CN202138365U

CN202138365U - Electric parking brake

Info

Publication number: CN202138365U
Application number: CN201120202960U
Authority: CN
Inventors: 邱文彬
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-06-16
Filing date: 2011-06-16
Publication date: 2012-02-08
Anticipated expiration: 2021-06-16

Abstract

The utility model relates to a parking brake, particularly to an electric parking brake capable of being controlled by an electric method, comprising a drive motor, a worm wheel-worm mechanism, a screw and two switches, wherein the output shaft of the drive motor is coaxially fixed with a worm, and a worm wheel is engaged with the worm; the screw is penetrated in an internal thread hole at the axes of the worm wheel and engaged with the internal thread hole; the tail end of one side of the screw is fixedly connected with the inner core of a brake guy wire; and the two switches are triggered or released at a release position and a brake position of the screw respectively. The electric parking brake disclosed by the utility model converts the power output by the drive motor to the parallel movement of the screw, and tensions the brake guy wire via the screw to achieve the purpose of parking and braking, with a simple structure and a uniform braking force. Additionally, via an automatic adjusting device, the free stroke of the brake guy wire is automatically adjusted after the phenomenon that the brake guy wire is loosened to extend, so as to reduce the times of maintenance for the parking brake.

Description

Electric parking brake

Technical field

The utility model relates to a kind of Parking Brake, is specifically related to a kind of electric parking brake that can adopt electronic mode to control.

Background technology

Parking Brake on the existing automobile, the overwhelming majority adopts manual manipulation mode, promptly directly or indirectly spurs the brake backguy through handle; So be commonly referred to as hand brake device; More laborsaving in order to operate, produced the hand brake device of electronic control, be in the utility model patent of ZL 200520129722.3 like the patent No.; A kind of electric hand brake device is disclosed; Make drive motor get the electrician through the control electric-controlled switch and do, drive driving device tension brake backguy, thereby realize braking during standstill and release function through hand switch.

Yet, in original electric hand brake device, through motor-driven turbine and worm mechanism, again through the said brake backguy of the drive of connecting rod and pull bar campaign, mechanism's more complicated, and also said pull bar receives connecting rod to rotate the influence of tractive angle, and the pulling force size is also inhomogeneous.In addition, original electric hand brake device the lax extension of brake backguy often occurs in use for some time; Play motion is long, causes braking not in place, has only the maintenance through the maintainer; Again regulate brake backguy length, could guarantee the tightening force of brake backguy.

The utility model content

The utility model has overcome above-mentioned shortcoming, and a kind of electric parking brake simple in structure, easy and simple to handle is provided.

The technical scheme that its technical matters of the utility model solution is taked is: a kind of electric parking brake; Comprise drive motor, turbine and worm mechanism, screw rod and two switches; The output shaft of said drive motor is coaxial fixing with worm screw, and worm gear is meshed with said worm screw, and said screw rod passes in the internal thread hole in said worm gear axle center; And be meshed with said internal thread hole; The terminal inner core with the brake backguy of one side of said screw rod is captiveed joint, and at the releasing position and the braking position of said screw rod, touches or discharge said two switches respectively.

The opposite side end of said screw rod is fixed with the end cap of an external diameter greater than said worm screw external diameter, and a switch is installed between the side of said end cap and worm gear; Opposite side at said worm gear; The outside of said screw rod is set with a sleeve pipe; The end of said sleeve pipe is captiveed joint with the crust of said brake backguy, and a piston cylinder that fixedly installs is installed in the outside of said sleeve pipe, is provided with spring and piston in the said piston cylinder; The position relative fixed of said piston and said sleeve pipe also is provided with said another switch in piston cylinder.

Said switch adopts travel switch or micro-switch.

Also comprise self-reacting device, said self-reacting device comprises an annular brace platform, two tabs and a door; Said tabs has at least two ratchets that stretch out to the center; And the end of said ratchet is bent to a lateral bending of tabs, and said annular brace platform is fixed on the opposite side of said worm gear, and the end near worm gear of said sleeve pipe is fixed with a door; One of them tabs closely is sleeved on the said screw rod; And between said annular brace platform and door, the end of ratchet is crooked towards the worm gear direction, and another tabs and said piston are fixed; Said another tabs closely is sleeved on the lateral wall of said sleeve pipe, and the end of ratchet a lateral bending of said piston is bent dorsad.

The braking position direction outside of said screw rod also is provided with a limit travel switch.

Said screw rod adopts the left and right sides to have outside thread, and both sides are the cross section structure on plane up and down.

The utility model is that the parallel of screw rod moved with the power conversion of drive motor output, strains said brake backguy through screw rod, reaches the purpose of stopping brake, and simple in structure, braking force is even.In addition, through said self-reacting device, after the lax extension phenomenon of brake backguy occurring, automatically regulating brake backguy play motion reduces the number of times to the maintenance of Parking Brake.

Description of drawings

Fig. 1 is the drive motor of the utility model and the structural representation of transmission device part;

Fig. 2 is in the structural representation of releasing position for the utility model;

Fig. 3 is in the structural representation of braking position for the utility model;

Fig. 4 is the front view of tabs 19;

Fig. 5 be among Fig. 2 A-A to cutaway view;

Fig. 6 be among Fig. 2 B-B to cutaway view.

The specific embodiment

As shown in fig. 1, adopt drive motor 1 to drive whole device operation in the utility model, the output shaft of said drive motor 1 is coaxial fixing with worm screw 2, and worm gear 3 is meshed with said worm screw 2, and is installed on the shell 15.

Like Fig. 2,3, shown in 5, the axle center of said worm gear 3 is that 4, one screw rods 5 of internal thread hole pass in the said internal thread hole 4, and is meshed with it.In a side of said worm gear 3, the end of said screw rod 5 is fixed with an external diameter and is installed between said end cap 6 and the turbine 3 greater than 6, one travel switches 7 of end cap of said worm screw 5 external diameters, is used to detect the releasing position of said screw rod 5; Opposite side at said worm gear 3; The outside of said screw rod 5 is set with a sleeve pipe 9, and the inner core 10 of original brake backguy is captiveed joint on the end of said screw rod 5 and the automobile, and the end of said sleeve pipe 9 is captiveed joint with the crust 11 of said brake backguy; A piston cylinder that fixedly installs 12 is installed in the outside of said sleeve pipe 9; Said piston cylinder 12 can be directly fixing with other fixed partss of car body, is provided with spring 13 and piston 14 in the said piston cylinder 12, and said piston 14 keeps relative fixed with the position of said sleeve pipe 9; In piston cylinder 12, also be provided with a micro-switch 16, be used for the braking position of detecting device.

When the utility model is in the releasing position; In Fig. 2, because the position of said worm gear 3 is fixing by shell 15, said screw rod 5 and sleeve pipe 9, piston 14 common points are in the low order end position; At this moment; Said end cap 6 is pushed on travel switch 7, and spring 13 is in release position, the said micro-switch 16 of the lateral wall roof pressure of said piston.

When the needs glancing impact, start 1 operation of said drive motor through electric-controlled switch after, the output shaft of said drive motor 1 rotates and drives worm screw 2 and rotates synchronously, and then drives worm gear 3 rotations; At this moment, said screw rod 5 is under the drive of worm gear 3 rotations, and right-to-left is parallel to be moved; End cap 6 at first leaves travel switch 7, and promptly screw rod 5 leaves the releasing position, continues in the process of left at said screw rod 5; Pulling brake backguy is strained the brake backguy also to left, reaches the purpose of braking during standstill; Said screw rod 5 also drives piston 14 simultaneously also to left, and extrusion spring 13, discharges the roof pressure to micro-switch 16 up to piston 14, and it is out of service to control said drive motor 1.This moment, said screw rod 5, sleeve pipe 9 and piston 14 moved to the high order end position, and promptly as shown in Figure 3, the brake backguy is in tension, and the utility model is in braking position.

When needs discharge again; Start drive motor 1 counter-rotating operation, said screw rod 5 drives sleeve pipe 9 and moves right with piston 14, again the said micro-switch 16 of roof pressure; Said screw rod 5 continues to right translation; Again refund the low order end position to Fig. 2, again by being pressed on the said travel switch 7, drive motor 1 is out of service until said end cap 6.

The utility model also comprises a self-reacting device, and said self-reacting device comprises annular brace platform 8,

tabs

18,19 and door 17.The opposite side of said worm gear 3 is fixed with an annular brace platform 8, and the end near worm gear 3 of said sleeve pipe 9 is fixed with a door 17; A tabs 19 closely is sleeved on the said screw rod 5; And between annular brace platform 8 and door 17, said tabs 19 as shown in Figure 4, inner edge has two ratchets 191 that stretch out to the center; The number of said ratchet 191 is two; And the end of ratchet 191 is bent to the lateral bending towards worm gear 3 of said tabs 19, and through the outer wall of the said screw rod 5 of 191 clampings of the ratchet on the said tabs, making can only have relatively moving of a direction between screw rod 5 and the tabs.Another tabs 18 is fixed with said piston 14; Said another tabs 18 closely is sleeved on the lateral wall of said sleeve pipe 9; As shown in Figure 6; Said tabs 18 has three tabs 181 of stretching out to the center, and the end of tabs 18 is bent to a lateral bending of the piston dorsad 14 of said tabs 18, makes said tabs 18 with sleeve pipe 9 relatively moving of a direction can only be arranged.

When drg uses a period of time, occur that the brake backguy is lax extends, after the long phenomenon of play motion; In braking procedure, when screw rod 5 is moved to the left the high order end position, because the play motion that increases; Also continue to be moved to the left a micro displacement, at this moment, said tabs 19 is under the supporting role of annular brace platform; Produced a micro-displacement to the right with respect to said screw rod 5, and then also produced a micro-displacement to the right, simultaneously in this through said door 17 promotion sleeve pipes 9; Said sleeve pipe 9 also produces a micro-displacement to the right with respect to said another tabs 18 with said tabs 18 piston fixed 14, because

tabs

19 and 18 can only have the relative displacement of a direction respectively with respect to clamped screw rod 5 and sleeve pipe 9; After coming back to release; Said

tabs

19 and 18 also no longer is returned to the position before the braking, even the brake backguy is lax like this, through said self-reacting device the play motion that increases is pulled out left gradually; And that the relative distance of said worm gear 3 and piston 14 also can remain is constant, and then has guaranteed the pulling force of brake backguy under the braking mode.

The high order end of said screw rod 5, promptly the braking position direction outside also is provided with a limit travel switch 20; Said limit travel switch 20 can fix with vehicle body; After self-reacting device micro-displacement accumulative total repeatedly reached the displacement of a setting, the end cap on said screw rod 5 tops touched said limit travel switch 20, can cause warning; And then prompting brake backguy is too lax, needs to change or repair.

Said screw rod 5 can adopt the externally threaded long rod structure of having of a standard; Also can adopt shown in Fig. 2～6, the left and right sides has outside thread, and both sides are the cross section structure on plane up and down; Like this; Through the structure that said internal thread hole 4 also is designed to adapt, can better fix said screw rod 5 position diametrically, guarantee that screw rod 5 steadily moves on axis.

More than the electric parking brake that the utility model provided has been carried out detailed introduction; Used concrete example among this paper the principle and the embodiment of the utility model are set forth, the explanation of above embodiment just is used to help to understand the method and the core concept thereof of the utility model; Simultaneously, for one of ordinary skill in the art, according to the thought of the utility model, the part that on the specific embodiment and field of application, all can change, in sum, this description should not be construed as the restriction to the utility model.

Claims

1. electric parking brake is characterized in that: comprise drive motor, turbine and worm mechanism, screw rod and two switches, the output shaft of said drive motor is coaxial fixing with worm screw; Worm gear is meshed with said worm screw; Said screw rod passes in the internal thread hole in said worm gear axle center, and is meshed with said internal thread hole, and the terminal inner core with the brake backguy of a side of said screw rod is captiveed joint; At the releasing position and the braking position of said screw rod, touch or discharge said two switches respectively.

2. electric parking brake according to claim 1 is characterized in that: the opposite side end of said screw rod is fixed with the end cap of an external diameter greater than said worm screw external diameter, and a switch is installed between the side of said end cap and worm gear; Opposite side at said worm gear; The outside of said screw rod is set with a sleeve pipe; The end of said sleeve pipe is captiveed joint with the crust of said brake backguy, and a piston cylinder that fixedly installs is installed in the outside of said sleeve pipe, is provided with spring and piston in the said piston cylinder; The position relative fixed of said piston and said sleeve pipe also is provided with said another switch in piston cylinder.

3. electric parking brake according to claim 2 is characterized in that: said switch adopts travel switch or micro-switch.

4. electric parking brake according to claim 2 is characterized in that: also comprise self-reacting device, said self-reacting device comprises an annular brace platform, two tabs and a door; Said tabs has at least two ratchets that stretch out to the center; And the end of said ratchet is bent to a lateral bending of tabs, and said annular brace platform is fixed on the opposite side of said worm gear, and the end near worm gear of said sleeve pipe is fixed with a door; One of them tabs closely is sleeved on the said screw rod; And between said annular brace platform and door, the end of ratchet is crooked towards the worm gear direction, and another tabs and said piston are fixed; Said another tabs closely is sleeved on the lateral wall of said sleeve pipe, and the end of ratchet a lateral bending of said piston is bent dorsad.

5. electric parking brake according to claim 4 is characterized in that: the braking position direction outside of said screw rod also is provided with a limit travel switch.

6. according to each described electric parking brake in the claim 1～5, it is characterized in that: said screw rod adopts the left and right sides to have outside thread, and both sides are the cross section structure on plane up and down.