Transmission for motor vehicle

Abstract

The utility model relates to a transmission (1) for a motor vehicle (2). The transmission at least comprises the following components: a plurality of driving wheels (3, 4, 5, 6); a transmission housing (7) having a transmission space (8) in which at least one of the plurality of transmission wheels (3, 4, 5, 6) is arranged; an oil line (9) for conducting transmission oil (10) into the transmission housing (7) in order to lubricate the plurality of transmission wheels (3, 4, 5, 6), a leakage opening (11) being provided in the oil line (9) for discharging the transmission oil (10) into a transmission space (8) of the transmission housing (7).

Description

Technical Field

[0001] The utility model relates to a transmission for a motor vehicle. Background Art

[0002] In a hybrid transmission (DHT, dedicated hybrid transmission), the bearings and gears are supplied with transmission oil via the differential from an oil sump which is located lower under normal driving conditions. If the hybrid transmission is accelerated or the hybrid transmission tilts or sways, or tilts or sways relative to the installation position of the motor vehicle equipped with the hybrid transmission, the oil level in the oil sump may change, so that the oil supply to the higher bearings and / or gears may be interrupted. Utility Model Content

[0003] On this basis, the purpose of the present invention is to at least partially overcome the disadvantages known in the prior art. The features of the present invention are derived from the independent claims, and the advantageous design solutions of the independent claims are presented in the dependent claims. The features of the claims can be combined in any technically meaningful way, wherein the explanations in the following description and the features in the drawings can also be used for this purpose, which include the supplementary design solutions of the present invention.

[0004] The utility model relates to a transmission for a motor vehicle, the transmission having at least the following components:

[0005] -Multiple transmission wheels;

[0006] a transmission housing having a transmission space, wherein at least one transmission gear is arranged in the transmission space;

[0007] - an oil line for guiding the transmission oil into the transmission housing for lubricating the drive wheels,

[0008] In this case, a leakage opening is provided in the oil line for allowing the transmission oil to flow out into the transmission space of the transmission housing.

[0009] In the following, when the axial direction, radial direction or circumferential direction and the corresponding terms are used without explicit indication to the contrary, reference is made to the respectively corresponding rotation axis. Unless explicitly stated to the contrary, the ordinal numbers used in the preceding and following descriptions are only used for clear distinction and do not reflect the order or ranking of the relevant components. An ordinal number greater than one does not necessarily mean that another such component must exist.

[0010] According to a first aspect, the invention relates to a hybrid transmission having an oil collecting funnel in a transmission housing.

[0011] In order to solve the aforementioned problem of interrupted oil supply or at least to reduce it or limit it to a few extreme cases, in one embodiment, an oil port is integrated as a leakage port on the hydraulic transmission actuator (so-called smart hydraulic actuator). Additional transmission oil is provided via this leakage port. In addition, a guide device (for example in the form of a collecting funnel) is preferably integrated in the transmission housing in an oil distributor provided for at least one of the drive wheels (mostly on the internal combustion engine side), which collects the transmission oil provided via the leakage port on the actuator side (even in the case of an inclined position or lateral acceleration) and guides it, for example, to the toothed meshing.

[0012] The (for example funnel-shaped) guide device is designed to ensure supply in an inclined position and to meet the most common operating conditions of a motor vehicle (for example in the form of a hybrid vehicle). Suitable or advantageous embodiments are mentioned below for this purpose.

[0013] In one embodiment, at least one of the transmission wheels is a gear. In one embodiment, at least one of the transmission wheels is a spur gear. In one embodiment, such a transmission wheel designed as a gear has a helical toothing.

[0014] In one embodiment, an oil sump is provided, wherein at least one drive wheel is immersed in the oil sump when the oil sump is filled according to the design. In this case, the transmission oil is entrained by the relevant drive wheel due to adhesive adhesion as in the case of a paddle wheel and is distributed in the transmission chamber or in a corresponding housing section of the transmission chamber for conducting the oil.

[0015] In one specific embodiment, the surface level of the oil sump or of the transmission oil contained in the oil sump is defined by a target level with reference to the installation position.

[0016] In one embodiment, an oil inlet is provided from a supply system. The oil inlet is connected to the transmission housing, for example, via an oil line, so that transmission oil can be fed from the outside into the transmission housing. In one embodiment, the oil inlet is a (separate) pump, by which transmission oil can be fed into the transmission housing as required (for example, a so-called intelligent hydraulic actuator).

[0017] The installation position corresponds to a position in the earth's gravitational field, in which the motor vehicle stands unloaded (stationary) on a horizontal surface, ie, for example, on a road surface without an inclination.

[0018] In one embodiment, the mounting position has an angular tolerance relative to this horizontal plane, which may be up to 1° (angle of 360°).

[0019] In one embodiment, the oil line or its leakage opening is arranged in the transmission housing so that in the installed position the transmission oil flows passively from the leakage opening to the oil pan. In one embodiment, the oil line or its leakage opening is arranged in the transmission housing so that in the installed position the transmission oil flows passively from the leakage opening to the toothing and / or the bearing play or the rolling elements of at least one of the drive wheels.

[0020] Furthermore, in an advantageous embodiment of the transmission it is provided that in the installed position the leakage opening points from the oil line downward into the transmission chamber.

[0021] Furthermore, in an advantageous embodiment of the transmission it is provided that the leakage opening is arranged in the region of the pump device.

[0022] In one embodiment, the pump device is a delivery wheel and the leakage opening is arranged in a pump housing which accommodates the delivery wheel. In one embodiment, the pump device is a cylinder-piston device and the leakage opening is arranged in the cylinder.

[0023] In one embodiment, the leakage opening is arranged in the pump housing or in the cylinder in the low-pressure area. The leakage opening is arranged, for example, in the area of ​​the minimum stroke or in the area of ​​the bottom dead center of the piston (ie in the maximum volume in the cylinder) or in the ventilation device.

[0024] Furthermore, in an advantageous embodiment of the transmission it is provided that the leakage opening is arranged laterally with respect to the center of the pump device.

[0025] The center of the pump device is the rotation axis in a rotary system and the lifting axis in a lifting system. The leakage opening is arranged on its side, that is, offset therefrom in the radial direction.

[0026] In one embodiment, the center of the pump device in a system with a directional valve is the directional valve. The leakage opening is arranged laterally of a closing element of such a directional valve, ie, before or after the closing element.

[0027] Furthermore, in an advantageous embodiment of the transmission, it is provided that a guide device is provided in the transmission chamber for guiding the transmission oil to the oil sump.

[0028] Furthermore, in an advantageous embodiment of the transmission it is provided that the guide device is arranged in the transmission space in the installed position below a drive wheel of the plurality of drive wheels which is located below the leakage opening in the installed position.

[0029] Furthermore, in an advantageous embodiment of the transmission, a collecting conductor is provided which has a collecting opening and an oil outlet and serves to guide the transmission oil from its collecting opening in a directed manner to its oil outlet, wherein the collecting conductor is arranged below the leakage opening in the installed position.

[0030] In one embodiment, the collecting opening is designed as a wider opening and the oil outlet is designed as a narrower opening, or the pipeline section arranged therebetween is narrowed relative to the collecting opening, so that the collecting conductor is formed in a funnel shape.

[0031] In one embodiment, the collecting opening is preferably arranged with clearance, close to the leakage opening and without an enlarged opening. In one embodiment, the collecting conductor is designed with a constant hydraulic diameter from the collecting opening to the oil outlet.

[0032] Furthermore, in an advantageous embodiment of the transmission, it is provided that the guide device in the transmission chamber is arranged in the installed position below a drive wheel of the plurality of drive wheels which in the installed position is located below the oil outlet of the collecting conductor.

[0033] Furthermore, in an advantageous embodiment of the transmission it is provided that the collecting conductor is closed beside at least one adjacent drive wheel of the plurality of drive wheels.

[0034] In one embodiment, in the event of an interruption in the oil supply or a risk of such an interruption, wetting of the adjacent transmission housing is disadvantageous, since the transmission oil does not or does not reliably reach the desired location, such as the oil pan or another drive wheel. It is therefore proposed that the transmission oil guided by means of the collecting conductor shields the drive wheel adjacent thereto, in such a design that the collecting conductor is closed laterally or in the conveying direction.

[0035] Furthermore, in an advantageous embodiment of the transmission it is provided that the collecting conductor extends past one of the adjacent transmission housings at a distance which is narrower than the distance of the oil outlet of the collecting conductor to the drive wheel which is arranged further downward in the installed position.

[0036] Furthermore, in an advantageous embodiment of the transmission it is provided that the collecting conductor is formed from plastic.

[0037] In one embodiment the plastic is a polyamide, such as PA66.

[0038] Furthermore, in an advantageous embodiment of the transmission it is provided that the collecting conductor is connected in a positive-locking manner to an oil distributor for one of the drive wheels.

[0039] In one specific embodiment, the oil distributor is a partition wall between a dry or relatively dry area and a wet or relatively wet area (housing section for conducting oil) in the transmission housing.

[0040] In one embodiment, the form-fit connection is formed by means of a snap-lock or other undercut. In one embodiment, the oil distributor is a component made of plastic or comprises a region made of plastic. The precisely fitting form-fit connection, preferably with an undercut or snap-lock, can be easily implemented by means of a fitting part made of plastic.

[0041] Furthermore, in an advantageous embodiment of the transmission it is provided that the collecting conductor is an integral component of an oil distributor for one of the drive wheels.

[0042] Furthermore, in an advantageous embodiment of the transmission it is provided that the transmission is a hybrid transmission for an internal combustion engine and an electric drive machine.

[0043] In one specific embodiment, the hybrid transmission is a so-called DHT (English: Dedicated Hybrid Transmission).

[0044] Furthermore, in an advantageous embodiment of the transmission it is provided that a further one of the transmission gears is arranged on the intermediate shaft.

[0045] In one embodiment, the intermediate shaft is a so-called transmission shaft of a gear mechanism. In one embodiment, the intermediate shaft is a drive connection between a transmission section (eg, gear mechanism) and a differential.

[0046] Furthermore, in an advantageous embodiment of the transmission it is provided that a third of the transmission wheels is assigned to the gear mechanism.

[0047] Furthermore, in an advantageous embodiment of the transmission it is provided that a transmission shaft is assigned to one of the drive wheels, which is oriented coaxially to a rotor shaft of the electric drive machine.

[0048] In one embodiment, the transmission shaft is designed as a hollow shaft, wherein the rotor shaft passes through the transmission shaft. In one embodiment, the transmission shaft is separably connected to the rotor shaft in a torque-transmitting manner.

[0049] Furthermore, in an advantageous embodiment of the transmission, it is provided that a transmission shaft is assigned to one of the drive wheels, which, during use, is connected in a rotationally fixed manner to a rotor shaft of the electric drive machine.

[0050] In one embodiment, the transmission shaft and the rotor shaft are formed in one piece. In one embodiment, the transmission shaft and the rotor shaft are connected to each other in a rotationally fixed manner by means of a mounted connection, such as a spline, a central screw and / or an annular screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The above utility model is described in detail below with reference to the drawings showing preferred design solutions in the context of the relevant technology. The utility model is not limited by the purely schematic drawings, in which it should be noted that the drawings are not shown in proportion to the dimensions and are not suitable for defining the proportions of dimensions. It is shown in the drawings:

[0052] Figure 1 A partial cross-section of a transmission is shown;

[0053] Figure 2 Shown according to Figure 1 a partial cross-sectional view of a transmission; and

[0054] Figure 3 A schematic top view of a motor vehicle with a drive train is shown. DETAILED DESCRIPTION

[0055] exist Figure 1 1 shows a detail of a sectional view of a transmission 1 with a transmission housing 7 in the installed position, with the earth's gravitational field 28 being indicated by an arrow oriented vertically in the plane of the paper. In the middle of the schematic diagram, a part of the oil line 9 in the region of the pump device 12 and the collecting conductor 16 can be seen. In the background, the wall of the transmission housing 7 can be seen. The sectional view is in the oil-conducting housing section, with the oil line 9 being sealed relative to the transmission chamber 8.

[0056] In this schematic diagram, the outer gear 22 of the differential 23 (first drive wheel 3) can be seen on the left. On the right, only a small section is visible directly adjacent (see Figure 2 ) An intermediate shaft 24 can be seen, wherein the (second) transmission wheel 4 of the intermediate shaft is engaged with the (first) transmission wheel 3 (i.e. the external gear wheel 22) by means of corresponding toothing. Further to the right, a further (third) transmission wheel 5, for example a gear mechanism 25, can be seen, but the gear mechanism here (purely optional) is not directly engaged with either the first transmission wheel 3 or the second transmission wheel 4. In the background, a fourth transmission wheel 6 can be seen, which belongs to the intermediate shaft 24 of the second transmission wheel 4.

[0057] The leakage opening 11 is arranged laterally (radially offset to the left according to the diagram) from the center 13 of the pump device 12. The transmission oil 10 can enter the transmission chamber 8 through the leakage opening 11, which is indicated here by means of an arrow. The (purely optional) funnel-shaped collecting conductor 16 with a wide collecting opening 17 (according to the diagram above the leakage opening 11) and a significantly narrower oil outlet 18 (according to the diagram below the (second) drive wheel 4) is provided to collect the transmission oil 10 emerging from the leakage opening 11 in as many positions as possible according to the design and to convey it to the oil outlet 18 in a shielded manner relative to the (purely exemplary here three) adjacent drive wheels 3, 5, 6, to be precise passively under the action of gravity.

[0058] Here, a section of the oil distributor 19, here purely optionally made of plastic, can be seen on the left side of the diagram above the external gear 22 of the differential 23. The collecting conductor 16 is connected to the oil distributor in a positive locking manner, preferably fastened to or to the oil distributor.

[0059] exist Figure 2 In Figure 1 The section view of the transmission 1 shown in FIG. Figure 1 Compared to the view from the opposite side), for details refer to the previous description. In the schematic diagram, the external gear 22 of the differential 23 (first transmission wheel 3) can be seen on the right, the second transmission wheel 4 is directly adjacent to the left and the other (third) transmission wheel 5, such as the transmission 25, is further to the left.

[0060] The first transmission wheel 3 here runs in an oil sump 15 of the transmission housing 7. Above the second transmission wheel 4, a collecting conductor 16 can be seen, which is designed to be closed relative to the adjacent larger transmission wheels 3, 5, so that the transmission oil 10 supplied can be passively guided directly to the upper side of the second transmission wheel 4 from above in the partial image.

[0061] A guide device 14 is provided below the second transmission wheel 4 (purely optionally), which is fixed to the transmission housing 7, more precisely to the rear wall 31 of the transmission housing, by means of a force-fitting and form-fitting connection (for example by means of two screws). A guide plane is formed by the guide device 14, the surface normal of which points upward (obliquely) in the opposite direction to the earth's gravitational field 28. The left (upper) end of the extension of the guide device 14 is arranged on the (left) third transmission wheel 5 and the right (lower) end of the extension of the guide device 14 is arranged on the oil pan 15, both of which are close but with a gap. The guide device 14 or its guide plane is inclined downward to the right according to the schematic diagram, more precisely relative to the horizontal plane 32 (see Figure 3 ) has an inclination angle 29 of about 20°.

[0062] exist Figure 3 3 shows a motor vehicle 2 with a drive train 33 in a schematic top view (looking toward a horizontal plane 32). The motor vehicle 2 has a longitudinal axis 34 and an engine axis 35, wherein the engine axis 35 is (purely optionally) arranged transversely to the longitudinal axis 34 in front of a driver's cab 36. The drive train 33 comprises a first drive machine 20 as a torque source, a second (preferably electric) drive machine 21 (for example, in the form of a so-called hybrid module) and a transmission 1 (see Figure 1 ), the first drive machine is preferably implemented as an internal combustion engine 20, the first drive machine has a first machine shaft 37 (here, for example, the internal combustion engine shaft 37), and the second drive machine has a rotor shaft 27. In addition, another (mostly electric) drive machine is usually integrated into the drive train 33, for example, coaxially with the internal combustion engine shaft 37 or parallel thereto.

[0063] Purely optionally, a (actively disengageable) separating clutch is also provided here between the internal combustion engine shaft 37 and the rotor shaft 27. The rotor shaft 27 is connected to the transmission 1 in a torque-transmitting manner (for example by means of a possible further separating clutch, not shown here) via the transmission shaft 26 or the transmission input shaft 38, and the transmission 1 is in turn connected to the left-hand propulsion wheel 39 and the right-hand propulsion wheel 40 in a torque-transmitting manner. By means of the two drive machines 20, 21 or via their machine shafts 37, 27, (traction) torque can be output to the drive train 33 simultaneously or at different times. The propulsion wheels 39, 40 can thus be provided with a (preferably variable) transmission ratio by the drive machines 20, 21. However, it is also possible to absorb (propulsion) torque, for example by means of the internal combustion engine 20 to brake the engine and / or by means of the electric drive machine 21 to recover braking energy.

[0064] Reference numerals list

[0065] 1 Transmission

[0066] 2 Motor Vehicles

[0067] 3 First transmission wheel

[0068] 4 Second transmission wheel

[0069] 5 Third transmission wheel

[0070] 6 Fourth transmission wheel

[0071] 7 Transmission housing

[0072] 8 Transmission Space

[0073] 9 Oil pipeline

[0074] 10 Transmission oil

[0075] 11 Leakage

[0076] 12 Pump device

[0077] 13 Center

[0078] 14 Guidance device

[0079] 15 Oil sump

[0080] 16 Collecting conductors

[0081] 17 Collection Port

[0082] 18 Oil Export

[0083] 19 Oil distributor

[0084] 20 Internal combustion engine

[0085] 21 Electrically driven machinery

[0086] 22 External gear

[0087] 23 Differential

[0088] 24 Intermediate shaft

[0089] 25 Transmission Mechanism

[0090] 26 Transmission shaft

[0091] 27 Rotor shaft

[0092] 28 Earth's Gravity Field

[0093] 29 Tilt Angle

[0094] 30 Parallel lines of the horizontal plane

[0095] 31 Back wall

[0096] 32 Horizontal plane

[0097] 33 Drive system

[0098] 34 Vertical axis

[0099] 35 Engine axis

[0100] 36 Cab

[0101] 37 Internal combustion engine shaft

[0102] 38 Transmission input shaft

[0103] 39 Left propulsion wheel

[0104] 40 Right propulsion wheel

Claims

1. A transmission (1) for a motor vehicle (2), the transmission having at least the following components: - a plurality of transmission wheels (3, 4, 5, 6); - a transmission housing (7) having a transmission space (8), in which at least one transmission wheel of the plurality of transmission wheels (3, 4, 5, 6) is arranged; - an oil pipeline (9) for guiding transmission oil (10) into the transmission housing (7) to lubricate the plurality of transmission wheels (3, 4, 5, 6), It is characterized in that A leakage port (11) is provided in the oil pipeline (9) for allowing the transmission oil (10) to flow out into a transmission space (8) of the transmission housing (7).

2. The transmission (1) according to claim 1, wherein: In the installed position, the leakage opening (11) points downward from the oil line (9) in the transmission chamber (8).

3. The transmission (1) according to claim 2, wherein: The leakage opening (11) is arranged in the region of the pump device (12).

4. The transmission (1) according to claim 3, wherein: The leakage opening (11) is arranged laterally of a center (13) of the pump device (12).

5. A transmission (1) according to any one of the preceding claims, wherein: A guide device (14) for guiding the transmission oil (10) to an oil pan (15) is provided in the transmission space (8).

6. The transmission (1) according to claim 5, wherein: The guide device (14) in the transmission space (8) is arranged in an installed position below a drive wheel (4) of the plurality of drive wheels which is located below the leakage opening (11) in the installed position.

7. The transmission (1) according to claim 6, wherein: A collecting conductor (16) is provided, which has a collecting opening (17) and an oil outlet (18), and is used to guide the transmission oil (10) from the collecting opening (17) to the oil outlet (18) in a directed manner, wherein the collecting conductor (16) is arranged below the leakage opening (11) in the installed position.

8. The transmission (1) according to claim 7, wherein: The guide device (14) in the transmission space (8) is arranged in an installed position below a drive wheel (4) of the plurality of drive wheels which is located below an oil outlet (18) of the collecting conductor (16) in the installed position.

9. The transmission (1) according to claim 8, wherein: The collecting conductor (16) is closed beside at least one adjacent drive wheel of the plurality of drive wheels (3, 5, 6).

10. The transmission (1) according to claim 9, wherein: The collecting conductor (16) extends past the adjacent drive wheel of the plurality of drive wheels (3, 5, 6) at a distance narrower than the distance between the oil outlet of the collecting conductor (16) and the drive wheel (4) arranged further down in the installed position.

11. The transmission (1) according to claim 9, wherein: The busbar conductor (16) is made of plastic.

12. The transmission (1) according to claim 7, wherein: The collecting conductor (16) is connected in a form-fitting manner to an oil distributor (19) for one of the drive wheels (5).

13. The transmission (1) according to claim 12, wherein: The collecting conductor (16) is an integral component of an oil distributor (19) for one of the drive wheels (5).

14. The transmission (1) according to claim 1, wherein: The transmission (1) is a hybrid transmission for an internal combustion engine (20) and an electric drive machine (21).

15. The transmission (1) according to claim 1, wherein: The first transmission wheel (3) among the plurality of transmission wheels is an external gear (22) of a differential (23).

16. The transmission (1) according to claim 15, wherein: Another transmission wheel (4, 6) of the plurality of transmission wheels is arranged on an intermediate shaft (24).

17. The transmission (1) according to claim 16, wherein: The third transmission wheel (5) of the plurality of transmission wheels is assigned to the transmission mechanism (25).

18. The transmission (1) according to claim 1, wherein: A transmission shaft (26) is associated with one of the plurality of transmission wheels, which is oriented coaxially with a rotor shaft (27) of the electric drive machine (21).

19. The transmission (1) according to claim 1, wherein: A transmission shaft (26) is associated with one of the plurality of transmission wheels, which is connected in a rotationally fixed manner to a rotor shaft (27) of an electric drive machine (21) during use.

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