A built-in coaxial reciprocating hub motor lubrication pump system

Abstract

A built-in coaxial reciprocating hub motor lubrication pump system in the technical field of hub motors includes a hub, a main shaft, a center positioning tube, a central ventilation tube, a piston guide column, a first one-way valve, a second fixed sleeve, a piston, a first fixed sleeve, a second oil channel, a third oil channel, a fourth oil channel, a fifth oil channel, a second cavity, a third cavity, a fourth cavity, a fifth cavity, and a second one-way valve. In the present invention, the piston of the lubrication pump is constrained by the piston guide column and moves in a circular motion along with the motor hub and the motor shaft; at the same time, it is constrained by the needle bearing on the first fixed sleeve, and the piston moves in an axial reciprocating motion. During the reciprocating motion of the piston, the two one-way valve groups are repeatedly opened and closed. The present invention integrates the lubrication system inside the rotating shaft of the motor, and by means of the rotation of the rotating shaft, the circumferential motion is converted into axial motion to achieve the suction and pumping of lubricating grease, thereby achieving the internal circulation of the lubricating grease.

Description

Technical Field

[0001] The present invention relates to a lubrication pump system in the technical field of hub motors, in particular to a built-in coaxial reciprocating hub motor lubrication pump system capable of realizing internal circulation of lubricating grease. Background Art

[0002] The wheel hub motor technology is also known as the in-wheel motor technology. Its biggest feature is that the power, transmission and braking devices are integrated into the wheel hub, thus greatly simplifying the mechanical part of the electric vehicle. The wheel hub motor technology is not a new thing. As early as 1900, electric vehicles equipped with wheel hub motors on the front wheels were manufactured. In the 1970s, this technology was applied in fields such as mining transport vehicles. As for the wheel hub motors used in passenger cars, Japanese manufacturers started the research and development of this technology earlier and are currently in a leading position. International auto giants including General Motors and Toyota have also been involved in this technology. For traditional vehicles, clutches, transmissions, drive shafts, differentials and even transfer cases are indispensable. These components are not only heavy and make the structure of the vehicle more complicated, but also require regular maintenance and have a high failure rate. However, the wheel hub motor solves this problem very well. In addition to a simpler structure, vehicles driven by wheel hub motors can achieve better space utilization and much higher transmission efficiency.

[0003] In the prior art, the hub motor lubrication pump is mainly used to ensure the lubrication of the mechanical components inside the motor, thereby extending its life and improving its operating efficiency. At present, the motor lubrication pump is basically external, large in size, occupies a lot of space, and also needs to consider pipe connection, lead wire, fixation, etc., with relatively many assembly points and high cost. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention proposes a built-in coaxial reciprocating hub motor lubrication pump system, which can integrate the lubrication system inside the motor rotating shaft, and convert the circumferential motion into axial motion by means of the rotation of the rotating shaft to achieve the suction and pumping of lubricating grease, thereby realizing the internal circulation of the lubricating grease.

[0005] The present invention is realized by the following technical scheme: the present invention comprises a wheel hub, a main shaft, a center positioning tube, a central ventilation tube, a piston guide column, a first one-way valve, a second fixed sleeve, a piston, a first fixed sleeve, a second oil passage, a third oil passage, a fourth oil passage, a fifth oil passage, a second cavity, a third cavity, a fourth cavity, a fifth cavity, and a second one-way valve; the left end of the main shaft is fixed with the wheel hub, the main shaft is a hollow structure, the center positioning tube is nested in the main shaft, and the central ventilation tube is nested in the center positioning tube; a second fixed sleeve circular hole channel is arranged on the center hole wall of the second fixed sleeve; the piston comprises a piston body, a piston guide column, a second fixed sleeve circular hole channel ... The piston fixing sleeve hole is arranged in the central part of the piston body, the piston valve hole is arranged on the piston body and is located on the outside of the piston fixing sleeve hole, and the piston guide hole is arranged on the piston body and is located on the outside of the piston valve hole; the first fixed sleeve includes a sleeve body, a bearing column, a needle bearing, and a first fixed sleeve center hole; the first fixed sleeve center hole is arranged in the central part of the sleeve body, the bearing column is arranged on the outer side wall of the sleeve body, and the needle bearing is nested on the bearing column; the left end of the piston guide column is fixed with the wheel hub, and the right end of the piston guide column is arranged in the piston guide hole; the center positioning tube is arranged in the first The center hole of the second fixed sleeve and the center hole of the first fixed sleeve pass through each other, the second fixed sleeve and the first fixed sleeve are both fixed together with the center positioning tube, and the second fixed sleeve is nested in the piston fixed sleeve hole; the first one-way valve is arranged on the piston valve hole, and the second one-way valve is arranged on the wheel hub; the inner wall surface of the center positioning tube and the outer wall surface of the central ventilation tube form a second oil passage, the third oil passage is arranged at the left end of the main shaft, and the fourth oil passage and the fifth oil passage are both arranged on the main shaft; the second cavity is arranged on the piston body, one end of the second cavity is connected to the first one-way valve, and the other end of the second cavity is connected to the second oil passage through the through hole on the second fixed sleeve The third cavity is formed between the left wall of the piston, the right wall of the wheel hub, the inner wall of the main shaft and the outer wall of the second fixed sleeve, and the third cavity is connected with the first one-way valve and the second one-way valve; the fifth cavity is formed between the right wall of the first fixed sleeve, the inner wall of the main shaft and the outer wall of the center positioning tube, and the fourth oil channel and the fifth oil channel are both connected with the fifth cavity; the fourth cavity is arranged on the wheel hub, one end of the fourth cavity is connected with the second one-way valve, and the other end of the fourth cavity is connected with the fifth cavity through the circular hole channel of the second fixed sleeve; a concave and convex surface is arranged on the outer edge of the right end surface of the piston body, and the concave and convex surface is in contact with the needle bearing.

[0006] Furthermore, in the present invention, the number of the piston guide columns is four, the number of the first one-way valves is two, and the number of the bearing columns and the number of the needle bearings are both four.

[0007] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention has a reasonable design and a simple process structure, and the lubrication system can be integrated inside the rotating shaft of the motor. By means of the rotation of the rotating shaft, the circumferential motion is converted into axial motion to achieve the suction and pumping of lubricating grease, thereby achieving the internal circulation of the lubricating grease. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 for Figure 1 A partial enlarged view of Figure 3 It is an exploded view of the parts of the present invention; Figure 4 It is an exploded view of components from another perspective of the present invention; Figure 5 for Figure 4 A partial enlarged view of Figure 6 is a cross-sectional view of an embodiment of the present invention; Figure 7 for Figure 6 A partial enlarged view of the upper part; Figure 8 for Figure 6 A partial enlarged view of the lower end; Fig. 9 It is a schematic diagram of the three-dimensional structure of an embodiment of the present invention; Fig.10 for Fig. 9 A partial enlarged view of the upper part; Fig.11 for Fig. 9 A partial enlarged view of the lower end; In the figure, 1, wheel hub, 2, main shaft, 3, center positioning tube, 4, central ventilation tube, 5, piston guide column, 6, first one-way valve, 7, second fixed sleeve, 8, piston, 9, first fixed sleeve, 10, second oil channel, 11, third oil channel, 12, fourth oil channel, 13, fifth oil channel, 14, second cavity, 15, third cavity, 16, fourth cavity, 17, fifth cavity, 18, second one-way valve, 19, motor housing, 20, water jacket, 21, left end cover of motor, 22, right end cover of motor, 23, stator assembly, 24, rotor assembly, 25, inner ring gear, 26, planetary primary reduction mechanism, 27 , planetary two-stage reduction mechanism, 28, first tapered roller bearing, 29, sixth cavity, 30, central air vent, 31, sixth oil channel, 32, eighth cavity, 33, resolver rotor support, 34, seventh cavity, 35, second tapered roller bearing, 36, air nozzle, 37, first cavity, 38, resolver rotor, 39, resolver stator, 40, wet clutch, 41, seventh oil channel, 42, first oil channel, 43, rotor support, 701, second fixed sleeve circular hole channel, 801, piston body, 802, piston guide hole, 803, piston valve hole, 804, piston fixed sleeve hole, 805, concave and convex surface. DETAILED DESCRIPTION

[0009] In order to make the contents of the present invention easier to understand, the technical solutions of the present invention are further explained below in combination with specific implementation methods. The examples are only used to illustrate the present invention, but the present invention is not limited to the contents. Example

[0010] like Figures 1 to 11As shown, the present invention includes a wheel hub 1, a main shaft 2, a center positioning tube 3, a central ventilation tube 4, a piston guide column 5, a first one-way valve 6, a second fixed sleeve 7, a piston 8, a first fixed sleeve 9, a second oil passage 10, a third oil passage 11, a fourth oil passage 12, a fifth oil passage 13, a second cavity 14, a third cavity 15, a fourth cavity 16, a fifth cavity 17, a second one-way valve 18, a motor housing 19, a water jacket 20, a motor left end cover 21, a motor right end cover 22, a stator assembly 23, a rotor assembly 24, an inner gear ring 25, a planetary primary reduction mechanism 26, a planetary secondary reduction mechanism 27, a first cone Roller bearing 28, sixth cavity 29, central air vent 30, sixth oil passage 31, eighth cavity 32, resolver rotor support 33, seventh cavity 34, second tapered roller bearing 35, air nozzle 36, first cavity 37, resolver rotor 38, resolver stator 39, wet clutch 40, seventh oil passage 41, first oil passage 42, rotor support 43; the left end of the main shaft 2 is fixed with the wheel hub 1, the main shaft 2 is a hollow structure, the center positioning tube 3 is nested in the main shaft 2, and the central air vent 4 is nested in the center positioning tube 3; the second fixed sleeve 7 is arranged with a second fixed sleeve circular hole on the center hole wall. The piston 8 comprises a piston body 801, a piston guide hole 802, a piston valve hole 803, and a piston fixed sleeve hole 804. The piston fixed sleeve hole 804 is arranged at the center of the piston body 801. The piston valve hole 803 is arranged on the piston body 801 and is located outside the piston fixed sleeve hole 804. The piston guide hole 802 is arranged on the piston body 801 and is located outside the piston valve hole 803. The first fixed sleeve 9 comprises a sleeve body 901, a bearing column 902, a needle bearing 903, and a first fixed sleeve center hole 904. The first fixed sleeve center hole 904 is arranged on the sleeve body. The center part of 901, the bearing column 902 is arranged on the outer wall of the sleeve body 901, and the needle bearing 903 is nested on the bearing column 902; the left end of the piston guide column 5 is fixed to the wheel hub 1, and the right end of the piston guide column 5 is arranged in the piston guide hole 802; the center positioning tube 3 passes through the center hole of the second fixed sleeve 7 and the center hole 904 of the first fixed sleeve, the second fixed sleeve 7 and the first fixed sleeve 9 are fixed to the center positioning tube 3, and the second fixed sleeve 7 is nested in the piston fixed sleeve hole 804; the first one-way valve 6 is arranged on the piston valve hole 803, and the second one-way valve 18 The second oil passage 10 is formed between the inner wall of the center positioning tube 3 and the outer wall of the central ventilation tube 4. The third oil passage 11 is arranged at the left end of the main shaft 2. The fourth oil passage 12 and the fifth oil passage 13 are arranged on the main shaft. The second cavity 14 is arranged on the piston body 801. One end of the second cavity 14 is connected to the first one-way valve 6. The other end of the second cavity 14 is connected to the second oil passage 10 through the through hole on the second fixed sleeve 7.A third cavity 15 is formed between the left wall of the piston 8, the right wall of the wheel hub 1, the inner wall of the main shaft 2, and the outer wall of the second fixed sleeve 7, and the third cavity 15 is connected to the first one-way valve 6 and the second one-way valve 18; a fifth cavity 17 is formed between the right wall of the first fixed sleeve 9, the inner wall of the main shaft 2, and the outer wall of the center positioning tube 3, and the fourth oil channel 12 and the fifth oil channel 13 are both connected to the fifth cavity 17; the fourth cavity 16 is arranged on the wheel hub 1, one end of the fourth cavity 16 is connected to the second one-way valve 18, and the other end of the fourth cavity 16 is connected to the fifth cavity 17 through the second fixed sleeve circular hole channel 701; a concave-convex surface 805 is arranged on the outer edge of the right end surface of the piston body 801, and the concave-convex surface 805 is in contact with the needle bearing 903. The number of piston guide columns 5 is four, the number of first one-way valves 6 is two, and the number of bearing columns 902 and needle bearings 903 are both four. ;

[0011] In the present invention, the motor housing 19 is fixed together with the motor left end cover 21 and the motor right end cover 22, and the water jacket 20 is arranged on the outside of the motor housing 19; the main shaft 2, the stator assembly 23, the rotor assembly 24, the inner gear ring 25, the planetary primary reduction mechanism 26, the planetary secondary reduction mechanism 27, the rotary rotor support 33, the rotary rotor 38, the rotary stator 39, the wet clutch 40, and the rotor support 43 are all arranged in the cavity surrounded by the motor housing 19, the motor left end cover 21, and the motor right end cover 22; the left end of the main shaft 2 is connected to the motor left end cover 21 through the first tapered roller bearing 28, and the right end of the main shaft 2 is connected to the motor left end cover 21 through the second tapered roller bearing 28. The bearing 35 is connected to the right end cover 22 of the motor; the central air vent 30 is arranged in the central air vent pipe 4, the air nozzle 36 is arranged at the right end of the central air vent pipe 4, the first oil channel 42 is arranged in the right end cover 22 of the motor, the sixth oil channel 31 is arranged on the left side wall of the wet clutch 40, the seventh oil channel 41 is arranged on the right side wall of the wet clutch 40, the first cavity 37 is arranged at the right end of the motor and is connected to the second oil channel 10, the sixth cavity 29 is arranged at the left end of the motor and is located on the outside of the main shaft 2, the eighth cavity 32 is arranged in the wet clutch 40, and the seventh cavity 34 is arranged in the forklift plate adapter plate inside the wet clutch 40.

[0012] In the implementation process of the present invention, the motor rotor support 43 is spline-connected with the primary sun gear of the planetary primary reduction mechanism 26, and after the planetary primary reduction and the planetary secondary reduction, the motor torque is transmitted to the wheel hub 1 through the spline connection between the gear rack of the planetary primary reduction mechanism 26 and the wheel hub 1. The piston 8 is sleeved on the second fixed sleeve 7, and is constrained by the piston guide column 5 and the needle bearing 902 on the first fixed sleeve 9. The piston 8 makes axial reciprocating motion on the second fixed sleeve 7. The flow path of the lubricating grease is as follows: grease at the bottom of the motor, the first oil channel 42, the first cavity 37, the second oil channel 10, the second cavity 14, the first one-way valve 6, the third cavity 15, the second one-way valve 18, the fourth cavity 16, the second fixed sleeve 7, the fifth cavity 17, the third, fourth and fifth oil channels, and the grease falls to the bottom of the motor driven by gravity.

[0013] The above description is only a preferred embodiment of the present invention. Any equivalent changes and modifications made by any technician familiar with the profession within the scope of the patent application of the present invention also belong to the scope covered by the claims attached to the present invention.

Claims

1. A built-in coaxial reciprocating hub motor lubrication pump system, comprising a hub (1) and a main shaft (2), characterized in that: It also includes a central positioning tube (3), a central ventilation tube (4), a piston guide column (5), a first one-way valve (6), a second fixed sleeve (7), a piston (8), a first fixed sleeve (9), a second oil passage (10), a third oil passage (11), a fourth oil passage (12), a fifth oil passage (13), a second cavity (14), a third cavity (15), a fourth cavity (16), a fifth cavity (17), and a second one-way valve (18); The left end of the main shaft (2) is fixed to the wheel hub (1); the main shaft (2) is a hollow structure; the central positioning tube (3) is nested in the main shaft (2); and the central ventilation tube (4) is nested in the central positioning tube (3); A second fixed sleeve circular hole channel (701) is arranged on the wall surface of the center hole of the second fixed sleeve (7); the piston (8) comprises a piston body (801), a piston guide hole (802), a piston valve hole (803), and a piston fixed sleeve hole (804); the piston fixed sleeve hole (804) is arranged at the center of the piston body (801); the piston valve hole (803) is arranged on the piston body (801) and is located outside the piston fixed sleeve hole (804); the piston guide hole (802) is arranged on the piston body (801) and is located outside the piston valve hole (803); the first fixed sleeve (9) The sleeve comprises a sleeve body (901), a bearing column (902), a needle bearing (903), and a first fixed sleeve center hole (904); the first fixed sleeve center hole (904) is arranged at the center of the sleeve body (901), the bearing column (902) is arranged on the outer side wall of the sleeve body (901), and the needle bearing (903) is nested on the bearing column (902); The left end of the piston guide column (5) is fixed to the wheel hub (1), and the right end of the piston guide column (5) is arranged in the piston guide hole (802); the center positioning tube (3) passes through the center hole of the second fixed sleeve (7) and the center hole (904) of the first fixed sleeve, the second fixed sleeve (7) and the first fixed sleeve (9) are fixed to the center positioning tube (3), and the second fixed sleeve (7) is nested in the piston fixed sleeve hole (804); the first one-way valve (6) is arranged on the piston valve hole (803), and the second one-way valve (18) is arranged on the wheel hub (1); The inner wall surface of the central positioning tube (3) and the outer wall surface of the central ventilation tube (4) form a second oil passage (10), the third oil passage (11) is arranged at the left end of the main shaft (2), and the fourth oil passage (12) and the fifth oil passage (13) are both arranged on the main shaft; The second cavity (14) is arranged on the piston body (801); one end of the second cavity (14) is connected to the first one-way valve (6); the other end of the second cavity (14) is connected to the second oil passage (10) through a through hole on the second fixed sleeve (7); a third cavity (15) is formed between the left wall surface of the piston (8), the right wall surface of the wheel hub (1), the inner wall surface of the main shaft (2), and the outer wall surface of the second fixed sleeve (7); the third cavity (15) is connected to the first one-way valve (6) and the second one-way valve (18). ); a fifth cavity (17) is formed between the right wall surface of the first fixed sleeve (9), the inner wall surface of the main shaft (2), and the outer wall surface of the center positioning tube (3); the fourth oil passage (12) and the fifth oil passage (13) are both connected to the fifth cavity (17); the fourth cavity (16) is arranged on the wheel hub (1); one end of the fourth cavity (16) is connected to the second one-way valve (18), and the other end of the fourth cavity (16) is connected to the fifth cavity (17) through the second fixed sleeve circular hole channel (701); A concave-convex surface (805) is arranged at the outer edge of the right end surface of the piston body (801), and the concave-convex surface (805) is in contact with the needle roller bearing (903).

2. The built-in coaxial reciprocating hub motor lubrication pump system according to claim 1 is characterized in that The number of the piston guide columns (5) is four, the number of the first one-way valves (6) is two, and the number of the bearing columns (902) and the number of the needle roller bearings (903) are both four.

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