Double-lubrication-cavity motor for two-wheeled vehicle

Abstract

The utility model relates to a double lubrication cavity motor for a two-wheeled vehicle, which comprises a stator shaft, a rotor end cover and a rotor brake cover, the rotor end cover and the rotor brake cover are arranged on the stator shaft in a penetrating manner to form a motor shell, sealing lubrication cavities are respectively formed at the rotor end cover and the rotor brake cover, bearings are arranged in the sealing lubrication cavities, and a lubrication passage which penetrates through the sealing lubrication cavities and is communicated with the interior of the motor shell is formed. The double-lubricating-cavity motor can continuously supply lubricating grease to the framework oil seal and the deep groove ball bearing for a long time, ensures long-time normal operation of a sealing piece and an operating piece of the motor, and solves the problem that the sealing of the motor fails or the operation of a bearing piece fails after the lubricating grease in the oil seal and the bearing is consumed up. Therefore, the motor protection sealing level and the durability of the rotating part and the bearing part are improved, and the service life of the motor is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of two-wheeled vehicle motors, in particular to a double-lubricating cavity motor for a two-wheeled vehicle. Background Art

[0002] The service life of the drive hub motors of electric two-wheeled vehicles on the market has been criticized and has become a focus of attention for users and the industry. How to improve the service life of electric two-wheeled vehicle motors or how to extend the three-guarantee after-sales period has become an unavoidable issue.

[0003] Taking the hub motors used in electric two-wheeled vehicles in the industry as an example, the total number of motor returns due to quality issues is expected to exceed 100,000 units throughout the year. Among them, the total number of motor returns due to aging of motor components, end of part life, and failure of seals within the after-sales period accounts for more than 30%. How to improve the service life of the motor and how to increase the effective working time of motor components have become pain points that the industry urgently needs to solve.

[0004] The main factors that affect the service life of the motor and the effective working time of the motor components are the skeleton oil seal and the bearing. Although there is grease in the oil storage tanks inside the two components, it will eventually be exhausted after years of friction loss. Without grease, the motor will run dry friction, causing the motor seal to fail, and ultimately leading to the end of the motor life. Utility Model Content

[0005] In response to the shortcomings of the above-mentioned existing production technology, the applicant provides a rationally structured dual-lubrication chamber motor for two-wheeled vehicles, which adds independent sealed chambers on both sides of the motor to provide a stable and continuous lubrication structure and reduce the risk of dry friction caused by rapid depletion of grease.

[0006] The technical solutions adopted in this utility model are as follows:

[0007] A dual-lubrication chamber motor for a two-wheeled vehicle includes a stator shaft, a rotor end cover and a rotor brake cover that are inserted through the stator shaft to form a motor housing. The rotor end cover and the rotor brake cover are each formed with a sealed lubrication chamber, and a bearing is built into the sealed lubrication chamber to form a lubrication passage that passes through the sealed lubrication chamber and connects to the interior of the motor housing.

[0008] As a further improvement of the above technical solution:

[0009] Sealing assemblies are installed between the rotor end cover and the stator shaft, and between the rotor brake cover and the stator shaft. The sealing assemblies include an outer oil seal and an inner oil seal. A sealed lubrication cavity is formed between the outer oil seal and the inner oil seal. Washers are provided at both ends of the bearing axis in the sealed lubrication cavity.

[0010] The washer is installed between the bearing and the inner oil seal.

[0011] Steps are set at the installation holes of the rotor end cover and the rotor brake cover, and the bearing contacts the step surface. The lubrication path starts from the motor housing and passes through the inner oil seal, gasket, bearing, step surface and outer oil seal in sequence.

[0012] The sealing structures at the rotor end cover and the rotor brake cover are arranged symmetrically.

[0013] The sealing lubrication cavity is filled with grease, and the grease is consumed at a uniform rate at the lips at both axial ends of the sealing component.

[0014] The two inner oil seals of the sealing components on both sides of the motor housing have their lips inclined in the same direction as the installation direction.

[0015] The inclined trend surface of the lip is an inward trend surface pointing to the inside of the motor.

[0016] The bearings are open deep groove ball bearings.

[0017] The beneficial effects of the utility model are as follows:

[0018] The utility model provides a motor with double lubrication chambers, which can solve the problem of motor seal failure or bearing operation failure after the hub motor has worked for a long time and the grease in the oil seal and the bearing is consumed.

[0019] The utility model is different from the structure of ordinary hub motor side cover, which has a seal and a bearing on each side. A lubrication cavity is provided between the stator shaft and the end cover and the brake cover, that is, there are two sealing structures on each side of the motor side cover, and a closed cavity is formed between the two sealing structures. The bearing is located in this cavity, and the cavity is filled with sufficient grease, thereby forming a closed double lubrication chamber, which can continuously supply grease to the skeleton oil seal and deep groove ball bearing for a long time, ensuring the long-term normal operation of the motor's seals and moving parts, thereby improving the motor's protective sealing level and the durability of the rotating parts and bearings, thereby increasing the motor's service life.

[0020] The end cover oil seal and brake cover oil seal lip of the utility model are set to a trend structure in the same direction as the installation direction. When the two oil seals go through the shaft threading process, the existence of the inward trend surface can avoid flanging, improve the indirectness of the process installation, and ensure the airtightness of the double lubrication chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a cross-sectional view of the overall structure of the motor of the present utility model.

[0022] Figure 2 for Figure 1 The enlarged view of section A shows the sealing structure at the rotor end cover. The red lines in the figure illustrate the lubrication path.

[0023] Figure 3 for Figure 1 The enlarged view of part B shows the sealing structure of the rotor brake cover. The red lines in the figure are used to illustrate the lubrication path.

[0024] Figure 4 This is a schematic diagram of the lip of one of the inner oil seals, used to illustrate the lip trend.

[0025] Including: 1. Rotor end cover; 2. Rotor brake cover; 3. Stator shaft; 4. Sealing assembly;

[0026] 401. End cover inner oil seal; 402. End cover outer oil seal; 403. End cover lubrication seal chamber; 404. End cover bearing; 405. Gasket; 406. Brake cover outer oil seal; 407. Brake cover inner oil seal; 408. Brake cover sealed lubrication chamber; 409. Brake cover bearing. DETAILED DESCRIPTION

[0027] The specific implementation of the present utility model will be described below with reference to the accompanying drawings.

[0028] like Figures 1-4 As shown, the dual-lubrication chamber motor for two-wheeled vehicles of this embodiment includes a stator shaft 3, a rotor end cover 1 and a rotor brake cover 2 which are passed through the stator shaft 3 to form a motor housing. The rotor end cover 1 and the rotor brake cover 2 are each formed with a sealed lubrication chamber, and a bearing is built into the sealed lubrication chamber to form a lubrication passage that passes through the sealed lubrication chamber and connects to the interior of the motor housing.

[0029] A sealing assembly 4 is installed between the rotor end cover 1 and the stator shaft 3, and between the rotor brake cover 2 and the stator shaft 3. The sealing assembly 4 includes an outer oil seal and an inner oil seal. A sealed lubrication cavity is formed between the outer oil seal and the inner oil seal. Washers 405 are provided at both axial ends of the bearing in the sealed lubrication cavity.

[0030] The washer 405 is installed between the bearing and the inner oil seal.

[0031] Steps are provided at the mounting holes of the rotor end cover 1 and the rotor brake cover 2. The bearing contacts the step surface. The lubrication passage starts from the motor housing and passes through the inner oil seal, the washer 405, the bearing, the step surface and the outer oil seal in sequence.

[0032] The sealing structures at the rotor end cover 1 and the rotor brake cover 2 are symmetrically arranged.

[0033] The sealing lubrication cavity is filled with grease, and the grease is consumed at a uniform rate at the lips at both ends of the sealing component 4 in the axial direction.

[0034] The two inner oil seals of the sealing assembly 4 on both sides of the motor housing have their lips inclined in the same direction as the installation direction.

[0035] The inclined trend surface of the lip is an inward trend surface pointing to the inside of the motor.

[0036] The bearings are open deep groove ball bearings.

[0037] The specific structure and working principle of the utility model are as follows:

[0038] The technical points of this utility model are as follows: Figure 1 As shown, a sealed lubrication cavity is provided at each of the positions where the rotor end cover 1 and the rotor brake cover 2 cooperate with the stator shaft 3, together forming a dual lubrication cavity structure of the motor.

[0039] The rotor end cover 1 and the rotor brake cover 2 form the two side walls of the hub motor. The stator shaft 3 passes through the rotor end cover 1 and the rotor brake cover 2. A group of sealing components 4 for forming a sealed lubrication cavity are provided between the rotor end cover 1 and the stator shaft 3 and between the rotor brake cover 2 and the stator shaft 3.

[0040] like Figure 2 As shown, an inner end cover oil seal 401 is installed on the side of the rotor end cover 1 facing the interior of the motor, and an outer end cover oil seal 402 is installed on the side of the rotor end cover 1 facing the exterior of the motor. The space formed between the inner end cover oil seal 401 and the outer end cover oil seal 402 constitutes the end cover lubrication seal cavity 403, within which an end cover bearing 404 is placed. Washers 405 are installed on both axial sides of the end cover bearing 404. The function of the washers 405 is to prevent interference between the inner end cover oil seal 401 and the end cover bearing 404, and to further increase the contact area between the lubrication seal cavity and the lubricating oil or grease.

[0041] Grease is injected into the end cover lubrication seal cavity 403. Because the end cover bearing 404 is designed as a deep groove ball bearing without a sealant cap, the grease can move within the lubrication seal cavity as the motor rotates, forming a path between the oil seals at both ends. When the motor is running, the grease not only keeps the end cover bearing 404 continuously lubricated, but also continuously lubricates the end cover outer oil seal 402 and the end cover inner oil seal 401. Even if the motor operates for a long time under different operating conditions, the grease will lubricate the gap between the stator shaft 3 and the oil seal lip, reducing grease consumption and effectively extending the motor's service life.

[0042] Combined with reference Figure 4 , wherein the lip of the outer oil seal 402 of the end cover extends outward to fit the surface of the stator shaft 3, the lip end face of the inner oil seal 401 of the end cover is perpendicular to the stator shaft 3, and the inner wall of the lip is inclined toward the end face of the inner oil seal 401 of the end cover.

[0043] like Figure 3As shown, at the rotor brake cover 2, a brake cover outer oil seal 406 and a brake cover inner oil seal 407 are sleeved on the stator shaft 3. The brake cover outer oil seal 406 is located inside the motor, and the brake cover outer oil seal 406 is located outside the motor. A brake cover sealed lubrication cavity 408 is formed between the brake cover inner oil seal 407 and the brake cover outer oil seal 406, and a brake cover bearing 409 is arranged in the brake cover sealed lubrication cavity 408.

[0044] Washers 405 are also placed on either side of the brake cover bearing 409 to increase the lubrication area and extend the grease flow path, ensuring a more even and slow consumption of the grease injected into the brake cover's sealed lubrication cavity 408. Brake cover bearing 409 is also a deep groove ball bearing without a sealant cap. As the motor rotates, the grease moves back and forth within the lubrication seal cavity, forming a path between the brake cover's oil seals at both ends.

[0045] When the motor is running, the grease keeps the brake cover bearing 409 in continuous lubrication operation, and on the other hand, it can continuously provide lubrication to the brake cover outer oil seal 406 and the brake cover inner oil seal 407 at both ends. Even if the motor is operated under different working conditions for many years, causing the grease to be slowly consumed through the lips of the oil seals on both sides, the motor can still maintain a long service life, thereby improving the service life of the motor.

[0046] Combined with reference Figure 4 The lip end face of the oil seal 407 inside the brake cover is perpendicular to the stator shaft 3, and the inner wall of the lip is inclined toward the end face of the oil seal 407 inside the brake cover. The lip of the oil seal 406 outside the brake cover extends outward to fit the surface of the stator shaft 3, that is, the oil seal 401 inside the end cover and the oil seal 407 inside the brake cover, the lip is set to a trend structure in the same direction as the installation. When the two oil seals go through the process of passing through the shaft, the existence of the inward trend surface avoids flanging, improves the simplicity of the process installation, and ensures the airtightness of the double lubrication chamber.

[0047] The double-sealed lubrication chamber structure of the utility model, on the one hand, slows down the consumption rate of grease, and on the other hand, places the open bearing in the lubrication chamber, providing sufficient lubrication to the open bearing without affecting the flow of grease in the lubrication chamber, forming a reliable lubrication passage, and providing continuous and effective lubrication for the bearing and oil seal.

[0048] The above description is an explanation of the utility model, not a limitation of the utility model. The scope of the utility model is defined by the claims. Any form of modification can be made within the scope of protection of the utility model.

Claims

1. A two-wheeled vehicle double lubrication chamber motor, comprising a stator shaft (3), a rotor end cover (1) and a rotor brake cover (2) which are provided on the stator shaft (3) to form a motor housing, characterized in that: A sealed lubrication cavity is formed at each of the rotor end cover (1) and the rotor brake cover (2), and a bearing is built into the sealed lubrication cavity to form a lubrication passage that penetrates the sealed lubrication cavity and communicates with the interior of the motor housing.

2. The dual-lubricating chamber motor for a two-wheeled vehicle according to claim 1, characterized in that: A sealing assembly (4) is installed between the rotor end cover (1) and the stator shaft (3), and between the rotor brake cover (2) and the stator shaft (3). The sealing assembly (4) includes an outer oil seal and an inner oil seal. A sealed lubrication cavity is formed between the outer oil seal and the inner oil seal. Washers (405) are provided at both ends of the bearing axial direction in the sealed lubrication cavity.

3. The dual-lubricating chamber motor for a two-wheeled vehicle according to claim 2, characterized in that: The washer (405) is installed between the bearing and the inner oil seal in a conflicting manner.

4. The dual-lubricating chamber motor for a two-wheeled vehicle according to claim 3, characterized in that: Steps are provided at the mounting holes of the rotor end cover (1) and the rotor brake cover (2), and the bearing contacts the step surface. The lubrication passage starts from the motor housing and passes through the inner oil seal, the washer (405), the bearing, the step surface, and the outer oil seal in sequence.

5. The dual-lubricating chamber motor for a two-wheeled vehicle according to claim 1, characterized in that: The sealing structures at the rotor end cover (1) and the rotor brake cover (2) are symmetrically arranged.

6. The dual-lubricating chamber motor for a two-wheeled vehicle according to claim 2, characterized in that: The sealing lubrication cavity is filled with lubricating grease, and the lubricating grease is consumed at a uniform speed at the lips at both axial ends of the sealing component (4).

7. The dual-lubricating chamber motor for a two-wheeled vehicle according to claim 6, characterized in that: The two inner oil seals of the sealing components (4) on both sides of the motor housing have the inclined trend surfaces of the lips set to be in the same oblique direction as the installation direction.

8. The dual-lubricating chamber motor for a two-wheeled vehicle according to claim 7, characterized in that: The inclined trend surface of the lip is an inward trend surface pointing to the inside of the motor.

9. The dual-lubricating chamber motor for a two-wheeled vehicle according to claim 1, characterized in that: The bearings are open deep groove ball bearings.

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