Automobile transmission with forced lubrication system

Abstract

An automobile transmission with a forced lubrication system, comprising: a front case, a rear case, an input shaft, an intermediate shaft and an output shaft. The input shaft and the intermediate shaft are located above the output shaft, and an oil pan is provided below the output shaft. Bearings corresponding to the input shaft and the intermediate shaft are provided on the front case, and the intermediate shaft is a hollow shaft. A lubrication mechanism is provided on the front case, the lubrication mechanism comprising an oil pump, an oil filter and an oil pipe connecting the oil pump and the oil filter. An oil pump base is provided on the front case and below the bearing of the intermediate shaft, the oil pump is located in the oil pump base, and the oil filter is located in the oil pan at the bottom of the front case. An oil inlet hole and an oil outlet hole are formed in the oil pump base, the oil inlet hole being connected to the oil pipe, and the oil outlet hole facing the bearing of the intermediate shaft. An oil path is formed in the front case, one end of the oil path being connected to the oil outlet hole, and the other end thereof facing the bearing of the input shaft. The transmission can have a sufficient oil spray volume, thereby achieving an ideal bearing lubrication effect.

Description

Automobile transmission with forced lubrication system Technical Field

[0001] The utility model belongs to the technical field of transmissions, and more particularly relates to an automobile transmission with a forced lubrication system. Background Art

[0002] In new energy pure electric vehicles, a transmission is generally arranged between its motor and the wheel axle. A gear transmission system is arranged inside the transmission. In order to ensure the normal operation of the internal gears, lubricating oil is generally injected into the bottom of the transmission housing to form an oil pool. The lower part of the internal gear is immersed in the lubricating oil, and as the gears rotate, the lubricating oil splashes inside the transmission, thereby lubricating the various internal components. However, this conventional passive lubrication method often cannot throw the lubricating oil to the transmission components at high places (such as gears, bearings, shift mechanisms, etc.), resulting in the transmission components at high places not being effectively lubricated, affecting the overall operation and service life of the transmission.

[0003] Chinese patent publication number CN112610682A discloses an active lubrication and cooling system for a new energy vehicle transmission. An oil pump is connected to the intermediate drive shaft inside the transmission. The oil pump draws lubricating oil from the bottom to a heat exchanger for heat dissipation. The oil is then re-entered into the transmission through an oil pipe connected to the heat exchanger. Several oil holes are provided on the oil pipe, through which lubricating oil is sprayed at fixed points inside the transmission, thereby achieving effective lubrication.

[0004] However, due to the small and complex internal space of the transmission, the oil guide pipe can only be designed to be thinner, which limits the total amount of lubricating oil it can deliver. In order to achieve fixed-point lubrication, several oil holes are opened on the oil guide pipe, which reduces the amount of lubricating oil that can be sprayed from each oil hole. As a result, the actual amount of lubricating oil that can lubricate the bearings is even more limited, resulting in unsatisfactory lubrication effect on the bearings.

[0005] Utility Model Content

[0006] In view of the deficiencies of the prior art, the utility model provides an automobile transmission with a forced lubrication system, which has sufficient oil injection volume and achieves an ideal lubrication effect on the bearings.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an automobile transmission with a forced lubrication system, comprising a front housing, a rear housing, an input shaft, an intermediate shaft, and an output shaft, wherein the input shaft and the intermediate shaft are located above the output shaft, an oil pool is located below the output shaft, and bearings corresponding to the input shaft and the intermediate shaft are provided on the front housing. The utility model is characterized in that: the intermediate shaft is a hollow shaft, a lubrication mechanism is provided on the front housing, the lubrication mechanism includes an oil pump, an oil filter, and an oil pipe connecting the oil pump and the oil filter, an oil pump seat is provided on the front housing below the intermediate shaft bearing, the oil pump is located in the oil pump seat, and the oil filter is located in the oil pool at the bottom of the front housing;

[0008] The oil pump seat is provided with an oil inlet hole and an oil outlet hole, the oil inlet hole is connected to the oil pipe, and the oil outlet hole faces the bearing of the intermediate shaft. An oil channel is provided in the front housing, one end of the oil channel is connected to the oil outlet hole, and the other end faces the bearing of the input shaft.

[0009] Furthermore, the oil pump includes an inner rotor, an outer rotor, an oil pump shaft and an oil pump cover, the inner rotor is connected to the oil pump shaft, the outer rotor is rotatably connected to the oil pump seat, the oil pump cover is connected to the front shell, the oil inlet hole and the oil outlet hole are respectively located on both sides of the inner rotor, and a first lubrication hole is provided on the oil pump cover, the first lubrication hole faces the bearing of the intermediate shaft, and the first lubrication hole is connected to the oil outlet hole.

[0010] Furthermore, a steel sleeve for mounting the input shaft bearing is provided on the front shell, a second lubrication hole connected to the oil channel is provided on the steel sleeve, an oil groove corresponding to the second lubrication hole is provided on the inner side surface of the steel sleeve, and the oil groove extends axially along the inner side surface of the steel sleeve to both sides of the bearing.

[0011] Furthermore, the depth of the oil groove is greater than the width of the input shaft bearing.

[0012] Furthermore, the inner rotor is connected to one end of the oil pump shaft, and the other end of the oil pump shaft passes through the center hole on the oil pump cover and extends into the bushing, and the bushing is connected to the hollow intermediate shaft.

[0013] Furthermore, the oil pump shaft is a hollow shaft, and a third lubrication hole corresponding to the oil pump shaft is provided on the oil pump seat. One end of the third lubrication hole is connected to the intermediate shaft through the hollow oil pump shaft, and the other end of the third lubrication hole is connected to the oil channel.

[0014] Furthermore, an oil inlet storage tank corresponding to the oil inlet hole and an oil outlet storage tank corresponding to the oil outlet hole are provided in the oil pump seat.

[0015] Furthermore, an oil delivery channel connecting the oil inlet hole and the oil pipe is provided on the front shell.

[0016] Compared with the prior art, the beneficial effect of the present invention is that after the lubricating oil is sucked up by the oil pump, the bearing is directly sprayed with oil through the oil pump or the oil channel and lubrication hole inside the front shell, and the amount of oil sprayed is sufficient, so that the lubrication of the bearing achieves an ideal effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG1 is a schematic diagram of the internal structure of an automobile transmission with a forced lubrication system according to the present invention;

[0018] FIG2 is an exploded schematic diagram of the lubrication structure of the automobile transmission with a forced lubrication system according to the present invention;

[0019] FIG3 is a schematic structural diagram of the front housing of an automobile transmission with a forced lubrication system according to the present invention;

[0020] FIG4 is a schematic structural diagram of an oil pump in an automobile transmission with a forced lubrication system according to the present invention;

[0021] FIG5 is a schematic structural diagram of a steel sleeve in an automobile transmission with a forced lubrication system according to the present invention.

[0022] Figure numerals: front housing 1; input shaft 2; intermediate shaft 3; bearing 4; oil pump 5; oil filter 6; oil pipe 7; oil pump seat 8; oil inlet hole 9; oil outlet hole 10; oil channel 11; inner rotor 12; outer rotor 13; oil pump cover 14; first lubrication hole 15; steel sleeve 16; second lubrication hole 17; oil groove 18; oil pump shaft 19; bushing 20; third lubrication hole 21; oil inlet storage tank 22; oil outlet storage tank 23; oil delivery channel 24. DETAILED DESCRIPTION

[0023] In the description of the present invention, it should be noted that, for directional words, such as the terms "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and so on, indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific protection scope of the present invention.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Therefore, the terms "first" and "second" may explicitly or implicitly refer to one or more of these features. In the description of this utility model, "several" and "a number" mean two or more, unless otherwise specifically defined.

[0025] The present invention will be further described with reference to FIG1 to FIG5 .

[0026] An automotive transmission with a forced lubrication system includes a front housing 1, a rear housing, an input shaft 2, an intermediate shaft 3, and an output shaft. The input shaft 2 and the intermediate shaft 3 are located above the output shaft, and an oil sump is located below the output shaft. The front housing 1 is provided with bearings corresponding to the input shaft 2 and the intermediate shaft 3. The intermediate shaft 3 is a hollow shaft. The front housing 1 is provided with a lubrication mechanism, which includes an oil pump 5, an oil filter 6, and an oil pipe 7 connecting the oil pump 5 and the oil filter 6. An oil pump seat 8 is provided below the bearing of the intermediate shaft 3 on the front housing 1. The oil pump 5 is located in the oil pump seat 8, and the oil filter 6 is located in the oil sump at the bottom of the front housing 1.

[0027] The oil pump seat 8 is provided with an oil inlet hole 9 and an oil outlet hole 10. The oil inlet hole 9 is connected to the oil pipe 7, and the oil outlet hole 10 faces the bearing of the intermediate shaft 3. An oil channel 11 (dashed line part) is provided in the front housing 1. One end of the oil channel 11 is connected to the oil outlet hole 10, and the other end faces the bearing of the input shaft 2.

[0028] As shown in Figure 2, in this embodiment, preferably, the oil pump 5 includes an inner rotor 12, an outer rotor 13, an oil pump shaft 19 and an oil pump cover 14. The inner rotor 12 is connected to the oil pump shaft 19, the outer rotor 13 is rotatably connected to the oil pump seat 8, and the oil pump cover 14 is connected to the front housing 1. The oil inlet hole 9 and the oil outlet hole 10 are respectively located on both sides of the inner rotor 12. The oil pump cover 14 is provided with a first lubrication hole 15, which faces the bearing of the intermediate shaft 3 and is connected to the oil outlet hole 10.

[0029] As shown in Figures 2 and 5, in this embodiment, preferably, a steel sleeve 16 for mounting the bearing of the input shaft 2 is provided on the front housing 1, a second lubrication hole 17 connected to the oil channel 11 is provided on the steel sleeve 16, and an oil groove 18 corresponding to the second lubrication hole 17 is provided on the inner side surface of the steel sleeve 16, and the oil groove 18 extends axially along the inner side surface of the steel sleeve 16 to both sides of the bearing.

[0030] As shown in FIG. 5 , in this embodiment, preferably, the depth of the oil groove 18 is greater than the width of the bearing of the input shaft 2 .

[0031] As shown in Figures 2 and 4, in this embodiment, preferably, the inner rotor 12 is connected to one end of the oil pump shaft 19, and the other end of the oil pump shaft 19 passes through the center hole on the oil pump cover 14 and extends into the bushing 20, and the bushing 20 is connected to the hollow intermediate shaft 3.

[0032] As shown in Figures 2 to 4, in this embodiment, preferably, the oil pump shaft 19 is a hollow shaft, and a third lubrication hole 21 corresponding to the oil pump shaft 19 is provided on the oil pump seat 8. One end of the third lubrication hole 21 is connected to the intermediate shaft 3 through the hollow oil pump shaft 19, and the other end of the third lubrication hole 21 is connected to the oil channel 11.

[0033] When the lubricating oil enters the oil passage 11 through the oil outlet hole 10, part of it flows to the second lubrication hole 17 on the steel sleeve 16, and part of it flows into the hollow interior of the intermediate shaft 3 through the third lubrication hole 21. Since both ends of the intermediate shaft 3 are horizontal, the lubricating oil inside will flow to the bearing at one end of the intermediate shaft 3 connected to the oil pump 5, thereby achieving a certain degree of lubrication for the bearing at the other end of the intermediate shaft 3.

[0034] As shown in FIG. 3 , in this embodiment, preferably, an oil inlet storage tank 2218 corresponding to the oil inlet hole 9 and an oil outlet storage tank 2318 corresponding to the oil outlet hole 10 are provided in the oil pump seat 8 .

[0035] As shown in FIG. 2 and FIG. 3 , in this embodiment, preferably, the front housing 1 is provided with an oil delivery channel 24 (solid line portion) connecting the oil inlet hole 9 and the oil pipe 7 .

[0036] As shown in Figures 1 to 4, the electric motor rotates the input shaft 2 of the transmission and transmits power to the output shaft via the intermediate shaft 3. When the intermediate shaft 3 rotates, the inner shaft rotates via the bushing 20 and the oil pump shaft 19, which in turn drives the outer shaft. Lubricating oil in the oil sump is filtered through the oil filter 6 and enters the oil pipe 7. Then, it enters the oil delivery channel 24 through the oil pipe 7 and finally enters the oil pump 5 through the oil inlet hole 9. At this time, part of the lubricating oil is sprayed onto the bearings of the intermediate shaft 3 through the first lubrication hole 15 in the oil pump cover 14. The other part enters the oil passage 11 through the oil outlet hole 10 in the oil pump base 8. From the oil passage 11, the lubricating oil enters the second lubrication hole 17 in the steel sleeve 16 of the input shaft 2. The lubricating oil is sprayed onto the bearings through the second lubrication hole 17, thereby achieving bearing lubrication. After being drawn up by the oil pump 5, the lubricating oil is directly sprayed onto the bearings through the oil pump 5 or the lubrication holes in the front housing 1. The sufficient amount of oil sprayed ensures ideal bearing lubrication.

[0037] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, certain improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An automobile transmission with a forced lubrication system, comprising a front housing, a rear housing, an input shaft, an intermediate shaft and an output shaft, wherein the input shaft and the intermediate shaft are located above the output shaft, an oil pool is located below the output shaft, and bearings corresponding to the input shaft and the intermediate shaft are arranged on the front housing, characterized in that: The intermediate shaft is a hollow shaft. A lubrication mechanism is provided on the front housing. The lubrication mechanism includes an oil pump, an oil filter, and an oil pipe connecting the oil pump and the oil filter. An oil pump seat is provided below the intermediate shaft bearing on the front housing. The oil pump is located in the oil pump seat, and the oil filter is located in the oil pool at the bottom of the front housing. The oil pump seat is provided with an oil inlet hole and an oil outlet hole, the oil inlet hole is connected to the oil pipe, the oil outlet hole faces the bearing of the intermediate shaft, and the front shell is provided with an oil channel, one end of the oil channel is connected to the oil outlet hole, and the other end faces the bearing of the input shaft.

2. The automobile transmission with a forced lubrication system according to claim 1, characterized in that: The oil pump includes an inner rotor, an outer rotor, an oil pump shaft and an oil pump cover, the inner rotor is connected to the oil pump shaft, the outer rotor is rotatably connected to the oil pump seat, the oil pump cover is connected to the front shell, the oil inlet hole and the oil outlet hole are respectively located on both sides of the inner rotor, and the oil pump cover is provided with a first lubrication hole, the first lubrication hole faces the bearing of the intermediate shaft, and the first lubrication hole is connected to the oil outlet hole.

3. The automobile transmission with a forced lubrication system according to claim 2, characterized in that: The front shell is provided with a steel sleeve for mounting the input shaft bearing, the steel sleeve is provided with a second lubrication hole connected to the oil channel, the inner side of the steel sleeve is provided with an oil groove connected to the second lubrication hole, and the oil groove extends axially along the inner side of the steel sleeve to both sides of the bearing.

4. The automobile transmission with a forced lubrication system according to claim 3, characterized in that: The depth of the oil groove is greater than the width of the input shaft bearing.

5. The automobile transmission with a forced lubrication system according to claim 4, characterized in that: The inner rotor is connected to one end of the oil pump shaft, and the other end of the oil pump shaft passes through the center hole on the oil pump cover and extends into the bushing, and the bushing is connected to the hollow intermediate shaft.

6. The automobile transmission with a forced lubrication system according to claim 5, characterized in that: The oil pump shaft is a hollow shaft, and a third lubrication hole corresponding to the oil pump shaft is provided on the oil pump seat. One end of the third lubrication hole is connected to the intermediate shaft through the hollow oil pump shaft, and the other end of the third lubrication hole is connected to the oil channel.

7. The automobile transmission with a forced lubrication system according to claim 6, characterized in that: An oil inlet storage tank corresponding to the oil inlet hole and an oil outlet storage tank corresponding to the oil outlet hole are arranged in the oil pump seat.

8. The automobile transmission with a forced lubrication system according to claim 7, characterized in that: The front shell is provided with an oil delivery channel connecting the oil inlet hole and the oil pipe.

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