CN107435701A - The actuator and its self-locking mechanism of electric parking system - Google Patents

Abstract

A kind of self-locking mechanism, including driving wheel and the driven pulley that is connected with capstan drive, in addition to the latch piece being folded between driving wheel and driven pulley and the ratchet around the latch piece；The latch piece is rotationally articulated on driven pulley, and the inwall of the ratchet is provided with latch, and one end of the latch piece is engaged with latch to be coordinated so as to form click；The moment of torsion of driving wheel is enabled successfully to be delivered to driven pulley provided with release element between driving wheel and driven pulley；When driven pulley is rotated with first direction, the tip of latch piece is engaged with the latch of ratchet, and driven pulley is stuck, the moment of torsion for preventing driven member from being rotated in a first direction is transferred to driving wheel, latch piece and ratchet are stuck when driven pulley of the present invention is rotated with specific direction, form self-locking, prevent car slipping.

Description

The actuator and its self-locking mechanism of electric parking system

Technical field

The present invention relates to the self-locking mechanism of the actuator of electric parking system, more particularly to actuator.

Background technology

The vehicle that the parking system of automobile is mainly used in preventing from having stopped slipping, and traditional parking system is manually operated , be commonly called as " parking brake ", driver needs rule of thumb to control the dynamics for pulling parking brake, the driving ability requirement to driver compared with It is high.

With the development of technology, electric parking system (Electrical Park Brake, EPB) gradually substitutes traditional Mechanical parking brake, the actuating that existing EPB systems include the actuator of motor and motor connection and are installed on automotive wheel Device, it is driven, is stopped by leading screw (lead screw) or ball-screw (ball screw) etc. between the actuator and actuator Che Shi, driver press electric brake button and start motor, and actuator action makes leading screw or ball screw turns, drives actuator Skidding is realized in movement.However, it is low using lead screw transmission efficiency, though transmission efficiency can be improved using ball-screw, stop After car can not self-locking, automobile can slip after brake.

The content of the invention

In view of this, there is provided a kind of transmission efficiency and can after brake the actuator of the electric parking system of self-locking and its Self-locking mechanism.

A kind of self-locking mechanism, including driving wheel and the driven pulley that is connected with capstan drive, in addition to be folded in actively Latch piece between wheel and driven pulley and the ratchet around the latch piece；The latch piece is rotationally articulated in driven pulley On, the inwall of the ratchet is provided with latch, and one end of the latch piece is engaged with latch to be coordinated so as to form click；Actively The moment of torsion of driving wheel is enabled successfully to be delivered to driven pulley provided with release element between wheel and driven pulley；When driven pulley is with When one direction rotates, the tip of latch piece is engaged with the latch of ratchet, and driven pulley is stuck, prevents driven member from revolving in the first direction The moment of torsion turned is transferred to driving wheel.

A kind of actuator of electric parking system, braking, including motor, deceleration dress are braked or released for driving brake Put and self-locking mechanism, the deceleration device include gear unit and planet wheel unit, the gear unit and motor connection, The planet wheel unit is used to be connected with actuator, and the self-locking mechanism is serially connected between gear unit and planetary gear, wraps Include driving wheel and the driven pulley being connected with capstan drive, in addition to the latch piece being folded between driving wheel and driven pulley with And the ratchet around the latch piece；The latch piece is rotationally articulated on driven pulley, and the inwall of the ratchet is provided with card Tooth, one end of the latch piece is engaged with latch to be coordinated so as to form click；Unblock is provided between driving wheel and driven pulley Element enables the moment of torsion of driving wheel to be successfully delivered to driven pulley；When driven pulley is rotated with first direction, latch piece Tip is engaged with the latch of ratchet, and driven pulley is stuck, and the moment of torsion for preventing driven member from being rotated in a first direction is transferred to driving wheel.

The actuator of invention electric parking system allows moment of torsion to be subtracted by motor via reducing gear by its self-locking mechanism Actuator is transferred to after speed, and is unable to reverse drive, self-locking is realized after skidding, prevents car slipping, ensure that actuator Safety and stability.

Brief description of the drawings

Below in conjunction with the accompanying drawings, the embodiment of the present invention is described in detail.

Fig. 1 is the structural representation according to the actuator of the electric parking system of one embodiment of the invention.

Fig. 2 is the explosive view of actuator shown in Fig. 1.

Fig. 3 is the enlarged diagram of the reducing gear of actuator shown in Fig. 2.

Fig. 4 is the explosive view of reducing gear shown in Fig. 3.

Fig. 5 is the structural representation of the self-locking mechanism of actuator shown in Fig. 1.

Fig. 6 is the explosive view of self-locking mechanism shown in Fig. 5.

Fig. 7 is that self-locking mechanism shown in Fig. 5 does graph of a relation in brake, and wherein driving wheel uses foreshortened figure.

Self-locking mechanism shown in Fig. 5 does graph of a relation when Fig. 8 is restarting after braking.

Fig. 9 is the structural representation according to the self-locking mechanism of another embodiment of the present invention.

Figure 10 is the explosive view of self-locking mechanism shown in Fig. 9.

Figure 11 is another angular views of the driving wheel of self-locking mechanism shown in Figure 10.

Figure 12 is that self-locking mechanism shown in Fig. 9 does graph of a relation in brake.

Self-locking mechanism shown in Fig. 9 does graph of a relation when Figure 13 is restarting after braking.

Figure 14 is the structural representation according to the self-locking mechanism of yet another embodiment of the invention.

Figure 15 is the explosive view of self-locking mechanism shown in Figure 14.

Figure 16 is the original state schematic diagram of self-locking mechanism shown in Figure 14.

Figure 17 is to do graph of a relation when self-locking mechanism shown in Figure 14 brakes.

Self-locking mechanism shown in Figure 14 does graph of a relation when Figure 18 is restarting after braking.

Embodiment

As shown in Figure 1-2, electric parking system actuators of the present invention include shell 10, be contained in motor 20 in shell 10, The reducing gear 30 being connected with motor 20.

The shell 10 includes shell block 12 and the lid 12 on the top for being connected to shell block 14.The lid 12 and shell block 14 are collectively forming accommodation space 16, house motor 20, reducing gear 30.Wherein, the motor 20 is used to provide power source, has One output shaft 22.The reducing gear 30 includes gear unit 32 and planet wheel unit 34.Wherein, planet wheel unit 34 and electricity Machine 20 is arranged side by side；Gear unit 32 is laterally connected between the top of motor 20 and planet wheel unit 34.In the present embodiment, institute The bottom for stating planet wheel unit 34 is connected with output 70.The output 70 is extend out to outside shell 10, as whole The output element of actuator, formed and be connected with actuator.The high-speed rotation of motor 20 is via gear unit 32, planetary gear list After member 34 is slowed down step by step, driving output 70 slowly runs, and produces very big driving torsion, drives actuator movement braking brake Or release braking.

As shown in Figure 3-4, in the present embodiment, the gear unit 32 is belt transmission, including wheel for inputting 36, output wheel 38 and belt 39 of the ring set on wheel for inputting 36 and output wheel 38.Wherein, wheel for inputting 36 is socketed on the output shaft 22 of motor 20 On, with the synchronous axial system of motor 20；Belt 39 rotates with wheel for inputting 36 and drives output wheel 38 to rotate.It is preferred that the output wheel 38 size is much larger than the size of wheel for inputting 36, so as to which the rotating speed that output wheel 38 exports is less than the rotating speed of motor 20, carries out preliminary Slow down.In other embodiments, the gear unit 32 can also be gear drive, Worm Wheel System etc. or more Kind transmission is combined.

The planet wheel unit 34 includes gear hub 40 and the single-stage or series of rows star-wheel that are contained in gear hub 40 42, as being secondary planet wheel in the present embodiment.(not shown) with teeth is formed on the internal face of the gear hub 40 to nibble with planetary gear Close.It is described to include a sun gear 44, the planet carrier 48 of multiple planetary gears 46 and one per one-level planetary gear 42.The multiple planet Wheel 46 is rotatably connected on planet carrier 48 by an axle respectively；The sun gear 44 is located among the multiple planetary gear 46 And engaged with each planetary gear 46；Circle tooth corresponding with gear hub 40 is meshed each planetary gear 46 simultaneously.

The planetary gear at different levels 42 concatenates step by step, and the sun gear 44 of next stage is connected with the planet carrier 48 of upper level；First Level sun gear 44 is connected in output wheel 38；Most end primary planet carrier 48 is connected with output 70.The planet wheel unit 34 During operating, the rotation of sun gear 44 drives the rotation of planetary gear 46 being engaged with.Due to planetary gear 46 and fixed gear hub 40 It is meshed, forms revolution while 46 rotation of planetary gear centered on sun gear 44, drives the concomitant rotation of planet carrier 48 simultaneously to turn round Square is exported to next stage sun gear 44.It is in this way, single relative to transmission by the transmission of planetary gears 42 at different levels, the rotating speed of output 70 The output wheel 38 of member 32 reduces in the order of magnitude.

The actuator also includes a self-locking mechanism 50, and it is serially connected between gear unit 32 and planet wheel unit 34, uses In permission torque drive of the gear unit 32 to planet wheel unit 34, but limit moment of torsion of the planet wheel unit 34 to gear unit 32 Transmission.To ensure the coaxiality between component, the self-locking mechanism 50, planet wheel unit 34 and gear unit 32 it is defeated Going out wheel 38 can be concatenated by the phase of a fixing axle 80.

Please refer to Fig. 5 and Fig. 6, the self-locking mechanism 50 include driving wheel 52, driven pulley 54, latch piece 56 and Ratchet 58.Wherein, driving wheel 52 is connected with gear unit 32；Driven pulley 54 is connected with planet wheel unit 34；Driving wheel 52 is with passing Drive connection is formed between driving wheel 52；Latch piece 56 is connected on driven pulley 54, and it forms the cooperation of click with ratchet 58 The rotation of driven pulley 54 is limited, realizes the self-locking of actuator.After avoiding brake, moment of torsion is reversely passed from actuator to reducing gear 30 Move and cause car slipping.

As shown in figure 5, the ratchet 58 is fixed in shell block 12, generally hollow cylinder-like structure.The ratchet 58 Internal face is formed with a circle latch 580, for being engaged with latch piece 56.In the present embodiment, the gear of the planet wheel unit 34 Shell 40 is used as ratchet 58 simultaneously, and two-stage planetary gear 42 and driven pulley 54, latch piece 56 are housed in the inner, can so be reduced The amount of parts of actuator, installation procedure is reduced, and make the structure of actuator more compact.Wherein, driven pulley 54 and two-stage Planetary gear 42 is coaxially connected and positioned at the surface of two-stage planetary gear 42.The one circle latch 580 and latch piece 56 on the top of ratchet 58 Effect, tooth and the two-stage planetary gear 42 of lower end act on.In other embodiments, the ratchet 58 can be independent internal tooth rolling hitch Structure.It is preferred that the internal face convex of the ratchet 58 is located at the lower section of latch 580, held formed with step 582, the step 582 Carry driven pulley 54.It is preferred that first order sun gear 44 and the integrally connected of driven pulley 54, drive of the driven pulley 54 in driving wheel 52 During dynamic lower rotation, whole planet wheel unit 34 is driven to operate.

The driven pulley 54 is overall in flat discoid, and external diameter is slightly less than the internal diameter of ratchet 58.The driven pulley 54 Outer edge extends vertically upwards vertically stretches out outside ratchet 58 formed with shifting block 540, the top of shifting block 540.The present embodiment, The shifting block 540 is 2, is symmetrical set, and each shifting block 540 is substantially in fan annular.Pivot is also formed with the driven pulley 54 Axle 542, for being pivotally connected with latch piece 56.In the present embodiment, the pivot 542 and latch piece 56 are 2.Described two pivots 542 with two shifting blocks 540 in the circumferential in being arranged alternately.It is preferred that the axial direction that the pivot 542 protrudes relative to driven pulley 54 Highly it is less than shifting block 540, the top end face of pivot 542 is not higher than the top end face of ratchet 58.The driven pulley 54 is in each pivot The periphery of axle 542 forms fluted 544, and the groove is preferably set around the pivot 542.One back-moving spring 546 houses In the groove 544 and it is sheathed on pivot 542.Support the edge of groove 544, top in the end of the back-moving spring 546 The surface of driven pulley 54 is then protruded outwardly to by groove 544.

In the present embodiment, latch piece 56 is overall in bulk, pivot 542 of its one end formed with axis hole 560 Yu driven pulley 54 Pivot joint；The other end engages as keyed end for being formed with the latch 580 of ratchet 58.The exterior angle of the keyed end, i.e., towards spine The one jiao of outstanding locking of formation one tip 562 of wheel 58.Formed between described sophisticated 562 two surfaces 564,566 close 90 degree of angle, wherein, first surface 564 is the outer face of keyed end, is rotated approximately along latch piece 56 tangentially extending；Second Surface 566 is lateral surface of the latch piece 56 towards ratchet 58, substantially vertical with first surface 564.Shape is gone back on the latch piece 56 Into there is follower pin 568, for the mating reaction of driving wheel 52, latch piece 56 is disengaged with ratchet 58.It is described in the present embodiment Height outside the axial height of latch piece 56 stretches out driven pulley 54 with pivot 542 is suitable, and the follower pin 568 is by latch piece 56 Upper surface extend perpendicularly outward.It is preferred that the height of the axial height and shifting block 540 of the follower pin 568 and latch piece 56 It is poor suitable.

During assembling, latch piece 56 is stacked and placed on the surface of driven pulley 54, top end face, the top of pivot 542 of latch piece 56 Top end face of the end face substantially with ratchet 58 is held to be substantially flush；Follower pin 568 and the top of shifting block 540 are then stretched out outside ratchet 58 It is pivotally connected with driving wheel 52.Pivot 542 on the driven pulley 54 is inserted into the axis hole 560 of latch piece 56, can by latch piece 56 Rotationally it is articulated on driven pulley 542.The lower surface of the latch piece 56 has been recessed depression 569, houses back-moving spring 546 Top, it is described depression 569 outside wall surface and the top of back-moving spring 546 mutually support.When latch piece 56 is centered on pivot 542 During rotation, promoting the top of back-moving spring 546 makes it compress or discharge.By taking direction shown in scheming as an example, latch piece 56 is square counterclockwise To rotation compression reseting spring 546；When putting on the distress resolves on latch piece 56, the release of back-moving spring 546 promotes clamping lock Part 56 is rotationally clockwise.When no external force acts on, due to the pretightning force of back-moving spring 546, the tip 562 of latch piece 56 Engagement is maintained at the latch 580 of ratchet 58.

When the tip 562 of latch piece 56 is meshed with the latch 580 of ratchet 58, driven pulley 54 can turn along a direction It is dynamic to drive planet wheel unit 34, and then braking brake, then make latch piece 56 mutually stuck with ratchet 58 when rotating backward, formed certainly Lock.In various embodiments of the present invention and schema, illustrated in a clockwise direction exemplified by rolling brake brake.Specifically, when from Driving wheel 54 rotationally clockwise when, the latch piece 56 that is articulated on driven pulley 54 produces one and become relative to what ratchet 58 rotated therewith Gesture, however, under the limitation of static ratchet 58, the relative driven pulley 54 of the meeting of latch piece 56 rotates in an anti-clockwise direction a small angle Degree so that the tip 562 of latch piece 56 disengages with the latch 580 of ratchet 58, while compression reseting spring 546.

Compression reseting spring 546 is rotated in an anti-clockwise direction due to latch piece 56, in the tip 562 of latch piece 56 and ratchet After 58 latch 580 disengages, ratchet 58 disappears to the active force of latch piece 56, and the back-moving spring 546 of compression recovers deformation, produces Elastic-restoring force promotes latch piece 56 to reset rotationally clockwise, is formed and engaged again with next latch 580 of ratchet 58.By In the rotation of driven pulley 54 driven by motor 20, therefore the moment of torsion that its moment of torsion is formed for the elastic force of back-moving spring 546 Much greater, with the rotation of driven pulley 54, latch piece 56 can periodically be swung, its tip 562 sequentially with ratchet 58 Latch 580 is engaged and disengaged.

Conversely, when being meshed at the tip 562 of latch piece 56 with the latch 580 of ratchet 58, if driven pulley 54 is along counterclockwise When direction rotates, the first surface 564 at the tip 562 of latch piece 56 forms active force to ratchet 58, makes latch piece 56 and ratchet 58 is mutually stuck, and then reacting on driven pulley 54 makes it stop operating.

The driving wheel 52 is covered on driven pulley 54, and 54 turns of driven pulley is driven with the effect of shifting block 540 on driven pulley 54 It is dynamic.In the present embodiment, the output wheel 38 of the gear unit 32 be used as driving wheel 52 simultaneously, it include circular top plate 520 with And the annular side plate 522 extended vertically downward by the outward flange of top plate 520.The top plate 520 is covered on the top of ratchet 58, side The top of the then ring set ratchet 58 of plate 522.The belt 39 of the gear unit 32 is set on side plate 522, drives 52 turns of driving wheel It is dynamic.Chute 524 formed with corresponding shifting block 540 on the top plate 520 of the driving wheel 52, each chute 524 are curved.It is described End face 526,527 and the shifting block 540 at the circumferential both ends of chute 524 act on, and promote driven pulley 54 to rotate.It is preferred that the chute 524 arc length is more than the arc length of shifting block 540, and the top of shifting block 540 stretches in chute 524 and can rotated along chute 524 necessarily Angle.

, can band when certain end face 526,527 that driving wheel 52 turns to its chute 524 rotates touching with shifting block 540 Move the synchronous axial system therewith of driven pulley 54.In the present embodiment, when chute 524 is located at the end face 526 in counter clockwise direction downstream with dialling When block 540 touches, driving wheel 52 can drive the synchronous axial system along clockwise direction of driven pulley 54；Conversely, when chute 524 is positioned at suitable When the end face 527 in clockwise downstream touches with shifting block 540, driving wheel 52 can drive driven pulley 54 to turn in the counterclockwise direction It is dynamic.In addition, when chute 524 is located at the end face 526 in counter clockwise direction downstream and shifting block 540 touches, if driving wheel 52 is counterclockwise Direction rotates, the remains stationary of driven pulley 54, until driving wheel 52 individually turns to the end that chute 524 is located at clockwise direction downstream Face 527 is touched with shifting block 540, and driven pulley 54 could be driven to rotate in an anti-clockwise direction therewith；Similarly, when chute 524 is positioned at suitable When the end face 526 in clockwise downstream touches with shifting block 540, if driving wheel 52 is rotationally clockwise, driven pulley 54 keeps quiet Only, until driving wheel 52 individually turns to, chute 524 is located at the end face 527 in counter clockwise direction downstream and shifting block 540 is touched, ability Drive driven pulley 54 therewith rotationally clockwise.

Be also formed with neck 528 corresponding with latch piece 56 on the top plate 520 of the driving wheel 52, the chute 524 with 528 circumferentially alternating setting of neck.The outer surface of the neck 528, the i.e. internal face positioned at radial outside, it is cam surface 529, it is change in the circumferential the distance between with the pivot of driving wheel 52.It is inner that the cam surface 529 includes one With an outer end, pivot of the inner external opposite ends closer to driving wheel 52.In the counterclockwise direction, cam surface 529 is interior End is located at upstream, and outer end is located at downstream.The follower pin 568 of the latch piece 56 stretches in corresponding neck 528 and and cam Face 529 offsets.Driving wheel 52 relative to driven pulley 54 rotate when, cam surface 529 is slided with respect to follower pin 568.Follower pin 568 is set to exist The interior edge cam surface 529 of neck 528 slides, and due to driving wheel 52 and the corotation shaft axis of driven pulley 54, cam surface 529 promotes follower pin 568 rotation axis relatively close or away from driven pulley 54, turn so that latch piece 56 is formed centered on pivot 542 It is dynamic.Specifically, when driving wheel 52 rotates in an anti-clockwise direction with respect to driven pulley 54, follower pin 568 is moved to by the outer end of neck 528 The inner, latch piece 56 are rotated in an anti-clockwise direction centered on pivot 542, compression reseting spring 546；Conversely, work as the phase of driving wheel 52 During to driven pulley 54 rotationally clockwise, follower pin 568 is moved to outer end by the inner of neck 528, and latch piece 56 is with pivot Centered on 542 rotationally clockwise, back-moving spring 546 discharges.

As shown in fig. 7, when starting actuator braking brake, motor 20, which is powered, drives driving wheel 52 rotationally clockwise, Until the end face 526 in the counter clockwise direction downstream of chute 524 promotes the shifting block 540 of driven pulley 54, the up time therewith of driven pulley 54 is driven Pin direction synchronous axial system, and then drive output to rotate by planet wheel unit 34, braking brake.The side clockwise of driven pulley 54 To when rotating, follower pin 568 is located at the outer end of neck 528, second surface 566 and the ratchet 58 at the tip 562 of latch piece 56 Latch 580 is acted on, and tip 562 is constantly engaged with disengaging with latch 580, but not influences the lasting rotation of driven pulley 54.

After skidding, motor 20 powers off, and whole actuator shuts down.Now, if releasing skidding in the presence of one Trend, acting in opposition cause driven pulley 54 to form the trend rotated in an anti-clockwise direction, first table at the tip 562 of latch piece 56 Face 564 and the latch 580 of ratchet 58 act on, and make driven pulley 54 is stuck can not rotate, and actuator forms self-locking, avoids car slipping.

As shown in figure 8, when needing to release braking restarting automobile after brake, motor 20 drives driving wheel 52 counterclockwise Direction rotates.Driving wheel 52 individually rotates when initial, and the end face 526 in its counter clockwise direction downstream of chute 524 is divided with shifting block 540 From, while the follower pin 568 of latch piece 56 slides to the inner by the outer end of neck 528, rotates in an anti-clockwise direction latch piece 56, pressure Contracting back-moving spring 546.Touch driven pulley in the end face 527 that its clockwise direction downstream of chute 524 is individually turned to when driving wheel 52 During 54 shifting block 540, latch piece 56 turns to its tip 562 and the latch 580 of ratchet 58 releases stuck, and such driving wheel 52 can To drive driven pulley 54 synchronously to rotate in an anti-clockwise direction, braking is released, restarts automobile.

After releasing braking, motor 20 powers off.It is multiple because latch piece 56 rotates in an anti-clockwise direction during braking is released Position spring 546 is compressed, and now external force event resolves back-moving spring 546 recovers deformation, and it is suitable to produce resilient force latch piece 56 Clockwise, which rotates, to be resetted, and is formed and engaged again with the latch 580 of ratchet 58.In the process, with the rotation of latch piece 56, Follower pin 568 forms active force to cam surface 529, promotes the certain angle rotationally clockwise of driving wheel 52.

Fig. 9-13 show self-locking mechanism 50 according to another embodiment of the present invention, and its difference essentially consists in latch piece 56 and the shape of driving wheel 52.In the present embodiment, it be in strip that the latch piece 56 is overall, its center formed axis hole 560 and from The pivot 542 of driving wheel 54 is articulated；One end acts on formed with locking tip 562 with ratchet 58；The other end laterally outward is stretched to be formed Follower pin 568, acted on driving wheel 52.Accordingly, as shown in figure 11, the mediad of the top plate 520 of the driving wheel 52 is downward Stretch and correspond to follower pin 568 formed with projection 521, the outer peripheral face of the projection 521 and form cam surface 529.The cam surface 529 has The distal end of the near-end for having the pivot of close driving wheel 52 and the pivot for being relatively distant from driving wheel 52.It is described during assembling Top plate 520 is stacked and placed on latch piece 56, and latch piece 56 is radially positioned between the projection 521 of top plate 520 and ratchet 58.It is described The phase of cam surface 529 of the outer peripheral face of follower pin 568 and projection 521 is supported, the tip 562 of latch piece 56 and the latch of ratchet 58 580 engagements.

During skidding, as shown in figure 12, driving wheel 52 is rotated clockwise under the drive of motor 20, with shifting block 540 effects promote the concomitant rotation of driven pulley 54；After brake, if the trend for releasing skidding be present, driven pulley 54 forms the inverse time The trend that pin direction rotates, the first surface 564 at the tip 562 of latch piece 56 act on the latch 580 of ratchet 58, make driven pulley 54 is stuck, forms self-locking, above-mentioned principle is identical with process with first embodiment, seldom repeats.Need to restart vapour after brake Che Shi, as shown in figure 13, motor 20 drive driving wheel 52 to rotate in an anti-clockwise direction certain angle, the cam surface 529 of projection 521 with The follower pin 568 of latch piece 56 acts on, and latch piece 56 is rotated in an anti-clockwise direction compression reseting spring centered on pivot 542 546, while the tip 562 of latch piece 56 and the latch 580 of ratchet 58 are disengaged.In this way, when driving wheel 52 turn to from When the shifting block 540 of driving wheel 54 is touched again, drive driven pulley 54 reversely to rotate in an anti-clockwise direction therewith, release braking, open again Electrical automobile.After braking is released, the elastic acting force of back-moving spring 546 promotes latch piece 56 to reset rotationally clockwise, with The latch 580 of ratchet 58 forms engagement again, while the follower pin 568 on latch piece 56 acts on driving wheel 52 and promotes its up time Pin direction turns an angle reset.

Figure 14-18 show self-locking mechanism 50 according to yet another embodiment of the invention, self-locking mechanism 50 in the present embodiment Latch piece 56 is identical with first embodiment, and difference essentially consists in the drive mechanism and side between driving wheel 52 and driven pulley 54 Formula.In the present embodiment, set between the every end face 526,527 and the shifting block 540 of driven pulley 54 of the chute 524 of the driving wheel 52 It is equipped with a spring 61,62.It is preferred that two springs 61,62 of each both sides of shifting block 540 have different coefficient of elasticity.This implementation In example, exemplified by rotating brake in a clockwise direction, the spring positioned at the downstream of counter clockwise direction one of shifting block 540, hereinafter referred to as first Spring 61, relative to the spring of counter clockwise direction upstream, hereinafter referred to as second spring 62, there is stronger elasticity.The driving wheel 52 relative driven pulleys 54 rotationally clockwise when, compress the first spring 61；When first spring 61 recovers deformation, driving wheel is promoted 52 rotate in an anti-clockwise direction.Conversely, driving wheel 52 relative to driven pulley 54 against pin direction rotate when, compress second spring 62；Second When spring 62 recovers deformation, driving wheel 52 is promoted rotationally clockwise.

To install the spring, in the present embodiment, the edge of the driven pulley 54 protrudes to be formed outside the first outer wall and second Wall, and formed with the first block 62 and the second block 64 at a certain distance from the circumferential both sides of each shifting block 540.First block 62nd, space is formed between the first outer wall and shifting block 540, houses the first spring 61；Second block 64, the second outer wall and shifting block Space is formed between 540, houses second spring 62.The length of first, second spring 61,62 and the length in corresponding space Quite.Supported respectively with first, second block 63,64 and the phase of shifting block 540 at the both ends of first, second spring 61,62.Preferably Ground, to ensure driving wheel 52 to the active force of first, second spring 61,62, the end face 526,527 of chute 524 is relative to top plate 520 have been downwardly extending backing pin 65.Backing pin 65 is corresponded between first block 63 and the first outer wall formed with opening 66；The Also backing pin 65 is corresponded between two blocks 64 and the second outer wall and forms opening 66.The width of the opening is more than the width of backing pin 65, So that backing pin 65 is free to through the opening without producing interference with driving wheel 52.Driving wheel 52 is with respect to driven pulley 54 During rotation, wherein a backing pin 65 passes through the opening 66 of corresponding first/second block 63,64 and corresponding first/second spring 61st, 62 touching is formed, and then compresses corresponding first/second spring 61,62；Another backing pin 65 is through corresponding the simultaneously The opening 66 of two/the first blocks 62,61 separates with corresponding the second/the first spring 62,61.

In addition, in the present embodiment, the outer surface of the neck 528 on the driving wheel 52, i.e. cam surface 529 are in the circumferential Both ends be formed close to driving wheel 52 pivot near-end, the center in circumference forms the rotation for being relatively distant from driving wheel 52 The distal end at center.In an initial condition, as shown in figure 16, the shifting block 540 of driven pulley 54 is located in the chute 524 of driving wheel 52 Centre, the backing pin 65 at the both ends of chute 524 are located at the opening 66 of first, second block 63,64, and first, second spring 61,62 is in Nature.Now, the follower pin 568 of latch piece 56 is located at the center of neck 528, tip 562 and the ratchet 58 of latch piece 56 Engagement.When starting actuator brake, motor 20 drives driving wheel 52 rotationally clockwise, as shown in figure 17, when initial, actively Wheel 52 individually rotates a small angle, compresses the first spring 61, the transfixion of driven pulley 54.In the process, latch piece 56 Follower pin 568 slides to the near-end in the counter clockwise direction downstream of neck 528, while the cam surface 529 of neck 528 promotes latch piece 56 Rotated in the counterclockwise direction centered on pivot, the tip 562 of latch piece 56 disengages with the latch 580 of ratchet 58, back-moving spring 546 are compressed.

When the first spring 61 is compressed into a certain degree, driving wheel 52 is transferred to shifting block to the active force of the first spring 61 540, the synchronous rotation lasting clockwise of driven pulley 54 is driven, forms skidding.During skidding, latch piece 56 The latch 580 of tip 562 and ratchet 58 be in disengaged condition, relative to tip 562 and latch 580 in foregoing two embodiment not Engage and disengage disconnectedly, the friction of the self-locking mechanism 50 of the present embodiment less, noise it is small.After skidding, motor 20 powers off.This When, the first spring 61 compressed recovers deformation, promotes driving wheel 52 reversely to rotate in an anti-clockwise direction a small angle and resets.This During, follower pin 568 slides to the center of neck 528, that is, corresponds to the remote location of cam surface 529, and back-moving spring 546 recovers Deformation promotes latch piece 56 to reset rotationally clockwise, and tip 562 is formed again with the latch 580 of ratchet 58 engages, and returns to Original state shown in Figure 16.

When needing to restart automobile after brake, motor 20 drives driving wheel 52 to rotate in an anti-clockwise direction, as shown in figure 18, Driving wheel 52 individually rotates a small angle when initial, compresses second spring 62, the transfixion of driven pulley 54.In the process, The follower pin 568 of latch piece 56 slides to the near-end of the clockwise direction downstream side of neck 528, while the cam surface 529 of neck 528 Latch piece 56 is promoted to rotate in an anti-clockwise direction, the tip 562 of latch piece 56 disengages with the latch 580 of ratchet 58, now resets bullet Spring 546 is compressed.When second spring 62 is compressed into a certain degree, driving wheel 52 is transferred to the active force of second spring 62 Shifting block 540, the synchronous counterclockwise lasting rotation of driven pulley 54 is driven, releases skidding.After releasing braking, motor 20 is disconnected Electricity.The second spring 62 compressed recovers deformation, and promoting driving wheel 52, a small angle resets rotationally clockwise.This process In, follower pin 568 slides to the center of neck 528, and back-moving spring 546 recovers deformation and promotes latch piece 56 rotationally clockwise Reset, tip 562 is formed again with the latch 580 of ratchet 58 engages, and turns again to the original state shown in Figure 16.

As shown in the above, the actuator of electric parking system of the present invention is by its self-locking mechanism 50, makes moment of torsion can be with Actuator is transferred to after being slowed down by motor 20 via reducing gear 30, and is unable to reverse drive, self-locking is realized after skidding, Car slipping is prevented, ensure that the safety and stability of actuator.Because actuator can realize self-locking, actuator and actuating in itself The ball-screw of transmission efficiency can be used between device, lifts the efficiency of whole parking system.It is it should be noted that of the invention Above-mentioned embodiment is not limited to, according to the creative spirit of the present invention, those skilled in the art can also make other changes, These changes done according to the creative spirit of the present invention, it should all be included within scope of the present invention.

Claims (13)

1. a kind of self-locking mechanism, including driving wheel and the driven pulley that is connected with capstan drive, it is characterised in that also include folder The latch piece and the ratchet around the latch piece being placed between driving wheel and driven pulley；The latch piece is rotationally pivotally connected In on driven pulley, the inwall of the ratchet is provided with latch, and one end of the latch piece is engaged with latch so as to form click Coordinate；The moment of torsion of driving wheel is enabled successfully to be delivered to driven pulley provided with release element between driving wheel and driven pulley；When When driven pulley is rotated with first direction, the tip of latch piece is engaged with the latch of ratchet, and driven pulley is stuck, prevents driven member edge The moment of torsion of first direction rotation is transferred to driving wheel.

2. self-locking mechanism as claimed in claim 1, it is characterised in that pass through at least one pair of between the driving wheel and driven pulley The shifting block and chute of mutual cooperation realize drive connection, and the circumferential width of the chute is more than the shifting block, the week of the chute To both ends inwall there are both ends of the surface to be respectively used to support shifting block so as to drive shifting block.

3. self-locking mechanism as claimed in claim 2, it is characterised in that one is provided between the every end face and shifting block of the chute Spring.

4. self-locking mechanism as claimed in claim 3, it is characterised in that the rigidity of the spring of each shifting block both sides is different.

5. self-locking mechanism as claimed in claim 2, it is characterised in that the release element include be arranged on latch piece from Dynamic pin and the cam surface being formed on driving wheel, when driving wheel rotates with respect to driven pulley, cam surface and follower pin act on push card Latch fitting rotates relative to driven pulley.

6. self-locking mechanism as claimed in claim 5, it is characterised in that formed with neck, the cam surface on the driving wheel For the contoured surface of neck inwall, the follower pin is stretched out and is inserted into neck by latch piece, supported with cam surface.

7. self-locking mechanism as claimed in claim 6, it is characterised in that the cam surface is included proximally and distally, the near-end Be disposed adjacent successively on a direction of rotation with distal end, the near-end opposite proximal end closer to the driving wheel pivot, The pivot of the driven pulley and the pivot coaxial line of driving wheel.

8. self-locking mechanism as claimed in claim 6, it is characterised in that the cam surface includes two near-ends and a distal end, edge On one direction of rotation, the near-end, distal end, near-end are disposed adjacent successively, and the near-end opposite proximal end is closer to the driving wheel Pivot, the pivot of the driven pulley and the rotation center coaxial line of driving wheel.

9. self-locking mechanism as claimed in claim 5, it is characterised in that the center protrusion of the driving wheel is formed with projection, institute The outer peripheral face that cam surface is projection is stated, the latch piece is diametrically folded between projection and ratchet, the other end of latch piece The cam surface for forming the follower pin and fixture block is supported.

10. self-locking mechanism as claimed in claim 1, it is characterised in that formed with pivot on the driven pulley, on the pivot Back-moving spring is arranged with, the latch piece is articulated on pivot and supported with one end of back-moving spring, and latch piece is with first direction Compression reseting spring during rotation, latch piece is promoted to be rotated with second direction when back-moving spring recovers deformation.

11. a kind of actuator of electric parking system, brakes or release braking for driving brake, the actuator includes electricity Machine and the deceleration device with motor connection, it is characterised in that the self-locking mechanism also as described in claim 1 to 10 any one, The deceleration device includes gear unit and planet wheel unit, the gear unit and motor connection, the planet wheel unit For being connected with actuator, the self-locking mechanism is serially connected between gear unit and planetary gear.

12. actuator as claimed in claim 11, it is characterised in that the gear unit is belt transmission, gear unit The driving wheel of output wheel and self-locking mechanism is structure as a whole.

13. actuator as claimed in claim 11, it is characterised in that the planet wheel unit includes gear hub and is contained in At least primary planet wheel in gear hub, the ratchet of the gear hub and self-locking mechanism are structure as a whole.