CN102261107A - Infinitely variable speed control system for wheel type hydraulic excavator - Google Patents

Infinitely variable speed control system for wheel type hydraulic excavator Download PDF

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Publication number
CN102261107A
CN102261107A CN2011101401301A CN201110140130A CN102261107A CN 102261107 A CN102261107 A CN 102261107A CN 2011101401301 A CN2011101401301 A CN 2011101401301A CN 201110140130 A CN201110140130 A CN 201110140130A CN 102261107 A CN102261107 A CN 102261107A
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China
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valve
oil
pilot valve
control
communicated
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CN2011101401301A
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CN102261107B (en
Inventor
刘斌
冉光宇
熊昌强
胡平
董则厚
唐发
杨杰
李新发
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Guizhou Jonyang Kinetics Co Ltd
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Guizhou Jonyang Kinetics Co Ltd
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Abstract

The invention discloses an infinitely variable speed control system for a wheel type hydraulic excavator, belonging to a travelling variable speed control system for construction machinery. The invention aims to provide a wheel type travelling variable speed control system which can carry out shift operation without parking. The system comprises a control part and an execution part, wherein the control part comprises a pilot pump (14), a control accelerator (18), a shuttle valve (1), a reserving valve (12) and five manual pilot valves; and the execution part comprises a main pump (12), a main valve (2), two control valves, four hydraulic motors, a second shuttle valve (5), a parking cylinder (3) and a four-wheel driving cylinder (4). The system realizes infinitely variable speed of vehicle travelling, dispenses with stopping for gear shifting, has short gear shifting response time and high reliability, is synchronous with no shock, has the advantages of simple structure, convenience in operation and maintenance and the like and is ideal for the wheel type hydraulic excavator.

Description

Wheeled hydraulic excavator infinitely variable speeds control system
Technical field: the present invention relates to a kind of engineering machinery walking change control system, relate in particular to a kind of Thomas who is used for hydraulic wheel excavator and reach walking infinitely variable speeds control system.
Background technology: well-known, wheeled excavator all must stop earlier usually and just can carry out gear shift operation at present, not only there are defectives such as gearshift bothers, the gearshift response time is long, mobility is relatively poor, and travel speed generally has only 30 kilometers/hour, can not adapt to the needs of current engineering machinery development.
Summary of the invention: in order to overcome the defective that exists in the prior art, the present invention aims to provide the wheeled hydraulic excavator infinitely variable speeds control system that a kind of dispense with parking can carry out gear shift operation.
To achieve these goals, the present invention by the following technical solutions: it comprises control section and operating part; It is characterized in that: described control section is by pioneer pump, three blocks move pilot valve, the control throttle, manual pilot valve reverses gear, two blocks move pilot valve, one block moves pilot valve, the manual pilot valve of parking braking, and first shuttle valve and reversal valve constitute, wherein, pioneer pump moves the oil-in of pilot valve respectively with three blocks, the oil-in of the manual pilot valve of parking braking is communicated with, the oil-out of the moving pilot valve of three blocks respectively with the control throttle, manual pilot valve reverses gear, two blocks move pilot valve, and the oil-in of the moving pilot valve of a block is communicated with, the oil-out of manual pilot valve of reversing gear is communicated with the hydraulic control end of reversal valve, the oil-in of this reversal valve is communicated with the oil-out of control throttle, and first shuttle valve is connected between the oil-out of reverse gear manual pilot valve and the moving pilot valve of a block; Described operating part is by main pump, the main valve that is communicated with this main pump, first control valve that is communicated with this main valve again after the parallel connection and second control valve, first hydraulic motor and second hydraulic motor by the series connection of first control valve, the 3rd hydraulic motor and the 4th hydraulic motor by the series connection of second control valve, be connected on second shuttle valve between the moving pilot valve hydraulic fluid port sum first shuttle valve oil-out of two blocks, the Parking oil cylinder that is communicated with the oil-out of the manual pilot valve of parking braking, the four-wheel drive oil cylinder that is communicated with the first shuttle valve oil-out constitutes, wherein, the hydraulic control end of first control valve is communicated with the oil-out of second shuttle valve, and the hydraulic control end of second control valve is communicated with the oil-out of first shuttle valve.
Between pioneer pump and moving pilot valve of three blocks and the manual pilot valve of parking braking, be provided with one way valve.
Compared with the prior art, the present invention is owing to adopted technique scheme, and vehicle can be selected gear according to pavement behavior, has realized the infinitely variable speeds of vehicle to run; Not only dispense with parking gearshift of the present invention, and the gearshift response time is short, reliability is high, synchronous nothing is impacted, and has plurality of advantages such as simple in structure, that Operation and maintenance are convenient.
Description of drawings:
Fig. 1 is a control principle schematic diagram of the present invention.
Among the figure: the moving pilot valve 17 control throttles 18 of first shuttle valve, 1 main valve, 2 Parking oil cylinders, 3 four-wheel drive oil cylinders, 4 second shuttle valves, 5 first hydraulic motors, 6 first control valves 7 the 3rd hydraulic motor, 8 second control valves 9 the 4th hydraulic motor, 10 second hydraulic motors, 11 reversal valves, 12 main pumps, 13 pioneer pumps, 14 fuel tanks, 15 one way valves, the 16 3 blocks moving manual pilot valve 22 of pilot valve 21 parking brakings of moving pilot valve 20 1 blocks of manual pilot valve 19 2 blocks that reverses gear
The specific embodiment: the invention will be further described below in conjunction with accompanying drawing and specific embodiment:
As shown in Figure 1: control section is made of pioneer pump 14, the moving pilot valve 17 of three blocks, control throttle 18, the manual pilot valve 19 that reverses gear, the moving pilot valve 20 of two blocks, the moving pilot valve 21 of a block, the manual pilot valve 22 of parking braking and first shuttle valve 1 and reversal valve 12.Wherein, the oil-in of the moving pilot valve 17 of three blocks, the oil-in of the manual pilot valve 22 of parking braking is connected in parallel on the output of pioneer pump 14 respectively by oil pipe, the oil-in of control throttle 18, the oil-in of manual pilot valve 19 reverses gear, the oil-in of the oil-in of the moving pilot valve 20 of two blocks and the moving pilot valve 21 of a block is connected in parallel on the oil-out of the moving pilot valve 17 of three blocks respectively by oil pipe, the hydraulic control end of reversal valve 12 is communicated with by the oil-out of oil pipe with the manual pilot valve 19 that reverses gear, and the oil-in at first shuttle valve, 1 two ends moves between the oil-out of pilot valve 21 by an oil-out and the block that oil pipe is connected on the manual pilot valve 19 that reverses gear; The oil-in of reversal valve 12 is communicated with the oil-out of control throttle 18, and the oil return opening of the oil return opening of the oil return opening of this reversal valve, the oil return opening of the moving pilot valve 17 of three blocks, the manual pilot valve 19 that reverses gear, the oil return opening of the moving pilot valve 20 of two blocks and the moving pilot valve 21 of a block is communicated with fuel tank 15 by oil pipe.Operating part is by main pump 13, the main valve 2 that oil-in is communicated with the port of export of this main pump by oil pipe, by oil pipe will be separately P hydraulic fluid port and T hydraulic fluid port first control valve 7 and second control valve 9 that are connected in parallel on this main valve A hydraulic fluid port and B oil port respectively, be connected on the C hydraulic fluid port of first control valve 7 and first hydraulic motor 6 of D oil port, be connected on that the A hydraulic fluid port of this first control valve and B oil port are connected with first hydraulic motor 6 and second hydraulic motor 11 that forms the loop, be connected on the C hydraulic fluid port of second control valve 9 and the 3rd hydraulic motor 8 of D oil port, be connected on that the A hydraulic fluid port of this second control valve and B oil port are connected with the 3rd hydraulic motor 8 and the 4th hydraulic motor 10 that forms the loop, the two ends oil-in is connected on second shuttle valve 5 between moving pilot valve 20 of two blocks and first shuttle valve, 1 oil-out by oil pipe, the Parking oil cylinder 3 that is communicated with by manual pilot valve 22 oil-outs of oil pipe and parking braking, the four-wheel drive oil cylinder 4 that is communicated with first shuttle valve, 1 oil-out by oil pipe constitutes.Wherein, the hydraulic control end of first control valve 7 is communicated with by the oil-out of oil pipe with second shuttle valve 5, the hydraulic control end of second control valve 9 is communicated with by the oil-out of oil pipe with first shuttle valve 1, two hydraulic control ends of main valve 2 are communicated with reversal valve 12 by oil pipe respectively, and the oil return opening of this main valve is communicated with fuel tank 15 by oil pipe.
For the ease of control, be provided with one way valve 16 between the oil-out of the oil-in of the moving pilot valve 17 of three blocks and the oil-in of the manual pilot valve 22 of parking braking and pioneer pump 14.
In the above-described embodiments, main valve 2 is three eight logical pilot operated valve device, the reverse gear moving pilot valve 21 of manual pilot valve 19, a block, the moving pilot valve 20 of two blocks, the moving pilot valve 17 of three blocks, the moving pilot valve 22 of parking braking block is two-position three-way valve, reversal valve 12 is two four-way pilot operated directional control valves, and first control valve 7 and second control valve 9 are two six logical pilot operated valve device.
Operating principle:
When the manual pilot valve 22 of parking braking was in disconnection, machine was in the parking braking state.
When the moving pilot valve 17 of three blocks is in disconnection, there is not the walking action even if step on control throttle 18 machines yet, be in the neutral state.
Connect when the manual pilot valve 22 of parking braking, remove parking braking; The moving pilot valve 17 of manual pilot valve 19 and three blocks that reverses gear is simultaneously connected, and the control end that the servo oil that reverses gear enters reversal valve 12 makes main valve 2 commutations, each hydraulic motor counter-rotating; Simultaneously, the servo oil that reverses gear enters the control end of first control valve 7 and second control valve 9 by first shuttle valve 1, second shuttle valve 5, make four described hydraulic motors of its control participate in together driving, the servo oil that reverses gear simultaneously also enters four-wheel drive oil cylinder 4, realizes the four-wheel connection; At this moment it is in running order to have four hydraulic motors, and forward and backward bridge obtains driving simultaneously, and machine is in the reversing state.
Connect when the manual pilot valve 22 of parking braking, remove parking braking; The moving pilot valve 17 of moving pilot valve 21 of a block and three blocks is connected simultaneously, the servo oil of one retaining enters the control end of first control valve 7 and second control valve 9 by first shuttle valve 1, second shuttle valve 5, make four described hydraulic motors of its control participate in together driving, the servo oil that reverses gear simultaneously also enters four-wheel drive oil cylinder 4, the realization four-wheel is connected, at this moment it is in running order to have four hydraulic motors, and forward and backward bridge obtains driving simultaneously; Machine is in a retaining starting transport condition.
Connect when the manual pilot valve 22 of parking braking, remove parking braking; The moving pilot valve 17 of moving pilot valve 20 of two blocks and three blocks is connected simultaneously, and the servo oil of two retainings enters the control end of first shuttle valve 1, first control valve 7, makes second hydraulic motor 11, the 4th hydraulic motor 10 and first hydraulic motor 6 of its control participate in driving; It is in running order that have three hydraulic motors this moment, and machine is in two retaining starting transport conditions.
Connect when the manual pilot valve 22 of parking braking, remove parking braking; The moving pilot valve 17 of three blocks is connected simultaneously, only has second hydraulic motor 11, the 4th hydraulic motor 10 to participate in driving, and it is in running order that have two hydraulic motors this moment; Machine is in three retaining transport conditions.

Claims (2)

1. a wheeled hydraulic excavator infinitely variable speeds control system comprises control section and operating part; It is characterized in that: described control section is by pioneer pump (14), three blocks move pilot valve (17), control throttle (18), manual pilot valve (19) reverses gear, two blocks move pilot valve (20), one block moves pilot valve (21), the manual pilot valve of parking braking (22), and first shuttle valve (1) and reversal valve (12) constitute, wherein, pioneer pump (14) moves the oil-in of pilot valve (17) respectively with three blocks, the oil-in of the manual pilot valve of parking braking (22) is communicated with, the oil-out that three blocks move pilot valve (17) respectively with control throttle (18), manual pilot valve (19) reverses gear, two blocks move pilot valve (20), and the oil-in of the moving pilot valve (21) of a block is communicated with, the oil-out of manual pilot valve (19) of reversing gear is communicated with the hydraulic control end of reversal valve (12), the oil-in of this reversal valve is communicated with the oil-out of control throttle (18), and first shuttle valve (1) is connected between the oil-out of reverse gear manual pilot valve (19) and the moving pilot valve (21) of a block; Described operating part is by main pump (13), the main valve (2) that is communicated with this main pump, first control valve (7) that is communicated with this main valve again after the parallel connection and second control valve (9), first hydraulic motor (6) and second hydraulic motor (11) by first control valve (7) series connection, the 3rd hydraulic motor (8) and the 4th hydraulic motor (10) by second control valve (9) series connection, be connected on second shuttle valve (5) between moving pilot valve (20) oil-out of two blocks and first shuttle valve (1) oil-out, the Parking oil cylinder (3) that is communicated with the oil-out of the manual pilot valve of parking braking (22), the four-wheel drive oil cylinder (4) that is communicated with first shuttle valve (1) oil-out constitutes, wherein, the hydraulic control end of first control valve (7) is communicated with the oil-out of second shuttle valve (5), and the hydraulic control end of second control valve (9) is communicated with the oil-out of first shuttle valve (1).
2. wheeled hydraulic excavator infinitely variable speeds control system according to claim 1 is characterized in that: be provided with one way valve (16) between pioneer pump (14) and moving pilot valve (17) of three blocks and the manual pilot valve of parking braking (22).
CN 201110140130 2011-05-27 2011-05-27 Infinitely variable speed control system for wheel type hydraulic excavator Active CN102261107B (en)

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104179736A (en) * 2014-08-15 2014-12-03 徐工集团工程机械股份有限公司科技分公司 Speed-governing hydraulic system for engineering mechanical fixed displacement pump

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2102953U (en) * 1990-09-15 1992-04-29 沈太福 Tyre type electric stepless speed regulation excavater
JPH0913428A (en) * 1995-06-30 1997-01-14 Kubota Corp Traveling speed change structure of wheel loader
CN201087437Y (en) * 2007-08-29 2008-07-16 泰安市泰山工程机械股份有限公司 Hydraulic power-shift novel full hydraulic wheeled excavator
US20090139224A1 (en) * 2005-07-22 2009-06-04 Naoki Ishizaki Device and method of continuously variable transmission of traveling vehicle
CN201771014U (en) * 2010-08-04 2011-03-23 贵州詹阳动力重工有限公司 Tire type hydraulic excavator traveling automatic speed changing device
CN202148554U (en) * 2011-05-27 2012-02-22 贵州詹阳动力重工有限公司 Stepless speed change control system for wheel type hydraulic excavator

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2102953U (en) * 1990-09-15 1992-04-29 沈太福 Tyre type electric stepless speed regulation excavater
JPH0913428A (en) * 1995-06-30 1997-01-14 Kubota Corp Traveling speed change structure of wheel loader
US20090139224A1 (en) * 2005-07-22 2009-06-04 Naoki Ishizaki Device and method of continuously variable transmission of traveling vehicle
CN201087437Y (en) * 2007-08-29 2008-07-16 泰安市泰山工程机械股份有限公司 Hydraulic power-shift novel full hydraulic wheeled excavator
CN201771014U (en) * 2010-08-04 2011-03-23 贵州詹阳动力重工有限公司 Tire type hydraulic excavator traveling automatic speed changing device
CN202148554U (en) * 2011-05-27 2012-02-22 贵州詹阳动力重工有限公司 Stepless speed change control system for wheel type hydraulic excavator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104179736A (en) * 2014-08-15 2014-12-03 徐工集团工程机械股份有限公司科技分公司 Speed-governing hydraulic system for engineering mechanical fixed displacement pump
CN104179736B (en) * 2014-08-15 2016-08-24 徐工集团工程机械股份有限公司科技分公司 A kind of engineering machinery constant displacement pump speed-regulating hydraulic system

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