Double-rubber compound hydraulic bushing

Abstract

The invention relates to the technical field of automobile parts, and discloses a double-rubber compound hydraulic bushing which comprises an inner core, a rubber main spring, an outer pipe and a runner plate, the rubber main spring comprises a first rubber part and two second rubber parts, the side face of the first rubber part is provided with a first hydraulic groove and a second hydraulic groove, and the first hydraulic groove and the second hydraulic groove are communicated with each other. One second rubber part is arranged in the first hydraulic groove, and the other second rubber part is arranged in the second hydraulic groove; the second rubber part is fixedly connected with the first rubber part, and a separation belt is arranged between the second rubber part and the first rubber part; when encountering severe working conditions such as extreme load or high-frequency impact, the runner plate and the high-rigidity second rubber part form rigid contact limiting, excessive displacement of the rubber main spring is limited through a cooperative limiting structure of the second rubber part and the [-shaped separation belt, tearing of the rubber main spring caused by local stress concentration is avoided, and the service life of the rubber main spring is prolonged. And the structural reliability of the product under a severe working condition is obviously improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive parts, and particularly to a double-compound hydraulic bushing. Background Art

[0002] In the suspension system of passenger cars, the hydraulic bushing is a key component connecting the lower control arm and the vehicle body, and its performance directly affects the comfort and reliability of the whole vehicle.

[0003] Chinese Utility Model Patent with Publication No. CN210949661U discloses a hydraulic bushing, which is characterized in that it includes a hydraulic main spring and a bushing outer tube sleeved inside and outside, the hydraulic main spring includes a bushing inner tube and a hydraulic cavity sleeved inside and outside, and the side of the bushing inner tube is provided with an outwardly convex tension spring part; an annular inner groove is provided in the middle of the outside of the hydraulic cavity, a partition plate is provided in the inner groove, partition blocks are provided at symmetrical positions of the inner groove with respect to the partition plate, and the ends of the partition plate and the partition blocks are arranged in cooperation with the inside of the bushing outer tube; the partition blocks and the partition plate divide the inner groove into an upper chamber and a lower chamber, and the lower chamber is filled with damping fluid; a communicating slide hole is provided between the upper chamber and the lower chamber, and a slide rod that is in clearance fit with the slide hole is provided in the slide hole.

[0004] The above-mentioned hydraulic bushing solves some defects existing in the prior art, but there are still some deficiencies in actual use. For example, its hydraulic main spring uses a single rubber material, and under low-frequency and large-amplitude working conditions, it cannot effectively attenuate vibrations, resulting in a decrease in the comfort of the whole vehicle. At the same time, the periphery of its tension spring part is connected to the hydraulic main spring. Under sharp turns or large impact loads, its limiting function depends on the deformation of the rubber itself, and it is easy to cause rubber tearing or permanent deformation due to local stress concentration, shortening the service life.

[0005] Therefore, we propose a double-compound hydraulic bushing. Summary of the Invention

[0006] The purpose of the present invention is to provide a double-compound hydraulic bushing, so as to solve or at least alleviate one or more of the above problems and other problems existing in the prior art.

[0007] To achieve the above purpose, the present invention provides the following technical solution: A double-compound hydraulic bushing, comprising:

[0008] An inner core, a rubber main spring and an outer tube, the inner core, the rubber main spring and the outer tube are coaxially distributed in sequence from inside to outside;

[0009] The rubber main spring includes a first rubber member and two second rubber members. First hydraulic grooves and second hydraulic grooves are respectively formed on the side surfaces of the first rubber member. One of the second rubber members is disposed in the first hydraulic groove, and the other second rubber member is disposed in the second hydraulic groove;

[0010] The second rubber member is fixedly connected to the first rubber member, and a separation band is arranged between the second rubber member and the first rubber member;

[0011] There are two flow channel plates. One of the flow channel plates is installed at the first hydraulic groove, and the area surrounded by this flow channel plate and the first hydraulic groove forms a first hydraulic chamber. The other flow channel plate is installed at the second hydraulic groove, and the area surrounded by this flow channel plate and the second hydraulic groove forms a second hydraulic chamber. The first hydraulic chamber and the second hydraulic chamber are connected and communicated through a hydraulic flow channel.

[0012] In a double-compound hydraulic bushing according to the present invention, optionally, the separation band is arranged in a C shape.

[0013] In a double-compound hydraulic bushing according to the present invention, optionally, the damping ratio of the first rubber member is ≤0.2, and the static compression stiffness is ≤15 N / mm.

[0014] In a double-compound hydraulic bushing according to the present invention, optionally, the Shore hardness of the second rubber member is ≥75A, and the static compression stiffness is ≥30 N / mm.

[0015] In a double-compound hydraulic bushing according to the present invention, optionally, first grooves and second grooves are formed on the outer side wall of the flow channel plate. The first groove is connected and communicated with the second groove. A connection hole is formed on the flow channel plate, and the connection hole is located inside the second groove. The width of the first groove is smaller than the width of the second groove, and the first groove and the second groove form the hydraulic flow channel.

[0016] In a double-compound hydraulic bushing according to the present invention, optionally, the second groove is arranged in a trumpet shape.

[0017] In a double-compound hydraulic bushing according to the present invention, optionally, an assembly groove is formed on the first rubber member. The splicing part of the two flow channel plates is located in the assembly groove, and the outer wall of the flow channel plate is in close contact with the inner wall of the outer tube.

[0018] In a double-compound hydraulic bushing according to the present invention, optionally, an isolation protrusion is formed on the first rubber member, and the isolation protrusion is in close contact with the inner wall of the outer tube.

[0019] In a double-compound hydraulic bushing according to the present invention, optionally, the flow channel plate is arranged in a C shape.

[0020] In a double-compound hydraulic bushing according to the present invention, optionally, it further includes a middle skeleton, the middle skeleton is integrally vulcanized and formed with the first rubber part, the middle skeleton is wrapped inside the first rubber part, and the first rubber part is integrally vulcanized and formed with the second rubber part.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] Under the working conditions of low frequency and large amplitude of the present invention, the first hydraulic chamber and the second hydraulic chamber are connected through a hydraulic flow channel composed of a first groove and a second groove, and the reciprocating flow of the hydraulic fluid in the flow channel stimulates a significant damping effect, which can efficiently absorb the vibration energy of the whole vehicle with low frequency and large amplitude;

[0023] When encountering extreme loads or harsh working conditions such as high-frequency impacts, the flow channel plate forms a rigid contact limit with the second rubber part with high stiffness. Through the cooperative limit structure of the second rubber part and the C-shaped separation belt, the excessive displacement of the rubber main spring is restricted, and the tearing of the rubber main spring caused by local stress concentration is avoided, significantly improving the structural reliability of the product under harsh working conditions. Description of the Drawings

[0024] Figure 1 is a schematic structural diagram of a double-compound hydraulic bushing of the present invention;

[0025] Figure 2 is an exploded structural diagram of a double-compound hydraulic bushing of the present invention;

[0026] Figure 3 is a schematic sectional structural diagram of a double-compound hydraulic bushing of the present invention;

[0027] Figure 4 is a schematic structural diagram of a rubber main spring in a double-compound hydraulic bushing of the present invention;

[0028] Figure 5 is a schematic structural diagram of the rubber main spring in a double-compound hydraulic bushing of the present invention from another perspective;

[0029] Figure 6 is a schematic partial structural diagram of a double-compound hydraulic bushing of the present invention;

[0030] Figure 7 is a schematic structural diagram of a flow channel plate in a double-compound hydraulic bushing of the present invention;

[0031] Figure 8 is a schematic structural diagram of two assembled flow channel plates in a double-compound hydraulic bushing of the present invention.

[0032] In the figure: 1. Inner core;

[0033] 2. Rubber main spring; 201. First rubber part; 2011. First hydraulic groove; 2012. Second hydraulic groove; 2013. Assembly groove; 2014. Isolation protrusion; 202. Second rubber part; 203. Separation band; 204. First hydraulic chamber; 205. Second hydraulic chamber;

[0034] 3. Runner plate; 301. Groove; 302. Second groove; 303. Connecting hole;

[0035] 4. Outer tube;

[0036] 5. Middle framework. Detailed implementation mode

[0037] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation modes.

[0038] Among them, the accompanying drawings are only for illustrative purposes, showing only schematic diagrams, rather than physical diagrams, and should not be construed as a limitation to this patent; in order to better illustrate the embodiments of the present invention, some components in the accompanying drawings will be omitted, enlarged or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted.

[0039] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if terms such as "upper", "lower", "left", "right", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and should not be construed as a limitation to this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0040] In the description of the present invention, unless otherwise clearly defined and limited, if terms such as "connection" are used to indicate the connection relationship between components, this term should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] Embodiment

[0042] Please refer to Figures 1 to 8 , this embodiment provides a double-compound hydraulic bushing, including: an inner core 1, a rubber main spring 2, an outer tube 4, and two flow channel plates 3. The inner core 1, the rubber main spring 2, and the outer tube 4 are coaxially distributed from inside to outside in sequence;

[0043] The rubber main spring 2 includes a first rubber part 201 and two second rubber parts 202. The first rubber part 201 is respectively provided with a first hydraulic groove 2011 and a second hydraulic groove 2012 on its side surface. One of the second rubber parts 202 is arranged in the first hydraulic groove 2011, and the other second rubber part 202 is arranged in the second hydraulic groove 2012;

[0044] The second rubber part 202 is fixedly connected to the first rubber part 201, and a separation belt 203 is arranged between the second rubber part 202 and the first rubber part 201;

[0045] One of the flow channel plates 3 is installed at the first hydraulic groove 2011, and the area surrounded by the flow channel plate 3 and the first hydraulic groove 2011 forms a first hydraulic chamber 204. The other flow channel plate 3 is installed at the second hydraulic groove 2012, and the area surrounded by the flow channel plate 3 and the second hydraulic groove 2012 forms a second hydraulic chamber 205. The first hydraulic chamber 204 and the second hydraulic chamber 205 are connected and communicated through a hydraulic flow channel.

[0046] In this embodiment, the inner core 1 serves as the core support component and is connected to the vehicle lower control arm; the rubber main spring 2 wraps the inner core 1 and realizes functional partitioning through the first rubber part 201 and the second rubber part 202. The first rubber part 201 is provided with the first hydraulic groove 2011 and the second hydraulic groove 2012, and the second rubber parts 202 are respectively embedded therein, forming a double-layer rubber structure.

[0047] The flow channel plates 3 are installed at the first hydraulic chamber 204 and the second hydraulic chamber 205, thereby jointly forming the first hydraulic chamber 204 and the second hydraulic chamber 205. The first hydraulic chamber 204 and the second hydraulic chamber 205 are connected and communicated through the hydraulic flow channels on the flow channel plates 3. The liquid flows through the hydraulic flow channels under the action of vibration, generating a damping effect.

[0048] The separation belt 203 is located between the first rubber part 201 and the second rubber part 202, physically isolating two rubber materials with different properties, which can not only provide a higher limiting effect and improve the reliability of the product, but also effectively avoid the tearing of the rubber main spring caused by local stress concentration.

[0049] Furthermore, the separation belt 203 is arranged in a C shape. In this embodiment, the C-shaped design of the separation belt 203 with the U-shaped opening facing outward can separate one side, the top, and the bottom of the second rubber part 202 from the first rubber part 201, so that the contact surfaces of the two rubbers are connected only through one surface, expanding the isolation area, reducing the interfacial shear stress under dynamic loads, and preventing rubber tearing caused by local stress concentration.

[0050] In this embodiment, the damping ratio of the first rubber part 201 ≤ 0.2, and the static compression stiffness ≤ 15 N / mm. The first rubber part 201 uses low-damping rubber, which has significant elastic deformation during low-frequency vibration, effectively absorbs high-frequency vibration energy, and reduces the acceleration transmitted to the vehicle body.

[0051] Furthermore, the Shore hardness of the second rubber part 202 ≥ 75A, and the static compression stiffness ≥ 30 N / mm. The second rubber part 202 uses high-hardness and high-wear-resistant materials. In the working conditions where the bushing is subjected to large lateral forces and large torsions, the flow channel plate 3 contacts and collides with the second rubber part 202, providing rigid limit, and avoiding permanent failure caused by excessive deformation of a single rubber in the prior art.

[0052] In this embodiment, a first groove 301 and a second groove 302 are formed on the outer side wall of the flow channel plate 3. The first groove 301 communicates with the second groove 302. A connection hole 303 is formed on the flow channel plate 3. The connection hole 303 is located inside the second groove 302. The width of the first groove 301 is smaller than that of the second groove 302. The first groove 301 and the second groove 302 form a hydraulic flow channel.

[0053] The first groove 301 is a narrow channel that restricts the liquid flow rate to generate high damping; the second groove 302 is a wide channel, and the connection hole 303 serves as the liquid inlet / outlet to balance the flow rate and pressure.

[0054] Furthermore, the second groove 302 is arranged in a horn shape. The horn-shaped second groove 302 expands the cross-sectional area at the connection hole 303, reduces the liquid flow resistance, avoids the generation of local eddy currents, and improves the response speed of the hydraulic system.

[0055] Furthermore, an assembly groove 2013 is formed on the first rubber part 201. The splicing part of the two flow channel plates 3 is located inside the assembly groove 2013. The outer wall of the flow channel plate 3 is in close contact with the inner wall of the outer tube 4. The assembly groove 2013 provides precise positioning for the flow channel plate 3 to ensure the continuity of the hydraulic flow channel after the two flow channel plates 3 are spliced; the close contact between the flow channel plate 3 and the outer tube 4 prevents liquid leakage and enhances the structural rigidity.

[0056] In this embodiment, an isolation protrusion 2014 is formed on the first rubber member 201. The isolation protrusion 2014 is in close contact with the inner wall of the outer tube 4. The isolation protrusion 2014 serves as a sealing structure, thereby preventing the hydraulic fluid from directly entering the second hydraulic chamber 205 from the first hydraulic chamber 204 without passing through the hydraulic channel, blocking the bypass flow of the liquid around the hydraulic flow path, and maintaining the stability of the damping characteristics.

[0057] In this embodiment, the flow channel plate 3 is arranged in a C shape. The C-shaped flow channel plate 3 fits the arc contour of the inner wall of the outer tube 4, reducing the assembly gap, and at the same time providing a larger contact area, enhancing the sealing performance and structural strength.

[0058] In this embodiment, it further includes a middle skeleton 5. The middle skeleton 5 is integrally vulcanized and formed with the first rubber member 201. The middle skeleton 5 is wrapped inside the first rubber member 201, and the first rubber member 201 is integrally vulcanized and formed with the second rubber member 202.

[0059] The middle skeleton 5, as a metal reinforcement, is vulcanized integrally with the first rubber member 201 to enhance the structural strength of the main spring; the integral vulcanization of the first rubber member 201 and the second rubber member 202 ensures the interfacial bonding force. The middle skeleton 5 can be made of lightweight aluminum alloy material.

[0060] In this embodiment, the first rubber member 201 is made of butyl rubber, which has a damping ratio of 0.18 and a static compression stiffness of 12 N / mm; the second rubber member 202 is made of hydrogenated nitrile rubber with a Shore hardness of 78A and a static compression stiffness of 35 N / mm; the hydraulic fluid uses silicon-based ISOVG32 with a viscosity index of 160.

[0061] Assemble the double-compound hydraulic bushing of the present invention to the front lower control arm of an SUV and test its performance under complex road conditions:

[0062] When passing over a speed bump at 30 km / h, the seat vibration acceleration decreases from 1.2 m / s 2 to 0.7 m / s 2 ;

[0063] The in-vehicle noise is reduced by 4 dB(A), reaching the NVH level of luxury cars.

[0064] Parts not involved in the present invention are the same as or can be implemented using the prior art. Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double rubber compound hydraulic bushing, characterized in that, Comprising: An inner core (1), a rubber main spring (2) and an outer tube (4), the inner core (1), the rubber main spring (2) and the outer tube (4) are coaxially distributed in sequence from inside to outside; The rubber main spring (2) includes a first rubber member (201) and a second rubber member (202), there are two second rubber members (202), first hydraulic grooves (2011) and second hydraulic grooves (2012) are respectively formed on the side surface of the first rubber member (201), one of the second rubber members (202) is arranged in the first hydraulic groove (2011), and the other second rubber member (202) is arranged in the second hydraulic groove (2012).

2. The double-binder composite hydraulic bushing according to claim 1, wherein: The second rubber member (202) is fixedly connected to the first rubber member (201), and a separation belt (203) is arranged between the second rubber member (202) and the first rubber member (201); It further includes a flow channel plate (3), there are two flow channel plates (3), one of the flow channel plates (3) is installed at the first hydraulic groove (2011), and the area surrounded by this flow channel plate (3) and the first hydraulic groove (2011) forms a first hydraulic chamber (204), the other flow channel plate (3) is installed at the second hydraulic groove (2012), and the area surrounded by this flow channel plate (3) and the second hydraulic groove (2012) forms a second hydraulic chamber (205), and the first hydraulic chamber (204) is communicated with the second hydraulic chamber (205) through a hydraulic flow channel.

3. The double-binder composite hydraulic bushing according to claim 2, characterized in that: The separation belt (203) is arranged in a U shape.

4. A double-bonding compound hydraulic bushing according to claim 1, wherein: The damping ratio of the first rubber member (201) ≤ 0.2, the static compression stiffness ≤ 15 N / mm, the Shore hardness of the second rubber member (202) ≥ 75A, and the static compression stiffness ≥ 30 N / mm.

5. The double-bonding compound hydraulic bushing according to claim 2, wherein: First grooves (301) and second grooves (302) are formed on the outer side wall of the flow channel plate (3), the first groove (301) is communicated with the second groove (302), a connecting hole (303) is formed on the flow channel plate (3), the connecting hole (303) is located inside the second groove (302), the width of the first groove (301) is smaller than the width of the second groove (302), and the first groove (301) and the second groove (302) form the hydraulic flow channel.

6. The double-binder composite hydraulic bushing according to claim 5, wherein: The second groove (302) is arranged in a trumpet shape.

7. A double-bonding compound hydraulic bushing according to claim 5, characterized in that: An assembly groove (2013) is formed on the first rubber member (201), the splicing part of the two flow channel plates (3) is located in the assembly groove (2013), and the outer wall of the flow channel plate (3) is in close contact with the inner wall of the outer tube (4).

8. A double-binder composite hydraulic bushing according to claim 5, characterized in that: An isolation protrusion (2014) is formed on the first rubber member (201), and the isolation protrusion (2014) is in close contact with the inner wall of the outer tube (4).

9. The double-binder composite hydraulic bushing according to claim 7, wherein: The flow channel plate (3) is arranged in a C shape.

10. The double-binder composite hydraulic bushing according to claim 1, characterized in that: It further includes a middle framework (5), the middle framework (5) is integrally vulcanized and formed with the first rubber part (201), the middle framework (5) is wrapped inside the first rubber part (201), and the first rubber part (201) is integrally vulcanized and formed with the second rubber part (202).

Images