CN108331791A - A kind of hydraulic system released without decompression valve type fork-lift truck stopping brake - Google Patents
A kind of hydraulic system released without decompression valve type fork-lift truck stopping brake Download PDFInfo
- Publication number
- CN108331791A CN108331791A CN201810108571.5A CN201810108571A CN108331791A CN 108331791 A CN108331791 A CN 108331791A CN 201810108571 A CN201810108571 A CN 201810108571A CN 108331791 A CN108331791 A CN 108331791A
- Authority
- CN
- China
- Prior art keywords
- valve
- oil cylinder
- oil
- brake release
- switch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000006837 decompression Effects 0.000 title claims abstract description 8
- 239000003921 oil Substances 0.000 claims abstract description 61
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 21
- 230000008676 import Effects 0.000 claims description 2
- 230000007812 deficiency Effects 0.000 abstract description 2
- 230000003111 delayed effect Effects 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 5
- 230000005611 electricity Effects 0.000 description 4
- 239000000446 fuel Substances 0.000 description 2
- 206010020852 Hypertonia Diseases 0.000 description 1
- 206010037660 Pyrexia Diseases 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 230000005923 long-lasting effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002085 persistent effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/07509—Braking
-
- 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
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
-
- 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
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
- F15B20/002—Electrical failure
-
- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
-
- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/14—Energy-recuperation means
Abstract
The present invention provides a kind of hydraulic system released without decompression valve type fork-lift truck stopping brake, the hydraulic oil in hydraulic oil container is imported through check valve in brake release oil cylinder including gear pump, the outlet end of the check valve is connect with the oil inlet of accumulator, low tension switch and two-bit triplet solenoid directional control valve respectively by four-way valve, and the actuator port of the two-bit triplet solenoid directional control valve is connect with alarm for high voltage switch, brake release oil cylinder respectively by third triple valve；The oil return opening of the two-bit triplet solenoid directional control valve is connect with overflow valve, hydraulic oil container respectively by the second triple valve.When driving, the releasing power that brake release oil cylinder is provided by accumulator, without pressure reducing valve is arranged；And gear pump only needs the situation in accumulator energy deficiency just to work, and overflow valve just understands gap sex work in the case where electric control system is delayed failure, therefore the hydraulic system of the present invention can reduce negative brake release energy loss, and has higher reliability.
Description
Technical field
The invention belongs to fork truck technical fields, and in particular to a kind of hydraulic pressure system released without decompression valve type fork-lift truck stopping brake
System.
Background technology
Because negative braking can realize self-stopping advantage when vehicle parking, the application on fork truck is more and more wider at present
It is general, and need to carry out negative brake release in driving for carrying out the braking system of vehicle parking using negative braking, and negative braking
The working range for releasing required pressure relief is relatively narrow, and required flow is smaller.So generally using gear pump by fuel tank
In hydraulic oil brake release oil cylinder supplied by check valve, pressure reducing valve carry out brake release, and fallen using overflow valve overflow more
Remaining system hydraulic oil.Since in entire driving conditions, gear pump needs to work always, overflow valve also needs to work long hours
Overflow situation just can guarantee that the brake release oil cylinder being connect with pressure reducing valve is in releasing state always.Cause energy loss larger,
Hydraulic System Fever is also larger.
Invention content
The object of the present invention is to provide a kind of hydraulic systems released without decompression valve type fork-lift truck stopping brake, have lower
Energy loss simultaneously has higher reliability.
To realize above-mentioned function, present invention employs following technical schemes：
A kind of hydraulic system released without decompression valve type fork-lift truck stopping brake, including gear pump pass through the hydraulic oil in hydraulic oil container
Check valve imports in brake release oil cylinder, the outlet end of the check valve by four-way valve respectively with accumulator, low tension switch and
The oil inlet of two-bit triplet solenoid directional control valve connects, and the actuator port of the two-bit triplet solenoid directional control valve passes through third triple valve
It is connect respectively with alarm for high voltage switch, brake release oil cylinder；The oil return opening of the two-bit triplet solenoid directional control valve passes through the two or three
Port valve is connect with overflow valve, hydraulic oil container respectively.
Further scheme, the gear pump are connected with motor, and the oil outlet of the gear pump is distinguished by the first triple valve
It is connect with check valve and overflow valve.
Further scheme, the low tension switch are open type pressure switch, and the setting pressure ratio of the low tension switch is braked
Release the high 0.5MPa of minimum pressure relief of oil cylinder；The alarm for high voltage switch is closed type pressure switch, alarm for high voltage switch
Setting pressure be equal to brake release oil cylinder highest pressure relief.
The oil pressure relief of the overflow valve is lower 0.5MPa than the highest pressure relief of brake release oil cylinder.
Further include electric control system, the input terminal of the electric control system is opened with low tension switch, alarm for high voltage respectively
The output end of powered-down connection, electric control system is electrically connected with motor, alarm respectively.
In entire driving conditions, the releasing power of brake release oil cylinder is provided by accumulator, without in brake release
Pressure reducing valve is set before oil cylinder；And gear pump only needs the situation in accumulator energy deficiency just to work, and overflow valve is in electricity
It is also idle under gas control system health, only just understands intermittence in the case where electric control system is delayed failure
Just understand continuous work in the case that work or electric-control system are entirely ineffective.So the hydraulic system of the present invention can reduce negative system
It is dynamic to release energy loss, and there is higher reliability.
This hydraulic system is mechanical-electrical-hydraulic integration design, acquires and receives by the electric control system carried on fork truck
The fuel injection pressure signal on oil circuit detected by low tension switch and alarm for high voltage switch, then controls the working condition of motor, to
The reliability of brake release system is improved on the basis of energy-efficient.
Description of the drawings
Fig. 1 is the hydraulic schematic diagram of the present invention；
In figure：1- hydraulic oil containers, 2- motors, 3- gear pumps, the first triple valves of 4-, 5- check valves, 6- four-way valves, 7- accumulators,
8- low tension switches, the second triple valves of 9-, 10- two-bit triplets solenoid directional control valve, 11- alarm for high voltage switch, 12- thirds triple valve,
13- brake releases oil cylinder, 14- overflow valves.
Specific implementation mode
The invention will be further described below in conjunction with the accompanying drawings：
As shown in Figure 1, a kind of hydraulic system released without decompression valve type fork-lift truck stopping brake, including gear pump 3 is by hydraulic oil container 1
In hydraulic oil imported in brake release oil cylinder 13 through check valve 5, the outlet end of the check valve 5 by four-way valve 6 respectively with
Accumulator 7, low tension switch 8 are connected with the oil inlet of two-bit triplet solenoid directional control valve 10, the two-bit triplet solenoid directional control valve 10
Actuator port connect respectively with alarm for high voltage switch 11, brake release oil cylinder 13 by third triple valve 12；Described two three
The oil return opening of electric change valve 10 is connect with overflow valve 14, hydraulic oil container 1 respectively by the second triple valve 9.
Further scheme, the gear pump 3 are connected with motor 2, and the oil outlet of the gear pump 3 passes through the first triple valve 4
It is connect respectively with check valve 5 and overflow valve 14.
Further scheme, the low tension switch 8 are open type pressure switch, the setting pressure ratio system of the low tension switch 8
The dynamic high 0.5MPa of minimum pressure relief for releasing oil cylinder 13；The alarm for high voltage switch 11 is closed type pressure switch, the height
Press the highest pressure relief that the setting pressure of alarm switch 11 is equal to brake release oil cylinder 13 low.
The oil pressure relief of the overflow valve 14 is lower 0.5MPa than the highest pressure relief of brake release oil cylinder 13.
Further include electric control system, the input terminal of the electric control system is opened with low tension switch 8, alarm for high voltage respectively
11 electrical connections are closed, the output end of electric control system is electrically connected with motor 2, alarm respectively.
Mesolow switch of the present invention is open type pressure switch, i.e., when pressure sets pressure less than it in oil circuit, low pressure
Switch is open circuit, i.e., it is located at S1 working positions；It is access to be then closed when pressure sets pressure higher than it in oil circuit, that is, is located at S2
Working position.The wherein high 0.5MPa of minimum pressure relief of the setting pressure ratio brake release oil cylinder 13 of low tension switch.
The alarm for high voltage switch is closed type pressure switch, i.e., is logical when pressure sets pressure less than it in oil circuit
Road is located at S3 working positions；When in oil circuit pressure higher than when set pressure to open a way, i.e., positioned at S4 working positions.Alarm for high voltage is opened
The setting pressure of pass is equal to the highest pressure relief of brake release oil cylinder 13.
There are two working positions for the two-bit triplet solenoid directional control valve, when the electromagnet of solenoid valve obtains electric, work in such as figure
Shown in it is the next, at this point, B mouthful of its oil inlet and C mouthfuls of unicom of actuator port, the disconnection of oil return inlet T mouth；When electromagnet dead electricity,
Work in it is upper as shown in Figure 1, at this time actuator port C mouthful with oil return inlet T mouth unicom, B mouthfuls of oil inlet disconnects.
The operation principle of the present invention：
When vehicle is in dead ship condition, the electromagnet of two-bit triplet solenoid directional control valve 10 is in power failure state, brake release oil cylinder
13 working chamber is connected to by the second triple valve 12, the C mouths of two-bit triplet solenoid directional control valve 10, T mouthfuls and third triple valve 9
Hydraulic oil container 1, brake release oil cylinder 12 resets under spring force is in parking brake condition.
After vehicle launch, press Parking braking release button, the electromagnet of two-bit triplet solenoid directional control valve 10 obtain it is electric, this
When vehicle electric control system detection low tension switch 8 operating position.If low tension switch 8 works in normal pressure working position
S2 illustrates that the pressure oil of the storage in accumulator 7 is used directly for Parking braking release, then the electricity for driving gear pump 3 to work
Machine 2 does not start, and the hydraulic oil in accumulator 7 passes through second by four-way valve 6, the B mouths of two-bit triplet solenoid directional control valve 10 and C mouthfuls
Triple valve 12 enters brake release oil cylinder 13, and the rodless cavity pressure in brake release oil cylinder 13, which rises, pushes piston overpowers spring
Power, piston rod stretch out, Parking braking release；If low tension switch 8 works in low pressure alarming position S1, electric control system if, starts
Motor 2 drives gear pump 3 to work, and sends out filling liquid alarming sound by vehicle buzzer, and gear pump 3 starts fuel feeding, and hydraulic oil is logical
Cross the first triple valve 4, check valve 5, four-way valve 6, the one of the oil outlet of four-way valve 6 gives that 7 filling liquid of accumulator, another by two
Into brake release oil cylinder 13, pressure is begun to ramp up in accumulator 7 at this time, is passed through for B mouths of position three-way solenoid valve 10 and C mouthfuls
Electric control system control delay motor 2 works after 3S, and motor 2 is shut down, and filling liquid caution sound stops.It is maintained at this time by accumulator 7
The brake release pressure of brake release oil cylinder 13.
In fork truck driving process, when 8 connecting line of low tension switch breaks down and disconnects, filling liquid caution sound will for a long time
Lasting to occur, motor 2 will persistently drive gear pump 3 to work, gear pump 3 for hydraulic oil by the first triple valve 4, check valve 5,
Four-way valve 6, the B mouths of two-bit triplet solenoid directional control valve 10 and C mouthfuls, directly drive brake release oil cylinder 13, and extra fluid passes through
One triple valve 4, overflow valve 14,9 oil return of the second triple valve to hydraulic oil container 1.Because overflow valve 14 is provided with, to avoid braking
Oil cylinder 12 is released to damage because of hypertonia.When filling liquid caution sound long lasting for, it is necessary to vehicle carry out maintenance and inspection.
When the spool jam failure of vehicle overflow valve 14 and 8 connecting line of low tension switch occur disconnecting failure, motor 2 will be held
It is continuous that gear pump 3 is driven to work, gear pump 3 pass through the first triple valve 4, check valve 5, four-way valve 6, two-bit triplet electricity for hydraulic oil
The B mouths of magnetic reversal valve 10 and C mouthfuls, directly drive brake release oil cylinder 13, and hydraulic system pressure persistently rises, when pressure rise extremely
When the setting pressure of alarm for high voltage switch 11, alarm for high voltage switch 11 switches to S4 by working position S3, and electric control system receives
After the persistent signal of alarm for high voltage switch 11, continuously decreases speed and close motor 2 immediately, send out caution sound, braking is avoided to solve
Except oil cylinder 13 is damaged because of high pressure.
Embodiment described above is only that the preferred embodiment of the present invention is described, not to the model of the present invention
It encloses and is defined, under the premise of not departing from design spirit of the present invention, technical side of the those of ordinary skill in the art to the present invention
The various modifications and improvement that case is made should all be fallen into the protection domain of claims of the present invention determination.
Claims (5)
1. a kind of hydraulic system released without decompression valve type fork-lift truck stopping brake, including gear pump（3）By hydraulic oil container（1）In
Hydraulic oil is through check valve（5）Import brake release oil cylinder（13）In, it is characterised in that：The check valve（5）Outlet end pass through
Four-way valve（6）Respectively with accumulator（7）, low tension switch（8）With two-bit triplet solenoid directional control valve（10）Oil inlet connection, it is described
Two-bit triplet solenoid directional control valve（10）Actuator port pass through third triple valve（12）It is switched respectively with alarm for high voltage（11）, braking
Release oil cylinder（13）Connection；The two-bit triplet solenoid directional control valve（10）Oil return opening pass through the second triple valve（9）Respectively with overflow
Flow valve（14）, hydraulic oil container（1）Connection.
2. hydraulic system according to claim 1, it is characterised in that：The gear pump（3）It is connected with motor（2）, described
Gear pump（3）Oil outlet pass through the first triple valve（4）Respectively with check valve（5）And overflow valve（14）Connection.
3. hydraulic system according to claim 1, it is characterised in that：The low tension switch（8）For open type pressure switch,
The low tension switch（8）Setting pressure ratio brake release oil cylinder（13）The high 0.5MPa of minimum pressure relief；The high pressure report
Alert switch（11）For closed type pressure switch, the alarm for high voltage switch（11）Setting pressure be equal to brake release oil cylinder（13）
Highest pressure relief.
4. hydraulic system according to claim 1, it is characterised in that：The overflow valve（14）Oil pressure relief than braking solve
Except oil cylinder（13）The low 0.5MPa of highest pressure relief.
5. hydraulic system according to claim 2, it is characterised in that：Further include electric control system, the electrical control
The input terminal of system respectively with low tension switch（8）, alarm for high voltage switch（11）Electrical connection, the output end difference of electric control system
With motor（2）, alarm electrical connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810108571.5A CN108331791A (en) | 2018-02-02 | 2018-02-02 | A kind of hydraulic system released without decompression valve type fork-lift truck stopping brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810108571.5A CN108331791A (en) | 2018-02-02 | 2018-02-02 | A kind of hydraulic system released without decompression valve type fork-lift truck stopping brake |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108331791A true CN108331791A (en) | 2018-07-27 |
Family
ID=62927959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810108571.5A Pending CN108331791A (en) | 2018-02-02 | 2018-02-02 | A kind of hydraulic system released without decompression valve type fork-lift truck stopping brake |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108331791A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109809332A (en) * | 2019-02-12 | 2019-05-28 | 安徽合力股份有限公司 | A kind of brake system of forklift |
| CN110388341A (en) * | 2019-07-22 | 2019-10-29 | 深圳东风汽车有限公司 | The control method that the solenoid valve of hydraulic system commutates without clamping stagnation |
| CN112648363A (en) * | 2020-12-14 | 2021-04-13 | 合升智能技术(无锡)有限公司 | Electric control automatic gear shifting hydraulic system of commercial vehicle gearbox |
| CN114906111A (en) * | 2022-06-09 | 2022-08-16 | 广西柳工机械股份有限公司 | Parking brake control system, control method thereof and loader |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1199845A (en) * | 1997-09-29 | 1999-04-13 | Nissan Diesel Motor Co Ltd | Accumulator energy regenerating device for vehicle |
| JPH11115538A (en) * | 1997-10-14 | 1999-04-27 | Nissan Diesel Motor Co Ltd | Brake device for accumulator hybrid vehicle |
| CN201633718U (en) * | 2010-04-02 | 2010-11-17 | 安徽合力股份有限公司 | Heavily-loaded forklift parking brake system |
| CN205524213U (en) * | 2016-02-17 | 2016-08-31 | 柳州柳工叉车有限公司 | Single loop fork truck hydraulic braking system |
| CN107021437A (en) * | 2017-05-16 | 2017-08-08 | 安徽合力股份有限公司 | Forklift hydraulic system with brake release hydraulic pressure subsystem |
| CN207961092U (en) * | 2018-02-02 | 2018-10-12 | 安徽合力股份有限公司 | A kind of hydraulic system released without decompression valve type fork-lift truck stopping brake |
-
2018
- 2018-02-02 CN CN201810108571.5A patent/CN108331791A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1199845A (en) * | 1997-09-29 | 1999-04-13 | Nissan Diesel Motor Co Ltd | Accumulator energy regenerating device for vehicle |
| JPH11115538A (en) * | 1997-10-14 | 1999-04-27 | Nissan Diesel Motor Co Ltd | Brake device for accumulator hybrid vehicle |
| CN201633718U (en) * | 2010-04-02 | 2010-11-17 | 安徽合力股份有限公司 | Heavily-loaded forklift parking brake system |
| CN205524213U (en) * | 2016-02-17 | 2016-08-31 | 柳州柳工叉车有限公司 | Single loop fork truck hydraulic braking system |
| CN107021437A (en) * | 2017-05-16 | 2017-08-08 | 安徽合力股份有限公司 | Forklift hydraulic system with brake release hydraulic pressure subsystem |
| CN207961092U (en) * | 2018-02-02 | 2018-10-12 | 安徽合力股份有限公司 | A kind of hydraulic system released without decompression valve type fork-lift truck stopping brake |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109809332A (en) * | 2019-02-12 | 2019-05-28 | 安徽合力股份有限公司 | A kind of brake system of forklift |
| CN109809332B (en) * | 2019-02-12 | 2023-09-15 | 安徽合力股份有限公司 | Fork truck braking system |
| CN110388341A (en) * | 2019-07-22 | 2019-10-29 | 深圳东风汽车有限公司 | The control method that the solenoid valve of hydraulic system commutates without clamping stagnation |
| CN112648363A (en) * | 2020-12-14 | 2021-04-13 | 合升智能技术(无锡)有限公司 | Electric control automatic gear shifting hydraulic system of commercial vehicle gearbox |
| CN114906111A (en) * | 2022-06-09 | 2022-08-16 | 广西柳工机械股份有限公司 | Parking brake control system, control method thereof and loader |
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