Hydrostatic axial piston machine having pressure side change

Patent metadata

Field	Value
Publication number	US-11603829-B2
Application number	US-202117160905-A
Country	US
Kind code	B2
Filing date	Jan 28, 2021
Priority date	Feb 13, 2020
Publication date	Mar 14, 2023
Grant date	Mar 14, 2023

Abstract

There is disclosed a hydrostatic axial piston machine having a pulse reduction device. This device has a connection location or tap in the transition region in front of the high-pressure-side kidney-like elongate hole of a distributor plate. The connection location or tap is connected by means of one or two hydraulically passively controlled switching valves to a high-pressure store. It is used for precompression and consequently for the pulse reduction. In a development, the distributor plate also has a connection location or tap in the transition region behind the high-pressure-side kidney-like elongate hole. The connection location or tap is connected via one or two hydraulically passively controlled switching valves to a low-pressure store. This is used for the decompression and consequently also for the pulse reduction.

First claim

What is claimed is:

1. A hydrostatic axial piston machine comprising:
a rotating cylinder drum;
a plurality of cylinders formed in the rotating cylinder drum, each of the plurality of cylinders connected by a respective opening to an end face of the rotating cylinder drum;
a distributor plate including
a first circular-arc-like elongate hole and a second circular-arc-like elongate hole, wherein each of the plurality openings is configured to move along a circular path, and the end face is tensioned against the distributor plate,
a first connection location provided in a first transition region between the two elongate holes and adjacent to the first elongate hole, and
a second connection location provided in a second transition region between the two elongate holes and adjacent to the second elongate hole;

a first switching valve arrangement;
a high-pressure store; and
a first and a second control pressure line operably connected to the first switching valve and configured such that
when the first circular-arc-like elongate hole is acted on with high pressure, the first connection location is connected to the high-pressure store through the first switching valve and the second connection location is blocked from the high-pressure store by the first switching valve, and
when the second circular-arc-like elongate hole is acted on with high pressure, the second connection location is connected to the high-pressure store through the first switching valve and the first connection location is blocked from the high-pressure store by the first switching valve.

2. The hydrostatic axial piston machine according to claim 1 , wherein:
the first switching valve arrangement comprises a 3/2-way switching valve having a first switching position and a second switching position;
in the first switching position the high-pressure store is connected to the first connection location and the second connection location is blocked from the high-pressure store;
in the second switching position the high-pressure store is connected to the second connection location and the first connection location is blocked from the high-pressure store;
pressure at the first elongate hole acts on a valve body of the 3/2-way switching valve in a direction toward the first switching position; and
pressure at the second elongate hole acts on the valve body of the 3/2-way switching valve in a direction toward the second switching position.

3. The hydrostatic axial piston machine according to claim 1 , wherein
the first switching valve arrangement comprises a first 2/2-way switching valve and a second 2/2-way switching valve:
a pressure of the first elongate hole acts on a valve body of the first 2/2-way switching valve in a direction of an open position and a pressure of the second elongate hole acts on the valve body of the first 2/2-way switching valve in a direction of a closure position; and
the pressure of the first elongate hole acts on a valve body of the second 2/2-way switching valve in a direction of a closure position and the pressure of the second elongate hole acts on the valve body of the second 2/2-way switching valve in a direction of an open position.

4. The hydrostatic axial piston machine according to claim 2 , further comprising:
a third connection location in the second transition region adjacent to the first elongate hole;
a fourth connection location provided in the first transition region adjacent to the second elongate hole;
a second switching valve arrangement;
a low-pressure store; and
a third and fourth control pressure line operably connected to the second switching valve and configured such that
when the first circular-arc-like elongate hole is acted on with high pressure, the third connection location is connected to the low-pressure store through the second switching valve and the fourth connection location is blocked from the low-pressure store by the second switching valve, and
when the second circular-arc-like elongate hole is acted on with high pressure, the fourth connection location is connected to the low-pressure store through the second switching valve and the third connection location is blocked from the low-pressure store by the second switching valve.

5. The hydrostatic axial piston machine according to claim 4 , wherein:
the second switching valve arrangement comprises a further 3/2-way switching valve having a third switching position and a fourth switching position;
in the third switching position the low-pressure store is connected to the third connection location and the fourth connection location is blocked from the low-pressure store;
in the fourth switching position the low-pressure store is connected to the fourth connection location and the third connection location is blocked from the low-pressure store;
pressure at the second elongate hole acts on a valve body of the further 3/2-way switching valve in a direction toward the fourth switching position; and
pressure at the first elongate hole acts on the valve body of the further 3/2-way switching valve in a direction toward the third switching position.

6. The hydrostatic axial piston machine according to claim 4 , wherein the second switching valve arrangement comprises a third 2/2-way switching valve and a fourth 2/2-way switching valve.

Assignees

• Bosch Gmbh Robert

Inventors

• Breuer David
• Nafz Timo

Classifications

• F04B11/0008

  using accumulators · CPC title

• F04B11/00

  Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation · CPC title

• F03C1/0655

  Valve means · CPC title

• F04B1/2042 Primary

  Valves · CPC title

• F04B1/324

  by changing the inclination of the swash plate · CPC title