Abstract: A supercharging device for compressing charge air for an internal combustion engine having a scroll compressor is proposed, a displacement scroll (5) being connected to the supercharger shaft by way of an eccentric arrangement between a front bearing and rear bearing of the supercharger shaft (6), an externally driven drive element, such as a belt pulley or the like, being provided outside a housing (1) of the supercharging device, and the supercharger shaft (6) being connectable to the externally driven drive element by means of a controllable clutch member. The intended distinguishing features of the supercharging device according to the invention are a simpler bearing support and in particular a front bearing of smaller dimensions. This is achieved in that all connections of the drive and/or guide elements for the displacement scroll are arranged between the front bearing (2) and the rear bearing (3).

Abstract: A hydraulic circuit for actuation of a hydraulic working cylinder (1) having a one-sided piston rod (1a), comprising a reversible pump (4) whereby both sides of said pump are connected via a supply line (5) and a first two-way valve (6) to the tank (7) containing hydraulic medium and through releasable control check valves (8) to the working cylinder (1). Both sides of the arrangement are further connected respectively to a hydraulic closeable valve (21, 31) through a discharge line (20, 30) and also to the tank (7) through a replenishing suction line (22, 32) having a corresponding suction valve (9). Each of said hydraulic closeable valves (21, 31) is controlled by the pump (4) through a second two-way valve (4).

Abstract: A hydraulic circuit for actuation of a hydraulic working cylinder (1) having a one-sided piston rod (1a), comprising a reversible pump (4) whereby both sides of said pump are connected via a supply line (5) and a first two-way valve (6) to the tank (7) containing hydraulic medium and through releasable control check valves (8) to the working cylinder (1). Both sides of the arrangement are further connected respectively to a hydraulic closeable valve (21, 31) through a discharge line (20, 30) and also to the tank (7) through a replenishing suction line (22, 32) having a corresponding suction valve (9). Each of said hydraulic closeable valves (21, 31) is controlled by the pump (4) through a second two-way valve (4).