A variable rate front suspension system for a commercial vehicle

Abstract

The utility model discloses a variable rigidity front suspension system for commercial vehicle, including leaf spring, leaf spring support, frame, leaf spring cover plate, shock absorber upper support, rivet, lifting lug, shock absorber, shock absorber lower support, axle and U type bolt, the both ends of frame length direction are fixed with a leaf spring support through rivet respectively, and the lifting lug is installed to the leaf spring support, and the leaf spring is fixed together with the leaf spring support through the lifting lug, and the leaf spring cover plate is located on the leaf spring, and the both ends of leaf spring cover plate are respectively crimped with U type bolt, and the both ends of U type bolt are installed on the axle, and the upper end of shock absorber is fixed on the frame through shock absorber upper support, and the lower end of shock absorber is fixed on the leaf spring through shock absorber lower support. The utility model discloses a variable rigidity front suspension system for commercial vehicle, can make front suspension system rigidity variable, and the empty full load deflection frequency basically keeps consistent and can keep low value, and makes empty full load all can keep good smoothness.

Description

Technical Field

[0001] This utility model relates to a variable stiffness front suspension system for commercial vehicles, which belongs to the field of commercial vehicle chassis. Background Technology

[0002] Currently, commercial vehicles mainly use the following two solutions for front suspension:

[0003] The first type uses a multi-leaf spring with equal cross-section, and the front suspension system is composed of components such as lugs, leaf spring pins, leaf spring supports, U-bolts, shock absorbers, and limit blocks. This type of suspension system can meet the needs of daily use, but the main load-bearing component, the leaf spring structure, is relatively bulky and has poor economic efficiency; its stiffness is not variable, and the frequency deviation changes greatly when unloaded or fully loaded, resulting in poor ride comfort.

[0004] The second type uses variable cross-section leaf springs, and the front suspension system is composed of components such as hangers, leaf spring pins, leaf spring supports, U-bolts, shock absorbers, and limit blocks. This type of suspension system can meet the needs of daily use, but the stiffness of the main load-bearing component, the leaf spring, cannot be changed, and the frequency deviation changes greatly when unloaded or fully loaded, resulting in poor ride comfort.

[0005] Therefore, it is indeed necessary to improve existing technologies to address their shortcomings. Summary of the Invention

[0006] This invention provides a variable stiffness front suspension system for commercial vehicles to solve the problems existing in the prior art. The system allows for variable stiffness, and the frequency deviation under no-load and full-load conditions remains basically consistent and can be kept at a low value, thus maintaining good ride comfort under both no-load and full-load conditions.

[0007] This utility model adopts the following technical solution: a variable stiffness front suspension system for commercial vehicles, including a leaf spring, a leaf spring support, a frame, a leaf spring cover plate, an upper shock absorber bracket, rivets, hangers, a shock absorber, a lower shock absorber bracket, an axle, and U-bolts. A leaf spring support is fixed to each of the two ends of the frame along its length by rivets. The hangers are installed on the leaf spring supports. The leaf spring and leaf spring supports are fixed together by the hangers. The leaf spring cover plate is located on the leaf spring. U-bolts are pressed onto both ends of the leaf spring cover plate. The ends of the U-bolts are inserted and installed on the axle. The upper end of the shock absorber is fixed to the frame by the upper shock absorber bracket, and the lower end of the shock absorber is fixed to the leaf spring by the lower shock absorber bracket.

[0008] Furthermore, it also includes a leaf spring pin and a pin locking bolt. The upper and lower ends of the lifting lug are provided with pin holes for installing the leaf spring pin. A first hole is formed on the leaf spring support at a position opposite to the pin hole formed at the upper end of the lifting lug. A pin locking bolt is inserted into the pin hole and the first hole to install the lifting lug onto the leaf spring support.

[0009] Furthermore, a second hole is formed on the leaf spring at a position opposite to the pin hole formed at the lower end of the lug, and a pin locking bolt is inserted into the pin hole and the second hole to fix the leaf spring and the leaf spring support together.

[0010] Furthermore, through holes are formed at the two opposite ends of the U-bolt on the axle. After the U-bolt is pressed onto the leaf spring cover plate, its two ends pass through the through holes. A second nut is tightened at both ends of the U-bolt to fix the axle and the leaf spring cover plate onto the leaf spring.

[0011] Furthermore, the leaf spring includes a first main leaf, a second main leaf, a third main leaf, a secondary spring, a shock absorber mounting leaf spring, a pad, a center bolt, and a first nut. The two ends of the first main leaf in the length direction have rolled ear structures, and bushings are installed inside the rolled ear structures.

[0012] Furthermore, a rubber pad is installed on the auxiliary spring.

[0013] Furthermore, nylon gaskets are provided between the ends of the first and second main springs, and between the ends of the second and third main springs.

[0014] Furthermore, a central pad is provided between the middle positions of the first main spring and the second main spring, and between the middle positions of the second main spring and the third main spring.

[0015] Furthermore, the first main spring, the second main spring, the third main spring, the auxiliary spring, the shock absorber mounting leaf spring, and the pad are arranged sequentially from top to bottom, and the first main spring, the second main spring, the third main spring, the auxiliary spring, the shock absorber mounting leaf spring, and the pad are fixed together by a central bolt and a first nut.

[0016] Furthermore, clamps are fixed on both sides of the leaf spring along its length.

[0017] The present invention has the following beneficial effects: By making the front suspension system stiffness variable, the vehicle's frequency deviation remains basically the same when unloaded and fully loaded, and can maintain a low value, thus ensuring smoothness across the entire load range of the vehicle. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the variable stiffness front suspension system for commercial vehicles according to this utility model.

[0019] Figure 2 This is a schematic diagram showing the installation of the leaf spring, leaf spring support, and lifting lug.

[0020] Figure 3 This is a schematic diagram of the installation of the leaf spring and leaf spring cover plate.

[0021] Figure 4 This is a schematic diagram of a leaf spring.

[0022] Figure 5 This is a partial schematic diagram of a leaf spring. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] This utility model relates to a variable stiffness front suspension system for commercial vehicles, comprising a leaf spring 3, a leaf spring support 2, a frame 1, a leaf spring cover plate 4, an upper shock absorber bracket 5, a leaf spring pin 6, a rivet 7, a hanger 8, a shock absorber 9, a lower shock absorber bracket 10, an axle 11, a U-bolt 12, and a pin locking bolt 13. A leaf spring support 2 is fixed to each of the two ends of the frame 1 along its length by rivets 7. The upper and lower ends of the hanger 8 are provided with pin holes (not shown) for installing the leaf spring pin 6. A first hole (not shown) is formed on the leaf spring support 2 opposite to the pin hole formed at the upper end of the hanger 8. A pin locking bolt 13 passes through the pin hole and the first hole to install the hanger 8 onto the leaf spring support 2. A second hole (not shown) is formed on the leaf spring 3 at a position opposite to the pin hole formed at the lower end of the lug 8. A pin locking bolt 13 is inserted into the pin hole and the second hole to fix the leaf spring 3 and the leaf spring support 2 together.

[0025] The leaf spring cover plate 4 is located on the leaf spring 3. U-bolts 12 are pressed onto both ends of the leaf spring cover plate 4. Through holes (not shown) are formed at the opposite positions of the two ends of the U-bolts 12 on the axle 11. After the U-bolts 12 are pressed onto the leaf spring cover plate 4, their two ends pass through the through holes. Then, the second nuts 27 are tightened at both ends of the U-bolts 12 to fix the axle 11 and the leaf spring cover plate 4 onto the leaf spring 3.

[0026] The upper end of the shock absorber 9 is fixed to the frame 1 by the upper shock absorber bracket 5, and the lower end of the shock absorber 9 is fixed to the leaf spring 3 by the lower shock absorber bracket 10.

[0027] The leaf spring 3 includes a first main spring 14, a second main spring 15, a third main spring 16, a secondary spring 17, a bushing 18, a nylon washer 19, a rubber washer 20, a shock absorber mounting leaf spring 21, a pad 22, a center bolt 23, a first nut 24, and a central pad 25. The first main spring 14 has rolled ear structures at both ends along its length, and the bushing 18 is installed inside the rolled ear structures. A rubber washer 20 is installed on the secondary spring 17. Nylon washer 19 is provided between the ends of the first main spring 14 and the second main spring 15, and between the ends of the second main spring 15 and the third main spring 16. A central pad 25 is provided between the middle positions of the first main spring 14 and the second main spring 15, and between the middle positions of the second main spring 15 and the third main spring 16. The first main spring 14, the second main spring 15, the third main spring 16, the auxiliary spring 17, the shock absorber mounting spring 21, and the pad 22 are arranged sequentially from top to bottom, and are fixed together by a center bolt 23 and a first nut 24. Clamps 26 are fixed on both sides of the leaf spring 3 along its length.

[0028] This invention relates to a variable stiffness front suspension system for commercial vehicles. When the vehicle is unloaded, the vehicle weight is transferred to the leaf springs 3 via the frame 1 and leaf spring supports 2. At this time, only the first main leaf spring 14, the second main leaf spring 15, and the third main leaf spring 16 are engaged in the front suspension system. The suspension system stiffness is relatively low, maintaining a small unloaded frequency deviation value and ensuring smooth vehicle operation. When the vehicle is fully loaded, the first main leaf spring 14, the second main leaf spring 15, the third main leaf spring 16, and the auxiliary spring 17 on the leaf springs 3 of the front suspension system are engaged simultaneously. The suspension system stiffness increases, ensuring that the frequency deviation under full load and unload conditions remains essentially consistent and at a low value, thus guaranteeing smooth vehicle operation. This invention, by allowing the front suspension system stiffness to be variable, ensures that the vehicle's unloaded and fully loaded frequencies remain essentially consistent and at a low value, guaranteeing smoothness across the entire load range of the vehicle.

[0029] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements can be made without departing from the principle of the present utility model, and these improvements should also be considered within the protection scope of the present utility model.

Claims

1. A variable stiffness front suspension system for commercial vehicles, characterized in that: The vehicle includes a leaf spring (3), a leaf spring support (2), a frame (1), a leaf spring cover plate (4), an upper shock absorber bracket (5), rivets (7), a shackle (8), a shock absorber (9), a lower shock absorber bracket (10), an axle (11), and U-bolts (12). At each end of the frame (1) along its length, a leaf spring support (2) is fixed by rivets (7). The shackle (8) is installed on the leaf spring support (2). The leaf spring (3) and the leaf spring support... (2) The leaf spring cover (4) is located on the leaf spring (3) and the two ends of the leaf spring cover (4) are respectively pressed with U-bolts (12). The ends of the U-bolts (12) are installed on the axle (11). The upper end of the shock absorber (9) is fixed on the frame (1) through the upper shock absorber bracket (5). The lower end of the shock absorber (9) is fixed on the leaf spring (3) through the lower shock absorber bracket (10).

2. The variable stiffness front suspension system for commercial vehicles as described in claim 1, characterized in that: It also includes a leaf spring pin (6) and a pin locking bolt (13). The upper and lower ends of the lifting lug (8) are provided with pin holes for installing the leaf spring pin (6). A first hole is formed on the leaf spring support (2) at a position opposite to the pin hole formed at the upper end of the lifting lug (8). The pin locking bolt (13) is inserted through the pin hole and the first hole to install the lifting lug (8) onto the leaf spring support (2).

3. The variable stiffness front suspension system for commercial vehicles as described in claim 2, characterized in that: A second hole is formed on the leaf spring (3) at a position opposite to the pin hole formed at the lower end of the lug (8). A pin locking bolt (13) is inserted into the pin hole and the second hole to fix the leaf spring (3) and the leaf spring support (2) together.

4. The variable stiffness front suspension system for commercial vehicles as described in claim 3, characterized in that: The two ends of the U-bolt (12) on the axle (11) are respectively formed with through holes at opposite positions. After the U-bolt (12) is pressed onto the leaf spring cover plate (4), its two ends are inserted into the through holes. The two ends of the U-bolt (12) are tightened with a second nut (27) to fix the axle (11) and the leaf spring cover plate (4) onto the leaf spring (3).

5. The variable stiffness front suspension system for commercial vehicles as described in claim 4, characterized in that: The leaf spring (3) includes a first main leaf (14), a second main leaf (15), a third main leaf (16), a secondary spring (17), a shock absorber mounting leaf spring (21), a pad (22), a center bolt (23), and a first nut (24). The two ends of the first main leaf (14) in the length direction are formed with a rolled ear structure, and a bushing (18) is installed inside the rolled ear structure.

6. The variable stiffness front suspension system for commercial vehicles as described in claim 5, characterized in that: A rubber pad (20) is installed on the auxiliary spring (17).

7. The variable stiffness front suspension system for commercial vehicles as described in claim 6, characterized in that: Nylon gaskets (19) are provided between the end of the first main spring (14) and the end of the second main spring (15), and between the end of the second main spring (15) and the end of the third main spring (16).

8. The variable stiffness front suspension system for commercial vehicles as described in claim 7, characterized in that: A central pad (25) is provided between the middle position of the first main spring (14) and the middle position of the second main spring (15), and between the middle position of the second main spring (15) and the middle position of the third main spring (16).

9. The variable stiffness front suspension system for commercial vehicles as described in claim 8, characterized in that: The first main spring (14), the second main spring (15), the third main spring (16), the auxiliary spring (17), the shock absorber mounting leaf spring (21), and the pad (22) are arranged from top to bottom, and the first main spring (14), the second main spring (15), the third main spring (16), the auxiliary spring (17), the shock absorber mounting leaf spring (21), and the pad (22) are fixed together by the center bolt (23) and the first nut (24).

10. The variable stiffness front suspension system for commercial vehicles as described in claim 9, characterized in that: The leaf spring (3) is fixed with clamps (26) on both sides along its length.

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