High-speed electrically-driven wheel side assembly capable of bearing fluctuation load of motor and electric vehicle

Abstract

The invention discloses a high-speed electrically-driven wheel side assembly capable of bearing the fluctuation load of a motor and an electric vehicle, and the high-speed electrically-driven wheel side assembly capable of bearing the fluctuation load of the motor comprises the motor provided with a brake device; and the speed reducer is in transmission connection with the output end of the motor through a spline housing assembly and a flexible supporting structure. The problems of vibration and noise of a transmission system caused by fluctuation load of a high-speed motor and abrasion of a long shaft and an end cover are solved, meanwhile, oil stirring and belt discharge loss of a wet brake under the high-speed working condition can be avoided, and the operation efficiency of a speed reducer is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of engineering machinery, and in particular relates to a high-speed electric drive wheel assembly and an electric vehicle capable of withstanding fluctuating loads of a motor. Background Art

[0002] With the popularization of new energy, the drive system of construction machinery vehicles is developing towards electric drive; the output speed of the motor is getting higher and higher. Due to its inherent characteristics, the output torque of the motor is a fluctuating load, which brings vibration and noise problems to the reducer. The conventional reducer structure can no longer meet the needs of electric drive, and a new type of reducer structure needs to be designed to meet market demand.

[0003] In the existing technology, the braking device of the electric-driven travel reducer assembly for engineering machinery generally adopts a wet braking form and is placed at the input end of the reducer. Due to the oil stirring loss and belt displacement of the friction plate, the power loss will increase, resulting in excessive temperature rise; the interface of the input end of the traditional hydraulic-driven reducer adopts a rigid connection, which cannot eliminate the vibration and abnormal noise caused by the motor's own fluctuating load under high-speed and heavy-load conditions to the reducer, and can only be fine-tuned by means such as shaping; as the output speed of the motor increases, the speed difference between the reducer input shaft and the rear end cover increases, resulting in increased wear on the rear end cover. Summary of the Invention

[0004] In order to address the deficiencies in the prior art, the present invention provides a high-speed electric drive wheel assembly and an electric vehicle that can withstand fluctuating loads of a motor, thereby solving the vibration and noise problems of the transmission system and the wear problems of the long shaft and the end cover caused by the fluctuating loads of the high-speed motor. At the same time, it can avoid the oil stirring and belt loss of the wet brake under high-speed working conditions, thereby improving the operating efficiency of the reducer.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: In a first aspect, an electric drive wheel assembly is provided, comprising: a motor equipped with a braking device; and a reducer transmission-connected to the output end of the motor via a spline sleeve assembly and a flexible support structure.

[0006] Furthermore, the reducer includes a first-stage planetary mechanism, a second-stage planetary mechanism, and a third-stage planetary mechanism that are sequentially connected in transmission. The first-stage planetary mechanism, the second-stage planetary mechanism, and the third-stage planetary mechanism are coupled and output through several inner gear rings. Several of the inner gear rings are sequentially spaced and connected to the output flange to form the output end of the reducer, and the rear end cover assembly is installed at the output end of the reducer.

[0007] Furthermore, the spline sleeve assembly includes: a spline sleeve, one end of the spline sleeve is engaged with the external spline of the motor output shaft through an internal spline, and the other end of the spline sleeve is engaged with the external spline of the bearing support through an internal spline, and the internal spline of the bearing support is engaged with the external spline of the first-stage gear shaft of the first-stage planetary mechanism.

[0008] Furthermore, the first-stage gear shaft of the first-stage planetary mechanism is axially limited by a gasket and an inner retaining ring at the shaft end on one side of the spline sleeve assembly.

[0009] Furthermore, the flexible support structure includes: a bearing mounted on a bearing support, an outer ring of the bearing mounted on a bearing seat, and the bearing seat mounted on a support shaft through a flexible material.

[0010] Furthermore, the flexible material is an O-ring, and the O-ring is installed in an O-ring groove on the bearing seat.

[0011] Furthermore, the bearing is an angular contact ball bearing.

[0012] Furthermore, the bearing is axially fixed by a locking nut.

[0013] Furthermore, the braking device includes a caliper brake.

[0014] In a second aspect, an electric vehicle is provided, wherein the electric vehicle is equipped with the electric drive wheel side assembly described in the first aspect.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention is equipped with a motor with a braking device; a reducer that is connected to the output end of the motor through a spline sleeve assembly and a flexible support structure; it solves the vibration and noise problems caused by the fluctuating load of the high-speed motor to the transmission system and the wear problems of the long shaft and the end cover, and at the same time can avoid the oil stirring and belt loss of the wet brake under high-speed conditions, thereby improving the operating efficiency of the reducer. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of a high-speed electric drive wheel assembly capable of withstanding motor fluctuating loads, provided by an embodiment of the present invention; Figure 2 is a schematic diagram of a spline sleeve assembly and a flexible support structure in an embodiment of the present invention; In the figure: 1. Braking device; 2. Motor; 3. Spline sleeve assembly; 31. Spline sleeve; 32. Motor output shaft; 33. Bearing support; 34. First-stage gear shaft; 35. Gasket; 36. Inner retaining ring; 4. Flexible support structure; 41. Bearing seat; 42. Bearing; 43. Flexible material; 44. Locking nut; 5. First-stage planetary mechanism; 6. Second-stage planetary mechanism; 7. Third-stage planetary mechanism; 8. Output flange; 9. Support mechanism; 91. Support shaft; 10. Rear end cover. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0018] Example 1 like Figure 1 、 Figure 2 As shown, a high-speed electric drive wheel assembly that can withstand fluctuating loads of the motor includes: a motor 2 equipped with a braking device 1; and a reducer that is transmission-connected to the output end of the motor 2 through a spline sleeve assembly 3 and a flexible support structure 4.

[0019] like Figure 1 As shown, the present invention mainly includes a motor assembly, a flexible support structure 4, and a planetary gear coupling transmission part. Specifically, it includes: a brake device 1, a motor 2, a spline sleeve assembly 3, a flexible support structure 4, a first-stage planetary mechanism 5, a second-stage planetary mechanism 6, a third-stage planetary mechanism 7, an output flange 8, a support mechanism 9, and a rear end cover 10. The first-stage planetary mechanism 5, the second-stage planetary mechanism 6, and the third-stage planetary mechanism 7 are coupled to each other through an inner ring gear. The output end is composed of three inner ring gears and an output flange 8 connected in sequence with bolts. The rear end cover assembly is fixed to the rightmost end of the entire housing by bolts, forming the entire rotating output housing. The brake device 1 is arranged at the motor end to solve the problems of oil stirring loss and belt discharge caused by wet brakes at high speeds. In the present invention, the brake device 1 adopts a caliper brake.

[0020] like Figure 2 As shown, the structure of the spline sleeve assembly 3 specifically includes: connecting the splines of the motor output shaft 32 and the splines of the bearing support 33 through the spline sleeve 31; the splines of the bearing support 33 are composed of internal splines and external splines, the external splines of the bearing support 33 are connected to the internal splines of the spline sleeve 31, and the internal splines of the bearing support 33 are connected to the external splines of the first-stage gear shaft 34; the external splines of the bearing support 33 and the first-stage gear shaft 34 at the reducer end are meshed, and there is no speed difference between the two; therefore, at its left end, axial limitation is performed by a gasket 35 and an inner retaining ring 36 to solve the problem of severe wear of the reducer long shaft and the rear end cover 10 at high speed.

[0021] like Figure 2As shown, the structure of the flexible support structure 4 specifically includes: the first-stage gear shaft 34 of the reducer is connected to the bearing support 33 via a spline fit. The inner and outer rings of two angular contact ball bearings 42 are respectively installed in the bearing support 33 and the bearing seat 41, and are axially fixed by a lock nut 44. The bearing seat 41 is installed in the support shaft 91, thereby providing radial support for the gear shaft. The bearing seat 41 is installed on the support shaft 91 through a flexible material 43. In the present invention, the flexible material 43 is an O-ring. The outer cylindrical surface of the bearing seat 41 has multiple O-ring grooves, each of which is equipped with an O-ring. The bearing seat 41 and the support shaft 91 are clearance-fitted, and the deformation of the O-ring is used to achieve contact, thereby achieving the purpose of flexible support, solving the vibration and noise problems caused by the fluctuating load of the high-speed motor on the transmission system, and improving the load-sharing characteristics of the first-stage planetary gear.

[0022] The transmission route of the high-speed electric drive wheel assembly for engineering machinery of the present invention is: high-speed motor (including brake) → first-stage spline cylinder → second-stage spline cylinder → first-stage sun gear → first-stage planetary carrier (part of which is converged by the first-stage internal gear ring to the housing output) → second-stage sun gear → second-stage planetary carrier (part of which is converged by the second-stage internal gear ring to the housing output) → third-stage sun gear → third-stage internal gear ring → housing output.

[0023] The electric drive wheel side assembly of the present invention is composed of a planetary gear coupling transmission line; placing the braking device at the motor end can effectively solve the oil stirring loss caused by the wet brake at the reducer end at high speed; by designing a flexible radial support structure at the connection between the motor and the reducer, the vibration and noise problems caused by the fluctuating load of the high-speed motor on the transmission system are solved, and the load-sharing characteristics of the first-stage planetary gear are improved; the input long shaft of the reducer and the motor are connected with a two-stage spline sleeve, which improves the load-bearing capacity and shock-absorbing effect of the spline, and realizes axial limitation of the input long shaft gear and the second-stage spline sleeve (the two are relatively stationary), solving the wear problem of the long shaft and the end cover at high relative speed.

[0024] Example 2 Based on the high-speed electric drive wheel assembly capable of withstanding motor fluctuating loads as described in Example 1, this embodiment provides an electric vehicle, which is equipped with the high-speed electric drive wheel assembly capable of withstanding motor fluctuating loads as described in Example 1.

[0025] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An electric drive wheel assembly, characterized in that: include: A motor (2) equipped with a brake device (1); A reducer is transmission-connected to the output end of the motor (2) via a spline sleeve assembly (3) and a flexible support structure (4).

2. The electric drive wheel assembly according to claim 1, characterized in that: The reducer comprises a first-stage planetary mechanism (5), a second-stage planetary mechanism (6), and a third-stage planetary mechanism (7) which are sequentially connected in a transmission manner. The first-stage planetary mechanism (5), the second-stage planetary mechanism (6), and the third-stage planetary mechanism (7) are coupled to output via a plurality of inner gear rings. The plurality of inner gear rings and the output flange (8) are sequentially connected at intervals to form an output end of the reducer. The rear end cover assembly is mounted on the output end of the reducer.

3. The electric drive wheel assembly according to claim 2, characterized in that: The spline sleeve assembly (3) comprises a spline sleeve (31), one end of the spline sleeve (31) meshing with the external spline of the motor output shaft (32) via an internal spline, the other end of the spline sleeve (31) meshing with the external spline of the bearing support (33) via an internal spline, and the internal spline of the bearing support (33) meshing with the external spline of the first-stage gear shaft (34) of the first-stage planetary mechanism (5).

4. The electric drive wheel assembly according to claim 3, characterized in that: The first-stage gear shaft of the first-stage planetary mechanism (5) is axially limited at the shaft end on one side of the spline sleeve assembly (3) by a gasket (35) and an inner retaining ring (36).

5. The electric drive wheel assembly according to claim 3, characterized in that: The flexible support structure (4) comprises: a bearing (42) mounted on a bearing support (33); an outer ring of the bearing (42) is mounted on a bearing seat (41); and the bearing seat (41) is mounted on a support shaft (91) via a flexible material (43).

6. The electric drive wheel assembly according to claim 5, characterized in that: The flexible material (43) is an O-ring, and the O-ring is installed in an O-ring groove on the bearing seat (41).

7. The electric drive wheel assembly according to claim 5, characterized in that: The bearing is an angular contact ball bearing.

8. The electric drive wheel assembly according to claim 5, characterized in that: The bearing is axially fixed by a locking nut (44).

9. The electric drive wheel assembly according to claim 1, characterized in that: The braking device (1) comprises a caliper brake.

10. An electric vehicle, characterized in that: The electric vehicle is equipped with the electric drive wheel assembly according to any one of claims 1 to 9.

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