Wheel-side electric driving unit

Abstract

The utility model discloses a wheel-side electric drive unit which comprises a shell, an output shaft flange assembly, a speed limiter assembly, a motor rotor assembly, a motor stator and a reduction gear set, wherein the output shaft flange assembly, the speed limiter assembly, the motor rotor assembly, the motor stator and the reduction gear set are arranged in the main shell. The beneficial effects of the utility model are that the wheel-side electric drive unit of the technical scheme adopts a two-stage helical gear to decelerate, a proper reduction ratio can be selected according to actual demands, and a helical tooth arc gear (three-stage) structure is added, so that the advantages of large reduction ratio, stepped large-modulus output large torque, low noise and the like are realized; the motor structure adopts the design of a high-temperature-resistant permanent-magnet direct-current brushless motor, a two-stage cylindrical permanent magnet is arranged at the tail end of a gear shaft of a motor rotor, signals are collected through a magnetic encoder PCB and transmitted to a controller PCB, and accurate control over the torque and clockwise and anticlockwise rotation of the motor is completed; the appearance structure of the product adopts the output design of a rectangular main body and a cylindrical tubular structure, is fixed by a six-hole flange, is novel in modeling, relatively saves materials, and is energy-saving and environment-friendly.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field especially relates to a wheel edge electric drive unit. BACKGROUND

[0002] At present, the market engineering vehicle power mostly adopts the form of hydraulic motor + reducer drive. The hydraulic pump is driven by the motor, and the pressure oil reaches the hydraulic motor through the pipeline, and the wheel moves after the reducer. The above-mentioned structure power transmission is relatively complicated, the power consumption is large, and the installation and wiring are relatively complex and inconvenient, and the maintenance cost is high. Therefore, it is necessary to develop a wheel edge electric drive unit, and the same technical scheme as the utility model has not been found through retrieval. SUMMARY

[0003] The utility model mainly solves the technical problem to provide a wheel edge electric drive unit, solves one or more of the above-mentioned prior art problems.

[0004] To solve the above technical problem, one technical scheme of the utility model is: a wheel edge electric drive unit, the innovation point is: including the shell and the output shaft flange assembly, the speed limiter assembly, the motor rotor assembly, the motor stator and the reduction gear set arranged in the main shell,

[0005] The shell includes the main shell, the upper end cover and the lower end cover, the upper end cover and the lower end cover separate the main shell into the reduction cavity for installing the reduction gear set, the main cavity for installing the motor stator and the motor rotor assembly and the speed limiting cavity for installing the speed limiter assembly,

[0006] The motor stator is fixedly arranged on the inner wall of the main shell, and the two ends of the motor rotor assembly are assembled on the upper end cover and the lower end cover respectively and the middle part penetrates the inner cavity of the motor stator,

[0007] The output shaft flange assembly is installed on the side wall of the main shell and is connected with the motor rotor assembly.

[0008] In some embodiments, the motor rotor assembly includes a motor rotor gear shaft, a rotor body is sleeved on the motor rotor gear shaft, an output rack is arranged on the motor rotor gear shaft, and the two ends of the motor rotor gear shaft are assembled on the upper end cover and the lower end cover respectively.

[0009] In some embodiments, the speed limiter assembly includes an electromagnetic brake arranged on the top of the upper end cover and a tail end cover arranged on the top of the electromagnetic brake.

[0010] In some embodiments, the speed reduction gear set comprises a gear end cover, a primary speed reduction gear set and a secondary speed reduction gear set, the gear end cover is mounted on the main housing, the primary speed reduction gear set comprises a primary speed reduction gear shaft and a primary speed reduction helical gear sleeved on the primary speed reduction gear shaft, the top of the primary speed reduction gear shaft is connected with the lower end cover, and the bottom of the primary speed reduction gear shaft is connected with the gear end cover; the secondary speed reduction gear set comprises a secondary spiral bevel gear shaft and a secondary speed reduction helical gear sleeved on the secondary spiral bevel gear shaft, the top of the secondary spiral bevel gear shaft is connected with the lower end cover, and the bottom of the secondary spiral bevel gear shaft is connected with the gear end cover; the primary speed reduction helical gear and the secondary speed reduction helical gear are meshed with each other, and the gear rack on the primary speed reduction gear shaft is meshed with the output gear rack on the motor rotor gear shaft.

[0011] In some embodiments, the output shaft flange assembly comprises an output shaft and, from inside to outside, a deep groove ball bearing, a spiral bevel gear, an earless retainer, a retainer, a first tapered roller bearing, a flat washer, a second tapered roller bearing, a skeleton oil seal, an output shaft end cover and a hub flange disc sleeved on the output shaft in sequence, the spiral bevel gear is meshed with the secondary spiral bevel gear shaft, the output shaft end cover is fixed on the main housing, and the hub flange disc is also fixed on the main housing.

[0012] In some embodiments, the wheel-side electric drive unit further comprises a controller PCB assembly mounted on the main housing.

[0013] The wheel-side electric drive unit has the advantages that: the wheel-side electric drive unit adopts two-stage helical gear reduction, can select a proper reduction ratio according to actual requirements, adopts a spiral tooth arc gear (3-stage) structure, realizes large reduction ratio, and has the advantages of large modulus output, large torque, low noise and the like; the motor structure adopts a high-temperature-resistant permanent magnet direct-current brushless motor design, the motor rotor gear shaft is provided with two-stage cylindrical permanent magnets at the tail end, signals are collected through a magnetic encoder PCB, and the signals are transmitted to a controller PCB to realize accurate control of the torque of the motor and forward / reverse rotation; the product appearance structure adopts a rectangular main body cylindrical tubular structure output design, is fixed through a 6-hole flange, has novel modeling, and is relatively material-saving, energy-saving and environment-friendly. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating labor, wherein:

[0015] Figure 1 It is an explosion view of the wheel-side electric drive unit.

[0016] Figure 2It is an explosion drawing of a motor rotor assembly of the wheel-side electric drive unit.

[0017] Figure 3 It is an explosion drawing of a speed limiter assembly of the wheel-side electric drive unit.

[0018] Figure 4 It is an explosion drawing of a primary reduction gear set of the wheel-side electric drive unit.

[0019] Figure 5 It is an explosion drawing of a secondary reduction gear set of the wheel-side electric drive unit.

[0020] Figure 6 It is a structural schematic view of a gear end cover of the wheel-side electric drive unit.

[0021] Figure 7 It is an explosion drawing of an output shaft flange set of the wheel-side electric drive unit. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below, obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0023] As shown in Figure 1 The present application embodiment includes: a wheel-side electric drive unit, including a shell and an output shaft flange assembly 500, a speed limiter assembly 700, a motor rotor assembly 300, a motor stator 200 and a reduction gear set arranged in the main shell 100; the shell includes a main shell 100, an upper end cover 101 and a lower end cover, the upper end cover 101 and the lower end cover separate the main shell 100 into a reduction cavity for installing the reduction gear set, a main cavity for installing the motor stator 200 and the motor rotor assembly 300, and a speed limiting cavity for installing the speed limiter assembly 700; the motor stator 200 is fixedly arranged on the inner wall of the main shell 100, both ends of the motor rotor assembly 300 are assembled on the upper end cover 101 and the lower end cover respectively and the middle part penetrates the inner cavity of the motor stator 200; the output shaft flange assembly 500 is installed on the side wall of the main shell 100 and is butted with the motor rotor assembly 300.

[0024] Specifically, as Figure 2As shown, the motor rotor assembly 300 includes a motor rotor gear shaft 301, a rotor body 302 is sleeved on the motor rotor gear shaft 301, an output rack is arranged on the motor rotor gear shaft 301, and the two ends of the motor rotor gear shaft 301 are respectively assembled on the upper end cover 101 and the lower end cover. In the above structure, deep groove ball bearings are arranged between the motor rotor gear shaft 301 and the upper end cover 101 and the lower end cover for assembly.

[0025] Specifically, as shown in Figure 3 , the speed limiter assembly 700 includes an electromagnetic brake 702 arranged on the top of the upper end cover 101 and a tail end cover 701 arranged on the top of the electromagnetic brake 702. In the above structure, the electromagnetic brake 702 is connected with the lower end cover through a hexagonal cylindrical head screw, and the tail end cover 701 is fixedly connected with the main shell 100 through a screw. The working principle of the electromagnetic brake 702 is mainly based on electromagnetic induction and the interaction of current magnetic field, as well as the application of electromagnetic force. The electromagnetic brake 702 includes a fixed iron core and a coil corresponding to the iron core. When the coil is powered, a magnetic field is generated. This magnetic field is transmitted to the moving object through the iron core, thereby generating an induced current. The induced current generates a magnetic field in the object, which interacts with the original magnetic field to form a resistance. This resistance slows down the movement of the object, thereby achieving the effect of braking.

[0026] Specifically, as shown in Figure 4 , Figure 5 and Figure 6 , the speed reducer gear set includes a gear end cover 430 and a first-stage speed reducer gear set 410 and a second-stage speed reducer gear set 420. The gear end cover 430 is installed on the main shell 100. The first-stage speed reducer gear set 410 includes a first-stage speed reducer gear shaft 411 and a first-stage speed reducer helical gear 412 sleeved on the first-stage speed reducer gear shaft 411. The top of the first-stage speed reducer gear shaft 411 is butted against the lower end cover, and the bottom thereof is butted against the gear end cover 430. The second-stage speed reducer gear set 420 includes a second-stage spiral arc gear shaft 421 and a second-stage speed reducer helical gear 422 sleeved on the second-stage spiral arc gear shaft 421. The top of the second-stage spiral arc gear shaft 421 is butted against the lower end cover, and the bottom thereof is butted against the gear end cover 430. The first-stage speed reducer helical gear 412 and the second-stage speed reducer helical gear 422 are meshed with each other. The rack on the first-stage speed reducer gear shaft 411 is meshed with the output rack on the motor rotor gear shaft 301. In the above structure, deep groove ball bearings are arranged between the first-stage speed reducer gear shaft 411 and the lower end cover and the gear end cover 430 for assembly. Deep groove ball bearings are arranged between the second-stage spiral arc gear shaft 421 and the lower end cover and the gear end cover 430 for assembly. The top of the second-stage spiral arc gear shaft 421 is further assembled with an elastic retaining ring 503423.

[0027] Specifically, as shown in Figure 7As shown, the output shaft flange assembly 500 comprises an output shaft 510, and from inside to outside, a deep groove ball bearing, a spiral arc gear 501, an earless retainer 502, a retainer 503, a first tapered roller bearing 504, a flat washer 505, a second tapered roller bearing 506, a skeleton oil seal 507, an output shaft end cover 508, and a hub flange 509 are sleeved on the output shaft 510, the spiral arc gear 501 is meshed with the second spiral arc gear shaft 421, the output shaft end cover 508 is fixed on the main housing 100, and the hub flange 509 is also fixed on the main housing 100, in the above structure, the spiral arc gear 501 is fixed through the deep groove ball bearing, and the spiral arc gear 501 is a key transmission component in the output shaft flange assembly 500. Its tooth line is spiral, and the tooth profile of the gear tooth is arc-shaped. From the structure, its tooth surface is a complex spatial curved surface, and the design of the spiral angle has an important influence on the transmission performance of the gear.

[0028] Specifically, the wheel hub electric drive unit further comprises a controller PCB board assembly 600 mounted on the main housing 100.

[0029] In the above structure, the electric energy output by the battery pack is delivered to the wheel hub motor after being processed by the controller, the torque is output through the motor stator 200 and the motor rotor assembly 300, and then the first reduction gear set 410 and the second reduction gear set 420 are added to the spiral arc gear 501 structure to form three stages, so that the effect of speed reduction and torque increase is achieved, and finally the power is transmitted to the wheel through the hub flange 509.

[0030] The above only describes the embodiments of the present application, and does not limit the patent range of the present application, and any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, is also included in the patent protection range of the present application.

Claims

1. A wheel-side electric drive unit, characterized in that: Includes a housing and an output shaft flange assembly (500), a speed limiter assembly (700), a motor rotor assembly (300), a motor stator (200), and a reduction gear set disposed within the main housing (100); The housing includes a main housing (100), an upper end cover (101), and a lower end cover, the upper end cover (101) and the lower end cover dividing the main housing (100) into a reduction chamber for installing a reduction gear set, a main chamber for installing a motor stator (200) and a motor rotor assembly (300), and a speed limiting chamber for installing a speed limiter assembly (700); The motor stator (200) is fixedly mounted on the inner wall of the main housing (100), and the two ends of the motor rotor assembly (300) are respectively mounted on the upper end cover (101) and the lower end cover, with the middle part passing through the inner cavity of the motor stator (200); The output shaft flange assembly (500) is mounted on the side wall of the main housing (100) and docks with the motor rotor assembly (300).

2. The wheel-side electric drive unit according to claim 1, characterized in that: The motor rotor assembly (300) includes a motor rotor gear shaft (301), on which a rotor body (302) is mounted. An output rack is provided on the motor rotor gear shaft (301), and the two ends of the motor rotor gear shaft (301) are respectively mounted on an upper end cover (101) and a lower end cover.

3. The wheel-side electric drive unit according to claim 1, characterized in that: The speed limiter assembly (700) includes an electromagnetic brake (702) disposed on top of an upper end cover (101) and a tail end cover (701) disposed on top of the electromagnetic brake (702).

4. A wheel-side electric drive unit according to claim 1 or 2, characterized in that: The reduction gear set includes a gear end cover (430), a first-stage reduction gear set (410), and a second-stage reduction gear set (420). The gear end cover (430) is mounted on the main housing (100). The first-stage reduction gear set (410) includes a first-stage reduction gear shaft (411) and a first-stage reduction helical gear (412) mounted on the first-stage reduction gear shaft (411). The top of the first-stage reduction gear shaft (411) is connected to the lower end cover, and its bottom is connected to the gear end cover (430). The second-stage reduction gear set (420)... The reduction gear set (420) includes a secondary helical arc gear shaft (421) and a secondary reduction large helical gear (422) mounted on the secondary helical arc gear shaft (421). The top of the secondary helical arc gear shaft (421) is connected to the lower end cover, and its bottom is connected to the gear end cover (430). The primary reduction large helical gear (412) and the secondary reduction large helical gear (422) mesh with each other. The rack on the primary reduction gear shaft (411) meshes with the output rack on the motor rotor gear shaft (301).

5. The wheel-side electric drive unit according to claim 4, characterized in that: The output shaft flange assembly (500) includes an output shaft (510) and, from the inside to the outside, a deep groove ball bearing, a helical arc gear (501), a lugless retaining ring (502), a retaining ring (503), a first tapered roller bearing (504), a flat washer (505), a second tapered roller bearing (506), a skeleton oil seal (507), an output shaft end cover (508), and a hub flange (509). The helical arc gear (501) meshes with the secondary helical arc gear shaft (421). The output shaft end cover (508) is fixed on the main housing (100), and the hub flange (509) is also fixed on the main housing (100).

6. The wheel-side electric drive unit according to claim 1, characterized in that: The wheel-side electric drive unit also includes a controller PCB board assembly (600) mounted on the main housing (100).

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