公开(公告)号：EP0679227A1

公开(公告)日：1995-11-02

申请号：EP94904992.0

申请日：1994-01-06

Applicant: Danfoss A/S

Inventor： JEPSEN, Hardy, Peter

IPC: F04B1

CPC classification number: F04B1/2021 ,  F04B1/2042 ,  F05C2225/04 ,  F05C2253/12

Abstract: A hydraulic piston machine is disclosed, with a cylinder body (1) and a control counter-plate (4) which engage one another via the intermediary of a control surface, the cylinder body having at least one cylinder which emerges by way of an opening (2) into the control surface, and the control counter-plate (4) has a high-pressure channel (6) and a low-pressure channel (5) which are connected to a high-pressure connection and a low-pressure connection (7) respectively and, upon movement of cylinder body (1) and control counter-plate (4) relative to one another, are passed over by the opening (2), the low-pressure channel (5) having a groove (9) at its end passed over first by the opening (2). It is desirable to be able to operate a machine of that kind also with a hydraulic fluid that has a relatively low viscosity. For that purpose, the groove (9), together with the opening (2), produces a directed jet (12) at least immediately after the start of their overlap.

公开(公告)号：EP0774073B1

公开(公告)日：2000-03-15

申请号：EP94904996.9

申请日：1994-01-12

Applicant: Danfoss A/S

Inventor： JEPSEN, Hardy, Peter

IPC: F04B1/20

CPC classification number: F04B1/126 ,  Y10T74/18336

Abstract: A hydraulic axial piston machine is disclosed, having an inclined plate (7), on which a slider shoe (9) of at least one piston slides on relative movement between a cylinder body (2) receiving the piston and the inclined plate (7), and a pressure plate (10) articulated on the cylinder body (2) and holding the slider shoe (9) in engagement with the inclined plate. It is desirable for such a machine also to be operable with a hydraulic fluid that has no lubricating properties. For that purpose, between the pressure plate (10) and the cylinder body (2) there is arranged a bearing element (18) with a bearing surface (19) of plastics material, which slides with low friction on a counterpart (15) made of metal lying against the bearing surface (19).

公开(公告)号：EP0679226B1

公开(公告)日：1997-09-10

申请号：EP94904991.0

申请日：1994-01-05

Applicant: Danfoss A/S

Inventor： MARTENSEN, Lars ,  JEPSEN, Hardy, Peter

IPC: F04B1/20

CPC classification number: F04B1/2021 ,  Y10T74/18336

Abstract: A hydraulic axial piston machine is disclosed, with a cylinder drum (2), which has at least one cylinder (3), in which a piston (6) is mounted so as to be axially displaceable, and with a control counter-plate (11) which, on rotation of the cylinder drum (2) and the control counter-plate (11) relative to one another, connects the cylinder (3) in dependence upon its position with a fluid inlet (14) and a fluid outlet (15). With a machine of that kind, it is desirable to improve balancing out of the forces necessary for effecting a seal between the cylinder drum (3) and the control counter-plate (11). For that purpose, between the cylinder drum (2) and the control counter-plate (11) there is arranged a pressure plate (17) which engages the cylinder drum (2) via the intermediary of a spring element (21), the pressure plate (17) having a through-opening (20) associated with the cylinder (3), which through-opening is connected to the cylinder (3) in a fluid-tight manner.

公开(公告)号：EP0770181A1

公开(公告)日：1997-05-02

申请号：EP95924869.0

申请日：1995-06-30

Applicant: Danfoss A/S

Inventor： MARTENSEN, Lars ,  HANSEN, Ove, Thorbol ,  MOLLER, Henry, Madsen ,  JEPSEN, Hardy, Peter

IPC: F04B1

CPC classification number: F04B1/124 ,  F05C2203/0882 ,  F05C2253/12

Abstract: A hydraulic pumping device for use in a hydraulic machine having a piston and slider shoe unit made of a combination of plastic and metal material to operate with virtually lubricant free fluid.

公开(公告)号：EP0733167A1

公开(公告)日：1996-09-25

申请号：EP95903258.0

申请日：1994-12-01

Applicant: Danfoss A/S

Inventor： JEPSEN, Hardy, Peter

IPC: F03C1

CPC classification number: F03C1/0647

Abstract: A hydraulic axial piston motor (1) is disclosed, having a cylinder drum (4) which is connected, so that it is non-movable axially, to a shaft (3) and so that they rotate together, and which has at least one cylinder (5), for each cylinder a piston (6) arranged in the cylinder, which piston bears at its end projecting from the cylinder drum (4) against a swash plate (8) via the intermediary of a slider shoe (7), a pressure-applying arrangement (9) for holding at least one slider shoe (7) against the swash plate and a control plate (12) with control kidneys. It is desirable for such a motor to be reliably operable even when the shaft is provided with axial play. Leakages in particular are to be avoided. For that purpose, the pressure-applying device (9) is mounted so as to be axially movable relative to the cylinder drum (4). A pressure plate (13) that is axially movable relative to the cylinder drum (4) is arranged between the control plate (12) and the cylinder drum (4), this pressure plate having for each cylinder a through-opening (14) which is connected in a fluid-tight manner to the cylinder (5). Furthermore, between the pressure-applying device (9) and the presssure plate (13) there is provided an expanding device (18) which acts on the pressure-applying device (9) and the pressure plate (13) with oppositely directed forces.

公开(公告)号：EP0733164A1

公开(公告)日：1996-09-25

申请号：EP95903260.0

申请日：1994-12-05

Applicant: Danfoss A/S

Inventor： JEPSEN, Hardy, Peter ,  KLYNDER, Flemming

IPC: F03C1 ,  F04B1

CPC classification number: F03C1/0671 ,  F04B1/2085 ,  F05C2225/08 ,  F05C2225/12 ,  Y10T74/18336

Abstract: A hydraulic piston engine (1) driven by a lubricant-free, water-based pressure fluid, and comprising an enclosing housing (2) and a piston-connected drive shaft (6) supported by radial journal bearings in bearing bushings (9). One of the sliding surfaces (8) of the radial journal bearing comprises a recess (11) with a bearing-supporting hydrostatic pressure fluid pocket. The centre of the recess (11) is displaced by an angle (α) in the direction against the direction of rotation of the drive shaft (6), seen in relation to the geometrical, radial mean point in the high-load area for transmission of the piston forces to the bearing surface (8) via the drive shaft (6). Hereby a particularly reliable piston motor of the type indicated is provided.

公开(公告)号：EP0679226A1

公开(公告)日：1995-11-02

申请号：EP94904991.0

申请日：1994-01-05

Applicant: Danfoss A/S

Inventor： MARTENSEN, Lars ,  JEPSEN, Hardy, Peter

IPC: F03C1 ,  F04B1

CPC classification number: F04B1/2021 ,  Y10T74/18336

Abstract: A hydraulic axial piston machine is disclosed, with a cylinder drum (2), which has at least one cylinder (3), in which a piston (6) is mounted so as to be axially displaceable, and with a control counter-plate (11) which, on rotation of the cylinder drum (2) and the control counter-plate (11) relative to one another, connects the cylinder (3) in dependence upon its position with a fluid inlet (14) and a fluid outlet (15). With a machine of that kind, it is desirable to improve balancing out of the forces necessary for effecting a seal between the cylinder drum (3) and the control counter-plate (11). For that purpose, between the cylinder drum (2) and the control counter-plate (11) there is arranged a pressure plate (17) which engages the cylinder drum (2) via the intermediary of a spring element (21), the pressure plate (17) having a through-opening (20) associated with the cylinder (3), which through-opening is connected to the cylinder (3) in a fluid-tight manner.

公开(公告)号：EP0770180B1

公开(公告)日：2001-08-08

申请号：EP95924868.3

申请日：1995-06-28

Applicant: Danfoss A/S

Inventor： JEPSEN, Hardy, Peter ,  KRISTENSEN, Egon ,  MARTENSEN, Lars

IPC: F04B1/20

CPC classification number: F04B1/126 ,  F04B1/124 ,  F05C2225/04 ,  F05C2253/12

Abstract: A piston/slide shoe arrangement (1) of a hydraulic piston machine is disclosed, having a slide shoe (6), which is in articulated connection with a piston (4), with a friction-reducing plastics material (11) therebetween, wherein the plastics material, forming a channel (13), extends into a through-opening (12) in the slide shoe in a direction towards a sliding contact surface (7) of the slide shoe, which surface in operation lies against a swash plate (8). In such an arrangement, it is desirable when operating under adverse conditions to prevent the plastics material working its way out from the space between the piston and the slide shoe. For that purpose, the slide shoe (6) and the plastics material (11) are provided outside the through-opening (12) with at least one connecting element (16, 18) which takes up shear forces between slide shoe (6) and plastics material (11).

公开(公告)号：EP0733164B1

公开(公告)日：2001-01-17

申请号：EP95903260.8

申请日：1994-12-05

Applicant: Danfoss A/S

Inventor： JEPSEN, Hardy, Peter ,  KLYNDER, Flemming

IPC: F03C1/04 ,  F03C1/06

CPC classification number: F03C1/0671 ,  F04B1/2085 ,  F05C2225/08 ,  F05C2225/12 ,  Y10T74/18336

公开(公告)号：EP0770179B1

公开(公告)日：1999-09-01

申请号：EP95924193.6

申请日：1995-06-27

Applicant: Danfoss A/S

Inventor： JEPSEN, Hardy, Peter ,  MOLLER, Henry, Madsen

IPC: F04B1/20

CPC classification number: F04B1/2035 ,  F05C2253/12 ,  Y10T74/18336 ,  Y10T403/32696

Abstract: A piston with a slide shoe is described for a hydraulic piston engine, where the piston is designed with a ball socket, and where the slide shoe is provided with a corresponding ball head, whereby these are connected in a ball-and-socket joint, and where the ball head of the slide shoe is designed as a unit moulded into the ball socket in friction reducing material of uneven material thickness. Hereby an improved fixation of the moulded-on ball head on the slide shoe is achieved.