CN104675768A - Walking hydraulic system for small all-hydraulic all-wheel drive road sweeper - Google Patents

Walking hydraulic system for small all-hydraulic all-wheel drive road sweeper Download PDF

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Publication number
CN104675768A
CN104675768A CN201510066145.6A CN201510066145A CN104675768A CN 104675768 A CN104675768 A CN 104675768A CN 201510066145 A CN201510066145 A CN 201510066145A CN 104675768 A CN104675768 A CN 104675768A
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China
Prior art keywords
hydraulic motor
mouth
oil hydraulic
oil
valve
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Application number
CN201510066145.6A
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Chinese (zh)
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CN104675768B (en
Inventor
陈彪
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Yangzhou Jinwei Environmental Protection Technology Co Ltd
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Yangzhou Jinwei Environmental Protection Technology Co Ltd
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/20Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205Systems with pumps
    • F15B2211/2053Type of pump
    • F15B2211/20546Type of pump variable capacity

Abstract

The invention discloses a walking hydraulic system for a small all-hydraulic all-wheel drive road sweeper in the technical field of environmental sanitation. Each hydraulic motor is connected in parallel, and each hydraulic motor is provided with a logical valve; when a vehicle runs normally, an oil port B of a variable pump assembly is an oil return port, an oil port A of the variable pump assembly is an oil outlet, and the oil port B and the oil port A can form a hydraulic loop together with each hydraulic motor and logical valve; when the vehicle is in a reverse state, the oil port B of the variable pump assembly is the oil outlet, the oil port A of the variable pump assembly is the oil return port, and the oil port B and the oil port A can form a hydraulic loop together with each hydraulic motor and logical valve; when the vehicle is in a differential state, a coil S3 of a differential lock electromagnetic valve is electrified, so that a flow distributing and collecting valve I is connected to the left front hydraulic motor and the right front hydraulic motor, a flow distributing and collecting valve II is connected to the left back hydraulic motor and the right back hydraulic motor, the logical valve is in an obstructed state, and by utilizing the characteristic of flow equalization of the flow distributing and collecting valves, the differential problem is completely solved.

Description

Small-sized full-hydraulic a11wheel drive road sweeper vibration hydraulic system
Technical field
The present invention relates to environmental sanitation technical field, particularly the small-sized road sweeper of one.
Background technique
In road sweeper walking process, need constantly to face the operating modes such as turning, concave-convex road surface, climbing, unavoidably producing differential phenomenon, in order to overcome differential problem, market being proposed various mechanical speed difference device, no doubt play good effect, but manufacture cost is higher.In order to overcome Cost Problems, market have developed all kinds of hydraulic system and solve differential problem, but practical effect be unsatisfactory, can not adapt to various road conditions, can not thoroughly solve differential problem, passing ability is also bad.
Summary of the invention
The object of this invention is to provide small-sized full-hydraulic a11wheel drive road sweeper vibration hydraulic system, can thoroughly solve differential problem, ensure the smoothness that vehicle travels can adapt to various road conditions.
The object of the present invention is achieved like this: small-sized full-hydraulic a11wheel drive road sweeper vibration hydraulic system, comprise motor, also comprise by the variable displacement pump assembly of engine control, left front oil hydraulic motor, right front oil hydraulic motor, left back oil hydraulic motor, right back oil hydraulic motor, described left front oil hydraulic motor, right front oil hydraulic motor, left back oil hydraulic motor, right back oil hydraulic motor are arranged in parallel; This system also comprises and controls left front oil hydraulic motor, right front oil hydraulic motor, left back oil hydraulic motor, the first logical valve of right back oil hydraulic motor, the second logical valve, the 3rd logical valve, the 4th logical valve respectively, the b mouth of described first logical valve, the second logical valve, the 3rd logical valve, the 4th logical valve is connected with the A hydraulic fluid port of left front oil hydraulic motor, right front oil hydraulic motor, left back oil hydraulic motor, right back oil hydraulic motor respectively, and a mouth of described first logical valve, the second logical valve, the 3rd logical valve, the 4th logical valve is connected with variable displacement pump assembly A hydraulic fluid port; Described first logical valve, the second logical valve, the 3rd logical valve, the c mouth of the 4th logical valve are connected with the b mouth of differential lock solenoid valve, the a mouth of described differential lock solenoid valve connects hydraulic oil container, the c mouth of described differential lock solenoid valve connects the connection oil circuit between all logical valves and variable displacement pump assembly A hydraulic fluid port, and the S3 coil of described differential lock solenoid valve is connected by guide line with control panel; The A hydraulic fluid port of described left front oil hydraulic motor, right front oil hydraulic motor is connected with the f mouth of flow divider-combiner one, g mouth respectively; The A hydraulic fluid port of described left back oil hydraulic motor, right back oil hydraulic motor is connected with the g mouth of flow divider-combiner two, f mouth respectively; The e mouth of described flow divider-combiner one, flow divider-combiner two is connected with variable displacement pump assembly A hydraulic fluid port; The B hydraulic fluid port of described left front oil hydraulic motor, right front oil hydraulic motor, left back oil hydraulic motor, right back oil hydraulic motor is connected with the B hydraulic fluid port of variable displacement pump assembly; During normal vehicle operation, the b mouth of differential latching solenoid valve and a mouth are connected; When vehicle produces differential, described control panel gives the S3 coil electrical signal of differential lock solenoid valve, and b mouth and the c mouth of described differential lock solenoid valve are connected.
When the present invention is in normal travelling state, ato unit, variable displacement pump assembly A hydraulic fluid port pumps hydraulic oil, make the first logical valve, the second logical valve, the 3rd logical valve, the 4th logical valve a mouth communicate with b mouth, now, the Leckage of all logical valves is by the c mouth of logical valve, the b mouth of differential lock solenoid valve and a mouth hydraulic return fuel tank; Hydraulic oil can enter the A hydraulic fluid port of left front oil hydraulic motor, right front oil hydraulic motor, left back oil hydraulic motor, right back oil hydraulic motor, thus drive left front oil hydraulic motor, right front oil hydraulic motor, left back oil hydraulic motor, right back oil hydraulic motor to rotate, the B hydraulic fluid port of left front oil hydraulic motor, right front oil hydraulic motor, left back oil hydraulic motor, right back oil hydraulic motor is connected with variable displacement pump assembly B hydraulic fluid port, now, variable displacement pump assembly B hydraulic fluid port is return opening, variable displacement pump assembly A hydraulic fluid port is oil outlet, can form an oil hydraulic circuit with each oil hydraulic motor, each logical valve.Now, because hydraulic oil is assigned to each oil hydraulic motor by each logical valve, the e mouth pressure of flow divider-combiner one, flow divider-combiner two is less, be not enough to impel the e mouth of flow divider-combiner one, flow divider-combiner two and f mouth, g mouth to connect, thus, under normal travelling state, flow divider-combiner one, flow divider-combiner two are in obstructed state.
When being in state of rolling backward, variable displacement pump assembly B hydraulic fluid port is oil outlet, and variable displacement pump assembly A hydraulic fluid port is return opening, and each oil hydraulic motor, each logical valve form an oil hydraulic circuit.
When vehicle travels on rough road surface or the higher ground of the gradient, vehicle is in differential state, the hydraulic pressure oil mass difference of four oil hydraulic motor distribution is larger, control panel gives the S3 coil electrical signal of differential lock solenoid valve, b mouth and the c mouth of differential lock solenoid valve are connected, because the c mouth of differential lock solenoid valve connects the connection oil circuit between all logical valves and variable displacement pump assembly A hydraulic fluid port, therefore, hydraulic oil can flow to b mouth from the c mouth of differential lock solenoid valve, the c mouth of each logical valve is opened, a mouth and the b mouth of each logical valve are in obstructed state, the hydraulic oil that variable displacement pump assembly A hydraulic fluid port pumps can flow directly to flow divider-combiner one, the e mouth of flow divider-combiner two, make flow divider-combiner one, the e mouth place of flow divider-combiner two produces enough pressure, flow divider-combiner one, the e mouth of flow divider-combiner two and f mouth, g mouth is connected, flow divider-combiner one can connect left front oil hydraulic motor, right front oil hydraulic motor, flow divider-combiner two can connect left back oil hydraulic motor, right back oil hydraulic motor, utilize flow divider-combiner can the characteristic of equal shunt volumes, thorough solution differential problem.
Compared with prior art, beneficial effect of the present invention is: each oil hydraulic motor adopts the mode be arranged in parallel, and can make each oil hydraulic motor operationally can Random assignment flow, thoroughly can solve the problem of differential; Even if when running into rough road surface or the higher ground of the gradient, can automatically switch oil circuit, makes hydraulic oil equivalent can distribute to each oil hydraulic motor, realize differential locking, have better passing ability.
As a further improvement on the present invention, described variable displacement pump assembly is provided with the A hydraulic fluid port of link variable pump assembly and the manual-operated emergent valve of B hydraulic fluid port, and when motor breaks down out of service, A hydraulic fluid port and the B hydraulic fluid port of variable displacement pump assembly are connected under the control of manual-operated emergent valve.The program when motor breaks down, can open manual-operated emergent valve, travels for dragging vehicle.
As a further improvement on the present invention, between the f mouth of described flow divider-combiner one, g mouth, connect differential throttle valve, between the g mouth of flow divider-combiner two, f mouth, also connect differential throttle valve.That hydraulic oil can all assign to each oil hydraulic motor in order under ensureing that vehicle is in differential situation further.
Accompanying drawing explanation
Fig. 1 is overall layout chart of the present invention.
Fig. 2 is working line figure of the present invention.
Wherein, 1 motor, 2 variable displacement pump assemblies, 2a manual-operated emergent valve, 3 hydraulic oil containers, 4 control panels, 5 differential lock solenoid valves, 6 first logical valves, 7 second logical valves, 8 the 3rd logical valves, 9 the 4th logical valves, 10 flow divider-combiners one, 11 flow divider-combiner two, 12 differential throttle valve, 13 left front oil hydraulic motors, 14 right front oil hydraulic motors, 15 left back oil hydraulic motors, 16 right back oil hydraulic motors.
Embodiment
As shown in Figure 1-2, small-sized full-hydraulic a11wheel drive road sweeper vibration hydraulic system, comprise motor 1, also comprise the variable displacement pump assembly 2, left front oil hydraulic motor 13, right front oil hydraulic motor 14, left back oil hydraulic motor 15, the right back oil hydraulic motor 16 that control by motor 1, left front oil hydraulic motor 13, right front oil hydraulic motor 14, left back oil hydraulic motor 15, right back oil hydraulic motor 16 are arranged in parallel.
This system also comprises and controls left front oil hydraulic motor 13 respectively, right front oil hydraulic motor 14, left back oil hydraulic motor 15, first logical valve 6 of right back oil hydraulic motor 16, second logical valve 7, 3rd logical valve 8, 4th logical valve 9, first logical valve 6, second logical valve 7, 3rd logical valve 8, the b mouth of the 4th logical valve 9 respectively with left front oil hydraulic motor 13, right front oil hydraulic motor 14, left back oil hydraulic motor 15, the A hydraulic fluid port of right back oil hydraulic motor 16 connects, first logical valve 6, second logical valve 7, 3rd logical valve 8, the a mouth of the 4th logical valve 9 is connected with the A hydraulic fluid port of variable displacement pump assembly 2.
Above-mentioned first logical valve 6, second logical valve 7, the 3rd logical valve 8, the c mouth of the 4th logical valve 9 are connected with the b mouth of differential lock solenoid valve 5, the a mouth of differential lock solenoid valve 5 connects hydraulic oil container 3, the c mouth of differential lock solenoid valve 5 connects the connection oil circuit between the A hydraulic fluid port of all logical valves and variable displacement pump assembly 2, and the S3 coil of differential lock solenoid valve 5 is connected by guide line with control panel 4.
The A hydraulic fluid port of above-mentioned left front oil hydraulic motor 13, right front oil hydraulic motor 14 is connected with the f mouth of flow divider-combiner 1, g mouth respectively.
The A hydraulic fluid port of above-mentioned left back oil hydraulic motor 15, right back oil hydraulic motor 16 is connected with the g mouth of flow divider-combiner 2 11, f mouth respectively.
The e mouth of above-mentioned flow divider-combiner 1, flow divider-combiner 2 11 is connected with the A hydraulic fluid port of variable displacement pump assembly 2; The B hydraulic fluid port of left front oil hydraulic motor 13, right front oil hydraulic motor 14, left back oil hydraulic motor 15, right back oil hydraulic motor 16 is connected with the B hydraulic fluid port of variable displacement pump assembly 2.
During normal vehicle operation, the b mouth of differential latching solenoid valve 5 and a mouth are connected; When vehicle produces differential, control panel 4 gives the S3 coil electrical signal of differential lock solenoid valve 5, and b mouth and the c mouth of differential lock solenoid valve 5 are connected.
Above-mentioned variable displacement pump assembly 2 is provided with the A hydraulic fluid port of link variable pump assembly 2 and the manual-operated emergent valve 2a of B hydraulic fluid port, and when motor 1 breaks down out of service, A hydraulic fluid port and the B hydraulic fluid port of variable displacement pump assembly 2 are connected under the control of manual-operated emergent valve 2a.
Connect differential throttle valve 12 between the f mouth of above-mentioned flow divider-combiner 1, g mouth, between the g mouth of flow divider-combiner 2 11, f mouth, also connect differential throttle valve 12.That hydraulic oil can all assign to each oil hydraulic motor in order under ensureing that vehicle is in differential situation further.
When being in normal travelling state, ato unit 1, the A hydraulic fluid port of variable displacement pump assembly 2 pumps hydraulic oil, the a mouth of the first logical valve 6, second logical valve 7, the 3rd logical valve 8, the 4th logical valve 9 is communicated with b mouth, now, the Leckage of all logical valves is by the c mouth of logical valve, the b mouth of differential lock solenoid valve 5 and a mouth hydraulic return fuel tank 3, hydraulic oil can enter left front oil hydraulic motor 13, right front oil hydraulic motor 14, left back oil hydraulic motor 15, the A hydraulic fluid port of right back oil hydraulic motor 16, thus drive left front oil hydraulic motor 13, right front oil hydraulic motor 14, left back oil hydraulic motor 15, right back oil hydraulic motor 16 rotates, left front oil hydraulic motor 13, right front oil hydraulic motor 14, left back oil hydraulic motor 15, the B hydraulic fluid port of right back oil hydraulic motor 16 is connected with the B hydraulic fluid port of variable displacement pump assembly 2, now, the B hydraulic fluid port of variable displacement pump assembly 2 is return opening, the A hydraulic fluid port of variable displacement pump assembly 2 is oil outlet, can with each oil hydraulic motor, each logical valve forms an oil hydraulic circuit.Now, because hydraulic oil is assigned to each oil hydraulic motor by each logical valve, the e mouth pressure of flow divider-combiner 1, flow divider-combiner 2 11 is less, be not enough to impel the e mouth of flow divider-combiner 1, flow divider-combiner 2 11 and f mouth, g mouth to connect, thus, under normal travelling state, flow divider-combiner 1, flow divider-combiner 2 11 are in obstructed state.
When being in state of rolling backward, the B hydraulic fluid port of variable displacement pump assembly 2 is oil outlet, and the A hydraulic fluid port of variable displacement pump assembly 2 is return opening, and each oil hydraulic motor, each logical valve form an oil hydraulic circuit.
When vehicle travels on rough road surface or the higher ground of the gradient, vehicle is in differential state, the hydraulic pressure oil mass difference of four oil hydraulic motor distribution is larger, control panel 4 gives the S3 coil electrical signal of differential lock solenoid valve 5, b mouth and the c mouth of differential lock solenoid valve 5 are connected, because the c mouth of differential lock solenoid valve 5 connects the connection oil circuit between the A hydraulic fluid port of all logical valves and variable displacement pump assembly 2, therefore, hydraulic oil can flow to b mouth from the c mouth of differential lock solenoid valve 5, the c mouth of each logical valve is opened, a mouth and the b mouth of each logical valve are in obstructed state, the hydraulic oil that the A hydraulic fluid port of variable displacement pump assembly 2 pumps can flow directly to flow divider-combiner 1, the e mouth of flow divider-combiner 2 11, make flow divider-combiner 1, the e mouth place of flow divider-combiner 2 11 produces enough pressure, flow divider-combiner 1, the e mouth of flow divider-combiner 2 11 and f mouth, g mouth is connected, flow divider-combiner 1 can connect left front oil hydraulic motor 13, right front oil hydraulic motor 14, flow divider-combiner 2 11 can connect left back oil hydraulic motor 15, right back oil hydraulic motor 16, utilize flow divider-combiner can the characteristic of equal shunt volumes, thorough solution differential problem.
The present invention is not limited to above-described embodiment; on the basis of technological scheme disclosed by the invention; those skilled in the art is according to disclosed technology contents; do not need performing creative labour just can make some to some technical characteristicss wherein to replace and distortion, these are replaced and are out of shape all in protection scope of the present invention.

Claims (3)

1. small-sized full-hydraulic a11wheel drive road sweeper vibration hydraulic system, comprise motor (1), also comprise the variable displacement pump assembly (2) controlled by motor (1), left front oil hydraulic motor (13), right front oil hydraulic motor (14), left back oil hydraulic motor (15), right back oil hydraulic motor (16), it is characterized in that:
Described left front oil hydraulic motor (13), right front oil hydraulic motor (14), left back oil hydraulic motor (15), right back oil hydraulic motor (16) are arranged in parallel;
This system also comprises and controls left front oil hydraulic motor (13) respectively, right front oil hydraulic motor (14), left back oil hydraulic motor (15), first logical valve (6) of right back oil hydraulic motor (16), second logical valve (7), 3rd logical valve (8), 4th logical valve (9), described first logical valve (6), second logical valve (7), 3rd logical valve (8), the b mouth of the 4th logical valve (9) respectively with left front oil hydraulic motor (13), right front oil hydraulic motor (14), left back oil hydraulic motor (15), the A hydraulic fluid port of right back oil hydraulic motor (16) connects, described first logical valve (6), second logical valve (7), 3rd logical valve (8), the a mouth of the 4th logical valve (9) is connected with variable displacement pump assembly (2) A hydraulic fluid port,
The c mouth of described first logical valve (6), the second logical valve (7), the 3rd logical valve (8), the 4th logical valve (9) is connected with the b mouth of differential lock solenoid valve (5), the a mouth of described differential lock solenoid valve (5) connects hydraulic oil container (3), the c mouth of described differential lock solenoid valve (5) connects the connection oil circuit between all logical valves and variable displacement pump assembly (2) A hydraulic fluid port, and the S3 coil of described differential lock solenoid valve (5) is connected by guide line with control panel (4);
The A hydraulic fluid port of described left front oil hydraulic motor (13), right front oil hydraulic motor (14) is connected with the f mouth of flow divider-combiner one (10), g mouth respectively;
The A hydraulic fluid port of described left back oil hydraulic motor (15), right back oil hydraulic motor (16) is connected with the g mouth of flow divider-combiner two (11), f mouth respectively;
The e mouth of described flow divider-combiner one (10), flow divider-combiner two (11) is connected with variable displacement pump assembly (2) A hydraulic fluid port;
The B hydraulic fluid port of described left front oil hydraulic motor (13), right front oil hydraulic motor (14), left back oil hydraulic motor (15), right back oil hydraulic motor (16) is connected with variable displacement pump assembly (2) B hydraulic fluid port;
During normal vehicle operation, the b mouth of differential latching solenoid valve (5) and a mouth are connected;
When vehicle produces differential, described control panel (4) gives the S3 coil electrical signal of differential lock solenoid valve (5), and b mouth and the c mouth of described differential lock solenoid valve (5) are connected.
2. small-sized full-hydraulic a11wheel drive road sweeper vibration hydraulic system according to claim 1, it is characterized in that: described variable displacement pump assembly (2) is provided with the A hydraulic fluid port of link variable pump assembly (2) and the manual-operated emergent valve (2a) of B hydraulic fluid port, when motor (1) breaks down out of service, A hydraulic fluid port and the B hydraulic fluid port of variable displacement pump assembly (2) are connected under the control of manual-operated emergent valve (2a).
3. small-sized full-hydraulic a11wheel drive road sweeper vibration hydraulic system according to claim 1, it is characterized in that: between the f mouth of described flow divider-combiner one (10), g mouth, connect differential throttle valve (12), between the g mouth of flow divider-combiner two (11), f mouth, also connect differential throttle valve (12).
CN201510066145.6A 2015-02-09 2015-02-09 Small-sized full-hydraulic a11wheel drive road sweeper vibration hydraulic system Active CN104675768B (en)

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CN105799502A (en) * 2016-04-29 2016-07-27 徐州徐工环境技术有限公司 Full hydraulic drive street sweeper walking differential speed switching device
CN106837903A (en) * 2016-12-14 2017-06-13 湖北合加环境设备有限公司 A kind of small four-wheel hydraulic-driven Multifunction outdoor Operation Van walking closed type hydraulic system
CN107218268A (en) * 2017-05-19 2017-09-29 广西柳工机械股份有限公司 Land leveller front wheel driven hydraulic system
CN108138805A (en) * 2016-07-29 2018-06-08 株式会社小松制作所 Control system, Work machine and control method
CN109249801A (en) * 2018-09-22 2019-01-22 江苏悦达专用车有限公司 A kind of hydrostatic low speed running gear
CN110744999A (en) * 2019-10-28 2020-02-04 韩国昊 Hydraulic differential control system for vehicle
CN111022436A (en) * 2019-12-06 2020-04-17 中联重科股份有限公司 Hydraulic drive system and aerial working equipment

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CN202378697U (en) * 2011-12-20 2012-08-15 徐州重型机械有限公司 Travel hydraulic control system and self-propelled engineering machinery applying such control system
CN103434393A (en) * 2013-08-13 2013-12-11 福建龙马环卫装备股份有限公司 Walking hydraulic system of mini full hydraulic drive road sweeper

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Publication number Priority date Publication date Assignee Title
CN105799502A (en) * 2016-04-29 2016-07-27 徐州徐工环境技术有限公司 Full hydraulic drive street sweeper walking differential speed switching device
CN105799502B (en) * 2016-04-29 2018-01-09 徐州徐工环境技术有限公司 A kind of all-hydraulic-driven road sweeper walking differential switching device
CN108138805B (en) * 2016-07-29 2020-02-11 株式会社小松制作所 Control system, work machine, and control method
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CN106837903A (en) * 2016-12-14 2017-06-13 湖北合加环境设备有限公司 A kind of small four-wheel hydraulic-driven Multifunction outdoor Operation Van walking closed type hydraulic system
CN107218268A (en) * 2017-05-19 2017-09-29 广西柳工机械股份有限公司 Land leveller front wheel driven hydraulic system
CN109249801A (en) * 2018-09-22 2019-01-22 江苏悦达专用车有限公司 A kind of hydrostatic low speed running gear
CN110744999A (en) * 2019-10-28 2020-02-04 韩国昊 Hydraulic differential control system for vehicle
CN111022436A (en) * 2019-12-06 2020-04-17 中联重科股份有限公司 Hydraulic drive system and aerial working equipment

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Application publication date: 20150603

Assignee: Yangzhou Jinwei Machinery Co., Ltd.

Assignor: Yangzhou Jin Wei Environmental Protection Technology Co., Ltd

Contract record no.: 2018320000031

Denomination of invention: Walking hydraulic system for small all-hydraulic all-wheel drive road sweeper

Granted publication date: 20160817

License type: Common License

Record date: 20180228