Power assembly and electric vehicle

Abstract

The utility model provides a power assembly and an electric vehicle. The power assembly comprises a speed reducer and a driving motor; the speed reducer is in transmission connection with the driving motor and wheels of the electric vehicle; the speed reducer comprises two oppositely-arranged shells, the inner walls of the two shells respectively comprise three bearing cavities, and the three bearing cavities of each shell are used for containing and fixing bearings of an input wheel, a middle wheel and an output wheel of the speed reducer respectively. The inner wall of one shell comprises a lubricating oil channel, a strip-shaped protrusion, a strip-shaped groove and another strip-shaped groove. The lubricating oil channel is used for being communicated with a bearing cavity of the input wheel or a bearing cavity of the output wheel, one strip-shaped protrusion penetrates through a lubricating inlet of the lubricating oil channel in the length direction, one strip-shaped groove is formed in one side, in the clockwise direction, of one strip-shaped protrusion, and the other strip-shaped groove is formed in the other side, in the anticlockwise direction, of one strip-shaped protrusion. According to the power assembly and the electric vehicle, the passive lubrication requirement of the bearing in the speed reducer can be met, and the structural arrangement is simple.

Description

[0001] This application is a divisional application of the original application with the application number 202420158264.9 and the original filing date of January 22, 2024, and the entire contents of the original application are incorporated herein by reference. TECHNICAL FIELD

[0002] The embodiments of the present disclosure relate to the field of electric vehicles, in particular to a power assembly and an electric vehicle. BACKGROUND

[0003] In an electric vehicle, a reducer is usually used to drive connect a drive motor and a wheel. During the operation of the reducer, the bearings of the gear assembly need to be lubricated. If the bearings are not sufficiently lubricated, the rotation of the bearings will cause wear. In addition, the heat generated by the friction of the bearings cannot be removed in time, which may cause the bearings to overheat.

[0004] Currently, the lubrication of the reducer bearings usually needs to use an additional oil collecting groove or oil injection device to guide the lubricating oil to the bearings, which is not conducive to the miniaturization of the reducer or the power assembly, and cannot meet the working condition requirements of the counterclockwise rotation or clockwise rotation of the reducer. UTILITY MODEL CONTENTS

[0005] The embodiments of the present disclosure provide a power assembly and an electric vehicle, which can solve the technical problems existing in the related art. Specifically, the technical solutions are as follows.

[0006] In a first aspect, the embodiments of the present disclosure provide a power assembly. The power assembly comprises a reducer and a drive motor, the reducer is used to drive connect the drive motor and a wheel of an electric vehicle, the reducer comprises an input wheel, an intermediate wheel and an output wheel, the input wheel is used to drive connect a motor shaft of the drive motor, the intermediate wheel is used to drive connect the input wheel and the output wheel, the output wheel is used to drive connect the wheel of the electric vehicle, the reducer comprises two oppositely arranged housings, the inner walls of the two housings respectively comprise three bearing cavities, the three bearing cavities of each of the housings are respectively used to accommodate and fix a bearing of the input wheel, the intermediate wheel and the output wheel, the inner wall of one of the housings comprises a lubricating oil channel and a strip-shaped protrusion. Wherein, the lubricating oil channel is used to communicate the bearing cavity of the input wheel or the bearing cavity of the output wheel, the two ends of the strip-shaped protrusion along the length direction thereof are respectively one end facing a lubricating inlet of the lubricating oil channel and the other end away from the lubricating inlet of the lubricating oil channel, and the length direction of the strip-shaped protrusion penetrates the lubricating inlet of the lubricating oil channel. The inner wall of the one housing further comprises a strip-shaped groove and another strip-shaped groove. Wherein, the one strip-shaped groove is arranged on one side of the strip-shaped protrusion along the clockwise direction, and the other strip-shaped groove is arranged on the other side of the strip-shaped protrusion along the counterclockwise direction.

[0007] The housing structure of the power assembly reducer provided by the embodiments of the present disclosure is improved. When the gear rotates in the counterclockwise direction, the lubricating oil stirred by the gear flows along the inner wall of the housing in the counterclockwise direction and is blocked and collected by the strip-shaped protrusion. When the gear rotates in the clockwise direction, the lubricating oil stirred by the gear flows along the inner wall of the housing in the clockwise direction and is blocked by the strip-shaped protrusion. By locating the strip-shaped groove on one side of the strip-shaped protrusion in the clockwise direction, the strip-shaped groove can collect the lubricating oil stirred by the gear in the counterclockwise direction, and facilitate the smooth flow of the lubricating oil through the strip-shaped protrusion. By locating the strip-shaped groove on one side of the strip-shaped protrusion in the counterclockwise direction, the strip-shaped groove can collect the lubricating oil stirred by the gear in the clockwise direction, and facilitate the smooth flow of the lubricating oil through the strip-shaped protrusion. The length direction of one strip-shaped protrusion penetrates the lubricating inlet. It can be ensured that the lubricating oil flowing through one side of the strip-shaped protrusion in the clockwise direction and the other side of the strip-shaped protrusion in the counterclockwise direction can be smoothly guided to the lubricating inlet, ensuring good adaptability to the gear in the forward rotation condition and the reverse rotation condition. In this way, the lubricating oil introduced into the lubricating inlet passes through the lubricating oil channel, and then reaches the bearing, thereby achieving lubrication and cooling of the bearing.

[0008] In some possible implementation manners, the inner wall of the one housing comprises a cylindrical cavity for accommodating the bearing, the cylindrical cavity is the bearing cavity, and the bearing cavity is formed with an annular step for supporting one end face of the bearing, and the annular step is spaced apart in the circumferential direction and provided with at least two notches.

[0009] In some possible implementation manners, the inner wall of the cylindrical cavity is provided with a slot, one end of the slot is in communication with a lubricating outlet of the lubricating oil channel, and one of the at least two notches of the annular step is in communication with the other end of the slot. After the lubricating oil enters the lubricating oil channel, the lubricating oil enters the bearing cavity in sequence through the lubricating outlet, the slot and the one notch of the annular step, thereby lubricating the bearing.

[0010] In some possible implementation manners, the annular step is provided with another notch, the another notch of the annular step is used for oil discharge or is in communication with a through hole structure provided on the inner wall of the cylindrical cavity, so that the lubricating oil sprayed by an oil injection nozzle in the active lubrication structure of the reducer enters the another notch through the through hole structure, thereby actively cooling and lubricating the bearing.

[0011] In some possible implementation manners, the annular step is provided with still another notch, the still another notch of the annular step is arranged opposite to the another notch, and the still another notch and the another notch are used for oil discharge or are used for assisting the installation of the bearing.

[0012] In some possible implementations, the one strip-shaped groove has a groove width at one end thereof closer to the lubricating inlet smaller than a groove width at another end thereof away from the lubricating inlet, and the other strip-shaped groove has a groove width at one end thereof closer to the lubricating inlet smaller than a groove width at another end thereof away from the lubricating inlet. This facilitates further accumulation of lubricating oil at a position close to the lubricating inlet, so as to facilitate inflow of the lubricating oil into the lubricating inlet.

[0013] In some possible implementations, the inner wall of the one housing further comprises a ring-shaped protrusion surrounding the bearing cavity of the input wheel or the bearing cavity of the output wheel, the ring-shaped protrusion comprises the lubricating oil channel for connecting an inner circumferential surface of the ring-shaped protrusion and an outer circumferential surface of the ring-shaped protrusion, the outer circumferential surface of the ring-shaped protrusion comprises the lubricating inlet of the lubricating oil channel, and the inner circumferential surface of the ring-shaped protrusion comprises the lubricating outlet of the lubricating oil channel. The one strip-shaped protrusion is arranged in a spaced manner with the outer circumferential surface of the ring-shaped protrusion at one end thereof closer to the lubricating inlet.

[0014] In some possible implementations, the one strip-shaped groove has a groove width at one end thereof closer to the ring-shaped protrusion smaller than a groove width at another end thereof away from the ring-shaped protrusion, and the other strip-shaped groove has a groove width at one end thereof closer to the ring-shaped protrusion smaller than a groove width at another end thereof away from the ring-shaped protrusion. With the above arrangement, the groove width of the strip-shaped groove at one end thereof closer to the ring-shaped protrusion is smaller, which facilitates further accumulation of lubricating oil at a position close to the lubricating inlet, so as to facilitate inflow of the lubricating oil into the lubricating inlet. The groove width of the strip-shaped groove at another end thereof away from the ring-shaped protrusion is larger, which facilitates flow of the lubricating oil to the strip-shaped protrusion.

[0015] In some possible implementations, the inner wall of the one housing further comprises another strip-shaped protrusion, the one strip-shaped protrusion and the other strip-shaped protrusion are arranged in a spaced manner in a non-parallel and non-intersecting manner, and the other strip-shaped protrusion has two ends in a length direction thereof, one end thereof closer to the lubricating inlet and the other end thereof away from the lubricating inlet. The one end of the other strip-shaped protrusion is connected with the outer circumferential surface of the ring-shaped protrusion.

[0016] In some possible implementations, the distance between the other end of the other strip-shaped protrusion and the one strip-shaped protrusion is greater than the distance between the one end of the other strip-shaped protrusion and the one strip-shaped protrusion. With the distance between the one end of the other strip-shaped protrusion and the one strip-shaped protrusion designed to be smaller, accumulation of lubricating oil at a position between the two strip-shaped protrusions is facilitated, so that the lubricating oil is accumulated at the one end of the one strip-shaped protrusion and then smoothly enters the lubricating inlet of the lubricating oil channel.

[0017] In some possible implementation manners, the length of the one strip-shaped protrusion is greater than the length of the other strip-shaped protrusion. The one strip-shaped protrusion functions as a main oil guide, and the other strip-shaped protrusion functions as an auxiliary oil guide. In this way, on the basis of ensuring the bidirectional oil collection effect of the strip-shaped protrusions, the lightweight design of the shell is also facilitated.

[0018] In some possible implementation manners, the height of the one strip-shaped protrusion along the axial direction of the one gear is greater than the height of the other strip-shaped protrusion along the axial direction of the one gear. Since the one strip-shaped protrusion needs to collect lubricating oil stirred up by the gear in both clockwise and counterclockwise directions, the height is relatively large, which facilitates the sufficient collection of the lubricating oil stirred up by the gear. Since the other strip-shaped protrusion needs to collect lubricating oil falling due to gravity, and functions as an auxiliary oil guide, the height is relatively small, which not only can meet the requirement of sufficient blocking of lubricating oil falling based on gravity, but also facilitates the lightweight design of the shell.

[0019] In some possible implementation manners, any one of the strip-shaped protrusions is arranged above the annular protrusion and inclined relative to the vertical direction. On the one hand, this facilitates the bidirectional collection and flow guiding of the lubricating oil in the shell by the strip-shaped protrusions. On the other hand, when the input wheel is in a low-speed rotation working condition, the inclined arrangement of the strip-shaped protrusions allows the lubricating oil to be more easily stirred to the other end of the strip-shaped protrusion away from the annular protrusion, thereby enhancing the adaptability of the bearing passive lubrication structure to the low-speed rotation working condition of the gear.

[0020] In some possible implementation manners, the inner walls of the two shells surround an envelope structure, the radial dimension of the envelope structure gradually increases from one end of the envelope structure close to the annular protrusion to the other end of the envelope structure away from the annular protrusion, the envelope structure surrounds at least part of the outer periphery of the annular protrusion, and any one of the strip-shaped protrusions is formed in the inner wall of the envelope structure. In this way, the strip-shaped protrusions can not only reliably block the lubricating oil, but also facilitate the reduction of the volume and weight of the strip-shaped protrusions, and further facilitate the lightweight design of the shell.

[0021] In some possible implementation manners, the annular protrusion comprises a gap, the gap of the annular protrusion is used to form the lubricating oil channel, the gap of the annular protrusion comprises one groove wall and another groove wall which are arranged at intervals in a counterclockwise direction, the one groove wall is arranged at an interval on one side of the one strip-shaped protrusion in a clockwise direction, and the another groove wall is arranged at an interval on another side of the one strip-shaped protrusion in a counterclockwise direction. The gap of the annular protrusion is used to form the lubricating oil channel, so that the lubricating oil channel is in a semi-open cavity structure, which has the advantage that the forming process of the lubricating oil channel is simpler and easier to operate. By arranging the one groove wall of the gap at an interval on one side of the one strip-shaped protrusion in a clockwise direction, the lubricating oil stirred by the gear in a counterclockwise direction is more likely to enter the lubricating oil channel formed by the gap through the interval between the one strip-shaped protrusion and the one groove wall of the gap after being guided by the one strip-shaped protrusion.

[0022] In some possible implementation manners, an extension line of the one strip-shaped protrusion in a length direction thereof passes through the gap of the annular protrusion in the middle, and the one groove wall and the another groove wall are arranged at the same interval from the one strip-shaped protrusion.

[0023] In some possible implementation manners, the one strip-shaped groove is used to communicate the interval between the one strip-shaped protrusion and the one groove wall, and the another strip-shaped groove is used to communicate the interval between the one strip-shaped protrusion and the another groove wall. The two strip-shaped grooves can collect the lubricating oil stirred by the gear in the counterclockwise direction and the clockwise direction, and the two strip-shaped grooves respectively communicate the two groove walls of the gap and the interval of the one strip-shaped protrusion, which is more conducive to the inflow of the lubricating oil to the lubricating inlet.

[0024] In some possible implementation manners, the annular protrusion further comprises another gap, the another gap of the annular protrusion is used to flow out the lubricating oil in the bearing cavity, and a width of the another gap of the annular protrusion in a circumferential direction of the annular protrusion is less than a width of the one gap of the annular protrusion. The lubricating oil can flow in and out in the bearing cavity along the rotating bearing, so that the coverage of the lubricating oil is improved. The width of the another gap is less than the width of the one gap, and part of the lubricating oil can flow out through the through hole of the bearing cavity, so that the lubricating effect is improved.

[0025] In some possible implementations, the lubricating oil channel is used to communicate with a bearing cavity of the output gear, and an included angle of any one of the strip-shaped protrusions relative to a line connecting the bearing cavity of the output gear and the bearing cavity of the input gear in a counterclockwise direction is greater than 90 degrees and less than 180 degrees; or, the lubricating oil channel is used to communicate with a bearing cavity of the input gear, and an included angle of any one of the strip-shaped protrusions relative to a line connecting the bearing cavity of the input gear and the bearing cavity of the output gear in a clockwise direction is greater than 90 degrees and less than 180 degrees. The inclined arrangement of the strip-shaped protrusions allows the lubricating oil to be more easily stirred to the other end of the strip-shaped protrusion away from the annular protrusion 11, and enhances the adaptability of the bearing passive lubrication structure involved in the embodiment of the present disclosure to the low-speed rotation working condition of the gear.

[0026] In a second aspect, the embodiment of the present disclosure provides an electric vehicle, the power assembly comprising a wheel and the power assembly according to any one of the preceding aspects and the implementation modes thereof. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 A structural schematic diagram of an exemplary speed reducer provided by the embodiment of the present disclosure;

[0028] Figure 2 A sectional view of an exemplary speed reducer provided by the embodiment of the present disclosure in a first perspective;

[0029] Figure 3 A sectional view of an exemplary speed reducer provided by the embodiment of the present disclosure in a second perspective;

[0030] Figure 4 A structural schematic diagram of an exemplary housing provided by the embodiment of the present disclosure;

[0031] Figure 5 A first partial structural schematic diagram of an exemplary housing provided by the embodiment of the present disclosure;

[0032] Figure 6 A second partial structural schematic diagram of an exemplary housing provided by the embodiment of the present disclosure;

[0033] Figure 7 An arrangement relationship schematic diagram of a housing, a gear and a bearing provided by the embodiment of the present disclosure in a first perspective;

[0034] Figure 8 An arrangement relationship schematic diagram of a housing, a gear and a bearing provided by the embodiment of the present disclosure in a second perspective;

[0035] Figure 9 A structural schematic diagram of an exemplary another housing provided by the embodiment of the present disclosure.

[0036] The reference signs respectively represent:

[0037] 101 / 102, housing;

[0038] 11, annular protrusion; 110, lubricating oil passage; 111, lubricating inlet; 112, lubricating outlet; 114 / 115, notch; 1141 / 1142, groove wall;

[0039] 12 / 13, strip-shaped protrusion; 121, one end of strip-shaped protrusion 12; 122, the other end of strip-shaped protrusion 12; 131, one end of strip-shaped protrusion 13; 132, the other end of strip-shaped protrusion 13;

[0040] 14 / 15, strip-shaped groove;

[0041] 16, annular step; 161 / 162 / 163, notch;

[0042] 17, slotted hole;

[0043] 201, bearing; 202, gear. DETAILED DESCRIPTION

[0044] In the description of the embodiments of the present disclosure, the orientation or positional relationship indicated by the terms "counterclockwise", "clockwise", "height", "length" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present disclosure and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present disclosure.

[0045] An electric vehicle such as an electric vehicle generally adopts a combination of a driving motor and a reducer. The reducer is used to realize the transmission connection between the driving motor and the wheel in the electric vehicle.

[0046] In the embodiments of the present disclosure, the reducer includes a reducer housing and a gear assembly, an input shaft, an output shaft and bearings and the like assembled inside the reducer housing. The input wheel in the gear assembly is connected with the input shaft, the input shaft is assembled in the reducer housing through two bearings located on both sides of the input wheel, and the input shaft is also in transmission connection with the motor shaft of the driving motor. The output wheel in the gear assembly is connected with the output shaft, the output shaft is assembled in the reducer housing through two bearings located on both sides of the output wheel, and the output shaft is used to transmit the wheel.

[0047] As described above, the input shaft and the output shaft in the reducer are both assembled in the reducer housing through bearings. In the working process of the reducer, the bearings need to be lubricated, and the rotation of the bearings will cause wear. In addition, the heat generated by the friction of the bearings cannot be taken away in time, which may cause the bearings to overheat.

[0048] At present, the schemes for lubricating the bearings of the reducer include passive lubrication and active lubrication. The passive lubrication, also known as splash lubrication, stirs the lubricating oil inside the reducer housing through rotation of the gear, so that the lubricating oil splashes and flows to the bearings through the oil channels arranged on the inner wall of the reducer housing, thereby achieving lubrication and cooling of the bearings.

[0049] However, the current passive lubrication scheme for the bearings of the reducer can only meet the passive lubrication of the bearings in a single rotation direction of the gear, and cannot simultaneously meet the passive lubrication requirements of the bearings in the gear rotation and reverse rotation conditions.

[0050] To solve the technical problems in the related art, the present disclosure provides a reducer with double-direction oil collection and lubrication of the housing, which is used for transmission connection between a driving motor of an electric vehicle and a wheel. As shown in FIG. 1, Figure 1 The reducer includes two oppositely arranged housings 101 and 102, and further combines Figure 2 It can be known that the inner walls of the two housings 101 and 102 are respectively used for fixing two bearings 201 corresponding to one gear 202 in the reducer.

[0051] Further combining Figure 3 and Figure 4 It can be known that the inner wall of one housing 101 or 102 includes an annular protrusion 11 and two strip-shaped protrusions 12 and 13. The annular protrusion 11 is used for accommodating and fixing one bearing 201 of one gear 202, and the annular protrusion 11 includes a lubricating oil channel 110 for connecting the inner and outer circumferential surfaces of the annular protrusion 11. The length direction of at least one strip-shaped protrusion 12 or 13 intersects or is parallel to the radial direction of one gear 202. One strip-shaped protrusion 12 is arranged at one side of the other strip-shaped protrusion 13 in the clockwise direction, and each strip-shaped protrusion 12 or 13 includes one end 121 or 131 facing a lubricating inlet 111 of the lubricating oil channel 110. One end 121 of one strip-shaped protrusion 12 is spaced apart from the outer circumferential surface of the annular protrusion 11. One strip-shaped protrusion 12 is used for collecting the lubricating oil stirred by one gear 202 in the counterclockwise direction and guiding the lubricating oil to the lubricating inlet 111. The spacing between one strip-shaped protrusion 12 and the other strip-shaped protrusion 13 is used for collecting the lubricating oil stirred by one gear 202 in the clockwise direction and guiding the lubricating oil to the lubricating inlet 111.

[0052] The housing bidirectional oil collection lubrication reducer provided by the embodiments of the present disclosure is improved by at least one of the housing 101 or the housing 102, two strip-shaped protrusions 12 and 13 and an annular protrusion 11 with a lubricating oil channel 110 are formed on the inner wall of the housing 101 or the housing 102, which can cooperate to form a bearing bidirectional passive lubrication structure. Specifically, by making the length direction of at least one of the strip-shaped protrusions 12 and 13 intersect or parallel to the radial direction of one gear 202, the strip-shaped protrusions 12 and 13 can play the role of lubricating oil baffle and reinforcing rib. By making one strip-shaped protrusion 12 be arranged in the interval on the side of the other strip-shaped protrusion 13 in the clockwise direction, when the gear 202 rotates in the counterclockwise direction, the lubricating oil stirred by the gear 202 flows along the inner wall of the housing 101 or 102 in the counterclockwise direction and is blocked and collected by the strip-shaped protrusion 12, so that the strip-shaped protrusion 12 guides the lubricating oil stirred by the gear 202 in the counterclockwise direction to the lubricating inlet 111. When the gear 202 rotates in the clockwise direction, the lubricating oil stirred by the gear 202 flows along the inner wall of the housing 101 or 102 in the clockwise direction and is blocked by the strip-shaped protrusion 12, while the strip-shaped protrusion 13 prevents the lubricating oil from freely falling due to gravity, so that the interval between the strip-shaped protrusion 12 and the strip-shaped protrusion 13 can collect the lubricating oil stirred by the gear 202 in the clockwise direction and guide it to the lubricating inlet 111. By opening the lubricating oil channel 110 on the annular protrusion 11 accommodating the bearing 201, the lubricating oil channel 110 is used to communicate the inner and outer circumferential surfaces of the annular protrusion 11, so that the lubricating oil introduced into the lubricating inlet 111 reaches the bearing 201 through the lubricating oil channel 110, thereby achieving lubrication and cooling of the bearing 201. It can be seen that the reducer provided by the embodiments of the present disclosure has the bidirectional oil collection lubrication function, which not only can simultaneously meet the passive lubrication requirements of the gear 202 in the forward rotation condition and the reverse rotation condition, but also has the advantages of simple structure arrangement.

[0053] In the embodiments of the present disclosure, one strip-shaped protrusion 12 is arranged in the interval on the side of the other strip-shaped protrusion 13 in the clockwise direction, that is, the strip-shaped protrusion 13 is located on the side of the strip-shaped protrusion 12 in the counterclockwise direction. Then, for the lubricating oil flowing in the clockwise direction, after the lubricating oil enters the interval between the strip-shaped protrusion 12 and the strip-shaped protrusion 13, the strip-shaped protrusion 13 is located on the side of the lubricating oil in the gravity direction, so that when the lubricating oil has the tendency to freely fall due to gravity, the strip-shaped protrusion 13 can block the freely falling lubricating oil, and ensure that the lubricating oil is smoothly guided to the lubricating inlet 111 through the interval between one strip-shaped protrusion 12 and the other strip-shaped protrusion 13.

[0054] In combination with the above-mentioned reducer, in some examples, as shown in the accompanying drawings Figure 5As shown, the height of one strip-shaped protrusion 12 along the axial direction of the gear 202 is greater than the height of the other strip-shaped protrusion 13 along the axial direction of the gear 202.

[0055] The height of the strip-shaped protrusion 12 and the strip-shaped protrusion 13 refers to the dimension of the strip-shaped protrusion 12 and the strip-shaped protrusion 13 along the axial direction of the gear 202, which can also be understood as the dimension of the strip-shaped protrusion 12 and the strip-shaped protrusion 13 along the direction perpendicular to the inner wall of the shell 101, 102.

[0056] The embodiment of the present disclosure has at least the following advantages by making the height of one strip-shaped protrusion 12 greater than the height of the other strip-shaped protrusion 13: Since one strip-shaped protrusion 12 needs to collect lubricating oil stirred by the gear 202 in both clockwise and counterclockwise directions, the strip-shaped protrusion 12 plays a role of a main oil guide, and by making the height of the strip-shaped protrusion 12 relatively large, it is beneficial to fully collect the lubricating oil stirred by the gear 202. Since the other strip-shaped protrusion 13 needs to collect lubricating oil falling due to gravity, the strip-shaped protrusion 13 plays a role of an auxiliary oil guide relative to the strip-shaped protrusion 12, and by making the height of the strip-shaped protrusion 13 relatively small, it not only meets the requirement of the strip-shaped protrusion 13 to fully block the lubricating oil falling based on gravity, but also is beneficial to further reducing the volume and weight of the strip-shaped protrusion 13, which is beneficial to the lightweight design of the shell 101, 102.

[0057] Further, in combination with Figure 5 It can be known that the height of one end 121, 131 of at least one of the two strip-shaped protrusions 12, 13 is greater than the height of the other end 122, 132, for example, Figure 5 It is exemplified that the height of one end 121 of one strip-shaped protrusion 12 is greater than the height of the other end 122, and the height of one end 131 of the other strip-shaped protrusion 13 is greater than the height of the other end 132.

[0058] As Figure 5 shown, the inner wall of the shell 101, 102 surrounds to form an envelope structure, which surrounds at least part of the outer circumference of the annular protrusion 11, can accommodate lubricating oil, and the two strip-shaped protrusions 12, 13 are formed on the inner wall of the envelope structure.

[0059] In some examples, the envelope structure of the shell 101, 102 can be a circular arc cavity, and the radial dimension of the envelope structure gradually increases from one end of the envelope structure close to the annular protrusion 11 to the other end of the envelope structure away from the annular protrusion 11, which allows the lubricating oil stirred by the gear 202 to flow in a rotational flow manner relying on its inertia, so that the lubricating oil is more easily blocked by the strip-shaped protrusion 12.

[0060] Therefore, at least one of the height of the one end 121 of the strip-shaped protrusion 12 and the height of the one end 131 of the strip-shaped protrusion 13 can be designed to be higher, because the radial dimension of the envelope structure is smaller at the position where the one end 121 of the strip-shaped protrusion 12 and the one end 131 of the strip-shaped protrusion 13 are located, and the height of the oil being stirred is higher. Conversely, at least one of the height of the other end 122 of the strip-shaped protrusion 12 and the height of the other end 132 of the strip-shaped protrusion 13 can be designed to be lower (smaller than the height of the one end 121 of the strip-shaped protrusion 12 and the height of the one end 131 of the strip-shaped protrusion 13, respectively), because the radial dimension of the envelope structure is larger at the position where the other end 122 of the strip-shaped protrusion 12 and the other end 132 of the strip-shaped protrusion 13 are located, and the height of the oil being stirred is lower. In this way, not only can the strip-shaped protrusions 12 and 13 reliably block the oil, but also the volume and weight of the strip-shaped protrusions 12 and 13 can be reduced, which is conducive to the lightweight design of the housings 101 and 102.

[0061] On the basis of the height of the end region of the strip-shaped protrusions 12 and 13 satisfying the above characteristics, the height of the non-end region of the strip-shaped protrusions 12 and 13 can be designed to be equal or non-equal. For the non-equal design, for example, the height of the non-end region of the strip-shaped protrusions 12 and 13 can be gradually changed or stepped. Figure 5 Or Figure 6 The height of the strip-shaped protrusion 12 gradually decreases from the one end 121 to the other end 122. Another example can be seen in Figure 5 Or Figure 6 The height of the strip-shaped protrusion 13 gradually decreases from the one end 131 to the other end 132.

[0062] The above describes the arrangement of the strip-shaped protrusions 12 and 13 in the height direction. The following describes the arrangement of the strip-shaped protrusions 12 and 13 in the length direction.

[0063] In the embodiments of the present disclosure, the length direction of at least one of the strip-shaped protrusions 12 and 13 intersects or is parallel to the radial direction of one of the gears 202. The two ends of the strip-shaped protrusion 12 in the length direction are the one end 121 thereof facing the lubricating inlet 111 of the lubricating oil channel 110 and the other end 122 thereof away from the lubricating inlet 111. The two ends of the strip-shaped protrusion 13 in the length direction are the one end 131 thereof facing the lubricating inlet 111 of the lubricating oil channel 110 and the other end 132 thereof away from the lubricating inlet 111.

[0064] Based on the above, one of the strip-shaped protrusions 12 plays a role of a main oil guide, and the other of the strip-shaped protrusions 13 plays a role of an auxiliary oil guide. On this basis, as shown in FIG. 2, the strip-shaped protrusions 12 and 13 are arranged in the length direction of the gears 202.Figure 6 As shown, the length of one strip-shaped protrusion 12 is greater than the length of the other strip-shaped protrusion 13. In this way, on the basis of ensuring the two-way oil collection effect of the strip-shaped protrusions 12, 13, the length of the strip-shaped protrusion 13 is designed to be smaller, which also facilitates the lightweight design of the housings 101, 102.

[0065] Based on the above, the strip-shaped protrusion 12 includes the other end 122 facing away from the lubricating inlet 111 of the lubricating oil channel 110, and the strip-shaped protrusion 13 includes the other end 132 facing away from the lubricating inlet 111 of the lubricating oil channel 110. In some examples, as shown in the accompanying drawings, the other end 122 of one strip-shaped protrusion 12 can be arranged at a distance from the outer circumferential surface of the annular protrusion 11, and the other end 132 of the other strip-shaped protrusion 13 can be arranged at a distance from the outer circumferential surface of the annular protrusion 11. Figure 6 As shown, the distance between the other end 122 of one strip-shaped protrusion 12 and the outer circumferential surface of the annular protrusion 11 can be greater than the distance between the other end 132 of the other strip-shaped protrusion 13 and the outer circumferential surface of the annular protrusion 11.

[0066] That is, the other end 132 of the strip-shaped protrusion 13 does not extend to the outer periphery of the inner wall of the housing 101, 102, so that there is a gap between the other end 132 of the strip-shaped protrusion 13 and the outer periphery of the inner wall of the housing 101, 102, allowing lubricating oil to pass through, and the lubricating oil passing through is then blocked by the strip-shaped protrusion 12 and flows along the strip-shaped protrusion 12.

[0067] Through the above arrangement, on the one hand, the length of the strip-shaped protrusion 12 is long enough to ensure that the strip-shaped protrusion 12 reliably blocks and guides the lubricating oil flowing along the inner wall of the housing 101, 102; on the other hand, the length of the strip-shaped protrusion 13 is small and there is a gap between the length of the strip-shaped protrusion 13 and the outer periphery of the inner wall of the housing 101, 102, so that the lubricating oil stirred by the gear 102 in the clockwise direction can be smoothly collected by the strip-shaped protrusion 12. Since the timing of the lubricating oil falling due to gravity occurs on the path of the lubricating oil being guided by the strip-shaped protrusion 12 to the lubricating inlet 111, at this time, although the strip-shaped protrusion 13 is arranged along its length as described above, the strip-shaped protrusion 13 can still effectively block the lubricating oil falling due to gravity; on the other hand, the length of the strip-shaped protrusion 13 is designed to be smaller, which also facilitates the lightweight design of the housings 101, 102.

[0068] In some examples, the other end 122 of one strip-shaped protrusion 12 can extend to the outer periphery of the inner wall of the housing 101, 102, so as to improve the collection effect of the strip-shaped protrusion 12 on the lubricating oil.

[0069] The housings 101, 102 provided by the embodiments of the present disclosure have one end 121 of one strip-shaped protrusion 12 arranged at a distance from the outer circumferential surface of the annular protrusion 11, and for the other end 131 of the other strip-shaped protrusion 13, the other end 131 can be arranged at a distance from the outer circumferential surface of the annular protrusion 11, or can extend to be connected to the outer circumferential surface of the annular protrusion 11.

[0070] The strip-shaped protrusions 12 and 13 can be arranged in parallel (i.e. equidistantly arranged between each other) or can be arranged in a non-parallel and non-intersecting manner (i.e. the distance between each other is variable). For example, as shown in FIG. 1, the other end 132 of the other strip-shaped protrusion 13 is arranged at a distance W1 from the one strip-shaped protrusion 12, which is greater than the distance W2 between the one end 131 of the other strip-shaped protrusion 13 and the one strip-shaped protrusion 12. Figure 6

[0071] Further, the distance between the other strip-shaped protrusion 13 and the one strip-shaped protrusion 12 can gradually change or change in steps from the other end 132 to the one end 131 of the other strip-shaped protrusion 13. For example, as shown in FIG. 2, the distance between the other strip-shaped protrusion 13 and the one strip-shaped protrusion 12 gradually decreases from the other end 132 to the one end 131 of the other strip-shaped protrusion 13. Figure 6

[0072] By designing the distance W1 between the other end 132 of the other strip-shaped protrusion 13 and the one strip-shaped protrusion 12 to be relatively large, the lubricating oil flowing in the clockwise direction can reliably enter the space between the one strip-shaped protrusion 12 and the other strip-shaped protrusion 13. By designing the distance W2 between the one end 131 of the other strip-shaped protrusion 13 and the one strip-shaped protrusion 12 to be relatively small, the lubricating oil located in the space between the one strip-shaped protrusion 12 and the other strip-shaped protrusion 13 can be gathered and enter the lubricating inlet 111 of the lubricating oil passage 110.

[0073] As shown in FIG. 1, the outer circumferential surface of the annular protrusion 11 includes the lubricating inlet 111 of the lubricating oil passage 110, and the inner circumferential surface of the annular protrusion 11 includes the lubricating outlet 112 of the lubricating oil passage 110. The length direction of the one strip-shaped protrusion 12 passes through the lubricating inlet 111. Further, for example, the length direction of the one strip-shaped protrusion 12 passes through the lubricating inlet 111 centrally. Figure 4

[0074] By the above arrangement, the lubricating oil flowing through the one side in the clockwise direction and the other side in the counterclockwise direction of the one strip-shaped protrusion 12 can be smoothly guided to the lubricating inlet 111, and good adaptability can be achieved for both the forward rotation condition and the reverse rotation condition of the gear 202.

[0075] The above describes the arrangement between the one strip-shaped protrusion 12 and the other strip-shaped protrusion 13. The following further describes the arrangement of the annular protrusion 11 in the housing 101, 102 and the arrangement relationship between the annular protrusion 11 and the one strip-shaped protrusion 12.

[0076] ​​​In one embodiment, the annular protrusion 11 includes a notch 114 for forming a lubricating oil passage 110. The notch 114 includes a groove wall 1141 and another groove wall 1142 spaced apart in a counterclockwise direction. The groove wall 1141 is spaced apart on one side of the strip protrusion 12 in a clockwise direction. The other groove wall 1142 is spaced apart on the other side of the strip protrusion 12 in a counterclockwise direction.

[0077] As attached Figure 5 As shown, the annular protrusion 11 includes a notch 114, which is used to form a lubricating oil passage 110, combined with Figure 6 A notch 114 includes a groove wall 1141 and another groove wall 1142 spaced apart in a counterclockwise direction. The groove wall 1141 is spaced apart on one side of a strip protrusion 12 in a clockwise direction, and the other groove wall 1142 is spaced apart on the other side of a strip protrusion 12 in a counterclockwise direction.

[0078] The reducer and powertrain provided in this embodiment form a lubricating oil passage 110 by providing a notch 114 on the annular protrusion 11, making the lubricating oil passage 110 a semi-open cavity structure. This has the advantage of making the forming and manufacturing process of the lubricating oil passage 110 simpler and easier to operate. By arranging one groove wall 1141 of the notch 114 at intervals on one side of the strip protrusion 12 in a clockwise direction, the lubricating oil stirred up by the gear 202 in a counterclockwise direction is more easily guided by the strip protrusion 12 and enters the lubricating oil passage 110 formed by the notch 114 through the interval between the strip protrusion 12 and one groove wall 1141 of the notch 114. By arranging another groove wall 1142 at intervals on the other side of a strip protrusion 12 in a counterclockwise direction, the lubricating oil stirred up by the gear 202 in a clockwise direction is guided by the strip protrusion 12 and more easily enters the lubricating oil channel 110 formed by the notch 114 through the gap between the strip protrusion 12 and the other groove wall 1142 of the notch 114.

[0079] In one embodiment, as shown in the appendix Figure 5 As shown, the annular protrusion 11 also includes another notch 115. Along the circumference of the annular protrusion 11, the width of the other notch 115 is smaller than the width of the first notch 114. The central angle between the first notch 114 and the other notch 115 in the counterclockwise direction is greater than 180 degrees.

[0080] The annular protrusion 11 also includes another notch 115, the width of which is less than the width of the notch 114 along the circumference of the annular protrusion 11. The central angle between the notch 114 and the notch 115 is greater than 180 degrees in the counterclockwise direction.

[0081] The reducer and power assembly provided by the embodiments of the present disclosure can improve the bearing lubrication effect by arranging another gap 115 on the annular protrusion 11 for the lubricating oil in the bearing cavity to flow out. In addition, the central angle between the one gap 114 and the other gap 115 in the counterclockwise direction is greater than 180 degrees, so that the lubricating oil can flow in and out in the bearing cavity along with the rotating bearing, thereby improving the coverage of the lubricating oil. The width of the other gap 115 is less than the width of the one gap 114, and part of the lubricating oil can flow out through the through hole of the bearing cavity, thereby improving the lubrication effect.

[0082] In some examples, the extension line of the strip-shaped protrusion 12 along the length direction thereof passes through the gap 114 centrally, so that the spacing between the one groove wall 1141 and the other groove wall 1142 and the strip-shaped protrusion 12 can be the same.

[0083] In some examples, the spacing between the one groove wall 1141 and the one strip-shaped protrusion 12 is less than or equal to the spacing between the one end 131 of the other strip-shaped protrusion 13 and the one end 121 of the one strip-shaped protrusion 12, for example, which can make the one end 131 of the other strip-shaped protrusion 13 located outside the other groove wall 1142 of the gap 114, and the one end 131 of the other strip-shaped protrusion 13 does not extend into the gap 114. This not only ensures that there is sufficient spacing between the other groove wall 1142 of the gap 114 and the one strip-shaped protrusion 12 to guide the lubricating oil, but also, for the lubricating oil that may overflow due to gravity at the lubricating inlet 111, the strip-shaped protrusion 13 can reliably block the lubricating oil.

[0084] In some examples, the spacing between the one groove wall 1141 and the one strip-shaped protrusion 12 is greater than the spacing between the one end 131 of the other strip-shaped protrusion 13 and the outer circumferential surface of the annular protrusion 11. Through this arrangement, the one end 131 of the other strip-shaped protrusion 13 is as close as possible to the outer circumferential surface of the annular protrusion 11, thereby improving the blocking effect of the strip-shaped protrusion 13 on the lubricating oil falling due to gravity.

[0085] In combination with any of the reducers described above, in some implementations, as shown in FIGS. 1-3, the one gap 114 is arranged in the clockwise direction, and the other gap 115 is arranged in the counterclockwise direction. Figure 5 In combination with any of the reducers described above, in some implementations, as shown in FIGS. 4-6, the one gap 114 is arranged in the counterclockwise direction, and the other gap 115 is arranged in the clockwise direction. Figure 6 As shown in FIGS. 7-9, the inner wall of the one housing 101, 102 includes two strip-shaped grooves 14, 15, wherein the one strip-shaped groove 14 is arranged on one side of the one strip-shaped protrusion 12 in the clockwise direction, and the one strip-shaped groove 14 is used to communicate the spacing between the one groove wall 1141 and the one strip-shaped protrusion 12; the other strip-shaped groove 15 is arranged on the other side of the one strip-shaped protrusion 12 in the counterclockwise direction, and the other strip-shaped groove 15 is used to communicate the spacing between the other groove wall 1142 and the one strip-shaped protrusion 12.

[0086] The two strip-shaped grooves 14 and 15 intersect or are parallel to the radial direction of a gear 202. By positioning the strip-shaped groove 14 on one side of a strip-shaped protrusion 12 in a clockwise direction, the groove 14 can collect the lubricating oil agitated by the gear 202 in a counter-clockwise direction, promoting smooth flow of the lubricating oil through the protrusion 12. Furthermore, the connection between the groove 14 and the notch 14's groove wall 1141 and the protrusion 12 further facilitates the flow of lubricating oil into the lubrication inlet 111. Similarly, by positioning the strip-shaped groove 15 on one side of a protrusion 12 in a counter-clockwise direction, the groove 15 can collect the lubricating oil agitated by the gear 202 in a clockwise direction, promoting smooth flow of the lubricating oil through the protrusion 12. Furthermore, the connection between the groove 15 and the notch 14's other groove wall 1142 and the protrusion 12 further facilitates the flow of lubricating oil into the lubrication inlet 111.

[0087] As attached Figure 6 As shown, another strip groove 15 is arranged between a strip protrusion 12 and another strip protrusion 13 at one end facing the annular protrusion 11, wherein the groove width of the other strip groove 15 at the end facing the annular protrusion 11 is smaller than the groove width of the other strip groove 15 at the other end away from the annular protrusion 11.

[0088] With the above configuration, on the one hand, the width of the groove at the end of the strip groove 15 facing the annular protrusion 11 is narrower, which facilitates further accumulation of lubricating oil near the lubrication inlet 111, thereby promoting the inflow of lubricating oil into the lubrication inlet 111. On the other hand, the groove at the other end of the strip groove 15 away from the annular protrusion 11 is wider, which facilitates sufficient and reliable collection of lubricating oil coming in the counterclockwise direction, thereby promoting the flow of lubricating oil towards the strip protrusion 12.

[0089] Regarding the groove width of the strip groove 14, the groove width at the end of the strip groove 14 facing the annular protrusion 11 can be made smaller than the groove width at the other end of the strip groove 14 away from the annular protrusion 11, which can achieve the same technical effect as the groove width arrangement of the strip groove 15 mentioned above.

[0090] In conjunction with any of the aforementioned reducers, this disclosure further elaborates on the inner wall structure of housings 101 and 102, and combines... Figure 5 and Figure 6It can be seen that the inner wall of the shell 101, 102 includes a cylindrical cavity for accommodating the bearing 201, that is, a bearing cavity. The two ends of the cylindrical cavity are respectively formed with an annular protrusion 11 and an annular step 16 for supporting one end face of the bearing 201. The inner side wall of the cylindrical cavity has a slot 17, one end of the slot 17 is communicated with the lubricating oil outlet 112, and the annular step 16 is spaced apart in the circumferential direction and has at least two notches, one of which, notch 161, is communicated with the other end of the slot 17, so that the lubricating oil entering the lubricating oil channel 110 is sequentially lubricated and cooled by the lubricating oil outlet 112, the slot 17 and the notch 161.

[0091] In some examples, the annular step 16 has another notch 162 and a further notch 163, which can play a certain oil leakage role. Further, a through hole structure can be provided on the inner side wall of the cylindrical cavity, and the other notch 162 can be communicated with the through hole structure provided on the inner side wall of the cylindrical cavity, so that the notch 162 can be connected to the outside based on the through hole structure, which is beneficial to the setting of the active lubrication structure in the reducer, and in application, the lubricating oil sprayed by the oil nozzle in the active lubrication structure enters the notch 162 through the through hole structure, to actively cool and lubricate the bearing 201.

[0092] When the notch 162 and the notch 163 are relatively spaced apart, the notch 162 and the notch 163 can be used as assembly holes to assist the installation of the bearing 201.

[0093] According to any one of the above-mentioned reducers, in combination Figure 7 and Figure 8 The distance between the end of the gear 202 facing the inner wall of the shell 101, 102 and the corresponding end of the strip-shaped protrusion 12 is defined as H, which is along the axial direction of the gear 202, and the value of H can be 3mm-5mm, which includes but is not limited to: 3mm-3.5mm, 3mm-4mm, 3mm-4.5mm, 3.5mm-4mm, 3.5mm-4.5mm, 3.5mm-5mm, 4mm-4.5mm, 4mm-5mm, etc. By controlling the distance between the gear 202 and the strip-shaped protrusion 12 to be 3mm-5mm, the strip-shaped protrusion 12 can achieve better oil blocking and oil collecting effects.

[0094] In addition, the embodiments of the present disclosure utilize Figures 3-8 Examples of setting a bearing passive lubrication structure on the inner wall of the shell 101, utilizing Figure 9 Examples of setting a bearing passive lubrication structure on the inner wall of the shell 102.

[0095] According to different transmission stage numbers, the speed reducer provided by the embodiments of the present disclosure can be a single-stage speed reducer or a multi-stage speed reducer, including but not limited to a two-stage speed reducer, a three-stage speed reducer, etc.

[0096] In some examples, the speed reducer provided by the embodiments of the present disclosure is a multi-stage speed reducer, which includes an input wheel, an intermediate wheel, and an output wheel. The input wheel is used to drivingly connect a motor shaft of a driving motor. The intermediate wheel is used to drivingly connect the input wheel and the output wheel. The output wheel is used to drivingly connect a wheel of an electric vehicle. The inner walls of the two housings 101 and 102 each include three bearing cavities. The three bearing cavities of each of the two housings 101 and 102 are respectively used to accommodate and fix a bearing of the input wheel, the intermediate wheel, and the output wheel.

[0097] In an embodiment, the bearing passive lubrication structure formed by the annular protrusion 11 and the strip-shaped protrusions 12 and 13 is formed on the inner walls of the two housings 101 and 102 corresponding to the output wheel. The lubricating oil stirred by the output wheel in the clockwise direction and the counterclockwise direction is used to realize bidirectional passive lubrication of the two bearings corresponding to the output wheel. For this scheme, refer to Figure 4 The annular protrusion 11 surrounds the bearing cavity of the output wheel. The lubricating oil channel 110 is used to communicate the bearing cavities of the output wheel. The included angle between any one of the strip-shaped protrusions 12 and 13 and the line L connecting the bearing cavities of the output wheel and the input wheel in the counterclockwise direction is greater than 90 degrees and less than 180 degrees. The range of the included angle can also be 100 degrees-170 degrees, further can be 110 degrees-160 degrees, 120 degrees-150 degrees, etc.

[0098] In the application scenario of the speed reducer, any one of the strip-shaped protrusions 12 and 13 is arranged obliquely relative to the vertical direction above the annular protrusion 11. On the one hand, this is conducive to bidirectional collection and flow guiding of the lubricating oil in the housings 101 and 102 by the strip-shaped protrusions 12 and 13. On the other hand, when the input wheel is in a low-speed rotation working condition, the oblique arrangement of the strip-shaped protrusions 12 and 13 allows the lubricating oil to be more easily stirred to the other end 122 and 131 of the strip-shaped protrusion 12 and 13 away from the annular protrusion 11, thereby enhancing the adaptability of the bearing passive lubrication structure related to the embodiments of the present disclosure to the low-speed rotation working condition of the gear.

[0099] In another embodiment, a passive lubrication structure for bearings, consisting of annular protrusions 11, strip protrusions 12, 13, etc., is formed on the inner walls of the two housings 101, 102 corresponding to the input wheel. This structure utilizes the lubricating oil agitated by the input wheel in both clockwise and counterclockwise directions to achieve bidirectional passive lubrication of the two bearings corresponding to the input wheel. In this embodiment, the annular protrusions 11 surround the bearing cavity of the input wheel, and the lubrication oil passage 110 connects to the bearing cavity of the input wheel. The angle between any strip protrusion 12, 13 and the line connecting the bearing cavities of the input and output wheels in the clockwise direction is greater than 90 degrees and less than 180 degrees (not shown in the figure). This angle can also range from 100 degrees to 170 degrees, and further from 110 degrees to 160 degrees, 120 degrees to 150 degrees, etc.

[0100] Similarly, this not only facilitates the bidirectional collection and diversion of lubricating oil inside the housings 101 and 102 by the strip protrusions 12 and 13, but also enhances the adaptability of the passive bearing lubrication structure of the present disclosure embodiment to low-speed gear rotation conditions.

[0101] In this disclosure, the aforementioned implementation scheme and the other implementation scheme may exist individually or simultaneously.

[0102] The following example further illustrates the passive lubrication process of bearings in a reducer, with reference to an embodiment in which the passive lubrication structure of the bearings is formed on the inner walls of the two housings 101 and 102 corresponding to the output wheel.

[0103] As attached Figure 4 As shown, when gear 202 rotates counterclockwise, it can agitate the lubricating oil in the same counterclockwise direction, thereby driving the lubricating oil to move along... Figure 4 The oil flows and splashes along path A to one side of a strip protrusion 12 in a clockwise direction. Under the action of gravity, the lubricating oil flows and is guided by the strip protrusion 12 to the lubrication inlet 111, and then enters the lubrication channel 110, finally reaching the bearing 201 for lubrication and cooling.

[0104] As attached Figure 4 As shown, when gear 202 rotates clockwise, it can agitate the lubricating oil in the clockwise direction, thereby driving the lubricating oil fluid. Figure 4 The oil flows and splashes along path B to the other side of a strip protrusion 12 in a clockwise direction. Due to gravity, the lubricating oil tends to fall. With the cooperation of another strip protrusion 13, the lubricating oil falling due to gravity is blocked. The lubricating oil flows through the gap between the strip protrusions 12 and 13 to the lubrication inlet 111, and then enters the lubrication channel 110, finally reaching the bearing 201 for lubrication and cooling.

[0105] It can be seen that the speed reducer provided by the embodiment of the present disclosure meets the bearing passive lubrication requirements in the forward rotation and reverse rotation working conditions of the driving motor, and makes up for the unreliable risk of the active lubrication scheme at low temperature. Moreover, the bidirectional oil collection and lubrication structure arranged on the housings 101 and 102 of the speed reducer is relatively simple, the bidirectional oil collection and lubrication structure can be integrally formed on the housings, which is beneficial to reduce the cost and facilitate the large-scale industrial production.

[0106] In another aspect, the embodiment of the present disclosure also provides a power assembly, which comprises any one of the housings bidirectional oil collection and lubrication speed reducers and driving motors described above, the motor shaft of the driving motor is used for transmission connection with the input shaft of the speed reducer, and the input shaft of the speed reducer is used for transmission connection with the input wheel of the speed reducer.

[0107] The power assembly provided by the embodiment of the present disclosure has all the advantages of the housing bidirectional oil collection and lubrication speed reducer provided by the embodiment of the present disclosure. In some examples, the power assembly can be applied to an electric vehicle, for example, can be a three-in-one electric drive power assembly or a multi-in-one electric drive power assembly of an electric vehicle, and is suitable for the front drive and rear drive of the electric vehicle.

[0108] The above is only for facilitating the understanding of the technical solution of the present disclosure by those skilled in the art, and is not used to limit the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A powertrain, characterized by, The power assembly comprises a reducer and a driving motor, the reducer is used for driving connection between the driving motor and a wheel of an electric vehicle, the reducer comprises two oppositely arranged housings, inner walls of the two housings respectively comprise three bearing cavities, the three bearing cavities of each of the two housings are respectively used for accommodating and fixing a bearing of an input wheel, an intermediate wheel and an output wheel of the reducer, the inner wall of one of the two housings comprises: a lubricating oil channel, the lubricating oil channel is used for communication between a bearing cavity of the input wheel or a bearing cavity of the output wheel, one strip-shaped protrusion, two ends of the one strip-shaped protrusion along a length direction of the one strip-shaped protrusion are respectively one end of the one strip-shaped protrusion facing a lubricating inlet of the lubricating oil channel and the other end of the one strip-shaped protrusion away from the lubricating inlet of the lubricating oil channel, the length direction of the one strip-shaped protrusion penetrates the lubricating inlet of the lubricating oil channel, one strip-shaped groove and another strip-shaped groove, the one strip-shaped groove is arranged on one side of the one strip-shaped protrusion in a clockwise direction, and the other strip-shaped groove is arranged on the other side of the one strip-shaped protrusion in an anticlockwise direction.

2. The powertrain of claim 1, wherein, The inner wall of the one of the two housings comprises a cylindrical cavity used for accommodating the bearing, the cylindrical cavity is the bearing cavity, the bearing cavity is formed with an annular step used for supporting one end face of the bearing, and the annular step is distributed with at least two notches in a circumferential direction.

3. The powertrain of claim 2, wherein, An inner side wall of the cylindrical cavity is provided with a slot, one end of the slot is communicated with a lubricating outlet of the lubricating oil channel, and one of the at least two notches of the annular step is communicated with the other end of the slot, lubricating oil entering the lubricating oil channel enters the bearing in sequence through the lubricating outlet, the slot and the one notch of the annular step to lubricate the bearing.

4. The powertrain of claim 2 or 3, wherein, The annular step has another notch, the another notch of the annular step is used for oil discharge or is communicated with a through hole structure arranged on the inner side wall of the cylindrical cavity, so that lubricating oil sprayed by an oil injection nozzle in a forced lubrication structure of the reducer enters the another notch through the through hole structure to force cool and lubricate the bearing.

5. The powertrain of claim 4, wherein, The annular step has still another notch, the still another notch of the annular step is arranged opposite to the another notch, and the still another notch and the another notch are used for oil discharge or are used for assisting installation of the bearing.

6. The powertrain of claim 1, wherein, A groove width of one end of the one strip-shaped groove facing the lubricating inlet is smaller than a groove width of the other end of the one strip-shaped groove away from the lubricating inlet, and a groove width of one end of the other strip-shaped groove facing the lubricating inlet is smaller than a groove width of the other end of the other strip-shaped groove away from the lubricating inlet.

7. The powertrain of claim 1, wherein, The inner wall of the one housing further comprises an annular protrusion surrounding a bearing cavity of the input gear or a bearing cavity of the output gear, the annular protrusion comprising the lubricating oil passage for communicating an inner circumferential surface of the annular protrusion and an outer circumferential surface of the annular protrusion, the outer circumferential surface of the annular protrusion comprising a lubricating inlet of the lubricating oil passage, the inner circumferential surface of the annular protrusion comprising a lubricating outlet of the lubricating oil passage, the one strip protrusion being spaced apart from the outer circumferential surface of the annular protrusion at an end of the one strip protrusion towards the lubricating inlet.

8. The powertrain of claim 7, wherein, A groove width of the one strip groove at an end of the one strip groove towards the annular protrusion is less than a groove width of the one strip groove at another end of the one strip groove away from the annular protrusion, and a groove width of the other strip groove at an end of the other strip groove towards the annular protrusion is less than a groove width of the other strip groove at another end of the other strip groove away from the annular protrusion.

9. The powertrain of claim 7, wherein, The inner wall of the one housing further comprises another strip protrusion, the one strip protrusion and the other strip protrusion being spaced apart non-parallelly and non-intersectingly, the other strip protrusion having two ends along a length direction of the other strip protrusion, the two ends being an end of the other strip protrusion towards the lubricating inlet and another end of the other strip protrusion away from the lubricating inlet respectively, the end of the other strip protrusion towards the lubricating inlet being connected to the outer circumferential surface of the annular protrusion.

10. The powertrain of claim 9, wherein, The other strip protrusion has a distance between the other end of the other strip protrusion and the one strip protrusion greater than a distance between the end of the other strip protrusion towards the lubricating inlet and the one strip protrusion.

11. The powertrain of claim 10, wherein, The one strip protrusion has a height along an axial direction of the one gear greater than a height along the axial direction of the one gear of the other strip protrusion.

12. The powertrain of any of claims 9-11, wherein the clutch is a wet clutch. The one strip protrusion has a length greater than a length of the other strip protrusion.

13. The powertrain of any of claims 7-11, wherein, Any of the strip protrusions is arranged above the annular protrusion and inclined relative to a vertical direction.

14. The powertrain of any of claims 7-11, wherein, The inner walls of the two housings surround an envelope structure having a radial dimension gradually increasing from an end of the envelope structure close to the annular protrusion to another end of the envelope structure away from the annular protrusion, the envelope structure surrounding at least a part of an outer circumference of the annular protrusion, any of the strip protrusions being formed in an inner wall of the envelope structure.

15. The powertrain of claim 7, wherein, The annular protrusion comprises one notch for forming the lubricating oil passage, the one notch of the annular protrusion comprising one slot wall and another slot wall spaced apart in a counterclockwise direction, the one slot wall being spaced apart on one side of the one strip protrusion in a clockwise direction, and the another slot wall being spaced apart on another side of the one strip protrusion in a counterclockwise direction.

16. The powertrain of claim 15, wherein, The one strip groove is for communicating the one slot wall and a space between the one strip protrusion, and the other strip groove is for communicating the another slot wall and the space between the one strip protrusion.

17. The powertrain of claim 16, wherein, An extension line of the one strip protrusion along a length direction of the one strip protrusion penetrates the one notch of the annular protrusion centrally, and the one slot wall and the another slot wall have a same distance from the one strip protrusion.

18. The powertrain of any of claims 15-17, wherein, The annular protrusion further comprises another gap for flowing out lubricating oil in the bearing cavity, and a width of the another gap of the annular protrusion along a circumferential direction of the annular protrusion is less than the width of the one gap of the annular protrusion.

19. The powertrain of claim 1, wherein, The lubricating oil passage is used for connecting the bearing cavity of the output wheel, and an included angle of any one of the strip-shaped protrusions relative to a line connecting the bearing cavity of the output wheel and the bearing cavity of the input wheel in a counterclockwise direction is greater than 90 degrees and less than 180 degrees; or, the lubricating oil passage is used for connecting the bearing cavity of the input wheel, and an included angle of any one of the strip-shaped protrusions relative to a line connecting the bearing cavity of the input wheel and the bearing cavity of the output wheel in a clockwise direction is greater than 90 degrees and less than 180 degrees.

20. An electric vehicle, characterized by The electric vehicle comprises a wheel and the power assembly according to any one of claims 1-19.

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