CN203372217U - Large-tonnage electric forklift hydraulic braking system - Google Patents
Large-tonnage electric forklift hydraulic braking system Download PDFInfo
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- CN203372217U CN203372217U CN201320426939.5U CN201320426939U CN203372217U CN 203372217 U CN203372217 U CN 203372217U CN 201320426939 U CN201320426939 U CN 201320426939U CN 203372217 U CN203372217 U CN 203372217U
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Abstract
The utility model relates to a large-tonnage electric forklift hydraulic braking system which is simple in structure, safe and reliable. The hydraulic braking system comprises a parking brake, a power brake valve and a service brake. An oil source is provided for the system through a hydraulic work system which comprises an oil tank, an oil pump and a multi-directional control valve. The hydraulic braking system is characterized in that a parking pile-up valve and an energy accumulator are further included, a PF opening of the multi-directional control valve is connected with a pipeline filter, an oil outlet of the pipeline filter is connected with a front tee joint, after flow distribution through the front tee joint, one path is communicated with a P opening of the parking pile-up valve, the other path is respectively communicated with a P opening of the power brake valve and a P opening of the energy accumulator, a PA opening of the energy accumulator is connected with a PA opening of the power brake valve, an N opening of the power brake valve is connected with a steering system, and a Br opening of the power brake valve is communicated with an oil opening of the service brake.
Description
Technical field
The utility model relates to a kind of large-tonnage electri forklift hydraulic brake system.Be applicable to the fork truck brake field.
Background technology
Existing common electric fork truck adopts shoe brake more, and the electri forklift of domestic application self-cooled oil-immersed multi-disk brake had had development faster in recent years.Oil-immersed multi-disk brake is because adopting the multi-disc type structure, and when hydraulic oil enters brake cylinder, the application force that piston promotes reaction plate and friction disc is well-distributed, and hydraulic coupling and the linear variation relation of formed braking force, rapidly, steadily, deceleration and stopping performance is stable, has higher safety in braking.The self-cooled multifunctional wet brake, by the lubricating oil Cooling and Lubricator wet braking dish of lubricated retarder, the Cooling and Lubricator oil in brake disc is what to separate with the medium of brake system.Oil-immersed multi-disk brake can adopt braking liquid or hydraulic oil as medium, by hydraulic brake system, realizes service brake.The self-cooled multifunctional wet brake is integrated parking braking function, braking during standstill has again mechanical type and fluid pressure type to distinguish.
The electri forklift of existing balance weight type coupling self-cooled multifunctional wet brake, can be divided into following two classes: (1) little tonnage electri forklift: comprise 1～2 ton of three pivot electric forklift, 1～5 ton of four pivot electric forklift; (2) large-tonnage electri forklift: comprise four pivot electric forklifts more than 6 tons.
Little tonnage electri forklift, when coupling self-cooled multifunctional wet brake, adopt braking liquid as medium usually, by brake treadle mechanism, promotes the master brake cylinder piston, and braking liquid is pressed into to oil-immersed multi-disk brake, realizes service brake.Braking during standstill adopts mechanical type, by hand braking manipulator, pulls parking vehicle brake lever, realizes braking during standstill.The little tonnage electri forklift of at present domestic and international Forklift Industry, when coupling self-cooled multifunctional wet brake, this brake mode of more employing.1～2 ton of three fulcrum forklift that for example pitch in Hangzhoupro, 2～3.5 ton of four fulcrum forklift.
The large-tonnage electri forklift, refer to four pivot electric forklifts more than 6 tons.By the product of domestic autonomous innovation research and development, market sale is almost blank at present.The large-tonnage electri forklift, when coupling self-cooled multifunctional wet brake, adopt hydraulic oil as medium usually.Multifunctional wet brake is integrated service brake and parking braking function.For the multifunctional wet brake of integrated braking during standstill and running braking function, the pressure that braking during standstill needs is little, and the pressure that service brake needs is large, and this just needs hydraulic brake system to set up two different oil sources.For electri forklift, because be subject to the restriction of the factors such as motor, amount controller, cost, restricted the quantity of oil sources, oil pump.Usually the hydraulic system of large-tonnage electri forklift adopts the form of Dual-pump flow-converging to meet the demand of work system, two working barrel work are arranged, so hydraulic system, steering swivel system and the brake system of car load are organically combined, utilizing oil sources, oil pump and the motor of hydraulic system to realize service brake and braking during standstill, is reasonable, the most economic technical measures and method.
Summary of the invention
The technical problems to be solved in the utility model is: for the problem of above-mentioned existence, provide a kind of simple in structure, safe and reliable and lower-cost large-tonnage electri forklift hydraulic brake system.
The technical scheme that the utility model adopts is: a kind of large-tonnage electri forklift hydraulic brake system, this hydraulic brake system comprises Parking Brake, dynamic brake valve and running brake, this system provides oil sources by the hydraulic system, the hydraulic system has fuel tank, oil pump and multiple directional control valve, it is characterized in that: this hydraulic brake system also comprises Parking pile-up valve and energy storage, the PF mouth connecting line filter of described multiple directional control valve, threeway before the oil outlet of in-line filter connects, after premenstrual distributing T-pipe, a road is communicated with the P mouth of Parking pile-up valve; Another road after front distributing T-pipe is connected with the P mouth of dynamic brake valve and the P mouth of energy storage respectively; The PA mouth of described energy storage connects the PA mouth of dynamic brake valve, and the N mouth of described dynamic brake valve connects steering swivel system, and the Br mouth of dynamic brake valve communicates with the hydraulic fluid port of running brake.
Described Parking pile-up valve, energy storage and dynamic brake valve are equipped with the T mouth, and connect fuel tank by low-pressure oil return pipe road and four-way.
Integrated monostable flow divider valve on described multiple directional control valve, monostable flow divider valve comprises provides flow divider valve, the check valve I of stablizing fractional flow and the by pass valve I that limits bleed off circuit pressure, the flow divider valve oil inlet is connected multiple directional control valve P1 mouth, and one of flow divider valve distributes hydraulic fluid port and is communicated with multiple directional control valve PF mouth through the check valve I.
Described Parking pile-up valve comprises reducing valve, by pass valve II, check valve II, Parking electromagnetic valve and Parking energy storage, the P mouth of Parking pile-up valve is divided into two-way through reducing valve, one tunnel is communicated with Parking pile-up valve T mouth through the by pass valve II, another road is divided into two-way through the check valve II, one tunnel is communicated with the Parking electromagnetic valve, the Parking electromagnetic valve is communicated with Parking pile-up valve A mouth, and another road is communicated with the Parking energy storage; The reducing valve drain tap is communicated with the T mouth of described Parking pile-up valve, and Parking pile-up valve A mouth connects Parking Brake through the Parking threeway.
Described Parking electromagnetic valve is two-position three way magnetic valve.
Described energy storage comprises check valve III, minimum safe pressure alarm switch, accumulation of energy body and by pass valve III, and energy storage P mouth is divided into two-way successively after check valve III and accumulation of energy body, and a road is communicated with energy storage PA mouth, and another road is communicated with energy storage T mouth through the by pass valve III; The minimum safe pressure alarm switch is installed on described accumulation of energy body.
Described in-line filter is provided with bypass disc and differential pressure signaling device.
Setting pressure switch in described Parking threeway.
The beneficial effects of the utility model are:
(1), utilize in the hydraulic system monostable flow divider valve on multiple directional control valve to distribute the stable flow that turns to and brake, do not need to provide in addition oil sources just can solve wet type braking during standstill and service brake oil sources problem, make brake system of forklift, steering swivel system and hydraulic system become an organic whole.
(2), the utility model braking during standstill is removed rapidly, and is remained steady.
, utilize the emergent braking during standstill of removing of little pressure oil of Parking energy storage, utilize the large pressure oil of energy storage storage, implement urgent service brake, safe.
, adopt the electric automatic control function, utilize electromagnetic valve, pressure switch, in conjunction with the director demon setting, make trailer reversing accurately convenient.
, pipeline system is simple, installation and maintenance are convenient.
The accompanying drawing explanation
Fig. 1 is the utility model hydraulic brake system schematic diagram.
The specific embodiment
As shown in Figure 1, provide service brake, braking during standstill, steering swivel system oil sources with hydraulic system fuel tank 1 and oil pump 2 in the present embodiment.The oil outlet of oil pump 2 is connected with P1 mouth (oil inlet) on the multiple directional control valve of integrated monostable flow divider valve 3 oil-feed valve blocks.Multiple directional control valve PF mouth (oil outlet) is connected with in-line filter 4 oil inlets, and this in-line filter filter pressure oil guarantees the cleanliness level of this road pressure oil, and is provided with bypass disc and differential pressure signaling device on in-line filter 4.The premenstrual threeway 5 of in-line filter 4 oil outlet is divided into two-way, and a road is connected with the P mouth (oil inlet) of Parking pile-up valve 6, and another Lu Jinghou threeway 10 is divided into two-way.On Parking pile-up valve 6 A mouth (oil outlet) with the Parking Brake 9 of fork truck left and right, be connected respectively after Parking threeway 7 is connected, provide post-decompression braking during standstill oil sources, wherein setting pressure switch 8 in Parking threeway 7.In this example through after threeway 10Hou mono-tunnel with the P mouth (oil inlet) of energy storage 11, be connected, another road is connected with the P mouth of dynamic brake valve 12.Energy storage 11 and running brake 12 Combination application, provide the emergency braking oil sources, pressure store oil in this energy storage, and its PA mouth (oil outlet) communicates with the PA mouth of dynamic brake valve 12.The N mouth of dynamic brake valve 12 switches through to system, and the Br mouth communicates with the hydraulic fluid port of the running brake 13 of about fork truck respectively, and dynamic brake valve 12 connects the service brake stretcher by connecting rod mechanism.In the present embodiment, the T mouth (return opening) of Parking pile-up valve 6, energy storage 11 and dynamic brake valve 12 is connected four-way 14, and the low pressure oil return is through four-way 14 oil sump tanks 1.
In this example, monostable flow divider valve is comprised of flow divider valve 3-1, check valve I 3-2 and by pass valve I 3-3, and wherein flow divider valve 3-1 and check valve I 3-2 provide stable fractional flow, and by pass valve I 3-3 limits the pressure of bleed off circuit.Flow divider valve 3-1 oil inlet is connected multiple directional control valve P1 mouth, and one of flow divider valve 3-1 distributes hydraulic fluid port and is communicated with multiple directional control valve PF mouth through check valve I 3-2.
Parking pile-up valve 6 is integrated with in reducing valve 6-1, by pass valve II 6-2, check valve II 6-3, this example of Parking electromagnetic valve 6-4(and selects two-position three way magnetic valve), Parking energy storage 6-5 etc., Parking pile-up valve P mouth connects reducing valve 6-1 oil inlet, reducing valve 6-1 oil outlet is divided into two-way, one tunnel is communicated with Parking pile-up valve T mouth through by pass valve II 6-2, another road is divided into two-way after check valve II 6-3, one tunnel is communicated with Parking electromagnetic valve 6-4, Parking electromagnetic valve 6-4 is communicated with Parking pile-up valve A mouth, and another road is communicated with Parking energy storage 6-5; Reducing valve 6-1 drain tap is communicated with the T mouth of Parking pile-up valve 6.
Be integrated with check valve III 11-1, minimum safe pressure alarm switch 11-2, accumulation of energy body 11-3 and by pass valve III 11-4 in the present embodiment on energy storage 11, energy storage P mouth is communicated with accumulation of energy body 11-3 import through check valve III 11-1, accumulation of energy body 11-3 oil outlet is divided into two-way, one tunnel is communicated with energy storage PA mouth, and another road is communicated with energy storage T mouth through by pass valve III 11-4.Minimum safe pressure alarm switch 11-2 is installed in this example on accumulation of energy body 11-3.
The principle of work of the present embodiment and working process:
Vehicle is not when connecing power supply, and Parking electromagnetic valve 6-4 must not be electric, and Parking Brake 9 and fuel tank 1 communicate, and are now the braking during standstill state.
When vehicle switches on power, oil pump 2 work, hydraulic oil is transported to multiple directional control valve 3 from fuel tank 1, and a part of pressure oil separated through monostable flow divider valve filter 4 by the road filters, and feeds to Parking pile-up valve 6, energy storage 11 and dynamic brake valve 12.Redundance hydraulic oil connects the work system oil return line from the T mouth of multiple directional control valve 3, gets back to fuel tank 1.
When the service brake stretcher is not stepped on, pressure oil, by the inside oil duct of dynamic brake valve 12, by the N mouth, enters the deflector of steering swivel system.Two kinds of operating modes are now arranged: a kind of be deflector in meta, pressure oil is got back to fuel tank from deflector T mouth, Parking pile-up valve 6, energy storage 11 and dynamic brake valve 12 are not worked; The second operating mode is that deflector is not in meta, deflector is turned left or is turned right, and now pressure oil enters Parking pile-up valve 6, energy storage 11, to Parking energy storage 6-5 and energy storage 11 topping ups on Parking pile-up valve 6, and enter deflector by the N mouth of dynamic brake valve 12, carry out fluid-link steering.
When stepping on the service brake stretcher to turn to/braking mode or braking mode, the pressure oil that filter 4 filters by the road enters Parking pile-up valve 6, energy storage 11, to Parking energy storage 6-5 and energy storage 11 topping ups on Parking pile-up valve 6.
Beat direction and step on two kinds of operating mode of service brake stretcher, all can make pressure oil through reducing valve 6-1 decompression, by check valve II 6-3, to energy storage 6-5 topping up on Parking pile-up valve 6, the top pressure of energy storage 6-5 topping up is limited by by pass valve II 6-2; Make simultaneously pressure oil through check valve III 11-1 to accumulation of energy body 11-3 topping up, the top pressure of accumulation of energy body 11-3 topping up is limited by by pass valve III 11-4.The hydraulic oil source of the little pressure that two kinds of above-mentioned topping up states need Parking energy storage 6-5 acquisition braking during standstill, energy storage 11 obtains the hydraulic oil source of the required large pressure of walking braking.
Press the Parking of lower vehicle and control push switch, Parking electromagnetic valve 6-4 obtains electric.Parking electromagnetic valve 6-4 is two-position three way magnetic valve, obtain electric after, the little pressure oil in Parking energy storage 6-5 enters in the oil pocket of Parking Brake 9, the braking force that little pressure oil release spring loads, braking during standstill is removed.The instant Parking pressure that detects of Parking pressure switch 8.When pressure is too small or braking during standstill while not removing, the programming vehicle can not start.Now need to check oil pipe and connection.Again step on the service brake stretcher, carry out topping up.The premenstrual threeway 5 of pressure oil that comes from oil pump 2 flows to Parking pile-up valve 6, to Parking energy storage 6-5 topping up, can enter in the oil pocket of Parking Brake 9 through Parking electromagnetic valve 6-4 simultaneously, removes braking during standstill.When the pressure of braking during standstill pressure oil is greater than the oil pressure relief that by pass valve II 6-2 sets, pressure oil passes through by pass valve II 6-2 oil sump tank 1.After removing braking during standstill, vehicle just can be walked, turned to and be worked.Vehicle to run, turn to working process in, due to the unidirectional action that check valve II 6-3 is arranged, the little pressure oil in Parking energy storage 6-5 remains and Parking Brake 9 communicating states, guarantees that Parking Brake 9 is in disarm state.Until while needing Parking, press back Parking and control push switch, Parking electromagnetic valve 6-4 outage, Parking Brake 9 and fuel tank 1 communicate, and vehicle is in the braking during standstill state.
When vehicle to run turns to, do not step on the service brake stretcher, pressure oil, by the inside oil duct of dynamic brake valve 12, by the N mouth, enters steering swivel system and carries out work.
When Vehicular turn and service brake joint operation, step on the service brake stretcher to turn to/braking mode, in the dynamic brake valve, the P mouth is still being opened to N mouth passage, steering swivel system work, the P mouth is opened to the Br mouth simultaneously, and pressure oil enters in the oil pocket of running brake 13, implements service brake.
When vehicle carries out service brake, step on the service brake stretcher to braking mode, in the dynamic brake valve, the P mouth is to N mouth pathway closure, and the P mouth is opened to the Br mouth, and pressure oil enters in the oil pocket of running brake 13, implements stopping brake.
When oil pump 2 is not worked, or while emergency occurring, step on the service brake stretcher to urgent service brake state, in energy storage 11, pressure oil enters the PA mouth of dynamic brake valve 12 from the PA mouth, dynamic brake valve PA mouth is opened to Br mouth passage, pressure oil enters in the oil pocket of running brake 13, implements emergency braking.Through implementing emergency braking, when energy storage 11 pressure oils discharge the oil pressure that causes energy storage 11 lower than the alarm pressure of alarm switch 11-2, annunciator rings, and needs energy storage 11 is carried out to topping up.
When the work of the equipment of work system, the pressure oil of oil pump 2 input multiple directional control valves 3 is except some distributes the PF mouth, and another part pressure oil is joined to flow in the hydraulic system and gone, to meet hoisting and the work such as inclination of door frame.
Claims (8)
1. a large-tonnage electri forklift hydraulic brake system, this hydraulic brake system comprises Parking Brake (9), dynamic brake valve (12) and running brake (13), this system provides oil sources by the hydraulic system, the hydraulic system has fuel tank (1), oil pump (2) and multiple directional control valve (3), it is characterized in that: this hydraulic brake system also comprises Parking pile-up valve (6) and energy storage (11), the PF mouth connecting line filter (4) of described multiple directional control valve (3), threeway (5) before the oil outlet of in-line filter (4) connects, after premenstrual threeway (5) shunting, a road is communicated with the P mouth of Parking pile-up valve (6), another road after front threeway (5) shunting is connected with the P mouth of dynamic brake valve (12) and the P mouth of energy storage (11) respectively, the PA mouth of described energy storage (11) connects the PA mouth of dynamic brake valve (12), and the N mouth of described dynamic brake valve (12) connects steering swivel system, and the Br mouth of dynamic brake valve (12) communicates with the hydraulic fluid port of running brake (13).
2. large-tonnage electri forklift hydraulic brake system according to claim 1, it is characterized in that: described Parking pile-up valve (6), energy storage (11) and dynamic brake valve (12) are equipped with the T mouth, and connect fuel tank (1) by low-pressure oil return pipe road and four-way (14).
3. large-tonnage electri forklift hydraulic brake system according to claim 1 and 2, it is characterized in that: the upper integrated monostable flow divider valve of described multiple directional control valve (3), monostable flow divider valve comprises provides flow divider valve (3-1), the check valve I (3-2) of stablizing fractional flow and the by pass valve I (3-3) that limits bleed off circuit pressure, flow divider valve (3-1) oil inlet is connected multiple directional control valve (3) P1 mouth, and one of flow divider valve (3-1) distributes hydraulic fluid port and is communicated with multiple directional control valve (3) PF mouth through check valve I (3-2).
4. large-tonnage electri forklift hydraulic brake system according to claim 1, it is characterized in that: described Parking pile-up valve (6) comprises reducing valve (6-1), by pass valve II (6-2), check valve II (6-3), Parking electromagnetic valve (6-4) and Parking energy storage (6-5), the P mouth of Parking pile-up valve (6) is divided into two-way through reducing valve (6-1), one tunnel is communicated with Parking pile-up valve (6) T mouth through by pass valve II (6-2), another road is divided into two-way through check valve II (6-3), one tunnel is communicated with Parking electromagnetic valve (6-4), Parking electromagnetic valve (6-4) is communicated with Parking pile-up valve (6) A mouth, another road is communicated with Parking energy storage (6-5), reducing valve (6-1) drain tap is communicated with the T mouth of described Parking pile-up valve 6, and Parking pile-up valve (6) A mouth connects Parking Brake (9) through Parking threeway (7).
5. large-tonnage electri forklift hydraulic brake system according to claim 4, it is characterized in that: described Parking electromagnetic valve (6-4) is two-position three way magnetic valve.
6. large-tonnage electri forklift hydraulic brake system according to claim 1 and 2, it is characterized in that: described energy storage (11) comprises check valve III (11-1), minimum safe pressure alarm switch (11-2), accumulation of energy body (11-3) and by pass valve III (11-4), energy storage (11) P mouth is divided into two-way successively after check valve III (11-1) and accumulation of energy body (11-3), one tunnel is communicated with energy storage (11) PA mouth, and another road is communicated with energy storage (11) T mouth through by pass valve III (11-4); The upper minimum safe pressure alarm switch (11-2) of installing of described accumulation of energy body (11-3).
7. large-tonnage electri forklift hydraulic brake system according to claim 1, it is characterized in that: described in-line filter (4) is provided with bypass disc and differential pressure signaling device.
8. large-tonnage electri forklift hydraulic brake system according to claim 4, is characterized in that: the upper setting pressure switch (8) of described Parking threeway (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320426939.5U CN203372217U (en) | 2013-07-18 | 2013-07-18 | Large-tonnage electric forklift hydraulic braking system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320426939.5U CN203372217U (en) | 2013-07-18 | 2013-07-18 | Large-tonnage electric forklift hydraulic braking system |
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| CN203372217U true CN203372217U (en) | 2014-01-01 |
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| CN201320426939.5U Expired - Lifetime CN203372217U (en) | 2013-07-18 | 2013-07-18 | Large-tonnage electric forklift hydraulic braking system |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103359097A (en) * | 2013-07-18 | 2013-10-23 | 杭叉集团股份有限公司 | Hydraulic braking system of large-tonnage electric fork-lift truck |
| CN106314405A (en) * | 2016-09-17 | 2017-01-11 | 西安科技大学 | Large-tonnage hydraulic mining vehicle braking system and method |
| 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 |
| CN107264498A (en) * | 2017-05-27 | 2017-10-20 | 徐工集团工程机械股份有限公司科技分公司 | It is a kind of that there is the electrichydraulic control hand brake system for exporting oil sources |
| CN107344548A (en) * | 2017-07-31 | 2017-11-14 | 安徽合力股份有限公司 | A kind of Electro-hydraulic brake system for electri forklift Brake energy recovery |
| CN109249918A (en) * | 2018-09-26 | 2019-01-22 | 三汽车制造有限公司 | Brake fluid system and vehicle |
| CN109969153A (en) * | 2017-12-28 | 2019-07-05 | 比亚迪股份有限公司 | A kind of truck hydraulic energy assisted braking system |
| CN113619544A (en) * | 2021-08-18 | 2021-11-09 | 湖南三一中型起重机械有限公司 | Hydraulic brake system and working machine |
| CN113635966A (en) * | 2021-09-06 | 2021-11-12 | 中国铁建重工集团股份有限公司 | Four-wheel drive slip steering chassis hydraulic control system |
| CN114179907A (en) * | 2022-01-06 | 2022-03-15 | 安徽合力股份有限公司 | Hydraulic steering and parking braking control hydraulic system for electric industrial vehicle |
-
2013
- 2013-07-18 CN CN201320426939.5U patent/CN203372217U/en not_active Expired - Lifetime
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103359097A (en) * | 2013-07-18 | 2013-10-23 | 杭叉集团股份有限公司 | Hydraulic braking system of large-tonnage electric fork-lift truck |
| CN106314405A (en) * | 2016-09-17 | 2017-01-11 | 西安科技大学 | Large-tonnage hydraulic mining vehicle braking system and method |
| CN106314405B (en) * | 2016-09-17 | 2023-03-14 | 西安科技大学 | Hydraulic braking system and method for large-tonnage mining vehicle |
| 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 |
| CN107264498A (en) * | 2017-05-27 | 2017-10-20 | 徐工集团工程机械股份有限公司科技分公司 | It is a kind of that there is the electrichydraulic control hand brake system for exporting oil sources |
| CN107344548A (en) * | 2017-07-31 | 2017-11-14 | 安徽合力股份有限公司 | A kind of Electro-hydraulic brake system for electri forklift Brake energy recovery |
| CN109969153A (en) * | 2017-12-28 | 2019-07-05 | 比亚迪股份有限公司 | A kind of truck hydraulic energy assisted braking system |
| CN109969153B (en) * | 2017-12-28 | 2020-06-19 | 比亚迪股份有限公司 | Hydraulic power-assisted braking system of forklift |
| CN109249918A (en) * | 2018-09-26 | 2019-01-22 | 三汽车制造有限公司 | Brake fluid system and vehicle |
| CN113619544A (en) * | 2021-08-18 | 2021-11-09 | 湖南三一中型起重机械有限公司 | Hydraulic brake system and working machine |
| CN113635966A (en) * | 2021-09-06 | 2021-11-12 | 中国铁建重工集团股份有限公司 | Four-wheel drive slip steering chassis hydraulic control system |
| CN114179907A (en) * | 2022-01-06 | 2022-03-15 | 安徽合力股份有限公司 | Hydraulic steering and parking braking control hydraulic system for electric industrial vehicle |
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Granted publication date: 20140101 |