IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
|
| 국제특허분류(IPC7판) |
|
| 출원번호 |
US-0502724
(1995-07-14)
|
| 우선권정보 |
GB-0014296 (1994-07-05) |
|
발명자
/ 주소 |
- Martin Jean-Paul M. L. (Le Fenouiller FRX) Pambrun Louis J.-B. (La Roche sur Yon FRX)
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| 출원인 / 주소 |
- New Holland North America, Inc. (New Holland PA 02)
|
| 인용정보 |
피인용 횟수 :
22 인용 특허 :
0 |
초록
▼
A utility vehicle, such as a grape harvester (1) comprising a straddling frame (2), supported at its front and rear ends by double-acting hydraulic cylinders (17, 18 and 23, 24), which can be extended or retracted in order to level the frame (2). The rear cylinders (23, 24) are normally blocked for
A utility vehicle, such as a grape harvester (1) comprising a straddling frame (2), supported at its front and rear ends by double-acting hydraulic cylinders (17, 18 and 23, 24), which can be extended or retracted in order to level the frame (2). The rear cylinders (23, 24) are normally blocked for providing the vehicle (1) with a fixed rear axle (55), while the front cylinders (16, 17) are hydraulically interconnected in order to let them extend or retract in opposition to each other for providing the vehicle (1) with an articulated axle (56). The hydraulic cylinders (17, 18, 23, 24) are governed by two control valves (38, 39) which enable lifting, lowering and sideways levelling of the frame (2). During levelling operations, the hydraulic connection between the front cylinders (16, 17) is automatically broken by a control valve (65) in order to enhance the stability of the vehicle (1). This is particularly advantageous when the vehicle (1) is levelled during downhill travel.
대표청구항
▼
A utility vehicle (1) comprising: a generally horizontal, rectangular frame (2) with opposed sides and opposed ends; two first ground-engaging members (3) at one end of said frame (2) and two second ground-engaging members (4) at the other end thereof; suspension means, supportingly mounted between
A utility vehicle (1) comprising: a generally horizontal, rectangular frame (2) with opposed sides and opposed ends; two first ground-engaging members (3) at one end of said frame (2) and two second ground-engaging members (4) at the other end thereof; suspension means, supportingly mounted between said frame (2) and said ground-engaging members (3, 4) and comprising two first hydraulic actuator means (17, 18) and two second hydraulic actuator means (23, 24) for changing the position of respectively said first ground-engaging members (3) and second ground-engaging members (4) with respect to said frame (2); hydraulic control means (26′), linked to said hydraulic actuator means (17, 18, 23, 24) and operable to produce a hydraulic flow thereto or therefrom; said control means (26′) comprising a hydraulic articulation circuitry (27), interconnecting said two first actuator means (17, 18) as to make them act in opposition relative to each other, for maintaining the two first ground-engaging members (3) in contact with the ground during instant variations in the ground contour as seen in the transverse direction of the vehicle; and position command means (49′), connected to said hydraulic control means (26′) and operable to steer said control means (26′) to change the position of said frame (2) relative to the ground; characterized in that: said hydraulic control means (26′) further comprise an articulation control means (65), which is operable to block said articulation circuitry (27), so that actuation of one of said first actuator means (17, 18) does not directly result in actuation of the other of said first actuator means (18, 17), and further characterized in that said position command means (49′) comprise levelling command means (52) for simultaneous sideways movement of the ends of the frame (2) relative to the ground; the arrangement being such that actuation of said levelling command means (52) induces the articulation control means (65) to break the articulation circuitry (27).
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