A gearbox for a motor tricycle

Abstract

The utility model provides a kind of gearbox of electric tricycle, including box, box is by left box and right box and is spliced by multiple screws;Differential assembly is equipped in box, left half portion in left box is equipped with left drive half shaft, right half portion in right box is equipped with right drive half shaft, left drive half shaft and right drive half shaft are connected with the transmission end of differential assembly;Left drive half shaft is symmetrical to right drive half shaft setting, and its axial direction with the axial direction of right drive half shaft is on same straight line;Bearing, bearing end cover and first oil seal are equipped on left drive half shaft and right drive half shaft, bearing end cover is fixed on bearing, first oil seal is fixed on bearing end cover;Left box upper half portion middle region is concave downward and forms circular recess, and the center of circular recess is equipped with a shaft component;One end of a shaft component is used to connect motor, and the other end is used to connect the drive end of differential assembly.The utility model reduces gear and bearing wear, prevents oil leakage, improves work stability.

Description

Technical Field

[0001] This utility model relates to the field of gearbox technology, and in particular to a gearbox for an electric tricycle. Background Technology

[0002] The gearbox of an electric tricycle amplifies the torque of the drive motor by switching gear sets with different transmission ratios, thus adapting to different usage scenarios such as vehicle starting, loading, and climbing. The gearbox transmission module consists of parallel-arranged input shaft, intermediate shaft, output shaft, and multiple sets of gears. During operation, it is driven by the motor to engage different gears with the shafts, changing the power transmission path and reduction ratio, and realizing the switching between multiple gears.

[0003] The main problems with existing electric tricycle transmissions are mechanical wear and fluid leakage. Wear, slippage, and breakage of gears will prevent power transmission, causing the vehicle to idle without moving; damaged bearings will also cause abnormal noises and unstable driving. Transmission fluid leakage will exacerbate internal wear; insufficient fluid or poor quality fluid will lead to poor lubrication, causing the transmission to overheat and affecting normal vehicle operation.

[0004] Therefore, for electric tricycles, how to design a gearbox that can reduce gear and bearing wear, prevent oil leakage, and improve operational stability is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a gearbox for an electric tricycle.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A gearbox for an electric tricycle includes a housing, which is composed of a left housing and a right housing joined together by multiple screws. A differential assembly is housed within the housing. A left drive shaft is located in the lower half of the left housing, and a right drive shaft is located in the lower half of the right housing. Both the left and right drive shafts are connected to the drive end of the differential assembly. The left drive shaft is symmetrically arranged to the right drive shaft, and its axial direction is aligned with that of the right drive shaft. Bearings, bearing end caps, and a first oil seal are provided on both the left and right drive shafts. The bearing end cap is fixed to the bearing, and the first oil seal is fixed to the bearing end cap. The upper half of the left housing has a downwardly recessed central area forming a circular groove. A shaft component is located at the center of the circular groove. One end of the shaft component is used to connect to a motor, and the other end is used to connect to the drive end of the differential assembly.

[0008] Furthermore, the outer diameter of the bearing end cover is larger than the outer diameter of the bearing, and the outer diameter portion of the bearing end cover is provided with a retaining ring for holes, the two end faces of which are respectively attached to the bearing and the first oil seal.

[0009] Furthermore, dust covers are provided on both the left and right drive shafts; the dust covers are installed on the inner circumference of the first oil seal, and their end faces are annularly attached to the end face of the first oil seal.

[0010] Furthermore, a second oil seal is provided in the circular groove, and the second oil seal is press-fitted between the inner circumference of the circular groove and the shaft component.

[0011] Furthermore, a positioning pin is provided at the bottom of the box, and the positioning pin passes through the splicing end of the bottom of the left box and the right box.

[0012] Furthermore, an air vent cap assembly and an oil plug assembly are respectively provided on both sides of the housing; one end of the air vent cap assembly can be rotated open, and the other end is fixed to the splicing end on one side of the left housing and the right housing, and is connected to the oil inlet end of the oil circuit inside the housing; one end of the oil plug assembly can also be rotated open, and the other end is fixed to the splicing end on the other side of the left housing and the right housing, and seals the end of the oil circuit inside the housing.

[0013] Furthermore, the screws are evenly distributed from top to bottom along the edge of the right housing, forming a pear-shaped structure that is narrower at the top and wider at the bottom.

[0014] Compared with the prior art, this utility model has the following technical advantages:

[0015] 1. By placing a retaining ring in the outer diameter of the bearing end cover, the bearing is prevented from moving axially along the left and right drive shafts, while also bearing a portion of the axial load from the bearing, ensuring the bearing remains stable during operation and thus reducing bearing wear.

[0016] 2. By setting up the first and second oil seals, oil leakage protection is achieved at both the power input and power output ends of the transmission, improving reliability.

[0017] 3. When the left and right gearboxes are joined, the positioning pins are first used to position the gearboxes by interlocking with them, thus improving the accuracy of the joint. During operation, the positioning pins can also play a certain limiting role at the bottom of the gearbox after they are fixed, reducing the transmission error between the left and right gearboxes and thus reducing gear wear.

[0018] 4. The screws are evenly distributed from top to bottom along the edge of the right housing, forming a pear-shaped structure that is narrower at the top and wider at the bottom. This arrangement fixes the right housing to the left housing, and when the gearbox is working, each screw is subjected to uniform force, which, together with the locating pin, makes the splicing more secure. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the right side structure of this utility model;

[0020] Figure 2 yes Figure 1 AA section view;

[0021] Figure 3 yes Figure 2 Enlarged view of section B;

[0022] Figure 4 This is a schematic diagram of the left side structure of this utility model;

[0023] Figure 5 This is a schematic diagram of the top structure of this utility model.

[0024] In the diagram: 100, gearbox housing; 110, left gearbox housing; 111, left drive half-shaft; 112, circular groove; 113, first shaft assembly; 120, right gearbox housing; 121, right drive half-shaft; 130, screw; 140, bearing; 150, bearing end cover; 161, first oil seal; 162, second oil seal; 170, retaining ring for the hole; 180, dust cover; 190, locating pin; 2, differential assembly; 3, exhaust cap assembly; 4, oil plug assembly. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. It should be noted that, unless otherwise expressly specified and limited, the terms "installation", "connection", and "setting" should be interpreted broadly. For those skilled in the art, the specific meaning of the above terms in this patent can be understood according to the specific circumstances.

[0026] like Figures 1-5As shown, this utility model provides a gearbox for an electric tricycle, including a housing 100, which is assembled from a left housing 110 and a right housing 120 by multiple screws 130. A differential assembly 2 is housed within the housing 100. A left drive shaft 111 is located in the lower half of the left housing 110, and a right drive shaft 121 is located in the lower half of the right housing 120. Both the left and right drive shafts 111 and 121 are connected to the drive end of the differential assembly 2. The left drive shaft 111 is symmetrically positioned to the right drive shaft 121, and its axial direction is aligned with that of the right drive shaft 121. Bearings 140, bearing end caps 150, and first oil seals 160 are provided on both the left and right drive shafts 111 and 121. The bearing end cap 150 is fixed to the bearing 140, and the first oil seal 160 is fixed to the bearing end cap 150. The upper half of the left housing 110 has a recessed middle area that forms a circular groove 112, and a shaft component 113 is located at the center of the circular groove 112. One end of the shaft component 113 is used to connect to the motor, and the other end is used to connect to the drive end of the differential assembly 2.

[0027] Understandably, the differential assembly 2 is driven by a motor, and its drive end consists of an input shaft, an intermediate shaft, and multiple gears. The shaft component 113 is a transmission component that connects the input shaft and the motor. The left drive half-shaft 111 and the right drive half-shaft 121 form the output shaft of the gearbox, and the output is controlled by the differential assembly 2 under the drive of the motor.

[0028] like Figures 2-3 As shown, the outer diameter of the bearing end cover 150 is larger than the outer diameter of the bearing 140. A retaining ring 170 is provided in the outer diameter portion of the bearing end cover 150, with its two end faces respectively fitting against the bearing 140 and the first oil seal 160. The retaining ring 170 is an elastic component used to fix the axial position of the bearing 140 in the left drive half-shaft 111 and the right drive half-shaft 121. By providing the retaining ring 170 in the outer diameter portion of the bearing end cover 150, axial movement of the bearing 140 along the left drive half-shaft 111 and the right drive half-shaft 121 is prevented, while also bearing a portion of the axial load from the bearing 140, ensuring the bearing 140 remains stable during operation and thus reducing bearing wear.

[0029] Dust covers 180 are also provided on both the left drive half-shaft 111 and the right drive half-shaft 121. The dust cover 180 is installed on the inner circumference of the first oil seal 111, and its end face is annularly fitted to the end face of the first oil seal 111. The dust cover 180 serves to prevent external dust from entering the gearbox. After installation, the contact surface between it and the inner circumference of the first oil seal 111 is subjected to stress, thus the dust cover 180 is firmly fixed to the first oil seal 111 and is not easy to fall off naturally.

[0030] like Figure 2 and Figure 4As shown, a second oil seal 162 is also provided in the circular groove 112. The second oil seal 162 is press-fitted between the inner circumference of the circular groove 112 and the shaft component 113. With the provision of the first oil seal 161 and the second oil seal 162, oil leakage protection is achieved at both the power input and power output ends of the gearbox, improving reliability.

[0031] like Figure 2 As shown, a positioning pin 190 is provided at the bottom of the gearbox 100, and the positioning pin 190 passes through the splicing end at the bottom of the left gearbox 110 and the right gearbox 120. When the left gearbox 110 and the right gearbox 120 are spliced, the positioning pin 190 is first positioned by interlocking with the left gearbox 110 and the right gearbox 120, thereby improving the splicing accuracy. During operation, after being fixed, the positioning pin 190 can also play a certain limiting role at the bottom of the gearbox, reducing the transmission error between the left gearbox 110 and the right gearbox 120, thereby reducing gear wear.

[0032] like Figure 1 As shown, a vent cap assembly 3 and an oil plug assembly 4 are respectively provided on both sides of the gearbox 100. One end of the vent cap assembly 3 can be rotated open, and the other end is fixed to the splicing end of the left gearbox 110 and the right gearbox 120 on one side, and is connected to the oil inlet of the oil passage inside the gearbox 100. The vent cap assembly 3 is the oil inlet of the gearbox 100, and can vent through the vent hole on it to keep the internal pressure of the gearbox 100 stable. One end of the oil plug assembly 4 can also be rotated open, and the other end is fixed to the splicing end of the left gearbox 110 and the right gearbox 120 on the other side, and seals the end of the oil passage inside the gearbox 100 to prevent oil leakage.

[0033] Screws 130 are evenly distributed from top to bottom along the edge of the right housing 120, forming a pear-shaped structure that is narrower at the top and wider at the bottom. This arrangement fixes the right housing 120 to the left housing 110, and when the gearbox is working, each screw 130 is subjected to uniform force, which, together with the locating pin 190, makes the splicing more secure.

[0034] In this application, the structures and connections not described in detail are all prior art, and their structures and principles are well known, so they will not be described again here.

[0035] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A gearbox for an electric tricycle, comprising a housing (100), characterized in that, The box (100) is assembled from a left box (110) and a right box (120) by multiple screws (130); The housing (100) contains a differential assembly (2). The lower half of the left housing (110) contains a left drive shaft (111), and the lower half of the right housing (120) contains a right drive shaft (121). Both the left drive shaft (111) and the right drive shaft (121) are connected to the drive end of the differential assembly (2). The left drive shaft (111) is symmetrical to the right drive shaft (121), and its axial direction is on the same straight line as the axial direction of the right drive shaft (121). The left drive half-shaft (111) and the right drive half-shaft (121) are each provided with a bearing (140), a bearing end cover (150) and a first oil seal (161). The bearing end cover (150) is fixed to the bearing (140) and the first oil seal (161) is fixed to the bearing end cover (150). The upper half of the left housing (110) is recessed in the middle area to form a circular groove (112), and a shaft component (113) is provided in the center of the circular groove (112); one end of the shaft component (113) is used to connect to the motor, and the other end is used to connect to the drive end of the differential assembly (2).

2. The gearbox of the electric tricycle according to claim 1, characterized in that, The outer diameter of the bearing end cover (150) is larger than the outer diameter of the bearing (140). The outer diameter portion of the bearing end cover (150) is provided with a retaining ring (170). The two end faces of the retaining ring (170) are respectively attached to the bearing (140) and the first oil seal (161).

3. The gearbox of the electric tricycle according to claim 1, characterized in that, Dust covers (180) are also provided on the left drive half shaft (111) and the right drive half shaft (121); the dust cover (180) is installed on the inner circumference of the first oil seal (161), and its end face is annularly attached to the end face of the first oil seal (161).

4. The gearbox of the electric tricycle according to claim 1, characterized in that, The circular groove (112) is also provided with a second oil seal (162), which is press-fitted between the inner circumference of the circular groove (112) and the shaft component (113).

5. The gearbox of the electric tricycle according to claim 1, characterized in that, The bottom of the box (100) is provided with a positioning pin (190), which passes through the splicing end of the bottom of the left box (110) and the right box (120).

6. The gearbox of the electric tricycle according to claim 1, characterized in that, The box body (100) is provided with an air outlet cap assembly (3) and an oil plug assembly (4) on both sides respectively; One end of the vent cap assembly (3) can be rotated open, and the other end is fixed to the splicing end of the left box (110) and the right box (120) on one side, and is connected to the oil inlet end of the oil passage inside the box (100); One end of the oil plug assembly (4) can also be rotated open, and the other end is fixed to the splicing end on the other side of the left box (110) and the right box (120), and seals the end of the oil passage inside the box (100).

7. The gearbox of the electric tricycle according to claim 1, characterized in that, The screws (130) are evenly distributed from top to bottom along the edge of the right housing (120) and have a pear-shaped structure that is narrower at the top and wider at the bottom.

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