CN108909692B - Electronic parking driving system - Google Patents
Electronic parking driving system Download PDFInfo
- Publication number
- CN108909692B CN108909692B CN201810846189.4A CN201810846189A CN108909692B CN 108909692 B CN108909692 B CN 108909692B CN 201810846189 A CN201810846189 A CN 201810846189A CN 108909692 B CN108909692 B CN 108909692B
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- China
- Prior art keywords
- switch
- pawl
- parking brake
- motor
- ratchet bar
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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
- B60T7/00—Brake-action initiating means
- B60T7/02—Brake-action initiating means for personal initiation
- B60T7/08—Brake-action initiating means for personal initiation hand actuated
- B60T7/085—Brake-action initiating means for personal initiation hand actuated by electrical means, e.g. travel, force sensors
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
The invention discloses an electronic parking driving system, which comprises a motor, wherein the motor is connected with a power supply through a current commutator, a ball screw is connected on a rotating shaft of the motor, a ratchet bar is connected on a screw nut of the ball screw, a pawl is arranged above the ratchet bar, one end of the pawl can be connected with the ratchet bar in a matching way, the other end of the pawl is connected with a reversing switch of the current reverser through a pawl pressure spring, a parking brake switch is arranged between the reversing switch and the positive pole of the power supply in series, a first electromagnetic switch is arranged between the current commutator and the positive pole of the power supply in series, the first electromagnetic switch is positioned beside the parking brake switch, a second electromagnetic switch is arranged above the pawl, a brake releasing switch is serially arranged between the positive pole of the second electromagnetic switch and the positive pole of the power supply, and a pull wire is connected between the brake releasing switch and the parking brake switch. The invention has high transmission efficiency and long service life and can overcome the defects of the prior art.
Description
Technical Field
The invention belongs to the technical field of vehicle braking systems, and particularly relates to an electronic parking driving system.
Background
With the continuous development and progress of automobile electronic technology, more and more automobiles adopt an electronic parking brake system (namely an electronic hand brake) to replace a traditional manual mechanical parking system. The existing electronic parking brake system is generally composed of a motor, a worm gear reducer or a screw nut, a control switch and the like, when an automobile is parked, parking brake force generated by the motor is transmitted to a brake through the worm gear or the screw nut, and then the brake operates to realize parking brake; after parking braking, an electronic parking braking system maintains parking braking force by means of friction self-locking performance of a worm turbine or a screw nut (namely, the worm or the screw is locked by friction force and cannot rotate), but the transmission efficiency of the worm turbine or the screw nut with the friction self-locking function is low and cannot exceed 50 percent, so that a motor with larger torque is needed, and the use cost is increased. Meanwhile, the conventional electronic parking brake system is large in friction force, so that mechanical abrasion is aggravated, and the service life is shortened. Under the above circumstances, it is necessary to provide an electronic parking driving system with high transmission efficiency and long service life.
Disclosure of Invention
The invention aims to solve the technical problem of providing an electronic parking driving system with a ball screw and a ratchet locking device, which has high transmission efficiency and long service life and can overcome the defects of the prior art.
In order to solve the technical problems, the technical scheme of the invention is as follows: an electronic parking driving system comprises an electric motor, the electric motor is connected with a power supply through a current commutator, a ball screw is connected on a rotating shaft of the motor, a ratchet bar is connected on a screw nut of the ball screw, a pawl is arranged above the ratchet bar, one end of the pawl can be connected with the ratchet bar in a matching way, the other end of the pawl is connected with a reversing switch of the current reverser through a pawl pressure spring, a parking brake switch is arranged between the reversing switch and the positive pole of the power supply in series, a first electromagnetic switch is arranged between the current commutator and the positive pole of the power supply in series, the first electromagnetic switch is positioned beside the parking brake switch, a second electromagnetic switch is arranged above the pawl, a brake releasing switch is serially arranged between the positive pole of the second electromagnetic switch and the positive pole of the power supply, and a pull wire is connected between the brake releasing switch and the parking brake switch.
The electronic parking driving system can turn off the parking brake switch by the pull wire when the parking brake switch is turned off, and can turn on the parking brake switch by the pull wire when the parking brake switch is turned off.
In the electronic parking driving system, the pawl and the ratchet bar can be released from a locked state by attraction force generated when the second electromagnetic switch is electrified.
In the electronic parking driving system, the parking brake switch can be turned off by attraction force generated by the first electromagnetic switch when the motor is locked.
When parking braking is needed, the parking braking switch is closed, the brake releasing switch is turned off, the second electromagnetic switch is in a power-off state, one end of the pawl automatically moves downwards to the ratchet bar, the other end of the pawl can rotate the reversing switch to a position enabling the motor to rotate forwards through the pawl pressure spring, and therefore the motor can rotate forwards to drive the lead screw nut of the ball screw to move leftwards, and the ratchet bar drives the parking brake to perform parking braking.
During the parking brake process, the first electromagnetic switch is in a power-on state, and the generated electromagnetic force has the tendency of turning off the parking brake switch; since the motor rotates forward, the current passing through the first electromagnetic switch is not large, and the electromagnetic force generated by the first electromagnetic switch is smaller than the locking force of the parking brake switch, the parking brake switch cannot be turned off.
When the parking brake is completely braked, the motor can not drive the ratchet bar to move leftwards, so that the motor can be locked, a large locked-rotor current is generated, the electromagnetic force of the first electromagnetic switch is increased to be larger than the locking force of the parking brake switch, the parking brake switch can be switched off, and the motor can be stopped.
After the motor stops, the pawl and the ratchet bar are in a matched locking state, so that the ratchet bar can be prevented from moving rightwards, and the parking brake can keep parking braking force.
When the parking brake needs to be released, the second electromagnetic switch is electrified to generate electromagnetic force to attract the pawl upwards by closing the brake releasing switch; since the ratchet bar is pulled rightwards by the parking brake at the moment, the ratchet bar can generate a downward pressure to act on the pawl, and the electromagnetic force generated by the second electromagnetic switch can attract the pawl; meanwhile, when the brake switch is released, the parking brake switch can be automatically driven to be closed, and one end of the pawl is in contact with the ratchet bar, so that the reversing switch is rotated to a position where the motor rotates forwards, the motor rotates forwards to pull the ratchet bar leftwards, the ratchet bar does not generate downward pressure on the pawl any more, the pawl is attracted by electromagnetic force generated by the second electromagnetic switch, and the pawl and the ratchet bar are separated from a matched locking state.
After the pawl is sucked upwards, the pawl can rotate the reversing switch to the position enabling the motor to rotate reversely through the pawl pressure spring, the motor rotates reversely at the moment to drive the screw nut of the ball screw to move rightwards, the ratchet bar is pushed rightwards, and the ratchet bar drives the parking brake to release the parking brake.
When the ratchet bar is pushed to the extreme position rightwards, the parking brake is completely released, the motor can be locked, a large locked current is generated, the electromagnetic force of the first electromagnetic switch is increased to be larger than the locking force of the parking brake switch, and therefore the parking brake switch can be turned off, and the motor can be stopped. The parking brake switch can automatically drive the brake release switch to be switched off when being switched off, so that the second electromagnetic switch is switched off, and the pawl and the ratchet bar are in a matched locking state under the action of the pawl pressure spring, so that the parking brake is ready for the next parking brake.
Compared with the prior art, the invention has the beneficial effects that: the parking brake switch and the brake release switch control the motor to rotate forwards or reversely, so that the screw nut of the ball screw is driven to do linear motion, the screw nut can pull leftwards or push rightwards the ratchet bar, and the ratchet bar drives the brake to perform parking brake or release parking brake; after the parking brake, the parking brake force is kept through the matched locking of the pawl and the ratchet bar. The ball screw with the transmission efficiency higher than 90% is adopted, the transmission efficiency of the system is obviously improved, and therefore the motor with smaller torque can be selected, and the use cost is reduced. After the parking brake is completed, the brake force is completely borne by the ratchet bar and the pawl, the motor and the ball screw are not stressed any more, and meanwhile, the friction force of the ball screw is small, so that the abrasion of the system is far less than that of an electronic parking driving system with a worm turbine or a screw nut, and the service life of the system is prolonged. In addition, the invention also has the advantages of ingenious design and small occupied area.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic view of an initial state when the parking brake is applied in the present invention.
FIG. 3 is a schematic diagram of the present invention after parking brake application is completed.
Fig. 4 is a schematic view of an initial state when the parking brake is released according to the present invention.
Fig. 5 is a schematic diagram of the invention at an intermediate stage of parking brake release.
FIG. 6 is a schematic diagram of the present invention after parking brake release is complete.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in the attached figure 1, an electronic parking driving system comprises a motor 1, the motor 1 is connected with a power supply through a current commutator 9, a ball screw 2 is connected on a rotating shaft of the motor 1, a ratchet 4 is connected on a screw nut 3 of the ball screw 2, a pawl 5 is arranged above the ratchet 4, one end of the pawl 5 can be connected with the ratchet 4 in a matching way, the other end is connected with a reversing switch 8 of the current commutator 9 through a pawl pressure spring 7, a parking brake switch 10 is arranged between the reversing switch 8 and an anode of the power supply in series, a first electromagnetic switch 11 is arranged between the current commutator 9 and the anode of the power supply in series, the first electromagnetic switch 11 is positioned beside the parking brake switch 10, a second electromagnetic switch 6 is arranged above the pawl 5, a brake release switch 12 is arranged between the anode of the second electromagnetic switch 6 and the anode of the power supply in series, a pull wire is connected between the release brake switch 12 and the parking brake switch 10.
Specifically, the parking brake switch 10 can be turned off by pulling a release brake switch 12, but the parking brake switch 10 cannot be automatically turned off when the release brake switch 12 is turned off; when the parking brake switch 10 is closed, the parking brake switch 10 can be closed by a pull wire, but when the parking brake switch 10 is closed, the parking brake switch 12 cannot be automatically closed. The attractive force generated when the second electromagnetic switch 6 is energized can enable the pawl 5 and the ratchet bar 4 to exit from the locking state. The attractive force generated by the first electromagnetic switch 11 when the motor 1 is locked can turn off the parking brake switch 10.
As shown in fig. 2, firstly, the parking brake switch 10 is closed, and since the parking brake switch 10 cannot automatically drive the brake release switch 12 to be closed when being closed, the brake release switch 12 is in an off state, the second electromagnetic switch 6 is in a power-off state, at this time, one end of the pawl 5 (namely, the left end of the pawl 5) automatically moves downwards to the ratchet bar 4, and the other end of the pawl 5 (namely, the right end of the pawl 5) rotates the reversing switch 8 to a position enabling the motor 1 to rotate forwards through the pawl pressure spring 7; then the motor 1 rotates positively to drive the screw nut 3 of the ball screw 2 to move leftwards, so that the ratchet 4 drives the parking brake to perform parking braking.
During the parking brake, the first electromagnetic switch 11 is in the energized state, the electromagnetic force it generates having a tendency to switch off the parking brake switch 10; since the electric motor 1 rotates in the normal direction, the current passing through the first electromagnetic switch 11 is not large, and the electromagnetic force generated by the first electromagnetic switch 11 is smaller than the latching force of the parking brake switch 10, the parking brake switch 10 cannot be turned off.
As shown in fig. 3, after the parking brake is completely braked, the motor 1 can not drive the ratchet 4 to move leftward any more, so that the motor 1 can be locked, a large locked current is generated, and at this time, the electromagnetic force of the first electromagnetic switch 11 is increased to be greater than the locking force of the parking brake switch 10, so that the parking brake switch 10 can be turned off, and the motor 1 can be stopped. After the motor 1 stops rotating, the pawl 5 and the ratchet bar 4 are in a matched locking state, so that the ratchet bar 4 can be prevented from moving rightwards, and the parking brake can keep the parking braking force.
Procedure or principle requiring release of parking brake: as shown in fig. 4 and 5, the electromagnetic force generated by the second electromagnetic switch 6 may attract the stationary pawl 5 because the ratchet 4 generates a downward pressure to act on the pawl 5 when the second electromagnetic switch 12 is turned on to generate an electromagnetic force to attract the pawl 5 when the second electromagnetic switch 6 is energized to generate an electromagnetic force to attract the pawl 5; meanwhile, when the brake releasing switch 12 is closed, the parking brake switch 10 can be automatically driven to be closed, and in addition, one end of the pawl 5 is in contact with the ratchet bar 4, so that the reversing switch 8 rotates to a position enabling the motor 1 to rotate forwards, the motor 1 rotates forwards to pull the ratchet bar 4 leftwards, the ratchet bar 4 does not generate downward pressure on the pawl 5 any more, the pawl 5 is attracted by the electromagnetic force generated by the second electromagnetic switch 6, and the pawl 5 and the ratchet bar 4 are separated from a matched locking state. After the pawl 5 is sucked upwards, the pawl 5 can rotate the reversing switch 8 to the position enabling the motor 1 to rotate reversely through the pawl pressure spring 7, at the moment, the motor 1 rotates reversely to drive the screw nut 3 of the ball screw 2 to move rightwards, the ratchet bar 4 is pushed rightwards, and the ratchet bar 4 drives the parking brake to release the parking brake.
As shown in fig. 6 and fig. 1, when the ratchet 4 is pushed to the right to the extreme position, the parking brake is completely released, and the motor 1 is locked, and a large locked current is generated, so that the electromagnetic force of the first electromagnetic switch 11 is increased to be greater than the locking force of the parking brake switch 10, and thus the parking brake switch 10 is turned off, and the motor 1 is stopped. The parking brake switch 10 can automatically drive the brake releasing switch 12 to be switched off when being switched off, so that the second electromagnetic switch 6 is switched off, and the pawl 5 and the ratchet bar 4 are in a matched and locked state under the action of the pawl pressure spring 7, so that preparation is made for the next parking brake.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention.
Claims (1)
1. An electronic parking driving system comprises an electric motor (1), wherein the electric motor (1) is connected with a power supply through a current commutator (9), and the electronic parking driving system is characterized in that: a ball screw (2) is connected on a rotating shaft of the motor (1), a ratchet bar (4) is connected on a screw nut (3) of the ball screw (2), a pawl (5) is arranged above the ratchet bar (4), one end of the pawl (5) can be matched and connected with the ratchet bar (4), the other end of the pawl is connected with a reversing switch (8) of a current commutator (9) through a pawl pressure spring (7), a parking brake switch (10) is serially arranged between the reversing switch (8) and the anode of a power supply, a first electromagnetic switch (11) is serially arranged between the current commutator (9) and the anode of the power supply, the first electromagnetic switch (11) is positioned beside the parking brake switch (10), a second electromagnetic switch (6) is arranged above the pawl (5), a brake release switch (12) is serially arranged between the anode of the second electromagnetic switch (6) and the anode of the power supply, a pull wire is connected between the brake releasing switch (12) and the parking brake switch (10); the parking brake switch (10) can be turned off by a pull wire when being turned off, and the parking brake switch (10) can be turned on by the pull wire when the brake switch (12) is turned off; the attractive force generated when the second electromagnetic switch (6) is electrified can enable the pawl (5) and the ratchet bar (4) to exit from a locking state; when the motor (1) is locked, the parking brake switch (10) can be switched off by the attraction force generated by the first electromagnetic switch (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810846189.4A CN108909692B (en) | 2018-07-27 | 2018-07-27 | Electronic parking driving system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810846189.4A CN108909692B (en) | 2018-07-27 | 2018-07-27 | Electronic parking driving system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108909692A CN108909692A (en) | 2018-11-30 |
| CN108909692B true CN108909692B (en) | 2021-07-06 |
Family
ID=64417514
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810846189.4A Expired - Fee Related CN108909692B (en) | 2018-07-27 | 2018-07-27 | Electronic parking driving system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108909692B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2762275A1 (en) * | 1997-04-18 | 1998-10-23 | Raymond Breton | Electrically operated parking brake on motor vehicle |
| FR2898851B1 (en) * | 2006-03-21 | 2008-06-06 | Peugeot Citroen Automobiles Sa | ELECTRICALLY ASSISTED MANUAL PARKING BRAKE |
| CN104002779A (en) * | 2014-05-30 | 2014-08-27 | 长城汽车股份有限公司 | Electromechanical parking braking mechanism and corresponding vehicle |
-
2018
- 2018-07-27 CN CN201810846189.4A patent/CN108909692B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2762275A1 (en) * | 1997-04-18 | 1998-10-23 | Raymond Breton | Electrically operated parking brake on motor vehicle |
| FR2898851B1 (en) * | 2006-03-21 | 2008-06-06 | Peugeot Citroen Automobiles Sa | ELECTRICALLY ASSISTED MANUAL PARKING BRAKE |
| CN104002779A (en) * | 2014-05-30 | 2014-08-27 | 长城汽车股份有限公司 | Electromechanical parking braking mechanism and corresponding vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108909692A (en) | 2018-11-30 |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210706 |