Hydraulic pump

Abstract

A hydraulic pump (10) has a housing (12), a pump module (26) and a stator module (38) both housed in the housing (12), and a housing cover (14) fluidly connected to the housing (12). The housing cover (14) has a partition wall (24) for hermetically sealing an interior (16) of the housing (12) having the pump module (26) and the stator module (38). In this case, the housing cover (14) also has an electronics unit which is arranged on the side of the partition wall (24) facing away from the interior (16) of the housing (12), a plurality of contacts (54) being provided which are guided from the interior (16) of the housing (12) through the partition wall (24) to the electronics unit in a fluid-tight manner. A sealing chamber (56) is provided for each contact (54), which sealing chamber is formed in the partition wall (24), which sealing chamber is open towards the stator module (38), and in which sealing chamber a sealing element (62) is arranged around the contact (54) extending through the sealing chamber (56).

Description

Technical Field

[0001] The present invention relates to a hydraulic pump having a housing, a pump module and a stator module housed within the housing, and a housing cover. Background Technology

[0002] Hydraulic pumps are configured for use in the transmission systems of motor vehicles. For example, a hydraulic pump can be used to provide a flow of hydraulic oil, which is converted into actuating force and actuating stroke in an actuator. In one example, the provided hydraulic oil flow is used to shift gears using a clutch. It can also be configured to provide a flow of cooling oil, by means of which components can be cooled or lubricated in the gearbox or clutch. Pumps can also be used to deliver other liquids, such as coolant for battery cooling, transmission oil, lubricating oil, cooling oil, engine oil, transformer oil, insulating oil, etc.

[0003] Such hydraulic pumps are known in various embodiments. They can be in the form of separate units, which are then connected to the component to be supplied via piping, or they can be directly mounted on another component, such as a transmission housing.

[0004] In the conventional construction of such hydraulic pumps, the housing is multi-piece, wherein, in most cases, one housing component is used for the pump module and another housing component is used for the stator module of the electric motor. Hydraulic pumps with a one-piece housing are also known.

[0005] In the automotive industry, there is a continuous effort to provide components that are as compact as possible and have the lowest manufacturing cost. Summary of the Invention

[0006] Therefore, the object of the present invention is to provide a hydraulic pump having a compact construction and being easy to assemble.

[0007] This objective is achieved by a hydraulic pump having a housing, a pump module and a stator module both housed within the housing, and a housing cover fluidly and resoundingly connected to the housing. The housing cover has partition walls for hermetically sealing the interior of the housing containing the pump module and stator module. The housing cover also has an electronic unit for controlling the hydraulic pump, arranged on the side of the partition wall facing away from the interior of the housing. In this case, multiple contacts are provided, which are fluidly guided from the interior of the housing through the partition walls to the electronic unit. Each contact is provided with a sealing chamber formed in the partition wall, opening towards the stator module, and a sealing element is arranged within this chamber surrounding the contact extending through the chamber. In this manner, the hydraulic pump can be particularly compact, especially in the axial direction, and can be designed with few components, thus enabling quick and reliable assembly.

[0008] Specifically, the hydraulic pump is designed without a separator tank that extends between the stator and rotor of the hydraulic pump's electric motor, separating the hydraulic oil side of the hydraulic pump from the electronics side. In the context of this invention, the separator ensures that hydraulic oil does not escape from the hydraulic pump to the electronics side.

[0009] In one embodiment, the length of the sealing chamber's cross-section is at least twice its radial width, thus allowing at least two contact elements to be guided through the common sealing chamber while being adjacent in the circumferential direction. This reduces the number of sealing chambers and sealing elements, thereby simplifying the construction and assembly of the hydraulic pump.

[0010] In another embodiment, the stator module has protrusions for each of the sealing chambers, particularly protrusions that axially define the corresponding sealing element. This ensures that the sealing elements are arranged in a defined manner within the sealing chambers, and that the sealing chambers are effectively closed or sealed by the sealing elements.

[0011] In this case, the contacts can be insulated displacement contacts, which further simplifies assembly.

[0012] Specifically, the insulating displacement contact is designed such that it has an insulating displacement element at one end and a portion for press-fit at the opposite end.

[0013] The stator module protrusions may also be provided with guide slots for the stator winding cables to ensure that the cables are connected to the contacts for signal transmission during assembly.

[0014] Alternatively or additionally, the sealing element may have at least two peripherally extending ribs on its outer surface in order to provide a reliable sealing effect.

[0015] According to one embodiment, the housing cover accommodates a circuit board on which components of the electronic unit are mounted. In this way, the electronic unit can be manufactured and installed effortlessly.

[0016] In this case, the partition wall can be provided with a stop structure for axially positioning the circuit board, so that the circuit board can be arranged relative to the partition wall in a defined manner without effort.

[0017] In another embodiment, the stop structure is further formed by an extension arranged opposite the sealing chamber in the axial direction. Thus, the circuit board is axially supported by the extension in the area where the contacts are guided through the partition wall.

[0018] Furthermore, the circuit board can be embedded in a potting compound to protect or insulate components of the electronic unit, particularly those that provide electrical and / or mechanical protection or insulation. Additionally, the potting compound has good thermal conductivity, allowing waste heat generated to be effectively dissipated from the electronic unit.

[0019] In one embodiment, the housing cover has a radially extending plug connector, thereby making the hydraulic pump particularly compact in the axial direction.

[0020] In another embodiment, the pump module is a rotor pump or a rotary vane pump, which is particularly compact and reliable. Attached Figure Description

[0021] Further advantages and features will become apparent from the following description and accompanying drawings, wherein:

[0022] Figure 1 A cross-sectional view of a hydraulic pump according to the invention is shown, the pump having a housing cover and a circuit board housed within the housing cover, wherein the potting compound surrounding the circuit board is not shown.

[0023] Figure 2 It shows Figure 1 Another cross-sectional view of the hydraulic pump shows the potting compound surrounding the circuit board.

[0024] Figure 3 Showing from Figure 1 A perspective view of the electrical contacts of a hydraulic pump.

[0025] Figure 4 Showing from Figure 1 A partial cross-sectional view of a portion of a hydraulic pump, showing in detail the guidance of electrical contacts through the partition wall, and...

[0026] Figure 5 A cross-sectional view of a hydraulic pump according to another embodiment of the invention is shown. Detailed Implementation

[0027] Figure 1 A hydraulic pump 10 is shown, designed to provide a flow of hydraulic oil to the transmission system of a motor vehicle. This flow can be used to lubricate or cool transmission system components. The flow of hydraulic oil can also be configured to be converted into an actuation stroke in an actuator, for example, to switch a clutch.

[0028] The hydraulic pump 10 has a housing 12 and a housing cover 14, which enclose the interior 16.

[0029] The shell 12 is a single piece and has a cup shape, namely a bottom 18 and a side wall 20. The side wall 20 is in the shape of a hollow cylinder and extends from the bottom 18 to the edge 22 of the shell in the opposite axial direction A.

[0030] The housing cover 14 has a partition wall 24 that extends radially over substantially the entire interior 16.

[0031] In this embodiment, the housing 12 and the housing cover 14 are injection-molded parts made of plastic, such as thermoplastic. Particularly suitable materials are PPA or PPS.

[0032] The hydraulic pump 10 also has a pump module 26 and an electric motor 28, which are arranged in the interior 16.

[0033] Pump module 26 has a pump housing 30 and a pump rotor 32 housed within the pump housing. In the embodiment of the hydraulic pump 10 shown here, an outer ring 34 is also present, which is rotatably housed within the pump housing 30.

[0034] Pump module 26 here is a rotor pump (gerotor type) pump.

[0035] The electric motor 28 has a rotor 36 and a stator module 38 with a stator 40. The stator 40 is fixedly arranged in the housing 12, and the rotor 36 is connected to a shaft 42 for common rotation, the shaft being mounted in the pump housing 30 about a rotation axis R for rotation.

[0036] The pump rotor 32 is mounted on one end of the shaft 42 in a manner that they rotate together, and the end is located inside the pump housing 30, for example by means of a press fit.

[0037] The dimensions of the pump housing 30 allow the pump rotor 32 to be accommodated within it with the necessary axial clearance.

[0038] In order to control the electric motor 28, the hydraulic pump 10 has a circuit board 44 on which components 46 for the electronic unit for controlling the hydraulic pump 10 are arranged.

[0039] The circuit board 44 is housed in the housing cover 14 and is seated on the partition wall 24 by a stop structure 48, which is formed on the partition wall 24 by an extension 50 on the side of the partition wall 24 opposite to the interior 16 and is designed to axially position the circuit board 44.

[0040] In this embodiment, the circuit board 44 is embedded in the potting compound 52 (see Figure 2 ).

[0041] It should be pointed out here that, Figure 1 In the diagram, the hydraulic pump 10 is shown without the infusion compound 52, so as to better illustrate the structure, particularly the component 46 of the electronic unit.

[0042] In an alternative embodiment, the circuit board 44 may be partially surrounded by the potting compound 52.

[0043] The electric motor 28 is powered by an electrical contact 54 (see...) Figure 3 It is connected to the circuit board 44 for signal transmission, and the electrical contact 54 extends axially through the partition wall 24.

[0044] Electrical contacts 54 each extend through the sealed chamber 56 (see Figure 4 The sealed chamber 56 is formed in the partition wall 24 and opens to the interior 16. This means that a gap 60 is formed between the electrical contact 54 and the chamber wall 58 that radially defines the sealed chamber 56, which opens to the interior 16.

[0045] In this case, the extension 50 forming the stop structure 48 extends into the chamber wall 58 of the sealing chamber 56 in the axial extension. This means that, relative to the axial direction A, the extension 50 is arranged opposite to the sealing chambers 56 and their chamber walls 58.

[0046] In a cross-section perpendicular to the axial direction A, the sealing chamber 56 has a radial width B and a tangential length L (see...). Figure 3 The tangential length L is at least 200% of the radial width B.

[0047] In order to seal the gap 60 or the sealing chamber 56 in a fluid-tight manner, a sealing element 62 is arranged in each sealing chamber 56, which surrounds an electrical contact 54 extending through the respective sealing chamber 56.

[0048] Each sealing element 62 has two peripherally extending ribs 64, which are arranged one after another on the outer surface 66 of the sealing element 62 in the axial direction A.

[0049] In an alternative embodiment, the sealing element 62 may each have any number of peripherally extending ribs 64, particularly one or three.

[0050] The dimensions of the sealing element 62 and the sealing chamber 56 are designed such that the sealing element 62 is radially compressed within the sealing chamber 56 to ensure a good sealing effect.

[0051] In this case, the stator module 38 has a stator housing 68 with protrusions 70 associated with a sealing chamber 56 and each protrusion 70 protruding axially into the sealing chamber 56, such that the sealing element 62 is axially defined by the protrusions 70 in the sealing chamber 56.

[0052] In an alternative embodiment, the sealing element 62 is not defined by the protrusion 70 in the sealing chamber 56, or at least not axially defined by the protrusion 70 in the sealing chamber 56.

[0053] The protrusion 70 has a guide groove 72 in which the cable 74 of the stator winding of the stator 40 is received, and in particular clamped in the guide groove 72.

[0054] In this embodiment, the electrical contacts 54 are insulating displacement contacts having insulating displacement elements at their ends facing the stator 40.

[0055] The protrusion 70 is designed such that the electrical contact 54 can be inserted into the protrusion 70 in the axial direction A, wherein the electrical contact 54 is automatically connected to the cable 74 in the guide groove 72 for signal transmission.

[0056] In this case, the electrical contact 54 is connected to the circuit board 44 via a press-fit connection for signal transmission.

[0057] Alternatively, electrical contact 54 may be connected to circuit board 44 by soldering for signal transmission.

[0058] The circuit board 44 is also connected to the terminal contacts of the electrical terminals 76 of the hydraulic pump 10 for signal transmission.

[0059] Electrical terminal 76 is here a plug connector 78, which extends radially, i.e., perpendicular to the axial direction A, and is part of housing cover 14.

[0060] In addition, the interior 16 includes a pump housing space 80 and a stator housing space 82, with the pump module 26 arranged in the pump housing space 80 and the stator module 38 arranged in the stator housing space 82.

[0061] The pump housing 80 and the stator housing 82 are directly adjacent to each other, meaning they are not separated by partition walls and are therefore axially open.

[0062] Pump module 26 abuts against the bottom 18 of housing 12 in the axial direction A and is arranged in pump housing space 80 such that pump module 26 is connected in flow to suction opening 84 and pressure opening 86 of hydraulic pump 10, which extend through the bottom 18 in the axial direction A.

[0063] The pump module 26 is at least partially complementary to the housing 12, such that the pump module 26 is received substantially without clearance in the pump housing module 80 in the radial direction.

[0064] The housing 12 also has a fastening pin 88 (see Figure 2 Pump module 26 is placed on fastening pin 88 along axial direction A, and the end 90 of fastening pin 88 forms a plastically deformed axial retaining protrusion 92, which axially fastens pump module 26 to housing 12.

[0065] Alternatively or additionally, the pump module 26 can be axially fastened to the housing 12 by welding, in particular laser welding, the pump housing 30 to the sidewall 20.

[0066] The stator module 38 is arranged adjacent to the pump module 26 and is at least partially complementary to the housing 12, such that the stator module 38 is received substantially without gaps in the stator housing module 82 in the radial direction.

[0067] In one embodiment, the stator module 38 directly abuts against the pump module 26 in the axial direction A.

[0068] The stator module 38 is also fixed to the housing 12 in such a way that the stator housing 68 of the stator module 38 is radially and peripherally welded to the side wall 20, in particular by laser welding.

[0069] The housing cover 14 has a support portion 94 by means of which the housing cover 14 abuts against the stator module 38 in the axial direction A.

[0070] The housing cover 14 also has a flange 96 that extends radially and preferably in the axial direction A over the housing edge 22.

[0071] Flange 96 is spaced apart from housing edge 22 in the axial direction A.

[0072] In this way, the flange 96 protects the edge 22 of the housing and together with it forms a labyrinth seal.

[0073] The housing cover 14 also has a skirt 98 that extends in the axial direction A and is complementary to the housing edge 22. By means of the skirt 98, the housing cover 14 radially abuts the inside of the housing edge 22 over its entire circumference.

[0074] In the current embodiment, the housing cover 14 is welded radially and peripherally to the housing edge 22, particularly by means of the skirt 98, such that the weld is fluid-tight and preferably airtight.

[0075] Welding can be accomplished using laser welding.

[0076] In this manner, the interior 16 is airtightly sealed by the partition wall 24 or the housing cover 14 in conjunction with the sealing element 62.

[0077] In another embodiment, the housing cover 14 may have a protective cap that covers the housing cover 14, such that the circuit board 44 is enclosed within the housing cover 14 between the protective cap and the partition wall 24. The protective cap is particularly provided in embodiments where the circuit board 44 is not embedded, or not fully embedded, in the potting compound 52.

[0078] To assemble the hydraulic pump 10, the shaft 42 with rotor 36 is first inserted into the pump module 26 without clearance in the axial direction A.

[0079] Then, the pump rotor 32 is pressed onto the shaft 42, and then the outer ring 34 is installed.

[0080] Then the pump module 26 is inserted into the housing 12 along the axial direction A and secured in the pump housing space 80.

[0081] For this purpose, the pump module 26 is placed on the fastening pin 88 in the axial direction A, and the end 90 is plastically deformed to form an axially retaining protrusion 92, for example by ultrasonic welding.

[0082] Alternatively or additionally, the pump housing 30 may be welded to the sidewall 20 in order to secure the pump module 26 to the housing 12.

[0083] In a further step, the electrical contact 54 is inserted into the protrusion 70 of the stator module 38 in the axial direction A and connected to the cable 74 in the guide slot 72 for signal transmission.

[0084] The sealing element 62 is placed on the electrical contact 54 beforehand or subsequently, and thus attached to the stator module 38 via the electrical contact 54.

[0085] Subsequently, the stator module 38 is inserted into the housing 12 along the axial direction A and secured adjacent to the pump module 26 in the stator receiving space 82.

[0086] Then, the partition wall 24 is inserted into the housing 12 in the axial direction A, such that the sealing element 62 is arranged in the sealing chamber 56, and the electrical contact 54 is guided through the sealing chamber 56.

[0087] The protrusion 70 defines the sealing element 62 in the sealing chamber 56 in the axial direction A.

[0088] With the aid of the support portion 94, the partition wall 24 is axially abutted against the stator module 38, thereby ensuring that the protrusion 70 axially protrudes into the sealing chamber 56 in a defined manner and defines the sealing element 62.

[0089] Subsequently, the housing cover 14 is fluid-tightly welded to the housing edge 22.

[0090] Thus, the interior 16 is fluid-tightly sealed by the partition wall 24 and the sealing element 62.

[0091] In a further step, the circuit board 44 is inserted into the housing cover 14 in the axial direction A and arranged to contact the partition wall 24 axially via the stop structure 48.

[0092] The circuit board 44 is axially placed on the electrical contact 54 and connected to the electrical contact in this manner for signal transmission.

[0093] Alternatively, electrical contact 54 may be brazed to circuit board 44.

[0094] Subsequently, the circuit board 44 was encapsulated in the housing cover 14 using potting compound 52.

[0095] In an alternative embodiment, after the stator module 38 has been inserted, the electrical contact 54 is inserted into the protrusion 70 and connected to the cable 74 for signal transmission.

[0096] In another alternative embodiment where the electrical contact 54 is an insulated displacement contact, the electrical contact 54 is secured to the partition wall 24 by a sealing element 62 and inserted together with the partition wall, wherein when the electrical contact is inserted into the protrusion 70, the electrical contact 54 automatically connects to the cable 74 in the guide groove 72 for signal transmission.

[0097] Alternatively or additionally, the circuit board 44 may even be attached to the housing cover before being inserted into the housing cover 14.

[0098] In an alternative embodiment, the individual parts or components may not be fastened immediately after insertion, but at a later time.

[0099] For example, in one embodiment, the pump module 26, stator module 38 and / or housing cover 14 are welded to housing 12 after all parts or components have been inserted into housing 12.

[0100] exist Figure 5 The image shows a hydraulic pump 10 according to another embodiment. Components known from previous embodiments are referred to using the same reference numerals, and in this regard, reference is made to the above description.

[0101] In this embodiment, pump module 26 is a rotary vane type pump and is designed accordingly.

[0102] In this way, a hydraulic pump 10 that can be assembled particularly easily is provided, since all internal parts or components are inserted into the housing 12 from one side, i.e., in the axial direction A, and assembly is performed without screws.

[0103] Because the parts or components are fastened in the housing 12 without screws, the hydraulic pump 10 is also particularly compact, especially in the radial direction, because the space-consuming fastening flanges used for such screw connections are eliminated.

[0104] This invention is not limited to the embodiments shown. In particular, features of one embodiment can be combined with features of other embodiments as needed, especially other features independent of the corresponding embodiments.

Claims

1. A hydraulic pump (10) having a housing (12), a pump module (26) and a stator module (38) both housed in the housing (12), and a housing cover (14) fluid-tightly connected to the housing (12), wherein, The housing cover (14) has a partition wall (24) for sealing the interior (16) of the housing (12) with the pump module (26) and the stator module (38). The housing cover (14) also has an electronic unit arranged on the side of the partition wall (24) opposite to the interior (16) of the housing (12). A plurality of contacts (54) are provided, which are guided in a liquid-tight manner from the interior (16) of the housing (12) through the partition wall (24) to the electronic unit. Each contact (54) is provided with a sealing chamber (56) formed in the partition wall (24) and open toward the stator module (38). A sealing element (62) is arranged in the sealing chamber (56) to surround the contact (54) extending through the sealing chamber (56).

2. The hydraulic pump (10) according to claim 1, characterized in that, The length (L) of the cross-section of the sealed chamber (56) is at least twice its width (B).

3. The hydraulic pump (10) according to claim 1 or 2, characterized in that, The stator module (38) has a protrusion (70) for each of the sealing chambers (56).

4. The hydraulic pump (10) according to claim 3, characterized in that, The contact (54) is an insulating displacement contact.

5. The hydraulic pump (10) according to any one of claims 3 and 4, characterized in that, The protrusion (70) of the stator module (38) is provided with a guide groove (72) for the cable (74) of the stator winding.

6. The hydraulic pump (10) according to any one of the preceding claims, characterized in that, The sealing element (62) has at least two peripherally extending ribs (64) on its outer surface (66).

7. The hydraulic pump (10) according to any one of the preceding claims, characterized in that, The housing cover (14) houses the circuit board (44), on which the components (46) of the electronic unit are mounted.

8. The hydraulic pump (10) according to claim 7, characterized in that, The partition wall (24) is provided with a stop structure (48) for axially positioning the circuit board (44).

9. The hydraulic pump (10) according to claim 8, characterized in that, The stop structure (48) is formed by an extension (50) which is arranged opposite to the sealing chamber (56) relative to the axial direction (A).

10. The hydraulic pump (10) according to any one of claims 7 to 9, characterized in that, The circuit board (44) is embedded in the potting compound (52).

11. The hydraulic pump (10) according to any one of the preceding claims, characterized in that, The housing cover (14) has a radially extending plug connector (78).

12. The hydraulic pump (10) according to any one of the preceding claims, characterized in that, The pump module (26) is a rotor pump or a rotary vane pump.

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