CN101934789A - Hydraulic brake valve of full-hydraulic brake system in construction machinery - Google Patents
Hydraulic brake valve of full-hydraulic brake system in construction machinery Download PDFInfo
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- CN101934789A CN101934789A CN2010102800770A CN201010280077A CN101934789A CN 101934789 A CN101934789 A CN 101934789A CN 2010102800770 A CN2010102800770 A CN 2010102800770A CN 201010280077 A CN201010280077 A CN 201010280077A CN 101934789 A CN101934789 A CN 101934789A
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Abstract
The invention discloses a hydraulic brake valve of a full-hydraulic brake system in construction machinery, controlled by a brake pedal (8). The hydraulic brake valve and the brake pedal (8) are mounted on a bracket (3), the full-hydraulic brake system is provided with two hydraulic control oil paths which are respectively communicated with brake wheel cylinders of a front axle and a rear axle of a construction machinery vehicle, either hydraulic control oil path is provided with a three-position three-way change valve, and value cores of the two three-position three-way change valves are connected in series. The hydraulic brake valve is of a full-hydraulic brake system structure, has the technical parameters and performance indexes satisfying the design requirements of the hydraulic system, stable and reliable working state and good safe performance, improves the reliability of product sealing performance and improves the design and the performance of key core parts aiming at the internal structure of a traditional product so as to improve the sealing performance and the service life of the product.
Description
Technical field
The invention belongs to the technical field of construction machinery and equipment, relate to the full power hydraulic brake system of engineering machinery vehicle operation, more particularly, the present invention relates to a kind of hydraulic brake valve of construction machinery and equipment full power hydraulic brake system.
Background technology
In the prior art, the hydraulic brake valve of using on the engineering machinery vehicle (for example model is the hydraulic brake valve of SL01), its performance can not satisfy the requirement of engineering machinery hydraulic braking, the equal out of reach requirement of the reliability and stability of hydraulic packing performance.The upper and lower valve body inner bore of hydraulic brake valve and axle core fit dimension precision height (positiver sealing), the manufacturing difficulty of processing is big, the kernel component dynamic sealing performance that the pass is built has leakage phenomenon, does not satisfy the requirement of product hydraulic braking seal tests, causes the hydraulic brake system brake to lose efficacy.
Summary of the invention
Problem to be solved by this invention provides a kind of hydraulic brake valve of construction machinery and equipment full power hydraulic brake system, its objective is the all-hydraulic braking sealing performance that improves construction machinery and equipment, improves the reliability of all-hydraulic braking.
To achieve these goals, the technical scheme taked of the present invention is:
The hydraulic brake valve of construction machinery and equipment full power hydraulic brake system provided by the present invention, control by brake pedal, described hydraulic brake valve and brake pedal are installed on the support, described hydraulic brake system is provided with two hydraulic control oil circuits, respectively with engineering machinery vehicle on propons and the interface oil circuit of the brake wheel cylinder of back axle be communicated with, respectively be provided with a 3-position-3-way change-over valve in described two hydraulic control oil circuits, the spool of these two 3-position-3-way change-over valves is connected in series.
The oil inlet of described two 3-position-3-way change-over valves is communicated with two prefill valves respectively, the actuator port of described two 3-position-3-way change-over valves is communicated with the interface oil circuit of the brake wheel cylinder of the propons of engineering machinery vehicle and back axle respectively, and the return opening of described two 3-position-3-way change-over valves feeds petrol storage tank respectively; When brake pedal is in when depressing braking mode, the oil inlet of described two 3-position-3-way change-over valves is communicated with actuator port respectively.
Each is communicated with an energy storage oil inlet of described two 3-position-3-way change-over valves respectively.
The oil inlet of described 3-position-3-way change-over valve is communicated with guide's hydraulic efficiency pressure system.
Establish the power cut switch on the oil circuit of the brake wheel cylinder of described back axle, described power cut switch is communicated with the oil circuit of the brake wheel cylinder of described back axle, and described power cut switch is the oil liquid pressure master cock.
Make moving light switch on the oil circuit of the brake wheel cylinder of described propons, described stop lamp switch is communicated with the oil circuit of the brake wheel cylinder of described propons, and described stop lamp switch is the oil liquid pressure master cock.
The valve body material of described hydraulic brake valve adopts spheroidal graphite iron QT450-10.
Described hydraulic brake valve the processing technology in valve body master cylinder hole adopt thick finish turning, expand fraising, thick micro-honing, tumbling and polishing technology.
The present invention adopts technique scheme, is the full power hydraulic brake system structure, and its every technical parameter and performance figure have satisfied the designing requirement of construction machinery and equipment full power hydraulic brake system, and stable working state is reliable, and safety performance is good; Improved the reliability of hydraulic brake system sealing property, closed the kernel component of building at the inner structure of existing product and improve design, improved performance, thereby improve the braking sealing performance and the service life of product.
Description of drawings
Below expressed content of each width of cloth accompanying drawing of this specification sheets and the mark among the figure are made brief description:
Fig. 1 is a hydraulic brake valve systematic schematic diagram of the present invention;
Fig. 2 is the cross-sectional schematic of structure of the present invention;
Fig. 3 is the side schematic view of structure shown in Figure 2.
Be labeled as among the figure:
1, body assembly of lower valve, 2, the upper valve body assembly, 3, support, 4, bolt, 5, nut, 6, spring washer, 7,, bolt, 8, brake pedal, 9, the pedal turning cylinder, 10, split washer, 11, the roller turning cylinder, 12, roller, 13, screw.
The specific embodiment
Contrast accompanying drawing below, by description to embodiment, to effect and principle of work, the manufacturing process of the mutual alignment between the shape of the specific embodiment of the present invention such as related each member, structure, the each several part and annexation, each several part and manipulate method etc., be described in further detail, inventive concept of the present invention, technical scheme had more complete, accurate and deep understanding to help those skilled in the art.
As Fig. 1, Fig. 2 and the expressed structure of the present invention of Fig. 3, the present invention is a kind of hydraulic brake valve of construction machinery and equipment full power hydraulic brake system, and by brake pedal 8 controls, described hydraulic brake valve and brake pedal 8 are installed on the support 3.The hydraulic brake valve of construction machinery and equipment full power hydraulic brake system (SL01) is mainly used in the walking of fork truck, loader, road grader, excavating machine and handling machinery thereof, mining machinery, the directly moving brake system of the all-hydraulic dual circuit fluid power that stops, and its effect is a dominant project mechanical-hydraulic brake equipment.
In order to solve the problem that exists at the described present known technology of this specification sheets background technology part and to overcome its defective, realize the all-hydraulic braking of construction machinery and equipment, improve the goal of the invention of the reliability of braking, the technical scheme that the present invention takes is:
Be the hydraulic brake valve of construction machinery and equipment full power hydraulic brake system provided by the present invention as shown in Figure 1 in the long and two-short dash line frame, described hydraulic brake system is provided with two hydraulic control oil circuits, be communicated with the interface oil circuit of the brake wheel cylinder of the propons of engineering machinery vehicle and back axle respectively, respectively be provided with a 3-position-3-way change-over valve in described two hydraulic control oil circuits, the spool of these two 3-position-3-way change-over valves is connected in series.
As shown in Figure 2:
The spool of these two 3-position-3-way change-over valves is respectively upper and lower piston valve core, is installed in respectively in upper valve body assembly 2 and the body assembly of lower valve 1.
Bolt 4, nut 5, spring washer 6 play the position-limiting action of brake pedal 8 when brake off resets.
Between support 3 and the upper valve body assembly 2, be fastenedly connected by a plurality of bolts 7.
Brake pedal 8 rotates around pedal turning cylinder 9, and the axial location of split washer 10 restriction brake pedals 8 makes it can not move axially at pedal turning cylinder 9.
In order to reduce the wearing and tearing between brake pedal 8 and the spool push rod, adopt the structure of roller 12, roller 12 is installed by roller turning cylinder 11.
As shown in Figure 3, be fastenedly connected by screw 13 between upper valve body assembly 2 and the body assembly of lower valve 1.
As shown in Figure 2, when depressing brake pedal, upper piston moves down, the oil pressure in first chamber raises, simultaneously promote lower piston again and move down, the oil pressure in second chamber raises, and overcomes spring force, high pressure is braked the brake piping that fluid (first and second chamber) oil pressure flows into propons and back axle, and then the braking of front and back two wheel cylinders.When loosen the brake pedal 8 (brake off), upper and lower piston is got back to initial position under action of the spring, fluid in brake wheel cylinder and the pipeline, and the oil return pipe that flows back to hydraulic brake valve is got back to petrol storage tank.
The oil inlet of two 3-position-3-way change-over valves of the present invention (P1, P2) is communicated with the two chamber actuator ports (A11, A21) of a prefill valve respectively, the actuator port of described two 3-position-3-way change-over valves (A1, A2) respectively with engineering machinery vehicle on propons and the interface oil circuit of the brake wheel cylinder of back axle be communicated with, the return opening of described two 3-position-3-way change-over valves (T1, T2) feeds petrol storage tank respectively; When brake pedal 8 is in when depressing braking mode, the oil inlet of described two 3-position-3-way change-over valves (P1, P2) is communicated with actuator port (A1, A2) respectively.
The meta function of described two 3-position-3-way change-over valves is O type meta function, promptly is totally-enclosed hydraulic fluid port.At this moment, neither forward, the brake wheel cylinder of back axle provides braking fluid, simultaneously, brake wheel cylinder does not discharge hydraulic braking force yet.
This hydraulic brake valve flows into hydraulic brake valve and energy storage respectively by the stable constant oil mass of prefill valve output.When depressing brake pedal 8, hydraulic brake valve then can provide fluid to the front and rear wheel brake wheel cylinder, to implement braking.
(not fuel feeding liquid) is worked on by prefill valve when Hydraulic Pump or by pass valve operational failure, closes two two position two-way valves, by actuator port (A1, A2), makes energy storage (1.6L) oil pressure keep certain reservoir pressure (the fluid energy does not discharge).When depressing brake pedal 8, hydraulic brake valve works on, and forward, the wheel brake wheel cylinder of back axle provides fluid, to implement braking.
The oil inlet of two 3-position-3-way change-over valves of the present invention is communicated with an energy storage respectively.
The volume of energy storage is 1.6L.Prefill valve oil inlet (P1, P2) is communicated with Hydraulic Pump, by the Hydraulic Pump fuel feeding.Establish by pass valve on the Hydraulic Pump outlet oil circuit, set up system pressure.When the system oil hydraulic coupling was too high, by pass valve was opened draining.
The oil inlet of 3-position-3-way change-over valve of the present invention (P1) is communicated with guide's hydraulic efficiency pressure system.
The purpose that adopts guide's hydraulic efficiency pressure system is to make the braking and the state exchange of brake off realize pulsation-free transition more.
On the oil circuit of the brake wheel cylinder of back axle of the present invention, establish the power cut switch, described power cut switch is the oil liquid pressure master cock.
Because general back axle, is still worked for avoiding power system when carrying out glancing impact for driving, the power cut switch begins to play a role.
On the oil circuit of the brake wheel cylinder of propons of the present invention, make moving light switch, described stop lamp switch is the oil liquid pressure master cock.
Carrying out glancing impact, stop lamp switch is connected brake lamp, sends the signal of braking.
The upper and lower valve body material of hydraulic brake valve of the present invention adopts spheroidal graphite iron QT450-10.
In the prior art, the upper and lower valve body material of hydraulic brake valve is selected HT200 for use, the present invention selects the upper and lower valve body material of hydraulic brake valve for use spheroidal graphite iron (QT450-10), and purpose is to guarantee that the special construction of product and bore area have higher hardness and improve roughness of surface.
The processing technology in the upper and lower valve body master cylinder hole of hydraulic brake valve of the present invention adopts thick finish turning, expansion fraising, thick micro-honing, tumbling and polishing technology.
In the prior art, the design of the processing technology in the body master cylinder hole of hydraulic brake valve is unreasonable.The present invention improves design: mainly considers from the in-use performance of product, and the one, the stability of cylinder hole size tolerance is to guarantee hydraulic piston tension of engagement unanimity; The 2nd, the roughness of surface in cylinder hole is with the smoothness of guaranteeing hydraulic piston motion and the service life of product.Therefore adopt thick finish turning, expansion fraising, thick micro-honing, tumbling and polishing technology, guarantee that the hydraulic piston of product cooperates and sealing property with the motion in master cylinder hole.
(SL01 hydraulic brake valve) provided by the invention belongs to full power hydraulic brake system dual circuit hydraulic brake new structure, pass through verification experimental verification, finish the designing requirement that every technical parameter of attainment brake hydraulic pressure valve and performance have reached hydraulic brake system, the value of applying is arranged.
In conjunction with the accompanying drawings the present invention has been carried out exemplary description above; obviously specific implementation of the present invention is not subjected to the restriction of aforesaid way; as long as adopted the improvement of the various unsubstantialities that method of the present invention design and technical scheme carry out; or design of the present invention and technical scheme are directly applied to other occasion without improving, all within protection scope of the present invention.
Claims (8)
1. the hydraulic brake valve of a construction machinery and equipment full power hydraulic brake system, control by brake pedal (8), described hydraulic brake valve and brake pedal (8) are installed on the support (3), it is characterized in that: described hydraulic brake system is provided with two hydraulic control oil circuits, respectively with engineering machinery vehicle on propons and the brake wheel cylinder interface oil circuit of back axle be communicated with, respectively be provided with a 3-position-3-way change-over valve in described two hydraulic control oil circuits, the spool of these two 3-position-3-way change-over valves is connected in series.
2. according to the hydraulic brake valve of the described construction machinery and equipment full power hydraulic brake system of claim 1, it is characterized in that: the oil inlet of described two 3-position-3-way change-over valves all is communicated with the actuator port of prefill valve respectively, the actuator port of described two 3-position-3-way change-over valves is communicated with the interface oil circuit of the brake wheel cylinder of the propons of engineering machinery vehicle and back axle respectively, and the return opening of described two 3-position-3-way change-over valves feeds petrol storage tank respectively; When brake pedal (8) is in when depressing state, the oil inlet of described two 3-position-3-way change-over valves is communicated with actuator port respectively.
3. according to the hydraulic brake valve of the described construction machinery and equipment full power hydraulic brake system of claim 1, it is characterized in that: described brake system is established two energy storages, and the oil inlet of described two 3-position-3-way change-over valves is communicated with an energy storage respectively.
4. according to the hydraulic brake valve of the described construction machinery and equipment full power hydraulic brake system of claim 1, it is characterized in that: the oil inlet of described 3-position-3-way change-over valve is communicated with guide's hydraulic efficiency pressure system.
5. according to the hydraulic brake valve of the described construction machinery and equipment full power hydraulic brake system of claim 1, it is characterized in that: establish the power cut switch on the oil circuit of the brake wheel cylinder of described back axle, described power cut switch is communicated with the oil circuit of the brake wheel cylinder of described back axle, and described power cut switch is the oil liquid pressure master cock.
6. according to the hydraulic brake valve of the described construction machinery and equipment full power hydraulic brake system of claim 1, it is characterized in that: make moving light switch on the oil circuit of the brake wheel cylinder of described propons, described stop lamp switch is communicated with the oil circuit of the brake wheel cylinder of described propons, and described stop lamp switch is the oil liquid pressure master cock.
7. according to the hydraulic brake valve of the described construction machinery and equipment full power hydraulic brake system of claim 1, it is characterized in that: the valve body material of described hydraulic brake valve adopts spheroidal graphite iron QT450-10.
8. according to the hydraulic brake valve of the described construction machinery and equipment full power hydraulic brake system of claim 1, it is characterized in that: described hydraulic brake valve the processing technology in valve body master cylinder hole adopt thick finish turning, expand fraising, thick micro-honing, tumbling and polishing technology.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010280077 CN101934789B (en) | 2010-09-08 | 2010-09-08 | Hydraulic brake valve of full-hydraulic brake system in construction machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010280077 CN101934789B (en) | 2010-09-08 | 2010-09-08 | Hydraulic brake valve of full-hydraulic brake system in construction machinery |
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| Publication Number | Publication Date |
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| CN101934789A true CN101934789A (en) | 2011-01-05 |
| CN101934789B CN101934789B (en) | 2013-06-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201010280077 Active CN101934789B (en) | 2010-09-08 | 2010-09-08 | Hydraulic brake valve of full-hydraulic brake system in construction machinery |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102514564A (en) * | 2012-01-04 | 2012-06-27 | 江苏柳工机械有限公司 | Power cut-off electric control system for unilateral driving brake of engineering vehicle |
| CN106627541A (en) * | 2016-09-30 | 2017-05-10 | 三环集团有限公司 | Automobile active hydraulic braking system |
| CN108674402A (en) * | 2018-05-23 | 2018-10-19 | 浙江海宏液压科技股份有限公司 | A kind of all-hydraulic plugging clutch system |
| CN108891398A (en) * | 2018-06-14 | 2018-11-27 | 杭叉集团股份有限公司 | Hydraulic valve block for brake system of forklift |
| CN108891397A (en) * | 2018-06-14 | 2018-11-27 | 杭叉集团股份有限公司 | Electri forklift full power hydraulic brake system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102514564A (en) * | 2012-01-04 | 2012-06-27 | 江苏柳工机械有限公司 | Power cut-off electric control system for unilateral driving brake of engineering vehicle |
| CN106627541A (en) * | 2016-09-30 | 2017-05-10 | 三环集团有限公司 | Automobile active hydraulic braking system |
| CN108674402A (en) * | 2018-05-23 | 2018-10-19 | 浙江海宏液压科技股份有限公司 | A kind of all-hydraulic plugging clutch system |
| CN108891398A (en) * | 2018-06-14 | 2018-11-27 | 杭叉集团股份有限公司 | Hydraulic valve block for brake system of forklift |
| CN108891397A (en) * | 2018-06-14 | 2018-11-27 | 杭叉集团股份有限公司 | Electri forklift full power hydraulic brake system |
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| Publication number | Publication date |
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| CN101934789B (en) | 2013-06-12 |
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Owner name: WUHU SHENGLI TECHNOLOGY CO., LTD Free format text: FORMER NAME: SHENGLI BRAKE CO., LTD., WUHU |
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Address after: 241003 No. 17 West Mountain Road, hi tech Industrial Development Zone, Anhui, Wuhu Patentee after: Wuhu Shengli Technology Shares Co., Ltd. Address before: 241003 No. 8, Jinshan Road, hi tech Industrial Development Zone, Yijiang District, Anhui, Wuhu Patentee before: Shengli Brake Co., Ltd., Wuhu |
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