CN112128297A

CN112128297A - Hydraulic bushing

Info

Publication number: CN112128297A
Application number: CN202010901679.7A
Authority: CN
Inventors: 陈志宁; 陈守义; 邓聚才; 周上奎; 刘庆全; 曾超翔
Original assignee: Liuzhou Risun Automobile Shock Absorption Technology Co ltd; Dongfeng Liuzhou Motor Co Ltd
Current assignee: Liuzhou Risun Automobile Shock Absorption Technology Co ltd; Dongfeng Liuzhou Motor Co Ltd
Priority date: 2020-09-01
Filing date: 2020-09-01
Publication date: 2020-12-25
Anticipated expiration: 2040-09-01
Also published as: CN112128297B

Abstract

The invention relates to the technical field of manufacturing of vibration reduction bushings and discloses a hydraulic bushing which comprises an outer gluing piece and an inner gluing piece. The outer rubber body is glued on the inner wall of the outer tube. Interior veneer piece includes well pipe, inner tube and interior rubber body, and the inner tube is worn to establish in well pipe, sets up relative last through-hole and the lower through-hole that sets up on the pipe wall of well pipe, and interior rubber body veneer is equipped with upper groove and low groove between well pipe and inner tube on the interior rubber body, and during the opening of upper groove extended to the through-hole, the opening of low groove extended to down in the through-hole. The inner cementing part is embedded in the outer cementing part, the upper groove and the inner wall of the outer cementing part enclose to form an upper cavity, the lower groove and the inner wall of the outer cementing part enclose to form a lower cavity, the upper cavity is communicated with the lower cavity, and sealing liquid is filled in the upper cavity and the lower cavity. The hydraulic bushing provided by the invention is simple in structure, easy to produce, capable of realizing a damping function and providing good vibration reduction and isolation effects.

Description

Hydraulic bushing

Technical Field

The invention relates to the technical field of automobile manufacturing, in particular to a hydraulic bushing.

Background

In vehicle suspension design, a flexible connection such as a rubber bushing is generally adopted to meet the requirements of vibration reduction and noise reduction of a vehicle and obtain the required suspension kinematics. However, the existing rubber bushing is not only poor in damping effect and can meet the requirements only by being matched with a power cylinder, but also lacks in damping function, and needs to be provided with damping by adding a damper.

Therefore, a new hydraulic bushing is needed to solve the above problems.

Disclosure of Invention

The invention aims to provide a hydraulic bushing which is simple in structure, easy to produce, capable of achieving a damping function and providing good vibration reduction and vibration isolation effects.

In order to achieve the purpose, the invention adopts the following technical scheme:

a hydraulic bushing, comprising:

the outer rubber body is glued on the inner wall of the outer pipe;

the inner rubber body is glued between the middle pipe and the inner pipe, an upper groove and a lower groove are arranged on the inner rubber body, an opening of the upper groove extends into the upper through hole, and an opening of the lower groove extends into the lower through hole;

interior cementing member inlays the dress and is in the outer cementing member, just the upper groove with the inner wall of outer cementing member encloses to close and forms the cavity, the lower groove with the inner wall of outer cementing member encloses to close and forms cavity down, go up the cavity with cavity intercommunication down, go up the cavity with all be equipped with the sealing liquid in the cavity down.

As a preferable scheme of the hydraulic bushing, a first groove and a second groove are arranged on the outer wall of the middle pipe, the first groove and the inner wall of the outer gluing piece are enclosed to form a first flow channel, the second groove and the inner wall of the outer gluing piece are enclosed to form a second flow channel, the first side of the upper cavity and the first side of the lower cavity are communicated through the first flow channel, and the second side of the upper cavity and the second side of the lower cavity are communicated through the second flow channel.

As a preferable scheme of the hydraulic bushing, an upper release groove and a lower release groove are formed in the inner rubber body, the upper release groove is located above the inner pipe, and the lower release groove is located below the inner pipe.

Preferably, the upper relief groove and the lower relief groove each penetrate the inner rubber body in an axial direction of the inner pipe.

Preferably, the hydraulic bushing has an upper relief groove and a lower relief groove that are curved in a plane perpendicular to the axis of the inner tube.

As the preferred scheme of hydraulic pressure bush, the feed liquor hole has been seted up on the outer closure, the feed liquor hole with cavity or go up the cavity intercommunication down, the hydraulic pressure bush still includes the sealing, the sealing can the shutoff the feed liquor hole.

As the preferred scheme of hydraulic pressure bush, be provided with on the outer tube and seal the plane, the feed liquor hole is located seal on the plane, the sealing member can with seal the plane laminating.

As a preferable scheme of the hydraulic bushing, the sealing member is a blind rivet.

Preferably, the depth of the lower chamber is greater than the depth of the upper chamber.

Preferably, the hydraulic bushing is configured such that the axis of the inner tube is located above the axis of the outer tube.

Compared with the prior art, the hydraulic bushing provided by the invention has the beneficial effects that:

according to the hydraulic bushing provided by the invention, the outer rubber body is glued on the inner wall of the outer pipe, so that the outer gluing part is formed, the inner rubber body is glued between the middle pipe and the inner pipe, so that the inner pipe, the inner rubber body and the middle pipe are fixedly connected together to form the inner gluing part, then the inner gluing part is embedded in the outer gluing part to form an upper chamber and a lower chamber which are mutually communicated, after preloading, the lower chamber is in a compressed state, when vibrating, the elastic lower sealing liquid of the inner rubber body can reciprocate between the upper chamber and the lower chamber to form resistance, and the corresponding damping and lag angle are generated, so that the damping effect is achieved. The hydraulic bushing provided by the invention is simple in structure, easy to produce, capable of realizing a damping function and providing good vibration reduction and isolation effects.

Drawings

FIG. 1 is a schematic view of a hydraulic bushing provided by an embodiment of the present invention at a first angle;

FIG. 2 is a schematic view of a hydraulic bushing provided by an embodiment of the present invention at a second angle;

FIG. 3 is a cross-sectional view taken at A-A of FIG. 2;

FIG. 4 is a cross-sectional view of an inner glue element provided by an embodiment of the invention;

FIG. 5 is a cross-sectional view taken at B-B of FIG. 2;

FIG. 6 is a cross-sectional view of a hydraulic bushing in a direction perpendicular to the axis provided by an embodiment of the present invention;

FIG. 7 is a cross-sectional view of an outer composite member provided by an embodiment of the present invention.

In the figure:

100-an upper chamber; 200-a lower chamber;

1-outer glue joint part; 11-an outer tube; 111-sealing plane; 12-an outer rubber body; 13-liquid inlet hole;

2-inner gluing part; 21-middle tube; 211 — a first recess; 212-a second groove; 213-a first flow channel; 214-a second flow channel; 22-an inner tube; 23-an inner rubber body; 231-upper groove; 232-lower groove; 233-upper release groove; 234-lower relief groove;

3-sealing piece.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 4, the present embodiment provides a hydraulic bushing including an outer adhesive member 1 and an inner adhesive member 2. Wherein, outer cemented piece 1 includes outer tube 11 and outer rubber body 12, and outer rubber body 12 glues on the inner wall of outer tube 11. Interior veneer 2 includes well pipe 21, inner tube 22 and interior rubber body 23, and inner tube 22 wears to establish in well pipe 21, sets up relative last through-hole and the lower through-hole that sets up on well pipe 21's the pipe wall, and interior rubber body 23 veneer is between well pipe 21 and inner tube 22, is equipped with upper groove 231 and low groove 232 on the interior rubber body 23, and during the opening of upper groove 231 extended to the through-hole, the opening of low groove 232 extended to the through-hole down. Interior plywood part 2 inlays the dress in outer plywood part 1, and the inner wall of upper groove 231 and outer plywood part 1 encloses and closes and form upper plenum 100, and lower groove 232 encloses and closes with the inner wall of outer plywood part 1 and form lower plenum 200, and upper plenum 100 communicates with lower plenum 200, all is equipped with in upper plenum 100 and the lower plenum 200 and seals the liquid.

In the hydraulic bushing provided by the embodiment, the outer rubber body 12 is glued on the inner wall of the outer pipe 11, so that the outer gluing part 1 is formed, the inner rubber body 23 is glued between the middle pipe 21 and the inner pipe 22, so that the inner pipe 22, the inner rubber body 23 and the middle pipe 21 are fixedly connected together and the inner gluing part 2 is formed, then the inner gluing part 2 is embedded in the outer gluing part 1, so that an upper chamber 100 and a lower chamber 200 which are communicated with each other are formed, after preloading, the lower chamber 200 is in a compressed state, and when vibrating, the sealing liquid under the elasticity of the inner rubber body 23 can reciprocate in the upper chamber 100 and the lower chamber 200 to form resistance, and corresponding damping and lag angle are generated. The hydraulic bushing provided by the embodiment has the advantages of simple structure, easiness in production, capability of realizing a damping function and good vibration reduction and isolation effects.

In this embodiment, the sealing liquid is silicone oil. Compared with glycol sealing liquid, the silicone oil is more beneficial to improving damping and lag angle.

The embodiment provides the compression bushing, and the optimal matching is realized by multi-target optimization of the structures (including the length, the section, the contour and the like), the sealing liquid formula and the viscosity of the upper chamber 100 and the lower chamber 200, so that better damping and vibration attenuation effects are obtained.

The damping of the hydraulic bushing provided by the embodiment is larger than 5N S/mm, the lag angle is larger than 30 degrees, and the damping of the common rubber bushing is smaller than 2N S/mm, and the lag angle is smaller than 15 degrees, so that the damping and vibration isolation effect of the hydraulic bushing provided by the embodiment is better. The damping of the hydraulic bushing provided by the embodiment can reach 8N × s/mm at most, and the lag angle can reach 35 degrees at most.

Specifically, outer cemented piece 1 and interior cemented piece 2 are connected through riveting the mode soon, and interior cemented piece 2 pressure equipment is in outer cemented piece 1 to the weeping is prevented.

The outer glued piece 1 and the inner glued piece 2 are vulcanized by adopting a special vulcanization mold, and the vulcanization surface roughness is required to be ensured.

As shown in fig. 3 and 4, the depth of the lower chamber 200 is greater than the depth of the upper chamber 100. Since the damping is large when vibrating downward, the depth of the lower chamber 200 needs to be deepened to meet the design damping value.

Further, the axis of the inner tube 22 is located above the axis of the outer tube 11. When the hydraulic bushing is mounted on the cab suspension arm, the inner tube 22 will move downwards under the weight of the cab, and in order to ensure that the axis of the inner tube 22 is aligned with the axis of the outer tube 11 after mounting, the axis of the inner tube 22 needs to be raised when designing the hydraulic bushing.

Preferably, the distance between the axis of the inner tube 22 and the axis of the outer tube 11 is 10mm + -0.2 mm, i.e., the preload displacement of the inner tube 22 is 10mm + -0.2 mm. Further, the ratio of the preload displacement of the inner tube 22 to the outer diameter of the inner tube 22 is greater than 0.25. In the present embodiment, the outer diameter of the inner tube 22 is 26mm, and the ratio of the amount of preload displacement of the inner tube 22 to the outer diameter of the inner tube 22 is approximately 0.38.

As shown in fig. 5 and 6, the outer wall of the middle tube 21 is provided with a first groove 211 and a second groove 212, the first groove 211 and the inner wall of the outer adhesive member 1 enclose to form a first flow channel 213, the second groove 212 and the inner wall of the outer adhesive member 1 enclose to form a second flow channel 214, the first side of the upper chamber 100 and the first side of the lower chamber 200 are communicated through the first flow channel 213, and the second side of the upper chamber 100 and the second side of the lower chamber 200 are communicated through the second flow channel 214. That is, the first flow channel 213 and the second flow channel 214 allow the sealing liquid to move back and forth between the upper chamber 100 and the lower chamber 200, thereby generating resistance and generating corresponding damping and retardation angles.

As shown in fig. 1-4 and 6, the inner rubber 23 is provided with an upper release groove 233 and a lower release groove 234, the upper release groove 233 is located above the inner tube 22, and the lower release groove 234 is located below the inner tube 22. By providing the upper release groove 233 and the lower release groove 234, the inner rubber 23 is prevented from being excessively pulled during the large vertical movement of the inner tube 22, so that the inner rubber 23 has a good fatigue property, and the amplitude of the inner tube 22 is increased. The hydraulic bushing provided by the embodiment can meet the requirements of at least 50 ten thousand times on the preload of 10mm, the amplitude of +/-7.5 mm and the frequency of 4.75Hz and has better fatigue property under larger amplitude.

Further, the upper relief groove 233 and the lower relief groove 234 penetrate through the inner rubber body 23 along the axial direction of the inner tube 22, so as to ensure that the inner tube 22 has a large movement amplitude in the whole axial direction, and the inner rubber body 23 has good fatigue characteristics in the whole axial direction.

As shown in fig. 2 and 6, the upper relief groove 233 and the lower relief groove 234 are each arc-shaped in a plane perpendicular to the axis of the inner tube 22 in order to secure a certain length of the upper relief groove 233 and the lower relief groove 234 in the plane while preventing interference with the upper chamber 100 and the lower chamber 200.

As shown in fig. 2, the relief groove 233 corresponds to an angle a of 105-115 in a plane perpendicular to the axis of the inner tube 22. The lower relief groove 234 corresponds to an angle beta of 155 deg. -165 deg. in a plane perpendicular to the axis of the inner tube 22. Preferably, α is 110 °. Preferably, β is 160 °.

As shown in FIG. 4, the maximum distance A between the bottom wall of the upper groove 231 and the upper wall of the upper relief groove 233 is 5mm to 7 mm. The maximum distance B between the bottom wall of the lower groove 232 to the lower wall of the lower relief groove 234 is 5mm to 7 mm. Preferably, the maximum distance A between the bottom wall of the upper groove 231 and the upper wall of the upper relief groove 233 is 6 mm. The maximum distance B between the bottom wall of the lower groove 232 to the lower wall of the lower relief groove 234 is 6 mm.

Further, as shown in fig. 6, the width of both ends of the upper relief groove 233 is greater than the width of the middle portion of the upper relief groove 233 in a plane perpendicular to the axis of the inner tube 22. The width of the lower relief groove 234 at both ends is greater than the width of the middle of the lower relief groove 234 in a plane perpendicular to the axis of the inner tube 22.

Further, as shown in fig. 6, the length of the upper relief groove 233 is greater than the length of the lower relief groove 234 in a plane perpendicular to the axis of the inner tube 22.

Further, as shown in FIG. 6, the angle between the edge of the end of the upper chamber 100 and the edge of the end of the lower chamber 200 in a plane perpendicular to the axis of the inner tube 22 is 75-85. I.e., in a plane perpendicular to the axis of the inner tube 22, the first flow passage 213 corresponds to an angle of 75-85 deg., and the second flow passage 214 corresponds to an angle of 75-85 deg..

Preferably, the angle between the edge of the end of the upper chamber 100 and the edge of the end of the lower chamber 200 is 80 °.

Further, the angle between the first side edge and the second side edge of the upper chamber 100 in a plane perpendicular to the axis of the inner tube 22 is 100 °. The angle between the first side edge and the second side edge of the lower chamber 200 in a plane perpendicular to the axis of the inner tube 22 is 100.

As shown in fig. 6-7 in combination with fig. 1, the outer adhesive member 1 is provided with a liquid inlet hole 13, the liquid inlet hole 13 is communicated with the lower chamber 200 or the upper chamber 100, the hydraulic bushing further includes a sealing member 3, and the sealing member 3 can seal the liquid inlet hole 13. The upper chamber 100 and the lower chamber 200 can be filled with sealing liquid through the liquid inlet hole 13, and after the sealing liquid is filled, the liquid inlet hole 13 is sealed by the sealing member 3, so that the sealing performance of the upper chamber 100 and the lower chamber 200 is ensured.

In order to ensure that the filling amount of the sealing liquid meets the quality requirement, before the upper chamber 100 and the lower chamber 200 are filled with the sealing liquid, the upper chamber 100 and the lower chamber 200 need to be vacuumized. In the present embodiment, the filling amount of the sealing liquid is greater than or equal to 95% of the total volume of the upper chamber 100, the lower chamber 200, the first flow channel 213 and the second flow channel 214.

Further, a sealing plane 111 is arranged on the outer tube 11, the liquid inlet hole 13 is located on the sealing plane 111, and the sealing member 3 can be attached to the sealing plane 111, so as to ensure the sealing property between the sealing member 3 and the outer appearance 11.

Specifically, in the present embodiment, the sealing member 3 is a blind rivet. The riveting edge sealing is adopted, and the pressing force is more than 5000N.

Further, after the blind rivet is used, a sealing glue solution is coated between the blind rivet and the sealing plane 111, namely, the sealing glue solution is used for further sealing and leakage prevention.

The hydraulic bushing provided by the embodiment can ensure no leakage when the axial force is greater than 3000N and no leakage when the radial force is greater than 5400N.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A hydraulic bushing, comprising:

the outer gluing part (1) comprises an outer pipe (11) and an outer rubber body (12), wherein the outer rubber body (12) is glued on the inner wall of the outer pipe (11);

the inner rubber part (2) comprises a middle pipe (21), an inner pipe (22) and an inner rubber body (23), wherein the inner pipe (22) penetrates through the middle pipe (21), the pipe wall of the middle pipe (21) is provided with an upper through hole and a lower through hole which are oppositely arranged, the inner rubber body (23) is glued between the middle pipe (21) and the inner pipe (22), the inner rubber body (23) is provided with an upper groove (231) and a lower groove (232), the opening of the upper groove (231) extends into the upper through hole, and the opening of the lower groove (232) extends into the lower through hole;

interior veneer piece (2) inlay and adorn in outer veneer piece (1), just upper groove (231) with the inner wall of outer veneer piece (1) encloses and closes and form upper chamber (100), lower groove (232) with the inner wall of outer veneer piece (1) encloses and closes and form lower chamber (200), upper chamber (100) with lower chamber (200) intercommunication, upper chamber (100) with all be equipped with in lower chamber (200) and seal liquid.

2. The hydraulic bushing of claim 1, wherein a first groove (211) and a second groove (212) are disposed on an outer wall of the middle pipe (21), the first groove (211) and an inner wall of the outer adhesive member (1) enclose to form a first flow channel (213), the second groove (212) and an inner wall of the outer adhesive member (1) enclose to form a second flow channel (214), a first side of the upper chamber (100) and a first side of the lower chamber (200) are communicated through the first flow channel (213), and a second side of the upper chamber (100) and a second side of the lower chamber (200) are communicated through the second flow channel (214).

3. The hydraulic bushing according to claim 1, wherein the inner rubber body (23) is provided with an upper relief groove (233) and a lower relief groove (234), the upper relief groove (233) is located above the inner tube (22), and the lower relief groove (234) is located below the inner tube (22).

4. The hydraulic bushing according to claim 3, wherein the upper relief groove (233) and the lower relief groove (234) each penetrate the inner rubber body (23) in an axial direction of the inner tube (22).

5. The hydraulic bushing of claim 3 wherein the upper relief groove (233) and the lower relief groove (234) are each arcuate in a plane perpendicular to the axis of the inner tube (22).

6. The hydraulic bushing according to claim 1, wherein the outer closing member (1) has a liquid inlet hole (13) formed therein, the liquid inlet hole (13) being in communication with the lower chamber (200) or the upper chamber (100), the hydraulic bushing further comprising a sealing member (3), the sealing member (3) being capable of sealing the liquid inlet hole (13).

7. The hydraulic bushing according to claim 6, characterized in that a sealing plane (111) is provided on the outer tube (11), the inlet orifice (13) being located on the sealing plane (111), the seal (3) being able to abut against the sealing plane (111).

8. Hydraulic bushing according to claim 6, wherein the closure (3) is a blind rivet.

9. The hydraulic bushing of claim 1, wherein the depth of the lower chamber (200) is greater than the depth of the upper chamber (100).

10. The hydraulic bushing according to claim 1, characterized in that the axis of the inner tube (22) is located above the axis of the outer tube (11).