Single-motor torque vector planet row speed reducer

Abstract

The invention discloses a single-motor torque vector planet row speed reducer which comprises a motor and speed reducer parts symmetrically arranged on the two sides of the motor. The speed reducer part comprises a speed reducer shell, a planetary gear transmission mechanism and a clutch, the planetary gear transmission mechanism comprises a first-stage driving sun gear, a duplex planet gear, a gear ring and a planet carrier, the output end of the motor is connected with the first-stage driving sun gear through a spline, and the first-stage driving sun gear is in meshing transmission with the duplex planet gear; the duplex planet wheel is in meshing transmission with the gear ring, the clutch is connected between the gear ring and the speed reducer shell, the duplex planet wheel is connected with the planet carrier through the planet gear pin, and finally torque is output to the wheel end. Vector control of the speed reducer is achieved through one motor, meanwhile, high integration is achieved, and the axial arrangement space is shortened.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric drive assembly of new energy vehicles, and specifically relates to a single-motor torque vector planetary gear reducer, which realizes reducer vector control through one motor. Background Art

[0002] As electric energy has the outstanding characteristics of large-scale centralized production, long-distance economic transmission, intelligent automatic control, etc., electric energy has become the main energy source for human production and activities. Relatively speaking, the application of electric drive devices is becoming more and more extensive. The electric motor is the power element of the electric drive device. It has a series of advantages such as high working efficiency, no pollution to the environment, low working noise, convenient use and control, reliable operation, low price, and solid structure. Therefore, it is widely used in industrial and agricultural production, transportation, national defense, commercial and household appliances, medical electrical equipment, etc.

[0003] Automobiles are developing rapidly towards new energy. The four major components of pure electric vehicles (drive motor, speed controller, power battery, and on-board charger) are the main differences from fuel vehicles. Because pure electric vehicles have high fuel conversion efficiency, easy automatic control, easy application of vehicle assisted driving, etc., the automotive industry regards pure electric vehicles as one of the future development directions and one of the main research directions of scientific researchers.

[0004] There are two types of pure electric vehicle drive forms: single motor centralized drive type and multi-motor decentralized drive type. Among them, multi-motor decentralized drive electric vehicles can be divided into the following types: motor and reducer combined drive type, wheel side motor drive type, and wheel hub motor direct drive type. The wheel side motor drive type has better performance than the other types. It is the main direction of pure electric vehicle development and one of the preferred drive methods for pure electric vehicles.

[0005] Regarding the drive motor, in most new energy vehicles, high-speed motors are mainly used. High-speed motors have the following main features: high energy density, small mass, and economical manufacturing materials. In actual application, high-speed motors are generally not used directly for driving, but a deceleration device needs to be added to achieve a better driving effect. This is mainly because the efficiency and torque of high-speed motors at high speeds are low and cannot meet normal driving requirements.

[0006] Highly integrated electric drive assembly can effectively save the space and mass occupied by the electric drive and improve the power density of the electric drive system. At present, parallel shaft reducers have large mass, large space occupancy rate, and high cost, which is not conducive to the development trend of lightweight new energy vehicles. Summary of the invention

[0007] In order to solve the above problems existing in the prior art, the present invention provides a single-motor torque vector planetary gear reducer, which realizes the vector control of the reducer through one motor, and is highly integrated and shortens the axial layout space.

[0008] The purpose of the present invention is achieved through the following technical solutions, in conjunction with the accompanying drawings:

[0009] A single-motor torque vector planetary gear reducer includes a motor and reducer parts symmetrically arranged on both sides of the motor; the reducer part includes a reducer housing 8, a planetary gear transmission mechanism and a clutch 13, the motor output end is connected to the planetary gear transmission mechanism, the planetary gear transmission mechanism is connected to the reducer housing 8 through the clutch 13, and the motor outputs torque to the wheel end 17 through the planetary gear transmission mechanism.

[0010] Furthermore, the planetary gear transmission mechanism includes a primary active sun gear 4, a double-coupled planetary gear, a ring gear 7, and a planet carrier 12. The motor output end is connected to the primary active sun gear 4 through a spline. The primary active sun gear 4 is meshed with the double-coupled planetary gear for transmission. The double-coupled planetary gear is meshed with the ring gear 7 for transmission. A clutch 13 is connected between the ring gear 7 and the reducer housing 8. The double-coupled planetary gear is connected to the planet carrier 12 through a planetary gear pin, and finally the torque is output to the wheel end 17.

[0011] Furthermore, the duplex planetary gear comprises a large tooth end 5 of the duplex planetary gear and a small tooth end 6 of the duplex planetary gear, the large tooth end 5 of the duplex planetary gear and the small tooth end 6 of the duplex planetary gear are coaxially arranged and fixed to each other for integral rotation; the primary active sun gear 4 is meshed with the large tooth end 5 of the duplex planetary gear, there is no mutual movement between the large tooth end 5 of the duplex planetary gear and the small tooth end 6 of the duplex planetary gear, and the small tooth end 6 of the duplex planetary gear is meshed with the ring gear 7.

[0012] In this embodiment, the large tooth end 5 of the duplex planetary gear and the small tooth end 6 of the duplex planetary gear are an integral structure.

[0013] Furthermore, the ring gear 7 controls the engagement degree of the clutch 13 through the clutch control unit 14 .

[0014] Furthermore, the double planetary gear is connected to the planetary gear pin via a needle bearing 15 , and the planetary gear pin is fixedly connected to the planetary carrier 12 , and the torque is output via the planetary carrier 12 , and finally the torque is output to the wheel end 17 .

[0015] Furthermore, the planetary gear transmission mechanism includes three double-coupled planetary gears, and the included angle between the planetary gear axes of adjacent double-coupled planetary gears is 120°.

[0016] Furthermore, the reducer part also includes a reducer side cover 9, and the reducer side cover 9 is connected to the reducer housing 8 by bolts.

[0017] Furthermore, a planetary carrier and reducer side cover support bearing 16 is provided between the planetary carrier 12 and the reducer side cover 9 ; a planetary carrier and reducer support bearing 11 is provided between the planetary carrier 12 and the reducer housing 8 .

[0018] Furthermore, the motor includes a motor housing 1, a motor stator 2 and a motor rotor shaft 3. The motor housing 1 is integrated with the reducer housing 8 and connected by bolts to compress the axial space. The motor stator 2 and the motor rotor shaft 3 constitute the motor body. The motor rotor shaft 3 is the output end of the motor. The motor rotor shaft 3 is connected to the primary active sun gear 4 of the planetary gear transmission mechanism through a spline.

[0019] Furthermore, a rotor shaft and reducer housing support bearing 10 is provided between the motor output end and the reducer housing 8 .

[0020] The present invention has the following advantages:

[0021] The present invention is a single-motor torque vector reducer, which realizes the vector control of the reducer through one motor;

[0022] The torque vector reducer of the present invention is a planetary gear reducer, which shortens the axial arrangement space;

[0023] The ring gear and the housing of the planetary gear transmission mechanism of the present invention are connected via a clutch;

[0024] The planetary gear transmission mechanism of the present invention controls the clutch engagement through the clutch control unit, thereby controlling the output speed to achieve speed regulation and turning differential;

[0025] The motor housing of the present invention is integrated with the transmission housing, shortening the axial space;

[0026] The planetary gear reducer adopted in the present invention has a more compact structure, fewer parts, lower overall weight, lower processing difficulty and reduced costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings used in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0028] Figure 1 This is a schematic diagram of the structure of a single-motor torque vectoring planetary gear reducer according to an embodiment of the present invention;

[0029] Figure 2 A schematic diagram of a single-motor torque vectoring planetary gear reducer with the same speed output on both sides of the wheel ends according to an embodiment of the present invention;

[0030] Figure 3 A schematic diagram of different speeds output by the planet carriers on both sides of a single-motor torque vectoring planetary gear reducer according to an embodiment of the present invention;

[0031] In the figure:

[0032] 1- Motor housing;

[0033] 2-Motor stator;

[0034] 3-motor rotor shaft;

[0035] 4-First-stage active sun gear;

[0036] 5-big tooth end of double planetary gear;

[0037] 6-Double planetary gear small tooth end;

[0038] 7-gear ring;

[0039] 8- reducer housing;

[0040] 9- reducer side cover;

[0041] 10- rotor shaft and reducer housing support bearing;

[0042] 11-Planet carrier and reducer support bearing;

[0043] 12-Planet carrier;

[0044] 13- Clutch;

[0045] 14- Clutch control unit;

[0046] 15-Planetary gear pin and needle roller bearing;

[0047] 16-Planet carrier and reducer side cover support bearing;

[0048] 17-Wheel end output. DETAILED DESCRIPTION

[0049] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0050] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0052] In the description of this embodiment, terms such as "up", "down", "left", and "right" and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0053] Example 1

[0054] like Figure 1 As shown, this embodiment is a single-motor torque vector planetary gear reducer, including a motor and a reducer part symmetrically arranged on both sides of the motor; the reducer part includes a reducer housing 8, a planetary gear transmission mechanism and a clutch 13, the output end of the motor is connected to the planetary gear transmission mechanism, the planetary gear transmission mechanism is connected to the reducer housing 8 through the clutch 13, and the motor outputs the torque to the wheel end 17 through the planetary gear transmission mechanism.

[0055] Furthermore, the planetary gear transmission mechanism includes a primary active sun gear 4, a double-coupled planetary gear, a ring gear 7, and a planet carrier 12. The motor output end is connected to the primary active sun gear 4 through a spline. The primary active sun gear 4 is meshed with the double-coupled planetary gear for transmission. The double-coupled planetary gear is meshed with the ring gear 7 for transmission. A clutch 13 is connected between the ring gear 7 and the reducer housing 8. The double-coupled planetary gear is connected to the planet carrier 12 through a planetary gear pin, and finally the torque is output to the wheel end 17.

[0056] Furthermore, the duplex planetary gear comprises a large tooth end 5 of the duplex planetary gear and a small tooth end 6 of the duplex planetary gear, the large tooth end 5 of the duplex planetary gear and the small tooth end 6 of the duplex planetary gear are coaxially arranged and fixed to each other for integral rotation; the primary active sun gear 4 is meshed with the large tooth end 5 of the duplex planetary gear, there is no mutual movement between the large tooth end 5 of the duplex planetary gear and the small tooth end 6 of the duplex planetary gear, and the small tooth end 6 of the duplex planetary gear is meshed with the ring gear 7.

[0057] In this embodiment, the large tooth end 5 of the duplex planetary gear and the small tooth end 6 of the duplex planetary gear are an integral structure.

[0058] Furthermore, the ring gear 7 controls the engagement degree of the clutch 13 through the clutch control unit 14 .

[0059] Furthermore, the double planetary gear is connected to the planetary gear pin via a needle bearing 15 , and the planetary gear pin is fixedly connected to the planetary carrier 12 , and the torque is output via the planetary carrier 12 , and finally the torque is output to the wheel end 17 .

[0060] Furthermore, the planetary gear transmission mechanism includes three double-coupled planetary gears, and the included angle between the planetary gear axes of adjacent double-coupled planetary gears is 120°.

[0061] Furthermore, the reducer part also includes a reducer side cover 9, and the reducer side cover 9 is connected to the reducer housing 8 by bolts.

[0062] Furthermore, a planetary carrier and reducer side cover support bearing 16 is provided between the planetary carrier 12 and the reducer side cover 9 ; a planetary carrier and reducer support bearing 11 is provided between the planetary carrier 12 and the reducer housing 8 .

[0063] Furthermore, the motor includes a motor housing 1, a motor stator 2 and a motor rotor shaft 3. The motor housing 1 is integrated with the reducer housing 8 and connected by bolts to compress the axial space. The motor stator 2 and the motor rotor shaft 3 constitute the motor body. The motor rotor shaft 3 is the output end of the motor. The motor rotor shaft 3 is connected to the primary active sun gear 4 of the planetary gear transmission mechanism through a spline.

[0064] Furthermore, a rotor shaft and reducer housing support bearing 10 is provided between the motor output end and the reducer housing 8 .

[0065] The working principle of this embodiment is briefly described below:

[0066] This embodiment is a single-motor torque vector planetary gear reducer. The reducer parts on both sides of the motor are arranged symmetrically. The motor stator 2 and the motor rotor shaft 3 work to transmit the input torque to the primary active sun gear 4. The primary active sun gear 4 meshes with the large tooth end 5 of the double-linked planetary gear to transmit the torque to the double-linked planetary gear. The large and small gears of the double-linked planetary gear are integrated and there is no mutual movement. The small tooth end 6 of the double-linked gear meshes with the ring gear 7 to transmit the torque to the ring gear; the ring gear can control the engagement degree of the clutch 13 through the clutch control unit 14 to control the torque output and control the output speed:

[0067] When the left and right clutches are fully engaged, the same speed output can be achieved on both sides of the wheel end. Figure 2 , where S is the sun gear input speed, C is the ring gear speed, and P is the planet carrier output speed;

[0068] When the left and right clutches are engaged to different degrees, a speed difference is formed on both sides, which can achieve different speed outputs on both sides of the wheel end. Figure 3 The output speed P of the planet carriers on both sides is different, and the torque is output through the planet carrier 12, and finally the torque is output to the wheel end 17.

[0069] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A single motor torque vectoring planetary gear reducer, characterized in that: The invention comprises a motor and a reducer part symmetrically arranged on both sides of the motor; the reducer part comprises a reducer housing (8), a planetary gear transmission mechanism and a clutch (13); the output end of the motor is connected to the planetary gear transmission mechanism, the planetary gear transmission mechanism is connected to the reducer housing (8) through the clutch (13), and the motor outputs torque to the wheel end (17) through the planetary gear transmission mechanism.

2. A single motor torque vectoring planetary gear reducer as claimed in claim 1, characterized in that: The planetary gear transmission mechanism comprises a primary active sun gear (4), a double-coupled planetary gear, a ring gear (7), and a planet carrier (12); the motor output end is connected to the primary active sun gear (4) via a spline; the primary active sun gear (4) is meshed with the double-coupled planetary gear for transmission; the double-coupled planetary gear is meshed with the ring gear (7) for transmission; a clutch (13) is connected between the ring gear (7) and the reducer housing (8); the double-coupled planetary gear is connected to the planet carrier (12) via a planetary gear pin, and finally the torque is output to the wheel end (17).

3. A single motor torque vectoring planetary gear reducer as claimed in claim 2, characterized in that: The double planetary gear comprises a double planetary gear large tooth end (5) and a double planetary gear small tooth end (6), the double planetary gear large tooth end (5) and the double planetary gear small tooth end (6) are coaxially arranged and form an integral structure; the first-stage active sun gear (4) meshes with the double planetary gear large tooth end (5), and the double planetary gear small tooth end (6) meshes with the gear ring (7).

4. A single motor torque vectoring planetary gear reducer as claimed in claim 2, characterized in that: The ring gear (7) controls the engagement degree of the clutch (13) through a clutch control unit (14).

5. A single motor torque vectoring planetary gear reducer as claimed in claim 2, characterized in that: The double planetary gear is connected to the planetary gear pin via a needle bearing, the planetary gear pin is fixedly connected to the planetary carrier (12), and the torque is output via the planetary carrier (12), and finally the torque is output to the wheel end (17).

6. A single motor torque vectoring planetary gear reducer as claimed in claim 2, characterized in that: The planetary gear transmission mechanism includes three double-coupled planetary gears, and the included angle between the planetary gear axes of adjacent double-coupled planetary gears is 120°.

7. A single motor torque vectoring planetary gear reducer as claimed in claim 2, characterized in that: The reducer part also includes a reducer side cover (9), and the reducer side cover (9) is connected to the reducer housing (8) by bolts.

8. A single motor torque vectoring planetary gear reducer as claimed in claim 2, characterized in that: A planet carrier and reducer side cover support bearing (16) is provided between the planet carrier (12) and the reducer side cover (9); and a planet carrier and reducer support bearing 11 is provided between the planet carrier (12) and the reducer housing (8).

9. The single motor torque vectoring planetary gear reducer according to claim 1, characterized in that: The motor comprises a motor housing (1), a motor stator (2) and a motor rotor shaft (3); the motor housing (1) is integrated with a reducer housing (8); the motor stator (2) and the motor rotor shaft (3) constitute a motor body; the motor rotor shaft (3) is an output end of the motor; and the motor rotor shaft (3) is connected to the planetary gear transmission mechanism.

10. A single motor torque vectoring planetary gear reducer as claimed in claim 9, characterized in that: A rotor shaft and reducer housing support bearing (10) is provided between the motor rotor shaft (3) and the reducer housing (8).

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