Background technique
At present, existing brake caliper assy, is made up of brake calipers cylinder body, piston, piston packing and brake pad assembly etc., serves as the function of service brake; When being applied to trailing wheel, owing to lacking halting mechanism, thus must with the mechanism additionally arranged with the use of, the function of parking could be realized.
Want the function realizing parking in brake calipers, the inside of brake calipers needs to comprise a halting mechanism, and this halting mechanism is actuated by hand braking cable.
To the brake calipers of above-mentioned employing band halting mechanism, a known case, a kind of cylinder body of disc-type brake with halting mechanism disclosed in Chinese patent CN:01805802.7, in this mechanism, hand braking cable pulls cursor to rotate, band driven input shaft rotates, input shaft has ball ramp, the movable disk be mated also has the ball ramp of same structure, they are arranged in opposite directions, and limit embedding Metal Ball between the ball ramp in the middle of their, input shaft drives Metal Ball to rotate in ball ramp, first in the bottom in ramp, then the top of deflected areas is elevated to, Metal Ball is in rotation process, movable disk is pushed away initial position, a lock screw part is embedded on brake calipers cylinder body and keeps motionless, another part stretches in movable disk, movable disk is when pusheding away from initial position, lock screw limits its rotation, but sustainable axial translation freely in cylinder body, thus promotion brake pad assembly moves, and eliminate brake clearance generation chucking power.
This halting mechanism is functionally, or satisfactory.But, there is a problem in technique scheme, lock screw is owing to penetrating in cylinder body from cylinder body outside the rotation carrying out restraint dish, due to when parking, movable disk is in cylinder interior translation and have rotation trend, can impact, lock screw finally likely can be caused to loosen and produce leakage to lock screw, affect traffic safety, this problem is very troubling.
Summary of the invention
The object of this invention is to provide a kind of brake calipers with parking and braking mechanism, loosen with the lock screw solved existing for prior art and produce leakage, affecting the problem of traffic safety.
A compact structure, and there is the brake caliper assy of parking braking function, this brake caliper assy not only has running braking function, and can realize parking braking.
The present invention is realized by following technological means: a kind of brake calipers with parking and braking mechanism, comprises brake calipers cylinder body, piston and the parking and braking mechanism be arranged in brake calipers cylinder body, the parking braking torque arm be connected with parking and braking mechanism; Parking and braking mechanism comprises parking axle, anti-rotation lining, parking swivel nut and parking screw rod; Described parking axle is pressed against by anti-rotation lining on the inwall of brake calipers cylinder body, and it is external and be connected with parking braking torque arm that the top of this parking axle extends to described Braking clip cylinder; Described parking swivel nut is arranged on the below of described parking axle, its top relative with the bottom of this parking axle is provided with the second type inclined-plane, slope raceway that put steel ball, that cave inward, the bottom end of parking axle and this type inclined-plane, the second slope raceway are just provided with the first type inclined-plane, slope raceway that put steel ball, that cave inward to place, and this steel ball is placed between this first slope type inclined-plane raceway and the second type inclined-plane, slope raceway; The top of parking swivel nut is arranged in described anti-rotation lining, remaining part along brake calipers cylinder body axially to downward-extension and periphery arranges spiral compression spring, this spiral compression spring arranges on spring seat, and this spring seat is assemblied on anti-rotation lining; Described parking screw rod is arranged on the below of parking swivel nut, and be connected with the multiple thread on this parking swivel nut inwall by the multiple thread on its outer wall, the below of this parking screw rod extends to inside the below of described piston, its special way is, the inwall of brake calipers cylinder body is circumferentially provided with arc groove, the outer wall of described anti-rotation lining is circumferentially provided with arc convex, this arc convex limit is embedded in this arc groove, make this anti-rotation lining relative brake clamp cylinder body cannot rotate, but can move down along the axis of brake calipers cylinder body.
Above-mentioned first slope type inclined-plane raceway and the second type inclined-plane, slope raceway are all circular arc.
The lower end of above-mentioned parking axle top and parking braking torque arm is riveted together.
According to the invention has the advantages that: rotation-preventing mechanism is not embed from Braking clip cylinder external body, but at the internal work of cylinder body, do not have external impacts effect, the risk of not leaking completely, safety coefficient is very high, more reliable performance.Product structure of the present invention is also compacter simultaneously.
Embodiment
Working principle of the present invention is: when carrying out service brake, step on foot brake pedal, and oil pressure enters brake calipers cylinder body from master cylinder by oil pipe, promotes piston and moves outward, makes brake pad assembly clamp brake disc, produces chucking power, thus realize service brake.When carrying out parking braking, after pulling parking brake, parking drag-line drives parking torque arm to rotate, and because parking axle and parking torque arm are riveted together, parking axle is also driven in rotation, parking axle and parking swivel nut are all arranged on anti-rotation bush inside, allow parking axle to rotate, the boss on anti-rotation excircle of bushing is fixed in the arc groove of brake calipers cylinder body, can not rotate, and parking swivel nut is limit and is embedded on anti-rotation lining, parking swivel nut also cannot rotate but can move axially; Type inclined-plane, slope raceway on parking axle and parking swivel nut flanged surface cooperatively interacts, limit embedding steel ball therebetween, when parking axle rotates, steel ball is also driven in rotation, and because anti-rotation lining prevents the rotation of parking swivel nut, parking swivel nut is along cylinder body axial translation, promote piston to move outward, make brake pad assembly clamp brake disc, produce chucking power, thus realize parking braking.
Below in conjunction with drawings and Examples, the present invention will be further described, but do not cause any restriction to the present invention.
As shown in Figure 1, a kind of brake calipers with parking and braking mechanism, comprises brake calipers cylinder body 105, anti-rotation lining 103, parking swivel nut 104, parking screw rod 106, piston 107, and the composition such as parking axle 102.Brake calipers cylinder body 105 is provided with oil inlet hole (not shown), is connected with hard tube by Brake hose with brake master cylinder, for being communicated with brake fluid, brake calipers cylinder body 105 inside includes halting mechanism and piston 107, the end face of piston 107 contacts with brake pad assembly 108, another brake pad assembly 109 contacts with the hook of brake calipers cylinder body 105, circular brake disc (not shown) is had between two brake pad assemblies, when carrying out service brake, brake fluid enters brake calipers cylinder body 105 from oil inlet hole, produce hydraulic pressure, promoting piston 107 drives brake pad assembly 108 towards direction shown in 113 and A to movement, simultaneously because brake calipers cylinder body 105 is floating, brake calipers is while movement, its hook also drives brake pad assembly 109 to move relative to opposite direction shown in 113, thus clamping brake disc, produce braking force, realize service brake.
It is inner that parking axle 102 is arranged on brake calipers cylinder body 105, its one end is stretched out outside brake calipers cylinder body 105 and parking torque arm 101 is riveted together, rotation can be driven by parking braking torque arm 101, parking braking torque arm 101 is connected with parking handle (not shown) by parking drag-line (not shown), when pulling parking handle, parking braking torque arm 101 can by parking drag-line driven rotary, because parking axle 102 and parking braking torque arm 101 are riveted together, when parking braking torque arm 101 rotates, parking axle 102 also can be driven to rotate.
The flange plate of parking axle 102 is provided with type inclined-plane, the slope raceway be made up of circular curve, parking swivel nut 104 with matching is also provided with type inclined-plane, the slope raceway of same structure, during assembling, parking swivel nut 104 is pushed by spiral compression spring 111, and lean against on parking axle 102 by steel ball 110, parking swivel nut 104 is simultaneously also coated by spring seat 112, spring seat 112 is fixed on the cylindrical of anti-rotation lining 103, spiral compression spring 111 is made to have certain decrement, produce pretightening force, make parking swivel nut 104 keep not loosening in off working state.
Parking swivel nut 104 is provided with multiple thread, coordinates with parking screw rod 106, and parking screw rod 106 is also provided with multiple thread.The pretightening force of the thread pitch that parking swivel nut 104 coordinates with parking screw rod 106 and spiral compression spring 111 has considerable influence to from conditioning function, and has been also well known due to this mechanism from conditioning function in the industry, is here not described in detail.
As shown in Figure 2, the first type inclined-plane, raceway 201, second slope, type inclined-plane, the slope raceway 202 coordinated between parking axle 102 with parking swivel nut 104 is all made up of the Curves offset, steel ball 110 limit is embedded between two raceways, can only can promote parking swivel nut 104 toward the direction shown in 113 and A to movement at the roll inside of the first type inclined-plane, raceway 201, second slope, type inclined-plane, slope raceway 202.Therefore, when parking axle 102 is by parking torque arm 101 driven rotary, parking swivel nut 104 can along direction shown in 113 and A to movement.
As shown in Figure 3, brake calipers cylinder body 105 inwall is circumferentially provided with the groove 301 of arc, anti-rotation lining 103 outer wall is circumferentially provided with protruding 302, protruding 302 limits are embedded in groove 301, relative brake pincers cylinder body 105 cannot rotate, but can along the direction shown in 113 and A to movement, spring seat 112 press against spiral compression spring 111 in advance and is assemblied on anti-rotation lining 103 simultaneously; This mechanism is also called rotation-preventing mechanism.
When carrying out parking braking, parking drag-line drives parking braking torque arm 101 to rotate, because parking axle 102 and parking braking torque arm 101 are riveted together, also be driven to rotate, parking swivel nut 104 is under the effect of spiral compression spring 111, nestle up on parking axle 102 by steel ball 110, when parking axle 102 rotates, the first slope type inclined-plane raceway 201 of steel ball 110 between parking axle 102 and parking swivel nut 104, rotate in second type inclined-plane, slope raceway 202, promote parking swivel nut 104 to move, because projection 302 limit of anti-rotation lining 103 outer wall is embedded in the arc groove 301 of brake calipers cylinder body 105 inwall, can not rotate relative to brake calipers cylinder body 105, the swivel nut 104 of parking simultaneously limit is embedded on anti-rotation lining 103 also cannot rotate, but can towards the direction shown in 113 and A to moving axially, parking swivel nut 104 and parking screw rod 106 are engaged by multiple thread, the axial displacement of parking swivel nut 104 is passed to parking screw rod 106 by screw thread, and promote piston 107 and move, thus make to produce chucking power between brake pad assembly, clamping brake disc, realize parking braking.
The above embodiments are only the preferred embodiments of the present invention, can not limit interest field of the present invention with this, and therefore, the equivalent variations done according to the present patent application the scope of the claims still belongs to the scope that the present invention is contained.