CN104196929A - Worm and inclined-worm-gear-disc type electronic parking brake - Google Patents

Abstract

The invention discloses a worm helical worm disc type electronic parking brake, comprising an actuating device and a brake caliper assembly, the actuating device includes a housing fixed on the brake caliper body of the brake caliper assembly, A worm helical worm gear transmission mechanism is installed in the housing; wherein the symmetric centerline of the worm gear of the helical worm disc is deflected at a certain angle relative to the axis of the worm gear shaft, and the outer end of the worm gear shaft is inserted into the brake caliper; on one side of the housing is installed a The drive motor is connected with one end of the worm, and the adjusting screw is fixed through a lock nut in a screw hole outside the housing, and the inner end of the adjusting screw is against the upper inner end surface of the inclined worm wheel for transmitting the reaction force of the transmission mechanism. The beneficial effects are: it can reduce the physical exertion of the driver, simplify the parking brake system of the vehicle, realize the gap self-adjustment, deceleration and torque increase, motion conversion function and mechanical reverse self-locking function, and can reduce the power consumption when parking for a long time, and The cost of transformation and processing is low, and the inheritance of the manufacturing process and technological process is good.

Description

Worm Helical Worm Wheel Disc Electronic Parking Brake

technical field

The invention relates to an actuator in a vehicle parking brake system, more precisely, to a worm helical worm wheel disc type electronic parking brake.

Background technique

At present, the traditional vehicle parking brake system mainly implements the parking brake by controlling the mechanical cable through the parking brake handle. The operation is cumbersome, it is difficult to realize the gap self-adjustment, and the safety is low. With the development of automotive electronic technology, automotive control-by-wire technology has appeared in the field of automotive control, and then automotive brake-by-wire technology has emerged. Electronic parking brake system EPB (Electric Park Brake) is a type of automotive brake-by-wire technology.

The electronic parking brake system EPB is mainly composed of the electronic parking brake and the electronic control unit. Among them, the electronic parking brake smoothly converts the rotation of the motor into the translational motion of the brake block. At the same time, it can decelerate and increase the torque to automatically compensate the braking gap caused by long-term work. It is also small in size and compact in structure. It is a very important part of the EPB of the dynamic system.

Existing electronic parking brakes generally include components such as a DC motor, a transmission mechanism (generally consisting of a reduction mechanism and a motion conversion mechanism), a brake caliper, and a brake disc. At present, there are many solutions for deceleration mechanisms. Overseas, there is a planetary gear deceleration mechanism of Trina Corporation of the United States, and domestically, there is a double planetary gear mechanism with a small tooth difference of Zhejiang Asia Pacific Electromechanical Co., Ltd. There are few types of motion conversion mechanisms at present, generally ball screw, screw and nut mechanisms.

Contents of the invention

The purpose of the present invention is to provide a worm helical worm wheel disc type electronic parking brake, which can realize clearance self-adjustment, deceleration and torque increase, motion conversion function and mechanical reverse self-locking function, and the further purpose of the invention is to reduce the physical exertion of the driver , Simplify the parking brake system of the vehicle, reduce the power consumption when parking for a long time, and the cost of transformation and processing is low, and the manufacturing process and process flow are well inherited.

To achieve the above object, the present invention adopts the following technical solutions:

A worm helical worm wheel disc type electronic parking brake, comprising an actuating device and a brake caliper assembly, the actuating device includes:

The housing is fixed on the brake caliper body of the brake caliper assembly at the end away from the brake block;

The transmission mechanism is installed in the housing to push the action of the brake caliper assembly;

The worm is installed on the casing through the bearing seats at both ends, and the main body of the worm is located in the casing;

The inclined worm gear is composed of the worm shaft and the inclined worm disc. The inclined worm disc is located in the housing and the lower part is engaged with the worm. The symmetric center line of the inclined worm disc is deflected by a certain angle α relative to the axis of the worm shaft, which is used for the support of the adjusting screw. The axial movement of the inclined worm wheel is realized; the outer end of the worm gear shaft is inserted into the brake caliper body of the brake caliper assembly, which is used to transmit power to push the brake block on the right side of the brake disc in the brake caliper assembly to move;

The driving motor is installed on one side of the housing through a motor seat cover and connected to one end of the worm to drive the transmission mechanism;

The adjusting screw is screwed into a screw hole on the outside of the housing and fixed by a lock nut. The inner end of the adjusting screw is against the upper inner end surface of the inclined worm wheel for transmitting the reaction force of the transmission mechanism, thereby pushing through the housing. The caliper body of the caliper assembly and the pad located on the left side of the disc move.

As a further preference, the deflection angle α between the symmetrical centerline of the worm wheel and the shaft axis of the worm wheel of the inclined worm wheel is 5-10 degrees.

As a further preference, the driving motor is a DC servo motor and is fixed in the motor seat through a fixed washer, and the output shaft of the driving motor is inserted into one end of the worm and connected through a key.

As a further preference, two positioning sleeves are symmetrically installed on the housing through interference fit, and the housing and the brake caliper body are positioned by the positioning sleeves and fixed by connecting bolts passing through the positioning sleeves.

As a further preference, the brake caliper assembly includes a brake caliper body, a brake caliper bracket, two brake blocks, a piston and a clearance self-adjusting mechanism, and the brake caliper body is symmetrically fixed with two fastening bolts. The guide pin is inserted into the brake caliper bracket through the guide pin; the two brake blocks are respectively stuck on the brake caliper bracket through the stop spring and are located on both sides of the brake disc; the piston and the clearance self-adjusting mechanism Set in the cavity part of the brake caliper body, the outer end surface of the piston is close to the brake block on the same side, the piston is connected with the inner end of the cavity part of the brake caliper body through the gap self-adjusting mechanism, and the worm gear shaft The outer end is inserted into the cavity part of the brake caliper body, and the brake block is pushed through the gap self-adjusting mechanism and the piston in turn to realize braking.

As a further preference, the inner wall of the cavity part of the brake caliper body is provided with a piston sealing ring sleeved on the outer wall of the piston through interference fit, so as to assist the reset of the piston after braking.

As a further preference, the gap self-adjusting mechanism includes a self-adjusting nut assembly and a self-adjusting screw assembly connected by threads.

As a further preference, the self-adjusting nut assembly includes a self-adjusting nut, on which a thrust ball bearing, two flower-shaped sheets with the same structure, a wave elastic sheet and a self-adjusting nut retaining ring are sequentially set, and the self-adjusting nut assembly Clamped in the piston by the self-adjusting nut retainer.

As a further preference, the self-adjusting screw assembly includes a self-adjusting screw, one end of the self-adjusting screw is screwed into the self-adjusting nut, and the other end of the self-adjusting screw is respectively sleeved with a pressure spring, a spring cover and a copper gasket, and the spring cover is On the outside of the pressure spring and stuck in the inner end of the cavity part of the brake caliper body through the elastic ring, the outer end of the worm gear shaft is inserted into the cavity part of the brake caliper body and passed through the copper gasket Against the self-adjusting screw.

As a further preference, in the outer port of the cavity part of the brake caliper body, an O-shaped sealing ring, a spacer and a rubber dust cover which are sleeved on the worm gear shaft are sequentially arranged, and the outer end of the rubber dust cover protrudes The outer port of the cavity part of the brake caliper body is in contact with the end surface of the inclined worm wheel.

The beneficial effects of the present invention are:

1. The worm helical worm wheel disc type electronic parking brake of the present invention replaces the parking brake handle, which further simplifies the control device of the traditional vehicle parking brake system, saves cab space and reduces the driving force. The physical exertion of the driver when parking.

2. Due to the use of the worm helical worm gear meshing transmission mechanism, it has a compact structure and a large transmission ratio, and can simultaneously realize the function of deceleration, torque increase and motion conversion, that is, the rotation of the worm wheel is converted into the translation of the worm shaft, and the transmission is stable and reliable.

3. Due to the use of the worm helical worm gear meshing transmission mechanism, it can realize mechanical reverse self-locking, so it can reduce the power consumption when parking for a long time.

4. Since the present invention is an improved design based on the original disc brake assembly with a parking brake mechanism, it has the function of gap self-adjustment, and the cost of transformation and processing is low, and the manufacturing process and process flow are well inherited.

Description of drawings

Fig. 1 is a structural sectional view of the present invention.

Fig. 2 is a partial cross-sectional view along line A-A of Fig. 1 .

Fig. 3 is an exploded axonometric projection view of the positional relationship between the actuator device and the brake caliper assembly of the present invention.

Fig. 4 is an exploded axonometric projection view of the structural composition of the actuator device of the present invention.

Fig. 5 is an exploded axonometric projection view of the worm helical worm gear transmission mechanism of the present invention.

Figure 6 is an exploded axonometric view of the brake caliper assembly of the present invention.

In the figure: brake caliper body 1, caliper body part 101, cavity part 102, brake block 2, brake disc 3, piston dust cover 4, piston 5, piston sealing ring 6, self-adjusting nut 7, thrust ball Bearing 8, flower-shaped piece 9, wave elastic piece 10, self-adjusting nut retaining ring 11, self-adjusting screw rod 12, large disc 1201, spring cover 13, notch 1301, pressure spring 14, copper gasket 15, O-ring 16, rubber dust cover 17, inclined worm gear 18, inclined worm wheel disc 1801, worm gear shaft 1802, housing 19, lock nut 20, adjusting screw 21, spacer sleeve 22, worm screw 23, circlip 24, bearing seat 25, Bearing sealing ring 26, bearing 27, motor seat cover 28, driving motor 29, shockproof sleeve 30, fixed gasket 31, brake caliper assembly 32, actuator 33, positioning sleeve 34, connecting bolt 35, guide pin 36, Brake caliper bracket 37, screw 38, bolt 39, stop spring 40, fastening bolt 41.

Detailed ways

As shown in FIGS. 1-5 , a worm helical worm wheel disc type electronic parking brake according to the present invention includes an actuating device 33 and a brake caliper assembly 32 . The actuating device 33 includes a housing 19, in which a transmission mechanism for pushing the action of the brake caliper assembly 32 is installed, a driving motor 29 is provided on one side of the housing 19, and a driving motor 29 is arranged on the housing 19. Adjusting screw 21 is arranged.

The housing 19 is an integral structure composed of a hollow box with one side open and a special-shaped flange located on one side of the box opening. The housing 19 is fixed on the brake caliper body 1 of the brake caliper assembly 32. On the end far away from the brake block 2, two positioning sleeves 34 are mounted symmetrically on the special-shaped flange of the housing 19 through interference fit, and the housing 19 and the brake caliper body 1 pass through the positioning sleeves 34. Locate and fix through the connecting bolt 35 passing through the positioning sleeve 34 . The transmission mechanism includes a worm 23 and a helical worm wheel 18. The two ends of the worm 23 are respectively installed in the lower part of the housing 19 through the bearing housing 25 and the bearing 27. The main body of the worm 23 is located in the housing 19, and the bearing housings 25 are respectively inserted It is fixed on the front and rear sides of the housing 19 by bolts 39, and bearing sealing rings 26 are respectively sleeved on the outer sides of the bearings 27 located in the bearing housing 25 at both ends of the worm 23 . Described helical worm gear 18 is to be made up of worm gear shaft 1802 and helical worm wheel disk 1801 that are connected as a whole, and helical worm wheel disk 1801 is positioned at housing 19 and the bottom is meshed with worm screw 23, and the worm gear symmetrical center line of helical worm wheel disk 1801 is relative to worm gear shaft. The axis of 1802 is deflected by a certain angle α. Preferably, the deflection angle α between the symmetric centerline of the worm gear of the inclined worm wheel 1801 and the axis of the worm gear shaft 1802 is 5-10 degrees. An integrated cylindrical boss is provided at the outer end of the inclined worm wheel 1801, and the outer end surface of the cylindrical boss is a vertical plane. The tooth profiles of the helical worm wheel 1801 and the worm 23 both adopt an involute structure, and the normal modulus and normal pressure angle of the helical worm wheel 1801 and the worm 23 are equal, and the lead angle of the worm 23 is the same as that of the helical worm wheel 1801. The helix angles are equal, the direction of rotation of the worm 23 is the same as that of the inclined worm wheel 1801 , and the end modulus of the worm 23 is equal to that of the inclined worm wheel 1801 . In addition, because there is an angle difference between the symmetric centerline of the worm gear 1801 and the rotation axis of the worm shaft 1802 , the centerline of the worm 23 is not on the midline of the worm gear 1801 along the tooth width direction.

The driving motor 29 is fixed on the bearing seat 25 on one side of the housing 19 through a motor seat cover 28 and bolts, and is coaxially connected with one end of the worm 23. The driving motor 29 is a DC servo motor and is passed through a fixed gasket 31 and screw 38 are fixed in the motor seat cover 28, and the drive motor 29 output shafts are inserted in the center hole at one end of the worm screw 23 and are connected by a key for driving the transmission mechanism. A shockproof sleeve 30 is provided between the inner end of the motor seat cover 28 and the drive motor 29 to protect the motor.

The adjusting screw 21 is screwed into a screw hole on the upper part of the outer side of the housing 19 and fixed by a lock nut 20. A countersunk hole is provided on the outer side of the housing 19 corresponding to the screw hole, and the adjusting screw 21 is located in the countersink hole. And the inner end is semi-spherical, it is screwed into the housing 19 and leans against the inner end surface of the inclined worm wheel 1801, and the axial installation position of the adjusting screw 21 can be adjusted by the lock nut 20, which is used to transmit the transmission mechanism. The reaction force pushes the brake caliper body 1 of the brake caliper assembly 32 and the brake block 2 on the left side of the brake disc 3 to move through the housing 19 .

As shown in Figure 1, Figure 3 and Figure 6, the brake caliper assembly 32 is a floating caliper disc brake commonly used in existing cars, and it can also be used as a parking brake while serving as a service brake actuator. executive body. The brake caliper assembly 32 includes a brake caliper body 1, a brake caliper bracket 37, two brake blocks 2, a piston 5 and a gap self-adjusting mechanism. Wherein the brake caliper bracket 37 is fixed on the steering knuckle of the vehicle steering system through two bolt holes on both sides of its lower end through bolts, and the brake caliper body 1 is composed of a caliper body part 101 and a cavity part 102 Two guide pins 36 are symmetrically fixed on both sides of the caliper body part 101 at the upper end of the brake caliper body 1 through fastening bolts 41, and are respectively inserted into two corresponding plugs at the upper end of the brake caliper bracket 37 through the guide pins 36. In the hole and for sliding fit, the brake caliper body 1 can slide axially along the guide pin 36. The two brake blocks 2 are respectively stuck on the brake caliper bracket 37 by the stop spring 40 and are located on both sides of the brake disc 3, so that the brake blocks 2 can move axially but cannot move up and down, left and right. The caliper body part 101 of the movable caliper body 1 is provided with an integral trapezoidal boss corresponding to one end of the brake block 2, and is attached to the outer side of the brake block 2 on the left side of the brake disc 3 through the trapezoidal boss. The piston 5 and the gap self-adjusting mechanism are arranged in the cavity part 102 of the brake caliper body 1, the outer end surface of the piston 5 is close to the brake block 2 on the same side, and the piston 5 is connected to the brake caliper through the gap self-adjusting mechanism. The inner end of the cavity part 102 of the body 1 is connected, and the outer end of the worm gear shaft 1802 is inserted into the cavity part 102 of the brake caliper body 1, and the brake block 2 is pushed through the gap self-adjusting mechanism and the piston 5 to realize braking.

As shown in Figure 1, two annular grooves are arranged on the inner wall of the cavity part 102 of the brake caliper body 1 near its inner port, and the piston sealing ring 6 and The piston dust cover 4, the piston sealing ring 6 is sleeved on the outer wall of the piston 5 through an interference fit, so as to help the piston 5 reset after braking. The piston dust cover 4 is made of rubber material and is located outside the piston sealing ring 6 and stuck on the outer end of the piston 5 .

As shown in Figure 1 and Figure 6, the gap self-adjusting mechanism includes a self-adjusting nut assembly and a self-adjusting screw assembly connected by threads. The self-adjusting nut assembly includes a self-adjusting nut 7, the outer wall of the self-adjusting nut 7 is a stepped cylinder and the diameter of the annular boss located in the middle is greater than the outer diameter of the cylindrical section on both sides, and the annular boss of the self-adjusting nut 7 Six through holes are evenly distributed along the circumferential direction on the shaft shoulder to facilitate the flow of brake fluid during service braking. A thrust ball bearing 8, two flower-shaped pieces 9 with the same structure, a wave-shaped elastic piece 10 and a self-adjusting nut retaining ring 11 are sequentially set on the outer side of the annular boss located in the middle of the self-adjusting nut 7, and the wave-shaped elastic piece 10 is clamped on the Between the two flower-shaped pieces 9, the self-adjusting nut assembly is stuck in the stepped hole of the piston 5 through the self-adjusting nut retaining ring 11, and is processed between the annular boss of the self-adjusting nut 7 and the stepped edge of the inner hole of the piston 5 There are conical surfaces that cooperate with each other to ensure that the axial movement of the self-adjusting nut 7 is transmitted to the piston 5 .

The flower-shaped sheet 9 is an annular thin sheet with six grooves uniformly processed along the circumferential direction, so as to transmit the force received by the self-adjusting nut retaining ring 11 stuck in the inner groove of the piston 5 to the wave elastic sheet 10. And self-adjusting nut 7, does not hinder the flow of hydraulic oil when service braking again. The corrugated elastic piece 10 is an annular thin piece and a circle of arc protrusions is stamped out, which can produce axial deformation.

The self-adjusting screw assembly includes a self-adjusting screw 12, one end of the self-adjusting screw 12 is processed with an external thread and screwed into the self-adjusting nut 7, and the other end of the self-adjusting screw 12 is respectively equipped with a pressure spring 14, a spring cover 13 and a copper pad Sheet 15, the spring cover 13 is in the shape of a cup and sleeved on the outside of the pressure spring 14, and one end of the cup of the spring cover 13 is stuck in the inner end of the cavity part 102 of the brake caliper body 1 through the circlip 24 , the other end of the self-adjusting screw 12 is provided with an integrated large disk 1201, the large disk 1201 is inserted into the spring cover 13 and snapped into the spring cover symmetrically provided on the spring cover through the boss symmetrically arranged on its outer edge. 13 cup along the notch 1301 on one end cylinder wall, the length of the notch 1301 is greater than the thickness of the boss, the pressure spring 14 is stuck between the bottom of the cup of the spring cover 13 and the large disc 1201 between. The copper washer 15 is sleeved on the central shaft head of the other end of the self-adjusting screw 12, and the outer end of the worm gear shaft 1802 is passed through the housing 19 and inserted into the cavity part 102 of the brake caliper body 1 And through the copper gasket 15 against the self-adjusting screw rod 12, it is used to transmit power to push the brake block 2 located on the right side of the brake disc 3 in the brake caliper assembly 32 to act.

As shown in Figure 1, an O-ring 16, a spacer 22 and a rubber dustproof cover 17 for being sleeved on the worm gear shaft 1802 are sequentially arranged in the outer port of the cavity part 102 of the brake caliper body 1, so that The outer end of the rubber dust cover 17 protrudes from the outer port of the cavity part 102 of the brake caliper body 1 and contacts the end surface of the cylindrical boss of the inclined worm gear disc 1801, and the outer end of the worm gear shaft 1802 passes through the rubber dustproof cover in turn. The cover 17 , the spacer 22 and the O-ring 16 lean against the copper gasket 15 behind.

When the parking brake is not applied, the meshing area between the worm screw 23 and the inclined worm wheel 1801 is at the right end of the center line of the worm screw 23 . During the parking brake, the drive motor 29 drives the worm 23 to rotate, and the worm 23 transmits the torque to the inclined worm disc 1801 through engagement with the inclined worm disc 1801. Due to the inclination of the symmetrical center line of the inclined worm disc 1801, the inclined worm disc 1801 While rotating around the axis of the worm gear shaft 1802 , under the contact limit of the adjusting screw 21 , the inclined worm wheel disc 1801 will axially move to the left. The meshing area of the inclined worm wheel disc 1801 and the worm screw 23 also moves to the left along the line direction of the worm wheel shaft 1802, and keeps meshing transmission all the time. Further, the inclined worm wheel 1801 pushes the copper washer 15, the self-adjusting screw 12, the self-adjusting nut 7 and the piston 5 to move to the left through the worm shaft 1802 in turn, and finally pushes the brake block 2 on the right side of the brake disc 3 to move to the left to approach the brake. disc 3; at the same time, since the symmetric center line of the worm wheel of the inclined worm wheel disc 1801 deflects at a certain angle relative to the axis of the worm wheel shaft 1802, the brake caliper body 1 is pushed to the right by the adjustment screw 21 while the inclined worm wheel disc 1801 rotates, and passes The trapezoidal boss on the caliper body part 101 drives the brake block 2 on the left side of the brake disc 3 to move rightward to approach the brake disc 3, thereby generating braking force.

When the brake is released, the drive motor 29 reverses to drive the worm 23 to rotate in the opposite direction. Similarly, the meshing area between the helical worm wheel 1801 and the worm 23 moves to the right, and the worm shaft 1802 of the helical worm wheel 18 no longer pushes the gap self-adjusting mechanism, and then the pressure Under the action of the spring 14, the gap self-adjusting mechanism is moved to the right and resets. When the self-adjusting nut 7 returns to its original position, the wave elastic sheet 10 can play a buffering and damping effect, thereby reducing noise; Deformation when moving, this moment just restores original shape, piston 5 is returned, and brake caliper assembly 32 releases braking, and the brake block 2 that is positioned at brake disc 3 both sides resets under the effect of stop spring 40 respectively. Since the braking clearance of a general disc brake is about 0.2 mm, the difference between the symmetric center line of the worm wheel in the inclined worm wheel 1801 and the axis of the worm shaft 1802 within 10 degrees can ensure that the inclined worm wheel 1801 rotates no more than 120 degrees. The axial displacement of the worm wheel disc 1801 can meet the braking requirement.

If the brake block 2 wears and produces a small amount of excess clearance during use, the piston 5 will slide a certain distance to the left relative to the piston sealing ring 6 during braking. Since the self-adjusting nut assembly and the piston 5 cannot be separated by being integrated, so At this time, the self-adjusting nut 7 will move forward by the same distance with the self-adjusting screw rod 12 through the thread relative rotation under the action of the thrust ball bearing 8, thereby realizing the automatic adjustment of the braking clearance.

Although the embodiment of the present invention has been disclosed as above, it is not limited to the use listed in the specification and implementation, it can be applied to various fields suitable for the present invention, and it can be easily understood by those skilled in the art Therefore, the invention is not limited to the specific details and examples shown and described herein without departing from the general concept defined by the claims and their equivalents.

Claims (10)

1. the oblique worm gear disc type of a worm screw electric parking brake, comprises actuation gear and brake caliper assy, it is characterized in that: described actuation gear comprises:

Housing, is fixed on the braking clamp body of brake caliper assy away from brake slipper one end;

Driving mechanism, is arranged in housing for promoting brake caliper assy action;

Worm screw, is arranged on housing by the bearing support at its two ends, and worm screw main body is positioned at housing;

Tiltedly worm gear, formed by worm-wheel shaft and oblique worm gear dish, tiltedly worm gear dish is positioned at housing and bottom and worm meshing, and tiltedly the worm wheel symmetrical center line of worm gear dish is with respect to the axis tilt several angle α of worm-wheel shaft, for realize moving axially of oblique worm gear under the support of adjusting screw; Worm-wheel shaft outer end is inserted in the braking clamp body of brake caliper assy, promotes to be positioned in brake caliper assy the brake slipper action on brake disc right side for transferring power;

Drive motor, is arranged on housing one side by a motor cover for seat, and is connected with worm screw one end, moves for drive transmission device;

Described adjusting screw screws in hull outside one screw and fixes by lock-nut, adjusting screw the inner leans the interior edge face top of described oblique worm gear dish, for transmitting the reaction force of driving mechanism, thereby promotes the braking clamp body of brake caliper assy and the brake slipper that is positioned on the left of brake disc moves by housing.

2. the oblique worm gear disc type of worm screw according to claim 1 electric parking brake, is characterized in that: the deflection angle α between worm wheel symmetrical center line and the worm-wheel shaft axis of described oblique worm gear dish is 5-10 degree.

3. the oblique worm gear disc type of worm screw according to claim 1 and 2 electric parking brake, it is characterized in that: described drive motor is DC servo motor and is fixed in motor cover for seat by a retaining washer, drive motor output shaft inserts worm screw one end and also connects by key.

4. the oblique worm gear disc type of worm screw according to claim 1 electric parking brake, it is characterized in that: on described housing, be symmetrically installed with two setting sleeves by interference fit, described housing and described braking clamp body are located by setting sleeve and be affixed by running through the attachment bolt of setting sleeve.

5. according to the oblique worm gear disc type of the worm screw described in claim 1 or 4 electric parking brake, it is characterized in that: described brake caliper assy comprises described braking clamp body, brake-caliper support, two brake slipper, piston and clearance self-regulating mechanisms, described braking clamp body is symmetrically fixed with two guide fingers by clamping bolt, and pegs graft by guide finger and brake-caliper support; Described two brake slipper are stuck on brake-caliper support by stopper spring respectively and are positioned at brake disc both sides; Described piston and clearance self-regulating mechanism are located in the cavity part of braking clamp body, the brake slipper of homonymy is close in described piston exterior edge face, piston is connected with the cavity part inner end of braking clamp body by clearance self-regulating mechanism, in the cavity part of described worm-wheel shaft outer end insertion braking clamp body and successively, is realized and being braked by clearance self-regulating mechanism and piston promotion brake slipper.

6. the oblique worm gear disc type of worm screw according to claim 5 electric parking brake, is characterized in that: be provided with one at the cavity part inwall of described braking clamp body and be enclosed within the piston packing on piston outer wall by interference fit, to reset after auxiliary piston braking.

7. according to the oblique worm gear disc type of the worm screw described in claim 5 or 6 electric parking brake, it is characterized in that: described clearance self-regulating mechanism comprises the self-regulated nut assembly and the self-regulated screw arbor assembly that are threaded connection.

8. the oblique worm gear disc type of worm screw according to claim 7 electric parking brake, it is characterized in that: described self-regulated nut assembly comprises self-regulated nut, on self-regulated nut, be set with successively thrust ball bearing, two colored shape sheet, waveform elastic sheet and self-regulated nut back-up rings that structure is identical, described self-regulated nut assembly is stuck in piston by self-regulated nut back-up ring.

9. according to the oblique worm gear disc type of the worm screw described in claim 7 or 8 electric parking brake, it is characterized in that: described self-regulated screw arbor assembly comprises self-regulated screw rod, self-regulated screw rod one end screws in self-regulated nut, be respectively installed with pressure spring, spring shield and copper backing at the self-regulated screw rod the other end, described spring shield is enclosed within the outside of pressure spring and is stuck in the cavity part inner end of described braking clamp body by circlip, and described worm-wheel shaft outer end is inserted in the cavity part of described braking clamp body and leans self-regulated screw rod by copper backing.

10. according to the oblique worm gear disc type of the worm screw described in claim 1 or 6 electric parking brake, it is characterized in that: in the cavity part external port of described braking clamp body, be provided with successively the O RunddichtringO, spacer and the bellows that are enclosed within on worm-wheel shaft, described bellows outer end protrude from the cavity part external port of braking clamp body and with oblique worm gear dish end contact.