Improved flushing circuit for hydraulic machines

Abstract

A fluid pressure machine (100) including an improved sweep circuit adapted to form a primary sweep flow (F1) circulating from an inlet orifice (210) successively through a base end (110), an intermediate section (120), and a distal end (130) of the fluid pressure machine (100), and then through said intermediate section (120) and said base end (110) to an outlet orifice (220).

Description

Technical Field

[0001] This disclosure relates to a fluid pressure machine including an improved Flushing system.

Background Art

[0002] FIG. 1 schematically depicts an example of a fluid pressure machine structure, such as a fluid pressure pump or a fluid pressure motor.

[0003] The schematized fluid pressure machine 100 has a shaft 102 extending along the main axis X-X. Schematically, several parts can be defined for the fluid pressure machine 100. That is, there are a base end portion 110, an intermediate portion 120, and a tip end portion 130. The terms base end and tip end are arbitrarily defined with respect to the main axis X-X and are used herein to identify the positions of different elements.

[0004] The base end portion 110 has a distribution supply function. The base end portion 110 includes a distributor 112, more generally means for ensuring the supply and discharge of fluid, typically two ducts defining a duct considered as a high-pressure (HP) duct and a duct considered as a low-pressure (LP) duct.

[0005] The intermediate portion 120 defines the fluid torque of the fluid pressure machine 100. The intermediate portion 120 includes a cylinder block 122 including a plurality of housings to which pistons 124 are slidably attached, and the pistons 124 contact a multi-lobe cam 126.

[0006] The tip end portion 130 typically includes bearings of the fluid pressure machine 100. In the example depicted, the tip end portion includes two tapered roller bearings 132 forming a rolling bearing for ensuring the relative rotational movement of the fluid pressure machine. The tip end portion 130 can also include other elements, such as a braking device.

[0007] Figure 1 schematically depicts an example of a closed-loop circuit of the fluid pressure machine 100, which includes a fluid pressure pump 10 coupled to a primary motor M that ensures rotational drive. The fluid pressure pump 10 has two orifices defining an inlet and an outlet, and these inlet and outlet are connected to an outlet and inlet formed at the base end 110 of the fluid pressure machine 100, respectively, forming a closed fluid pressure circuit with two branches, optionally called a high-pressure HP branch and a low-pressure LP branch.

[0008] Therefore, in the fluid pressure machine 100, the closed-loop circuit corresponds to a circuit through which the working fluid of the fluid pressure machine 100, typically oil, circulates, relating to the rotational motion of the fluid pressure machine 100. The closed-loop circuit also includes a booster pump 12, which can be coupled to this same primary motor M or driven by another element. The booster pump 12 is connected to the duct of the fluid pressure circuit via a check valve 14 to ensure a pressure increase in the fluid pressure circuit.

[0009] In such a fluid pressure machine 100, the closed-loop circuit of the fluid pressure machine 100 is distinguished by its internal volume. Figure 1 schematically illustrates the closed-loop circuit with dotted lines and the internal volume with hatching.

[0010] The internal volume of the fluid pressure machine 100 is defined here as the space within the fluid pressure machine, which is not part of the closed loop and typically has an internal pressure much lower than the pressure of the working fluid in the fluid pressure machine, for example, a pressure close to atmospheric pressure or ambient pressure. The closed loop circuit is typically sealed and isolated from the internal volume using a suitable sealing element.

[0011] The working fluid, which circulates within the closed-loop circuit and moves through different components of the fluid pressure circuit, such as pumps, motors, ducts, and various restrictive parts, is prone to becoming hot, particularly due to friction between different internal elements of the fluid pressure machine 100 and pressure drops.

[0012] It is known that an exchange function is provided to cool the fluid circulating within the closed-loop circuit, in which oil considered "hot" is removed from the closed-loop on the lowest-pressure line by an exchange valve 16 and exchanged for an equal amount of oil obtained from a tank R by the booster pump 12 and the circuit elements associated with the pressure boost, but this oil is at a lower temperature and is typically filtered. Thus, such a function can lower the temperature of the oil circulating within the closed-loop.

[0013] However, as described above, the internal volume of the fluid pressure machine 100 is sealed and separated from the closed loop, and as a result, the oil contained in the internal volume of the fluid pressure machine 100 is not cooled during the exchange.

[0014] Therefore, in order to cool the internal volume, the internal volume of the fluid pressure machine 100 is cooled using a fluid introduced into the internal volume (for example, taken in from the low-pressure branch of the fluid pressure circuit by the exchange valve, or obtained directly from the booster pump). Flushing It is known that this process is performed, and then the same amount of fluid is discharged through a drain.

[0015] However, the currently proposed solution does not account for the entire internal volume. Flushing It is not possible to do so, or the supply duct and discharge duct are distributed to the different parts of the fluid pressure machine 100, for example, the base end 110 and the tip end 130. Flushing The flow needs to be defined, which is constrained in terms of embedding and maintenance. Adding further ducts would create additional problems in terms of actual access and increase the risk of duct rupture.

[0016] Another known solution involves utilizing the leakage from the closed loop into the internal volume of the fluid pressure machine 100 in relation to a drain added to the casing of the fluid pressure machine 100. FlushingThe solution is to do this. Even in this case, such a solution is insufficient because it cannot cool the entire internal volume, especially the part furthest from the area where the leakage occurs and the drain. Flushing It is known that this will happen.

[0017] In any of the proposed structures, the internal volume of the motor is sufficiently Flushing When not done, the oil present in the internal volume may become hot, particularly due to friction or pressure drop between different moving parts, and especially the Flushing Areas of the internal volume far from the fluid inlet or outlet may become hotter than the replaced oil. [Overview of the project] [Problems that the invention aims to solve]

[0018] This disclosure aims to address these issues at least partially. [Means for solving the problem]

[0019] Disclosure of the invention To address these problems at least partially, the present invention includes a fluid pressure machine comprising an assembly comprising a first assembly and a second assembly rotatable relative to each other along a main axis, wherein the first assembly comprises a shaft (102) and the second assembly comprises a casing. The fluid pressure machine has three parts that extend continuously along the main shaft from the base to the tip, namely: - a base end including a distributor, a fluid supply duct, and a fluid discharge duct; - an intermediate part including a cylinder block and a cam; and - a tip part including a bearing. The aforementioned fluid pressure machine has an internal volume, and the internal volume Flushing Includes a circuit for the purpose of Flushing The circuit has a fluid inlet orifice at the base end and a fluid outlet orifice (220) at the base end. The aforementioned FlushingThe circuit is configured to circulate continuously from the inlet orifice into the base end portion, the intermediate portion, and the tip end portion of the fluid pressure machine, and then circulate within the intermediate portion and the base end portion of the fluid pressure machine to reach the outlet orifice, forming a primary Flushing flow. It relates to an assembly.

[0020] According to one example, the Flushing circuit defines two flows within the internal volume of the fluid pressure machine, namely - the primary flow and - the secondary flow. The primary flow and the secondary flow are injected into the fluid pressure machine through the fluid inlet orifice and exit the fluid pressure machine through the fluid outlet orifice.

[0021] According to one example, the secondary flow defines the circulation of the fluid within the base end portion between the fluid inlet orifice and the fluid outlet orifice.

[0022] According to one example, the primary flow and the secondary flow are adjusted using throttles that define a maximum flow rate for each of the flows.

[0023] According to one example, the tip end portion of the fluid pressure machine includes a braking device.

[0024] According to one example, the assembly is adapted to obtain the working fluid from the lowest pressure duct among the supply duct and the discharge duct of the fluid pressure machine and inject the working fluid into the Flushing fluid inlet orifice of the circuit, and includes a switching valve.

[0025] According to one example, the switching valve is incorporated in the distribution cover of the fluid pressure machine.

[0026] According to one example, the assembly is adapted to obtain the working fluid from a booster circuit associated with the fluid pressure machine or from a control circuit associated with the fluid pressure machine, and includes a Flushing valve.

[0027] For example, the above Flushing The circuit extends from the inlet orifice to the tip of the fluid pressure machine. Flushing To transport the fluid, and Flushing The fluid pressure machine includes a duct formed in the distributor and / or the shaft and / or the cylinder block of the fluid pressure machine to inject fluid into the internal volume of the tip of the fluid pressure machine.

[0028] In this case, typically, the tip portion includes a sleeve positioned around the shaft and pressed against the cylinder block, the pressing of the sleeve against the cylinder block is performed using a sealing element, and the sleeve is configured to define a fluid passage along the shaft to the tip of the internal volume of the tip portion of the fluid pressure machine.

[0029] The present invention and its advantages will be better understood by reading the detailed description below of different embodiments of the invention, which are provided as non-limiting examples. [Brief explanation of the drawing]

[0030] [Figure 1] As explained earlier, this is a schematic diagram illustrating an example of a fluid pressure machine. [Figure 2] This figure shows an example of a fluid pressure machine according to one aspect of the present invention. [Figure 3] This figure shows an example of a fluid pressure machine according to one aspect of the present invention. [Figure 4] This figure shows an example of a fluid pressure machine according to one aspect of the present invention. [Figure 5] This figure shows an example of a fluid pressure machine according to one aspect of the present invention.

[0031] In all of the above drawings, common elements are identified by the same reference number. [Modes for carrying out the invention]

[0032] Figure 2 shows an example of a fluid pressure machine according to one aspect of the present invention. This figure contains different elements that have already been described with reference to Figure 1. Thus, the schematic fluid pressure machine 100 has a shaft 102 extending along the main axis X-X. Schematically, the fluid pressure machine 100 can be defined in several parts: namely, a base portion 110, an intermediate portion 120, and a tip portion 130, the designations of base and tip are arbitrarily determined with respect to the main axis X-X.

[0033] The base end 110 has a distribution and supply function. The base end 110 includes a distributor 112 surrounded by a distribution cover 113, more generally means for supplying and discharging fluid, and two ducts 114 defining a duct typically considered to be a high-pressure duct and a duct considered to be a low-pressure duct, the two ducts 114 here formed in the distribution cover 113.

[0034] The intermediate section 120 generally defines the portion of the fluid torque of the fluid pressure machine 100. The intermediate section 120 includes a cylinder block 122 which includes a plurality of housings on which pistons 124 are slidably mounted, and the pistons 124 are in contact with a multilobe cam 126.

[0035] The tip section 130 typically includes bearings for the fluid pressure machine 100. In the example described above, the tip section includes two tapered roller bearings 132 that form a rolling bearing to ensure the relative rotational motion of the fluid pressure machine 100, a braking device 134 adapted to selectively apply a frictional force to counteract the rotational motion of the fluid pressure machine 100, and a dynamic seal. The braking device 134 in the description includes a stack of discs 135 and an actuator 137 adapted to selectively engage or disengage the stack of discs 135, and thus to apply or not apply a resistance force to counteract the rotational motion of the fluid pressure machine 100.

[0036] As stated in the preamble, considering that the fluid pressure connector is located at the base end 110, the problem is the fluid in the internal volume of the intermediate portion 120 and the internal volume of the tip portion 130. Flushing This relates to the following. The internal volume of the fluid pressure machine 100 refers to the volume inside the casing of the fluid pressure machine 100, but means a volume that is distinct from the duct through which the fluid pressure working fluid of the fluid pressure machine 100 circulates.

[0037] The hydraulic machine 100 is defined to have a first assembly and a second assembly, which are mounted to rotate relative to each other around the main shaft X-X via the bearing 132. One of the first and second assemblies is typically fixed and forms the stator of the hydraulic machine 100, while the other of the first and second assemblies is movable and forms the rotor of the hydraulic machine 100.

[0038] In the illustrated example, the shaft 102 and the cylinder block 122 form a first assembly, the cam 126, the distribution cover 113, and more generally the casing of the fluid pressure machine 100 form a second assembly, the first assembly being rotatable relative to the second assembly along the main shaft X-X.

[0039] Advantageously, although optional, the fluid pressure machine 100 according to the present invention may include one or any combination of the following features: That is, the fluid pressure machine 100 is a fluid pressure motor, the fluid pressure machine 100 is a fluid pressure machine with radial pistons, the fluid pressure machine 100 includes a cam provided with several lobes, the fluid pressure machine 100 includes a casing formed by two lateral casing elements constituting a central annular casing element, a cam including a lobe cam formed on the radial inner surface of the central casing element, a cylinder block mounted to rotate relative to the cam within the casing about axis X-X and facing the cam, a shaft connected to rotate with the cylinder block, a piston guided to slide radially within each cylinder of the cylinder block and pressing against the lobes of the cam via rollers, and a planar distributor adapted to ensure fluid connection between the cylinder block and the cylinders, wherein the piston continuously presses against the lobes of the cam, causing relative rotation of the cylinder block and elements connected to the cylinder block with respect to the casing.

[0040] The fluid pressure machine 100 proposed herein is generally referred to by reference number 200. Flushing The circuit, wherein the internal volume of the base portion 110, the intermediate portion 120, and the tip portion 130 Flushing It is adapted to ensure that the fluid inlet and outlet orifices are located only at the base end 110. Flushing Includes means for defining a circuit.

[0041] More specifically, the fluid pressure machine 100 includes an inlet orifice 210 and an outlet orifice 220, and between the orifices Flushing Circuit 200 is formed. In the illustrated example, the inlet orifice 210 and the outlet orifice 220 are formed in the distribution cover 113.

[0042] In one example, the inlet orifice 210 is connected to a valve valve 240 adapted to obtain a fluid flow rate from a fluid pressure circuit associated with the fluid pressure machine and to transport this obtained flow rate to the inlet orifice 210. The valve valve 240 may or may not be incorporated into the fluid pressure machine 100. The valve valve 240 may be added to the fluid pressure machine 100, for example, by being mounted on a flange fixed to the fluid pressure machine 100. The drawing schematically depicts the valve valve 240 connected to a fluid pressure duct that ensures the circulation of the fluid pressure working fluid of the fluid pressure machine 100.

[0043] Therefore, the exchange valve 240 is typically configured to take fluid from the low-pressure duct connected to the fluid pressure machine 100, typically from the outlet in the case of a fluid pressure motor, or from the inlet in the case of a fluid pressure pump.

[0044] As one variation, the above Flushing This can be done in parallel with the replacement circuit.

[0045] As one variation, the inlet orifice 210 reaches Flushing The fluid can be obtained from the booster pump 12. As a variation, Flushing The fluid may be obtained from a control circuit associated with the fluid pressure machine 100. As one variation, Flushing The fluid may be obtained from a high-pressure duct connected to the fluid pressure machine 100, in which case the Flushing The fluid is discharged through the pressure reducer. Flushing It can be incorporated into the circuit. As one variation, the above Flushing The fluid can be obtained from a high-pressure duct inside the fluid pressure machine 100. These embodiments are not limiting, and the above Flushing It should be understood that the fluid can be obtained from any suitable fluid source. The fluid is typically oil.

[0046] The outlet orifice 220 is typically connected, via a filter and / or heat exchanger, to a tank R, which is typically the ambient pressure of the fluid pressure circuit associated with the fluid pressure machine 100.

[0047] Therefore, within the internal volume of the fluid pressure machine 100 Flushing The fluid used to perform the operation is typically the same fluid used to operate the fluid pressure machine 100, provided that the fluid used within the internal volume of the fluid pressure machine is the same fluid used to perform the operation. Flushing The fluid used in this process is at a pressure significantly lower than the pressure of the fluid in the supply duct and discharge duct of the fluid pressure machine 100. Flushing The fluid performing this action should be understood to be the internal pressure within the internal volume of the casing of the fluid pressure machine 100, as opposed to the fluid which is considered the working fluid that circulates within the fluid pressure duct of the fluid pressure machine in relation to the movement of the piston.

[0048] The aforementioned Flushing The circuit 200 defines the primary flow F1 and the secondary flow F2 that circulate within the internal volume of the fluid pressure machine 100.

[0049] The distribution of the fluid between the primary flow F1 and the secondary flow F2 is performed, for example, typically by adjusting the section downstream of the inlet orifice 210, or by any other suitable means that allows the fluid flow to be divided into two flows. For example, a maximum flow rate that can be carried to the secondary flow F2 is defined, in which case the remaining flow rate is carried to the primary flow F1, or vice versa, a maximum flow rate that can be carried to the primary flow F1 is defined, in which case the remaining flow rate is carried to the secondary flow F2. It is also possible to define the maximum flow rate that can be carried to the primary flow F1 and the maximum flow rate that can be carried to the secondary flow F2.

[0050] The illustrated example is a first-order system, schematically represented by arrows F1 and F2, respectively. Flushing Flow F1 and secondary Flushing The flow F2 is defined. Flushing Flow F1 and the secondary Flushing Flow F2 is schematically represented here as being separated from the inlet orifice 210. However, this embodiment is not limiting, and it should be understood that the separation into two flows can be performed at any point downstream of the inlet orifice 210.

[0051] In the example shown in Figure 2, the primary flow F1 takes the following path from the inlet orifice 210 to the outlet orifice 220: the fluid enters the fluid pressure machine 100 through the inlet orifice 210 formed in the distribution cover 113. - The fluid passes through the duct formed in the distribution cover 113 and reaches the interface with the distributor 112. - The fluid passes through the distributor 112 via a duct formed in the distributor 112 and reaches the interface with the cylinder block 122. This interface is typically a circular groove formed in the distributor 112 or the cylinder block 122. - The fluid passes through the cylinder block 122 via a duct located within the cylinder block 122, then expands into the volume of the tip portion 130 between the shaft 102 and the sleeve 136, and reaches the tip of the internal volume. The sleeve 136 is typically mounted to press against the cylinder block 122, and a sealing element is provided at the interface between these elements to guide the fluid through the passage between the shaft 102 and the sleeve 130. - The fluid then passes through different elements of the tip portion 130 of the fluid pressure machine 100, namely the braking device 134 and the bearing 132. - The fluid then flows through a bore formed in the sleeve 136 and joins the internal volume of the intermediate section 120. - The fluid passes through the intermediate section 120, for example, by passing through a radially outward passage from the main shaft X-X, bypassing the cylinder block 122, and merges with the base end 110, and then flows out from the base end 110 through the outlet orifice 220.

[0052] The secondary flow F2 follows the following path: - The fluid enters the fluid pressure machine 100 through the inlet orifice 210 formed in the distribution cover 113; - The fluid spreads through a duct formed in the distribution cover 113 into the internal volume of the fluid pressure machine between the cylinder block 122 and the distribution cover 113; - The fluid flows out through the outlet orifice 220.

[0053] Therefore, due to the relationship between the primary flow F1 and the secondary flow F2, the fluid in the internal volume of the different parts of the fluid pressure machine 100 Flushing This makes it possible to ensure cooling and lubrication of the different parts of the fluid pressure machine 100 while holding the fluid supply duct collected at the base end 110 of the fluid pressure machine 100.

[0054] However, it should be understood that the embodiment shown in Figure 2 is not limited to this example.

[0055] The following drawings illustrate other different embodiments. Below, only the differences from the embodiments already described with reference to Figure 2 will be explained.

[0056] In the example depicted in Figure 3, the tip portion 130 does not include the braking device 134, but only includes the bearing 132 that defines the rolling bearing for the fluid pressure machine 100.

[0057] In this embodiment, the primary flow F1 takes the following path from the inlet orifice 210 to the outlet orifice 220. That is, - the fluid enters the fluid pressure machine 100 through the inlet orifice 210 formed in the distribution cover 113; - the fluid passes through a duct formed by the radial clearance between the distributor 112 and the shaft 102; - the fluid passes through a duct formed by the bore of the shaft 102 and exits from the tip of the tip portion 130 of the fluid pressure machine 100; - the fluid then passes through the different elements of the tip portion 130 of the fluid pressure machine 100, in this case the bearing 132; - the fluid then merges into the internal volume of the intermediate portion 120; - the fluid passes through the intermediate portion 120 by, for example, a radially outward passage from the main shaft X-X, bypassing the cylinder block 122, and merges into the base portion 110, and exits from the base portion 110 through the outlet orifice 220.

[0058] Therefore, in this embodiment, the fluid in the internal volume of the different parts of the fluid pressure machine 100 Flushing This makes it possible to ensure cooling and lubrication of the different parts of the fluid pressure machine 100 while holding the fluid supply duct collected at the base end 110 of the fluid pressure machine 100. Flushing There is a circuit.

[0059] Figure 4 shows another embodiment.

[0060] In this example, the primary flow F1 is transported from the inlet orifice 210 to the distributor cover 113, the multilobe cam 126, and the tip cover 138, that is, to the tip section 130 through a duct located in the casing of the fluid pressure machine 100.

[0061] Therefore, the primary flow F1 is reinjected at the tip of the internal volume of the tip portion 130. The primary flow F1 then passes through the internal volume of the tip portion 130, then passes through the intermediate portion 120 by bypassing the cylinder block 122, for example, through a radially outward passage from the main spindle X-X, and merges with the base portion 110 to reach the outlet orifice 220.

[0062] Figure 5 shows another embodiment.

[0063] This embodiment is a variation of Figure 3 above, in which the duct formed by the bore of the shaft 102 is replaced by a bore formed in the cylinder block 122 and a bore formed in the inner ring of one of the bearings 132.

[0064] Therefore, the primary flow F1 spreads into the tip portion 130 between the two bearings 132, then passes through one of the bearings 132 to merge into the intermediate portion, passes through the intermediate portion 120, merges into the base portion 110, and reaches the outlet orifice 220.

[0065] Therefore, in view of the above-mentioned different embodiments, the present invention generally relates to the primary within the internal volume of the fluid pressure machine 100. Flushing This proposes defining flow F1, and the primary Flushing Flow F1 enters and exits the fluid pressure machine 100 through the base end of the fluid pressure machine 100, circulating the fluid in the different parts of the fluid pressure machine 100, i.e., passing continuously through the base end 110, the intermediate part 120, and the tip end 130, and then passing again through the intermediate part 120 and the base end 110 before exiting the fluid pressure machine 100. Flushing It should be understood that this ensures fluid circulation.

[0066] Therefore, this Flushing The primary fluid flow F1 ensures lubrication and cooling of the distinct parts of the fluid pressure machine 100. FlushingDue to the secondary flow F2 of the fluid, typically within the base end 110 and the intermediate section 120 of the fluid pressure machine 100 Flushing A parallel fluid flow is ensured to provide lubrication and cooling for the distribution components of the fluid pressure machine 100 and the elements associated with the cylinder block 122.

[0067] Therefore, the primary flow F1 and the secondary flow F2 are regulated, for example, through a section that determines the maximum flow rate for one or both of these flows. Typically, the primary flow F1 and the secondary flow F2 merge at the intermediate section 120 or the base section 110 of the fluid pressure machine 100 before reaching the outlet orifice 220.

[0068] Therefore, the above Flushing At least a portion of the fluid circulates throughout the entire internal volume of the fluid pressure machine 100, reaching components located in the part of the fluid pressure machine 100 furthest from the inlet orifice 210 and the outlet orifice 220, and neither of these orifices needs to be in the middle or tip, and / or Flushing It does not require the addition of other inlet or outlet orifices for the fluid.

[0069] Therefore, the proposed invention makes it possible to propose a fluid pressure machine 100 having fluid intake and discharge ducts only at the base end of the fluid pressure machine 100, and thus further within the fluid pressure machine 100 Flushing Regarding a fluid pressure mechanical structure to which additional fluid pressure ducts are added to define the flow, it becomes possible to maintain minimal space requirements and simple assembly for the fluid pressure machine 100.

[0070] fluid Flushing By ensuring this, it becomes possible to avoid temperature rise and / or premature wear in the different parts of the fluid pressure machine 100.

[0071] The assembly according to the present invention can be applied to a hydraulic machine 100 associated with a closed-loop or open-loop hydraulic circuit.

[0072] While the present invention has been described with reference to specific exemplary embodiments, it is evident that these examples can be modified and altered without departing from the general scope of the invention as defined by the claims. In particular, the individual features of the different illustrated / referred embodiments can be combined in further embodiments. Therefore, the above description and drawings should be understood as illustrative rather than restrictive.

[0073] Furthermore, it is clear that all features described with reference to one method can be transferred to a single device, either individually or in combination, and conversely, all features described with reference to a single device can be transferred to a single method, either individually or in combination.

Claims

1. It is an assembly, A fluid pressure machine (100) includes a first assembly and a second assembly that are rotatable relative to each other along a main axis (X-X), wherein the first assembly includes a shaft (102) and the second assembly includes a casing. The fluid pressure machine (100) has three parts that extend continuously from the base end to the tip along the main shaft (X-X), namely, A distributor (112) and a base end (110) including a fluid supply duct and a fluid discharge duct, An intermediate section (120) including a cylinder block (122) and a cam (126), It has a tip portion (130) including a bearing (132), The fluid pressure machine (100) has an internal volume and includes a circuit (200) for flushing the internal volume, the flushing circuit (200) having a fluid inlet orifice (210) at the base end (110) and a fluid outlet orifice (220) at the base end (110), An assembly in which the flushing circuit (200) is configured to continuously circulate from the fluid inlet orifice (210) through the base end (110), the intermediate section (120), and the tip end (130) of the fluid pressure machine (100), and then circulate through the intermediate section (120) and the base end (110) to form a primary flushing flow (F1) that reaches the fluid outlet orifice (220).

2. The flushing circuit (200) creates two flows within the internal volume of the fluid pressure machine (100), namely The primary flushing flow (F1) and, The secondary flow (F2) is defined, The assembly according to claim 1, wherein the primary flushing flow (F1) and the secondary flow (F2) are injected into the fluid pressure machine (100) through the fluid inlet orifice (210) and exit the fluid pressure machine through the fluid outlet orifice (220).

3. The assembly according to claim 2, wherein the secondary flow (F2) defines the circulation of fluid within the base end (110) between the fluid inlet orifice (210) and the fluid outlet orifice (220).

4. The assembly according to claim 2 or 3, wherein the primary flushing flow (F1) and the secondary flow (F2) are controlled using a throttle that determines the maximum flow rate for each of the flows (F1, F2).

5. The assembly according to claim 1, wherein the tip portion (130) of the fluid pressure machine (100) includes a braking device (134).

6. The assembly according to claim 1, comprising a replacement valve (240) adapted to obtain working fluid from the lowest-pressure duct among the supply duct and discharge duct of the fluid pressure machine, and to inject the working fluid into the fluid inlet orifice (210) of the flushing circuit (200).

7. The assembly according to claim 6, wherein the exchange valve (240) is incorporated into the distribution cover (113) of the fluid pressure machine (100).

8. The assembly according to claim 1, wherein the flushing circuit is supplied from a booster circuit associated with the fluid pressure machine (100) or from a control circuit associated with the fluid pressure machine (100).

9. The assembly according to claim 1, wherein the flushing circuit (200) includes a duct formed in the distributor (112) and / or the shaft (102) and / or the cylinder block (122) of the fluid pressure machine (100) to transport flushing fluid from the fluid inlet orifice (210) to the tip (130) of the fluid pressure machine (100) and to inject the flushing fluid into the internal volume of the tip (130) of the fluid pressure machine (100).

10. The assembly according to claim 9, wherein the tip portion (130) includes a sleeve (136) positioned around the shaft (102) and pressed against the cylinder block (122), the pressing of the sleeve (136) against the cylinder block (122) is performed using a sealing element, and the sleeve (136) is configured to define a fluid passage along the shaft (102) to the tip of the internal volume of the tip portion (130) of the fluid pressure machine (100).

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