Shock-absorbing and buffering air suspension mechanism for rear axle

Abstract

The utility model discloses a rear axle shock-absorbing buffer air suspension mechanism, which belongs to the technical field of automobile shock absorption and particularly comprises two groups of air suspension units, each group of air suspension unit comprises a support unit, a main guide arm is rotatably mounted on the inner side of each support unit, and a shock absorber is hinged to the front end of each main guide arm. A connecting plate is transversely fixed between the front ends of the main guide arms of the two sets of air suspension units, and air bags are installed between the tops of the two ends of the connecting plate and the vehicle frame through installation base plates. Compared with the structural design of a traditional air suspension system, the shock absorber is located at the end of the guide arm, the service life of the shock absorber in the air suspension mechanism can be effectively prolonged, the deflection angle of shaft sleeves at the two ends of the shock absorber can be effectively reduced due to the fact that the shock absorber is located at the tail end of the guide arm, and the service life is prolonged. Therefore, the service life of the shaft sleeves at two ends of the damper is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile shock absorption, and in particular relates to a rear axle shock-absorbing and buffering air suspension mechanism. Background Art

[0002] In the automotive field, the air suspension system is a very common rear axle shock absorbing and buffering mechanism. At present, the guide arm design in the rear axle air suspension system on commercial vehicles usually adopts two types: straight arm and Z-shaped bent arm.

[0003] Among them, when installing the straight arm guide arm, it is installed on the bottom of the axle by means of U-bolts. When the suspension system buffers the axle, the U-bolts are subjected to huge force and are easily damaged, thus affecting the normal use of the suspension. While the guide arm with a Z-shaped curved arm design can use the guide arm as the main force-bearing structure during installation, the shock absorbers in the currently known Z-shaped curved arm air suspension systems are all arranged in the middle of the guide arm or are installed obliquely at the rear end of the guide arm, while the airbag is installed at the rear end of the guide arm. When performing conventional rear axle shock absorption, the shock absorber is impacted first, and the airbag structure, which is the main structure to bear the impact, can only take effect after the shock absorber is contracted under force. As a result, the service life of the shock absorbers in the current conventional Z-shaped curved arm air suspension system is generally short. Moreover, the shock absorber is arranged in the middle of the guide arm. During the operation of the air suspension, the shock absorber has a large movable stroke, and the shaft sleeves of the movable joints at both ends have a short service life, which can easily cause abnormal noise due to friction damage.

[0004] Therefore, we propose an improved rear axle shock-absorbing and buffering air suspension mechanism. Utility Model Content

[0005] The utility model aims to provide a rear axle shock-absorbing and buffering air suspension mechanism to solve the above-mentioned problems existing in the prior art.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A rear axle shock-absorbing and buffering air suspension mechanism comprises two groups of air suspension units installed on a frame, each group of air suspension units comprises a bracket unit fixed to the outside of the frame, a main guide arm is rotatably installed on the inner side of the bracket unit, a shock absorber lower bracket is provided at the front end of the main guide arm, a shock absorber is hinged at the front end of the shock absorber lower bracket, a shock absorber is hinged at the top end of the shock absorber to an upper shock absorber bracket fixedly connected to the frame, a connecting plate is transversely fixed between the front ends of the main guide arms of the two groups of air suspension units, and air bags are installed between the tops of the two ends of the connecting plate and the frame via mounting pads.

[0008] Furthermore, the shock absorber lower bracket and the end of the connecting plate overlap each other up and down, and the shock absorber lower bracket and the connecting plate are fixed to the front end of the main guide arm by any one of bolts or rivets.

[0009] Furthermore, the main guide arm is of Z-shaped design, a U-shaped bottom plate is installed in the middle of the main guide arm through a U-shaped bolt, the U-shaped bottom plate is located at the bottom of the main guide arm, and a steel plate cover is also provided between the U-shaped bolt and the main guide arm.

[0010] Furthermore, the bracket unit includes a guide arm bracket installed on the frame, and a U-shaped mounting groove is integrally formed on both sides of the bottom of the guide arm bracket. A plug column is horizontally arranged in the groove between the two mounting grooves, and both ends of the plug column are assembled and connected to the mounting groove through pins, and the tail end of the main guide arm is sleeved on the outside of the plug column.

[0011] Furthermore, a secondary guide arm is provided at the bottom of the rear end of the main guide arm, and the front end of the secondary guide arm is located above the U-shaped bottom plate and is in close contact with the bottom surface of the main guide arm.

[0012] Furthermore, a transverse thrust rod assembly is installed on the inner side of the frame, and the transverse thrust rod assembly includes a thrust rod bracket installed on the inner side of the frame and a transverse thrust rod hinged to the thrust rod bracket through a thrust rod rubber sleeve, both ends of the thrust rod rubber sleeve are fixed to the thrust rod bracket by bolts, and the front end of the transverse thrust rod is provided with a connecting piece for fixed assembly with a prefabricated hole on the bridge housing.

[0013] Furthermore, the airbag and the shock absorber are located on the same side of the axle.

[0014] Furthermore, a template frame is provided on the side of the U-shaped bottom plate in contact with the surface of the axle.

[0015] Furthermore, a limiting block is installed at the bottom of the frame at a position corresponding to the U-bolt.

[0016] Beneficial effects:

[0017] The utility model improves the design of the traditional air suspension system structure, connects the two groups of air suspension units into one through a connecting plate, realizes the synchronous force of the double airbags, and improves the upper limit of the impact force resistance of the whole suspension system. Secondly, by installing the shock absorber at the front end of the guide arm through the shock absorber lower bracket, compared with the structural design of the traditional air suspension system, the shock absorber is located at the end of the guide arm. In the process of shock absorption and buffering of the air suspension, the airbag, which is the main impact bearer, will be subjected to the impact before the shock absorber, which can effectively reduce the impact pressure of the shock absorber and effectively improve the service life of the shock absorber in the air suspension mechanism. Secondly, in this design, since the shock absorber is located at the rear end of the guide arm, the active stroke of the shock absorber is relatively short, so that the deflection angle of the shaft sleeves at both ends of the shock absorber can be effectively reduced, thereby achieving the effect of extending the service life of the shaft sleeves at both ends of the shock absorber. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the utility model Figure 1 ;

[0019] Figure 2 This is a schematic diagram of the structure of the utility model Figure 2 ;

[0020] Figure 3 For this utility model Figure 1 Enlarged structural diagram at A in the middle.

[0021] In the figure: 1. bracket unit; 101. guide arm bracket; 102. mounting groove; 103. pin; 104. plug column; 2. shock absorber upper bracket; 3. main guide arm; 4. U-shaped bolt; 5. U-shaped bottom plate; 6. shock absorber lower bracket; 7. shock absorber; 8. connecting plate; 9. airbag; 10. mounting pad; 11. steel plate cover; 12. auxiliary guide arm; 13. lateral thrust rod assembly; 131. thrust rod bracket; 132. thrust rod rubber sleeve; 133. lateral thrust rod; 14. frame. DETAILED DESCRIPTION

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the utility model will be briefly introduced below in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of the utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work. It should be noted that the description of these embodiments is used to help understand the utility model, but does not constitute a limitation of the utility model.

[0023] Example

[0024] In view of the structural design of the common straight arm and curved arm air suspension systems on the market, there are problems such as easy damage and breakage in long-term practice. We have made structural improvements to the existing air suspension mechanism and proposed an improved rear axle air suspension mechanism to effectively extend the service life of the air suspension. The specific plan is as follows:

[0025] like Figure 1-2 As shown, this embodiment provides a rear axle shock-absorbing and buffering air suspension mechanism, including two groups of air suspension units installed on a frame 14, each group of air suspension units includes a bracket unit 1 fixed to the outside of the frame 14, a main guide arm 3 is rotatably installed on the inner side of the bracket unit 1, a shock absorber lower bracket 6 is provided at the front end of the main guide arm 3, a shock absorber 7 is hinged at the front end of the shock absorber lower bracket 6, a shock absorber upper bracket 2 fixedly connected to the frame 14 is hinged at the top of the shock absorber 7, a connecting plate 8 is transversely fixed between the front ends of the main guide arms 3 of the two groups of air suspension units, an air bag 9 is installed between the top of both ends of the connecting plate 8 and the frame 14 through an installation pad 10, and the entire air suspension system connects the two groups of air suspension units into one through the connecting plate 8 to achieve double The airbag 9 is stressed synchronously, which improves the upper limit of the impact resistance of the entire suspension system. Secondly, the shock absorber 7 is installed at the front end of the guide arm through the shock absorber lower bracket 6. Compared with the structural design of the traditional air suspension system, the shock absorber 7 is located at the end of the guide arm. In the process of shock absorption and buffering of the air suspension, the airbag 9, which mainly bears the impact, will bear the impact before the shock absorber 7, which can effectively reduce the impact resistance pressure of the shock absorber 7 and effectively improve the service life of the shock absorber 7 in the air suspension mechanism. Secondly, in this design, since the shock absorber 7 is located at the rear end of the guide arm, the active stroke of the shock absorber 7 is relatively short, which can effectively reduce the deflection angle of the shaft sleeves at both ends of the shock absorber 7, thereby achieving the effect of extending the service life of the shaft sleeves at both ends of the shock absorber 7.

[0026] In order to facilitate the installation and fixation of the shock absorber lower bracket 6 and the connecting plate 8, as shown in FIG. Figure 1-2 As shown, the lower bracket 6 of the shock absorber overlaps with the end of the connecting plate 8, and the lower bracket 6 of the shock absorber and the connecting plate 8 are fixed to the front end of the main guide arm 3 by any one of bolts or rivets.

[0027] In order to make the air suspension mechanism of the rear axle of the vehicle fully utilize the space between the rear axle of the vehicle and the frame 14 as much as possible during installation, the air suspension mechanism can be reasonably combined with the frame 14, such as Figure 1-2 As shown, the main guide arm 3 adopts a Z-shaped bent arm design, and a U-shaped bottom plate 5 is installed in the middle of the main guide arm 3 through a U-shaped bolt 4. The U-shaped bottom plate 5 is located at the bottom of the main guide arm 3. In order to make the U-shaped bolt 4 bear force evenly, a steel plate cover 11 is also provided between the U-shaped bolt 4 and the main guide arm 3.

[0028] In order to enable the main steering arm 3 to have a certain upward and downward mobility, the rear axle is subjected to anti-vibration buffering by means of the airbag 9 and the shock absorber 7. Figure 1-2 As shown, the bracket unit 1 includes a guide arm bracket 101 installed on the frame 14, and a U-shaped mounting groove 102 is integrally formed on both sides of the bottom of the guide arm bracket 101. A plug column 104 is horizontally arranged in the groove between the two mounting grooves 102. The two ends of the plug column 104 are assembled and connected with the mounting groove 102 through pins 103, and the tail end of the main guide arm 3 is sleeved on the outside of the plug column 104.

[0029] like Figure 1-2 As shown, a secondary guide arm 12 is also provided at the bottom of the rear end of the main guide arm 3. The front end of the secondary guide arm 12 is located above the U-shaped bottom plate 5 and is tightly attached to the bottom surface of the main guide arm 3. The main function of setting the secondary guide arm 12 is to improve the compressive load-bearing capacity of the air suspension mechanism.

[0030] In order to avoid the rear axle from shifting left and right, it is necessary to locate the rear axle. Figure 1-3 As shown, a transverse thrust rod assembly 13 is also installed on the inner side of the vehicle frame 14. Compared with the traditional bridge housing limiting assembly, there is only one transverse thrust rod assembly 13 in this embodiment, and the transverse thrust rod assembly 13 includes a thrust rod bracket 131 installed on the inner side of the vehicle frame 14 and a transverse thrust rod 133 hinged on the thrust rod bracket 131 through a thrust rod rubber sleeve 132. Both ends of the thrust rod rubber sleeve 132 are fixedly installed on the thrust rod bracket 131 by bolts. The front end of the transverse thrust rod 133 is provided with a connecting piece for fixed assembly with the prefabricated hole on the bridge housing. The transverse thrust rod assembly 13 is fixedly connected to the bridge housing of the rear axle of the vehicle through the connecting piece, and the left and right positions of the rear axle of the vehicle can be positioned.

[0031] like Figure 1-3 As shown, the airbag 9 and the shock absorber 7 are located on the same side of the axle. The airbag 9 and the shock absorber 7 are arranged on the same side of the axle. Since the main guide arm 3 and the bracket unit 1 are rotatably assembled and connected by the plug column 104, the main guide arm 3 uses the plug column 104 as a fulcrum, the rear axle installation position is the resistance point, and the airbag 9 and the shock absorber 7 are the force application points, thereby achieving a labor-saving lever structure, which can effectively reduce the impact force of the main guide arm 3 on the airbag 9 and the shock absorber 7 when it is impacted, and has an effective protective effect on the airbag 9 and the shock absorber 7.

[0032] In order to improve the stability between the rear axle and the air suspension mechanism during assembly, a template frame is provided on the side of the U-shaped bottom plate 5 that contacts the axle surface. An adaption groove that matches the shape of the axle shell is integrally formed on the template, and a limit block is also installed at the bottom of the frame 1 corresponding to the position of the U-shaped bolt 4.

[0033] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rear axle shock-absorbing and buffering air suspension mechanism, comprising two sets of air suspension units mounted on a vehicle frame (14), characterized in that: Each set of air suspension units comprises a bracket unit (1) fixed to the outside of a vehicle frame (14); a main guide arm (3) is rotatably mounted on the inside of the bracket unit (1); a shock absorber lower bracket (6) is provided at the front end of the main guide arm (3); a shock absorber (7) is hingedly connected to the front end of the shock absorber lower bracket (6); the top end of the shock absorber (7) is hingedly connected to a shock absorber upper bracket (2) fixedly connected to the vehicle frame (14); a connecting plate (8) is transversely fixed between the front ends of the main guide arms (3) of the two sets of air suspension units; air bags (9) are installed between the tops of both ends of the connecting plate (8) and the vehicle frame (14) via mounting pads (10).

2. The rear axle shock-absorbing and buffering air suspension mechanism according to claim 1, characterized in that: The ends of the shock absorber lower bracket (6) and the connecting plate (8) overlap each other, and the shock absorber lower bracket (6) and the connecting plate (8) are fixed to the front end of the main guide arm (3) by means of any one of bolts or rivets.

3. The rear axle shock-absorbing and buffering air suspension mechanism according to claim 1, characterized in that: The main guide arm (3) is of Z-shaped design. A U-shaped bottom plate (5) is installed in the middle of the main guide arm (3) via a U-shaped bolt (4). The U-shaped bottom plate (5) is located at the bottom of the main guide arm (3). A steel plate cover (11) is also provided between the U-shaped bolt (4) and the main guide arm (3).

4. The rear axle shock-absorbing and buffering air suspension mechanism according to claim 1, characterized in that: The bracket unit (1) comprises a guide arm bracket (101) mounted on a vehicle frame (14); a U-shaped mounting groove (102) is integrally formed on both sides of the bottom of the guide arm bracket (101); a plug post (104) is transversely arranged in the groove between the two mounting grooves (102); the two ends of the plug post (104) are assembled and connected to the mounting groove (102) via a pin post (103); and the rear end of the main guide arm (3) is sleeved outside the plug post (104).

5. The rear axle shock-absorbing and buffering air suspension mechanism according to claim 3, characterized in that: A secondary guide arm (12) is also provided at the bottom of the rear end of the main guide arm (3), and the front end of the secondary guide arm (12) is located above the U-shaped bottom plate (5) and is in close contact with the bottom surface of the main guide arm (3).

6. The rear axle shock-absorbing and buffering air suspension mechanism according to claim 1, characterized in that: A transverse thrust rod assembly (13) is also installed on the inner side of the vehicle frame (14). The transverse thrust rod assembly (13) comprises a thrust rod bracket (131) installed on the inner side of the vehicle frame (14) and a transverse thrust rod (133) hinged to the thrust rod bracket (131) via a thrust rod rubber sleeve (132). Both ends of the thrust rod rubber sleeve (132) are fixedly installed on the thrust rod bracket (131) via bolts. A connecting piece for fixing and assembling with a prefabricated hole on a bridge housing is provided at the front end of the transverse thrust rod (133).

7. The rear axle shock-absorbing and buffering air suspension mechanism according to claim 1, characterized in that: The air bag (9) and the shock absorber (7) are located on the same side of the vehicle axle.

8. The rear axle shock-absorbing and buffering air suspension mechanism according to claim 3, characterized in that: A template frame is provided on the side of the U-shaped bottom plate (5) that contacts the surface of the vehicle bridge.

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