CN201154700Y

CN201154700Y - Controlled brake relay valve

Info

Publication number: CN201154700Y
Application number: CNU2007203116912U
Authority: CN
Inventors: 傅树苗
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-12-13
Filing date: 2007-12-13
Publication date: 2008-11-26
Anticipated expiration: 2017-12-13

Abstract

The utility model relates to a controllable brake relay valve, belonging to the technical field of the vehicle brake valve parts. The utility model is characterized in that: the interior of an upper body is provided with a piston which can move up and down, the upper surface of the piston is connected with a piston guide handle which is matched with the upper body in a sliding way, an outer ring of the piston is connected with the upper body in a matching way, an inner ring of the piston is connected with a lower body in a matching way, the lower body is connected with a valve, the side end of the valve is matched with an air exhaust retaining base, and the valve is connected with the air exhaust retaining base by a return spring. The controllable brake relay valve has simple and reasonable structure, high sensitivity and good braking effect; with the entirely modified design of the relay valve mechanism, when the brake force is insufficient in the emergency brake of an overloading vehicle, the sensitivity of rear wheel brake can be obviously improved by the adjusting function of the piston; with an electromagnetic valve additionally arranged, when an automobile is in an idle load state or in rainy and snowy situation, the brake force at the front wheel and the rear wheel can be selected to be equal, thus effectively preventing the excessively slipping or whipping at the rear wheel. When the automobile is in an overloading state, the brake force at the rear wheel is selected to be increased, thus achieving good braking effect.

Description

The controllable brake relay valve

Technical field

The utility model belongs to engine brake valve parts technical field, is specially a kind of controllable brake relay valve.

Background technology

The basic relay valve that adopts of automobile-used trailing wheel braking, common relay valve causes the back braking retardation easily because brake piping is long, the compression air brake reaction time is slow, front and back wheel braking life period is poor.Especially when automobile when heavy duty, front-wheel locks earlier, trailing wheel since moment braking force not enough, the whipping accident takes place easily.Existing relay valve, the area of thrust surface in two chambeies are the same about the piston, control air pressure equates with output pressure, piston uses the back friction to increase and lags behind, the relay valve of this structure exists sensitivity low, problems such as safety and stability are not high, urgent need is a kind of highly sensitive on the automobile back wheel brake system at present, can select the controllable brake relay valve of braking force again when unloaded or heavily loaded.

The utility model content

The purpose of this utility model is to overcome the above-mentioned problems in the prior art, by to the design of the overall improvement of relay valve mechanism, provides a kind of technical scheme of controllable brake relay valve of highly sensitive, good braking effect.

Described controllable brake relay valve, comprise upper body, lower body, piston, valve, it is characterized in that being provided with in the upper body piston moving up and down, piston upper surface connects the piston guide handle that is provided with the upper body bearing fit, piston outer ring and upper body are connected, and piston inner ring and lower body are connected, and connect on the lower body valve is set, the side of valve is equipped with the exhaust block seat, is connected by pull back spring elasticity between valve and the exhaust block seat.

Described controllable brake relay valve is characterized in that piston big end and the upper body sliding connection of piston outer ring by being provided with, piston small end and the lower body sliding connection of piston inner ring by being provided with.

Described controllable brake relay valve is characterized in that the connection of lower body upper surface is provided with step, and step is by seal ring and the sliding connection of piston small end.

Described controllable brake relay valve is characterized in that the connection of valve side is provided with the fixedly spring perch of pull back spring.

Described controllable brake relay valve is characterized in that exhaust block seat bottom is equipped with dustproof film.

Described controllable brake relay valve is characterized in that interior connection of admission port of lower body is provided with the spiral filtering net.

Described controllable brake relay valve it is characterized in that air extractor duct is provided with through hole by connection on it and is communicated with the D chamber, and the connection of the bottom of air extractor duct is provided with blind hole.

Described controllable brake relay valve is characterized in that being equipped with T-pipe joint on the air extractor duct of lower body, and T-pipe joint links to each other with the electromagnetic valve admission port by tracheae, and the electromagnetic valve air extractor duct links to each other with the lower body air extractor duct.

Described controllable brake relay valve is characterized in that described spring perch is provided with air extractor vent.

Above-mentioned controllable brake relay valve, simple and reasonable, highly sensitive, good braking effect, by overall improvement design to relay valve mechanism, when self-propelled vehicle heavy duty emergency brake feels that braking force is not enough, regulating action by piston, make rear-wheel braking force be in magnifying state, improve the sensitivity of trailing wheel braking significantly, installing electromagnetic valve additional can select the front and back wheel braking force equally big under situations such as zero load or sleety weather when automobile, preventing effectively that rear tyre is excessive skids or whipping, select trailing wheel during in heavy duty when automobile and increase brake control power, good braking effect.

Description of drawings

Fig. 1 is the utility model sectional structure scheme drawing;

Fig. 2 is the utility model integral structure scheme drawing.

Among the figure: 1-upper body, 2-piston, the big end of 3-piston, 4-piston small end, 5-seal ring, 6-step, 7-O type circle, 8-lower body, 9-spiral filtering net, 10-exhaust block seat, the dustproof film of 11-, 12-valve, 13-pull back spring, 14-blind hole, 15-through hole, 16-spring perch, 17-air extractor vent, 18-piston guide handle, 19-admission port, 20-air extractor duct, 21-T-pipe joint, 22-tracheae, 23-electromagnetic valve, 24-air extractor duct, 25-air extractor duct.

The specific embodiment

Below in conjunction with Figure of description, technical solutions of the utility model are described further by embodiment.

As shown in the figure, connection is provided with piston 2 moving up and down on the upper body 1, and the connection of piston 2 upper surfaces is provided with piston guide handle 18, and piston guide handle 18 is a cylinder, be provided with cavity between piston guide handle 18 and the upper body 1, and piston guide handle 18 and upper body 1 sliding connection.The big end of the two-piston that is provided with on piston 2 outer rings 3 and upper body 1 are by the seal ring sealing and can move up and down, and the step 6 that is connected setting on the piston small end 4 that is provided with on piston 2 inner rings and the lower body 8 passes through seal ring 5 sliding connections.The endoporus of step 6 increases O type ring recess, places an O type circle 7 in the groove, and upper body 1 is connected by O type circle 7 and lower body 8.The endoporus of the step 6 that increases on piston small end 4 and the lower body 8 forms long bearing fit, is synchronized with the movement with piston guide handle 18, the big end 3 of piston, makes piston 2 and upper body 1, lower body 8, and the right alignment of valve 12 obtains reliable guarantee, and piston 2 motions are more steady.Connect on the lower body 8 valve 12 is set, valve 12 upper surfaces connect valve rubber are set, the effect of valve rubber be when reducing valve 12 motions with the friction force of lower body 8 appearance, make valve 12 remain flexibly, stablize, durable.Valve 12 outer sockets are provided with spring perch 16, and valve 12 is by connecting the spring perch 16 and exhaust block seat 10 resilient engagement that is provided with on it.Spring perch 16 forms bearing fit closely with valve body inner bore, and an end of pull back spring 13 is arranged on the spring perch 16, and the other end is arranged on the exhaust block seat 10.Connection is provided with air extractor vent 17 on the spring perch 16, and spring perch 16 has the supporting positioning action, makes valve 12 motion under pull back spring 13 effects steady; The ventilation effect makes B chamber air pressure can successfully be input to the C chamber, prevents valve 12 B chamber and C chamber formation difference of pressure when motion; Directional tagging makes valve 12 returns more accurate, and it is more steady to move, the potted line that guarantees the sealing surface of piston 2 and valve 12 effectively on same axis, thereby guarantee that valve 12 intake and exhaust are smooth and easy, seal intact.Exhaust block seat 10 bottoms are equipped with dustproof film 11, and the effect of dustproof film 11 is to prevent that particles such as exterior dust, impurity from entering valve inner, keep seal cavity ground cleaning in the valve.Connect on the A chamber in the admission port 19 of lower body 8 spiral filtering net 9 is set, spiral filtering net 9 effect is to have stoped particles such as dust in the automobile pipeline, impurity to enter valve inner, and the sealing surface of valve 12 is kept clean, and guarantees sealing property, prevent the valve hair fastener, increase the service life of this valve.Connect the through hole 15 that setting is communicated with the D chamber on the air extractor duct 24, the gas in the D chamber can be by through hole 15 discrepancy air extractor ducts 24, and the bottom connection of air extractor duct 24 is provided with blind hole 14, C chamber and air extractor duct 24 interfaces is cut off D chamber air and extraneous partition.Be equipped with T-pipe joint 21 on the air extractor duct 20 of lower body 8, T-pipe joint 21 is connected with electromagnetic valve 23 admission port A by tracheae 22, and electromagnetic valve 23 air extractor duct R are connected with lower body air extractor duct 24.

When electromagnetic valve 23 master cocies during in off-state, electromagnetic valve 23 outages, electromagnetic valve 23 air intake valves are closed, the air in C chamber can not enter the D chamber, and the air in D chamber is connected with extraneous by electromagnetic valve 23 drain taps, control gas pressure area is C, D two chamber sums like this, and the output pressure active area is the C chamber, piston 2 output pressure area of thrust surface are 54% of control air pressure area of thrust surface, thereby make control air pressure and output pressure ratio reach 1: 1.84, when heavy duty, obviously improve the sensitivity of trailing wheel braking.When electromagnetic valve 23 master cocies during in on-state, electromagnetic valve 23 work of switching on immediately, air intake valve is opened, A, the ventilation of R two interfaces, like this, the pressurized air of coming out from the C chamber is through the threeway air extractor duct, enter in the air extractor duct 24 by electromagnetic valve 23 again, enter relay valve D chamber by through hole 15 again, 1 is connected the O type circle 7 that is provided with and in air extractor duct 24 interfaces bottom blind hole 14 is set with lower body 8 joints in the upper body, with C chamber and air extractor duct 24 interfaces partition, D chamber air just cuts off with the external world, can not leak, the result makes relay valve C, D two chambeies are connected by electromagnetic valve 23, piston 2 about two chamber air pressure equal, and air pressure and lower body air extractor duct 20 are controlled in the E chamber on the

upper body

1,24,25 output pressure ratios are 1: 1, effectively prevent trailing wheel because the excessive and tyre slip of braking force.Automobile can select the front and back wheel braking force equally big under situations such as zero load or sleety weather, prevents from effectively that rear tyre is excessive to skid or whipping.

Claims

1. controllable brake relay valve, comprise upper body (1), lower body (8), piston (2), valve (12), it is characterized in that being provided with in the upper body (1) piston moving up and down (2), piston (2) upper surface connects the piston guide handle (18) that is provided with upper body (1) bearing fit, piston outer ring and upper body (1) are connected, piston inner ring and lower body (8) are connected, lower body (8) is gone up to connect valve (12) is set, the side of valve (12) is equipped with exhaust block seat (10), is connected by pull back spring (13) elasticity between valve (12) and the exhaust block seat (10).

2. controllable brake relay valve as claimed in claim 1 is characterized in that the piston big end (3) and upper body (1) sliding connection of piston outer ring by being provided with, the piston small end (4) and lower body (8) sliding connection of piston inner ring by being provided with.

3. controllable brake relay valve as claimed in claim 1 is characterized in that the connection of lower body (8) upper surface is provided with step (6), and step (6) is by seal ring (5) and piston small end (4) sliding connection.

4. controllable brake relay valve as claimed in claim 1 is characterized in that the connection of valve (12) side is provided with the fixedly spring perch (16) of pull back spring (13).

5. controllable brake relay valve as claimed in claim 1 is characterized in that exhaust block seat (10) bottom is equipped with dustproof film (11).

6. controllable brake relay valve as claimed in claim 1 is characterized in that interior connection of admission port (19) of lower body (8) is provided with spiral filtering net (9).

7. controllable brake relay valve as claimed in claim 1, the air extractor duct (24) that it is characterized in that lower body (8) is provided with through hole (15) and is communicated with the D chamber by connecting on it, and the connection of the bottom of air extractor duct (24) is provided with blind hole (14).

8. controllable brake relay valve as claimed in claim 1, it is characterized in that being equipped with T-pipe joint (21) on the air extractor duct (24) of lower body (8), T-pipe joint (21) links to each other with electromagnetic valve (23) admission port by tracheae (22), and electromagnetic valve (23) air extractor duct links to each other with lower body (8) air extractor duct (24).

9. controllable brake relay valve as claimed in claim 4 is characterized in that described spring perch (16) is provided with air extractor vent (17).