Transmission splash lubrication structure with secondary oil stirring function

Abstract

The utility model discloses a transmission splash lubrication structure with secondary oil stirring, which can reliably lubricate a high-speed bearing of an input shaft of a vertically stacked secondary rotation gearbox, and is low in cost and convenient to implement. The differential comprises a first shell and a second shell, the first shell and the second shell are horizontally and oppositely spliced to form an integral shell, the integral shell is sequentially provided with a differential shaft assembly, a middle shaft assembly and an input shaft assembly from bottom to top, and the differential is characterized in that the differential shaft assembly is sleeved with a differential gear; the intermediate shaft assembly is sleeved with an intermediate shaft small gear and an intermediate shaft large gear, and the intermediate shaft small gear and the intermediate shaft large gear synchronously rotate or stop working. An input shaft gear is arranged in the axial middle of the input shaft assembly in a sleeved mode, and input bearings are arranged at the two axial ends of the input shaft assembly in a sleeved mode respectively. The differential gear is in meshed connection with an intermediate shaft pinion, and the intermediate shaft bull gear is in meshed connection with the input shaft gear.

Description

Technical Field

[0001] The utility model relates to the technical field of transmission lubrication, in particular to a transmission splash lubrication structure with secondary oil stirring. Background Art

[0002] The powertrain system of new energy vehicles is increasingly moving towards integration. The space of the vehicle chassis is extremely valuable. Low cost / high performance / miniaturization is the goal that new energy vehicle powertrains are constantly pursuing. In the extended-range or hybrid powertrain architecture, due to the simultaneous existence of the engine's power generation end and the drive end of the drive motor, in order to reduce the volume, the three shaft systems of the secondary reduction transmission of the drive motor are often purchased and arranged in a vertical stacked form, resulting in the input shaft of the transmission being very high. The bearings and oil seals of the input shaft are facing very large lubrication pressure. How to lubricate the input shaft is a technical problem that needs to be solved urgently. Summary of the invention

[0003] In view of the above problems, the utility model provides a transmission splash lubrication structure with secondary oil stirring, which can reliably lubricate the high-speed bearing of the input shaft of the vertically stacked two-stage rotating transmission, and has low cost and is easy to implement.

[0004] A transmission splash lubrication structure with secondary oil stirring, comprising a first housing and a second housing, wherein the first housing and the second housing are horizontally assembled to form an integral housing, wherein a differential shaft assembly, an intermediate shaft assembly, and an input shaft assembly are sequentially arranged in the integral housing from bottom to top, and wherein the differential shaft assembly is sleeved with a differential gear;

[0005] The intermediate shaft assembly is sleeved with an intermediate shaft pinion and an intermediate shaft gear, and the intermediate shaft pinion and the intermediate shaft gear rotate synchronously or stop working;

[0006] An input shaft gear is sleeved on the axial middle part of the input shaft assembly, and input bearings are sleeved on both axial ends of the input shaft assembly;

[0007] The differential gear is meshedly connected to the intermediate shaft pinion gear, and the intermediate shaft gear is meshedly connected to the input shaft gear;

[0008] A first oil guide rib is provided on the inner surface of the end plate of the first housing corresponding to the outer periphery of the differential gear, and a first avoidance notch is provided on the top of the first oil guide rib, and the first avoidance notch is used to pass the lubricating oil splashed along the inner wall of the first oil guide rib;

[0009] The inner surface of the end plate of the second housing is provided with second oil guide ribs at the periphery of the surface area corresponding to the intermediate shaft gear and the input shaft gear. The internal cavity formed by the combination of the second oil guide ribs is the oil guide cavity. The rotation of the intermediate shaft gear drives the lubricating oil in the oil guide cavity to splash;

[0010] An input shaft oil passage is provided at a position corresponding to the input bearing of at least one of the first housing and the second housing. The first housing and the second housing are assembled to form at least one oil box. The oil box includes an oil box oil passage and an oil receiving plate. At least one oil inlet is provided on the upper portion of the oil box oil passage. A docking oil plate is provided on both sides of the oil inlet. The oil box oil passage is connected to the input shaft oil passage, and the input shaft oil passage passes lubricating oil into the input bearing.

[0011] It is further characterized by:

[0012] The first housing and the second housing are respectively provided with independent input shaft oil passages at positions corresponding to their respective input bearings, and the first housing and the second housing are respectively provided with independent oil boxes at positions corresponding to the input shaft oil passages, which makes the structure manufacturing convenient, and the two ends of the oil box are respectively connected to the corresponding input shaft oil passages;

[0013] Input shaft oil passages are respectively arranged on both sides of each input bearing, and the input shaft oil passages are arranged to be tilted downward from the inlet to the outlet to ensure reliable and sufficient lubrication of the input bearings;

[0014] After the first housing and the second housing are assembled, the ends of the oil passages of each oil box are respectively inserted into the oil inlets of the corresponding input shaft oil passages;

[0015] An axially opened oil inlet is provided in the upper area of ​​the oil channel of each oil box, and a pair of oil-connecting plates are arranged in a structure that expands outward from bottom to top to guide the lubricating oil into the oil inlet;

[0016] When the lubricating oil level is relatively low, corresponding housing oil inlet passages are set in the bearing chamber of the differential shaft assembly and the bearing chamber of the intermediate shaft assembly, and corresponding oil boxes are set on the corresponding housings to facilitate the oil to enter the corresponding bearing chambers.

[0017] After the utility model is adopted, among the differential shaft assembly, the intermediate shaft assembly and the input shaft assembly arranged in the vertical direction, only the differential gear can be stirred with the lubricating oil. By designing the first oil guide rib on the first housing, on the one hand, regardless of forward or reverse rotation, under the drive of the differential gear, the lubricating oil can move upward along the oil guide rib, and reach the overlapping area of ​​the first oil guide rib and the second oil guide rib through the first avoidance gap, forming a local oil cavity; on the other hand, due to the existence of the first oil guide rib, the oil stirring loss of the differential gear can be significantly reduced, thereby improving the efficiency of the entire gearbox; on the basis of the oil cavity formed by the first oil guide rib and the second oil guide rib, due to the oil stirring effect of the large gear of the intermediate shaft, the oil will continue to move upward along the annular second oil guide rib under the drive of the large gear of the intermediate shaft, and And affected by the shape of the annular second oil guide rib, the oil will gather above the input shaft. The whole process forms a splash lubrication form in which the differential gear stirs the oil, the local oil chamber accumulates oil, and the large gear of the intermediate shaft continues to stir the oil. The oil reaching the top of the annular second oil guide rib will drop under the action of gravity, and oil boxes are arranged on the sides of the input bearing. Each oil box is composed of an oil receiving plate and an oil box oil channel. The oil receiving plate is very close to the input shaft gear. On the one hand, it can receive the oil falling from the top of the second oil guide rib, and on the other hand, it can collect the oil thrown out by the input shaft gear. The lubricating oil passes through the oil box along the input shaft oil channel and smoothly enters the bearing chambers at both ends to lubricate the bearings and oil seals. It can reliably lubricate the high-speed bearings of the input shaft of the vertically stacked two-stage rotating gearbox, and it is low in cost and easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural diagram of the first housing of the utility model in an assembled state;

[0019] Figure 2 It is a side view structural schematic diagram of the first housing used in the utility model;

[0020] Figure 3 It is a three-dimensional structural diagram of the second housing of the utility model in an assembled state;

[0021] Figure 4 It is a side view structural schematic diagram of the second housing used in the utility model;

[0022] Figure 5 A schematic diagram of the structure of the oil box of the utility model;

[0023] The names corresponding to the serial numbers in the figure are as follows:

[0024] The first housing 1, the first oil guide rib 101, the first avoidance gap 102, the second housing 2, the second oil guide rib 201, the oil guide chamber 202, the differential shaft assembly 3, the differential gear 31, the intermediate shaft assembly 4, the intermediate shaft pinion 41, the intermediate shaft gear 42, the input shaft assembly 5, the input shaft gear 51, the input bearing 52, the input shaft oil passage 6, the oil box 7, the oil box oil passage 71, the oil receiving plate 72, and the oil inlet 73. DETAILED DESCRIPTION

[0025] A transmission splash lubrication structure with secondary oil stirring, see Figure 1-Figure 5 :It includes a first housing 1, a second housing 2, a differential shaft assembly 3, an intermediate shaft assembly 4, and an input shaft assembly 5;

[0026] The first housing 1 and the second housing 2 are horizontally assembled to form an integral housing, and a differential shaft assembly 3, an intermediate shaft assembly 4, and an input shaft assembly 5 are arranged in sequence from bottom to top in the inner cavity of the integral housing, and a differential gear 31 is sleeved on the differential shaft assembly 3;

[0027] The intermediate shaft assembly 4 is sleeved with an intermediate shaft pinion 41 and an intermediate shaft gear 42. The intermediate shaft pinion 41 and the intermediate shaft gear 42 rotate synchronously or stop working. They are two sets of gears on the same structure.

[0028] An input shaft gear 51 is sleeved on the axial middle part of the input shaft assembly 5, and input bearings 52 are sleeved on the axial ends of the input shaft assembly 5 respectively;

[0029] The differential gear 31 is meshedly connected to the intermediate shaft pinion gear 41, and the intermediate shaft large gear 42 is meshedly connected to the input shaft gear 51;

[0030] A first oil guide rib 101 is provided on the inner surface of the end plate of the first housing 1 corresponding to the outer periphery of the differential gear, and a first avoidance notch 102 is provided on the top of the first oil guide rib 101. The first avoidance notch 102 is used to pass the lubricating oil splashed along the inner wall of the first oil guide rib 101;

[0031] A second oil guide rib 201 is provided on the inner surface of the end plate of the second housing 2 corresponding to the periphery of the surface area of ​​the intermediate shaft gear 42 and the input shaft gear 51. The internal cavity formed by the combination of the second oil guide ribs 201 is an oil guide cavity 202. The rotation of the intermediate shaft gear 42 drives the lubricating oil in the oil guide cavity to splash.

[0032] In specific implementation, independent input shaft oil passages 6 are respectively provided at the positions on both sides of the first housing 1 and the second housing 2 corresponding to their respective input bearings 51. After the first housing 1 and the second housing 2 are assembled, independent oil boxes 7 are respectively provided at the positions corresponding to the input shaft oil passages 6 on the same side, which makes the structure easy to manufacture; the oil box 7 includes an oil box oil passage 71 and an oil receiving plate 72. At least one oil inlet 73 is provided on the upper part of the oil box oil passage 71, and a docking oil plate 72 is provided on both sides of the oil inlet 73. The oil box oil passage 71 is connected to the input shaft oil passage 6, and the input shaft oil passage 6 passes the lubricating oil into the input bearing 52.

[0033] The input shaft oil passage 52 is arranged to tilt downward from the inlet to the outlet to form an oil guide angle, which is greater than the maximum climbing gradient designed for the vehicle to ensure reliable and sufficient lubrication of the input bearing; in specific implementation, when the slope is 30%, the oil guide angle should be no less than 17 degrees; or when the slope is 40%, the oil guide angle should be no less than 22 degrees. If the oil guide angle is less than the preset slope, once on the slope, the oil guide structure will fail and the oil cannot be guided to the target area.

[0034] In specific implementation, after the first shell 1 and the second shell 2 are assembled,

[0035] The two ends of the oil box 7 are respectively connected to the corresponding input shaft oil passage 6; after the first housing 1 and the second housing 2 are assembled, the ends of the oil box oil passage 71 of each set of oil boxes 7 are respectively inserted into the oil inlet of the corresponding input shaft oil passage 6;

[0036] An axially opened oil inlet 73 is disposed in the upper area of ​​the oil channel 71 of each oil box 7 , and a pair of oil-connecting plates 72 are arranged in a structure expanding outward from bottom to top to guide the lubricating oil into the oil inlet 73 .

[0037] In specific implementation, when the lubricating oil level is relatively low, corresponding housing oil inlet channels 6 are set in the bearing chamber of the differential shaft assembly 3 and the bearing chamber of the intermediate shaft assembly 4, and corresponding oil boxes 7 are set on the corresponding housings to facilitate the oil to enter the corresponding bearing chambers.

[0038] Its working principle is as follows: the differential shaft assembly, the intermediate shaft assembly, and the input shaft assembly are arranged in the vertical direction, and only the differential gear can be stirred with the lubricating oil. By designing the first oil guide rib on the first housing, on the one hand, regardless of forward or reverse rotation, driven by the differential gear, the lubricating oil can move upward along the oil guide rib, and reach the overlapping area of ​​the first oil guide rib and the second oil guide rib through the first avoidance gap, forming a local oil cavity; on the other hand, because of the existence of the first oil guide rib, the oil stirring loss of the differential gear can be significantly reduced, thereby improving the efficiency of the entire gearbox; on the basis of the oil cavity formed by the first oil guide rib and the second oil guide rib, due to the oil stirring effect of the large gear of the intermediate shaft, the oil will continue to move upward along the annular second oil guide rib driven by the power of the large gear of the intermediate shaft, and Affected by the shape of the annular second oil guide rib, the oil will gather above the input shaft. The whole process forms a splash lubrication form in which the differential gear stirs the oil, the local oil chamber accumulates oil, and the large gear of the intermediate shaft continues to stir the oil. The oil reaching the top of the annular second oil guide rib will drop under the action of gravity, and oil boxes are arranged on the sides of the input bearing. Each oil box is composed of an oil receiving plate and an oil box oil channel. The oil receiving plate is very close to the input shaft gear. On the one hand, it can receive the oil falling from the top of the second oil guide rib, and on the other hand, it can collect the oil thrown out by the input shaft gear. The lubricating oil passes through the oil box along the input shaft oil channel and smoothly enters the bearing chambers at both ends to lubricate the bearings and oil seals. It can reliably lubricate the high-speed bearings of the input shaft of the vertically stacked two-stage rotating gearbox, and it is low in cost and easy to implement.

[0039] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0040] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A transmission splash lubrication structure with secondary oil stirring, comprising a first housing and a second housing, wherein the first housing and the second housing are horizontally assembled to form an integral housing, and a differential shaft assembly, an intermediate shaft assembly, and an input shaft assembly are sequentially arranged in the integral housing from bottom to top, characterized in that: The differential shaft assembly is sleeved with a differential gear; The intermediate shaft assembly is sleeved with an intermediate shaft pinion and an intermediate shaft gear, and the intermediate shaft pinion and the intermediate shaft gear rotate synchronously or stop working; An input shaft gear is sleeved on the axial middle part of the input shaft assembly, and input bearings are sleeved on both axial ends of the input shaft assembly; The differential gear is meshedly connected to the intermediate shaft pinion gear, and the intermediate shaft gear is meshedly connected to the input shaft gear; A first oil guide rib is provided on the inner surface of the end plate of the first housing corresponding to the outer periphery of the differential gear, and a first avoidance notch is provided on the top of the first oil guide rib, and the first avoidance notch is used to pass the lubricating oil splashed along the inner wall of the first oil guide rib; The inner surface of the end plate of the second housing is provided with second oil guide ribs at the periphery of the surface area corresponding to the intermediate shaft gear and the input shaft gear. The internal cavity formed by the combination of the second oil guide ribs is the oil guide cavity. The rotation of the intermediate shaft gear drives the lubricating oil in the oil guide cavity to splash; An input shaft oil passage is provided at a position corresponding to the input bearing of at least one of the first housing and the second housing. The first housing and the second housing are assembled to form at least one oil box. The oil box includes an oil box oil passage and an oil receiving plate. At least one oil inlet is provided on the upper portion of the oil box oil passage. A docking oil plate is provided on both sides of the oil inlet. The oil box oil passage is connected to the input shaft oil passage, and the input shaft oil passage passes lubricating oil into the input bearing.

2. The transmission splash lubrication structure with secondary oil stirring according to claim 1 is characterized by: Independent input shaft oil passages are respectively arranged at positions of the first housing and the second housing corresponding to their respective input bearings, and independent oil boxes are respectively arranged at positions of the first housing and the second housing corresponding to the input shaft oil passages.

3. The transmission splash lubrication structure with secondary oil stirring according to claim 1, characterized in that: Input shaft oil passages are respectively arranged on both sides of each input bearing, and the input shaft oil passages are arranged to be inclined downward from the inlet to the outlet.

4. The transmission splash lubrication structure with secondary oil stirring according to claim 1, characterized in that: After the first housing and the second housing are assembled, the ends of the oil passages of the oil boxes of each group of oil boxes are respectively inserted into the oil inlets of the corresponding input shaft oil passages.

5. The transmission splash lubrication structure with secondary oil stirring according to claim 1, characterized in that: An axially opened oil inlet is arranged in the upper area of ​​the oil channel of each oil box group, and a pair of oil-connecting plates are arranged in a structure expanding from bottom to top to guide the lubricating oil into the oil inlet.

6. The transmission splash lubrication structure with secondary oil stirring according to claim 1, characterized in that: When the lubricating oil level is relatively low, corresponding housing oil inlet passages are provided in the bearing chamber of the differential shaft assembly and the bearing chamber of the intermediate shaft assembly, and corresponding oil boxes are provided on the corresponding housings.

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