DE102017203777A1 - Device for adjusting the oil level in two adjacent oil chambers of a transmission of a motor vehicle - Google Patents

Abstract

There is a device (1) for adjusting the oil level in a first and a second oil chamber (6, 7) of a transmission of a motor vehicle, which are arranged adjacent, wherein in the first oil chamber (6) foamed the oil and undesirable in the second oil chamber (7) oil foam is proposed, which as in the first oil chamber (6) arranged dip tube (4) with integrated check valve (3) in a return flow from the first oil chamber (6) in the second oil chamber (7) is executed, wherein the dip tube (4) has an inlet opening (2) for the oil located in the first oil chamber (6), which is provided in a lower region of the dip tube (4), where the oil jams foam-free, wherein the oil flowing through the inlet opening (2) in the dip tube (4) above the check valve (3) forms an oil column and wherein the check valve (3) only by a foam-free oil column in the dip tube (4) can be opened, which exceeds a predetermined level, wherein the predetermined level of the setpoint oil level in the first oil chamber (6).

Description

The invention relates to a device for adjusting the oil level in a first and a second oil chamber of a transmission of a motor vehicle, which are arranged adjacent, wherein in the first oil space the oil foams and in the second oil space oil foam is undesirable, according to the preamble of claim 1.

In motor vehicle transmissions, which have two adjacent oil compartments, for example gearboxes, which have e.g. as a gear in planetary design running central gear and realized by means of front wheels Vorderachsabtrieb i. a transfer case to be set in the two oil chambers each have a different oil level, with an oil circuit between the two oil chambers is required because the type of oil is the same. In this case, the oil may be foamed in one of the oil chambers, for example in the oil chamber of the transfer case, with a foaming of oil in the other oil chamber is not permitted.

From the JP 2008 045 701 A2 It is known to realize an oil level compensation between two oil chambers with different filling levels by means of an opening valve, which is actuated by a float.

Furthermore, goes from the DE 10 2014 205 881 B3 a geared motor having an electric motor with a housing and disposed therein a stator and a rotor, wherein a gear assembly comprising a transmission with a lubrication system is mechanically connected to the rotor and the transmission is disposed within the rotor of the electric motor. In the known geared motor, the lubrication circuit system comprises a lubricant reservoir, a lubricant pressure pump and a Schmiermittelsaugpumpe, the lubricant pressure pump on the input side via a pressure pump inlet line to the lubricant reservoir and the output side is connected via a pressure pump output line to the transmission and the Schmiermittelsaugpumpe via a Saugpumpeneingangsleitung with the transmission and the output side via a Saugpumpenausgangsleitung connected to the lubricant container; the lubricant reservoir is arranged spatially next to the transmission and connected to the transmission via a lubricant equalization line.

The present invention has for its object to provide a device for adjusting the oil level in a first and a second oil chamber of a transmission of a motor vehicle, which are arranged adjacent to, foamed in the first oil chamber, the oil and in the second oil chamber oil foam is undesirable. By the device according to the invention a predetermined oil level difference is to be realized independently of braking and accelerating or from the roadway inclination between the two oil chambers, without transporting oil foam from the first into the second oil chamber.

This object is solved by the features of patent claim 1. Further embodiments and advantages will become apparent from the dependent claims.

Accordingly, a device for adjusting the oil level in a first and a second oil chamber of a transmission of a motor vehicle, which are arranged adjacent proposed, which is designed as arranged in the first oil chamber dip tube with integrated check valve in a return flow from the first oil chamber into the second oil chamber. The dip tube may preferably be arranged along the longitudinal axis of the vehicle viewed in the middle of the first oil chamber.

Here, the inlet opening for the oil is provided in a lower portion of the dip tube where the oil jams foam-free, so that only foam-free oil can flow through this inlet, wherein the oil flowing through the inlet opening in the dip tube above the check valve forms an oil column and the check valve can only be opened by a foam-free oil column in the dip tube, which exceeds a predetermined level, wherein the predetermined level corresponds to the target oil level in the first oil chamber.

In the event that foamed oil is in the oil column, the weight of the oil column is insufficient to open the check valve. According to the invention, the dip tube has at its upper end on a breather hole, whereby air can escape, so that the function of the device is ensured.

When braking or accelerating or when not flat road, in situations where the oil would flow without the inventive device from the second into the first oil chamber, no oil from the second oil chamber into the first oil chamber flow, since the check valve in the dip tube, the channel between the closes both oil chambers. Such a situation occurs e.g. when the first oil space is arranged axially behind the second oil space when viewed axially in the forward direction of travel of the vehicle and the vehicle accelerates or ascends.

Further, when braking or accelerating or when not flat road in situations where the oil would flow without the inventive device from the first to the second oil space, no oil from the first flow into the second oil chamber, as by the axial arrangement of the dip tube In the first oil chamber, the oil level and thus the oil column in the dip tube is relatively stable. Such a situation occurs, for example, when the first oil chamber, viewed axially in the forward direction of travel of the vehicle, is arranged behind the second oil chamber and the vehicle is decelerating or descending.

The design according to the invention ensures that, irrespective of the roadway inclination and the acceleration behavior of the vehicle while maintaining a predetermined oil level difference, only superfluous, foam-free oil can flow from the first oil space into the second oil space.

• 1: eine schematische Schnittansicht einer gemäß der Erfindung ausgeführten Vorrichtung zur Ölstandseinstellung;
• 2: eine schematische Schnittansicht eines ersten und eines zweiten Ölraums eines Getriebes eines Kraftfahrzeugs, die benachbart angeordnet sind und einer im ersten Ölraum angeordneten erfindungsgemäßen Vorrichtung zur Veranschaulichung der Funktionsweise der Vorrichtung;
• 3: eine schematische Schnittansicht der Anordnung gemäß 2 beim Beschleunigen des Fahrzeugs oder bei einer Bergauffahrt; und
• 4: eine schematische Schnittansicht der Anordnung gemäß 2 beim Abbremsen des Fahrzeugs oder bei einer Bergabfahrt.

The invention will be explained in more detail below by way of example with reference to the attached figures. Show it:

• 1 FIG. 2 is a schematic sectional view of an oil level adjusting device according to the invention; FIG.
• 2 a schematic sectional view of a first and a second oil chamber of a transmission of a motor vehicle, which are arranged adjacent and arranged in the first oil chamber device according to the invention for illustrating the operation of the device;
• 3 FIG. 2: a schematic sectional view of the arrangement according to FIG 2 when accelerating the vehicle or when driving uphill; and
• 4 FIG. 2: a schematic sectional view of the arrangement according to FIG 2 when braking the vehicle or when going downhill.

According to the invention and with reference to the attached figures, a device 1 for adjusting the oil level in a first and a second oil chamber 6 . 7 a transmission of a motor vehicle, which are arranged adjacent, proposed, which as in the first oil chamber 1 arranged dip tube 4 with integrated non-return valve 3 in a reflux from the first oil room 6 in the second oil room 7 is executed. In the example shown is the dip tube 4 viewed along the longitudinal axis of the vehicle in the middle of the first oil chamber 6 arranged. In the examples shown, the first oil chamber 6 viewed axially in the forward direction of travel of the vehicle behind the second oil chamber 7 arranged. The first oil room 6 may be the oil chamber of a transfer case, wherein the second oil chamber 7 the oil chamber of a central transmission of the vehicle, for example, a planetary gearbox can be. The nominal oil level in the first oil chamber 6 is higher than the oil level in the second oil chamber 7 ,

The dip tube 4 has an inlet opening 2 for that in the first oil room 6 located oil, which in a lower portion of the dip tube 4 is provided, where the oil in the first oil room 6 jams foam-free, with the oil flowing through the inlet opening in the dip tube 4 above the check valve 3 forms an oil column.

The provided in the dip tube check valve 3 is according to the invention only by a foam-free oil column in the dip tube 4 openable when the oil column exceeds a predetermined level, wherein the predetermined level corresponds to the target oil level in the first oil chamber. The default level is in 2 through the dashed line A illustrated. Through the dashed line B is in 2 the oil flow from the first oil room 6 in the second oil room 7 with open check valve 3 illustrated.

In the event that foamed oil is in the oil column, the weight of the oil column is insufficient to open the check valve. In the example shown, the dip tube 4 at its upper end a breather hole 5 can escape through the air, if there is foamed oil in the oil column, so that the function of the device is ensured. Oil can be pumped 8th and a corresponding line 9 controlled by the second oil chamber 7 flow into the first oil chamber to set the desired level.

If, in the example shown, the vehicle is accelerated or driven uphill, no oil from the second oil chamber can 7 in the first oil room 6 flow as the check valve 3 in the dip tube 4 the channel between the two oil chambers 6 . 7 closes, as based on 3 illustrated.

Subject of the 4 is the situation during vehicle deceleration or downhill; in this case, no oil from the first oil chamber 6 in the second oil room 7 flow, as due to the axial arrangement of the dip tube 4 in the first oil room 6 the oil level and thus the height of the oil column in the dip tube 4 is stable.

LIST OF REFERENCE NUMBERS

1

contraption

2

inlet opening

3

check valve

4

dip tube

5

bleeding hole

6

first oil room

7

second oil room

8th

pump

9

management

A

Target oil level in the first oil chamber 6

B

Oil flow from the first oil room 6 in the second oil room 7 with open check valve 3

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• JP 2008045701 A2 [0003]
• DE 102014205881 B3 [0004]

Claims (4)

Device (1) for adjusting the oil level in a first and a second oil chamber (6, 7) of a transmission of a motor vehicle, which are arranged adjacent, wherein in the first oil chamber (6) the oil foams and in the second oil chamber (7) oil foam is undesirable, characterized characterized in that it is constructed as a dip tube (4) with integrated check valve (3) arranged in the first oil chamber (6) in a return flow from the first oil chamber (6) into the second oil chamber (7), the dip tube (4) having an inlet opening (4). 2) for the in the first oil chamber (6) located oil which is provided in a lower portion of the dip tube (4), where the oil jams foam free, wherein the through the inlet (2) flowing oil in the dip tube (4) over the check valve (3) forms an oil column and wherein the check valve (3) only by a foam-free oil column in the dip tube (4) can be opened, which exceeds a predetermined level, wherein the predetermined level to the target Ö Lstand in the first oil room (6) corresponds. Device (1) for adjusting the oil level in a first and a second oil chamber (6, 7) of a transmission of a motor vehicle, which are arranged adjacent, wherein in the first oil chamber (6) foamed the oil and in the second oil chamber (7) oil foam is undesirable Claim 1 , characterized in that the dip tube (4) along the longitudinal axis of the vehicle viewed in the middle of the first oil chamber (6) is arranged. Device (1) for adjusting the oil level in a first and a second oil chamber (6, 7) of a transmission of a motor vehicle, which are arranged adjacent, wherein in the first oil chamber (6) foamed the oil and in the second oil chamber (7) oil foam is undesirable Claim 1 or 2 , characterized in that the dip tube (4) has at its upper end a breather hole (5) through which air can escape when there is foamed oil in the oil column. Device (1) for adjusting the oil level in a first and a second oil chamber (6, 7) of a transmission of a motor vehicle, which are arranged adjacent, wherein in the first oil chamber (6) foamed the oil and in the second oil chamber (7) oil foam is undesirable Claim 1 . 2 or 3 , characterized in that the first oil chamber (6) is the oil chamber of a transfer case, wherein the second oil chamber (7) is the oil chamber of a central transmission of the vehicle.

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