CN112606810B - Dual-motor control hydraulic brake with parking function - Google Patents
Dual-motor control hydraulic brake with parking function Download PDFInfo
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- CN112606810B CN112606810B CN202011571258.9A CN202011571258A CN112606810B CN 112606810 B CN112606810 B CN 112606810B CN 202011571258 A CN202011571258 A CN 202011571258A CN 112606810 B CN112606810 B CN 112606810B
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- 230000007246 mechanism Effects 0.000 claims abstract description 64
- 239000012530 fluid Substances 0.000 claims abstract description 7
- 238000007789 sealing Methods 0.000 claims description 29
- 230000002441 reversible effect Effects 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 6
- 238000009423 ventilation Methods 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 22
- 238000013016 damping Methods 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 230000009977 dual effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 238000012423 maintenance Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
- B60T13/745—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive acting on a hydraulic system, e.g. a master cylinder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
- B60T13/746—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive and mechanical transmission of the braking action
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Braking Systems And Boosters (AREA)
- Braking Arrangements (AREA)
Abstract
A two-motor control hydraulic brake with a parking function comprises: service brake mechanism, direction stop gear, brake master cylinder and parking brake mechanism. The invention utilizes the service braking motor and the parking braking motor, and uses a set of device to complete service braking and parking braking, when one braking motor fails, the other braking motor can still provide a certain braking force; when braking, the two brake motors can work together to quickly reach the required braking force; by using the control of the double motors, the required torque can be distributed to the two motors, so that the requirements on the performance of the motors and the transmission ratio of a transmission system are reduced; by using the pressing force of the parking spring, under the condition that the brake fluid is slightly leaked, enough parking braking force can still be provided; the front limiting nut, the rear limiting nut and the limiting block are utilized for limiting, absorbing energy and damping, so that the direct contact between the limiting slide rod and the gear is avoided, and the service life of parts is prolonged; utilize the breather valve, avoid because of temperature variation, gas expansion leads to the inefficacy of seal structure.
Description
Technical Field
The invention relates to the technical field of unmanned braking, in particular to a double-motor control hydraulic brake with a parking function, which can integrate the functions of a service braking system for controlling the deceleration or stop of a vehicle in the motion process and a parking braking system for controlling the vehicle not to slide when the vehicle is parked without additionally arranging the parking braking system.
Background
The automobile brake system in the prior art generally comprises two independent devices, namely a service brake device and a parking brake device, and the service brake power assisting device of the traditional fuel vehicle mostly adopts a vacuum booster, and increases pedal force by utilizing negative pressure so as to increase the displacement of a master cylinder piston. The electric automobile mostly adopts a motor power assisting device, and the output torque of a motor is amplified by a transmission system to increase the pedal stroke so as to increase the displacement of a master cylinder piston; the parking brake system is generally a traditional mechanical hand brake structure or an electronic parking brake system, a rear wheel caliper is pressed on a brake pad by using a steel wire or other mechanisms, and the parking brake is realized by using the friction force between the brake pad and a brake disc.
For example, the automobile brake system disclosed in the publication No. CN208006932U entitled "an unmanned automobile dual-redundancy brake system execution device and automobile brake system" includes a main cylinder push rod, a main cylinder push rod connecting piece, a fixed block, a primary first transmission component and a second transmission component; the first transmission assembly comprises a first driver, a first worm wheel, a first gear, a first intermediate shaft and a first-stage first rack; the second transmission assembly comprises a second driver, a second worm wheel, a second gear, a second intermediate shaft and a second rack. The two sets of transmission systems are driven by two independent motors, and finally the two racks push the main cylinder push rod together. When a certain driving motor fails or a certain set of transmission system fails, the single transmission system can still work normally.
However, in the scheme, the worm gear is adopted for transmission, so that the transmission efficiency is reduced, the performance of the motor cannot be fully exerted, and in addition, a parking brake mechanism needs to be additionally arranged, so that the number of parts is increased, and the cost is increased.
Therefore, how to integrate the functions of a service braking system for controlling the deceleration or stop of the vehicle in the moving process and a parking braking system for controlling the vehicle not to slide when the vehicle stops is not needed to be additionally provided, and the problem of overlarge size of the motor and the transmission mechanism becomes a technical problem which needs to be solved urgently in the prior art.
Disclosure of Invention
The invention aims to provide a double-motor control hydraulic brake with a parking function, which can integrate a service braking system for controlling deceleration or stop of a vehicle in the motion process and a parking braking system function for controlling the vehicle not to slide when the vehicle stops, does not need to be additionally provided with a parking braking system, and solves the problems of overlarge size of a motor and a transmission mechanism, parking braking force maintenance after hydraulic leakage and safety after motor failure.
In order to achieve the purpose, the invention adopts the following technical scheme:
a double-motor controlled hydraulic brake with parking function is characterized in that,
the method comprises the following steps: the device comprises a service braking mechanism, a guide limiting mechanism, a brake main cylinder and a parking braking mechanism;
wherein the service braking mechanism comprises: the device comprises a service brake motor, a service brake motor gear, a primary driven gear, a secondary driving gear, a secondary driven gear, a gear shaft, a secondary gear bearing, a hollow screw rod, a main cylinder ejector rod seat and a main cylinder ejector rod;
the output shaft of the service brake motor is provided with the service brake motor gear through a flat key, the service brake motor gear is meshed with the primary driven gear, the primary driven gear is mounted on a gear shaft, the primary driven gear is coaxially provided with the secondary driving gear, the secondary driving gear is meshed with the secondary driven gear, the secondary driven gear is provided with a boss, the outer ring of the boss is matched with the inner ring of a bearing of the secondary gear, and the thread position of the inner hole of the boss of the secondary driven gear is provided with the hollow screw rod; the head of the hollow screw rod is in interference fit with a limiting slide rod, a push rod with clearance fit is arranged in the hollow screw rod, the front end of the push rod penetrates through the limiting slide rod to be in interference fit with a master cylinder ejector rod seat, the master cylinder ejector rod penetrates through the master cylinder ejector rod seat to be connected with the push rod, and the limiting slide rod is coaxially assembled with the master cylinder ejector rod seat; the service brake mechanism drives a service brake motor gear to rotate by using a service brake motor and drives a primary driven gear and a secondary driving gear to rotate, and the secondary driving gear drives a secondary driven gear to rotate, so that the secondary driven gear drives a hollow lead screw to move forward, a limit slide bar and a main cylinder ejector rod seat are pushed to move forward, and a push rod and a main cylinder ejector rod are driven to move forward linearly;
the direction stop gear includes: the device comprises a guide round rod, a limiting slide rod, a limiting block, a front limiting nut, a rear limiting nut and a return spring;
the head of the hollow screw rod is provided with the limiting slide rod in an interference fit manner, two sides of the limiting slide rod are outwards provided with the limiting blocks, and the limiting blocks penetrate through the guide round rod and slide back and forth on the guide round rod; the front limiting nut and the rear limiting nut are fixed on the guide round rod, a return spring is arranged in the extending direction of the main cylinder ejector rod, one end of the return spring abuts against the limiting slide rod, the other end of the return spring abuts against the rear shell, and the guide limiting mechanism finishes guide limiting by utilizing the limiting slide rod to slide between the front limiting nut and the rear limiting nut;
the parking brake mechanism includes: the parking brake device comprises a parking brake motor, a parking brake motor gear, a parking brake driven gear, a parking driven gear bearing, a threaded rod, a parking brake nut, a parking spring and a push rod;
the parking brake system comprises a parking brake motor, a parking brake motor gear, a parking brake motor driven gear, a hollow screw rod, a parking brake nut and a parking spring, wherein the parking brake motor gear is assembled on an output shaft of the parking brake motor through a flat key, the parking brake motor gear is meshed with the parking brake driven gear, the hollow screw rod is internally provided with the threaded rod, the parking brake nut and the parking spring in sequence, the parking brake driven gear is matched with the threaded rod through the key, the external thread of the threaded rod is matched with the internal thread of the parking brake nut, the parking brake nut is slidably positioned in the hollow screw rod, one end of the parking spring abuts against the parking brake nut, the other end of the parking brake spring abuts against a push rod, and the front end of the push rod is connected with a main cylinder ejector rod seat through interference fit; parking braking mechanism is rotatory by parking braking motor drive parking braking motor gear, drives parking braking driven gear and threaded rod rotatory, converts parking braking driven gear's rotary motion into parking braking nut's linear motion through the screw-thread fit, and parking braking nut is linear motion extrusion parking spring under the drive of threaded rod.
Optionally, the service braking mechanism is further provided with a gear shaft limiting check ring and a first limiting check ring, and the gear shaft limiting check ring is used for completing axial positioning of the secondary driving gear and the primary driven gear; the first limiting retainer ring is arranged on a boss of the secondary driven gear to complete axial positioning of the secondary gear bearing and the secondary driven gear.
Optionally, the hydraulic brake further comprises a sealing mechanism, wherein the sealing mechanism comprises a front cover, a front shell, a middle shell, a rear shell and a motor sealing ring;
the service brake motor and the brake master cylinder are arranged on the back surface of the rear shell, and a motor sealing ring is arranged between the service brake motor and the rear shell and is tightly pressed by a screw to realize the installation and the sealing of the service brake motor; the parking brake motor is arranged on the back surface of the front shell, a motor sealing ring is arranged between the parking brake motor and the front shell, and the motor sealing ring is pressed tightly by using a screw to complete the installation and sealing of the parking brake motor; the front surface of the rear shell is provided with a middle shell, and the rear shell and the middle shell are fixed by screws, so that the transmission mechanism and the guide limiting mechanism are positioned in a space formed by the middle shell and the rear shell; the front side of the middle shell is provided with a front shell, the middle shell and the front shell are fixed by welding, the front shell and the front cover are fixed by screws to form a sealed space, and the hollow screw rod penetrates through the middle shell and is positioned in the sealed space formed by the middle shell and the front shell together with the parking brake mechanism.
Optionally, among the parking braking mechanism, the terminal surface of parking braking driven gear designs the boss towards the protecgulum direction, and the cooperation of boss outer lane and parking driven gear bearing inner race, parking driven gear bearing outer lane and protecgulum cooperation accomplish the fixed of parking braking driven gear.
Optionally, the main cylinder ejector rod penetrates through the main cylinder ejector rod seat and is connected with the push rod through a ball pin, and the outer ring of the secondary gear bearing is fixed with the middle shell bulge.
Optionally, a ventilation valve is arranged on the side surface of the rear shell.
Optionally, when there is no braking requirement, the service braking mechanism, the guiding limiting mechanism and the parking braking mechanism are all in initial positions, and the rear end of the limiting block is in contact with the rear limiting nut; when the service braking is required, the service braking motor receives an instruction, and the service braking part of the brake starts to work: the service brake motor outputs torque, the torque is transmitted to the secondary driven gear through the speed reduction and torque increase of the service brake motor gear, the primary driven gear and the secondary driving gear, and the secondary driven gear is matched with the hollow screw rod through threads at the inner hole of the boss, so that the motion mode is changed from the rotary motion of the service brake motor to the linear motion of the hollow screw rod; the push rod, the limiting slide rod, the main cylinder ejector rod seat and the main cylinder ejector rod are driven by the hollow lead screw to do linear motion, and the main cylinder ejector rod pushes the brake main cylinder piston to establish brake pressure, so that high-pressure brake fluid is pushed to each wheel cylinder to realize hydraulic braking; the return spring generates pressing force under the pushing of the limiting slide rod, and when the front end of the limiting block touches the front limiting nut, the stroke of the hollow screw rod reaches the maximum and generates the maximum braking force; when the service braking requirement is finished, the service braking motor is electrified with reverse current, the limiting slide rod, the master cylinder ejector rod seat, the push rod and the hollow screw rod move backwards in a straight line under the acting force of the return spring and the brake master cylinder piston, and when the rear end of the limiting block is contacted with the rear limiting nut, the hollow screw rod returns to the initial position to complete one service braking.
Optionally, when there is a parking brake demand, the parking brake motor receives a command, and the brake parking brake part starts to work at this time: the parking brake motor outputs torque, and the motor torque is transmitted to the threaded rod through the speed reduction and torque increase of the parking brake motor gear and the parking brake driven gear; the parking brake device is characterized in that the rotation motion of a parking brake motor is changed into the linear motion of a parking brake nut by utilizing the matching of a threaded rod and the parking brake nut, the parking brake nut is driven by the threaded rod to do linear motion, and a parking spring positioned on the front end surface of the brake nut is extruded to generate pressing force; at the moment, the other end of the parking spring abuts against the push rod and pushes the push rod to do linear motion, under the driving of the push rod, the main cylinder ejector rod seat and the main cylinder ejector rod do linear motion to push the brake main cylinder piston to establish brake pressure, after the parking brake requirement is finished, the parking brake motor is electrified with reverse current, the threaded rod reversely rotates to drive the parking brake nut, the parking spring, the push rod, the main cylinder ejector rod seat and the main cylinder ejector rod to return, and the parking brake is released.
Optionally, when there is an emergency braking demand, the service braking motor and the parking braking motor receive an instruction at the same time, and at this time, the service braking part and the parking braking part of the brake start to work at the same time: the service brake mechanism transmits torque to the hollow screw rod through the service brake motor, the main cylinder ejector rod pushes the main cylinder piston to build pressure through linear motion under the pushing of the hollow screw rod, meanwhile, the output torque of the parking brake motor is transmitted to the threaded rod through the parking brake motor gear and the parking brake driven gear, the parking spring generates pressing force to push the push rod to move linearly through the linear motion of the parking brake nut, and therefore the main cylinder ejector rod seat and the main cylinder ejector rod are pushed to continuously push the main cylinder piston to build pressure.
The invention further discloses an electric automobile which is provided with the double-motor control hydraulic brake with the parking function.
The invention has the following advantages:
1. by using the double motors, two functions of service braking and parking braking can be realized by using one set of device; when one brake motor fails, the other brake motor still can provide certain braking force, so that double insurance is realized; when the invention is used for braking, the service braking motor and the parking braking motor can work together, and the required braking force can be quickly achieved.
2. By using the control of the double motors, the required torque can be distributed to the two motors, and the requirements on the performance of the motors and the transmission ratio of a transmission system can be reduced.
3. By using the pressing force of the parking spring, the sufficient parking braking force can still be provided under the condition that the brake fluid slightly leaks.
5. The front limiting nut and the rear limiting nut on the guide round rod and the limiting blocks are utilized for limiting, absorbing energy and damping, the direct contact between the limiting slide rod and the gear is avoided, and the service life of parts is prolonged.
6. Utilize the breather valve on the casing, avoid because of temperature variation, gas expansion leads to seal structure's inefficacy.
Drawings
Fig. 1 is an overall structural view of a dual-motor controlled hydraulic brake with a parking function according to an embodiment of the present invention;
FIG. 2 is a partial cross-sectional view of a dual motor controlled hydraulic brake with parking function according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating an overall assembly effect of the dual-motor controlled hydraulic brake with parking function according to the embodiment of the present invention;
FIG. 4 is a cross-sectional view of a brake section actuator of the dual motor controlled hydraulic brake with park function in accordance with an embodiment of the present invention;
fig. 5 is a sectional view of a parking brake part transmission mechanism of a dual motor controlled hydraulic brake with a parking function according to an embodiment of the present invention.
The reference numerals in the drawings respectively refer to the technical features:
1. a brake master cylinder; 2. a return spring; 3. a main cylinder ejector rod; 4. a master cylinder push rod seat; 5. a limiting slide bar; 6. a secondary driven gear; 7. a secondary gear bearing; 8. a first limit retainer ring; 9. a parking spring; 10. a parking brake nut; 11. a push rod; 12. a threaded rod; 13. a parking brake driven gear; 14. a parking driven gear bearing; 15. a parking brake motor gear; 16. a parking brake motor; 17. a hollow lead screw; 18. a gear shaft; 19. a secondary drive gear; 20. a service brake motor gear; 21. a primary driven gear; 22. a motor sealing ring; 23. a service brake motor; 24. a gear shaft limiting retainer ring; 25. a rear limit nut; 26. a limiting block; 27. a front limit nut; 28. a guide round bar; 29. a middle shell; 30. a front housing; 31. a front cover; 32, a first step of removing the first layer; a rear housing; 33; and (4) a ventilation valve.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Referring to fig. 1 and 2, there are shown an overall structural view and a partial sectional view of a dual motor controlled hydraulic brake with a parking function according to an embodiment of the present invention.
A two-motor control hydraulic brake with a parking function comprises: the brake system comprises a service brake mechanism, a guide limiting mechanism, a brake master cylinder 1 and a parking brake mechanism;
wherein the service braking mechanism comprises: a service brake motor 23, a service brake motor gear 20, a primary driven gear 21, a secondary driving gear 19, a secondary driven gear 6, a gear shaft 18, a secondary gear bearing 7, a hollow screw rod 17, a main cylinder ejector rod seat 4 and a main cylinder ejector rod 3;
the output shaft of the service brake motor 23 is provided with the service brake motor gear 20 through a flat key, the service brake motor gear 20 is meshed with the first-stage driven gear 21, the first-stage driven gear 21 is installed on the gear shaft 18 fixed between the middle shell 29 and the rear shell 32, the first-stage driven gear 21 is coaxially provided with the second-stage driving gear 19 towards the middle shell 29 direction, the second-stage driving gear 19 is meshed with the second-stage driven gear 6, the second-stage driven gear 6 is provided with a boss towards the middle shell 29 direction, the outer ring of the boss is matched with the inner ring of the second-stage gear bearing 7, and the hollow screw rod 17 is arranged at the boss inner hole thread of the second-stage driven gear 6; the head of the hollow screw rod 17 is in interference fit with the limiting slide rod 5, and the push rod 11 is in clearance fit in the hollow screw rod 17; the front end of the push rod 11 penetrates through the limiting slide rod 5 to be in interference fit with the master cylinder ejector rod seat 4; the main cylinder ejector rod 3 penetrates through the main cylinder ejector rod seat 4 to be connected with the push rod 11, for example, through a ball pin; the limit slide bar 5 and the main cylinder ejector rod seat 4 are coaxially assembled, the service brake mechanism drives a service brake motor gear 20 to rotate by using a service brake motor 23 and drives a primary driven gear 21 and a secondary driving gear 19 to rotate, the secondary driving gear 19 drives a secondary driven gear 6 to rotate, so that the secondary driven gear 6 drives a hollow lead screw 17 to advance, the limit slide bar 5 and the main cylinder ejector rod seat 4 are pushed to advance, and a push rod 11 and a main cylinder ejector rod 3 are driven to move forwards in a linear manner;
the direction stop gear includes: the device comprises a guide round rod 28, a limit slide rod 5, a limit block 26, a front limit nut 27, a rear limit nut 25 and a return spring 2;
the head of the hollow screw rod 17 is assembled with the limiting slide rod 5 through interference fit, two sides of the limiting slide rod 5 are assembled with the limiting blocks 26 outwards, and the limiting blocks 26 penetrate through the guide round rods 28 and slide on the guide round rods 28 back and forth; the front limit nut 27 and the rear limit nut 25 are fixed on the guide round rod 28; a return spring 2 is arranged in the extending direction of the main cylinder ejector rod 3, one end of the return spring 2 is abutted against the limiting slide rod 5, and the other end of the return spring is abutted against the rear shell 32. The guiding and limiting mechanism finishes guiding and limiting by utilizing the sliding of the limiting slide rod 5 between the front limiting nut 27 and the rear limiting nut 25.
The parking brake mechanism includes: the parking brake device comprises a parking brake motor 16, a parking brake motor gear 15, a parking brake driven gear 13, a parking driven gear bearing 14, a threaded rod 12, a parking brake nut 10, a parking spring 9 and a push rod 11;
a parking brake motor gear 15, a parking brake motor gear 15 and a parking brake driven gear 13 are assembled on an output shaft of a parking brake motor 16 through a flat key and meshed, a threaded rod 12, a parking brake nut 10 and a parking spring 9 are sequentially arranged in a hollow screw rod 17, the parking brake driven gear 13 is matched with the threaded rod 12 through a key, the external thread of the threaded rod 12 is matched with the internal thread of the parking brake nut 10, the parking brake nut 10 is slidably positioned in the hollow screw rod 17, one end of the parking spring 9 abuts against the parking brake nut 10, the other end of the parking brake spring abuts against a push rod 11, and the front end of the push rod 11 is connected with a main cylinder ejector rod seat 4 through interference fit;
the parking brake mechanism is characterized in that a parking brake motor gear 15 is driven by a parking brake motor 16 to rotate to drive a parking brake driven gear 13 and a threaded rod 12 to rotate, the rotating motion of the parking brake driven gear 13 is converted into the linear motion of a parking brake nut 10 through thread matching, and the parking brake nut 10 is driven by the threaded rod 12 to do linear motion to extrude a parking spring 9. The other end of the parking spring 9 is abutted to the push rod 11, so that the push rod 11 is pushed to do linear motion by the aid of the elastic force of the compressed parking spring 9, and the master cylinder ejector rod seat 4 and the master cylinder ejector rod 3 are pushed to do linear motion to achieve a parking braking function.
Furthermore, the transmission mechanism is also provided with a gear shaft limiting retainer ring 24 and a first limiting retainer ring 8, and the gear shaft limiting retainer ring 24 is utilized to complete the axial positioning of the secondary driving gear 19 and the primary driven gear 21; the first limit retainer ring 8 is arranged on a boss of the secondary driven gear 6 to complete the axial positioning of the secondary gear bearing 7 and the secondary driven gear 6.
In addition, the hydraulic brake further comprises a sealing mechanism, wherein the sealing mechanism comprises a front cover 31, a front shell 30, a middle shell 29, a rear shell 32 and a motor sealing ring 22;
the service brake motor 23 and the brake master cylinder 1 are arranged on the back surface of the rear shell 32, and a motor sealing ring 22 is arranged between the service brake motor 23 and the rear shell 32 and presses the motor sealing ring 22 by using a screw to realize the installation and sealing of the service brake motor 23; the parking brake motor 16 is arranged on the back surface of the front shell 30, a motor sealing ring 22 is arranged between the parking brake motor 16 and the front shell 30, and the motor sealing ring 22 is pressed by a screw to complete the installation and sealing of the parking brake motor 16; the front surface of the rear shell 32 is provided with a middle shell 29, and the rear shell 32 and the middle shell 29 are fixed by screws, so that the transmission mechanism and the guide limiting mechanism are positioned in a space formed by the middle shell 29 and the rear shell 32; the front surface of the middle shell 29 is provided with a front shell 30, the middle shell 29 and the front shell 30 are fixed by welding, the front shell 30 and the front cover 31 are fixed by screws to form a sealed space, wherein the hollow screw rod 17 penetrates through the middle shell 29 and is positioned in the sealed space formed by the middle shell 29 and the front shell 30 together with the parking brake mechanism.
Further, in the parking brake mechanism, a boss is designed on the end face of the parking brake driven gear 13 towards the front cover 31, the outer ring of the boss is matched with the inner ring of the parking driven gear bearing 14, and the outer ring of the parking driven gear bearing 14 is matched with the front cover 31 to complete the fixing of the parking brake driven gear.
Further, the ventilation valve 33 is arranged on the side surface of the rear shell 32 to prevent the situation that the sealing structure fails due to the change of air pressure in the closed space caused by the change of temperature.
Optionally, the outer ring of the secondary gear bearing 7 is fixed with the middle shell 29 in a protruding manner.
Referring to fig. 3 to 5, the dual-motor controlled hydraulic brake with parking function of the present invention operates as follows:
when no braking requirement exists, the service braking mechanism, the guiding limiting mechanism and the parking braking mechanism are all in initial positions, and the rear end of the limiting block 26 is in contact with the rear limiting nut 25; when there is a service braking demand, the service brake motor 23 receives the command, and the service braking part of the brake starts to work: the service brake motor 23 outputs torque, the torque is transmitted to the secondary driven gear 6 through the speed reduction and torque increase of the service brake motor gear 20, the primary driven gear 21 and the secondary driving gear 19, the secondary driven gear 6 is matched with the hollow screw rod 17 through threads at the inner hole of the boss, and the motion mode is changed from the rotary motion of the service brake motor to the linear motion of the hollow screw rod 17; the push rod 11, the limiting slide rod 5, the master cylinder ejector rod seat 4 and the master cylinder ejector rod 3 are driven by the hollow screw rod 17 to do linear motion, the master cylinder ejector rod 3 pushes the brake master cylinder 1 piston to establish brake pressure, and therefore high-pressure brake fluid is pushed to each wheel cylinder to achieve hydraulic braking; the return spring 2 generates pressing force under the pushing of the limiting slide rod 5, and when the front end of the limiting block 26 touches the front limiting nut 27, the stroke of the hollow screw rod 17 reaches the maximum and generates the maximum braking force; when the service braking requirement is finished, the service braking motor 23 is electrified with reverse current, the limiting slide rod 5, the main cylinder ejector rod 3, the main cylinder ejector rod seat 4, the push rod 11 and the hollow screw rod 17 move backwards in a straight line under the acting force of the return spring 2 and the piston of the brake main cylinder 1, and when the rear end of the limiting block 26 is in contact with the rear limiting nut 25, the hollow screw rod 17 returns to the initial position, so that one service braking is finished.
When there is a need for parking brake, the parking brake motor 16 receives a command, at which time the brake parking brake part starts to operate: the parking brake motor 16 outputs torque, and the motor torque is transmitted to the threaded rod 12 through the speed reduction and torque increase of the parking brake motor gear 15 and the parking brake driven gear 13; the rotation motion of a parking brake motor 16 is changed into the linear motion of a parking brake nut 10 by utilizing the matching of a threaded rod 12 and the parking brake nut 10, the parking brake nut 10 is driven by the threaded rod 12 to do linear motion, and a parking spring 9 positioned on the front end surface of the parking brake nut 10 is extruded to generate pressing force; at the moment, the other end of the parking spring 9 abuts against the push rod 11 and pushes the push rod 11 to do linear motion, and under the driving of the push rod 11, the main cylinder ejector rod seat 4 and the main cylinder ejector rod 3 do linear motion to push the piston of the brake main cylinder 1 to establish brake pressure. The self-locking phenomenon of the threaded rod 12 is utilized to maintain the braking force of the parking brake motor 16 after being powered down. After the parking braking requirement is finished, the parking braking motor 16 is electrified with reverse current, the threaded rod 12 reversely rotates to drive the parking braking nut 10, the parking spring 9, the push rod 11, the main cylinder ejector rod seat 4 and the main cylinder ejector rod 3 to return, and the parking braking is released.
When an emergency braking demand exists, the service brake motor 23 and the parking brake motor 16 receive instructions simultaneously, and the service brake part and the parking brake part of the brake start to work simultaneously: the service brake mechanism transmits torque to the hollow screw rod 17 through the service brake motor 23, the main cylinder ejector rod 3 pushes the main cylinder piston to build pressure through linear motion under the pushing of the hollow screw rod 17, meanwhile, the output torque of the parking brake motor 16 is transmitted to the threaded rod 12 through the parking brake motor gear 15 and the parking brake driven gear 13, the parking spring 9 generates pressing force to push the push rod 11 to move linearly through the linear motion of the parking brake nut 10, and therefore the main cylinder ejector rod seat 4 and the main cylinder ejector rod 3 are pushed to continue to push the main cylinder piston to build pressure.
From the above principle, it can be known that:
when one brake motor breaks down, the work of the other brake motor is not influenced, and the torque of the motor can still be transmitted to the main cylinder ejector rod 3, so that the main cylinder piston is pushed to form braking force.
When brake fluid leaks slightly due to long-term extrusion of the brake master cylinder 1, the parking spring 9 has certain pretightening force, so that when the parking brake motor 16 does not send a torque signal, the parking spring 9 still has certain deformation to enable the master cylinder ejector rod 3 to extrude the brake master cylinder 1, and a new parking brake balance state is achieved.
The invention further discloses an electric automobile which is provided with the double-motor control hydraulic brake with the parking function.
In summary, the invention has the following advantages:
1. by using the double motors, two functions of service braking and parking braking can be realized by using one set of device; when one brake motor fails, the other brake motor still can provide certain braking force, so that double insurance is realized; when the invention is used for braking, the service brake motor 23 and the parking brake motor 16 can work together, and the required braking force can be quickly achieved.
2. By using the control of the double motors, the required torque can be distributed to the two motors, and the requirements on the performance of the motors and the transmission ratio of a transmission system can be reduced.
3. By using the pressing force of the parking spring, the sufficient parking braking force can still be provided under the condition that the brake fluid slightly leaks.
5. The front limiting nut and the rear limiting nut on the guide rod and the limiting blocks are utilized for limiting, absorbing energy and damping, so that the direct contact between the limiting slide rod and the gear is avoided, and the service life of parts is prolonged.
6. By using the vent valve 33 on the shell, failure of the sealing structure caused by gas expansion due to temperature change is avoided.
While the invention has been described in further detail with reference to specific preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
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| CN114407857B (en) * | 2022-02-25 | 2022-12-13 | 清华大学 | Commercial vehicle driving and parking electric brake actuating device and braking method |
| CN114802154A (en) * | 2022-03-20 | 2022-07-29 | 合肥工业大学 | Coaxial dual-motor line control brake system and intelligent automobile without brake pedal |
| CN116080616B (en) * | 2023-02-22 | 2023-09-22 | 徐州淮海新能源汽车有限公司 | New energy automobile parking brake |
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