Pump assembly, especially for an adjustable chassis system

Abstract

Pump assembly comprising a pump and a pump drive and an annular reservoir at least partially surrounding the pump and the pump drive, wherein the reservoir comprises a volume of hydraulic pressure medium and a volume of gas spatially separated therefrom within a rigid reservoir housing, wherein the volume of gas is accommodated in a flexible envelope within the reservoir housing isolated from the volume of pressure medium.

Description

Technical Field

[0001] This invention relates to pump assemblies, particularly for adjustable chassis systems. Background Technology

[0002] DE 10 2015 208 785 A1 describes an adjustable chassis system with a pump assembly. According to... Figure 4 The embodiment shown illustrates a pump assembly having a ring-shaped memory that surrounds at least one longitudinal section of the pump assembly. The specific structural design of the pump assembly, and particularly the memory, is not the subject of DE 10 2015 208 785 A1.

[0003] A pump assembly, known from DE 10 2018 129 539 A1, as part of an operating module for a transmission system, has an annular memory. Here, the memory also surrounds at least a portion of the pump assembly. The annular memory includes an axially movable annular piston that separates a gas space from a pressure medium space. Summary of the Invention

[0004] The purpose of this invention is to improve the design of a ring-shaped memory in a pump assembly.

[0005] This objective is achieved by containing the gas volume within a flexible encapsulation inside the memory housing, which is isolated from the pressure medium volume.

[0006] The use of flexible encapsulation significantly improves noise emissions. The air column within the encapsulation reduces the sound transmitted from the pump and pump drive into the environment.

[0007] To reduce the mechanical load on the encapsulation, the encapsulation has an arcuate shape that matches the cross-section of the memory. Here, the encapsulation is at least partially supported by the wall of the memory housing.

[0008] Optionally, multiple encapsulations can be arranged in the memory. Multiple encapsulations allow for the determination of the pressure medium volume or the dimensions of the pressure characteristic line while maintaining a constant memory size.

[0009] According to an advantageous design, the encapsulation has a filling connection that passes through the wall of the memory housing. Therefore, filling of the encapsulation can also be performed during assembly only when needed.

[0010] Furthermore, it can be specified that at least one filling connection of the encapsulation body and a filling connection for the pressure medium are arranged in a common area of ​​the memory housing. This feature is particularly advantageous in confined installation spaces where the two connections can be arranged directly side by side.

[0011] When needed, the filling connection may also have a fusible section to allow for controlled gas extraction, for example, in the event of a fire, so that the memory is not overloaded.

[0012] Alternatively, at least two memories may also be arranged stacked axially and have mutually facing contact surfaces for hydraulic connection between the at least two memories. In this case, standard memories can be used, and then their quantity can be increased to the desired memory volume by stacking them.

[0013] Alternatively, at least two memories may be arranged concentrically, wherein the outer peripheral surface of the inner memory's casing forms the inner peripheral surface of the outer memory's casing. Attached Figure Description

[0014] The invention is further illustrated below with reference to the accompanying drawings. Wherein:

[0015] Figure 1 The application principle diagram of the pump assembly is shown;

[0016] Figure 2 A cross-sectional view of the pump assembly is shown;

[0017] Figure 3 A pump assembly with memory stacked axially is shown;

[0018] Figure 4 The pump assembly is shown, in which the memory is arranged concentrically;

[0019] Figure 5 A memory with multiple encapsulated bodies is shown. Detailed Implementation

[0020] Figure 1 A schematic diagram of the combination of pump assembly 1 and vibration damper 3 is shown. Pump assembly 1 includes pump 5 and pump driver 7. The present invention is particularly suitable and meaningful for use with pump 5 having uneven delivery, such as gear pump. In particular, pump 5 with uneven delivery can produce noise emissions, for example, that are carried into the passenger compartment.

[0021] Pump assembly 1 has an annular reservoir 9, which at least partially surrounds pump 5 and pump driver 7. Pump 5 preferably has two delivery directions. Valves and other components of the hydraulic system are not shown. Reservoir 9 has a rigid reservoir housing 11, in which a hydraulic pressure medium volume 13 and a spatially separated gas volume 15 are contained. Gas volume 15 is contained within a flexible encapsulation 17 isolated from the pressure medium volume 13 within the reservoir housing 11. Encapsulation 17 floats within the pressure medium volume 13. Unlike the surrounded liquid, the gas within encapsulation 17 exhibits significantly lower sound transmission. Therefore, encapsulation 17 provides sound insulation for pump assembly 1.

[0022] If still Figure 5 As shown, the encapsulation 17 has an arcuate shape matching the cross-section of the memory 9 and is at least partially supported at the wall of the memory housing 11. The radial support of the encapsulation 17 ensures a relatively low hydraulic load on the encapsulation 17. Multiple encapsulations 17 can also be arranged in the memory, such as a standardized memory, and introduced into the memory housing 11 as needed.

[0023] according to Figure 1 The damper 3 is based on a cylinder 19, in which a piston rod 21, together with a piston 23 equipped with a valve, performs axial displacement movement. The damper 3 also has a reservoir 25, which serves as a compensation space for the pressure medium displaced by the piston rod 21. The compensation space 25 is radially defined by the cylinder 19 and an outer container tube 27. The piston rod guide 29 and the bottom 31 enclose the axial ends of the compensation space 25, which also contains a gas volume 15 and a pressure medium volume 13. An axially movable annular separation piston causes spatial separation of the gas and pressure medium. In principle, the structural design of the damper 3 conforms to the application of this invention.

[0024] A hydraulic connection line 35 exists between the pump assembly 1 and the damper 3, which allows for the generation of a larger or smaller thrust force on the piston rod by supplying or drawing a pressure medium to or from the damper 3 via the pump assembly 1.

[0025] also, Figure 2 The encapsulation 17 is shown to have a filling connection 37 that passes through the wall of the memory housing 11. At least one filling connection 37 of the encapsulation 17 and a filling connection 39 for a pressure medium are preferably arranged in a common surface area of ​​the memory housing 11. A preferred location for the filling connection is the axial covering surface 41, because it is at least partially implemented as a plane, and hydraulic sealing can be readily achieved accordingly.

[0026] The filling connection 37 for the filler 17 has a closure 43, preferably made of plastic, which can also be implemented as a fusible part in terms of temperature characteristics. At a correspondingly high temperature, the closure 43 melts, the gas volume 15 can escape, and the reservoir 9 at this time loses its pressure preload. Therefore, there is no available pressure pad to force the pressure medium out of the reservoir 9, for example, in the event of an accident and thus damage to the reservoir 9, and the pressure medium may be ejected from the reservoir 9. The pressure medium in the liquid phase poses almost no risk of combustion. The same medium as an oil cloud would be more easily ignited.

[0027] Figure 3The pump assembly 1 shown is much simpler than a memory with a separate piston that can move axially, due to the use of the encapsulation 17. At least two memories 9A, 9B can be stacked axially, and their contact surfaces 45, 47 facing each other have an axial hydraulic connection 49 between the at least two memories 9A. The two memories 9A, 9B can be filled by filling the connection 37, 39. With conventional memories, external connection lines must be used to bridge the gas space.

[0028] Figure 4 An alternative variant of pump assembly 1 is shown, in which at least two reservoirs 9A, 9B are arranged concentrically with each other. In this case, the outer peripheral surface 51 of the reservoir housing 53 of the inner reservoir 9A and the inner peripheral surface 55 of the outer reservoir housing 57 form the second reservoir 9B. Simple tubular bodies with different diameters can be used to form partition walls between the reservoirs 9A, 9B. This configuration is not feasible for reservoirs with suspended separation pistons because the cylinder is sized according to either the inner or outer diameter, and only the sized diameter is suitable as a guide for the separation piston. For example, a radial connecting portion 49 may exist between the two reservoirs 9A, 9B.

[0029] List of reference numerals

[0030] 1. Pump assembly

[0031] 3. Vibration dampers

[0032] 5 pumps

[0033] 7 Pump Driver

[0034] 9. Memory

[0035] 9A memory

[0036] 9B memory

[0037] 11. Memory casing

[0038] 13. Pressure medium volume

[0039] 15. Gas volume

[0040] 17 Encapsulation

[0041] 19-cylinder block

[0042] 21 Piston rod

[0043] 23 Pistons

[0044] 25. Memory

[0045] 27 Container tube

[0046] 29 Piston rod guide section

[0047] 31 Bottom

[0048] 33 Separating piston

[0049] 35. Connecting lines

[0050] 37 Fill the connecting part

[0051] 39 Filler joint

[0052] 41 Coverage

[0053] 43 Closed Body

[0054] 45 Contact surface

[0055] 47 Contact surface

[0056] 49 Connecting and coupling parts

[0057] 51 weeks

[0058] 53 Memory casing

[0059] 55 Weeks 57. Memory casing.

Claims

1. A pump assembly (1) comprising a pump (5) and a pump driver (7) and a ring memory (9; 9A; 9B) that at least partially surrounds the pump (5) and the pump driver (7), wherein, The memory (9; 9A; 9B) includes a hydraulic pressure medium volume (13) and a gas volume (15) spatially separated therefrom within a rigid memory housing (11), characterized in that the gas volume (15) is contained in a flexible encapsulation (17) isolated from the pressure medium volume (13) within the memory housing (11).

2. The pump assembly according to claim 1, characterized in that, The encapsulation body (17) has an arcuate shape that matches the cross-section of the memory housing (11) and is at least partially supported at the wall of the memory housing (11).

3. The pump assembly according to claim 1, characterized in that, Multiple encapsulations (17) are arranged in the memory (9; 9A; 9B).

4. The pump assembly according to claim 2, characterized in that, Multiple encapsulations (17) are arranged in the memory (9; 9A; 9B).

5. The pump assembly according to any one of claims 1 to 4, characterized in that, The encapsulation body (17) has a filling connection (39) that passes through the wall of the memory housing (11).

6. The pump assembly according to claim 5, characterized in that, At least one filling connection (37) of an encapsulation body (17) and a filling connection (39) for the pressure medium (13) are arranged in a common area (41) of the memory housing (11).

7. The pump assembly according to claim 5, characterized in that, The filling connection (37) has a fusible part (43).

8. The pump assembly according to any one of claims 1 to 4, characterized in that, At least two memory units (9A; 9B) are arranged stacked axially and their contact surfaces (45; 47) facing each other have a hydraulic connection (49) between the at least two memory units (9A; 9B).

9. The pump assembly according to any one of claims 1 to 4, characterized in that, At least two memories (9A; 9B) are arranged concentrically with each other, wherein the outer peripheral surface (51) of the memory housing (53) of the inner memory (9A) forms the inner peripheral surface of the outer memory housing (9B).

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