CN204041784U - Worm gear ball wedge disc type electric parking brake - Google Patents

Worm gear ball wedge disc type electric parking brake Download PDF

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Publication number
CN204041784U
CN204041784U CN201420476969.1U CN201420476969U CN204041784U CN 204041784 U CN204041784 U CN 204041784U CN 201420476969 U CN201420476969 U CN 201420476969U CN 204041784 U CN204041784 U CN 204041784U
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China
Prior art keywords
self
worm
regulated
worm gear
brake
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Expired - Fee Related
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CN201420476969.1U
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Chinese (zh)
Inventor
王军年
魏武
李修森
闫佳伟
佟静
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Jilin University
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Jilin University
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Expired - Fee Related legal-status Critical Current
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Abstract

The utility model discloses a kind of Worm gear ball wedge disc type electric parking brake, comprise actuation gear and brake caliper assy, described brake caliper assy comprises and is located at push-rod assembly in the cavity of braking clamp body and piston assembly, and push-rod assembly comprises wedge dish, ball, push rod shaft, self-regulated screw rod, pressure spring and spring retainer cover; Push rod shaft is passed by cavity and is connected with the driving mechanism of actuation gear; Ball is multiple and is uniformly clamped between push rod shaft and wedge dish, for generation of end thrust; Self-regulated screw rod is connected with the self-regulated nut thread of piston assembly; Actuation gear comprises housing, driving mechanism and drive motor.The beneficial effects of the utility model are: this break can reduce driver's physical output, simplify park braking system for automobile, be convenient to realize clearance self-regulating, deceleration increasing turned round, motion conversion function and the reverse auto-lock function of machinery, reduce power consumption during long-time parking, and it is low to transform processing cost, manufacture process and technological process inheritance good.

Description

Worm gear ball wedge disc type electric parking brake
Technical field
The utility model relates to the actuator in a kind of park braking system for automobile, and or rather, the utility model is in particular to a kind of Worm gear ball wedge disc type electric parking brake.
Background technique
Current conventional truck parking braking system controls the form of mechanical drag-line to implement parking braking mainly through parking brake handle grip, although structure is simple, cost is low, but there is many shortcomings, such as consume driver's muscle power, uphill starting complex operation, be difficult to realize clearance self-regulating, Security is lower.Along with the development of automotive electronic technology, there is X-by-wire on Automobile in field of automobile control, and then occur Automotive By-Wire Control Technology.Electronic brake system EPB (Electric Park Brake) is a class of Automotive By-Wire Control Technology.
Electronic brake system EPB forms primarily of electric parking brake and electronic control unit.Wherein electric parking brake is converted into the translation of brake slipper the stability of rotation of motor, can be slowed down the brake clearance that increasing is turned round, auto-compensation produces due to long-term work simultaneously, and volume is little, compact structure, it is very important constituent element in whole electronic brake system EPB.
Existing electric parking brake generally comprises the parts such as direct current generator, reducing gear, movement conversion mechanism, braking brake pad and brake disc.The solution of current movement conversion mechanism is less, mainly contains ball screw, bolt and nut mechanism etc.
Summary of the invention
The purpose of this utility model is to provide a kind of Worm gear ball wedge disc type electric parking brake, this break is convenient to realize clearance self-regulating, deceleration increasing is turned round, motion conversion function and the reverse auto-lock function of machinery, further goal of the invention to reduce driver's physical output, simplify park braking system for automobile, power consumption during long-time parking can be reduced, and it is low to transform processing cost, manufacture process and technological process inheritance good.
For achieving the above object, the utility model adopts following technological scheme:
A kind of Worm gear ball wedge disc type electric parking brake, comprises actuation gear and brake caliper assy, and described brake caliper assy comprises and is located at push-rod assembly in the cavity of braking clamp body and piston assembly;
Described push-rod assembly comprises the wedge dish be located at successively in described cavity, ball, push rod shaft, self-regulated screw rod, pressure spring and spring retainer cover;
Described spring retainer cover be enclosed within described pressure spring, self-regulated screw rod, push rod shaft and wedge dish outside and bottom the cavity endoporus being stuck in described braking clamp body by interior jump ring, for realizing the spacing of push-rod assembly;
Described push rod shaft is ladder shaft-like and miner diameter end is passed by described cavity and is connected with the driving mechanism of actuation gear, for transmitting torque; Described ball is multiple and is uniformly clamped between push rod shaft and wedge dish, produces end thrust for making during push rod shaft rotation brake; The miner diameter end of described self-regulated screw rod overlaps bottom by spring retainer and passes and be connected with the self-regulated nut thread of described piston assembly, realizes clearance self-regulating for transferring axial thrust;
Described actuation gear comprises:
Housing, is fixed on described braking clamp body away from brake slipper one end;
Driving mechanism, it is Worm and worm-wheel gearing and is arranged in housing, drives described push rod shaft to rotate for transmitting torque;
Drive motor, is arranged on housing side by a motor cover for seat, and is connected with worm screw one end of driving mechanism, for drive transmission device action.
As preferred further, described self-regulated screw rod is ladder shaft-like, and its one end, large footpath, near described push rod shaft, one end, large footpath spindle nose of self-regulated screw rod is set with copper backing, copper backing is clamped between self-regulated screw rod and push rod shaft, to reduce the spin friction resistance of self-regulated screw rod to push rod shaft.
As preferred further, described wedge dish is annular slice and is fixed on bottom the endoporus of described cavity, its corresponding ball one side end face is along the circumferential direction evenly equipped with multiple scalloped recess, and when the degree of depth of scalloped recess is braked along push rod shaft, relative sense of rotation shoals gradually; On the shaft shoulder of the corresponding wedge dish side of push rod shaft along the circumferential direction uniform hemispherical dimples, pit is equal with ball quantity with described scalloped recess one_to_one corresponding, and described ball lays respectively between corresponding pit and scalloped recess, for generation of end thrust.
As preferred further, described spring retainer cover is provided with the cup-shaped of through hole for bottom, its endoporus and outer wall are stepped, be arranged with along its axial arranged rectangle gap at spring retainer cover middle part, one end, large footpath outer wall of self-regulated screw rod is arranged with the rectangular boss snapped in respectively in rectangle gap, to limit the circular-rotation of self-regulated screw rod, thus guarantee to realize clearance self-regulating.
As preferred further, described driving mechanism comprises intermeshing worm gear and worm screw, described worm gear is made up of worm-wheel shaft and worm gear dish, and it is inner that its worm-wheel shaft one end is arranged on described housing by bearing, and the other end is arranged on corresponding housing one end on braking clamp body by bearing; Described worm gear dish is fan-shaped, and central angle corresponding to its worm-gear tooth part is 90 degree.
As preferred further, described push rod shaft and described worm-wheel shaft are by the coaxial grafting of spline.
As preferred further, described drive motor is DC servo motor and is fixed in motor cover for seat by a supporting disk, and drive motor output shaft is inserted worm screw one end of driving mechanism and connected by key.
As preferred further, it is affixed that described housing and braking clamp body pass through multiple connecting bolt, opposing end surface between housing and braking clamp body is respectively equipped with the circular orientation boss and positioning groove that cooperatively interact, to guarantee the connection coaxiality of housing and braking clamp body.
As preferred further, rotate extreme position in the braking of described inner walls side corresponding driving mechanism worm gear dish and be provided with a position limit pin, to guarantee when drive motor parking moment reaches maximum value, limit the maximum angle of swing of worm gear, avoid occurring causing the phenomenon of transmission failure to occur when brake slipper excessive abrasion rear worm wheel worm screw departs from engagement.
As preferred further, described piston assembly comprises the piston be slidably matched with cavity, described inside brake block is close in piston exterior edge face, dust-proof cover and piston packing is provided with between piston and described cavity, self-regulated nut is fitted with in the shoulder hole of piston, self-regulated nut is set with thrust ball bearing successively, the colored shape sheet that two structures are identical, waveform elastic sheet and self-regulated nut back-up ring, described self-regulated nut, thrust ball bearing, flower shape sheet and waveform elastic sheet are stuck in piston by self-regulated nut back-up ring, to eliminate brake noise, avoid colliding between self-regulated nut and piston.
As preferred further, described braking clamp body is symmetrically fixed with two guide fingers by clamping bolt, and by guide finger and brake-caliper support grafting; Described two brake slipper to be stuck on brake-caliper support respectively by stopper spring and to be positioned at brake disc both sides.
As further preferably, be provided with successively in the bottom outlet that described cavity correspondence passes push rod shaft and be enclosed within supporting sleeve in push rod shaft and O RunddichtringO, to realize support to push rod shaft and sealing.
The beneficial effects of the utility model are:
1, Worm gear ball wedge disc type electric parking brake described in the utility model makes parking brake handle grip replaced, simplified further relative to conventional truck parking braking system control gear, save cab space, reduce physical output during driver's parking.
2, owing to adopting Worm and worm-wheel gearing, compared with the electric parking brake of other types its compact structure, stable drive, bearing capacity strong, realize alternating axis transmission and reduce break axial dimension; Adopt ball wedge disc mechanism to be straight line motion by convert rotational motion, structure is simplified greatly, can brake noise be eliminated simultaneously, realize clearance self-regulating.
3., owing to adopting Worm and worm-wheel gearing, therefore can realize reverse self-locking, therefore power consumption when can reduce long-time parking.
4, Worm gear ball wedge disc type electric parking brake described in the utility model adds new structure Curve guide impeller on the disk brake assembly of tradition with parking and braking mechanism, compared with the electric parking brake of other types, its transformation processing cost low, manufacture process and technological process inheritance good.
Accompanying drawing explanation
Fig. 1 is shape assumption diagram of the present utility model.
Fig. 2 is structure sectional view of the present utility model.
Fig. 3 is the A-A sectional view of Fig. 2.
Fig. 4 is the structural representation of the utility model wedge dish.
Fig. 5 is the B-B sectional view of Fig. 4.
Fig. 6 is the C-C sectional view of Fig. 4.
Fig. 7 is the structural representation of the utility model push rod shaft.
Fig. 8 is decomposing type axonometric projection graph of the present utility model.
In figure: 1, brake-caliper support, 2, outer brake slipper, 3, braking clamp body, 301, connecting body, 302, cavity, 303, positioning groove, 4, folding protecting cover, 5, guide finger, 6, clamping bolt, 7, housing, 701, positioning boss, 8, motor cover for seat, 9, connecting bolt, 10, worm screw, 11, worm gear, 1101, worm-wheel shaft, 1102, worm gear dish, 12, bearing, 13, supporting sleeve, 14, O RunddichtringO, 15, wedge dish, 1501, scalloped recess, 16, positioning screwn, 17, ball, 18, push rod shaft, 1801, pit, 19, interior jump ring, 20, copper backing, 21, pressure spring, 22, spring retainer cover, 2201, rectangle gap, 23, piston packing, 24, dust-proof cover, 25, brake disc, 26, limiting stopper, 27, inside brake block, 28, piston, 29, self-regulated nut, 30, thrust ball bearing, 31, flower shape sheet, 32, self-regulated nut back-up ring, 33, waveform elastic sheet, 34, self-regulated screw rod, 35, drive motor, 36, supporting disk, 37, bearing cap, 38, bearing, 39, position limit pin, 40, damping ring, 41, piston assembly, 42, push-rod assembly.
Embodiment
As shown in Figure 1, Figure 2 with shown in Fig. 8, Worm gear ball wedge disc type electric parking brake described in the utility model, comprise actuation gear and brake caliper assy, described brake caliper assy comprises brake-caliper support 1, braking clamp body 3, inside brake block 27, outer brake slipper 2, push-rod assembly 42 and piston assembly 41.
Described braking clamp body 3 is the integral structures be made up of a connecting body 301 and a cavity 302, connecting body 301 both sides of braking clamp body 3 upper end are symmetrically fixed with two guide fingers 5 by clamping bolt 6, and to be inserted respectively in jack corresponding to two, brake-caliper support 1 upper end by guide finger 5 and for being slidably matched, braking clamp body 3 can be slid axially along guide finger 5 on brake-caliper support 1; Guide finger 5 root respectively fixed cover be provided with folding protecting cover 4, folding protecting cover 4 is clamped between the major part nut of guide finger 5 and the jack end face of brake-caliper support 1.Described inside and outside two brake slipper to be stuck on brake-caliper support 1 respectively by stopper spring and to be positioned at brake disc 25 both sides, brake slipper can be moved axially but can not play up and down.On the connecting body 301 of described braking clamp body 3, corresponding outer brake slipper 2 one end is arranged with the claw of two one, and two claws contact with outer brake slipper 2 end face outside.
As shown in Fig. 2, Fig. 4-Fig. 6, described push-rod assembly 42 and piston assembly 41 are located in the cavity 302 of braking clamp body 3 successively, and described push-rod assembly 42 comprises wedge dish 15, multiple ball 17, push rod shaft 18, self-regulated screw rod 34, pressure spring 21 and the spring retainer cover 22 be located at successively in described cavity 302.Described wedge dish 15 is annular slice and is fixed on by a positioning screwn 16 bottom the endoporus of described cavity 302, its corresponding ball 17 1 side end face is along the circumferential direction evenly equipped with multiple scalloped recess 1501, and when the degree of depth of scalloped recess 1501 is braked along push rod shaft 18, relative sense of rotation shoals gradually.As preferably nonrestrictive, in the present embodiment, scalloped recess 1501 is three, and the central angle corresponding to each scalloped recess 1501 is 50 degree.
As shown in Figure 2 and Figure 7, described push rod shaft 18 be ladder shaft-like and miner diameter end by passing bottom Xie Pan 15 center and the cavity 302 of braking clamp body 3 and being connected with the driving mechanism of actuation gear, for transmitting torque.Along the circumferential direction uniform hemispherical dimples 1801 on the shaft shoulder of push rod shaft 18 corresponding wedge dish 15 side, pit 1801 is with ball 17 quantity equal with described scalloped recess 1501 one_to_one corresponding, described ball 17 lays respectively between corresponding pit 1801 and scalloped recess 1501, for generation of end thrust.Be provided with successively in the bottom outlet that described cavity 302 correspondence passes push rod shaft 18 and be enclosed within supporting sleeve 13 in push rod shaft 18 and O RunddichtringO 14, to realize support to push rod shaft 18 and sealing.
Described self-regulated screw rod 34 is ladder shaft-like, and its one end, large footpath is near described push rod shaft 18, and one end, large footpath spindle nose of self-regulated screw rod 34 is set with copper backing 20, and copper backing 20 is clamped between self-regulated screw rod 34 and push rod shaft 18; To reduce the spin friction resistance of self-regulated screw rod 34 pairs of push rod shaft 18.The miner diameter end of self-regulated screw rod 34 passes bottom overlapping 22 by spring retainer and is threaded with the self-regulated nut 29 of described piston assembly 41, realizes clearance self-regulating for transferring axial thrust.
Described spring retainer cover 22 is provided with the cup-shaped components of through hole for bottom, its endoporus and outer wall are stepped, spring retainer cover 22 is enclosed within the outside of described pressure spring 21, the bigger diameter end of self-regulated screw rod 34, copper backing 20, push rod shaft 18 and wedge dish 15 and is stuck in the endoporus bottom of described cavity 302 by interior jump ring 19, for realizing the axial limiting of push-rod assembly 42, can restraining spring stop collar 22 moving axially to piston assembly 41 direction by interior jump ring 19.In the middle part of spring retainer cover 22, be positioned at its endoporus ladder place is arranged with along its axial arranged rectangle gap 2201, one end, large footpath outer wall of self-regulated screw rod 34 is arranged with the rectangular boss snapped in respectively in rectangle gap 2201, to limit the circular-rotation of self-regulated screw rod 34, thus guarantee to realize clearance self-regulating.
Described piston assembly 41 comprises the piston 28 be slidably matched with cavity 302 inwall, described inside brake block 27 is close in piston 28 exterior edge face, dust-proof cover 24 and piston packing 23 is provided with between piston 28 and described cavity 302, dust-proof cover 24 and piston packing 23 are stuck in and are positioned at the annular groove of cavity 302 inwall near its inner port place, and dust-proof cover 24 is positioned at the outside of piston packing 23, described piston packing 23 is enclosed within piston 28 outer wall by interference fit, brakes rear reset to help piston 28, self-regulated nut 29 is fitted with in the shoulder hole of piston 28, self-regulated nut 29 outer wall is stepped cylindrical body and the annular boss diameter being positioned at middle part is greater than the cylindrical section external diameter of its both sides, thrust ball bearing 30 is set with successively outside the annular boss that self-regulated nut 29 is positioned at wherein portion, two colored shape sheets 31, waveform elastic sheet 33 and self-regulated nut back-up ring 32, described thrust ball bearing 30 outer ring is closed by adjacent colored shape sheet 31, described waveform elastic sheet 33 is clipped between two colored shape sheets 31, described self-regulated nut 29, thrust ball bearing 30, flower shape sheet 31 and waveform elastic sheet 33 are stuck in the shoulder hole of piston 28 by self-regulated nut back-up ring 32, to eliminate brake noise, avoid colliding between self-regulated nut 29 and piston 28.
The conical surface cooperatively interacted is processed with, to guarantee the axial motion of self-regulated nut 29 to pass to piston 28 between the annular boss and piston 28 endoporus ladder card edge of self-regulated nut 29.The annular boss shaft shoulder of self-regulated nut 29 is along the circumferential direction evenly equipped with six through holes, so that brake fluid flowing during service brake.The endoporus of described self-regulated nut 29 is stepped throughhole, its small diameter one end is tapped hole and is threaded with self-regulated screw rod 34, its one end, large footpath is unthreaded hole and is installed with a limiting stopper 26 by interference fit, move axially distance with what limit self-regulated screw rod 34, prevent self-regulated screw rod 34 from pushing up hole end surface in piston 28.Described colored shape sheet 31 is an along the circumferential direction uniform annular flake processing six grooves, thus the power that can play the self-regulated nut back-up ring 32 being stuck in piston 28 inside groove is subject to passes to waveform elastic sheet 33 and self-regulated nut 29, do not hinder again the flowing of hydraulic oil during service brake.Described waveform elastic sheet 33 is an annular flake and stamps out a circle circular arc projection, can produce axial deformation.
As shown in Figure 1-Figure 3, described actuation gear comprises and is fixed on housing 7 away from brake slipper one end on described braking clamp body 3 by multiple connecting bolt 9, described housing 7 is the integrative-structures be made up of the uncovered hollow box body of one side and the Special-shaped flange that is located at the uncovered side of casing, opposing end surface between the Special-shaped flange and braking clamp body 3 of housing 7 is respectively equipped with the circular orientation boss 701 and positioning groove 303 that cooperatively interact, to guarantee the connection coaxiality of housing 7 and braking clamp body 3.In housing 7, driving mechanism is installed, drives described push rod shaft 18 to rotate for transmitting torque.
Described driving mechanism is Worm and worm-wheel gearing and comprises intermeshing worm gear 11 and worm screw 10, and its velocity ratio is between 15 to 30 according to the different spans of vehicle, and wherein worm screw 10 is arranged on bottom in described housing 7 by the bearing 38 at its two ends; Described worm gear 11 is the integral structures be made up of worm-wheel shaft 1101 and worm gear dish 1102, it is inner that its worm-wheel shaft 1101 one end is arranged on described housing 7 by bearing 12, the other end is arranged on corresponding housing 7 one end on described braking clamp body 3 by bearing 12, and described push rod shaft 18 and described worm-wheel shaft 1101 are by the coaxial grafting of spline.Because the brake clearance of brake slipper and brake disc 25 is less, worm gear 11 usually rotates and is no more than 90 degree, therefore is weight reduction, and described worm gear dish 1102 is processed as fan-shaped, and central angle corresponding to worm-gear tooth part is 90 degree.
On housing 7, the installation inlet side of corresponding worm screw 10 is connected with a bearing cap 37 and motor cover for seat 8 in turn by bolt, drive motor 35 is installed in motor cover for seat 8, drive motor 35 output shaft end housing 7 is regular hexagon, and with motor cover for seat 8 in the middle part of regular hexagon inner hole, to limit radial direction and the circular movement of drive motor 35.Described drive motor 35 is DC servo motor and is fixed by screws on a supporting disk 36, described supporting disk 36 by the ladder card of its outer rim along being fixed by screw with motor cover for seat 8 in the port being stuck in motor cover for seat 8, drive motor 35 output shaft to be inserted in worm screw 10 outer end center hole and is connected by key, for drive transmission device action.Between motor cover for seat 8 the inner and drive motor 35, be provided with damping ring 40, to protect drive motor 35, alleviate vibration.
In described housing 7 inwall side, the braking rotation extreme position of corresponding worm gear dish 1102 is fixed with a position limit pin 39 by interference fit, to guarantee when drive motor 35 parking moment reaches maximum value, limit the maximum angle of swing of worm gear 11, avoid occurring causing the phenomenon of transmission failure to occur when brake slipper excessive abrasion rear worm wheel worm screw departs from engagement.
The working principle of Worm gear ball wedge disc type electric parking brake described in the utility model is as follows:
During parking braking, drive motor 35 rotates forward, worm screw 10 is driven to rotate, turn round rear drive worm-wheel shaft 1101 by Worm and worm-wheel gearing deceleration increasing to rotate, rotation is passed to push rod shaft 18 by spline drived by worm-wheel shaft 1101, because wedge dish 15 end face has scalloped recess 1501, and relative sense of rotation shoals gradually when the degree of depth of scalloped recess 1501 is braked along push rod shaft 18, produce under the effect of ball 17 while push rod shaft 18 is rotated and move axially, copper backing 20 will be moved axially through simultaneously and pass to self-regulated screw rod 34, self-regulated screw rod 34 is moved axially, the self-regulated nut 29 be threaded with it is promoted while compression pressure spring 21, self-regulated nut 29 contacts all the time with the piston 28 endoporus conical surface, piston 28 is produced move axially, thus promotion inside brake block 27 presses to brake disc 25 side, and braking clamp body 3 can move along guide finger 5 relative brake pincers support 1, meanwhile by ball 17 and wedge dish 15 opposite force acted on braking clamp body 3, braking clamp body 3 is moved, drive the outer brake slipper 2 mobile opposite side pressing to brake disc 25 in the other direction, until two brake slipper clamping brake discs 25, produce friction torque, make wheel braking.
During release braking force, drive motor 35 reverses, push rod shaft 18 is driven to reverse by Worm and worm-wheel gearing, the initial position of scalloped recess 1501 got back to by ball 17, self-regulated screw rod 34 and push rod shaft 18 produce axial reverse movement under the effect of pressure spring 21 restoring force, and drive self-regulated nut 29 to reset, because in the process of generation braking force, the piston packing 23 be enclosed within outside piston 28 is out of shape, rubber seal needs to recover distortion and also drives piston 28 to reset, make to recover certain brake clearance between brake slipper and brake disc 25, thus release braking force, in braking force releasing course, due to pressure spring 21, waveform elastic sheet 33, flower shape sheet 31 acts on, make the piston 28 endoporus conical surface and self-regulated nut 29 outer conical surface, self-regulated screw rod 34 and copper backing 20 and push rod shaft 18 end face close contact, ensure not produce impact when again implementing parking braking.
When implementing service brake when brake clearance is greater than setting value, piston 28 moves to left under hydraulic pressure, after gap between flower shape sheet 31 and thrust ball bearing 30 disappears, hydraulic thrust suffered by piston 28 is just by self-regulated nut back-up ring 32, waveform elastic sheet 33, flower shape sheet 31 and thrust ball bearing 30 act on self-regulated nut 29 flange, because self-regulated screw rod 34 is by spring retainer cover 22, push rod shaft 18 and pressure spring 21 limit, can not rotate and can not move, so this end thrust just forces self-regulated nut 29 to rotate, and till moving to the disappearance of break excessive gaps with piston 28 relative to self-regulated screw rod 34, now waveform elastic sheet 33 is out of shape.Remove hydraulic pressure back piston seal ring 23 piston 28 is returned to position that brake clearance equals setting value, waveform elastic sheet 33 one end restores to the original state because suffered piston 28 thrust disappears, self-regulated nut 29 axial positions reached when remaining on braking are motionless, thus ensure that the gap between colored shape sheet 31 and thrust ball bearing 30 is setting value, realize clearance self-regulating.
Although embodiment of the present utility model is open as above, but it is not restricted to listed in specification and mode of execution utilization, it can be applied to various applicable field of the present utility model completely, for those skilled in the art, can easily realize other amendment, therefore do not deviating under the universal that claim and equivalency range limit, the utility model is not limited to specific details and illustrates here and the legend described.

Claims (10)

1. a Worm gear ball wedge disc type electric parking brake, comprises actuation gear and brake caliper assy, and described brake caliper assy comprises and is located at push-rod assembly in the cavity of braking clamp body and piston assembly, it is characterized in that:
Described push-rod assembly comprises the wedge dish be located at successively in described cavity, ball, push rod shaft, self-regulated screw rod, pressure spring and spring retainer cover;
Described spring retainer cover be enclosed within described pressure spring, self-regulated screw rod, push rod shaft and wedge dish outside and bottom the cavity endoporus being stuck in described braking clamp body by interior jump ring, for realizing the spacing of push-rod assembly;
Described push rod shaft is ladder shaft-like and miner diameter end is passed by described cavity and is connected with the driving mechanism of actuation gear, for transmitting torque; Described ball is multiple and is uniformly clamped between push rod shaft and wedge dish, produces end thrust for making during push rod shaft rotation brake; The miner diameter end of described self-regulated screw rod overlaps bottom by spring retainer and passes and be connected with the self-regulated nut thread of described piston assembly, realizes clearance self-regulating for transferring axial thrust;
Described actuation gear comprises:
Housing, is fixed on described braking clamp body away from brake slipper one end;
Driving mechanism, it is Worm and worm-wheel gearing and is arranged in housing, drives described push rod shaft to rotate for transmitting torque;
Drive motor, is arranged on housing side by a motor cover for seat, and is connected with worm screw one end of driving mechanism, for drive transmission device action.
2. Worm gear ball wedge disc type electric parking brake according to claim 1, it is characterized in that: described self-regulated screw rod is ladder shaft-like, its one end, large footpath is near described push rod shaft, one end, large footpath spindle nose of self-regulated screw rod is set with copper backing, copper backing is clamped between self-regulated screw rod and push rod shaft, to reduce the spin friction resistance of self-regulated screw rod to push rod shaft.
3. Worm gear ball wedge disc type electric parking brake according to claim 1, it is characterized in that: described wedge dish is annular slice and is fixed on bottom the endoporus of described cavity, its corresponding ball one side end face is along the circumferential direction evenly equipped with multiple scalloped recess, and when the degree of depth of scalloped recess is braked along push rod shaft, relative sense of rotation shoals gradually; On the shaft shoulder of the corresponding wedge dish side of push rod shaft along the circumferential direction uniform hemispherical dimples, pit is equal with ball quantity with described scalloped recess one_to_one corresponding, and described ball lays respectively between corresponding pit and scalloped recess, for generation of end thrust.
4. the Worm gear ball wedge disc type electric parking brake according to Claims 2 or 3, it is characterized in that: described spring retainer cover is provided with the cup-shaped of through hole for bottom, its endoporus and outer wall are stepped, be arranged with along its axial arranged rectangle gap at spring retainer cover middle part, one end, large footpath outer wall of self-regulated screw rod is arranged with the rectangular boss snapped in respectively in rectangle gap, to limit the circular-rotation of self-regulated screw rod, thus guarantee to realize clearance self-regulating.
5. Worm gear ball wedge disc type electric parking brake according to claim 1, it is characterized in that: described driving mechanism comprises intermeshing worm gear and worm screw, described worm gear is made up of worm-wheel shaft and worm gear dish, it is inner that its worm-wheel shaft one end is arranged on described housing by bearing, and the other end is arranged on corresponding housing one end on braking clamp body by bearing; Described worm gear dish is fan-shaped, and central angle corresponding to its worm-gear tooth part is 90 degree.
6. Worm gear ball wedge disc type electric parking brake according to claim 5, is characterized in that: described push rod shaft and described worm-wheel shaft are by the coaxial grafting of spline.
7. Worm gear ball wedge disc type electric parking brake according to claim 1 or 5, it is characterized in that: described drive motor is DC servo motor and is fixed in motor cover for seat by a supporting disk, drive motor output shaft is inserted worm screw one end of driving mechanism and is connected by key.
8. Worm gear ball wedge disc type electric parking brake according to claim 1, it is characterized in that: it is affixed that described housing and braking clamp body pass through multiple connecting bolt, opposing end surface between housing and braking clamp body is respectively equipped with the circular orientation boss and positioning groove that cooperatively interact, to guarantee the connection coaxiality of housing and braking clamp body.
9. Worm gear ball wedge disc type electric parking brake according to claim 1 or 5, it is characterized in that: rotate extreme position in the braking of described inner walls side corresponding driving mechanism worm gear dish and be provided with a position limit pin, to guarantee when drive motor parking moment reaches maximum value, limit the maximum angle of swing of worm gear, avoid occurring causing the phenomenon of transmission failure to occur when brake slipper excessive abrasion rear worm wheel worm screw departs from engagement.
10. the Worm gear ball wedge disc type electric parking brake according to claim 1-3 any one claim, it is characterized in that: described piston assembly comprises the piston be slidably matched with cavity, the brake slipper being positioned at inner side is close in piston exterior edge face, dust-proof cover and piston packing is provided with between piston and described cavity, self-regulated nut is fitted with in the shoulder hole of piston, self-regulated nut is set with thrust ball bearing successively, the colored shape sheet that two structures are identical, waveform elastic sheet and self-regulated nut back-up ring, described self-regulated nut, thrust ball bearing, flower shape sheet and waveform elastic sheet are stuck in piston by self-regulated nut back-up ring, to eliminate brake noise, avoid colliding between self-regulated nut and piston.
CN201420476969.1U 2014-08-20 2014-08-20 Worm gear ball wedge disc type electric parking brake Expired - Fee Related CN204041784U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104196922A (en) * 2014-08-20 2014-12-10 吉林大学 Worm gear, worm, ball and wedge-disc type electronic parking brake
CN106239969A (en) * 2016-08-29 2016-12-21 荣成市华东锻压机床有限公司 Pressure machine closed height adjustment locking device
CN106812838A (en) * 2017-01-11 2017-06-09 上汽通用汽车有限公司 Parking type caliper
CN109424670A (en) * 2017-08-29 2019-03-05 比亚迪股份有限公司 Disk brake and vehicle

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104196922A (en) * 2014-08-20 2014-12-10 吉林大学 Worm gear, worm, ball and wedge-disc type electronic parking brake
CN106239969A (en) * 2016-08-29 2016-12-21 荣成市华东锻压机床有限公司 Pressure machine closed height adjustment locking device
CN106812838A (en) * 2017-01-11 2017-06-09 上汽通用汽车有限公司 Parking type caliper
CN109424670A (en) * 2017-08-29 2019-03-05 比亚迪股份有限公司 Disk brake and vehicle

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