A miniature electric drive axle

Abstract

This utility model discloses a miniature electric drive axle. A first bearing seat is located on the lower side of the housing, and a first bearing seat is located on the lower side of the cover plate. The first bearing seat and a second bearing seat are correspondingly fitted. The housing and the cover plate are fitted together and connected by bolts. A drive gear shaft is mounted on the first and second bearing seats via bearings. The gear portion of the drive gear shaft is located inside the housing and the cover plate. A brake shaft is located on the left side of the drive gear shaft and passes through the housing. This utility model divides the drive axle into multiple relatively independent modules, facilitating maintenance and component replacement. Each module can be independently designed and optimized. This device places the brake device on the drive gear shaft, reducing the wheel-side structure and avoiding errors caused by stacking multiple components in the wheel-side area, thus facilitating assembly. The second oil seal prevents oil leakage and improves stability. By directly mounting the brake device on the drive gear shaft, one set of brake devices is reduced, lowering costs.

Description

Technical Field

[0001] This utility model relates to the field of drive axle technology, specifically a miniature electric drive axle. Background Technology

[0002] The widespread application of mini electric loaders in construction, landscaping, and other fields has placed higher demands on the load-bearing capacity and ease of maintenance of drive axles. While existing drive axle technology can achieve basic functions, it has shortcomings in structural design:

[0003] 1. Due to the high integration of components, the integrated drive axle requires complete disassembly during maintenance, which is time-consuming and labor-intensive, and is not conducive to subsequent iteration and optimization;

[0004] 2. Braking devices are usually installed on the wheel rim, which makes the connection structure of the wheel rim complex, such as multi-stage bearings and stacked gaskets, which is prone to assembly errors and sealing failures. In addition, the method of installing braking devices on the wheel hub requires the installation of braking devices on both sides of the wheel hub, which increases the cost.

[0005] These problems not only increase the cost of assembly and subsequent maintenance, but also limit the reliability of the drive axle under high load conditions. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a miniature electric drive axle to address the shortcomings of the prior art, thereby solving at least one of the above-mentioned technical problems.

[0007] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A miniature electric drive axle includes a housing, a cover plate, and a half-shaft flange. A first bearing seat is provided on the lower side of the housing, and a second bearing seat is provided on the lower side of the cover plate. The first bearing seat and a second bearing seat are correspondingly fitted. The housing and the cover plate are fitted together and connected by bolts. A drive gear shaft is provided on the first bearing seat and the second bearing seat through a bearing fit. The gear part of the drive gear shaft is located inside the housing and the cover plate. A brake shaft is provided on the left side of the drive gear shaft and passes through the housing. A connecting structure is provided on the right side of the drive gear shaft. A driven gear is fitted in the middle of the housing and the cover plate. The driven gear and the drive gear... The drive gear is connected to a shaft drive. A cross shaft seat is bolted to the middle of the driven gear. A cross shaft is fixedly mounted on the cross shaft seat. A planetary bevel gear is mounted on the cross shaft. Shaft holes are provided on the sides of the housing and the cover plate. Bevel gear seats are provided on the sides of the housing and the cover plate through bearings. Half-shaft bevel gears are fixedly connected to the bevel gear seats. The half-shaft bevel gears on both sides are connected to the planetary bevel gears. A bridge housing is threaded to the outer sides of the housing and the cover plate, and the connection points correspond to the shaft holes. The half-shaft flange passes through the bridge housing and is connected to the bevel gear seat. The half-shaft flange is connected to the end of the bridge housing through bearings. A connecting screw is provided on the flange of the half-shaft flange.

[0008] A brake is fixedly mounted on the left side of the second shaft seat by bolts. A brake drum seat is fixedly mounted on the brake shaft by bolts. A brake drum is connected to the brake drum seat by bolts. The brake and the brake drum are correspondingly matched.

[0009] Furthermore, the connection structure is a slot structure.

[0010] Furthermore, the half-shaft flange is detachably connected to the bevel gear seat.

[0011] Furthermore, a bearing groove is provided at the end of the bridge housing, a bearing is provided in the bearing groove, and a bearing cover is bolted to the end of the bridge housing, the bearing cover and the bearing groove are fitted together to fix the bearing.

[0012] Furthermore, a first oil seal is provided between the second bearing and the brake shaft.

[0013] Furthermore, the first oil seal is a double-lip oil seal.

[0014] Furthermore, a second oil seal is provided between the half-shaft flange and the bearing cover.

[0015] Furthermore, the second oil seal is a double-lip oil seal.

[0016] The beneficial effects of this utility model are:

[0017] This invention divides the drive axle into multiple relatively independent modules, facilitating maintenance and component replacement. Each module can be independently designed and optimized. The device places the brake device on the drive gear shaft, reducing the wheel edge structure and avoiding errors caused by stacking multiple parts on the wheel edge, thus facilitating assembly. The second oil seal prevents oil leakage and improves stability. By placing the brake device directly on the drive gear shaft, one set of brake devices is reduced, thus lowering costs. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

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

[0020] The attached diagram lists the components represented by each number as follows:

[0021] 1. Housing; 2. Cover plate; 3. First shaft seat; 4. Second shaft seat; 5. Drive gear shaft; 6. Connecting structure; 7. Brake shaft; 8. Driven gear; 9. Cross shaft seat; 10. Cross shaft; 11. Planetary bevel gear; 12. Bevel gear seat; 13. Half shaft bevel gear; 14. Bridge housing; 15. Half shaft flange; 16. Bearing groove; 17. Bearing cover; 18. Connecting screw; 19. Brake drum seat; 20. Brake drum; 21. First oil seal; 22. Second oil seal. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0027] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] Example 1: See Figure 1This is a schematic diagram of the structure of this utility model, including a housing 1, a cover plate 2, and a half-shaft flange 15. A first bearing seat 3 is provided on the lower side of the housing 1, and a first bearing seat 3 is provided on the lower side of the cover plate 2. The first bearing seat 3 and a second bearing seat 4 are correspondingly fitted. The housing 1 and the cover plate 2 are fitted together and connected by bolts. After the housing 1 and the cover plate 2 are fitted together, a cavity is provided on the inner side to accommodate the driven gear 8 and the driving gear shaft 5. The first bearing seat 3 and the second bearing seat 4 are fitted together by bearings to accommodate the driving gear shaft 5. The gear part of the driving gear shaft 5 is located in the housing 1. Inside the cover plate 2, a brake shaft 7 is located on the left side of the drive gear shaft 5, and the brake shaft 7 passes through the housing 1. The brake shaft 7 is used for the braking device. A connecting structure 6 is located on the right side of the drive gear shaft 5, which is used for transmission connection with the output end of the power motor. A driven gear 8 is fitted in the middle of the housing 1 and the cover plate 2. The driven gear 8 is transmission connected to the drive gear shaft 5. The drive gear shaft 5 rotates under the drive of the motor, and the rotation of the drive gear shaft 5 drives the driven gear 8 to rotate. The middle of the driven gear 8 is connected by bolts. A cross shaft seat 9 is connected, and a cross shaft 10 is fixedly mounted on the cross shaft seat 9. Four planetary bevel gears 11 are mounted on the cross shaft 10 in a ring arrangement. Shaft holes are provided on the sides of both the housing 1 and the cover plate 2. Bevel gear seats 12 are mounted on the sides of both the housing 1 and the cover plate 2 via bearings. Half-shaft bevel gears 13 are fixedly connected to the bevel gear seats 12. The bevel gear seats 12 have grooves for housing bearings. After installation, the bridge housing 14 limits the movement of the gears mounted on the bevel gear seats 12. The half-shafts on both sides... All bevel gears 13 are connected to the planetary bevel gears 11 for transmission. The half-shaft bevel gears 13 on both sides cooperate with the extrusion and limit planetary bevel gears 11. The outer sides of the housing 1 and the cover plate 2 are connected to the bridge housing 14 by threads, and the connection part corresponds to the shaft hole. The half-shaft flange 15 passes through the bridge housing 14 and is connected to the bevel gear seat 12. The connection method can be interference fit. The half-shaft flange 15 is connected to the end of the bridge housing 14 through the bearing. The flange part of the half-shaft flange 15 is provided with a connecting screw 18, which is the same as the fixed hub.

[0029] A brake is fixed to the left side of the second axle seat 4 by bolts. A brake drum seat 19 is fixed to the brake shaft 7 by bolts. A brake drum 20 is connected to the brake drum seat 19 by bolts. The brake and the brake drum 20 are correspondingly matched. The brake uses a brake transmission mechanism to make the brake shoes press the brake friction pads against the inside of the brake drum 20, thereby generating braking force. By using the method of brake recovery braking with the motor kinetic energy and setting a brake device on the brake shaft 7, the braking effect can achieve the same effect as setting a brake device on both sides of the wheel edge.

[0030] Specifically, connection structure 6 is a slot structure, which facilitates connection with the output end of the power motor for transmission.

[0031] Specifically, the half-shaft flange 15 is detachably connected to the bevel gear seat 12, which facilitates the disassembly of the half-shaft flange 15.

[0032] Specifically, the end of the bridge housing 14 is provided with a bearing groove 16, and a bearing is provided in the bearing groove 16. The end of the bridge housing 14 is connected to a bearing cover 17 by bolts. The bearing cover 17 cooperates with the bearing groove 16 to fix the bearing, which facilitates the fixing of the bearing.

[0033] Specifically, a first oil seal 21 is provided between the second bearing seat 4 and the brake shaft 7 to prevent oil leakage.

[0034] Specifically, the first oil seal 21 is a double-lip oil seal.

[0035] Specifically, a second oil seal 22 is provided between the half-shaft flange 15 and the bearing cover 17 to prevent oil leakage.

[0036] Specifically, the second oil seal 22 is a double-lip oil seal.

[0037] When replacing the axle housing 14 and support shaft with new materials, the operator removes the half-shaft flange 15, separating the end of the half-shaft flange 15 from the bevel gear seat 12. The operator removes the bolts connecting the housing 1 and the cover plate 2, removes the axle housing 14, removes the bearing cover 17 on the axle housing 14 and removes the bearing, installs the new material axle housing 14 onto the axle housing 14 and the cover plate 2, installs the bearing into the bearing groove 16, and uses bolts to install the bearing cover 17 plate 2 onto the axle housing 14 to fix the bearing. The half-shaft flange 15 is then passed through the axle housing 14 and connected to the bevel gear seat 12, completing the replacement of the axle housing 14.

[0038] During braking, the brake and brake drum 20 are matched and the brake uses the brake transmission mechanism to press the brake shoes against the brake friction pads inside the brake drum 20, thereby generating braking force. By using the motor kinetic energy recovery braking and the brake device set on the brake shaft 7, the braking effect can be achieved as if the brake device is set on both sides of the wheel edge.

[0039] This utility model divides the drive axle into multiple relatively independent modules, which facilitates maintenance and component replacement. Each module can be designed and optimized independently. The device sets the brake device on the drive gear shaft 5, which reduces the wheel side structure, avoids the error of multiple parts stacking on the wheel side, and facilitates assembly. The setting of the second oil seal 22 prevents oil leakage and improves stability. The brake device is directly set on the drive gear shaft 5, which reduces one set of brake devices and lowers the cost.

[0040] The above are merely optional embodiments of this utility model and are not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0041] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

Claims

1. A miniature electric drive axle, characterized in that: The assembly includes a housing (1), a cover plate (2), and a half-shaft flange (15). A first bearing seat (3) is provided on the lower side of the housing (1), and a second bearing seat (4) is provided on the lower side of the cover plate (2). The housing (1) and the cover plate (2) are fitted together and connected by bolts. A drive gear shaft (5) is provided on the first bearing seat (3) and the second bearing seat (4) through a bearing fit. The gear part of the drive gear shaft (5) is located inside the housing (1) and the cover plate (2). A brake shaft (7) is provided on the left side of the drive gear shaft (5) and passes through the housing (1). A connecting structure (6) is provided on the right side of the drive gear shaft (5). A driven gear (8) is fitted in the middle of the housing (1) and the cover plate (2). The driven gear (8) is connected to the drive gear shaft (5) in a transmission manner. The part is connected to a cross shaft seat (9) by bolts. The cross shaft seat (9) is fixedly mounted with a cross shaft (10). A planetary bevel gear (11) is mounted on the cross shaft (10). The sides of the housing (1) and the cover plate (2) are provided with shaft holes. The sides of the housing (1) and the cover plate (2) are provided with bevel gear seats (12) through bearings. The bevel gear seats (12) are fixedly connected with half-shaft bevel gears (13). The half-shaft bevel gears (13) on both sides are connected to the planetary bevel gears (11) for transmission. The outer sides of the housing (1) and the cover plate (2) are connected to bridge housings (14) by threads, and the connection points correspond to the shaft holes. The half-shaft flange (15) passes through the bridge housing (14) and is connected to the bevel gear seat (12). The half-shaft flange (15) is connected to the end of the bridge housing (14) through bearings. The flange part of the half-shaft flange (15) is provided with connecting screws (18). A brake is fixedly mounted on the left side of the second shaft seat (4) by bolts. A brake drum seat (19) is fixedly mounted on the brake shaft (7) by bolts. A brake drum (20) is connected to the brake drum seat (19) by bolts. The brake and the brake drum (20) are correspondingly matched.

2. The miniature electric drive axle according to claim 1, characterized in that: The connection structure (6) is a slot structure.

3. The miniature electric drive axle according to claim 1, characterized in that: The half-shaft flange (15) is detachably connected to the bevel gear seat (12).

4. The miniature electric drive axle according to claim 1, characterized in that: The end of the bridge housing (14) is provided with a bearing groove (16), and a bearing is provided in the bearing groove (16). The end of the bridge housing (14) is connected to a bearing cover (17) by bolts, and the bearing cover (17) cooperates with the bearing groove (16) to fix the bearing.

5. The miniature electric drive axle according to claim 1, characterized in that: A first oil seal (21) is provided between the second bearing seat (4) and the brake shaft (7).

6. The miniature electric drive axle according to claim 5, characterized in that: The first oil seal (21) is a double-lip oil seal.

7. The miniature electric drive axle according to claim 1, characterized in that: A second oil seal (22) is provided between the half-shaft flange (15) and the bearing cover (17).

8. The miniature electric drive axle according to claim 7, characterized in that: The second oil seal (22) is a double-lip oil seal.

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