Maintenance-free lightweight middle-rear axle assembly

Abstract

The utility model relates to the technical field of automobile rear axles, in particular to a maintenance-free light-weight middle-rear axle assembly which comprises an axle housing made of alloy steel, the axle housing comprises a gear bag body, a pipe body and a shaft pipe, and the gear bag body is provided with a differential mechanism, a gear box and a flange shaft connected with a transmission shaft; the axle tube is rotatably connected with a hub through an inner bearing and an outer bearing, an elastic spacer bush with two ends abutting against inner rings of the two bearings is arranged between the inner bearing and the outer bearing, the axle tube is in threaded connection with a locking nut for locking the two bearings, and a framework oil seal is arranged on the outer side of the inner bearing. According to the rear axle assembly, the axle housing is made of alloy steel, so that the thickness of the axle housing can be reduced, the weight of the axle housing is reduced, the axle housing is integrated with a plurality of modules, the space utilization rate is increased, space support is provided for the space layout and light weight of a whole vehicle, the elastic spacer bush can compensate the clearance after the gear is abraded, and the service life of the whole vehicle is prolonged. The service life of the wheel end is prolonged, and the maintenance frequency is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile rear axles, in particular to a maintenance-free lightweight middle and rear axle assembly. Background Art

[0002] As the most important component of a load-carrying vehicle, the center and rear axle play the role of structural support and power transmission. Its operating conditions are complex and harsh, especially the rotating parts, which bear large pressure and have high speed. In addition, because load-carrying vehicles often need to operate under load for a long time, it has a huge impact on the lubricating oil (grease) and sealing structure, causing their performance to decline, and then causing the rotating mechanism to wear. Therefore, the center and rear axle components have become components that are frequently maintained in the vehicle. Each maintenance of the center and rear axle is not only costly, but also difficult to maintain, and often safety accidents are caused by untimely maintenance. Therefore, increasing the operating life of the center and rear axle mechanism and thus reducing the maintenance frequency are of great significance to vehicle operation safety and reducing the cost of use. Utility Model Content

[0003] The purpose of the utility model is to provide a maintenance-free lightweight center and rear axle assembly to address the deficiencies of the prior art, which reduces the vehicle operating load and failure probability through lightweight and modularization, adopts a scientific structure to prevent wheel hub bearing movement, and adopts high-quality lubricating oil and skeleton seals to prevent mud and water from entering the rotating components, thereby reducing wear and extending the continuous operation life of the rear axle.

[0004] The utility model solves the technical problem by adopting the following technical scheme: a maintenance-free lightweight center-rear axle assembly, comprising a bridge housing made of alloy steel, the bridge housing comprising a middle threaded body, a tube body integrally formed with the threaded body at two ends, and an axle tube welded to the tube body on the outside, the threaded body is provided with a differential, a gear box driving the differential to rotate, and a flange shaft connected to a transmission shaft for providing power to the gear box; a damping seat and a leaf spring seat are respectively welded on the upper and lower sides of a square tube section of the tube body, and a brake mechanism is fixed on a round tube section of the tube body; the axle tube is rotatably connected with a wheel hub carrying a brake drum and a wheel rim through an inner bearing and an outer bearing, the wheel hub is connected with a differential gear through a half shaft, an elastic spacer with two ends abutting against two inner rings of the bearings is provided between the inner bearing and the outer bearing, the axle tube is threadedly connected with a locking nut for locking two bearings, and a skeleton oil seal is provided on the outside of the inner bearing; a camshaft tube is fixed to the chassis of the brake mechanism, and the camshaft tube is provided with an air chamber through a fixed air chamber frame.

[0005] Preferably, the shaft body of the flange shaft is tubular, a spline is arranged inside the tubular shaft body of the flange shaft, and a flange connection surface of the flange shaft is provided with a pattern for increasing friction.

[0006] Preferably, the elastic spacer is a tube body made of spring steel, the diameter of the tube opening at one end of the tube body of the elastic spacer is reduced, and the tube body is smoothly connected to other parts through a tapered tube.

[0007] Preferably, the tapered tube length of the elastic spacer is ≥20 mm, and the slope is 30°.

[0008] Preferably, the skeleton oil seal is a structure with a labyrinth-like inner cavity, multiple lips, and wavy inner and outer circumferential surfaces.

[0009] The utility model has the following beneficial effects: a maintenance-free lightweight center-rear axle assembly, comprising a bridge housing made of alloy steel, the bridge housing comprising a middle threaded body, a tube body integrally formed with the threaded body at both ends, and an axle tube welded to the tube body on the outside, the threaded body being provided with a differential, a gear box driving the differential to rotate, and a flange shaft connected to a transmission shaft for providing power to the gear box; a damping seat and a leaf spring seat are welded to the upper and lower sides of a square tube section of the tube body, respectively, and a brake mechanism is fixed to a round tube section of the tube body; the axle tube is rotatably connected to a wheel hub carrying a brake drum and a wheel rim through an inner bearing and an outer bearing, the wheel hub is connected to a differential gear through a half shaft, an elastic spacer with two ends abutting against two inner rings of the bearings is provided between the inner bearing and the outer bearing, the axle tube is threadedly connected with a locking nut for locking two bearings, and a skeleton oil seal is provided on the outside of the inner bearing; a camshaft tube is fixed to the chassis of the brake mechanism, and the camshaft tube is provided with an air chamber through a fixed air chamber frame. The rear axle assembly of the utility model uses alloy steel to make the bridge housing, so that the thickness of the bridge housing can be thinned to reduce the weight of the bridge housing. The bridge housing integrates multiple modules, such as a gear box for deceleration, a vibration damping seat and a leaf spring seat for installing a vibration damping system, and a brake system to increase space utilization, thereby providing space support for the space layout and lightweight of the entire vehicle. The elastic spacer can compensate for the clearance after gear wear and increase the service life of the wheel end, thereby reducing the frequency of maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a three-dimensional diagram of a maintenance-free lightweight middle and rear axle assembly of the utility model;

[0011] Figure 2 Schematic diagram of the wheel hub and its sealing structure.

[0012] Description of reference numerals:

[0013] 1——bridge housing, 2——gearbox, 3——flange shaft, 4——vibration damper seat, 5——leaf spring seat, 6——brake mechanism, 7——wheel hub, 8——inner bearing, 9——outer bearing, 10——elastic spacer, 11——locking nut, 12——skeleton oil seal, 13——camshaft tube. DETAILED DESCRIPTION

[0014] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the scope of implementation of the present invention is not limited thereto.

[0015] like Figure 1 , 2 As shown, a maintenance-free lightweight center-rear axle assembly of the present embodiment includes a bridge housing 1 made of alloy steel, the bridge housing 1 includes a middle tooth package, a tube body integrally formed with the tooth package at both ends, and an axle tube welded to the tube body on the outside, the tooth package is provided with a differential, a gear box 2 for driving the differential to rotate, and a flange shaft 3 connected to the transmission shaft for providing power to the gear box 2; a damping seat 4 and a leaf spring seat 5 are welded on the upper and lower sides of the square tube section of the tube body, respectively, and a brake is fixed on the round tube section of the tube body. Mechanism 6; the shaft tube is rotatably connected to a wheel hub 7 that carries a brake drum and a rim through an inner bearing 8 and an outer bearing 9; the wheel hub 7 is connected to a differential gear through a half shaft; an elastic spacer 10 is provided between the inner bearing 8 and the outer bearing 9, with both ends abutting against the inner rings of two bearings; the shaft tube is threadedly connected to a locking nut 11 for locking the two bearings; a skeleton oil seal 12 is provided on the outer side of the inner bearing 8; a camshaft tube 13 is fixed to the chassis of the brake mechanism 6; the camshaft tube 13 is provided with an air chamber through a fixed air chamber frame.

[0016] The present embodiment is a driving rear axle assembly of a multi-drive commercial vehicle, wherein the coaxial flange shaft 3 is provided on the front and rear surfaces of the tooth package, and the gear box 2 is provided with a clutch; the bridge housing 1 of the rear axle assembly is made of alloy steel by casting and forging, which can reduce the thickness of the bridge housing 1 and thus reduce the weight; the vibration damping seat 4 and the leaf spring seat 5 are welded together with the bridge housing 1, and the weight is reduced by removing the connecting bolts, and the failure rate can be reduced at the same time; the brake mechanism 6 is a drum brake, and the camshaft seat of the chassis used to fix the camshaft is lengthened into a tubular shape, and an air chamber frame is provided on the tubular camshaft tube 13, and the air chamber is installed on the air chamber frame, so that the brake system can be pre-installed as a module, and then assembled when the rear axle assembly is assembled, and the air chamber frame is fixed together with the camshaft tube 13, which makes it easier to position the air chamber and the swing arm at the end of the camshaft, and facilitates the connection between the two.

[0017] As the wheel end with the highest maintenance frequency, an elastic spacer 10 is arranged between the two bearings supporting the wheel hub 7, and a locking nut 11 with a preload is arranged on the outside of the bearing. When the bearing is worn, the elastic spacer 10 with a Z-shaped axial section releases the tensor to compensate for the clearance of the bearing, thereby reducing the wear rate of the bearing; in addition, the skeleton oil seal 12 is a structure with a labyrinth-type inner cavity, multiple lips, and wavy inner and outer circumferential surfaces, which can effectively prevent sewage and mud from entering, thereby avoiding the wear of rotating parts due to external forces.

[0018] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, and for the convenience of describing the technical solution, the front, rear, left, right, top, middle, and bottom directions adopted are based on the settings in the accompanying drawings, rather than limiting the protection scope of the utility model. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the utility model.

Claims

1. A maintenance-free lightweight mid-rear axle assembly, characterized by: It comprises a bridge housing made of alloy steel, the bridge housing comprises a threaded body in the middle, a tube body integrally formed with the threaded body at both ends, and an axle tube welded to the tube body on the outside, the threaded body is provided with a differential, a gear box driving the differential to rotate, and a flange shaft connected to the transmission shaft for providing power for the gear box; a damping seat and a leaf spring seat are welded on the upper and lower sides of the square tube section of the tube body, respectively, and a brake mechanism is fixed on the round tube section of the tube body; the axle tube is rotatably connected to a wheel hub carrying a brake drum and a rim through an inner bearing and an outer bearing, the wheel hub is connected to the differential gear through a half shaft, an elastic spacer with two ends abutting against the inner rings of two bearings is provided between the inner bearing and the outer bearing, the axle tube is threadedly connected with a locking nut for locking the two bearings, and a skeleton oil seal is provided on the outside of the inner bearing; a camshaft tube is fixed to the chassis of the brake mechanism, and the camshaft tube is provided with an air chamber through a fixed air chamber frame.

2. The maintenance-free lightweight mid-rear axle assembly according to claim 1, characterized in that: The shaft body of the flange shaft is tubular, a spline is arranged in the tubular shaft body of the flange shaft, and a pattern for increasing friction is arranged on the flange connection surface of the flange shaft.

3. The maintenance-free lightweight mid-rear axle assembly according to claim 1 is characterized in that: The elastic spacer is a tube body made of spring steel. The diameter of the tube opening at one end of the tube body of the elastic spacer is reduced and is smoothly connected with other parts through a tapered tube.

4. The maintenance-free lightweight mid-rear axle assembly according to claim 3 is characterized in that: The tapered tube length of the elastic spacer is ≥20 mm, and the slope is 30°.

5. The maintenance-free lightweight mid-rear axle assembly according to claim 1 is characterized in that: The skeleton oil seal is a structure with a labyrinth-type inner cavity, multiple lips, and wavy inner and outer circumferential surfaces.

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