Rear axle structure of motor tricycle

Abstract

The utility model discloses a rear axle structure of a motor tricycle. The rear axle structure comprises a rear axle and a main speed reducer. The rear axle is integrally formed by stamping a rectangular tube to form a tooth bag for accommodating the differential mechanism and an axle tube for supporting the half axle, so that the problem of weld joints is avoided, and the overall strength and reliability are improved. The tooth bag is connected with a main speed reducer through a flange, a flange is welded and installed at the outer end of the axle tube, the flange fixes a brake bottom plate through six fastening bolts, the distance between the bolts and the axis is 100-110 mm, and the brake stability is enhanced. The main speed reducer comprises an integrally-cast speed reducer shell, a speed reducing mechanism is arranged in the speed reducer shell, a shaft hole for supporting an input gear shaft is formed in the front end of the shell, design is simplified, assembly errors are avoided, and the strength of the shell is enhanced through reinforcing ribs. In addition, the speed reducing mechanism is provided with a gear shifting support, a gear shifting shaft and a gear locking structure, and operation is reliable. The structure improves the strength of the rear axle, the braking safety and the power transmission efficiency, and is suitable for motor tricycles.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of three -wheel motorcycles, concretely relates to a rear axle structure of three -wheel motorcycle. BACKGROUND

[0002] The rear axle is an important core component of the three -wheel motorcycle, and its main functions include connecting the rear wheel, supporting the vehicle body and realizing the driving of the whole vehicle. As a key component of the rear axle of the three -wheel motorcycle, the rear axle is usually equipped with half shafts, main reducers and other core structures inside, and the outside plays the role of bearing the vehicle body and transmitting the load. At the same time, the rear axle also needs to bear the reaction force and counter torque of the traction force, braking force, lateral force and vertical force from the driving wheel, and transmit these forces to the frame or vehicle body through the suspension system to ensure the stability and driving performance of the whole vehicle. Specifically, the rear axle of the three -wheel motorcycle is mainly composed of a tooth package and axle pipes at both ends of the tooth package. The tooth package is used for installing the main reducer, and the axle pipe is provided with a half shaft. One end of the half shaft is connected to the output shaft of the main reducer reduction mechanism, and the other end is connected to the hub.

[0003] In the traditional rear axle structure of the three -wheel motorcycle, as shown in Figure 1 , the tooth package and the axle pipes at both ends are usually separately made and formed into one body by welding. For example, CN212377253U discloses a three -wheel motorcycle main reducer brake rear axle assembly. The tooth package of this three -wheel motorcycle main reducer brake rear axle is respectively welded with left and right axle pipes at both ends. However, this structure has many problems in actual use, including leakage at the welding position, welding thermal deformation, insufficient welding strength, etc. In addition, when bearing the load, the welding position is prone to bending deformation, resulting in poor durability.

[0004] At the same time, the four fastening bolts 5 for installing the brake bottom plate 3 on the mounting flange welded at the outer end of the axle pipe have a distance of about 88mm from the axis of the brake bottom plate 3. Due to the small number of fastening bolts 5 and the short distance between the axis of the mounting flange and the axis of the brake bottom plate 3, the brake bottom plate is prone to deformation during braking, and the fastening bolts are prone to loosening, which may cause brake failure and safety accidents.

[0005] In addition, as shown in Figure 2 , the reducer housing of the traditional rear axle is composed of a reducer housing 6 and an input shaft bearing seat 7 through assembly connection. The reducer housing 6 and the input shaft bearing seat 7 are separately made and formed. Since the input shaft bearing seat 7 needs to be connected and fixed by a plurality of fastening bolts, assembly connection is prone to cause assembly error between the input shaft bearing seat 7 and the reducer housing 6, resulting in deviation of the meshing between the input shaft angular tooth and the input driven tooth, which may accelerate the wear of the gear and reduce the power transmission efficiency of the whole vehicle. SUMMARY

[0006] The utility model discloses a rear axle structure of three -wheel motorcycle, which is formed by stamping a rectangular tube, avoids the welding seam between the tooth pack and the axle tube, increases the structural strength of the rear axle of the three -wheel motorcycle, increases the number of fastening bolts and the distance between the fastening bolts and the brake bottom plate, reduces the possibility of deformation of the brake bottom plate and loosening of the fastening bolts during braking, and is provided with an axle hole for supporting an input gear shaft at the front end of the speed reducer housing, thereby eliminating the need for installing an input shaft bearing seat.

[0007] The utility model discloses a rear axle structure of three -wheel motorcycle, which is formed by stamping a rectangular tube, avoids the welding seam between the tooth pack and the axle tube, increases the structural strength of the rear axle of the three -wheel motorcycle, increases the number of fastening bolts and the distance between the fastening bolts and the brake bottom plate, reduces the possibility of deformation of the brake bottom plate and loosening of the fastening bolts during braking, and is provided with an axle hole for supporting an input gear shaft at the front end of the speed reducer housing, thereby eliminating the need for installing an input shaft bearing seat.

[0008] A rear axle structure of three -wheel motorcycle, which comprises a three -wheel motorcycle rear axle and a main speed reducer.

[0009] The three -wheel motorcycle rear axle is integrally formed by stamping a rectangular tube and comprises a tooth pack for accommodating a differential and an axle tube for supporting a half shaft, the axle tube is located at the left and right ends of the tooth pack, the rear part of the tooth pack is fixedly connected with a rear cover, and the front part of the tooth pack is connected with the main speed reducer through a flange.

[0010] The main speed reducer comprises an integrally cast speed reducer housing, a speed reduction mechanism arranged in the speed reducer housing, an axle hole for supporting an input gear shaft arranged at the front end of the speed reducer housing, an outer extension end of the input gear shaft of the speed reduction mechanism extending out of the axle hole, a connecting flange fixedly connected to the outer extension end, the connecting flange being used for connecting a transmission shaft, and a flange disc arranged at the rear end of the speed reducer housing and used for connecting with the flange of the tooth pack.

[0011] Preferably, the tooth pack inner cavity is formed by expanding the rectangular hole formed in the middle part of the front and rear sides of the rectangular tube, the tooth pack inner cavity comprises a circular cavity and a polygonal cavity, the circular cavity is located in the middle part of the tooth pack, and the left and right ends of the circular cavity are communicated with the polygonal cavities.

[0012] Preferably, a cover plate is welded at the cavity opening of the polygonal cavity.

[0013] Preferably, the shift shaft of the speed reduction mechanism extends out of the speed reducer housing and is connected with a shift arm through a shift support, and the upper end of the shift support is provided with a folded edge.

[0014] Preferably, two through holes are arranged on the folded edge, one end of each of two lock levers passes through one of the through holes, and the other end of each of the lock levers is movably connected with the shift arm, a gear lock spring is sleeved on each of the lock levers, and the gear lock spring is located between the shift arm and the folded edge.

[0015] Preferably, the outer periphery of the shaft hole supporting the input gear shaft is provided with a plurality of reinforcing ribs extending towards the rear end of the speed reducer housing.

[0016] Preferably, the mounting flange is fixedly connected with the brake bottom plate by six fastening bolts.

[0017] Preferably, the tooth pack side wall is provided with an oil drainage hole.

[0018] The utility model discloses the beneficial effects are as follows:

[0019] 1. The rear axle structure strength of three-wheeled motorcycle is promoted, and the welding seam between the tooth pack and the axle pipe is avoided by the design that the rear axle of three-wheeled motorcycle is integrally formed by stamping a rectangular pipe, welding defects such as cracks and leakage are reduced, and the overall strength and reliability of the rear axle are improved.

[0020] 2. The brake system stability is enhanced, the mounting flange welded at the outer end of each axle pipe is fixed with the brake bottom plate by six fastening bolts, and the axial distance between the fastening bolt and the mounting flange is increased to 100-110mm, which is greater than the axial distance between the fastening bolt of the traditional brake bottom plate and the mounting flange, the compression area of the brake bottom plate and the mounting flange is increased due to the increased axial distance between the fastening bolt and the axle, the deformation of the brake bottom plate is reduced, the braking effect of the brake system is improved, and the driving safety is improved.

[0021] 3. The assembly error of the input shaft bearing seat and the speed reducer housing is avoided, the speed reducer housing is provided with a shaft hole for supporting the input gear shaft, the input shaft bearing seat is not needed to be separately arranged, the structure design is simplified, the assembly error is avoided, the meshing precision of the speed reduction mechanism is improved, the gear wear is reduced, and the service life of the parts is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a schematic view of the rear axle structure of the prior art three-wheeled motorcycle;

[0023] Figure 2 It is a schematic view of the main speed reducer structure of the prior art;

[0024] Figure 3 It is a schematic view of the structure of the utility model;

[0025] Figure 4 It is a schematic view of the rear axle structure of the three-wheeled motorcycle of the utility model. DETAILED DESCRIPTION

[0026] As Figures 1 to 4As shown, a rear axle structure of a three-wheeled motorcycle comprises a three-wheeled motorcycle rear axle, a main speed reducer; the three-wheeled motorcycle rear axle is integrally formed by stamping a rectangular tube with a tooth pack 11 for accommodating a differential and an axle tube 12 for supporting a half shaft 50, i.e. long rectangular holes are formed in the middle of the front and rear sides of the rectangular tube, the long rectangular holes are expanded to the tooth pack 11 by stamping, the tooth pack 11 and the axle tube 12 are processed from a rectangular tube, and there is no welding seam in the axial direction, the differential is connected to the main speed reducer, the axle tube 12 is located at the left and right ends of the tooth pack 11, and the tooth pack 11 and the axle tube 12 are integrally formed by stamping the rectangular tube, which avoids the welding seam defects caused by the welding process in the traditional structure, reduces the structural fatigue points, and reduces the production cost.

[0027] The tooth pack 11 is fixedly connected with a rear cover 13 at the rear part, and the tooth pack 11 is connected with the main speed reducer through a flange at the front part, a tooth pack inner cavity 14 of the tooth pack 11 is formed by expanding the long rectangular hole formed in the middle of the rectangular tube, the tooth pack inner cavity 14 comprises a circular cavity 141 and a polygonal cavity 142, the circular cavity 141 is located in the middle of the tooth pack 11, the left and right ends of the circular cavity 141 are communicated with the polygonal cavity 142, and the circular cavity 141 and the polygonal cavity 142 are both formed by expanding the long rectangular hole; a cover plate 15 is welded at the cavity opening of the polygonal cavity 142, the cover plate 15 is made of metal, the flange plate of the rear cover 13, the reducer housing 20 and the cover plate 15 collectively cover the opening of the tooth pack inner cavity 14, and form a sealed cavity with the tooth pack inner cavity 14, and an oil drain hole 111 is formed in the side wall of the tooth pack 11, which can also serve as a vent hole.

[0028] An installation flange 33 is welded at the outer end of each axle tube 12, the installation flange 33 is fixedly connected with a brake bottom plate 31 of a drum brake through a plurality of fastening bolts 32, the distance between each fastening bolt 32 and the axis of the installation flange 33 is 100-110 mm, the fastening bolts 32 are six, and the installation flange 33 is fixedly connected with the brake bottom plate 31 through the six fastening bolts 32.

[0029] The inner end of the half shaft 50 is engaged with a differential half shaft gear, and the outer end of the half shaft 50 is connected with a hub 30.

[0030] The main speed reducer comprises a reducer housing 20 integrally formed by casting, a speed reduction mechanism arranged in the cavity of the reducer housing 20, an axle hole 22 for supporting an input gear shaft 21 is arranged at the front end of the reducer housing 20, the input gear shaft 21 of the speed reduction mechanism is supported in the axle hole 22 through a bearing, the outer end of the input gear shaft 21 protrudes out of the axle hole 22, a connecting flange 211 is fixedly connected to the outer end, the connecting flange 211 is used for connecting a transmission shaft, and a driving bevel gear at the inner end of the input gear shaft 21 is engaged with a driven bevel gear of the speed reduction mechanism.

[0031] The outer periphery of the shaft hole 22 supporting the input gear shaft 21 is provided with a plurality of reinforcing ribs 23 extending towards the rear end of the speed reducer housing 20, and the rear end of the speed reducer housing 20 is provided with a flange plate for connecting with the flange of the connecting tooth pack 11; one side of the speed reducer housing 20 is provided with a gear shifting support 41, the gear shifting shaft 40 of the speed reduction mechanism extends out of the speed reducer housing 20 and connects with the gear shifting arm 42 through the gear shifting support 41, the upper end of the gear shifting support 41 is provided with a folded edge 411, two through holes are arranged on the folded edge 411, and one end of each of the two lock shifting rods 43 passes through one of the through holes and the other end is movably connected with the gear shifting arm 42, the gear shifting rod 43 is sleeved with a gear position locking spring 431, the gear position locking spring 431 is located between the gear shifting arm 42 and the folded edge 411, and a cable fixing column is arranged on the gear shifting arm 42 and offset from the gear shifting shaft 40 for connecting with the gear shifting control cable.

[0032] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application, and any modification made by those skilled in the art without departing from the spirit of the present application falls within the protection scope of the present application.

Claims

1. A rear axle structure of a three-wheeled motorcycle, comprising a three-wheeled motorcycle rear axle, a main speed reducer, characterized in that: the three-wheeled motorcycle rear axle is integrally formed by stamping a rectangular tube with a differential housing (11) for accommodating a differential and axle pipes (12) for supporting half shafts (50), the axle pipes (12) are located at the left and right ends of the differential housing (11), the rear part of the differential housing (11) is fixedly connected with a rear cover (13), and the front part of the differential housing (11) is connected with the main speed reducer through a flange; the outer end of each axle pipe (12) is welded with a mounting flange (33), the mounting flange (33) is fixedly connected with a brake bottom plate (31) through a plurality of fastening bolts (32), and the distance between each fastening bolt (32) and the axis of the mounting flange (33) is 100-110 mm; the main speed reducer comprises a reducer housing (20) integrally cast, the reducer housing (20) is provided with a speed reduction mechanism in the cavity, the front end of the reducer housing (20) is provided with a shaft hole (22) for supporting an input gear shaft (21), the outer end of the input gear shaft (21) of the speed reduction mechanism protrudes out of the shaft hole (22), a connecting flange (211) is fixedly connected to the outer end, the connecting flange (211) is used for connecting a transmission shaft, and the rear end of the reducer housing (20) is provided with a flange plate for flange connection with the differential housing (11).

2. The rear axle structure of a three-wheeled motorcycle according to claim 1, characterized in that: the differential housing (11) is formed by hole expansion of a rectangular hole formed in the middle of the front and rear sides of the differential housing (11), the differential housing (11) comprises a circular cavity (141) and a polygonal cavity (142), the circular cavity (141) is located in the middle of the differential housing (11), and the left and right ends of the circular cavity (141) are communicated with the polygonal cavities (142).

3. The rear axle structure of a three-wheeled motorcycle according to claim 2, characterized in that: a cover plate (15) is welded at the cavity opening of the polygonal cavity (142).

4. The rear axle structure of a three-wheeled motorcycle according to claim 1, characterized in that: the shift shaft (40) of the speed reduction mechanism protrudes out of the reducer housing (20) and is connected with a shift arm (42) through a shift support (41), and the upper end of the shift support (41) is provided with a folded edge (411).

5. The rear axle structure of a three-wheeled motorcycle according to claim 4, characterized in that: two through holes are formed in the folded edge (411), two lock levers (43) pass through one through hole at one end and are movably connected with the shift arm (42) at the other end, a gear lock spring (431) is sleeved on each lock lever (43), and the gear lock spring (431) is located between the shift arm (42) and the folded edge (411).

6. The rear axle structure of a three-wheeled motorcycle according to claim 1, characterized in that: a plurality of reinforcing ribs (23) extending towards the rear end of the reducer housing (20) are arranged on the outer periphery of the shaft hole (22) for supporting the input gear shaft (21).

7. The rear axle structure of a three-wheeled motorcycle according to claim 1, characterized in that: the fastening bolts (32) are six, and the mounting flange (33) is fixedly connected with the brake bottom plate (31) through the six fastening bolts (32).

8. The rear axle structure of a three-wheeled motorcycle according to claim 1, characterized in that: an oil drain hole (111) is formed in the side wall of the differential housing (11).

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