CN113883194A - Wet brake braking cooling system - Google Patents

Wet brake braking cooling system Download PDF

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Publication number
CN113883194A
CN113883194A CN202111060321.7A CN202111060321A CN113883194A CN 113883194 A CN113883194 A CN 113883194A CN 202111060321 A CN202111060321 A CN 202111060321A CN 113883194 A CN113883194 A CN 113883194A
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China
Prior art keywords
valve
port
brake
oil
combination valve
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CN202111060321.7A
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Chinese (zh)
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CN113883194B (en
Inventor
郭振华
许敬科
魏然
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Xuzhou Construction Machinery Group Co Ltd XCMG
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Xuzhou Construction Machinery Group Co Ltd XCMG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/78—Features relating to cooling
    • F16D65/84—Features relating to cooling for disc brakes
    • F16D65/853—Features relating to cooling for disc brakes with closed cooling system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/78—Features relating to cooling
    • F16D2065/783—Features relating to cooling cooling control or adjustment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/78—Features relating to cooling
    • F16D2065/787—Pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2121/00—Type of actuator operation force
    • F16D2121/02—Fluid pressure
    • F16D2121/04—Fluid pressure acting on a piston-type actuator, e.g. for liquid pressure

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Braking Systems And Boosters (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Abstract

The invention discloses a braking heat dissipation system of a wet brake, which comprises a variable plunger pump, an energy accumulator, a first combination valve and a brake cooling oil cavity, wherein the variable plunger pump is connected with the energy accumulator; a P port of the variable displacement plunger pump is communicated with a P1 port of the first combination valve, an LS port of the variable displacement plunger pump is communicated with an LS port of the first combination valve, and an AC1 port of the first combination valve is communicated with an oil port of the accumulator; an AC2 port of the first combination valve is communicated with a cooling oil way AC3, and a one-way valve is arranged between the cooling oil way AC3 and the cooling oil way AC 5; pressure oil at a port P of the variable displacement plunger pump enters a brake cooling oil cavity through an AC2 port of the combination valve I and a cooling oil way AC3 and then flows back to the hydraulic oil tank; when the resistance in the wet brake exceeds the set value of the one-way valve, the cooling oil directly flows back to the oil tank from the one-way valve; an AC6 port of the first combination valve is communicated with a wet brake cooling oil path AC4, pressure oil of the cooling oil path AC4 is introduced into an LS oil path of the variable displacement plunger pump, and pressure oil of the accumulator and the cooling oil path AC4 is compared through the first combination valve to control the displacement of the variable displacement plunger pump.

Description

Wet brake braking cooling system
Technical Field
The invention relates to the technical field of engineering vehicle braking systems, in particular to a braking heat dissipation system of a wet brake.
Background
The wet brake is a totally-enclosed multi-disc brake, integrates three functions of service braking, parking braking and emergency braking, has the advantages of large braking torque, stable braking, good waterproof performance and high thermal stability, and is generally applied to engineering machinery. Wet brakes often use forced cooling, where cooling oil is used to remove heat from the friction plates.
According to the technical scheme, the oil supply pump of the brake system adopts a gear pump, and after the pressure of the energy accumulator is completely charged, pressure oil in the gear pump overflows through an overflow valve and returns to an oil tank, so that the energy consumption of the hydraulic system is increased. Adopt another gear pump, the filter, the overflow valve constitutes cooling system, cools off the stopper, increases an original paper in the braking system, and the assembly space enlarges, has increased the fault point simultaneously, the cost increase.
Disclosure of Invention
The invention aims to provide a brake heat dissipation system of a wet brake, which realizes the cooling of a service brake, a parking brake and the wet brake of a vehicle.
The technical purpose of the invention is realized by the following technical scheme:
the invention adopts the following technical scheme for realizing the aim of the invention:
the invention provides a braking heat dissipation system of a wet brake, which comprises a variable plunger pump, an energy accumulator, a first combination valve and a brake cooling oil cavity, wherein the variable plunger pump is connected with the energy accumulator;
the P port of the variable displacement piston pump is communicated with the P1 port of the first combination valve, the LS port of the variable displacement piston pump is communicated with the LS port of the first combination valve, and the AC1 port of the first combination valve is communicated with the oil port of the accumulator;
when a vehicle is ignited, the variable plunger pump rotates along with an engine, pressure oil is output from a port P of the variable plunger pump, enters the first combination valve through a port P1 of the first combination valve, enters an energy accumulator through a port AC1 of the first combination valve to supplement hydraulic oil for the energy accumulator, and when the energy accumulator is stamped to a set value, the first combination valve jumps, the pressure of an oil way of the port LS of the variable plunger pump is reduced, the displacement of the variable plunger pump is reduced, the variable plunger pump is in a low-pressure standby state, and no pressure oil is output;
an AC2 port of the first combination valve is communicated with a wet brake cooling oil way AC3, and a one-way valve is arranged between the wet brake cooling oil way AC3 and the wet brake cooling oil way AC 5;
pressure oil at a port P of the variable displacement piston pump enters a brake cooling oil cavity through an AC2 port of the combination valve I and a wet brake cooling oil path AC 3;
when the resistance in the wet brake exceeds the set value of the check valve, the cooling oil directly flows back to the oil tank from the check valve;
and an AC6 port of the first combination valve is communicated with a wet brake cooling oil path AC4, pressure oil of the cooling oil path AC4 is introduced into an LS oil path of the variable displacement plunger pump, and the pressure oil of the accumulator and the cooling oil path AC4 is compared through the first combination valve to control the displacement of the variable displacement plunger pump.
Further, the combination valve I comprises a liquid filling valve and a first shuttle valve;
and after the energy accumulator is stamped to a set value, the liquid charging valve jumps, and the pressure of an oil way at an LS port of the variable plunger pump is reduced.
The pressure oil of the accumulator and the cooling oil path AC4 is compared through the first shuttle valve, and the displacement of the variable displacement plunger pump is controlled.
Further, the first combination valve further comprises an electromagnetic valve;
when the parking brake is applied to the vehicle, the electromagnetic valve is pressed, pressure oil in the energy accumulator enters the parking brake oil cavity of the brake through the PB port of the first combination valve, a pressure spring in the wet brake is pushed open, and the parking brake of the vehicle is released.
Furthermore, the wet brake braking heat dissipation system also comprises a pedal valve, a combination valve II and a service brake cavity;
when the vehicle performs service braking, a pedal valve is stepped, the pedal valve is switched from a left station to a right station, pressure oil in a P port of a variable displacement plunger pump enters the first combination valve through a P1 port of the first combination valve, the pressure oil in the AC1 port of the first combination valve and the pressure oil in the energy accumulator jointly enter the P port of the pedal valve, the pressure oil passes through an A port of the pedal valve through an A1 port of a second combination valve, and enters a service brake cavity of a wet brake after the second combination valve is selected, so that the vehicle is subjected to service braking;
in the vehicle braking process, when the oil pressure in the accumulator does not reach the set pressure value of the liquid charging valve, the variable displacement plunger pump is continuously in a low-pressure standby state;
when the pressure value in the accumulator is reduced to the set value of the liquid charging valve in the vehicle braking process, the LS port oil circuit of the variable plunger pump controls the displacement of the variable plunger pump to be increased, pressure oil output by the P port of the variable plunger pump enters the first combination valve through the P1 port of the first combination valve, and pressure oil enters the accumulator through the AC1 port of the first combination valve to supplement hydraulic oil for the accumulator.
Further, the second combination valve comprises a second shuttle valve;
pressure oil in a P port of the variable displacement plunger pump enters the first combination valve through a P1 port of the first combination valve, the pressure oil in the accumulator jointly enters a P port of the pedal valve through an AC1 port of the first combination valve, the pressure oil enters a service brake cavity of the wet brake through an A port of the pedal valve, an A1 port of the second combination valve and the selection of the second shuttle valve.
Further, the second combination valve further comprises an electric proportional brake valve connected with the pedal valve in parallel;
when the vehicle is used in an unmanned working condition, a remote control handle is used for controlling the electric proportional brake valve which is an inverse proportional brake valve, when the electric proportional brake valve is not powered, pressure oil in the energy accumulator enters the electric proportional brake valve through a port P of the second combination valve, enters the left side of the second shuttle valve through a lower station of the electric proportional brake valve, enters the service brake cavity through a port A2 of the second combination valve and performs service braking on the vehicle;
when the vehicle is required to run, the control current is set to be the maximum, the upper station of the electric proportional brake valve is in a working state, an oil way between pressure oil at a port P of the second combination valve and a wet brake is cut off, service braking is released, and the vehicle starts to run;
when braking is needed, the control current is reduced, and service braking is implemented.
The invention has the beneficial effects that:
the cooling oil circuit provided by the invention is provided with one path which is communicated with the LS port of the variable plunger pump, the variable plunger pump adjusts the discharge capacity of the variable plunger pump according to the pressure oil in the brake, when the brake is applied to service braking, the pressure oil in the cavity is increased, the discharge capacity of the variable plunger pump is adjusted by the LS port and then increased, the flow of the cooling oil entering the brake is increased, the cooling effect is enhanced, and the phenomenon that the temperature of the brake is overhigh is avoided;
the invention provides a hydraulic principle of a brake oil way and a cooling oil way of a wet brake, wherein a variable plunger pump is adopted to provide pressure oil for a pedal valve and a liquid charging valve, and the variable plunger pump adjusts the displacement according to the pressure value in an energy accumulator, so that the energy consumption is reduced;
the heat dissipation braking principle provided by the invention shares one variable plunger pump, so that the using number of parts is reduced, the cost is reduced, and fault points are reduced;
according to the heat dissipation braking principle provided by the invention, the one-way valve is arranged in the cooling oil way, when the resistance in the brake is greater than the set pressure value of the one-way valve, the cooling liquid directly flows back to the oil tank, the brake is not cooled, and the brake is protected from being impacted and failed by the pressurized oil;
the electric proportional brake valve is installed in the heat dissipation braking principle and is connected with the pedal valve in parallel, unmanned control of a vehicle is achieved, the electric proportional brake valve is an inverse proportional electromagnetic valve, and when the vehicle is in an emergency and loses power supply, the inverse proportional brake valve performs emergency braking, and traffic safety is guaranteed.
Drawings
Fig. 1 is a schematic diagram of a wet brake heat dissipation system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a first combination valve in a wet brake heat dissipation system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a second combination valve in a wet brake heat dissipation system according to an embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the attached drawings:
as shown in fig. 1-3, a brake heat dissipation system of a wet brake comprises a variable plunger pump 1, a service brake cavity 2, a second combination valve 3, a pedal valve 4, an energy accumulator 5, a first combination valve 6, a brake cooling oil cavity 7, a one-way valve 8 and a parking brake cavity 9.
The first combination valve 6 is provided with an electromagnetic valve 61, a pressure reducing valve 62, a liquid filling valve 63 and a first shuttle valve 64.
And the second combination valve 3 is provided with an electric proportional brake valve 31 and a second shuttle valve 32.
The P port of the variable plunger pump 1 is communicated with the P1 port of the combination valve I6, the LS port of the variable plunger pump 1 is communicated with the LS port of the combination valve I6, the AC1 port of the combination valve I6 is communicated with the oil port of the energy accumulator 5, the oil port of the energy accumulator 5 is respectively communicated with the P port of the pedal valve 4 and the P port of the electric proportional brake valve 31, and the pressure of the A port of the working port of the pedal valve 4 and the pressure of the B port of the working port of the electric proportional brake valve 31 are compared through the second shuttle valve 32 and then enter the service brake cavity 2 to apply service braking to the brake; a PB port of the first combination valve 6 is communicated with a brake cooling oil chamber 7; an AC2 port of the first combination valve 6 is communicated with a wet brake cooling oil way AC3, a one-way valve 8 is arranged between the wet brake cooling oil way AC3 and the wet brake cooling oil way AC5, when pressure oil in the wet brake is higher than a set pressure value of the one-way valve, flushing oil directly returns to a tank through the one-way valve and does not cool the brake, the wet brake cooling oil way AC4 is communicated with an AC6 port of the first combination valve 6, the pressure oil of the cooling oil way AC4 is led into an LS oil way of the variable plunger pump 1, and the pressure oil of the energy accumulator 5 and the pressure oil of the cooling oil way AC4 is compared through the first shuttle valve 64 to control the displacement of the variable plunger pump 1.
When the vehicle is ignited, the variable plunger pump 1 rotates along with the engine, pressure oil is output from the port P of the pump outlet, enters the combination valve 6 through the port P1 of the combination valve 6, enters the energy accumulator 5 through the port AC1 of the combination valve 6 to supplement hydraulic oil for the energy accumulator 5, when the energy accumulator 5 is stamped to a set value, the liquid charging valve 63 jumps, the pressure of an oil way of the port LS of the variable plunger pump 1 is reduced, the displacement of the variable plunger pump 1 is minimum, the variable plunger pump is in a low-pressure standby state, and no pressure oil is output.
When the vehicle performs service braking, a driver steps on the pedal valve 4, the pedal valve 4 is switched from the left station to the right station, pressure oil in a P port of the variable displacement plunger pump 1 enters the first combination valve 6 through a P1 port, enters a P port of the pedal valve 4 together with pressure oil in the energy accumulator 5 through an AC1 port of the first combination valve 6, passes through an A port of the pedal valve 4 through an A1 port of the second combination valve 3, enters a service brake cavity 2 of the wet brake after selection of the second shuttle valve 32, and the service braking of the whole vehicle is performed. When the vehicle is braked for two or three times and the oil pressure in the energy accumulator 5 does not reach the set pressure value of the liquid charging valve 63, the variable plunger pump 1 is continuously in a low-pressure small-displacement standby state, after the vehicle is braked for five or six times and the pressure value in the energy accumulator 5 is reduced to the set value of the liquid charging valve 63, the LS oil circuit controls the displacement of the variable plunger pump 1 to be increased, and the pressure oil output from the port P of the variable plunger pump 1 is continuously charged into the energy accumulator 5.
When the vehicle is braked in the parking mode, the solenoid valve DT1 is pressed, pressure oil in the accumulator 5 enters the parking brake cavity 9 through a PB port of the first combination valve 6, a parking pressure spring in the brake is pushed open, and the vehicle is braked in the parking mode.
And pressure oil at a port P in the variable plunger pump 1 enters a brake cooling oil cavity 7 through an AC2 port of the combination valve I6 and a wet brake cooling oil path AC3, and the cooling oil flows back to a hydraulic oil tank through a filter after passing through the brake cooling oil cavity 7. A check valve 8 is arranged in the cooling oil path, and when the resistance in the wet brake exceeds the set value of the check valve 8, the cooling oil directly flows back to the oil tank from the check valve 8 so as to prevent the wet brake from being damaged by high-pressure oil. The cooling oil path AC4 is connected with the LS oil path of the variable plunger pump 1, when the wet brake does not brake, the pressure oil in the wet brake is low, the variable plunger pump 1 is in a low-pressure and small-displacement state, when the wet brake brakes, the pressure oil in the cooling oil path is increased, the displacement of the variable plunger pump 1 is increased, the flow of the cooling oil path is increased, when the vehicle brakes, the flow of the cooling oil path is increased along with the increase of the pressure oil, and the phenomenon that the temperature of the brake is too high is avoided.
The brake cooling system is provided with an electric proportional brake valve 31, the electric proportional brake valve 31 is connected with a pedal valve 4 in parallel, when the vehicle is used in an unmanned working condition, a remote control handle is used for controlling the electric proportional brake valve 31, the electric proportional brake valve 31 is an inverse proportional brake valve, when the electric proportional brake valve 31 is not powered, pressure oil in an energy accumulator 5 enters the electric proportional brake valve 31 through a port P of a combination valve II 3, enters the left side of a shuttle valve 32 through a lower station of the electric proportional brake valve 31, enters a service brake cavity 2 of a brake through a port A2 of the combination valve II 3, service brake is carried out on the vehicle, when the vehicle needs to run, the current is applied to the maximum, an upper station of the electric proportional brake valve 31 is in a working state, the pressure oil at the port P of the combination valve II 3 and a wet brake are cut off, the service brake is released, the vehicle starts to run, when the vehicle needs to brake, a control current is slowly reduced, the vehicle brake system implements service brake, and the inverse proportion electromagnetic valve can brake the vehicle when the control current is suddenly cut off, so that the phenomenon that the vehicle cannot be braked is avoided, and the traffic safety is ensured.
While the preferred embodiments of the present invention have been illustrated and described, it will be appreciated that the invention may be embodied otherwise than as specifically described and that equivalent alterations and modifications, which may be effected thereto by those skilled in the art without departing from the spirit of the invention, are deemed to be within the scope and spirit of the invention.

Claims (6)

1. A wet brake braking heat dissipation system is characterized by comprising a variable plunger pump, an energy accumulator, a first combination valve and a brake cooling oil cavity;
the P port of the variable displacement piston pump is communicated with the P1 port of the first combination valve, the LS port of the variable displacement piston pump is communicated with the LS port of the first combination valve, and the AC1 port of the first combination valve is communicated with the oil port of the accumulator;
when a vehicle is ignited, the variable plunger pump rotates along with an engine, pressure oil is output from a port P of the variable plunger pump, enters the first combination valve through a port P1 of the first combination valve, enters an energy accumulator through a port AC1 of the first combination valve to supplement hydraulic oil for the energy accumulator, and when the energy accumulator is stamped to a set value, the first combination valve jumps, the pressure of an oil way of the port LS of the variable plunger pump is reduced, the displacement of the variable plunger pump is reduced, the variable plunger pump is in a low-pressure standby state, and no pressure oil is output;
an AC2 port of the first combination valve is communicated with a wet brake cooling oil way AC3, and a one-way valve is arranged between the wet brake cooling oil way AC3 and the wet brake cooling oil way AC 5;
pressure oil at a port P of the variable displacement plunger pump enters a brake cooling oil cavity through an AC2 port of the combination valve I and a wet brake cooling oil way AC3 and then flows back to a hydraulic oil tank;
when the resistance in the wet brake exceeds the set value of the check valve, the cooling oil directly flows back to the oil tank from the check valve;
and an AC6 port of the first combination valve is communicated with a wet brake cooling oil path AC4, pressure oil of the cooling oil path AC4 is introduced into an LS oil path of the variable displacement plunger pump, and the pressure oil of the accumulator and the cooling oil path AC4 is compared through the first combination valve to control the displacement of the variable displacement plunger pump.
2. A wet brake heat dissipation system of claim 1, wherein said combination valve comprises a charge valve, a first shuttle valve;
and after the energy accumulator is stamped to a set value, the liquid charging valve jumps, and the pressure of an oil way at an LS port of the variable plunger pump is reduced.
The pressure oil of the accumulator and the cooling oil path AC4 is compared through the first shuttle valve, and the displacement of the variable displacement plunger pump is controlled.
3. A wet brake heat dissipation system of claim 1, wherein said first combination valve further comprises a solenoid valve; when the parking brake is applied to the vehicle, the electromagnetic valve is pressed, pressure oil in the energy accumulator enters the brake cooling oil cavity through a PB port of the first combination valve, a pressure spring in the wet brake is jacked open, and the parking brake of the vehicle is released.
4. The wet brake cooling system of claim 1, further comprising a pedal valve, a second combination valve, a service brake chamber;
when the vehicle performs service braking, a pedal valve is stepped, the pedal valve is switched from a left station to a right station, pressure oil in a P port of a variable displacement plunger pump enters the first combination valve through a P1 port of the first combination valve, the pressure oil in the AC1 port of the first combination valve and the pressure oil in the energy accumulator jointly enter the P port of the pedal valve, the pressure oil passes through an A port of the pedal valve through an A1 port of a second combination valve, and enters a service brake cavity of a wet brake after the second combination valve is selected, so that the vehicle is subjected to service braking;
in the vehicle braking process, when the oil pressure in the accumulator does not reach the set pressure value of the liquid charging valve, the variable displacement plunger pump is continuously in a low-pressure standby state;
when the pressure value in the accumulator is reduced to the set value of the liquid charging valve in the vehicle braking process, the LS port oil circuit of the variable plunger pump controls the displacement of the variable plunger pump to be increased, pressure oil output by the P port of the variable plunger pump enters the first combination valve through the P1 port of the first combination valve, and pressure oil enters the accumulator through the AC1 port of the first combination valve to supplement hydraulic oil for the accumulator.
5. The wet brake cooling system of claim 4, wherein the second combination valve comprises a second shuttle valve; pressure oil in a P port of the variable displacement plunger pump enters the first combination valve through a P1 port of the first combination valve, the pressure oil in the accumulator jointly enters a P port of the pedal valve through an AC1 port of the first combination valve, the pressure oil enters a service brake cavity of the wet brake through an A port of the pedal valve, an A1 port of the second combination valve and the selection of the second shuttle valve.
6. The wet brake cooling system of claim 5, wherein the second combination valve further comprises an electrically proportional brake valve in parallel with the pedal valve;
when the vehicle is used in an unmanned working condition, a remote control handle is used for controlling the electric proportional brake valve which is an inverse proportional brake valve, when the electric proportional brake valve is not powered, pressure oil in the energy accumulator enters the electric proportional brake valve through a port P of the second combination valve, enters the left side of the second shuttle valve through a lower station of the electric proportional brake valve, enters the service brake cavity through a port A2 of the second combination valve and performs service braking on the vehicle;
when the vehicle is required to run, the control current is set to be the maximum, the upper station of the electric proportional brake valve is in a working state, an oil way between pressure oil at a port P of the second combination valve and a wet brake is cut off, service braking is released, and the vehicle starts to run;
when braking is needed, the control current is reduced, and service braking is implemented.
CN202111060321.7A 2021-09-10 2021-09-10 Wet brake braking heat dissipation system Active CN113883194B (en)

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Application Number Priority Date Filing Date Title
CN202111060321.7A CN113883194B (en) 2021-09-10 2021-09-10 Wet brake braking heat dissipation system

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Application Number Priority Date Filing Date Title
CN202111060321.7A CN113883194B (en) 2021-09-10 2021-09-10 Wet brake braking heat dissipation system

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CN113883194B CN113883194B (en) 2024-04-02

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0826097A (en) * 1994-07-15 1996-01-30 Toyo Umpanki Co Ltd Brake device for vehicle
DE19909690A1 (en) * 1999-03-05 2000-09-21 Voith Turbo Kg Method for controlling a hydrodynamic unit and control device
JP2008223899A (en) * 2007-03-13 2008-09-25 Tcm Corp Hst cooling circuit
CN102164788A (en) * 2008-08-29 2011-08-24 沃尔沃建筑设备公司 Brake system and vehicle comprising a brake system
CN202608756U (en) * 2012-05-17 2012-12-19 郑州宇通重工有限公司 Hydraulic brake control system of mine dump truck
CN104129373A (en) * 2014-07-30 2014-11-05 安徽合力股份有限公司 Heat dissipation type brake system for forklift
CN112377544A (en) * 2020-11-20 2021-02-19 徐州徐工矿业机械有限公司 Full-working-condition automatic-adjustment electro-hydraulic proportional wet disc brake cooling system and control method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0826097A (en) * 1994-07-15 1996-01-30 Toyo Umpanki Co Ltd Brake device for vehicle
DE19909690A1 (en) * 1999-03-05 2000-09-21 Voith Turbo Kg Method for controlling a hydrodynamic unit and control device
JP2008223899A (en) * 2007-03-13 2008-09-25 Tcm Corp Hst cooling circuit
CN102164788A (en) * 2008-08-29 2011-08-24 沃尔沃建筑设备公司 Brake system and vehicle comprising a brake system
CN202608756U (en) * 2012-05-17 2012-12-19 郑州宇通重工有限公司 Hydraulic brake control system of mine dump truck
CN104129373A (en) * 2014-07-30 2014-11-05 安徽合力股份有限公司 Heat dissipation type brake system for forklift
CN112377544A (en) * 2020-11-20 2021-02-19 徐州徐工矿业机械有限公司 Full-working-condition automatic-adjustment electro-hydraulic proportional wet disc brake cooling system and control method

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