DE102012222795B4 - Motor vehicle with a drive motor and a device for generating a negative pressure for a servo consumer - Google Patents

Abstract

Motor vehicle with a drive motor (17) and a device (1) for generating a negative pressure for a servo consumer (3) comprising a vacuum pump (2) and an electric motor (7), wherein the vacuum pump (2) by the electric motor (7) to the electric motor Generation of the negative pressure is operable, further comprising at least a first lubricant supply line (4) and a lubricant reservoir (11), wherein a lubricant via the first lubricant supply line (4) for lubricating at least one component of the vacuum pump (2) can be supplied, wherein the lubricant in the first lubricant supply line (4) can be supplied by the negative pressure generated by the vacuum pump (2), wherein the first lubricant line (4) is permanently connected to the lubricant container (11), so that the lubrication of the at least one component of the vacuum pump (2) also is possible at standstill of the drive motor (17), while the vacuum P umpe (2) operated by an electric motor is characterized in that a second lubricant supply line (14) with the vacuum pump (2) and the drive motor (17) is permanently connected.

Description

Field of the invention

The present invention relates to a motor vehicle with a drive motor and a device for generating a negative pressure for a servo consumer comprising a vacuum pump and an electric motor, wherein the vacuum pump is operated by the electric motor by an electric motor to generate the negative pressure, further comprising at least a first lubricant supply line and a lubricant reservoir, wherein a lubricant via the first lubricant supply line for the lubrication of at least one component of the vacuum pump can be fed.

State of the art

Such vacuum pumps may be formed, for example in the form of a vane pump with one or more wings.

From the DE 10150302B4 is a vacuum pump known. In this system, the vacuum pump is connected to a lubricant circuit of the motor vehicle engine.

An electrically operated vacuum pump is used in the DE 10 2006 022 772A1 described. In this vacuum pump, the bearing of the rotating drive shaft is lubricated by resources such as oil.

In the applications mentioned, however, lubrication of the vacuum pump at standstill of the drive motor can no longer be guaranteed. The WO 2010/130238 A2 discloses a vacuum pump with a suction chamber in which a vacuum is generated during operation of the vacuum pump, and with a lubricant inlet. The disclosed vacuum pump is characterized in that the lubricant inlet is so in communication with the suction chamber, that the vacuum pump itself by the negative pressure generated during operation of the vacuum pump is superabsorbent for the lubricant.

Summary of the invention

It is an object of the invention to provide a motor vehicle with a drive motor and a device for generating a negative pressure, for servo consumers such as brake booster in motor vehicles, by means of a vacuum pump, wherein the lubrication of the vacuum pump is ensured even when a drive motor.

The object is achieved by a motor vehicle having a drive motor and a device for generating a negative pressure for a servo consumer comprising a vacuum pump and an electric motor, wherein the vacuum pump by the electric motor by electric motor to generate the negative pressure is operable, further comprising at least a first lubricant supply line and a Lubricant container, wherein a lubricant is supplied via the first lubricant supply line for lubricating at least one component of the vacuum pump, wherein the lubricant in the first lubricant supply line can be supplied by the negative pressure generated by the vacuum pump, wherein the first lubricant line is permanently connected to a lubricant reservoir, so that the lubrication of the at least one component of the vacuum pump is also possible when the drive motor is at a standstill, while the vacuum pump operates by an electric motor ben will. The lubricant further serves to cool the vacuum pump or to seal within the pump chamber.

For example, an internal combustion engine or, in the case of a hybrid or electric vehicle, an electric motor can be understood as the drive motor.

Further developments of the invention are specified in the dependent claims, the description and the accompanying drawings.

Preferably, the means for generating a negative pressure comprises a first means for reducing the lubricant flow, wherein the first means for reducing the lubricant flow is permanently connected to the first lubricant supply line.

The means for reducing the lubricant flow fulfills the task that the amount of lubricant that can be sucked in can be limited.

In a preferred embodiment, a lubricant filter is arranged in the first lubricant supply line.

Solid and liquid contaminants are the cause of increased abrasion, wear and corrosion. The lubricant filter is used to clean the lubricant from these contaminants, which can increase the life of the vacuum pump.

The device for generating a negative pressure has a second lubricant supply line, wherein the lubricant supply line to the vacuum pump and the drive motor is permanently connected.

In electric vehicles that have no oil pan, the lubricant supply line may be connected to the transmission housing.

Preferably, the second lubricant supply line is permanently connected to a second means for reducing the lubricant flow.

In another inventive embodiment, the first lubricant supply line and the second lubricant supply line are connected to a first inlet and / or second inlet.

Depending on whether one or more lubricant supply lines are used, one or more inlets may be formed in the vacuum pump. However, it is also conceivable that when using multiple lubricant lines, a common inlet, for example, the inlet for a servo consumer can be used to supply lubricant. However, it is also possible, depending on the embodiment, that a separate inlet is provided for a connecting line of the servo load and for the plurality of lubricant supply lines, or the lines are connected in all possible combinations without impairing the functionality of the vacuum pump. It should be achieved with the different connection or connection options that due to structural conditions in the engine compartment of a motor vehicle, the most cost-effective or simplest solution can be realized.

According to a further embodiment of the invention, the lubricant reservoir can be arranged directly at the second inlet of the vacuum pump.

In this embodiment, the second inlet, which is, for example, a bore in the vacuum pump, simultaneously forms the second lubricant supply line, the inlet being in direct communication with the lubricant container.

In this embodiment, no or no long lubrication line course is required.

The lubricant container can be advantageously integrated in the housing of the vacuum pump.

The pump housing is formed so that it has an additional chamber in which the lubricant can be accommodated. The lubricant container is advantageously connected via an inlet in the vacuum pump directly to the pump chamber.

The lubricant container is at least partially filled with a resource, preferably oil such as engine oil or gear oil. An overflow line in the lubricant reservoir, which is connected, for example, to the cylinder head of the drive motor, prevents overflow of the lubricant reservoir.

In electric vehicles, the overflow line of the lubricant reservoir is connected to the transmission housing.

The housing of a pressure pump is custom-made for the most part by injection molding, wherein the housing is metallic. For cost and / or weight reasons, housings are made of plastic.

The housing essentially has a pump chamber or working chamber in which the vacuum required for the servo consumer is generated. In the pump chamber, a stator ring, a rotor with one or more sliders, which are accommodated in the rotor or in the stator ring, are arranged substantially in the case of vane pumps. The pump housing has at least one inlet, wherein the inlet via a connecting line with at least one servo load, such as a brake booster, permanently connected. The pump housing further includes mounting options for connecting or mounting the vacuum pump with another component.

In a further embodiment, the lubricant container is the oil sump of a drive motor. Alternatively, the lubricant container in electric vehicles may be the transmission housing.

The vacuum pump is permanently connected via a second lubricant supply line to the oil sump for sucking lubricant.

In a particular embodiment, the vacuum pump is integrated in the oil pan, whereby the length of the lubricant supply line can be minimized.

The lubricant supply line may be formed in a particular embodiment in the vacuum pump as a second inlet.

This embodiment is preferably used when either the lubricant container in the vacuum pump, or the vacuum pump is integrated in the oil pan.

In electric vehicles, the vacuum pump may be integrated in the transmission housing.

In order to be able to influence the passage rate of the at least first and / or second means, the first and / or second means may be adjustable. Such agents are preferably chokes or orifices. However, it is also conceivable that nozzles are used. Also, the lubricant supply line may function as a means for reducing the lubricant flow through a portion which tapers in the passage.

In a faulty connection of the electric motor in which the vacuum pump can be driven in the wrong direction, a check valve is arranged in a preferred embodiment in the second lubricant supply line. This is to prevent that air can be promoted in the drive motor. The check valve is thereby arranged downstream of the second means for reducing the lubricant flow in the lubricant supply line. In a further embodiment, the non-return valve and the second means for reducing the lubricant flow combined are formed as a throttle check valve. The check valve is designed so that it can only be opened by the vacuum pump if there is an overpressure in the engine compartment. The overpressure in the engine compartment is created by an oil pump, which conveys oil from the oil sump to engine components to be lubricated with overpressure. At standstill an internal combustion engine, the oil pump generates no pressure in the engine compartment, whereby the check valve is closed by a spring. This prevents the vacuum pump from continuing to draw oil from the engine compartment, which would provide lubricated engine components with insufficient oil and would be insufficiently lubricated at the next start-up of the drive motor, thus risking damage to these engine components.

The vacuum pump has a return line through which the lubricant can flow back into the lubricant reservoir. In the return line, a check valve and an oil-air separator are preferably arranged. In the oil-air separator, the ejected air and the oil are separated from each other. The cleaned air is discharged outside into the engine compartment and the separated oil into the lubricant reservoir. The check valve should in this case prevent suction of oil from the lubricant container, if the vacuum pump, for example, by incorrect connection of the electric motor should be driven in the opposite direction.

Brief description of the drawings

The invention will now be described by way of example with reference to the drawings.

1 shows a first principle of a device for generating a negative pressure.

2 shows a second principle of a device for generating a negative pressure.

Detailed description of the invention

In 1 a device arrangement according to the invention is shown, which is essentially a device 1 includes, wherein the device 1 a vacuum pump 2 includes that of an electric motor 7 for generating a negative pressure for a servo consumer 3 , For example, a brake booster, driven. The servo consumer 3 is via a connection line 12 permanently connected to the vacuum pump. In the connection line 12 is a check valve 13 arranged. The check valve 13 prevents a faulty connection of the electric motor 7 in which the vacuum pump 2 is driven in the wrong direction, an overpressure or lubricant in the servo consumer 3 can get. The lubricant is used to lubricate at least one component of the vacuum pump 2 around the life of the vacuum pump 2 to increase by reducing friction and heat. The vacuum pump 2 sucks through during operation of the vacuum pump 2 generated negative pressure lubricant via a first lubricant supply line 4 from a lubricant container 11 , To contamination of the vacuum pump 2 to prevent is in the lubricant supply line 4 a lubricant filter 6 arranged. A first remedy 5 serves to reduce the lubricant flow into the vacuum pump 2 , The first means 5 may preferably be a throttle, a diaphragm or a nozzle. In a further preferred embodiment, the first means 5 adjustable, whereby the lubricant flow can be controlled specifically. The lubricant supply line 4 can be like in 1 represented a separate inlet in the vacuum pump 2 have, or alternatively with the connecting line 12 be coupled and via a common inlet with the vacuum pump 2 be connected. The vacuum pump 2 has a return line 8th on. The return line 8th directs excess lubricant into the lubricant reservoir 11 back. One in the return line 8th arranged oil-air separator 10 This also cleans the lubricant and dissipates the purified air to the outside to the outside.

2 is an extension of the device 1 according to 1 , The device 1 here has a second lubricant supply line 14 on. The second lubricant line 14 is with the vacuum pump 2 and the drive motor 17 permanently connected. In the second lubricant supply line 14 is a second means 15 arranged to reduce the lubricant flow. The second means 15 may preferably be a throttle, a diaphragm or a nozzle. In a further preferred embodiment, the second means 15 adjustable, whereby the lubricant flow can be controlled specifically. For example, when the drive motor is at a standstill 17 the second means 15 be closed, resulting from the drive motor 17 no lubricant can be sucked. The first means 5 to reduce the lubricant flow can be further opened to more lubricant from the lubricant reservoir 11 to be able to suck. A check valve 16 prevents the vacuum pump 2 with incorrect connection of the electric motor 7 Air in the drive motor 17 can promote. The first lubricant line 4 and the second lubricant line 14 can have separate inlets in the vacuum pump 2 exhibit. Alternatively, however, it is conceivable that the first and the second lubricant line 4 . 14 a common inlet in the vacuum pump 2 have, or that they are over the inlet of the connecting line 12 with the vacuum pump 2 are connected. In the device arrangement of 2 is a lubricant filter 6 not required, as the lubricant filter of the drive motor 17 can be used to clean the lubricant.

LIST OF REFERENCE NUMBERS

1

contraption

2

Vacuum pump

3

Power consumers

4

first lubricant supply line

5

first means

6

lubricant filter

7

electric motor

8th

Rücklauleitung

9

check valve

10

Oil-air separator

11

lubricant reservoir

12

connecting line

13

check valve

14

second lubricant supply line

15

second means

16

check valve

17

drive motor

Claims (14)

Motor vehicle with a drive motor ( 17 ) and a device ( 1 ) for generating a negative pressure for a servo consumer ( 3 ) comprising a vacuum pump ( 2 ) and an electric motor ( 7 ), whereby the vacuum pump ( 2 ) by the electric motor ( 7 ) is operable by an electric motor to generate the negative pressure, further comprising at least one first lubricant supply line ( 4 ) and a lubricant container ( 11 ), wherein a lubricant via the first lubricant supply line ( 4 ) for lubricating at least one component of the vacuum pump ( 2 ), wherein the lubricant in the first lubricant supply line ( 4 ) by the vacuum pump ( 2 ), wherein the first lubricant line ( 4 ) with the lubricant container ( 11 ) is permanently connected, so that the lubrication of the at least one component of the vacuum pump ( 2 ) even when the drive motor is at a standstill ( 17 ) while the vacuum pump ( 2 ) is operated by an electric motor, characterized in that a second lubricant supply line ( 14 ) with the vacuum pump ( 2 ) and the drive motor ( 17 ) is permanently connected. Motor vehicle with a drive motor ( 17 ) and a device ( 1 ) for generating a negative pressure according to claim 1, characterized in that at least a first means ( 5 ) for reducing the lubricant flow with the first lubricant supply line ( 4 ) is permanently connected. Motor vehicle with a drive motor ( 17 ) and a device ( 1 ) for generating a negative pressure according to claim 1, characterized in that in the first lubricant supply line ( 4 ) a lubricant filter ( 6 ) is arranged. Motor vehicle with a drive motor ( 17 ) and a device ( 1 ) for generating a negative pressure according to claim 1, characterized in that at least one second means ( 15 ) for reducing the lubricant flow with the second lubricant supply line ( 14 ) is permanently connected. Motor vehicle with a drive motor ( 17 ) and a device ( 1 ) for generating a negative pressure according to claim 1, characterized in that the first lubricant supply line ( 4 ) and the second lubricant supply line ( 14 ) with a first and / or second inlet of the vacuum pump ( 2 ) are connected. Motor vehicle with a drive motor ( 17 ) and a device ( 1 ) for generating a negative pressure according to claim 5, characterized in that the lubricant container ( 11 ) at the second inlet of the vacuum pump ( 2 ) is arranged. Motor vehicle with a drive motor ( 17 ) and a device ( 1 ) for generating a negative pressure according to claim 1, characterized in that the lubricant container ( 11 ) in the housing of the vacuum pump ( 2 ) is integrated. Motor vehicle with a drive motor ( 17 ) and a device ( 1 ) for generating a negative pressure according to claim 1, characterized in that the lubricant container ( 11 ) the oil pan of the drive motor ( 17 ). Motor vehicle with a drive motor ( 17 ) and a device ( 1 ) for generating a negative pressure according to claim 1, characterized in that the vacuum pump ( 2 ) in the oil sump of the drive motor ( 17 ) is integrated. Motor vehicle with a drive motor ( 17 ) and a device ( 1 ) for generating a negative pressure according to claim 7 or 9, characterized in that the first lubricant supply line ( 4 ) as a second inlet in the vacuum pump ( 2 ) is trained. Motor vehicle with a drive motor ( 17 ) and a device ( 1 ) for generating a negative pressure according to claim 2 and / or 4, characterized in that the passage amount of the at least first and / or second means ( 5 . 15 ) is adjustable to reduce the lubricant flow. Motor vehicle with a drive motor ( 17 ) and a device ( 1 ) for generating a negative pressure according to claim 1, characterized in that the second lubricant supply line ( 14 ) a check valve ( 16 ) having. Motor vehicle with a drive motor ( 17 ) and a device ( 1 ) for generating a negative pressure according to claim 5 and 12, characterized in that the check valve ( 16 ) downstream of the second means ( 15 ) is arranged to reduce the lubricant flow, or that the check valve ( 16 ) and the second ( 15 ) combined to reduce the lubricant flow is designed as a throttle check valve. Motor vehicle with a drive motor ( 17 ) and a device ( 1 ) for generating a negative pressure according to claim 1, characterized in that from the vacuum pump ( 2 ) a return line ( 8th ) to the lubricant reservoir ( 11 ), wherein the return line ( 8th ) preferably a check valve ( 9 ) and an oil-air separator ( 10 ) having.

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