A kind of automobile chassis torsion beam plug-in bushing

Abstract

The utility model discloses a kind of automobile chassis torsion beam stick bushings, comprising: inner core, outer tube, rubber elastomer and limit sheet;The rubber elastomer is bonded between the inner core and the outer tube, the limit sheet is set in the axial end of the inner core, for limiting the axial displacement of rubber elastomer.This automobile chassis torsion beam stick bushing is directly set in the axial end of inner core by limit sheet, forms physical obstruction, can directly limit the axial deformation range of rubber elastomer, controls axial displacement amount, significantly prolongs rubber elastomer service life, rubber elastomer is bonded between inner core and outer tube, forms integrated structure, can pass through self elastic buffer vibration, and can also pass through bonding force auxiliary fixed relative position of inner core and outer tube, forms the double protection of initiative obstruction and passive bonding.

Description

Technical Field

[0001] This utility model relates to the field of bushing technology, and in particular to a bushing for a torsion beam insert in an automobile chassis. Background Technology

[0002] In automotive chassis systems, torsion beam suspensions are widely used in the rear axles of various passenger vehicles due to their simple structure, low cost, and ability to provide good lateral rigidity. As a key connecting component and damping element in the torsion beam suspension system, the performance of the insert bushing (or control arm bushing) directly affects the vehicle's handling stability, ride comfort, and noise, vibration, and acoustic roughness.

[0003] Currently, traditional torsion beam bushings on the market typically consist of three parts: an inner core, a vulcanized rubber layer, and an outer tube. They absorb and buffer vibrations and impacts from the road surface through the elastic deformation of the rubber, achieving a flexible connection between the torsion beam and the vehicle body. However, under extreme operating conditions or after long-term use, the rubber body may experience excessive axial displacement. This not only changes the stress point of the bushing, affecting vehicle alignment parameters, and exacerbates rubber fatigue wear, shortening its service life, but in severe cases, it may even lead to premature bushing failure or impact block cracking, posing certain safety hazards. Utility Model Content

[0004] This invention provides a torsion beam insert bushing for automotive chassis, which can solve the problem mentioned in the background art that the rubber body may have excessive axial displacement. This not only changes the stress point of the bushing and affects the vehicle positioning parameters, but also aggravates the fatigue wear of the rubber. In severe cases, it may even lead to premature failure of the bushing or cracking of the impact block.

[0005] A torsion beam insert bushing for automobile chassis, used for positioning and clamping buckets, includes: an inner core, an outer tube, a rubber elastomer, and a limiting plate; the rubber elastomer is bonded between the inner core and the outer tube; the limiting plate is disposed at the axial end of the inner core to limit the axial displacement of the rubber elastomer.

[0006] Preferably, the inner core includes a core body and a mounting plate, with mounting plates connected to both ends of the core body, and mounting holes provided on each mounting plate.

[0007] Preferably, a limiting groove is formed between the mounting plate and the end of the core.

[0008] Preferably, the outer tube end is provided with a first connecting ring plate, and the rubber elastomer end is provided with a second connecting ring plate adapted to the first connecting ring plate.

[0009] Preferably, the rubber elastomer has a cavity inside.

[0010] Preferably, the limiting piece includes a limiting plate and a positioning plate, the positioning plate is connected to one side of the limiting plate, the limiting plate has a limiting hole in the center, and the positioning plate has a positioning hole.

[0011] Preferably, the axis of the positioning hole and the axis of the mounting hole are on the same straight line.

[0012] Preferably, the positioning plate has an arc-shaped groove at one end near the limiting plate.

[0013] Preferably, the positioning hole is adapted to the end of the mounting plate near the core, and the limiting plate is adapted to the limiting slot.

[0014] Preferably, there are two cavities, and a rubber strip is formed inside each cavity.

[0015] Preferably, the second guide groove is located between the limiting block and the first guide groove.

[0016] The beneficial effects of this utility model are: The torsion beam insert bushing of this automobile chassis is directly set at the axial end of the inner core through a limiting plate, forming a physical barrier. This directly limits the axial deformation range of the rubber elastomer, preventing the rubber elastomer from exceeding its elastic limit due to excessive displacement. It controls the amount of axial displacement, significantly extending the service life of the rubber elastomer. The rubber elastomer is bonded between the inner core and the outer tube, forming an integrated structure. It can both buffer vibration through its own elasticity and help fix the relative position of the inner core and the outer tube through adhesive force, reducing the initial cause of axial displacement. Combined with the end limiting of the limiting plate, it forms a dual guarantee of active blocking and passive bonding. Attached Figure Description

[0017] Figure 1 A schematic diagram of the structure of the automobile chassis torsion beam insert bushing provided by this utility model; Figure 2 A top view of the torsion beam insert bushing for automobile chassis provided by this utility model; Figure 3 A cross-sectional view of the torsion beam insert bushing for automobile chassis provided by this utility model; Figure 4 for Figure 1 Schematic diagram of the inner core structure; Figure 5 for Figure 1 Schematic diagram of the structure of rubber elastomer; Figure 6 for Figure 1 A schematic diagram of the structure of the middle limiting plate.

[0018] Explanation of reference numerals in the attached figures: 1. Inner core; 2. Outer tube; 3. Rubber elastomer; 4. Limiting plate; 101. Core; 102. Mounting plate; 103. Mounting hole; 104. Limiting slot; 201. First connecting ring plate; 31. Second connecting ring plate; 32. Cavity; 33. Rubber strip; 41. Limiting plate; 42. Positioning plate; 43. Limiting hole; 44. Positioning hole; 45. Arc groove. Detailed Implementation

[0019] The specific embodiments of this utility model are described in detail below, but it should be understood that the protection scope of this utility model is not limited to the specific embodiments.

[0020] like Figure 1-3 As shown, this utility model proposes a torsion beam insert bushing for automobile chassis, comprising: an inner core 1, an outer tube 2, a rubber elastomer 3, and a limiting piece 4; the rubber elastomer 3 is bonded between the inner core 1 and the outer tube 2; the limiting piece 4 is disposed at the axial end of the inner core 1 to limit the axial displacement of the rubber elastomer 3.

[0021] In the technical solution of this utility model, the limiting piece 4 is directly set at the axial end of the inner core 1 to form a physical barrier, which can directly limit the axial deformation range of the rubber elastomer 3. When the bushing is subjected to impact load and axial displacement occurs, the limiting piece 4 can quickly bear the load, preventing the rubber elastomer from exceeding its elastic limit due to excessive displacement. This controls the amount of axial displacement and significantly extends the service life of the rubber elastomer. The rubber elastomer 3 is bonded between the inner core 1 and the outer tube 2 to form an integrated structure. It can not only buffer vibration through its own elasticity, but also help fix the relative position of the inner core and the outer tube through adhesive force, reducing the initial cause of axial displacement. Combined with the end limiting of the limiting piece 4, it forms a dual guarantee of active blocking and passive bonding.

[0022] The inner core 1 is made of 40Cr material, the outer tube 2 is made of 20# steel material, the rubber elastomer 3 is made of natural rubber material, and the limiting piece 4 is made of QSTE500 material.

[0023] like Figure 1 and Figure 4 As shown, the inner core 1 includes a core body 101 and a mounting plate 102. The mounting plate 102 is connected to both ends of the core body 101, and mounting holes 103 are provided on each mounting plate 102. The mounting plates 102 extend laterally to both ends of the core body 101, increasing the contact area between the inner core and the rubber elastomer 3 compared to a traditional cylindrical inner core.

[0024] Larger contact area allows for more uniform transfer of bonding stress, preventing rubber peeling caused by localized stress concentration.

[0025] Specifically, a limiting groove 104 is formed between the mounting plate 102 and the end of the core 101.

[0026] like Figure 2 and Figure 3 As shown, the outer tube 2 is provided with a first connecting ring plate 201 at its end, and the rubber elastomer 3 is provided with a second connecting ring plate 31 that is adapted to the first connecting ring plate 201 at its end. The first connecting ring plate 201 of the outer tube 2 and the second connecting ring plate 31 of the rubber elastomer 3 are precisely matched in size and form an annular snap-fit ​​structure after vulcanization. The second connecting ring plate 31 is connected to the outside of the first connecting ring plate 201, which restricts the axial separation of the rubber from the outer tube and makes it difficult for the rubber to fall off from the outer tube. The bonding stress is evenly transmitted through the annular contact surface of the ring plate, avoiding the damage to the bonding layer caused by local stress concentration.

[0027] like Figure 3 and Figure 5 As shown, the rubber elastomer 3 has a cavity 32 inside; through the two cavities 32 inside the rubber elastomer 3, a flexible area can be formed in the corresponding direction (such as the vehicle's transverse Y direction). When the road surface is bumpy and vibrates, the rubber in the cavity area is easy to deform, absorb vibration energy, and significantly improve ride comfort.

[0028] Specifically, there are two cavities 32, and each cavity 32 has a rubber strip 33 inside. The rubber strip 33 inside each cavity 32 can provide rigid support in another direction (such as the longitudinal X direction of the vehicle). When the vehicle turns or brakes, the rubber strip can quickly bear the load, limit the excessive deformation of the bushing, and ensure the vehicle's handling stability. The rubber strip 33 in the cavity area can also serve as a structural reinforcing rib to prevent the rubber from tearing due to excessive deformation of the cavity.

[0029] The symmetrical distribution of the two cavities can avoid stiffness shift of the bushing caused by a cavity on one side, ensuring force balance.

[0030] like Figure 1 and Figure 6 As shown, the limiting plate 4 includes a limiting plate 41 and a positioning plate 42. The positioning plate 42 is connected to one side of the limiting plate 41. The limiting plate 41 has a limiting hole 43 in the center, and the positioning plate 42 has a positioning hole 44. When the bushing is subjected to road impact or torsional load of the torsion beam, the rubber elastomer 3 is easily stretched or compressed along the axial direction. The limiting plate 41 is precisely matched with the limiting groove 104 of the inner core 1 to form a physical blocking surface, which can directly bear the axial force transmitted by the rubber elastomer, avoid the vehicle positioning parameters from being offset due to excessive rubber displacement, and at the same time reduce the fatigue wear caused by excessive deformation of the rubber and extend the service life of the bushing.

[0031] Specifically, the positioning plate 42 has an arc-shaped groove 45 at one end near the limiting plate 41. The arc-shaped groove 45 at the end of the positioning plate 42 near the limiting plate 41 changes the traditional right-angle connection to an arc transition. Finite element analysis has verified that this can reduce the stress concentration factor in this part. The radial and axial stresses generated by the interference fit will be evenly transmitted to the limiting plate 41 and the positioning plate 42 along the arc surface, avoiding excessive local stress and reducing the deformation rate of the limiting piece 4. The arc-shaped groove 45 also reserves a small deformation space for the positioning plate 42. When the bushing is subjected to instantaneous impact load, the positioning plate 42 can generate a small elastic deformation along the direction of the arc-shaped groove to absorb part of the impact energy and avoid the positioning plate from breaking due to rigid collision.

[0032] The positioning hole 44 is adapted to the end of the mounting plate 102 near the core 101, and the limiting plate 41 is adapted to the limiting slot 104. The limiting plate 41 of the limiting piece 4 is precisely matched with the limiting slot 104 of the inner core 1 in size. During assembly, the limiting plate 41 can be embedded in the limiting slot 104 to form a slot positioning, which directly restricts the radial and circumferential displacement of the limiting piece and avoids the limiting piece from swaying due to vibration.

[0033] The axis of the positioning hole 44 is collinear with the axis of the mounting hole 103. Since the positioning hole 44 of the positioning plate 42 and the mounting hole 103 of the inner core mounting plate 102 are collinear, bolt positioning can be achieved during assembly by passing bolts through the double holes. On one hand, the coaxial design ensures that the relative position of the limiting piece and the inner core is fixed; on the other hand, the preload of the bolts can further lock the limiting piece, preventing relative slippage between the limiting piece and the inner core even under extreme impact conditions.

[0034] Working principle: The inner core 1's core body 101 is connected to mounting plates 102 at both ends. The mounting holes 103 on the mounting plates 102 are fixed to the torsion beam via bolts, forming a rigid integrated structure between the inner core 1 and the torsion beam. The outer tube 2 is fixed to the vehicle body suspension bracket via interference fit or bolt connection. The first connecting ring plate 201 at the end of the outer tube engages with the second connecting ring plate 31 of the rubber elastomer 3, preventing the rubber elastomer from peeling off from the inner wall of the outer tube and ensuring the connection stability between the outer tube and the vehicle body bracket. The impact load generated by road bumps is transmitted through the torsion beam. The load is transferred from the beam to the inner core 1, which then transfers the load to the rubber elastomer 3. The rubber elastomer absorbs vibration energy through its own elastic deformation, reducing the transmission of vibration to the vehicle body and improving ride comfort. The limiting piece 4 is directly set at the axial end of the inner core 1 to form a physical barrier, which can directly limit the axial deformation range of the rubber elastomer 3. When the bushing is subjected to impact load and axial displacement occurs, the limiting piece 4 can quickly bear the load, preventing the rubber elastomer from exceeding its elastic limit due to excessive displacement, thus controlling the amount of axial displacement and significantly extending the service life of the rubber elastomer.

[0035] The above-disclosed embodiments are only a few specific examples of the present utility model. However, the embodiments of the present utility model are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.

Claims

1. A torsion beam insert bushing for an automobile chassis, characterized in that, include: Inner core (1), outer tube (2), rubber elastomer (3) and limiting piece (4); The rubber elastomer (3) is bonded between the inner core (1) and the outer tube (2); The limiting piece (4) is disposed at the axial end of the inner core (1) to limit the axial displacement of the rubber elastomer (3); The limiting piece (4) includes a limiting plate (41) and a positioning plate (42). The positioning plate (42) is connected to one side of the limiting plate (41). The limiting plate (41) has a limiting hole (43) in the center, and the positioning plate (42) has a positioning hole (44). The positioning plate (42) has an arc-shaped groove (45) at one end near the limiting plate (41).

2. The automobile chassis torsion beam insert bushing as described in claim 1, characterized in that, The inner core (1) includes a core body (101) and a mounting plate (102). The core body (101) is connected to the mounting plate (102) at both ends, and the mounting plate (102) is provided with mounting holes (103).

3. The automobile chassis torsion beam insert bushing as described in claim 2, characterized in that, A limiting groove (104) is formed between the mounting plate (102) and the end of the core (101).

4. The automobile chassis torsion beam insert bushing as described in claim 1, characterized in that, The outer tube (2) is provided with a first connecting ring plate (201) at its end, and the rubber elastomer (3) is provided with a second connecting ring plate (31) that is adapted to the first connecting ring plate (201) at its end.

5. The automobile chassis torsion beam insert bushing as described in claim 1, characterized in that, The rubber elastomer (3) has a cavity (32) inside.

6. The automobile chassis torsion beam insert bushing as described in claim 1, characterized in that, The axis of the positioning hole (44) is on the same straight line as the axis of the mounting hole (103).

7. The automobile chassis torsion beam insert bushing as described in claim 1, characterized in that, The positioning hole (44) is adapted to the end of the mounting plate (102) near the core (101), and the limiting plate (41) is adapted to the limiting slot (104).

8. The automobile chassis torsion beam insert bushing as described in claim 5, characterized in that, Two cavities (32) are provided, and a rubber strip (33) is formed inside each cavity (32).

Images