IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0615412
(2009-11-10)
|
등록번호 |
US-8443596
(2013-05-21)
|
우선권정보 |
DE-10 2009 021 866 (2009-05-19) |
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
3 |
초록
▼
The invention relates to a hydraulic drive (2) having a main pump (8), which can be adjusted in terms of delivery volume and delivery direction, and having a hydraulic motor (9), which main pump (8) and hydraulic motor (9) are connected to one another in a closed circuit via pressure lines (10A, 10B
The invention relates to a hydraulic drive (2) having a main pump (8), which can be adjusted in terms of delivery volume and delivery direction, and having a hydraulic motor (9), which main pump (8) and hydraulic motor (9) are connected to one another in a closed circuit via pressure lines (10A, 10B), and having a charge pump (14, 15) for charging into the closed circuit and for supplying pressurized fluid to at least one controlling device (11, 12), wherein the charge pump (15) has a separate drive motor (19) whose power/rotational speed can be specified independently of the rotational speed of the drive (3) of the main pump (8). In this way, the charge pump (15) can be of smaller dimensions than previously conventional, and the power balance of the hydraulic drive can be improved.
대표청구항
▼
1. Hydraulic drive (2) having a main pump (8), which can be adjusted in terms of delivery volume and delivery direction, and having a hydraulic motor (9), which main pump (8) and hydraulic motor (9) are connected to one another in a closed circuit via pressure lines (10A, 10B), and having a charge p
1. Hydraulic drive (2) having a main pump (8), which can be adjusted in terms of delivery volume and delivery direction, and having a hydraulic motor (9), which main pump (8) and hydraulic motor (9) are connected to one another in a closed circuit via pressure lines (10A, 10B), and having a charge pump (14, 15) for charging into the closed circuit and for supplying pressurized fluid to at least one controlling device (11, 12), characterized in that the charge pump (15) has a separate drive motor (19) whose power/rotational speed can be specified independently of the rotational speed of a drive (3) of the main pump (8); a temperature sensor for the temperature of the pressurized fluid is provided, which temperature sensor is connected via a signal line to the electronics (4) for controlling the rotational speed of the drive motor (19) of the charge pump (15). 2. Hydraulic drive according to claim 1, characterized in that the drive motor (19) is an electric motor. 3. Hydraulic drive according to claim 2, characterized in that the electric motor can be controlled/regulated in terms of rotational speed and is connected to electronics (4) for control. 4. Hydraulic drive according to claim 3, characterized in that a pressure sensor (21) for the charge pressure is arranged at the outlet of the charge pump (15), which pressure sensor (21) is connected to the electronics (4). 5. Hydraulic drive according to claim 4, characterized in that the pressure sensor (21) is arranged upstream of a purge valve (23). 6. Hydraulic drive according to claim 1, characterized in that the hydraulic motor (9) is a variable displacement motor with a controlling device (12) connected to electronics (4). 7. Hydraulic drive according to claim 6, characterized in that the electronics (4) for controlling the drive motor (19) of the charge pump (15) also control a traction drive (1) by means of the controlling device (12). 8. Hydraulic drive according to claim 1, characterized in that the charge pump (15) is an external gear pump, internal gear pump, gerotor pump, roller vane pump, vane-type pump or axial piston pump. 9. Hydraulic drive according to claim 1, characterized in that the charge pump (15) is adjustable in terms of delivery volume. 10. The hydraulic drive according to claim 1 wherein when the temperature of the pressurized fluid exceeds a predetermined value the drive motor (19) of the charge pump (15) is activated. 11. The hydraulic drive according to claim 1 wherein when the temperature of the pressurized fluid exceeds a predetermined value the drive motor (19) of the charge pump (15) is activated causing oil exchange in the hydraulic drive (2) which cools the pressurized fluid.
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