CN212529192U - Casing of semi-coaxial electric drive bridge assembly - Google Patents

Abstract

The utility model discloses a casing of half coaxial-type electricity drive axle assembly, the left shell end wall of this casing have the lower wall portion that corresponds the lower chamber and the last wall portion that corresponds the epicoele. The lower wall portion protrudes rightward relative to the upper wall portion such that the lower wall portion forms a stopper wall at a boundary line with the upper wall portion. Or the lower wall part is flush with the upper wall part or protrudes leftwards relative to the upper wall part, a baffle is arranged on the boundary line of the upper wall part and the lower wall part, a partition plate is arranged on the right side of the lower wall part, and the partition plate closes the cavity opening of the lower cavity. The lower cavity volume of the left shell is very small or even zero, so that the lubricating performance of the electric drive axle assembly can be improved, moreover, the semi-annular wall of the left shell for supporting the left bearing of the differential can be supported by the lower wall part protruding towards the right or the partition plate, so that the strength is higher, and in addition, the oil stirring loss of the left shell is small.

Description

Casing of semi-coaxial electric drive bridge assembly

Technical Field

The utility model relates to an electric vehicle technical field especially relates to a half coaxial-type electricity drives casing of bridge assembly.

Background

The size and the structure of an electric drive axle assembly of the electric vehicle directly influence the whole vehicle arrangement of the electric vehicle, and further influence the whole vehicle performance of the electric vehicle. In order to improve the overall performance of the electric vehicle, a semi-coaxial electric drive axle assembly is developed. A motor shaft of the semi-coaxial electric drive bridge assembly is coaxially arranged with a left half shaft and a right half shaft (namely output shafts), and a main speed reducing shaft (namely an intermediate shaft) is parallelly arranged with the left half shaft and the right half shaft in an offset manner.

The shell of the semi-coaxial electric drive bridge assembly comprises a motor cover, a motor shell, a left shell and a right shell which are sequentially arranged from left to right. The motor is arranged in a cavity enclosed by the motor shell and the motor cover, the main speed reducing part and the differential are arranged in the cavity enclosed by the left shell and the right shell, and the main speed reducing part is positioned above the differential.

In the prior art, a peripheral wall is arranged on the periphery of an end wall of a left shell, the peripheral wall and the end wall enclose a groove cavity with a notch facing right, a baffle plate and a semi-annular wall are arranged in the groove cavity, the baffle plate and the semi-annular wall divide the groove cavity into an upper cavity and a lower cavity together, a cavity opening of the upper cavity faces a main speed reducing part, and a cavity opening of the lower cavity faces a differential mechanism. The semi-annular wall is used for supporting the differential left bearing. The end wall corresponds to a lower region of the lower chamber and the end wall corresponds to an upper region of the upper chamber, both of which are substantially in a vertical plane (i.e., aligned above and below) or the lower region is located to the left directly below the upper region. The semi-annular wall is positioned on the right side of the end wall and is of a cantilever structure extending rightwards relative to the end wall, and a large-size reinforcing rib is arranged on the periphery of the semi-annular wall.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: the lubricating performance of the semi-coaxial electric drive bridge assembly is improved.

In order to solve the technical problem, the utility model provides a casing of semi-coaxial-type electric drive axle assembly, the casing includes the left shell, the left shell is including establishing at the end wall of left end, enclose in the perisporium of end wall periphery and opening semiannular wall up, semiannular wall with the end wall links to each other for support differential left bearing, the end wall with the perisporium encloses the cell cavity that the synthetic notch faces right, be equipped with the retaining wall in the cell cavity, the retaining wall with semiannular wall together with divide the cell cavity into upper chamber and lower chamber, the upper chamber corresponds the upper wall portion of end wall, the lower chamber corresponds the lower wall portion of end wall; the lower wall part protrudes rightwards relative to the upper wall part, so that the lower wall part forms the blocking wall on a boundary line of the lower wall part and the upper wall part; or, lower wall portion with upper wall portion parallel and level or relative upper wall portion is protruding left upper wall portion with set up the baffle on the lower wall portion boundary line, the baffle forms the retaining wall, the right side of lower wall portion sets up the baffle, the baffle seals the accent of cavity down.

Analysis shows that in practical use, the lower cavity is an ineffective lubrication area, and the lubricating performance of the electric drive axle assembly can be improved by reducing the volume of the lower cavity or completely eliminating the lower cavity. The lower wall part protrudes rightwards relative to the upper wall part, or the right side of the lower wall part is provided with the partition plate, and the cavity opening of the lower cavity is sealed by the partition plate.

In addition, the solution in which the lower wall portion is convex rightward with respect to the upper wall portion has the following effects: the lower wall part can form a blocking wall on a boundary line with the upper wall part, namely, the blocking wall is directly formed by the lower wall part, so that other structures are not required to be additionally arranged to form the blocking wall, and the structure of the shell is simplified; in addition, the lower wall part protruding rightwards can be used for supporting the semi-annular wall, so that the lower wall part is supported at the periphery of the semi-annular wall, when the strength requirement is low, reinforcing ribs do not need to be arranged at the periphery of the semi-annular wall, and even if the reinforcing ribs are arranged with high strength requirement, the size of the reinforcing ribs is much smaller than that of the reinforcing ribs with large sizes in the conventional scheme, so that the material can be saved, and the oil stirring loss caused by the reinforcing ribs can be reduced.

Further, the lower wall portion projecting rightward is supported on the outer periphery of the semi-annular wall; alternatively, the baffle is supported about the periphery of the semi-annular wall.

Furthermore, the blocking wall comprises a front blocking wall positioned in front of the semi-annular wall and a rear blocking wall positioned behind the semi-annular wall, the front blocking wall and the rear blocking wall extend in the vertical direction, the upper ends of the front blocking wall and the rear blocking wall are connected with the peripheral wall, and the lower ends of the front blocking wall and the rear blocking wall are connected with the semi-annular wall; the upper end of the front retaining wall is inclined forward relative to the lower end, and/or the upper end of the rear retaining wall is inclined rearward relative to the lower end.

Further, the left shell further comprises a reinforcing rib, the left side of the reinforcing rib is connected with the lower wall portion, one end of the reinforcing rib is connected with the peripheral wall, and the other end of the reinforcing rib is connected with the semi-annular wall; the baffle is arranged on the right side of the reinforcing rib.

Further, the semi-annular wall is integrally formed with the end wall; or the semi-annular wall and the end wall are formed in a split mode and are fixedly connected to the end wall through threaded fasteners.

Further, the left shell further comprises a first annular wall connected to the end wall, the first annular wall is used for supporting the right bearing of the motor, and the first annular wall is coaxial with the semi-annular wall.

Further, the left housing also includes a second annular wall connected to the end wall for supporting a main reduction shaft left bearing.

Further, the second annular wall is located above the first annular wall, the axis of the second annular wall being parallel to the axis of the first annular wall.

Further, the casing still includes and is located the right shell on left shell right side, the right shell with the left shell links firmly together through threaded fastener.

Further, the shell also comprises a motor shell positioned on the left side of the left shell and a motor cover positioned on the left side of the motor shell; the motor cover, the motor shell and the left shell are formed in a split mode and are fixedly connected together through threaded fasteners; or the motor shell and the left shell are integrally formed, and the motor cover and the motor shell are formed in a split mode and are fixedly connected together through a threaded fastener; or the motor cover and the motor shell are integrally formed, and the left shell and the motor shell are formed in a split mode and are fixedly connected together through threaded fasteners.

Drawings

FIG. 1 is a schematic view of an embodiment of a housing of a semi-coaxial electric drive axle assembly according to the present invention assembled with other components;

FIG. 2 is a schematic view of a portion of another embodiment of a housing of a semi-coaxial electric drive axle assembly according to the present invention;

FIG. 3 is a perspective view of FIG. 2;

FIG. 4 is a schematic view of another embodiment of a housing of a semi-coaxial electric drive axle assembly according to the present invention assembled with other components;

the reference numerals are explained below:

1 casing, 11 motor cover, 12 motor casing, 13 left casing, 1311 upper wall, 1312 lower wall, 132 peripheral wall, 133 semi-annular wall, 134 first annular wall, 135 second annular wall, 136 front blocking wall, 137 rear blocking wall, 138 reinforcing rib, 14 right casing;

2 differential, 21 left side gear, 22 right side gear, 23 first planetary gear, 24 second planetary gear, 25 differential left bearing, 26 differential right bearing, 27 differential case;

3, a left half shaft;

4, a right half shaft;

5 motor, 51 rotor, 52 motor shaft, 53 motor right bearing, 54 motor left bearing, 55 left oil seal and 56 right oil seal;

6 main reducing part, 61 main reducing shaft, 62 primary driving gear, 63 primary driven gear, 64 secondary driving gear, 65 secondary driven gear, 66 main reducing shaft left bearing, 67 main reducing shaft right bearing;

7 bearing caps;

8 a partition plate.

Detailed Description

In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be described in further detail with reference to the accompanying drawings and the detailed description.

It should be noted that, in the description of the present invention, all the directions such as "up", "down", "left", "right", "front", "back" and the like are based on the directions of the drawing signs, and are only for convenience of description of the present invention and simplifying the description, rather than indicating or implying that the semi-coaxial electric drive axle assembly provided by the present invention must be arranged in the directions of the signs.

As shown in fig. 1, the housing 1 of the semi-coaxial electric drive axle assembly includes a motor cover 11, a motor casing 12, a left casing 13 and a right casing 14, which are connected in sequence from left to right. The left and right housings 13 and 14 are formed separately and secured together by threaded fasteners.

At least two of the motor cover 11, the motor shell 12 and the left shell 13 are formed in a split mode, and the formed parts in the split mode are fixedly connected together through threaded fasteners. Specifically, the motor cover 11, the motor casing 12 and the left casing 13 can be formed separately (this structure is shown in fig. 1); alternatively, the motor cover 11 and the motor casing 12 may be integrally formed, and the left casing 13 and the motor casing 12 may be separately formed; alternatively, the motor case 12 may be integrally formed with the left case 13, and the motor cover 11 may be formed separately from the motor case 12 (this structure is shown in fig. 2 and 3).

The motor 5 is installed in a cavity enclosed by the motor cover 11 and the motor casing 12, and the differential 2 and the main speed reducing part 6 are installed in a cavity enclosed by the left casing 13 and the right casing 14. The left and right ends of the differential 2 are connected to a left half shaft 3 and a right half shaft 4, respectively.

The differential 2 includes a differential case 27, and a left side gear 21, a right side gear 22, a pinion shaft, a first pinion 23 fitted to the pinion shaft and engaged with the left side gear 21 and the right side gear 22, and a second pinion 24 fitted to the pinion shaft and engaged with the left side gear 21 and the right side gear 22, which are provided in the differential case 27. The left side gear 21 and the right side gear 22 are each formed with a spline hole. The right end of the left half shaft 3 is provided with a spline, and the end extends into the splined hole of the left half shaft gear 21 and is connected with the left half shaft gear 21 through the spline. The left end of the right half shaft 4 is provided with a spline, and the end extends into a spline hole of the right half shaft gear 22 and is connected with the right half shaft gear 22 through the spline. A differential left bearing 25 is provided at the left end of the differential case 27, and a differential right bearing 26 is provided at the right end of the differential case 27.

The electric machine 5 is arranged on the left side of the differential 2. The motor 5 comprises a motor shaft 52, a rotor 51 fixedly connected to the motor shaft 52 through a flat key or other key connection modes, and a left oil seal 55 and a right oil seal 56 which are arranged at the left end and the right end of the motor shaft 52. The motor shaft 52 is a hollow shaft, the motor shaft 52 is sleeved on the left half shaft 3, and the motor shaft 52 is coaxial with the left half shaft 3 and the right half shaft 4. The left and right ends of the motor shaft 52 are respectively sleeved with a motor left bearing 54 and a motor right bearing 53.

The main reduction unit 6 includes a main reduction shaft 61, a primary driven gear 63 attached to the main reduction shaft 61, a primary drive gear 62 meshing with the primary driven gear 63, a secondary drive gear 64 integrally formed with the main reduction shaft 61, and a secondary driven gear 65 meshing with the secondary drive gear 64. The first-stage driving gear 62 is integrally formed with the right end of the motor shaft 52 or fixedly connected through a spline hole, and the first-stage driving gear 62 is located on the right side of the motor right bearing 53. The secondary driven gear 65 is connected to the outer periphery of the differential case 27 of the differential 2. The final drive section 6 is disposed above the differential 2, the final drive shaft 61 is parallel to the left and right axle shafts 3 and 4, and a final drive shaft left bearing 66 and a final drive shaft right bearing 67 are mounted on both left and right ends of the final drive shaft 61, respectively.

The transmission process of the electric drive axle assembly is as follows:

the rotor 51 and the motor shaft 52 of the motor 5 rotate to drive the first-stage driving gear 62 to rotate, drive the first-stage driven gear 63 to rotate, drive the main speed reduction shaft 61 and the second-stage driving gear 64 to rotate, drive the second-stage driven gear 65 to rotate, drive the differential case 27 to rotate, drive the first planetary gears 23 and the second planetary gears 24 to revolve, drive the left axle shaft gear 21 and the right axle shaft gear 22 to rotate, drive the left axle shaft 3 and the left axle shaft 4 to rotate, and drive the left wheel and the right wheel to rotate. When the vehicle travels straight, the first planetary gear 23 and the second planetary gear 24 revolve, making the rotation speeds of the left wheel and the right wheel the same. When the vehicle turns, the first planetary gear 23 and the second planetary gear 24 revolve around and rotate around the planetary gear shafts, so that the rotating speeds of the left wheel and the right wheel are different, and the vehicle is ensured to turn smoothly.

Specifically, the right housing 14 is provided with a mounting hole for mounting the right main reduction shaft bearing 67 and a mounting hole for mounting the right differential bearing 26, and the motor cover 11 is provided with a mounting hole for mounting the left motor bearing 54. The left housing 13 is provided with a mounting hole for mounting the main speed reduction shaft left bearing 66, a mounting hole for mounting the differential left bearing 25 and a mounting hole for mounting the motor right bearing 53.

As shown in connection with fig. 2 and 3, the left housing 13 includes an end wall, a semi-annular wall 133, a first annular wall 134, and a second annular wall 135.

The semi-annular wall 133 is connected with the end wall, the opening of the semi-annular wall 133 faces upwards, the opening of the semi-annular wall 133 is connected with the bearing cover 7 through a bolt fastener, and the bearing cover 7 and the semi-annular wall 133 jointly enclose a mounting hole for mounting the differential left bearing 25. In the mounted state, the differential left bearing 25 is supported on the semi-annular wall 133. The semi-annular wall 133 may be integrally formed with the end wall or may be formed separately and attached to the end wall by threaded fasteners (shown as an integrally formed structure).

Attached to the end wall is a first annular wall 134, the first annular wall 134 enclosing a mounting hole for mounting the motor right bearing 53. The first annular wall 134 is coaxial with the semi-annular wall 133, and the semi-annular wall 133 is located to the right of the first annular wall 134 and is connected to the first annular wall 134.

A second annular wall 135 is attached to the end wall, the second annular wall 135 enclosing a mounting hole for mounting the main reduction shaft left bearing 66. The second annular wall 135 is located above the first annular wall 134, and the axis of the second annular wall 135 and the axis of the first annular wall 134 are parallel to each other.

As shown in fig. 3, the left shell 13 further includes a peripheral wall 132, the peripheral wall 132 is disposed around the periphery of the end wall, the peripheral wall 132 and the end wall jointly enclose a slot cavity with a notch facing to the right, and a blocking wall is disposed in the slot cavity.

The blocking walls specifically include a front blocking wall 136 located on the front side of the semi-annular wall 133 and a rear blocking wall 137 located on the rear side of the semi-annular wall 133, the front blocking wall 136 and the rear blocking wall 137 both extend in the up-down direction, the left sides of the front blocking wall 136 and the rear blocking wall 137 are both connected to the end walls (including the upper wall portion 1311 and the lower wall portion 1312), the upper ends of the front blocking wall and the rear blocking wall are both connected to the peripheral wall 132, and the lower ends of the front blocking wall and the rear blocking wall are both connected.

The upper end of the front blocking wall 136 is inclined forward relative to the lower end, and/or the upper end of the rear blocking wall 137 is inclined rearward relative to the lower end. So set up, lubricating oil can keep off wall 136 and the back and keep off wall 137 downstream along the front to in gathering the semi-annular wall 133, in order to be favorable to lubricating oil to gather together and concentrate, realize that less fuel charge can reach better lubricated effect, that is to say, front wall 136 and back wall 137 can play the water conservancy diversion effect.

In specific implementation, in order to improve the flow conductivity of the front retaining wall 136 and the rear retaining wall 137, the front retaining wall 136 and the rear retaining wall 137 may be smoothly curved, and the upper ends of the front retaining wall 136 and the rear retaining wall 137 may be tangent to the peripheral wall 132, and the lower ends of the front retaining wall 136 and the rear retaining wall 137 may be tangent to the semi-annular wall 133.

Together, the dam wall and semi-annular wall 133 divide the slot cavity into upper and lower chambers, as shown in fig. 3. For convenience of description, the end wall region corresponding to the lower cavity will be referred to as a lower wall portion 1312, and the end wall region corresponding to the upper cavity will be referred to as an upper wall portion 1311.

Analysis shows that in actual use, key parts such as gears, bearings and the like are all intensively arranged in the area facing the cavity opening of the upper cavity, so that the upper cavity is the area which is really effective for oil lubrication. And the area towards which the lower cavity mouth faces is not critical to arrangement, so the lower cavity is an ineffective lubrication area. The lower cavity forms an oil separation area, during operation, oil easily flows into but is difficult to flow out of the lower cavity, so that the situation that the quantity of lubricating oil is insufficient appears at the part needing lubricating, and more lubricating oil needs to be added in order to meet the requirement of the quantity of lubricating oil at the part needing lubricating, so that the operation cost is high. Thus, reducing the volume of the lower chamber or eliminating the lower chamber altogether can improve the lubrication performance of the electric drive axle assembly.

Specifically, as shown in fig. 1 to 3, the lower wall 1312 is formed to be convex rightward with respect to the upper wall 1311, so that the volume of the lower chamber can be reduced. When the lower wall portion 1312 is sufficiently protruded rightward, the lower chamber can be completely eliminated.

By adopting the mode, the volume of the lower cavity can be reduced, and the effect of improving the lubricating performance is achieved;

moreover, the blocking wall can be formed on the boundary line between the lower wall portion 1312 and the upper wall portion 1311, that is, the blocking wall is directly formed by the lower wall portion 1312, so that the blocking wall is formed without additionally providing other structures, thereby simplifying the casing structure;

furthermore, the lower wall 1312 protruding rightward can support the semi-annular wall 133, and the lower wall 1312 can be supported on the periphery of the semi-annular wall 133, so that when the strength requirement is low, reinforcing ribs do not need to be arranged on the periphery of the semi-annular wall 133, and even when the reinforcing ribs are arranged with high strength requirement, the size of the reinforcing ribs is much smaller than that of the reinforcing ribs with large sizes in the conventional scheme, so that materials can be saved, and the oil stirring loss caused by the reinforcing ribs can be reduced. In addition, for the purpose of increasing the strength, a rib may be provided between the left side of the lower end wall and the semi-annular wall (i.e., the area indicated by the arrow in fig. 2), and the rib may be provided in this area without causing a loss of oil stirring.

Specifically, the left shell can be modified on the basis of the conventional left shell, so that the volume of the lower cavity of the conventional left shell is reduced and even completely eliminated. As shown in fig. 3, lower wall 1312 of the conventional left shell is located at a position slightly to the left directly below upper wall 1311 or directly below upper wall 1311 (i.e., flush with upper wall 1311), and the conventional left shell is provided with a baffle in the cavity to form a baffle wall, and large-sized ribs are provided on the outer periphery of semi-annular wall 133 to support semi-annular wall 133.

In fig. 4, the partition plate 8 is provided on the right side of the lower wall 1312, and the partition plate 8 closes the opening of the lower chamber, so that the oil cannot enter the lower chamber, which is equivalent to reducing the volume of the lower chamber, thereby achieving the effect of improving the lubricating performance. Specifically, the partition plate 8 may be provided on the outer periphery of the semi-annular wall 133, and the semi-annular wall 133 may be supported by the partition plate 8, which may further enhance the structural strength of the semi-annular wall 133. The large-sized rib is located between the partition plate 8 and the lower wall portion 1312 and is covered by the partition plate 8, thereby avoiding oil churning loss caused by the large-sized rib.

It is right above the utility model provides a casing of semi-coaxial formula electricity drive bridge assembly has carried out the detailed introduction. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims (10)

1. Housing for a semi-coaxial electric drive axle assembly, said housing (1) comprising a left housing (13), said left housing (13) comprising an end wall at a left end, a peripheral wall (132) surrounding said end wall, and a semi-annular wall (133) opening upwards, said semi-annular wall (133) being connected to said peripheral wall (132) for supporting a differential left bearing (25), said end wall and said peripheral wall (132) enclosing a cavity with a slot opening to the right, a wall being arranged in said cavity, said wall dividing said cavity with said semi-annular wall (133) into an upper cavity corresponding to an upper wall portion (1311) of said end wall and a lower cavity corresponding to a lower wall portion (1312) of said end wall,

the lower wall part (1312) protrudes rightward relative to the upper wall part (1311) so that the lower wall part (1312) forms the blocking wall on a boundary line with the upper wall part (1311);

or the lower wall part (1312) is flush with the upper wall part (1311) or protrudes leftwards relative to the upper wall part (1311), a baffle is arranged on the boundary line of the upper wall part (1311) and the lower wall part (1312) and forms the blocking wall, a partition plate (8) is arranged on the right side of the lower wall part (1312), and the partition plate (8) closes the cavity opening of the lower cavity.

2. Housing of a semi-coaxial electric drive axle assembly according to claim 1, characterized in that the lower wall portion (1312) projecting to the right is supported at the periphery of the semi-annular wall; alternatively, the baffle (8) is supported peripherally to the semi-annular wall.

3. Housing of a semi-coaxial electric drive bridge assembly according to claim 1, wherein the blocking walls comprise a front blocking wall (136) located in front of the semi-annular wall (133) and a rear blocking wall (137) located behind the semi-annular wall (133), the front blocking wall (136) and the rear blocking wall (137) each extending in an up-down direction, and having an upper end connected to the peripheral wall (132) and a lower end connected to the semi-annular wall (133); the upper end of the front blocking wall (136) is inclined forward relative to the lower end, and/or the upper end of the rear blocking wall (137) is inclined rearward relative to the lower end.

4. The housing of a semi-coaxial electric drive axle assembly according to claim 1, characterized in that the left shell (13) further comprises a stiffener (138), the left side of the stiffener (138) being connected to the lower wall portion (1312), one end of the stiffener (138) being connected to the peripheral wall (132) and the other end being connected to the semi-annular wall (133); the baffle plate (8) is arranged on the right side of the reinforcing rib (138).

5. Housing of a semi-coaxial electric drive bridge assembly according to claim 1, characterized in that the semi-annular wall (133) is integrally formed with the end wall; alternatively, the semi-annular wall (133) is formed separately from the end wall and is secured to the end wall by threaded fasteners.

6. Housing of a semi-coaxial electric drive bridge assembly according to one of the claims 1 to 5, characterized in that the left shell (13) further comprises a first annular wall (134), the first annular wall (134) being connected to the end wall, the first annular wall (134) being adapted to support an electric machine right bearing (53), the first annular wall (134) being coaxial with the semi-annular wall (133).

7. Housing of a semi-coaxial electric drive bridge assembly according to claim 6, characterized in that the left housing (13) further comprises a second annular wall (135), the second annular wall (135) being connected to the end wall, the second annular wall (135) being adapted to support a main reduction shaft left bearing (66).

8. Housing of a semi-coaxial electric drive bridge assembly according to claim 7, characterized in that the second annular wall (135) is located above the first annular wall (134), the axis of the second annular wall (135) being parallel to the axis of the first annular wall (134).

9. Housing of a semi-coaxial electric drive axle assembly according to any of the claims 1-5, characterized in that the housing (1) further comprises a right housing (14) on the right side of the left housing (13), the right housing (14) being fastened to the left housing (13) by means of threaded fasteners.

10. Housing of a semi-coaxial electric drive bridge assembly according to claim 9, characterized in that the housing (1) further comprises a motor housing (12) located on the left side of the left housing (13), a motor cover (11) located on the left side of the motor housing (12); the motor cover (11), the motor shell (12) and the left shell (13) are formed in a split mode and are fixedly connected together through threaded fasteners; or the motor shell (12) and the left shell (13) are integrally formed, and the motor cover (11) and the motor shell (12) are formed in a split mode and are fixedly connected together through a threaded fastener; or the motor cover (11) and the motor shell (12) are integrally formed, and the left shell (13) and the motor shell (12) are separately formed and are fixedly connected together through a threaded fastener.

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