Motor shaft spline lubricating oil path structure and automobile

Abstract

The motor shaft spline lubricating oil path structure and the automobile, comprising a motor shell, a motor shaft, an output gear, a rear bearing, a motor shaft oil guide nozzle and a gear compression bolt, the rear end of the motor shaft is connected to the motor shell through the rear bearing, the output gear is sleeved on the front end of the motor shaft, the output gear is connected with the motor shaft through the spline, the gear compression bolt coaxially compresses the output gear on the motor shaft, the first oil guide hole is arranged on the motor shaft oil guide nozzle, the second oil guide hole is arranged on the side wall of the shaft hole of the motor shaft, the rear bearing, the first oil guide hole, the shaft hole, the second oil guide hole and the spline are communicated, and the oil outlet channel for the oil liquid flowing out of the spline is arranged between the gear compression bolt and the output gear. The forced lubricating oil pipe and the oil pump for supplying oil to the forced lubricating oil pipe are cancelled, the second oil guide hole is additionally arranged on the motor shaft, the motor shaft oil guide nozzle is additionally arranged, the spline wear resistance is effectively improved through the lubricating circuit, the structure is simple and compact, and the difficulty of the gearbox arrangement and the part cost are reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of automobile transmission, and particularly relates to a motor shaft spline lubricating oil path structure and an automobile. BACKGROUND

[0002] In recent years, due to the demand for energy saving and environmental protection, new energy vehicles develop rapidly, and hybrid electric vehicles combine the advantages of electric vehicles and traditional vehicles, so they are more and more favored by domestic and foreign automobile enterprises and research institutions, and the research and development of hybrid power systems become a hot spot.

[0003] The current hybrid power system generally has multiple power sources such as electric motors and engines. Today, oil-cooled motors are increasingly used in automobile hybrid power transmissions due to their many advantages. In the modes of hybrid, electric, extended range, and deceleration sliding, the oil-cooled motor provides power, generates electricity, brakes, and the like in the above processes, and needs to frequently switch between different modes. If the spline lubrication is insufficient, rust and wear are easy to occur, which requires a certain amount of lubricating oil at the spline of the motor shaft to form an oil film between the spline tooth engagement surfaces, thereby effectively improving the spline wear resistance.

[0004] For the problem of lubricating the motor shaft spline of the hybrid electric vehicle transmission, the mainstream hybrid electric vehicle transmission currently adopted in the international market adopts a forced lubrication scheme, a forced lubrication oil pipe is designed at the end of the motor shaft, oil is supplied by an oil pump to ensure that a certain amount of oil exists in the inner hole of the motor shaft, and the oil is thrown to the oil hole near the spline by the centrifugal force generated by the rotation of the motor shaft, thereby effectively lubricating the spline and improving the spline wear resistance. This forced lubrication scheme requires a special oil pipe to supply oil by an oil pump, which makes the internal structure of the transmission complex and the cost high.

[0005] At present, the powertrain arrangement space of front-engine front-drive compact cars is increasingly compressed, so the peripheral size of the powertrain is required to be increasingly compact. The forced lubrication scheme for lubricating the spline will lead to an increase in the size of the powertrain, which is not suitable for application to front-engine front-drive compact cars. SUMMARY

[0006] The technical problem to be solved by the present application is to provide a motor shaft spline lubricating oil path structure and an automobile to solve the problems of complex structure and high cost of the existing scheme.

[0007] To solve the above technical problems, the motor shaft spline lubricating oil path structure provided by the embodiments of the present application comprises a motor shell, a motor shaft, an output gear, a rear bearing, a motor shaft oil guide nozzle and a gear compression bolt.

[0008] The rear end of the motor shaft is connected to the motor shell through the rear bearing.

[0009] The output gear is sleeved on the front end of the motor shaft, and the inner periphery of the output gear is connected with the outer periphery of the motor shaft through the spline; the gear compression bolt is screwed with the motor shaft, and the output gear is coaxially compressed on the motor shaft;

[0010] The motor shaft oil guide nozzle is arranged in the motor shell; the motor shaft oil guide nozzle is provided with a first oil guide hole; the motor shaft is provided with a shaft hole; the side wall of the shaft hole is provided with a second oil guide hole; the shaft hole is respectively communicated with the oil outlet end of the first oil guide hole and the oil inlet end of the second oil guide hole; the oil inlet end of the first oil guide hole is communicated with the rear bearing; and the oil outlet end of the second oil guide hole is communicated with the spline.

[0011] An oil outlet channel is arranged between the gear compression bolt and the output gear for the oil flowing out of the spline.

[0012] Optionally, an oil blocking piece is arranged between the motor shaft oil guide nozzle and the motor shaft, and is used for limiting the backflow of the oil from the motor shaft oil guide nozzle and the motor shaft to the rear bearing.

[0013] Optionally, the oil blocking piece is a ring-shaped piece, the ring-shaped piece is embedded in the shaft hole, one end of the motor shaft oil guide nozzle is arranged in the ring-shaped piece, and the inner and outer sides of the ring-shaped piece are respectively matched with the peripheral wall of the motor shaft oil guide nozzle and the peripheral wall of the shaft hole.

[0014] Optionally, the ring-shaped piece comprises a large-aperture section and a small-aperture section, the outer peripheral wall of the large-aperture section and the outer peripheral wall of the small-aperture section are matched with the peripheral wall of the shaft hole, and the inner peripheral wall of the small-aperture section is matched with the outer peripheral wall of the motor shaft oil guide nozzle.

[0015] Optionally, an oil inlet channel is arranged between the motor shell and the rear bearing, and the oil inlet end of the first oil guide hole is communicated with the oil inlet channel.

[0016] Optionally, an oil inlet groove is arranged on the motor shell, and the groove wall of the oil inlet groove and the rear bearing form the oil inlet channel.

[0017] Optionally, the motor shaft oil guide nozzle comprises a guide nozzle body and at least one group of elastic retaining edges arranged on the outer periphery of the guide nozzle body.

[0018] The guide nozzle body is connected to the motor shell, and the first oil guide hole is arranged on the guide nozzle body.

[0019] Each group of elastic retaining edges and the guide nozzle body form a flow guide groove, the flow guide groove corresponds to the oil inlet groove one by one, and the elastic retaining edge extends into the corresponding oil inlet groove and is elastically pressed on the groove wall of the oil inlet groove.

[0020] Optionally, the oil guide nozzle body comprises an oil guide disc and an oil guide column coaxially connected to the oil guide disc, the first oil guide hole penetrates through the oil guide disc and the oil guide column, and the elastic baffle is arranged on the circumferential side of the oil guide disc.

[0021] The oil guide disc is connected with the motor shell and located outside the shaft end of the motor shaft, and the oil guide column extends into the shaft hole.

[0022] Optionally, the gear pressing bolt comprises a bolt head and a rod body, the rod body is screwed to the motor shaft, the bolt head abuts against the end face of the motor shaft and the end face of the output gear, the rear side of the bolt head is provided with an oil outlet groove, and the oil outlet groove is communicated with the spline.

[0023] The embodiment of the present application also provides a car comprising the motor shaft spline lubricating oil path structure.

[0024] The motor shaft spline lubricating oil path structure and the car provided by the embodiment of the present application cancel the forced lubricating oil pipe and the oil pump for supplying oil to the forced lubricating oil pipe, add a second oil guide hole on the motor shaft, and add a motor shaft oil guide nozzle, in use, the oil liquid in the gearbox enters the rear bearing, the first oil guide hole of the motor shaft oil guide nozzle guides the oil liquid at the rear bearing into the shaft hole of the motor shaft, the centrifugal force of the rotating motor shaft throws the oil liquid in the shaft hole into the second oil guide hole, the oil liquid in the second oil guide hole enters the spline, and then flows out from the oil outlet and returns to the gearbox, thereby forming a lubricating circuit, so that the splash lubrication of the spline is realized, the wear resistance of the spline is effectively improved, the structure is simple and compact, the layout difficulty of the gearbox and the cost of parts are reduced, and the space occupation is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The cross-sectional view of the motor shaft spline lubricating oil path structure provided by the embodiment of the present application is shown in the figure;

[0026] Figure 2 The cross-sectional view of the motor shaft spline lubricating oil path structure provided by the embodiment of the present application is shown in the figure; Figure 1 The cross-sectional view of the motor shaft spline lubricating oil path structure provided by the embodiment of the present application is shown in the figure;

[0027] Figure 3 The cross-sectional view of the motor shaft spline lubricating oil path structure provided by the embodiment of the present application is shown in the figure; Figure 1 The cross-sectional view of the motor shaft spline lubricating oil path structure provided by the embodiment of the present application is shown in the figure;

[0028] The reference signs in the specification are as follows:

[0029] 1, motor shell; 2, motor shaft; 201, shaft hole; 202, second oil guide hole;

[0030] 3. Output gear; 4. Rear bearing; 5. Motor shaft oil guide nozzle; 501. Oil guide nozzle body; 5011. First oil guide hole; 5012. Oil guide plate; 5013. Oil guide column; 502. Elastic flange; 5021. Spring; 503. Flow guide groove;

[0031] 6. Gear clamping bolt; 601. Bolt head; 6011. Oil outlet groove; 602. Rod body;

[0032] 7. Splines; 8. Oil retaining parts; 81. Large aperture section; 82. Small aperture section;

[0033] 9. Front bearing; 10. Fixed bushing; 11. Resolver rotor; 12. Motor rotor; 13. Locking nut. Detailed Implementation

[0034] To make the technical problems solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention.

[0035] like Figures 1 to 3 As shown, the motor shaft spline lubrication circuit structure provided in this embodiment of the invention includes a motor housing 1, a motor shaft 2, an output gear 3, a rear bearing 4, a motor shaft oil guide nozzle 5, and a gear clamping bolt 6;

[0036] The rear end of the motor shaft 2 is connected to the motor housing 1 via the rear bearing 4;

[0037] The output gear 3 is sleeved on the front end of the motor shaft 2, and the inner circumference of the output gear 3 is connected to the outer circumference of the motor shaft 2 through the spline 7; the gear clamping bolt 6 is screwed to the motor shaft 2 and coaxially clamps the output gear 3 onto the motor shaft 2;

[0038] The motor shaft oil guide nozzle 5 is located inside the motor housing 1; the motor shaft oil guide nozzle 5 is provided with a first oil guide hole 5011, the motor shaft 2 has a shaft hole 201, and a second oil guide hole 202 is provided on the side wall of the shaft hole 201. The shaft hole 201 is connected to the oil outlet end of the first oil guide hole 5011 and the oil inlet end of the second oil guide hole 202 respectively. The oil inlet end of the first oil guide hole 5011 is connected to the rear bearing 4, and the oil outlet end of the second oil guide hole 202 is connected to the spline 7.

[0039] An oil outlet is provided between the gear clamping bolt 6 and the output gear 3 for the oil to flow out from the spline 7.

[0040] Specifically, the spline 7 includes an inner spline located on the inner circumference of the output gear 3 and an outer spline located on the outer circumference of the motor shaft 2. Through the cooperation of the inner spline and the outer spline, the output gear 3 and the motor shaft 2 are circumferentially positioned, thereby keeping the output gear 3 and the motor shaft 2 rotating synchronously.

[0041] The motor shaft spline lubricating oil path structure provided by the embodiment of the present application cancels the forced lubricating oil pipe and the oil pump for supplying oil to the forced lubricating oil pipe, adds the second oil guide hole 202 on the motor shaft 2, and adds the motor shaft oil guide nozzle 5. In use, the oil in the gearbox enters the rear bearing 4, the first oil guide hole 5011 of the motor shaft oil guide nozzle 5 guides the oil at the rear bearing 4 into the shaft hole 201 of the motor shaft 2, the centrifugal force of the rotation of the motor shaft 2 throws the oil in the shaft hole 201 into the second oil guide hole 202, the oil in the second oil guide hole 202 enters the spline 7, and then flows out from the oil outlet and returns to the gearbox, forming a lubricating circuit, so as to realize the splash lubrication of the spline 7, effectively improve the wear resistance of the spline 7, and reduce the layout difficulty of the gearbox and the cost of parts, reduce the space occupation, and be suitable for compact hybrid gearboxes and front-engine front-drive compact cars.

[0042] In an embodiment, as shown in Figure 1 and Figure 2 , the oil blocking piece 8 is arranged between the motor shaft oil guide nozzle 5 and the motor shaft 2, and is used to limit the backflow of the oil at the shaft hole 201 from between the motor shaft oil guide nozzle 5 and the motor shaft 2 to the rear bearing 4. The oil entering the rear bearing 4 from the gearbox is a small amount, and in order to ensure that enough lubricating oil enters the spline 7, the oil blocking piece 8 is specially arranged to prevent the oil from flowing back from between the motor shaft oil guide nozzle 5 and the motor shaft 2 to the rear bearing 4, thereby improving the lubricating effect of the spline 7.

[0043] In an embodiment, as shown in Figure 1 , the oil blocking piece 8 is a ring-shaped piece, the ring-shaped piece is embedded in the shaft hole 201, one end of the motor shaft oil guide nozzle 5 is arranged in the ring-shaped piece, and the inner and outer sides of the ring-shaped piece are respectively attached to the peripheral wall of the motor shaft oil guide nozzle 5 and the peripheral wall of the shaft hole 201. Through the ring-shaped piece arranged in the motor shaft 2 and the motor shaft oil guide nozzle 5, the gap between the peripheral wall of the shaft hole 201 and the motor shaft oil guide nozzle 5 is closed as much as possible to block the oil, prevent the oil from flowing back from between the motor shaft oil guide nozzle 5 and the motor shaft 2 to the rear bearing 4, and make as much oil as possible to reach the spline 7.

[0044] In an embodiment, as shown in Figure 1As shown, the ring-shaped member includes a large aperture section 81 and a small aperture section 82, the outer peripheral wall of the large aperture section 81 and the outer peripheral wall of the small aperture section 82 are fitted with the peripheral wall of the shaft hole 201, and the inner peripheral wall of the small aperture section 82 is fitted with the outer peripheral wall of the motor shaft oil guide nozzle 5; wherein the "large aperture" and "small aperture" in the large aperture section 81 and the small aperture section 82 are a set of relative concepts, which means that the aperture of the large aperture section 81 is larger than the aperture of the small aperture section 82. The ring-shaped member is embedded in the shaft hole 201, the large aperture section 81 can be used for hoisting the motor shaft 2 during the motor disassembly and assembly process, and can also be used for assembling the motor shaft oil guide nozzle 5, the inner hole of the ring-shaped member has the function of guiding the oil passage in the motor shaft 2, and also realizes oil blocking through the cooperation of the small aperture section 82, the motor shaft oil guide nozzle 5 and the peripheral wall of the shaft hole 201.

[0045] Specifically, the ring-shaped member is improved on the basis of the existing motor shaft steel sleeve used for hoisting the motor shaft 2 during the motor disassembly and assembly process, the inner hole is divided into two sections, one section has a larger aperture than the other section, so as to realize the lubrication of the spline 7 through the optimization of the existing structure and reduce the cost of parts.

[0046] In an embodiment, an oil inlet channel is provided between the motor housing 1 and the rear bearing 4, and the oil inlet end of the first oil guide hole 5011 communicates with the oil inlet channel. The oil inlet channel is provided to ensure that sufficient lubricating oil enters the first oil guide hole 5011, and then ensure that sufficient lubricating oil reaches the spline 7, forming a lubricating oil film at the spline 7.

[0047] Preferably, an oil inlet groove is provided on the motor housing 1, and the groove wall of the oil inlet groove and the rear bearing 4 form an oil inlet channel, which is simple in structure and easy to process.

[0048] In an embodiment, as shown in Figure 1 and Figure 2 the motor shaft oil guide nozzle 5 includes a oil guide nozzle body 501 and at least one set of elastic retaining edges 502 provided on the outer periphery of the oil guide nozzle body 501;

[0049] The oil guide nozzle body 501 is connected to the motor housing 1, and the first oil guide hole 5011 is provided on the oil guide nozzle body 501;

[0050] Each set of elastic retaining edges 502 and the oil guide nozzle body 501 form a flow guide groove 503, and the flow guide groove 503 corresponds to the oil inlet groove one by one, and the elastic retaining edges 502 extend into the corresponding oil inlet groove and press on the groove wall of the oil inlet groove. The elastic retaining edges 502 are added, on the one hand, to increase the connection reliability of the oil guide nozzle body 501 and the motor housing 1, and on the other hand, to guide the oil in the oil inlet groove to the oil inlet end of the first oil guide hole 5011 through the flow guide groove 503, thereby increasing the amount of oil entering the shaft hole 201.

[0051] Preferably, as shown in Figure 2As shown, to simplify the structure, only one set of elastic baffles 502 can be set, and only one corresponding oil inlet groove can be set to avoid too many slots on the motor housing 1.

[0052] Specifically, each set of elastic retaining edges 502 includes two spring pieces 5021.

[0053] In one embodiment, such as Figure 2 As shown, the oil guide nozzle body 501 includes an oil guide plate 5012 and an oil guide column 5013 coaxially connected to the oil guide plate 5012. The first oil guide hole 5011 passes through the oil guide plate 5012 and the oil guide column 5013. The elastic baffle 502 is provided on the periphery of the oil guide plate 5012.

[0054] The oil guide plate 5012 is connected to the motor housing 1 and is located outside the shaft end of the motor shaft 2, and the oil guide column 5013 extends into the shaft hole 201. The structure is simple and easy to assemble.

[0055] When an annular component is provided, the oil guide column 5013 is embedded in the annular component, and the inner circumference of the annular component is in contact with the oil guide column 5013.

[0056] Preferably, such as Figure 2 As shown, the outer periphery of the oil guide plate 5012 is provided with a notch corresponding to the elastic retaining edge 502, thereby increasing the size of the guide groove 503 and making it easier to guide more oil into the first oil guide hole 5011.

[0057] In one embodiment, such as Figure 3 As shown, the gear clamping bolt 6 includes a bolt head 601 and a rod body 602, with the rod body 602 screwed onto the motor shaft 2. The bolt head 601 abuts against the end face of the motor shaft 2 and the end face of the output gear 3. An oil outlet groove 6011 is provided on the rear side of the bolt head 601, which connects to the spline 7. That is, the groove wall of the oil outlet groove 6011 and the end face of the output gear 3 enclose an oil outlet channel. The structure is simple; by adding an oil outlet groove 6011 to the existing bolt head 601, it is possible to ensure that the oil at the spline 7 can flow out and eventually return to the gearbox.

[0058] Specifically, the oil outlet groove 6011 can be configured as one or more; preferably, multiple oil outlet grooves 6011 are evenly distributed on the bolt head 601, and the extension direction of each oil outlet groove 6011 is parallel to the radial direction of the rod body 602, which is more conducive to the rapid flow of oil at the spline 7.

[0059] Specifically, the shaft hole 201 extends axially through the motor shaft 2, and the rod body 602 closes the front end of the shaft hole 201. The shaft hole 201 is a weight-reducing hole for the existing motor shaft 2. By closing the front end of the shaft hole 201 with the rod body 602, the shaft hole 201 can be used to transport oil to the spline 7.

[0060] The preferred scheme of the present application increases the motor shaft oil guide nozzle 5 under the condition of ensuring the original structure and axial length of the motor shaft assembly unchanged, and changes the inner diameter of the motor shaft steel sleeve into two different sections by adding a second oil guide hole on the motor shaft, changes the inner diameter of the motor shaft steel sleeve into two different sections on the basis of the motor shaft steel sleeve, adds an oil groove on the gear pressing bolt, adds an oil inlet groove on the motor housing, and optimizes the part structure to form a lubrication circuit to ensure the lubrication of the spline, so that the spline wear is smaller during work, the reliability is extremely high, and the spline wear resistance can be effectively ensured.

[0061] The embodiment of the present application also provides an automobile comprising the motor shaft spline lubricating oil circuit structure according to any one of the foregoing embodiments. The motor shaft spline lubricating oil circuit structure is adopted, so that the power assembly volume is reduced, and the cost is low.

[0062] In addition, the motor shaft assembly of the automobile also comprises a front bearing 9, a fixed shaft sleeve 10, a rotary variable transducer rotor 11, a motor rotor 12 and a locking nut 13 and the like conventional structures. The motor rotor 12 is coaxially arranged on the motor shaft 2, and one end is abutted on a step of the motor shaft 2, and the locking nut 13 locks the motor rotor 12 on the motor shaft 2 at the other end of the motor rotor 12; the rotary variable transducer rotor 11 is arranged on the motor shaft 2, and one end is abutted on a step of the motor shaft 2, and the fixed shaft sleeve 10 locks the rotary variable transducer rotor 11 on the motor shaft 2 at the other end of the rotary variable transducer rotor 11, and the fixed shaft sleeve 10 is in interference fit with the motor shaft 2; the front bearing 9 and the output gear 3 are coaxially arranged on the motor shaft 2 respectively, one end of the front bearing 9 is abutted on a step of the motor shaft 2, and one end of the output gear 3 is abutted on the other end of the front bearing 9, and the gear pressing bolt 6 locks the output gear 3 and the front bearing 9 together on the motor shaft 2 at the other end of the output gear 3.

[0063] The above is only a preferred embodiment of the present application, and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A lubrication oil circuit structure for a motor shaft spline, characterized in that, This includes the motor housing, motor shaft, output gear, rear bearing, motor shaft oil guide nozzle, and gear clamping bolts; The rear end of the motor shaft is connected to the motor housing via the rear bearing; The output gear is sleeved on the front end of the motor shaft, and the inner circumference of the output gear is connected to the outer circumference of the motor shaft by a spline; the gear clamping bolt is screwed to the motor shaft and coaxially presses the output gear onto the motor shaft; The motor shaft oil guide nozzle is disposed inside the motor housing; the motor shaft oil guide nozzle is provided with a first oil guide hole, the motor shaft has a shaft hole, and a second oil guide hole is provided on the side wall of the shaft hole. The shaft hole is respectively connected to the oil outlet end of the first oil guide hole and the oil inlet end of the second oil guide hole. The oil inlet end of the first oil guide hole is connected to the rear bearing, and the oil outlet end of the second oil guide hole is connected to the spline. An oil outlet channel is provided between the gear clamping bolt and the output gear for the oil to flow out from the spline. The spline includes an internal spline located on the inner circumference of the output gear and an external spline located on the outer circumference of the motor shaft. The circumferential positioning of the output gear and the motor shaft is achieved through the cooperation of the internal and external splines. The shaft hole extends axially through the motor shaft.

2. The motor shaft spline lubrication oil circuit structure according to claim 1, characterized in that, It also includes an oil baffle, which is disposed between the motor shaft oil guide nozzle and the motor shaft and is used to restrict the oil at the shaft hole from flowing back from between the motor shaft oil guide nozzle and the motor shaft to the rear bearing.

3. The motor shaft spline lubrication oil circuit structure according to claim 2, characterized in that, The oil baffle is an annular component, which is embedded in the shaft hole. One end of the motor shaft oil guide nozzle passes through the annular component, and the inner and outer sides of the annular component are respectively in contact with the peripheral wall of the motor shaft oil guide nozzle and the peripheral wall of the shaft hole.

4. The motor shaft spline lubrication oil circuit structure according to claim 3, characterized in that, The annular component includes a large-diameter section and a small-diameter section. The outer peripheral walls of the large-diameter section and the small-diameter section are fitted with the peripheral wall of the shaft hole, and the inner peripheral wall of the small-diameter section is fitted with the outer peripheral wall of the motor shaft oil guide nozzle.

5. The motor shaft spline lubrication oil circuit structure according to claim 1, characterized in that, An oil inlet channel is provided between the motor housing and the rear bearing, and the oil inlet end of the first oil guide hole is connected to the oil inlet channel.

6. The motor shaft spline lubrication oil circuit structure according to claim 5, characterized in that, The motor housing is provided with an oil inlet groove, and the groove wall of the oil inlet groove and the rear bearing form the oil inlet channel.

7. The motor shaft spline lubrication oil circuit structure according to claim 6, characterized in that, The motor shaft oil guide nozzle includes an oil guide nozzle body and at least one set of elastic baffles disposed on the outer periphery of the oil guide nozzle body; The oil guide nozzle body is connected to the motor housing, and the first oil guide hole is provided on the oil guide nozzle body; Each set of elastic baffles and the oil guide nozzle body form a guide groove, and the guide groove corresponds one-to-one with the oil inlet groove. The elastic baffles extend into the corresponding oil inlet groove and press against the groove wall of the oil inlet groove.

8. The motor shaft spline lubrication oil circuit structure according to claim 7, characterized in that, The oil guide nozzle body includes an oil guide disc and an oil guide column coaxially connected to the oil guide disc. The first oil guide hole passes through the oil guide disc and the oil guide column. The elastic baffle is provided on the periphery of the oil guide disc. The oil guide plate is connected to the motor housing and is located outside the shaft end of the motor shaft, and the oil guide column extends into the shaft hole.

9. The motor shaft spline lubrication oil circuit structure according to claim 1, characterized in that, The gear clamping bolt includes a bolt head and a rod body, the rod body being screwed to the motor shaft; the bolt head abuts against the end face of the motor shaft and the end face of the output gear, and an oil outlet groove is provided on the rear side of the bolt head, the oil outlet groove being connected to the spline.

10. A car, characterized in that, The motor shaft spline lubrication circuit structure includes any one of claims 1-9.

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