A compact decouplable electric vehicle drive device based on drum brake

Abstract

The embodiment of the application provides a compact decouplable electric vehicle driving device based on drum brake braking, an output shaft (1-1) of a motor (1) is connected with a sun gear A (2-1) of a planetary reducer (2); a force transmission disc (2-8) of the planetary reducer (2) is connected with a brake drum (3-1) of a drum brake (3); a brake frame (3-3) of the drum brake (3) is connected with a flange cup (1-2) of the motor (1); the motor (1) is connected with a suspension or a drive axle through the flange cup (1-2); power of the motor (1) is transmitted to the sun gear A (2-1) of the planetary reducer (2) through the output shaft (1-1), two-stage planetary reduction transmission is carried out, the power is output to a wheel hub or a drive axle through the force transmission disc (2-8), meanwhile, the force transmission disc (2-8) drives the brake drum (3-1) of the drum brake (3) to rotate, and the brake shoe (3-2) of the drum brake (3) is driven to abut against the brake drum (3-1) to realize friction braking through manual control of a pull wire (3-8) of the drum brake (3).

Description

Technical Field

[0001] This invention belongs to the field of electric vehicle drive technology and relates to a compact decoupled electric vehicle drive device based on drum brakes. Background Technology

[0002] Conventional drive units are generally a combination of a motor (containing an electromagnetic brake) and a reducer (cycloidal pinwheel reducer, harmonic reducer, or planetary reducer), mostly used in the joints of industrial robots. These drive units generally operate according to a predetermined program and are commonly found in automated production lines.

[0003] Electric vehicle drive systems are typically operated by humans and require real-time acceleration and deceleration adjustments based on road conditions, i.e., driving or braking. Typical brake friction pairs are sensitive to dust, especially statically charged dust reminiscent of the lunar surface; therefore, dust prevention measures are necessary to avoid affecting vehicle braking performance. Given the limited chassis space and wheel hub space in typical vehicles, there is a need to develop compact drive systems. For vehicle reliability, in the event of a drive wheel failure, decoupling measures are necessary to automate the process and prevent the vehicle from becoming stuck.

[0004] Against this backdrop, a compact, decoupled electric vehicle drive system based on drum brakes was developed. This system is compact, highly reliable, and easy to maintain, and can be widely used in the wheel drive or axle drive of various electric vehicles. Summary of the Invention

[0005] The purpose of this invention is to provide a compact, decoupled electric vehicle drive device based on drum brakes, comprising a motor 1, a planetary reducer 2, and a drum brake 3; wherein, the output shaft 1-1 of the motor 1 is connected to the sun gear A2-1 of the planetary reducer 2; the force transmission disc 2-8 of the planetary reducer 2 is connected to the brake drum 3-1 of the drum brake 3; the brake frame 3-3 of the drum brake 3 is connected to the flange cup 1-2 of the motor 1; the motor 1 is connected to the suspension or drive axle via the flange cup 1-2; the power of the motor 1 is transmitted to the sun gear A2-1 of the planetary reducer 2 via the output shaft 1-1, and after two stages of planetary reduction transmission, is output to the wheel hub or drive axle via the force transmission disc 2-8; simultaneously, the force transmission disc 2-8 drives the brake drum 3-1 of the drum brake 3 to rotate, and the manual control cable 3-8 of the drum brake 3 drives the brake shoes 3-2 of the drum brake 3 to abut against the brake drum 3-1 for friction braking.

[0006] Preferably, the motor 1 is an assembly of a cylindrical body and a cup-shaped flange, including an output shaft 1-1, a flange cup 1-2, a rotor 1-3, a coil 1-4, and a rotary transformer 1-5. The output shaft 1-1 is connected to the rotor 1-3, the rotor 1-3 is sleeved with the coil 1-4, the coil 1-4 is connected to the flange cup 1-2, the rotary transformer 1-5 is installed at the tail end of the motor, the rotating end of the rotary transformer 1-5 is connected to the rotor 1-3, and the motor 1 is connected to the planetary reducer 2 via the end face flange.

[0007] Preferably, the planetary reducer 2 includes a sun gear A2-1, planet gears A2-2, a planet carrier A2-3, planet gears B2-4, a planet carrier B2-5, a gear ring 2-6, a bearing C2-7, a transmission disc 2-8, a cylindrical key 2-9, a torsion ring 2-10, an end cap 2-11, a bearing D2-12, a bearing ring 2-13, a sealing ring A2-14, a top ring 2-15, a pressure cap A2-16, a ring 2-17, a bearing A2-18, and a shaft. In bearing B2-19, the sun gear A2-1 is connected to planet gear A2-2, planet gear A2-2 is connected to planet carrier A2-3 via bearing A2-18, the gear feature of planet carrier A2-3 is connected to planet gear B2-4, planet gear B2-4 is connected to planet carrier B2-5 via bearing B2-19, planet gears A2-2 and B2-4 mesh with ring gear 2-6, and ring gear 2-6 is connected to transmission disc 2-8 via bearings C2-7 and D2-12. Planetary carrier B2-5 is connected to force transmission disk 2-8 via cylindrical key 2-9; cylindrical key 2-9 is closed by end cover 2-11, and the orientation of the arc of cylindrical key 2-9 is adjusted by torsion ring 2-10 to achieve decoupling or coupling; bearing ring 2-13 is connected to the end face of gear ring 2-6 via screws for axial positioning on one side of bearing D2-12; ring 2-17 is sleeved on the outer surface of gear ring 2-6 for axial positioning on the other side of bearing D2-12; sealing ring A2-1... 4 are fitted onto the outer surface of ring 2-17. One side of sealing ring A2-14 is axially connected to the end face of bearing D2-12 via top ring 2-15, and the other side of sealing ring A2-14 is connected to force transmission disk 2-8 via pressure cover A2-16. Power is input through sun gear A2-1, drives planet carrier A2-3 to rotate via planet gear A2-2, drives planet carrier B2-5 to rotate via planet gear B2-4, and drives force transmission disk 2-8 to output via cylindrical key 2-9.

[0008] Preferably, the drum brake 3 includes a brake drum 3-1, brake shoes 3-2, a brake frame 3-3, a sealing ring B3-4, a pressure cap B3-5, a cam 3-6, a rocker arm 3-7, and a cable 3-8. The brake drum 3-1 is connected to the brake shoes 3-2, the cam 3-6 is connected in the middle of the brake shoes 3-2, and the cable 3-8 is connected to the cam 3-6 via the rocker arm 3-7. The two brake shoes 3-2 and the cam 3-6 are mounted on the brake frame 3-3. Dragging the cable 3-8 causes the cam 3-6 to swing via the rocker arm 3-7, and the cam 3-6 pushes the brake shoes 3-2 on both sides to contact the inner surface of the brake drum 3-1, generating friction and achieving deceleration braking. The end face of the sealing ring B3-4 is connected to the brake frame 3-3 via the pressure cap B3-5, and the inner surface of the sealing ring B3-4 is connected to the outer surface of the brake drum 3-1, achieving dustproof sealing.

[0009] Preferably, the planetary carrier B2-5 features a crescent-shaped notch at the small end for connecting the cylindrical key 2-9, and a cylindrical surface at the small end of the planetary carrier B2-5 for connecting the force transmission disk 2-8.

[0010] Preferably, the force transmission disc 2-8 features an arc-shaped notch near the central hole for connecting the cylindrical key 2-9, a central flange for power output, and an end flange for connecting the pressure cap A2-16.

[0011] Preferably, the cylindrical key 2-9 features a crescent-shaped notch on its large-end cylinder for decoupling the drive device.

[0012] The advantages of this invention compared to the prior art are:

[0013] 1. A compact, decoupled electric vehicle drive system based on drum brakes, which is compact and highly reliable;

[0014] 2. A compact, decoupled electric vehicle drive system based on drum brakes, which is easy to maintain and can be widely used in wheel drive or axle drive of various electric vehicles. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of a compact decoupled electric vehicle drive device based on drum brake according to the present invention.

[0016] Figure 2 These are related views of a compact decoupled electric vehicle drive device based on drum brake according to the present invention;

[0017] Figure 3 This is a motor view of a compact decoupled electric vehicle drive device based on drum brake according to the present invention.

[0018] Figure 4 This is a view of the reducer of a compact decoupled electric vehicle drive device based on drum brake according to the present invention.

[0019] Figure 5 This is a brake view of a compact decoupled electric vehicle drive device based on drum brake according to the present invention.

[0020] Figure 6 This is a planetary carrier B view of a reducer for a compact, decoupled electric vehicle drive device based on drum brakes according to the present invention.

[0021] Figure 7 This is a view of the force transmission disc of a reducer in a compact decoupled electric vehicle drive device based on drum brakes according to the present invention.

[0022] Figure 8 This is a cylindrical key view of a reducer for a compact, decoupled electric vehicle drive device based on drum brakes, according to the present invention. Detailed Implementation

[0023] To make the above-mentioned objectives, features and advantages of the present invention more apparent and understandable, the technical solution of the present invention will be described below in conjunction with the accompanying drawings and specific embodiments.

[0024] like Figure 1 and Figure 2 As shown, the present invention discloses a compact decoupled electric vehicle drive device based on drum brake, comprising a motor 1, a planetary reducer 2, and a drum brake 3. The device is characterized in that: the output shaft 1-1 of the motor 1 is connected to the sun gear A2-1 of the planetary reducer 2; the transmission disc 2-8 of the planetary reducer 2 is connected to the brake drum 3-1 of the drum brake 3; the brake frame 3-3 of the drum brake 3 is connected to the flange cup 1-2 of the motor 1; and the motor 1 is connected to the suspension or drive axle via the flange cup 1-2. The power of the motor 1 is transmitted to the sun gear A2-1 of the planetary reducer 2 via the output shaft 1-1, and after two stages of planetary reduction transmission, is output to the wheel hub or drive axle via the transmission disc 2-8. Simultaneously, the transmission disc 2-8 drives the brake drum 3-1 to rotate, and the brake shoes 3-2 are manually operated via the cable 3-8 to engage friction braking against the brake drum 3-1.

[0025] like Figure 1 and Figure 3 As shown, the present invention discloses a compact decoupled electric vehicle drive device based on drum brake. The motor 1 is an assembly of a cylindrical body and a cup-shaped flange. It includes an output shaft 1-1, a flange cup 1-2, a rotor 1-3, a coil 1-4, and a rotary transformer 1-5. The output shaft 1-1 is connected to the rotor 1-3, the rotor 1-3 is sleeved with the coil 1-4, the coil 1-4 is connected to the flange cup 1-2, the rotary transformer 1-5 is installed at the tail end of the motor, and the rotating end of the rotary transformer 1-5 is connected to the rotor 1-3. The motor 1 is connected to the planetary reducer 2 via the end face flange.

[0026] like Figure 1 and Figure 4 As shown, this invention discloses a compact decoupled electric vehicle drive device based on drum brake braking. The planetary reducer 2 includes a sun gear A2-1, planet gears A2-2, a planet carrier A2-3, planet gears B2-4, a planet carrier B2-5, a gear ring 2-6, a bearing C2-7, a transmission disc 2-8, a cylindrical key 2-9, a torsion ring 2-10, an end cap 2-11, a bearing D2-12, a bearing ring 2-13, a sealing ring A2-14, a top ring 2-15, a pressure cap A2-16, and a ring 2- 17. Bearings A2-18 and B2-19, wherein the sun gear A2-1 connects to planet gear A2-2, and there can be three planet gears A. Each planet gear A2-2 is connected to the planet carrier A2-3 via bearing A2-18, and there can be two bearings. The gear feature of the planet carrier A2-3 connects to planet gear B2-4, and there can be three planet gears B. Each planet gear B is connected to the planet carrier B2-5 via two bearings B. Each planet gear A and planet gear B2-4 meshes with the gear ring 2-6. Ring 2-6 is connected to the force transmission disk 2-8 via bearings C2-7 and D2-12. Planetary carrier B2-5 is connected to the force transmission disk 2-8 via cylindrical key 2-9. Cylindrical key 2-9 is closed by end cap 2-11. The orientation of the arc of cylindrical key 2-9 can be adjusted by torsion ring 2-10, thereby achieving decoupling or coupling. Bearing ring 2-13 is connected to the end face of gear ring 2-6 via screws for axial positioning on one side of bearing D2-12. Ring 2-17 is sleeved on the outer surface of gear ring 2-6 for bearing D2-12. Axial positioning on the other side; sealing ring A2-14 is fitted onto the outer surface of ring 2-17, one side of sealing ring A2-14 is axially connected to the end face of bearing D2-12 via top ring 2-15, and the other side of sealing ring A2-14 is connected to force transmission plate 2-8 via pressure cover A2-16; power is input through sun gear A2-1, drives planet carrier A2-3 to rotate through three planet gears A, drives planet carrier B2-5 to rotate through three planet gears B, and drives force transmission plate 2-8 to output through cylindrical key 2-9.

[0027] like Figure 1 and Figure 5As shown, this invention discloses a compact decoupled electric vehicle drive device based on drum brakes. The drum brake 3 includes a brake drum 3-1, brake shoes 3-2, a brake frame 3-3, a sealing ring B3-4, a pressure cap B3-5, a cam 3-6, a rocker arm 3-7, and a cable 3-8. The invention is characterized in that: the brake drum 3-1 is connected to the brake shoes 3-2, which can be two brake shoes. The cam 3-6 is connected between the two brake shoes, and the cam 3-6 is connected to the cable 3-8 via the rocker arm 3-7. The two brake shoes and the cam 3-6 are mounted on the brake frame 3-3. The cable 3-8 is pulled, causing the cam 3-6 to swing via the rocker arm 3-7. The cam 3-6 pushes the brake shoes on both sides to contact the inner surface of the brake drum 3-1, generating friction and achieving deceleration braking. The end face of the sealing ring B3-4 is connected to the brake frame 3-3 via the pressure cap B3-5, and the inner surface of the sealing ring B3-4 is connected to the outer surface of the brake drum 3-1, achieving dustproof sealing.

[0028] like Figure 1 and Figure 6 As shown, the present invention provides a compact electric vehicle drive device based on disc brakes. The planetary carrier B2-5 is characterized by a crescent-shaped notch at its small end for connecting a cylindrical key 2-9, and a cylindrical surface at the small end of the planetary carrier B2-5 for connecting a force transmission disc 2-8.

[0029] like Figure 1 and Figure 7 As shown, the present invention discloses a compact electric vehicle drive device based on disc brakes. The force transmission disc 2-8 is characterized by an arc-shaped notch near the central hole for connecting the cylindrical key 2-9, a central flange of the force transmission disc 2-8 for power output, and an end flange of the force transmission disc 2-8 for connecting the pressure cap A2-16.

[0030] like Figure 1 and Figure 8 As shown, the present invention provides a compact electric vehicle drive device based on disc brakes. The cylindrical key 2-9 features a crescent-shaped notch on its large-end cylinder for decoupling the drive device.

[0031] Obviously, those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Therefore, if these modifications and variations fall within the scope of the claims of the invention and their equivalents, the invention is also intended to include these modifications and variations.

Claims

1. A compact, decoupled electric vehicle drive system based on drum brakes, characterized in that, It includes a motor (1), a planetary reducer (2), and a drum brake (3); among which, The output shaft (1-1) of the motor (1) is connected to the sun gear A (2-1) of the planetary reducer (2); The force transmission disc (2-8) of the planetary reducer (2) is connected to the brake drum (3-1) of the drum brake (3); The brake frame (3-3) of the drum brake (3) is connected to the flange cup (1-2) of the motor (1); the motor (1) is connected to the suspension or drive axle via the flange cup (1-2); The power of the motor (1) is transmitted to the sun gear A (2-1) of the planetary reducer (2) via the output shaft (1-1). After two stages of planetary reduction transmission, the power is output to the hub or drive axle via the force transmission disc (2-8). At the same time, the force transmission disc (2-8) drives the brake drum (3-1) of the drum brake (3) to rotate. The manual control cable (3-8) of the drum brake (3) drives the brake shoe (3-2) of the drum brake (3) to press against the brake drum (3-1) for friction braking. The motor (1) is a combination of a cylindrical body and a cup-shaped flange, including an output shaft (1-1), a flange cup (1-2), a rotor (1-3), a coil (1-4), and a rotary transformer (1-5). The output shaft (1-1) is connected to the rotor (1-3), the rotor (1-3) is sleeved with the coil (1-4), the coil (1-4) is connected to the flange cup (1-2), the rotary transformer (1-5) is installed at the tail end of the motor, and the rotating end of the rotary transformer (1-5) is connected to the rotor (1-3). The motor (1) is connected to the planetary reducer (2) via the end face flange. The planetary reducer (2) includes a sun gear A (2-1), planet gears A (2-2), planet carrier A (2-3), planet gears B (2-4), planet carrier B (2-5), a gear ring (2-6), a bearing C (2-7), a transmission disc (2-8), a cylindrical key (2-9), a torsion ring (2-10), an end cap (2-11), a bearing D (2-12), a bearing ring (2-13), a sealing ring A (2-14), a top ring (2-15), a pressure cap A (2-16), a ring (2-17), and a bearing A (2-18). The sun gear A (2-1) is connected to planet gear A (2-2). Planet gear A (2-2) is connected to planet carrier A (2-3) via bearing A (2-18). The gear feature of planet carrier A (2-3) is connected to planet gear B (2-4). Planet gear B (2-4) is connected to planet carrier B (2-5) via bearing B (2-19). Planet gears A (2-2) and B (2-4) mesh with ring gear (2-6). Ring gear (2-6) is connected to the power transmission via bearings C (2-7) and D (2-12). The planetary carrier B (2-5) is connected to the power transmission disk (2-8) via a cylindrical key (2-9); the cylindrical key (2-9) is closed by an end cover (2-11), and the orientation of the arc of the cylindrical key (2-9) is adjusted by a torsion ring (2-10) to achieve decoupling or coupling; the bearing ring (2-13) is connected to the end face of the gear ring (2-6) by screws for axial positioning on one side of bearing D (2-12); the ring (2-17) is fitted onto the outer surface of the gear ring (2-6) for axial positioning on the other side of bearing D (2-12); the sealing ring A (2- 14) The sealing ring A (2-14) is fitted onto the outer surface of the ring (2-17). One side of the sealing ring A (2-14) is axially connected to the end face of the bearing D (2-12) via the top ring (2-15). The other side of the sealing ring A (2-14) is connected to the force transmission disk (2-8) via the pressure cover A (2-16). Power is input through the sun gear A (2-1), drives the planet carrier A (2-3) to rotate through the planet gear A (2-2), drives the planet carrier B (2-5) to rotate through the planet gear B (2-4), and drives the force transmission disk (2-8) to output through the cylindrical key (2-9). The drum brake (3) includes a brake drum (3-1), brake shoes (3-2), a brake frame (3-3), a sealing ring B (3-4), a pressure cap B (3-5), a cam (3-6), a rocker arm (3-7), and a cable (3-8). The brake drum (3-1) is connected to the brake shoes (3-2). The cam (3-6) is connected in the middle of the brake shoes (3-2). The cam (3-6) is connected to the cable (3-8) via the rocker arm (3-7). The two brake shoes (3-2)... The cam (3-6) is mounted on the brake frame (3-3); the drag cable (3-8) drives the cam (3-6) to swing via the rocker arm (3-7), and the cam (3-6) pushes the brake shoes (3-2) on both sides to contact the inner surface of the brake drum (3-1) to generate friction, thereby achieving deceleration and braking; the end face of the sealing ring B (3-4) is connected to the brake frame (3-3) via the pressure cap B (3-5), and the inner surface of the sealing ring B (3-4) is connected to the outer surface of the brake drum (3-1) to achieve dustproof sealing; The planetary carrier B (2-5) features a crescent-shaped notch at the small end for connecting a cylindrical key (2-9), and a cylindrical surface at the small end of the planetary carrier B (2-5) for connecting a force transmission disk (2-8). The force transmission plate (2-8) features an arc-shaped notch near the central hole for connecting a cylindrical key (2-9), a central flange for power output, and an end flange for connecting a pressure cap A (2-16). The cylindrical key (2-9) features a crescent-shaped notch on its large-end cylinder for decoupling the drive device.

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