Low-floor wheel-side motor drive axle

Abstract

A low-floor wheel-side motor drive axle comprises power assemblies, a cross beam, thrust rod supports, air bag arms and brakes, the power assemblies are detachably installed at the two ends of the cross beam, and the thrust rod supports are arranged above the inner ends of the corresponding power assemblies in a winding mode and fixedly connected to the corresponding ends of the cross beam. The air bag arms are installed on the front side and the rear side of the two ends of the cross beam respectively, the power assembly comprises a motor, a main reduction gear, a box body, a hub assembly and a hub reduction gear assembly, a front end cover of the motor and a gear frame form a base body for installing the main reduction gear, and the main reduction gear is of a single-stage parallel shaft installation structure. According to the utility model, the maintenance convenience is improved; the channel width is increased; the transmission efficiency is improved; the noise is reduced; the weight is reduced; and the reliability is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of automotive drive axles, and particularly relates to a low-floor wheel-side motor drive axle. Background Art

[0002] The main structures of the existing low-floor wheel-side drive axles are as follows. They are composed of a wheel-side drive assembly, an airbag arm, a crossbeam, etc. The crossbeam and the airbag arm are both installed on the left and right wheel-side drive assemblies. The structure is complex. When performing maintenance on the power assembly, the entire axle needs to be removed and then disassembled for repair. At the same time, the main reducer of the traditional system of the existing low-floor wheel-side motor drive axle structure adopts a structure of double-stage parallel shaft gears in series or a planetary drive shunt structure, which occupies a large axial space and has low transmission efficiency. Moreover, the motor of the existing low-floor wheel-side motor drive axle adopts a round wire winding motor, and the motor and the transmission system are of a split structure, with low motor efficiency and heavy motor weight.

[0003] Patent No. 2015107180315 discloses a low-floor drive axle for a bus. One end of the axle housing is connected to a wheel-side reducer assembly, and the other end is connected to a differential assembly. The differential assembly is connected to another wheel-side reducer assembly. Brake assemblies and hub assemblies are respectively connected to the outsides of the two wheel-side reducer assemblies. Cantilevers are symmetrically arranged on both sides of the wheel-side reducer housing of the wheel-side reducer assembly. After the wheel-side reducer housing of the wheel-side reducer assembly is connected to the two cantilevers, it forms a C-shaped structure. An airbag is arranged in the middle of the cantilever, and the front end of the cantilever is connected to the lower end of a shock absorber. A V-shaped thrust rod is connected to the middle of the axle housing, and a parallel thrust rod is arranged on the upper part of the wheel-side reducer housing. In the present invention, on the wheel-side reducer housings at both ends of the axle housing, cantilevers are symmetrically installed on both sides of the wheel-side reducer housing. After the two cantilevers are installed with the wheel-side reducer housing, they are combined into a C-shaped bracket structure, and the original bracket is cancelled, so as to achieve the purpose of reducing the floor height of the bus. However, there are still problems such as complex structure, low transmission efficiency, low motor efficiency, small channel width, and complex maintenance. Summary of the Invention

[0004] To solve the above problems existing in the current technology, the utility model provides a low-floor wheel-side motor drive axle with convenient maintenance, short maintenance working hours, wide channel width, light weight, and high system efficiency.

[0005] The technical solution adopted by the utility model is:

[0006] A low-floor in-wheel motor drive axle, comprising a power assembly, a cross beam, a thrust rod bracket, an airbag arm, and a brake. The power assemblies are detachably installed at both ends of the cross beam. The thrust rod bracket is wound around the upper part of the inner end of the corresponding power assembly and fixedly connected to the corresponding end of the cross beam. The airbag arms are respectively installed on the front and rear sides of both ends of the cross beam. The power assembly includes a motor, a main reduction gear, a housing, a wheel hub assembly, and an in-wheel reducer assembly. The front end cover of the motor and the gear rack form a base for installing the main reduction gear, and the main reduction gear is of a single-stage parallel shaft installation structure.

[0007] Further, the main reduction gear includes a driving wheel and a driven wheel. One end of the driving wheel shaft of the driving wheel is fixed on the gear rack through a bearing, and the other end is inserted into the motor shaft of the motor. The driven wheel meshes with the driving wheel. Both ends of the driven wheel shaft of the driven wheel are respectively installed on the gear rack and the front end cover of the motor through bearings, and the driving wheel shaft and the driven wheel shaft are arranged in parallel. One end of the driving wheel shaft and the motor shaft share a bearing, avoiding the noise problem caused by the overconstraint problem.

[0008] Further, the driving wheel shaft of the driving wheel has a smooth shaft section bracket, and the smooth shaft section bracket is inserted into the inner hole of the motor shaft for positioning.

[0009] Further, the driven wheel is connected to the in-wheel reducer through a spline to transmit power to the in-wheel reducer.

[0010] Further, the wheel hub assembly is connected to the in-wheel reducer, and the brake cooperates with the wheel hub brake disc on the wheel hub assembly to achieve the braking function.

[0011] Further, the front end cover of the motor and the gear rack form a lubrication inner cavity, the front end cover of the motor and the housing form a lubrication outer cavity, and a through hole communicating the lubrication inner cavity and the lubrication outer cavity is provided on the lower side of the front end cover of the motor. After the gear rotates, the gear stirs up the gear oil and splashes it into the upper oil collecting pool. Since the through hole below is small, the oil return speed is low, causing the liquid level in the lubrication inner cavity to drop and the liquid level in the lubrication outer cavity to rise. While ensuring lubrication and the service life of the gear oil, it reduces the oil stirring loss and improves the transmission efficiency.

[0012] Further, an oil collecting pool is provided above the bearing chamber of the gear rack, and the oil collecting pool is communicated with the bearing chamber through a small hole. After the gear oil splashes into the oil collecting pool, it flows back to the bearing chamber through the small hole to lubricate the bearing.

[0013] Further, the junction box of the motor is provided with a cold cavity and a hot cavity. The hot cavity is coated with insulating paint and is closed after the motor is assembled. The cold cavity is provided with terminal posts for installing the three-phase wires of the vehicle section.

[0014] Furthermore, the thrust rod bracket adopts a C-shaped structure, so that it can bypass the powertrain installed on the crossbeam, enabling the left and right powertrains to be disassembled and installed without removing the axle from the vehicle, which is convenient for disassembly and installation.

[0015] Furthermore, the powertrain, the thrust rod bracket, and the airbag arm are all installed on the crossbeam through bolts.

[0016] The beneficial effects of the present utility model are as follows: improving the convenience of maintenance; increasing the channel width; enhancing the transmission efficiency; reducing the noise; decreasing the weight; and improving the reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the present utility model.

[0018] Figure 2 is an exploded structural diagram of the present utility model.

[0019] Figure 3 is a schematic cross-sectional structural diagram of the main reduction gear and the motor of the present utility model.

[0020] Figure 4 is a schematic cross-sectional structural diagram of the main reduction gear of the present utility model.

[0021] Figure 5 is a schematic structural diagram of the gear rack and the front end cover of the motor of the present utility model.

[0022] Figure 6 is a schematic structural diagram of the motor of the present utility model.

[0023] In the figure: 1, powertrain; 11, motor; 111, front end cover; 112, motor shaft; 113, junction box; 114, cold cavity; 115, hot cavity; 116, through hole; 12, main reduction gear; 121, main gear; 122, driven gear; 123, driving wheel shaft; 124, driven wheel shaft; 13, housing; 14, gear rack; 141, bearing chamber; 142, oil sump; 15, lubricating inner cavity; 16, lubricating outer cavity;

[0024] 2, crossbeam; 3, thrust rod bracket; 4, airbag arm; 5, brake. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The present utility model will be further described below in conjunction with specific embodiments, but the present utility model is not limited to these specific embodiments. Those skilled in the art should recognize that the present utility model covers all alternative solutions, improvement solutions, and equivalent solutions that may be included within the scope of the claims.

[0026] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more, unless otherwise clearly defined.

[0027] In the present utility model, unless otherwise clearly specified and defined, the terms such as "installation", "connection", "connection", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0028] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0029] See Figure 1-6 , this embodiment provides a low-floor wheel-side motor drive axle, which includes a power assembly 1, a cross beam 2, a thrust rod bracket 3, an airbag arm 4, and a brake 5. The power assemblies 1 are detachably installed at both ends of the cross beam 2 through bolts, that is, a left power assembly and a right power assembly are provided. The thrust rod bracket 3 is wound around the upper part of the inner end of the corresponding power assembly 1 and is fixedly connected to the corresponding end of the cross beam 2 through bolts. The airbag arms 4 are respectively installed on the front and rear sides of both ends of the cross beam 2 through bolts.

[0030] The thrust rod bracket 3 in this embodiment adopts a C-shaped structure, so that it can bypass the powertrain 1 and be installed on the crossbeam 2, making it unnecessary to remove the axle from the whole vehicle when installing and disassembling the left and right powertrains, which is convenient for disassembly and installation.

[0031] The powertrain 1 in this embodiment includes a motor 11, a main reduction gear 12, a housing 13, a hub assembly, and a wheel side reducer assembly. The front end cover 111 of the motor 11 and the gear bracket 14 form a base for installing the main reduction gear 12. The main reduction gear 12 is a single-stage parallel shaft installation structure. The main reduction gear 12 includes a driving wheel 121 and a driven wheel 122. One end of the driving wheel shaft 123 of the driving wheel 121 is fixed on the gear bracket 14 through a bearing, and the other end is inserted into the motor shaft 112 of the motor 11. The driven wheel 122 meshes with the driving wheel 121 to transmit power. Both ends of the driven wheel shaft 124 of the driven wheel 122 are installed on the gear bracket 14 and the front end cover 111 of the motor 11 through bearings respectively, and the driving wheel shaft 123 and the driven wheel shaft 124 are arranged in parallel. One end of the driving wheel shaft 123 and the motor shaft 112 share a bearing, avoiding the noise problem caused by overconstraint. The driving wheel shaft 123 of the driving wheel 121 has a smooth shaft section bracket, and the smooth shaft section bracket is inserted into the inner hole of the motor shaft 112 for positioning. The driven wheel 122 is connected to the wheel side reducer through a spline to transmit power to the wheel side reducer. The hub assembly is connected to the wheel side reducer, and the brake cooperates with the hub brake disc on the hub assembly to achieve the braking function.

[0032] The front end cover 111 of the motor 11 and the gear bracket 14 in this embodiment form a lubricating inner cavity 15, the front end cover 111 of the motor 11 and the housing 13 form a lubricating outer cavity 16, and a through hole 116 communicating the lubricating inner cavity 15 and the lubricating outer cavity 16 is provided on the lower side of the front end cover 111 of the motor 11. After the gears rotate, the gears stir the gear oil and splash it up, and it splashes into the upper oil sump. Since the through hole 116 below is relatively small, the oil return speed is low, causing the liquid level in the lubricating inner cavity 15 to drop and the liquid level in the lubricating outer cavity 16 to rise. While ensuring lubrication and the service life of the gear oil, it reduces the oil stirring loss and improves the transmission efficiency. An oil sump 142 is provided above the bearing chamber 141 of the gear bracket 14, and the oil sump 142 is communicated with the bearing chamber 141 through a small hole. The gear oil splashes into the oil sump and then flows back to the bearing chamber 141 through the small hole to lubricate the bearings.

[0033] The junction box 113 of the motor 11 in this embodiment is provided with a cold cavity 114 and a hot cavity 115. The hot cavity 115 is coated with insulating paint and is closed after the motor is assembled. The cold cavity 114 is provided with terminal posts for installing the three-phase wires of the vehicle section, which is convenient for vehicle installation.

[0034] The utility model improves the maintainability; increases the channel width; improves the transmission efficiency; reduces the noise; reduces the weight; and improves the reliability.

Claims

1. A low-floor in-wheel motor drive axle, comprising a power assembly, a cross beam, a thrust rod bracket, an airbag arm, and a brake. The power assemblies are detachably installed at both ends of the cross beam. The thrust rod bracket is wound around the upper part of the inner end of the corresponding power assembly and fixedly connected to the corresponding end of the cross beam. The airbag arms are respectively installed on the front and rear sides of both ends of the cross beam. The power assembly includes a motor, a main reduction gear, a housing, a wheel hub assembly, and an in-wheel reducer assembly. It is characterized in that: The front end cover of the motor and the gear carrier form a base for installing the main reduction gear, and the main reduction gear is of a single-stage parallel shaft installation structure.

2. The low-floor wheel-side motor drive axle according to claim 1, characterized in that: The main reduction gear includes a driving wheel and a driven wheel. One end of the driving wheel shaft of the driving wheel is fixed on the gear carrier through a bearing, and the other end is inserted into the motor shaft of the motor; the driven wheel meshes with the driving wheel, and both ends of the driven wheel shaft of the driven wheel are respectively installed on the gear carrier and the front end cover of the motor through bearings, and the driving wheel shaft and the driven wheel shaft are arranged in parallel.

3. The low-floor wheel-side motor drive axle according to claim 2, wherein: The driving wheel shaft of the driving wheel has a smooth shaft section bracket, and the smooth shaft section bracket is inserted into the inner hole of the motor shaft for positioning.

4. The low-floor wheel hub motor drive axle according to claim 2, wherein: The driven wheel is connected to the wheel side reducer through a spline to transmit power to the wheel side reducer.

5. The low-floor wheel hub motor drive axle according to claim 1, wherein: The hub assembly is connected to the wheel side reducer, and the brake cooperates with the hub brake disc on the hub assembly to achieve the braking function.

6. The low-floor wheel-end motor drive axle according to claim 1, wherein: The front end cover and the gear carrier of the motor form a lubrication inner cavity, the front end cover of the motor and the box body form a lubrication outer cavity, and a through hole communicating the lubrication inner cavity and the lubrication outer cavity is provided on the lower side of the front end cover of the motor.

7. The low-floor in-wheel motor drive axle according to claim 6, characterized in that: An oil sump is provided above the bearing chamber of the gear carrier, and the oil sump is communicated with the bearing chamber through a small hole.

8. A low-floor wheel-side motor drive axle according to claim 1, characterized in that: The junction box of the motor is provided with a cold cavity and a hot cavity. The hot cavity is coated with insulating paint and is closed after the motor is assembled, and the cold cavity is provided with terminal posts for installing the three-phase wires of the vehicle section.

9. The low-floor wheel hub motor drive axle according to claim 1, wherein: The thrust rod bracket adopts a C-shaped structure.

10. The low-floor wheel-side motor drive axle according to claim 1, wherein: The power assembly, the thrust rod bracket, and the airbag arm are all installed on the cross beam through bolts.

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