Axle housing structure of rear axle of motor tricycle

Abstract

An axle housing structure of a rear axle of a motor tricycle comprises an axle housing provided with a tooth bag, a left axle tube and a right axle tube, the axle housing is integrally manufactured and formed by a metal tube, the tooth bag is arranged in the middle section of the metal tube, a section of opening is cut from the middle section of the metal tube and penetrates through the tube wall in the radial direction, and the opening forms a tooth bag cavity which is through in the front-back direction through stamping. An annular flange plate is welded to the front side of the tooth bag cavity, a tooth bag rear cover is welded to the rear side of the tooth bag cavity to form a tooth bag, and flanges are welded to the extending ends of the left axle tube and the right axle tube respectively.

Description

Technical Field

[0001] The utility model relates to the field of three-wheeled motorcycle accessories, in particular to a bridge housing structure of a rear axle of a three-wheeled motorcycle. Background Art

[0002] The rear axle housing of an existing three-wheeled motorcycle is usually welded together by a left axle tube, an intermediate housing, and a right axle tube to form a housing structure with three axially distributed sections. However, since the left and right axle tubes of the rear axle housing of a three-wheeled motorcycle need to bear the torque of the electric drive axle, and this three-section axle housing of a three-wheeled motorcycle is subject to large torque, the welds of the three axially distributed axle housings are prone to desoldering and cracking, posing a major safety hazard. In addition, the production process of this three-section axle housing is complicated, and the three sections of the housing need to be cast separately and then welded and fixed, which increases production costs. Summary of the Invention

[0003] In view of the above problems, the utility model proposes a bridge housing structure for the rear axle of a three-wheeled motorcycle, which avoids the problem of desoldering and cracking that easily occurs at the welding points of the three-section bridge housing, has a simple structure and is easy to produce.

[0004] The technical solution of the utility model is: a bridge housing structure of the rear axle of a three-wheeled motorcycle, including a bridge housing provided with a tooth pack and left and right bridge tubes, the bridge housing is made of a metal pipe as a whole, the tooth pack is arranged in the middle section of the metal pipe, and an opening is cut from the middle section of the metal pipe to radially penetrate the tube wall, and the opening is formed into a tooth pack cavity that passes through the front and back by stamping, an annular flange is welded on the front side of the tooth pack cavity, and a tooth pack rear cover is welded on the rear side to form a tooth pack, and flanges are welded to the extended ends of the left and right bridge tubes respectively.

[0005] Preferably, the cross-sections of the left and right bridge tubes are both circular or rectangular.

[0006] Preferably, the extended ends of the left and right bridge tubes with circular cross-sections are directly welded to flanges, and the extended ends of the left and right bridge tubes with rectangular cross-sections are respectively necked and then welded to flanges.

[0007] Preferably, reinforcement plates are provided on the front and rear sides of the bridge housing in the directions in which the left and right bridge tubes extend respectively.

[0008] Preferably, the reinforcement plates are symmetrically arranged in a triangular shape and are fixed to the bridge housing by welding.

[0009] The advantages of the present invention are:

[0010] 1. The axle housing of the present invention is made of metal pipes in one piece, without welding seams, thus avoiding the problem of desoldering and cracking that is prone to occur at the welding points of traditional axle housings and enhancing safety.

[0011] 2. Compared with the traditional bridge housing, the utility model reduces the complex process of cutting the plate into sheets, punching them into pieces, stretching them into shape, trimming them, and assembling them into the middle section, and then welding the bridge tubes on both sides, which greatly saves processing costs.

[0012] 3. The utility model is equipped with a reinforcement plate, which not only blocks the cracks opened by the laser, but also increases the strength of the rear axle housing, making it beautiful and elegant. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the main view of the utility model;

[0014] Figure 2 This is a top view of the utility model;

[0015] Figure 3 It is a side view of the utility model. DETAILED DESCRIPTION

[0016] See also Figures 1 to 3 A rear axle housing structure for a three-wheeled motorcycle includes a housing having a threaded sleeve and left and right axle tubes. The housing is integrally formed from a metal tube. The threaded sleeve 1 is disposed in the middle section of the metal tube. A radial opening is cut from the middle section of the metal tube, which is formed by stamping to form a threaded sleeve cavity 3 extending from front to back. An annular flange 2 is welded to the front of the threaded sleeve cavity 3, and a threaded sleeve rear cover 5 is welded to the rear of the threaded sleeve 1. The left and right axle tubes have circular or rectangular cross-sections. The choice of a circular or rectangular cross-section axle tube housing is determined based on the design requirements of the three-wheeled motorcycle. In this embodiment, a rectangular cross-section axle tube is used. The extended ends of the left and right circular cross-section axle tubes are directly welded to flanges 6. The extended ends of the left and right rectangular cross-section axle tubes are necked down and then welded to flanges 6. The necking of the rectangular cross-section axle tubes facilitates subsequent robot welding of the flanges. Therefore, the rectangular ends of the axle tubes are necked down to form circular ends. Reinforcing plates 4 are provided on the front and rear sides of the axle housing, respectively, in the direction in which the left and right axle tubes extend. The reinforcement plates 4 are symmetrically arranged in a triangular shape and are welded to the axle housing. They serve two purposes: 1) to block the laser-cut cracks, sealing the axle housing while maintaining its aesthetic appearance; and 2) to bridge the laser-cut cracks, strengthening the rear axle housing.

[0017] The production process of the bridge shell structure of the rear axle of the three-wheeled motorcycle of the utility model is as follows: first, a section of radial opening penetrating the tube wall is cut out through the middle section of a metal round tube or a metal square tube by laser, and then the opening cut out of the tube is punched through a stamping die. When the stamping die is punching the middle section of the tube, a high-frequency heater is used to heat the tube to prevent the tube from cracking and damaging during the stamping process. After multiple stamping and shaping, a tooth package cavity penetrating the front and rear is formed in the middle section of the tube, and the installation cavity is matched with the stamping die. Then, a punch is used to punch the tube openings at both ends of the tube. Similarly, in order to prevent the stamping process The middle pipe is cracked and damaged, and a high-frequency heater is still used to heat the pipe mouth when punching the pipe mouth. After punching by the punch press, the pipe mouths at both ends of the pipe are shrunk into round mouths, and then flanges are welded at the round mouths at both ends of the pipe by a robot to facilitate the subsequent installation of bolts and other components for fixed connection. In addition, an annular flange is welded on the front side of the tooth package cavity, and a tooth package back cover is welded on the back side. Due to the radial opening through the pipe wall cut by the laser, there will still be openings extending in the direction of the left and right bridge pipes after stamping. In order to form a closed space, a reinforcement plate will be welded at the opening to enhance the strength of the rear axle.

[0018] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications made to the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A rear axle housing structure for a three-wheeled motorcycle, comprising a housing having a threaded sleeve and left and right axle tubes, characterized in that: The bridge housing is integrally formed by metal pipes, the tooth pack (1) is arranged in the middle section of the metal pipe, and an opening is cut from the middle section of the metal pipe to radially penetrate the pipe wall. The opening is punched to form a tooth pack cavity (3) that passes through the front and back. The front side of the tooth pack cavity (3) is welded with an annular flange (2), and the rear side is welded with a tooth pack rear cover (5) to form the tooth pack (1), and the extended ends of the left and right bridge pipes are respectively welded with flanges (6).

2. The rear axle housing structure of a three-wheeled motorcycle according to claim 1, characterized in that: The cross sections of the left and right bridge tubes are both circular or rectangular.

3. The rear axle housing structure of a three-wheeled motorcycle according to claim 2, characterized in that: The extended ends of the left and right bridge tubes with circular cross-sections are directly welded to flanges (6), and the extended ends of the left and right bridge tubes with rectangular cross-sections are respectively necked and welded to flanges (6).

4. The rear axle housing structure of a three-wheeled motorcycle according to claim 1, characterized in that: Reinforcement plates (4) are provided on the front and rear sides of the bridge housing in the directions in which the left and right bridge tubes extend, respectively.

5. The rear axle housing structure of a three-wheeled motorcycle according to claim 4, characterized in that: The reinforcing plates (4) are symmetrically arranged in a triangular shape and are fixed to the bridge housing by welding.

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