oil pump

Abstract

The invention relates to an oil pump (2) for a machine (1), in particular a fluid machine (1), preferably a compressor (1) or a piston compressor (1), for household, transport or industry, with a piston pump (20, 30) whose cylinder chamber (33) serves for the intake and discharge of oil in an oil circuit (4) of the machine (1), wherein the cylinder chamber (33) is in fluid communication with a reservoir chamber (43) of an oil reservoir (40) of the oil pump (2), wherein an oil pressure (p) can be imposed on the reservoir chamber (43) by means of the cylinder chamber (33) and the oil can be drawn in and discharged by means of the reservoir chamber (43).

Description

[0001] The invention relates to an oil pump for a machine and to a machine, in particular a fluid machine. State of the art

[0002] A compressor is a fluid machine used to compress a fluid such as air, a refrigerant, or another gas (mixture). The compressor receives energy from a power source such as an electric motor or a turbine. Compressors, especially reciprocating compressors, are commonly used in homes, transportation, and industry, for example, in air conditioning systems, refrigeration units (such as air conditioners or refrigerators), heat pumps, compressed air systems, etc.

[0003] For example, in a piston compressor, its piston is mounted within a compressor cylinder, driven by, for example, an electric linear motor, and moved back and forth within a hermetically sealed housing. This movement draws in, compresses, and expels a fluid. An oil film in the gap between the compressor piston and the compressor cylinder is necessary for lubrication, sealing, and / or cooling. Oil pumps, such as reciprocating or rotary pumps, are used for this purpose.

[0004] This means that an oil pump is provided to pump the oil, which is stored primarily in an oil sump within the piston compressor housing, into a gap between the compressor cylinder and the compressor piston, in order to ensure the lubrication, sealing, and / or cooling of the piston compressor. The performance of the oil pump results from the combination of its delivery rate and the pressure differential across the oil pump. For efficiency reasons, the power consumption of the oil pump should be low. Task

[0005] In a known reciprocating piston oil pump, oil delivery occurs due to flow through the pump along the axis of movement of its piston, requiring a through-hole in the piston. The stroke and frequency of the oil pump are predetermined by its connection to, for example, a compressor. The delivery volume of the oil pump can only be preset by adjusting the diameter ratio of the pump piston to its through-hole. Due to the through-hole in the piston, reducing the piston diameter, and thus the delivery volume, is significantly limited. The object of the invention is to provide an improved oil pump for a machine, such as a compressor. Disclosure of the invention

[0006] The object of the invention is achieved by means of an oil pump for a machine, in particular a fluid machine, preferably a compressor or a piston compressor, for household, transport or industrial use, and by means of a machine, in particular a fluid machine, preferably a compressor or a piston compressor, for household, transport or industrial use. Advantageous further developments, additional features and / or advantages of the invention will become apparent from the dependent claims and the following description.

[0007] The oil pump according to the invention comprises a piston pump whose cylinder chamber serves to draw in and expel oil in an oil circuit of the machine, wherein the cylinder chamber is in fluid communication with a reservoir chamber of an oil reservoir of the oil pump, and an oil pressure can be imposed on the reservoir chamber by means of the cylinder chamber and the oil can be drawn in and / or expelled by means of the reservoir chamber.

[0008] The oil circuit can serve various purposes, such as lubrication, sealing, and / or cooling of the machine. In this configuration, the cylinder chamber serves for indirect intake, and potentially direct compression and / or exhaust of oil into the oil circuit, whereas the reservoir chamber serves for direct intake, potentially indirect compression, and / or direct exhaust of oil into the oil circuit. The oil flow through the pump no longer occurs along the axis of movement of its pump piston, but at an angle to it, for example, a 90° angle. A bore in the pump piston is no longer necessary. The diameter of the pump piston can therefore be further reduced, and the delivery volume of the oil pump can be decreased.

[0009] The cylinder chamber can be configured as a first pumping chamber in the piston pump, with a volume-changing piston and cylinder. The reservoir chamber, located away from or at a distance from the piston pump, can be configured as a second pumping chamber in the oil pump, with a substantially constant volume. The pump piston can be a movable piston and the pump cylinder a stationary cylinder in the oil pump. Alternatively, the pump piston can be a stationary piston and the pump cylinder a movable cylinder in the oil pump.

[0010] In this context, "movable" means that the pump piston or pump cylinder can move within the machine, whereas "fixed" means that the pump cylinder or pump piston is relatively immobile or at rest within the machine. In the latter case, the pump cylinder or pump piston can be directly or indirectly fixed to a housing and / or another potentially load-bearing structure of the machine.

[0011] The pump piston or cylinder can be mechanically coupled to a movable section of the machine, which can be designed, for example, as a reciprocating, oscillating, vibrating, or damping section. Accordingly, the pump cylinder or piston can be rigidly connected to a stationary section of the machine. Furthermore, the oil reservoir can be rigidly connected to a stationary section of the machine.

[0012] In the oil circuit, the reservoir chamber can have an inlet valve upstream, in particular designed as an inlet check valve. Furthermore, in the oil circuit, the reservoir chamber can have an outlet valve downstream, in particular designed as an outlet check valve. The inlet valve and / or the outlet valve can, of course, also be designed as an electrically actuated or electrically controlled valve. The inlet check valve and the outlet check valve can be mechanically biased against the direction of oil flow through the reservoir chamber.

[0013] The cylinder chamber and the reservoir chamber can be in essentially direct fluid communication, either unthrottled or throttled. The cylinder chamber can open essentially directly into the reservoir chamber, or an oil line can be installed between the cylinder chamber and the reservoir chamber. In the first case, the cylinder chamber shares a common wall, e.g., at the front, and the reservoir chamber shares a common wall, e.g., laterally. The cylinder chamber or the oil line can open into the reservoir chamber between the inlet valve and the outlet valve of the reservoir chamber.

[0014] The cylinder chamber and the reservoir chamber can be arranged separately from each other in the oil pump such that a delivery direction of the cylinder chamber and a delivery direction of the reservoir chamber preferably have an angle other than 0° and 180° (naturally integer multiples thereof). The delivery direction of the cylinder chamber and a delivery direction of the reservoir chamber can each include an angle of approximately: 5°, 15°, 30°, 45°, 60°, 75°, 90° ±10°. However, an angle of 0° or 180° is also applicable, with the reservoir chamber being arranged, for example, parallel to the cylinder chamber. Furthermore, the ratio of the oil reservoir volume to the delivery volume of the piston pump can be approximately: 10; 9; 8; 7; 6; 5; 4; 3; 2; 1; 0.9; 0.8; 0.7; 0.6; 0.5; 0.4; 0.3; 0.2; 0.1 each ±10-25%.

[0015] A return spring, particularly a helical spring, can be installed in the cylinder chamber of the piston pump. This return spring can be mechanically supported at one longitudinal end against the pump piston and at its other longitudinal end against the cylinder base of the pump cylinder. When oil is pumped by the piston pump, oil can be forced into and out of the return spring. Furthermore, the return spring can be mechanically supported radially against the cylinder base of the pump cylinder, outside of an oil delivery port in the cylinder base.

[0016] The reservoir chamber can be straight, curved, or angled. Furthermore, the reservoir chamber can be a section, possibly widened, within an oil line of the machine. In such a case, it is easy to install the inlet and outlet valves. Of course, the oil reservoir can also be designed differently, such as a small tank or similar structure. Preferably, the pump piston does not have a through-hole for oil delivery by the oil pump.

[0017] The machine according to the invention has an oil sump or other oil reservoir from which oil can be pumped into an oil circuit of the machine by means of an oil pump, the oil pump being designed according to the invention. A control unit for controlling and / or regulating the operation of the machine may be included. The oil reservoir of the oil pump can be integrated into the oil circuit of the machine, while the piston pump of the oil pump is connected to the oil circuit of the machine. The oil reservoir is integrated into the oil circuit such that the inlet valve of the oil reservoir is located upstream and the outlet valve of the oil reservoir is located downstream.

[0018] In operation, the oil reservoir of the oil pump is essentially open to oil flow in only one direction. Depending on the volume of the oil reservoir and the frequency of the piston pump, the oil flow through the reservoir is intermittent, essentially in the same direction (go-and-stop). In operation, oil can flow into the pump cylinder of the oil pump in one direction and out in the opposite direction. Depending on the stroke of the piston pump, a volume of oil flows in and then out again in each cycle of the piston pump (in-and-out), with a different volume of oil flowing in and out in the following cycle.

[0019] The pump piston or cylinder can be mechanically coupled to a movable section of the machine. This section can be designed as a reciprocating, oscillating, vibrating, or damping section, etc. The pump cylinder or piston can also be rigidly connected to a stationary section of the machine. Furthermore, the oil reservoir can be rigidly connected to a stationary section of the machine.

[0020] An upstream section of the reservoir can be connected to the oil sump or another oil reservoir in the machine's oil circuit via the inlet valve. Furthermore, a downstream section of the reservoir can be connected to a section of the machine via the outlet valve. This section can be a part of the machine requiring lubrication, sealing, and / or cooling. The piston pump cylinder can be fluid-mechanically connected to the oil circuit between the inlet and outlet valves.

[0021] In some embodiments, the piston pump or the oil pump can be designed as a bearing and / or a damper within the machine. Furthermore, the oil pump can be located at least partially or substantially entirely within the oil sump or other oil reservoir. In addition, the machine can be used to operate an open or closed fluid circuit. Brief description of the character

[0022] The invention is explained in more detail below with reference to exemplary embodiments and the accompanying schematic drawing, which is not to scale. In the invention, a feature can be positive (i.e., present) or negative (i.e., absent). In this specification, a negative feature is not explicitly defined as a feature unless the invention specifically emphasizes its absence. That is, the actual invention, rather than one constructed by the prior art, consists of omitting this feature. The absence of a feature (negative feature) in an exemplary embodiment indicates that the feature may be optional (to a person skilled in the art). The purely exemplary and highly schematic figure (Fig.) of the drawing shows an oil pump of a machine, in particular a fluid machine, with a piston pump whose cylinder chamber is in fluid communication with an externally designed reservoir chamber of an oil reservoir of the oil pump. Embodiments of the invention

[0023] The invention – an oil pump 2 for a machine 1 – is explained in more detail below with reference to exemplary embodiments of an embodiment shown in the figure. The oil pump 2, or the machine 1 with the oil pump 2, can be used, for example, in an air conditioner, a refrigeration unit (e.g., an air conditioning unit or a refrigerator), a heat pump, a compressed air device, etc., for household, transportation, and / or industrial use; alternatively, the machine 1 can be configured as such. In principle, the invention is applicable wherever a machine 1 requires lubrication, sealing, and / or cooling, etc., by means of or through an oil.

[0024] The drawing shows only those sections of oil pump 2 and machine 1 that are necessary for understanding the invention. Although the invention is described and illustrated in detail by preferred embodiments, the invention is not limited by the disclosed embodiments. Other variations can be derived from them without departing from the scope of protection of the invention.

[0025] The figure shows a highly abstract embodiment of the oil pump 2 in a state installed in the machine 1, wherein the oil pump 2 can pump oil from an oil sump 100 of the machine 1 into a section of the machine 1 within an oil circuit 4 of the machine 1, in which there is a need for lubrication, sealing and / or cooling, etc., within the machine 1. An alternative to the oil sump 100 is another oil storage medium, e.g., in the form of an oil tank, a pan, etc., within the machine 1.

[0026] The oil pump 2 is positioned between an internally movable section 120 of machine 1 and an internally stationary section 140 of machine 1. The movable section 120 can be configured as a reciprocating, oscillating, vibrating, or damping section of machine 1. The stationary section 140 can, for example, be a section of a housing of machine 1 or a section rigidly connected to a housing of machine 1. Furthermore, the stationary section 140 can also be configured as an external stationary section (140). In this case, the oil pump 2 is positioned between the external section (140) and the machine 1 itself.

[0027] The oil pump 2 comprises a piston pump 20, 30 and a separate oil reservoir 40, wherein the oil reservoir 40 is not substantially identical to a pump cylinder 30 of the piston pump 20, 30. The oil reservoir 40 can be in fluid communication with the piston pump 20, 30 substantially directly or indirectly, with the pump cylinder 30 opening substantially directly into the oil reservoir 40 or vice versa (not shown), or an oil line 53 can be provided between the oil reservoir 40 and the pump cylinder 30.

[0028] Depending on the distance between the pump cylinder 30 and the oil reservoir 40, the oil line 53 is of varying length. In a short version, it can be designed as a kind of nozzle 53 (see the figure), and in a longer version as a rigid or flexible line 53 (not shown), through which the oil reservoir 40 and the pump cylinder 30 are in fluid communication.

[0029] Furthermore, the pump cylinder 30 can be in direct fluid communication with the oil reservoir 40 at its end (not shown, but analogous to the figure, where the two oil delivery openings 33, 43 (see below) essentially coincide) or laterally (not shown). If the oil reservoir 40 is designed as an oil line 40, the pump cylinder 30 and the oil reservoir 40 in these cases have a more or less pronounced T- to L-shape, the common joint preferably having no constriction (see figure) or thickening.

[0030] Furthermore, it is possible to split the oil reservoir 40 into two sections. In this case, an upstream section of the oil reservoir 40, relative to the pump cylinder 30, can be positioned at its front or side in essentially direct fluid communication with the pump cylinder 30. Similarly, a downstream section of the oil reservoir 40, relative to the pump cylinder 30, can also be positioned at its front or side in essentially direct fluid communication with the pump cylinder 30.

[0031] The pump cylinder 30 and the oil reservoir 40, in particular a major extension of each of these two, preferably enclose an angle α that deviates from 0° or 180° (and, of course, integer multiples thereof). A preferred angle α between a longitudinal extension of the pump cylinder 30 and a longitudinal extension of the oil reservoir 40 is approximately ±45° to approximately 90°, with an angle of approximately 90° being practical, depending, of course, on the application in the machine 1. Other angles α between the pump cylinder 30 and the oil reservoir 40 are, of course, applicable, see above.

[0032] The oil reservoir 40 serves for the direct intake and / or direct discharge of oil by the oil pump 2 into the oil circuit 4, whereby the variable oil pressure p does not originate from the oil reservoir 40, but rather from the piston pump 20, 30, which is in fluid communication with the oil reservoir 40; more precisely, from the cylinder chamber 33 of the pump cylinder 30, the volume of which is variable by means of a pump piston 20. Either the pump piston 20 or the pump cylinder 30 can be movably arranged within the oil pump 2 (see below). That is, the piston pump 20, 30 draws oil into the oil circuit 4 via the oil reservoir 40 and / or discharges oil into the oil circuit 4 via the oil reservoir 40.

[0033] According to the invention, the oil reservoir 40 is arranged in the oil circuit 4 and forms a section of the oil circuit 4 through which the oil flows essentially in one direction. Furthermore, according to the invention, the piston pump 20, 30 is provided on the oil circuit 4 in the region of the oil reservoir 4 and does not form a section of the oil circuit 4 through which the oil flows essentially in one direction, but rather forms a dead-end-like area (pump cylinder 30) for the oil on the oil circuit 4, allowing inflow and outflow. In the case of a split oil reservoir 40, depending on the design of the oil pump 2, the pump cylinder 30 may be open to radial flow.

[0034] The piston pump 20, 30 comprises a movable pump piston 20 (solid double arrow: piston pump 20, 30 designed as a reciprocating piston pump 20, 30) or a stationary pump piston (20) (dashed double arrow: piston pump (20, 30) designed as a reciprocating cylinder piston pump (20, 30)). In the first case, see the figure, the movable pump piston 20 is mechanically coupled to the internally movable section 120 via an actuating surface 21 or another mechanical connection. In the second case, not shown, the stationary pump piston (20) is mechanically rigidly connected to an internally stationary section (140).

[0035] Furthermore, the piston pump 20, 30 comprises a stationary pump cylinder 30 (solid double arrow, see above) or a movable pump cylinder (30) (dashed double arrow, see above). In the first case, see the figure, the stationary pump cylinder 30 is mechanically rigidly connected to the internally stationary section 140. And in the second case, not shown, the movable pump cylinder (30) is mechanically coupled to an internally movable section (120).

[0036] In both cases, it is preferred, but not necessary, for the oil reservoir 40 to be fixed within the machine. However, in the second case, i.e., a fixed pump piston (20) and a movable pump cylinder (30) (dashed double arrow), it is necessary to provide a means of compensating for their mutual movement between the movable pump cylinder (30) and the oil reservoir 40. This can be achieved, for example, by means of a sliding guide or a flexible section (bellows, (rubber) hose, etc.) between the pump cylinder (30) and the oil reservoir (40), through which the oil to be pumped can flow.

[0037] The pump piston 20 has a conveying surface 22 within the pump cylinder 30 in its volume-variable cylinder chamber 33 (first conveying chamber 33). A return spring 34, preferably designed as a helical spring 34, is accommodated within the cylinder chamber 33. This return spring is supported on one side by the conveying surface 22 of the pump piston 20 and on the other side by a cylinder base 31 inside the cylinder chamber 33. Alternatively, the return spring 34 can be supported within the cylinder chamber 33 by an inner, at least partially circumferential, collar.

[0038] The cylinder base 31 has an oil delivery opening 32 to the oil reservoir 40. Alternatively, a cylinder wall can have the oil delivery opening (32) to the oil reservoir 40 (not shown). The oil delivery opening 32 leads to an oil delivery opening 42 in the oil reservoir 40, with the oil line 53 of varying length being arranged between the two oil delivery openings 32 and 42. In a short case, the distance between the oil delivery opening 32 of the pump cylinder 30 and the oil delivery opening 42 of the oil reservoir 40 is approximately one wall thickness of the oil reservoir 40 and / or the pump cylinder 30.

[0039] The outer cross-section of the pump piston 20 and the inner cross-section of the pump cylinder 30 are essentially congruent, with the inner cross-section of the pump cylinder 30 being slightly larger than the outer cross-section of the pump piston 20. The cross-sectional shape is, in principle, arbitrary, but a circular shape is preferred. However, any elliptical, square, rectangular, or, in particular, regularly shaped polygonal cross-section is also suitable.

[0040] The shape of the oil reservoir 40 is, in principle, arbitrary and can, for example, be that of a pipe, a shape 40 adapted to the machine 1, a (small) tank 40, etc. In the figure, the oil reservoir 40 is shown as a hydraulic pipe. The oil reservoir 40, or in particular a reservoir chamber 43 of constant volume (second pumping chamber 43) of the oil reservoir 40, is fluid-mechanically a section in the oil circuit 4.

[0041] Depending on the pumping frequency of the piston pump 20, 30 provided by the machine 1, the oil reservoir 40 can be intermittently connected to the oil circuit 4 via an inlet valve 41 and an outlet valve 44. The inlet valve 41 is specifically designed as an inlet check valve 41, and the outlet valve 44 is specifically designed as an outlet check valve 44. It is, of course, possible to install other valves 41, 44 in the oil pump 2 instead of check valves 41, 44, e.g., electrically controlled and / or regulated valves 41, 44.

[0042] The inlet check valve 41 and the outlet check valve 44 are preferably mechanically biased in the same direction, i.e., opposite to the direction of fluid flow through the reservoir chamber 43. The direction of fluid flow through the reservoir chamber 43 need not be straight; that is, the direction of fluid flow can be geometrically curved or angled, depending on the shape of the oil reservoir 40, and yet still be mechanically biased in the same direction with respect to the direction of fluid flow through the reservoir chamber 43.

[0043] The inlet valve 41 or the inlet check valve 41 is characterized in that it is provided upstream or immediately upstream of the reservoir chamber 43, and in some embodiments also upstream or immediately upstream of the cylinder chamber 33. In the latter two cases, the inlet valve 41 or the inlet check valve 41 can open / close directly at the reservoir chamber 43 or directly at the cylinder chamber 33, respectively.

[0044] The outlet valve 44 or the outlet check valve 44 is characterized in that it is provided downstream or immediately downstream of the reservoir chamber 43, and in some embodiments also downstream or immediately downstream of the cylinder chamber 33. In the latter two cases, the outlet valve 44 or the outlet check valve 44 can open / close directly at the reservoir chamber 43 or directly at the cylinder chamber 33.

Claims

[1] Oil pump (2) for a machine (1), in particular a fluid machine (1), preferably a compressor (1) or a piston compressor (1), for household, transport or industry use, with a piston pump (20, 30) whose cylinder chamber (33) serves to draw in and expel oil in an oil circuit (4) of the machine (1), characterized by , that the cylinder chamber (33) is in fluid communication with a reservoir chamber (43) of an oil reservoir (40) of the oil pump (2), wherein an oil pressure (p) can be imposed on the reservoir chamber (43) by means of the cylinder chamber (33) and the oil can be drawn in and expelled by means of the reservoir chamber (43). [2] Oil pump (2) according to the preceding claim, characterized by , that: • the cylinder chamber (33) is set up as a first pumping chamber (33) in the piston pump (20, 30) whose volume can be changed by a pump piston (20) and a pump cylinder (30), • the reservoir space (43) is set up away from the piston pump (20, 30) as a second pumping space (43) in the oil pump (2) with essentially constant volume, and / or • the pump piston (20) is designed as a movable pump piston (20) and the pump cylinder (30) as a stationary pump cylinder (30) in the oil pump (2), or • the pump piston (20) is designed as a stationary pump piston (20) and the pump cylinder (30) as a movable pump cylinder (30) in the oil pump (2). [3] Oil pump (2) according to one of the preceding claims, characterized by , that: • in the oil circuit (4) the reservoir space (43) upstream has an inlet valve (41) designed in particular as an inlet check valve (41), • in the oil circuit (4) the reservoir space (43) downstream has an outlet valve (44) designed in particular as an outlet check valve (44), and / or • the inlet check valve (41) and the outlet check valve (44) are mechanically biased against the direction of oil flow through the reservoir chamber (43). [4] Oil pump (2) according to any one of the preceding claims, characterized by , that: • the cylinder chamber (33) and the reservoir chamber (43) are in an unthrottled or a throttled essentially direct fluid communication, • the cylinder chamber (33) opens essentially directly onto the reservoir chamber (43) or an oil line (53) is installed between the cylinder chamber (33) and the reservoir chamber (43), and / or • the cylinder chamber (33) or the oil line (53) between the inlet valve (41) and the outlet valve (44) of the reservoir chamber (43) opens into the reservoir chamber (43). [5] Oil pump (2) according to any one of the preceding claims, characterized by, that the cylinder chamber (33) and the reservoir chamber (43) are arranged separately from each other in the oil pump (2) such that: • a conveying direction of the cylinder chamber (33) and a conveying direction of the reservoir chamber (43) have an angle (α) different from 0° and 180°, • the conveying direction of the cylinder chamber (33) and a conveying direction of the reservoir chamber (43) enclose an angle (α) of approximately: 5°, 15°, 30°, 45°, 60°, 75°, 90°, each ±10°, and / or • a quotient of a volume of the oil reservoir (40) to a delivery volume of the piston pump (20, 30) approx.: 10; 9; 8; 7; 6; 5; 4; 3; 2, 1; 0.9; 0.8; 0.7; 0.6; 0.5; 0.4; 0.3; 0.2; 0.1 each ±10-25%. [6] Oil pump (2) according to one of the preceding claims, characterized by , that: • a return spring (34), in particular designed as a helical spring (34), is provided in the cylinder chamber (33) of the piston pump (20, 30), • when pumping oil using the piston pump (20, 30), oil can be pumped into the return spring (34) and pumped out of the return spring (34) again, and / or • the return spring (34) is mechanically supported radially outside an oil delivery opening (32) in the cylinder base (31) of the pump cylinder (30). [7] Oil pump (2) according to one of the preceding claims, characterized by , that: • the reservoir space (43) is straight, curved or angled, • the reservoir space (43) is designed as a possibly widened section in an oil line of the machine (1), and / or • the pump piston (20) does not have a through-hole for oil delivery by means of the oil pump (2). [8] Machine (1), in particular fluid machine (1), preferably compressor (1) or piston compressor (1), for household, transport or industry use, wherein the machine (1) has an oil sump (100) or other oil reservoir from which oil can be pumped into an oil circuit (4) of the machine (1) by means of an oil pump (2) of the machine (1), characterized by , that the oil pump (2) is designed according to one of the preceding claims. [9] Machine (1) according to the preceding claim, characterized by , that: • the oil reservoir (40) of the oil pump (2) is integrated into the oil circuit (4) of the machine (1), whereas the piston pump (20, 30) of the oil pump (2) is connected to the oil circuit (4) of the machine (1), • in operation of the machine (1) the oil reservoir (40) of the oil pump (2) is accessible to oil flow in essentially one direction, and / or • in operation of the machine (1) oil can flow into the pump cylinder (30) of the oil pump (2) in one direction and flow out in the opposite direction. [10] Machine (1) according to any one of the preceding claims, characterized by , that: • the pump piston (20) or the pump cylinder (30) is mechanically coupled to a movable section (120) of the machine (1), • the pump cylinder (30) or the pump piston (20) is rigidly connected to a stationary section (140) of the machine (1), and / or • the oil reservoir (40) is rigidly connected to a stationary section (140) of the machine (1). [11] Machine (1) according to any one of the preceding claims, characterized by , that: • an upstream section of the reservoir space (43) in the oil circuit (4) can be brought into fluid communication with the oil sump (100) or the other oil storage reservoirs in the oil circuit (4) of the machine (1) via the inlet valve (41), • a downstream section of the reservoir space (43) in the oil circuit (4) can be brought into fluid communication with a section of the machine (1) via the outlet valve (44), and / or • is fluid-mechanically connected to the oil circuit (4) between the inlet valve (41) and the outlet valve (44) of the pump cylinders (30) of the piston pump (20, 30). [12] Machine (1) according to any one of the preceding claims, characterized by , that: • the piston pump (20, 30) or the oil pump (2) is designed as a bearing and / or a damper within the machine (1), • the oil pump (2) is installed at least partially or substantially entirely in the oil sump (100) or the other oil reservoir, and / or • an open fluid circuit or a closed fluid circuit can be operated by means of the machine (1).

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