CN113757347B

CN113757347B - Speed reducer for electric automobile

Info

Publication number: CN113757347B
Application number: CN202110948439.7A
Authority: CN
Inventors: 虞邱健; 双波涛; 郑颖
Original assignee: Zhejiang Xiaxia Precision Manufacturing Co ltd
Current assignee: Zhejiang Xiaxia Precision Manufacturing Co ltd
Priority date: 2021-08-18
Filing date: 2021-08-18
Publication date: 2023-06-23
Anticipated expiration: 2041-08-18
Also published as: CN113757347A

Abstract

A speed reducer for an electric automobile comprises a shell and a transmission mechanism. The gear face that corresponds the transmission chamber in the casing encloses and is equipped with the casing runner, the casing runner is equipped with the oil outlet chamber in the top of gear engagement face, the oil outlet pump is installed to the oil outlet intracavity. The housing flow channel is provided with an inflow chamber below the gear surface side, the inflow chamber being used for mounting the filter element. The gear of the transmission mechanism is provided with an installation table, and the center of the installation table is provided with a shaft installation hole. The gear is provided with radial-distributed gear runners along the center of the shaft mounting hole. The mounting table is also provided with a drainage tube, so that lubricating oil can be drained to the bearing for lubrication. Compared with the prior art, the application has the following beneficial effects: when the vehicle runs under the limit working condition, the speed reducer can ensure that all gears and bearings in the speed reducer can be fully lubricated and infiltrated, and impurities in the lubricating oil can be filtered to ensure the cleanliness of the lubricating oil when the equipment runs.

Description

Speed reducer for electric automobile

Technical Field

The invention belongs to the technical field of electric automobiles, and particularly relates to a speed reducer for an electric automobile.

Background

An electric vehicle is a vehicle that runs on wheels driven by a motor using a vehicle-mounted power supply as power. The power system of the electric automobile generally adopts a mode of combining a motor and a speed reducer, and the speed reducer is used for realizing the speed increase and decrease of the power of the motor through a speed reduction gear assembly, so that the power performance and the economical efficiency requirements of the whole automobile are further realized.

The interior of the reduction gear typically needs to be lubricated by lubricating oil. In the prior art, a passive lubrication scheme is generally adopted in the electric vehicle speed reducer, namely, during running of the vehicle, lubricating oil in the speed reducer is required to be stirred through running of a speed reducer gear, so that the lubricating oil splashes, and lubrication and cooling of a speed reducer gear assembly in the speed reducer are realized. However, when the vehicle encounters a limit condition, such as a road condition of ascending, descending, left or right long-time curved road, the lubricating oil in the speed reducer is concentrated to one side in the speed reducer due to centrifugal force and gravity, so that the gear cannot stir enough lubricating oil, and the condition of insufficient lubrication of the gear and the bearing of the speed reducer occurs. If the consumption of the lubricating oil is increased, the cost is increased, the gear oil stirring resistance is increased, the running efficiency of the speed reducer is further reduced, and the whole vehicle endurance is reduced.

Accordingly, the present application has been further designed and developed based on some of the above prior art.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides the speed reducer for the electric automobile, which can ensure that all gears and bearings in the speed reducer can be fully lubricated and infiltrated when the automobile runs under the limit working condition, and can filter impurities in lubricating oil to ensure the cleanliness of the lubricating oil when equipment runs.

In order to solve the technical problems, the invention is solved by the following technical scheme.

The speed reducer for the electric automobile comprises a shell and a transmission mechanism, wherein a transmission cavity is formed in the shell, and the transmission mechanism is assembled in the transmission cavity. Wherein, the liquid crystal display device comprises a liquid crystal display device,

the gear face that corresponds the transmission chamber in the casing encloses and is equipped with the casing runner, the casing runner is equipped with the oil outlet chamber in the top of gear engagement face, the oil outlet pump is installed to the oil outlet intracavity. The shell runner is provided with an inflow cavity below the side of the gear surface, and the inflow cavity is used for installing a filter element; a plurality of first bearing cavities for installing bearings are arranged in the shell, and second bearing cavities are sleeved outside the first bearing cavities.

The gear of the transmission mechanism is provided with an installation table, and the center of the installation table is provided with a shaft installation hole. The gear is provided with radial-distributed gear runners along the center of the shaft mounting hole. One end of the gear runner is arranged on the mounting table, and the port faces the direction of the first bearing cavity on the side wall of the shell. The other end of the gear runner is arranged on the side face of the gear. The mounting table is also provided with a drainage tube, and the other end of the drainage tube is assembled in a second bearing cavity of the shell through a bearing, so that lubricating oil can be drained to the bearing for lubrication.

In a preferred embodiment, the transmission mechanism includes an input shaft, a drive shaft, and an output shaft. The input shaft is equipped with an input gear. The transmission shaft is provided with a first transmission gear and a second transmission gear. The output shaft is provided with an output gear. The input shaft, the transmission shaft and the output shaft are arranged in the first bearing cavity through bearings.

In a preferred embodiment, the input gear is meshed with a first transfer gear and the second transfer gear is meshed with an output gear.

In a preferred embodiment, the gear flow channels on the input gear and the output gear are T-shaped, and one end of the gear flow channel on the mounting table is a through hole, so that lubricating oil can flow out from two ends of the through hole. The gear flow channels of the first transmission gear and the second transmission gear are L-shaped, so that lubricating oil can flow out from one end in the direction towards the first bearing cavity.

In a preferred embodiment, the housing comprises a first shell, a middle shell and a second shell, and the first shell, the middle shell and the second shell are fixed through screw thread assembly. And the two sides of the middle shell are provided with middle flow cavities, and the first shell and the second shell are respectively provided with a corresponding first flow cavity and a corresponding second flow cavity corresponding to the middle flow cavities. The middle flow cavity, the first flow cavity and the second flow cavity are assembled to form a shell flow channel, so that the manufacturing difficulty is reduced.

In a preferred embodiment, the middle shell is provided with middle assembly grooves on two sides, sealing strips are assembled on the upper surfaces of the first flow cavity and the second flow cavity, sealing is achieved by assembling the sealing strips with the middle flow cavity, and sealing of the inside of the shell runner is guaranteed, and oil leakage is avoided.

In a preferred embodiment, the first and second shells are provided with respective first and second fitting grooves corresponding to the intermediate fitting groove, respectively; the middle assembly groove, the first assembly groove and the second assembly groove are assembled to form an inflow cavity, so that manufacturing difficulty is reduced.

In a preferred embodiment, a switch assembly is arranged in the second shell, and the switch assembly is connected with the oil outlet pump; the switch assembly comprises an arc-shaped groove, the two ends of the arc-shaped groove are provided with touch-through elements, and balls are slidably arranged in the arc-shaped groove, so that the oil pump works only when the vehicle runs under the limiting working condition, and energy conservation is facilitated.

In a preferred embodiment, a sealing ring is arranged on the filter element, so that oil leakage is avoided, and the filter element is convenient to replace.

In a preferred embodiment, the oil outlet pump is a gear pump, and the structure is simple and the operation is reliable.

Compared with the prior art, the application has the following beneficial effects: when the vehicle runs under the limit working condition, the speed reducer can ensure that all gears and bearings in the speed reducer can be fully lubricated and infiltrated, and impurities in the lubricating oil can be filtered to ensure the cleanliness of the lubricating oil when the equipment runs.

Drawings

Fig. 1 is a schematic perspective view of the present application.

Fig. 2 is a schematic perspective view of the second embodiment.

Fig. 3 is an exploded view of the present application.

Fig. 4 is a schematic perspective view of the first housing.

Fig. 5 is a perspective view of the first case assembled.

Fig. 6 is a schematic front view of the intermediate shell.

Fig. 7 is a reverse side perspective view of the intermediate shell.

Fig. 8 is a perspective view of the second case.

Fig. 9 is a perspective view of the second case assembled.

Fig. 10 is a perspective view of the transmission mechanism.

FIG. 11 is a schematic diagram of the cooperation of the transmission mechanism with the draft tube and the rolling bearing.

Fig. 12 is a cross-sectional view of the transmission mechanism.

FIG. 13 is a plan view distribution diagram of a draft tube and a rolling bearing.

Fig. 14 is a plan view of the gear flow path within the gear.

Fig. 15 is a perspective view of a filter element.

Fig. 16 is a plan cross-sectional view of the switch assembly.

The marks in the figure:

1-a housing; 11-a transmission cavity; 12-a housing flow passage; 121-an oil outlet cavity; 122-an oil outlet pump; 13-inflow lumen; 131-a filter; 132-a sealing ring; 14-a first bearing cavity; 141-rolling bearings; 15-a second bearing chamber; 151-sliding bearings; 16-sealing strips;

2-a first shell; 21-a first flow chamber; 22-first fitting groove.

3-an intermediate shell; 31-an intermediate flow chamber; 32-intermediate fitting groove.

4-a second shell; 41-a second flow chamber; 42-a second fitting groove; a 43-switch assembly; 431-arc groove; 432—a touch-through element; 433-ball.

5-a transmission mechanism; 51-mounting table; 511-shaft mounting holes; 52-gear flow path; 53-drainage tube.

6-an input shaft; 61-input gear.

7-a transmission shaft; 71-a first transmission gear; 72-second drive gear.

8-an output shaft; 81-output gear.

Description of the embodiments

The invention is described in further detail below with reference to the drawings and the detailed description.

In the following embodiments, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout, and the embodiments described below by referring to the drawings are exemplary only for explaining the present invention and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms: the directions of the center, the longitudinal, the lateral, the length, the width, the thickness, the upper, the lower, the front, the rear, the left, the right, the vertical, the horizontal, the top, the bottom, the inner, the outer, the clockwise, the counterclockwise, etc. indicate the directions or the positional relationship based on the directions or the positional relationship shown in the drawings, are merely for convenience of description and simplification of the description, and therefore, should not be construed as limiting the present invention. Furthermore, the term: first, second, etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of features shown. In the description of the present invention, unless explicitly specified and defined otherwise, the terms: mounting, connecting, etc. should be construed broadly and the specific meaning of the terms in the present application will be understood by those skilled in the art in view of the specific circumstances.

Referring to fig. 1 to 16.

The speed reducer for the electric automobile comprises a shell 1 and a transmission mechanism 5, wherein a transmission cavity 11 is formed in the shell 1, and the transmission mechanism 5 is assembled in the transmission cavity 11. Wherein, the liquid crystal display device comprises a liquid crystal display device,

the gear face that corresponds transmission chamber 11 in casing 1 encloses and is equipped with casing runner 12, casing runner 12 is equipped with out oil pocket 121 in the top of gear engagement face, go out oil pocket 121 and install out oil pump 122. The oil outlet pump 122 is a gear pump, and has a simple structure and reliable operation. The casing runner 12 is equipped with inflow cavity 13 in the side below of gear face, inflow cavity 13 is used for installing filter 131, be equipped with sealing washer 132 on the filter 131, filter 131 and inflow cavity 13 realize the assembly through screw-thread fit, guarantee can not leak oil, and make things convenient for the change of filter 131. A plurality of first bearing cavities 14 for installing rolling bearings 141 are arranged in the shell 1, and a second bearing cavity 15 is sleeved outside the first bearing cavities 14.

The gear of the transmission mechanism 5 is provided with a mounting table 51, and the center of the mounting table 51 is provided with a shaft mounting hole 511. The gear is provided with a radial distribution of gear runners 52 along the center of the shaft mounting hole 511. One end of the gear runner 52 is arranged on the mounting table 51, and the port faces the direction of the first bearing cavity 14 of the side wall of the shell 1. The other end of the gear flow path 52 is provided on the gear side. The mounting table 51 is also provided with a drainage tube 53, and the other end of the drainage tube 53 is assembled in the second bearing cavity 15 of the housing 1 through a sliding bearing 151.

In particular, the transmission mechanism 5 includes an input shaft 6, a transmission shaft 7, and an output shaft 8. The input shaft 6 is fitted with an input gear 61. The drive shaft 7 is fitted with a first drive gear 71 and a second drive gear 72. The output shaft 8 is fitted with an output gear 81. The input shaft 6, the drive shaft 7 and the output shaft 8 are mounted in a first bearing chamber 14 by means of rolling bearings 141. The input gear 61 is engaged with the first transmission gear 71, and the second transmission gear 72 is engaged with the output gear 81. The gear flow channels 52 on the input gear 61 and the output gear 81 are T-shaped, and one ends of the gear flow channels 52 on the mounting table 51 are through holes, so that lubricating oil can flow out from both ends of the through holes. The gear flow passages 52 of the first and second transmission gears 71 and 72 are L-shaped so that lubricating oil can flow out from one end in the direction toward the first bearing chamber 14.

Specifically, the housing 1 includes a first housing 2, an intermediate housing 3, and a second housing 4, and the first housing 2, the intermediate housing 3, and the second housing 4 are fixed by screw fitting. The two sides of the middle shell 3 are provided with middle flow cavities 31, and the first shell 2 and the second shell 4 are respectively provided with corresponding first flow cavities 21 and second flow cavities 41 corresponding to the middle flow cavities 31. The intermediate flow chamber 31, the first flow chamber 21 and the second flow chamber 41 are assembled to form the housing flow channel 12, which is beneficial to reducing the manufacturing difficulty. The upper surfaces of the first flow chamber 21 and the second flow chamber 41 are provided with sealing strips 16, and the sealing strips are assembled with the middle flow chamber 31 to realize sealing, so that the inner part of the shell flow channel 12 is sealed and oil leakage is avoided. The two sides of the middle shell 3 are provided with middle assembly grooves 32, and the first shell 2 and the second shell 4 are respectively provided with corresponding first assembly grooves 22 and second assembly grooves 42 corresponding to the middle assembly grooves 32; the middle assembly groove 32, the first assembly groove 22 and the second assembly groove 42 are assembled to form the inflow cavity 13, which is beneficial to reducing the manufacturing difficulty. The inflow chambers 13 are provided on both sides of the housing 1, respectively, and ensure smooth flow of the lubricating oil circuit in the housing 1 when the reduction gear is in an inclined state.

In this application, a switch assembly 43 is further disposed in the second shell 4, and the switch assembly 43 is connected to the oil outlet pump 122; the switch assembly 43 comprises an arc-shaped groove 431, two ends of the arc-shaped groove 431 are provided with a touch-through element 432, and the arc-shaped groove 431 is slidably provided with a ball 433, so that the oil pump 122 works only when the vehicle runs under a limit working condition, and energy conservation is facilitated. When the speed reducer is in an inclined state under a limiting working condition, the ball 433 rolls to any one of two ends of the arc-shaped groove 431, contacts the touch-through element 432, and the oil discharge pump 122 is started to start working, so that lubricating oil starts to circulate.

The scope of the present invention includes, but is not limited to, the above embodiments, and any alterations, modifications, and improvements made by those skilled in the art are intended to fall within the scope of the invention.

Claims

1. The speed reducer for the electric automobile comprises a shell (1) and a transmission mechanism (5), wherein a transmission cavity (11) is arranged in the shell (1), the transmission mechanism (5) is assembled in the transmission cavity (11), and is characterized in that,

a shell runner (12) is arranged in the shell (1) and corresponds to the gear surface of the transmission cavity (11), an oil outlet cavity (121) is arranged above the gear engagement surface of the shell runner (12), and an oil outlet pump (122) is arranged in the oil outlet cavity (121); the shell flow channel (12) is provided with an inflow cavity (13) below the side of the gear surface, and the inflow cavity (13) is used for installing a filter element (131); a plurality of first bearing cavities (14) for installing bearings are arranged in the shell (1), and second bearing cavities (15) are sleeved outside the first bearing cavities (14);

a mounting table (51) is arranged on a gear of the transmission mechanism (5), and a shaft mounting hole (511) is formed in the center of the mounting table (51); the gear is provided with radial-distributed gear runners (52) along the center of the shaft mounting hole (511), one end of each gear runner (52) is arranged on the mounting table (51), and the port faces the direction of the first bearing cavity (14) of the side wall of the shell (1); the other end of the gear runner (52) is arranged on the side surface of the gear; the mounting table (51) is also provided with a drainage tube (53), and the other end of the drainage tube (53) is assembled in the second bearing cavity (15) of the shell (1) through a bearing;

the shell (1) comprises a first shell (2), a middle shell (3) and a second shell (4), and the first shell (2), the middle shell (3) and the second shell (4) are assembled and fixed through threads; the two sides of the middle shell (3) are provided with middle flow cavities (31), and the first shell (2) and the second shell (4) are respectively provided with corresponding first flow cavities (21) and second flow cavities (41) corresponding to the middle flow cavities (31); the intermediate flow chamber (31) and the first and second flow chambers (21, 41) are assembled to form a housing flow channel (12).

2. A reducer for electric vehicles according to claim 1, characterized in that the transmission (5) comprises an input shaft (6), a transmission shaft (7) and an output shaft (8); the input shaft (6) is provided with an input gear (61); the transmission shaft (7) is provided with a first transmission gear (71) and a second transmission gear (72); an output gear (81) is assembled on the output shaft (8); the input shaft (6), the transmission shaft (7) and the output shaft (8) are arranged in the first bearing cavity (14) through bearings.

3. A reducer for electric vehicles according to claim 2, characterized in that said input gear (61) meshes with a first transmission gear (71), and said second transmission gear (72) meshes with an output gear (81).

4. A reducer for electric vehicles according to claim 3, wherein the gear flow path (52) of the input gear (61) and the output gear (81) is T-shaped, and one end of the gear flow path (52) on the mounting base (51) is a through hole; the gear flow channels (52) of the first transmission gear (71) and the second transmission gear (72) are L-shaped.

5. A reducer for electric vehicles according to claim 1, characterized in that the upper surfaces of the first flow chamber (21) and the second flow chamber (41) are equipped with sealing strips (16), which are assembled with the intermediate flow chamber (31) to realize sealing.

6. The reducer for electric vehicles according to claim 5, wherein the intermediate housing (3) is provided with intermediate assembly grooves (32) on both sides, and the first housing (2) and the second housing (4) are respectively provided with corresponding first assembly grooves (22) and second assembly grooves (42) corresponding to the intermediate assembly grooves (32); the intermediate fitting groove (32) and the first fitting groove (22) and the second fitting groove (42) are fitted to form an inflow chamber (13).

7. A reducer for electric vehicles according to claim 1, characterized in that a switch assembly (43) is provided in the second casing (4), the switch assembly (43) being connected to an oil outlet pump (122); the switch assembly (43) comprises an arc-shaped groove (431), two ends of the arc-shaped groove (431) are provided with a touch-through element (432), and the arc-shaped groove (431) is slidably provided with a ball (433).

8. The electric automobile speed reducer according to claim 1, wherein the filter (131) is provided with a sealing ring (132).

9. The electric vehicle retarder according to claim 1, wherein the oil outlet pump (122) is a gear pump.