CN218266904U

CN218266904U - Self-cooling electronic mechanical brake device of unmanned automobile

Info

Publication number: CN218266904U
Application number: CN202220761855.6U
Authority: CN
Inventors: 熊祖琪; 刘钦; 黄亮; 陈正华; 闵师龙; 吕宗宇; 曹天恒
Original assignee: Jiangling Motors Corp Ltd; East China Jiaotong University
Current assignee: Jiangling Motors Corp Ltd; East China Jiaotong University
Priority date: 2022-04-04
Filing date: 2022-04-04
Publication date: 2023-01-10
Anticipated expiration: 2032-04-04

Abstract

The utility model relates to a self-cooling electronic machinery arresting gear of unmanned automobile comprises arresting gear, water cooling plant and radiator fan etc.. The braking device comprises a primary bevel gear A, a secondary speed reduction bevel gear, a screw rod shaft, a screw rod nut, a connecting rod and a brake pad; the water cooling device comprises a driving piston, a cooling liquid tank, a guide pipe and a heat conducting element, wherein a cooling liquid water channel is arranged in the cooling liquid tank, a circulating water channel is arranged in the heat conducting element, the driving piston drives cooling liquid to flow into the guide pipe, then flow into the circulating water channel of the heat conducting element and finally flow back to the cooling liquid tank, and circulation of the cooling liquid is realized; the air cooling device comprises a cooling fan and the like, the rotating speed of the cooling fan is adjustable, and the heat conducting element is further cooled by changing the air flow speed. The device simple structure, design benefit, radiating effect are good, can effectively avoid the thermal decay phenomenon of braking in-process, improve the life of brake block and brake disc, solve because of the deformation problem that the brake disc both sides atress varies and cause.

Description

Self-cooling electronic mechanical brake device of unmanned automobile

Technical Field

The utility model relates to an automobile braking technical field especially relates to a self-cooling formula electromechanical brake device of unmanned car.

Background

With the continuous development of artificial intelligence technology, unmanned vehicles gradually step into the field of vision of people. The unmanned automobile is an intelligent automobile which can realize unmanned driving through a computer system, and when the unmanned automobile runs normally, the surrounding environment is required to be continuously sensed through a radar or a sensor and fed back to a control system, so that a new path is planned, and at the moment, the automobile can be braked for multiple times to reserve required time for the feedback process; after continuous braking, the friction between the brake pad and the brake disc generates a large amount of heat, which causes the temperature of the brake pad and the brake disc to rise sharply, and the brake disc is easy to have heat fading along with the rise of the temperature, thereby causing the reduction of the braking performance and influencing the driving safety.

However, in order to meet the requirements of heat dissipation and light weight, the conventional brake device is designed to be perforated and grooved or designed to be double-layer hollow, and air suction is performed by using centrifugal force to help heat dissipation, so that the heat dissipation performance of the brake disc is improved, but the rigidity of the brake disc is weakened, and therefore the brake disc is not suitable for vehicle types requiring large force and long-time braking. Therefore, the design of the self-cooling electronic mechanical brake device of the unmanned automobile with good heat dissipation, strong adaptability and high intellectualization has great significance.

After looking up relevant literature data, the chinese patent No. CN202011199287.7 discloses an "electronic mechanical device", which has a water-cooling heat dissipation device and a heat conduction device designed in the patent, which have a heat dissipation effect on a brake pad and a brake disc to a certain extent, but the independent piston pump is adopted to drive a coolant to circulate, so that the structure is more complex, the cost is higher, the designed position of a heat dissipation fan is far away from a heat source, the heat dissipation is not easy to be performed quickly, the intelligent control degree of braking and heat dissipation is not high, and the requirements of an unmanned automobile braking system cannot be well met.

SUMMERY OF THE UTILITY MODEL

In view of the above problem, the utility model provides a self-cooling formula electromechanical brake device of unmanned car.

The utility model aims to provide a self-cooling electronic mechanical brake device of an unmanned automobile, which comprises a fixed frame, a motor, a first-stage bevel gear A, a second-stage reduction bevel gear, a screw rod shaft, a screw rod nut, a connecting rod, a first-stage bevel gear B, a cooling liquid tank, a driving piston, a conduit, an air cooling tank, a heat conducting element and a brake pad, wherein the fixed frame is fixedly installed with an axle through screws for supporting and fixing the whole brake device and preventing dust from entering a transmission device; the motor is fixedly arranged on the fixed frame; the primary bevel gear A is connected with a motor shaft through a key; the second-stage speed reduction bevel gear is connected with the screw shaft through a key and meshed with the first-stage bevel gear A and the first-stage bevel gear B; the screw rod shaft is fixed on the fixed frame by centering a bearing; the screw rod nut is sleeved on the screw rod shaft; the upper end of the connecting rod is welded and fixed with the screw rod nut; the first-stage bevel gear B is fixed on the fixed rack through a bearing and is meshed with the second-stage reduction bevel gear; the cooling liquid box is connected with the fixed frame through a bolt; the driving piston is connected with a primary bevel gear B through a key; the air cooling box is fixedly connected to the connecting rod, and a cooling fan is arranged in the air cooling box; the heat conduction original paper passes through stud and is connected convenient to detach with forced air cooling case and brake block.

In the technical scheme, the self-cooling electronic mechanical brake device for the unmanned automobile further comprises an electronic control system, wherein the electronic control system controls the positive and negative rotation of a motor by sensing surrounding environment signals through a sensor so as to realize braking, resetting of a brake pad and reciprocating motion of a driving piston; the rotating speed of the cooling fan is adjusted by collecting temperature signals through the temperature sensor, and better cooling and braking effects are achieved.

Among the above-mentioned technical scheme, coolant liquid case still include drive piston installing port, water course, check valve, feed liquor interface, play liquid interface, filling opening and trade the liquid mouth, each interface all adopts sealing device, has good leakproofness. The check valve is used for controlling the cooling liquid to flow from the liquid inlet to the liquid outlet.

In the above technical scheme, the heat conduction element further comprises a guide pipe and a circulating water channel, the guide pipe is made of a heat-resistant material, and the circulating water channel increases the contact area of the cooling liquid and the heat conduction element, so that the brake pad can uniformly dissipate heat.

In the above technical scheme, the temperature sensor is installed in the central hole of the heat conduction element and used for receiving the temperature signal of the brake pad and feeding back the temperature signal to the control system, so that the rotating speed of the cooling fan is controlled.

Compared with the prior art, the utility model discloses beneficial effect below possessing.

(1) The utility model is provided with a water cooling heat dissipation device and an air cooling heat dissipation device, and the heat conduction element guides out the heat generated by the friction of the brake pad and the brake disc and transfers the heat to the circulating cooling liquid for the first step of heat dissipation; the air-cooled heat dissipation device further reduces the temperature of the cooling liquid by changing the flow rate of air, the heat dissipation effect is excellent, the brake pad is further ensured to have a good braking effect, and the service life of the brake pad is prolonged.

(2) The utility model adopts the bevel gear transmission to divide the transmission direction of the motor into a transverse direction and a longitudinal direction, thus fully improving the utilization rate of the motor, and transversely generating a pair of large and reverse braking force to push the brake pad to the brake disc by adopting the design of symmetrically arranged transmission mechanisms, thus solving the problem of deformation caused by unequal braking force at two sides of the brake disc; the power for longitudinally driving the piston is directly provided by the motor, and an independent piston pump is not needed for driving, so that the structure is simplified, and the cost is reduced.

(3) The utility model discloses a vehicle self's environmental perception system distinguishes whether need the braking to the vehicle situation of traveling to distinguish signal transmission and give control system, control system is with the motor operation of control and just, reversal, realize this arresting gear braking and reset function and drive the drive piston and carry out reciprocating motion, saved the use of reset spring etc. among the traditional arresting gear, the integrated level is higher.

(4) The utility model discloses be provided with temperature sensor, the temperature of monitoring brake block feeds back to control system to adjust radiator fan's rotational speed, optimize the utilization of electric energy.

Drawings

The present invention will be further described with reference to the accompanying drawings.

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic structural diagram of the cooling liquid tank 9 of the present invention.

Fig. 3 is a schematic structural view of the air cooling box 12 of the present invention.

Fig. 4 is a schematic view of the internal structure of the heat conducting element 13 of the present invention.

Fig. 5 is a structural view of the driving piston 10 of the present invention.

Fig. 6 is a flow chart of the control system of the present invention.

Reference numerals: 1. the hydraulic brake system comprises a fixed rack, 2. A motor, 3. A primary bevel gear A,4. A secondary speed reduction bevel gear, 5. A screw shaft, 6. A screw nut, 7. A connecting rod, 8. A primary bevel gear B,9. A cooling liquid tank, 9-1. A piston mounting port, 9-2. A water channel, 9-3. A one-way valve, 9-4. A liquid inlet port, 9-5. A liquid outlet port, 9-6. A liquid filling port, 9-7. A liquid changing port, 10. A driving piston, 10-1. A driving piston rod, 10-2. A driving piston head, 11. A guide pipe, 12. An air cooling tank, 12-1. A cooling fan, 13. A heat conducting element, 13-1. A circulating water channel, 13-2. A temperature sensor and 14. A brake pad.

Detailed Description

In order to make the technical means, creation features and achievement functions of the present invention easier to understand, the present invention is further illustrated below with reference to the accompanying drawings. The drawings are only for the purpose of illustrating the invention and do not represent the actual structure and true proportions of the invention.

As shown in fig. 1, the utility model relates to a self-cooling electronic mechanical brake device of unmanned vehicle, including fixed frame 1, motor 2, one-level bevel gear A3, second grade speed reduction bevel gear 4, lead screw shaft 5, screw-nut 6, connecting rod 7, one-level bevel gear B8, coolant liquid tank 9, driving piston 10, pipe 11, air-cooled case 12, heat-conducting element 13, brake block 14, fixed frame 1 is through screw and axle fixed mounting for support and fixed whole brake device and prevent that the dust from getting into transmission and influencing braking effect; the motor 2 is fixedly arranged on the fixed frame 1 and is used as a power source for braking and cooling liquid circulation; the primary bevel gear A3 is connected with an output shaft of the motor 2 through a key; the secondary speed reduction bevel gear 4 is connected with the screw shaft 5 through a key and is connected with the primary bevel gear A3 to play a role in reducing speed and increasing torque so as to provide larger braking force; the screw rod shaft 5 is fixed on the fixed rack 1 by taking a bearing as a center; the screw rod nut 6 is sleeved on the screw rod shaft 5, and the screw rod shaft 5 is matched with the screw rod nut 6 to convert the rotary motion of the secondary speed reduction bevel gear 4 into the linear motion of the screw rod nut 6; the upper end of the connecting rod 7 is welded and fixed with the screw rod nut 6, and the brake pad 14 is pushed to press the brake disc to realize the braking effect; the primary bevel gear B8 is fixed on the fixed frame 1 through a bearing and meshed with the secondary reduction bevel gear 4 to transmit the power of the motor 2; the cooling liquid tank 9 is connected with the fixed frame 1 through bolts; the driving piston 10 is connected with a primary bevel gear B8 through a key; the guide pipe 11 is hermetically connected with a liquid inlet port 9-4 and a liquid outlet port 9-5 of the cooling liquid tank 9, the cooling liquid is guided into the heat conducting element 13, the air cooling tank 12 is fixedly connected to the connecting rod, and a heat radiating fan 12-1 is arranged inside the air cooling tank; the heat conducting element 13 is connected with the air cooling box 12 and the brake pad 14 through the stud bolts, and is convenient to detach.

As shown in fig. 2, in order to illustrate the structure of the cooling liquid tank of the present invention, the driving piston mounting opening 9-1 is used for mounting the driving piston 10, and the existence of the check valve 9-3 enables the driving piston 10 to push the cooling liquid to flow to the liquid inlet port 9-4 through the water channel 9-2, and then to flow back to the liquid outlet port 9-5 through the conduit 11 and the circulating water channel 13-1 in the heat conducting element 13, so as to realize the circulation of the cooling liquid. The liquid adding port 9-6 and the liquid changing port 9-7 are used for changing cooling liquid used for a long time, so that the water cooling process is guaranteed to have an optimal heat dissipation effect.

As shown in fig. 5, for the control system flow chart of the present invention, the unmanned vehicle senses the surrounding environment through its sensor and radar, and transmits the signal to the ECU for discrimination, when braking is needed, the ECU controls the motor 2 to start and rotate forward, and pushes the brake block 14 to the brake disc through the ball screw mechanism, the link mechanism, etc. to generate braking force, meanwhile, the driving piston 10 transmits the driving force through the engagement of the first-level bevel gear A3, the second-level reduction bevel gear 4 and the first-level bevel gear B8, and then the piston rod 10-1 is driven through the ball screw type, so as to convert the rotary motion into linear motion, and push the driving piston head 10-2 to advance and further drive the cooling liquid circulation; after braking is finished, the ECU controls the motor to rotate reversely, so that the brake pad 14 is reset, and the driving piston 10 is reset; the temperature sensor 13-2 is fixedly installed at the central hole of the heat conducting element, converts a temperature signal into an electric signal and feeds the electric signal back to the ECU, and the ECU controls the starting and stopping of the heat radiating fan 12-1 and the rotating speed thereof to further radiate the heat conducting element 13.

The working principle of the utility model is as follows.

When the unmanned vehicle is judged to need braking by the environment sensing system, the control system controls the motor 2 to start and rotate forwards, the motor shaft drives the first-stage bevel gear A3 to rotate, then the motor shaft is meshed with the second-stage reduction bevel gear 4 to convert longitudinal rotary motion into transverse rotary motion, so that the effects of changing the transmission direction and reducing the speed and increasing the torque are achieved, then the rotary motion of the second-stage reduction bevel gear 4 is converted into linear motion by the ball screw mechanism formed by combining the screw shaft 5 and the screw nut 6, the rotary directions of the second-stage reduction bevel gears on the left side and the right side are opposite, so that the screw shaft 5 and the screw nut 6 on the two sides are designed to be opposite in rotary direction, a large reverse thrust can be generated and transmitted to the connecting rod 7 by the screw nut 6, and finally the brake pad 14 is pushed to press to a brake disc, so that the braking function is achieved.

Meanwhile, the motor 2 rotates forwards to the first-stage bevel gear A3 and then to the second-stage reduction bevel gear 4 through the motor shaft to drive the first-stage bevel gear B8 to rotate, so that the driving piston rod 10-1 rotates, the driving piston rod 10-1 and the driving piston head 10-2 are designed by adopting a ball screw principle, the driving piston rod 10-1 is equivalent to a screw rod shaft, the driving piston head 10-2 is equivalent to a screw nut, when the driving piston rod 10-1 rotates fixedly, the driving piston head 10-2 can perform forward feeding motion, the driving piston 10 can only push cooling liquid to flow to the liquid inlet interface 9-4 of the cooling liquid tank 9 along the water channel 9-2 and then to flow to the circulating water channel 13-1 of the heat conducting element 13 through the guide pipe 11 due to the existence of the one-way valve 9-3, heat generated by friction of the brake pad 14 and the brake disc is transferred to the cooling liquid in the heat conducting element 13, and then flows back to the cooling liquid tank 9 through the liquid outlet interface 9-5, and the function of water cooling circulation and heat dissipation is realized. Meanwhile, the temperature sensor 13-2 measures the temperature of the heat conducting element 13, converts a temperature signal into an electric signal and feeds the electric signal back to the ECU, and the ECU controls the starting and stopping of the cooling fan 12-1 and the rotating speed thereof to further cool the heat conducting element 13, so that the air cooling and heat dissipation function is realized.

When braking is finished, the control system controls the motor 2 to rotate reversely, and then through the transmission flow of the braking process, the screw rod shaft 5 pushes the screw rod nut 6 to drive the connecting rod 7 to pull back the brake pad 14, so that the reset function of the brake pad 14 is realized. Meanwhile, the reverse rotation of the primary bevel gear B8 drives the driving piston rod 10-1 to reversely rotate, and finally drives the driving piston head 10-2 to complete backward feeding movement, so that the reset function of the driving piston 10 is realized.

It should be noted that, in this document, the terms indicating the orientation or position such as "left", "right", "front", "back", etc. are only the orientation or position shown in the drawings, and are only used for convenience of describing the embodiments of the present invention, and do not indicate or imply that the device or member indicated must have a specific orientation, and therefore, the present invention should not be construed as being limited thereto.

Claims

1. A self-cooling electronic mechanical brake device of an unmanned automobile comprises a fixed frame (1), a motor (2), a first-level bevel gear A (3), a second-level speed reduction bevel gear (4), a screw shaft (5), a screw nut (6), a connecting rod (7), a first-level bevel gear B (8), a cooling liquid tank (9), a driving piston (10), a guide pipe (11), an air cooling tank (12), a heat conducting element (13) and a brake pad (14), and is characterized in that: the fixed frame (1) is fixedly arranged with the axle through screws and is used for supporting and fixing the whole braking device and preventing dust from entering the transmission device; the motor (2) is fixedly arranged on the fixed rack (1); the primary bevel gear A (3) is connected with a motor shaft through a key; the two-stage speed reduction bevel gear (4) is connected with the screw shaft (5) through a key and meshed with the first-stage bevel gear A (3) and the first-stage bevel gear B (8); the screw shaft (5) is fixed on the fixed frame (1) by centering a bearing; the screw rod nut (6) is sleeved on the screw rod shaft (5); the upper end of the connecting rod (7) is welded and fixed with the screw rod nut (6); the primary bevel gear B (8) is fixed on the fixed rack (1) through a bearing and is meshed with the secondary speed reduction bevel gear (4); the cooling liquid box (9) is connected with the fixed frame (1) through a bolt; the driving piston (10) is connected with a primary bevel gear B (8) through a key; the air cooling box (12) is fixedly connected to the connecting rod (7), and a cooling fan (12-1) is arranged in the air cooling box; the heat conducting element (13) is connected with the air cooling box (12) through a stud bolt, and is convenient to detach.

2. A self-cooling electromechanical brake device for an unmanned vehicle as claimed in claim 1, wherein: the self-cooling electronic mechanical brake device of the unmanned automobile further comprises an electronic control system, wherein the electronic control system controls the motor (2) to rotate forwards and backwards by sensing surrounding environment signals through a sensor so as to realize braking, resetting of a brake pad (14) and reciprocating motion of a driving piston (10); the rotating speed of the cooling fan (12-1) is adjusted by collecting temperature signals through the temperature sensor (13-2), and better cooling and braking effects are achieved.

3. The self-cooling electromechanical brake device for the unmanned vehicle as claimed in claim 1, wherein: the cooling liquid tank (9) further comprises a driving piston mounting port (9-1), a water channel (9-2), a one-way valve (9-3), a liquid inlet interface (9-4), a liquid outlet interface (9-5), a liquid feeding port (9-6) and a liquid changing port (9-7), wherein each interface adopts a sealing device and has good sealing performance; the one-way valve (9-3) can control the cooling liquid to flow from the liquid inlet to the liquid outlet, so that the circulation of the cooling liquid is realized.

4. The self-cooling electromechanical brake device for the unmanned vehicle as claimed in claim 1, wherein: the operation and the positive and negative rotation of the motor (2) are controlled by a control system, so that the braking and resetting functions of the braking device are realized, and the driving piston (10) is driven to reciprocate.