Wheel edge driving system and engineering machinery

Abstract

The invention provides a wheel edge driving system and engineering machinery. A motor module comprises a motor shell and a motor structure accommodated in the motor shell; the braking module comprises a braking shell and a braking structure accommodated in the braking shell; the speed reduction module comprises a speed reduction shell and a speed reduction structure contained in the speed reduction shell, and the braking structure and the speed reduction structure are both connected with a motor shaft of the motor structure; wherein the control shell and the brake shell are both integrally installed outside the motor shell, the brake structure and the controller are electrically connected through a brake signal line, the brake shell and the control shell are both provided with line passing through holes allowing the signal line to penetrate through, the brake signal line is located outside the control shell and the brake shell, and the motor structure and the controller are electrically connected through a line bank. The two ends of the line bank extend into the motor shell and the control shell respectively. A signal wire and a three-phase wire harness of a motor structure are omitted, meanwhile, the length of a brake signal wire of a brake structure can be greatly shortened, cost is reduced, the system integration degree is improved, and the structure is more compact.

Description

Technical Field

[0001] The present invention belongs to the technical field of motor vehicles, and in particular relates to a wheel-side drive system and engineering machinery. Background Art

[0002] The wheels of aerial work platforms and other construction machinery are usually equipped with a wheel drive system for parking brakes. Figure 1 As shown, the motor of the wheel-side drive system outputs power to the reducer and then to the wheels, thereby driving the wheels to rotate. The motor is connected with the brake, and when the car stops, the motor is locked under the force of the brake for parking brake.

[0003] However, the drive and other components of the wheel-side drive system are arranged separately, and the brake and motor are connected to the drive using a signal harness. In addition, the motor needs to be connected to the drive via a three-phase harness. Due to the separate arrangement of the drive and motor, the distance between the drive and the motor is long, and there are longer three-phase harnesses and motor harnesses, and the brake harness is also longer, which increases the cost. As a result, the wheel-side drive system is not only less integrated, occupies more space, but also has a higher cost. Summary of the invention

[0004] The main purpose of the present invention is to provide a wheel-side drive system and engineering machinery, aiming to solve the technical problems in the prior art that the wiring harness of the wheel-side drive system is high in cost and occupies a large space.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a wheel-side drive system, which includes: a control module, including a control housing and a controller accommodated in the control housing; a motor module, including a motor housing and a motor structure accommodated in the motor housing; a brake module, including a brake housing and a brake structure accommodated in the brake housing; a deceleration module, including a deceleration housing and a deceleration structure accommodated in the deceleration housing, and the brake structure and the deceleration structure are both connected to the motor shaft of the motor structure; wherein the control housing and the brake housing are both integrated and installed outside the motor housing, the brake structure and the controller are electrically connected through a brake signal line, the brake housing and the control housing are both provided with a wire through hole for the signal line to pass through, the brake signal line is located outside the control housing and the brake housing, the motor structure and the controller are electrically connected through a terminal block, and the two ends of the terminal block extend into the motor housing and the control housing respectively.

[0006] In the embodiment of the present invention, the control housing, the motor housing, the brake housing and the reduction housing are abutted and connected in sequence along the axial direction of the motor shaft, and the motor shaft passes through the brake housing and is connected to the reduction structure.

[0007] In an embodiment of the present invention, the brake housing includes: a shell body, accommodating the brake structure; an installation outer edge, which is arranged around the outer edge of the shell body on the side away from the motor module, and the installation outer edge and the shell body form an assembly space for the installation tool to extend into, and the installation outer edge is provided with a connecting hole connected to the reduction housing.

[0008] In an embodiment of the present invention, a weight reduction cavity is provided on a side of the mounting outer edge facing the deceleration module; and / or, there are multiple connecting holes, which are arranged at circumferential intervals along the mounting outer edge.

[0009] In an embodiment of the present invention, the braking structure includes: a brake shaft, the motor shaft and the brake shaft are connected by a spline; a friction plate, including a friction main body and a friction outer ring annularly connected to the outer edge of the friction main body, the friction main body is sleeved outside the brake shaft; a brake disc, abutting between the friction outer ring and the brake housing along the axial direction of the motor shaft, and the brake disc is sleeved outside the friction main body.

[0010] In an embodiment of the present invention, the brake housing is provided with a deformation cavity, the brake disc and the friction outer ring are both accommodated in the deformation cavity, the cross-sectional dimension of the brake disc is larger than the cross-sectional dimension of the friction outer ring, and a deformation gap is arranged between the cavity wall of the deformation cavity and the brake disc.

[0011] In the embodiment of the present invention, an opening is provided on a side of the deformation cavity facing the motor module, and the brake module further comprises an end cover which is sealed at the opening and abuts against the friction outer ring to limit the position.

[0012] In an embodiment of the present invention, the end cover is provided with an escape hole for escaping the motor shaft, and the cross-sectional dimension of the escape hole is larger than the cross-sectional dimension of the brake shaft and smaller than the cross-sectional dimension of the friction outer ring.

[0013] In an embodiment of the present invention, the brake shell is further provided with a guide cavity, the deformation cavity and the guide cavity are sequentially connected along the axial direction of the motor shaft and are coaxially arranged, the cross-sectional size of the deformation cavity is larger than the cross-sectional size of the guide cavity, the shape of the guide cavity matches the shape of the friction body, and the friction body partially extends into the guide cavity.

[0014] The present invention also provides an engineering machine, which comprises the wheel-side drive system as described above.

[0015] Through the above technical solution, the wheel side drive system provided by the embodiment of the present invention has the following beneficial effects:

[0016] The four structural components of the control module, the motor module, the brake module and the deceleration module are modularized, so that the controller, the motor structure, the brake structure and the deceleration structure can be accommodated in their respective housings, and can also be integrated through the control housing, the motor housing, the brake housing and the deceleration housing, avoiding the situation in which the components are arranged separately in the prior art, and can connect the motor structure and the controller through the wiring row and the wiring seat, saving the three-phase wire harness and the motor signal line between the motor structure and the controller, and the controller and the brake structure are electrically connected through the brake signal line located outside the control housing and the brake housing, and the external threading can be carried out through the wire through hole, which can facilitate the connection of the brake signal line, and the brake housing and the control housing are integrated into the motor housing, which can greatly shorten the length of the brake signal line between the controller and the brake structure. In the present invention, the four modules of the control module, the motor module, the brake module and the deceleration module are highly integrated, so that the wheel-side drive system is more compact, and the signal line and the three-phase wire harness of the motor structure are cancelled, and the length of the brake signal line of the brake structure can be greatly shortened, which reduces the cost, improves the system integration, and has a more compact structure.

[0017] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide an understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 It is a structural schematic diagram of a wheel-side drive system in the prior art;

[0020] Figure 2 is a schematic structural diagram of a wheel side drive system according to an embodiment of the present invention;

[0021] Figure 3 is a partial cross-sectional structural schematic diagram of a wheel-side drive system according to an embodiment of the present invention;

[0022] Figure 4 is a schematic diagram of the cross-sectional structure of a brake module of a wheel-side drive system according to an embodiment of the present invention;

[0023] Figure 5 is a schematic structural diagram of a wheel-side drive system according to another embodiment of the present invention;

[0024] Figure 6 2 is a schematic structural diagram of a wheel-side drive system according to yet another embodiment of the present invention.

[0025] Description of Reference Numerals

[0026] Label Name Label Name

[0027] 100 Wheel drive system 417 Weight reduction chamber

[0028] 1 Control housing 418 end cover

[0029] 2 Motor housing 419 avoidance hole

[0030] 3 Motor shaft 42 Braking structure

[0031] 4 Braking module 421 Braking shaft

[0032] 41 brake housing 422 friction plate

[0033] 411 deformation cavity 4221 friction body

[0034] 412 guide cavity 4222 friction outer ring

[0035] 413 Shell body 423 Brake disc

[0036] 414 shaft through hole 5 reduction housing

[0037] 415 Install outer edge 6 brake signal line

[0038] 416 connection hole DETAILED DESCRIPTION

[0039] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0040] The wheel side drive system according to the present invention will be described below with reference to the accompanying drawings.

[0041] like Figures 2 to 6As shown, in an embodiment of the present invention, the wheel-side drive system 100 includes a control module, a motor module, a brake module 4 and a deceleration module, the control module includes a control shell 1 and a controller accommodated in the control shell 1; the motor module includes a motor shell 2 and a motor structure accommodated in the motor shell 2; the brake module 4 includes a brake shell 41 and a brake structure 42 accommodated in the brake shell 41; the deceleration module includes a deceleration shell 5 and a deceleration structure accommodated in the deceleration shell 5, and the brake structure 42 and the deceleration structure are both connected to the motor shaft 3 of the motor structure; wherein, the control shell 1 and the brake shell 41 are both integrated and installed outside the motor shell 2, the brake structure 42 and the controller are electrically connected through a brake signal line 6, the brake shell 41 and the control shell 1 are both provided with a wire through hole for the signal line to pass through, the brake signal line 6 is located outside the control shell 1 and the brake shell 41, the motor structure and the controller are electrically connected through a terminal block, and the two ends of the terminal block extend into the motor shell 2 and the control shell 1 respectively. The wiring busbar in this embodiment can be a copper busbar. The copper busbar of the motor structure can extend from the motor housing 2 and extend into the control housing 1 to be connected to the wiring socket of the controller. The speed reduction structure can be a speed reducer.

[0042] In this embodiment, the four structural components of the control module, the motor module, the brake module 4 and the deceleration module are modularized, so that the controller, the motor structure, the brake structure 42 and the deceleration structure can be accommodated in their respective housings, and can also be integrated through the control housing 1, the motor housing 2, the brake housing 41 and the deceleration housing 5, avoiding the situation in which the components are arranged separately in the prior art. The motor structure and the controller can be connected through the terminal block and the terminal block, saving the three-phase wire harness and the motor signal line between the motor structure and the controller. The controller and the brake structure 42 are electrically connected through the brake signal line 6 located outside the control housing 1 and the brake housing 41, and external threading can be performed through the wire through-hole, which can facilitate the connection of the brake signal line 6. The brake housing 41 and the control housing 1 are both integrated in the motor housing 2, which can greatly shorten the length of the brake signal line 6 between the controller and the brake structure 42. In this embodiment, the four modules of control module, motor module, brake module 4 and deceleration module are highly integrated to make the wheel-side drive system 100 more compact, eliminate the signal line and three-phase wiring harness of the motor structure, and greatly shorten the length of the brake signal line 6 of the brake structure 42, thereby reducing costs, improving system integration and making the structure more compact.

[0043] like Figure 1As shown, in one embodiment, the control housing 1, the motor housing 2, the brake housing 41 and the reduction housing 5 are sequentially abutted and connected along the axial direction of the motor shaft 3, and the motor shaft 3 passes through the brake housing 41 and is connected to the reduction structure. The control housing 1, the motor housing 2, the brake housing 41 and the reduction housing 5 are independent of each other, and are sequentially abutted and connected along the axial direction of the motor shaft 3, and can be sequentially fitted from back to front. Each housing can be detachably connected by connecting members such as bolts or screws. The control housing 1, the motor housing 2, the brake housing 41 and the reduction housing 5 are independently arranged to form a modular installation method. Compared with the nested structure, the mutual influence of the assembly between each module can be avoided. In this embodiment, the wheel side drive system 100 is mainly installed in the wheel side space of engineering machinery such as aerial work platforms. The length direction of the wheel side space is consistent with the axial direction of the motor shaft 3. Therefore, the connection method arranged sequentially from front to back in this embodiment can be highly integrated, which is convenient for the assembly and connection of the wheel side drive system 100, and can also make full use of the wheel side space.

[0044] In this embodiment, the control housing 1 is integrated at the rear end of the motor housing 2, the brake housing 41 is installed at the front end of the motor housing 2, and the reduction housing 5 is installed on the brake housing 41, forming a four-in-one integrated structure. The rear end of the brake housing 41 has an axial through hole 414, so that the motor shaft 3 can pass through the brake module 4, extend into the reduction housing 5 and be connected to the input shaft of the reduction structure, which can reduce the three-phase wiring harness between the drive and the motor in the prior art. The controller and the motor structure are connected through an internal wiring row, and the system structure is more compact and smaller in size, occupying less space in the entire vehicle.

[0045] like Figure 5 As shown, in another embodiment, the control housing 1 is installed on the side of the motor housing 2, and the motor housing 2, the brake housing 41 and the reduction housing 5 are sequentially abutted and connected along the axial direction of the motor shaft 3; Figure 6 As shown, in yet another embodiment, the control housing 1 is installed on the side of the motor housing 2 , and the brake housing 41 , the motor housing 2 and the reduction housing 5 are abutted and connected in sequence along the axial direction of the motor shaft 3 .

[0046] In the embodiment of the present invention, the brake housing 41 includes a housing body 413 and an installation outer edge 415. The housing body 413 accommodates the brake structure 42. The installation outer edge 415 is arranged around the outer edge of the housing body 413 on the side away from the motor module. The installation outer edge 415 and the housing body 413 form an assembly space for the installation tool to extend into. The installation outer edge 415 is provided with a connection hole 416 connected to the reduction housing 5. The connection hole 416 in this embodiment can be a bolt hole. The installation outer edge 415 structure connected to the reduction housing 5 is added to the front end of the housing body 413 to be assembled with the reduction housing 5. In this embodiment, the cross-sectional size of the installation outer edge 415 is larger than the cross-sectional size of the housing body 413, so that the installation outer edge 415 and the housing body 413 can form an assembly space for the installation tool to extend into. When assembling the wheel side drive system 100, it can facilitate the operation of the operator. The installation tool can be a wrench for installing bolts, etc.

[0047] In the embodiment of the present invention, a weight-reducing cavity 417 is provided on the side of the mounting outer edge 415 facing the reduction module; and, the number of the connecting holes 416 is multiple, and the multiple connecting holes 416 are arranged at intervals along the circumference of the mounting outer edge 415. The front end of the mounting outer edge 415 in this embodiment is provided with a weight-reducing cavity 417, and the weight-reducing cavity 417 and the mounting outer edge 415 are arranged coaxially, and the cross-sectional size of the weight-reducing cavity 417 is larger than the cross-sectional size of the shell body 413, which can greatly reduce the weight occupied by the mounting outer edge 415. The weight-reducing cavity 417 is provided with an opening facing forward, which can facilitate the extension of the motor shaft 3. The multiple connecting holes 416 in this embodiment are all connected to the reduction shell 5, which can enhance the connection stability between the reduction module and the brake module 4.

[0048] like Figure 3 and Figure 4 As shown, in the embodiment of the present invention, the brake structure 42 includes a brake shaft 421, a friction plate 422 and a brake disc 423, and the motor shaft 3 and the brake shaft 421 are connected by a spline; the friction plate 422 includes a friction body 4221 and a friction outer ring 4222 connected to the outer edge of the friction body 4221, and the friction body 4221 is sleeved outside the brake shaft 421; the brake disc 423 abuts between the friction outer ring 4222 and the brake housing 41 along the axial direction of the motor shaft 3, and the brake disc 423 is sleeved outside the friction body 4221. Specifically, the electromagnet of the brake structure 42 can be electrically connected to the controller through the brake signal line 6. The brake shaft 421 and the motor shaft 3 in this embodiment are connected by splines. When parking, the controller can send a brake signal to the brake structure 42. The brake disc 423 presses the friction outer ring 4222 of the friction plate 422 under the action of the spring in the brake structure 42, so that the friction outer ring 4222 and the friction body 4221 are deformed to drive the brake shaft 421 to lock the motor shaft 3 for parking brake. The friction body 4221 and the friction outer ring 4222 in this embodiment can be an integrated structure, and the various components of the brake structure 42 can be ensured to fit closely through the nested structure.

[0049] In one embodiment, the brake housing 41 is provided with a deformation cavity 411, and the brake disc 423 and the friction outer ring 4222 are both accommodated in the deformation cavity 411. The cross-sectional dimension of the brake disc 423 is larger than the cross-sectional dimension of the friction outer ring 4222, and a deformation gap is provided between the cavity wall of the deformation cavity 411 and the brake disc 423. In this embodiment, the cross-sectional dimension of the brake disc 423 is larger than the cross-sectional dimension of the friction plate 422, and the outer edge of the brake disc 423 protrudes outward relative to the outer edge of the friction outer ring 4222, which can ensure that there is a large contact area between the brake disc 423 and the friction outer ring 4222, and the brake disc 423 can completely cover the front side of the friction outer ring 4222. The cross-sectional dimension of the deformation cavity 411 is larger than the cross-sectional dimension of the brake disc 423, which can provide sufficient deformation space for the deformation of the brake structure 42, avoid the situation where the brake structure 42 is restricted and interfered by the brake housing 41, and improve the smoothness of the use of the brake structure 42.

[0050] Specifically, the deformation cavity 411 is provided with an opening on the side facing the motor module, and the brake module 4 further includes an end cover 418 that is blocked at the opening and abuts against the limiting friction outer ring 4222. The deformation cavity 411 in this embodiment is provided with an opening toward the rear, and the end cover 418 can seal the opening and abut against the limiting friction outer ring 4222. In this embodiment, a bolt hole can be provided on the end cover 418, and the end cover 418 can be connected to the motor housing 2 through the bolt hole on the end cover 418. In this embodiment, the end cover 418 is in a flat plate shape and contacts the motor housing 2 surface.

[0051] In one embodiment, the end cover 418 is provided with an escape hole 419 for escaping the motor shaft 3, and the cross-sectional dimension of the escape hole 419 is larger than the cross-sectional dimension of the brake shaft 421 and smaller than the cross-sectional dimension of the friction outer ring 4222. To facilitate the connection between the end cover 418 and the motor housing 2, the cross-sectional dimension of the end cover 418 is larger than the cross-sectional dimension of the housing body 413, and the outer edge of the end cover 418 protrudes outward relative to the outer edge of the housing body 413. The cross-sectional dimension of the end cover 418 can be smaller than the cross-sectional dimension of the installation outer edge 415. The installation outer edge 415 and the end cover 418 are respectively connected to the front and rear sides of the housing body 413 in the front-to-back direction, which can facilitate the assembly connection between the motor housing 2, the reduction housing 5 and the brake housing 41. The escape hole 419 and the shaft through hole 414 in this embodiment are coaxially arranged, and the size of the shaft through hole 414 can match the cross-sectional dimension of the guide cavity 412.

[0052] like Figure 4As shown, the brake housing 41 is further provided with a guide cavity 412, the deformation cavity 411 and the guide cavity 412 are sequentially connected and coaxially arranged along the axial direction of the motor shaft 3, the cross-sectional dimension of the deformation cavity 411 is larger than the cross-sectional dimension of the guide cavity 412, the shape of the guide cavity 412 matches the shape of the friction body 4221, and the friction body 4221 partially extends into the guide cavity 412. The guide cavity 412 and the deformation cavity 411 in this embodiment are sequentially arranged along the front-rear direction, and the guide cavity 412 can cooperate with the brake shaft 421 to guide and prevent the brake structure 42 from shifting, thereby ensuring the stability of the brake module 4.

[0053] The present invention also proposes an engineering machine, which includes a wire body and the above wheel-side drive system 100, and the specific structure of the wheel-side drive system 100 refers to the above embodiment. Since the engineering machine adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. In one embodiment, the engineering vehicle can be applied to an aerial work platform.

[0054] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0055] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0057] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A wheel side drive system, characterized in that: The wheel side drive system (100) comprises: A control module, comprising a control housing (1) and a controller accommodated in the control housing (1); A motor module, comprising a motor housing (2) and a motor structure accommodated in the motor housing (2); A brake module (4), comprising a brake housing (41) and a brake structure (42) accommodated in the brake housing (41); A deceleration module, comprising a deceleration housing (5) and a deceleration structure accommodated in the deceleration housing (5), wherein the braking structure (42) and the deceleration structure are both connected to the motor shaft (3) of the motor structure; The control housing (1) and the brake housing (41) are both integrated and installed outside the motor housing (2); the brake structure (42) and the controller are electrically connected via a brake signal line (6); the brake housing (41) and the control housing (1) are both provided with a wire through hole for the signal line to pass through; the brake signal line (6) is located outside the control housing (1) and the brake housing (41); the motor structure and the controller are electrically connected via a terminal block; two ends of the terminal block extend into the motor housing (2) and the control housing (1), respectively.

2. The wheel side drive system according to claim 1, characterized in that: The control housing (1), the motor housing (2), the brake housing (41) and the reduction housing (5) are abutted and connected in sequence along the axial direction of the motor shaft (3); the motor shaft (3) passes through the brake housing (41) and is connected to the reduction structure.

3. The wheel side drive system according to claim 2, characterized in that: The brake housing (41) comprises: A shell body (413) accommodating the braking structure (42); The mounting outer edge (415) is arranged around the outer edge of the shell body (413) on the side away from the motor module. The mounting outer edge (415) and the shell body (413) form an assembly space for the installation tool to extend into. The mounting outer edge (415) is provided with a connection hole (416) connected to the reduction shell (5).

4. The wheel side drive system according to claim 3, characterized in that: A weight reduction cavity (417) is provided on one side of the mounting outer edge (415) facing the deceleration module; and / or, There are a plurality of connection holes (416), and the plurality of connection holes (416) are arranged at intervals along the circumference of the mounting outer edge (415).

5. The wheel side drive system according to any one of claims 1 to 4, characterized in that: The braking structure (42) comprises: A brake shaft (421), wherein the motor shaft (3) and the brake shaft (421) are connected via a spline; The friction plate (422) comprises a friction body (4221) and a friction outer ring (4222) connected to the outer edge of the friction body (4221), wherein the friction body (4221) is sleeved outside the brake shaft (421); The brake disc (423) is in contact between the friction outer ring (4222) and the brake shell (41) along the axial direction of the motor shaft (3), and the brake disc (423) is sleeved outside the friction body (4221).

6. The wheel side drive system according to claim 5, characterized in that: The brake housing (41) is provided with a deformation cavity (411), the brake disc (423) and the friction outer ring (4222) are both accommodated in the deformation cavity (411), the cross-sectional dimension of the brake disc (423) is larger than the cross-sectional dimension of the friction outer ring (4222), and a deformation gap is provided between the cavity wall of the deformation cavity (411) and the brake disc (423).

7. The wheel side drive system according to claim 6, characterized in that: The deformation cavity (411) is provided with an opening on a side facing the motor module, and the brake module (4) further comprises an end cover (418) which is sealed at the opening and abuts against the friction outer ring (4222) to limit the position.

8. The wheel side drive system according to claim 7, characterized in that: The end cover (418) is provided with an escape hole (419) for escaping the motor shaft (3); the cross-sectional dimension of the escape hole (419) is larger than the cross-sectional dimension of the brake shaft (421) and smaller than the cross-sectional dimension of the friction outer ring (4222).

9. The wheel side drive system according to claim 6, characterized in that: The brake housing (41) is further provided with a guide cavity (412); the deformation cavity (411) and the guide cavity (412) are sequentially connected and coaxially arranged along the axial direction of the motor shaft (3); the cross-sectional dimension of the deformation cavity (411) is larger than the cross-sectional dimension of the guide cavity (412); the shape of the guide cavity (412) matches the shape of the friction body (4221), and the friction body (4221) partially extends into the guide cavity (412).

10. An engineering machine, characterized in that: The engineering machinery comprises the wheel-side drive system (100) according to any one of claims 1 to 9.

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