IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0203176
(2000-12-20)
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우선권정보 |
JP-0026378 (2000-02-03); JP-0026377 (2000-02-03) |
국제출원번호 |
PCT//JP00/09063
(2002-10-22)
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§371/§102 date |
20021022
(20021022)
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국제공개번호 |
WO01//56864
(2001-08-09)
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발명자
/ 주소 |
- Kitasaka, Yuji
- Hasebe, Takeshi
- Katou, Katsunori
- Miwa, Toshiyuki
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출원인 / 주소 |
|
대리인 / 주소 |
Knobbe, Martens, Olson &
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인용정보 |
피인용 횟수 :
14 인용 특허 :
8 |
초록
▼
A hydraulically driven traveling vehicle comprising a pair of right and left driving axles (driving sprockets) differentially connected to each other by a differential mechanism, the input section of the differential mechanism having the output rotation of traveling HST 110 (110) transmitted thereto
A hydraulically driven traveling vehicle comprising a pair of right and left driving axles (driving sprockets) differentially connected to each other by a differential mechanism, the input section of the differential mechanism having the output rotation of traveling HST 110 (110) transmitted thereto, both driving sprockets having mutually opposite two-flow output rotations separately transmitted thereto from a steering HST (120), thereby effecting traveling driving and turning, electromagnetic solenoids (61a, 61b, 62a, 62b) serving as output regulating devices for the traveling HST and the steering HST being provided so that the manipulated variables and directions of a speed change lever and a steering operation tool are converted into electric signals, on the basis of which electric signals the output current values of the electromagnetic solenoids are controlled, causing the respective output rotary speeds of the HSTs to correspond to the output current values.
대표청구항
▼
1. A hydraulically driven traveling vehicle, comprising:a pair of left and right drive axles; a differential mechanism differentially connecting said pair of drive axles to each other; a traveling hydrostatic stepless transmission; a steering hydrostatic stepless transmission, wherein mutually oppos
1. A hydraulically driven traveling vehicle, comprising:a pair of left and right drive axles; a differential mechanism differentially connecting said pair of drive axles to each other; a traveling hydrostatic stepless transmission; a steering hydrostatic stepless transmission, wherein mutually opposite two-flow output rotations of said steering hydrostatic stepless transmission are separately transmitted to said respective drive axles while output rotation of said traveling hydrostatic stepless transmission is transmitted to an input section of said differential mechanism, thereby making said vehicle travel and turn; a speed change operation tool manipulated by a driver so as to set each speed of said vehicle traveling forward and backward, wherein manipulated variable and direction of said speed change operation tool is converted into an electric signal; a steering operation tool manipulated by a driver so as to set each turning radius of said vehicle turning left and right, wherein manipulated variable and direction of said steering operation tool is converted into an electric signal; a pair of electromagnetic solenoids serving as respective output regulating means of said traveling hydrostatic stepless transmission and said steering hydrostatic stepless transmission, wherein an output current value of each of said electromagnetic solenoids is controlled based on both the electric signals resulting from manipulation of said speed change operation tool and said steering operation tool so as to create an output rotary speed of each of said hydrostatic stepless transmissions corresponding to said controlled output current value, a brake for braking both said left and right drive axles disposed in a transmission system to both said drive axles; and a brake operation tool for acting said brake, wherein the output current values of said pair of electromagnetic solenoids are electrically controlled so as to vanish the output current values of said traveling hydrostatic stepless transmission and said steering hydrostatic stepless transmission, without changing positions of the speed change operation tool and the steering operation tool, when said brake operation tool is operated at a stroke so as to reach a prefixed neutral setting position, wherein both of the output of the traveling hydrostatic stepless transmission and the output of the steering hydrostatic stepless transmission are controlled by both of the speed change operation tool and the steering operation tool, whereby the output of the traveling hydrostatic stepless transmission and the output of the steering hydrostatic stepless transmission are correlated with each other. 2. The hydraulically driven traveling vehicle as set forth in claim 1, further comprising: a pair of crawler traveling devices disposed left and right sides of said vehicle respectively, wherein said pair of crawler traveling devices have respective driving sprocket shafts serving as said left and right drive axles.3. The hydraulically driven traveling vehicle as set forth in claim 1, further comprising: a steering wheel serving as said steering operation tool.4. The hydraulically driven traveling vehicle as set forth in claim 1, further comprising: a pair of hydraulic servomechanisms serving as respective output regulating means of said traveling hydrostatic stepless transmission and said steering hydrostatic stepless transmission; anda pair of electromagnetic proportional valves serving as respective hydraulic controlling means for said respective hydraulic servomechanisms, wherein said pair of electromagnetic solenoids are provided in said respective electromagnetic proportional valves. 5. The hydraulically driven traveling vehicle as set forth in claim 1, wherein the output current value of said electromagnetic solenoid of said traveling hydrostatic stepless transmission is controlled on the basis of both the electric signals resulting from manipulation of said traveling operation tool and said steering operation tool so that, while said steering operation tool is manipulated from a straight traveling setting position toward a limit position for either left or right turning of said vehicle within a certain range, the output speed of said traveling hydrostatic stepless transmission is almost fixed, and while said steering operation tool is manipulated, beyond said certain range to said limit position, the output speed of said traveling hydrostatic stepless transmission is reduced so that the reduction degree thereof increases as said steering operation tool approaches said limit position.6. The hydraulically driven traveling vehicle as set forth in claim 5, wherein the output current value of said electromagnetic solenoid of said traveling hydrostatic stepless transmission is so controlled that a ratio of output speed of said traveling hydrostatic stepless transmission when said steering operation tool being set in an arbitrary position to the output speed of said traveling hydrostatic stepless transmission when said steering operation tool being set in said straight traveling setting position is fixed wherever said speed change operation tool is set.7. The hydraulically driven traveling vehicle as set forth in claim 6, wherein the output current value of said electromagnetic solenoid of said steering hydrostatic stepless transmission is controlled on the basis of both the electric signals resulting from manipulation of said speed change operation tool and said steering operation tool so that a ratio of output speed of said steering hydrostatic stepless transmission when said steering operation tool being set in an arbitrary position to the output speed of said traveling hydrostatic stepless transmission when said steering operation tool being set in said arbitrary position is fixed wherever said speed change operation tool is set.8. The hydraulically driven traveling vehicle as set forth in claim 7, wherein the output current value of said electromagnetic solenoid of said steering hydrostatic stepless transmission is controlled on the basis of both the electric signals resulting from manipulation of said speed change operation tool and said steering operation tool so that, while said speed change operation tool is set for creating a speed lower than a certain value, a ratio of output speed of said steering hydrostatic stepless transmission when said steering operation tool being set in an arbitrary position to the output speed of said traveling hydrostatic stepless transmission when said steering operation tool being in said arbitrary position is larger than said fixed ratio.9. The hydraulically driven traveling vehicle as set forth in claim 7, wherein the output current value of said electromagnetic solenoid of said steering hydrostatic stepless transmission is controlled on the basis of both the electric signals resulting from manipulation of said speed change operation tool and said steering operation tool so that, while said steering operation tool is manipulated from said straight traveling setting position to a limit position for either right or left turning of said vehicle, a setting position of said steering operation tool for vanishing the rotary speed of said drive axle on inside of said vehicle in turning, which has been reduced from a speed during the straight traveling of said vehicle, is fixed.10. The hydraulically driven traveling vehicle as set forth in claim 1, wherein an upper limit is provided to a displacement speed of the output current value of said electromagnetic solenoid for said traveling hydrostatic stepless transmission so that, when said displacement speed corresponding to manipulation speed of said speed change operation tool becomes larger than said upper limit, said output current value of said electromagnetic solenoid for said traveling hydrostatic stepless transmission varies at said upper limit of said displacement speed.11. The hydraulically driven traveling vehicle as set forth in claim 1, further comprising: a foot pedal serving as said brake operation tool.12. The hydraulically driven traveling vehicle as set forth in claim 1, further comprising: a switch which changes when said brake operation tool is operated at the stroke so as to reach said neutral setting position, wherein the output current values of said electromagnetic solenoids are controlled by detecting an electric signal as the change of said switch so as to vanish the output speeds of said traveling hydrostatic stepless transmission and said steering hydrostatic stepless transmission.13. The hydraulically driven traveling vehicle as set forth in claim 1, wherein the displacement speeds of output current values of said electromagnetic solenoids for resetting the output speeds of said traveling hydrostatic stepless transmission and said steering hydrostatic stepless transmission when the stroke of said brake operation tool beyond said neutral setting position is reduced across said neutral setting position are held no more than respective certain values.14. The hydraulically driven traveling vehicle as set forth in claim 1, wherein said neutral setting position of said brake operation tool is disposed at a position corresponding to a stroke of said brake operation tool which is smaller than a stroke thereof corresponding to a braking position for acting said brake.15. The hydraulically driven traveling vehicle as set forth in claim 14, wherein the displacement speeds of output current values of said electromagnetic solenoids for vanishing the output speeds of said traveling hydrostatic stepless transmission and said steering hydrostatic stepless transmission when said brake operation tool reaches said neutral setting position are held under respective certain values.16. The hydraulically driven traveling vehicle as set forth in claim 1, wherein an engine is allowed to start when said brake operation tool is operated at a stroke so as to reach a braking position and it is confirmed that said speed change operation tool is set at its neutral position.17. A hydraulically driven traveling vehicle comprising: left and right drive axles;a differential mechanism differentially connecting the drive axles to each other; a traveling HST (hydrostatic stepless transmission) including a traveling HST pump with a swash plate and a traveling HST motor, wherein the traveling HST pump is adapted to be coupled to an engine and controls the traveling HST motor by regulating output of the traveling HST pump using the swash plate; a steering HST including a steering HST pump with a swash plate and a steering HST motor, wherein the steering HST pump is adapted to be coupled to the engine and controls the steering HST motor by regulating output of the steering HST pump using the swash plate, wherein mutually opposite two-flow output rotations of said steering HST are separately transmitted to said respective drive axles while output rotation of said traveling HST is transmitted to an input section of said differential mechanism, thereby making said vehicle travel and turn; a speed change operation tool manipulated by a driver so as to set each speed of said vehicle traveling forward and backward, wherein manipulated variable and direction of said speed change operation tool is converted into an electric signal; a steering operation tool manipulated by a driver so as to set each turning radius of said vehicle turning left and right, wherein manipulated variable and direction of said steering operation tool is converted into an electric signal; a pair of electromagnetic solenoids configured to control the respective swash plates under predetermined rules for regulate respective outputs of said traveling HST and said steering HST, wherein an output current value of each of said electromagnetic solenoids is controlled based on both the electric signals resulting from manipulation of said speed change operation tool and said steering operation tool so as to create an output rotary speed of each of said HSTs corresponding to said controlled output current value; a brake for braking both said left and right drive axles disposed in a transmission system to both said drive axles; and a brake operation tool for acting said brake, wherein the output current values of said pair of electromagnetic solenoids are electrically controlled so as to vanish the output current values of said traveling HST and said steering HST, without changing positions of the speed change operation tool and the steering operation tool, when said brake operation tool is operated at a stroke so as to reach a prefixed neutral setting position. 18. The hydraulically driven traveling vehicle as set forth in claim 17, further comprising: a pair of hydraulic servomechanisms for manipulating said respective swash plates; anda pair of electromagnetic proportional valves for controlling said respective hydraulic servomechanisms, wherein said pair of electromagnetic solenoids are coupled to said respective electromagnetic proportional valves. 19. A hydraulically driven traveling vehicle with left and right drive axles, comprising:a traveling HST, output of which is regulated by an electromagnetic solenoid; a steering HST, output of which is regulated by an electromagnetic solenoid; a speed change operation tool manipulated by a driver, which regulates both of the electromagnetic solenoids for the traveling HST and for the steering HST; a steering operation tool manipulated by the driver, which regulates both of the electromagnetic solenoids for the traveling HST and for the steering HST; a brake for braking both said left and right drive axles disposed in a transmission system to both said drive axles; and a brake operation tool for acting said brake, wherein output current values of said electromagnetic solenoids are electrically controlled so as to vanish output current values of said traveling HST and said steering HST, without changing positions of the speed change operation tool and the steering operation tool, when said brake operation tool is operated at a stroke so as to reach a prefixed neutral setting position, wherein both of the output of the traveling HST and the output of the steering HST are controlled by both of the speed change operation tool and the steering operation tool, whereby the output of the traveling HST and the output of the steering HST are correlated with each other.
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