Hydraulic pump

Abstract

The hydraulic pump (10) has a motor housing (14) and a stator module (32) arranged within the motor housing (14). The stator module (32) has a support (34) which is housed in a holding portion (40) of the motor housing (14). In this case, the holding portion (40) comprises a first wall portion (42) having a first wall thickness (D) and a second wall portion (44) having a second wall thickness (d), where the second wall thickness (d) is less than the first wall thickness (D). Here, the second wall portion (44) is materially connected to a support (34) of the stator module (32) by a welded joint (54).

Description

Technical Field

[0001] The present invention relates to a hydraulic pump, which includes a motor housing and a stator module arranged within the motor housing. Background Art

[0002] Hydraulic pumps of this type are known.

[0003] Due to the compact construction of traditional hydraulic pumps, the motor housing has only very limited installation space for the stator module.

[0004] One challenge of known hydraulic pumps is to fix the stator module in the motor housing without play to ensure the reliable operation of the hydraulic pump. So far, for this purpose, hydraulic pumps require complex construction and laborious assembly. Summary of the Invention

[0005] The object of the present invention is to provide a hydraulic pump in which the stator module is fixed in the housing with little effort.

[0006] This object is achieved by a hydraulic pump, which includes a motor housing and a stator module arranged within the motor housing. The stator module has a support member, which is received in a holding portion of the motor housing. In this case, the holding portion includes a first wall portion having a first wall thickness and a second wall portion having a second wall thickness, wherein the second wall thickness is less than the first wall thickness. In addition, the second wall portion is materially connected to the support member of the stator module by a welding joint.

[0007] According to the present invention, it has been recognized that the support member can be welded with little effort and thus reliably connected to the holding portion via the second wall portion having a reduced wall thickness relative to the first wall portion. In particular, the welding can be performed radially from the outside through or by means of the second wall portion, so that no open channel leading to the stator module is required to fix the stator module in the motor housing.

[0008] In particular, the second wall portion forms a weakened area in the housing wall of the motor housing, while the first wall portion corresponds to a conventional housing wall. In other words, the first wall portion does not merely form a particularly reinforced wall portion of the motor housing, such as a wall portion with ribs or studs, which are usually provided only in relatively limited areas on the motor housing.

[0009] In one embodiment, the second wall portion is formed of a laser-transparent plastic. In particular, in this case, the second wall portion is laser-welded to the support member. In this way, the motor housing can be welded to the stator module radially from the outside in a particularly efficient manner.

[0010] Here, the second wall thickness can be at most 2 mm, so that the heat input during the welding process quickly reaches the depth ensuring an effective weld joint between the holding part and the support. If the weld joint is formed by a laser welding method, in the case of this wall thickness, the second wall part is thin enough so that a large enough proportion of the laser power passes through the second wall part to ensure an effective weld joint.

[0011] Additionally or as an alternative, the first wall thickness can be at least 3.6 mm, thereby ensuring that the motor housing has a sufficiently high structural strength and thus providing a high protection effect.

[0012] In another embodiment, the holding part has at least four first wall parts and at least four second wall parts. Thus, the holding part is welded to the stator module at multiple positions, thereby being connected in a particularly reliable manner.

[0013] Furthermore, it can be provided that the first wall parts and the second wall parts are arranged on a common circumference or a circumferential line. In other words, the first wall parts and the second wall parts are arranged in series in the circumferential direction. In this way, the second wall parts (at which the motor housing is weakened and materially connected to the support) are distributed on the outer circumference of the holding part, so that the motor housing and the hydraulic pump as a whole can be configured in a particularly stable manner.

[0014] Additionally or as an alternative, adjacent second wall parts can each be separated from each other in the circumferential direction by at least one first wall part to ensure that the motor housing still has a particularly high strength despite the relatively thin second wall parts.

[0015] According to one embodiment, the second wall parts each extend at least 5 mm, particularly at least 10 mm, in the circumferential direction. Thus, the second wall parts are wide enough to enable an effective weld joint to be manufactured with little effort.

[0016] According to another embodiment, the second wall parts are welded to the axial end of the support facing the pump module of the hydraulic pump. In this way, after the stator module is arranged in the motor housing, the motor housing is welded to the stator module at a position that is usually no longer accessible. Therefore, there are fewer requirements for the configuration of the hydraulic pump, enabling it to have a less complex structure.

[0017] Furthermore, at least some of the first wall parts can be arranged at the same angular position as the connection part of the pump housing of the hydraulic pump, where the pump module of the hydraulic pump is fixed. This has the advantage that the relatively thicker first wall parts are aligned with the connection part in the axial direction, and the connection part has a particularly stable configuration like the first wall parts. The hydraulic pump can thus have a particularly high strength.

[0018] Furthermore, it can be provided that the motor housing is integrally formed with the pump housing of the hydraulic pump, and the pump module of the hydraulic pump is received in the pump housing. This enables the hydraulic pump to be composed of a particularly small number of individual components and thus configured in a particularly efficient manner. Description of the Drawings

[0019] From the following description and the drawings, further advantages and features will become apparent. In the said drawings:

[0020] Figure 1 An axial sectional view of a hydraulic pump according to the invention is shown, which hydraulic pump comprises a stator module and a pump module.

[0021] Figure 2 A sectional view of the hydraulic pump along Figure 1 the plane A - A in

[0022] Figure 3 is shown, in which the stator windings of the stator module are not shown. Figure 1

[0023] Figure 4 A sectional view of the hydraulic pump along Figure 1 the plane B - B in is shown, in which the pump module is not shown. Detailed Description of the Embodiments

[0024] The following detailed description in conjunction with the drawings is intended as a description of various embodiments of the disclosed subject matter and does not represent individual embodiments. In the drawings, the same numerals represent the same elements. Each embodiment described in the present disclosure is purely used as an example or illustration and should not be construed as being preferred or advantageous over other embodiments.

[0025] All features disclosed below with reference to the exemplary embodiments and / or the drawings can be combined individually or in any desired sub - combination with the features of the aspects of the present disclosure, including the features of the preferred embodiments, as long as the final combination of features is valuable to those skilled in the art.

[0026] Figure 1 A hydraulic pump 10 is shown, in which, for the sake of clarity, only the key parts of the invention are illustrated. In particular, the illustration of the rotor of the electric motor 18 and the electronic device for controlling the hydraulic pump 10 is omitted.

[0027] The hydraulic pump 10 is configured to provide, for example, a hydraulic oil flow for the driveline of a motor vehicle. The said hydraulic oil flow can be used to lubricate or cool the components of the driveline. The hydraulic oil flow can also be provided for conversion into an actuation stroke in an actuator, for example in order to shift a clutch.

[0028] The hydraulic pump 10 has a housing 12, which has a motor housing 14 and a pump housing 20. An electric motor 18 (only partially shown) is arranged in the interior 16 of the motor housing 14, and a pump module 24 is received in the interior 22 of the pump housing 20.

[0029] Here, the housing 12 has a one-piece construction and has a pot shape, i.e., a bottom 26 and a side wall 28. The side wall 28 extends substantially in the shape of a hollow cylinder in the axial direction Z from the bottom 26 to the housing edge 30.

[0030] In an alternative embodiment, the housing 12 consists of a plurality of individual components.

[0031] In addition to the rotor (not shown), the electric motor 18 has a stator module 32, which has a support 34 and a stator winding 36.

[0032] The support 34 is made of plastic and forms a trough-shaped insulator here, on which the stator winding 36 is mounted.

[0033] In this case, the stator module 32 is arranged in a fixed manner in the housing 12, and the rotor is drivingly connected to the pump module 24 via a shaft (not shown), in particular to the pump rotor of the pump module 24.

[0034] At the end 38 of the support 34 facing the pump module 24, the support 34 is fixed to the holding part 40 of the motor housing 14.

[0035] The holding part 40 extends around the support 34 in a circumferential U in an annular or closed form (see Figure 2 ), and radially adjoins the support 34 in the extending area on the inner side.

[0036] In the embodiment under consideration, the holding part 40 has nine first wall parts 42 and nine second wall parts 44, which are arranged in series alternately in the circumferential U on the common circumference 46 of the holding part 40.

[0037] In an alternative embodiment, the holding part 40 can have any desired number of first wall parts 42 and any desired number of second wall parts 44, but preferably has at least four first wall parts 42 and at least four second wall parts 44.

[0038] In addition or as an alternative, the first wall parts 42 and the second wall parts 44 can be arranged in any desired order in the circumferential U. However, in particular, in each case, at least one first wall part 42 is arranged between two mutually adjacent second wall parts 44.

[0039] The first wall part 42 has a first wall thickness D of 4 mm (see Figure 3) while the second wall portion 44 has a second wall thickness d of 1.8 mm.

[0040] In general, the first wall thickness D and the second wall thickness d can each be of any size.

[0041] The first wall thickness D is preferably at least 3.6 mm, while the second wall thickness d is at most 2 mm.

[0042] In all embodiments, the first wall thickness D is greater than the second wall thickness d.

[0043] The width u of the second wall portion 44 in the circumferential direction U is 30 mm, and the height h in the axial direction Z (see Figure 1 ) is 20 mm.

[0044] In an alternative embodiment, the second wall portions 44 can each have any desired width u and any desired height h.

[0045] Preferably, the width u is at least 5 mm, particularly at least 10 mm.

[0046] Furthermore, the height h is preferably at least 5 mm, particularly at least 10 mm.

[0047] In the embodiments considered, six of the nine first wall portions 42 are arranged in the circumferential direction U at the same angular position as the connection portion 48 (see Figure 4 ) of the pump housing 20, through which the pump module 24 is mounted on the pump housing 20.

[0048] This means that each connection portion 48 is assigned a first wall portion 42 at the same angular position as the corresponding connection portion 48.

[0049] In an alternative embodiment, of course, any desired section of the first wall portion 42 can be arranged at the angular position of the connection portion 48.

[0050] Here, the connection portions 48 each have a cylindrical retaining pin 50 that extends in the axial direction Z and terminates in a mushroom-shaped retaining projection 52.

[0051] By means of the retaining projection 52, the pump module 24 is fixed in the interior 22 of the pump housing 20 in the axial direction Z.

[0052] In principle, each connection portion 48 can be configured as required.

[0053] In all embodiments, the support 34 is in each case materially connected to the second wall portion 44 by a weld joint 54.

[0054] In particular, the support 34 is laser welded to the second wall portion 44.

[0055] For this purpose, the housing 12 is formed of a laser-transparent plastic having a glass fiber content of at least 40%, particularly in the second wall portion 44.

[0056] The housing 12 is, for example, an injection-molded part.

[0057] In principle, the housing 12 can be formed of any desired material, provided that the motor housing 14 or at least the second wall portion 44 is formed of a laser-transparent plastic that ensures the effective formation of the weld joint 54.

[0058] In the embodiment under consideration, the first wall portion 42 is not connected to the support 34 by the weld joint 54.

[0059] In particular, the motor housing 14 is materially connected to the support 34 only via the second wall portion 44 and not via the first wall portion 42.

[0060] To assemble the hydraulic pump 10, the pump module 24 is first inserted axially into the pump housing 20 in the axial direction Z and fixed in the interior 22 by the connecting portion 48.

[0061] For this purpose, after the pump module 24 is inserted, the retaining pin 50 is plastically deformed to form the retaining projection 52.

[0062] The stator module 32 is then inserted axially into the interior 16 of the motor housing 14 in the axial direction Z.

[0063] In a subsequent step, the stator module 32 is fixed to the motor housing 14 by radially welding (particularly spot welding) the retaining portion 40 to the support 34 from the outside by means of a laser through the second wall portion 44. This means that during the welding process, the laser passes through the corresponding second wall portion 44 from the outside and enters that part of the support 34 which is arranged radially inside and adjacent to the corresponding second wall portion 44.

[0064] The formation of the weld joint 54 does not have to occur immediately after the stator module 32 is inserted, but can occur at any subsequent time point.

[0065] In one embodiment, for example, the stator module 32 is welded to the motor housing 14 only after all components or assemblies have been inserted into the housing 12, particularly after the housing 12 has been closed with a cover.

[0066] In this way, a hydraulic pump 10 that can be manufactured at low cost is provided.

[0067] In this case, the stator module 32 is fixed quickly and reliably in the interior 16 of the motor housing 14, in particular at the end 38 of the support 34 facing the pump module 24.

Claims

1. A hydraulic pump (10), comprising a motor housing (14) and a stator module (32), wherein the stator module (32) is arranged in the motor housing (14), wherein: The stator module (32) has a support member (34), which is accommodated in a retaining portion (40) of the motor housing (14), characterized in that the retaining portion (40) includes a first wall portion (42) having a first wall thickness (D) and a second wall portion (44) having a second wall thickness (d), wherein the second wall thickness (d) is smaller than the first wall thickness (D), and wherein the second wall portion (44) is materially connected to the support member (34) of the stator module (32) via a welded joint (54).

2. The hydraulic pump (10) according to claim 1, characterized in that: The second wall portion (44) is formed from a laser transparent plastic, in particular, wherein the second wall portion (44) is laser welded to the support (34).

3. The hydraulic pump (10) according to claim 1 or 2, characterized in that: The second wall thickness (d) is at most 2 mm, in particular, wherein the first wall thickness (D) is at least 3.6 mm.

4. A hydraulic pump (10) according to any one of the preceding claims, characterised in that The holding portion (40) has at least four first wall portions (42) and at least four second wall portions (44).

5. A hydraulic pump (10) according to any one of the preceding claims, characterised in that The first wall portion (42) and the second wall portion (44) are arranged on a common circumference (46).

6. A hydraulic pump (10) according to any one of the preceding claims, characterised in that The second wall portions (44) adjacent to each other are each separated from each other in the circumferential direction (U) by at least one first wall portion (42).

7. A hydraulic pump (10) according to any one of the preceding claims, characterised in that The second wall parts (44) each extend in the circumferential direction (U) by at least 5 mm, in particular at least 10 mm.

8. A hydraulic pump (10) according to any one of the preceding claims, characterised in that The second wall portion (44) is welded to an axial end (38) of the support (34), the axial end facing the pump module (24) of the hydraulic pump (10).

9. A hydraulic pump (10) according to any one of the preceding claims, characterised in that At least some of the first wall portions (42) are arranged at the same angular position as a connecting portion (48) of a pump housing (20) of the hydraulic pump (10) to which a pump module (24) of the hydraulic pump (10) is fixed.

10. A hydraulic pump (10) according to any one of the preceding claims, characterised in that The motor housing (14) is formed in one piece with a pump housing (20) of the hydraulic pump (10), in which a pump module (24) of the hydraulic pump (10) is accommodated.

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