CN1007078B - Control device for hydraulic motor - Google Patents
Control device for hydraulic motorInfo
- Publication number
- CN1007078B CN1007078B CN 85108834 CN85108834A CN1007078B CN 1007078 B CN1007078 B CN 1007078B CN 85108834 CN85108834 CN 85108834 CN 85108834 A CN85108834 A CN 85108834A CN 1007078 B CN1007078 B CN 1007078B
- Authority
- CN
- China
- Prior art keywords
- valve
- mentioned
- hydraulic motor
- oil hydraulic
- flow body
- 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.)
- Expired
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- Fluid-Pressure Circuits (AREA)
Abstract
The present invention relates to a control device for a hydraulic motor for a hydraulic drive construction vehicle, which is provided with a hydraulic motor, a pump supplied with pressure fluid, a manual directional control valve and a selector valve, wherein the manual directional control valve bridges a supply device of the hydraulic motor and a discharge duct; the selector valve comprises a balance valve which bridges an extensible duct between the directional control valve and the hydraulic motor, a pair of brake valve plates arranged in a spill valve, and a discharge capacity control cylinder which is used for controlling introduction of a fusiform valve which forms bridge connection with the duct and contained in the hydraulic motor, and the selector valve is used for controlling supply of the pressure fluid. The selector valve is in a guide control type, and is controlled in a remote mode by guide pressure fluid supplied by a pressure fluid source of the outside.
Description
The present invention relates to the improvement in the control device for hydraulic motor of main walking drive motor as the construction vehicle that drives by hydraulic transmission.
Walking drive motor as for hydraulic drive type construction vehicle such as revolving shovel adopts the variable displacement hydraulic motor up to now, so that can change the speed of a motor vehicle at any time.This kind oil hydraulic motor was once arranged like this, so that can control its rotating speed by the inclination angle that changes its inclined shaft or swash plate.
In order to change the inclination angle of swash plate, a discharge capacity control cylinder that is included in the oil hydraulic motor is driven.For reaching this purpose, adopted two kinds of systems, a kind of just like Japanese Utility Model self control pressurer system described in 59-7647 number is disclosed, the pressure that wherein drives oil hydraulic motor directly infeeds the discharge capacity control cylinder, another kind has the pilot pressure control system, and the pressure flow body of the pressure flow body supply source that wherein comes from the outside infeeds the discharge capacity control cylinder.
The advantage of the control gear of self control pressurer system is that the number and its boundary dimension of the outer conduit that links to each other with it can reduce, and need keep than higher but shortcoming is to be used for to drive the hydrodynamic pressure of oil hydraulic motor.For example, when the vehicle descending of self pressure control type control gear that oil hydraulic motor is housed, engine speed reduces, and it is smaller to infeed the pressure flow scale of construction of oil hydraulic motor from pressure flow body supply source.Thereby oil hydraulic motor is by the deadweight reverse direction actuation of vehicle, thereby causes that pump efficiency should.As a result, the hydrodynamic pressure that is connected in the loop between pressure flow body supply source and the oil hydraulic motor reduces.And simultaneously, because the effect of equilibrium valve itself is to the throttling of the Fluid Volume of discharging from oil hydraulic motor, oil hydraulic motor is discharged side and is contained in hydrodynamic pressure in the loop between the interior equilibrium valve of hydraulic braking valve block and but keeps to such an extent that relatively be higher than the pressure of supply side.Under this operating mode, take from loop between pressure flow body supply source and the oil hydraulic motor if infeed the pressure flow body of the discharge capacity control cylinder of oil hydraulic motor, then the pressure in this loop is so low, so that when the vehicle descending, can not control by the discharge capacity control cylinder by operated selector valve, so cause the discharge capacity control fails of oil hydraulic motor.
Simultaneously, the come from the outside press liquid that has of pressure flow body supply source of the pilot pressure controlling type control gear utilization of oil hydraulic motor, do not have above-mentioned such shortcoming, but its shortcoming is to need to increase the number of the outer conduit that links to each other with it, and the increasing of its boundary dimension is inevitable.
Device among another day patent documentation JP57-205637 of the present disclosure, when vehicle low speed ran, the operation pressure of oil hydraulic motor under low pressure was relaxed by the fusiformis valve; On the other hand, when vehicle ran at a high speed, selector valve was changed by the effect of the pilot pressure in guide's conduit, and therefore, operation pressure under high pressure is relaxed.
Another shortcoming of traditional control device for hydraulic motor is, owing to come controlling packet to be contained in discharge capacity control cylinder in the oil hydraulic motor with manual selector valve, thus concerning operator, need difficult operation, and its service behaviour step-down.
The present invention is intended to eliminate the above-mentioned shortcoming of prior art control device for hydraulic motor, its objective is provides a kind of control device for hydraulic motor, wherein provide a selector valve to control the supply of pressure-controlled fluid, this control fluid is introduced the discharge capacity control cylinder that is included in the oil hydraulic motor from the conduit that is connected between pressure flow body supply source and the oil hydraulic motor through a fusiformis valve, and this selector valve can be by the pilot fluid pressure remote control of being supplied with by an extraneous pressure flow body supply source, need be by operator's manually-operable.Control device for hydraulic motor according to the invention significantly improves its service behaviour, and makes the number of the outer conduit that is connected with it compare remarkable minimizing with traditional pilot pressure controlling type control gear, and the size of control gear itself also significantly reduces.
In the purpose of the present invention, when vehicle low speed ran, the hydraulic pressure pressure flow body of high pressure was introduced the discharge capacity control cylinder by the fusiformis valve; On the other hand, when vehicle ran at a high speed, selector valve was changed by the effect of the pilot pressure in the pilot fluid conduit, made control cylinder overcome the bias force of pressure spring and moved, thereby reduce the capacity of oil hydraulic motor.
For achieving the above object, according to the present invention, a kind of control device for hydraulic motor that is used for by the construction vehicle of hydraulic transmission driving is provided, its composition comprises an oil hydraulic motor that is connected in the road wheel of vehicle, one is used as pressure flow body supply source so that hydraulic fluid is infeeded the oil hydraulic pump of above-mentioned oil hydraulic motor, cross-over connection in the supply of between oil hydraulic motor and pressure flow body supply source, extending with discharge conduit can be manual position control valve, a cross-over connection is in the braking valve unit of the above-mentioned conduit that extends between position control valve and oil hydraulic motor, above-mentioned braking valve unit comprises an equilibrium valve and two relief valves, and one be suitable for controlling through cross-over connection and introduce the selector valve of the supply of the control pressure flow body that is included in the discharge capacity control cylinder in the oil hydraulic motor in the fusiformis valve of above-mentioned conduit, its characteristics are that above-mentioned selector valve is the valve of pilot pressure operation, and it can be by guide's pressure flow body remote control of being supplied with through the pilot fluid conduit by an extraneous pressure flow body supply source.
In addition, in above-mentioned control device for hydraulic motor according to the invention, can on the conduit between position control valve and the equilibrium valve, perhaps on the conduit between braking valve unit and the oil hydraulic motor, provide a fusiformis valve.Under latter event, if it is very low to drive the hydrodynamic pressure of oil hydraulic motor, then the pressure flow body of oil hydraulic motor discharge side directly infeeds the discharge capacity control cylinder.Thereby the control fails of discharge capacity control cylinder can eliminate, and the shortcoming of self pressure control type oil hydraulic motor control gear above-mentioned also can be eliminated.
By consulting following explanation and the accompanying drawing that wherein embodies the optimum structure embodiment of principle of the present invention with the explanation of diagram example, above-mentioned advantage of the present invention and many other advantages, characteristics and subsidiary purpose will become clearly for being familiar with these professional personnel.
Fig. 1 is the embodiment's of an expression oil hydraulic motor control gear according to the invention total loop schematic diagram;
Fig. 2 is the local amplification view that expression is included in the selector valve of interior discharge capacity control cylinder of oil hydraulic motor and control discharge capacity control cylinder; And
Fig. 3 is another embodiment's of an expression oil hydraulic motor control gear according to the invention total loop schematic diagram.
Contrast Fig. 1 and 2 introduces one embodiment of the present of invention in detail below.In Fig. 1, label (1) representative is as an oil hydraulic pump of pressure flow body supply source.The pressure flow body of being discharged by oil hydraulic pump (1) infeeds manual position control valve (3) through conduit (2), the pressure flow body from this back warp fusiformis valve (13), equilibrium valve (4) and relief valve (5a) and (5b) infeeds oil hydraulic motor (6), drives such as the load (7) with working appliance that oil hydraulic motor (6) is connected by its.Equilibrium valve (4) constitutes a braking valve block with relief valve (5a), (5b).Above-mentioned oil hydraulic motor (6) is a variable displacement, has the discharge capacity control cylinder (8) at the inclination angle of the inclined shaft that is used for controlling it or swash plate.Assembling piston (10) in the discharge capacity control cylinder slidably, it is compressed the direction biasing that spring (9) strengthens along the discharge capacity that makes oil hydraulic motor.Moreover the inside of discharge capacity control cylinder (8) is separated into pressure chamber (8 by piston (10)
1) and (8
2).The pressure chamber (8 of downside
1) can supply with by guide's pressure flow body, this fluid is supplied with through solenoid electric valve (14) and guide's conduit (11) by extraneous pressure flow body supply source (16).And simultaneously, the pressure chamber (8 of offside
2) supply with by control pressure flow body, this fluid is by the connection position (12 of fusiformis valve (13) through pilot operated selector valve (12)
1) supply with.
Above-mentioned pilot operated selector valve (12) is comprised in the discharge capacity control cylinder (8), as shown in Figure 2.Arrange like this, promptly infeed pressure chamber (8 through solenoid electric valve (14)
1) the part of guide's pressure flow body can flow to pressure chamber (12b) through hydraulic fluid port (12a), the bias force that overcomes spring (12d) is whereby pushed spool (12c) to a left side, the connection position (12 of selector valve (12) from it
1) switch to its drainage locations (12
2), thereby make pressure chamber (8
2) in pressure flow body earial drainage advance earial drainage conduit (15).
Introduce the working principle of control gear below.
When manual position control valve (3) switches, for example from its neutral position (3
1) to its walking position (3
2) so that when driving the load (7) link to each other with oil hydraulic motor, will flow to oil hydraulic motor (6) through fusiformis valve (13) and equilibrium valve (4) by the pressure flow body of oil hydraulic pump (1) supply, the latter is rotated and drive load (7).Meanwhile, the part of the pressure flow body of being supplied with by oil hydraulic pump (1) will be through the connection position (12 of fusiformis valve (13) and pilot operated selector valve (12)
1) flow to discharge capacity control cylinder (8) bar side pressure chamber (8 arranged
2), increase the discharge capacity of oil hydraulic motor (6) whereby.Opened by remote control afterwards so that guide's pressure flow body is when infeeding pilot fluid conduit (11) when solenoid electric valve (14), pilot fluid is infeeded the pressure chamber (8 of discharge capacity control cylinder (8)
1).Meanwhile, by the effect of the pressure flow body of the pressure chamber (12b) of introducing pilot operated selector valve (12), (12c) shifts drainage locations (12 left onto the spool of selector valve (12)
2), thereby make pressure chamber (8
2) guide's pressure flow body of side is through drainage locations (12
2) earial drainage advances earial drainage conduit (15).As a result, the bias force that piston (10) overcomes pressure spring (9) moves, thereby reduces the discharge capacity of oil hydraulic motor (6).
Moreover under the very little situation of Fluid Volume that oil hydraulic pump (1) is supplied with, promptly when the vehicle descending and oil hydraulic motor (6) during by the deadweight reverse direction actuation of vehicle, pilot operated selector valve (12) is switched to its connection position (12 by remote control
1), so that the pressure flow body that oil hydraulic motor (6) is discharged can infeed the pressure chamber (8 of discharge capacity control cylinder (8) through fusiformis valve (13) and selector valve (12)
2).Thereby, can eliminate this class shortcoming of discharge capacity control fails of oil hydraulic motor (6) when the vehicle descending.
Represent an alternative embodiment of the invention among Fig. 3, fusiformis valve (13) cross-over connection that wherein is used for control pressure flow body is infeeded pilot operated selector valve (12) is in the supplying duct and the discharge conduit that extend between the relief valve (5a) of oil hydraulic motor (6) and braking valve block, (5b).
Be appreciated that the above only relates to the most preferred embodiment of invention, and attempt to comprise all conversion and the improvement of the example of selecting for purposes of this disclosure here, they do not constitute the disengaging to spirit of the present invention and scope.
Claims (2)
1, a kind of control device for hydraulic motor includes:
(a) oil hydraulic motor that is connected with the road wheel of vehicle,
(b) one is used as oil hydraulic pump from the pressure flow body supply source of hydraulic fluid to above-mentioned oil hydraulic motor that supply with,
(c) cross-over connection is in the supplying duct that extends between above-mentioned oil hydraulic motor and above-mentioned pressure flow body supply source with discharge the manual position control valve of conduit,
(d) cross-over connection is in the braking valve unit of the above-mentioned conduit that extends between above-mentioned position control valve and above-mentioned oil hydraulic motor, and above-mentioned braking valve unit comprises an equilibrium valve and two relief valves,
(e) one is suitable for controlling through cross-over connection and introduces the selector valve of the supply of the control pressure flow body that is included in the discharge capacity control cylinder in the oil hydraulic motor in the fusiformis valve of above-mentioned conduit,
(f) the above-mentioned pilot fluid conduit that is used for the guide's pressure flow body of pressure flow body supply source of coming from the outside is infeeded the selector valve of above-mentioned pilot pressure operation links to each other with the downside pressure chamber of above-mentioned discharge capacity control cylinder through a solenoid valve, and
(g) cross-over connection of above-mentioned fusiformis valve is in above-mentioned supplying duct that extends between above-mentioned position control valve and above-mentioned equilibrium valve and discharge conduit, it is characterized in that above-mentioned selector valve is pilot operated formula selector valve, it can be by guide's pressure flow body remote control of being supplied with through the pilot fluid conduit by an extraneous pressure flow body supply source.
2, control device for hydraulic motor as claimed in claim 1 is characterized in that the cross-over connection of above-mentioned fusiformis valve is in above-mentioned supplying duct that extends and discharge conduit between above-mentioned braking valve unit and above-mentioned oil hydraulic motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85108834 CN1007078B (en) | 1985-12-10 | 1985-12-10 | Control device for hydraulic motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85108834 CN1007078B (en) | 1985-12-10 | 1985-12-10 | Control device for hydraulic motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85108834A CN85108834A (en) | 1987-06-24 |
| CN1007078B true CN1007078B (en) | 1990-03-07 |
Family
ID=4796159
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85108834 Expired CN1007078B (en) | 1985-12-10 | 1985-12-10 | Control device for hydraulic motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1007078B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101178083B (en) * | 2007-12-20 | 2010-06-02 | 三一重工股份有限公司 | Engineering vehicle walking driving hydraulic system |
| CN102311059B (en) * | 2010-06-30 | 2013-08-28 | 徐工集团工程机械股份有限公司建设机械分公司 | Hoisting system, and control method and control system of hydraulic motor thereof |
| DE102012020984A1 (en) * | 2012-10-25 | 2014-04-30 | Liebherr-Hydraulikbagger Gmbh | Device for driving speed control of a work vehicle and method therefor |
| CN103836014B (en) * | 2012-11-21 | 2016-12-21 | 上汽通用五菱汽车股份有限公司 | A kind of control device of propulsive mechanism |
| CN103225634B (en) * | 2013-05-10 | 2015-08-05 | 中联重科股份有限公司 | pilot control module, pilot brake control system and engineering machinery |
| CN103244496B (en) * | 2013-05-13 | 2016-02-10 | 三一汽车起重机械有限公司 | Rotary control valve group, revolution hydraulic control system and hoist |
| CN105485071B (en) * | 2015-12-07 | 2017-10-31 | 北京航空航天大学 | Hatch door transient state acting device and driving method based on valve control variable displacement motor |
| CN110296120B (en) * | 2019-06-14 | 2020-10-20 | 庆安集团有限公司 | Hatch door transient state of low power demand actuates device |
-
1985
- 1985-12-10 CN CN 85108834 patent/CN1007078B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN85108834A (en) | 1987-06-24 |
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