公开(公告)号：US20190316572A1

公开(公告)日：2019-10-17

申请号：US16377518

申请日：2019-04-08

申请人： Robert Bosch GmbH

发明人： Timo Nafz

IPC分类号： F04B1/12 ,  F04B1/20

摘要： A hydrostatic axial piston machine includes a housing, a connection plate closing the housing, working connections formed on the connection plate, a drive shaft, a swashplate, a cylinder drum coupled to the shaft in the direction of rotation, bores formed in the drum and each including a piston, a control plate against which the drum bears, a retraction plate for removing a piston from the bores, and a retraction ball arranged in front of the first end face of the drum which surrounds a drum neck of the drum and the shaft and by which the retraction plate is loaded in the direction of the swashplate. A pressure chamber is defined by seals between the retraction ball, the drum, and the shaft, and is configured to be acted upon by a pressure above a housing pressure. The retraction ball is sealed against the drum neck and against the shaft.

公开(公告)号：US11008862B2

公开(公告)日：2021-05-18

申请号：US16210777

申请日：2018-12-05

申请人： Robert Bosch GmbH

发明人： David Breuer ,  Timo Nafz ,  Stefan Merz

IPC分类号： F01B3/00 ,  F04B1/2021 ,  F03C1/06 ,  F03C1/34 ,  F04B1/2042

摘要： A hydrostatic piston engine comprises a housing with a cylinder drum with cylinder bores mounted rotatably therein. Each of the cylinder bores receives a working piston in a longitudinally displaceable manner, via which a hydrostatic working chamber is delimited by the cylinder bore. The hydrostatic working chamber has an opening on an outer surface of the cylinder drum by which, when the cylinder drum rotates, outlets of a high-pressure chamber and of a low-pressure chamber of the piston engine and a reversing surface arranged between the two outlets in the rotational direction can be passed over in alternating fashion. At least one pressurizing medium channel is provided which, on one hand, opens out in the reversing surface and, on the other, into a pressurizing medium trough of the piston engine.

公开(公告)号：US10107272B2

公开(公告)日：2018-10-23

申请号：US15154093

申请日：2016-05-13

申请人： Robert Bosch GmbH

发明人： Matthias Schnell ,  Stefan Hoppe ,  Timo Nafz

IPC分类号： F04B1/12 ,  F04B1/20 ,  F04B1/14 ,  F03C1/28 ,  F03C1/06

摘要： A sliding shoe for supporting a piston of a hydrostatic axial piston machine against a swash plate includes a sliding face that defines a central concentric pressure pocket that is flat in order to stabilize the sliding shoe. The pressure pocket has radial supply grooves in order to ensure an optimal supply of pressure medium to the pressure pocket from a central mouth opening. The radial supply grooves extend through the pressure pocket and as far as a circumferential groove which surrounds the pressure pocket.

公开(公告)号：US11592012B2

公开(公告)日：2023-02-28

申请号：US16998121

申请日：2020-08-20

申请人： Robert Bosch GmbH

发明人： David Breuer ,  Peter Roos ,  Rudolf Appel ,  Timo Nafz

IPC分类号： F04B1/24 ,  F04B1/2014 ,  F01B3/00 ,  F04B1/128 ,  F04B11/00 ,  F03C1/06

摘要： A hydrostatic piston machine unit, which is in particular designed as a hydrostatic axial piston machine unit, comprises at least two driving mechanisms that can be driven synchronously and have displacement pistons which each perform a reciprocating motion in operation and are provided for delivery into a common pressure line. The hydrostatic piston machine unit has a jointly assigned precompression volume for the at least two driving mechanisms.

公开(公告)号：US11261861B2

公开(公告)日：2022-03-01

申请号：US16585133

申请日：2019-09-27

申请人： Robert Bosch GmbH

发明人： Timo Nafz

IPC分类号： F04B49/12 ,  F04B1/295 ,  F04B1/22

摘要： A hydrostatic piston machine has an adjustment element that is adjustable for varying a displacement volume, and a rotating cylinder part having a plurality of cylinder bores with pistons that are supported on the adjustment element and delimit a displacement chamber. Each displacement chamber is moved in an alternating manner by a connecting opening to overlap a low-pressure control opening situated on a low-pressure side of a stationary control part and a high-pressure control opening situated on a high-pressure side of the control part. Two switching regions are situated between the low-pressure control opening and the high-pressure control opening, the pistons changing direction at a dead center within the switching regions. The position of the adjustment element is determined from a pressure profile which is a function of the variable size of the displacement chambers in a switching region, the variable size depending on the position of the adjustment element.

公开(公告)号：US10760554B2

公开(公告)日：2020-09-01

申请号：US16375025

申请日：2019-04-04

申请人： Robert Bosch GmbH

发明人： Stefan Hoppe ,  Timo Nafz

IPC分类号： F04B1/2035 ,  F04B53/16 ,  F04B1/124 ,  F04B1/2078

摘要： A hydrostatic axial piston machine includes a cylinder drum having a substantially hollow cylindrical base body, and liners. The body includes cylinder bores located around a central axis. The liners have an outer diameter press-fitted into the bores such that an outer end face of each liner is positioned in a region of an opening of a respective bore, and such that an inner end face of each liner is positioned deep within the respective bore. An outer half of each liner, starting from the outer end face, includes an axially delimited circumferential recess in an outer casing surface of the liner. The machine is configured to operate with great forces acting between the liners and displacement pistons. The recess in each liner is shaped such that, in an axial section through the liner enclosing an axis of the liner, a depth of the recess increases more than once and decreases more than once.

公开(公告)号：US20190323489A1

公开(公告)日：2019-10-24

申请号：US16381635

申请日：2019-04-11

申请人： Robert Bosch GmbH

发明人： David Breuer ,  Timo Nafz

IPC分类号： F04B1/30 ,  F03C1/40 ,  F03C1/06 ,  F04B1/20

摘要： A swashplate-type axial piston machine includes a housing, a first pivot bearing received in the housing, a drive shaft rotatably mounted in respect of an axis of rotation, a cylinder drum, a control plate, a third control aperture in the plate, and a first channel arranged in the housing. The first pivot bearing delimits a first and second housing space from one another. The drum and the plate are arranged in the first housing space. The plate has at least a first and at least a second control aperture. The first aperture is in fluidic exchange connection with a first fluid connection on the housing. The second aperture is in fluidic exchange connection with a second fluid connection on the housing. The third aperture is arranged in the peripheral direction between a first and a second aperture. The first channel fluidically connects the third aperture to the second housing space.

公开(公告)号：US09879533B2

公开(公告)日：2018-01-30

申请号：US14200105

申请日：2014-03-07

申请人： Robert Bosch GmbH

发明人： Christian Spielvogel ,  Manuel Sell ,  Martin Zug ,  Timo Nafz

IPC分类号： F01B3/00 ,  F16F1/18 ,  F16F1/32

CPC分类号： F01B3/0082 ,  F01B3/0073 ,  F16F1/185 ,  F16F1/324

摘要： A spring return apparatus for elastically prestressing sliding pads against a sliding bearing face of an axial piston machine. The sliding pads are positioned on working pistons mounted axially movably in cylinders of a cylinder barrel that drives a drive shaft including a spring plate and a supporting plate. The spring plate includes a ring region surrounding a central opening, and levers extending radially from the ring region. The levers are arranged spaced apart or distributed uniformly in the circumferential direction, and are elastically flexible and/or elastically pivotable in the axial direction. Every two adjacent levers delimit a receiving region for receiving a tapered section of a working piston or a sliding pad. The supporting plate has a circular ring-shaped supporting region configured to support radially outer end sections of the levers if the supporting plate is arranged concentrically with respect to and axially adjacently to the spring plate.

公开(公告)号：US11746762B2

公开(公告)日：2023-09-05

申请号：US17647483

申请日：2022-01-10

申请人： Robert Bosch GmbH

发明人： Timo Nafz ,  Christoph Walz ,  Daniel Gieringer ,  David Breuer ,  Joachim Binder ,  Kai Bauckhage ,  Matthias Blankenberg-Teich ,  Stefan Haug ,  Stephan Breckheimer

IPC分类号： F04B1/2064 ,  F04B1/2078 ,  F04B1/2071 ,  F03C1/06

CPC分类号： F04B1/2064 ,  F03C1/0665 ,  F04B1/2071 ,  F04B1/2078

摘要： A swashplate-type axial piston machine includes a housing and at least one working channel extending through a distributor plate. The at least one working channel opens out at an outside on the housing at an associated working port. The at least one working channel includes a first section and a second section. The first section extends over the entire distributor plate. The second section is arranged entirely in the housing. The second section directly adjoins the first section. A first rotary bearing has an outer circumferential surface that defines a circular cylindrical reference cylinder about the axis of rotation.

公开(公告)号：US20230127532A1

公开(公告)日：2023-04-27

申请号：US17965441

申请日：2022-10-13

申请人： Robert Bosch GmbH

发明人： David Breuer ,  Sebastian Birk ,  Stefan Haug ,  Stefan Hoppe ,  Timo Nafz

IPC分类号： F04B1/2078

摘要： A control plate for an axial piston machine is disclosed. The control plate includes a control face on which at least one kidney-shaped high-pressure control opening extending axially through the control plate and at least one kidney-shaped low-pressure control opening extending axially through the control plate is formed and which defines a first sealing ridge which is formed radially inside the at least one high-pressure control opening and the at least one low-pressure control opening, and a second sealing ridge which is formed radially outside the at least one high-pressure control opening and the at least one low-pressure control opening. In this case, the second sealing ridge is wider in the radial direction, preferably in some portions, than the first sealing ridge. Additionally, an axial piston machine in a swash plate design is disclosed. The axial piston machine includes a control plate which has at least one kidney-shaped high-pressure control opening and at least one kidney-shaped low-pressure control opening, by way of which piston recesses of a cylinder drum which is rotatably mounted in a housing of the axial piston machine can be connected alternately to a high-pressure connection and a low-pressure connection during rotation of the cylinder drum. In this case, a first, radially inner sealing ridge and a second, radially outer sealing ridge, which is designed to be wider in the radial direction, preferably in some portions, than the first sealing ridge, are formed on a contact face between the control plate and the cylinder drum.