CN115765288A - Wheel-side driving system - Google Patents

Abstract

The application discloses wheel limit actuating system includes: the wheel driving device, the motor device and the electromagnetic braking device; the motor device comprises a motor stator, a motor rotor, a motor shell and a motor shaft; the electronic stator and the electronic rotor are accommodated in the motor shell, and the motor shaft and the motor rotor form rotation stopping connection so that the motor shaft is synchronously rotated by the motor rotor when the motor device is electrified; the motor shaft is rotationally connected with the motor shell; both ends of the motor shaft are respectively extended out of the motor housing so that a first end portion of the motor shaft can be locked by the electromagnetic brake device and a second end portion of the motor shaft is used for outputting torque to the wheel drive device. The beneficial effect of this application lies in providing one kind through carrying out high-efficient distribution and using the axial position of motor shaft thereby improve the wheel limit actuating system of motor shaft axial load distribution rationality.

Description

Wheel driving system

Technical Field

The application relates to the technical field of wheel edge driving, in particular to a wheel edge driving system.

Background

In the field of new energy automobile driving, the application of a distributed wheel edge driving technology is particularly important. Compared with the traditional automobile system, the wheel-side driving system reduces devices such as a differential mechanism and the like, so that the wheel-side driving system has the advantages of small volume, light weight, high efficiency, high integration level and the like.

In the related art, the wheel-side drive system often has functions of torque output, speed regulation, and braking.

In the related art, for example, in the wheel-side drive assembly described in chinese patent document CN 113511064A, the electromagnetic braking mechanism is located inside the wheel-side drive assembly, so that the whole motor shaft is long, and the load caused by the wheels (via the planetary gears of the speed adjusting mechanism) and the brake disc is concentrated on one side of the motor shaft during braking, and when braking and starting are frequently performed, the motor shaft is prone to local stress concentration due to torque variation, thereby affecting the service life of the motor shaft.

In addition, the heat of the motor shaft caused by braking and the motor can be concentrated to further deteriorate the working environment of the motor shaft, and the service life of the motor shaft is adversely affected.

In order to solve the problem of unreasonable arrangement of a motor shaft in the related art, an effective solution is not provided at present.

Disclosure of Invention

This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.

Some embodiments of the present application provide a wheel-side drive system, comprising: a wheel drive unit for providing a mounting structure to mount a wheel and drive the wheel unit; the motor device is used for converting electric energy into mechanical energy and driving the wheel driving device to rotate; the electromagnetic braking device is used for converting electric energy into magnetic energy so as to indirectly prevent the wheel driving device from rotating; the motor device comprises a motor stator, a motor rotor, a motor shell and a motor shaft; the electronic stator and the electronic rotor are accommodated in the motor shell, and the motor shaft and the motor rotor form rotation stopping connection so that the motor shaft is synchronously rotated by the motor rotor when the motor device is electrified; the motor shaft is rotationally connected with the motor shell; both ends of the motor shaft are respectively extended out of the motor housing so that a first end portion of the motor shaft can be locked by the electromagnetic brake device and a second end portion of the motor shaft is used for outputting torque to the wheel drive device.

Further, the electromagnetic braking device includes: the first brake disc is used for being mounted on the motor shaft and is in rotation stopping connection with the motor shaft; the dynamic friction disc at least has a contact position or a separation position relative to the first brake disc, the dynamic friction disc is contacted with the first brake disc when in the contact position, and the dynamic friction disc is separated from the first brake disc when in the separation position; an electromagnetic coil for generating a magnetic field for moving the dynamic friction disk to the disengaging position when the electromagnetic coil is energized; wherein the first brake disk is provided with a movable disk keyhole, and the first end of the motor shaft is configured to have a transmission key capable of being matched with the movable disk keyhole.

Further, the wheel-side driving system further includes:

a holding member for being fitted to the motor shaft and exerting a force for maintaining the attitude of the first brake disk at least in a direction opposite to the force exerted by the biasing member;

a shaft end piece for limiting the position of the first brake disc on a side of the first brake disc remote from the holder;

wherein the first brake disc is arranged between the retainer and the shaft end piece.

Further, the wheel-side driving system further includes:

the limiting piece is sleeved on the motor shaft to limit the position of the retaining piece;

wherein, the motor shaft is equipped with first shaft shoulder step, and the locating part setting is between retainer and first shaft shoulder step.

Further, the motor apparatus further includes:

a support bearing sleeved to the motor shaft to enable the motor shaft to rotate relative to the motor shell;

a bearing pressure plate for limiting the relative position of the support bearing and the motor housing in the axial direction of the motor shaft;

wherein, the motor shaft is provided with a second shoulder step, and at least one supporting bearing is clamped to the second shoulder step.

Further, the motor housing is formed with a bearing inner groove to receive and position the support bearing inside the motor housing.

Further, a bearing pressure plate is fixed to the notch of the bearing inner groove.

Further, the wheel-side driving system further includes: the speed regulating device is used for regulating the rotating speed of the wheel driving device relative to the motor device; the speed regulation device comprises a planetary gear, a planetary gear carrier, an inner gear ring and a speed regulation shell; the planetary gear is rotationally connected to the planet carrier, the planet carrier is rotationally connected with the speed regulation shell, and the planet gear is engaged with the inner gear ring; the second end of the motor shaft is configured with a gear tooth that can mate with the planetary gear.

Further, the wheel driving device comprises a mounting flange; wherein the mounting flange and the planet wheel carrier form a rotation-stopping connection, and the mounting structure is constructed as a mounting bolt fixedly connected to the mounting flange.

Further, the wheel-side driving system further includes: the hydraulic braking device is used for converting potential energy into mechanical energy so as to directly prevent the wheel driving device from rotating; the wheel driving device comprises or is connected with a second brake disc, and the second brake disc is fixedly connected with the mounting flange; the hydraulic brake device includes a caliper for clamping the second brake disc.

The beneficial effect of this application lies in: a wheel-side drive system is provided that improves the rationality of the distribution of axial loads of a motor shaft by efficiently distributing and applying the axial position of the motor shaft.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the application and to enable other features, objects, and advantages of the application to be more apparent. The drawings and the description of the exemplary embodiments of the present application are provided for explaining the present application and do not constitute an undue limitation on the present application.

Further, throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic and that elements and components are not necessarily drawn to scale.

In the drawings:

FIG. 1 is a schematic overall block diagram of a wheel-side drive system according to an embodiment of the present application;

FIG. 2 is a schematic view of the internal structure of the wheel-side drive system shown in FIG. 1;

FIG. 3 is an enlarged schematic view of a portion of FIG. 2;

FIG. 4 is an enlarged schematic view of another portion of FIG. 2;

FIG. 5 is a perspective view of a portion of the motor arrangement of the wheel-side drive system shown in FIG. 1;

FIG. 6 is a perspective view of another perspective of the portion of the motor arrangement of the wheel-side drive system shown in FIG. 1;

FIG. 7 is a perspective view of a portion of the electromagnetic braking device of the wheel-side drive system shown in FIG. 1;

FIG. 8 is a schematic structural view of the main chassis shown in FIG. 7;

FIG. 9 is an exploded view of the main chassis shown in FIG. 7;

FIG. 10 is a schematic structural view of the motor end cover shown in FIG. 7;

FIG. 11 is a schematic structural view of the end housing of FIG. 7;

FIG. 12 is a schematic view of the structure of a portion of the component of FIG. 7;

fig. 13 is a schematic view of the internal structure of an electromagnetic brake device in the wheel-side drive system shown in fig. 1;

FIG. 14 is an exploded schematic view of a portion of the construction of the wheel-side drive system shown in FIG. 1;

FIG. 15 is a schematic perspective view of a retainer in the wheel drive system of FIG. 1;

FIG. 16 is a schematic perspective view of a portion of a reduction gear unit in the wheel-side drive system of FIG. 1;

FIG. 17 is an exploded schematic view of a portion of the reduction unit in the wheel-side drive system of FIG. 1;

FIG. 18 is a perspective view of another portion of the wheel-side drive system shown in FIG. 1;

FIG. 19 is a schematic structural view of a mounting flange, a planet carrier and a second brake disk in the wheel-side drive system of FIG. 1;

FIG. 20 is a perspective view of a portion of the hydraulic brake device in the wheel side drive system shown in FIG. 1;

FIG. 21 is a perspective view of yet another portion of the wheel-side drive system shown in FIG. 1;

FIG. 22 is a perspective view of the governor housing of the wheel drive system shown in FIG. 1;

FIG. 23 is a schematic plan view of one side of the speed housing shown in FIG. 22;

FIG. 24 is a schematic plan view of the other side of the governor housing of FIG. 22;

fig. 25 is a perspective view of the governor housing of fig. 22 viewed from the other side.

The reference numerals in the figures have the meaning:

100. a wheel-side drive system;

200. an electromagnetic braking device;

201. a first brake disk; 2011. a movable disk keyhole;

202. a dynamic friction disk; 2021. a disc edge gap;

203. an electromagnetic coil;

204. an end housing; 2041. a magnet slot; 2042. a biasing groove; 2043. a thread groove;

205. a guide sleeve;

206. a guide bolt;

207. a static friction disk; 2071. a disc edge gap; 2072. a disk through hole;

208. a transition housing;

209. a shaft end piece;

210. a stopper;

211. opening the groove;

212. an end bolt;

213. a biasing member;

214. a holder; 141. a contact surface;

215. a shaft end bolt; 300. a motor device;

301. a motor shaft; 3011. a first end portion; 3012. a second end portion; 3013. a drive key; 3014. a transmission gear; 3015. A first shoulder step; 3016. a second shoulder step; 3017. a shaft center hole; 3018. a central axis;

302. a motor stator;

303. a motor rotor;

304. a motor housing; 3041. a main chassis; 3042. an inner shell; 3042a, inner shell ribs; 3042b, cooling the interlayer with liquid; 3042c, a first bearing inner groove; 3042d, a first axle hole; 3043. an outer shell; 3043a, a first liquid flow orifice; 3043b, a second liquid flow orifice; 3044. a motor end cover; 3044a, a second bearing inner groove; 3044b, a second shaft hole;

305. a first limit bearing;

306. a second limit bearing;

307. a bearing pressure plate;

308. a platen bolt;

309. a support bearing;

400. a speed regulating device;

401. a speed regulating housing; 4011. a rotation stopping groove; 4012. an installation part; 4012a, mounting groove; 4013. mounting a column; 4013a, mounting screw holes; 4013b, direction of extension, 4014, inclined wall surface; 4015. an arc wall surface; 4016. a straight wall surface;

402. an inner gear ring;

403. a planetary gear;

404. a planet carrier; 4041. a wheel carrier portion; 4042. a gear portion; 4042a, gear structure;

405. a rotation stopping pin;

500. a wheel drive device;

501. installing a flange; 5011. driving the internal teeth; 5012. the flange is raised; 5013. a gear ring structure;

502. installing a bolt;

503. axis of symmetry

600. A hydraulic brake device;

601. a second brake disc; 6011. embedding the groove;

602. a brake caliper;

6021. a brake pad.

Detailed Description

Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present disclosure are shown in the drawings, it is to be understood that the disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It should be understood that the drawings and the embodiments of the disclosure are for illustration purposes only and are not intended to limit the scope of the disclosure.

It should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings. The embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict.

In the description of the present application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the product of the application is used, the description is only for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation and be operated, and thus, should not be construed as limiting the present application. Furthermore, the appearances of the terms "first," "second," and the like in the description herein are only used for distinguishing between similar elements and are not intended to be construed as indicating or implying relative importance.

In the description of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present application will be understood as specific cases by those of ordinary skill in the art

It is noted that references to "a" or "an" modification in this application are intended to be illustrative rather than limiting, and those skilled in the art will appreciate that references to "one or more" are intended to be exemplary unless the context clearly indicates otherwise.

The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Referring to fig. 1 to 24, an exemplary wheel-side drive system 100 of the present application includes the following main components: electromagnetic brake device 200, motor device 300, speed regulation device 400, wheel drive device 500 and hydraulic brake device 600.

The main portions of the wheel edge drive system 100 of the present application will be described in detail below with reference to the drawings attached hereto.

Wheel driving device

The wheel driving apparatus 500 is used to provide a mounting structure for mounting a wheel (not shown, the same applies below) and driving the wheel. Specifically, the wheel driving device 500 is used for realizing torque output, i.e. realizing installation and directly driving a wheel of a vehicle, and the wheel driving device 500 may be connected with a hub of the wheel so as to drive the wheel to rotate.

As a specific aspect, as shown in fig. 1, 2, and 19, the wheel drive apparatus 500 includes: a mounting flange 501 and a plurality of mounting bolts 502. The mounting flange 501 serves to provide a mounting carrier for the mounting bolt 502, and the mounting bolt 502 is used to form a fastening connection with the wheel so as to mount the wheel.

It should be noted that the mounting bolts 502 can mount wheels of various specifications, so that the wheel drive device 500 can meet various mounting requirements.

Motor device

The motor device 300 is used for converting electric energy into mechanical energy and driving the wheel driving device 500 to rotate. The motor device 300 is used as a power source in the wheel rim driving system 100, and enables the wheel rim driving system 100 to independently drive the output torque required for the wheels when the power source is supplied.

Referring to fig. 1, 2, 4, 5, and 6, the motor apparatus 300 includes: motor shaft 301, motor stator 302, motor rotor 303 and motor housing 304.

Wherein, the motor shaft 301 and the motor rotor 303 form a rotation stopping connection, so that the motor shaft 301 is driven by the motor rotor 303 to rotate synchronously when the motor device 300 is electrified; the motor shaft 301 is connected to the motor housing 304 in a rotatable manner, i.e. the motor shaft 301 can rotate relative to the motor housing 304.

Preferably, both ends of the motor shaft 301 are connected to the electromagnetic braking device 200 and the speed adjusting device 400, respectively. Both ends of the motor shaft 301 respectively protrude out of the motor housing 304, i.e., in the axial direction of the motor shaft 301 (i.e., the axial direction of the central axis 3018), the projection of the motor housing 304 is located within the projection range of the motor shaft 301.

The first end portion 3011 of the motor shaft 301 can be used for being locked by the electromagnetic brake device 200 to brake by the above design, while the second end portion 3012 of the motor shaft 301 is used for outputting torque to the wheel drive device 500. Both ends of the motor shaft 301 extend out of the motor housing 304 and are connected to the electromagnetic braking device 200 and the speed adjusting device 400, respectively.

Specifically, one end of the motor shaft 301 connected to the electromagnetic brake device 200 is defined as a first end portion 3011, and the other end of the motor shaft 301 connected to the speed adjusting device 400 is defined as a second end portion 3012.

In order to achieve the transmission of torque, the first end portion 3011 and the second end portion 3012 of the motor shaft 301 are provided with a transmission structure. Specifically, the first end 3011 of the motor shaft 301 is provided with a driving key 3013, and the second end 3012 of the motor shaft 301 is provided with a driving tooth 3014.

As a specific solution, the motor device 300 is configured as an inner rotor motor, i.e. the rotor of the motor device 300 is located inside the stator.

The wheel-side driving system 100 of the present application uses the motor shaft 301 to constitute the motor device 300, the electromagnetic braking device 200 and the speed regulating device 400 as an organic whole, and uses the inner rotor motor structure to facilitate such structure and the combination of the motor shaft 301 and the motor rotor 303.

The motor housing 304 encloses an inner space for accommodating the motor stator 302 and the motor rotor 303, the motor stator 302 is fixedly arranged in the inner space of the motor housing 304, and the motor rotor 303 is sleeved on the motor shaft 301 to form a rotation-stopping connection.

The motor rotor 303 is rotatably arranged in the motor housing 304 by means of the motor shaft 301, i.e. the motor rotor 303 is rotationally connected to the motor housing 304.

As a more specific aspect, referring to fig. 3, 4 to 9, 12 and 16, the motor apparatus 300 further includes: at least one support bearing 309. The support bearing 309 is used for supporting the rotation of the motor shaft 301 relative to the housing, and specifically, at least two support bearings 309 are sleeved on the motor shaft 301 to realize the rotation connection between the motor shaft 301 and the housing 304. The motor shaft 301 is supported by the support bearing 309 to be rotatable about a central axis 3018 relative to the motor housing 304. Here, the specific scheme of the support bearing 309 is a ball bearing scheme well known to those skilled in the art, and will not be described herein.

The motor shaft 301 is formed with a first shoulder 3015 and a second shoulder 3016 that cooperate with the stepped structures of the first bearing inner groove 3042c and the second bearing inner groove 3044a, respectively, in the motor housing 304 to limit the axial position of the support bearing 309.

Specifically, the two support bearings 309 snap into a first shoulder 3015 and a second shoulder 3016, respectively.

Preferably, in order to limit the axial position of the motor shaft 301 better, as shown in fig. 2 and 5, the motor apparatus 300 further includes: a bearing pressure plate 307, the bearing pressure plate 307 serving to restrict the relative position of the support bearing 309 and the motor housing 304 in the axial direction of the motor shaft 301 (i.e., in the axial direction of the center axis 3018).

More specifically, the bearing pressure plate 307 is configured as an annular structure, and the motor shaft 301 passes through the bearing pressure plate 307 and is rotatable within the annular structure of the bearing pressure plate 307. The bearing pressure plate 307 is fixed to the motor housing 304 (inner housing 3042) by at least two pressure plate bolts 308, and the inner edge of the annular structure of the bearing pressure plate 307 interferes with the support bearing 309 in the radial direction (also, the central axis 3018) of the motor shaft 301, so that the bearing pressure plate 307 is restricted in the axial position on one side of the support bearing 309 by contacting with the support bearing 309, and the other side of the support bearing 309 is restricted by the motor housing 304, that is, the axial position of the support bearing 309 with respect to the central axis 3018 is fixed by the bearing pressure plate 307 and the motor housing 304 from both sides. After the support bearing 309 has a fixed axial position, the two support bearings 309 and the first and second shoulder steps 3015 and 3016 form a limiting function, so that the motor shaft 301 has a determined axial position relative to the whole motor housing 304, and axial movement of the motor shaft 301 and the support bearing 309 is avoided.

As an alternative, a bearing pressure plate 307 can be provided at the other support bearing 309 instead of the bearing pressure plate 307 in the exemplary embodiment shown to achieve an axial positioning of the motor shaft 301, i.e. one bearing pressure plate 307 is still used but is used to limit the position of the other support bearing 309.

As an extension, one bearing pressure plate 307 may be disposed at the other support bearing 309 to limit the support bearing 309 respectively with the bearing pressure plate 307 in the present illustrated embodiment, so as to achieve the axial positioning of the motor shaft 301, that is, two bearing pressure plates 307 may be used to limit the position of two support bearings 309 respectively.

In general, the bearing pressure plate 307 may be fixed to a notch of the first bearing inner groove 3042c or the second bearing inner groove 3044a.

As a preferable mode, referring to fig. 2, 5 to 9, the motor housing 304 includes: a main chassis 3041 and a motor end cover 3044.

The main housing 3041 is configured to form most of the inner space of the motor housing 304, and the motor end cover 3044 is used to close the opening formed by the main housing 3041, such a split structure can facilitate installation of other components of the motor apparatus 300.

As a further preferable aspect, the main chassis 3041 includes: an inner casing 3042 and an outer casing 3043, wherein the inner casing 3042 is formed with a plurality of inner casing ribs 3042a, a liquid cooling interlayer 3042b is formed between the inner casing 3042 and the outer casing 3043, the liquid cooling interlayer 3042b is used to contain liquid required by liquid cooling, such as water and other coolants, the inner casing ribs 3042a are used to guide the liquid flow, the outer casing 3043 is formed with a first liquid flow pipe port 3043a and a second liquid flow pipe port 3043b, one of which is used to guide the liquid flow, and the other is used to guide the liquid flow, so as to implement liquid cooling heat dissipation for the electric machine 300.

Specifically, the motor housing 304 is formed with at least one bearing inner groove (a first bearing inner groove 3042c, a second bearing inner groove 3044 a) to accommodate and position the support bearing 309 inside the motor housing 304.

Preferably, the inner housing 3042 is formed with a first shaft hole 3042d for the motor shaft 301 to pass through, and a groove structure is formed around the first shaft hole 3042d to mount the support bearing 309, i.e., a first bearing inner groove 3042c; correspondingly, the motor end cover 3044a is formed with a second shaft hole 3044b for the motor shaft 301 to pass through, and a groove structure is formed around the second shaft hole 3044b to mount the other support bearing 309, i.e., the second bearing inner groove 3044a. The first bearing inner groove 3042c and the second bearing inner groove 3044a may be respectively formed by forming an annular step projection structure inward of the inner housing 3042 and the motor end cover 3044.

Based on the size difference between the inner casing 3042 and the motor end cover 3044 in the axial direction, as a preferred embodiment, only one bearing pressure plate 307 is provided, and the bearing pressure plate 307 is fixed to the inner casing 3042 by a pressure plate bolt 308, and since the inner casing 3042 is thick, the connection of the bearing pressure plate 307 is stable, so that the effect of preventing axial movement is ensured.

By adopting the inner casing 3042 and the outer casing 3043, the cooling requirement of the motor apparatus 300 can be considered on the basis of ensuring the structural strength of the main casing 3041, and it is necessary to effectively dissipate heat of the motor apparatus 300 due to the application scenario of the wheel driving system 100.

Preferably, the motor end cover 3044 is fixedly connected to the inner casing 3042 by a bolt connection, which enables the inner casing 3042 to have a larger wall thickness, thereby ensuring the stability of the fixing of the motor end cover 3044, and also enabling the inner casing 3042 to easily form the inner casing rib 3042a.

Speed regulating device

The speed adjusting device 400 is used for adjusting the rotation speed of the wheel driving device 500 relative to the motor device 300.

The governor device 400 is generally used to reduce the rotational speed of the motor shaft 301 so that the wheel-side drive system 100 outputs a higher torque. Of course, the speed control device 400 may also realize a speed control function from a low speed to a high speed.

Referring to fig. 1, 2, and 17 to 22, the governor device 400 includes: a speed regulating housing 401, an annulus gear 402, three planetary gears 403 and a planet carrier 404.

The speed adjusting housing 401 is fixedly mounted to the motor housing 304 by bolts, and specifically, the speed adjusting housing 401 is directly fixedly connected to the inner housing 3042 by bolts (not shown).

A space for accommodating the ring gear 402, the pinion gears 403, and the carrier 404 is formed between the governor housing 401 and the inner housing 3042.

The advantage of this solution is that the inner casing 3042 is reused, and the speed regulating casing 401 is directly connected to it, so that the components required for speed regulation can be directly installed between them, and thus when the maintenance is needed, the modular maintenance of the speed regulating device 400 can be realized by directly opening the speed regulating casing 401.

The ring gear 402 is arranged inside the speed regulation housing 401 and forms a rotation stop connection with the speed regulation housing 401, the planetary gears 403 are respectively connected to the planetary carrier 404 in a rotating manner, the gear teeth of the planetary gears 403 are engaged with the internal teeth of the ring gear 402 so that the planetary carrier 404 can rotate relative to the speed regulation housing 401, and the planetary carrier 404 rotates around the central axis 3018; meanwhile, the planetary carrier 404 and the wheel drive 500 form a rotation stop connection, so that the wheel drive 500 is driven to rotate around the central axis 3018 when the planetary carrier 404 rotates, and specifically, the planetary carrier 404 and a mounting flange 501 in the wheel drive 500 directly form a rotation stop connection.

It should be noted that the rotation-stop connection in the present application means that the two connected objects cannot rotate relatively.

The three planetary gears 403 are arranged on the periphery of the second end portion 3012 of the motor shaft 301 and are in meshed connection with the motor shaft 301; the gear teeth 3014 of the second end 3012 of the motor shaft 301 are engaged with the gear teeth of the three planetary gears 403. Thus, when motor shaft 301 rotates, planetary carrier 404 is driven to rotate at a lower rotational speed according to the planetary transmission principle.

Preferably, a plurality of inner ring grooves (not marked in the figure) are formed on the outer side of the inner ring gear 402, and a rotation stopping pin 405 is arranged in each inner ring groove; correspondingly, a plurality of rotation stopping grooves 4011 are formed in the inner side of the speed regulating shell 401, the rotation stopping pins 405 are partially accommodated in the grooves of the inner gear ring 402 and partially accommodated in the rotation stopping grooves 4011, so that the inner gear ring 402 cannot rotate relative to the speed regulating shell 401, and rotation stopping connection is achieved.

Preferably, planet carrier 404 comprises two parts: a wheel carrier portion 4041 and a gear portion 4042.

Wherein, the carrier part 4041 is formed with a frame structure for rotationally connecting the planetary gear 403; the gear portion 4042 is formed with a gear structure 4042a that mates with the drive mounting flange 501. Correspondingly, the mounting flange 501 is formed with corresponding ring gear structures 5013 to enable torque transfer.

Other available technical solutions for implementing the speed regulation of the speed regulation device 400 are known to those skilled in the art, and are not described herein.

Electromagnetic brake device

The electromagnetic brake device 200 is used to convert electric energy into magnetic energy to indirectly prevent the wheel drive device 500 from rotating.

As a general application of the electromagnetic brake device 200, the electromagnetic brake device 200 is used for braking when a vehicle is parked. Of course, in some cases, the electromagnetic braking device 200 may also perform the function of auxiliary braking.

Specifically, referring to fig. 1, 2, and 10 to 16, the electromagnetic brake device 200 includes: a first brake disk 201, a dynamic friction disk 202, an electromagnetic coil 203, a biasing member 213, a retaining member 214, an end housing 204, a guide sleeve 205, a guide bolt 206, a static friction disk 207, a transition housing 208, an end piece 209, and a stop member 210.

Specifically, the first brake disk 201 is provided with a rotor key hole 2011, and the first brake disk 201 is sleeved on the motor shaft 301 through the rotor key hole 2011.

The rotor key apertures 2011 are formed with key structures that mate with the drive keys 3013 of the first end portion 3011 of the motor shaft 301, such that the first brake disk 201 is locked to the motor shaft 301, i.e., the first brake disk 201 rotates synchronously with the motor shaft 301.

Thus, when a resistance force acts on the first brake disk 201, the resistance force also acts on the motor shaft 301. Of course, other structures may be adopted to realize the sleeving and rotation stopping connection of the first brake disc 201 to the motor shaft 301, which is a technical solution known to those skilled in the art and will not be described herein.

The dynamic friction disc 202 is movably connected with the first brake disc 201, so that the dynamic friction disc 202 at least has a contact position or a separation position relative to the first brake disc 201, the dynamic friction disc 202 is in contact with the first brake disc 201 in the contact position, and the dynamic friction disc 202 is separated from the first brake disc 201 in the separation position.

The dynamic friction disk 202 is provided to be slidable in an axial direction (an axial direction of the center axis 3018, the same applies hereinafter) so as to have at least a contact position or a disengagement position with respect to the first brake disk 201, the dynamic friction disk 202 being in contact with the first brake disk 201 in the contact position, and the dynamic friction disk 202 being disengaged from the first brake disk 201 in the disengagement position. Meanwhile, the dynamic friction disk 202 and the end housing 204 form a rotation stop connection, so that when contacting the first brake disk 201, it applies a resistance force to the first brake disk 201 against its rotation due to a frictional force.

Since the first brake disk 201 is also slidable in an axial direction to a limited extent with respect to the motor shaft 301, the above-mentioned contact position and disengagement position do not refer to an absolute position, but two (or more) relative positions of the dynamic friction disk 202 with respect to the first brake disk 201.

The electromagnetic coil 203 is used to generate a magnetic field that moves the dynamic friction disk 202 to the disengaged position when it is energized; the biasing member 213 is adapted to apply a force to the dynamic friction disc 202 to urge the dynamic friction disc 202 towards the contact position.

Specifically, the dynamic friction disk 202 is configured to have a magnetic material so that it can be driven by a magnetic field when the magnetic field of the electromagnetic coil 203 is changed. The biasing member 213 biases the dynamic friction disk 202 toward the first brake disk 201 by a spring force through direct contact with the dynamic friction disk 202. When the electromagnetic coil 203 does not generate a magnetic field, the dynamic friction disc 202 contacts the first brake disc 201 due to the action of the biasing member 213 to achieve a braking effect, and when the braking effect needs to be released, the electromagnetic field generates a magnetic field that attracts the dynamic friction disc 202 to overcome the action of the biasing member 213 to move the dynamic friction disc 202 out of contact with the first brake disc 201.

Preferably, the biasing member 213 is configured as a coil spring, the end housing 204 is configured with a plurality of biasing grooves 2042, the biasing grooves 2042 are configured to accommodate at least a portion of the biasing member 213, the biasing member 213 is at least partially accommodated in the biasing grooves 2042 and is configured to come into contact with the dynamic friction disk 202, and further, the coil springs as the biasing members 213 are respectively accommodated in the biasing grooves 2042.

The guide sleeve 205 is used for guiding the movement of the dynamic friction disc 202 so as to enable the dynamic friction disc 202 to be in sliding connection with the end shell 204; the guide bolt 206 is used to fix the guide sleeve 205 to the end housing 204 such that the guide sleeve 205 is disposed on the outer periphery of the electromagnetic coil 203.

The end housing 204 is further configured with a number of threaded grooves 2043 for mating with the guide bolts 206; the guide bolt 206 is provided with an external thread, and the thread groove 2043 is provided with an internal thread that matches the external thread of the guide bolt 206.

Preferably, as shown in fig. 11 to 13, the dynamic friction disc 202 is configured as an annular disc-shaped structure, and the edge thereof is provided with a plurality of rim notches 2021, and the guide sleeve 205 passes through the rim notches 2021 to provide a guide function for the sliding of the dynamic friction disc 202. More specifically, the guide sleeve 205 is provided with a pipe hole, and the guide bolt 212 is connected to the end casing 204 after passing through the plate through hole 2072 of the static friction plate 207 and the guide sleeve 205 in sequence, thereby functioning to connect the static friction plate 207 and the dynamic friction plate 202 and making them form a rotation-stop connection with the end casing 204.

Specifically, the static friction disc 207 and the end housing 204 constitute a fixed connection to contact the first brake disc 201 when the dynamic friction disc 202 contacts and biases the first brake disc 201 to a preset position; wherein, the first brake disc 201 is slidably disposed between the dynamic friction disc 202 and the static friction disc 207.

The transition housing 208 is used for surrounding at least the first brake disk 201 to accommodate the first brake disk 201 in a closed space; wherein the transition housing 208 is configured as an annular structure and is disposed between the end housing 204 and the static friction disk 207.

Preferably, the static friction disk 207 is also configured as an annular disk structure, and the edge thereof is provided with a plurality of disk edge notches 2071, and another part of the guide bolt 212 and the guide sleeve 205, which are integrated, passes through the static friction disk 207 through the disk edge notches 2071.

The retaining member 214 is adapted to be fitted to the motor shaft 301 and to apply a force to the first brake disc 201 at least in a direction opposite to the force applied by the biasing member 213.

One effect of the force applied to the first brake disk 201 by the holding member 214 is to maintain the posture of the first brake disk 201, preventing the first brake disk 201 from swinging left and right (left and right directions in the perspective shown in fig. 2) to make contact with other components to generate frictional noise. Another effect of the force applied by the holder 214 to the first brake disk 201 is that the holder 214 also applies a resilient force that allows it to be centered and reset out of contact with the static friction disk 207. Namely, the holding member 214 is used for being sleeved on the motor shaft 301 and applying a force for holding the posture of the first brake disk 201 to the first brake disk 201 at least in the direction opposite to the direction of the force applied by the biasing member 213; and for being fitted to the motor shaft 301 and exerting a force on the first brake disc 201 that maintains the attitude of the first brake disc 201, at least in the direction opposite to that exerted by the biasing member 213.

Specifically, the dynamic friction disk 202 is disposed between the first brake disk 201 and the electromagnetic coil 203; the first brake disk 201 is disposed between the dynamic friction disk 202 and the holder 214. That is, as shown in fig. 2, the electromagnetic coil 203, the dynamic friction disk 202, the first brake disk 201, the retaining member 214, and the stopper member 210 are arranged in this order from left to right.

Preferably, the static friction disk 207 is configured in an annular structure, so that the motor shaft 301 and the retaining member 214 and the limiting member sleeved on the motor shaft 301 can pass through the static friction disk 207, so that in the axial direction, the retaining member 214, the limiting member 210 and other components are arranged to overlap with the static friction disk 207 and share the same axial position, so that the wheel-rim driving system 100 of the present application is more compact in size in the axial direction.

Specifically, in order to limit the axial position of the retaining member 214, the retaining member 210 is sleeved on the motor shaft 301, one end surface of the retaining member 210 contacts with a step structure (not shown) of the motor shaft 301, and the other end surface contacts with the retaining member 214, so that the retaining member 214 is limited between the retaining member 210 and the first brake disc 201. Preferably, the retaining member 210 is disposed between the retaining member 214 and the first shaft shoulder 3015.

Alternatively, the holder 214 may employ a coil spring. However, due to the limitation of axial space and for better dynamic balance, it is preferable that the holding member 214 is configured to have at least one contact surface 141 obliquely intersecting with the movement direction of the dynamic friction disk 202, so that the holding member 214 can be shifted and deflected to realize adaptive dynamic balance adjustment when the motor shaft 301 and the first brake disk 201 integrally rotate at high speed.

As a particularly preferred version, the retaining member 214 is configured as a wave washer, as shown in fig. 15 and 16.

To limit the axial position of the first brake disc 201 from the other side of the first brake disc 201, the shaft end piece 209 is fixedly connected to the first end 3011 of the motor shaft 301 by a shaft end bolt 215; the shaft end piece 209 serves to limit the position of the first brake disc 201 on the side of the first brake disc 201 remote from the holder 214. First brake disc 201 is disposed between retainer 214 and shaft end member 209.

The end housing 204 and the transition housing 208 form a space for accommodating the above components, and similar to the speed adjusting device 400, the electromagnetic brake device 200 also uses a motor end cover 3044 of the motor device 300, the end housing 204 is fastened to the motor end cover 3044 by an end bolt 212, and the transition housing 208 is disposed between the static friction disk 207 and the end housing 204, and is clamped by the two parts to complete the fixation.

Specifically, the end housing 204 is configured with a magnet slot 2041 for receiving at least a portion of the electromagnetic coil 203, and the electromagnetic coil 203 is at least partially received in the magnet slot 2041.

More specifically, the magnet groove 2041 is an annular recess whose opening is disposed on the side facing the motor unit 300, and preferably, the magnet groove 2041 has a depth adapted to the electromagnetic coil 203 such that the electromagnetic coil 203 is completely accommodated in the magnet groove 2041.

Specifically, the dynamic friction disk 202 is disposed at the notch of the magnet groove 2041, and the dynamic friction disk 202 is at least partially exposed from the end housing 204 in the axial direction, i.e., the dynamic friction disk 202 is not accommodated in the magnet groove 2041, but is disposed outside the magnet groove 2041.

Preferably, the end housing 204 is configured to have a ring-shaped configuration and the end housing 204 is configured. The end housing 204 and the dynamic friction disk 202 are both annular structures so that the electromagnetic brake device 200 forms an open groove 211 exposing the motor shaft 301.

Preferably, in order to dissipate heat of the motor device 300 and the electromagnetic brake device 200, the motor shaft 301 is provided with a shaft hole 3017 at the first end 3011 thereof, and the wheel-side driving system 100 is integrally formed with an open slot 211, the open slot 211 can expose the shaft hole 3017 at the side of the wheel-side driving system 100 where the electromagnetic brake device 200 is provided, and the open slot 211 is surrounded by at least the electromagnetic coil 203 and the dynamic friction disk 202. Accordingly, the dynamic friction disk 202 and the first brake disk 201 are accommodated in a space surrounded by the transition housing 208, that is, in the axial direction, the dynamic friction disk 202 and the first brake disk 201 correspond to the position of the transition housing 208.

In this way, the open groove 211 has a large size, so that the first brake disc 201 is exposed in the open groove 211 in a large area, and the inner edge of the dynamic friction disc 202 is also exposed in the open groove 211, so that heat can be dissipated through the open groove 211 in time when heat is generated by friction between the first brake disc and the dynamic friction disc, and the transition housing 208 has a small thickness and is made of a material which is easy to dissipate heat, so that the outer edge portions of the dynamic friction disc 202 and the first brake disc 201 can dissipate heat through the transition housing 208. Axial hole 3017 of motor shaft 301

By adopting the scheme, the electromagnetic braking device 200 is convenient to overhaul and can effectively dissipate heat. Moreover, the electromagnetic braking device 200 is highly modularized, and is convenient to produce and maintain.

Hydraulic brake device

The hydraulic brake device 600 serves to convert potential energy into mechanical energy to directly prevent the wheel drive device 500 from rotating, and in general, the hydraulic brake device 600 serves to perform a braking function.

Referring to fig. 19 to 25, the hydraulic brake device 600 includes: a second brake disc 601 and a brake caliper 602. Specifically, the second brake disk 601 is connected to the wheel drive device 500 in a rotation stop manner.

More specifically, the second brake disc 601 is fixedly connected to the mounting flange 501 by bolts (not shown). More specifically, in order to enhance the stability of torque transmission, the edge of the mounting flange 501 is formed with a plurality of flange protrusions 5012 protruding outward; correspondingly, the second brake disk 601 is configured as an annular structure, and the second brake disk 601 is formed with a plurality of embedding grooves 6011 at the inner edge of the annular structure for matching with the flange protrusions 5012, and the matching of the flange protrusions 5012 to the embedding grooves 6011 can improve the braking effect, not only by transmitting the torque through the fastening of the bolts.

The second brake disc 601 may adopt the general solution of brake discs in caliper brakes, such as a sandwich design, etc., which is well known to those skilled in the art and will not be described herein.

Specifically, the brake caliper 602 includes: two brake pads 6021 that can be hydraulically driven to embrace the second brake disc 601 are provided on both sides of the second brake disc 601, respectively. This is also a solution known to the person skilled in the art and will not be described in further detail here.

Preferably, in order to better mount the brake caliper 602 and improve the degree of modularity of the wheel side drive system 100 to provide universal mounting capability, as shown in fig. 22 to 23, the speed control housing 401 is configured to have two mounting portions 4012 for mounting the brake caliper 602, and the two mounting portions 4012 are disposed at two different circumferential positions with respect to the motor shaft 301.

As a concrete aspect, each of the mounting portions 4012 includes: two mounting posts 4013, two sloped walls 4014, a curved wall 4015, and a straight wall 4016. Wherein, two inclined wall surfaces 4014 and an arc wall surface 4015 have formed a mounting groove 4012a that is located between two erection columns 4013, and erection column 4013 is equipped with installation screw 4013a, so mounting groove 4012a also sets up between two installation screw 4013a, and this mounting groove 4012a is open on one side in the axial, and the opposite side is sealed by straight wall surface 4016, can follow the open one side installation brake caliper 602 of mounting groove 4012a like this. Both mounting posts 4013 are formed with mounting screw holes 4013a, and the brake caliper 602 can be fixedly mounted by the cooperation of bolts and the mounting screw holes 4013 a.

Preferably, the straight wall 4016 is perpendicular to the axis of the motor shaft 301, and one straight wall 4016 is disposed between two inclined walls 4014 such that the mounting groove 4012a is constructed in an open structure at the other side opposite to the straight wall 4016.

Specifically, the inclined wall surface 4014 is parallel to the central axis 3018, which is the rotation axis of the motor shaft 301, and one inclined wall surface 4014 in one mounting portion 4012 obliquely intersects the other inclined wall surface 4014.

Preferably, a plurality of mounting screw holes 4013a in one mounting portion 4012 have the same extension direction 4013b, so that the brake caliper 602 can be mounted in the extension direction 4013 b. The mounting screw holes 4013a of the two different mounting portions 4012 have different extending directions 4013b so as to be mounted to different mounting portions 4012 at different angles. In this way, the wheel side drive system 100 of the present application can be made to function as a drive unit for left and right wheels by being mounted on different mounting portions 4012.

Preferably, the two mounting portions 4012 form a mirror symmetry with respect to a symmetry axis 503, the symmetry axis 503 is arranged perpendicular to the central main line, and the central axis 3018 intersects the symmetry axis 503. Can be according to the required position of installing the wheel of wheel driving system 100 like this, select corresponding installation department 4012, make it can install on the vehicle left side also can install on the vehicle right side through the rotation of wheel driving system 100 angle like this, improved wheel driving system 100's universality greatly. As a further preferred option, other configurations of the wheel rim drive system 100 may also constitute mirror symmetry with respect to the axis of symmetry 503.

The main components of the rim drive system 100 have been described and illustrated.

Integral layout

The overall layout of the rim drive system 100 is explained below.

Referring to fig. 1, 2, 11, 14, 15, 17, 19, and 22, a motor device 300 in the present application is provided between an electromagnetic brake device 200 and a wheel drive device 500; the speed regulating device 400 is arranged between the motor device 300 and the wheel driving device 500; the governor device 400 is provided between the motor device 300 and the hydraulic brake device 600. That is, the electromagnetic brake device 200, the motor device 300, the speed control device 400, and the wheel drive device 500 are arranged in this order from left to right with reference to the perspective shown in fig. 2. In this arrangement, the motor arrangement 300 is disposed between the mounting flange 501 and the electromagnetic coil 203, and the first brake disk 201 is disposed between the electromagnetic coil 203 and the wave washer.

This arrangement is advantageous in that the electromagnetic brake device 200 for parking is easily repaired, and the motor device 300 and the speed adjusting device 400, which need to ensure assembly accuracy, are not frequently disassembled due to the need to repair the electromagnetic brake device 200, and the electromagnetic brake device 200 can be repaired and replaced as an independent module. Similarly, since the wheel driving device 500 is located such that the hydraulic brake device 600 is also located at the outermost side of the wheel-side driving system 100, such an arrangement also facilitates the maintenance and replacement of the hydraulic brake device 600. Adopt such design to make this application rational in infrastructure and be convenient for maintain.

As another design point of the wheel-side driving system 100 of the present application, the electromagnetic braking device 200 and the speed adjusting device 400 of the present application are both designed to reuse the housing structure of the motor device 300, which is advantageous in that the structure of the wheel-side driving system 100 is more compact, and independent disassembly of each device can be performed modularly according to maintenance needs without affecting other parts.

The foregoing description is only exemplary of the preferred embodiments of the disclosure and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention in the embodiments of the present disclosure is not limited to the specific combinations of the above-mentioned features, and other embodiments in which the above-mentioned features or their equivalents are combined arbitrarily without departing from the spirit of the invention are also encompassed. For example, the above features and (but not limited to) technical features with similar functions disclosed in the embodiments of the present disclosure are mutually replaced to form the technical solution.

Claims (10)

1. A wheel rim drive system, comprising:

a wheel drive unit for providing a mounting structure to mount a wheel and drive the wheel unit;

the motor device is used for converting electric energy into mechanical energy and driving the wheel driving device to rotate;

the method is characterized in that:

the wheel-side drive system further includes:

the electromagnetic braking device is used for converting electric energy into magnetic energy so as to indirectly prevent the wheel driving device from rotating;

the motor device comprises a motor stator, a motor rotor, a motor shell and a motor shaft; the electronic stator and the electronic rotor are accommodated in the motor shell, and the motor shaft and the motor rotor form a rotation-stopping connection so that the motor shaft is synchronously rotated by the motor rotor when the motor device is electrified; the motor shaft is rotationally connected with the motor shell;

both ends of the motor shaft respectively protrude out of the motor housing so that a first end portion of the motor shaft can be locked by the electromagnetic brake device and a second end portion of the motor shaft is used to output torque to the wheel drive device.

2. The wheel-side drive system according to claim 1, wherein:

the electromagnetic braking device includes:

the first brake disc is used for being mounted on the motor shaft and is in rotation-stopping connection with the motor shaft;

a dynamic friction disc at least having a contact position or a disengagement position with respect to the first brake disc, the dynamic friction disc being in contact with the first brake disc when in the contact position, the dynamic friction disc being disengaged from the first brake disc when in the disengagement position;

an electromagnetic coil for generating a magnetic field when energized to move the dynamic friction disk to the disengaged position;

wherein the first brake disk is provided with a movable disk keyhole, and the first end of the motor shaft is configured to have a transmission key capable of being matched with the movable disk keyhole.

3. The wheel-side drive system according to claim 2, wherein:

the wheel-side drive system further includes:

a holding member for being fitted to the motor shaft and exerting a force for maintaining the attitude of the first brake disk at least in a direction opposite to the force exerted by the biasing member;

a shaft end piece for restricting a position of the first brake disc on a side of the first brake disc remote from the holder;

wherein the first brake disk is disposed between the retainer and the shaft end piece.

4. The wheel-side drive system according to claim 3, wherein:

the wheel-side drive system further includes:

a limiting member for being fitted to the motor shaft to limit a position of the holder;

the motor shaft is provided with a first shaft shoulder step, and the limiting part is arranged between the retaining part and the first shaft shoulder step.

5. The wheel-side drive system according to claim 4, wherein:

the motor apparatus further includes:

the support bearing is sleeved on the motor shaft so that the motor shaft and the motor shell form a rotating connection;

a bearing pressure plate for restricting a relative position of the support bearing and the motor housing in an axial direction of the motor shaft;

wherein the motor shaft is provided with a second shoulder step, and at least one of the support bearings is snapped to the second shoulder step.

6. The wheel-edge drive system according to claim 5, wherein:

the motor housing is formed with at least one bearing inner groove to receive and locate the support bearing inside the motor housing.

7. The wheel-edge drive system according to claim 6, wherein:

the bearing pressure plate is fixed to a notch of the bearing inner groove.

8. The wheel-side drive system according to claim 1, wherein:

the wheel-side drive system further includes:

the speed regulating device is used for regulating the rotating speed of the wheel driving device relative to the motor device;

the speed regulating device comprises a planetary gear, a planetary gear carrier, an inner gear ring and a speed regulating shell; the inner gear ring is arranged in the speed regulation shell and is in rotation stopping connection with the speed regulation shell, the planetary gear is rotationally connected to the planetary carrier, the planetary carrier is in rotational connection with the speed regulation shell, and the planetary gear is meshed with the inner gear ring; the second end of the motor shaft is configured with a gear tooth that can mate with the planetary gear.

9. The wheel-side drive system according to claim 8, wherein:

the wheel driving device comprises a mounting flange; wherein the mounting flange and the planet wheel carrier form a rotation-stop connection, and the mounting structure is configured as a mounting bolt fixedly connected to the mounting flange.

10. The wheel-edge drive system according to claim 9, wherein:

the wheel-side drive system further includes:

the hydraulic braking device is used for converting potential energy into mechanical energy so as to directly prevent the wheel driving device from rotating;

the wheel driving device comprises or is connected with a second brake disc, and the second brake disc is fixedly connected with the mounting flange; the hydraulic brake device comprises a brake caliper for the second brake disc 1.

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