CN101410282B - A valve for disconnecting the front braking and/or the trailer braking, for a farm tractor or a similar vehicle - Google Patents
A valve for disconnecting the front braking and/or the trailer braking, for a farm tractor or a similar vehicle Download PDFInfo
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- CN101410282B CN101410282B CN2007800115573A CN200780011557A CN101410282B CN 101410282 B CN101410282 B CN 101410282B CN 2007800115573 A CN2007800115573 A CN 2007800115573A CN 200780011557 A CN200780011557 A CN 200780011557A CN 101410282 B CN101410282 B CN 101410282B
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Abstract
A valve (VD) intended to disconnect, in specific circumstances, the braking of the front wheels (RAS1RAD), and/or of a trailer (RI) whose braking system is connected through a trailer braking valve (VFR), for the braking system of a farm tractor or similar vehicle which comprises two master cylinders (CMS1CMD), operated by two separate braking pedals (PS1PD), directly controlling the braking of the rear wheels (RPS1RPD), and controlling the braking of the front wheels (RAS1RAD) and/or the braking device of the trailer (RI) through the disconnection valve (VD). The disconnection valve (VD) includes a body (21 ), a first (25) and a second (24) inlet connections connected to the two master cylinders, and a delivery connection (29) connected to a braking circuit of the front wheels and/or to the trailer brake valve. The valve body (21 ) has a bore (38) wherein is installed one movable piston (23) subjected to the action of the pressure applied to the first inlet connection (25), the body (21 ) comprises a normally closed interception valve (26) closing a communication between the second inlet connection (24) and the delivery connection (29), and the movable piston (23) has a member (28) which opens the interception valve (26.) when the movable piston is displaced by the pressure applied to the first inlet connection (25), then allowing communication between the second inlet connection (24) and the delivery connection (29).
Description
Technical field
The present invention relates to a kind of valve, this valve is used for disconnecting under specific circumstances the brake equipment of front-wheel and/or trailer in farm tractor or similar vehicles.
Background technology
In existing vehicle, particularly in farm tractor and similar vehicles, hydraulic brake system comprises by two master cylinderses of two independent brake foot-controlleds, the brake equipment of a vehicle front-wheel of each master cylinders control.The purpose of this arrangement is to allow front-wheel is carried out differentiated braking, is rotated for the realization u turn when carrying out farming on adjacent opposite sense trail thereby for example help vehicle.When operating two brake pedals and carry out bi-directional braking, thus usually since two independently the used oil mass difference of brake circuit system can overbalance, thereby braking also can overbalance.In order to prevent this rough sledding, be provided with a kind of transfering channel, when being used for operating at the same time two brake pedals with two brake system intercommunications.This balancing run is finished by the valve that is inserted on the master cylinder piston, closes under the described valve normal circumstances, opens when piston is movable along predefined stroke.
The vehicle that said system is housed can save the brake equipment that acts on the front-wheel and may tow trailer in brake equipment.Yet, some systems also dispose the brake equipment in front wheel brake device and/or the trailer, the latter operates by the valve that is called " trailer brake valve ", in this case, said system comprises hydraulic disconnection valve, is used for disconnecting under the situation of only operating a brake pedal brake equipment of front-wheel and/or trailer, yet, when operating two brake pedals simultaneously, four wheels of all of vehicle and/or trailer wheel all are braked.The block scheme of this brake system as shown in Figure 1, corresponding hydraulic diagram is then as shown in Figure 2.To carry out more detailed description to this system after a while.
The shortcoming of this brake system is that hydraulic disconnection valve has complicated structure, thereby has very high manufacturing and assembly cost, and relatively easy the damage.The typical case of the structure of such hydraulic disconnection valve as shown in Figure 3, its hydraulic diagram is as shown in Figure 4.To carry out more detailed description to this valve after a while.
Another defective of known system is, when the operation from this hydraulic circuit exhaust when hydraulic circuit is filled gasoline comprises complicated more step.
Therefore, main purpose of the present invention is, fully simplifies the structure of the hydraulic valve that is used to disconnect front wheel brake device and trailer brake device (if having trailer), makes and assembly cost thereby reduce, and reduces and the possibility damaged occurs.Another object of the present invention is further to improve this hydraulic valve, so that in the operation of simplifying this hydraulic circuit of cleaning when hydraulic circuit is filled gasoline.Other purpose of the present invention will be stated in the back.
Summary of the invention
The foregoing invention purpose is achieved by breakaway valve according to the present invention, this breakaway valve is used to disconnect the brake equipment of front vehicle wheel and/or trailer (if existence), described breakaway valve disconnects its brake equipment by trailer brake valve under the situation of trailer existing, described valve is used to comprise two pairs of motor vehicle braking systems that are provided with the wheel of brake equipment, be used to perhaps comprise that at least one pair of is provided with the wheel of brake equipment and the motor vehicle braking system of trailer brake valve, described vehicle comprises two master cylinderses as pump, each described master cylinders is operated by its oneself brake pedal, the brake equipment of a rear wheel of described each master cylinders direct control, brake equipment by breakaway valve control front vehicle wheel and/or trailer, described breakaway valve disconnects the brake equipment of front vehicle wheel and/or trailer under the situation of only operating a brake pedal, described breakaway valve comprises the main body with the first input interface channel and second input interface channel, the described first input interface channel and the second input interface channel all are connected to a master cylinders, described breakaway valve also comprises the transmission interface channel that is used to be connected to the front vehicle wheel brake circuit, it is characterized in that: described main body has first boring, in described first boring moveable piston is installed, described moveable piston is applied to the effect of the pressure in the described first input interface channel; Described main body comprises normally closed interception valves, and described interception valves is closed the passage between described second input interface channel and the described transmission interface channel; Described moveable piston has parts, these parts are applicable to the described interception valves of operation so that be subjected to being applied to the effect of the pressure in the described first input interface channel and open described interception valves when being moved in described moveable piston, allow subsequently to communicate between described second input interface channel and the described transmission interface channel, thereby the pressure that allows to exist in the described second input interface channel is applied to described transmission interface channel.
Preferably, described interception valves is installed along the moving direction of described moveable piston, and described moveable piston comprises lock pin, and described lock pin acts directly on and is used to open described interception valves on the described interception valves.
Advantageously, described breakaway valve comprises second piston in first boring that is inserted in described main body, and described second piston is fixed by holding member and is used to support described interception valves.
Preferably, described interception valves is the ball valve that is provided with spring, and described spring advances interception valves to off position.
Described first boring of described valve body can be closed by latch endways, and the described moveable piston that is in off-position is resisted against on the described latch, and described moveable piston is advanced to described latch direction by spring.Therefore, this first boring is blind hole.
Advantageously, first boring of described valve body has several different-diameters that successively decrease to the opposite end direction from open end, thereby thereby allows to insert some fillers and avoid these fillers damage filler when inserting that slides in hole or opening.
In a preferred embodiment, described latch can move and be provided with hold-down ring, be provided with distance member between described removable latch and described hold-down ring, described distance member is applicable to described moveable piston is remained on the position of opening interception valves.Described distance member is used when described brake circuit is full of gasoline and is removed subsequently so that allow described breakaway valve to carry out normal running.
In this embodiment, preferably, the shape of described distance member is configured such that when brake-pressure is applied on the described breakaway valve and can be discharged automatically.
The present invention further purpose of preferred embodiment is to solve another problem that exists in the vehicle in the known technology.At present, in these vehicles, the braking torque that is applied to rear wheel and be applied to front vehicle wheel and trailer (if exist) on braking torque between do not optimize balance.Therefore need avoid front vehicle wheel to block too much in advance with respect to rear wheel, this situation will make steering vehicle take place difficult or no longer can steering vehicle.For this reason, the size of front brake and triler brake is very little.But, the braking maneuver under this mode will be not can optimization, and in some cases, for example when vehicle when travel in the slope on a large scale, thereby back brake can work overloadingly can take place overheated.
Therefore, further purpose of the present invention is that disconnection valve is improved, thereby allow to be applied to the ratio optimization between the different pressures on the vehicle different braking device, thereby no longer need brake dimensions too small, and make the carrying situation that braking maneuver on the different wheel is adapted to self carrying situation and produces owing to mounting tools on vehicle that is applied to.In other words, the objective of the invention is to make disconnection valve when not carrying out opening operation, will give vehicle front brake and triler brake (if having trailer) with respect to the pressure transmission that the pressure that directly is sent to the vehicle back brake reduces in proportion.
Known that some are used for pressure is carried out the device that reduces in proportion, so that improve braking maneuver, but, the known device that can realize this purpose also is not suitable for the vehicle type of being considered, in the vehicle type of being considered, should carry out the distinctive break function that disconnects action when needed.
Therefore, the invention still further relates to a kind of valve that is used to disconnect the braking maneuver of the specified general type in front, it is characterized in that, described moveable piston comprises second axial blind hole in the face of the described first input interface channel, tubular plunger and described valve body combine hermetically and insert hermetically in described second axial blind hole of described moveable piston, described plunger limits first chamber in the bottom of described second axial blind hole, described first chamber has with described second identical cross section of boring and the passage by described tubular plunger and communicates with external pressure, described plunger limits annular compartment in described first boring of described valve body, described annular compartment communicates with the described first input interface channel, and the cross section of described annular compartment equals the poor of described first boring and described second cross section of holing; Thereby, import the ratio that the ratio of pressure and external pressure in the interface channel obtains according to the ratio and described first of the sectional area of described first boring and described second boring, the power that pressure in the described first input interface channel is applied on the described moveable piston is reduced with respect to the pressure in the first input interface channel and the product of first sectional area of holing, and according to described ratio, the pressure that described breakaway valve is sent to described transmission interface channel is reduced with respect to the pressure in the described second input interface channel.
Described external pressure can be a bar pressure, and in this case, the described ratio that obtains is constant: corresponding to the ratio of described first boring with the sectional area of second boring.
Be to be understood that, the geometry that has the breakaway valve of these features by selection, according to having considered vehicle characteristics and having carried distribution characteristics and optimized ratio, can reduce to be sent to the braking maneuver of front brake and/or trailer with respect to the braking maneuver that is sent to back brake.Yet according to this embodiment, described ratio is limited and can not be modified by the architectural feature of disconnection valve.
According to further embodiment, be provided with push rod and mechanical equivalent of light feeding device, described push rod is resisted against on the described moveable piston by the passage of described tubular plunger, thus described mechanical equivalent of light feeding device in advance insight be used for applying an adjustable force this scalable be sent to described moveable piston to described push rod.Described mechanical equivalent of light feeding device comprises spring, and described compression of spring can be regulated by control setup, and described control setup is for example for having the control wheel of screw shaft.
In this case, by under control, revising the thrust that is applied to by spring on push rod and the moveable piston, correspondingly reduced action, thereby can revise the operative condition of disconnection valve so that make disconnection valve be applicable to the particular bearer situation of needs and this vehicle of particular vehicle against the pull back spring of the moveable piston of the first pressure effect of input in the interface channel.
According to further embodiment, the external pressure that acts in described first chamber that limits in described second boring is not a bar pressure, but comes from the pressure in external adjustable pressure source.In this case,, correspondingly revise ratio as a result, reduced according to the pressure of described ratio as a result, thereby pressure is applied to the transmission interface channel from the described second input interface channel by revising external pressure numerical value.Therefore, in this embodiment, can revise the operative condition of disconnection valve so that make this disconnection valve be applicable to the particular bearer situation of needs and this vehicle of particular vehicle.
The modification of external pressure numerical value can be undertaken by manual control, perhaps can regulate by the automatic guidance of system, and described system is applicable to the control of braking that described breakaway valve carries out is assessed and be applicable to the load situation of vehicle.
Description of drawings
By following with reference to accompanying drawing to the description that some embodiment did, above-mentioned feature of the present invention and other features, objects and advantages will become clearer, these embodiment are non-limiting example.In the accompanying drawings:
Fig. 1 shows the block scheme of brake system in the known technology;
Fig. 2 shows the hydraulic circuit diagram of identical brake system;
Fig. 3 shows the section drawing that known technology breaks valve;
Fig. 4 shows the hydraulic circuit diagram of breakaway valve shown in Figure 3;
Fig. 5 shows the hydraulic circuit diagram according to breakaway valve of the present invention;
Fig. 6 shows the section drawing of first embodiment of breakaway valve according to the present invention under the inoperative condition;
Fig. 7 shows the section drawing of breakaway valve under service conditions among Fig. 6;
Fig. 8 shows according to second embodiment that is inserted with distance member in the breakaway valve of the present invention, and described distance member is used for the simplified system filling process;
Fig. 9 shows the 3rd embodiment according to breakaway valve of the present invention, and described breakaway valve comprises equalization brake gear, and described equalization brake gear does not have the device that is used to regulate operating conditions;
Figure 10 shows the 4th embodiment according to breakaway valve of the present invention, and described breakaway valve comprises equalization brake gear, and described equalization brake gear is provided with the mechanical device that is used to regulate operating conditions; And
Figure 11 shows the 5th embodiment according to breakaway valve of the present invention, described breakaway valve comprises equalization brake gear, described equalization brake gear is provided with the device that is used to regulate operating conditions, and the described device that is used to regulate operating conditions is operated by the correction of external pressure.
The specific embodiment
For the brake system type in the known technology is recalled, Fig. 1 shows the block scheme of this system, and all wheels are provided with brake equipment in this system, and Fig. 2 then shows the hydraulic diagram of this system.Vehicle has four wheel: front left wheel RAS, has the brake equipment of oneself; Right front wheel RAD has oneself brake equipment; Left back wheel RPS has oneself brake equipment; Right rear wheel RPD has oneself brake equipment.May have a trailer RI, its wheel is braked by trailer brake valve VFR.The brake equipment of all these wheels is all by two brake pedals, and promptly left-hand tread plate PS and right-hand tread plate PD control.In order to reach this purpose, left-hand tread plate PS is connected to the left side master cylinders CMS that receives gasoline from fuel tank, when operation left-hand tread plate PS, pressurized gasoline is sent to the brake equipment of left back wheel RPS and be used to disconnect front vehicle wheel and the breakaway valve VD of trailer (if existence) brake equipment.Similarly, right-hand tread plate is connected to from fuel tank S (in the present embodiment, providing the fuel tank of gasoline with master cylinders CMS to the left is same fuel tank) receive the right side master cylinders CMD of gasoline, when operation right-hand tread plate PD, pressurized gasoline is sent to the brake equipment of right rear wheel RPD and be used to disconnect front vehicle wheel and the breakaway valve VD of trailer (if existence) brake equipment.Breakaway valve VD (The present invention be more particularly directed to) has such purpose: during pedal in only operating PS and PD, disconnect the brake equipment of front vehicle wheel RAS and RDS and/or trailer RI.
When operating respectively, two pedal PS and PD only allow to brake being positioned at mutually the rear wheel of the same side with operated pedal.Operating two pedal PS and PD simultaneously then allows all wheels are braked.
For balancing brake operation under a kind of situation in the back, compensation flap VB is placed between two master cylinders CMS and the CMD, when operating two pedal PS and PD so at the same time, compensation flap VB will carry out equilibrium to the hydraulic pressure that mails to each wheel.This compensation flap VB is made up of the parts that are included among master cylinders CMS and the CMD.
(section drawing is shown in Figure 3 in a known embodiment, hydraulic diagram is shown in Figure 4), the breakaway valve VD that is used to disconnect front-wheel and trailer (if existence) brake equipment comprises the main body 1 with boring, wherein be inserted with two pistons 2 and 3, the hydraulic pressure that master cylinders CMS and CMD produce acts on respectively on described two pistons.These pressure affact on the breakaway valve VD by each input interface channel 4 and 5. Insert ball valve 6 and 7 in position 2 and 3 respectively, described ball valve is closed and can be opened by distance member 8 by spring separately usually.Distance member 8 freedom are being installed between ball valve 6 and 7, it is applicable to when two pistons 2 and 3 are close mutually and acts on the ball valve, transmits interface channel 9 so that allow from the pressure arrival of input interface channel 4 and 5 thereby open ball valve 6 and 7 (or one of them ball valve).If transmitting interface channel 9 provides front-wheel and/or has trailer then the brake equipment of trailer RI is provided by trailer brake valve VFR.When the pressure from input interface channel 4 and 5 went to zero, spring 10 promoted piston 2 and 3 and moves toward opposite sense, finally turns back to dead position.Latch 11 is closed the inlet of the boring that is inserted with piston 2 and 3.Two cleaning valves 12 and 13 communicate with input interface channel 4 and 5, and the air to valve when mounted and at every turn when being used for needing exhaust carries out emptying.
The operation of the valve in the diagram is as follows.When carrying out single shoe brake by a brake pedal among operation brake pedal PS and the PD, only there is a master cylinders that pressure is mail to the corresponding brake equipment of rear wheel RPS or RPD among two master cylinders CMS and the CMD, also pressure mail to the corresponding input interface channel 4 or 5 of breakaway valve VD.Then, corresponding piston 2 or 3 moves to another piston 3 or 2, and its ball valve 6 or 7 bears against this distance member 8 on another ball valve 7 or 6 after touching distance member 8.The piston ball valve that is applied with pressure keeps closed condition by this pressure, and another does not have the ball valve of pressure effect then to be opened by distance member, but this is opened without any influence under the situation of pressure not having.Therefore, the pressure that sends to breakaway valve VD by this way can not arrive and transmit interface channel 9, and the brake equipment of front vehicle wheel and/or trailer is not operated.Therefore, only there is a rear wheel braked in this case.
On the contrary, when when operating two brake pedal PS and PD simultaneously and carry out bi-directional braking, two master cylinders CMS and CMD send to the corresponding brake equipment of rear wheel RPS and RPD and the corresponding input interface channel 4 and 5 of breakaway valve VD with pressure.Then, two pistons 2 and 3 close mutually, at least one ball valve 6 or 7 (perhaps two ball valves) that has touched distance member 8 by this distance member against they spring and act on the effect of the pressure on the ball valve and open.Therefore, at least one pressure that sends to breakaway valve VD arrive to transmit interface channel 9, and the brake equipment of front-wheel be activated (if there is trailer RI, then the brake equipment of trailer RI is activated by trailer brake valve VFR).Therefore, all two wheels and trailer wheel (if existence) all are braked.
Can recognize that by observation when implementing according to known technology, the structure of breakaway valve VD is more complicated during fabrication, also more complicated when therefore assembling to Fig. 3.
First embodiment according to breakaway valve VD of the present invention is illustrated among Fig. 6, and its hydraulic circuit then is illustrated among Fig. 5.The contrast of the contrast of Fig. 4 and Fig. 5 and Fig. 6 and Fig. 6 demonstrates according to breakaway valve of the invention process significantly how with respect to the simplification of implementing according to known technology that corresponding breakaway valve carried out.
In first embodiment of the present invention, the breakaway valve VD that is used to disconnect the brake equipment of front vehicle wheel and/or trailer comprises main body 21, main body 21 has blind hole 38, in blind hole 38, insert two pistons 22 and 23, the hydraulic pressure that master cylinders CMS and CMD produce acts on respectively on two pistons, and the hydraulic pressure that master cylinders CMS and CMD produce enters breakaway valve by input interface channel 24 and 25 respectively.Only insert interception ball valve 26 in piston 22, interception ball valve 26 is closed by the spring 27 that is squeezed on the hold-down ring 35 usually.Interception valves 26 can be opened by the lock pin 28 of piston 23 carryings, thereby make and to arrive transmission interface channel 29 from the pressure of importing interface channel 24, described transmission interface channel 29 provides front wheel brake device and/or trailer brake valve VFR, thereby the brake equipment of trailer RI is provided.
Be noted that need in the present invention and the known system two cleaning valves different be that a cleaning valve is just enough in the present invention.
It is also noted that, by hold-down ring 34 be blocked in can not the shift position piston 22 to have one only be structural function, 27 on the ring that promptly carries bearing that a ball valve 26 acted on and ball valve 26 against ring 35.This is provided with to be beneficial to and makes and the assembling valve, and this is provided with also and can replacement be set by different other, and wherein, piston 22 can save.For example, the bearing of ball valve 26 can directly be carried by main body 21, and can provide second latch on latch 31 opposites, is used to close boring, and in the present embodiment, described boring is by entire body 21.
Now the breakaway valve operation of representing among Fig. 6 and Fig. 7 is described.When only operating a brake pedal PS or PD and carry out single shoe brake, only there is a master cylinders that pressure is sent to the corresponding brake equipment of rear wheel RPS or RPD and the corresponding input interface channel 24 or 25 of breakaway valve VD among two master cylinders CMS and the CMD.Two kinds of different situations can appear then:
If only there is brake pedal PS to be activated, then master cylinders CMD remains unactivated state, and master cylinders CMS then sends to pressure the brake equipment of corresponding rear wheel RPS and the input interface channel 25 of breakaway valve.This pressure is subjected to displacement the effect of piston 23 against spring 30.The lock pin 28 of piston 23 acts on the ball valve 26 and against the effect of spring 35 opens valve.Yet, because input interface channel 24 does not receive any pressure, not transmitting interface channel 29 so there is pressure to be sent to, the brake equipment of front vehicle wheel and/or trailer does not activate.Therefore, only there is rear wheel RPS to be braked.
If only there is brake pedal PD to be activated, then master cylinders CMS remains unactivated state, and master cylinders CMD then sends to pressure the brake equipment of corresponding rear wheel RPD and the input interface channel 24 of breakaway valve.Yet this pressure can not move the piston 23 that is blocked by hold-down ring 34.Ball valve 34 remains closed condition, do not have pressure to be sent to and transmit interface channel 29, thereby the brake equipment of front vehicle wheel and/or trailer does not activate in the present embodiment.Therefore, only there is rear wheel RPD to be braked.
If carry out bi-directional braking by operating brake pedal PS and PD simultaneously, then two master cylinders CMS and CMD send pressure to the corresponding brake equipment of rear wheel RPS and RPD and the corresponding input interface channel 24 and 25 of breakaway valve.Then, moveable piston 23 moves to fixed piston 22, and ball valve 26 is opened against the effect of pressure in spring 27 and the input interface channel 24 by the lock pin 22 of piston 23.The pressure effect that exists in the input interface channel 25 is better than the pressure effect that exists in the input interface channel 24, this is because the pressure that exists in the input interface channel 25 is applied on the part of piston 23, and piston 23 parts are more much bigger than the part of the ball valve 26 that receives the pressure effect that exists in the input interface channel 24.Thereby the formed position of each parts as shown in Figure 7.The pressure that exists in the input interface channel 24 arrives by the ball valve of opening 26 and transmits interface channel 29, and the brake equipment of front vehicle wheel and/or trailer is activated.Therefore, four wheels of all of vehicle and trailer (if existence) all are braked.
Can be as seen from Figure 6, first boring 38 is processed in the main body 21 of breakaway valve has three different-diameters that progressively diminish from the bottom that enters the mouth.In this mode, can insert from the boring inlet forming the different fillers of parts leak free (packing), slide on hole or the opening and not be used in, this has reduced the possibility of damaging filler when mounted.
Breakaway valve structure according to the present invention is compared with known structure very and simplified: the ball valve with spring and distance member is limited activity, and the structure of single moveable piston is very simple.Make and device is simplified more and cost is lower, thereby the possibility that is damaged is minimized and has obtained higher reliability.
Fig. 8 represents second embodiment according to breakaway valve of the present invention, and this embodiment improves first embodiment, thereby makes that the operation from the breakaway valve air-out is more prone to when brake circuit is full of gasoline.In order to carry out this operation, thereby gasoline is introduced applying on the brake circuit under the effect of low pressure at pressure.In this embodiment of breakaway valve, between latch 31 and hold-down ring 36, add a plastics distance member 37, thereby distance member 37 remains on latch 31 on the anterior locations and will also remain on against the moveable piston 23 of latch 31 on the anterior locations.Then, the lock pin 28 of moveable piston 23 remains on ball valve 26 on the open position enduringly.As a result of, be connected to the front vehicle wheel brake circuit and/or the trailer brake valve (if existence) that transmit interface channel 29 and communicate with input interface channel 24 enduringly, thereby communicate with master cylinders CMD.In these cases, be applied to the low pressure on the parts that communicate with the rear wheel brake circuit, for example be applied to the low pressure on the fuel tank S, be sent on the whole loop that comprises front vehicle wheel brake circuit and trailer brake valve.
On the contrary, in the brake circuit in known technology, low pressure that breakaway valve is normally closed and that do not allow to be applied on rear wheel brake circuit or the fuel tank is sent on the front vehicle wheel brake circuit.As a result of, introduce before the gasoline under pressure, low pressure need be applied on two differences of brake circuit, one of them point communicates with the rear wheel brake circuit, and another point communicates with the front vehicle wheel brake circuit.Therefore, comprise that brake circuit necessary operations according to the breakaway valve of known technology is basically than comprising that the brake circuit necessary operations according to breakaway valve of the present invention is complicated more.
What can mention is, makes the padding of system become to be easy to distance member also can be added in the known breakaway valve.
When gasoline is filled by system, can remove spacer ring 37, so that carry out the normal running of breakaway valve.Advantageously, the shape of spacer ring 37 for example has inclined outer surface shown in Figure 8, discharges thereby make it automatically to be disconnected the pressure that produces in the valve during brake operating in the first time.
According to the 3rd embodiment, as shown in Figure 9, moveable piston 23 has second blind hole 39, and its inlet and first is imported interface channel 25 and faced mutually, and is inserted into hermetically in described second blind hole 39 of moveable piston 23 with tubular plunger 40 that the main body 21 of breakaway valve is combined closely.According to embodiment shown in the figure, tubular plunger 40 is combined closely with the latch 31 of closing first boring 38.Tubular plunger 40 limits first chamber 41 in the bottom of second blind hole 39, the cross section of described first chamber 41 is identical with the cross section of described second blind hole 39.First chamber 41 communicates with external pressure P0 by the passage of described tubular plunger 40.In addition, in described first boring 38 of main body 21, tubular plunger 40 limits second chamber, 42, the second chambers 42 and communicates for annular and with the described first input interface channel 25 between moveable piston 23 and latch 31.The section S 3 of annular chamber 42 equals section S 2 poor of first boring 38 the section S 1 and second boring 39.
Under the bi-directional braking situation, master cylinders CMS and CMD send to input interface channel 24 and 25 with pressure, owing to there is the valve of balance in system, the equalization of pressure that mails to two input interface channels is in numerical value P1.Under the situation that does not have current embodiment of the present invention, be applied to power F1 on the moveable piston by existing pressure P 1 in the input interface channel 24 and 25 and equal the hole product of 38 section S 1 of pressure P 1 and first.On the contrary, owing to there is the structure of the current embodiment of the present invention, the ratio R that obtains according to ratio from the section S 2 of described first boring 38 section S 1 and described second boring 39, and according to pressure P 1 in the input interface channel 24 and 25 and the ratio between the external pressure P0, the power F that is applied on the moveable piston 23 is reduced with respect to described power F1.On moveable piston 23 residing positions, described power F carries out balance by power and power F3 sum that pull back spring 30 applies, and described power F3 is by the section S 1 that transmits pressure P 3 and described first boring 38 in the interface channel 29 acquisition of multiplying each other.Moveable piston 23 is only opened interception valves 26 during greater than power F3 at described power F.Therefore, according to described ratio R as a result, the pressure P 3 that breakaway valve VD reaches described transmission interface channel 29 is adjusted on the numerical value, and this numerical value is lowered with respect to the pressure P 1 in the described second input interface channel 24.Therefore, this ratio R is the regulation rates of breakaway valve VD.
As previously mentioned, the breakaway valve according to Fig. 9 has constant regulation rates R.By the construction parameter of abundant selection breakaway valve, be in particular the surperficial S1 of first boring 38 and the surperficial S2 of second boring, this regulation rates can be regulated according to certain vehicle type and carrying situation normally thereof.Because first chamber 41 communicates with air, so pressure P 0 wherein is constant.
Referring now to the 4th embodiment of the present invention, as shown in figure 10, the parts of describing with reference to Fig. 9 remain unchanged, and different is that by tubular plunger 30 introducing push rods 43, described push rod 43 is resisted against on the described moveable piston 23.Apply an adjustable force by a mechanical equivalent of light feeding device that comprises spring 44 to this push rod.The compression of spring 44 can be controlled wheel 45 and regulate, and the axle 46 of described control wheel 45 is screwed in the support component 47, and described support component 47 constitutes one with the main body 21 of breakaway valve.Just an adjustable force may be applied on the piston 23 by this device, the power that described adjustable force applies pull back spring 30 is carried out the part compensation.In this mode, can make amendment to the operating conditions of breakaway valve VD, particularly the operating conditions of its intervention point is made amendment, thereby make breakaway valve VD can be adapted to the specific locomotive machine type and the actual bearer situation of this vehicle.
Be to be understood that, described mechanical equivalent of light feeding device only is an example, this device can be designed as various multi-form, allow the operating conditions of breakaway valve is regulated continuously, allow progressively to regulate, promptly select in two or more operating conditionss of preestablishing, the described operating conditions of preestablishing for example can be corresponding to the vehicle condition after the unloading, the big condition of condition and bearing capacity of freighting normally.
The 5th embodiment of the present invention as shown in figure 11.In this embodiment, the parts of describing with reference to Fig. 9 remain unchanged, the passage that different is passes tubular plunger 40 has and connects 48, and described connection 48 is used for the pressure P 4 from external pressure source is sent to first chamber 41, described external pressure source be connected 48 and be connected.In this embodiment, the ratio R V that obtains according to ratio from the section S 2 of described first boring 38 section S 1 and described second boring 39, and according to the ratio between the pressure P 1 in the described input interface channel 25 and the adjustable external pressure P4, the power F that is applied on the moveable piston 23 is reduced with respect to foregoing power F1, thereby according to the described V of ratio R as a result, the pressure P 3 that breakaway valve VD is sent to described transmission interface channel 29 is also reduced with respect to the pressure P 1 in the described second input interface channel 24.
In this embodiment, by revising the numerical value of external adjustable pressure P4, thereby correspondingly revised for the variable V of ratio R as a result in the present embodiment,, be reduced so that be applied to from the pressure P 1 of the second input interface channel 24 and transmit interface channel 29 according to this ratio R V as a result.Therefore, in this embodiment, can also make amendment, particularly its regulation rates RV be made amendment, thereby make this breakaway valve be applicable to the particular bearer situation of specific vehicle type or vehicle the operating conditions of breakaway valve VD.
The modification that should be appreciated that external pressure numerical value P4 can be achieved by manual control.Yet advantageously, this modification is carried out automatically by control system, and described control system is applicable to the load situation of assessment vehicle and is applicable to the control of braking that is undertaken by breakaway valve.
Certainly, be used to revise the said apparatus of breakaway valve VD service conditions, promptly, also can use together according to the mechanical device of Figure 10 and according to the liquid device of Figure 11.
Should be appreciated that the embodiment that the present invention is not limited only to describe by way of example.Mentioned several possible variation embodiments in the process of describing, other variation embodiment also falls into those skilled in the art's ability.These variation embodiments and other variation embodiment and any replacement embodiment of realizing by the technical equivalents means all can be used for the present invention, and the scope of patent protection that can not deviate from spirit of the present invention and limit by appended claims.
Claims (16)
1. breakaway valve, be used for disconnecting under specific circumstances the brake equipment of front vehicle wheel, and/or when connecting by trailer brake valve, the brake system of trailer disconnects the brake equipment of described trailer, described breakaway valve is used to comprise two pairs of vehicle braked systems that are provided with the wheel of brake equipment, perhaps be used to comprise the wheel that at least one pair of is provided with brake equipment and the vehicle braked system of trailer brake valve, described brake system comprises two master cylinderses as pump, each master cylinders is operated by brake pedal independently, the brake equipment of a rear wheel of described each master cylinders direct control, brake equipment by breakaway valve control front vehicle wheel and/or at the brake equipment that has the described trailer of control under the situation of trailer, described breakaway valve disconnects the brake equipment of front vehicle wheel and/or described trailer under the situation of only operating a brake pedal, described breakaway valve comprises main body, be connected to the first input interface channel (25) and the second input interface channel (24) of described two master cylinderses, and be connected to the brake circuit of front vehicle wheel and/or the transmission interface channel (29) of trailer brake valve, it is characterized in that:
-described main body (21) has first boring (38), in described first boring (38) moveable piston (23) is installed, and described moveable piston (23) is subjected to being applied to the effect of the pressure in the described first input interface channel (25);
-described main body (21) comprises normally closed interception valves (26), and described interception valves (26) is closed the connection between described second input interface channel (24) and the described transmission interface channel (29);
-described moveable piston (23) has parts (28), described parts (28) are applicable to operation described interception valves (26) so that be subjected to being applied to the effect of the pressure in the described first input interface channel (25) and open described interception valves (26) when being moved in described moveable piston (23), allow subsequently to be communicated with between described second input interface channel (24) and the described transmission interface channel (29), thereby the pressure that allows to exist in the described second input interface channel (24) is applied in the described transmission interface channel (29).
2. breakaway valve according to claim 1, it is characterized in that, described interception valves (26) is installed along the moving direction of described moveable piston (23), described moveable piston (23) comprises lock pin (28), and described lock pin (28) acts directly on and is used to open described interception valves (26) on the described interception valves (26).
3. breakaway valve according to claim 1, it is characterized in that, described breakaway valve comprises second piston (22) of first boring in (38) that is inserted in described main body, and described second piston (22) is fixed by holding member and is used to support described interception valves (26).
4. breakaway valve according to claim 1 is characterized in that, described interception valves (26) is the ball valve that is provided with spring (27), and described spring advances interception valves (26) to off position.
5. breakaway valve according to claim 1, it is characterized in that, described first boring (38) of described main body (21) is closed by latch (31) endways, the described moveable piston (23) that is in off-position is resisted against on the described latch (31), and described moveable piston (23) is advanced to described latch (31) direction by spring (30).
6. breakaway valve according to claim 5 is characterized in that, described first boring (38) of main body (21) has the several different-diameters that successively decrease to the opposite end direction from open end.
7. breakaway valve according to claim 5, it is characterized in that, described latch (31) can move and be provided with hold-down ring (36), between described removable latch (31) and described hold-down ring (36), be provided with distance member (37), described distance member (37) is applicable to described moveable piston (23) is remained on the position of opening interception valves (26) that described distance member (37) is used and is removed subsequently so that allow described breakaway valve to carry out normal running when described brake circuit is full of gasoline.
8. breakaway valve according to claim 7 is characterized in that, the shape of described distance member (37) is configured such that when brake-pressure is applied on the described breakaway valve and can be discharged automatically.
9. breakaway valve according to claim 1 is characterized in that:
-described moveable piston (23) comprises second boring (39) in the face of the described first input interface channel (25),
-tubular plunger (40) combines hermetically with described main body (21) and inserts hermetically in described second boring (39) of described moveable piston (23),
-described plunger (40) limits first chamber (41) in the bottom of described second boring (39), and described first chamber (41) has with described second identical cross section of boring (39) and the passage by described tubular plunger (40) and communicates with external pressure,
-described plunger (40) limits annular compartment (42) in described first boring (38) of described main body (21), described annular compartment (42) and the described first input interface channel (25) communicate, and the cross section of described annular compartment (42) equals hole cross section poor of (39) of described first boring (38) and described second;
Thereby, the ratio that obtains according to ratio from the ratio of described first boring (38) and the sectional area of described second boring (39) and the pressure from described first input interface channel (25) and external pressure, the power that is applied on the described moveable piston (23) by the pressure in the described first input interface channel is reduced with respect to product, described product is multiplied each other by the pressure in the described first input interface channel (25) and described first sectional area of holing (38) and obtains, and according to the described ratio that obtains, the pressure that described breakaway valve is sent to described transmission interface channel (29) is reduced with respect to the pressure in the described second input interface channel (24).
10. breakaway valve according to claim 9, it is characterized in that, push rod (43) by described tubular plunger (40) passage and be resisted against on the described moveable piston (23), mechanical equivalent of light feeding device (44-47) in advance insight be used for to described push rod (43) thus applying an adjustable power is used for this adjustable power is sent to described moveable piston (23).
11. breakaway valve according to claim 10 is characterized in that, described mechanical equivalent of light feeding device (44-47) comprises spring (44), and the compression of described spring (44) can be regulated by control setup.
12. breakaway valve according to claim 11 is characterized in that, described control setup is for having the control wheel (45) of screw shaft (46).
13. breakaway valve according to claim 9, it is characterized in that, the source of the external pressure of effect is a bar pressure in being limited to described first chamber (41) of described second boring in (39), thereby the described ratio that obtains is constant and corresponding to the ratio of described first boring (38) with the sectional area of described second boring (39).
14. breakaway valve according to claim 9, it is characterized in that, the source of the external pressure of effect is the adjustable pressure source in described first chamber (41) in being limited to described second boring (39), thereby the described ratio that obtains is variable and is suitable for particular vehicle type and load situation thereof.
15. breakaway valve according to claim 14 is characterized in that, the numerical value of described external pressure is regulated by manual control.
16. breakaway valve according to claim 14, it is characterized in that, the numerical value of described external pressure is regulated by the automatic guidance of system, and described system is applicable to the control of braking that described breakaway valve carries out is assessed and be applicable to the load situation of vehicle.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITTO20060353 ITTO20060353A1 (en) | 2006-05-16 | 2006-05-16 | VALVE DISCONNECTING THE FRONT BRAKE AND THE TRAILER, FOR AN AGRICULTURAL TRACTOR OR SIMILRE VEHICLE |
| ITTO2006A000353 | 2006-05-16 | ||
| IT000068A ITTO20070068A1 (en) | 2007-01-31 | 2007-01-31 | VALVE DISCONNECTING THE FRONT BRAKE AND / OR TRAILER, FOR AN AGRICULTURAL TRACTOR OR SIMILAR VEHICLE |
| ITTO2007A000068 | 2007-01-31 | ||
| PCT/EP2007/004267 WO2007131758A1 (en) | 2006-05-16 | 2007-05-10 | A valve for disconnecting the front braking and/or the trailer braking, for a farm tractor or a similar vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101410282A CN101410282A (en) | 2009-04-15 |
| CN101410282B true CN101410282B (en) | 2011-10-05 |
Family
ID=40258700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007800115573A Expired - Fee Related CN101410282B (en) | 2006-05-16 | 2007-05-10 | A valve for disconnecting the front braking and/or the trailer braking, for a farm tractor or a similar vehicle |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101410282B (en) |
| IT (1) | ITTO20060353A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3640067A (en) * | 1969-05-08 | 1972-02-08 | Girling Ltd | Two-pedal hydraulic braking system |
| GB2140111A (en) * | 1983-05-21 | 1984-11-21 | Lucas Ind Plc | Tractor and trailer hydraulic braking system for facilitating steering |
| DE3615045A1 (en) * | 1986-05-03 | 1987-11-05 | Kugelfischer G Schaefer & Co | Method for compensating the different volume capacity of the wheel cylinders in a multi-circuit steering brake system and a control valve for carrying out the method |
-
2006
- 2006-05-16 IT ITTO20060353 patent/ITTO20060353A1/en unknown
-
2007
- 2007-05-10 CN CN2007800115573A patent/CN101410282B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3640067A (en) * | 1969-05-08 | 1972-02-08 | Girling Ltd | Two-pedal hydraulic braking system |
| GB2140111A (en) * | 1983-05-21 | 1984-11-21 | Lucas Ind Plc | Tractor and trailer hydraulic braking system for facilitating steering |
| DE3615045A1 (en) * | 1986-05-03 | 1987-11-05 | Kugelfischer G Schaefer & Co | Method for compensating the different volume capacity of the wheel cylinders in a multi-circuit steering brake system and a control valve for carrying out the method |
Also Published As
| Publication number | Publication date |
|---|---|
| ITTO20060353A1 (en) | 2007-11-17 |
| CN101410282A (en) | 2009-04-15 |
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