Hub motor with combined brake mechanism

Abstract

The invention relates to a hub motor with a combined brake mechanism in the technical field of motors. Comprising a motor shell, a water jacket, a motor left end cover, a motor right end cover, a hub, a main shaft, a sealing plug, a motor stator assembly, a motor rotor assembly, a rotor support, an inner gear ring, a planetary primary speed reducing mechanism, a planetary secondary speed reducing mechanism, a first tapered roller bearing, a second tapered roller bearing, a wet clutch, a rotary transformer rotor support, a rotary transformer rotor and a rotary transformer stator. The device comprises a first angular contact bearing, a second angular contact bearing, a third angular contact bearing, a thrust guide plate, a middle push plate, an end taper plate, a brake pad adapter plate, a parking brake device and a service brake device. The combined large hub motor braking mechanism is adopted, namely, air pressure type service braking and multi-disc spring series-parallel connection type parking braking are combined, the brake and the transmission device are both arranged in the hub motor, the integration degree is high, and the design is exquisite.

Description

Technical Field

[0001] The present invention relates to a wheel hub motor in the technical field of motors, in particular to a wheel hub motor with a combined brake mechanism which adopts a pneumatic service brake + a multi-disc spring serial-parallel parking brake. 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, wheel hub motors have been widely used in automobiles. The wheel hub motor braking system is a series of devices that can force the car to slow down. Its main function is to slow down or even stop the moving car, keep the speed of the downhill car stable, and keep the stopped car still. According to the braking requirements, it can be divided into a service brake system and a parking brake system. However, the existing wheel hub motor service brake system and parking brake system often adopt a structure that is not only complex in structure, but also has the possibility of failure under special working conditions. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention proposes a wheel hub motor with a combined braking mechanism, which adopts a pneumatic service brake + a multi-disc spring series-parallel parking brake. The brake and the transmission device are both arranged inside the wheel hub motor, with high integration and sophisticated design.

[0005] The present invention is realized by the following technical scheme: the present invention comprises a motor housing, a water jacket, a motor left end cover, a motor right end cover, a wheel hub, a main shaft, a sealing plug, a motor stator assembly, a motor rotor assembly, a rotor support, an inner gear ring, a planetary primary reduction mechanism, a planetary secondary reduction mechanism, a first tapered roller bearing, a second tapered roller bearing, a wet clutch, a resolver rotor support, a resolver rotor, a resolver stator, a first angular contact bearing, a second angular contact bearing, a third angular contact bearing, a thrust guide plate, an intermediate thrust plate, an end taper plate, a brake pad adapter plate, a parking brake device, and a service brake device; the water jacket 2 is arranged on the outside of the motor housing, the motor left end cover and the motor right end cover are respectively arranged on the left and right ends of the motor housing and are fixed together; the left end of the main shaft and the wheel hub The left end of the main shaft is connected to the left end cover of the motor through the first tapered roller bearing, and the right end of the main shaft is connected to the right end cover of the motor through the second tapered roller bearing. The sealing plug is arranged at the right end of the main shaft and is fixed to the right end cover of the motor; the motor stator assembly, the motor rotor assembly, the rotor support, the inner gear ring, the planetary first-stage reduction mechanism, the planetary second-stage reduction mechanism, the wet clutch, the resolver rotor support, the resolver rotor, the resolver stator, the first angular contact bearing, the second angular contact bearing, the third angular contact bearing, the thrust guide plate, the intermediate push plate, the end taper plate, and the brake pad adapter plate are all arranged in the cavity surrounded by the motor housing, the left end cover of the motor, and the right end cover of the motor; the inner side of the rotor support is connected to the main shaft through the first angular contact bearing, The motor rotor assembly is arranged on the rotor support, and the motor stator assembly is arranged on the inner wall of the motor housing and is located on the outside of the motor rotor assembly; the inner side of the inner gear ring is connected to the main shaft, the planetary first-stage reduction mechanism and the planetary second-stage reduction mechanism are both arranged on the inner gear ring, and the planetary second-stage reduction mechanism is located on the left side of the planetary first-stage reduction mechanism; the inner side of the resolver rotor support is connected to the main shaft through the second angular contact bearing, the resolver rotor is arranged on the resolver rotor support, and the resolver stator is arranged on the right end cover of the motor and matches the resolver rotor; the brake pad adapter plate is connected to the main shaft, the brake pad adapter plate is located between the first angular contact bearing and the second angular contact bearing, the wet clutch and the end taper plate are both arranged on the outside of the brake pad adapter plate, and the end taper plate is located at the wet The right side of the clutch; the thrust guide plate and the intermediate push plate are arranged on the outside of the main shaft, the third angular contact bearing is arranged between the thrust guide plate and the intermediate push plate, and the thrust guide plate is located on the right side of the second angular contact bearing; the parking brake device is arranged on the right end cover of the motor, and the parking brake device includes a parking brake nut, a parking brake piston, a parking brake disc spring, a parking brake decompression air chamber, and a parking brake decompression air inlet and outlet; the parking brake nut is fixed to the right end cover of the motor, there is a cavity on the left side of the parking brake nut, the parking brake disc spring is arranged in the cavity on the left side of the parking brake nut, the right end of the parking brake piston is arranged in the cavity on the left side of the parking brake nut and is located on the left side of the parking brake disc spring, and the left end of the parking brake piston passes through the right end cover of the motor and matches with the intermediate push plate;The parking brake decompression air chamber is formed between the left end face of the parking brake piston and the right end cover of the motor, and the parking brake decompression air inlet and outlet are arranged in the parking brake decompression air chamber; the service brake device is arranged on the right end cover of the motor, and the service brake device includes a service brake nut, a service brake piston, a service brake high-pressure air chamber, and a service brake high-pressure air inlet and outlet; the service brake nut is fixed together with the right end cover of the motor, and there is a cavity on the left side of the service brake nut. The right end of the service brake piston is arranged in the cavity on the left side of the service brake nut. The left end of the service brake piston passes through the right end cover of the motor and matches with the middle push plate; the service brake high-pressure air chamber is formed between the right end face of the service brake piston and the service brake nut and the right end cover of the motor, and the service brake high-pressure air inlet and outlet are arranged in the service brake high-pressure air chamber. ;

[0006] Furthermore, in the present invention, the main shaft is a hollow structure, and the cross-sectional area of ​​the left end thereof is larger than the cross-sectional area of ​​the right end thereof.

[0007] Furthermore, in the present invention, the parking brake piston is a mountain-shaped structure, and the service brake piston is a fork-shaped structure.

[0008] Furthermore, in the present invention, there are two parking brake devices and two service brake devices, which are arranged crosswise and symmetrically.

[0009] In the present invention, the service brake has a unique component: high-pressure gas enters the service brake high-pressure air chamber, and the air pressure pushes the service brake piston to move left, and the service brake piston pushes the middle push plate to achieve driving deceleration or braking. The parking brake has a unique component: high-pressure gas enters the parking brake decompression air chamber, pushing the parking brake piston, and there is a tendency to move right. When the air pressure driving force is greater than the elastic force of the parking brake disc spring, the parking brake piston moves right and the parking brake is released; when the air pressure driving force is less than the elastic force of the parking brake disc spring, the parking brake piston moves left, and the parking brake piston pushes the middle push plate to achieve parking braking. Common components: the middle push plate moves left under the drive of the service brake piston or the parking brake piston, and pushes the thrust guide plate through the angular contact ball bearing. The thrust guide plate pushes the end taper plate through a circle of cylindrical feet, and the end taper plate squeezes the wet clutch assembly to achieve deceleration or braking.

[0010] Compared with the prior art, the beneficial effects of the present invention are: the present invention has reasonable design, simple process structure, adopts pneumatic service brake + multi-disc spring series-parallel parking brake, the brake and transmission device are arranged inside the hub motor, and the integration is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a structural schematic diagram of a parking brake device included in an embodiment of the present invention; Figure 2 for Figure 1 A partial enlarged view of Figure 3for Figure 1 A partial enlarged view of the upper part; Figure 4 for Figure 1 A partial enlarged view of the lower end; Figure 5 A schematic diagram of the structure of a service brake device in an embodiment of the present invention; Figure 6 for Figure 5 A partial enlarged view of Figure 7 for Figure 5 A partial enlarged view of the upper part; Figure 8 for Figure 5 A partial enlarged view of the lower end; Fig. 9 An exploded view of parts of an embodiment of the present invention; Fig.10 is a three-dimensional structural diagram of an embodiment of the present invention; Fig.11 for Fig.10 A partial enlarged view of the upper part; Fig.12 for Fig.10 A partial enlarged view of the lower end; In the figure, 1, motor housing, 2, water jacket, 3, motor left end cover, 4, motor right end cover, 5, wheel hub, 6, main shaft, 7, sealing plug, 8, motor stator assembly, 9, motor rotor assembly, 10, rotor support, 11, inner ring gear, 12, planetary primary reduction mechanism, 13, planetary secondary reduction mechanism, 14, first tapered roller bearing, 15, second tapered roller bearing, 16, wet clutch, 17, resolver rotor support, 18, resolver rotor, 19, resolver stator, 20, first angular contact bearing, 21, second angular contact bearing, 22 , the third angular contact bearing, 23, thrust guide plate, 24, intermediate push plate, 25, end taper plate, 26, brake pad adapter plate, 27, parking brake device, 28, service brake device 28, 2701, parking brake nut, 2702, parking brake piston, 2703, parking brake disc spring, 2704, parking brake decompression air chamber, 2705, parking brake decompression air inlet and outlet, 2801, service brake nut, 2802, service brake piston, 2803, service brake high-pressure air chamber, 2804, service brake high-pressure air inlet and outlet. DETAILED DESCRIPTION

[0012] 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

[0013] like Figures 1 to 12 As shown, the present invention includes a motor housing 1, a water jacket 2, a motor left end cover 3, a motor right end cover 4, a wheel hub 5, a main shaft 6, a sealing plug 7, a motor stator assembly 8, a motor rotor assembly 9, a rotor support 10, an inner gear ring 11, a planetary primary reduction mechanism 12, a planetary secondary reduction mechanism 13, a first tapered roller bearing 14, a second tapered roller bearing 15, a wet clutch 16, a resolver rotor support 17, a resolver rotor 18, a resolver stator 19, a first angular contact bearing 20, a second angular contact bearing 21, a third angular contact bearing 22, a thrust guide plate 23, an intermediate thrust plate 24, an end taper plate 25, a brake pad adapter plate 26, a parking brake device 27, and a service brake device 28; the water jacket 2 is arranged on the outside of the motor housing 1 On the side, the left end cover 3 of the motor and the right end cover 4 of the motor are arranged at the left and right ends of the motor housing 1 and are fixed together; the left end of the main shaft 6 is fixed together with the wheel hub 5, the left end of the main shaft 6 is connected to the left end cover 3 of the motor through the first tapered roller bearing 14, the right end of the main shaft 6 is connected to the right end cover 4 of the motor through the second tapered roller bearing 15, the sealing plug 7 is arranged at the right end of the main shaft 6 and fixed together with the right end cover 4 of the motor; the motor stator assembly 8, the motor rotor assembly 9, the rotor support 10, the inner gear ring 11, the planetary primary reduction mechanism 12, the planetary secondary reduction mechanism 13, the wet clutch 16, the resolver rotor support 17, the resolver rotor 18, the resolver stator 19, the first angular contact bearing 20, the second angular contact bearing 21 , the third angular contact bearing 22, the thrust guide plate 23, the intermediate thrust plate 24, the end taper plate 25, and the brake pad adapter plate 26 are all arranged in the cavity surrounded by the motor housing 1, the motor left end cover 3, and the motor right end cover 4; the inner side of the rotor support 10 is connected to the main shaft 6 through the first angular contact bearing 20, the motor rotor assembly 9 is arranged on the rotor support 10, and the motor stator assembly 8 is arranged on the inner wall of the motor housing 1 and is located on the outside of the motor rotor assembly 9; the inner side of the inner gear ring 11 is connected to the main shaft 6, the planetary primary reduction mechanism 12 and the planetary secondary reduction mechanism 13 are both arranged on the inner gear ring 11, and the planetary secondary reduction mechanism 13 is located on the left side of the planetary primary reduction mechanism 12; the inner side of the rotary rotor support 17 is connected to the main shaft 6 through the first angular contact bearing 20, the motor rotor assembly 9 is arranged on the rotor support 10, and the motor stator assembly 8 is arranged on the inner wall of the motor housing 1 and is located on the outside of the motor rotor assembly 9; the inner side of the inner gear ring 11 is connected to the main shaft 6, the planetary primary reduction mechanism 12 and the planetary secondary reduction mechanism 13 are both arranged on the inner gear ring 11, and the planetary secondary reduction mechanism 13 is located on the left side of the planetary primary reduction mechanism 12 The first angular contact bearing 20 and the second angular contact bearing 21 are connected to the main shaft 6, the resolver rotor 18 is arranged on the resolver rotor support 17, and the resolver stator 19 is arranged on the right end cover 4 of the motor and matches the resolver rotor 18; the brake pad adapter plate 26 is connected to the main shaft 6, and the brake pad adapter plate 26 is located between the first angular contact bearing 20 and the second angular contact bearing 21. The wet clutch 1 and the end taper plate 25 are arranged on the outside of the brake pad adapter plate 26, and the end taper plate 25 is located on the right side of the wet clutch 16; the thrust guide plate 23 and the intermediate push plate 24 are arranged on the outside of the main shaft 6, and the third angular contact bearing 22 is arranged between the thrust guide plate 23 and the intermediate push plate 24, and the thrust guide plate 23 is located on the right side of the second angular contact bearing 21; The parking brake device 27 is arranged on the right end cover 4 of the motor, and the parking brake device 27 includes a parking brake nut 2701, a parking brake piston 2702, a parking brake disc spring 2703, a parking brake decompression air chamber 2704, and a parking brake decompression air inlet and outlet 2705; the parking brake nut 2701 is fixed to the right end cover 4 of the motor, a cavity is provided on the left side of the parking brake nut 2701, the parking brake disc spring 2703 is arranged in the cavity on the left side of the parking brake nut 2701, the right end of the parking brake piston 2702 is arranged in the cavity on the left side of the parking brake nut 2701 and is located on the left side of the parking brake disc spring 2703, and the left end of the parking brake piston 2702 passes through the right end cover 4 of the motor and matches with the intermediate push plate 24; A parking brake decompression air chamber 2704 is formed between the left end surface of the parking brake piston 2702 and the right end cover 4 of the motor, and a parking brake decompression air inlet and outlet 2705 is arranged in the parking brake decompression air chamber 2704; a service brake device 28 is arranged on the right end cover 4 of the motor, and the service brake device 28 includes a service brake nut 2801, a service brake piston 2802, a service brake high-pressure air chamber 2803, and a service brake high-pressure air inlet and outlet 2804; the service brake nut 2801 is fixed to the right end cover 4 of the motor Together, there is a cavity on the left side of the service brake nut 2801, the right end of the service brake piston 2802 is arranged in the cavity on the left side of the service brake nut 2801, and the left end of the service brake piston 2802 passes through the right end cover 4 of the motor and matches with the intermediate push plate 24; the right end surface of the service brake piston 2802 and the service brake nut 2801 and the right end cover 4 of the motor form a service brake high-pressure air cavity 2803, and the service brake high-pressure air inlet and outlet 2804 is arranged in the service brake high-pressure air cavity 2803. The main shaft 6 is a hollow structure, and its left end cross-sectional area is larger than its right end cross-sectional area. The parking brake piston 2702 is a mountain-shaped structure, and the service brake piston 2802 is a fork-shaped structure. The parking brake device 27 and the service brake device 28 are both two and cross-symmetrically arranged.

[0014] In the present invention, the parking brake is realized by: the parking brake disc spring 2703 pushes the parking brake piston 2702, the parking brake piston 2702 pushes the intermediate push plate 24, and through the intermediate transition, pressure is applied to the wet clutch 16 to realize braking. The driving brake is realized by: firstly, the parking brake decompression air chamber 2704 is filled with high-pressure gas, the parking brake piston 2702 applies pressure to the parking brake disc spring 2703, and the parking brake is released; secondly, the driving brake high-pressure air chamber 2803 is filled with high-pressure gas, the driving brake piston 2802 pushes the intermediate push plate 24, and through the intermediate transition, pressure is applied to the wet clutch 16 to realize braking.

[0015] 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 hub motor with a combined braking mechanism, comprising a motor housing (1) and a water jacket (2), characterized in that: It also includes a motor left end cover (3), a motor right end cover (4), a wheel hub (5), a main shaft (6), a sealing plug (7), a motor stator assembly (8), a motor rotor assembly (9), a rotor support (10), an inner gear ring (11), a planetary first-stage reduction mechanism (12), a planetary second-stage reduction mechanism (13), a first tapered roller bearing (14), a second tapered roller bearing (15), a wet clutch (16), a rotary rotor support (17), a rotary rotor (18), a rotary stator (19), a first angular contact bearing (20), a second angular contact bearing (21), a third angular contact bearing (22), a thrust guide plate (23), an intermediate thrust plate (24), an end taper plate (25), a brake pad adapter plate (26), a parking brake device (27), and a service brake device (28); The water jacket (2) is arranged on the outside of the motor housing (1); the motor left end cover (3) and the motor right end cover (4) are arranged on the left and right ends of the motor housing (1) and are fixed together; the left end of the main shaft (6) is fixed together with the wheel hub (5); the left end of the main shaft (6) is connected to the motor left end cover (3) through a first tapered roller bearing (14); the right end of the main shaft (6) is connected to the motor right end cover (4) through a second tapered roller bearing (15); the sealing plug (7) is arranged on the right end of the main shaft (6) and is fixed together with the motor right end cover (4); The motor stator assembly (8), the motor rotor assembly (9), the rotor support (10), the inner gear ring (11), the planetary primary reduction mechanism (12), the planetary secondary reduction mechanism (13), the wet clutch (16), the resolver rotor support (17), the resolver rotor (18), the resolver stator (19), the first angular contact bearing (20), the second angular contact bearing (21), the third angular contact bearing (22), the thrust guide plate (23), the intermediate thrust plate (24), the end taper plate (25), and the brake pad adapter plate (26) are all arranged on the motor housing (1), the motor left end cover (3), and the motor The motor is arranged in a cavity surrounded by a right end cover (4); the inner side of the rotor support (10) is connected to the main shaft (6) through a first angular contact bearing (20); the motor rotor assembly (9) is arranged on the rotor support (10); the motor stator assembly (8) is arranged on the inner wall of the motor housing (1) and is located outside the motor rotor assembly (9); the inner side of the inner gear ring (11) is connected to the main shaft (6); the planetary primary reduction mechanism (12) and the planetary secondary reduction mechanism (13) are both arranged on the inner gear ring (11); and the planetary secondary reduction mechanism (13) is located on the left side of the planetary primary reduction mechanism (12); The inner side of the resolver rotor support (17) is connected to the main shaft (6) via a second angular contact bearing (21); the resolver rotor (18) is arranged on the resolver rotor support (17); the resolver stator (19) is arranged on the right end cover (4) of the motor and matches the resolver rotor (18); the brake pad adapter plate (26) is connected to the main shaft (6); the brake pad adapter plate (26) is located between the first angular contact bearing (20) and the second angular contact bearing (21); the wet clutch (16) and the end taper plate (25) are both arranged on the outside of the brake pad adapter plate (26); the end taper plate (25) is located on the right side of the wet clutch (16); the thrust guide plate (23) and the intermediate push plate (24) are both arranged on the outside of the main shaft (6); the third angular contact bearing (22) is arranged between the thrust guide plate (23) and the intermediate push plate (24); the thrust guide plate (23) is located on the right side of the second angular contact bearing (21); The parking brake device (27) is arranged on the right end cover (4) of the motor, and comprises a parking brake nut (2701), a parking brake piston (2702), a parking brake disc spring (2703), a parking brake decompression air chamber (2704), and a parking brake decompression air inlet and outlet (2705); the parking brake nut (2701) is fixed to the right end cover (4) of the motor, a cavity is provided on the left side of the parking brake nut (2701), the parking brake disc spring (2703) is arranged in the cavity on the left side of the parking brake nut (2701), the right end of the parking brake piston (2702) is arranged in the cavity on the left side of the parking brake nut (2701) and is located on the left side of the parking brake disc spring (2703), and the left end of the parking brake piston (2702) passes through the right end cover (4) of the motor and matches with the middle push plate (24); A parking brake decompression air chamber (2704) is formed between the left end surface of the parking brake piston (2702) and the right end cover (4) of the motor, and a parking brake decompression air inlet and outlet (2705) is arranged in the parking brake decompression air chamber (2704); The service brake device (28) is arranged on the right end cover (4) of the motor, and comprises a service brake nut (2801), a service brake piston (2802), a service brake high-pressure air chamber (2803), and a service brake high-pressure air inlet and outlet (2804); the service brake nut (2801) is fixed to the right end cover (4) of the motor, a cavity is provided on the left side of the service brake nut (2801), and a service brake piston (2802) is provided on the left side of the service brake nut (2801). The right end is arranged in the left cavity of the service brake nut (2801); the left end of the service brake piston (2802) passes through the right end cover (4) of the motor and matches with the middle push plate (24); the right end surface of the service brake piston (2802) and the service brake nut (2801) and the right end cover (4) of the motor form a service brake high-pressure air chamber (2803); the service brake high-pressure air inlet and outlet (2804) is arranged in the service brake high-pressure air chamber (2803).

2. The wheel hub motor with a combined braking mechanism according to claim 1, characterized in that The main shaft (6) is a hollow structure, and the cross-sectional area of ​​its left end is larger than the cross-sectional area of ​​its right end.

3. The wheel hub motor with a combined braking mechanism according to claim 1, characterized in that The parking brake piston (2702) is a mountain-shaped structure, and the driving brake piston (2802) is a fork-shaped structure.

4. The wheel hub motor with a combined braking mechanism according to claim 1, characterized in that The parking brake device (27) and the service brake device (28) are both in two pieces and are arranged crosswise and symmetrically.

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