CN100394059C - Combined service and parking brake apparatus - Google Patents
Combined service and parking brake apparatus Download PDFInfo
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- CN100394059C CN100394059C CNB2005100817827A CN200510081782A CN100394059C CN 100394059 C CN100394059 C CN 100394059C CN B2005100817827 A CNB2005100817827 A CN B2005100817827A CN 200510081782 A CN200510081782 A CN 200510081782A CN 100394059 C CN100394059 C CN 100394059C
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Abstract
A combined service and parking brake apparatus includes a piston which forms a hydraulic chamber within a cylinder portion; a brake lining which, when pressed by the piston, brakes rotation of a disc rotor; a second piston which divides the hydraulic changer into a first hydraulic chamber and a second hydraulic chamber; a friction clutch which allows rotation of the second piston when the second piston is held at its home position and which disables rotation of the second piston when the second piston moves by a predetermined distance toward the second hydraulic chamber; an adjuster including an internal-thread portion and an external-thread portion and adapted to adjust the clearance between the pistons in accordance with the amount of wear of the brake lining; and a changeover valve for establishing and shutting off the communication between the first hydraulic chamber and the second hydraulic chamber.
Description
Technical field
The present invention relates to a kind of combined type operation and stopping brake equipment, it can be used as vehicle brake apparatus, can not only when equipment is used as the operation break but also when equipment is used as parking brake, utilize brake fluid pressure to generate braking force, and this equipment disposition becomes when this equipment is used as parking brake, after generating braking force, this plant machinery ground locking is to keep braking force.
Background technique
Operation of the combined type of the type and stopping brake equipment are disclosed in for example Japanese PCT patent disclosure 2000-504811 number.As shown in Figure 4 combined type operation and stopping brake equipment in open comprise: place the piston of cylinder, thereby its mode forms hydraulic chamber for can not moving in cylinder interior along cylinder-bore axis around the cylinder-bore axis rotation; Brake block, when piston is supplying under the pressure of the brake fluid in the hydraulic chamber when mobile, this brake block moves under the pressure of piston and engages with the rotatable member that will be braked, and realizes brake operating on rotatable member; Adjusting nut, this adjusting nut are connected in hydraulic chamber in the cylinder, and its mode is and can move along cylinder-bore axis around the cylinder-bore axis rotation; Friction clutch, it is arranged between adjusting nut and the cylinder, thereby allow adjusting nut under unlocked condition, to rotate, and forbid that adjusting nut rotates under locked condition, wherein adjusting nut is in its initial position under unlocked condition, and adjusting nut has moved predetermined distance along cylinder axis from its initial position under locked condition; Regulator, this regulator comprise the male thread portion of the adjusting axle that is wholely set with piston and integrally set with adjusting nut and with the female thread portion of male thread portion engagement, can be by adjusting the gap between piston and the adjusting nut automatically according to the wear extent of brake block, thus the operation timing of friction clutch can be adjusted automatically; And electromagnetic actuators, this electromagnetic actuators can remain on friction clutch in the connecting state and the brake block that moved under the piston applied pressure simultaneously clamps the rotatable member that is braked.
In above-mentioned disclosed combined type operation and stopping brake equipment, stop using (outage) by electromagnetic actuators, therefore friction clutch can remain in the separate condition, allows the rotation of adjusting nut and the piston that is connected on the adjusting nut via regulator moves along cylinder-bore axis.So, at this moment, utilizing the brake fluid supply in the hydraulic chamber or to discharge from hydraulic chamber, piston can advance or retreats along cylinder-bore axis; That is, equipment can be used as the operation brake service.
By the startup (energising) of electromagnetic actuators, friction clutch can be maintained in the connecting state, prevents from the rotation of adjusting nut thus and prevent thus to be connected to piston moving along cylinder-bore axis on the adjusting nut via regulator.Therefore, combined type operation and stopping brake equipment can be used as parking brake and operates, and is as described below.Therein in the situation that brake fluid supplies in the hydraulic chamber and piston advances along cylinder-bore axis (braking state that brake block moves and engages with the rotatable member that will be braked under by the piston applied pressure), electromagnetic actuators is activated, and thus friction clutch is brought in the connecting state and therefore prevented into adjusting nut rotation and the piston that is connected on the adjusting nut via regulator from moving along cylinder-bore axis.Therefore, even when brake fluid is discharged, also can keep braking state from hydraulic chamber; That is, equipment can be used as the parking brake operation.
Therefore the combined type operation in above-mentioned the disclosing and the configuration mode of stopping brake equipment have the advantage of compact arrangement for hold friction clutch, regulator, electromagnetic actuators and other element in cylinder.Equipment has regulator, and regulator can automatically be regulated the operation timing of friction clutch thus according to the gap between automatic regulating piston of the wear extent of brake block and the adjusting nut, therefore has the advantage of consistent stopping brake performance.Yet, electromagnetic actuators is if will be contained in the hydraulic chamber, will bring the misgivings of reliability aspect, for example place the fluid resistance of the electromagnetic induction coil of brake fluid, and extend through cylinder from the electromagnetic induction coil that places hydraulic chamber and arrive the sealing integrity and the thermal resistance of the lead-in wire of device external.
And in above-mentioned disclosed combined type operation and the operation of stopping brake equipment as parking brake, when brake fluid supplied in the hydraulic chamber under pressure, electromagnetic actuators was activated, and therefore friction clutch was brought in the connecting state.In this case, the mate between the female thread portion of the male thread portion of adjusting axle and adjusting nut is under the stretching situation.In the release (brake fluid ends to supply to hydraulic chamber) of subsequently brake fluid pressure, the reaction force of brake block promotes piston backward, the be threaded into thread pitch of the distance of promotion for occurring in the mate between the female thread portion of the male thread portion of regulating axle and adjusting nut.This will make stopping brake power reduce inevitably.
Summary of the invention
An object of the present invention is to provide operation of a kind of combined type and stopping brake equipment, described equipment has highly reliably braking ability and simultaneously above-mentioned traditional combined type moves and the shortcoming of stopping brake equipment is also contained in wherein.
Another object of the present invention provides a kind of combined type operation and the stopping brake equipment that can avoid stopping brake power reduction when brake fluid pressure discharges.
For achieving the above object, the invention provides a kind of combined type operation and stopping brake equipment, comprising: be arranged at the piston in the cylinder, its mode can move along cylinder-bore axis for not centering on the cylinder-bore axis rotation, thereby forms hydraulic chamber in cylinder; Brake block, when piston is supplying under the pressure of the brake fluid in the hydraulic chamber when mobile, described brake block is moved by piston under pressure and engages with the rotatable member that will be braked, and therefore realizes brake operating on rotatable member; Be arranged at second piston in the hydraulic chamber, its mode is and can move between its initial position and Qi Fei initial position along cylinder-bore axis around the cylinder-bore axis rotation, thereby hydraulic chamber is divided into first hydraulic chamber and second hydraulic chamber, second piston is limited to initial position in the motion of piston protrusion direction, and second piston is promoted to initial position along cylinder-bore axis from non-initial position by biasing arrangement; The first stationary spiral element integrally is provided in first hydraulic chamber with piston, extends and has a predetermined helical pitch along cylinder-bore axis; The first removable helix element, have the thread surface relative with the thread surface of the first stationary spiral element, set integratedly with second piston, and mesh, and in the middle of them, the predetermined thread pitch that is threaded into occurs along cylinder-bore axis with the first stationary spiral element; Friction clutch, this friction clutch can make second piston and cylinder be engaged with each other and second piston and cylinder are broken away from each other, when second piston remains on its initial position, friction clutch is brought into separate condition and allows the rotation of second piston, thereby break away from from cylinder, and when second piston from initial position when non-initial position moves and engages with cylinder, friction clutch is brought into connecting state and forbids the rotation of second piston; And changing valve, described changing valve is arranged on and allows brake fluid to supply with thus from the hydraulic pressure branch line that second hydraulic chamber is discharged to second hydraulic chamber thus, and from allowing brake fluid to supply with and branch from the hydraulic pipe line that first hydraulic chamber is discharged thus to first hydraulic chamber thus, the connection between first hydraulic chamber and second hydraulic chamber can be set up and cut off to described changing valve.
In combined type according to the present invention operation and stopping brake equipment, when changing valve had been set up connection between first hydraulic chamber and second hydraulic chamber, brake fluid supplied under identical pressure in first hydraulic chamber and second hydraulic chamber.Therefore, can not acted on second piston by the extruding force that hydraulic difference caused, such second piston just can be maintained at its initial position.Thereby friction clutch can be maintained under the separate condition, allows the rotation of second piston thus and is connected to piston moving along cylinder-bore axis on second piston via the first removable helix element and the first stationary spiral element.Therefore, at this moment, piston can supply to the brake fluid in the hydraulic chamber of being made up of first hydraulic chamber and second hydraulic chamber and discharges and move forward and backward along cylinder-bore axis from hydraulic chamber by means of brake fluid.That is, equipment can be used as the operation brake service.
When changing valve cut off connection between first hydraulic chamber and second hydraulic chamber, brake fluid only supplied to first hydraulic chamber under pressure.In this case, second piston can utilize the hydraulic difference between first hydraulic chamber and second hydraulic chamber and move predetermined distance from its initial position to second hydraulic chamber, therefore friction clutch will engage like this, forbids the rotation of second piston and is connected to piston moving along cylinder-bore axis on second piston via the first removable helix element and the first stationary spiral element.
Therefore, changing valve cuts off under the situation that is communicated with between first hydraulic chamber and second hydraulic chamber therein, and the brake fluid under pressure supplies to and is accompanied by following operation in first hydraulic chamber.Piston advances and brake block is moved under pressure along cylinder-bore axis, and hydraulic pressure official post second piston between first hydraulic chamber and second hydraulic chamber moves predetermined distance to second hydraulic chamber.Therefore, on piston one side, brake block engages with the rotatable member that will be braked, and realizes brake operating thus on rotatable member.Therefore on second piston, one side, friction clutch is maintained under the connecting state, forbids the rotation of second piston and is connected to piston moving along cylinder-bore axis on second piston via the first removable helix element and the first stationary spiral element.Under this situation, relevant part member can the deflection according to the supply of the brake fluid under pressure, and discharge along with the pressure of brake fluid discharges, and this deflection can reduce and disappear.
Therefore, under this situation, discharge when discharging carrying out the pressure of brake fluid from first hydraulic chamber, axial force (along the compressive force of cylinder-bore axis) corresponding to residual above-mentioned deflection remains in the first removable helix element of getting involved between the piston and second piston and the first stationary spiral element, can keep above-mentioned braking maneuver by this.That is, equipment can be used as the parking brake operation.Parking brake can be by following release: set up under the situation that is communicated with between first hydraulic chamber and second hydraulic chamber at changing valve, brake fluid supplies under pressure in first and second hydraulic chambers, therefore makes friction clutch separately, therefore allows the rotation of second piston.Under this situation, discharging discharge with the pressure of brake fluid from first and second hydraulic chambers matches, the rotation of second piston makes the piston that is connected on second piston via the first removable helix element and the first stationary spiral element move along cylinder-bore axis, thereby causes reducing and disappearing of above-mentioned deflection.Therefore, parking brake just is released.
Thereby use a kind of like this configuration in cylinder, to hold friction clutch, the first removable helix element, the first stationary spiral element and other element according to combined type operation of the present invention and stopping brake equipment, therefore have the advantage of compact arrangement.And braking equipment has the first removable helix element and the first stationary spiral element, they can be according to the gap between the automatic regulating piston of the wear extent of brake block and second piston, therefore the operation timing of therefore automatically regulating friction clutch has the advantage of consistent stopping brake performance.Because in the hydraulic chamber of cylinder, do not accommodate electric installation,, therefore provide higher reliability so just need not to consider any fluid resistance relevant, sealing integrity, thermal resistance etc. with electric installation into braking equipment.
In the present invention, preferably, be used for being connected to cylinder from the releasing device of the outside rotation of cylinder second piston.When parking brake for example because the fault of changing valve or brake fluid when not discharging via the defective of the supply of hydraulic pipe line or hydraulic pressure branch line under pressure, can use releasing device to rotate second piston.This rotation of second piston can reduce and eliminate the axial force that remains in the first removable helix element and the first stationary spiral element, makes piston be back to its brake release position and makes second piston return its initial position.Therefore, parking brake just can discharge reliably.
In the present invention, preferably, storage tank is connected on the changing valve, and the connection between first hydraulic chamber and second hydraulic chamber is when cutting off, and described storage tank can be stored the brake fluid of discharging from second hydraulic chamber.Changing valve cuts off under the situation that is communicated with between first hydraulic chamber and second hydraulic chamber therein, the brake fluid that supplies to first hydraulic chamber under pressure can increase the fluid pressure differential that acts between first hydraulic chamber and second hydraulic chamber on second piston, can increase the braking force of parking brake by this.
In the present invention, preferably, the first stationary spiral element is an internal thread, and the first removable helix element is externally threaded.Perhaps, the first stationary spiral element is externally threaded, and the first removable helix element is an internal thread.
For achieving the above object, the present invention also provides a kind of combined type operation and stopping brake equipment, comprising: be arranged at the piston in the cylinder, its mode can move along cylinder-bore axis for not centering on the cylinder-bore axis rotation, thereby forms hydraulic chamber in cylinder; Brake block, when piston outwards when mobile is supplying under the pressure of the brake fluid in the hydraulic chamber, described brake block is moved by piston under pressure and engages with the rotatable member that will be braked, and therefore realizes brake operating on rotatable member; Be arranged at the displaceable element in the hydraulic chamber, its mode is and can move between its initial position and Qi Fei initial position along cylinder-bore axis around the cylinder-bore axis rotation, the motion of displaceable element on the piston projected direction is limited to initial position, and displaceable element is promoted to non-initial position along cylinder-bore axis from initial position by first biasing arrangement; The first stationary spiral element is arranged in first hydraulic chamber integratedly with piston, extends and has a predetermined helical pitch along cylinder-bore axis; The first removable helix element, have the thread surface relative with the thread surface of the first stationary spiral element, be provided with integratedly with displaceable element, and mesh, and in the middle of them, the predetermined thread pitch that is threaded into occurs along cylinder-bore axis with the first stationary spiral element; Place the second stationary spiral element of hydraulic chamber coaxially with the first stationary spiral element, be provided with integratedly, extend along cylinder-bore axis, and have the helical pitch shorter than the helical pitch of the first stationary spiral element with cylinder; The second removable helix element, have the thread surface relative with the thread surface of the second stationary spiral element, be arranged in the hydraulic chamber, its mode is for can and moving along cylinder-bore axis around the cylinder-bore axis rotation, can mesh with the second stationary spiral element, and between them, there is the predetermined thread pitch that is threaded into, and overcomes first biasing member and promote along cylinder-bore axis by having second biasing arrangement than the bigger biasing force of first biasing arrangement along cylinder-bore axis; Friction clutch, the second removable helix element and displaceable element are engaged with each other and the second removable helix element and displaceable element are broken away from each other, when the second removable helix element overcomes second biasing arrangement away from displaceable element, described friction clutch is brought in the separate condition and allows relative rotation between the second removable helix element and the displaceable element, and when the second removable helix element was promoted by second biasing arrangement and engages with displaceable element, described friction clutch was brought in the connecting state and limits relative rotation between the second removable helix element and the displaceable element; And driving arrangement, described driving arrangement can overcome second biasing arrangement along cylinder-bore axis the displaceable element and the second removable helix element are moved to its non-initial position separately from its initial position separately.
When combined type according to the present invention operation and stopping brake equipment are operated as parking brake; Promptly, under pressure, supply in the situation of hydraulic chamber (promptly wherein therefore brake block moves under by the piston applied pressure and engages with the rotatable member that will be braked on rotatable member in the situation of realization brake operating) at brake fluid, when driving arrangement be activated with along cylinder-bore axis against second biasing arrangement with displaceable element and the second removable helix element from its initial position separately when its non-initial position separately moves, the biasing force of second biasing arrangement will make friction clutch remain in the connecting state.Therefore, the friction clutch of joint can limit the relative rotation between the displaceable element and the second removable helix element, so the displaceable element and the second removable helix element will move and rotate with integrality simultaneously along cylinder-bore axis.
Simultaneously, in braking equipment, the helical pitch in the mate between the second stationary spiral element and the second removable helix element is shorter than the helical pitch of mate between the first stationary spiral element and the first removable helix element.Therefore, when displaceable element and the second removable helix element move and when rotating with the one situation via friction clutch simultaneously along cylinder-bore axis, being threaded into thread pitch and will disappearing on a side of the second removable helix element movement direction in the mate of cylinder-bore axis between the second stationary spiral element and the second removable helix element just contacts with each other with the thread surface of the second removable helix element on movement direction one side in the thread surface of the second stationary spiral element on the side opposite with movement direction like this.Subsequently, being threaded into thread pitch and will on a side opposite, disappearing in the mate of cylinder-bore axis between the first stationary spiral element and the first removable helix element with the movement direction of the first removable helix element, like this, will contact with each other with the thread surface of the first removable helix element on an opposite side towards the thread surface of seeing the first stationary spiral element on movement direction one side with movement direction.As a result, will stop the rotation integratedly of the displaceable element and the second removable helix element.
Under this situation, the displaceable element and the second removable helix element be via the friction clutch integrator that engages, the contact segment between the thread surface of the thread surface of such second stationary spiral element and the second removable helix element will and the thread surface of the thread surface of the first stationary spiral element and the first removable helix element between contact segment relative to each other to extrapolation.Therefore, in this situation, even the hydrodynamic pressure in the hydraulic chamber reduces and therefore brake block be applied to reaction force on the piston backward during extrusion piston, the situation that described two contact segments push away outwardly away from each other also can remain unchanged.Therefore, discharging with the time as the brake fluid pressure of the braking equipment joint operation of parking brake, utilization can not cause the mode of slip that parameter of structure design is set in friction clutch and above-mentioned two contact segments with the reaction force that brake block is applied on the piston, and piston just can not be extruded backward and remain under the mechanical caging situation along cylinder-bore axis.Therefore, when discharging brake fluid pressure, can avoid the reduction of the stopping brake power of braking equipment.
In the present invention, preferably, displaceable element is second piston that places hydraulic chamber, and its mode is divided into hydraulic chamber first hydraulic chamber and second hydraulic chamber thus for can and moving along cylinder-bore axis around the cylinder-bore axis rotation; And driving arrangement is a changing valve, described changing valve is provided in and allows brake fluid to supply with thus from the hydraulic pressure branch line that second hydraulic chamber is discharged to second hydraulic chamber thus, and from allowing brake fluid to supply with and branch from the hydraulic pipe line that first hydraulic chamber is drained thus to first hydraulic chamber thus, described changing valve can set up and cut out the connection between first hydraulic chamber and second hydraulic chamber.In this case, because in the hydraulic chamber of cylinder, do not accommodate electric installation,, therefore provide higher reliability so just need not to consider any fluid resistance relevant, sealing integrity, thermal resistance etc. with electric installation into braking equipment.
In this case, preferably, storage tank is connected on the changing valve, and the connection between first hydraulic chamber and second hydraulic chamber is when cutting off, and described storage tank can be stored the brake fluid of discharging from second hydraulic chamber.Can increase because act on first hydraulic chamber on second piston and the hydraulic difference between second hydraulic chamber, thus the operation response of second piston can be strengthened, and therefore strengthen the operation response of parking brake.
For achieving the above object, the present invention also provides a kind of combined type operation and stopping brake equipment, comprise: piston, this piston with around cylinder-bore axis rotatable and along cylinder-bore axis movably mode be arranged in the cylinder, in cylinder, form hydraulic chamber thus; Brake block, when piston outwards when mobile is supplying under the pressure of brake fluid of hydraulic chamber, this brake block is moved by piston under pressure, and engages with the rotatable member that will be braked, and realizes brake operating thus on rotatable member; Displaceable element, this displaceable element is arranged in the hydraulic chamber in mode rotatable around cylinder-bore axis and that can move between its initial position and non-initial position along cylinder-bore axis, displaceable element mobile on the piston projected direction is limited to initial position, and displaceable element is promoted to non-initial position along cylinder-bore axis from initial position by first biased member, and displaceable element is promoted to initial position from non-initial position along cylinder-bore axis by second biased member, and wherein the biasing force of second biased member is greater than the biasing force of first biased member; The first stationary spiral element, this first stationary spiral element and piston are arranged in the hydraulic chamber integratedly, extend along cylinder-bore axis, and have predetermined helical pitch; The first removable helix element, this first removable helix element has the thread surface relative with the thread surface of the first stationary spiral element, be provided with integratedly with displaceable element, and be meshed with the first stationary spiral element, between the two, have predetermined screw thread double thread gap along cylinder-bore axis simultaneously; The second stationary spiral element, this second stationary spiral element and the first stationary spiral element are arranged in the hydraulic chamber coaxially, are provided with integratedly with cylinder, extend along cylinder-bore axis, and have the helical pitch shorter than the helical pitch of the first stationary spiral element; The second removable helix element, this second removable helix element has the thread surface relative with the thread surface of the second stationary spiral element, with rotatable around cylinder-bore axis and along cylinder-bore axis movably mode be arranged in the hydraulic chamber, be meshed with the second stationary spiral element, between the two, there is predetermined screw thread double thread gap along cylinder-bore axis simultaneously, the second removable helix element mobile on the piston projected direction is limited to its initial position, and the second removable helix element is promoted to initial position by the 3rd biased member; Friction clutch, this friction clutch can with the second removable helix element and displaceable element be engaged with each other and the second removable helix element and displaceable element are broken away from each other, and friction clutch becomes disengaged position and remains at displaceable element and the second removable helix element and allows to relatively rotate between the second removable helix element and the displaceable element when their initial positions separately break away from thus each other; And friction clutch becomes jointing state, and move intended distance or farther and when engaging from its initial position to its non-initial position with the second removable helix element at displaceable element, limit relatively rotating between the second removable helix element and the displaceable element; And drive unit, this drive unit can overcome second biased member displaceable element is moved to its non-initial position along cylinder-bore axis from its initial position when friction clutch is in disengaged position, and can overcome the second and the 3rd biased member when friction clutch is in jointing state displaceable element and the second removable helix element are moved to separately non-initial position along cylinder-bore axis.
When combined type according to the present invention operation and stopping brake equipment are operated as parking brake; Promptly, at brake fluid (to be brake block move under by the piston applied pressure and engages with the rotatable member that will be braked therefore on rotatable member in the situation of realization brake operating) under the situation that supplies to hydraulic chamber under the pressure, when driving arrangement be activated with overcome along cylinder-bore axis second biasing arrangement with displaceable element from its initial position when its non-initial position moves, displaceable element moves intended distance or more and engage with the second removable helix element from initial position to non-initial position, thereby friction clutch is brought in the connecting state.Therefore, when displaceable element moves intended distance or more for a long time from initial position to non-initial position, the friction clutch that engages will limit the relative rotation between the displaceable element and the second removable helix element, and displaceable element and the second removable helix element will move and rotate with the one situation simultaneously along cylinder-bore axis.
Simultaneously, in braking equipment, the helical pitch in the mate between the second stationary spiral element and the second removable helix element is shorter than the helical pitch of mate between the first stationary spiral element and the first removable helix element.Therefore, when displaceable element and the second removable helix element move and when rotating with the one situation via friction clutch simultaneously along cylinder-bore axis, being threaded into thread pitch and will disappearing on a side of the second removable helix element movement direction in the mate of cylinder-bore axis between the second stationary spiral element and the second removable helix element just contacts with each other with the thread surface of the second removable helix element on movement direction one side in the thread surface of the second stationary spiral element on the side opposite with movement direction like this.Subsequently, being threaded into thread pitch and will on a side opposite, disappearing in the mate of cylinder-bore axis between the first stationary spiral element and the first removable helix element with the movement direction of the first removable helix element, like this, will contact with each other with the thread surface of the first removable helix element on an opposite side in the thread surface of the first stationary spiral element on movement direction one side with movement direction.As a result, will stop the integral type rotation of the displaceable element and the second removable helix element.
Under this situation, the displaceable element and the second removable helix element be via the friction clutch integrator that engages, the contact segment between the thread surface of the thread surface of such second stationary spiral element and the second removable helix element will and the thread surface of the thread surface of the first stationary spiral element and the first removable helix element between contact segment push away outwardly away from each other.Therefore, in this situation, even the hydrodynamic pressure in the hydraulic chamber reduces and therefore brake block be applied to reaction force on the piston backward during extrusion piston, the situation that wherein said two contact segments are stretched out against each other also can remain unchanged.Therefore, discharging with the time as the brake fluid pressure of the braking equipment joint operation of parking brake, can not cause the mode of slip that parameter of structure design is set in friction clutch and above-mentioned two contact segments by the reaction force that is applied to brake block on the piston, piston just can not be extruded backward and remain under the mechanical caging situation along cylinder-bore axis.Therefore, when discharging brake fluid pressure, can avoid the reduction of the stopping brake power of braking equipment.
In the present invention, preferably, displaceable element is second piston that is arranged in the hydraulic chamber, and therefore its mode is divided into first hydraulic chamber and second hydraulic chamber with hydraulic chamber for can and moving along cylinder-bore axis around the cylinder-bore axis rotation; And driving arrangement is a changing valve, described changing valve is provided in and allows brake fluid to supply with thus from the hydraulic pressure branch line that second hydraulic chamber is discharged to second hydraulic chamber thus, and from allowing brake fluid to supply with and branch from the hydraulic pipe line that first hydraulic chamber is discharged thus to first hydraulic chamber thus, the connection between first hydraulic chamber and second hydraulic chamber can be set up and cut off to described changing valve.In this case, because in the hydraulic chamber of cylinder, do not accommodate electric installation,, therefore provide higher reliability so just need not to consider any fluid resistance relevant, sealing integrity, thermal resistance etc. with electric installation into braking equipment.
In this case, preferably, storage tank is connected on the changing valve, and the connection between first hydraulic chamber and second hydraulic chamber is when being cut off, and described storage tank can be stored the brake fluid of discharging from second hydraulic chamber.Can increase because act on first hydraulic chamber on second piston and the hydraulic difference between second hydraulic chamber, thus the operation response of second piston can be strengthened, and therefore strengthen the operation response of parking brake.
Description of drawings
By referring to following embodiment and consider accompanying drawing, multiple other purpose of the present invention, feature and many attendant advantages will be easier to understand and can be better understood, wherein:
Fig. 1 is the schematic block diagram that comprises according to first embodiment's of combined type of the present invention operation and stopping brake equipment braking system;
Fig. 2 is the sectional view that amplifies, and has shown the combined type operation of Fig. 1 and the necessary part of stopping brake equipment;
Fig. 3 is the explanatory that is used to explain when braking equipment action of the combined type operation shown in Fig. 1 and 2 and stopping brake equipment during as the operation brake service;
Fig. 4 is the explanatory that is used to explain the action of operation of when braking equipment is operated as the parking brake combined type shown in Fig. 1 and 2 and stopping brake equipment;
Fig. 5 is the explanatory that is used to explain the action of the combined type operation shown in Fig. 1 and 2 and stopping brake equipment when braking equipment is removed as parking brake;
Fig. 6 is the schematic block diagram that comprises according to another braking system of combined type operation of the present invention and stopping brake equipment;
Fig. 7 is the sectional view that amplifies, and has shown the necessary part according to second embodiment of combined type operation of the present invention and stopping brake equipment;
Fig. 8 is the schematic block diagram that comprises according to the 3rd embodiment's of combined type of the present invention operation and stopping brake equipment (be in and brake under the release situation) braking system;
Fig. 9 is the explanatory that is used to explain when braking equipment action of combined type operation shown in Figure 8 and stopping brake equipment during as the operation brake service;
Figure 10 is used to explain that combined type shown in Figure 8 when brake block weares and teares moves and the explanatory of the action of stopping brake equipment;
Figure 11 is the explanation view that is used for explaining the length of action between the male thread portion of the female thread portion of the piston that is adjusted in combined type shown in Figure 8 operation and stopping brake equipment and second piston;
Figure 12 is the explanatory that is used to explain after the length of action between the male thread portion of the female thread portion of regulating piston and second piston action of combined type operation shown in Figure 8 when braking equipment enters braking release situation and stopping brake equipment;
Figure 13 be used to explain when braking equipment is operated as parking brake as shown in Figure 8 the combined type operation and first explanatory of the action of stopping brake equipment;
Figure 14 be used to explain when braking equipment is operated as parking brake as shown in Figure 8 the combined type operation and second explanatory of the action of stopping brake equipment;
Figure 15 be used to explain when braking equipment is operated as parking brake as shown in Figure 8 the combined type operation and the 3rd explanatory of the action of stopping brake equipment;
Figure 16 is used to explain that combined type shown in Figure 8 when the braking equipment releasing is used as parking brake moves and first explanatory of the action of stopping brake equipment;
Figure 17 is used to explain that combined type shown in Figure 8 when the braking equipment releasing is used as parking brake moves and second explanatory of the action of stopping brake equipment;
Figure 18 is used to explain that combined type shown in Figure 8 when the braking equipment releasing is used as parking brake moves and the 3rd explanatory of the action of stopping brake equipment;
Figure 19 is the schematic block diagram that comprises according to the 4th embodiment's of combined type of the present invention operation and stopping brake equipment (be in and brake under the release situation) braking system;
Figure 20 is the explanatory that is used to explain when braking equipment action of combined type operation shown in Figure 19 and stopping brake equipment during as the operation brake service;
Figure 21 is used to explain that combined type shown in Figure 19 when brake block weares and teares moves and the explanatory of the action of stopping brake equipment;
Figure 22 is the explanation view that is used for explaining the length of action between the male thread portion of the female thread portion of the piston that is adjusted in combined type shown in Figure 19 operation and stopping brake equipment and second piston;
Figure 23 is the explanatory of the action of combined type operation shown in Figure 19 when braking equipment enters braking release situation after the length of action that is used to explain between the male thread portion of the female thread portion of regulating piston and second piston and stopping brake equipment;
Figure 24 be used to explain when braking equipment is operated as parking brake as shown in figure 19 the combined type operation and first explanatory of the action of stopping brake equipment;
Figure 25 be used to explain when braking equipment is operated as parking brake as shown in figure 19 the combined type operation and second explanatory of the action of stopping brake equipment;
Figure 26 be used to explain when braking equipment is operated as parking brake as shown in figure 19 the combined type operation and the 3rd explanatory of the action of stopping brake equipment;
Figure 27 is used to explain that combined type shown in Figure 19 when the braking equipment releasing is used as parking brake moves and first explanatory of the action of stopping brake equipment;
Figure 28 is used to explain that combined type shown in Figure 19 when the braking equipment releasing is used as parking brake moves and second explanatory of the action of stopping brake equipment; With
Figure 29 is used to explain that combined type shown in Figure 19 when the braking equipment releasing is used as parking brake moves and the 3rd explanatory of the action of stopping brake equipment.
Embodiment
Describe embodiments of the invention below with reference to accompanying drawings in detail.Fig. 1 and 2 has shown the first embodiment of the present invention.Braking system as shown in Figure 1 comprises master cylinder MC and brake fluid pressure control unit CU, and master cylinder can be boosted according to the operation of brake pedal BP by vacuum type pressurized machine VB, and the brake fluid pressure control unit can be carried out brake control and traction control.According to first embodiment, braking system is to each left rear wheel and off hind wheel RL and RR use combined type operation and stopping brake device A 1, to each the near front wheel and off-front wheel FL and the common disc brake apparatus B of FR use.
Combined type operation and stopping brake device A 1 are to have used portable caliper disc brake of the present invention.As shown in Figure 2, inner liner 13 and outer liner 14 are installed to fixing frame 15, fixing frame 15 is supporting members, and the mode of installing is for can be along the axis slip of discal rotor 11 (it and unshowned wheel rotate integratedly and serve as the rotatable member that will be braked).Inner liner 13 and outer liner 14 are suitable for clamping discal rotor from opposite side, thereby realize brake operating on discal rotor 11.As everyone knows, fixing frame 15 presents a kind of like this shape of crossing over discal rotor 11.Be positioned at discal rotor 11 inboards fixing frame 15 shown in the inside portion supporting inner liner 13, the mode of support is that inner liner 13 can be slided along rotor shaft, and is attached on the car body.Outer liner 14 is being supported in the unshowned lateral part that is positioned at the fixing frame 15 in discal rotor 11 outsides, and the mode of support is that outer liner 14 can slide along rotor shaft.
In first embodiment, second piston 25, friction clutch 27 and regulator 29 are installed among the cylinder portion 17b of removable card caliper brake 17, and releasing device 31 is connected on the cylinder portion 17b.Changing valve 33 is installed in from the hydraulic pressure branch line 23b of hydraulic pipe line 23a branch.Storage tank 35 is connected on the changing valve 33.
In hydraulic chamber Ro, second piston 25 is connected to the small diameter portion of the step hole 17b2 that is formed among the cylinder portion 17b via seal ring 37, so that can and can move around the cylinder-bore axis rotation, therefore hydraulic chamber Ro is divided into the first hydraulic chamber R1 and the second hydraulic chamber R2 along cylinder-bore axis.The first hydraulic chamber R1 accommodates friction clutch 27 and regulator 29; It is connected on the hydraulic pipe line 23a; And allow brake fluid toward wherein supplying with and discharging thus by hydraulic pipe line 23a.The second hydraulic chamber R2 accommodates releasing device 31; It is connected on the hydraulic pressure branch line 23b; And allow brake fluid toward wherein supplying with and discharging thus by hydraulic pipe line branch line 23b.
Such work that friction clutch 27 is as described below.When the cooperative action of second piston 25 by leaf spring 27e and carriage 27f remained on its initial position, friction surface 27a was positioned at the position away from friction surface 27b.Second piston 25 breaks away from cylinder portion 17b, therefore allows 25 rotations of second piston.When second piston 25 overcome leaf spring 27e from initial position when the second hydraulic chamber R2 moves intended distance, friction surface 27a just engages with friction surface 27b.Second piston 25 engages with cylinder portion 17b regularly by friction, therefore forbids the rotation of second piston 25.
Releasing device 31 can rotate second piston 25 by the peripheral operation from the cylinder portion 17b of removable card caliper brake 17.Releasing device 31 comprises to extend axially hexagonal hole 31a and the service axis 31c in the end that mode is formed at second piston 25.Service axis 31c has at it and is arranged in the Hexagon projection 31b that is provided with on the end of cylinder portion 17b, and Hexagon projection 31b can engage with hexagonal hole 31a and breaks away from hexagonal hole 31a.Service axis 31c is connected to cylinder portion 17b via seal ring 31d, and its mode is and can move along cylinder-bore axis around the cylinder-bore axis rotation; It extends through cylinder portion 17b; And also have hexagonal part 31e, the releasing rod (not shown) is connected to that this hexagonal part 31e goes up and it is provided on the end that is positioned at cylinder portion 17b outside.
Changing valve 33 is 23 logical electromagnetic change-over valves, and its outage is controlled by ECU (Electrical Control Unit) ECU.Changing valve 33 is installed among the hydraulic pressure branch line 23b, hydraulic pressure branch line 23b allows brake fluid to supply to the second hydraulic chamber R2 and discharges from the second hydraulic chamber R2, and, thereby allow brake fluid to supply with or discharge from the first hydraulic chamber R1 to the first hydraulic chamber R1 from hydraulic pipe line 23a branch.Changing valve 33 can be set up and cut off between the first hydraulic chamber R1 and the second hydraulic chamber R2 and the connection between the second hydraulic chamber R2 and the storage tank 35.
During vehicle driving, brake fluid pressure control unit CU can carry out skid control and traction control and control in known manner by ECU (Electrical Control Unit) ECU simultaneously.At the vehicle stopping period, brake fluid pressure control unit CU can the control combination formula operation of operation and stopping brake device A 1, and combined type moves and stopping brake device A 1 is controlled based on the parking brake switch SW by ECU (Electrical Control Unit) ECU with changing valve 33.Because the configuration of brake fluid pressure control unit CU is known, omitted its explanation.
Thereby being transferred to OFF in the parking brake switch SW uses the combined type operation and 1 conduct of stopping brake device A of such configuration of first embodiment to move in the situation of break, as shown in Figure 3, changing valve 33 is de-energized, connection between the such first hydraulic chamber R1 and the second hydraulic chamber R2 is established, and the safety check that is included in the changing valve 33 prevents that brake fluid from flowing to storage tank 35 from hydraulic pressure branch road 23b.Therefore, when brake fluid is when supplying with under hydraulic pipe line 23a from brake fluid pressure control unit CU under the pressure, brake fluid supplies to the first hydraulic chamber R1 and from hydraulic pipe line 23a from hydraulic pipe line 23a under pressure and enters the second hydraulic chamber R2 via hydraulic pressure branch line 23b and changing valve 33.
When changing valve 33 was set up connection between the first hydraulic chamber R1 and the second hydraulic chamber R2, brake fluid supplied under identical pressure among the first hydraulic chamber R1 and the second hydraulic chamber R2.So the extruding force that is caused by hydraulic difference can not act on second piston 25, as the result of the leaf spring 27e and the carriage 27f compounding practice of friction clutch 27, second piston 25 remains on its initial position like this.Therefore therefore, friction clutch 27 is maintained under the separate condition, allows the rotation of second piston 25 and is connected to piston 19 moving along cylinder-bore axis on second piston 25 via regulator 29.Therefore, at this moment, piston 19 can utilize the brake fluid that supplies to hydraulic chamber Ro (the first hydraulic chamber R1 and the second hydraulic chamber R2) and the brake fluid of discharging from hydraulic chamber Ro and moving forward and backward along cylinder-bore axis.In other words, braking equipment A1 can be used as the operation brake service.
At this moment, the brake fluid that supplies under pressure among the first hydraulic chamber R1 causes piston 19 to move to discal rotor 11 along cylinder-bore axis, and piston 19 makes piston packing 21 towards discal rotor 11 distortion simultaneously, therefore inner liner 13 is pressed on the discal rotor 11.Relevant reaction force will make calliper 17 move to the inside, and the reaction applicator part 17a of removable card caliper brake 17 just is pressed in outer liner 14 on the discal rotor 11 like this.Support pad 13 and 14 fixing frame 15 receive because the power that two liners 13 and 14 extruding discal rotors 11 generate, and therefore generation prevents the braking force that discal rotor 11 rotates.Under the situation of this brake actuating, removable card caliper brake 17 and other correlated parts member are supplied with and deflection under pressure owing to brake fluid.When discharging break, removable card caliper brake 17 and other correlated parts member recover from deflection and the withdrawal function are provided.
By because the release of brake pedal BP when having eliminated the release of the brake fluid pressure that supply realized from master cylinder MC to the first and second hydraulic chamber R1 and R2 at the brake fluid under the pressure, can cause piston 19 to move to the inside by piston packing 21 from the withdrawal function of above-mentioned distortion realization with by removable card caliper brake 17 and other correlated parts member recover to be realized from deflection withdrawal function, and cause removable card caliper brake 17 to move laterally, therefore liner 13 and 14 is freed from being pressed under the situation on the discal rotor 11.Therefore cancelled braking spinning movement by two liners 13 and 14 discal rotors of realizing 11.
In some cases, piston 19 advances or retreats screw thread with regulator 29 to the identical or longer distance of thread pitch along cylinder-bore axis.Piston 19 advance one section with the screw thread of regulator 29 to thread pitch equate or longer apart from the time (for example, when under excessive pressure, carrying out braking, or during brake block 13a and 14a wearing and tearing), the situation that shows turgidly among Fig. 3 (b) is set up by the situation that shows turgidly among Fig. 3 (a), like this female thread portion 29a of regulator 29 just with the male thread portion 29b of regulator 29 engagement, and towards discal rotor 11 extruding male thread portion 29b.Under the situation shown in Fig. 3 (b), second piston 25 is rotatable; Therefore, during in female thread portion 29a and male thread portion 29b engagement and towards discal rotor 11 extruding male thread portion 29b, second piston 25 will rotate and be maintained at identical substantially position (initial position) simultaneously, therefore allows piston 19 to advance and equates or longer distance to thread pitch with screw thread.
Thereby the parking brake switch SW in being in the OFF situation is transferred in the combined type operation and the situation of stopping brake device A 1 as parking brake that ON uses first embodiment, ECU (Electrical Control Unit) ECU makes changing valve 33 after the parking brake switch SW transfers ON to, through energising before the set time T1, and make brake fluid pressure control unit CU after the parking brake switch SW transfers ON to, (T1＞T2) enter force applications control situation before, brake fluid pressure control unit CU just supplies with the brake fluid that is in the prearranging quatity under the pressure to two combined type operations and stopping brake device A 1 by this through set time T2.
At this moment, after the parking brake switch SW transfers ON to, through after the set time T2, the situation that shows turgidly among Fig. 4 (b) is set up by the situation that shows turgidly among Fig. 4 (a).And, after the parking brake switch SW transfers ON to, through after the set time T1, the situation that shows turgidly among Fig. 4 (c) just by Fig. 4 (a) and (b) turgidly the situation of demonstration set up.In addition, after through set time T1, the situation that shows turgidly among Fig. 4 (d) is just set up by the situation that shows turgidly among Fig. 4 (c).Fig. 4 (a) has shown that and then the parking brake switch SW transfers ON situation afterwards to.Under this situation, changing valve 33 is energized, and the connection between the such first hydraulic chamber R1 and the second hydraulic chamber R2 will be cut off; And allow brake fluid to flow into the storage tank 35 from the second hydraulic chamber R2.
Fig. 4 (b) thus shown that wherein brake fluid supplies to the situation that realizes the stopping brake operation among the first hydraulic chamber R1 under pressure.Under this situation (situation of exerting pressure), when changing valve 33 was held energising, brake fluid only supplied to the first hydraulic chamber R1 from brake fluid pressure control unit CU under pressure, and is kept in the storage tank 35 from the brake fluid of the second hydraulic chamber R2.Under this situation, removable card caliper brake 17 and other relevant part member deflect to the screw thread that is equal to or greater than regulator 29 degree to thread pitch.This deflection meeting is owing to the pressure release discharge of brake fluid reduces.
Fig. 4 (c) has shown that the pressure that the brake fluid that supplies among the first hydraulic chamber R1 begins to stand from the first hydraulic chamber R1 discharges the situation of discharging under pressure.Under this situation (situation that pressure drop begins), when changing valve 33 is held energising, brake fluid stands to discharge towards the pressure of brake fluid pressure control unit CU via hydraulic pipe line 23a from the first hydraulic chamber R1 discharges, and the brake fluid that has flowed into storage tank 35 keeps being stored in the storage tank 35.Under this situation, the deflection meeting of removable card caliper brake 17 and other correlated parts member reduces slightly.
Fig. 4 (d) thus having shown that piston 19 and 25 mechanically locks remains on situation under the mechanical caging situation with stopping brake operation.Under this situation, changing valve 33 is de-energized, and the connection between the such first hydraulic chamber R1 and the second hydraulic chamber R2 will be set up; Just finished brake fluid and discharged discharge to the pressure of brake fluid pressure control unit CU from the first hydraulic chamber R1; And finished brake fluid from the discharge of storage tank 35 to brake fluid pressure control unit CU.Under this situation, the deflection of above-mentioned removable card caliper brake 17 and other correlated parts member will reduce screw thread with regulator 29 to the suitable degree of thread pitch, still still can keep deflection.
Simultaneously, from Fig. 4 (a) to the transition of Fig. 4 (b), because brake fluid only supplies to the first hydraulic chamber R1 from brake fluid pressure control unit CU under pressure, so piston 19 and removable card caliper brake 17 just as operating, therefore generate braking force to prevent the rotation of discal rotor 11 in the situation of braking equipment A1 as the operation brake service.At this moment, when changing valve 33 is held energising, brake fluid only supplies under pressure among the first hydraulic chamber R1, hydraulic difference between the such first hydraulic chamber R1 and the second hydraulic chamber R2 just makes second piston 25 move intended distance from its initial position as shown in Figure 4 to the second hydraulic chamber R2, thereby engages with friction clutch 27.Therefore, the rotation of second piston 25 just is under an embargo, and also is under an embargo via the axial motion that regulator 29 is connected to the piston 19 of second piston 25.
In the situation from Fig. 4 (a) in the transition of the situation shown in Fig. 4 (b), if friction clutch 27 is in the inter-engagement of piston 19 to the motion of discal rotor 11, piston 19 will be to discal rotor 11 pullings second piston 25 so, and friction clutch 27 will temporarily separate like this.Therefore, thus second piston 25 will temporarily rotate and allows piston 19 towards discal rotor 11 motion provisionally.This operation can repeat to finish towards the motion of discal rotor 11 until piston 19.
Therefore, the parking brake switch SW transfers to after the ON through set time T2 and piston 19 and finishing under the situation (situation shown in Fig. 4 (b)) to the motion of discal rotor 11 therein, even brake fluid stands to discharge discharge from the first hydraulic chamber R1 to the pressure of brake fluid pressure control unit CU subsequently, also can set up the situation of Fig. 4 (d) by the situation of Fig. 4 (c); That is, two pistons 19 and 25 are locking mechanically, therefore mechanically keeps the stopping brake operation.Under this situation, just regulator 29 is remained on corresponding to the axial force (along the compressive force of cylinder-bore axis) of the deflection of above-mentioned removable card caliper brake 17 and other correlated parts member and to insert between the piston 19 and second piston 25, above-mentioned by this braking maneuver just can remain under the mechanical caging situation.Even when changing valve 33 cuts off the power supply shown in Fig. 4 (d) like that, braking equipment A1 also can be used as the parking brake operation.
In following situation: be in that parking brake switch SW in the ON situation transfers OFF to so that first embodiment's combined type operation and stopping brake device A 1 when from be used as parking brake, discharging, after the parking brake switch transfers OFF to, through set time T3 (equaling set time T2 substantially) afterwards, and changing valve 33 keeps outage simultaneously, and ECU (Electrical Control Unit) ECU will indicate brake fluid pressure control unit CU under pressure the brake fluid of predetermined quantity to be supplied with two combined types and move and stopping brake device A 1.At this moment, the situation shown in Fig. 4 (d) just is converted to the situation shown in Fig. 5 (d) via the situation shown in Fig. 5 (a) to (c).
At Fig. 5 (a) with under the situation (b), when changing valve 33 kept outage, brake fluid pressure control unit CU will supply to brake fluid among the first and second hydraulic chamber R1 and the R2 under pressure.At Fig. 5 (c) with under the situation (d), when throw over switch 33 kept outage, brake fluid can stand to discharge discharge from the first and second hydraulic chamber R1 and R2 to the pressure of brake fluid pressure control unit CU.The transition from the situation shown in Fig. 5 (a) to the situation shown in Fig. 5 (b), brake fluid supplies under pressure among the second hydraulic chamber R2, and the friction clutch 27 that is in like this under the connecting state will separate.
At Fig. 5 (b) to the situation shown in 5 (d), therefore friction clutch 27 is held separation, allows the rotation of second piston 25 and allows piston 19 to move forward and backward along cylinder-bore axis according to the brake fluid that supplies among the first hydraulic chamber R1 or discharge from the first hydraulic chamber R1.At Fig. 5 (c) with under the situation (d), because discharging, the pressure of brake fluid from the first and second hydraulic chamber R1 and R2 discharges, the rotation of second piston 25 can make the piston 19 that is connected on second piston 25 via regulator 29 move along cylinder-bore axis, thereby causes the reducing and disappear of deflection of above-mentioned removable card caliper brake 17 and other correlated parts member.Therefore, parking brake just is released.
Thereby operation of first embodiment's combined type and stopping brake device A 1 use a kind of like this configuration to hold friction clutch 27, regulator 29 and other element in the cylinder portion 17b of removable card caliper brake 17, therefore have the advantage of compact arrangement.And, braking equipment A1 has regulator 29, regulator 29 can be according to the gap between the automatic regulating piston 19 of the wear extent of brake block 13a and 14a and second piston 25, and therefore the therefore operation timing of automatically regulating friction clutch 27 has the advantage of consistent stopping brake performance.Because in the hydraulic chamber Ro of the cylinder portion 17b of removable card caliper brake 17, do not hold electric installation,, therefore provide high reliability so braking equipment A1 can exempt electric installation with respect to misgivings such as fluid resistance, sealing integrity, thermal resistances.
In operation of combined type in first embodiment and the stopping brake device A 1, (omitted explanation in Fig. 3 to 5) as shown in Figure 2, the releasing device 31 that is used for rotating from the outside of cylinder portion second piston 25 is connected to cylinder portion 17b.When parking brake for example because the fault of changing valve 33 or brake fluid when discharging via the defective of the supply of hydraulic pipe line 23a or hydraulic pressure branch line 23b, can use releasing device 31 rotations second piston 25 under pressure.This rotation of second piston 25 can reduce and eliminate the axial force that remains in the regulator 29, makes piston 19 be back to its brake release position and makes second piston 25 return its initial position.Therefore, the situation shown in Fig. 4 (d) can be converted to the situation shown in Fig. 5 (d), and parking brake just can discharge reliably like this.
In first embodiment's combined type operation and stopping brake device A 1, storage tank 35 is connected to changing valve 33, and storage tank 35 can be stored the brake fluid of discharging from the second hydraulic chamber R2 when the connection between the first hydraulic chamber R1 and the second hydraulic chamber R2 is closed.Therefore, changing valve 33 has cut out under the situation that is communicated with between the first hydraulic chamber R1 and the second hydraulic chamber R2 therein, the brake fluid that supplies to the first hydraulic chamber R1 under pressure can increase the hydraulic difference that acts between the first hydraulic chamber R1 and the second hydraulic chamber R2 on second piston 25, can increase the braking force of parking brake by this.
According to above-mentioned first embodiment, as shown in Figure 1, the present invention implements in following braking system, described braking system comprises master cylinder MC and brake fluid pressure control unit CU, master cylinder can be boosted according to the operation of brake pedal BP by vacuum type pressurized machine VB, and the brake fluid pressure control unit can be carried out brake control and traction control.Yet, as shown in Figure 6 in improved embodiment, the present invention is included in the following braking system, described braking system comprises master cylinder MC and brake fluid pressure control unit CU, master cylinder can be boosted according to the operation of brake pedal BP by hydraulic intensifier HB, and the brake fluid pressure control unit can be carried out brake control and traction control.
As shown in Figure 2, above-mentioned first embodiment be configured to that regulator 29 comprises the female thread portion 29a that is wholely set with piston 19 and be wholely set with second piston 25 and with the male thread portion 29b of female thread portion 29a engagement.Yet, in the situation of as shown in Figure 7 second embodiment's combined type operation and stopping brake device A 2, the male thread portion 29b that the present invention can be presented as that regulator 29 comprises the female thread portion 29a that is wholely set with piston 25 and be wholely set with second piston 19 and mesh with female thread portion 29a.Except two facing surfaces part 31e were formed at the outer end place of service axis 31c of releasing device 31, second embodiment's as shown in Figure 7 configuration was similar to first embodiment as shown in Figure 2 substantially.Therefore, in Fig. 7, use common reference number represent with Fig. 2 in similar structure characteristic, and omitted the explanation of its repetition.
The foregoing description comprises releasing device 31 and storage tank 35; Yet the present invention can realize and need not to use these parts.In the embodiment who does not use storage tank 35, utilize for example expansion realization and the storage tank 35 similar functions of hydraulic pressure branch line 23b, and changing valve 33 adopts the form of 22 energising magnetic on-off valves.The foregoing description is that the disk type braker (rotatable member that is braked of break is a discal rotor) of applying for of the present invention is described; Yet the present invention can carry out suitable modification and be applied on the drum brake (rotatable member that is braked of break is a brake drum).
The foregoing description has used changing valve 33, it the time has set up connection between the first hydraulic chamber R1 and the second hydraulic chamber R2 in outage, and the connection between the closed in electrified state first hydraulic chamber R1 and the second hydraulic chamber R2 and set up connection between the second hydraulic chamber R2 and the storage tank 35.Yet, realization of the present invention also can be used following changing valve, it the time sets up connection between the first hydraulic chamber R1 and the second hydraulic chamber R2 in energising, and closes the connection between the first hydraulic chamber R1 and the second hydraulic chamber R2 and set up connection between the second hydraulic chamber R2 and the storage tank 35 when outage.
In the above-described embodiments, being used to keep between the cylinder portion 17b and second piston 25 at the interface, the seal ring 37 of sealing is provided in second piston 25.Yet seal ring 37 also can be provided on the cylinder portion 17b.In the employed in the above-described embodiments releasing device 31, be used to keep the seal ring 31d and the service axis 31c that seal at the interface between cylinder portion 17b and the service axis 31c to be provided in cylinder portion 17b.Yet seal ring 31d also can be provided on the service axis 31c.
Fig. 8 has schematically shown the third embodiment of the present invention.Operation of combined type among the 3rd embodiment and stopping brake device A 3 are used for 4 each left rear wheel and the off hind wheels (one of them does not show) of taking turns brake system of car.Braking system comprises master cylinder MC and brake fluid pressure control unit CU, and master cylinder can be operated according to the operation of the brake pedal BP that will be stepped on, and the brake fluid pressure control unit can be carried out brake control and traction control.Braking system is that each the near front wheel and off-front wheel use common disc brake apparatus (not shown).
Combined type operation and stopping brake device A 3 comprise inner liner 113 and outer liner 115, they are used for clamping discal rotor 111 (it and unshowned wheel rotate integratedly and serve as the rotatable member that will be braked) from opposite side, thereby realize brake operating on discal rotor 111; Be used to removable card caliper brake 117 that liner 113 and 115 is moved to discal rotor 111 under pressure; And cup piston 119. Liner 113 and 115 and removable card caliper brake 117 all be connected on the fixing frame (not shown), fixing frame is connected on the car body, its mode is for sliding along rotor shaft.
In the 3rd embodiment, second piston 125, thread spindle 127 and nut 129 are installed among the cylinder 117a of removable card caliper brake 117; And first spring 131, thrust bearing 133, second spring 135 and thrust bearing 137 are connected on the cylinder 117a.Changing valve 141 is installed in from the hydraulic pressure branch line 123b of hydraulic pipe line 123a branch.Storage tank 143 is connected on the changing valve 141.
In hydraulic chamber Ro, second piston 125 is connected on the cylinder 117a via seal cup 126, its mode is and can move between its initial position and Qi Fei initial position along cylinder-bore axis around the cylinder-bore axis rotation, therefore hydraulic chamber Ro is divided into the first hydraulic chamber R1 and the second hydraulic chamber R2.The first hydraulic chamber R1 is connected to hydraulic pipe line 123a and goes up and allow brake fluid to supply to wherein via hydraulic pipe line 123a and discharge thus.The second hydraulic chamber R2 is connected to hydraulic pressure branch line 123b and goes up and allow brake fluid to supply to wherein via hydraulic pressure branch line 123b and discharge thus.
The female thread portion 119a of piston 119 is first stationary spiral elements, and it has predetermined helical pitch and can be exposed among the first hydraulic chamber R1 when cylinder-bore axis extends.The male thread portion 125a of second piston 125 is first removable helix elements with the female thread portion 119a of piston 119 engagement, between them, have the predetermined thread pitch that is threaded into, and have the relative thread surface of thread surface with the female thread portion 119a of piston 119 along cylinder-bore axis.
Friction clutch FC allows joint and the disengaging between second piston 125 and the nut 129.When nut 129 broke away from against second spring 135 leaves second piston 125, friction clutch FC allowed the relative rotation between second piston 125 and the nut 129.Thereby promoted with second piston, 125 joints the time by second spring 135 at nut 129, friction clutch FC limits the relative rotation between second piston 125 and the nut 129.
Changing valve 141 is 23 logical electromagnetic change-over valves, and its energising and outage are controlled by ECU (Electrical Control Unit) ECU.Changing valve 141 is installed among the hydraulic pressure branch line 123b, hydraulic pressure branch line 123b permission brake fluid is supplied with the second hydraulic chamber R2 and is discharged from the second hydraulic chamber R2, and, thereby allow brake fluid to supply with or discharge from the first hydraulic chamber R1 to the first hydraulic chamber R1 from hydraulic pipe line 123a branch.Changing valve 141 can set up and cut out between the first hydraulic chamber R1 and the second hydraulic chamber R2 and the connection between the second hydraulic chamber R2 and the storage tank 143.When changing valve 141 outages, changing valve 141 is set up the connection between the first hydraulic chamber R1 and the second hydraulic chamber R2, and the safety check 141a that is included in the changing valve 141 prevents brake oil flow storage tank 143.When changing valve 141 energising, the connection between the first hydraulic chamber R1 and the second hydraulic chamber R2 cut out by changing valve 141 and thereby the connection of setting up between the second hydraulic chamber R2 and the storage tank 143 allows brake fluid to flow to storage tank 143 from the second hydraulic chamber R2.
During vehicle driving, brake fluid pressure control unit CU can carry out brake control and traction control and control in known manner by ECU (Electrical Control Unit) ECU simultaneously.At the vehicle stopping period, brake fluid pressure control unit CU can the control combination formula operation of operation and stopping brake device A 3, and combined type moves and stopping brake device A 3 is controlled based on the parking brake switch SW by ECU (Electrical Control Unit) ECU with changing valve 141.Because the configuration of brake fluid pressure control unit CU is known, omitted its explanation.
Thereby being transferred to OFF in the parking brake switch SW uses the combined type operation and 3 conducts of stopping brake device A of such configuration of the 3rd embodiment to move under the situation of breaks, changing valve 141 is de-energized, such first hydraulic chamber R1 is communicated with each other all the time with the second hydraulic chamber R2 and has identical pressure, and the safety check 141a that is included in the changing valve 141 prevents that brake fluid from flowing to storage tank 143 from hydraulic pressure branch road 123b.
Under this situation (travelling brake operational condition), the fluid pressure differential between the first hydraulic chamber R1 and the second hydraulic chamber R2 is always zero, and the extruding force that is caused by hydraulic difference just can not act on second piston 125 like this.Therefore, as shown in Figure 8, its biasing force just makes second piston 125 and nut 129 be maintained at its initial position separately greater than second spring 135 of first spring 131, and friction clutch FC keeps engagement.
Under this travelling brake operational condition, when brake pedal BP was stepped on, master cylinder MC supplied with hydraulic pipe line 123a with the brake fluid under the pressure via brake fluid pressure control unit CU; Brake fluid supplies to the first hydraulic chamber R1 from hydraulic pipe line 123a under pressure; And brake fluid supplies to the second hydraulic chamber R2 via hydraulic pressure branch line 123b and changing valve 141 from hydraulic pipe line 123a under pressure.
At this moment, therefore, as shown in the figure 9, although second piston 125 and nut 129 keep motionless, but, by the brake fluid under the pressure being supplied among the first hydraulic chamber R1 and the second hydraulic chamber R2, piston 119 can advance above the scope that is threaded into thread pitch between the male thread portion 125a of the female thread portion 119a of piston 119 and second piston 125 along cylinder-bore axis.In other words, braking equipment A3 can be used as the operation brake service.
At this moment, the brake fluid that supplies under pressure among the first hydraulic chamber R1 causes piston 119 to move to discal rotor 111 along cylinder-bore axis, and piston 119 makes piston packing 121 towards discal rotor 111 distortion simultaneously, therefore inner liner 113 is pressed on the discal rotor 111.Relevant reaction force will make calliper 117 move to the inside, and the reaction applicator part 117b of removable card caliper brake 117 just is pressed in outer liner 115 on the discal rotor 111 like this.Support pad 113 and 115 unshowned fixing frame just receive because the power that two liners 113 and 115 extruding discal rotors 111 generate, and therefore generation prevents the braking force that discal rotor 111 rotates.Under the situation of this brake actuating, removable card caliper brake 117 and the just deflection of other correlated parts member according to the supply that is in the brake fluid under the pressure.
By because the release of brake pedal BP when having eliminated the release of the brake fluid pressure that supply realized from master cylinder MC to the first and second hydraulic chamber R1 and R2 at the brake fluid under the pressure, can cause piston 119 to move to the inside by piston packing 121 from the withdrawal function of above-mentioned distortion realization with by removable card caliper brake 117 and other correlated parts member recover to be realized from deflection withdrawal function, and cause removable card caliper brake 117 to move laterally.Therefore, the braking that the brake actuating situation of piston 119 from Fig. 9 returned among Fig. 8 discharges situation, therefore will discharge the situation of liner 113 and 115 on being pressed in discal rotor 111.Therefore cancelled braking spinning movement by two liners 113 and 115 discal rotors of realizing 111.
Under the above-mentioned brake operating condition of travelling, for example, because the wearing and tearing of brake block 113a and 115a, when piston 119 advance along cylinder-bore axis be threaded between one section male thread portion 125a with the female thread portion 119a of piston 119 and second piston 125 that thread pitch equates or longer apart from the time, just set up as shown in figure 11 situation via as shown in figure 10 situation, and second piston 125 is in its initial position rotation, and this is accompanied by the rotation of nut 129.
Under the situation of its initial position rotation, the rotation of nut 129 is accompanied by following action at second piston 125: thus nut 129 rotates on the male thread portion 127a of thread spindle 127 and moves away from second piston 125 along cylinder-bore axis against second spring 135.Therefore, friction clutch FC separates.Subsequently, only second piston 125 is in its initial position rotation, and the length of action between the male thread portion 125a of the female thread portion 119a of piston 119 and second piston 125 just is conditioned automatically by this.
After the length of action between the male thread portion 125a of the female thread portion 119a of piston 119 and second piston 125 is regulated, be associated with the release of brake fluid pressure from the first and second hydraulic chamber R1 and R2, above-mentioned withdrawal function can cause piston 119 to move to the inside, and causes removable card caliper brake 117 to move laterally.Therefore, the brake actuating situation among Figure 11 just returns to the braking release situation among Figure 12.
Parking brake switch SW under being in the OFF situation transfers ON to so that the operation of the 3rd embodiment's combined type and stopping brake device A 3 are used as parking brake, will operate by execution stopping brake as described below: at first, when changing valve 141 is brought outage condition into by ECU (Electrical Control Unit) ECU, ECU (Electrical Control Unit) ECU makes brake fluid pressure control unit CU enter force applications control situation, by this brake fluid of brake fluid pressure control unit CU under the pressure that the first and second hydraulic chamber R1 and the R2 of braking equipment A3 supply with predetermined quantity.
So similar operation in the situation that brake pedal BP is operated under acquisition and the above-mentioned brake operating condition of travelling.Braking equipment A3 can be used as the parking brake operation.Subsequently, brake fluid is supplied with under the situation of the first hydraulic chamber R1 that brakes device A 3 from brake fluid pressure control unit CU under pressure therein, when the pressure of supplying with the brake fluid of braking device A 3 from brake fluid pressure control unit CU reaches predetermined value, as shown in Figure 3, ECU (Electrical Control Unit) ECU makes changing valve 141 energisings, therefore allows brake fluid to flow into storage tank 143 from the second hydraulic chamber R2.
Under this situation, between the first hydraulic chamber R1 and the second hydraulic chamber R2, produce hydraulic difference, such second piston 125 just moves to its non-initial position shown in Figure 15 along cylinder-bore axis from its initial position shown in Figure 13 against second spring 135.Because the biasing force of second spring 135 is clamped in friction clutch FC under the connecting state, so the friction clutch FC that engages will limit the relative rotation between second piston 125 and the nut 129, and second piston 125 and nut 129 can move along cylinder-bore axis in the rotation of one situation.
Simultaneously, in braking equipment A3, the helical pitch in the mate between the female thread portion 129a (the second removable helix element) of male thread portion 127a of thread spindle 127 (the second stationary spiral element) and nut 129 will be lacked than the helical pitch of the mate between the male thread portion 125a (the first removable helix element) of the female thread portion 119a (the first stationary spiral element) of piston 119 and second piston 125.Therefore, when second piston 125 and nut 129 move and when rotating with the one situation via friction clutch FC simultaneously along cylinder-bore axis, as shown in figure 14, the thread pitch that is threaded in the mate of cylinder-bore axis between the female thread portion 129a of male thread portion 127a of thread spindle 127 (the second stationary spiral element) and nut 129 (the second removable helix element) will disappear in the side towards the movement direction of female thread portion 129a, just contacts with each other with female thread portion 129a (the second removable helix element) on movement direction one side in the thread surface of the male thread portion 127a on the side opposite with movement direction (the second stationary spiral element) like this.Subsequently, as shown in figure 15, the thread pitch that is threaded in the mate of cylinder-bore axis between the male thread portion 125a of the piston 119 female thread portion 119a and second piston 125 (the first removable helix element) disappears on a side opposite with the movement direction of male thread portion 125a, and the thread surface of the male thread portion 125a (the first removable helix element) on the thread surface of the female thread portion 119a on movement direction one side (the first stationary spiral element) and a side opposite with movement direction just contacts with each other like this.As a result, the rotation of the integral type of second piston 125 and nut 129 will stop.
Under this situation, as shown in figure 15, second piston 125 and nut 129 be via engaging friction clutch FC integrator, like this contact segment between the thread surface of the thread surface of male thread portion 127a (the second stationary spiral element) and female thread portion 129a (the second removable helix element) will and the thread surface of female thread portion 119a (the first stationary spiral element) and male thread portion 125a (the first removable helix element) between contact segment push away outwardly away from each other.Therefore, under this situation, even the hydrodynamic pressure in the first hydraulic chamber R1 reduces owing to ECU (Electrical Control Unit) ECU makes brake fluid pressure control unit CU that its situation is changed into pressure release situation from force applications control situation, therefore and brake block 113a is applied to the reaction force extrusion piston 119 backward on the piston 119, and the situation that above-mentioned two contact segments push away (wherein thread surface in each contact segment the situation of extruding contact) each other outwardly away from each other also can remain unchanged.
Therefore, discharging with the time as the brake fluid pressure of the braking equipment A3 joint operation of parking brake, utilization is applied to the mode that the reaction force on the piston 119 can not slide with brake block 113a parameter of structure design is set in friction clutch FC and above-mentioned two contact segments, piston 119 just can not be extruded backward and remain under the mechanical caging situation along cylinder-bore axis.Therefore, when discharging brake fluid pressure, can avoid the reduction of the stopping brake power of braking equipment A3.
Simultaneously, when ECU (Electrical Control Unit) ECU make brake fluid pressure control unit CU with its situation when force applications control situation is changed into pressure and is discharged the control situation, changing valve 141 is remained under the outage condition by ECU (Electrical Control Unit) ECU.Therefore, discharge to hydraulic pressure branch line 123b via safety check 141a from the brake fluid that the second hydraulic chamber R2 flows into storage tank 143 via aforesaid operations (operation shown in Figure 13 to 15).
Parking brake switch SW under being in the ON situation transfers OFF to so that the operation of the 3rd embodiment's combined type and stopping brake device A 3 are discharged from be used as parking brake, parking brake is with such release as described below.At first, changing valve 141 is remained under the situation of outage condition by ECU (Electrical Control Unit) ECU therein, ECU (Electrical Control Unit) ECU brings brake fluid pressure control unit CU into force applications control situation, like this brake fluid of brake fluid pressure control unit CU under the pressure that the first and second hydraulic chamber R1 and the R2 of braking equipment A3 supply with predetermined quantity.
When the piston power of stretching out that is caused by fluid pressure becomes when being applied to above-mentioned reaction force on the piston 119 greater than brake block 113a; The thread surface of female thread portion 119a (the first stationary spiral element) contacts with extruding between the thread surface of male thread portion 125a (the first removable screw element) and is cancelled, and has therefore cancelled the state that the contact portion between the thread surface of the thread surface of the contact portion of thread surface of the thread surface of male thread portion 127a (the second stationary spiral element) wherein and female thread portion 129a (the second removable screw element) and female thread portion 119a (the first stationary spiral element) and male thread portion 125a (the first removable screw element) pushes away outwardly away from each other.
Under this situation, shown in Figure 16 to 18, the biasing force of second spring 135 moves and rotates with the one situation via friction clutch FC to its initial position separately along cylinder-bore axis with regard to making second piston 125 and nut 129.As a result, rebulid the identical situation of situation (Figure 13) of the above-mentioned stopping brake operation starting stage that is activated with force applications wherein.At second piston 125 and nut 129 from the starting stage of its non-initial position separately to its initial position motion separately, second piston 125 and nut 129 move and rotation simultaneously, and according to the helical pitch of female thread portion 119a (the first stationary spiral element) and the helical pitch of male thread portion 125a (the first removable helix element).In the middle and later periods of motion, second piston 125 and nut 129 can move, and simultaneously can be according to the helical pitch of male thread portion 127a (the second stationary spiral element) and the helical pitch rotation of female thread portion 129a (the second removable helix element).
After second piston 125 and nut 129 return its initial position separately owing to the biasing force of second spring 135, ECU (Electrical Control Unit) ECU makes brake fluid pressure control unit CU that its situation is changed into pressure release control situation from force applications control situation, therefore allows brake fluid to excrete from the first and second hydraulic chamber R1 and R2.Therefore, because above-mentioned withdrawal function, the braking that piston 119 and removable card caliper brake 117 return shown in Fig. 8 or 12 discharges situation, therefore discharges parking brake.
In the 3rd embodiment's combined type operation and stopping brake device A 3, hydraulic pressure official post second piston 125 that occurs between the first hydraulic chamber R1 and the second hydraulic chamber R2 and nut 129 move to its non-initial position separately shown in Figure 15 against second spring 135 along cylinder-bore axis from its initial position separately shown in Figure 13, so just do not have electric installation to be contained among the hydraulic chamber Ro of cylinder 117a of removable card caliper brake 117.Therefore, just need not, therefore higher reliability is provided to braking equipment A3 considers any fluid resistance relevant with electric installation, sealing integrity, thermal resistance etc.
In the 3rd embodiment's combined type operation and stopping brake device A 3, storage tank 143 is connected on the changing valve 141, and when the connection between the first hydraulic chamber R1 and the second hydraulic chamber R2 was closed, storage tank 143 can be stored the brake fluid of discharging from the second hydraulic chamber R2.Therefore, under the situation that connection between the first hydraulic chamber R1 and the second hydraulic chamber R2 therein is converted valve 141 when closing, when brake fluid supplies among the first hydraulic chamber R1 under pressure, act on the first hydraulic chamber R1 on second piston 125 and the hydraulic difference between the second hydraulic chamber R2 and just may increase, so just can strengthen the operation response of second piston 125.Therefore, can strengthen the operation response of parking brake.
In above-mentioned the 3rd embodiment, the female thread portion 119a of piston 119 serves as the first stationary spiral element; The male thread portion 125a of second piston 125 serves as the first removable helix element; The male thread portion 127a of thread spindle 127 serves as the second stationary spiral element; And the female thread portion 129a of nut 129 serves as the second removable helix element.Yet male thread portion and female thread portion can exchange.In the 3rd embodiment, the diameter of the first stationary spiral element and the first removable helix element equals the diameter of the second stationary spiral element and the second removable helix element substantially.Yet their diameter also can differ from one another.
Above-mentioned the 3rd embodiment has used single changing valve 141, and described changing valve is 23 logical electromagnetic change-over valves.Changing valve 141 is set up the connection between the first hydraulic chamber R1 and the second hydraulic chamber R2 when outage, and connection and the permission brake fluid of changing valve 141 between the closed in electrified state first hydraulic chamber R1 and the second hydraulic chamber R2 flows to storage tank 143 from the second hydraulic chamber R2.Yet, the present invention also can be implemented as and uses following changing valve: described changing valve is set up the connection between the first hydraulic chamber R1 and the second hydraulic chamber R2 when energising, and closes the connection between the first hydraulic chamber R1 and the second hydraulic chamber R2 and allow brake fluid to flow to storage tank 143 from the second hydraulic chamber R2 when outage.Under these situations, for example, can use two 22 logical electromagnetic change-over valves.
In above-mentioned the 3rd embodiment, hydraulic pressure official post second piston 125 that produces owing to the changing valve 141 of operation between the first hydraulic chamber R1 and the second hydraulic chamber R2 overcomes second spring 135 and moves to its non-initial position along cylinder-bore axis from its initial position.Yet the present invention can be implemented as magnetic force that use produces by the electromagnetic actuators that is connected on the cylinder (117a) and makes second piston (125) overcome second spring (135) to move to its non-initial position along cylinder-bore axis from its initial position.
In above-mentioned the 3rd embodiment, when braking equipment A3 was used as parking brake, brake fluid pressure control unit CU supplied with the brake fluid under pressure in the first and second hydraulic chamber R1 and R2.Yet the present invention can be implemented as when braking equipment A3 is used as parking brake, and master cylinder MC supplies with the brake fluid under pressure in the first and second hydraulic chamber R1 and R2.
Figure 19 has schematically shown the fourth embodiment of the present invention.Operation of combined type among the 4th embodiment and stopping brake device A 4 are used for 4 each left rear wheel and the off hind wheels (one of them does not show) of taking turns brake system of car.Braking system comprises master cylinder MC and brake fluid pressure control unit CU, and master cylinder can be operated according to the operation of the brake pedal BP that will be stepped on, and the brake fluid pressure control unit can be carried out brake control and traction control.Braking system is that each the near front wheel and off-front wheel use common disc brake apparatus (not shown).
Combined type operation and stopping brake device A 4 comprise inner liner 213 and outer liner 215, they are used for clamping discal rotor 211 (it and unshowned wheel rotate integratedly and serve as the rotatable member that will be braked) from opposite side, thereby realize brake operating on discal rotor 211; Removable card caliper brake 217 is used to make liner 213 and 215 to move to discal rotor 211 under pressure; And cup piston 219. Liner 213 and 215 and removable card caliper brake 217 all be connected on the fixing frame (not shown), fixing frame is connected on the car body, its mode is for sliding along rotor shaft.
In the 4th embodiment, second piston 225, thread spindle 227 and nut 229 are installed among the cylinder 217a of removable card caliper brake 217; And first spring 231, thrust bearing 232, second spring 233 and thrust bearing 234 are connected on the cylinder 217a.Changing valve 241 is installed in from the hydraulic pressure branch line 223b of hydraulic pipe line 223a branch.Storage tank 243 is connected on the changing valve 241.
In hydraulic chamber Ro, second piston 225 is connected on the cylinder 217a via seal cup 226, its mode is and can move between its initial position and Qi Fei initial position along cylinder-bore axis around the cylinder-bore axis rotation, therefore hydraulic chamber Ro is divided into the first hydraulic chamber R1 and the second hydraulic chamber R2.The first hydraulic chamber R1 is connected to hydraulic pipe line 223a and goes up and allow brake fluid to supply to wherein via hydraulic pipe line 223a and discharge thus.The second hydraulic chamber R2 is connected to hydraulic pressure branch line 223b and goes up and allow brake fluid to supply to wherein via hydraulic pressure branch line 223b and discharge thus.
The female thread portion 219a that is provided with in the piston 219 is the first stationary spiral element, and it has predetermined helical pitch and can be exposed among the first hydraulic chamber R1 when cylinder-bore axis extends.The male thread portion 225a of second piston 225 is the first removable helix element, it and the female thread portion 219a engagement that in piston 219, sets, and there is the predetermined thread pitch that is threaded into therein, and has the opposite thread surface of thread surface with the female thread portion 219a that in piston 219, sets along cylinder-bore axis.
Friction clutch FC allows joint and the disengaging between second piston 225 and the nut 229.Under the disengaging situation when second piston 225 and nut 229 are maintained at it initial position breaks away from simultaneously each other separately, friction clutch FC allows the relative rotation between second piston 225 and the nut 229.Move intended distance and during with joint that nut 229 engage, friction clutch FC will limit relative rotation second piston 225 and nut 229 between from its initial position to its non-initial position at second piston 225.
Changing valve 241 is 23 logical electromagnetic change-over valves, and its energising and outage are controlled by ECU (Electrical Control Unit) ECU.Changing valve 241 is installed among the hydraulic pressure branch line 223b, hydraulic pressure branch line 223b permission brake fluid is supplied with the second hydraulic chamber R2 and is discharged from the second hydraulic chamber R2, and, thereby allow brake fluid to supply with or discharge from the first hydraulic chamber R1 to the first hydraulic chamber R1 from hydraulic pipe line 223a branch.Changing valve 241 can set up and cut out between the first hydraulic chamber R1 and the second hydraulic chamber R2 and the connection between the second hydraulic chamber R2 and the storage tank 243.When changing valve 241 outages, changing valve 241 is set up the connection between the first hydraulic chamber R1 and the second hydraulic chamber R2, and the safety check 241a that is included in the changing valve 241 can prevent brake oil flow storage tank 243.When changing valve 241 energisings, changing valve 241 cuts out the connection between the first hydraulic chamber R1 and the second hydraulic chamber R2, and sets up the connection between the second hydraulic chamber R2 and the storage tank 243, thereby allows the brake oil flow storage tank 243 from the second hydraulic chamber R2.
During vehicle driving, brake fluid pressure control unit CU can carry out brake control and traction control and control in known manner by ECU (Electrical Control Unit) ECU simultaneously.At the vehicle stopping period, brake fluid pressure control unit CU can the control combination formula operation of operation and stopping brake device A 4, and combined type moves and stopping brake device A 4 is controlled based on the parking brake switch SW by ECU (Electrical Control Unit) ECU with changing valve 241.Because the configuration of brake fluid pressure control unit CU is known, omitted its explanation.
Thereby being transferred to OFF in the parking brake switch SW uses the combined type operation and 4 conducts of stopping brake device A of such configuration of the 4th embodiment to move under the situation of breaks, changing valve 241 is de-energized, such first hydraulic chamber R1 is communicated with each other all the time with the second hydraulic chamber R2 and has identical pressure, and the safety check 241a that is included in the changing valve 241 prevents that brake fluid from flowing to storage tank 243 from hydraulic pressure branch road 223b.
Under this situation (travelling brake operational condition), the hydraulic difference between the first hydraulic chamber R1 and the second hydraulic chamber R2 is always zero, and the extruding force that is caused by hydraulic difference just can not act on second piston 225 like this.Therefore, as shown in figure 19, spring 233 and 235 acting in conjunction are clamped on its initial position separately second piston 225 and nut 229, and friction clutch FC keeps separating.
Under this travelling brake operational condition, when brake pedal BP was stepped on, master cylinder MC supplied with hydraulic pipe line 223a with the brake fluid under the pressure via brake fluid pressure control unit CU; Brake fluid supplies to the first hydraulic chamber R1 from hydraulic pipe line 223a under pressure; And brake fluid supplies to the second hydraulic chamber R2 via hydraulic pressure branch line 223b and changing valve 241 from hydraulic pipe line 223a under pressure.
At this moment, therefore, as shown in figure 20, although second piston 225 and nut 229 keep motionless, but, by utilize the brake fluid that supplies among the first hydraulic chamber R1 and the second hydraulic chamber R2 under pressure, piston 219 can advance along cylinder-bore axis and surpass female thread portion 219a and the scope that is threaded into thread pitch between the male thread portion 225a of second piston 225 that sets in piston 219.In other words, braking equipment A4 can be used as the operation brake service.
At this moment, supplying to brake fluid among the first hydraulic chamber R1 under pressure causes piston 219 211 to move along cylinder-bore axis towards discal rotor, and piston 219 makes piston packing 221 towards discal rotor 211 distortion simultaneously, therefore inner liner 213 is pressed on the discal rotor 211.Relevant reaction force will make calliper 217 move to the inside, and the reaction applicator part 217b of removable card caliper brake 217 just is pressed in outer liner 215 on the discal rotor 211 like this.Support pad 213 and 215 unshowned fixing frame just receive because the power that two liners 213 and 215 extruding discal rotors 211 generate, and therefore generation prevents the braking force that discal rotor 211 rotates.Under the situation of this brake actuating, removable card caliper brake 217 and the just deflection of other correlated parts member according to the supply that is in the brake fluid under the pressure.
By because the release of brake pedal BP when having eliminated the release of the brake fluid pressure that supply realized from master cylinder MC to the first and second hydraulic chamber R1 and R2 at the brake fluid under the pressure, can cause piston 219 to move to the inside by piston packing 221 from the withdrawal function of above-mentioned distortion realization with by removable card caliper brake 217 and other correlated parts member recover to be realized from deflection withdrawal function, and cause removable card caliper brake 217 to move laterally.Therefore, brake actuating situation shown in Figure 20 just returns to the braking shown in Figure 19 and discharges situation, therefore will discharge the situation of liner 213 and 215 on being pressed in discal rotor 211.Therefore cancelled braking spinning movement by two liners 213 and 215 discal rotors of realizing 211.
Under the above-mentioned brake operating condition of travelling, for example, because the wearing and tearing of brake block 213a and 215a, when piston 219 advance along cylinder-bore axis one section with female thread portion 219a that in piston 219, sets and the male thread portion 225a that in second piston 225, sets between be threaded into that thread pitch equates or longer apart from the time, just set up as shown in figure 22 situation via as shown in figure 21 situation, and second piston 225 is in the rotation of its initial position, therefore is adjusted in the length of action between the male thread portion 225a of the female thread portion 219a that sets in the piston 219 and second piston 225 automatically.
After length of action between the male thread portion 225a of the female thread portion 219a that sets in piston 219 and second piston 225 is regulated, cooperate with the release of brake fluid pressure from the first and second hydraulic chamber R1 and R2, above-mentioned withdrawal function can cause piston 219 to move to the inside, and causes removable card caliper brake 117 to move laterally.Therefore, the brake actuating situation among Figure 22 just returns to the braking release situation among Figure 23.
Parking brake switch SW under being in the OFF situation transfers ON to so that the operation of the 4th embodiment's combined type and stopping brake device A 4 are used as parking brake, will operate by execution stopping brake as described below: at first, when changing valve 241 is brought outage condition into by ECU (Electrical Control Unit) ECU, ECU (Electrical Control Unit) ECU makes brake fluid pressure control unit CU enter force applications control situation, by this brake fluid of brake fluid pressure control unit CU under the pressure that the first and second hydraulic chamber R1 and the R2 of braking equipment A4 supply with predetermined quantity.
So similar operation in the situation that brake pedal BP is operated under acquisition and the above-mentioned brake operating condition of travelling.Braking equipment A4 can be used as the parking brake operation.Subsequently, brake fluid is supplied with under the situation of the first hydraulic chamber R1 that brakes device A 4 from brake fluid pressure control unit CU under pressure therein, when the pressure of supplying with the brake fluid of braking device A 4 from brake fluid pressure control unit CU reaches predetermined value, as shown in figure 24, ECU (Electrical Control Unit) ECU makes changing valve 241 energisings, therefore allows brake fluid to flow into storage tank 243 from the second hydraulic chamber R2.
Under this situation, between the first hydraulic chamber R1 and the second hydraulic chamber R2, can produce hydraulic difference, such second piston 225 will overcome second spring 233 and move to as shown in figure 26 its non-initial position along cylinder-bore axis from as shown in figure 24 its initial position.When second piston 225 moves intended distance or more for a long time, second piston 225 will engage with nut 229 from its initial position to its non-initial position, friction clutch FC will mesh like this.Subsequently, the biasing force of the 3rd spring 235 will be clamped in friction clutch FC under the connecting state.Therefore, the friction clutch FC of joint can limit the relative rotation between second piston 225 and the nut 229, and second piston 225 and nut 229 can move and rotate with the one situation simultaneously along cylinder-bore axis.
Simultaneously, in braking equipment A4, the helical pitch of the mate between the female thread portion 229a (the second removable helix element) of male thread portion 227a of thread spindle 227 (the second stationary spiral element) and nut 229 is shorter slightly than the mate between the male thread portion 225a (the first removable helix element) of the female thread portion 219a that sets in piston 219 (the first stationary spiral element) and second piston 225.Therefore, when second piston 225 and nut 229 move and when rotating with the one situation via friction clutch FC simultaneously along cylinder-bore axis, as shown in figure 25, the thread pitch that is threaded in the mate of cylinder-bore axis between the female thread portion 229a of male thread portion 227a of thread spindle 227 (the second stationary spiral element) and nut 229 (the second removable helix element) will disappear in the side towards the movement direction of female thread portion 229a, just contacts with each other with female thread portion 229a (the second removable helix element) on movement direction one side in the thread surface of the male thread portion 227a on the side opposite with movement direction (the second stationary spiral element) like this.Subsequently, as shown in figure 26, the thread pitch that is threaded in the mate of cylinder-bore axis between the male thread portion 225a of the screw section of piston 219 219a (the first stationary spiral element) and second piston 225 (the first removable helix element) disappears on a side opposite with the movement direction of male thread portion 225a, and the thread surface of the female thread portion 219a (the first stationary spiral element) on movement direction one side and the thread surface of the male thread portion 225a on a side opposite with movement direction (the first removable helix element) just contact with each other like this.As a result, the rotation of the integral type of second piston 225 and nut 229 will stop.
Under this situation, as shown in figure 26, second piston 225 and nut 229 be via the friction clutch FC integrator that engages, like this contact segment between the thread surface of the thread surface of male thread portion 227a (the second stationary spiral element) and female thread portion 229a (the second removable helix element) will and the thread surface of female thread portion 219a (the first stationary spiral element) and male thread portion 225a (the first removable helix element) between contact segment push away outwardly away from each other.Therefore, under this situation, even the hydrodynamic pressure in the first hydraulic chamber R1 reduces owing to ECU (Electrical Control Unit) ECU makes brake fluid pressure control unit CU that its situation is changed into pressure release situation from force applications control situation, therefore and brake block 213a is applied to the reaction force extrusion piston 219 backward on the piston 219, and the situation that above-mentioned two contact segments are stretched out against each other (wherein thread surface in each contact segment the situation of extruding contact) each other also can remain unchanged.
Therefore, discharging with the time as the brake fluid pressure of the braking equipment A4 joint operation of parking brake, utilization is applied to the mode that the reaction force on the piston 219 can not slide with brake block 213a parameter of structure design is set in friction clutch FC and above-mentioned two contact segments, piston 219 just can not be extruded backward and remain under the mechanical caging situation along cylinder-bore axis.Therefore, when discharging brake fluid pressure, can avoid the reduction of the stopping brake power of braking equipment A4.
Simultaneously, when ECU (Electrical Control Unit) ECU make brake fluid pressure control unit CU with its situation when force applications control situation is changed into pressure and is discharged the control situation, changing valve 241 is remained under the outage condition by ECU (Electrical Control Unit) ECU.Therefore, discharge to hydraulic pressure branch line 223b via safety check 241a from the brake fluid that the second hydraulic chamber R2 flows into storage tank 243 via aforesaid operations (operation shown in Figure 24 to 26).
Parking brake switch SW under being in the ON situation transfers OFF to so that the operation of the 4th embodiment's combined type and stopping brake device A 4 are discharged from be used as parking brake, parking brake is with such release as described below.At first, changing valve 241 is remained under the situation of outage condition by ECU (Electrical Control Unit) ECU therein, ECU (Electrical Control Unit) ECU makes brake fluid pressure control unit CU enter force applications control situation, and brake fluid pressure control unit CU is just to the first and second hydraulic chamber R1 of braking equipment A4 and the brake fluid under the R2 supply pressure like this.
When the piston power of stretching out that is caused by fluid pressure becomes when being applied to above-mentioned reaction force on the piston 219 greater than brake block 213a; The thread surface of female thread portion 219a (the first stationary spiral element) contacts with extruding between the thread surface of male thread portion 225a (the first removable screw element) and is cancelled, and has therefore cancelled the situation that the contact portion between the thread surface of the thread surface of contact portion between the thread surface of the thread surface of male thread portion 227a (the second stationary spiral element) wherein and female thread portion 229a (the second removable screw element) and female thread portion 219a (the first stationary spiral element) and male thread portion 225a (the first removable screw element) pushes away outwardly away from each other.
Under this situation, shown in Figure 27 to 29, spring 233 and 235 biasing force move and rotate with the one situation via friction clutch FC to its initial position separately along cylinder-bore axis with regard to making second piston 225 and nut 229.As a result, rebulid the identical situation of situation (Figure 24) of the above-mentioned stopping brake operation starting stage that is activated with force applications wherein.At second piston 225 and nut 229 from the starting stage of its non-initial position separately to its initial position motion separately, second piston 225 and nut 229 move and rotation simultaneously, and according to the helical pitch of female thread portion 219a (the first stationary spiral element) and the helical pitch of male thread portion 225a (the first removable helix element).In the middle and later periods of motion, second piston 225 and nut 229 can move, and simultaneously can be according to the helical pitch of male thread portion 227a (the second stationary spiral element) and the helical pitch rotation of female thread portion 229a (the second removable helix element).After nut 229 reached its initial position, friction clutch FC separated, and had only second piston 225 to move towards its initial position along cylinder owing to the biasing force of second spring 233.
After second piston 225 and nut 229 return its initial position separately owing to the biasing force of spring 233 and 235, ECU (Electrical Control Unit) ECU makes brake fluid pressure control unit CU that its situation is changed into pressure release control situation from force applications control situation, therefore allows brake fluid to excrete from the first and second hydraulic chamber R1 and R2.Therefore, because above-mentioned withdrawal function, the braking that piston 219 and removable card caliper brake 217 return shown in Figure 19 or 23 discharges situation, therefore discharges parking brake.
In the 4th embodiment's combined type operation and stopping brake device A 4, hydraulic pressure official post second piston 225 that occurs between the first hydraulic chamber R1 and the second hydraulic chamber R2 and nut 229 overcome spring 233 and 235 and move to its non-initial position separately shown in Figure 26 along cylinder-bore axis from its initial position separately shown in Figure 24, so just do not have electric installation to be contained among the hydraulic chamber Ro of cylinder 217a of removable card caliper brake 217.Therefore, just need not, therefore higher reliability is provided to braking equipment A4 considers any fluid resistance relevant with electric installation, sealing integrity, thermal resistance etc.
In the 4th embodiment's combined type operation and stopping brake device A 4, storage tank 243 is connected on the changing valve 241, and when the connection between the first hydraulic chamber R1 and the second hydraulic chamber R2 was closed, storage tank 243 can be stored the brake fluid of discharging from the second hydraulic chamber R2.Therefore, under the situation that connection between the first hydraulic chamber R1 and the second hydraulic chamber R2 therein is converted valve 241 when closing, when brake fluid supplies among the first hydraulic chamber R1 under pressure, act on the first hydraulic chamber R1 on second piston 225 and the hydraulic difference between the second hydraulic chamber R2 and just may increase, so just can strengthen the operation response of second piston 225.Therefore, can strengthen the operation response of parking brake.
In the 4th embodiment's combined type operation and the situation of stopping brake device A 4 as the operation break, even when regulating, second piston 225 and nut 229 also are clamped on its initial position separately, and friction clutch FC will keep separating like this.Therefore, utilize the pressure that supplies to the brake fluid among the first hydraulic chamber R1 under pressure, piston 219 just can move under pressure effectively.
In above-mentioned the 4th embodiment, the female thread portion 219a of piston 219 serves as the first stationary spiral element; The male thread portion 225a of second piston 225 serves as the first removable helix element; The male thread portion 227a of thread spindle 227 serves as the second stationary spiral element; And the female thread portion 229a of nut 229 serves as the second removable helix element.Yet male thread portion and female thread portion can exchange.In the 4th embodiment, the diameter of the first stationary spiral element and the first removable helix element equals the diameter of the second stationary spiral element and the second removable helix element substantially.Yet their diameter also can differ from one another.
Above-mentioned the 4th embodiment comprises storage tank 243; Yet the present invention can realize and need not to use these parts.In the embodiment who does not use storage tank 243, utilize for example expansion realization and the storage tank 243 similar functions of hydraulic pressure branch line 223b, and changing valve 241 adopts the form of 22 energising magnetic on-off valves.Above-mentioned the 4th embodiment describes the disk type braker (it is the break of discal rotor with the rotatable member that is braked) of applying for of the present invention; Yet the present invention can carry out suitable modification and be applied on the drum brake (it is the break of brake drum with the rotatable member that is braked).
Above-mentioned the 4th embodiment has used single changing valve 241, and described changing valve is 23 logical electromagnetic change-over valves.Changing valve 241 is set up the connection between the first hydraulic chamber R1 and the second hydraulic chamber R2 when outage, and connection and the permission brake fluid of changing valve 241 between the closed in electrified state first hydraulic chamber R1 and the second hydraulic chamber R2 flows to storage tank 243 from the second hydraulic chamber R2.Yet, the present invention also can be implemented as and uses following changing valve: described changing valve is set up the connection between the first hydraulic chamber R1 and the second hydraulic chamber R2 when energising, and closes the connection between the first hydraulic chamber R1 and the second hydraulic chamber R2 and allow brake fluid to flow to storage tank 243 from the second hydraulic chamber R2 when outage.Under these situations, for example, can use two 22 logical electromagnetic change-over valves.
In above-mentioned the 4th embodiment, hydraulic pressure official post second piston 225 that produces owing to the changing valve 241 of operation between the first hydraulic chamber R1 and the second hydraulic chamber R2 overcomes second spring 235 and moves to its non-initial position along cylinder-bore axis from its initial position.Yet the present invention can be implemented as magnetic force that use produces by the electromagnetic actuators that is connected on the cylinder (217a) and makes second piston (225) overcome second spring (235) to move to its non-initial position along cylinder-bore axis from its initial position.
In above-mentioned the 4th embodiment, when braking equipment A4 was used as parking brake, brake fluid pressure control unit CU supplied to the brake fluid under the pressure among the first and second hydraulic chamber R1 and the R2.Yet the present invention can be implemented as when braking equipment A4 is used as parking brake, and master cylinder MC supplies with the brake fluid under pressure in the first and second hydraulic chamber R1 and R2.
Claims (11)
1. a combined type moves and stopping brake equipment, comprising:
Piston, this piston with around cylinder-bore axis rotatable and along cylinder-bore axis movably mode be arranged in the cylinder, in cylinder, form hydraulic chamber thus;
Brake block, when mobile, this brake block is moved by piston under pressure and engages with the rotatable member that will be braked, and realizes brake operating thus on rotatable member under the pressure of the brake fluid in piston is supplying to hydraulic chamber;
Second piston, this second piston is arranged in the hydraulic chamber in mode rotatable around cylinder-bore axis and that can move between its initial position and non-initial position along cylinder-bore axis, thus hydraulic chamber is divided into first hydraulic chamber and second hydraulic chamber, second piston is limited to initial position along the mobile of piston projected direction, and the biased device of second piston promotes to initial position along cylinder-bore axis from non-initial position;
The first stationary spiral element, this first stationary spiral element and piston are arranged in first hydraulic chamber integratedly, extend along cylinder-bore axis, and have predetermined helical pitch;
The first removable helix element, this first removable helix element has the thread surface relative with the thread surface of the first stationary spiral element, be provided with integratedly with second piston, and be meshed with the first stationary spiral element, between the two, have predetermined screw thread double thread gap along cylinder-bore axis simultaneously;
Friction clutch, this friction clutch can with second piston and cylinder be engaged with each other and second piston and cylinder are broken away from each other, friction clutch becomes disengaged position and is maintained at second piston and allows second piston rotation when initial position breaks away from cylinder thus, and friction clutch becomes jointing state and forbids second piston rotation at second piston from initial position when non-initial position moves and engages with cylinder; And
Changing valve, this changing valve is arranged in the hydraulic pressure branch line, this hydraulic pressure branch line allows brake fluid to supply to second hydraulic chamber by it and discharges from second hydraulic chamber by it, and from allowing brake fluid to supply to first hydraulic chamber and pass through it from the hydraulic pipe line branch that first hydraulic chamber is discharged by it, changing valve can be set up to be communicated with also between first hydraulic chamber and second hydraulic chamber and can cut off this connection.
2. combined type operation as claimed in claim 1 and stopping brake equipment, wherein, one is used for being installed to cylinder from the releasing device of cylinder outside rotation second piston.
3. combined type as claimed in claim 1 operation and stopping brake equipment, wherein, a storage tank is connected on the changing valve, and the connection between first hydraulic chamber and second hydraulic chamber is when being cut off, and storage tank can be preserved from the brake fluid of second hydraulic chamber discharge.
4. combined type operation as claimed in claim 1 and stopping brake equipment, wherein, the first stationary spiral element is an internal thread, and the first removable helix element is externally threaded.
5. combined type operation as claimed in claim 1 and stopping brake equipment, wherein, the first stationary spiral element is externally threaded, and the first removable helix element is an internal thread.
6. a combined type moves and stopping brake equipment, comprising:
Piston, this piston with around cylinder-bore axis rotatable and along cylinder-bore axis movably mode be arranged in the cylinder, in cylinder, form hydraulic chamber thus;
Brake block, when piston outwards when mobile is supplying under the pressure of brake fluid of hydraulic chamber, this brake block is moved by piston under pressure, and engages with the rotatable member that will be braked, and realizes brake operating thus on rotatable member;
Displaceable element, this displaceable element is arranged in the hydraulic chamber in mode rotatable around cylinder-bore axis and that can move between its initial position and non-initial position along cylinder-bore axis, displaceable element mobile on the piston projected direction is limited to initial position, and displaceable element is promoted to non-initial position along cylinder-bore axis from initial position by first biased member;
The first stationary spiral element, this first stationary spiral element and piston are arranged in the hydraulic chamber integratedly, extend along cylinder-bore axis, and have predetermined helical pitch;
The first removable helix element, this first removable helix element has the thread surface relative with the thread surface of the first stationary spiral element, be provided with integratedly with displaceable element, and be meshed with the first stationary spiral element, between the two, have predetermined screw thread double thread gap along cylinder-bore axis simultaneously;
The second stationary spiral element, this second stationary spiral element and the first stationary spiral element are arranged in the hydraulic chamber coaxially, are provided with integratedly with cylinder, extend along cylinder-bore axis, and have the helical pitch shorter than the helical pitch of the first stationary spiral element;
The second removable helix element, this second removable helix element has the thread surface relative with the thread surface of the second stationary spiral element, with rotatable around cylinder-bore axis and along cylinder-bore axis movably mode be arranged in the hydraulic chamber, be meshed with the second stationary spiral element, simultaneously between the two, there is screw thread double thread gap along cylinder-bore axis, and overcome first biased member by second biased member and promote along cylinder-bore axis, wherein the biasing force of second biased member is greater than the biasing force of first biased member;
Friction clutch, this friction clutch can with the second removable helix element and displaceable element be engaged with each other and the second removable helix element and displaceable element are broken away from each other, and friction clutch becomes disengaged position and overcomes at the second removable helix element and allows when second biased member moves away from displaceable element to relatively rotate between the second removable helix element and the displaceable element; And friction clutch becomes jointing state, and when the second removable helix element engages by the promotion of second biased member and with displaceable element, limits relatively rotating between the second removable helix element and the displaceable element; And
Drive unit, this drive unit can overcome second biased member displaceable element and the second removable helix element are moved to their non-initial positions separately from their initial positions separately.
7. combined type operation as claimed in claim 6 and stopping brake equipment, wherein, displaceable element is second piston, this second piston with rotatable around cylinder-bore axis and along cylinder-bore axis movably mode be arranged in the hydraulic chamber, thus hydraulic chamber is divided into first hydraulic chamber and second hydraulic chamber; And
Drive unit is a changing valve, this changing valve is arranged in the hydraulic pressure branch line, this hydraulic pressure branch line allows brake fluid to supply to second hydraulic chamber by it and discharges from second hydraulic chamber by it, and from allowing brake fluid to supply to first hydraulic chamber and pass through it from the hydraulic pipe line branch that first hydraulic chamber is discharged by it, changing valve can be set up to be communicated with also between first hydraulic chamber and second hydraulic chamber and can cut off this connection.
8. combined type operation as claimed in claim 7 and stopping brake equipment, wherein, a storage tank is connected on the changing valve, and when the connection between first hydraulic chamber and second hydraulic chamber was cut off, storage tank can be preserved the brake fluid of discharging from second hydraulic chamber.
9. a combined type moves and stopping brake equipment, comprising:
Piston, this piston with around cylinder-bore axis rotatable and along cylinder-bore axis movably mode be arranged in the cylinder, in cylinder, form hydraulic chamber thus;
Brake block, when piston outwards when mobile is supplying under the pressure of brake fluid of hydraulic chamber, this brake block is moved by piston under pressure, and engages with the rotatable member that will be braked, and realizes brake operating thus on rotatable member;
Displaceable element, this displaceable element is arranged in the hydraulic chamber in mode rotatable around cylinder-bore axis and that can move between its initial position and non-initial position along cylinder-bore axis, displaceable element mobile on the piston projected direction is limited to initial position, and displaceable element is promoted to non-initial position along cylinder-bore axis from initial position by first biased member, and displaceable element is promoted to initial position from non-initial position along cylinder-bore axis by second biased member, and wherein the biasing force of second biased member is greater than the biasing force of first biased member;
The first stationary spiral element, this first stationary spiral element and piston are arranged in the hydraulic chamber integratedly, extend along cylinder-bore axis, and have predetermined helical pitch;
The first removable helix element, this first removable helix element has the thread surface relative with the thread surface of the first stationary spiral element, be provided with integratedly with displaceable element, and be meshed with the first stationary spiral element, between the two, have predetermined screw thread double thread gap along cylinder-bore axis simultaneously;
The second stationary spiral element, this second stationary spiral element and the first stationary spiral element are arranged in the hydraulic chamber coaxially, are provided with integratedly with cylinder, extend along cylinder-bore axis, and have the helical pitch shorter than the helical pitch of the first stationary spiral element;
The second removable helix element, this second removable helix element has the thread surface relative with the thread surface of the second stationary spiral element, with rotatable around cylinder-bore axis and along cylinder-bore axis movably mode be arranged in the hydraulic chamber, be meshed with the second stationary spiral element, between the two, there is predetermined screw thread double thread gap along cylinder-bore axis simultaneously, the second removable helix element mobile on the piston projected direction is limited to its initial position, and the second removable helix element is promoted to initial position by the 3rd biased member;
Friction clutch, this friction clutch can with the second removable helix element and displaceable element be engaged with each other and the second removable helix element and displaceable element are broken away from each other, and friction clutch becomes disengaged position and remains at displaceable element and the second removable helix element and allows to relatively rotate between the second removable helix element and the displaceable element when their initial positions separately break away from thus each other; And friction clutch becomes jointing state, and move intended distance or farther and when engaging from its initial position to its non-initial position with the second removable helix element at displaceable element, limit relatively rotating between the second removable helix element and the displaceable element; And
Drive unit, this drive unit can overcome second biased member displaceable element is moved to its non-initial position along cylinder-bore axis from its initial position when friction clutch is in disengaged position, and can overcome the second and the 3rd biased member when friction clutch is in jointing state displaceable element and the second removable helix element are moved to separately non-initial position along cylinder-bore axis.
10. combined type operation as claimed in claim 9 and stopping brake equipment, wherein, displaceable element is second piston, this second piston with rotatable around cylinder-bore axis and along cylinder-bore axis movably mode be arranged in the hydraulic chamber, thus hydraulic chamber is divided into first hydraulic chamber and second hydraulic chamber; And
Drive unit is a changing valve, this changing valve is arranged in the hydraulic pressure branch line, this hydraulic pressure branch line allows brake fluid to supply to second hydraulic chamber by it and discharges from second hydraulic chamber by it, and from allowing brake fluid to supply to first hydraulic chamber and pass through it from the hydraulic pipe line branch that first hydraulic chamber is discharged by it, changing valve can be set up to be communicated with also between first hydraulic chamber and second hydraulic chamber and can cut off this connection.
11. combined type as claimed in claim 10 operation and stopping brake equipment, wherein, a storage tank is connected on the changing valve, and the connection between first hydraulic chamber and second hydraulic chamber is when being cut off, and storage tank can be preserved from the brake fluid of second hydraulic chamber discharge.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004146394A JP4424063B2 (en) | 2004-05-17 | 2004-05-17 | Common use parking brake device |
| JP146394/04 | 2004-05-17 | ||
| JP180163/04 | 2004-06-17 | ||
| JP182072/04 | 2004-06-21 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1755158A CN1755158A (en) | 2006-04-05 |
| CN100394059C true CN100394059C (en) | 2008-06-11 |
Family
ID=35472473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100817827A Expired - Fee Related CN100394059C (en) | 2004-05-17 | 2005-05-15 | Combined service and parking brake apparatus |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4424063B2 (en) |
| CN (1) | CN100394059C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109281960A (en) * | 2017-07-21 | 2019-01-29 | 英国美瑞特重型车制动系统有限公司 | Disk brake |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010033253A1 (en) * | 2010-08-03 | 2012-02-09 | Lucas Automotive Gmbh | A vehicle brake system for a motor vehicle and method for driving the vehicle brake system when activating the parking brake function |
| DE102016214219A1 (en) * | 2016-08-02 | 2018-02-08 | Robert Bosch Gmbh | Method for servicing a brake system with hydraulic vehicle brake and electromechanical brake device |
| DE102017202813A1 (en) * | 2017-02-22 | 2018-08-23 | Audi Ag | Method for operating a brake system of a motor vehicle and corresponding brake system |
| CN113027947B (en) * | 2019-12-09 | 2022-05-13 | 比亚迪股份有限公司 | Brake caliper and vehicle |
| CN112524186B (en) * | 2020-12-21 | 2024-05-17 | 任丘市博科机电新技术有限公司 | Automatic precise gap adjusting device for full-mechanical disc brake and design method thereof |
| CN115140002B (en) * | 2021-03-30 | 2023-11-14 | 比亚迪股份有限公司 | Braking system with hydraulic parking function and vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86100835A (en) * | 1985-04-01 | 1987-09-02 | 日信工业株式会社 | Hydraulic brake brake clearance automatic compensator |
| US5350042A (en) * | 1991-06-26 | 1994-09-27 | Alfred Teves Gmbh | Automatic adjusting apparatus for a disc brake |
| JP2000504811A (en) * | 1996-02-09 | 2000-04-18 | アイティーティー・マニュファクチュリング・エンタープライゼス・インコーポレイテッド | Combined service and parking brake device |
| US6311808B1 (en) * | 1996-02-09 | 2001-11-06 | Continental Teves Ag & Co., Ohg | Combined service and parking brake system |
| US6659236B1 (en) * | 2002-06-28 | 2003-12-09 | Robert Bosch Corporation | Parking brake |
-
2004
- 2004-05-17 JP JP2004146394A patent/JP4424063B2/en not_active Expired - Fee Related
-
2005
- 2005-05-15 CN CNB2005100817827A patent/CN100394059C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86100835A (en) * | 1985-04-01 | 1987-09-02 | 日信工业株式会社 | Hydraulic brake brake clearance automatic compensator |
| US5350042A (en) * | 1991-06-26 | 1994-09-27 | Alfred Teves Gmbh | Automatic adjusting apparatus for a disc brake |
| JP2000504811A (en) * | 1996-02-09 | 2000-04-18 | アイティーティー・マニュファクチュリング・エンタープライゼス・インコーポレイテッド | Combined service and parking brake device |
| US6311808B1 (en) * | 1996-02-09 | 2001-11-06 | Continental Teves Ag & Co., Ohg | Combined service and parking brake system |
| US6659236B1 (en) * | 2002-06-28 | 2003-12-09 | Robert Bosch Corporation | Parking brake |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109281960A (en) * | 2017-07-21 | 2019-01-29 | 英国美瑞特重型车制动系统有限公司 | Disk brake |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4424063B2 (en) | 2010-03-03 |
| CN1755158A (en) | 2006-04-05 |
| JP2005325970A (en) | 2005-11-24 |
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