CN202130443U - Brake valve for bulldozer - Google Patents
Brake valve for bulldozer Download PDFInfo
- Publication number
- CN202130443U CN202130443U CN201120213209U CN201120213209U CN202130443U CN 202130443 U CN202130443 U CN 202130443U CN 201120213209 U CN201120213209 U CN 201120213209U CN 201120213209 U CN201120213209 U CN 201120213209U CN 202130443 U CN202130443 U CN 202130443U
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- chamber
- valve
- brake
- cavity
- bulldozer
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Abstract
The utility model discloses a brake valve for a bulldozer, comprising a travelling brake valve and a stopping brake valve integrated in a same valve body. A first reset elastic piece is arranged between a first valve rod and a valve body of the stopping brake valve connected with a stopping brake operation rod; a cavity A, a cavity B and a cavity G are arranged on the valve body, the cavity A is communicated with an oil inlet, when the cavity A and the cavity B are communicated, the cavity B and the cavity G are closed, and when the cavity A and the cavity B are closed, the cavity B and the cavity G are communicated; a second reset elastic piece is arranged between a second valve rod and the valve body of the travelling brake valve connected with a brake pedal, a cavity C, a cavity D and a cavity E are arranged on the valve body, when the cavity B and the cavity C are communicated, the cavity D is communicated with a back pressure oil port of a brake piston, when the cavity C and the cavity D are communicated, the cavity D and the cavity E are closed, and when the cavity C and the cavity D are closed, the cavity D and the cavity E are communicated. In the utility model, the pipelines can be arranged conveniently, the volume is small, the functions of the travelling brake and the stopping brake can be achieved simultaneously, and the error walking of the bulldozer after being started can be eliminated.
Description
Technical field
The utility model relates to bulldozer brake system technical field, particularly a kind of bulldozer brake activation valve.
Background technology
Hydraulic transmission braking in a turn control cock is one of core apparatus of current advanced bulldozer employing.The braking in a turn valve base that bulldozer hydraulic transmission is at present used originally has two kinds of forms, and a kind of is the control steering clutch that combined by hand change over valve and flow flow divider valve and convertible valve, the brake activation valve of brake equipment.Another kind is to turn to the control of afterwards braking earlier to turning to brake spool respectively by manual linkage apparatus, and first kind of structure of this kind texture ratio has the little characteristics of volume.
The most of manual reverse of direction linkage that adopts of present hydrostatic drive bulldozer braking turns to the control of afterwards braking earlier to turning to brake spool respectively; And the no parking brake function of valve itself, can not utilize the structure of valve self to eliminate the mistake walking action that bulldozer occurs after start.For the differential steering bulldozer, steering swivel system is independent power steering system, must adopt independent brake activation valve that brake equipment is controlled.
Therefore, how will brake with steering swivel system and to separate, and make brake activation valve have service brake and parking brake function simultaneously, be the technical matters that those skilled in the art need to be resolved hurrily.
The utility model content
In view of this, the utility model provides a kind of bulldozer brake activation valve, separates will brake with steering swivel system, and makes brake activation valve have service brake and parking brake function simultaneously.
For realizing above-mentioned purpose, the utility model provides following technical scheme:
A kind of bulldozer brake activation valve comprises the service brake valve and the stopping brake valve that are integrated in the same valve body;
Be provided with first return springs between first valve rod that links to each other with the stopping brake control lever of said stopping brake valve and the said valve body; Said valve body is provided with A chamber, B chamber and G chamber; Said A chamber communicates with said oil inlet, and when said A chamber and said B chamber were communicated with, ended in said B chamber and said G chamber; When ended in said A chamber and said B chamber, said B chamber and said G chamber were communicated with;
Be provided with second return springs between second valve rod that links to each other with brake pedal of said service brake valve and the said valve body; Said valve body is provided with C chamber, D chamber and E chamber, and said B chamber communicates with said C chamber, and said D chamber communicates with the back pressure hydraulic fluid port of brake piston; When said C chamber and said D chamber are communicated with; End in said D chamber and said E chamber, and when ended in said C chamber and said D chamber, said D chamber and said E chamber were communicated with.
Preferably, in above-mentioned bulldozer brake activation valve, also be provided with the F chamber that is communicated with said G chamber on the said valve body.
Preferably, in above-mentioned bulldozer brake activation valve, said first valve rod is provided with and is respectively applied for the first piston that cuts off said A chamber and said B chamber, and is used to cut off second piston in said B chamber and said G chamber.
Preferably, in above-mentioned bulldozer brake activation valve, said second valve rod is provided with and is respectively applied for the 3rd piston that cuts off said C chamber and said D chamber, and is used to cut off the 4th piston in said D chamber and said E chamber.
Preferably, in above-mentioned bulldozer brake activation valve, said second valve rod specifically comprises:
The guide pin bushing that links to each other with said brake pedal;
Be inserted in the said guide pin bushing, and the axle that links to each other with this guide pin bushing;
Be sheathed on the spool on the said axle, said spool is provided with said the 3rd piston and said the 4th piston;
Be arranged at the plunger in the said spool, and this plunger one end offsets the other end and said spool formation H chamber with said axle.
Preferably, in above-mentioned bulldozer brake activation valve, said second return springs is arranged between the plug screw and said spool that is mounted on the said valve body.
Preferably, in above-mentioned bulldozer brake activation valve, also comprise respectively the 3rd return springs that links to each other with said guide pin bushing and said axle.
Preferably, in above-mentioned bulldozer brake activation valve, first return springs and said second return springs are compression spring.
Can find out that from above-mentioned technical scheme a kind of bulldozer brake activation valve that the utility model provides comprises the service brake valve and the stopping brake valve that are integrated in the same valve body; Be provided with first return springs between first valve rod that links to each other with the stopping brake control lever of stopping brake valve and the valve body, valve body is provided with A chamber, B chamber and G chamber, and the A chamber communicates with oil inlet; When A chamber and B chamber are communicated with; End in B chamber and G chamber, and when ended in A chamber and B chamber, B chamber and G chamber were communicated with; Be provided with second return springs between second valve rod that links to each other with brake pedal of service brake valve and the valve body; Valve body is provided with C chamber, D chamber and E chamber, and the B chamber communicates with the C chamber, and the D chamber communicates with the back pressure hydraulic fluid port of brake piston; When C chamber and D chamber are communicated with; End in D chamber and E chamber, and when ended in C chamber and D chamber, D chamber and E chamber were communicated with.
The utility model is when brake pedal during in the release position, gets into the A chamber from the oil of drive pump through main by pass valve, then through the B chamber, C chamber and D chamber flow to the back pressure hydraulic fluid port of brake piston, promotes the Piston Compression retarding spring with brake off.When stepping on brake pedal, second valve rod is pushed to the right side.At this moment, C chamber and D chamber are closed, and D chamber and E chamber are communicated with, and promptly return opening is opened, and stop from the oil entering A chamber of drive pump and in the C chamber this moment.Flow into the part oil that brake plunger forms back pressure and be discharged to the E chamber from the D chamber, oil pressure is descended, therefore second valve rod is shifted to the left side at the tension force of second return springs, like this D chamber and E chamber is closed, and oil pressure except that the D chamber is no longer further descended and remains unchanged.If step on brake pedal again, repeat aforesaid operations, when valve reaches its end of travel, with complete brake activation.
If the stopping brake securing rod is in " locking " position, first valve rod of stopping brake valve is pulled to the left side, and at this moment, A chamber and B chamber are closed, and open in B chamber and G chamber, from the oil entering A chamber of drive pump and stop.The oil that flows to the brake piston hydraulic fluid port and form back pressure from the D chamber to the C chamber, B chamber and G chamber and be discharged.First valve rod of stopping brake valve still is pulled to left side and fixing.Make the live back pressure of device piston hydraulic fluid port of braking continue to descend, braking is applied fully and is kept this state.When even driving engine starts once more, also keep this state, promptly it utilizes the structure of valve self to eliminate the mistake walking action that bulldozer occurs after start.
The bulldozer brake activation valve that the utility model provides is installed between driving system pump and the brake plunger; When stepping on brake pedal or pull on the stopping brake control lever; Oil stream to brake piston is cut off; Under the effect of spring force, brake piston is shifted brake disc and friction lining together onto, and brake activation; When being used for stopping brake, cut off the oil stream that all gets into brake piston, apply the braking on left side and right side simultaneously.The utility model service brake and stopping brake are integrated in one, and piping layout is convenient, and volume is little, easy arrangement; Have service brake and parking brake function simultaneously, and can utilize the structure of valve self to eliminate the mistake walking action that bulldozer occurs after start.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiment of the utility model, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The sectional structure scheme drawing of the bulldozer brake activation valve that Fig. 1 the utility model embodiment provides;
The hydraulic schematic diagram of the bulldozer brake activation valve that Fig. 2 provides for the utility model embodiment.
The specific embodiment
The utility model discloses a kind of bulldozer brake activation valve, separate, and make brake activation valve have service brake and parking brake function simultaneously will brake with steering swivel system.
To combine the accompanying drawing among the utility model embodiment below, the technical scheme among the utility model embodiment is carried out clear, intactly description, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
See also Fig. 1 and Fig. 2, the sectional structure scheme drawing of the bulldozer brake activation valve that Fig. 1 the utility model embodiment provides; The hydraulic schematic diagram of the bulldozer brake activation valve that Fig. 2 provides for the utility model embodiment.
The bulldozer brake activation valve that the utility model provides comprises the service brake valve 2 and stopping brake valve 1 that are integrated in the same valve body.Wherein, Be provided with first return springs 4 between first valve rod that links to each other with the stopping brake control lever of stopping brake valve 1 and the valve body 3; When pulling stopping brake control lever, this first return springs 4 of first valve rod compression is behind stopping brake control lever return; First valve rod returns to reference position under the elastic force effect of first return springs 4.
Valve body 3 is provided with A chamber, B chamber and G chamber, and the A chamber communicates with oil inlet 51, and hydraulic oil at first gets into the A chamber through oil inlet 51, the stopping brake control lever not when pulled, A chamber and B chamber are communicated with, end in B chamber and G chamber; At the stopping brake control lever when pulled, end in A chamber and B chamber, and B chamber and G chamber are communicated with, and through the moving in valve body 3 of first valve rod, realizes that the connected sum between corresponding each chamber ends.
Be provided with second return springs 6 between second valve rod that links to each other with brake pedal of service brake valve 2 and the valve body 3, valve body 3 is provided with C chamber, D chamber and E chamber, and the B chamber communicates with the C chamber, and the D chamber communicates with the back pressure hydraulic fluid port of brake piston.When brake pedal was not operated, C chamber and D chamber were communicated with, and end in D chamber and E chamber; When brake pedal was operated, ended in C chamber and D chamber, and D chamber and E chamber are communicated with, and through the moving in valve body 3 of second valve rod, realizes that the connected sum between corresponding each chamber ends.
The utility model is when brake pedal during in the release position; Oil from drive pump gets into the A chamber through main by pass valve; Then through the B chamber, C chamber and D chamber flow to the back pressure hydraulic fluid port of the brake piston of left drg 30 and right drg 40 respectively through left drg hydraulic fluid port 31 and right drg hydraulic fluid port 41, promote the Piston Compression retarding spring with brake off.When stepping on brake pedal, second valve rod is pushed to the right side.At this moment, C chamber and D chamber are closed, and D chamber and E chamber are communicated with, and promptly return opening is opened, and stop from the oil entering A chamber of drive pump and in the C chamber this moment.Flow into the part oil that brake plunger forms back pressure and be discharged to the E chamber from the D chamber, oil pressure is descended, therefore second valve rod is shifted to the left side at the tension force of second return springs, like this D chamber and E chamber is closed, and oil pressure except that the D chamber is no longer further descended and remains unchanged.If step on brake pedal again, repeat aforesaid operations, when valve reaches its end of travel, with complete brake activation.
If the stopping brake securing rod is in " locking " position, first valve rod of stopping brake valve is pulled to the left side, and at this moment, A chamber and B chamber are closed, and open in B chamber and G chamber, from the oil entering A chamber of drive pump and stop.The oil that flows to the brake piston hydraulic fluid port and form back pressure from the D chamber to the C chamber, B chamber and G chamber and be discharged.First valve rod of stopping brake valve still is pulled to left side and fixing.Make the live back pressure of device piston hydraulic fluid port of braking continue to descend, braking is applied fully and is kept this state.When even driving engine starts once more, also keep this state, promptly it utilizes the structure of valve self to eliminate the mistake walking action that bulldozer occurs after start.
The bulldozer brake activation valve that the utility model provides is installed between driving system pump and the brake plunger; When stepping on brake pedal or pull on the stopping brake control lever; Oil stream to brake piston is cut off; Under the effect of spring force, brake piston is shifted brake disc and friction lining together onto, and brake activation; When being used for stopping brake, cut off the oil stream that all gets into brake piston, apply the braking on left side and right side simultaneously.The utility model service brake and stopping brake are integrated in one, and piping layout is convenient, and volume is little, easy arrangement; Have service brake and parking brake function simultaneously, and can utilize the structure of valve self to eliminate the mistake walking action that bulldozer occurs after start.
Also can be provided with the F chamber that is communicated with the G chamber on the valve body 3 that the utility model provides, F chamber and exterior, the oil that flows to the brake piston hydraulic fluid port and form back pressure from the D chamber to the C chamber, B chamber, G chamber and F chamber and be discharged.
First valve rod is provided with and is respectively applied for the first piston that cuts off A chamber and B chamber, and is used to cut off second piston in B chamber and G chamber.Second valve rod is provided with and is respectively applied for the 3rd piston that cuts off C chamber and D chamber, and is used to cut off the 4th piston in D chamber and E chamber.Valve body 3 be provided with two respectively with first valve rod and the cooresponding plug screw 5 of second valve rod.
Second valve rod specifically comprises guide pin bushing 11, axle 9, spool 7 and plunger 8.Wherein, guide pin bushing 11 links to each other with brake pedal, and through moving axially of brake pedal control guide pin bushing 11, axle 9 is inserted in the guide pin bushing 11, and links to each other with this guide pin bushing 11, and in guide pin bushing 11 axially movable processes, axle 9 is followed mobile.Spool 7 is sheathed on the axle 9, and spool 7 is provided with the 3rd piston and the 4th piston.Plunger 8 is arranged in the spool 7, and these plunger 8 one ends offset the other end and spool 7 formation H chambeies with axle 9.Second return springs 6 is arranged between the plug screw 5 and spool 7 that is mounted on the valve body 3.The utility model also can comprise respectively the 3rd return springs 10 that links to each other with axle 9 with guide pin bushing 11.Preferably, first return springs 4, second return springs 6 and the 3rd return springs 10 are compression spring.
The utility model is when brake pedal during in the release position; Oil from drive pump gets into the A chamber through main by pass valve; Then through the B chamber, C chamber and D chamber flow to the back pressure hydraulic fluid port of the brake piston of left drg 30 and right drg 40 respectively through left drg hydraulic fluid port 31 and right drg hydraulic fluid port 41, promote the Piston Compression retarding spring with brake off.When stepping on brake pedal, second valve rod is pushed to the right side.At this moment, C chamber and D chamber are closed, and D chamber and E chamber are communicated with, and promptly return opening is opened, and stop from the oil entering A chamber of drive pump and in the C chamber this moment.The part oil that flows into brake plunger formation back pressure is discharged to the E chamber from the D chamber; Oil pressure is descended; The oil that gets into the H chamber promotes plunger 8, and the antagonistic force that promotes brake activation valve 7 to the right diminishes, so brake activation valve 7 is shifted to the left side by the tension force of pull back spring 6; Like this D chamber and E chamber are closed, oil pressure except that the D chamber is no longer further descended and remain unchanged.If step on brake pedal again, repeat aforesaid operations, when valve reaches its end of travel, with complete brake activation.
Each embodiment adopts the mode of going forward one by one to describe in this specification sheets, and what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the utility model.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined General Principle can realize under the situation of spirit that does not break away from the utility model or scope in other embodiments among this paper.Therefore, the utility model will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (8)
1. a bulldozer brake activation valve is characterized in that, comprises the service brake valve (2) and the stopping brake valve (1) that are integrated in the same valve body;
Be provided with first return springs (4) between first valve rod that links to each other with the stopping brake control lever of said stopping brake valve (1) and the said valve body (3); Said valve body (3) is provided with A chamber, B chamber and G chamber; Said A chamber communicates with said oil inlet (51), and when said A chamber and said B chamber were communicated with, ended in said B chamber and said G chamber; When ended in said A chamber and said B chamber, said B chamber and said G chamber were communicated with;
Be provided with second return springs (6) between second valve rod that links to each other with brake pedal of said service brake valve (2) and the said valve body (3); Said valve body (3) is provided with C chamber, D chamber and E chamber, and said B chamber communicates with said C chamber, and said D chamber communicates with the back pressure hydraulic fluid port of brake piston; When said C chamber and said D chamber are communicated with; End in said D chamber and said E chamber, and when ended in said C chamber and said D chamber, said D chamber and said E chamber were communicated with.
2. bulldozer brake activation valve as claimed in claim 1 is characterized in that, also is provided with the F chamber that is communicated with said G chamber on the said valve body (3).
3. bulldozer brake activation valve as claimed in claim 1 is characterized in that, said first valve rod is provided with and is respectively applied for the first piston that cuts off said A chamber and said B chamber, and is used to cut off second piston in said B chamber and said G chamber.
4. integral type bulldozer brake activation valve as claimed in claim 3 is characterized in that, said second valve rod is provided with and is respectively applied for the 3rd piston that cuts off said C chamber and said D chamber, and is used to cut off the 4th piston in said D chamber and said E chamber.
5. bulldozer brake activation valve as claimed in claim 4 is characterized in that, said second valve rod specifically comprises:
The guide pin bushing (11) that links to each other with said brake pedal;
Be inserted in the said guide pin bushing (11), and the axle (9) that links to each other with this guide pin bushing (11);
Be sheathed on the spool (7) on the said axle (9), said spool (7) is provided with said the 3rd piston and said the 4th piston;
Be arranged at the plunger (8) in the said spool (7), and these plunger (8) one ends offset the other end and said spool (7) formation H chamber with said axle (9).
6. integral type bulldozer brake activation valve as claimed in claim 5 is characterized in that, said second return springs (6) is arranged between the plug screw (5) and said spool (7) that is mounted on the said valve body (3).
7. integral type bulldozer brake activation valve as claimed in claim 6 is characterized in that, also comprises respectively the 3rd return springs (10) that links to each other with said axle (9) with said guide pin bushing (11).
8. like each described bulldozer brake activation valve of claim 1-7, it is characterized in that first return springs (4) and said second return springs (6) are compression spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120213209U CN202130443U (en) | 2011-06-22 | 2011-06-22 | Brake valve for bulldozer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120213209U CN202130443U (en) | 2011-06-22 | 2011-06-22 | Brake valve for bulldozer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202130443U true CN202130443U (en) | 2012-02-01 |
Family
ID=45519224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120213209U Expired - Fee Related CN202130443U (en) | 2011-06-22 | 2011-06-22 | Brake valve for bulldozer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202130443U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106246761A (en) * | 2016-08-31 | 2016-12-21 | 江西液压件股份有限公司 | A kind of two changements for steering cluth |
| CN110126800A (en) * | 2019-05-29 | 2019-08-16 | 安徽合力股份有限公司 | A kind of reversing control valve for truck electronic parking braking and unlocking function |
-
2011
- 2011-06-22 CN CN201120213209U patent/CN202130443U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106246761A (en) * | 2016-08-31 | 2016-12-21 | 江西液压件股份有限公司 | A kind of two changements for steering cluth |
| CN110126800A (en) * | 2019-05-29 | 2019-08-16 | 安徽合力股份有限公司 | A kind of reversing control valve for truck electronic parking braking and unlocking function |
| CN110126800B (en) * | 2019-05-29 | 2024-07-12 | 安徽合力股份有限公司 | Reversing control valve for forklift electronic parking braking and unlocking functions |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120201 Termination date: 20160622 |