JP2023536941A - Assembled structure for electric oil pump - Google Patents

Abstract

Assembly structure (M) for an electric oil pump, comprising a stator, at least one rotor and upper and lower pump pressure plates (6); an electric motor unit (2) which is arranged axially against the oil pump (1) and includes an electric motor (3) for rotating the oil pump (1); A pump casing (4) for accommodating the oil pump (1) and the electric motor (3), a base plate (5) for sealing, orienting and positioning the oil pump (1) and the electric motor (3) within the pump casing (4), a base plate formed as a lower pump pressure plate (6) with a suction line (6.1) and a discharge line (6.2) for the electric motor (3) and the oil pump (1); a circuit support (7) with a control unit for controlling and a cover (8) for sealing at least the circuit support (7) towards the base plate (5) or the lower pump pressure plate (6); The suction pipe (6.1) and the discharge pipe (6.2) of the base plate are arranged parallel to the axis (A) of the oil pump (1) and the electric motor (3). an assembled structure (M), which is guided through corresponding openings (8.1) in the cover (8) and through corresponding openings (7.1) in the circuit support (7).

Description

PRIOR ART Existing electric oil pumps with axial arrangement of lower components:
Option 1:
The electric motor, pump and control electronics are all oriented along the same axis and the hydraulic lines are usually located towards the side of the assembly of the package, i.e. radially, or Option 2 :
The electronics, motors, and pumps are all oriented along the same axis, and the hydraulic lines are located near, alongside, the pump (radially, axially, or a mixture of these, e.g., the inlet radial, axial exit).

Problems The casing of the entire assembled structure is usually made up of several parts to accommodate the components. Typically, each major component, such as the motor and pump, is incorporated within a separate casing, each inside its own casing, which increases size and cost. ing.

Depending on the control electronics (circuit support, e.g. PCB or printed circuit board) and the size of the motor, it is not possible to assemble the electric pump from only one side, i.e. the integration of the components into one common casing. Mounting cannot be done from one co-located side, eg "from top to bottom".

For Option 2, limitations typically arise with regard to packaging, and the radial size of the electronics, often larger than the motor diameter, creates "dead space" within the installation space, thereby , conduits and cables are prevented from being optimally positioned and guided. A mushroom-shaped unit attached to one casing is a possible solution.

Indeed, Option 2 is suitable for EOPs (Electric Oil Pumps) of a relatively low output class (less than about 250 W power) and has the advantage of the so-called "cartridge arrangement", in which case the electric oil The entire pump (EOP) is inserted into one hollow chamber and the electronics do not disturb the compartment (see, eg, US Patent Application Publication No. 2019/0003477). An oil pump according to the prior art is also known from DE 10 2017 210 426 A1.

Problems of the invention 1 . Simplification of the electric pump casing (EOP-casing).
2. Simplified assembly process for electric pumps.
3. Reduction of the entire package projection surface.
4. Reduced costs.
5. Realization of optimum cooling for power electronics and motors.

The invention The proposal arranges a circuit carrier, e.g. a PCB, with a pump, an electric or E-motor and power electronics, in particular electrical components, such that the pump is located between the motor and the electronics. It consists of The power electronics have openings for guiding the hydraulic lines, which allow an axial arrangement of the hydraulic lines.

The baseplate on which the power electronics are placed (glued, thermally connected, screwed, crimped, etc.) and the pump pressure plate below define the plane of projection as Grouped for further reduction.

Additionally, the baseplate serves the function of the lower pump pressure plate for certain pump types, particularly when gerotor types are used, and such is generally the prior art for gerotor type EOPs. corresponds to However, combinations of pressure plates and ECU/electronics supports have not heretofore been known.

The pump casing can be replaced, the function of the pump casing reduced or split between the baseplate and the motor casing, thereby reducing size and cost.

Axially arranged hydraulic lines allow the EOP housing to be produced from sheet metal by means of a deep-drawing technique, which provides space for the "base plate" as well as mounting possibilities as follows: Ru:
Option 1: The main components like motors, pumps and electronics are circular (see e.g. Figure 4) OR Option 2: The baseplate (or baseplate/pump pressure plate) and electronics are both is polygonal insofar as it is possible to shape the casing by (see e.g. Fig. 8), or Option 3: e.g. if high power and/or special fixing and assembly means have to be used In, the base plate (or base plate/pump pressure plate) extends out from the deep drawn casing (see, eg, FIG. 2).

All components can be assembled into the casing from one side only, with the power electronics being the last component (concept with common casing, FIG. 4).

At the same time, the electronics protected by the cover are first pre-mounted to the baseplate (or baseplate/pump pressure plate) depending on supply chain regulations, part handling order during the manufacturing/assembly line, and geometric constraints , on the other hand, it is also possible to assemble the pump and motor components last.

Such an arrangement allows heat from the power electronics to be conducted away to the pump components, which creates ideal cooling conditions.

The suction connection of the pump is guided through the motor, which makes it possible to improve the cooling performance of the motor. At the same time, the electric pump (EOP) is sealed against the environment and can thus reach protection class IP6K9K.

Such an arrangement and exchange of pump casings allows a variety of methods for retaining/fixing the baseplate, for example by retaining rings, screws, clamps, bayonet, etc. FIG.

Advantages 1. Reduced space requirements: Such an arrangement optimizes the space requirements of the electric pump, resulting in a smaller package compared to electric pumps with radial hydraulic connections.
2. 3. Replace the pump casing. Faster assembly: the pump components can be placed into the casing from one side and the entire assembled structure can be assembled with few screws or other mechanical retention systems, i.e. retaining rings or bayonet .

1 shows an assembly structure for an electric oil pump according to the prior art; FIG. Figure 2 shows an assembled structure according to the invention; FIG. 4 shows an assembled structure in which the electrical interface is located inside the projection plane of the circuit carrier; Figure 4 shows an assembled structure similar to Figure 3; FIG. 3 shows an assembled structure in which the frictional connections between the individual components are formed by screws; FIG. 3 shows an assembled structure in which the frictional connections between the individual components are formed by screws; Fig. 2 shows a perspective view of the assembly of the assembly structure with a substantially rectangular cover; FIG. 12 shows a perspective view of the assembly of the assembly structure with a substantially polygonal cover;

The prior art is shown in FIG. 1, in which the hydraulic connections 6.1, 6.2 of the pump 1 are arranged radially.

A schematic diagram of the proposed idea is shown in FIG. The electric motor 3 is mounted at the end of the sheet metal casing followed by the pump 1 . The motor 2 and the pump 1 are mechanically connected via a shaft, and the mechanical output from the motor 3 is transmitted to the pump 1 . The lower pump pressure plate 6 and the base plate 5 of the electronics are integrally formed. Hydraulic connections 6.1, 6.2 of pump 1 are integrated in particular in the base plate and pass through openings 7.1 in power electronics board 7. FIG.

The pump 1 and the motor 3 can be integrated into the base plate 5 in a frictional fit by screws 12, among other options such as clamping, welding, press-fitting.

The seals 11 between the components of the assembly can be realized as liquid or solid seals and as radial or axial seals.

The motor 3 and the suction connections 6.1, 6.2 of the pump 1 are not hydraulically separated, which means that the liquid entering the pump 1 rushes into the volume surrounding the motor 3. It means that there is a possibility. The fluid helps lubricate and cool the motor 3 . The pump pressure plate 6 and base plate 5 may be integrated as only one component 5, 6 (as shown) or, depending on the pump type, it may be necessary to incorporate a separate pressure flow separation plate. The geometry of the baseplate can be adapted to suit different pump types (ie gear pumps, gerotor pumps, vane pumps, etc.) and different connection locations. The hydraulic connections 6.1, 6.2 are arranged axially, where their position can be freely changed on the cover plate 8 in order to accommodate different requirements.

Another possible mounting method is shown in FIG. Instead of using screws, a retaining ring can be press-fitted into the casing 4 of the electric pump 1, thereby frictionally connecting the pump components to the base plates 5, 6 by applying an axial force. can. The pump component itself is axially held by the stator of the motor 3 . The power electronics (PCB) 7 may be screwed (not shown) or glued to the base plates 5, 6, for example.

All interfaces 9 required for the functioning of electric pump 1 are located in cover plate 8 . This provides several advantages.

1. No external cables are required for communication between the power electronics and the operating system (ie gear unit). Such an advantage is that the connector is configured axially in the same direction as the hydraulic connection, as shown in FIG. can be used when required.
2. All interfaces are packaged together.
3. The casing of the electric pump does not require additional post-processing to produce the hydraulic connections. Therefore, it can be stamped out of sheet metal in a few steps.
4. All components can be assembled into the casing from the cover side, which simplifies the assembly process and reduces manufacturing time.

Description of the drawings Figure 1 shows an assembly structure M for an electric oil pump 1 according to the prior art. In this case, the lines 6.1, 6.2 for hydraulic fluid are arranged laterally to the oil pump 1. FIG.

FIG. 2 shows an assembly structure M according to the invention, in which the base plate 5 and the lower pump pressure plate 6 are formed in one piece, the pump casing 4 containing the electric motor 3 and the oil pump 1 . are connected to the base plates 5, 6 in a friction-fitting manner by means of screws 12, respectively. The electrical interface 9, in particular the connector for electrically connecting the control unit 7 to an external electrical device outside the assembly M, is the electrical interface 9 different from the circuit support 7. The opposite end is arranged on the electric motor 3 side.

The seals 11 between the components of the assembly can be realized as liquid or solid seals and as radial or axial seals.

The suction line 6.1 and the discharge line 6.2 of the base plates 5, 6 are arranged parallel to the axis A of the oil pump 1 and the electric motor 3 and are closed by corresponding openings 8.n in the cover 8. 1 and a corresponding opening 7.1 in the circuit carrier 7.

FIG. 3 shows an assembly structure M in which the electrical interface 9 is located inside the projection plane of the circuit carrier 7 . The pump casing 4 for accommodating the components of the assembly structure M is constructed accordingly, all components of the assembly structure M being arranged in the pump casing 4 and the base plates 5, 6 being attached. It is retained in the pump casing 4 by a static retaining ring 13 .

FIG. 4 shows an assembly structure M similar to FIG. formed by 13. Interfaces 9 and 10 are not shown in this case.

5 and 6, the friction-fitting connections between the individual components of the assembly structure M are formed by screws 12. In FIGS.

FIG. 7 shows a perspective view of the assembly of the assembly structure M with the substantially rectangular cover 8 and the electrical interfaces 9 on the sides of the cover 8 .

FIG. 8 shows a perspective view of the assembly of the assembly structure M with the substantially polygonal cover 8 .

Claims (12)

An assembly structure (M) for an electric oil pump comprising the following components:
an oil pump (1) consisting of a stator, at least one rotor and upper and lower pump pressure plates (6);
an electric motor unit (2) axially arranged with respect to said oil pump (1) and comprising an electric motor (3) for rotating said oil pump (1);
a pump casing (4) for housing at least the oil pump (1) and the electric motor (3);
a base plate (5) for sealing, orienting and positioning said oil pump (1) and said electric motor (3) within said pump casing (4);
a base plate formed as a lower pump pressure plate (6) with suction lines (6.1) and discharge lines (6.2) for hydraulic liquid;
a circuit support (7) with a control unit for controlling said electric motor (3) and said oil pump (1);
a cover (8) for sealing at least said circuit support (7) towards said base plate (5) or said lower pump pressure plate (6);
In an assembly structure (M) having
The suction line (6.1) and the discharge line (6.2) of the base plate are arranged parallel to the axis (A) of the oil pump (1) and the electric motor (3). and guided through a corresponding opening (8.1) in the cover (8) and a corresponding opening (7.1) in the circuit support (7), Assembly structure (M). Assembly (M) according to claim 1, characterized in that said base plate (5) and said lower pump pressure plate (6) are integrally formed. The pump casing (4) comprises, besides the oil pump (1) and the electric motor (3), additionally at least the base plate (5), the circuit carrier (7) and/or the cover (8). 3. An assembly (M) according to claim 1 or 2, wherein the assembly (M) is formed to accommodate a . An electrical interface (9) for electrically connecting the control unit on the circuit support (7) to an external electrical device outside the assembly structure (M) is located on the circuit support. inside the projection plane of the body (7), guided by the cover (8) towards the outer surface of the assembly structure (M) facing away from the electric motor (3) or towards the cover Assembly structure (M) according to any one of claims 1 to 3, incorporated in (8). An electrical interface (9) for electrically connecting the control unit on the circuit support (7) to an external electrical device outside the assembly structure (M) is located on the circuit support. outside the plane of projection of the body (7), guided by said cover (8) towards the outer surface of said assembly structure (M) located above said electric motor (3) or towards said cover ( Assembly structure (M) according to any one of claims 1 to 3, incorporated in 8). Said pump casing (4) has at least one mechanical interface (10) suitable for connecting said assembly structure (M) to a part of a motor vehicle, in particular to a part of its powertrain. 6. The structure (M) according to any one of claims 1 to 5, wherein a is arranged. Assembly (M) according to any one of the preceding claims, wherein the components of the assembly (M) are liquid-tightly sealed to each other by a seal (11). Assembly structure (M) according to any one of the preceding claims, wherein the components of the assembly structure (M) are connected to each other in a friction-fitting manner. 9. Assembly (M) according to claim 8, characterized in that the components of the assembly (M) are frictionally connected to one another, in particular by means of screws (12) and/or retaining rings (13). A method of manufacturing an assembled structure (M) according to any one of claims 1 to 9, comprising the steps of:
a. providing a pump casing (4);
b. introducing an electric motor unit (2) into said pump casing (4);
c. introducing an oil pump (1) into said pump casing (4);
d. assembling base plate (5), lower pump pressure plate (6), circuit support (7) and cover (8), said base plate (5) and said pump casing (4) being frictionally connected; connecting to each other and thus also sealing said oil pump (1) against said base plate (5);
method including. A method of manufacturing an assembled structure (M) according to any one of claims 1 to 9, comprising the steps of:
a. providing a pump casing (4);
b. introducing an electric motor unit (2) into said pump casing (4);
c. introducing an oil pump (1) into said pump casing (4);
d. introducing a base plate (5) into said pump casing (4);
e. introducing a circuit support (7) into said pump casing (4);
f. introducing a cover (8) into said pump casing (4);
g. forming a frictional connection between components of said assembly structure (M);
method including. Assembly according to claim 10 or 11, wherein the frictional connection between at least two components of said assembly structure (M) is already formed after one of steps c to d or steps c to e. A method of manufacturing the structure (M).

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