| 摘要 |
The invention relates to a hydraulic drive (1) comprising a working cylinder (2) and a travel cylinder (3) which is mechanically connected to the working cylinder (2). The working cylinder (2) and the travel cylinder (3) each comprise an upper and a lower cylinder chamber (21, 22, 31, 32), and all four cylinder chambers (21, 22, 31, 32) of the working and travel cylinder (2, 3) are connected to one another in a suitable manner in a closed pressure circuit (4) which is filled and prestressed with a hydraulic fluid (F). A rotational speed-variable hydraulic machine (5) with a first and second pressure connection (51, 52) is arranged in the pressure circuit (4) in order to conduct the hydraulic fluid (F) between the individual cylinder chambers (21, 22, 31, 32) of the working and travel cylinder (2, 3) during the operation (B) of the hydraulic drive (1). At least one first and second distributing valve (6, 7) are arranged in the pressure circuit (4) such that the respective valve switch positions (61, 62, 71, 72, 73) which are suitable for the different operating phases of the hydraulic drive (1) together with the suitably driven hydraulic machine (5) allow a common movement of the work and travel cylinder (2, 3) in one or the other piston movement direction (R1, R2). For this purpose, preferably only the first and the second distributing valve (6, 7) are arranged in the pressure circuit (4). The hydraulic drive (1) requires a minimum number of components, maintains a low installation complexity, improves the energy efficiency, can be constructed in a compact manner, and can be operated in a sufficiently variable manner. |
| 主权项 |
1. A hydraulic drive comprising:
a working cylinder and a driving cylinder mechanically connected with the working cylinder, wherein the working cylinder and the driving cylinder each comprise one upper and one lower cylinder chamber and all four cylinder chambers of the working cylinder and the driving cylinder are connected with each other in an appropriate way in a closed pressure circuit filled with a hydraulic fluid and preloaded, wherein a hydraulic machine with a first and a second pressure connection in the pressure circuit for transferring the hydraulic fluid between the individual cylinder chambers of the working cylinder and the driving cylinder during operation of the hydraulic drive is arranged, and wherein at least one first and one second way valve is arranged within the pressure circuit in such a way that each of their switch positions that are appropriate for the different operational phases of the hydraulic drive, along with the appropriately operated hydraulic machine, enable a combined movement of the working cylinder and the driving cylinder in one or the other piston movement direction (R1, R2), preferably, to this end, only the first and the second way valve are arranged in the pressure circuit, the first way valve is arranged in a first pressure line of the pressure circuit, which connects the two cylinder chambers of the working cylinder with each other and in a first switch position enables a two-way passage of the hydraulic fluid for short-circuiting the two cylinder chambers, and whereby the first way valve is a 2/2-way valve, designed to block the first pressure line in the other second switch position in both directions, and wherein the hydraulic drive provides a power mode up and a power mode down. |
