Liquid seal suspension bushing and automobile

Abstract

The present invention provides a liquid-sealed suspension bushing and an automobile, belonging to the technical field of automobile accessories, comprising an inner tube, a plastic-coated part, a rubber body and an outer tube coaxially nested from the inside out; wherein, an axially extending liquid inlet hole is provided on the inner tube, and a radial hole connected to the liquid inlet hole is also provided on the inner tube; a liquid through hole concentric with the radial hole is provided on the plastic-coated part; a liquid storage cavity is provided on the outer wall of the rubber body, and a liquid outlet hole concentric with the liquid through hole is provided on the rubber body, and the liquid outlet hole is connected to the liquid storage cavity; the liquid inlet hole, the radial hole, the liquid through hole and the liquid outlet hole constitute a liquid flow channel, and the liquid is stored in the liquid storage cavity through the liquid flow channel; the outer tube seals the liquid storage cavity. The liquid-sealed suspension bushing provided by the present invention is provided with an axial liquid inlet hole on the inner tube, and radial liquid outlet holes are provided through the plastic-coated part and the rubber body, and the formed liquid flow channel is connected to the liquid storage cavity. The flowing liquid is formed in the liquid storage cavity, thereby reducing the dynamic stiffness of the product, improving the vibration reduction and noise reduction effect of the suspension assembly, and thus improving the NVH performance of the entire vehicle.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile accessories, and in particular relates to a liquid-sealed suspension bushing and an automobile. Background Art

[0002] Liquid-seal suspension bushings are mainly used in control arm bushings. When the car is running, they play the role of shock absorption and noise reduction, which can improve the NVH performance of the entire vehicle.

[0003] The current disadvantages of liquid seal suspension bushings are: (1) The inner tube is a special-shaped structure, formed by die-cast aluminum. However, due to the irregular shape of the product structure and inconsistent size and thickness, defects such as pores, shrinkage holes, and shrinkage are prone to occur after casting, which will lead to poor NVH (noise, vibration, and harshness) performance and affect the service life; (2) Due to the unreasonable design of the liquid seal flow channel, the dynamic stiffness increases and the NVH performance is poor. Summary of the Invention

[0004] The embodiments of the present invention provide a liquid-sealed suspension bushing and a vehicle, aiming to solve the problem of high dynamic stiffness of the liquid-sealed suspension bushing and poor NHV performance.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a liquid-seal suspension bushing, comprising: an inner tube, a plastic-coated part, a rubber body and an outer tube coaxially nested in sequence from the inside to the outside; wherein, the inner tube is provided with an axially extending liquid inlet hole, and the inner tube is also provided with a radial hole connected to the liquid inlet hole; the plastic-coated part is provided with a liquid through hole concentric with the radial hole; a liquid storage cavity is provided on the outer wall of the rubber body, and the rubber body is also provided with a liquid outlet hole concentric with the liquid through hole, and the liquid outlet hole is connected to the liquid storage cavity; the liquid inlet hole, the radial hole, the liquid through hole and the liquid outlet hole constitute a liquid flow channel, and the liquid is stored in the liquid storage cavity through the liquid flow channel; the outer tube seals the liquid storage cavity.

[0006] In combination with the first aspect, in a possible implementation, a plurality of the liquid storage cavities are evenly distributed along the circumference on the outer wall of the rubber body, and the liquid storage cavities are interconnected.

[0007] In combination with the first aspect, in one possible implementation, the device further includes a liquid sealing ring, wherein the liquid sealing ring is nested on the outer wall of the rubber body so that each of the liquid storage cavities forms an independent cavity, wherein the liquid sealing ring is provided with a communication hole corresponding to each of the liquid storage cavities;

[0008] Two liquid inlet holes are symmetrically provided on the inner tube; four liquid storage cavities are evenly distributed along the circumference on the outer wall of the rubber body, and one liquid inlet hole is directly connected to one liquid storage cavity; and the liquid storage cavities are connected through the connecting holes.

[0009] In combination with the first aspect, in a possible implementation, an S-shaped flow channel is provided on the outer wall of the liquid sealing ring, wherein the S-shaped flow channel connects two adjacent communicating holes, and the four communicating holes are staggered one above and one below along the axial direction of the liquid sealing ring.

[0010] In combination with the first aspect, in a possible implementation, a limiting groove is provided on the outer wall of the rubber body, and the liquid sealing ring is installed in the limiting groove.

[0011] In combination with the first aspect, in a possible implementation, it further includes an upper frame and a lower frame, wherein the upper frame and the lower frame are embedded in the rubber body and are symmetrically arranged at the two axial ends of the rubber body.

[0012] In combination with the first aspect, in a possible implementation, both the upper frame and the lower frame are provided with opposing wing plates, and the wing plates avoid the liquid storage cavity.

[0013] In combination with the first aspect, in a possible implementation, the inner tube is provided with an anti-slip protrusion protruding radially outward; the overmolded part is wrapped around the inner tube, and the inner wall of the overmolded part has an anti-slip groove adapted to the anti-slip protrusion, and the outer wall of the overmolded part has an annular cone protruding radially outward; the inner wall of the rubber body is provided with an annular groove adapted to the annular cone; the anti-slip protrusion is staggered with the liquid inlet, and the liquid outlet is arranged on the annular groove.

[0014] In combination with the first aspect, in a possible implementation, the anti-slip groove forms an axial protrusion on the outer wall of the overmolded part, and an axial groove wrapping the axial protrusion is provided on the inner wall of the rubber body; the radial length of the annular frustum protrusion is greater than the radial length of the axial protrusion.

[0015] Compared with the prior art, the liquid-seal suspension bushing provided by the present invention has the following beneficial effects: an axial liquid inlet hole is set on the inner tube, and a radial liquid outlet hole is set through the overmolded part and the rubber body. The formed liquid flow channel is connected to the liquid storage cavity. The flowing liquid is formed in the liquid storage cavity, which reduces the dynamic stiffness of the product, improves the vibration and noise reduction effect of the suspension assembly, and thus improves the NVH performance of the entire vehicle.

[0016] In a second aspect, an embodiment of the present invention further provides an automobile, comprising the liquid-sealed suspension bushing.

[0017] The automobile provided by the embodiment of the present invention adopts this liquid-sealed suspension bushing, which reduces the dynamic stiffness of the product, improves the vibration and noise reduction effect of the suspension assembly, and further improves the NVH performance of the entire vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the exploded structure of a liquid-sealed suspension bushing provided in an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of the three-dimensional structure of a liquid-sealed suspension bushing provided in an embodiment of the present invention;

[0020] Figure 3 A schematic top view of the structure of a liquid-sealed suspension bushing provided in an embodiment of the present invention;

[0021] Figure 4 For the Figure 3 Cross-sectional structural diagram along line AA;

[0022] Figure 5 This is a schematic diagram of the exploded structure of the liquid-sealed suspension bushing used in an embodiment of the present invention without the outer tube;

[0023] Figure 6 for Figure 5 A schematic diagram of the three-dimensional structure of the liquid seal suspension bushing is provided;

[0024] Figure 7 A schematic diagram of the three-dimensional structure of a rubber body provided in an embodiment of the present invention;

[0025] Figure 8 A schematic diagram of a top view of a rubber body provided in an embodiment of the present invention;

[0026] Figure 9 For the Figure 8 Cross-sectional structural diagram along line BB;

[0027] Figure 10 A schematic diagram of the main structure of a molded part provided in an embodiment of the present invention;

[0028] Figure 11 A schematic diagram of the three-dimensional structure of a molded part provided in an embodiment of the present invention;

[0029] Figure 12 A schematic diagram of the three-dimensional structure of an inner tube provided in an embodiment of the present invention;

[0030] Description of reference numerals:

[0031] 1. Inner tube; 11. Anti-slip protrusion; 12. Radial hole; 13. Liquid inlet hole; 14. Steel ball; 2. Plastic-coated part; 21. Anti-slip groove; 22. Axial protrusion; 23. Annular cone; 24. Liquid passage hole; 3. Rubber body; 31. Liquid storage chamber; 32. Liquid outlet hole; 33. Limiting groove; 34. Axial groove; 35. Annular groove; 4. Liquid sealing ring; 41. Connecting hole; 42. S-shaped flow channel; 5. Upper frame; 51. Wing plate; 6. Lower frame; 7. Outer tube. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] Please also refer to Figures 1 to 12 The liquid-sealed suspension bushing provided by the present invention is now described. The liquid-sealed suspension bushing comprises an inner tube 1, an overmolded component 2, a rubber body 3, and an outer tube 7, which are coaxially nested from the inside out. The inner tube 1 is provided with an axially extending liquid inlet 13 and a radial hole 12 communicating with the liquid inlet 13. The overmolded component 2 is provided with a liquid passage 24 concentric with the radial hole 12. The rubber body 3 is provided with a liquid storage cavity 31 on its outer wall and a liquid outlet 32 ​​concentric with the liquid passage 24, communicating with the liquid storage cavity 31. The liquid inlet 13, radial hole 12, liquid passage 24, and liquid outlet 32 ​​form a liquid flow channel, through which liquid is stored in the liquid storage cavity 31. The outer tube 7 seals the liquid storage cavity 31.

[0034] Compared with the prior art, the liquid-sealed suspension bushing provided by the present invention has the following beneficial effects: an axial liquid inlet hole 13 is provided on the inner tube 1, and a radial liquid outlet hole 32 is provided through the overmolded part 2 and the rubber body 3. The formed liquid flow channel is connected to the liquid storage chamber 31. The flowing liquid is formed in the liquid storage chamber 31, thereby reducing the dynamic stiffness of the product, improving the vibration reduction and noise reduction effect of the suspension assembly, and thereby improving the NVH performance of the entire vehicle.

[0035] A steel ball 14 is provided on the liquid inlet 13 for blocking.

[0036] In some embodiments, see Figures 1 to 5 The outer wall of the rubber body 3 is evenly distributed with multiple liquid storage cavities 31 along the circumference, and the liquid storage cavities 31 are interconnected. By evenly disposing multiple liquid storage cavities 31 on the outer wall of the rubber body 3, the liquid flows in response to the vibration of the vehicle body, reducing the dynamic stiffness of the bushing. The dynamic liquid in the bushing changes with the excitation force, thereby improving the vibration isolation and noise reduction effect of the suspension bushing.

[0037] The liquid seal suspension bushing provided by the present invention is shown in FIG. Figures 1 to 9As shown, it also includes a liquid sealing ring 4, which is nested on the outer wall of the rubber body 3, so that each liquid storage cavity 31 forms an independent cavity, wherein a connecting hole 41 is provided on the liquid sealing ring 4 corresponding to each liquid storage cavity 31; two liquid inlet holes 13 are symmetrically provided on the inner tube 1; four liquid storage cavities 31 are evenly distributed along the circumference of the outer wall of the rubber body 3, and one liquid inlet hole 13 is directly connected to one liquid storage cavity 31; and each liquid storage cavity 31 is connected through a connecting hole 41. The liquid sealing ring 4 is used to seal each liquid storage cavity 31, and two liquid inlet holes 13 are provided to connect the two symmetrical liquid storage cavities 31. The four liquid storage cavities 31 constitute four working chambers, which can shorten the time for the liquid to flow in the liquid flow channel, enable the liquid to quickly adjust according to the vibration of the vehicle body, reduce the dynamic stiffness, increase the damping angle, and enhance the vibration isolation and noise reduction effect.

[0038] In some embodiments, see Figures 5 to 9 As shown, an S-shaped flow channel 42 is provided on the outer wall of the liquid sealing ring 4, wherein the S-shaped flow channel 42 connects two adjacent connecting holes 41, and the four connecting holes 41 are staggered one above and one below along the axial direction of the liquid sealing ring 4. The S-shaped flow channel 42 relies on the outer tube 7 to form a seal. The flow order of the liquid is the liquid inlet hole 13, the radial hole 12, the liquid hole 24, the liquid outlet hole 32 to the directly connected liquid storage cavity 31, and the liquid in the liquid storage cavity 31 enters an adjacent liquid storage cavity 31 through the connecting hole 41, the S-shaped flow channel 42, and the connecting hole 41. Through the circumferentially extending S-shaped flow channel 42, the liquid flow time can be effectively shortened, the dynamic hardening problem can be reduced, and the NVH performance can be improved.

[0039] In order to limit the axial position of the liquid sealing ring 4 and prevent the liquid sealing ring 4 from being misplaced in the axial direction and causing leakage of the liquid in the liquid storage chamber 31, a limiting groove 33 is provided on the outer wall of the rubber body 3 in this embodiment, and the liquid sealing ring 4 is installed in the limiting groove 33.

[0040] The liquid sealing ring 4 is of split type, which is easy to install. The split liquid sealing half ring can seal two adjacent liquid storage chambers 31 and is provided with two communicating holes 41 and an S-shaped flow channel 42.

[0041] The liquid seal suspension bushing provided by the present invention is shown in FIG. Figure 1 、 Figures 4 and 5 As shown, Figure 9 As shown, it also includes an upper frame 5 and a lower frame 6, which are embedded in the rubber body 3 and symmetrically arranged at the axial ends of the rubber body 3. The upper and lower frames can improve the rigidity of the bushing.

[0042] In some embodiments, see Figure 1 、 Figure 5 and Figure 9As shown, both the upper and lower frames 5 and 6 are equipped with opposing wings 51, which avoid the liquid storage cavity. The upper and lower frames provide support for the rubber body's shape, improving its rigidity and, consequently, the overall rigidity of the product. The upper and lower frames can be either integral or split.

[0043] In some embodiments, see Figures 1 to 12 As shown, the inner tube 1 is provided with an anti-slip protrusion 11 protruding outward along its own radial direction; the overmolded part 2 is wrapped around the inner tube 1, and the inner wall of the overmolded part 2 is provided with an anti-slip groove 21 adapted to the anti-slip protrusion 11, and the outer wall of the overmolded part 2 is provided with an annular cone 23 protruding outward along its own radial direction; the inner wall of the rubber body 3 is provided with an annular groove 35 adapted to the annular cone 23; the anti-slip protrusion 11 is staggered with the liquid inlet 13, and the liquid outlet 32 ​​is provided on the annular groove 35; an axial protrusion 22 is formed on the outer wall of the overmolded part 2 corresponding to the anti-slip groove 21, and an axial groove 34 adapted to the axial protrusion 22 is also provided on the inner wall of the rubber body 3.

[0044] The beneficial effects provided by the utility model are:

[0045] (1) By constructing the overmolded part 2 into a special-shaped structure with an annular cone 23, which cooperates with the inner tube 1 to form the inner core of the suspension bushing, the inner tube 1 has both radial stiffness and axial stiffness through the cooperation of the annular cone 23 and the rubber body 3, which can meet the stiffness requirements of the product in all directions.

[0046] (2) Since the material of the inner tube 1 is generally die-cast aluminum, when the shape and structure of the product are irregular, the size and thickness are inconsistent, and the cast product is very likely to have defects such as pores, shrinkage holes, and shrinkage, which seriously affect the quality of the product. In this embodiment, by constructing a plastic-coated part 2, there is no need to perform special-shaped construction on the inner tube 1 itself. The inner tube 1 still has a normal cylindrical structure, avoiding the problem of internal defects in the cast product when the inner tube 1 is locally thickened, improving the axial stiffness of the suspension bushing, and extending the service life of the suspension bushing.

[0047] (3) An annular truncated cone 23 is provided locally on the overmolded part 2, and the connection between the two is improved by the anti-slip protrusion 11, without the need to thicken the entire overmolded part 2, thereby reducing the weight of the product.

[0048] (4) The cooperation between the anti-slip protrusion 11 on the inner tube 1 and the anti-slip groove 21 on the overmolded part 2 can limit the circumferential displacement between the overmolded part 2 and the inner tube 1, play an anti-slip role for the overmolded part 2, and improve the reliability of the cooperation between the overmolded part 2 and the inner tube 1; the cooperation between the annular cone 23 and the rubber body 3 also improves the reliability of the axial connection between the rubber body 3 and the overmolded part 2.

[0049] Alternatively, as Figure 12As shown, the inner tube 1 is a hot extrusion molded part, and the anti-slip protrusion 11 extends along its own axial direction. The simple structure of the inner tube 1, together with the protruding anti-slip protrusion 11, can be hot extruded in one step, making it simple and convenient to make, and the texture is uniform and dense, avoiding some unnecessary defects.

[0050] In some embodiments, see Figure 1 、 Figure 4 and Figures 10 to 12 As shown, the anti-slip groove 21 forms an axial protrusion 22 on the outer wall of the overmolded part 2, and an axial groove 34 wrapping the axial protrusion 22 is provided on the inner wall of the rubber body 3; the radial length of the protrusion of the annular cone 23 is greater than the radial length of the protrusion of the axial protrusion 22.

[0051] It should be noted that if Figure 1 、 Figure 4 and Figure 5 As shown, the anti-slip groove 21 on the inner wall of the overmolded part 2 is a through-type structure, and the axial protrusion 22 on the outer wall of the overmolded part 2 is a disconnected type due to the presence of the annular cone 23. The overmolded part 2 supports the inner tube 1 and the rubber body 3. Therefore, the anti-slip groove 21 provided on the inner wall of the overmolded part 2 cooperates with the inner tube 1 and acts as a limiter when connected to the inner tube 1, thereby preventing circumferential rotation between the two. The axial protrusion on the outer wall of the overmolded part 2 cooperates with the axial groove on the inner wall of the rubber body 3, thereby limiting the rubber body 3 and preventing circumferential rotation between the two. The annular cone 23 not only bears the radial stiffness but also enhances the axial stiffness. Therefore, the annular cone 23 requires a certain radial length and axial length to support the overall stiffness.

[0052] Therefore, the anti-slip protrusions 11 on the inner tube 1, the axial protrusions 22 on the overmolded part 2 and the axial grooves on the rubber body 3 are wrapped layer by layer, thereby strengthening the limitation between the components and improving the overall stiffness of the suspension bushing in all directions.

[0053] In order to reduce the stress concentration damage problem caused by sharp corners, the two axial end faces of the annular cone 23 are both inclined surfaces. In other words, the shape of the annular cone 23 along its axial section is an isosceles trapezoid.

[0054] The overmolded part 2 is made of nylon or is injection molded integrally with the inner tube 1 . The use of a non-metallic material different from that of the inner tube 1 facilitates reliable connection with the rubber body 3 and improves the reliability of the connection with the inner tube 1 .

[0055] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0056] Based on the same inventive concept, an embodiment of the present application also provides an automobile, comprising the liquid-sealed suspension bushing.

[0057] The automobile provided by the embodiment of the present invention adopts this liquid-sealed suspension bushing, which reduces the dynamic stiffness of the product, improves the vibration and noise reduction effect of the suspension assembly, and further improves the NVH performance of the entire vehicle.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A liquid seal suspension bushing, characterized in that: include: An inner tube (1), a plastic package (2), a rubber body (3) and an outer tube (7) are coaxially nested from the inside out; wherein the inner tube (1) is provided with an axially extending liquid inlet hole (13), and the inner tube (1) is also provided with a radial hole (12) communicating with the liquid inlet hole (13); the plastic package (2) is provided with a liquid through hole (24) concentric with the radial hole (12); a liquid storage cavity (31) is provided on the outer wall of the rubber body (3), and the rubber body (3) is also provided with a liquid outlet hole (32) concentric with the liquid through hole (24), and the liquid outlet hole (32) is communicated with the liquid storage cavity (31); The liquid inlet hole (13), the radial hole (12), the liquid passage hole (24) and the liquid outlet hole (32) constitute a liquid flow channel, and the liquid is stored in the liquid storage cavity (31) through the liquid flow channel; the outer tube (7) seals the liquid storage cavity (31); A plurality of liquid storage cavities (31) are evenly distributed along the circumferential direction on the outer wall of the rubber body (3), and the liquid storage cavities (31) are interconnected; It also includes a liquid sealing ring (4), which is nested on the outer wall of the rubber body (3) so that each of the liquid storage cavities (31) forms an independent cavity, wherein a communication hole (41) is provided on the liquid sealing ring (4) corresponding to each of the liquid storage cavities (31); The inner tube (1) is symmetrically provided with two liquid inlet holes (13); the outer wall of the rubber body (3) is evenly distributed with four liquid storage cavities (31) along the circumferential direction, and one liquid inlet hole (13) is directly connected to one liquid storage cavity (31); and the liquid storage cavities (31) are connected to each other through the communication hole (41); An S-shaped flow channel (42) is provided on the outer wall of the liquid sealing ring (4), wherein the S-shaped flow channel (42) communicates with two adjacent communication holes (41), and the four communication holes (41) are staggered one above and one below along the axial direction of the liquid sealing ring (4).

2. The liquid seal suspension bushing according to claim 1, wherein: A limiting groove (33) is provided on the outer wall of the rubber body (3), and the liquid sealing ring (4) is installed in the limiting groove (33).

3. The liquid seal suspension bushing according to claim 1, wherein: It also includes an upper frame (5) and a lower frame (6), wherein the upper frame (5) and the lower frame (6) are embedded in the rubber body (3), and the upper frame (5) and the lower frame (6) are symmetrically arranged at the axial ends of the rubber body (3).

4. The liquid seal suspension bushing according to claim 3, wherein: The upper frame (5) and the lower frame (6) are both provided with wing plates (51) that are connected to each other, and the wing plates (51) avoid the liquid storage cavity (31).

5. The liquid seal suspension bushing according to claim 1, wherein: The inner tube (1) is provided with an anti-skid protrusion (11) protruding outward along its own radial direction; the overmolded part (2) is wrapped around the inner tube (1), the inner wall of the overmolded part (2) is provided with an anti-skid groove (21) adapted to the anti-skid protrusion (11), and the outer wall of the overmolded part (2) is provided with an annular cone (23) protruding outward along its own radial direction; the inner wall of the rubber body (3) is provided with an annular groove (35) adapted to the annular cone (23); the anti-skid protrusion (11) and the liquid inlet hole (13) are arranged in a staggered manner, and the liquid outlet hole (32) is arranged on the annular groove (35).

6. The liquid seal suspension bushing according to claim 5, wherein: The anti-slip groove (21) forms an axial protrusion (22) on the outer wall of the overmolded part (2), and an axial groove wrapping the axial protrusion (22) is provided on the inner wall of the rubber body (3); the radial length of the protrusion of the annular cone (23) is greater than the radial length of the protrusion of the axial protrusion (22).

7. An automobile, characterized in that: It comprises the liquid-sealed suspension bushing according to any one of claims 1 to 6.

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