CN113682289B - Support vehicle braking system and support vehicle - Google Patents
Support vehicle braking system and support vehicle Download PDFInfo
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- CN113682289B CN113682289B CN202111145252.XA CN202111145252A CN113682289B CN 113682289 B CN113682289 B CN 113682289B CN 202111145252 A CN202111145252 A CN 202111145252A CN 113682289 B CN113682289 B CN 113682289B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/12—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid
- B60T13/14—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid using accumulators or reservoirs fed by pumps
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T15/00—Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T15/00—Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00
- B60T15/02—Application and release valves
- B60T15/04—Driver's valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M1/00—Pressure lubrication
- F01M1/18—Indicating or safety devices
- F01M1/20—Indicating or safety devices concerning lubricant pressure
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- General Engineering & Computer Science (AREA)
- Braking Systems And Boosters (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
本发明提供一种支架车制动系统及支架车，该系统包括与马达连通的闭式泵、档位手柄阀、与蓄能器油源连通的踏板阀和驻车制动装置，闭式泵的输入端与档位手柄阀的输出端连通；踏板阀包括踏板阀体、第一踏板控制阀、以及第二踏板控制阀，第一踏板控制阀的输入端与蓄能器油源连通，第一踏板控制阀的输出端与减速机连通，第二踏板控制阀的输入端与蓄能器油源连通，第二踏板控制阀的输出端与档位手柄阀的输入端连通；驻车制动装置包括与储气罐连通的驻车制动开关、以及与制动泵连通的驻车制动阀组件，驻车制动开关的输出端与驻车制动阀组件的输入端连通，驻车制动阀组件的输出端分别与减速机和档位手柄阀的输入端连通。本发明，可提高安全性和可靠性。
The invention provides a bracket car braking system and a bracket car. The system includes a closed pump communicated with a motor, a gear handle valve, a pedal valve communicated with an accumulator oil source, and a parking brake device. The closed pump The input end of the pedal is communicated with the output end of the gear handle valve; the pedal valve includes a pedal valve body, a first pedal control valve, and a second pedal control valve, the input end of the first pedal control valve is communicated with the accumulator oil source, and the first pedal control valve The output end of a pedal control valve is communicated with the reducer, the input end of the second pedal control valve is communicated with the accumulator oil source, the output end of the second pedal control valve is communicated with the input end of the gear handle valve; the parking brake The device includes a parking brake switch communicated with the air storage tank, and a parking brake valve assembly communicated with the brake pump. The output end of the parking brake switch is communicated with the input end of the parking brake valve assembly, and the parking brake The output end of the brake valve assembly is respectively communicated with the input end of the speed reducer and the gear handle valve. The present invention can improve safety and reliability.
Description
Technical Field
The invention relates to the technical field of coal mine mechanical equipment, in particular to a support vehicle braking system and a support vehicle.
Background
The support vehicle is a device for carrying a hydraulic support of a fully mechanized mining face of a coal mine, belongs to mining equipment, and is a novel special vehicle or a special carrying tool which is developed, designed and manufactured specially for the transportation or long-distance transportation of the hydraulic support in the process of moving and reversing the fully mechanized mining face. At present, the following two brake systems are adopted on the existing large-scale heavy engineering equipment such as a support vehicle and the like: 1) the hydraulic braking system provides high-pressure oil for the brake through components such as a brake pedal valve, a liquid charging valve, an energy accumulator and the like to perform service braking; 2) the parking brake system generally adopts a spring brake and pressure release brake mode. However, the service brake and the parking brake in the existing support vehicle brake system are independently controlled, mutual interference is easily caused, and the safety and the reliability are low. Meanwhile, the existing service brake and parking brake are irrelevant to the control of a vehicle door and the control of an engine, so that potential safety hazards are further caused, and the safety is low.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a support vehicle braking system and a support vehicle, which avoid mutual interference and improve safety and reliability by combining service braking, parking braking and hydrostatic braking.
The technical scheme of the invention provides a brake system of a support vehicle, which comprises a closed pump, a gear handle valve, a pedal valve and a parking brake device, wherein the closed pump is communicated with a motor, the pedal valve is communicated with an energy accumulator oil source, and the input end of the closed pump is communicated with the output end of the gear handle valve;
the pedal valve comprises a pedal valve body, a first pedal control valve connected with a first end of the pedal valve body and a second pedal control valve connected with a second end of the pedal valve body, wherein the input end of the first pedal control valve is communicated with the energy accumulator oil source, the output end of the first pedal control valve is communicated with the speed reducer, the input end of the second pedal control valve is communicated with the energy accumulator oil source, and the output end of the second pedal control valve is communicated with the input end of the gear handle valve;
the parking brake device comprises a parking brake switch communicated with the gas storage tank and a parking brake valve assembly communicated with the brake pump, the output end of the parking brake switch is communicated with the input end of the parking brake valve assembly, and the output end of the parking brake valve assembly is communicated with the input end of the speed reducer and the input end of the gear handle valve respectively.
Furthermore, the parking brake valve assembly comprises a reversing valve and a sequence valve, wherein the input end of the reversing valve is communicated with the parking brake switch, the output end of the reversing valve is communicated with the input end of the sequence valve, and the output end of the sequence valve is communicated with the input end of the gear handle valve.
Further, the parking brake valve assembly further comprises a first one-way valve communicated with the brake pump, and an output end of the first one-way valve is communicated with the reversing valve.
Furthermore, parking brake device still includes the lock control valve of being connected with the door, the input of lock control valve with the gas holder intercommunication, the output of lock control valve with parking brake switch's input intercommunication.
Furthermore, the parking brake device further comprises an engine oil pressure control valve connected with the engine, the input end of the engine oil pressure control valve is communicated with the output end of the door lock control valve, and the output end of the engine oil pressure control valve is communicated with the input end of the parking brake switch.
Furthermore, the parking brake device further comprises a shuttle valve and a manual parking releasing assembly communicated with the hydraulic oil tank, the input end of the shuttle valve is communicated with the parking brake valve assembly and the manual parking releasing assembly respectively, the output end of the shuttle valve is communicated with the speed reducer, and the parking brake valve assembly is connected with the manual parking releasing assembly in parallel.
Further, the shuttle valve includes a first control port, a second control port, and a third control port in communication with the speed reducer, one end of the second control port is in communication with an output of the parking brake valve assembly, the other end of the second control port is in communication with the first control port, one end of the third control port is in communication with an output of the manual park release assembly, and the other end of the third control port is in communication with the first control port.
Furthermore, manual release parking subassembly includes the pump body and second check valve, the input of the pump body with hydraulic tank intercommunication, the output of the pump body with the input intercommunication of second check valve, the output of second check valve with third control port intercommunication.
Furthermore, the manual parking releasing assembly further comprises a throttle valve, one end of the throttle valve is communicated with the input end of the pump body, and the other end of the throttle valve is communicated with the output end of the second one-way valve.
The technical scheme of the invention also provides a support vehicle which comprises the support vehicle braking system.
After adopting above-mentioned technical scheme, have following beneficial effect:
(1) by combining the service brake, the parking brake and the hydrostatic brake, mutual interference is avoided, and the safety and the reliability are improved.
(2) The parking brake device and the gear control of the gear handle valve form interlocking control, when the parking of the vehicle is not released, the gear switching function of the vehicle is failed, and the safety is further improved.
(3) The door lock control valve and the engine oil pressure control valve form interlocking control with the vehicle door and the engine oil pressure, and the parking can not be released under the conditions that the vehicle door is not closed and the engine oil pressure is low, so that the operation safety is further improved, and the engine is protected.
Drawings
The disclosure of the present invention will become more readily understood by reference to the drawings. It should be understood that: these drawings are for illustrative purposes only and are not intended to limit the scope of the present disclosure. In the figure:
fig. 1 is a schematic structural diagram of a support vehicle braking system according to an embodiment of the present invention.
Reference symbol comparison table:
11-a motor; 12-a closed pump; 13-shift handle valve; 14-a pedal valve; 141-pedal valve body; 142-a first foot pedal control valve; 143-a second pedal controlled valve; 15-parking brake means; 151-parking brake switch; 152-a parking brake valve assembly; 1521-a reversing valve; 1522-sequence valve; 1523-first one-way valve; 153-door lock control valve; 154-oil pressure control valve; 155-parking accumulator; 156-a shuttle valve; a-a first control port; b-a second control port; c-a third control port; 157-manual release of the parking assembly; 1571-pump body; 1572-a second one-way valve; 1573-manual accumulator; 1574-throttle valve; 16-a speed reducer; and 17-vehicle wheels.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings.
It is easily understood that according to the technical solution of the present invention, those skilled in the art can substitute various structures and implementation manners without changing the spirit of the present invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical aspects of the present invention, and should not be construed as limiting or restricting the technical aspects of the present invention.
The terms of orientation of up, down, left, right, front, back, top, bottom, and the like referred to or may be referred to in this specification are defined relative to the configuration shown in the drawings, and are relative terms, and thus may be changed correspondingly according to the position and the use state of the device. Therefore, these and other directional terms should not be construed as limiting terms.
As shown in fig. 1, fig. 1 is a schematic structural diagram of a braking system of a rack truck according to an embodiment of the present invention, and includes a closed pump 12 communicated with a motor 11, a shift handle valve 13, a pedal valve 14 communicated with an energy accumulator oil source, and a parking brake device 15, where an input end of the closed pump 12 is communicated with an output end of the shift handle valve 13;
the pedal valve 14 comprises a pedal valve body 141, a first pedal control valve 142 connected with a first end of the pedal valve body 141, and a second pedal control valve 143 connected with a second end of the pedal valve body 141, an input end of the first pedal control valve 142 is communicated with the energy accumulator oil source, an output end of the first pedal control valve 142 is communicated with the speed reducer 16, an input end of the second pedal control valve 143 is communicated with the energy accumulator oil source, and an output end of the second pedal control valve 143 is communicated with an input end of the shift handle valve 13;
the parking brake device 15 comprises a parking brake switch 151 communicated with a gas storage tank and a parking brake valve assembly 152 communicated with a brake pump, wherein the output end of the parking brake switch 151 is communicated with the input end of the parking brake valve assembly 152, and the output end of the parking brake valve assembly 152 is respectively communicated with the input ends of the speed reducer 16 and the gear handle valve 13.
The brake system of the support vehicle mainly comprises a closed pump 12, a gear handle valve 13, a pedal valve 14 and a parking brake device 15.
The pedal valve 14 includes a pedal valve body 141, a first pedal control valve 142 and a second pedal control valve 143, the first pedal control valve 142 is disposed at a first end of the pedal valve body 141, the second pedal control valve 143 is disposed at a second end of the pedal valve body 142, the first end and the second end of the pedal valve body 141 are opposite ends, specifically, the first end is an upper end of the pedal valve body 141, and the second end is a lower end of the pedal valve body 141. The first pedal control valve 142, the energy storage oil source and the speed reducer 16 form a service braking system, and when the pedal valve body 141 is stepped on, high-pressure oil passes through the first pedal control valve 142 from the energy storage oil source and reaches a braking cavity of the speed reducer 16, so that the wheels 17 are braked.
The input end of the gear handle valve 13 is communicated with the output end of the second pedal control valve 142, the output end of the gear handle valve 13 is communicated with the input end of the closed pump 12, the output end of the closed pump 12 is communicated with the motor 11, the closed pump 12 controls the pump displacement cavity variable through the gear handle valve 13, and high-pressure oil is output to the motor 11 from an AB port of the closed pump 12, so that the wheels 17 are driven to rotate. The second pedal control valve 142, the shift handle valve 13, and the closed pump 12 form a hydrostatic brake system. In the running process of the vehicle, at the initial stage of stepping on the pedal valve 14, the second pedal control valve 142 acts first, the pressure of the input port P of the gear handle valve 13 is relieved from the second pedal control valve 142, the pressure of the output ports A and B of the gear handle valve 13 is relieved, then the displacement control ports Y1 and Y2 of the closed pump 12 return to the neutral position, the closed pump 12 returns to the zero displacement position, namely the closed pump 12 does not output oil to the motor 11 any more, the high-low pressure cavity of the motor 11 is reversed, hydrostatic braking force is generated, and the vehicle starts to brake.
The parking brake device 15 includes a parking brake switch 151 and a parking brake valve assembly 152. The input end of the parking brake switch 151 is communicated with the air storage tank, so that the control mode of the parking brake device 15 adopts pneumatic control, the output end of the parking brake switch 151 is communicated with the input end of the parking brake valve assembly 152, the output end of the parking brake valve assembly 152 is respectively communicated with the speed reducer 16 and the gear handle valve 13, and the opening or closing of the parking brake switch 151 is controlled through the air pressure of the air storage tank, so that the communication or disconnection of the parking brake valve assembly 152 and the speed reducer 16 is controlled. When the parking brake switch 151 is turned off, the parking brake valve assembly 152 is disconnected from the speed reducer 16, and the parking brake valve assembly 152 cannot convey high-pressure oil in a brake pump into a parking brake cavity of the speed reducer 16, so that parking brake is realized; when the parking brake switch 151 is turned on, the parking brake valve assembly 152 communicates with the speed reducer 16, and the parking brake valve assembly 152 delivers high-pressure oil in the brake pump into a parking brake chamber of the speed reducer 16 to release the parking brake.
According to the support vehicle braking system, the service braking, the parking braking and the hydrostatic braking are combined through the closed pump, the gear handle valve, the pedal valve and the parking braking device, mutual interference is avoided, and safety and reliability are improved. Meanwhile, the parking brake device and the gear control of the gear handle valve form interlocking control, when the parking of the vehicle is not released, the gear switching function of the vehicle is disabled, and the safety is further improved.
In one embodiment, the parking brake valve assembly 152 includes a direction valve 1521 and a sequence valve 1522, an input of the direction valve 1521 is communicated with the parking brake switch 153, an output of the direction valve 1521 is communicated with an input of the sequence valve 1522, and an output of the sequence valve 1522 is communicated with an input of the shift handle valve 13.
When the vehicle parking brake is not released, the rear end of the reversing valve 1521 has no pressure, the sequence valve 1522 does not reverse, the port G2 of the parking brake valve assembly 152 has no pressure, the port P of the gear handle valve 13 has no high pressure, the ports A and B of the gear handle valve 13 have no high pressure, the displacement control ports Y1 and Y2 of the closed pump 12 have no pressure, the closed pump 12 cannot variably output hydraulic oil, the sequence valve 1522 and the gear control of the gear handle valve 13 form interlocking control, and the vehicle gear switching function fails.
In one embodiment, the parking brake valve assembly 152 further comprises a first one-way valve 1523 in communication with the brake pump, the output of the first one-way valve 1523 being in communication with the reversing valve 1521.
The first check valve 1523 is used to control the opening or closing of the sequence valve 1522. When the parking brake switch 151 is unlocked, high-pressure gas in the gas storage tank passes through the parking brake switch 151 to open the reversing valve 1521, high-pressure oil in the brake pump reaches the port C of the parking brake valve assembly 152 through the first one-way valve 1523 and the reversing valve 1521, at the moment, high-pressure oil of the port C of the parking brake valve assembly 152 opens the sequence valve 1522, the high-pressure oil of the brake pump passes through the first one-way valve 1523 and the sequence valve 1522 to the port G2 of the parking brake valve assembly 152, namely, the port P of the shift handle valve 13, and when the shift handle valve 13 is operated, the high-pressure oil can be communicated to the ports A and B of the shift handle valve 13, so that the variable of the closed pump 12 is controlled. At the same time, the high-pressure oil at port C of the parking brake valve assembly 152 reaches the parking brake port of the speed reducer 16, and the parking is released.
In one embodiment, the parking brake device 15 further includes a door lock control valve 153 connected to the vehicle door, an input end of the door lock control valve 153 is communicated with the air tank, and an output end of the door lock control valve 153 is communicated with an input end of the parking brake switch 151.
The door lock control valve 153 is connected with the vehicle door, the door lock control valve 153 is used for detecting whether the vehicle door is closed, when the vehicle door is detected not to be closed, the door lock control valve 153 is disconnected, gas in the gas storage tank cannot enter the parking brake valve assembly 152, parking cannot be released at the moment, and safety is improved.
In one embodiment, the parking brake device 15 further includes an oil pressure control valve 154 connected to the engine, an input end of the oil pressure control valve 154 is communicated with an output end of the door lock control valve 153, and an output end of the oil pressure control valve 154 is communicated with an input end of the parking brake switch 151.
The oil pressure control valve 154 is connected to the engine, the oil pressure control valve 154 is used to detect the oil pressure of the engine, when the oil pressure of the engine is low, the oil pressure control valve 154 is disconnected, the gas in the gas tank cannot enter the parking brake valve assembly 152, and the parking cannot be released at this time. The door lock control valve 153, the engine oil pressure control valve 154, the parking brake switch 151 and the parking brake valve assembly 152 are sequentially connected in series, so that the parking brake device 15, a vehicle door and engine oil pressure form interlocking control, the safety is improved, and the engine is protected.
Optionally, in order to stably release the pressure during parking and prevent pressure fluctuation from causing incomplete parking release, the parking brake device 15 further includes a parking accumulator 155, and an output end of the parking accumulator 155 is respectively communicated with output ends of the sequence valve 1522 and the first check valve 1523.
In one embodiment, the parking brake device 15 further includes a shuttle valve 156 and a manual release parking assembly 157 in communication with a hydraulic oil tank, wherein an input end of the shuttle valve 156 is in communication with the parking brake valve assembly 152 and the manual release parking assembly 157, respectively, an output end of the shuttle valve 156 is in communication with the speed reducer 16, and the parking brake valve assembly 152 is connected in parallel with the manual release parking assembly 157.
The manual park release assembly 157 is used to manually release the park, preventing the vehicle from losing power. When the brake pump can not be used for providing high-pressure oil, the high-pressure oil directly enters the parking brake cavity of the speed reducing vehicle through the manual parking releasing component, and the manual parking releasing is realized. The parking brake valve assembly 152 and the manual parking release assembly 157 are connected through a shuttle valve 156, when the parking brake valve assembly 152 releases parking, the parking brake valve assembly 152 delivers high-pressure oil in a brake pump into the shuttle valve 156, and the high-pressure oil reaches a parking brake port of the speed reducer 16 through the shuttle valve 156 to release parking; when the manual parking releasing assembly 157 releases parking, the manual parking releasing assembly 157 outputs high-pressure oil in the hydraulic oil tank to the shuttle valve 156, the high-pressure oil reaches the parking brake port of the speed reducer 16 through the shuttle valve 156, parking is released, and therefore parking can be released when any path of high-pressure oil is supplied.
In one embodiment, the shuttle valve 156 includes a first control port a communicating with the speed reducer 16, a second control port b having one end communicating with the output end of the parking brake valve assembly 152, the other end communicating with the first control port a, and a third control port c having one end communicating with the output end of the manual release parking assembly 157, the other end communicating with the first control port a.
When the parking brake valve assembly 152 is unlocked, high-pressure oil at the port C of the parking brake valve assembly 152 pushes the steel ball in the shuttle valve 156 to the third port C, and the high-pressure oil reaches the parking brake port of the speed reducer 16 from the second port b and the first port a of the shuttle valve 156 to release the parking; when the parking releasing component 157 releases parking, the parking releasing component 157 outputs high-pressure oil in the hydraulic oil tank to the shuttle valve 156, the steel ball of the shuttle valve 156 is pushed to the second port b, the high-pressure oil enters the first port a from the third port c of the shuttle valve 156 and then reaches the parking brake port of the speed reducer 16 to release parking, the vehicle is prevented from losing power, and when the brake pump cannot provide high-pressure oil, the high-pressure oil directly enters the parking brake cavity of the speed reducer vehicle through the parking releasing component, so that the parking releasing is achieved manually.
In one embodiment, the manual de-parking assembly 157 includes a pump body 1571 and a second one-way valve 1572, an input of the pump body 1571 is in communication with the hydraulic tank, an output of the pump body 1571 is in communication with an input of the second one-way valve 1572, and an output of the second one-way valve 1572 is in communication with the third control port c.
When the parking is manually released, the input port of the pump body 1571 absorbs high-pressure oil in the hydraulic oil tank, then the high-pressure oil is output into the shuttle valve 156 through the output port of the second check valve 1572, the steel ball of the shuttle valve 156 is pushed to the second port b, the high-pressure oil enters the first port a from the third port c of the shuttle valve 156 and then reaches the parking brake port of the speed reducer 16 to release the parking, the power loss of the vehicle is prevented, and when the high-pressure oil cannot be provided by the brake pump, the high-pressure oil directly enters the parking brake cavity of the speed reducer vehicle through the manual parking release assembly, so that the manual parking release is realized.
Optionally, in order to stabilize the pressure during manual parking and prevent pressure fluctuation from causing incomplete parking release, the manual parking release assembly 157 further includes a manual pump accumulator 1573, an input end of the manual pump accumulator 1573 is communicated with an output end of the second check valve 1572, and an output end of the manual pump accumulator 1573 is communicated with the third control port c.
In one embodiment, in order to release the manual de-parking assembly after the manual de-parking is completed, the manual de-parking assembly 157 further includes a throttle valve 1574, one end of the throttle valve 1574 is communicated with the input end of the pump body 1571, and the other end of the throttle valve 1574 is communicated with the output end of the second check valve 1572.
The technical scheme of the invention also provides a support vehicle which comprises the support vehicle braking system.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention. One of ordinary skill in the art can understand and implement it without inventive effort.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention, and not to limit the same; although embodiments of the present invention have been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A braking system of a support frame vehicle is characterized by comprising a closed pump, a gear handle valve, a pedal valve and a parking braking device, wherein the closed pump is communicated with a motor, the pedal valve is communicated with an energy accumulator oil source, and the input end of the closed pump is communicated with the output end of the gear handle valve;
the pedal valve comprises a pedal valve body, a first pedal control valve connected with a first end of the pedal valve body and a second pedal control valve connected with a second end of the pedal valve body, wherein the input end of the first pedal control valve is communicated with the energy accumulator oil source, the output end of the first pedal control valve is communicated with the speed reducer, the input end of the second pedal control valve is communicated with the energy accumulator oil source, and the output end of the second pedal control valve is communicated with the input end of the gear handle valve;
the parking brake device comprises a parking brake switch communicated with the gas storage tank and a parking brake valve assembly communicated with the brake pump, the output end of the parking brake switch is communicated with the input end of the parking brake valve assembly, and the output end of the parking brake valve assembly is communicated with the input end of the speed reducer and the input end of the gear handle valve respectively.
2. The strut car brake system as defined in claim 1, wherein the parking brake valve assembly includes a reversing valve and a sequence valve, an input of the reversing valve being in communication with the parking brake switch, an output of the reversing valve being in communication with an input of the sequence valve, an output of the sequence valve being in communication with an input of the shift handle valve.
3. The strut vehicle brake system as defined in claim 2, wherein the parking brake valve assembly further comprises a first one-way valve in communication with a brake pump, an output of the first one-way valve being in communication with the reversing valve.
4. The strut car brake system according to any one of claims 1 to 3, wherein the parking brake device further comprises a door lock control valve connected to a vehicle door, an input of the door lock control valve being in communication with the air reservoir, and an output of the door lock control valve being in communication with an input of the parking brake switch.
5. The strut vehicle brake system as defined in claim 4, wherein the parking brake assembly further comprises an oil pressure control valve connected to the engine, an input of the oil pressure control valve being in communication with an output of the door lock control valve, an output of the oil pressure control valve being in communication with an input of the parking brake switch.
6. The strut vehicle brake system as defined in claim 5, wherein the parking brake device further comprises a shuttle valve and a manual de-parking assembly in communication with a hydraulic tank, an input of the shuttle valve being in communication with the parking brake valve assembly and the manual de-parking assembly, respectively, an output of the shuttle valve being in communication with the retarder, the parking brake valve assembly being connected in parallel with the manual de-parking assembly.
7. The strut car brake system as defined in claim 6, wherein the shuttle valve includes a first control port in communication with the speed reducer, a second control port having one end in communication with the output of the parking brake valve assembly and another end in communication with the first control port, and a third control port having one end in communication with the output of the manual park release assembly and another end in communication with the first control port.
8. The strut car brake system according to claim 7, wherein the manual de-parking assembly includes a pump body and a second one-way valve, an input of the pump body being in communication with the hydraulic tank, an output of the pump body being in communication with an input of the second one-way valve, an output of the second one-way valve being in communication with the third control port.
9. The strut car brake system according to claim 8, wherein the manual de-parking assembly further comprises a throttle valve, one end of the throttle valve being in communication with the input end of the pump body and the other end of the throttle valve being in communication with the output end of the second one-way valve.
10. A rack truck comprising a rack truck brake system as claimed in any one of claims 1 to 9.
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