CN203063928U

CN203063928U - Hydraulic parking brake valve

Info

Publication number: CN203063928U
Application number: CN2012206753222U
Authority: CN
Inventors: 郑芳; 景天佑; 刘伟; 郭向洪; 刘宝林; 谢红岩
Original assignee: Henan Aerospace Hydraulic and Pneumatic Technology Co Ltd
Current assignee: Henan Aerospace Hydraulic and Pneumatic Technology Co Ltd
Priority date: 2012-12-10
Filing date: 2012-12-10
Publication date: 2013-07-17
Anticipated expiration: 2022-12-10

Abstract

The utility model relates to a hydraulic parking brake valve. A valve rod and a valve element in the brake valve are in transmission connection through a transmission piece, a pressure maintaining spring is arranged between the transmission piece and the wall of a valve rod cavity, and a pressure releasing spring is arranged between the valve rod and the transmission piece. When the hydraulic parking brake valve is used, the valve element is pushed to move upwards along with increase of the pressure of an oil inlet, deformation of the pressure maintaining spring and compression of the pressure releasing spring can increase constantly until the sum of the spring force of the pressure releasing spring and the upward pushing force of the valve element is equal to the pressure maintaining pressing force of the pressure maintaining spring, the valve element is stopped on a pressure maintaining working position through the transmission piece, and the whole hydraulic parking brake valve is in a pressure maintaining state. The valve rod is pulled, deformation of the pressure maintaining spring and compression of the pressure releasing spring can continue to increase constantly until the sum of the spring force of the pressure releasing spring and the upward pushing force of the valve element is larger than the pressure releasing pressing force of the pressure maintaining spring, the valve element moves upwards to a hydraulic working position along with the transmission piece, and the parking brake function of the whole brake valve is achieved.

Description

A kind of hydraulic parking braking valve

Technical field

The utility model relates to the automobile parking braking technical field, relates in particular to a kind of hydraulic parking braking valve.

Background technology

At present, still adopt compression air brake on domestic most engineering truck.Mostly its brake disc is outer open braking, and namely brake disc is to be exposed in the air to dispel the heat, and very easily is subjected to the influence of vehicle operation environment (sleety weather etc.).And in some in particular cases (as under the mine), for the purpose of safety, do not allow to use electrodynamic braking and compression air brake.The hydraulic pressure Parking is compared with the air pressure Parking, has advantages such as sensitiveer, that the life-span is long.Hydraulic braking also is the developing direction of brake system.

Application number is that 200920119050.6 Chinese utility model patent discloses a kind of hydraulic brake valve, this brake activation valve comprises valve body, offer on the valve body along linearly extended spool chamber, also offer the drainback passage that is communicated with spool chamber on the valve body, oil inlet passage and oil discharge passage, drainback passage is communicated with by the return opening of offering on the spool chamber hole wall with spool chamber, oil inlet passage is communicated with by the oil inlet of offering on the spool chamber hole wall with spool chamber, oil discharge passage is communicated with by the oil outlet of offering on the spool chamber hole wall with spool chamber, return opening and oil inlet are in respectively on the homonymy hole wall at spool chamber two ends, oil outlet is in the midway location place of spool chamber hole wall, and convexing with annular throttling edge at the midway location place of the hole wall of spool chamber, oil outlet just is on the inwall on this throttling edge; Be equipped with the spool of column along its bearing of trend sealing slip at spool chamber, this spool can slide in the endoporus on annular throttling edge, midway location place at the perisporium of spool offers annular throttling edge, and spool directly or by push rod is connected with foot-operated indirectly near an end of return opening, between the cecum hole wall of the other end of spool and spool chamber, be provided with and promote the thrust spring that spool moves to the direction away from oil inlet, offer the torus knot chute that is communicated with oil outlet at the midway location place of spool perisporium, in use, when stretcher is not operated, spool is under the effect of thrust spring, make the torus knot chute near an end of oil inlet by annular throttling along shutoff, the other end stretches out along the end near return opening from annular throttling, thereby makes return opening and oil outlet be communicated with; When stepping on stretcher, spool is under the driving of stretcher, and the resistance that overcomes thrust spring moves to the direction near oil inlet, make simultaneously the side sidewall of close return opening of torus knot chute by annular throttling along shutoff; Continue to trample stretcher, spool can continue to overcome the thrust of thrust spring, move to the direction near oil inlet, an end of the close oil inlet of torus knot chute can expose from the end on annular throttling edge simultaneously, so that oil inlet is communicated with oil outlet, when stretcher was trampled to nadir, the part maximum that the torus knot chute exposes along the end from annular throttling made that the aperture between oil inlet and the oil outlet is maximum; Unclamp stretcher, spool can be under the effect of thrust spring, moves to the direction near return opening, thereby makes and be blocked into and out of hydraulic fluid port, and oil outlet and return opening are communicated with.In whole braking procedure, spool passes through the switch of control oil inlet, oil outlet and return opening under pedal force and thrust spring effect, to realize the connection between the hydraulic fluid port or disconnection in twos, therefore in whole braking procedure, spool need just can make oil inlet and oil outlet be communicated with under the effect of pedal force, and the keeping of the braking mode of drg, and also needs the continuous action of pedal force, can cause great inconvenience to braking during standstill like this, even can not realize braking during standstill.

The utility model content

The purpose of this utility model provides a kind of hydraulic parking braking valve, is intended to solve that the braking mode because of hydraulic brake valve need be continuously applied application force in the prior art, so that the problem of the braking during standstill weak effect of hydraulic brake valve.

In order to realize above purpose, the technical scheme that the utility model adopts is:

The technical scheme of hydraulic brake valve of the present utility model is as follows:

A kind of hydraulic parking braking valve, comprise valve body, spool and valve rod, offer the valve-rod cavity that extends up and down in the described valve body, valve rod stretches in the valve-rod cavity from the upside of valve-rod cavity, and be in the top of spool, spool has be used to oil outlet and return opening are communicated with, make the pressure release working position that oil inlet is disconnected and be used for making oil inlet, the pressurize working position that oil outlet and return opening all are disconnected, be equiped with the force transmission element that is used for transmitting the pressure between spool and the valve rod that cooperates at the above-below direction block with spool above the spool, and between the wall of the chamber of force transmission element and valve-rod cavity, be equiped with the pressurize spring, the pressurize spring has for the pressurize amount of compression that applies downward pressurize thrust when the pressurize working position to force transmission element, be used for applying to force transmission element when the pressure release working position pressure release amount of compression of downward pressure release thrust, the pressure release amount of compression is greater than the pressurize amount of compression; Offer the control chamber that extends up and down in the upper end of force transmission element, the lower end of described valve rod is stretched in the control chamber, and between the wall of the chamber of valve rod and control chamber, be equiped with the pressure release spring, the pressure release spring have that the thrust sum that makes progress for spring force when the pressurize working position and spool is less than or equal to the pressurize thrust so that the force transmission element thrust sum that spring force and spool make progress when stoping the pressurize deflection that spool moves and being used at the pressure release working position greater than the pressure release thrust so that the pressure release deflection that spool moves with force transmission element, described pressure release deflection is greater than the pressurize deflection.

Described force transmission element comprises in body on the periphery that is set in the valve rod lower end and the body seat that ends of guiding assembling along the vertical direction, convex with on the inwall of body and be in the retaining edge of ending the seat top, and end seat have for described retaining cooperates along block up on stop section and for the following stop section down that cooperates with the spool block, described control chamber is the inner chamber of body.

Fixedly have in the lower end port of body and be in described retaining being used for and ending the back-up ring that a block cooperates along the below, and between back-up ring and retaining edge, there is the gap, back-up ring has the endoporus that passes for for the upper end of spool, and described only seat downside is provided with and is in outer the turning edge that being used between back-up ring and the retaining edge cooperates along block with described retaining.

The described seat that ends has the shell-like main body of extending up and down, has on the lower end periphery of shell-like main body outside the annular to turn edge, and described retaining is along distributing ringwise in the periphery of shell-like main body on the inwall of body.

Being arranged with on the lower end periphery of described valve rod leads along the vertical direction is assemblied in the interstage sleeve of body, and convex with for the boss that stops interstage sleeve to be deviate from from the lower end of spool the upper surface that described shell-like main body has for the endoporus that stretches into for described boss and is used for cooperating with the lower surface block of interstage sleeve in the periphery of spool.

Valve rod and spool are in transmission connection by force transmission element in the utility model, and be equiped with the pressurize spring between the chamber wall of force transmission element and valve-rod cavity, between valve rod and force transmission element, be equiped with the pressure release spring, in use, increase along with oil inlet pressure, the promotion spool moves up, the amount of compression of the deflection of pressurize spring and pressure release spring can continue to increase, before the thrust sum that spring force and the spool of pressure release spring makes progress is less than or equal to the pressurize thrust of pressurize spring, spool is blocked in the pressurize working position by force transmission element, it is the oil inlet on the valve body, return opening and oil outlet all are disconnected, reach the necessary hold-off pressure of the maintenance reverse Parking power of vehicle fast, whole hydraulic brake valve is in packing state; The pulling valve rod, make the increasing that can keep of the amount of compression of the deflection of pressurize spring and pressure release spring, the thrust sum that makes progress until spring force and the spool of pressure release spring is greater than the pressure release thrust of pressurize spring, spool is with moving to the pressure release working position on the force transmission element, be oil outlet and the return opening connection on the valve body, oil inlet is disconnected, make whole brake activation valve be in the pressure release state, realize the parking braking function of whole brake activation valve, the braking mode because of hydraulic brake valve need be continuously applied application force in the prior art thereby solved, so that the problem of the braking during standstill weak effect of hydraulic brake valve.

Description of drawings

Fig. 1 is the structural representation of embodiment of the present utility model under the initialization state;

Fig. 2 is the structural representation of embodiment of the present utility model under middle mode of operation;

Fig. 3 is the structural representation of embodiment of the present utility model under final mode of operation.

The specific embodiment

The embodiment of hydraulic brake valve of the present utility model, as shown in Figure 1 to Figure 3, this hydraulic brake valve is made of valve body 1, spool 2 and drive configuration.The valve-rod cavity 1-2 that offers the spool chamber 1-1 of the column of extending along the vertical direction on the valve body 1 and be in spool chamber 1-1 top and be communicated with spool chamber 1-1, offer oil inlet 1-3 on the upper end hole wall of spool chamber 1-1, offer oil outlet 1-4 at the bottom of the following stomidium, hole wall between oil inlet 1-3 and oil outlet 1-4 offers return opening 1-5, spool 2 slipper seal along the vertical direction is assemblied in the described spool chamber 1-1, and offer the blind hole of bottom-up extension at spool 2, the aperture of blind hole is on the lower end surface of spool 2, cecum is in the upper end of spool 2, and the hole wall of position offers and connects the inside and outside through hole of spool 2 at the bottom of the hole of blind hole, this through hole and blind hole have constituted flow-guiding channel 2-1, the outer end opening of through hole is the upper end open of flow-guiding channel 2-1, and the aperture of blind hole is the lower ending opening of flow-guiding channel 2-1.

Described drive configuration comprises that the lower end stretches among the valve-rod cavity 1-2 and be in the valve rod 3 of spool chamber 1-1 top, the only seat 4 of installing between valve rod 3 and the spool 2, be arranged on the body 5 that ends on the seat 4, sheathed pressurize spring 6 on the periphery of body 5, the installing of the inside of body 5 be set in pressure release spring 7 on valve rod 3 peripheries, wherein the upper end of valve rod 3 is hinged on the corner of parking brake handle 8 by articulated structure 11, valve rod 3 middle parts seal in the upper shed of offering on the last side walls that is slidedly assemblied in valve-rod cavity 1-2 along the vertical direction, the lower end of valve rod 3 is stretched in the body of installing among the valve-rod cavity 1-2 5, and by binding bolt 9 spring perch 10 is arranged fixedly in the lower end of valve rod 3, spring perch 10 has the lower edge 3-1 that is convexly equipped with in valve rod 3 peripheries, the inwall of body 5 middle part convex with lower edge 3-1 the above-below direction block cooperate interior along 5-1, convex with the upper edge 5-2 that stretches out near the inboard at body 5 centers along 5-1 from interior at the upper end of body 5 inwall, between body 5 upper edge 5-2 and valve rod 3 lower edge 3-1, be equiped with pressure release spring 7.Convex with outer 5-3 on the lower end periphery of body 5, pressurize spring 6 devices are between the upper side wall of this outer 5-3 and valve-rod cavity 1-2.

The utility model in use, when parking brake handle 8 is in initial position, whole hydraulic brake valve also is in initial position, it is the lowest positions place that spool 2 is in spool chamber 1-1, this moment, oil inlet 1-3 was communicated with oil outlet 1-4 by the flow-guiding channel 2-1 that offers on the spool 2, make hydraulic oil inject oil outlet 1-4 from oil inlet 1-3, in fuel-displaced pipeline, form high pressure, along with the pressure of the hydraulic oil in the oil outlet 1-4 improves constantly, jack-up can make progress spool 2, until with the lower end of spool 2 roof pressures to gland, the upper end open of flow-guiding channel 2-1 can stagger mutually with oil inlet 1-3 simultaneously, thereby make oil inlet 1-3 by the sidewall shutoff of spool 2, and the upper end open of flow-guiding channel 2-1 is by the hole wall shutoff of spool chamber 1-1, pressure in the oil outlet 1-4 reaches and keeps the necessary hold-off pressure of the reverse Parking power of vehicle, and whole hydraulic brake valve is in packing state;

Rotate parking brake handle 8 then to meta, valve rod 3 can move up under the drive of parking brake handle 8, thereby by valve rod 3 lower edge 3-1 pressure release spring 7 is upwards held up, the upper end of pressure release spring 7 can be by body 5 upper edge 5-2 with body 5 jack-up upwards, and then make the elastic force of body 5 desirable pressurize springs 6 move up, simultaneously under the effect of oil outlet 1-4 hydraulic oil, spool 2 meeting pushing tows end seat 4 and move up, until pressurize spring 6 to down spring, the upward pressure of hydraulic oil reaches balance in the upwards elastic force of pressure release spring 7 and the oil outlet 1-4, this moment is because moving up of spool 2 can make the cavity volume between spool 2 lower surfaces and the oil outlet 1-4 increase, and then make the interior hydraulic fluid pressure of oil outlet 1-4 reduce, pressure until oil outlet 1-4 hydraulic oil is reduced to initial adjustment pressure, this moment, brake system was started working, and hydraulic brake valve is realized abrupt pressure reduction for the first time;

Continue rotation parking brake handle 8, parking brake handle 8 drives valve rod 3 to be continued to move up, in valve rod 3 lower edge 3-1 and body 5, cooperate along the 5-1 block, valve rod 3 will drive body 5 and spool 2 moves up synchronously this moment, be in return opening 1-5 position until the lower end of spool 2, make oil outlet 1-4 be communicated with by the cavity between spool 2 lower surfaces and the spool chamber 1-1 hole wall with return opening 1-5, hydraulic oil in the oil outlet 1-4 is discharged from return opening 1-5, make the pressure in the oil outlet 1-4 reduce to 0MPa, realize braking during standstill by the current location of the maintenance of the closing appliance in the parking brake handle 8 parking brake handle 8 this moment.

The utility model in use, when disconnecting into and out of the connection between the hydraulic fluid port 1-4, directly the sidewall shutoff oil inlet 1-3 by spool 2 just can realize, and in the process of the sidewall shutoff oil inlet 1-3 that passes through spool 2, the hydraulic oil that flows out among the oil inlet 1-3 can be discharged among the oil outlet 1-4 by flow-guiding channel 2-1 constantly, thereby has avoided the problem of oil inlet 1-3 place hydraulic oil water conservancy diversion.Twice bust by oil outlet 1-4 internal pressure realized service brake and braking during standstill, namely when the oil outlet 1-4 pressure bust first time, thereby brake system is started working and is realized service brake, and controls the braking force of service brake by the meta position of control parking brake handle 8; During the oil outlet 1-4 pressure bust second time, the service brake process finishes, and vehicle has stopped mobile, and this moment can be by the reduction again of oil outlet 1-4 hydraulic oil, and the braking force maximum during the assurance braking during standstill guarantees Parking stability.Therefore the utlity model has snap catch, brake the advantage reliable, that hydraulic fluid port is rationally distributed, oil inlet 1-3 does not have oil return.

In the above-described embodiments, in the drive configuration valve rod by pressurize spring, pressure release spring, end seat and body drives the spool action, in other embodiments, also can remove pressure release spring or remove the pressure release spring and pressurize spring or remove pressurize spring, pressure release spring and end seat in the drive configuration.When only removing the pressure release spring, and the parking brake handle is when being in meta, the downward pressure of pressurize spring and the hydraulic oil of the oil outlet balance that upwards pressure, thereby by selecting for use the less relatively pressurize spring of elasticity modulus just can make the braking procedure of hydraulic brake valve consistent with above-described embodiment; When removing pressure release spring and pressurize spring, and the parking brake handle is when being in meta, valve rod acts on downward pressure on the spool and oil outlet hydraulic oil and acts on the mutual balance that upwards pressure on the spool by ending seat, thereby can increase the stroke of handle rotation and/or the increase distance between the edge in valve rod lower edge and the body when being in initial position, soft operation when operating by the user reduces the infringement that the braking of hydraulic brake valve rigidity causes vehicle; When removing pressurize spring, pressure release spring and ending seat, the lower end of valve rod directly is in transmission connection in the upper end of spool, can only rely on user's the soft property of M/C to reduce the damage that the rigidity braking causes vehicle in use.

In the above-described embodiments, return opening is in into and out of between the hydraulic fluid port, in other embodiments, return opening also can be in the top of oil inlet, in use, when spool moves up, realize being communicated with of return port and flow-guiding channel by another through hole of offering at the blind hole hole wall of flow-guiding channel, thereby make return opening be communicated with by the return flow line of offering on the spool with oil outlet, and the lower end of this return flow line overlap with flow-guiding channel.In addition, the setting that also can oppose relatively of return flow line and flow-guiding channel is just offered two passages that cut off mutually at spool, and wherein a passage is flow-guiding channel, another passage is the return flow line, and the upper end open of return flow line should be in the flow-guiding channel top.

In the above-described embodiments, the lower edge of valve rod turns edge for fixing the following of spring perch in valve rod lower end, in other embodiments, the lower edge of valve rod also can be for revolving the nut that is located at the valve rod lower end, being wholely set turning edge or be convexly equipped with crossette on the valve rod periphery etc. in the valve rod lower end.

In the above-described embodiments, the utility model is applied on the parking brake, just be applied on the braking during standstill, in other embodiments, the utility model also can be applied on the service brake, the upper end of corresponding valve rod is in transmission connection on the service brake pedal, belongs to prior art as for the annexation between service brake pedal and the valve rod, therefore repeats no more.

In the above-described embodiments, end that annular that seat arranges by its lower end is outer to turn edge between the spacing back-up ring and leave from office terrace that is assemblied in port, body lower end, in other embodiments, ending seat also can one be connected on the body, perhaps remove and end seat, and with the spool overstriking, also or with body attenuate, the upper surface of spool can be cooperated with the lower surface block of body, and this moment, body just can substitute the force transmission element that is made of body and bearing.

Claims

1. hydraulic parking braking valve, comprise valve body, spool and valve rod, offer the valve-rod cavity that extends up and down in the described valve body, valve rod stretches in the valve-rod cavity from the upside of valve-rod cavity, and be in the top of spool, spool has be used to oil outlet and return opening are communicated with, make the pressure release working position that oil inlet is disconnected and be used for making oil inlet, the pressurize working position that oil outlet and return opening all are disconnected, it is characterized in that, be equiped with the force transmission element that is used for transmitting the pressure between spool and the valve rod that cooperates at the above-below direction block with spool above the spool, and between the wall of the chamber of force transmission element and valve-rod cavity, be equiped with the pressurize spring, the pressurize spring has for the pressurize amount of compression that applies downward pressurize thrust when the pressurize working position to force transmission element, be used for applying to force transmission element when the pressure release working position pressure release amount of compression of downward pressure release thrust, the pressure release amount of compression is greater than the pressurize amount of compression; Offer the control chamber that extends up and down in the upper end of force transmission element, the lower end of described valve rod is stretched in the control chamber, and between the wall of the chamber of valve rod and control chamber, be equiped with the pressure release spring, the pressure release spring have that the thrust sum that makes progress for spring force when the pressurize working position and spool is less than or equal to the pressurize thrust so that the force transmission element thrust sum that spring force and spool make progress when stoping the pressurize deflection that spool moves and being used at the pressure release working position greater than the pressure release thrust so that the pressure release deflection that spool moves with force transmission element, described pressure release deflection is greater than the pressurize deflection.

2. a kind of hydraulic parking braking valve according to claim 1, it is characterized in that, described force transmission element comprises in body on the periphery that is set in the valve rod lower end and the body seat that ends of guiding assembling along the vertical direction, convex with on the inwall of body and be in the retaining edge of ending the seat top, and end seat have for described retaining cooperates along block up on stop section and for the following stop section down that cooperates with the spool block, described control chamber is the inner chamber of body.

3. a kind of hydraulic parking braking valve according to claim 2, it is characterized in that, fixedly have in the lower end port of body and be in described retaining being used for and ending the back-up ring that a block cooperates along the below, and between back-up ring and retaining edge, there is the gap, back-up ring has the endoporus that passes for for the upper end of spool, and described only seat downside is provided with and is in outer the turning edge that being used between back-up ring and the retaining edge cooperates along block with described retaining.

4. according to claim 2 or 3 described a kind of hydraulic parking braking valves, it is characterized in that, the described seat that ends has the shell-like main body of extending up and down, has on the lower end periphery of shell-like main body outside the annular to turn edge, and described retaining is along distributing ringwise in the periphery of shell-like main body on the inwall of body.

5. a kind of hydraulic parking braking valve according to claim 4, it is characterized in that, being arranged with on the lower end periphery of described valve rod leads along the vertical direction is assemblied in the interstage sleeve of body, and convex with for the boss that stops interstage sleeve to be deviate from from the lower end of spool the upper surface that described shell-like main body has for the endoporus that stretches into for described boss and is used for cooperating with the lower surface block of interstage sleeve in the periphery of spool.