Electric axle assembly for truck

Abstract

The name of the present invention is a truck electric axle assembly. It belongs to the field of automobile manufacturing technology. It mainly solves the problems of large transmission efficiency loss and large volume of various components in existing pure electric vehicles. Its main features are: including a middle motor and a left rear axle housing and reducer assembly and a right rear axle housing and reducer assembly at both ends; the left rear axle housing and reducer assembly include a left axle housing, a left wheel-side reducer assembly, a half shaft, a central reducer assembly and a differential assembly; the right rear axle housing and reducer assembly include a right wheel-side reducer assembly and a right axle housing; the left wheel-side reducer assembly and the right wheel-side reducer assembly are respectively installed at both ends of the bare axle assembly; the differential assembly and the central reducer assembly are integrated into a central reducer and differential assembly, which is installed inside the left axle housing near the motor side. The present invention has the characteristics of shortening the transmission chain to improve efficiency and reduce the energy consumption per unit load, and is mainly used for the electric axle assembly of pure electric trucks.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile manufacturing, and in particular relates to an electric axle assembly for a pure electric truck. Background Art

[0002] At present, the vast majority of pure electric vehicles use the power unit structure of traditional internal combustion engine vehicles, namely the motor, drive shaft, reducer / differential assembly; due to the long transmission chain, the transmission efficiency loss is large and the large size of each component will occupy part of the car's space, affecting the passenger capacity and battery layout space of the car, affecting the vehicle's cruising range. Summary of the invention

[0003] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide an electric axle assembly that integrates a drive motor and a traditional mechanical axle. This compact structural arrangement can shorten the transmission chain and improve efficiency, increase the passenger capacity of the car and increase the battery capacity of the car, thereby reducing the energy consumption per unit load.

[0004] The technical solution of the present invention is: a truck electric axle assembly, characterized in that it includes a middle motor and a left rear axle housing and a reducer assembly and a right rear axle housing and a reducer assembly at both ends; wherein the left rear axle housing and the reducer assembly include a left axle housing, a left wheel-side reducer assembly, a half shaft, a central reducer assembly and a differential assembly; the right rear axle housing and the reducer assembly include a right wheel-side reducer assembly and a right axle housing; the left wheel-side reducer assembly and the right wheel-side reducer assembly are respectively installed at both ends of the bare axle assembly; the differential assembly and the central reducer assembly are integrated into a central reducer and differential assembly, which is installed inside the left axle housing close to the motor side.

[0005] The central reducer and differential assembly described in the technical solution of the present invention includes a differential assembly including a left differential case, a right differential case, planetary gears, a half-shaft gear, a straight shaft, a first end face bearing, a second end face bearing, a needle bearing, and a first connecting bolt; includes a central reducer assembly including a right reducer case, a sun gear, a planetary gear, a first ball bearing, a hollow straight shaft, a second ball bearing, and a third ball bearing; the planetary gears, half-shaft gears, a straight shaft, a first end face bearing, a second end face bearing, and a needle bearing are installed inside the left differential case and the right differential case to form a differential assembly; the sun gear, planetary gears, a first ball bearing, a hollow straight shaft, a second ball bearing, and a third ball bearing are assembled inside the right reducer case to form a central reducer assembly; the central reducer assembly is connected to the differential assembly by a second connecting bolt.

[0006] The motor and the transmission chains of the left rear axle housing and the reducer assembly and the right rear axle housing and the reducer assembly at both ends described in the technical solution of the present invention are located on the same axis.

[0007] The needle bearing described in the technical solution of the present invention is installed in the planetary gear, the first end bearing is installed at both ends of the planetary gear, and the straight shaft installs the needle bearing, the planetary gear and the first end bearing in the middle of the left differential case and the right differential case; the half-shaft gears and the second end bearing are alternately installed inside the left differential case and the right differential case; the left differential case and the right differential case are fixedly connected by the first connecting bolt; the second ball bearing and the third ball bearing are pressed onto the right reducer case; the sun gear is pressed into the second ball bearing; the first ball bearing is pressed into the planetary gear, and the hollow straight shaft connects the first ball bearing to the right reducer case.

[0008] The technical solution of the present invention is provided with a hollow straight shaft positioning hole on the right housing of the differential, and the front end of the hollow straight shaft extends into the hollow straight shaft positioning hole; the right housing of the differential and the right housing of the reducer are provided with matching positioning pin holes, and positioning pins are installed in the positioning pin holes; the right housing of the differential (20) and the right housing of the reducer are fixedly connected by a second connecting bolt.

[0009] To achieve the above purpose, the present invention is based on the existing power transmission structure of pure electric vehicles, integrates the drive motor and the traditional mechanical axle into an electric axle assembly, eliminates the transmission shaft, and directly inputs the power to the wheel end through the half shaft; eliminates the bevel gear in the reducer, so that the power transmission is on the same axis. The present invention has the characteristics of shortening the transmission chain, improving efficiency and reducing the energy consumption per unit load, and is mainly used for the electric axle assembly of pure electric trucks. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the bare bridge assembly structure of the pure electric axle of the present invention.

[0011] Figure 2 It is a structural schematic diagram of the left rear axle housing and the reducer assembly of the present invention.

[0012] Figure 3 It is a structural schematic diagram of the right rear axle housing and the reducer assembly of the present invention.

[0013] Figure 4 It is a structural schematic diagram of the central reducer and differential assembly of the present invention.

[0014] Figure 5 yes Figure 4 Schematic diagram of the structure of the central reducer assembly.

[0015] Figure 6 yes Figure 4 Schematic diagram of the structure of the center differential assembly.

[0016] In the figure: 1-left rear axle housing and reducer assembly, 2-motor, 3-right rear axle housing and reducer assembly, 4-semi-axle, 5-left wheel side reducer assembly, 6-central reducer and differential assembly, 7-left axle housing, 8-right wheel side reducer assembly, 9-right axle housing, 10-differential assembly, 11-central reducer assembly, 12-reducer right housing, 13-sun gear, 14-planet gear, 15-first ball bearing, 16-hollow straight shaft, 17-second ball bearing, 18-third ball bearing; 19-differential left housing, 20-differential right housing, 21-semi-axle gear, 22-planet gear, 23-straight shaft, 24-first end face bearing, 25-needle bearing; 26-second end face bearing; 27-first connecting bolt; 28-second connecting bolt; 29-locating pin. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0018] like Figures 1 to 4 As shown. The electric axle assembly of a truck of the present invention includes a motor 2 in the middle and a left rear axle housing and reducer assembly 1 and a right rear axle housing and reducer assembly 3 at both ends. Among them, the left rear axle housing and reducer assembly 1 includes a left axle housing 7, a left wheel-side reducer assembly 5, a half shaft 4, a central reducer assembly 11 and a differential assembly 10. The right rear axle housing and reducer assembly 3 includes a right wheel-side reducer assembly 8 and a right axle housing 9. The left wheel-side reducer assembly 5 and the right wheel-side reducer assembly 8 are respectively installed at the two ends of the bare axle assembly. The differential assembly 10 and the central reducer assembly 11 are integrated into a central reducer and differential assembly 6, which is installed on the left axle housing 7) close to the motor 2 side. The motor 2 and the transmission chains of the left rear axle housing and reducer assembly 1 and the right rear axle housing and reducer assembly 3 at both ends are located on the same axis. The power of the motor 2 is directly input to the wheel ends on both sides through the central reducer and differential assembly 6, the half shaft 4, the left wheel side reducer assembly 5, and the right wheel side reducer assembly 8.

[0019] like Figure 5 , Figure 6 As shown. The central reducer assembly 11 of the central reducer and differential assembly 6 includes a reducer right housing 12, a sun gear 13, a planetary gear 14, a first ball bearing 15, a hollow straight shaft 16, a second ball bearing 17 and a third ball bearing 18. The sun gear 13, the planetary gear 14, the first ball bearing 15, the hollow straight shaft 16, the second ball bearing 17 and the third ball bearing 18 are assembled inside the reducer right housing 12 to form the central reducer assembly 11. The second ball bearing 17 and the third ball bearing 18 are press-fitted onto the reducer right housing 12, and the sun gear 13 is press-fitted into the second ball bearing 17. The first ball bearing 15 is press-fitted into the planetary gear 14, and the hollow straight shaft 16 connects the first ball bearing 15 to the reducer right housing 12.

[0020] The differential assembly 10 of the central speed reducer and differential assembly 6 comprises a differential left case 19, a differential right case 20, planetary gears 22, axle gears 21, a straight shaft 23, a first end bearing 24, a second end bearing 26, a needle bearing 25 and a first connecting bolt 27. The planetary gears 22, axle gears 21, a straight shaft 23, a first end bearing 24, a second end bearing 26, and a needle bearing 25 are installed inside the differential left case 19 and the differential right case 20 to form the differential assembly 10. The needle bearing 25 is installed in the planetary gear 22, the first end bearing 24 is installed at both ends of the planetary gear 22, and the straight shaft 23 installs the planetary gear assembly consisting of the needle bearing 25, the planetary gear 22 and the first end bearing 25 between the left differential case 19 and the right differential case 20. The half-shaft gears 21 and the second end bearing 26 are alternately installed inside the left differential case 19 and the right differential case 20. The left differential case 19 and the right differential case 20 are fixedly connected by the first connecting bolts 27 to form a complete differential assembly 10.

[0021] The axle gear 21 of the differential assembly 10 is matched with the sun gear 13 of the central reducer assembly 11. The right differential housing 20 is provided with a hollow straight shaft positioning hole, and the front end of the hollow straight shaft 16 extends into the hollow straight shaft positioning hole. The right differential housing 20 and the right reducer housing 12 are provided with matching positioning pin holes, and the positioning pin holes are equipped with positioning pins 29. The right differential housing 20 and the right reducer housing 12 are fixedly connected by the second connecting bolt 28. The differential assembly 10 and the central reducer assembly 11 form a central reducer and differential assembly 6 through the second connecting bolt 28 and the positioning pin 29.

[0022] The present invention integrates the functions of the motor, transmission shaft and traditional mechanical axle in the traditional pure electric vehicle drive unit, and replaces them in structure and function. The wheel-side reducers are directly installed at both ends of the bridge housing, the differential and the central reducer are integrated inside the bridge housing, and the motor is located between the two sections of the bridge housing. The power of the motor 2 is directly input to the wheel ends on both sides through the central reducer and differential assembly 6, the half shaft 4, and the wheel-side reducer.

Claims

1. A truck electric axle assembly, characterized in that: The invention comprises a motor (2) in the middle and a left rear axle housing and a reducer assembly (1) and a right rear axle housing and a reducer assembly (3) at both ends; wherein the left rear axle housing and a reducer assembly (1) comprises a left axle housing (7), a left wheel-side reducer assembly (5), a half shaft (4), a central reducer assembly (11) and a differential assembly (10); the right rear axle housing and a reducer assembly (3) comprises a right wheel-side reducer assembly (8) and a right axle housing (9); the left wheel-side reducer assembly (5) and the right wheel-side reducer assembly (8) are respectively installed at both ends of the bare axle assembly; the differential assembly (10) and The central reducer assembly (11) is integrated into a central reducer and differential assembly (6), which is installed inside the left axle housing (7) near the motor (2); the central reducer and differential assembly (6) includes a differential assembly (10) including a left differential housing (19), a right differential housing (20), planetary gears (22), half-axle gears (21), a straight shaft (23), a first end bearing (24), a second end bearing (26), a needle bearing (25), and a first connecting bolt (27); the central reducer assembly (11) includes a reducer right housing (12), a sun gear (1 3), a planetary gear (14), a first ball bearing (15), a hollow straight shaft (16), a second ball bearing, and a third ball bearing (18) are provided as a central reducer assembly (11); the planetary gear (22), the half-shaft gear (21), the straight shaft (23), the first end face bearing (24), the second end face bearing (26), and the needle bearing (25) are installed inside the left differential housing (19) and the right differential housing (20) to form a differential assembly (10); the sun gear (13), the planetary gear (14), the first ball bearing (15), the hollow straight shaft (16), the second ball bearing, and the third ball bearing (18) are provided as a central reducer assembly (11); the planetary gear (22), the half-shaft gear (21), the straight shaft (23), the first end face bearing (24), the second end face bearing (26), and the needle bearing (25) are installed inside the left differential housing (19) and the right differential housing (20) to form a differential assembly (10); the sun gear (13), the planetary gear (14), the first ball bearing (15), the hollow straight shaft (1 6), the second ball bearing and the third ball bearing (18) are assembled inside the right housing (12) of the reducer to form a central reducer assembly (11); the central reducer assembly (11) is connected to the differential assembly (10) by a second connecting bolt; the motor (2) and the transmission chains of the left rear axle housing and the reducer assembly (1) and the right rear axle housing and the reducer assembly (3) at both ends are located on the same axis; the right housing (20) of the differential is provided with a hollow straight shaft positioning hole, and the front end of the hollow straight shaft (16) extends into the hollow straight shaft positioning hole; the half-axle gear is a cylindrical gear.

2. The electric truck axle assembly according to claim 1, characterized in that: The needle bearing (25) is installed in the planetary gear (22), the first end bearing (24) is installed at both ends of the planetary gear (22), and the straight shaft (23) installs the needle bearing (25), the planetary gear (22) and the first end bearing (24) between the left differential housing (8) and the right differential housing (20); the half-shaft gear (21) and the second end bearing (26) are alternately installed inside the left differential housing and the right differential housing (20); the left differential housing (19) and the right differential housing (20) are fixedly connected by a first connecting bolt (27); the second ball bearing and the third ball bearing (18) are pressed onto the right housing (12) of the reducer; the sun gear (13) is pressed into the second ball bearing; the first ball bearing (15) is pressed into the planetary gear (14), and the hollow straight shaft (16) connects the first ball bearing (15) to the right housing (12) of the reducer.

3. The electric truck axle assembly according to claim 2, characterized in that: The right differential housing (20) and the right reducer housing (12) are provided with matching positioning pin holes, and positioning pins (29) are installed in the positioning pin holes; the right differential housing (20) and the right reducer housing (12) are fixedly connected by a second connecting bolt.

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