CN203032655U - Hydraulic brake master cylinder of agricultural harvester - Google Patents
Hydraulic brake master cylinder of agricultural harvester Download PDFInfo
- Publication number
- CN203032655U CN203032655U CN 201220613252 CN201220613252U CN203032655U CN 203032655 U CN203032655 U CN 203032655U CN 201220613252 CN201220613252 CN 201220613252 CN 201220613252 U CN201220613252 U CN 201220613252U CN 203032655 U CN203032655 U CN 203032655U
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- piston
- master cylinder
- pump housing
- bowl
- agricultural
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Abstract
The utility model discloses a hydraulic brake master cylinder of an agricultural harvester, the hydraulic brake master cylinder of the agricultural harvester comprises a cylinder body, an inner cavity and an oil output path communicated with the front end of the inner cavity are arranged inside the cylinder body, a piston is arranged inside the inner cavity, a return spring is arranged at the top of the piston and abuts against the front end of the inner cavity of the cylinder body, an elastic primary bowl is arranged at a front protrusion of the outer side of the front portion of the piston, an elastic auxiliary bowl is arranged at a rear protrusion of the rear side of the rear portion of the piston, and a groove connecting a push rod assembly is arranged at the tail portion of the piston. The inner cavity of the cylinder body is of an irregular-shaped two-step hole structure with different calibers, wherein a front side matched with the piston primary bowl is small in caliber, and a rear side matched with the piston auxiliary bowl is large in caliber. The hydraulic brake master cylinder of the agricultural harvester is capable of improving oil supply amount when the master cylinder brakes, and has the advantages that a pedal of the hydraulic brake master cylinder of the agricultural harvester is effort-saving, small in route, and flexible in braking.
Description
Technical field
The utility model relates to the agricultural vehicle brake equipment, is specially a kind of agricultural cropper hydraulic braking master cylinder.
Background technology
At present, the structure of the cropper hydraulic braking master cylinder on the market as shown in Figure 1, under nominal situation, the piston 2 of the pump housing 1 ' interior ' be positioned at right side, when needs are braked, chaufeur is stepped on stretcher, drive push rod assembly 3 ' move to left, and then promotion piston 2 ' move left along pump housing inner chamber 11 ' court, make pump chamber inner chamber 11 ' and the total bowl 21 of piston 2 ' front end ' between volume dwindle and oil pressure raise rapidly, hydraulic oil is from the oil circuit 12 of the pump housing 1 ' front end ' by copper mouth 121 ' enter caliper and wheel cylinder, promote the clamp piston and make brake plate hold brake disc tightly, promote wheelcylinder piston simultaneously and release brake shoe brake cheek, lean on brake wheel, the obstruction front and back wheel is rotated, and reaches braking effect.
At this, because of the amplitude of fluctuation in the above brake disc braking procedure in 3 millimeter, if will realize effective braking, it is additional that master cylinder needs enough oil masses to supply with, and because of the pump housing inner chamber 11 of existing structure ' be with the bore setting, the main bowl 21 of piston 2 ' front end ' fuel feeding is worked only, the secondary bowl 22 of piston rear end ' inoperative substantially to fuel feeding, in practice by increase pump housing inner chamber 11 ' internal diameter realize.And the increase of pump housing inner chamber 11 ' internal diameter will cause the problem such as stroke increase, treadle effort increasing of brake pedal.
For addressing this problem, existing method be pump housing inner chamber 11 ' front end and oil circuit 12 ' inflow point be provided with one be positioned at piston 2 ' retracing spring 4 ' front end residual valve 5 ', when stopping braking during piston 4 ' retraction, in case oil circuit 12 ' in oil pressure be not enough to overcome retracing spring 4 ' restoring force, residual valve 5 ' the backflow of oil circuit 12 ' middle hydraulic oil will be ended, thereby after making that braking stops, oil circuit 12 ' in still keep certain residual pressure, this pressure makes the gap smaller between brake plate and the brake disc, the oil mass that such structure is arranged on when having reduced effective the braking is to a great extent supplied with, but the gap between brake plate and the brake disc is very few, can in use come in contact friction again, and friction will make the very high temperature of generation between the two, produces breakneck potential safety hazard, as brake failure etc.
The utility model content
At the problems referred to above, the utility model has designed a kind of agricultural cropper hydraulic braking master cylinder, and it has, and pedal is laborsaving, pedal stroke is little, the drag sensitive characteristics.
For achieving the above object, the utility model is by the following technical solutions:
A kind of agricultural cropper hydraulic braking master cylinder, comprise a pump housing, be provided with inner chamber and a vent line that is communicated with the inner chamber front end in the pump housing, in the described inner chamber piston is installed, described piston head is provided with a pull back spring and pump housing inner chamber front end offsets, projection is installed an elasticity master bowl before the anterior arranged outside of piston, the piston rear outside is provided with the back projection the secondary bowl of elasticity is installed, piston tail is provided with groove and connects push rod assembly, it is characterized in that: described pump housing inner chamber is one to be the abnormity two ladder pore structures of different bores, wherein the aperture, front side that cooperates with piston master bowl is less, and the back lateral aperture that cooperates with the piston pair wrist is bigger.
Further, above-mentioned elasticity master's bowl is divided into front chamber and rear chamber to pump housing inner chamber.
Further, be provided with some intercommunicating pores in the preceding projection of above-mentioned location elasticity master bowl.
Further, the above-mentioned pump housing is provided with oil inlet pipe union, and oil inlet pipe union is communicated with described front chamber under the initial condition by a ramuscule oil circuit through the working connection on the valve body, and working connection props up an oil circuit greatly by one and is communicated with described rear chamber.
Further, be provided with one in the working connection in the above-mentioned pump housing and fill valve soon, the whole valve that fills soon comprises a body; Body is provided with one and is positioned at the main fuel feed hole at center and the inferior fuel feed hole around some being positioned at; The upper inlet of described main fuel feed hole is inverted cone-shaped structure and a ball valve core is installed therein that the ball valve core is pressed on the back taper mouth it by a mesh plate is spacing; Described mesh plate is positioned on the body by a top board with a plurality of through holes; The following outlet of described fuel feed hole is sealed by a rubber seal and is formed one-way valve structures.
Further, the above-mentioned valve that fills soon is arranged in the working connection by back-up ring location.
Further, the junction of the above-mentioned pump housing and push rod assembly is provided with dust boot.
In use, when chaufeur is stepped on brake pedal, piston begins to move forward and further compression retracteding position spring, this moment front chamber's volume reducing of chamber body and pressure increases, and by vent line towards sending oil outside, and meanwhile, because of pump housing inner chamber rear portion internal diameter bigger than anterior, along with the reach of piston, rear chamber's volume reduces and the pressure increase simultaneously.At this, because can effluxing by vent line, front chamber obtains certain pressure release, and the pressure of rear chamber is increasing always, thereby chamber produces difference of pressure before and after making, when piston continues reach, this difference of pressure will make and back down elasticity master bowl, make be hydraulic oil in the rear chamber in preceding projection intercommunicating pore and flow through main bowl around enter front chamber, like this, further increased the delivery quality of front chamber, thereby further strengthened the operation pressure in the front chamber, and pressure has increased, pedal stroke also just can correspondingly be reduced.
Above working process is along with the continuation reach of piston, rear chamber is front chamber's fuel feeding always, this process is until a specific setting pressure, the pressure of chamber equates before and after this moment, at this moment, the ball valve core that fills soon in the main fuel feed hole in the valve is backed down by the hydraulic oil in the rear chamber, and the hydraulic oil in the rear chamber flow back into lubricating cup by working connection.
And when loosen the brake, pull back spring forces piston to return, front chamber's formation this moment negative pressure makes vent line carry out oil return, rear chamber also forms negative pressure simultaneously, this negative pressure makes the ball valve core in the main oil inlet that fills valve soon fall after rise on the one hand and closes, open the rubber seal that fills valve time fuel feed hole bottom soon simultaneously, make hydraulic oil be full of rear chamber fast from lubricating cup, this process is until piston is got back to initial position.
To sum up, big oil mass when the utility model master cylinder has been realized braking supply with and stop to brake after quick oil return, can effectively alleviate treadle effort and reduce pedal stroke, make braking sensitive, the utility model has been removed the structure of residual valve simultaneously, the pressure of having eliminated after braking stops is residual, has guaranteed the active distance between brake plate and the brake disc, has stopped because of both fricative potential safety hazards.
Description of drawings
The structural representation of Fig. 1, existing hydraulic braking master cylinder;
Fig. 2, structural representation of the present utility model;
Fig. 3, the utility model fill the structural representation of valve soon.
The specific embodiment
As shown in Figure 2, a kind of agricultural cropper hydraulic braking master cylinder comprises a pump housing 1, is provided with inner chamber 11 and a vent line 12 that is communicated with inner chamber 11 front ends in the pump housing 1, be provided with the annunciator 121 for the oil circuit oil starvation in the vent line 12, vent line 12 outlets connect a bronze medal mouth 122.
Described pump housing inner chamber 11 is one to be the abnormity two ladder pore structures of different bores, and wherein the aperture, front side that cooperates with piston master bowl 23 is less, and the back lateral aperture that cooperates with piston pair wrist 25 is bigger.Described elastic piston master bowl 23 is divided into front chamber 111 and rear chamber 112 to pump housing inner chamber 11, simultaneously location elasticity master bowl 23 preceding protruding 22 in be provided with some intercommunicating pores 221.
Also be provided with oil inlet pipe union 4 on the described pump housing 1, oil inlet pipe union 4 is communicated with described front chamber 111 under the initial condition by a ramuscule oil circuit 131 through the working connection 13 on the valve body 1, and working connection 13 props up an oil circuit 132 greatly by one and is communicated with described rear chamber 112.
For realizing the quick oil return of master cylinder after braking stops, being provided with one by a back-up ring 5 in the working connection 13 in the described pump housing 1 and filling valve 6 soon.In the present embodiment, as shown in Figure 3, the whole valve 6 that fills soon comprises a body 61, and body 61 is provided with one and is positioned at the main fuel feed hole 611 at center and the inferior fuel feed hole 612 around some being positioned at.The upper inlet of described main fuel feed hole 611 is inverted cone-shaped structure and a ball valve core 613 is installed therein, ball valve core 613 is pressed on the back taper mouth it by a mesh plate 614 is spacing, and described mesh plate 614 is positioned on the body 61 by a top board 615 with a plurality of through holes.The following outlet of described fuel feed hole 612 is sealed by a rubber seal 616 and is formed one-way valve structures.
In addition, for guaranteeing the cleaning of the pump housing 1 inner chamber, the described pump housing 1 is provided with dust boot 8 with the junction of push rod assembly 7.
In use, when chaufeur is stepped on brake pedal, piston 2 begins to move forward and further compression retracteding position spring 3, this moment front chamber's 11 volume reducing of chamber body 11 and pressure increases, and by vent line 12 towards sending oil outside, and meanwhile, because of pump housing inner chamber 11 rear portion internal diameters bigger than anterior, along with the reach of piston 2, rear chamber's 112 volumes reduce and the pressure increase simultaneously.At this, because can effluxing by vent line 12, front chamber 111 obtains certain pressure release, and the pressure of rear chamber 112 is increasing always, thereby chamber produces difference of pressure before and after making, when piston 2 continues reach, this difference of pressure will make and back down elasticity master bowl 23, make be hydraulic oil in the rear chamber 112 in preceding protruding 22 intercommunicating pore 221 and flow through main bowl 23 around enter front chamber 111, like this, further increased the delivery quality of front chamber 111, thereby further strengthened the operation pressure in the front chamber 111, and pressure has increased, pedal stroke also just can correspondingly be reduced.
Above working process is along with the continuation reach of piston 2 is keeping rear chamber 112 to be front chamber's 111 fuel feeding always, this process is until a specific setting pressure, the pressure of chamber equates before and after this moment, at this moment, the ball valve core 613 that fills soon in the main fuel feed hole 611 in the valve 6 is backed down by the hydraulic oil in the rear chamber 112, and the hydraulic oil in the rear chamber 112 flow back into lubricating cup by working connection 13.
And when loosen the brake, pull back spring 3 forces piston 2 to return, this moment, front chamber's 111 formation negative pressure made vent line 12 carry out oil return, rear chamber 112 also forms negative pressure simultaneously, this negative pressure makes the ball valve core 613 in the main oil inlet 611 that fills valve 6 soon fall after rise on the one hand and closes, open the rubber seal 616 that fills valve time fuel feed hole 612 bottoms soon simultaneously, make hydraulic oil be full of rear chamber 112 fast from lubricating cup, this process is until piston 2 is got back to initial position.
To sum up, the big oil mass of vent line when the utility model master cylinder has been realized braking supply with and stop to brake after quick oil return, can effectively alleviate treadle effort and reduce pedal stroke, make braking sensitive, the utility model has been removed the structure of residual valve simultaneously, the pressure of having eliminated after braking stops is residual, has guaranteed the active distance between brake plate and the brake disc, has stopped because of both fricative potential safety hazards.
The above, it only is preferred embodiments of the present utility model, be not that the utility model is done any pro forma restriction, every foundation know-why of the present utility model still belongs in the scope of technical solutions of the utility model any simple modification, equivalent variations or modification that above embodiment does.
Claims (7)
1. agricultural cropper hydraulic braking master cylinder, comprise a pump housing, be provided with inner chamber and a vent line that is communicated with the inner chamber front end in the pump housing, in the described inner chamber piston is installed, described piston head is provided with a pull back spring and pump housing inner chamber front end offsets, projection is installed an elasticity master bowl before the anterior arranged outside of piston, the piston rear outside is provided with the back projection the secondary bowl of elasticity is installed, piston tail is provided with groove and connects push rod assembly, it is characterized in that: described pump housing inner chamber is one to be the abnormity two ladder pore structures of different bores, wherein the aperture, front side that cooperates with piston master bowl is less, and the back lateral aperture that cooperates with the piston pair wrist is bigger.
2. a kind of agricultural cropper hydraulic braking master cylinder as claimed in claim 1, it is characterized in that: described elasticity master's bowl is divided into front chamber and rear chamber to pump housing inner chamber.
3. a kind of agricultural cropper hydraulic braking master cylinder as claimed in claim 2 is characterized in that: be provided with some intercommunicating pores in the preceding projection of described location elasticity master bowl.
4. as the described a kind of agricultural cropper hydraulic braking master cylinder of the arbitrary claim of claim 1-3, it is characterized in that: the described pump housing is provided with oil inlet pipe union, oil inlet pipe union is communicated with described front chamber under the initial condition by a ramuscule oil circuit through the working connection on the valve body, and working connection props up an oil circuit greatly by one and is communicated with described rear chamber.
5. a kind of agricultural cropper hydraulic braking master cylinder as claimed in claim 4, it is characterized in that: be provided with one in the working connection in the described pump housing and fill valve soon, the whole valve that fills soon comprises a body; Body is provided with one and is positioned at the main fuel feed hole at center and the inferior fuel feed hole around some being positioned at; The upper inlet of described main fuel feed hole is inverted cone-shaped structure and a ball valve core is installed therein that the ball valve core is pressed on the back taper mouth it by a mesh plate is spacing; Described mesh plate is positioned on the body by a top board with a plurality of through holes; The following outlet of described fuel feed hole is sealed by a rubber seal and is formed one-way valve structures.
6. a kind of agricultural cropper hydraulic braking master cylinder as claimed in claim 5 is characterized in that: the described valve that fills soon is arranged in the working connection by back-up ring location.
7. a kind of agricultural cropper hydraulic braking master cylinder as claimed in claim 1, it is characterized in that: the junction of the described pump housing and push rod assembly is provided with dust boot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220613252 CN203032655U (en) | 2012-11-20 | 2012-11-20 | Hydraulic brake master cylinder of agricultural harvester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220613252 CN203032655U (en) | 2012-11-20 | 2012-11-20 | Hydraulic brake master cylinder of agricultural harvester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203032655U true CN203032655U (en) | 2013-07-03 |
Family
ID=48684796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220613252 Expired - Lifetime CN203032655U (en) | 2012-11-20 | 2012-11-20 | Hydraulic brake master cylinder of agricultural harvester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203032655U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104149761A (en) * | 2014-07-19 | 2014-11-19 | 芜湖恒坤汽车部件有限公司 | Brake master pump with built-in one-way valve |
| CN104176030A (en) * | 2014-07-19 | 2014-12-03 | 芜湖恒坤汽车部件有限公司 | Pump body assembly for automobile braking |
| CN109435925A (en) * | 2018-12-28 | 2019-03-08 | 芜湖稳乐制动系统有限公司 | A kind of master cylinder |
-
2012
- 2012-11-20 CN CN 201220613252 patent/CN203032655U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104149761A (en) * | 2014-07-19 | 2014-11-19 | 芜湖恒坤汽车部件有限公司 | Brake master pump with built-in one-way valve |
| CN104176030A (en) * | 2014-07-19 | 2014-12-03 | 芜湖恒坤汽车部件有限公司 | Pump body assembly for automobile braking |
| CN109435925A (en) * | 2018-12-28 | 2019-03-08 | 芜湖稳乐制动系统有限公司 | A kind of master cylinder |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130703 |
|
| CX01 | Expiry of patent term |