Electric wheel arrangement for mine cars

Abstract

The application belongs to the technical field of driving systems and provides an electric wheel for a mine car, which comprises a wheel hub motor (1), a planetary reducer (2), a brake (3), a wheel (4) and a steering column (5); the planetary reducer (2) comprises a reducer shell (2-1), a wheel hub bearing (2-2), a wheel hub (2-3), a flange (2-6), a gear outer ring (2-8), a first-stage sun gear (2-9), a last-stage planet carrier (2-10) and an output connecting disc (2-11); the reducer shell (2-1) is supported on the wheel hub (2-3) through the wheel hub bearing (2-2); and the reducer shell (2-1) is internally provided with a multi-stage planetary row. The application has the advantages of small volume, complete arrangement in a wheel space, no occupation of a suspension space, support for double wishbone, MacPherson and other independent suspensions, support for a connected axle housing type non-independent suspension, optimization of bearing positions and reducer shells, guarantee of reliability and service life of the electric wheel under heavy loads and mine harsh conditions.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of driving system, and particularly relates to an electric wheel device for a mine car. BACKGROUND

[0002] The mine car is a non-highway vehicle used for transporting mineral and sandstone materials in large mines and large engineering construction. The main features are heavy load, low speed, long-time operation and high energy consumption. The electric driving system can well adapt to the low-speed heavy-load working condition and is commonly used in mine cars with a capacity of more than 100 tons. The driving execution unit of the electric driving system is an electric wheel. The electric wheel is a component integrating a motor, a reducer and a brake in a wheel. Currently, there are two main structures of the electric wheel as follows.

[0003] The first structure: a wind-cooled motor is adopted, the motor is arranged in the middle, the reducer is arranged on the inner side of the vehicle, and the brake is arranged on the outer side of the vehicle, and the brake is a high-speed end brake. The motor is a wind-cooled induction motor, and an air inlet is left on the end cover of the reducer. A blower sends cooling air to the air inlet on the end cover of the reducer of the electric wheel to the driving motor for cooling. The reducer adopts a one-stage internal meshing and one external meshing NW planetary gear reduction mechanism. The advantages of this scheme are short axial size, and the disadvantages are that the air needs to cool the motor after the reducer, the air needs to be processed, and the air is sent to the motor through the air duct to ensure the cleanliness of the air and avoid pollution of the gear box. The air duct occupies a large space, which is not conducive to the overall design of the electric mine car and is not conducive to the expansion into a four-wheel drive vehicle.

[0004] The second structure: a wind-cooled motor is adopted, the axial size is long, the motor is arranged outside the wheel, the reducer is arranged on the outermost side, and the brake is arranged in the middle as a low-speed end brake. The advantages of this scheme are that the motor is exposed and can be naturally air-cooled or arranged in the axle housing for forced air cooling. However, this structure has a long axial size, and the motor occupies the arrangement space of the suspension, which is not easy to match the independent suspension. SUMMARY

[0005] (I) Technical problem to be solved

[0006] The purpose of the present application is to provide an electric wheel for a mine car to solve the problems of the existing electric wheel structure, such as large size, not easy to match the independent suspension, and unable to adapt to the heavy load of the mine truck and the harsh working conditions of the mine.

[0007] (II) Technical scheme

[0008] The present application provides an electric wheel for a mine car, which comprises a wheel hub motor 1, a planetary reducer 2, a brake 3, a wheel 4 and a steering column 5.

[0009] The planetary reducer 2 comprises a reducer housing 2-1, a hub bearing 2-2, a hub 2-3, a flange 2-6, a gear outer ring 2-8, a first-stage sun gear 2-9, a last-stage carrier 2-10, and an output connecting disc 2-11;

[0010] The reducer housing 2-1 is supported in the hub 2-3 through the hub bearing 2-2, and is internally provided with multiple-stage planetary rows; the hub bearing outer ring is connected with the hub 2-3, and the hub 2-3 inner ring is connected with the reducer housing; the first-stage sun gear 2-9 of the planetary reducer 2 is connected with the output shaft of the wheel hub motor 1, the last-stage carrier 2-10 of the planetary reducer 2 is connected with the output connecting disc 2-11, and the output connecting disc 2-11 is fixedly connected with the hub 2-3;

[0011] The gear outer ring 2-8 is fixedly connected with the reducer housing 2-1, and serves as a gear ring of each planetary row;

[0012] The flange 2-6 is fixed at the right end of the reducer housing 2-1, and is fixedly connected with the wheel hub motor 1; the steering column 5 is connected with the flange 2-6, and the wheel hub motor 1 is arranged between the steering column 5 and the reducer housing 2-1;

[0013] The brake 3 comprises a service brake 3-1, a parking brake 3-2, and a brake disc 3-3; the brake disc 3-3 is connected with the output shaft of the wheel hub motor, and the service brake 3-1 and the parking brake 3-2 are fixed on the steering column 5; the steering column 5 is fixedly connected with the suspension.

[0014] Preferably, the wheel hub motor 1 is driven by high-voltage direct current, and adopts double three-phase current input.

[0015] Further, the inner wall of the reducer housing 2-1 is provided with a backflow oil channel 2-13.

[0016] Further, the reducer housing 2-1 is internally provided with three-stage planetary rows.

[0017] Further, the steering column 5 is provided with a boss.

[0018] Further, the middle part of the hub bearing 2-2 is provided with a protruding structure.

[0019] Further, the electric wheel is fixed on the suspension through the steering column 5.

[0020] Further, the service brake 3-1 and the parking brake 3-2 are both arranged at the high-speed end.

[0021] Further, the brake is arranged on the inner side of the vehicle, and the planetary reducer is arranged on the outer side of the vehicle.

[0022] (Three) beneficial effects

[0023] The electric wheel for mine provided by the application has small volume, is completely arranged in the wheel space, does not occupy the suspension space, can support double wishbone, MacPherson and other independent suspensions, and can also support the non-independent suspension of the connected bridge shell. Meanwhile, through optimization of the bearing position and the reducer shell, the reliability and service life of the electric wheel under heavy load and mine harsh conditions are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 The structural topology of the application is shown.

[0025] Figure 2 The structural diagram of the electric wheel device is shown.

[0026] Figure 3 The oil passage diagram of the reducer shell is shown.

[0027] Figure 4 The installation structural diagram of the steering column is shown.

[0028] Figure 5 The wheel brake and cable installation structural diagram of the electric drive wheel is shown.

[0029] Figure 6 The schematic diagram of one form connected with the suspension is shown. DETAILED DESCRIPTION

[0030] In order to make the purpose, content and advantages of the application more clear, the specific embodiments of the application are described in detail below in combination with the drawings and examples.

[0031] As shown in Figures 1-6 The electric wheel device for mine provided by the embodiment includes the main components motor 1, reducer 2 which can be adjusted according to the speed ratio, and brake 3 from the inside of the vehicle to the outside of the vehicle. The current enters the motor 1, transmits the torque to the reducer through the output shaft, the reducer reduces the speed and increases the torque, then transmits the torque to the wheel 4 to realize the driving. The steering column 5 is fixed on the suspension. The brake disc is connected to the other side output shaft of the motor, the brake is fixed on the reducer shell, the pressure is on the rotating brake disc through the hydraulic actuator piston, the brake force is transmitted to the wheel through the motor shaft and the reducer to increase the torque, and the brake is realized.

[0032] The hub motor 1 includes motor output shaft 1-1, cable connection box one 1-2, cable connection box two 1-3, motor shell 1-4, motor stator 1-5;

[0033] The planetary reducer 2 includes a reducer housing 2-1, a hub bearing 2-2, a hub 2-3, a bearing locking sleeve 2-4, a gasket 2-5, a flange 2-6, a long bolt 2-7, a gear outer ring 2-8, a first-stage sun gear 2-9, a last-stage planet carrier 2-10, an output connecting disc 2-11, and a flange bolt 2-12. The reducer housing 2-1 is a fixed bearing. A pair of hub taper bearings 2-2 are fixed on the reducer housing, and the outer rings and the hub 2-3 are connected. The whole vehicle spring load is transmitted to the reducer housing 2-1 to the taper bearing 2-2 through the steering column 5, to the hub 2-3 through the tire, and finally to the ground. The bearing locking sleeve 2-4 is pressed on the bearing inner ring through the gasket 2-5. A through hole is formed in the bearing locking sleeve 2-4, and a threaded hole is formed in the reducer housing 2-1, and a circle of bolts is used to provide the bearing pre-tightening force. In the present application, the hub taper bearing arrangement scheme adopts a scheme symmetrical to the hub, which has higher support stiffness and can more effectively bear the whole vehicle load.

[0034] The reducer housing 2-1 acts as a bearing, not only bearing the transmission of the whole vehicle weight, but also providing support and positioning for the motor 1 and the reducer 2. The motor 1 is embedded between the steering column 5 and the reducer housing 2-1 through the flange 2-6, and is fixed to the reducer housing 2-1 through the long bolt 2-7. At the same time, the flange bolt 2-12 connects the flange 2-6 and the motor housing 1-2 together. During maintenance, the removal of the long bolt 2-7 can directly remove the steering column 5 without affecting the installation state of the motor 1. After removing the flange bolt 2-12, the motor can be pulled out and installed, which can effectively improve the maintenance.

[0035] The reducer gear outer ring 2-8 is a fixed part, which is fixed on the reducer housing 2-1 through splines to provide three planetary gear sets for the whole reducer.

[0036] To ensure that the bearings on the first planetary row can be fully lubricated, a backflow oil channel 2-13 is designed in the reducer housing 2-1. The lubricating oil agitated by the planetary row to the inner wall of the reducer housing 2-1 is directly backflowed to the bearing, improving the use efficiency of the lubricating oil and the lubrication condition of the bearing.

[0037] Since the hub taper bearing 2-2 shares the lubricating oil with the gear bearing inside the reducer 2, in order to reduce the amount of lubricating oil, the hub 2-3 is designed with a boss on the inside to reduce the space for storing oil in the hub bearing 2-2. A ribbed structure is used on the outside to reduce the overall weight.

[0038] The motor output shaft 1-1 is connected through gear and spline to transmit torque to the first stage sun gear 2-9 of the reducer. The torque is reduced through multiple stages of planetary reducer and output by the last stage carrier 2-10. The spline is arranged on the last stage carrier 2-10 and connected with the output connecting disc 2-11. The output connecting disc 2-11 and the wheel hub 2-3 are fixed by bolts to complete the output of driving torque.

[0039] The present application is arranged with a service brake 3-1 and a parking brake 3-2 and a brake disc 3-3 for parking brake and service brake. The brake disc is connected with the motor shaft 1-1 through spline. The motor 1 rotates to drive the brake disc 3-3 to rotate. The service brake 3-1 and the parking brake 3-2 are fixed on the steering column 5 by bolts. The brake function is realized by clamping and releasing the brake disc through the hydraulic actuator. In order to ensure that the braking force generated by the service brake 3-1 does not generate excessive bending moment on the motor shaft 1-1, a support bearing 3-4 is installed on the steering column 5, so that the force generated by the braking force on the motor shaft 1-1 is transmitted to the steering column 5 through the support bearing 3-4.

[0040] The steering column 5 can provide different adaptive interfaces according to the suspension form. Figure 5 One of the double wishbone connection is shown. The boss 5-1 can be connected with the upper and lower wishbone and the steering swing arm, etc.

[0041] The motor is driven by high-voltage direct current. The present application adopts double three-phase motor to reduce the phase current. Therefore, two DC cable junction boxes 1-2 and 1-3 are arranged under the boss 5-1 of the steering column 5, which can partially shield rain and dust and protect the electrical interface.

[0042] The key points of the present embodiment are:

[0043] 1. An electric wheel device comprising a high-power motor, a multi-stage reducer with large speed ratio, a service brake and a parking brake.

[0044] 2. The configuration is that the brake is arranged inside the vehicle, the motor is arranged in the middle, and the reducer is arranged outside the vehicle.

[0045] 3. The motor is a water-cooled motor, which is an independent whole and is fixed on the reducer housing through bolts and flanges, can be assembled and pulled out, and is convenient for maintenance of the motor.

[0046] 4. The motor adopts double three-phase current input to reduce the current of each phase.

[0047] 5. The service brake and the parking brake are arranged at the high-speed end, connected with the motor output shaft through spline, and an additional bearing is installed on the motor output shaft to bear the bending moment generated by the brake on the output shaft, so as to realize the decoupling of the force bending and torsion of the output shaft.

[0048] 6. The taper bearing is used as the wheel hub bearing to bear the lateral and vertical force from the tire. The outer ring of the bearing is connected to the wheel hub by bolts, and the inner ring of the wheel hub is connected to the reducer housing. The bearing is arranged in the middle to ensure the vertical force of the electric wheel is evenly distributed.

[0049] 7. For the multi-planet row and multi-bearing in the oil stirring lubrication condition, the oil return flow channel is designed on the wall surface of the reducer housing to increase the amount of lubricating oil available for the bearing.

[0050] 8. A protruding structure is designed in the middle of the opposite wheel hub bearings to reduce the amount of lubricating oil used while ensuring that the wheel hub bearings can be fully lubricated.

[0051] 9. The electric wheel is fixed to the suspension through the steering column 5. The steering column 5 can be adapted according to different suspension forms. The suspension connection structure can also be designed directly on the reducer housing.

Claims

1. An electric wheel for a mine car, characterized in that, It comprises a wheel hub motor (1), a planetary reducer (2), a brake (3), a wheel (4) and a steering column (5). The planetary reducer (2) comprises a reducer housing (2-1), a wheel hub bearing (2-2), a wheel hub (2-3), a flange (2-6), a gear outer ring (2-8), a first-stage sun gear (2-9), a last-stage carrier (2-10) and an output connecting disc (2-11). The reducer housing (2-1) is supported in the wheel hub (2-3) through the wheel hub bearing (2-2); the reducer housing (2-1) is internally provided with multiple-stage planetary rows; the wheel hub bearing outer ring is connected with the wheel hub (2-3), and the wheel hub (2-3) inner ring is connected with the reducer housing; the first-stage sun gear (2-9) of the planetary reducer (2) is connected with the output shaft of the wheel hub motor (1), the last-stage carrier (2-10) of the planetary reducer (2) is connected with the output connecting disc (2-11), and the output connecting disc (2-11) is fixedly connected with the wheel hub (2-3). The gear outer ring (2-8) is fixedly connected with the reducer housing (2-1) and serves as a gear ring of each planetary row. The flange (2-6) is fixed at the right end of the reducer housing (2-1), the flange (2-6) is fixedly connected with the wheel hub motor (1), the steering column (5) is connected with the flange (2-6), and the wheel hub motor (1) is arranged between the steering column (5) and the reducer housing (2-1). The brake (3) comprises a service brake (3-1), a parking brake (3-2) and a brake disc (3-3); the brake disc (3-3) is connected with the output shaft of the wheel hub motor, the service brake (3-1) and the parking brake (3-2) are fixed on the steering column (5), and the steering column (5) is fixedly connected with the suspension.

2. The electrically driven wheel for mine cars as claimed in claim 1, characterized in that The wheel hub motor (1) is driven by high-voltage direct current and adopts double three-phase current input.

3. The electrically driven wheel for mine cars as claimed in claim 1, characterized in that, The reducer housing (2-1) is internally provided with a backflow oil channel (2-13).

4. The electrically motorized wheel for mine cars as claimed in claim 1, characterized in that, The reducer housing (2-1) is internally provided with three-stage planetary rows.

5. The electrically motorized wheel for mine cars as claimed in claim 1, characterized in that, The steering column (5) is provided with a boss.

6. The electrically motorized wheel for mine cars as claimed in claim 1, characterized in that, The wheel hub bearing (2-2) is provided with a protruding structure in the middle.

7. The electrically motorized wheel for mine cars as claimed in claim 1, characterized in that, The electric wheel is fixed on the suspension through the steering column (5).

8. The electrically motorized wheel for mine cars as claimed in claim 1, characterized in that, The service brake (3-1) and the parking brake (3-2) are arranged at the high-speed end.

9. The electrically motorized wheel for mine cars as claimed in claim 1, characterized in that, The brake is arranged on the inner side of the vehicle, and the planetary reducer is arranged on the outer side of the vehicle.

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