame with plastic, or the inner frame limiting block is formed by casting or forging aluminum with the inner frame.