A central normally closed wet drive axle with a multi-section cantilever structure

Abstract

The invention discloses a center normally-closed wet type drive axle with a multi-section cantilever structure. The center normally-closed wet type drive axle comprises an axle housing assembly, a wheel-side reducer, a semi-axle, a wet type brake and a main reducer, wherein the axle housing assembly is assembled by an axle housing and a support shaft; the wheel-side reducer is mounted on the support shaft and connected with one end of the semi-axle, the other end of the semi-axle is connected with the main reducer, the center wet type brake is mounted between the main reducer and the axle housing, and the main reducer is of a double-curved-surface bevel gear pair cantilever structure. The center normally-closed wet type drive axle has the advantages the multi-section housing of the drive axle is even in structure, the overall structure of the housing is roughly cylindrical, maintenance space is enlarged, main machine passing performance is guaranteed under the condition that the overall machine gravity center is low; the main reducer adopts double-curved-surface bevel gear pair cantilever support and is compact in internal structure, and a road roller chassis is low in gravity center; the center normally-closed wet type drive axle is low in part number and low in cost, the wet brake is arranged at the center of the drive axle, wheel-side size is small, and good road roller passing performance is achieved under the condition that the gravity center of the chassis is unchanged.

Description

technical field [0001] The invention relates to a drive axle for construction machinery with a lower center of gravity of the chassis, in particular to a central normally closed wet drive axle with a multi-section cantilever structure. Background technique [0002] As a widely used compaction machine, compaction is one of the important performances of road rollers. To improve the compaction performance, the center of gravity of the chassis of the road roller must be lower than that of other construction machinery, but at the same time, good passability must be ensured. The overall size and structural layout of the drive axle are crucial to the balanced compaction performance and passing performance of the whole machine. [0003] The current wet drive axle is mainly composed of axle housing assembly, final reducer assembly, wheel side reducer assembly, wet brake, half shaft, oil pipe assembly and other parts. The axle housing is an integral structure, and the overall size is...

AI Technical Summary

Problems solved by technology

[0006] 1. The compaction performance of the road roller requires that the chassis of the whole machine should be low, and the layout of the drive axle should be compact. If the axle housing and the main reduction housing are integrated, the large-volume axle package will result in a narrow space for personnel inspection and maintenance.

[0007] 2. The main helical gear in the main reducer is supported by horseback riding. One end of the driving helical gear away from the driven helical gear is supported by two bearings, and the other end is supported by one bearing. The main reducer takes up a lot of space, which will lead to: more complex structure, The total cost is high; under the condition that the roller is kept at a certain height from the ground, the center of gravity of the chassis is high, which affects the mechanical compaction performance

[0008] 3. The wet brake is arranged on the wheel edge, which directly leads to an increase in the size of the wheel rim distribution circle, which increases the center of gravity of the machine and affects the compaction performance; at the same time, the increase in the volume of the wheel edge leads to a low height of the road roller from the ground and poor passability;

[0009] 4. For hydraulically driven construction machinery drive trains, if a normally open wet brake is used, there will be safety hazards: when the hydraulic system fails or the piston seal is damaged, the pressure will be released and the brake will fail; Wear and tear, the piston stroke is not enough to press the friction plate pair after the piston stroke becomes larger, the main and driven plates will slide and grind at high speed, the temperature rises quickly, and the braking force is insufficient

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