Control arm hydraulic bushing with decoupling film and automobile control arm assembly
By introducing a decoupling membrane structure and optimizing the flow channel design in the hydraulic bushing, the problem of poor vibration damping effect of the hydraulic control arm bushing under high-frequency vibration was solved, achieving low dynamic stiffness vibration isolation performance under large amplitude and high-frequency vibration, thus improving ride comfort.
Patent Information
- Application Number
- CN202211596166.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-12-12
- Publication Date
- 2026-05-15
- Estimated Expiration
- 2042-12-12
AI Technical Summary
Existing hydraulic control arm bushings have poor vibration damping performance under high-frequency vibration, affecting vibration isolation performance, and it is difficult to improve the structure in small installation spaces.
A decoupling membrane structure is introduced into the hydraulic bushing. The hydraulic cavity is separated by the flow channel plate, and the decoupling membrane is covered at the flow channel hole. The fluid flows through the decoupling membrane under high frequency vibration. The decoupling membrane is installed in combination with the cover plate and the protrusion, and the flow channel design is optimized to achieve low dynamic stiffness.
It can effectively attenuate vibrations under large amplitude and high frequency vibrations, improve ride comfort, solve the problem of poor shock absorption effect under high frequency vibration, and achieve good vibration isolation performance in a limited space.
Smart Images
Figure CN115853952B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of automotive parts, and in particular to a hydraulic bushing for a control arm with a decoupling membrane and an automotive control arm assembly. Background Technology
[0002] As a crucial structural component of the automotive chassis suspension, the control arm plays a guiding, supporting, and force-transmitting role, significantly impacting the ride comfort and handling stability of the vehicle. Early bushings used in control arms were made of pure rubber, which could not provide sufficient damping to attenuate front wheel shimmy during swaying. Relevant prior art, such as Chinese patent application "A Control Arm Assembly" (application number: CN201120270268.9), describes a control arm assembly comprising a control arm body and a bushing. One end of the control arm body is inserted into the bushing, with an interference fit between the inserted end and the bushing. The inner wall of the bushing is coated with a shock-absorbing material layer, which is a vulcanized rubber layer.
[0003] Subsequent industry development has also led to the use of hydraulic bushings in control arm bushings for damping. Hydraulic bushings encapsulate a portion of liquid within the rubber, serving the same purpose as rubber bushings, primarily at the connection points. A relevant prior art example is the Chinese patent application "A Radial Control Arm Rubber Hydraulic Bushing," application (patent) number: CN201320034940.3, which includes: an outer aluminum component, a bushing, and a flow channel. The outer aluminum component has a ring structure and covers the periphery of the bushing. The bushing, from the inside out, consists of: an inner tube, a rubber body, and an outer ring. The flow channel is located between the inner tube and the outer ring, and the flow channel is a radial flow channel structure. Through this method, the present invention enables the damping peak of the hydraulic bushing to reach over 60°, greatly enhancing the vibration reduction and noise reduction effect and improving the NVH characteristics of the suspension system. Ordinary hydraulic control arm bushings can provide large damping to attenuate front wheel sway and brake vibration when the front wheels swing, but at high frequencies, they generate high dynamic stiffness, resulting in high acoustic roughness and affecting vibration isolation performance.
[0004] Conventional hydraulic control arm bushings can provide significant damping to attenuate front wheel sway and brake vibration during front wheel oscillation. However, at high frequencies, they generate high dynamic stiffness and high acoustic roughness, affecting vibration isolation performance. The inventors of this application intend to further improve the control arm assembly to adjust its vibration isolation performance at high frequencies. However, the operating environment of the control arm differs from that of structures such as engine mounts, and its installation space is limited, meaning that the bushing connected to the control arm is relatively small. Therefore, further structural improvements to the smaller bushing are quite difficult. Summary of the Invention
[0005] The technical problem to be solved by this application is to provide a hydraulic bushing for a control arm with a decoupling membrane and an automotive control arm assembly, by adding a decoupling structure so that the hydraulic bushing has the performance of damping large amplitude vibration and low dynamic stiffness of high frequency vibration.
[0006] The technical solution adopted in this application is as follows: a hydraulic bushing for a control arm with a decoupling membrane, comprising an outer tube, a main spring, a flow channel plate, a decoupling membrane, and a cover plate. There are two symmetrically arranged hydraulic cavities between the middle of the main spring and the inner wall of the outer tube. An arc-shaped strip-shaped flow channel plate is installed in the hydraulic cavity. At least one channel is opened on the outer wall of the flow channel plate. A flow channel hole is opened on the channel, which connects the inner and outer sides of the flow channel plate. The decoupling membrane is installed on the inner wall of the flow channel plate through the cover plate, and the decoupling membrane covers the flow channel hole.
[0007] Compared with existing technologies, the advantages of this application lie in the arrangement of two hydraulic cavities between the main spring and the outer tube, which absorb external vibrations under large amplitude and improve ride comfort. This application further incorporates flow channel plates within the hydraulic cavities, dividing the originally monolithic hydraulic cavities. Due to the structural limitations of the outer tube and main spring, the hydraulic cavities in this application are arc-shaped segments; therefore, the arc-shaped flow channel plates effectively divide the hydraulic cavities. This application provides flow channel holes on the inner and outer sides of the flow channel plates, with decoupling membranes covering these holes, allowing fluid in the middle to flow through the decoupling membrane and then on both sides of the flow channel plate. Specifically, under small amplitude, high frequency conditions, the fluid flows through the decoupling membrane, solving the problem of poor vibration damping performance of the hydraulic bushing under high-frequency dynamics. This application adds a decoupling structure to the hydraulic bushing, enabling it to simultaneously dampen large amplitude vibrations and reduce low dynamic stiffness during high-frequency vibrations.
[0008] In some embodiments of this application, the inner wall of the flow channel plate is provided with a mounting groove, and the decoupling membrane is embedded in the mounting groove. The mounting groove corresponds to the flow channel hole, so the decoupling membrane installed in the flow channel plate covers the flow channel hole. This application solves the problem in cases where the space in the hydraulic bushing is too small to arrange the decoupling membrane, by taking an alternative approach.
[0009] The hydraulic bushing structure of this application, through optimized design, achieves a hydraulic bushing structure design with a decoupling diaphragm within a very small size range, enabling the bushing to possess both the characteristics of damping large-amplitude vibrations and low dynamic stiffness during high-frequency vibrations. The bushing of this application can provide large damping to attenuate front wheel shimmy (around 5-20Hz) during large-amplitude swings, and can also provide low dynamic stiffness at high frequencies to ensure good vibration isolation performance.
[0010] In some embodiments of this application, the structure of the cover plate is adapted to the inner wall structure of the flow channel plate, the cover plate is attached to the inner wall of the flow channel plate, and the cover plate has several through holes corresponding to the decoupling membrane. That is, the fluid located between the flow channel plate and the main spring will sequentially pass through the through holes on the cover plate, the decoupling membrane, and the flow channel holes to reach the channel of the flow channel plate.
[0011] Specifically, the inner wall surface of the flow channel plate is provided with a plurality of protrusions, and the cover plate is provided with mounting holes corresponding to the protrusions. The cover plate is installed on the inner wall surface of the flow channel plate through the mounting holes and the protrusions. In this application, the decoupling membrane is installed through the cover plate.
[0012] In some embodiments of this application, the flow channel plate is provided with a first channel and a second channel, the first channel passing through both ends of the flow channel plate and connecting the two hydraulic cavities.
[0013] The second channel connects one end of the flow channel plate to its bottom surface, thus linking the two hydraulic chambers. The unique flow channel plate structure fully utilizes the shock absorption effect of the inertial channel.
[0014] In some embodiments of this application, the two ends of the flow channel plate are connected to the main spring, and gaps exist between the top surface, bottom surface, inner wall surface, and outer wall surface of the flow channel plate and the main spring or outer tube. That is, the fluid in the hydraulic cavity fills the outer periphery of the flow channel plate. Moreover, the fluid located between the flow channel plate and the main spring can not only pass through the flow channel plate through the decoupling membrane, but also flow through the flow channel plate through the gaps at the top and bottom surfaces.
[0015] In this application, for ease of description, the axial direction of the hydraulic bushing is defined as the up-down direction.
[0016] In some embodiments of this application, the main spring includes an inner core, an inner skeleton, and a rubber component, wherein the inner core, inner skeleton, and rubber component are integrally vulcanized.
[0017] The rubber component includes a top component with a circular ring structure, a bottom component, and a middle component with a circular tube structure. The middle component connects the top component and the bottom component. Plate-shaped components extend from both sides of the middle component and connect the outer peripheral surfaces of the top component, the bottom component, and the middle component.
[0018] Specifically, the two ends of the flow channel plate are connected to the plate-shaped member.
[0019] The inner core is a cylindrical structure, and the inner skeleton includes two rings arranged vertically and two connecting strips connecting the two rings, with the two connecting strips located on opposite sides of the rings. In this application, the structure of the inner skeleton effectively supports the entire rubber component.
[0020] Based on common knowledge in the field, the above-described embodiments can be combined arbitrarily.
[0021] An automotive control arm assembly includes a control arm and a hydraulic bushing. One end of the control arm is connected to the hydraulic bushing via a fastener. The fastener passes through the hydraulic bushing along its axial direction and is locked to the hydraulic bushing by a locking member. Attached Figure Description
[0022] The present application will be described in further detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present application. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.
[0023] Figure 1 This is a schematic diagram of the structure of the hydraulic bushing of this application;
[0024] Figure 2 This is a schematic diagram of the transverse cross-section of the hydraulic bushing of this application;
[0025] Figure 3 This is a top view of the hydraulic bushing of this application;
[0026] Figure 4 For this application Figure 3 Sectional view of section BB;
[0027] Figure 5 This is a schematic diagram of the internal structure of the hydraulic bushing of this application;
[0028] Figure 6 This is an exploded structural diagram of the hydraulic bushing of this application;
[0029] Figure 7 This is a schematic diagram of the control arm assembly of this application;
[0030] Figure 8 This is a cross-sectional structural diagram of the control arm assembly of this application.
[0031] The specific explanations of the reference numerals in the attached drawings are as follows: 1. Outer tube; 2. Main spring; 21. Inner core; 22. Inner skeleton; 23. Rubber part; 23a. Top component; 23b. Bottom component; 23c. Middle component; 23d. Plate-shaped component; 3. Flow channel plate; 4. Decoupling membrane; 5. Cover plate; 6. Hydraulic cavity; 8. Flow channel hole; 9. Mounting groove; 10. Through hole; 11. First channel; 12. Second channel;
[0032] 31. Control arm; 32. Fastener; 33. Locking component. Detailed Implementation
[0033] The present application will now be described in detail with reference to the accompanying drawings.
[0034] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.
[0035] A hydraulic bushing with a decoupling membrane, such as Figures 1 to 6 As shown, the system includes an outer tube 1, a main spring 2, a flow channel plate 3, a decoupling membrane 4, and a cover plate 5. Two symmetrically arranged hydraulic cavities 6 exist between the middle of the main spring 2 and the inner wall of the outer tube 1. An arc-shaped flow channel plate 3 is installed within each hydraulic cavity 6. The arrangement of two hydraulic cavities 6 between the main spring 2 and the outer tube 1 absorbs external vibrations under large amplitude conditions, improving passenger comfort. This application further incorporates a flow channel plate 3 within the hydraulic cavities, separating the originally monolithic hydraulic cavity 6. In this application, due to the structural constraints of the outer tube 1 and the main spring 2, the hydraulic cavity 6 is an arc-shaped segment; therefore, the arc-shaped flow channel plate 3 effectively separates the hydraulic cavity 6.
[0036] The outer wall of the flow channel plate 3 has at least one channel, and the channel has flow channel holes 8. The flow channel holes 8 connect the inner and outer sides of the flow channel plate 3. The decoupling membrane 4 is installed on the inner wall of the flow channel plate 3 through a cover plate 5, and the decoupling membrane 4 covers the flow channel holes 8. This allows the fluid in the middle to flow through the decoupling membrane 4 and then flow on both sides of the flow channel plate 3, solving the problem of poor vibration damping effect of hydraulic suspension under high-frequency dynamic conditions. This application adds a decoupling structure to the hydraulic bushing, enabling the hydraulic bushing to have both the performance of damping large amplitude vibrations and low dynamic stiffness of high-frequency vibrations.
[0037] The inner wall of the flow channel plate 3 is provided with an installation groove 9, and the decoupling membrane 4 is embedded in the installation groove 9. The installation groove 9 corresponds to the flow channel hole 8, so the decoupling membrane 4 installed in the flow channel plate 3 covers the flow channel hole 8. This application solves the problem in cases where the space of the hydraulic bushing is too small to arrange the decoupling membrane 4, by taking an alternative approach.
[0038] The structure of the cover plate 5 is adapted to the inner wall structure of the flow channel plate 3. The cover plate 5 is attached to the inner wall of the flow channel plate 3, and several through holes 10 are opened on the cover plate 5 corresponding to the decoupling membrane 4. That is, the fluid located between the flow channel plate 3 and the main spring 2 will pass through the through holes 10 on the cover plate 5, the decoupling membrane 4, and the flow channel holes 8 in sequence to reach the channel of the flow channel plate 3.
[0039] Specifically, the inner wall surface of the flow channel plate 3 is provided with a plurality of protrusions, and the cover plate 5 is provided with mounting holes corresponding to the protrusions. The cover plate 5 is installed on the inner wall surface of the flow channel plate 3 through the mounting holes and the protrusions. In this application, the decoupling membrane 4 is installed through the cover plate 5.
[0040] The flow channel plate 3 is provided with a first channel 11 and a second channel 12. The first channel 11 passes through both ends of the flow channel plate 3 and connects the two hydraulic cavities 6.
[0041] The second channel 12 connects one end of the flow channel plate 3 to the bottom surface of the flow channel plate 3, and the second channel 12 connects the two hydraulic chambers 6. The unique structure of the flow channel plate 3 can fully utilize the shock absorption effect of the inertial channel.
[0042] The two ends of the flow channel plate 3 are connected to the main spring 2. Gaps exist between the top, bottom, inner, and outer walls of the flow channel plate 3 and the main spring 2 or outer tube 1. This means that the fluid in the hydraulic cavity 6 fills the outer periphery of the flow channel plate 3. Furthermore, the fluid located between the flow channel plate 3 and the main spring 2 can not only pass through the decoupling membrane 4 through the flow channel plate 3, but also flow through the gaps at the top and bottom surfaces of the flow channel plate 3.
[0043] The main spring 2 includes an inner core 21, an inner skeleton 22, and a rubber component 23, which are integrally vulcanized.
[0044] The rubber component 23 includes a ring-shaped top component 23a, a bottom component 23b, and a tubular middle component 23c. The middle component 23c connects the top component and the bottom component 23b. Plate-shaped components 23d extend from both sides of the middle component 23c, and the plate-shaped components 23d connect part of the outer peripheral surfaces of the top component, the bottom component 23b, and the middle component 23c. Specifically, both ends of the flow channel plate 3 are connected to the plate-shaped components 23d.
[0045] The inner core 21 is a cylindrical structure, and the inner skeleton 22 includes two rings arranged vertically and two connecting strips connecting the two rings, with the two connecting strips located on both sides of the rings. In this application, the structure of the inner skeleton 22 effectively supports the structure of the entire rubber part 23.
[0046] In this application, for ease of description, the axial direction of the hydraulic bushing is defined as the up-down direction.
[0047] A type of automotive control arm assembly, such as Figure 7 , Figure 8As shown, it includes a control arm 31 and the hydraulic bushing. One end of the control arm 31 is connected to the hydraulic bushing via a fastener 32. The fastener 32 passes through the hydraulic bushing along its axial direction and is locked to the hydraulic bushing by a locking member 33.
[0048] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The descriptions of the embodiments above are only for the purpose of helping to understand the present application and its core ideas. It should be noted that those skilled in the art can make several improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.
Claims
1. A hydraulic bushing for a control arm with a decoupling membrane, characterized in that... The system includes an outer tube (1), a main spring (2), a flow channel plate (3), a decoupling membrane (4), and a cover plate (5). Two symmetrically arranged hydraulic cavities (6) exist between the middle of the main spring (2) and the inner wall of the outer tube (1). An arc-shaped flow channel plate (3) is installed within each hydraulic cavity (6). At least one channel is formed on the outer wall of the flow channel plate (3), and a flow channel hole (8) is formed on the channel, connecting the inner and outer sides of the flow channel plate (3). The decoupling membrane (4) is installed on the inner wall of the flow channel plate (3) via the cover plate (5). (4) Covering the flow channel hole (8); The inner wall surface of the flow channel plate (3) is provided with an installation groove (9), and the decoupling membrane (4) is embedded in the installation groove (9); The structure of the cover plate (5) is adapted to the structure of the inner wall surface of the flow channel plate (3), the cover plate (5) is attached to the inner wall surface of the flow channel plate (3), and the cover plate (5) is provided with several through holes (10) corresponding to the decoupling membrane (4); Several protrusions are provided on the inner wall surface of the flow channel plate (3), and the cover plate (5) is provided with installation holes corresponding to the protrusions. The cover plate (5) is installed on the inner wall surface of the flow channel plate (3) through the installation holes and protrusions.
2. The hydraulic bushing for a control arm with a decoupling membrane according to claim 1, characterized in that... The flow channel plate (3) is provided with a first channel (11) and a second channel (12). The first channel (11) passes through both ends of the flow channel plate (3) and connects the two hydraulic cavities (6). The second channel (12) connects one end of the flow channel plate (3) to the bottom surface of the flow channel plate (3) and connects the two hydraulic cavities (6).
3. A hydraulic bushing for a control arm with a decoupling membrane according to claim 1, characterized in that... The two ends of the flow channel plate (3) are connected to the main spring (2), and there are gaps between the top surface, bottom surface, inner wall surface and outer wall surface of the flow channel plate (3) and the main spring (2) or the outer tube (1).
4. A hydraulic bushing for a control arm with a decoupling membrane according to claim 1, characterized in that... The main spring (2) includes an inner core (21), an inner skeleton (22) and a rubber part (23), which are integrally vulcanized.
5. A hydraulic bushing for a control arm with a decoupling membrane according to claim 4, characterized in that... The rubber component (23) includes a top component (23a) and a bottom component (23b) with a circular ring structure, and a middle component (23c) with a circular tube shape. The middle component (23c) connects the top component and the bottom component (23b). Plate-shaped components (23d) extend from both sides of the middle component (23c). The plate-shaped components (23d) connect part of the outer peripheral surfaces of the top component, the bottom component (23b) and the middle component (23c). The two ends of the flow channel plate (3) are connected to the plate-shaped components (23d).
6. A hydraulic bushing for a control arm with a decoupling membrane according to claim 4, characterized in that... The inner core (21) is a cylindrical structure, and the inner skeleton (22) includes two rings arranged vertically and two connecting strips connecting the two rings, with the two connecting strips located on both sides of the rings respectively.
7. An automotive control arm assembly, characterized in that... Includes a control arm (31) and a hydraulic bushing as described in any one of claims 1-6, one end of the control arm (31) being connected to the hydraulic bushing via a fastener (32), the fastener (32) passing through the hydraulic bushing along its axial direction, and the fastener (32) being locked to the hydraulic bushing via a locking member (33).