CN216981687U - Motor for forklift integrated power assembly and integrated power assembly - Google Patents

Abstract

The utility model provides a motor for a forklift integrated power assembly, which comprises a machine shell and water channels arranged along the circumferential direction of a stator and rotor mounting part in the machine shell, wherein the water channels comprise at least two circulation water channel groups oppositely arranged along the stator and rotor mounting part, and the motor also comprises an end cover arranged at the end part of the machine shell and used for realizing the snake-shaped circulation of cooling liquid along one circulation water channel group and guiding the cooling liquid to the next circulation water channel group. The utility model also provides an integrated power assembly. The end cover can realize the snake-shaped circulation of the cooling liquid along the same circulation water channel group, can also be used for realizing the conduction of the cooling liquid between the adjacent circulation water channel groups, and has the advantages of less components, low design and manufacturing cost and low requirement on the sealing performance of the motor; in addition, the play basin that the end cover lateral wall set up, intercommunication groove, intake chamber and storage tank can increase the volume of adjacent water course junction to make things convenient for the quick circulation of coolant liquid, the coolant liquid passes through efficiently, and the radiating effect is good.

Description

Motor for forklift integrated power assembly and integrated power assembly

Technical Field

The utility model relates to the technical field of forklift power, in particular to a motor for a forklift integrated power assembly and the integrated power assembly.

Background

Among the prior art, electric fork-lift realizes the walking function of self through the walking driving motor, realizes the take-off and landing of portal through oil pump motor, arranges with regard to present electric fork-lift car whole car, mostly walking driving motor and oil pump motor separately arrange, so causes the integrated level of whole fork-lift's power assembly to hang down, and space utilization is not high. Simultaneously because above-mentioned walking driving motor and oil pump motor will last work at fork truck operation in-process, lead to two motors can produce more heat, if do not discharge above-mentioned heat in time, can cause adverse effect to fork truck power assembly.

Based on this, patent application No. 202011600944.4, application publication No. CN112590552A, and application date of 29/12/2020 discloses an electric forklift based on high-voltage technology, which includes a traveling motor and an oil pump motor, and further includes: the high-voltage system is respectively connected with the walking motor and the oil pump motor and is used for supplying high voltage to the walking motor and the oil pump motor; and a water cooling loop of the water cooling system dissipates heat of the high-voltage system, the walking motor and the oil pump motor through the high-voltage system, the walking motor and the oil pump motor. This application introduces electric fork lift with high voltage system, for electric fork lift provides more electric quantity, littleer electric current, improves electric fork lift's duration, reduces electric fork lift's electric elements's calorific capacity, is favorable to prolonging electric elements's life-span, promotes whole car performance. The water-cooling heat dissipation system is introduced into the electric forklift to improve the heat dissipation effect, so that the walking motor and the oil pump motor have better heat dissipation effect, and the performance specifications of working parts such as the walking motor and the oil pump motor are improved, and the working performance of the whole electric forklift is improved, but the mode of performing water-cooling heat dissipation on the distributed walking motor and the oil pump motor by the technical scheme disclosed above further reduces the integration degree of a power assembly of the forklift and ensures that the space utilization rate of the whole forklift is not high, so that the patent application number is 201810479394.1, the application publication number is CN110504792A, the application date is 2018, 5 and 18, the name of the patent is a self-cooling oil pump motor and a realization method thereof, and the self-cooling oil pump motor is disclosed and comprises a motor shell, a motor rotor and a motor stator; the self-cooling device is arranged on the outer side of the motor stator; the self-cooling device includes: the cooling oil cavity is arranged between the heat dissipation outer wall and the heat conduction inner wall tightly attached to the outer wall of the motor stator; the oil cavity oil inlet is arranged at one end of the cooling oil cavity; the oil cavity oil outlet is arranged at the other end of the cooling oil cavity; when the oil pump motor drives the hydraulic pump to work, hydraulic oil which circularly flows in the hydraulic system is guided into the cooling oil cavity through the oil cavity oil inlet and then guided out through the oil cavity oil outlet, heat dissipated by the motor stator is taken away, and self-cooling of the oil pump motor is achieved. The utility model improves the heat dissipation effect of long-time operation, eliminates wind friction loss and improves the motor efficiency. This scheme is through setting up the cooling oil pocket in that the oil pump motor is inside, and the laminating of cooling oil pocket and motor stator utilizes hydraulic oil to take away the heat that the oil pump motor during operation produced along the flow of cooling oil pocket, and the above-mentioned scheme that sets up cooling body in that the oil pump motor is inside can improve fork truck driving system's integrated level, improve fork truck's space utilization to a certain extent.

Based on this, the technical scheme that a cooling water channel is arranged inside a motor shell to radiate the motor is created in the prior art, because the existing walking motor and the oil pump motor are two motors with different structures and appearances, when the cooling water channel is arranged inside the motor, the structure and the arrangement position of the cooling water channel are different, specifically, the cooling water channel on the oil pump motor is arranged along the axial direction of the shell, and the cooling water channel of the walking motor is spirally arranged on the shell, two motor dies need to be arranged on the motors with the two different structures, the design scheme of the two different motor dies can cause higher design cost, and the processing needs to be completely separated, the workload of the whole production assembly is larger, and in addition, the subsequent production, maintenance and repair costs of the two dies are higher. Therefore, the prior art has produced the technical scheme that applies the cooling water channel structure of the oil pump motor to the two motors, because the inside water channel of the oil pump motor is a plurality of along the axial setting of the motor casing, in order to realize the circulation between the water channels, need in addition dispose the general accessory of guide on the casing, such as set up the baffle of seting up the via hole at casing both ends face and realize the intercommunication of adjacent water channel, this kind of technical scheme can increase the inside component number of motor, the design, manufacturing cost is higher, and it is higher to require motor sealing performance, in addition, be limited to the thinner size of baffle, lead to that the circulation speed of coolant along between the adjacent water channel is less, the radiating efficiency of coolant is not high.

SUMMERY OF THE UTILITY MODEL

The utility model provides a motor with a plurality of circulation water channel groups arranged in a shell, which is characterized in that the guide function of an end cover is utilized to guide cooling liquid to the next circulation water channel group after the cooling liquid is snakelike and circularly circulated in the first circulation water channel group, so that the cooling liquid is circularly circulated between the adjacent water channel groups, and the purpose of fully utilizing the circulation water channels in the circulation water channel groups is achieved, and the motor is radiated by the circulation of the cooling liquid along the cooling water channels; in addition, the motor can be used as an oil pump motor and a walking motor, so that the design and production work of two motors can be realized by the same set of die.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the utility model provides a motor for integrated power assembly of fork truck, includes the casing and follows the inside water course of deciding rotor installation department circumference setting of casing, the water course includes at least two sets of circulation water courses of deciding the relative setting of rotor installation department along, the motor still includes:

the end cover is arranged at the end part of the shell and used for realizing the serpentine circulation of the cooling liquid along the first flow-to-water channel group and guiding the cooling liquid to the next flow-to-water channel group;

the cooling liquid flows along the first flow water transfer channel group in a snake-shaped mode, then is guided to the next flow water transfer channel group through the end cover, flows in a snake-shaped mode again through the second flow water transfer channel group, and then is discharged through the end cover.

Preferably, circulation water course group includes that at least three run through casing both ends face and follow the circulation water course that stator and rotor installation department circumference set up, the circulation water course is including the transition water course that is used for getting into, outflow and changes the entering water course and outflow water course of water course and be used for the intercommunication to get into the water course and flow out the water course in order to form snakelike circulation water route.

Preferably, in the flow direction of the coolant, a conducting water channel for flowing the coolant between adjacent water channels is arranged between the inlet water channel and the transition water channel and between the transition water channel and the outlet water channel.

Preferably, the conduction water channel is a water channel groove which is arranged on the end face of the shell or the side wall of the end cover and is used for communicating the end parts of the adjacent water channels.

Preferably, when the conducting water channel is arranged on the end face of the machine shell, the end face of the machine shell is provided with a notch for communicating the end part of the connected water channel.

Preferably, when the conducting water channel is arranged on the side wall of the end cover, the side wall of the end cover is provided with a groove corresponding to the end position of the adjacent water channel.

Preferably, when the flow water channel group is four flow water channels which penetrate through two end faces of the machine shell and are arranged along the circumferential direction of the stator and rotor mounting portion, two transition water channels are arranged, and the end portions of the two adjacent transition water channels are communicated through the conduction water channels.

Preferably, the inner side of the end cover comprises a water outlet groove for the cooling liquid to flow out along the first flow water channel group, a communication groove which starts from the water outlet groove, extends along the inner part of the end cover and is used for communicating the adjacent flow water channel groups, and a water inlet groove which is arranged at the tail end of the communication groove and is used for flowing the cooling liquid into the next flow water channel group.

Preferably, the side wall of the end cover is provided with a water inlet and/or a water outlet.

An oil pump motor and a walking motor in the integrated power assembly both adopt the motors.

According to the technical scheme, the utility model has the following beneficial effects:

1. in the utility model, after cooling liquid enters a first flow water channel group of a shell through an inlet water channel, serpentine circulation flow is realized along the inlet water channel, a transition water channel and an outlet water channel in sequence, because the conduction water channels are arranged between the inlet water channel and the transition water channel and between the transition water channel and the outlet water channel, and conduction between adjacent water channels can be realized through the conduction water channels, the water channels in the flow water channel group can be fully utilized in the process of flowing along the flow water channel group, dead channels do not exist, the utilization rate of the water channels is ensured to be 100%, after the cooling liquid flows out along the outlet water channel of the flow water channel group, the cooling liquid enters the end cover through the water outlet channel on the end cover, flows to the water inlet channel through the communication channel and enters a next flow water channel group through the water inlet channel, and then subsequent circulation flow is carried out, the end cover not only can realize serpentine circulation of the cooling liquid along the same flow water channel group, the cooling device can also be used for realizing the conduction of cooling liquid between adjacent circulating water channel groups, and compared with the traditional scheme of additionally arranging a conduction fitting in the motor, the cooling device has the advantages of fewer components, low design and manufacturing cost and low requirement on the sealing performance of the motor; in addition, the play basin that the end cover lateral wall set up, intercommunication groove, intake chamber and storage tank can increase the volume of adjacent water course junction to make things convenient for the quick circulation of coolant liquid, improve the efficiency that the coolant liquid passes through.

2. In the utility model, the motor can be applied to an oil pump motor and a walking motor of a forklift integrated power assembly, and two different water running modes can be realized under the condition of the same structure, namely, after the conduction water channel for communicating adjacent water channels is arranged at the corresponding position of the end surface of the shell or the side wall of the end cover according to actual use requirements, the cooling liquid is guided to a next flow water channel group for subsequent snakelike circulation through the end cover after snakelike circulation flow through the flow water channel group, namely, the arrangement position of the conduction water channel in the utility model is not fixed, and can be correspondingly adjusted according to the positions of a water inlet and a water outlet, so that the water channels in the flow water channel group can be fully utilized Design work has the advantage of saving cost, simultaneously, adopts the design scheme reducible to the mould follow-up maintenance work load of maintaining of a set of mould, is favorable to improving work efficiency.

Drawings

FIG. 1 is a schematic structural diagram of a walking motor and an oil pump motor provided by the utility model;

FIG. 2 is an enlarged view of a portion A of FIG. 1;

FIG. 3 is a schematic view of the other side of FIG. 1;

FIG. 4 is a partial enlarged view of portion B of FIG. 3;

FIG. 5 is a schematic view of the inside structure of the end cap provided by the present invention;

FIG. 6 is a schematic flow diagram of the oil pump motor of FIG. 1 after the internal water passages are embodied;

FIG. 7 is a schematic view of the flow channel assembly of FIG. 6 after being specifically assembled;

FIG. 8 is a schematic view of the alternate flow channel assembly of FIG. 6 after being specifically assembled;

fig. 9 is a schematic structural view after the water channel on the end cover of the oil pump motor is embodied;

FIG. 10 is a schematic flow diagram of the walking motor of FIG. 1 with the internal water channel embodied;

FIG. 11 is a schematic view of the flow channel assembly of FIG. 10 after being specifically assembled;

FIG. 12 is a schematic view of the alternate flow path set of FIG. 10 after being specifically constructed;

FIG. 13 is a schematic structural view of the walking motor after the water supply channel on the end cover is embodied;

FIG. 14 is a schematic view of the outer side structure of the end cap provided by the present invention;

fig. 15 is a schematic structural view of a front end cap provided by the present invention.

In the figure: 10. a housing; 20. a circulation water channel group; 210. entering a water channel; 220. a water flowing out passage; 230. a transition water channel; 240. conducting a water channel; 241. a notch; 30. an end cap; 30', a front end cover; 310. a water outlet groove; 320. a communicating groove; 330. a water inlet tank; 340. a water inlet; 350. a water outlet; 360. a containing groove.

Detailed Description

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

Example (b):

referring to fig. 1, 3 and 5, a motor for a forklift integrated power assembly includes a housing 10 and water channels disposed along a circumference of a stator and rotor mounting portion inside the housing, where the water channels include at least two sets of circulation water channel sets 20 disposed opposite to each other along the stator and rotor mounting portion, and in this embodiment, the circulation water channel sets 20 are two sets, the motor further includes an end cap 30 disposed at an end of the housing for realizing serpentine circulation of a cooling liquid along one of the circulation water channel sets and guiding the cooling liquid to a next circulation water channel set, so that, in an actual use process, the cooling liquid flows down to the next circulation water channel set under guidance of the end cap after serpentine circulation along one of the circulation water channel sets, and is discharged through the end cap after serpentine circulation again through the next circulation water channel set, and the end cap not only can enable the cooling liquid to circulate serpentine circulation along the same water channel set, but also can realize conduction to adjacent circulation water channel sets, the water channel of the circulation water channel group is fully utilized, so that heat generated in the working process of the motor is absorbed through circulation of the cooling liquid along the circulation water channel group, the direction of the cooling liquid can be continuously changed in the process of circulation of the cooling liquid along the circulation water channel group, and the heat dissipation efficiency can be improved.

It should be noted that the end cover referred to in the present invention refers to a rear end cover of the motor, and correspondingly, in order to form a complete structure of the motor, the end cover further includes a front end cover 30' used in cooperation with the end cover 30, which can be referred to in particular fig. 15.

Referring to fig. 2 and 3, as a preferred technical solution of the present invention, the circulation water channel set 20 includes at least three circulation water channels penetrating two end faces of the casing and disposed along the circumferential direction of the stator/rotor mounting portion, the circulation water channel sets of the present embodiment are set as two sets, each circulation water channel set of each set has four circulation water channels distributed at intervals, specifically, the casing of the present embodiment is formed by stretching through a mold, the stretched casing has the four circulation water channels, and adjacent circulation water channels on the initially stretched casing are separated by a barrier strip and cannot be conducted; further, the circulation water channel includes an inlet water channel 210 and an outlet water channel 220 for inlet and outlet of the circulation water channel, and a transition water channel 230 for communicating the inlet water channel and the outlet water channel, the inlet water channel and the outlet water channel of this embodiment are disposed on two sides of the transition water channel, and the two transition water channels penetrate two end faces of the housing.

Further, in order to facilitate the intuitive display of the arrangement position and the direction of the water channel inside the motor, the water channel inside the motor is embodied as shown in fig. 6, 7, 8, 9, 10, 11, 12 and 13, in order to realize the serpentine circulation of the cooling liquid along the inlet water channel 210, the outlet water channel 220 and the transition water channel 230 in the transition water channel group 20, a conducting water channel 240 for the cooling liquid to flow between the adjacent water channels is arranged between the inlet water channel 210 and the transition water channel 230 and between the transition water channel and the outlet water channel 220, and in addition, when a plurality of transition water channels are arranged, a conducting water channel is also arranged between the two transition water channels along the flow direction of the cooling liquid; specifically, the conducting water channel is a water channel groove, and the conducting water channel can be arranged on the end face of the shell or on the side wall of the end cover; when the conducting water channel 240 is disposed at the end face of the housing, a gap 241 is disposed on the barrier between the adjacent water channels of the tail end of the entering water channel and the head end of the transition water channel along the flowing direction of the cooling liquid, as shown in fig. 4, the gap can realize communication between adjacent water channels, specifically referring to fig. 6, 7 and 8, the cooling liquid enters the casing along the water channel of the C surface, flows to the D surface along the water channel, because the end surface of the machine shell of the D surface is provided with the notch, the cooling liquid can enter the transition water channel through the notch and flow to the C surface along the transition water channel, and the end surface of the machine shell of the C surface is also provided with the notch, the gap can be used for communicating the transition water channel and the outflow water channel, so that the cooling liquid flows into the outflow water channel through the transition water channel, and then flows to the D surface and enters the end cover, and flows to the next flow-to-water channel group under the guiding action of the end cover.

Further, when the conducting water channel 240 is disposed on the side wall of the end cover, the conducting water channel is specifically a groove disposed on the side wall of the end cover and corresponding to the end portion of the adjacent water channel, specifically, referring to the circulating water channel set located below in fig. 6, after the cooling liquid enters the water channel and flows from the D surface to the C surface, the cooling liquid flows into the transition water channel under the communication effect of the notch, flows from the C surface to the D surface through the transition water channel, and enters the end cover groove attached to the D surface, because the groove corresponds to the end portion of the adjacent transition water channel, under the conducting effect of the groove, the cooling liquid enters the next transition water channel, flows from the D surface to the C surface through the next transition water channel, then enters the outflow water channel under the guiding effect of the notch, flows from the C surface to the D surface through the outflow water channel, and finally is discharged through the outflow water channel.

In addition, fig. 10, 11, 12, and 13 are schematic structural diagrams of another embodiment of the water channel inside the motor provided by the present invention, which have the same concept as the foregoing embodiment and are not described herein again.

Therefore, by means of the guiding function of the communicated water channels, all the water channels can be utilized when the cooling liquid flows away, the integral utilization rate of the water channels is guaranteed to be 100%, and no water channel is a dead channel.

As a preferred technical solution of the present invention, referring to fig. 5, 9, and 13 in particular, the inner side of the end cover 30 includes an outlet groove 310 for the cooling liquid to flow out along one of the flow-to-flow channel groups, a communication groove 320 starting from the outlet groove and extending along the inside of the end cover and used for communicating with the adjacent flow-to-flow channel groups, and an inlet groove 330 disposed at the end of the communication groove and used for flowing the cooling liquid into the next flow-to-flow channel group, wherein fig. 9 and 13 are schematic diagrams of the water flow state after the cooling liquid is materialized when flowing along the inside of the end cover, so that the cooling liquid flowing out through the previous flow-to-flow channel group enters the end cover through the outlet groove, and after being conveyed through the communication groove, enters the next flow-to-flow channel group through the inlet groove, thereby achieving the flow of the cooling liquid between the adjacent flow-to-flow channel groups.

Further, when the cooling liquid flows to the inside of the end cover 30 along the water channel, the inner side wall of the end cover can be provided with a containing groove 360, the containing groove can facilitate water flow to pass through, and the efficiency of passing the cooling liquid is improved; in addition, the utility model has advantages in the aspects of motor design, manufacture, installation, maintenance and the like because the end surface of the shell is not required to be provided with a conducting structure similar to a partition plate.

Referring to fig. 14 and 15, as a preferred embodiment of the present invention, a water inlet 340 and/or a water outlet 350 may be disposed on a side wall of the end cover 30, the water inlet may be disposed on an end surface of the end cover, or may be disposed on a side wall of the end cover, the cooling liquid is introduced into an inlet channel of the circulating water channel group through the water inlet 340, and further, the water inlet 340 may be communicated with the accommodating groove, so as to increase the amount of the cooling liquid entering the inside of the end cover. In addition, the water outlet 350 may also be disposed on the end surface or the side wall of the end cover, and is used for receiving the cooling liquid discharged through the water outlet channel in the water flow-to-flow channel set and discharging the cooling liquid out of the motor through the water outlet.

The utility model also provides an integrated power assembly, wherein the oil pump motor and the walking motor in the integrated power assembly are both provided with the motors, so that the design and the die development work of the two motors can be completed through the same die, the development design and maintenance cost is reduced, and particularly, the oil pump motor and the walking motor adopting the motor structures are consistent in structure, but according to the actual installation and use requirements, a water inlet and a water outlet are arranged at corresponding positions of an end cover, and a conducting water channel for connecting adjacent water channels is arranged at the corresponding positions of the inner side wall of the end cover or the end surface of a machine shell according to the positions of the water inlet and the water outlet, so that after cooling liquid flows in a snake shape along a first-flow water channel, the cooling liquid is guided to a next-flow water channel group under the guiding action of the end cover to continue to perform next-flow circulation, as shown in figures 6 and 10, fig. 6 is a schematic structural view of a circulation water channel set of an oil pump motor, fig. 10 is a schematic structural view of a circulation water channel set of a walking motor, and it can be known from fig. 14 and fig. 15 that both are made by using the same mold but have two different water-passing modes, in terms of the oil pump motor, a water inlet and a water outlet are arranged at two opposite end portions of a housing, and after cooling liquid enters through one side end surface of the housing and circularly flows along a plurality of circulation water channel sets, the cooling liquid is discharged through the other side housing end surface, and in terms of the walking motor, the water inlet and the water outlet are both arranged at the side surface of an end cover, so that the cooling liquid enters and exits the motor through one side end surface of the housing, thereby when the circulation water channel sets of the oil pump motor and the walking motor need to be connected to form an integral water channel structure, the inlet and outlet of the cooling liquid of the oil pump motor and the walking motor need to be connected through a connecting pipe, because the water outlet of the oil pump motor and the water inlet of the walking motor are positioned on the same side, the length of the connecting pipeline can be shortened, and the integration level of the forklift integrated power assembly is higher.

Furthermore, it should be noted that the arrangement positions of the oil pump motor and the traveling motor are not limited to the illustrated form, and can be correspondingly adjusted in the spatial position according to actual needs so as to meet the use requirements of the integrated forklift power assembly.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims (10)

1. The utility model provides a motor for integrated power assembly of fork truck, includes casing (10) and along the inside water course of deciding rotor installation department circumference setting of casing, a serial communication port, the water course includes at least two sets of circulation water course groups (20) of deciding the relative setting of rotor installation department along, the motor still includes:

the end cover (30) is arranged at the end part of the shell and is used for realizing the serpentine circulation of the cooling liquid along the first flow-to-water channel group and guiding the cooling liquid to the next flow-to-water channel group;

the cooling liquid flows along the first flow water transfer channel group in a snake-shaped mode, then is guided to the next flow water transfer channel group through the end cover, flows in a snake-shaped mode again through the second flow water transfer channel group, and then is discharged through the end cover.

2. The electric machine according to claim 1, wherein the circulation water passage set (20) includes at least three circulation water passages extending through both end faces of the casing and arranged along a circumferential direction of the stator and rotor mounting portion, the circulation water passages including an inlet water passage (210) and an outlet water passage (220) for inlet and outlet of the circulation water passages, and a transition water passage (230) for communicating the inlet water passage and the outlet water passage to form a serpentine circulation water passage.

3. The machine according to claim 2, wherein, in the direction of flow of the coolant, conducting channels (240) for the coolant to flow between adjacent channels are provided between the inlet channel (210) and the transition channel (230) and between the transition channel and the outflow channel (220).

4. The electric machine of claim 3, wherein the conducting water channel is a water channel groove arranged on the end face of the machine shell or the side wall of the end cover and used for communicating the end parts of the adjacent water channels.

5. The machine according to claim 4, wherein, when the conducting water channel (240) is arranged at the end face of the machine casing, the end face of the machine casing is provided with a notch (241) for communicating with the end of the connecting water channel.

6. The electric machine according to claim 4, characterized in that when the conducting water channel (240) is arranged on an end cover side wall, the end cover side wall is provided with a groove corresponding to the position of the end of the adjacent water channel.

7. The electric machine according to claim 4, wherein when the number of the flow passages is four, the two flow passages are provided, and the flow passages extend through both end surfaces of the housing and are circumferentially provided along the stator/rotor mounting portion, and the end portions of the two adjacent flow passages are communicated with each other through the communication passage.

8. The electric machine according to claim 6, characterized in that the inside of the end cover (30) comprises an outlet channel (310) for the coolant to flow out along a group of flow-through channels, a communication channel (320) starting from the outlet channel and extending along the inside of the end cover and used for communicating adjacent groups of flow-through channels, and an inlet channel (330) arranged at the end of the communication channel and used for the coolant to flow into the next group of flow-through channels.

9. An electric machine according to claim 8, characterized in that the side wall of the end cap (30) is provided with a water inlet (340) and/or a water outlet (350).

10. An integrated power assembly, characterized in that the oil pump motor and the walking motor in the integrated power assembly are both the motors as claimed in any one of claims 1 to 9.

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