阅读说明：本技术 内循环冷却式同轴电机车桥总成 (Internal circulation cooling type coaxial motor axle assembly ) 是由 陈学福 何伟 于 2021-06-12 设计创作，主要内容包括：本发明涉及一种内循环冷却式同轴电机车桥总成,包括车桥壳体、设置在车桥壳体内的差速器、连接在差速器一端的第一输出半轴和连接在车桥壳外部的驱动电机,驱动电机的电机转轴为管状结构且套设在第一输出半轴上,电机转轴的一端伸入车桥壳体内；本发明还包括用于使冷却介质在热交换器和润滑油吸热腔之间循环循环泵、热交换器、套设在第一输出半轴上的润滑油散热腔和套设在润滑油散热腔上的润滑油吸热腔,电机转轴的另一端穿设到润滑油散热腔内且同离心抽气筒对接在一起。本发明具有润滑油在车桥内部进行循环而进行冷却的优点,解决了现有的润滑油引出车桥进行冷却所导致的润滑油流过的路线长会影响油的粘度而影响润滑油的品质的问题。(The invention relates to an internal circulation cooling type coaxial motor axle assembly, which comprises an axle shell, a differential mechanism arranged in the axle shell, a first output half shaft connected to one end of the differential mechanism and a driving motor connected to the outside of the axle shell, wherein a motor rotating shaft of the driving motor is of a tubular structure and is sleeved on the first output half shaft, and one end of the motor rotating shaft extends into the axle shell; the invention also comprises a circulating pump for circulating a cooling medium between the heat exchanger and the lubricating oil heat absorption cavity, the heat exchanger, the lubricating oil heat dissipation cavity sleeved on the first output half shaft and the lubricating oil heat absorption cavity sleeved on the lubricating oil heat dissipation cavity, and the other end of the motor rotating shaft penetrates through the lubricating oil heat dissipation cavity and is butted with the centrifugal pumping cylinder. The invention has the advantage that the lubricating oil circulates in the axle for cooling, and solves the problem that the lubricating oil flowing path is long, which influences the viscosity of the oil and the quality of the lubricating oil, caused by the existing lubricating oil leading out of the axle for cooling.)

1. An internal circulation cooling type coaxial motor axle assembly comprises an axle shell, a differential mechanism arranged in the axle shell, a first output half shaft connected to one end of the differential mechanism, a second output half shaft connected to the other end of the differential mechanism, and a driving motor connected to the outside of the axle shell, wherein a motor rotating shaft of the driving motor is of a tubular structure and is sleeved on the first output half shaft, a transmission mechanism for transmitting the torque of the motor rotating shaft to the differential mechanism is arranged in the axle shell, one end of the motor rotating shaft extends into the axle shell, the internal circulation cooling type coaxial motor axle assembly is characterized by further comprising a circulating pump, a heat exchanger, a lubricating oil heat dissipation cavity sleeved on the first output half shaft, and a lubricating oil heat absorption cavity sleeved on the lubricating oil heat dissipation cavity, wherein the other end of the motor rotating shaft penetrates through the lubricating oil heat dissipation cavity and is butted with an inlet end of a centrifugal air pump, be equipped with in the first output semi-axis along the oil return passageway of first output semi-axis axial extension, the one end of first output semi-axis be equipped with intercommunication oil return passageway with the inlet port of lubricating oil heat dissipation chamber intercommunication, the other end are equipped with the oil outlet of intercommunication oil return passageway and axle casing inner space, constitute the intercommunication for clearance fit between motor shaft and the motor shaft the oil feed passageway of axle casing inner space and centrifugal pump bowl entrance point, lubricating oil heat absorption intracavity is filled with cooling medium, and the part of the wall in lubricating oil heat dissipation chamber keeping apart between lubricating oil heat dissipation chamber and lubricating oil heat absorption chamber is made for the heat conduction material and forms, lubricating oil heat absorption chamber is equipped with lubricating oil heat absorption chamber portion cooling medium import and lubricating oil heat absorption chamber portion cooling medium export, and heat exchanger is equipped with first cooling medium entry of exchanger portion, first cooling medium export of exchanger portion, The lubricating oil heat absorption cavity part cooling medium outlet is connected with the heat exchanger part first medium inlet, and the circulating pump is used for enabling the cooling medium to circulate between the heat exchanger and the lubricating oil heat absorption cavity.

2. The axle assembly of an internally cooled coaxial motor of claim 1 further comprising a motor heat sink chamber disposed about the drive motor and a motor heat sink chamber disposed about the motor heat sink chamber, the motor heat sink being filled with an insulating heat transfer medium, the motor heat sink chamber also being filled with the cooling medium, the motor heat sink chamber having a motor heat sink chamber portion cooling medium inlet and a motor heat sink chamber portion cooling medium outlet, the motor heat sink chamber portion cooling medium inlet also being coupled to the heat exchanger portion first medium outlet, the motor portion cooling medium outlet also being coupled to the heat exchanger portion first medium inlet, and a circulation pump also being adapted to circulate the cooling medium between the heat exchanger and the lubricant heat sink chamber.

3. The internal circulation cooling type coaxial motor axle assembly according to claim 2, further comprising a three-way valve and a middle annular liquid distribution chamber disposed on the motor shaft, wherein at least two of the cooling medium outlets of the lubricating oil heat absorption chamber are disposed on the middle annular liquid distribution chamber, the cooling medium outlets of the lubricating oil heat absorption chamber are distributed along the circumferential direction of the middle annular liquid distribution chamber, the cooling medium outlets of the motor heat absorption chamber are disposed on the middle annular liquid distribution chamber, the middle annular liquid distribution chamber is provided with a plurality of middle annular liquid distribution chamber cooling medium outlets communicated with the motor heat absorption chamber, the three-way valve is provided with a three-way valve portion inlet, a three-way valve portion first outlet and a three-way valve portion second outlet, the cooling medium inlet of the lubricating oil heat absorption chamber is connected with the three-way valve portion first outlet, and the cooling medium inlet of the motor heat absorption chamber is connected with the three-way valve portion second outlet, the three-way valve section inlet is connected to the exchanger section first cooling medium outlet.

4. The axle assembly of an internally-circulated and cooled coaxial motor as recited in claim 3, wherein the intermediate annular air distribution chamber is located at a radially outer end of the lubricating oil heat absorption chamber, the intermediate annular air distribution chamber is provided with a plurality of liquid inlet pipes distributed along a circumferential direction of the intermediate annular air distribution chamber and extending radially, outlets of the liquid inlet pipes are communicated with the intermediate annular air distribution chamber, inlets of the liquid inlet pipes form cooling medium outlets of the lubricating oil heat absorption chamber, and a distance between an inlet of each liquid inlet pipe and an inner circumferential surface of the lubricating oil heat absorption chamber is 5 mm to 10 mm.

5. The axle assembly of an internally-circulating cooling type coaxial motor as recited in claim 2, 3 or 4, wherein an annular liquid-distribution chamber is disposed in the motor oil heat-absorption chamber, the cooling medium outlet of the motor heat-absorption chamber is disposed in the annular liquid-distribution chamber, the annular liquid-distribution chamber is provided with a plurality of annular liquid-distribution chamber cooling medium inlets extending along the circumferential direction of the annular liquid-distribution chamber, the annular liquid-distribution chamber is sleeved on the motor shaft, and the annular liquid-distribution chamber and the cooling medium inlet of the motor oil heat-absorption chamber are circumferentially distributed at two ends of the motor heat-absorption chamber along the motor shaft.

6. The axle assembly of the internal circulation cooling type coaxial motor according to claim 1, 2, 3 or 4, wherein an annular liquid inlet distribution cavity is formed in the lubricating oil heat absorption cavity, a cooling medium inlet of the lubricating oil heat absorption cavity is formed in the annular liquid inlet distribution cavity, a plurality of annular liquid inlet distribution cavity cooling medium outlets extending along the circumferential direction of the annular liquid inlet distribution cavity are formed in the annular liquid inlet distribution cavity, the annular liquid outlet distribution cavity is sleeved on the first output half shaft, and the annular liquid inlet distribution cavity and the cooling medium outlets of the lubricating oil heat absorption cavity are axially distributed at two ends of the lubricating oil heat absorption cavity along the first output half shaft.

7. The axle assembly of the internal circulation cooling type coaxial motor according to claim 1, 2, 3 or 4, wherein a partition plate is arranged in the lubricating oil heat dissipation cavity, the partition plate divides the lubricating oil heat dissipation cavity into a first cavity and a second cavity distributed along the extension direction of a first output half shaft, the centrifugal air pumping cylinder is only positioned in the first cavity, the oil inlet is positioned in the second cavity, the first output half shaft is connected with the partition plate through a partition plate bearing, and a plurality of communication holes distributed along the circumferential direction of the lubricating oil heat dissipation cavity are formed in the radial outer end of the partition plate.

8. The internally cooled, coaxial motor axle assembly of claim 7 wherein the peripheral wall of the first cavity and the end wall of the first cavity distal from the bulkhead are both located within the lubricant heat absorption cavity.

9. The internally-cooled, coaxial motor axle assembly of claim 1, 2, 3, or 4 further comprising a bearing inner and outer race seal arrangement, said drive motor further comprising a motor housing, a first bearing, and a second bearing, said motor housing being secured to one end of the axle housing; the first bearing is positioned in the axle housing body and comprises a first bearing inner ring, a first bearing outer ring and a first bearing rolling body, the first bearing inner ring is sleeved and fixed on a motor rotating shaft in a sealing manner, the first bearing outer ring is provided with a first bearing outer ring part outward flange, the first bearing outer ring part outward flange is detachably fixed with the axle housing body in a sealing manner, and one end of the first bearing outer ring facing the motor housing is connected with one end of the first bearing inner ring facing the motor housing in a sealing manner through a bearing inner ring and bearing outer ring sealing structure; the second bearing is positioned outside the lubricating oil heat dissipation cavity and comprises a second bearing inner ring, a second bearing outer ring and second bearing rolling bodies, the second bearing inner ring is sleeved and fixed on a motor rotating shaft in a sealing mode, a second bearing outer ring is provided with a second bearing outer ring part flanging, the second bearing outer ring part flanging is detachably fixed with the lubricating oil heat dissipation cavity, and one end, facing the driving motor, of the second bearing outer ring and one end, facing the driving motor, of the second bearing inner ring are connected together in a sealing mode through a bearing inner ring and bearing outer ring sealing structure; the end, far away from the axle shell, of the first output half shaft is connected with a lubricating oil heat dissipation cavity through a third bearing, the third bearing comprises a third bearing inner ring, a third bearing outer ring and a third bearing rolling body, the third bearing inner ring is sleeved and fixed on the first output half shaft in a sealing manner, the third bearing outer ring is provided with a third bearing outer ring portion outward flange, the third bearing outer ring portion outward flange is detachably fixed with the lubricating oil heat dissipation cavity in a sealing manner, and one end, far away from the driving motor, of the third bearing outer ring is connected with one end, far away from the driving motor, of the third bearing inner ring through a bearing inner ring and outer ring sealing structure in a sealing manner; the second output semi-axis rotates through the fourth bearing and connects on the axle casing, and the fourth bearing includes fourth bearing inner circle, fourth bearing outer lane and fourth bearing rolling element, and the sealed cover of fourth bearing inner circle is established and is fixed on second output semi-axis, and the fourth bearing outer lane is equipped with fourth bearing outer lane portion flanging, and fourth bearing outer lane portion flanging is together fixed with axle casing seal detachably, and driving motor's one end is kept away from with fourth bearing inner circle to the fourth bearing outer lane one end is passed through bearing inner circle outer lane seal structure sealing connection is in the same place.

10. The inside-cycle cooled coaxial motor axle assembly of claim 9, the bearing sealing structure comprises a sealing ring and an annular supporting plate, the inner sealing ring is sleeved and fixed on the bearing inner ring in a sealing way, the annular supporting plate is arranged in the bearing inner ring in a penetrating way and is fixedly connected with the bearing inner ring in a sealing way, the radial inner end of the annular supporting plate is fixedly connected with the radial outer end of the elastic sealing ring in a sealing way, the elastic sealing ring comprises a base ring, a first annular elastic sealing lip and a second annular elastic sealing lip which are distributed along the axial direction of the elastic sealing ring, an annular sealing groove is enclosed by the first annular elastic sealing lip and the first annular elastic sealing lip, the opening width of the annular sealing groove is gradually reduced from the opening end of the annular sealing groove to the lower end, the first annular elastic sealing lip and the second annular elastic sealing lip are in sealing butt joint with the outer peripheral surface of the sealing ring.

Technical Field

The invention relates to an axle, in particular to an internal circulation cooling type coaxial motor axle assembly.

Background

The automobile axle is also called as axle, and is connected with the frame or the bearing type automobile body through the suspension, and wheels are arranged at the two ends of the automobile axle. The axle is used for bearing the load of the automobile and maintaining the normal running of the automobile on the road. According to different driving modes, the axle is also divided into a steering axle, a driving axle, a steering driving axle and a supporting axle. Wherein the steering axle and the support axle belong to the driven axle. Most automobiles are front-rear driven, so the front axle is used as a steering axle, the rear axle is used as a driving axle, and the front-drive automobile is used as a steering driving axle, and the rear axle is used as a supporting axle.

In the current axle assembly of the coaxial motor, a water tank is arranged on an axle housing, and then a spray head is used for spraying water outside the motor, so that resources are wasted, and parts with higher temperature are easy to rust when meeting water; in addition, the conventional cooling method for the lubricating oil in the axle housing of the coaxial motor axle assembly is to lead the lubricating oil out of the axle and then cool the lubricating oil in a radiator, and the quality of the lubricating oil is easily reduced due to the long flowing route.

Disclosure of Invention

The invention aims to provide an internal circulation cooling type coaxial motor axle assembly for cooling lubricating oil by circulating in an axle, and solves the problem that the lubricating oil quality is influenced by the fact that the viscosity of the lubricating oil is influenced by the long flowing route of the lubricating oil caused by cooling of the conventional lubricating oil leading-out axle.

The second purpose of the present invention is to provide an internal circulation cooling type coaxial motor axle assembly for cooling a driving motor by sharing a lubricating oil cooling structure, which solves the disadvantages of the existing water spray cooling driving motor.

The technical problem is solved by the following technical scheme: an internal circulation cooling type coaxial motor axle assembly comprises an axle shell, a differential mechanism arranged in the axle shell, a first output half shaft connected to one end of the differential mechanism, a second output half shaft connected to the other end of the differential mechanism, and a driving motor connected to the outside of the axle shell, wherein a motor rotating shaft of the driving motor is of a tubular structure and is sleeved on the first output half shaft, a transmission mechanism for transmitting the torque of the motor rotating shaft to the differential mechanism is arranged in the axle shell, one end of the motor rotating shaft extends into the axle shell, the internal circulation cooling type coaxial motor axle assembly is characterized by further comprising a circulating pump, a heat exchanger, a lubricating oil heat dissipation cavity sleeved on the first output half shaft, and a lubricating oil heat absorption cavity sleeved on the lubricating oil heat dissipation cavity, wherein the other end of the motor rotating shaft penetrates through the lubricating oil heat dissipation cavity and is butted with an inlet end of a centrifugal air pump, be equipped with in the first output semi-axis along the oil return passageway of first output semi-axis axial extension, the one end of first output semi-axis be equipped with intercommunication oil return passageway with the inlet port of lubricating oil heat dissipation chamber intercommunication, the other end are equipped with the oil outlet of intercommunication oil return passageway and axle casing inner space, constitute the intercommunication for clearance fit between motor shaft and the motor shaft the oil feed passageway of axle casing inner space and centrifugal pump bowl entrance point, lubricating oil heat absorption intracavity is filled with cooling medium, and the part of the wall in lubricating oil heat dissipation chamber keeping apart between lubricating oil heat dissipation chamber and lubricating oil heat absorption chamber is made for the heat conduction material and forms, lubricating oil heat absorption chamber is equipped with lubricating oil heat absorption chamber portion cooling medium import and lubricating oil heat absorption chamber portion cooling medium export, and heat exchanger is equipped with first cooling medium entry of exchanger portion, first cooling medium export of exchanger portion, The lubricating oil heat absorption cavity part cooling medium outlet is connected with the heat exchanger part first medium inlet, and the circulating pump is used for enabling the cooling medium to circulate between the heat exchanger and the lubricating oil heat absorption cavity. When the centrifugal air pump is used, the motor rotating shaft drives the half shaft to rotate, so that the centrifugal air pump is driven to rotate in the process of advancing the automobile, the rotating result of the centrifugal air pump is that lubricating oil in the driving axle housing flows into the centrifugal air pump through a gap between the first output half shaft and the motor rotating shaft and then reaches the lubricating oil heat dissipation cavity along the radial direction of the centrifugal air pump (namely the radial outflow of the first output half shaft), and the lubricating oil in the lubricating oil heat dissipation cavity flows back to the axle housing through the oil inlet, the oil return channel and the oil outlet. Therefore, the internal circulation of the lubricating oil is realized, the heat of the lubricating oil is transferred to the cooling medium in the lubricating oil heat absorption cavity when the lubricating oil passes through the lubricating oil heat dissipation cavity so as to be cooled, and the cooling medium in the lubricating oil heat absorption cavity is cooled when flowing through the heat exchanger under the action of the circulating pump and then flows back to the lubricating oil heat absorption cavity from the new position. The cooling process of the heat exchanger is that the low-temperature refrigerant flows in through the second cooling medium inlet of the heat exchanger part and then flows out from the second cooling medium outlet of the heat exchanger part, so as to take away the cooling medium which is sent from the cooling medium (namely the lubricating oil heat absorption cavity) in the flow process of the second cooling medium outlet of the heat exchanger part after flowing in through the first cooling medium inlet of the heat exchanger part. According to the technical scheme, the lubricating oil is internally circulated, so that the fluid circuit is short and the structure is compact. The driving motor for driving the differential mechanism is used for driving to complete the circulation of lubricating oil, so that the structure is more compact.

The motor heat sink also comprises a motor heat dissipation cavity sleeved on the driving motor and a motor heat absorption cavity sleeved on the motor heat dissipation cavity, wherein the motor heat sink is filled with an insulating heat-conducting medium, the cooling medium is also filled in the motor heat absorption cavity, the motor heat absorption cavity is provided with a motor heat absorption cavity part cooling medium inlet and a motor heat absorption cavity part cooling medium outlet, the motor heat absorption cavity part cooling medium inlet is also connected with the heat exchanger part first medium outlet, the motor part cooling medium outlet is also connected with the heat exchanger part first medium inlet, and the circulating pump is also used for circulating the cooling medium between the heat exchanger and the lubricating oil heat absorption cavity. This technical scheme has realized driving motor's non-water spray cooling.

The invention also comprises a three-way valve and a middle annular liquid distribution cavity sleeved on the rotating shaft of the motor, at least two cooling medium outlets of the lubricating oil heat absorption cavity part are arranged on the middle annular liquid distribution cavity, the outlets of the cooling medium of the lubricating oil heat absorption cavity part are distributed along the circumferential direction of the middle annular liquid distribution cavity, the cooling medium outlet of the motor heat absorption cavity part is arranged on the middle annular liquid distribution cavity, the middle annular liquid distribution cavity is provided with a plurality of middle annular liquid distribution cavity part cooling medium outlets communicated with the motor heat absorption cavity, the three-way valve is provided with a three-way valve part inlet, a three-way valve part first outlet and a three-way valve part second outlet, the cooling medium inlet of the lubricating oil heat absorption chamber part is connected with the first outlet of the three-way valve part, the cooling medium inlet of the heat absorption cavity part of the motor is connected with the second outlet of the three-way valve, and the inlet of the three-way valve part is connected with the first cooling medium outlet of the exchanger part. When cooling liquid needs to be cooled (the cooling liquid does not need to be cooled for a long time and is determined according to actual environment and temperature, but a motor is a long-term heat source (works to generate heat) and needs to be cooled for a long time), the cooling liquid firstly flows through a lubricating oil heat absorption cavity to cool lubricating oil in the lubricating oil heat dissipation cavity, then flows through a lubricating oil heat absorption cavity cooling medium inlet, a middle annular liquid distribution cavity and a middle annular liquid distribution cavity cooling medium outlet and then flows through a motor heat absorption cavity to cool the motor (namely, an insulating heat-conducting medium in the motor heat dissipation cavity), and finally flows out of a motor cooling medium outlet to reach a heat exchanger to dissipate heat. When only the motor is cooled, the cooling liquid flows through the motor heat absorption cavity after passing through the motor cooling medium inlet, the middle annular liquid distribution cavity and the cooling medium outlet of the middle annular liquid distribution cavity part to cool the motor (namely, the insulating heat-conducting medium in the motor heat dissipation cavity), and finally flows out of the motor cooling medium outlet to reach the heat exchanger to dissipate heat. This technical scheme can selectively cool off and preferably guarantee the cooling of lubricating oil. The uniformity of the cooling medium flowing out of the lubricating oil heat absorption cavity and entering the motor cavity is good, and the cooling efficiency can be improved.

Preferably, the middle annular air distribution cavity is located at the radial outer end of the lubricating oil heat absorption cavity, the middle annular air distribution cavity is provided with a plurality of liquid inlet pipes which are distributed along the circumferential direction of the middle annular air distribution cavity and extend radially, outlets of the liquid inlet pipes are communicated with the middle annular air distribution cavity, inlets of the liquid inlet pipes form cooling medium outlets of the lubricating oil heat absorption cavity, and the distance between the inlets of the liquid inlet pipes and the inner circumferential surface of the lubricating oil heat absorption cavity is 5 mm to 10 mm. The cooling medium can flow out of the lubricating oil heat absorption cavity after being subjected to sufficient heat exchange with the lubricating oil. The cooling efficiency can be improved.

Preferably, an annular liquid outlet and liquid distribution cavity is arranged in the motor oil heat absorption cavity, a cooling medium outlet of the motor heat absorption cavity is arranged in the annular liquid outlet and liquid distribution cavity, the annular liquid outlet and liquid distribution cavity is provided with a plurality of annular liquid outlet and liquid distribution cavity cooling medium inlets extending along the circumferential direction of the annular liquid outlet and liquid distribution cavity, the annular liquid outlet and liquid distribution cavity is sleeved on the motor rotating shaft, and the annular liquid outlet and liquid distribution cavity and the motor oil heat absorption cavity cooling medium inlets are circumferentially distributed at two ends of the motor heat absorption cavity along the motor rotating shaft. The static flow area generated by the cooling liquid flowing out of the heat absorption cavity of the motor due to the confluence phenomenon can be avoided, and the reliability and the heat exchange cooling efficiency during cooling are improved.

As preferred, be equipped with annular feed liquor cloth liquid chamber in the lubricating oil heat absorption chamber, lubricating oil heat absorption chamber portion cooling medium import sets up annular feed liquor cloth liquid chamber, annular feed liquor cloth liquid chamber is equipped with a plurality of annular feed liquor cloth liquid chamber portion cooling medium exports that extend along annular feed liquor cloth liquid chamber circumference, annular play liquid cloth liquid chamber cover is established on first output semi-axis, annular feed liquor cloth liquid chamber and lubricating oil heat absorption chamber portion cooling medium export are along first output semi-axis axial distribution at the both ends in lubricating oil heat absorption chamber. The cooling device can avoid the phenomenon of confluence of cooling liquid flowing into the lubricating oil heat absorption cavity to generate a static flow area, and improves the reliability and the heat exchange cooling efficiency during cooling.

Preferably, a partition plate is arranged in the lubricating oil heat dissipation cavity, the partition plate divides the lubricating oil heat dissipation cavity into a first cavity and a second cavity which are distributed along the extending direction of a first output half shaft, the centrifugal pumping cylinder is only located in the first cavity, the oil inlet is located in the second cavity, the first output half shaft is connected with the partition plate through a partition plate bearing, and a plurality of communication holes which are distributed along the circumferential direction of the lubricating oil heat dissipation cavity are formed in the radial outer end of the partition plate. Can improve heat exchange efficiency, avoid not being flowed back to axle casing by the lubricating oil of abundant cooling.

Preferably, the peripheral wall of the first cavity and the end wall of the first cavity at the end far away from the partition are both positioned in the lubricating oil heat absorption cavity. The heat exchange efficiency can be improved.

The invention also comprises a bearing inner and outer ring sealing structure, the driving motor also comprises a motor shell, a first bearing and a second bearing, and the motor shell is fixed with one end of the axle shell; the first bearing is positioned in the axle housing body and comprises a first bearing inner ring, a first bearing outer ring and a first bearing rolling body, the first bearing inner ring is sleeved and fixed on a motor rotating shaft in a sealing manner, the first bearing outer ring is provided with a first bearing outer ring part outward flange, the first bearing outer ring part outward flange is detachably fixed with the axle housing body in a sealing manner, and one end of the first bearing outer ring facing the motor housing is connected with one end of the first bearing inner ring facing the motor housing in a sealing manner through a bearing inner ring and bearing outer ring sealing structure; the second bearing is positioned outside the lubricating oil heat dissipation cavity and comprises a second bearing inner ring, a second bearing outer ring and second bearing rolling bodies, the second bearing inner ring is sleeved and fixed on a motor rotating shaft in a sealing mode, a second bearing outer ring is provided with a second bearing outer ring part flanging, the second bearing outer ring part flanging is detachably fixed with the lubricating oil heat dissipation cavity, and one end, facing the driving motor, of the second bearing outer ring and one end, facing the driving motor, of the second bearing inner ring are connected together in a sealing mode through a bearing inner ring and bearing outer ring sealing structure; the end, far away from the axle shell, of the first output half shaft is connected with a lubricating oil heat dissipation cavity through a third bearing, the third bearing comprises a third bearing inner ring, a third bearing outer ring and a third bearing rolling body, the third bearing inner ring is sleeved and fixed on the first output half shaft in a sealing manner, the third bearing outer ring is provided with a third bearing outer ring portion outward flange, the third bearing outer ring portion outward flange is detachably fixed with the lubricating oil heat dissipation cavity in a sealing manner, and one end, far away from the driving motor, of the third bearing outer ring is connected with one end, far away from the driving motor, of the third bearing inner ring through a bearing inner ring and outer ring sealing structure in a sealing manner; the second output semi-axis rotates through the fourth bearing and connects on the axle casing, and the fourth bearing includes fourth bearing inner circle, fourth bearing outer lane and fourth bearing rolling element, and the sealed cover of fourth bearing inner circle is established and is fixed on second output semi-axis, and the fourth bearing outer lane is equipped with fourth bearing outer lane portion flanging, and fourth bearing outer lane portion flanging is together fixed with axle casing seal detachably, and driving motor's one end is kept away from with fourth bearing inner circle to the fourth bearing outer lane one end is passed through bearing inner circle outer lane seal structure sealing connection is in the same place. The bearing of the motor and the bearing for supporting the half shaft can be lubricated by lubricating oil in the axle housing, so that the phenomenon that the bearing is damaged due to forgetting to lubricate in the using process can be avoided. The bearing can also play the effect of sealing the axle housing and prevent that lubricating oil from revealing.

Preferably, bearing seal structure includes sealing washer and annular support board, the sealed cover of interior sealing washer is established and is fixed on the bearing inner race, the annular support board is worn to establish in the bearing inner race and is in the same place with the sealed rigid coupling of bearing inner race, the sealed rigid coupling of the radial inner end of annular support board is in the same place with the radial outer end of elastic sealing ring, elastic sealing ring includes the base ring and along the first annular elastic sealing lip and the second annular elastic sealing lip of elastic sealing ring's axial distribution, and the annular seal ditch is formed in the enclosing of first annular elastic sealing lip and first annular elastic sealing lip, and the opening width of annular seal ditch diminishes from the open end of annular seal ditch to the low end gradually, first annular elastic sealing lip and second annular elastic sealing lip all seal the butt on the outer peripheral face of sealing washer. The technical scheme is good in sealing reliability, and after the elastic sealing ring and the sealing ring are worn due to long-term use, the two sealing plates of the elastic sealing ring generate the supplementary action of the elastic sealing ring so as to continuously maintain reliable sealing.

Preferably, the outer peripheral surface of the sealing ring is provided with a sealing convex ring extending along the circumferential direction of the sealing ring, the sealing convex ring is arranged in the annular sealing groove in a penetrating mode, when the first annular elastic sealing lip and the second annular elastic sealing lip are worn to lose sealing effect with the circumferential surface of the sealing ring, the first annular elastic sealing lip and the second annular elastic sealing lip can be in sealing butt joint with the two axial ends of the sealing convex ring under the action of self elasticity. Can pass through the life of bearing seal structure.

The invention has the following advantages: the lubricating oil can be cooled in a lubricating oil internal circulation mode, so that the mileage of the upper end of the lubricating oil flowing away is small, and the service life of the lubricating oil is shortened due to the influence of a flow passage on the viscosity of the lubricating oil; non-water-spraying cooling of the driving motor is realized.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged partial schematic view of the present invention;

FIG. 3 is an enlarged schematic view of a bearing seal structure;

fig. 4 is a partially enlarged schematic view of a portion a of fig. 2.

In the figure: the axle housing 1, the differential 2, the first output half shaft 3, the second output half shaft 4, the driving motor 5, the bearing inner and outer ring sealing structure 6, the motor housing 7, the motor rotating shaft 8, the first bearing 9, the second bearing 10, the transmission mechanism 11, the first bearing outer ring part flanging 12, the lubricating oil heat dissipation cavity 13, the second bearing outer ring part flanging 14, the circulating pump 15, the heat exchanger 16, the lubricating oil heat absorption cavity 17, the centrifugal air pump cylinder 18, the oil return channel 19, the oil inlet hole 20, the oil outlet pipe 21, the elbow 22, the oil return hole 23, the part 24 of the wall of the lubricating oil heat dissipation cavity, which is isolated between the lubricating oil heat dissipation cavity and the lubricating oil heat absorption cavity, the lubricating oil heat absorption cavity cooling medium inlet 25, the lubricating oil heat absorption cavity cooling medium outlet 26, the exchanger first cooling medium inlet 27, the exchanger first cooling medium outlet 28, the heat exchanger second cooling medium inlet 29, A heat exchanger part second cooling medium outlet 30, a motor heat dissipation cavity 31, a motor heat absorption cavity 32, a motor heat absorption cavity cooling medium inlet 33, a motor heat absorption cavity cooling medium outlet 34, a three-way valve 35, a middle annular liquid distribution cavity 36, a middle annular liquid distribution cavity cooling medium outlet 37, a liquid inlet pipe 39, an annular liquid outlet distribution cavity 40, an annular liquid outlet distribution cavity cooling medium inlet 41, an annular liquid inlet distribution cavity 42, an annular liquid inlet distribution cavity cooling medium outlet 43, a partition plate 44, a first cavity 45, a second cavity 46, a partition plate part bearing 47, a communication hole 48, a first cavity peripheral wall 49, a first cavity end wall 50 far away from one end of the partition plate, a third bearing 51, a third bearing outer ring part flanging 52, a fourth bearing 53, a fourth bearing outer ring part flanging 54, a sealing ring 55, an annular supporting plate 56, a base ring 57, a first annular elastic sealing lip 58, a second sealing lip, a third bearing 51, a third bearing outer ring part flanging 52, a third bearing outer ring part flanging 54, a second bearing outer ring part, a second sealing lip part, a third bearing outer ring part, a second cavity outer ring part, a third bearing outer ring part and a second cavity outer ring part, A second annular elastic sealing lip 59, an annular sealing groove 60 and a sealing convex ring 61.

Detailed Description

The invention is further described with reference to the following figures and examples.

Referring to fig. 1 to 4, an axle assembly of an internal circulation cooling type coaxial motor comprises an axle housing 1, a differential 2 arranged in the axle housing, a first output half shaft 3 connected to one end of the differential, a second output half shaft 4 connected to the other end of the differential, a driving motor 5 connected to the outside of the axle housing, and a plurality of bearing inner and outer ring sealing structures 6. The driving motor comprises a motor shell 7, a motor rotating shaft 8, a first bearing 9 and a second bearing 10. The motor rotating shaft is of a tubular structure and is sleeved on the first output half shaft. A transmission mechanism 11 for transmitting the torque of the motor rotating shaft to a differential is arranged in the axle housing. The motor shell is fixed with one end of the axle shell; the first bearing is positioned in the axle housing body and comprises a first bearing inner ring, a first bearing outer ring and a first bearing rolling body, the first bearing inner ring is sleeved and fixed on a motor rotating shaft in a sealing manner, the first bearing outer ring is provided with a first bearing outer ring part flanging 12, the first bearing outer ring part flanging is detachably fixed with the axle housing body in a sealing manner, and one end of the first bearing outer ring facing the motor housing is connected with one end of the first bearing inner ring facing the motor housing in a sealing manner through a bearing inner ring and bearing outer ring sealing structure 6; the second bearing is located lubricating oil heat dissipation chamber 13 outsidely, and the second bearing includes second bearing inner circle, second bearing outer lane and second bearing rolling element, and the sealed cover of second bearing inner circle is established and is fixed in the motor shaft, and the second bearing outer lane is equipped with second bearing outer lane portion flanging 14, and second bearing outer lane portion flanging is together fixed with lubricating oil heat dissipation chamber detachably, and the one end of second bearing outer lane towards driving motor is through one with the one end of second bearing inner circle towards driving motor the bearing inner circle seal structure 6 sealing connection is in the same place. One end of the motor rotating shaft extends into the axle shell. The invention also comprises a circulating pump 15, a heat exchanger 16, a lubricating oil heat dissipation cavity 13 sleeved on the first output half shaft and a lubricating oil heat absorption cavity 17 sleeved on the lubricating oil heat dissipation cavity. The other end of the motor rotating shaft penetrates through the lubricating oil heat dissipation cavity and is connected with the inlet end of the centrifugal suction cylinder 18. Be equipped with in the first output semi-axis along the oil return passageway 19 of first output semi-axis axial extension, the one end of first output semi-axis is equipped with the inlet port 20 that intercommunication oil return passageway and lubricating oil heat dissipation chamber communicate, the other end is equipped with the oil outlet that docks together with oil pipe 21 that communicates oil return passageway and axle casing inner space, the one end of keeping away from first output semi-axis of oil pipe is equipped with the elbow 22 of buckling towards keeping away from driving motor, be equipped with oil return hole 23 on the terminal surface of elbow, this setting makes the lubricating oil portion that flows back to the axle casing produce easily and is inhaled the phenomenon production in the drive pivot, the cooling effect is good. The motor rotating shaft and the motor rotating shaft are in clearance fit to form an oil inlet channel for communicating the inner space of the axle shell with the inlet end of the centrifugal air pumping cylinder, a cooling medium is filled in the lubricating oil heat absorption cavity, and the part 24 of the wall of the lubricating oil heat dissipation cavity, which is isolated between the lubricating oil heat dissipation cavity and the lubricating oil heat absorption cavity, is made of a heat conduction material. The lubricating oil heat absorption cavity is provided with a lubricating oil heat absorption cavity cooling medium inlet 25 and a lubricating oil heat absorption cavity cooling medium outlet 26, the heat exchanger is provided with an exchanger portion first cooling medium inlet 27, an exchanger portion first cooling medium outlet 28, a heat exchanger portion second cooling medium inlet 29 and a heat exchanger portion second cooling medium outlet 30, the lubricating oil heat absorption cavity cooling medium inlet is connected with the heat exchanger portion first medium outlet, the lubricating oil heat absorption cavity cooling medium outlet is connected with the heat exchanger portion first medium inlet, and the circulating pump is used for enabling cooling medium to circulate between the heat exchanger and the lubricating oil heat absorption cavity.

The invention also comprises a motor heat dissipation cavity 31 sleeved on the driving motor and a motor heat absorption cavity 32 sleeved on the motor heat dissipation cavity, wherein the motor heat dissipation cavity is filled with insulating heat-conducting media, the cooling media are also filled in the motor heat absorption cavity, the motor heat absorption cavity is provided with a motor heat absorption cavity part cooling media inlet 33 and a motor heat absorption cavity part cooling media outlet 34, the motor heat absorption cavity part cooling media inlet is also connected with the heat exchanger part first media outlet, the motor part cooling media outlet is also connected with the heat exchanger part first media inlet, and the circulating pump is also used for circulating the cooling media between the heat exchanger and the lubricating oil heat absorption cavity. The invention also comprises a three-way valve 35 and a middle annular liquid distribution cavity 36 sleeved on the motor rotating shaft. At least two cooling medium outlets of the lubricating oil heat absorption cavity part are arranged on the middle annular liquid distribution cavity, the cooling medium outlets of the lubricating oil heat absorption cavity part are distributed along the circumferential direction of the middle annular liquid distribution cavity, and the cooling medium outlets of the motor heat absorption cavity part are only arranged on the middle annular liquid distribution cavity. The middle annular liquid distribution chamber is provided with a plurality of middle annular liquid distribution chamber part cooling medium outlets 37 communicated with the motor heat absorption chamber, the three-way valve is provided with a three-way valve part inlet, a three-way valve part first outlet and a three-way valve part second outlet, the lubricating oil heat absorption chamber part cooling medium inlet is connected with the three-way valve part first outlet, the motor heat absorption chamber part cooling medium inlet is connected with the three-way valve part second outlet, and the three-way valve part inlet is connected with the exchanger part first cooling medium outlet through the circulating pump. When the cooling device is used, the second cooling medium inlet 29 of the heat exchanger part is connected with a cold air outlet of an air conditioner of an automobile, and the second cooling medium outlet of the heat exchanger part is connected with an air inlet of an internal circulation of the air conditioner. The middle annular air distribution cavity is located at the radial outer end of the lubricating oil heat absorption cavity, the middle annular air distribution cavity is provided with a plurality of liquid inlet pipes 39 which are distributed along the circumferential direction of the middle annular air distribution cavity and extend radially, the outlets of the liquid inlet pipes are communicated with the middle annular air distribution cavity, the inlets of the liquid inlet pipes form cooling medium outlets of the lubricating oil heat absorption cavity, and the distance between the inlets of the liquid inlet pipes and the inner circumferential surface of the lubricating oil heat absorption cavity is 5 mm to 10 mm.

An annular liquid outlet cloth liquid cavity 40 is arranged in the motor oil heat absorption cavity, a cooling medium outlet of the motor heat absorption cavity is arranged in the annular liquid outlet cloth liquid cavity, a plurality of annular liquid outlet cloth liquid cavity cooling medium inlets 41 extending along the circumferential direction of the annular liquid outlet cloth liquid cavity are arranged in the annular liquid outlet cloth liquid cavity, the annular liquid outlet cloth liquid cavity is sleeved on a motor rotating shaft, and the annular liquid outlet cloth liquid cavity and the cooling medium inlets of the motor oil heat absorption cavity are circumferentially distributed at two ends of the motor heat absorption cavity along the motor rotating shaft.

An annular liquid inlet liquid distribution cavity 42 is formed in the lubricating oil heat absorption cavity, a cooling medium inlet of the lubricating oil heat absorption cavity is formed in the annular liquid inlet liquid distribution cavity, a plurality of annular liquid inlet liquid distribution cavity cooling medium outlets 43 extending along the circumferential direction of the annular liquid inlet liquid distribution cavity are formed in the annular liquid inlet liquid distribution cavity, the annular liquid outlet liquid distribution cavity is sleeved on a first output half shaft, and the annular liquid inlet liquid distribution cavity and the lubricating oil heat absorption cavity cooling medium outlets are axially distributed at two ends of the lubricating oil heat absorption cavity along the first output half shaft. The lubricating oil heat dissipation intracavity is equipped with baffle 44, and the baffle is cut apart into along first output semi-axis extending direction distributed first cavity 45 and second cavity 46 with lubricating oil heat dissipation chamber, and the centrifugal pump bowl only is located the first cavity, and the oil inlet is located the second cavity, and first output semi-axis links together with the baffle through baffle portion bearing 47, and the radial outer end of baffle is equipped with a plurality of intercommunicating pores 48 along lubricating oil heat dissipation chamber circumference distribution. The peripheral wall 49 of the first chamber and the end wall 50 of the first chamber at the end remote from the partition are both located within the lubricant heat absorption chamber. One end, far away from the axle shell, of the first output half shaft is connected with a second cavity of the lubricating oil heat dissipation cavity through a third bearing 51, the third bearing comprises a third bearing inner ring, a third bearing outer ring and a third bearing rolling body, the third bearing inner ring is sleeved and fixed on the first output half shaft in a sealing manner, the third bearing outer ring is provided with a third bearing outer ring outward flange 52, the third bearing outer ring outward flange is fixed with the lubricating oil heat dissipation cavity in a sealing and detachable manner, and one end, far away from the driving motor, of the third bearing outer ring and one end, far away from the driving motor, of the third bearing inner ring are connected together in a sealing manner through a bearing inner ring and outer ring sealing structure; the second output semi-axis rotates through fourth bearing 53 and connects on the axle casing, and the fourth bearing includes fourth bearing inner circle, fourth bearing outer lane and fourth bearing rolling element, and the sealed cover of fourth bearing inner circle is established and is fixed on second output semi-axis, and the fourth bearing outer lane is equipped with fourth bearing outer lane portion flanging 54, and fourth bearing outer lane portion flanging is together fixed with axle casing seal detachably, and driving motor's one end is kept away from with fourth bearing inner circle to the fourth bearing outer lane one end is passed through bearing inner circle outer lane seal structure sealing connection is in the same place. The bearing sealing structure comprises a sealing ring 55 and an annular supporting plate 56, the inner sealing ring is sleeved and fixed on the bearing inner ring in a sealing manner (for example, in an adhesive manner), and the annular supporting plate is arranged in the bearing inner ring in a penetrating manner and is fixedly connected with the bearing inner ring in a sealing manner. The radial inner end of the annular supporting plate is fixedly connected with the radial outer end of the elastic sealing ring in a sealing mode, the elastic sealing ring comprises a base ring 57, a first annular elastic sealing lip 58 and a second annular elastic sealing lip 59 which are distributed along the axial direction of the elastic sealing ring, an annular sealing groove 60 is formed by the first annular elastic sealing lip and the first annular elastic sealing lip in a surrounding mode, the opening width of the annular sealing groove is gradually reduced from the opening end of the annular sealing groove to the lower end, and the first annular elastic sealing lip and the second annular elastic sealing lip are connected on the outer peripheral face of the sealing ring in a sealing and abutting mode. The outer peripheral face of the sealing ring is provided with a sealing convex ring 61 extending along the circumferential direction of the sealing ring, the sealing convex ring is arranged in the annular sealing groove in a penetrating mode, when the first annular elastic sealing lip and the second annular elastic sealing lip are worn to the circumferential face of the sealing ring and lose sealing effect, the first annular elastic sealing lip and the second annular elastic sealing lip can be in sealing butt joint with the two axial ends of the sealing convex ring under the action of self elasticity.