CN102310849A - Normally-closed brake assist braking system - Google Patents
Normally-closed brake assist braking system Download PDFInfo
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- CN102310849A CN102310849A CN2010102166662A CN201010216666A CN102310849A CN 102310849 A CN102310849 A CN 102310849A CN 2010102166662 A CN2010102166662 A CN 2010102166662A CN 201010216666 A CN201010216666 A CN 201010216666A CN 102310849 A CN102310849 A CN 102310849A
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Abstract
The invention relates to the technical field of engineering machinery, in particular to a normally-closed brake assist braking system, which is characterized in that a piston which is ejected by elastic force and is connected with a rocker is arranged at the braking direction of the rocker, and is arranged in an oil cylinder, the oil cylinder in which the direction of the piston is opposite to the direction of the elastic force is communicated with the oilway of a braking system through an electromagnetic directional valve, so that when the oil cylinder has no oil, the rocker is ejected by the elastic force to rotate and tension a braking belt to brake, when the oil cylinder has oil, the piston is ejected to be open to release the rocker so that a brake can normally work. The invention has the advantages that the problems that when a machine carries out operation in a slope, an engine suddenly fires off, or a driver closes a key switch, so that sliding and other dangerous phenomena can be caused can be solved, the brake force is large, the brake stroke and the brake time are short, and the brake can be quickly realized; some elements of the braking system of a chassis are utilized, so the cost is low; and the whole assembly is realized, the assembly, the disassembly, the adjustment and the maintenance are convenient, the function of the original braking system can not be influenced after the assembly, and the operation habits of the driver can not be influenced. The normally-closed brake assist braking system disclosed by the invention has very high application value.
Description
Technical field
The present invention relates to technical field of engineering machinery, especially a kind of aid parking brake system that is used for construction machinery and equipment pipe sling, bulldozer.
Background technology
The braking system with hydraulic assisting force 26S Proteasome Structure and Function implementation procedure of pipe sling employing at present (is seen accompanying drawing 1) as follows:
Under the normal entry condition of driving engine; Brake activation handle brake activation valve is opened and is made pressure oil be full of oil pocket 5 (perhaps stepping on down brake pedal); Piston 4 is ejected; Promote rocking arm 3 and move along arrow a direction, drivening rod 2 moves along arrow b direction, thereby drivening rod mechanism 1 moves the brake collar two ends and hold the power-transfer clutch outer wheel hub tightly the realization car brakeing along c, d direction respectively.The brake system of this structure will make brake collar not loosening, even under the engine off state, the pressure oil in the valve body 6 all must must not be lower than certain force value.But; The leakage of whole hydraulic efficiency pressure system is inevitable; The force value that can't guarantee long-time inner valve body 6 does not reduce; Machine in the ramp during operation flame-out suddenly back of driving engine or chaufeur close key switch and can slip dangerous phenomenons such as slope, thereby influence the homework precision of Operation Van, people, machine and ambient environment are caused potential safety hazard.
Summary of the invention
The object of the invention just provides and a kind ofly can solve engineering truck to existing employing braking system with hydraulic assisting force in the operation process of ramp, and the flame-out suddenly or chaufeur of driving engine is closed key switch then can slip the normally closed braking assist brake system of problems such as dangerous phenomenon such as slope.
Solution of the present invention is such: the rocking arm, the end that the present invention includes Hydraulic Pump, check valve, solenoid directional control valve, timing throttle valve, brake cylinder, brake cylinder drive rotation pass through connecting rod mechanism and rocking arm bonded assembly brake collar; The braking direction of said rocking arm is provided with auxiliary device; Said auxiliary device comprises single-acting cylinder, elastomeric element; The end of said oil cylinder piston bar is connected with the rocking arm contact; Said elastomeric element is arranged between cylinder block and piston rod or the piston, and it is identical that the direction that said elastomeric element discharges elastic force and piston rod stretch out direction, said piston rod to stretch out direction identical with the rocking arm braking direction; Said oil cylinder oil-feed piston retraction direction is opposite with elastomeric element elastic force release direction; Said oil cylinder is to be communicated with the oil circuit of brake system, rotates the braking of tension brake collar thereby push rocking arm by elastic force when being formed in the oil cylinder oil-break, when the logical oil of oil cylinder, backs down the structure that the piston release rocking arm makes the drg normal operation.
If in brake system, adopt the normal open oil circuit of inserted valve to be connected, just can realize directly coming the brake mode of control brake system braking with inserted valve with the oil circuit of oil cylinder.
Advantage of the present invention is:
1. adopt that performance is stable, thereby the failure-free spring force replaces hydraulic coupling that force value can't stable for extended periods of time to promote rocking arm drivening rod mechanism brake collar being held tightly, made vehicle braking performances more reliable.
2, the invention belongs to normally closed closing; The fluid power piece-rate system; When the flame-out rear electromagnetic valve outage of machine, in-oil cylinder spring ejects the promotion rocking arm with piston rod and rotates around hinge, drives stop mechanism and holds brake collar tightly rapid braking; Close key switch because of stop working suddenly back or chaufeur in the time of can effectively preventing the car ramp operation dangerous phenomenons such as slide slope take place, thereby effectively guarantee the operation quality of vehicle and the safety of man-machine and peripheral extent;
3. under the situation of do not walk at machine, driving engine not stopping working the wait operation,, also this system is braked rapidly, realize and need not as traditional chassis, slam brake pedal constantly by chaufeur through the gauge panel parking brake switch;
4. the present invention has used the subelement of chassis brake system, and cost is low, and can realize integral installation; So installation, dismounting, adjusting, easy to maintenance; Do not influence the function of former brake system after the installation, do not influence the operating habit of chaufeur, therefore have very high using value.
Description of drawings
Accompanying drawing is embodiments of the invention.
Accompanying drawing 1 is the structural representation of original chassis drg.
Accompanying drawing 2 is structural representations of the embodiment of the invention one.
Accompanying drawing 3 is structural representations of the embodiment of the invention two.
The specific embodiment
In the embodiments of the invention, the 1st, brake connecting rod mechanism, the 2nd, connecting rod, the 3rd, loam cake, the 4th, former rocking arm, the 5th, piston; The 6th, valve body, the 7th, brake collar, the 8th, pilot bar, the 9th, guide rod jam nut, the 10th, end cap, the 11st, elastomeric element; The 12nd, end cap jam nut, the 13rd, guide ring, the 14th, seal ring, the 15th, piston rod, the 16th, oil cylinder, the 17th, seal ring; The 18th, guide ring, the 19th, cover plate, the 20th, roller, the 21st, base, the 22nd, rocking arm; The 23rd, timing throttle valve, the 24th, solenoid directional control valve, the 25th, check valve, the 26th, hydraulic system of chassis, the 27th, jaw.
Present embodiment comprises that Hydraulic Pump, check valve 25, solenoid directional control valve 24, timing throttle valve 23, brake cylinder 16, brake cylinder 16 drive the rocking arm 23, the end that rotate and pass through connecting rod mechanism and rocking arm 22 bonded assembly brake collars 7; The braking direction of said rocking arm 22 is provided with auxiliary device; Said auxiliary device comprises brake cylinder, the elastomeric element of unidirectional action; The end of said oil cylinder piston bar 15 is connected with rocking arm 22 contacts; Said elastomeric element 11 is arranged between cylinder block and piston rod or the piston, and it is identical that the direction that said elastomeric element discharges elastic force and piston rod 15 stretch out direction, said piston rod 15 to stretch out direction identical with rocking arm 22 braking directions; Said oil cylinder oil-feed piston retraction direction is opposite with elastomeric element elastic force release direction, and said oil cylinder is to be communicated with the oil circuit of brake system.
Said elastomeric element 11 is a coil spring, is arranged on oil cylinder inside, and the one of which end is connected with piston 5, and the other end is connected with cylinder base.In the present embodiment, elastomeric element 11 is arranged on the head of oil cylinder, and the one of which end is connected with the end of piston rod, and the other end is connected with cylinder cover.
In the oil circuit of said brake system; The oil cylinder oil-feed is provided with check valve in the loop; Add check valve, effect: normally closed braking assist brake system hydraulic oil is taken from hydraulic system of chassis, for prevent hydraulic system of chassis operation moment cause normally closed braking assist brake system pressure instantaneous reduce to minimum; Piston 15 can be ejected by elastomeric element 11 and promote rocking arm and rotate brake collar is held tightly, causes that vehicle in going pauses to stop.Employing check valve 25 guarantees that the oil pressure in brake cylinder 16 pressure chambers is stable, thus the compatibility of realization and braking in a turn system.The oil cylinder oil return is provided with the timing throttle valve in the loop, prevents that the oil cylinder oil return is too fast, reduces and impacts, and realizes gradual braking.
In the present embodiment:
The control circuit of the electromagnetic valve in the oil circuit of said brake system is to receive car load general supply electric lock; When rotating to " ON " end car load, electric lock gets when electric; And the brake switch that is located at the gauge panel position is in " ON " (or " OFF ") position, and electromagnetic valve gets electric opening, and normally closed braking assist brake system sets up oil pressure through electric lock normal start the engine success back; The piston masthead is returned, and complete machine can walk, turn to, brake under the effect of braking in a turn hydraulic efficiency pressure system.Behind the engine off, work the automatically locking brake of electromagnetic valve dead electricity, assist brake system.After the normal startup of driving engine, be provided with brake switch in the gauge panel position, flame-out at driving engine; Machine is not walked or is waited under the situation of operation; Brake switch is pushed " OFF " (or " ON ") position, can realize cutting off or closed electromagnetic valve power supply, realize parking brake function.
Said elastomeric element is a coil spring, and described coil spring is to be enclosed within outside the pilot bar.
Described pilot bar is a band outside thread pilot bar, is used for control plunger at in-oil cylinder stroke, prevents to damage or spring force causes piston rod to be pushed back cylinder cavity inadequately because of spring.
Electromagnetic valve is rack-mount, and the installation site of support is selected on the rear axle box cover plate.
In the present embodiment; Brake cylinder 16 drives the rocking arm 22 that rotates under the effect of pressure oil; rocking arm 22 is connected with an end of brake collar 7 through connecting rod mechanism 1; be provided with by elastic force at the braking direction of said rocking arm 22 and eject and rocking arm 22 contacted piston rods 15, and said piston rod 15 is mounted in the brake cylinder 16, is being communicated with the oil circuit of hydraulic system of chassis through solenoid directional control valve 24 with the rightabout oil cylinder of elastic force chamber.
Described piston rod 15 1 ends are connected with spring 11, and described elastic force is the elastic force of elastomeric element 11, and an end of elastomeric element 11 withstands piston rod 15, and the other end withstands on the cylinder cover 10.
In the present embodiment; The rear end of brake cylinder 16 is with end cap 10 sealing, on brake cylinder 16, is equipped with through guide rod jam nut 9 and passes end cap 10 and stretch into the pilot bar 8 in the oil cylinder 16, and elastomeric element 11 is sleeved on the pilot bar 8; The one of which end withstands on the end cap 10; The other end withstands on the piston rod 15 that is installed in oil cylinder 16 inner chambers, and piston rod 15 1 ends are connected with piston, and the other end stretches to the swinging end that the rocking arm 22 outside the brake cylinder 16 is installed.Rocking arm 22 is rack-mounted through hinge, and it is connected with the brake connecting rod mechanism 12 of machine, and brake connecting rod mechanism 1 is connected with brake collar 7.Controlling by a solenoid directional control valve 24 of brake cylinder 16 into and out of oil, solenoid directional control valve 24 is connected with the driving engine of machine, and whether electric it get by the control of gauge panel brake switch.On the delivery line of brake cylinder 16, also be provided with check valve 25 and flow regulating valve 23, shown in accompanying drawing 2.
The present invention is when installing and using; As long as engine off or startup gauge panel brake switch, the spring 11 in the brake cylinder will be released piston rod 15, and the top of piston rod 15 pushes the top of rocking arm 22; Rocking arm 22 is rotated around hinge; Thereby drive connected brake connecting rod mechanism 1 and hold brake collar tightly braking,, prevent that effectively machine from slipping dangerous phenomenons such as slope when machine operation or can both brake rapidly when starting the gauge panel brake switch in the ramp.When solenoid directional control valve 24 when electric, solenoid directional control valve 24 is communicated with the delivery line of brake cylinder 16, is full of pressure oil in the brake cylinder 16 piston rod 15 is promoted backward, makes the top disconnection of itself and rocking arm 22, thereby does not influence the work of hydraulic system of chassis.
Of the present invention with the oily hydraulic oil of taking from hydraulic system of chassis, after installation, do not influence the function of the original brake system of machine, do not influence the operating habit of chaufeur.
The predetermincd tension of the elastomeric element 11 of brake cylinder 16 of the present invention can be according to the adjustment of machine brake needs, and its dismounting maintenance is all very convenient.
Technical scheme two (seeing accompanying drawing 3): under the situation that does not change former Rocker arm 4, change and rocking arm bonded assembly jaw 27 shapes, as the supporting seat of roller.Principle of work is identical with former scheme, only becomes jaw with roller bonded assembly parts by rocking arm.
The principle of work of normally closed braking assist brake system:
Work as engine off, solenoid directional control valve 24 promptly cuts off the power supply, and the right position of this valve is connected; The pressure oil and the fuel tank that are oil pocket E are connected; Hydraulic fluid pressure is zero, and 15 in piston is ejected under the resilient force of parts 11, and the roller 20 on making its end C and being installed in rocking arm 22 contacts; Then promoting rocking arm 22 clockwise rotates around fulcrum O; Thereby drivening rod 2 (accompanying drawing 1) moves along arrow b direction, makes brake collar 7 move by accompanying drawing one arrow c, d direction through connecting rod mechanism 1 (accompanying drawing 1), holds the power-transfer clutch outer wheel hub tightly.
Work as engine starting, solenoid directional control valve 24 promptly gets electric, and position, this valve left side is connected, and pressure oil is full of oil pocket E, and piston 15 is pushed up back along arrow e direction, and piston rod end C separates with rocking arm 22, and whole assist brake system no longer interferes the operations such as cruising of vehicle.
The adjustment of initial tension of spring
1. adjust guide rod 8: when initially installing end cap 10 is screwed in 30mm left and right sides compression springs and guarantee predetermincd tension (because of the different screw-in lengths of car load model also difference).Pressure oil input oil cylinder oil pocket E with oil pressure
; Adjustment guide rod 8 screw-in lengths make piston rod 15 extension elongation
satisfies
, screw in jam nut 9 then with guide rod 8 lockings.Oil cylinder and pipeline system are installed.
2. start the engine test run is parked in (according to the different slopes of using different angles of operating mode) on about 30 degree slopes with vehicle, and car load cuts off the power supply or presses the stopping brake button and cut off power of electromagnetic valve; Spring force ejects piston rod, and piston rod pushes rocking arm, and drivening rod mechanism holds brake collar tightly; As do not have and slip sloping phenomenon and then need not adjustment; Explain then that if any the sloping phenomenon of slide spring pressure is not enough, need to continue to screw in end cap 10 and the further compression spring of adjustment guide rod, the ejecting force of increase piston rod.Do not slip the slope until vehicle, tighten nut 9,12 then respectively.
Claims (10)
1. normally closed braking assist brake system; Comprise that Hydraulic Pump, check valve, solenoid directional control valve, timing throttle valve, brake cylinder, brake cylinder drive the rocking arm, the end that rotate and pass through connecting rod mechanism and rocking arm bonded assembly brake collar; It is characterized in that: the braking direction of said rocking arm is provided with auxiliary device; Said auxiliary device comprises brake cylinder, the elastomeric element of unidirectional action, and the end of said oil cylinder piston bar is connected with the rocking arm contact, and said elastomeric element is arranged between cylinder block and piston rod or the piston; It is identical that the direction that said elastomeric element discharges elastic force and piston rod stretch out direction; Said piston rod to stretch out direction identical with the rocking arm braking direction, said oil cylinder oil-feed piston retraction direction is opposite with elastomeric element elastic force release direction, said oil cylinder is to be communicated with the oil circuit of brake system.
2. normally closed braking assist brake according to claim 1 system, it is characterized in that: said elastomeric element is a coil spring, is arranged on oil cylinder inside, and the one of which end is connected with piston, and the other end is connected with cylinder base.
3. normally closed braking assist brake according to claim 1 and 2 system, it is characterized in that: said elastomeric element is a coil spring, is arranged on the head of oil cylinder, and the one of which end is connected with the end of piston rod, and the other end is connected with cylinder cover.
4. normally closed braking assist brake according to claim 1 system, it is characterized in that: in the oil circuit of said brake system, the oil cylinder oil-feed is provided with check valve in the loop.
5. normally closed braking assist brake according to claim 1 system, it is characterized in that: in the oil circuit of said brake system, the oil cylinder oil return is provided with the timing throttle valve in the loop.
6. normally closed braking assist brake according to claim 1 system, it is characterized in that: oil cylinder and base weld together constitute an integral body.
7. normally closed braking assist brake according to claim 6 system is characterized in that: internal leakage return opening and oil cylinder return opening be arranged on said base side or the back side or above.
8. normally closed braking assist brake according to claim 1 system, it is characterized in that: the control circuit of the electromagnetic valve in the oil circuit of said brake system is to receive car load general supply electric lock.
9. normally closed braking assist brake according to claim 1 and 2 system, it is characterized in that: said elastomeric element is a coil spring, and described coil spring is to be enclosed within outside the pilot bar.
10. normally closed braking assist brake according to claim 9 system, it is characterized in that: described pilot bar is a band outside thread pilot bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102166662A CN102310849A (en) | 2010-07-05 | 2010-07-05 | Normally-closed brake assist braking system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102166662A CN102310849A (en) | 2010-07-05 | 2010-07-05 | Normally-closed brake assist braking system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102310849A true CN102310849A (en) | 2012-01-11 |
Family
ID=45424511
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102166662A Pending CN102310849A (en) | 2010-07-05 | 2010-07-05 | Normally-closed brake assist braking system |
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| Country | Link |
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| CN (1) | CN102310849A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103144622A (en) * | 2013-03-23 | 2013-06-12 | 牛国亮 | Automobile hydraulic braking device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01143453U (en) * | 1988-03-28 | 1989-10-02 | ||
| JPH04271946A (en) * | 1991-02-28 | 1992-09-28 | Shimadzu Corp | Traction control device |
| CN201264604Y (en) * | 2008-07-16 | 2009-07-01 | 廊坊市管道人机械设备有限公司 | Normally closed braking operation apparatus |
| CN201276390Y (en) * | 2008-10-08 | 2009-07-22 | 泰安泰山工程机械股份有限公司 | Parking apparatus of pipe hoist |
| CN101565039A (en) * | 2009-06-03 | 2009-10-28 | 山推工程机械股份有限公司 | Normally closed braking mechanism for crawler type traveling machine |
-
2010
- 2010-07-05 CN CN2010102166662A patent/CN102310849A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01143453U (en) * | 1988-03-28 | 1989-10-02 | ||
| JPH04271946A (en) * | 1991-02-28 | 1992-09-28 | Shimadzu Corp | Traction control device |
| CN201264604Y (en) * | 2008-07-16 | 2009-07-01 | 廊坊市管道人机械设备有限公司 | Normally closed braking operation apparatus |
| CN201276390Y (en) * | 2008-10-08 | 2009-07-22 | 泰安泰山工程机械股份有限公司 | Parking apparatus of pipe hoist |
| CN101565039A (en) * | 2009-06-03 | 2009-10-28 | 山推工程机械股份有限公司 | Normally closed braking mechanism for crawler type traveling machine |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103144622A (en) * | 2013-03-23 | 2013-06-12 | 牛国亮 | Automobile hydraulic braking device |
| CN103144622B (en) * | 2013-03-23 | 2015-12-23 | 牛国亮 | A kind of hydraulic vehicle brake system |
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Application publication date: 20120111 |