KR101756558B1 - A hydraulic steering device of a track vehicle - Google Patents

A hydraulic steering device of a track vehicle Download PDF

Info

Publication number
KR101756558B1
KR101756558B1 KR1020150185606A KR20150185606A KR101756558B1 KR 101756558 B1 KR101756558 B1 KR 101756558B1 KR 1020150185606 A KR1020150185606 A KR 1020150185606A KR 20150185606 A KR20150185606 A KR 20150185606A KR 101756558 B1 KR101756558 B1 KR 101756558B1
Authority
KR
South Korea
Prior art keywords
hydraulic line
steering
pilot
hydraulic
line
Prior art date
Application number
KR1020150185606A
Other languages
Korean (ko)
Other versions
KR20170076830A (en
Inventor
구본성
Original Assignee
현대다이모스(주)
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 현대다이모스(주) filed Critical 현대다이모스(주)
Priority to KR1020150185606A priority Critical patent/KR101756558B1/en
Publication of KR20170076830A publication Critical patent/KR20170076830A/en
Application granted granted Critical
Publication of KR101756558B1 publication Critical patent/KR101756558B1/en

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
    • B62D5/08—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by type of steering valve used
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D11/00—Steering non-deflectable wheels; Steering endless tracks or the like
    • B62D11/02—Steering non-deflectable wheels; Steering endless tracks or the like by differentially driving ground-engaging elements on opposite vehicle sides
    • B62D11/06—Steering non-deflectable wheels; Steering endless tracks or the like by differentially driving ground-engaging elements on opposite vehicle sides by means of a single main power source
    • B62D11/08—Steering non-deflectable wheels; Steering endless tracks or the like by differentially driving ground-engaging elements on opposite vehicle sides by means of a single main power source using brakes or clutches as main steering-effecting means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D3/00—Steering gears
    • B62D3/14—Steering gears hydraulic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
    • B62D5/09—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by means for actuating valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
    • B62D5/30—Safety devices, e.g. alternate emergency power supply or transmission means to ensure steering upon failure of the primary steering means

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Steering Mechanism (AREA)

Abstract

The present invention relates to a hydraulic steering apparatus for a track vehicle that operates a steering clutch of a track vehicle steering transmission by hydraulic pressure and includes a main hydraulic line for supplying operating hydraulic pressure to an actuator of a steering clutch from a hydraulic pressure supply source, A sub hydraulic line provided in parallel to the main hydraulic line, a hydraulic selector valve for selectively supplying an operating hydraulic pressure of the main hydraulic line or the sub hydraulic line to the actuator of the steering clutch, A first pilot opening / closing valve for opening / closing a pilot pressure applied to the pilot hydraulic line, a second pilot opening / closing valve for opening / closing a pilot hydraulic line, and a second pilot opening / , The control pressure is calculated in proportion to the steering angle of the tracked vehicle, And a control unit for applying a pressure signal corresponding to the steering angle to the proportional control valve, so that the steering system can be easily switched manually even when the valve for switching between the stepless steering system and the mechanical steering system fails.

Description

Technical Field [0001] The present invention relates to a hydraulic steering apparatus for a track vehicle,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic steering apparatus for a track vehicle, and more particularly, to a hydraulic steering apparatus for a track vehicle that operates a steering clutch of a track vehicle steering transmission by hydraulic pressure.

Generally, the track vehicle is steered by the left and right speed difference at the transmission output shaft, and the left and right speed difference is different according to the gear ratio in the steering apparatus.

As shown in Fig. 1, a conventional hydraulic steering apparatus is a hydraulic steering apparatus of a track vehicle that operates a steering clutch of a track vehicle steering transmission by hydraulic pressure, and operates from an oil pressure supply source to actuators P1, P2 and P3 of a steering clutch A proportional control for variably supplying the operating hydraulic pressure according to a signal applied to the actuators P1, P2, and P3 of the steering clutch, provided on the main hydraulic line 110, 132 and 133 are connected to the sub hydraulic lines 131, 132 and 133 provided in parallel with the main hydraulic line 110 and the actuators P1, P2 and P3 of the steering clutch, A pilot hydraulic pressure line 150 for applying a pilot pressure to the oil passage selection valve, and a pilot hydraulic pressure line 150 for supplying a pilot pressure from the main hydraulic pressure line 110 to the wave It is configured to include a pilot hydraulic line for opening and closing a pilot opening and closing the pilot pressure applied to the 150 valve 160.

In the conventional hydraulic steering apparatus, an endless steering system using the main hydraulic lines 111, 112, and 113 and a mechanical steering system using the sub hydraulic lines 131, 132, and 133 can be selectively operated. The main oil pressure lines 111, 112 and 113 and the sub hydraulic lines 131, 132 and 133 are selectively opened and closed by the oil line selection valves 141, 142 and 143, so that any one of the hydraulic pressures of the main hydraulic lines 111, 112 and 113 and sub hydraulic lines 131, P2, and P3 of the first motor M1. The pilot selection valves 141, 142 and 143 for selecting the main hydraulic lines 111, 112 and 113 and the sub hydraulic lines 131, 132 and 133 operate by the pilot pressure supplied to the pilot hydraulic line 150. The pilot on- 110 to the pilot hydraulic line 150.

In the case of the stepless steering mode, the operating oil pressure supplied through the main hydraulic line 110 is varied through the proportional control valves 121, 122 and 123, so that the direction is continuously changed. On the other hand, in the case of the mechanical steering system, since the proportional control valves 121, 122 and 123 are not used, the gear ratios of the respective steering ends are fixed, and the steering direction change occurs when the steering end is changed.

The mechanical steering system is on-off control, which is advantageous in terms of steering responsiveness. However, when the steering speed is changed, a steering impact is generated due to a difference in speed according to the gear ratio, and the orbit vehicle is rapidly turned to deteriorate stable operation. It will hinder the ride. Therefore, the mechanical steering system is supplementarily used when the operation of the stepless steering system is impossible.

However, the pilot opening / closing valve 160, which determines the switching of the operation mode, includes a solenoid operated by an electrical signal to open and close the flow path. When the solenoid fails or current is not supplied due to an electrical problem, 150 can not be properly opened or closed.

On the other hand, when the driver intends to change the steering mode at will according to the driving conditions, the command signal for operating the pilot opening / closing valve 160 must be inputted to the control unit. In the case of the stepless steering method, the proportional control valves 121, 122, There is a problem in that the driver can not change the steering mode in the case of the system which is automatically switched to the mechanical steering mode only at the time of the operation.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the hydraulic steering apparatus of the conventional tracked vehicle as described above, and it is an object of the present invention to provide a hydraulic steering apparatus capable of easily switching a steering system manually even when a valve for switching between an endless steering system and a mechanical steering system fails The present invention provides a hydraulic steering apparatus for a tracked vehicle capable of arbitrarily changing a steering mode by an operator's intention in an automatic switching mode.

In order to achieve the above object, a hydraulic steering apparatus of a track vehicle according to the present invention is a hydraulic steering apparatus of a track vehicle for operating a steering clutch of a track vehicle steering transmission by hydraulic pressure, A proportional control valve provided in the main hydraulic line for variably supplying a hydraulic pressure to the actuator of the steering clutch in response to a signal applied from the control unit, a main hydraulic line provided in parallel with the main hydraulic line, A sub hydraulic line for supplying an operating hydraulic pressure to an actuator of the steering clutch; a flow rate selector valve for selectively supplying an operating hydraulic pressure of the main hydraulic line or sub hydraulic line to an actuator of the steering clutch; And a pilot pressure is applied to the flow path selection valve A first pilot opening / closing valve for opening / closing a pilot pressure applied from the main hydraulic line to the pilot hydraulic line, a second pilot opening / closing valve for selectively opening / closing the pilot hydraulic line, And a controller for calculating a control pressure proportional to the steering angle of the vehicle and applying a pressure signal corresponding to the steering angle to the proportional control valve during operation.

In the hydraulic steering apparatus for a railway vehicle according to an embodiment of the present invention, a bypass line bypassing the first pilot opening / closing valve is branched to the pilot hydraulic line, and the second pilot opening / May be provided in parallel with the first pilot opening / closing valve.

In the hydraulic steering apparatus for a tracked vehicle according to an embodiment of the present invention, the first pilot opening / closing valve is operated by an electrical signal from the control unit, and the second pilot opening / closing valve is manually operated It is also possible to do.

In the hydraulic steering apparatus for a tracked vehicle according to an embodiment of the present invention, the control unit detects a malfunction due to failure of the first pilot opening / closing valve and outputs the detected malfunction to the driver, and the second pilot opening / It is also possible for the valve to be operated by the driver in the event of a failure.

In the hydraulic steering apparatus for a railway vehicle according to an embodiment of the present invention, the steering clutch may include a steering one-stage clutch having a different reduction ratio, a steering two-stage clutch, and a steering three-stage clutch.

The main hydraulic line includes a first main hydraulic line, a second main hydraulic line, and a third main hydraulic line for supplying operating hydraulic pressures to respective actuators of the steering first-stage clutch, steering second-stage clutch and steering third- can do.

The sub hydraulic line includes a first sub hydraulic line, a second sub hydraulic line, and a third sub hydraulic line for supplying operating hydraulic pressure to each actuator of the steering first-stage clutch, the steering second-stage clutch and the steering third- .

Wherein the flow path selection valve includes a first flow path selection valve for selecting the first main hydraulic line or the first sub hydraulic line, a second flow path selection valve for selecting the second main hydraulic line or the second sub hydraulic line, 3 main hydraulic line or a third sub hydraulic line.

The pilot hydraulic line is connected to a first pilot hydraulic line, a second pilot hydraulic line and a third pilot hydraulic line for applying a pilot pressure to the first, second and third flow selection valves, respectively. .

As described above, according to the hydraulic steering apparatus for a railway vehicle according to the present invention, it is possible to easily switch the steering system manually even in the event of a failure of a valve for switching between an endless steering system and a mechanical steering system, So that the steering system can be changed arbitrarily.

1 is a hydraulic circuit diagram showing a hydraulic steering apparatus of a tracked vehicle according to a conventional technique,
2 is a hydraulic circuit diagram showing a hydraulic steering apparatus for a tracked vehicle according to an embodiment of the present invention,
3 is a conceptual view showing a hydraulic steering apparatus of the track vehicle shown in FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 to 3, a hydraulic steering apparatus for a tracked vehicle according to an embodiment of the present invention includes a main hydraulic line 10 for supplying operating hydraulic pressure from an oil pressure supply source to actuators P1, P2, and P3 of a steering clutch A proportional control valve (21, 22, 23) for variably supplying an operating hydraulic pressure to the actuators (P1, P2, P3) of the steering clutch, a sub hydraulic line provided in parallel with the main hydraulic line (10) A hydraulic pressure line 50 for selectively supplying the operating hydraulic pressure of the main hydraulic line 10 or the sub hydraulic line to the actuators P1, P2, and P3 of the steering clutch, A first pilot opening / closing valve 60 for opening / closing a pilot pressure applied to the pilot hydraulic line 50 from the main hydraulic line 10, a bypass line 60 branched for the pilot hydraulic line 50, 70, and the bypass line 70 And a control unit for calculating a control pressure proportional to the steering angle of the track vehicle and applying a pressure signal corresponding to the steering angle during operation to the proportional control valves 21,

The main hydraulic line 10 is composed of a first main hydraulic line 11, a second main hydraulic line 12 and a third main hydraulic line 13.

The main hydraulic line 10 is provided with a main opening / closing valve 80 for opening / closing a working hydraulic pressure applied to the actuators P1, P2, P3 of the steering clutches from a hydraulic pressure supply source.

The first main hydraulic pressure line 11 supplies the hydraulic pressure to the steering one-stage clutch actuator P1 and the second main hydraulic pressure line 12 supplies the hydraulic pressure to the steering two-stage clutch actuator P2, 3 main hydraulic line 13 supplies the hydraulic pressure to the steering three-stage clutch actuator P3.

The first main hydraulic fluid line 11 and the second main hydraulic fluid line 12 and the third main hydraulic fluid line 13 are connected to the steering first-stage clutch actuator P1 via three proportional control valves 21, The steering two-stage clutch actuator P2, and the steering three-stage clutch actuator P3, respectively.

The proportional control valves 21, 22 and 23 are provided in the main hydraulic line 10 and variably supply operating hydraulic pressure to the actuators P1, P2 and P3 of the steering clutch according to signals applied from the control unit.

The proportional control valves 21, 22 and 23 are connected via a first main hydraulic pressure line 11, a second main hydraulic pressure line 12 and a third main hydraulic pressure line 13 in accordance with an applied current amount, The hydraulic pressure supplied to the actuator P1, the steering two-stage clutch actuator P2, and the steering three-stage clutch actuator P3 are proportionally opened and closed to enable infinite steering at a fine angle.

The control unit (not shown) applies a control signal to the proportional control valves 21, 22 and 23 to open and close the hydraulic pressure controlled by the control algorithm, and the proportional control valves 21, And the hydraulic pressure is proportionally opened and closed to be supplied to the steering one-stage clutch actuator P1, the steering two-stage clutch actuator P2, and the steering three-stage clutch actuator P3, respectively.

Further, when the pressure controlled by the proportional control valves 21, 22, and 23 is supplied to the clutch, it is possible to attenuate the steering shift shock due to the sudden increase in pressure, thereby improving durability.

The sub hydraulic line supplies operating hydraulic pressure to the main hydraulic line (10) and selectively actuators (P1, P2, P3) of the steering clutch. That is, the operating hydraulic pressure is supplied to the actuators P1, P2, P3 of the steering clutch through the main hydraulic line 10 or to the actuators P1, P2, P3 of the steering clutch via the sub hydraulic line.

The sub hydraulic line includes a first sub hydraulic line 31 for supplying operating hydraulic pressure to the steering first-stage clutch actuator P1, a steering second-stage clutch actuator P2, and a steering three-stage clutch actuator P3, A sub hydraulic line 32, and a third sub hydraulic line 33. As shown in Fig.

The flow path selector valve includes a first flow path selector valve 41 for selecting the first main hydraulic fluid line 11 and the first sub hydraulic fluid line 31, And a third flow path selector valve 43 for selecting the third main hydraulic fluid line 13 and the third sub hydraulic fluid line 33 .

The hydraulic pressure is always supplied to the first sub hydraulic line 31, the second sub hydraulic line 32 and the third sub hydraulic line 33 to maintain the standby state, and the first and second sub hydraulic lines 41, When the two-flow selector valve 42 and the third flow selector valve 43 open the first sub hydraulic line 31, the second sub hydraulic line 32 and the third sub hydraulic line 33, And the hydraulic pressure is supplied to the clutch actuator P1, the steering second-stage clutch actuator P2, and the steering third-stage clutch actuator P3.

The pilot hydraulic line (50) is branched from the main hydraulic line (10) and is connected to the first hydraulic pressure line for applying a pilot pressure to the first, second and third flow rate selection valves Line 51, a second pilot hydraulic line 52, and a third pilot hydraulic line 53. [

The first pilot opening / closing valve 60 is provided on the pilot hydraulic line 50 and is connected to the first pilot hydraulic line 51, the second pilot hydraulic line 52, and the third pilot hydraulic line 50 from the main hydraulic line 10, And opens and closes the pilot pressure applied to the line 53.

During normal operation, the flow path selection valve opens the main hydraulic line (10) side to allow proportional control by proportional control valves (21, 22, 23). At this time, the first pilot opening / closing valve 70 closes the pilot hydraulic line 61, 62, 63 and opens the first flow path selection valve 41, the second flow path selection valve 42, 43 apply hydraulic pressure to the first main hydraulic line 11, the second main hydraulic line 12, and the third main hydraulic line 13, respectively.

In the failure mode of the proportional control valves 21, 22 and 23, the control unit controls the hydraulic pressure of the first sub hydraulic line 31, the second sub hydraulic line 32 and the third sub hydraulic line 33, The first pilot opening / closing valve 70 is opened so as to be supplied to the steering one-stage clutch actuator P1, the steering two-stage clutch actuator P2, and the steering three-stage clutch actuator P3.

At this time, the hydraulic pressure of the main hydraulic line 10 flows into the pilot hydraulic lines 61, 62 and 63, and the first and second flow path selection valves 41 and 42, The first sub hydraulic line 31, the second sub hydraulic line 32 and the third sub hydraulic line 33 are opened. The hydraulic pressure in the first sub hydraulic line 31, the second sub hydraulic line 32 and the third sub hydraulic line 33 is supplied to the clutch as in the conventional hydraulic system.

The bypass line 70 is provided in parallel with the pilot hydraulic line 50 so that the pilot pressure can bypass the first pilot opening / closing valve 60. The bypass line 70 is provided with a second pilot opening / closing valve 75.

The pilot hydraulic line 50 and the bypass line 70 are provided in parallel and the second pilot opening / closing valve 75 is provided on the bypass line 70, so that the first pilot opening / closing valve 60 and the second pilot opening / 2 pilot opening / closing valve 75 are also provided in parallel.

Therefore, when the pilot hydraulic line 50 is closed due to the failure of the first pilot opening / closing valve 60, the second pilot opening / closing valve 75 opens the bypass line 70 so that the pilot pressure is shifted to the sub hydraulic line .

The first pilot opening / closing valve (60) is provided with a solenoid operated by an electrical signal from a control unit. Therefore, if the solenoid fails or current is not supplied due to an electric problem, the pilot hydraulic line 50 can not be properly opened and closed. If an abnormality occurs in the first pilot opening / closing valve 60, the control unit outputs an abnormal signal so that the driver can recognize the abnormality.

The second pilot opening / closing valve 75 manually opens and closes the bypass line 70 by a mechanical operation of the driver. When the driver wishes to change the steering mode, when the first pilot opening / closing valve 60 fails, the second pilot opening / closing valve 75 is manually operated to open the bypass line 70 so as to return the pilot pressure to the sub hydraulic line It is possible to apply it.

On the other hand, even when the driver desires to change from the steering mode using the sub hydraulic line to the stepless steering mode, the second pilot opening / closing valve 75 is arbitrarily operated by the driver to close the bypass line 70, .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is obvious that the modification or the modification is possible by the person.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10: Main hydraulic line
11: 1st main hydraulic line
12: 2nd main hydraulic line
13: Third main hydraulic line
21, 22, 23: Proportional control valve
31: first sub hydraulic line
32: second sub hydraulic line
33: Third sub hydraulic line
41: First flow-through selector valve
42: second flow-through selector valve
43: third flow-through selector valve
50: Pilot hydraulic line
51: first pilot hydraulic line
52: second pilot hydraulic line
53: Third pilot hydraulic line
60: first pilot opening / closing valve
70: Bypass flow
75: second pilot opening / closing valve
80: main opening / closing valve

Claims (5)

A hydraulic steering apparatus of a track vehicle for operating a steering clutch of a track vehicle steering transmission by hydraulic pressure,
A main hydraulic line for supplying operating hydraulic pressure from the hydraulic pressure source to the actuator of the steering clutch;
A proportional control valve provided on the main hydraulic line for variably supplying operating hydraulic pressure to an actuator of the steering clutch;
A sub hydraulic line provided in parallel with the main hydraulic line and supplying operating hydraulic pressure to an actuator of the steering clutch;
A flow path selector valve for selectively supplying an operating oil pressure of the main hydraulic line or the sub hydraulic line to the actuator of the steering clutch;
A pilot hydraulic line branching from the main hydraulic line and applying a pilot pressure to the channel selection valve;
A first pilot opening / closing valve for opening / closing a pilot pressure applied from the main hydraulic line to the pilot hydraulic line;
A second pilot opening / closing valve for selectively opening and closing said first pilot opening / closing valve and said pilot hydraulic line;
And a controller for calculating a control pressure in proportion to the steering angle of the track vehicle and applying a pressure signal corresponding to the steering angle to the proportional control valve during operation,
A bypass line bypassing the first pilot opening / closing valve is branched on the pilot hydraulic line, the second pilot opening / closing valve is provided in parallel with the first pilot opening / closing valve on the bypass line,
Wherein the first pilot opening / closing valve is operated by an electrical signal from the control unit,
The second pilot opening / closing valve is manually operated by a mechanical operation of the driver,
The control unit detects a malfunction due to the failure of the first pilot opening / closing valve and outputs the detected malfunction to the driver,
Wherein the second pilot opening / closing valve is operated by a driver when the first pilot opening / closing valve fails. delete delete delete The method according to claim 1,
Wherein the steering clutch includes a steering one-stage clutch having different gear ratio, a steering two-stage clutch and a steering three-stage clutch,
The main hydraulic line includes a first main hydraulic line, a second main hydraulic line, and a third main hydraulic line for supplying operating hydraulic pressures to respective actuators of the steering first-stage clutch, steering second-stage clutch and steering third- In addition,
The sub hydraulic line includes a first sub hydraulic line, a second sub hydraulic line, and a third sub hydraulic line for supplying operating hydraulic pressure to the respective actuators of the steering first-stage clutch, the steering second-stage clutch and the steering third- ,
Wherein the flow path selection valve includes a first flow path selection valve for selecting the first main hydraulic line or the first sub hydraulic line, a second flow path selection valve for selecting the second main hydraulic line or the second sub hydraulic line, 3 " main hydraulic line or a " third sub hydraulic line "
The pilot hydraulic line is connected to a first pilot hydraulic line, a second pilot hydraulic line and a third pilot hydraulic line for applying a pilot pressure to the first, second and third flow selection valves, respectively. And wherein the hydraulic control unit is operable to control the hydraulic steering unit of the track vehicle.
KR1020150185606A 2015-12-24 2015-12-24 A hydraulic steering device of a track vehicle KR101756558B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150185606A KR101756558B1 (en) 2015-12-24 2015-12-24 A hydraulic steering device of a track vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150185606A KR101756558B1 (en) 2015-12-24 2015-12-24 A hydraulic steering device of a track vehicle

Publications (2)

Publication Number Publication Date
KR20170076830A KR20170076830A (en) 2017-07-05
KR101756558B1 true KR101756558B1 (en) 2017-07-11

Family

ID=59352357

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150185606A KR101756558B1 (en) 2015-12-24 2015-12-24 A hydraulic steering device of a track vehicle

Country Status (1)

Country Link
KR (1) KR101756558B1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101524380B1 (en) * 2013-12-27 2015-05-29 현대다이모스(주) A hydraulic steering device of a track vehicle
JP2015174559A (en) * 2014-03-14 2015-10-05 トヨタ自動車株式会社 Drive device for hybrid vehicle

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101524380B1 (en) * 2013-12-27 2015-05-29 현대다이모스(주) A hydraulic steering device of a track vehicle
JP2015174559A (en) * 2014-03-14 2015-10-05 トヨタ自動車株式会社 Drive device for hybrid vehicle

Also Published As

Publication number Publication date
KR20170076830A (en) 2017-07-05

Similar Documents

Publication Publication Date Title
JP5147208B2 (en) Hydraulic control device for automatic double clutch transmission
JP5148853B2 (en) Hydraulic control device for automatic double clutch transmission
US7513109B2 (en) Hydraulic controller for working machine
US8544263B2 (en) Construction equipment having electric control lever
EP1790859B1 (en) Hydraulic controller for working machine
KR20090008713A (en) Hydraulic control system of automatic transmission for vehicle
CN107110345B (en) For the valve gear of vehicle, automatic transmission and method for controlling valve gear
US7591214B2 (en) Driving motor controlling device of construction machine
US20150299987A1 (en) Construction machine
US20180319429A1 (en) Hydraulic steering unit
BG112870A (en) Hydraulic control system
KR101491253B1 (en) Transmission- hydraulic-circuit possible forward/reverse driving on limp-home-mode state
KR102177250B1 (en) Automatic steering system for agricultural machinery
WO2020031816A1 (en) Construction-machinery hydraulic circuit
KR101756558B1 (en) A hydraulic steering device of a track vehicle
KR102448755B1 (en) Control system for construction machinery and control method for construction machinery using the same
JP2012082969A (en) Hydraulic switching device for setting advancing/backing and automatic change gear
KR101524380B1 (en) A hydraulic steering device of a track vehicle
KR101776728B1 (en) Hydraulic control system of automatic transmission for vehicles
JP7189746B2 (en) vehicle
WO2019188061A1 (en) Hydraulic circuit for work vehicle
KR101205206B1 (en) Hydraulic control apparatus for auto transmission
JP4926627B2 (en) Electric oil system
JPH11303808A (en) Hydraulic system of hydraulic drive type working vehicle
KR100611717B1 (en) Hydraulic circuit of heavy equipment

Legal Events

Date Code Title Description
E701 Decision to grant or registration of patent right
GRNT Written decision to grant