Leaf spring lower mounting structure for rear axle

Abstract

The utility model belongs to the technical field of rear axle bridge pipe connection, concretely relates to a plate spring under-mounted rear axle mounting structure, include: plate spring, it is composed of several alloy spring leafs, rear axle bridge pipe, it is in the braking process and vehicle suspension system synergistic effect, connecting assembly, it is used for fixing rear axle bridge pipe in the above of plate spring, makes the arc concave surface of plate spring with rear axle bridge pipe opposite, the utility model discloses through rigid connection ensures that load has no loss transmission, effectively restrained the axial rotation of rear axle bridge pipe when high -speed brake, thereby increases the braking effect of vehicle, to prolong its effective brake distance, to heavy -duty vehicle through plate spring under-mounted design makes plate spring directly support rear axle bridge pipe, especially for passenger vehicle, after effectively reducing the car body, chassis is lower, travels more stably, is more convenient for the guest to get on and off the car, shortens the car distance and forms more compact mechanical structure simultaneously, makes the vehicle on the bumpy road, will impact force fast dispersion to the frame, reduces the stress concentration of single component, prolongs the life, and is convenient for dismounting maintenance.

Description

Technical Field

[0001] This utility model belongs to the technical field of rear axle tube connection, specifically relating to a leaf spring under-mounted rear axle mounting structure. Background Technology

[0002] During braking, the rear axle plays multiple crucial roles. It not only transmits braking force, translating the driver's braking command from pressing the brake pedal into deceleration of the wheels; it also bears the braking torque, ensuring vehicle stability during braking; and simultaneously assists the parking brake system in ensuring reliable parking after the vehicle has come to a complete stop. The rear axle is equipped with braking devices. When the driver presses the brake pedal, the braking system transmits braking force to the brakes on the rear axle, which then act on the rear wheels, causing them to decelerate or stop rotating. In this process, the rear axle, as the key hub for transmitting braking force, ensures that the braking force is applied accurately and promptly to the wheels, achieving smooth deceleration or stopping of the vehicle.

[0003] Typically, the rear axle tube is directly fixed to the leaf spring using U-bolts. During high-speed braking, the rear axle itself may rotate slightly due to the braking torque. This rotation can cause a deviation in the transmission of braking force, thus affecting the vehicle's braking efficiency and increasing the effective braking distance. In existing technology, some have proposed replacing the round rear axle tube with a square one to suppress this rotation. However, square tubes suffer from stress concentration issues, resulting in a significant decrease in load-bearing capacity and compressive strength compared to round tubes. Furthermore, the manufacturing process for square tubes is more complex, significantly increasing production costs. Moreover, for heavier vehicles, especially passenger vehicles, a lower chassis after effectively lowering the vehicle body improves stability and facilitates passenger boarding and alighting. With the leaf spring mounted above the rear axle tube, the bottom clearance increases significantly, compromising vehicle stability. Additionally, when the leaf spring needs replacement or repair, the entire vehicle must be flipped over for inspection and maintenance, which is time-consuming and labor-intensive. Utility Model Content

[0004] The purpose of this utility model is to provide a leaf spring under-mounted rear axle mounting structure, including: A leaf spring is composed of several alloy spring plates; The rear axle tube works in conjunction with the vehicle's suspension system during braking; A connecting assembly for fixing the rear axle tube above the leaf spring, such that the concave surface of the leaf spring faces the rear axle tube.

[0005] Preferably, the connecting assembly includes a bridge tube connector, a square screw, and a pressure plate; The bridge tube connector is divided into a mating surface and a fixing surface. The mating surface is an arc-shaped surface that is welded to the upper surface of the rear axle tube. The mating surface matches the arc of the rear axle tube surface. The fixing surface has two fixing grooves of the same size. The shape and arc of the fixing grooves match the shape of the square screw. The bridge tube connector has a square hole that runs through the front and back.

[0006] Preferably, the square screw passes sequentially through the bridge tube connector, the rear axle tube, the leaf spring support pad, and both sides of the leaf spring, and is tightened in cooperation with the pressure plate.

[0007] Preferably, the bottom of the leaf spring support pad is in close contact with the surface of the leaf spring, and the top of the leaf spring support pad has an arc-shaped groove that matches the rear axle tube.

[0008] Preferably, the upper surface of the pressure plate is in contact with the arcuate convex surface of the leaf spring, and the upper surface of the pressure plate is provided with two parallel limiting strips, the width of the leaf spring being the same as the distance between the two limiting strips.

[0009] The beneficial effects of this utility model are: By installing the leaf springs under the rear axle tube and the pressure plate at the very bottom, the ground clearance of heavy vehicles is effectively shortened. This is especially beneficial for passenger vehicles, as it lowers the vehicle body, resulting in a lower chassis, more stable driving, and easier passenger boarding and alighting. Simultaneously, the shortened ground clearance creates a more compact mechanical structure, allowing for faster distribution of impact forces to the frame when driving on bumpy roads, reducing stress concentration on individual components and extending service life. Furthermore, with the disassembly points and leaf springs located at the very bottom, accurate disassembly and maintenance can be performed without overturning the vehicle, improving maintenance efficiency.

[0010] By tightly fitting the axle tube connector in the connecting assembly with the rear axle tube, and by having square screws pass sequentially through the axle tube connector, the rear axle tube, the leaf spring support pad, and both sides of the leaf spring, and tighten them in conjunction with the pressure plate, this multi-component tight connection forms a stable overall structure. This avoids the rear axle tube from rotating due to uneven contact surfaces or gaps, thus preventing the dispersion of braking force and energy loss. It ensures the integrity and stability of braking force during transmission, allowing the braking system to respond to braking commands more quickly, improving braking efficiency, and extending the effective braking distance.

[0011] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and the accompanying drawings.

[0012] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0013] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this utility model; Figure 2 This is a schematic diagram of the fixing surface of the bridge tube connector according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the mating surface of the bridge tube connector according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the base plate structure of an embodiment of this utility model; Figure 5 This is a cross-sectional view of an embodiment of the present invention; Figure 6 This is a schematic diagram of the connecting component structure of this utility model.

[0015] In the picture: 1. Leaf spring, 2. Rear axle tube, 3. Connecting assembly, 4. Axle tube connector, 5. Square screw, 6. Pressure plate, 7. Fitting surface, 8. Fixing surface, 9. Fixing and limiting groove, 10. Square hole, 11. Leaf spring support pad, 12. Arc groove, 13. Limiting strip. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0017] like Figures 1 to 6 As shown, this embodiment provides a connector for the bottom of a rear axle tube, including: Leaf spring 1, composed of several alloy spring plates; rear axle tube 2, which works in conjunction with the vehicle's suspension system during braking; connecting assembly 3, used to fix the rear axle tube 2 above the leaf spring 1, so that the arc-shaped concave surface of the leaf spring 1 faces the rear axle tube 2, effectively shortening the bottom clearance of heavy vehicles, forming a more compact mechanical structure, allowing the impact force to be quickly dispersed to the frame when the vehicle is driving on bumpy roads, reducing stress concentration on individual components, and extending service life; at the same time, its disassembly and assembly parts and leaf spring 1 are located at the bottom, especially for passenger vehicles, after effectively lowering the vehicle body, the chassis is lower, the driving is more stable, it is easier for passengers to get on and off the vehicle, and it can be accurately disassembled and repaired without the need to overturn the vehicle, improving maintenance efficiency.

[0018] The connecting assembly 3 includes a bridge tube connector 4, a square screw 5, and a pressure plate 6. The bridge tube connector 4 has a mating surface 7 and a fixing surface 8. The mating surface 7 is an arc-shaped surface, welded to the upper surface of the rear axle tube 2. The mating surface 7 matches the arc of the rear axle tube 2 surface. The fixing surface 8 has two identical fixing and limiting grooves 9, the shape and arc of which match the shape of the square screw 5. The bridge tube connector 4 has a through-hole 10 on its surface, which effectively increases the heat dissipation between components. The mating surface 7 and the rear axle tube 2 are connected by welding, which effectively enhances the overall installation tightness. The square screw 5 passes sequentially through the bridge tube connector 4, the rear axle tube 2, the leaf spring support pad 11, and both sides of the leaf spring 1, and is tightened with the pressure plate 6. The tight connection of multiple components forms a stable overall structure. This design avoids the dispersion and energy loss of braking force caused by uneven contact surfaces or gaps, ensuring the integrity and stability of braking force transmission. This allows the braking system to respond more quickly to braking commands, improving braking efficiency. During braking, the vehicle generates significant inertial force and braking torque. A stable connection prevents displacement or loosening of the rear axle tube relative to the leaf spring, ensuring that braking force is always accurately transmitted to the wheels along the predetermined path. This avoids braking force deviation caused by unstable connections, thereby improving braking accuracy and reliability.

[0019] The bottom of the leaf spring support pad 11 is tightly attached to the surface of the leaf spring 1, and the top of the leaf spring support pad 11 has an arc-shaped groove 12 that fits with the rear axle tube 2. The rear axle tube 2 and the arc-shaped groove 12 are connected by welding. This structure further enhances the tight connection between the rear axle tube 2 and the leaf spring 1. During braking, the leaf spring support pad 11 and the connecting assembly 3 work together to form a cooperative structural system, which can better bear and distribute the load generated by braking, so that the rear axle can maintain a stable geometric shape and relative position during braking.

[0020] The upper surface of the pressure plate 6 is in contact with the arc-shaped convex surface of the leaf spring 1, and the upper surface of the pressure plate 6 is provided with two parallel limiting strips 13. The width of the leaf spring 1 is the same as the distance between the two limiting strips 13. Since the leaf spring 1 is located at the bottom of the entire structure, the leaf spring 1 is subjected to an upward pulling force in the entire structure. Therefore, the center of gravity of the entire leaf spring 1 is concentrated on the pressure plate 6. When the bus is running and the driver is braking, it is necessary to ensure that the leaf spring 1 does not slide relative to other structures. Therefore, the groove formed by the two limiting strips 13 is used to limit and reinforce the leaf spring 1, ensuring the stability of the leaf spring 1 and the overall structure.

[0021] like Figure 5 As shown in the cross-sectional view, the leaf spring 1 is fixed in the middle by bolts. Therefore, the center of both the pressure plate 6 and the leaf spring support pad 11 is provided with clearance holes to allow installation space for the nuts exposed on both sides of the leaf spring 1.

[0022] All the devices selected in this application (parts whose specific structures are not specified) are general standard parts or parts known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0023] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A leaf spring-loaded under-mount rear axle mounting structure, characterized in that, include: A leaf spring (1) is composed of several alloy spring plates; The rear axle tube (2) works in conjunction with the vehicle suspension system during braking; The connecting component (3) is used to fix the rear axle tube (2) above the leaf spring (1) so that the arc-shaped concave surface of the leaf spring (1) is opposite to the rear axle tube (2); The connecting assembly (3) includes a bridge tube connector (4), a square screw (5), and a pressure plate (6). The bridge tube connector (4) is divided into a mating surface (7) and a fixing surface (8). The mating surface (7) is an arc-shaped surface and is welded to the upper surface of the rear axle tube (2). The mating surface (7) matches the arc of the rear axle tube (2). The fixing surface (8) has two fixing grooves (9) of the same size. The shape and arc of the fixing groove (9) match the shape of the square screw (5). The bridge tube connector (4) has a square hole (10) that runs through the front and back. The square screw (5) passes through the bridge tube connector (4), the rear axle tube (2), the leaf spring support pad (11) and the leaf spring (1) in sequence, and is tightened in cooperation with the pressure plate (6).

2. The leaf spring under-mounted rear axle mounting structure according to claim 1, characterized in that: The bottom of the leaf spring support pad (11) is in close contact with the surface of the leaf spring (1), and the top of the leaf spring support pad (11) is provided with an arc-shaped groove (12) that matches the rear axle tube (2).

3. The leaf spring under-mounted rear axle mounting structure according to claim 2, characterized in that: The upper surface of the pressure plate (6) is in contact with the arc-shaped convex surface of the leaf spring (1), and the upper surface of the pressure plate (6) is provided with two parallel limiting strips (13), and the width of the leaf spring (1) is the same as the distance between the two limiting strips (13).

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