CN2193844Y

CN2193844Y - Plunger car retarder

Info

Publication number: CN2193844Y
Application number: CN 93224539
Authority: CN
Inventors: 杨恩久; 张仲木
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-09-20
Filing date: 1993-09-20
Publication date: 1995-04-05
Anticipated expiration: 2003-09-20

Abstract

The utility model relates to a plunger type flat valve car retarder, which is characterized in that the retarder forms a closed hydraulic system by a plunger, a housing, a judging speed brake valve, a separator piston and a reset spring. The judging speed brake valve is installed at the lower end of the plunger. A pressure valve adopts the flat valve. When the car wheels roll the plunger to glide down, the oil fluid in the inner cavity of the housing enters into the inner cavity of the plunger through the judging speed brake valve. The separator piston is impelled to ascend. When the speed of the car is higher than the critical speed, the retarder makes the braking work towards the car. When the speed of the car is lower than the critical speed, the retarder doesn't make the braking work towards the car. The retarder of the utility model has simple structure, big braking work, reliable working and lower cost and manufacturing accuracy.

Description

Plunger car retarder

The utility model relates to rolling stock deceleration top collar territory.

The car retardation top is a kind of speed-regulating tool that uses at yard, being used for braking of yard purpose and afterbody stops, be installed in the inboard or the outside of circuit rail, contact with wheel tread or wheel rim by plunger mushroom head, the vehicle that is higher than critical speed is imposed counter-force play brake action, vehicle to subcritical speed is not executed counter-force, does not play brake action.

The car retardation top of generally using both at home and abroad at present, all belong to piston cylinder operator, the structure of speed valve and pressure valve is complicated, and all be that matrix is installed with the piston rod, the concentricity requirement of parts such as piston, piston rod, oil cylinder is very high, thereby the accuracy of manufacture that makes piston rod requires very highly, and manufacturability is relatively poor, so that becomes the principal element that cost improves.

The purpose of this utility model is that proposition is a kind of simple in structure, and accuracy of manufacture requires low, and good manufacturability can further improve braking effect, cost-cutting, and the plunger tpe flap type that improves application reliability slows down and pushes up.

The technical solution of the utility model is: the top of slowing down by plunger, housing, declare fast brake activation valve, separator piston, retracing spring and form, the plunger upper end is the mushroom head, declare fast brake activation valve and be installed in the plunger lower end, be provided with separator piston in the plunger, plunger is supported by retracing spring in housing, is in operating altitude.Vehicle wheel rolling presses plunger mushroom head, plunger is glided when entering housing, plunger forces the fluid in the housing to enter plunger cavity through declaring fast brake activation valve, promote to move on the separator piston, when vehicle speed is higher than critical speed, declares fast brake activation valve liquid stream is imposed resistance, thereby make fluid under pressure, enter plunger cavity, cause plunger that wheel is produced higher counter-force, reach the braking purpose; When speed of a motor vehicle subcritical speed, to declare fast brake activation valve liquid stream is not executed resistance, the application force that fluid only need overcome retracing spring just can enter in the housing, so this moment, plunger was very little to the counter-force of wheel, plays brake action hardly.After wheel left plunger, plunger resetted under the use of retracing spring, thereby the fluid of plunger cavity is returned in the housing chamber, and separator piston resets under the negative pressure effect of plunger cavity thereupon.

Below in conjunction with embodiment the utility model is further specified.

Fig. 1 plunger tpe car retardation roof construction scheme drawing.

1 be plunger, 2 for lining, 3 for housing, 4 for separator piston, 5 for the pressure valve spring seat, 6 for pressure valve spring, 7 for dull and stereotyped pressure valve, 8 for spool, 9 for valve seat, 10 for the speed valve spring, 11 for retracing spring, 12 for speed valve seat, 13 for being hold-down bolt towards back-up ring, 15 till the speed valve plate, 14.

The plunger tpe flap type slows down and pushes up, by plunger 1, housing 3, declare fast brake activation valve, separator piston 4, retracing spring 11 etc. and form, declare fast brake activation valve and form by valve seat 9, spool 8, speed valve plate 13, dull and stereotyped pressure valve 7, speed valve spring 10, pressure valve spring 6 etc., plunger 1 upper end is the mushroom head, declare the lower end that fast brake activation valve assembly is installed in plunger 1, be provided with separator piston 4 in the plunger 1, plunger is in operating altitude by retracing spring 11 supports in housing.When vehicle wheel rolling presses plunger 1 mushroom head, plunger 1 is glided when entering in the housing 3, the fluid in the housing 3 enters plunger 1 inner chamber through declaring fast brake activation valve, and promotion separator piston 4 rises; When the speed of a motor vehicle is higher than critical speed, flow through declare fast brake activation valve fluid on speed valve plate 13, the lower surface forms current difference, thereby at speed valve plate 13 upper and lower end faces generation pressure reduction, cause speed valve plate 13 to overcome the predetermincd tension of speed valve spring 10 and close, thereby the oily path of mistake of housing 3 inner chambers and plunger 1 inner chamber is cut off, wheel continues to force plunger 1 to glide, oil liquid pressure moment raising in the housing, when pressure reaches the response pressure of pressure valve 7, dull and stereotyped pressure valve overcomes the predetermincd tension of pressure valve spring 6 and opens, make the fluid in the housing 3 under pressure, enter plunger 1 inner chamber, cause 1 pair of wheel of plunger to produce higher counter-force, wheel rolling is played brake action; When speed of a motor vehicle subcritical speed, roll through declaring the fluid of fast brake activation valve, the difference force that produces on speed valve plate 13 can not overcome the speed valve spring, 10 predetermincd tension, speed valve plate 13 is held open state, the vehicle wheel rolling presses plunger glides and only need overcome the predetermincd tension of retracing spring 11, so the counter-force of 1 pair of wheel of plunger is very little, and wheel rolling is played brake action hardly; Move under the effect of retracing spring 11 and reset when wheel leaves plunger 1, make the fluid of plunger 1 inner chamber return housing 3 inner chambers through declaring fast brake activation valve, separator piston 4 resets under the effect of plunger 1 inner chamber negative pressure thereupon.

The retracing spring 11 on plunger tpe flap type deceleration top also can be located at plunger 1 inner chamber, the upper end of separator piston 4.After wheel left plunger 1, retracing spring 11 promotes separator piston 4 forced the fluid of plunger 1 inner chamber to return in the housing, causes plunger return.In like manner, also can in housing 3, retracing spring all be set, realize the homing action of plunger 1 with plunger 1 inner chamber.

Claims

1, a kind of plunger tpe flap type car retardation pushes up, by housing, plunger, declare fast brake activation valve, separator piston and retracing spring and form, it is characterized in that declaring fast brake activation valve and form by valve seat, spool, speed valve plate, dull and stereotyped pressure valve, speed valve spring, adjustment nut; Spool is installed on the valve seat; Between speed valve plate and the speed valve seat speed valve spring is housed; Between dull and stereotyped pressure valve and the pressure valve spring seat pressure valve spring is housed; Declare the lower end that fast brake activation valve is installed in plunger, plunger is supported by retracing spring in housing.

2, plunger tpe flap type car retardation according to claim 1 pushes up, and it is characterized in that declaring fast brake activation valve valve seat bottom and is provided with the speed valve plate, and speed valve plate, speed valve spring, pressure valve plate and pressure valve spring are located by spool, are installed on the valve seat.