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); a transmission housing (6) having an oil pan (7); an oil inlet (8) for lubricating the plurality of driving wheels (3, 4, 5), the guide device (9) being located below one of the driving wheels (4) with a guide plane (10) in the installed position, the guide plane (10) being used for guiding transmission oil (11) towards the oil pan (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 with an oil sump;

[0007] - oil inlet for lubricating the transmission wheel,

[0008] In this case, the guide device is located with a guide plane below one of the transmission wheels in the installed position, wherein the guide plane serves to guide the transmission oil toward the oil pan.

[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 guiding ramp for providing oil guiding in an inclined position.

[0011] In order to solve the aforementioned problem of interrupted oil supply or at least alleviate the problem or limit it to a few extreme cases, a guide device is proposed, which is implemented, for example, as an oil guide ramp made of plastic, which is integrated into the hybrid transmission. In one embodiment, the guide device supplies the transmission oil from an active pump, in particular from a so-called intelligent hydraulic system. The transmission oil splashing around is collected at the guide device and conveyed passively (i.e. under the action of gravity) in the direction of the oil pan and the direction of the relevant transmission wheel (such as the differential). The relevant transmission wheel then conveys the input transmission oil again in the direction of the bearing and / or the gear. The guide device is positioned or designed in the transmission so as to ensure supply up to an inclined position of, for example, up to 20° or more. Suitable or advantageous embodiments are mentioned below for this purpose.

[0012] 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.

[0013] 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.

[0014] In one embodiment, the mounting position has an angular tolerance relative to this horizontal plane, which may be up to 1° (360° angle).

[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, the oil inlet is an opening in the transmission housing, through which transmission oil can be fed from the outside. In one embodiment, the oil inlet is a connection for an outlet of a pump, through which transmission oil can be fed into the transmission housing. In one embodiment, the oil inlet is arranged in the transmission housing so that the transmission oil flows passively to the oil pan in the installed position. In one embodiment, the oil inlet is arranged in the transmission housing so that the transmission oil passively wets the toothing and / or the bearing gap or the rolling elements of at least one of the transmission wheels in the installed position.

[0017] Furthermore, in an advantageous embodiment of the transmission, it is provided that one of the drive wheels is arranged to run through the oil sump, or at least partially through the oil sump.

[0018] Furthermore, in an advantageous embodiment of the transmission it is provided that the drive wheel in the guide device meshes with a drive wheel passing through the oil sump.

[0019] Furthermore, in an advantageous embodiment of the transmission it is provided that the guide plane of the guide device has, on the drive wheel located above it, a depression adapted to the drive wheel.

[0020] In one embodiment, the running direction of the transmission wheel located above the guide plane is opposite to the passive flow direction of the transmission oil on the guide plane. In this embodiment, a large distance is preferably formed so that the transmission oil on the guide plane can flow past the relevant transmission wheel without contact in the case of normal or, depending on the design, maximum oil input and in extreme acceleration and / or tilting positions.

[0021] Furthermore, in an advantageous embodiment of the transmission it is provided that the guide plane of the guide device has a rounded depression on the drive wheel located above it.

[0022] In one embodiment, a uniform spacing is preferably formed with respect to a drive wheel (e.g., rotating in the opposite direction) located above the guide plane, so that in the case of a normal or, depending on the design, maximum oil input and in extreme accelerations and / or tilting positions, the transmission oil on the guide plane can flow past the relevant drive wheel with low resistance.

[0023] Furthermore, in an advantageous embodiment of the transmission it is provided that the guide plane of the guide device adjoins one of the drive wheels with clearance at the end of its extension facing away from the oil sump.

[0024] Furthermore, in an advantageous embodiment of the transmission it is provided that the guide device has a collecting wall which extends upward in the installed position.

[0025] The collecting wall is used, for example, for downhill driving of the relevant motor vehicle or for braking pitching, so that interruptions in the fuel supply or fuel shut-offs can be prevented or at least significantly reduced. It should be noted that in one embodiment the collecting wall is used for the purpose of uphill driving or acceleration pitching of the relevant motor vehicle. It should also be noted that in one embodiment the collecting wall is used for the purpose of lateral acceleration or rolling pitching of the relevant motor vehicle. This depends on the type of installation of the transmission, for example in the axial extension of an internal combustion engine oriented parallel to the main driving direction or an internal combustion engine oriented transversely to the main driving direction.

[0026] Furthermore, in an advantageous embodiment of the transmission it is provided that the upwardly extending collecting wall is oriented obliquely at an angle of 90° or less relative to the guide plane.

[0027] Furthermore, in an advantageous embodiment of the transmission it is provided that the collecting wall has a recess on the drive wheel arranged above it.

[0028] In one embodiment, the collecting wall is designed to overlap axially with the drive wheel arranged above it and has on one side or on both sides (ie radially relative to the axis of the respective drive wheel) an elevation compared to the lowest point in the overlapping region.

[0029] Furthermore, in an advantageous embodiment of the transmission it is provided that the guide plane is oriented inclined in the axial direction relative to the horizontal in the earth's gravitational field in the installed position.

[0030] Furthermore, in an advantageous embodiment of the transmission it is provided that the guide plane in the installed position is oriented so as to be lowered in the axial direction towards the collecting wall relative to the horizontal plane in the earth's gravitational field.

[0031] In one embodiment, the running channel is formed in the collecting wall by means of the collecting wall and the downwardly descending guide surface together.

[0032] Furthermore, in an advantageous embodiment of the transmission it is provided that the collecting wall extends uninterruptedly along the guide plane.

[0033] It should be pointed out that in one embodiment with the aforementioned recess, a (here lower) collecting wall is therefore present in the region of the associated drive wheel.

[0034] Furthermore, in an advantageous embodiment of the transmission it is provided that in the installed position the guide plane of the guide device has an inclination angle of greater than 15° relative to the horizontal plane towards the oil sump.

[0035] In an advantageous embodiment, in the installed position, the guide plane of the guide device has an inclination angle of equal to or greater than 20° relative to the horizontal toward the oil sump.

[0036] Furthermore, in an advantageous embodiment of the transmission it is provided that in the installed position the guide plane of the guide device has an inclination angle of less than 30° relative to the horizontal plane towards the oil sump.

[0037] In an advantageous embodiment, in the installed position, the guide plane of the guide device has an inclination angle of equal to or less than 25° relative to the horizontal toward the oil sump.

[0038] Furthermore, in an advantageous embodiment of the transmission it is provided that the guide device is made of plastic.

[0039] In one embodiment the plastic is a polyamide, such as PA66.

[0040] Furthermore, in an advantageous embodiment of the transmission it is provided that the guide device is connected to the transmission housing in a friction-locking and form-locking manner.

[0041] In one specific embodiment, the guide device is screwed, snapped, snapped, riveted and / or fastened to the transmission housing by means of bolts.

[0042] Furthermore, in an advantageous embodiment of the transmission it is provided that the guide device has at least one recess with play for a rib and / or a web of the transmission housing.

[0043] 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.

[0044] In one specific embodiment, the hybrid transmission is a so-called DHT (English: Dedicated Hybrid Transmission).

[0045] Furthermore, in an advantageous embodiment of the transmission it is provided that a first of the transmission gears is an external gear of the differential.

[0046] Furthermore, in an advantageous embodiment of the transmission it is provided that a second of the transmission gears is arranged on the intermediate shaft.

[0047] 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.

[0048] Furthermore, in an advantageous embodiment of the transmission it is provided that a third of the transmission wheels is assigned to the gear mechanism.

[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 is oriented coaxially to a rotor shaft of the electric drive machine.

[0050] 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.

[0051] 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.

[0052] 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

[0053] 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:

[0054] Figure 1 A partial cross-sectional view of a transmission is shown;

[0055] Figure 2 A perspective view showing a guide device with a collecting wall; and

[0056] Figure 3 A schematic top view of a motor vehicle with a drive train is shown. DETAILED DESCRIPTION

[0057] exist Figure 1 1 shows a detail of a sectional view of a transmission 1 with a transmission housing 6 in the installed position, which is indicated by an arrow oriented vertically in the plane of the paper, which is used to represent the earth's gravitational field 18. In this schematic diagram, the external gear 25 (first transmission wheel 3) of the differential 26 can be seen on the right. On the left, the intermediate shaft 27 can be seen directly adjacent, wherein the (second) transmission wheel 4 of the intermediate shaft is engaged with the (first) transmission wheel 3 (i.e. the external gear 25) by means of corresponding toothing. Further to the left, another (third) transmission wheel 5, for example a transmission 28, can be seen, but the transmission here (purely optionally) is neither directly engaged with the first transmission wheel 3 nor with the second transmission wheel 4.

[0058] The first transmission wheel 3 here rotates in an oil sump 7 of a transmission housing 6. Above the second transmission wheel 4, an oil inlet 8 can be seen, which in this case in a (purely optional) embodiment is designed as a collecting conductor, which is designed to be closed relative to the adjacent larger transmission wheels 3, 5, so that the transmission oil 11 fed in can be passively guided directly from above the image section to the upper side of the second transmission wheel 4.

[0059] Below the second transmission wheel 4, a guide device 9 is provided (as seen from the front), which is fixed here by a friction fit and a positive fit (for example by means of two screws 32) to the transmission housing 6, more precisely to the rear wall 31 of the transmission housing 6. The guide device 9 forms a guide plane 10, the surface normal of which points upward (obliquely) in the opposite direction to the earth's gravitational field 18. The left (upper) end 14 of the extension of the guide plane 10 is arranged on the (left) third transmission wheel 5 and the right (lower) end 13 of the extension of the guide plane 10 is arranged on the oil pan 7, close to each other but with a gap. Below the second transmission wheel 4, the guide plane 10 has a depression 12 that is matched to the transmission wheel and is rounded here, so that the spacing between the second transmission wheels 4 (for example, which rotate clockwise, i.e. in the opposite direction in use) is large enough to ensure a smooth flow of the transmission oil 11 from the upper end 14 to the lower end 13. The guide plane 10 is inclined from the upper end 14 to the lower end 13 (and as a secant intersecting the recess 16), i.e. preferably tangentially to the second drive wheel 4 or parallel to its tangent, descending to the right according to the diagram, more specifically relative to the horizontal plane 17 (see Figure 3 ) has an inclination angle 19 of about 20°.

[0060] The guide device 9 shown is designed without a collecting wall 15 (see Figure 2 ) or the collecting wall is cut away in this cross-sectional view and therefore cannot be seen.

[0061] It should be pointed out that the rear wall 31 of the transmission housing 6 has a plurality of ribs 21 and webs 22 , so that a flat contact surface on the side of the guide plane 10 facing the rear wall 31 could result in a clearance that is too great for some applications.

[0062] exist Figure 2 1 shows a perspective view of a guide device 9 with a collecting wall 15 in a rearward view. For example, such a guide device 9 is in an installed position, such as in Figure 1 The arrangement is shown in FIG. 1 , so that general reference to the description of the conditions at the installation site is not excluded here.

[0063] The guide plane 10 also has a rounded depression 12. Below the guide plane 10, through holes 34 for a force-locking and form-locking connection (e.g., by means of screws 32) with the transmission housing 6 can be seen. On the rear outer side of the guide plane 10 of the guide device 9, an upwardly pointing collecting wall 15 can be seen. The collecting wall 15 shown here is inclined at an angle of approximately 90° to the guide plane 10, wherein preferably (as can be clearly seen here at the front (upper) end 14 in the schematic diagram) the guide plane 10 is oriented downwardly in the axial direction toward the collecting wall 15 in the installed position relative to the horizontal plane 17 in the earth's gravitational field 18.

[0064] Purely optionally, the collecting wall 15 has a recess 16 in the depression 12 of the guide plane 10, which is also rounded here for the adjacent (according to Figure 1 Second) the recess of the drive wheel 4. At the same time, however, the collecting wall 15 is guided uninterruptedly between the two ends 13, 14 of the guide plane 10 and is continuous even at the recess 16, even though it is significantly lower there. In this area, it is advantageous to narrow the adjacent drive wheel 4 in order to prevent the transmission oil 11 from flowing beyond the guide plane 10 at the outflow (from front to rear).

[0065] In the schematic diagram, a plurality of ribs 21 or webs 22 are provided on the side of the rear wall 31 of the transmission housing 6 at the front side facing the rear wall 31 at the installation site (see FIG. Figure 1 ) of the recessed portion 20. This side can thus be arranged close to the rear wall 31 and limit the gap to the required play.

[0066] The guide device 9 shown, for example, is designed as a (preferably one-piece) cast component made of a thermoplastic, for example PA66.

[0067] exist Figure 3 1 shows a motor vehicle 2 with a drive train 35 in a schematic top view (looking toward a horizontal plane 17). The motor vehicle 2 has a longitudinal axis 36 and an engine axis 37, wherein the engine axis 37 is (purely optionally) arranged transversely to the longitudinal axis 36 in front of a driver's cab 38. The drive train 35 comprises a first drive machine 23 as a torque source, a second (preferably electric) drive machine 24 (for example, in the form of a so-called hybrid module) and a transmission 1 (see Figure 1 ), the first drive machine is preferably designed as an internal combustion engine 23, the first drive machine has a first machine shaft 39 (here, for example, the internal combustion engine shaft 39), and the second drive machine has a rotor shaft 30. In addition, a further (mostly electric) drive machine is usually integrated into the drive train 33, for example, coaxially with the internal combustion engine shaft 39 or parallel thereto.

[0068] Purely optionally, a (actively disengageable) separating clutch is also provided here between the internal combustion engine shaft 39 and the rotor shaft 30. The rotor shaft 30 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 29 or the transmission input shaft 40, and the transmission 1 is in turn connected to the left-hand propulsion wheel 41 and the right-hand propulsion wheel 42 in a torque-transmitting manner. By means of the two drive machines 23, 24 or via their machine shafts 39, 30, a (traction) torque can be output to the drive train 35 simultaneously or at different times. The propulsion wheels 41, 42 can thus be provided with a (preferably variable) transmission ratio by the drive machines 23, 24. However, it is also possible to absorb (propulsion) torque, for example, by means of the internal combustion engine 23 to brake the engine and / or by means of the electric drive machine 24 to recover braking energy.

[0069] Reference numerals list

[0070] 1 Transmission

[0071] 2 Motor Vehicles

[0072] 3 First transmission wheel

[0073] 4 Second transmission wheel

[0074] 5 Third transmission wheel

[0075] 6 Transmission housing

[0076] 7 Oil sump

[0077] 8 Oil input

[0078] 9 Guidance device

[0079] 10 Guiding plane

[0080] 11 Transmission oil

[0081] 12. Sedimentation

[0082] 13 Lower end

[0083] 14 Top

[0084] 15 Collection Wall

[0085] 16 recess

[0086] 17 Horizontal plane

[0087] 18 Earth's Gravity Field

[0088] 19 Tilt Angle

[0089] 20 Retraction

[0090] 21 Rib

[0091] 22 Splice

[0092] 23 Internal combustion engine

[0093] 24 Electrical drive machinery

[0094] 25 External gear

[0095] 26 Differential

[0096] 27 Intermediate shaft

[0097] 28 Transmission mechanism

[0098] 29 Transmission shaft

[0099] 30 Rotor shaft

[0100] 31 Back wall

[0101] 32 Screws

[0102] 33 Parallel lines of the horizontal plane

[0103] 34 Through Holes

[0104] 35 Drive system

[0105] 36 Vertical axis

[0106] 37 Engine axis

[0107] 38 Cab

[0108] 39 Internal combustion engine shaft

[0109] 40 Transmission input shaft

[0110] 41 Left propulsion wheel

[0111] 42 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); - a transmission housing (6) having an oil sump (7); - an oil input (8) for lubricating the plurality of transmission wheels (3, 4, 5), in, In the installed position, the guide device (9) is located with a guide plane (10) below one of the transmission wheels (4), wherein the guide plane (10) serves to guide the transmission oil (11) toward the oil pan (7).

2. The transmission (1) according to claim 1, wherein: One of the transmission wheels (3) is arranged to be able to pass through the oil sump (7).

3. The transmission (1) according to claim 2, wherein: The transmission wheel (4) in the guide device (9) meshes with the transmission wheel (3) passing through the oil pan (7).

4. The transmission (1) according to claim 3, wherein: The guide plane (10) of the guide device (9) has a depression (12) matching the transmission wheel at the transmission wheel (4) located above the guide plane (10).

5. The transmission (1) according to claim 3, wherein: The guide plane (10) of the guide device (9) has a rounded depression (12) on the drive wheel (4) located above the guide plane.

6. The transmission (1) according to claim 3, wherein: The guide plane (10) of the guide device (9) adjoins one of the drive wheels (5) with clearance at its end (14) of extension facing away from the oil sump (7).

7. A transmission (1) according to any one of the preceding claims, wherein: The guide device (9) has a collecting wall (15) which extends upward in the installed position.

8. The transmission (1) according to claim 7, wherein: The upwardly extending collecting wall (15) is oriented obliquely at an angle of 90° or less relative to the guide plane (10).

9. The transmission (1) according to claim 7, wherein: The collecting wall (15) has a recess (16) on the drive wheel (4) arranged above the collecting wall.

10. The transmission (1) according to claim 7, wherein: The guide plane (10) is oriented in an installed position obliquely in the axial direction relative to a horizontal plane (17) in the earth's gravitational field (18).

11. The transmission (1) according to claim 10, wherein: In the installed position, the guide plane (10) is oriented downwardly in the axial direction toward the collecting wall (15) relative to the horizontal plane (17) in the earth's gravitational field (18).

12. The transmission (1) according to claim 10, wherein: The collecting wall (15) extends uninterruptedly along the guide plane (10).

13. The transmission (1) according to claim 1, wherein: In the installed position, the guide plane (10) of the guide device (9) has an inclination angle (19) of greater than 15° relative to a horizontal plane (17) toward the oil sump (7).

14. The transmission (1) according to claim 1, wherein: In the installed position, the guide plane (10) of the guide device (9) has an inclination angle (19) of less than 30° relative to a horizontal plane (17) toward the oil sump (7).

15. The transmission (1) according to claim 1, wherein: The guide device (9) is made of plastic.

16. The transmission (1) according to claim 1, wherein: The guide device (9) is connected to the transmission housing (6) in a force-fitting and form-fitting manner.

17. The transmission (1) according to claim 1, wherein: The guide device (9) has at least one recess (20) with play for a rib (21) and / or a web (22) of the transmission housing (6).

18. The transmission (1) according to claim 1, wherein: The transmission (1) is a hybrid transmission for an internal combustion engine (23) and an electric drive machine (24).

19. The transmission (1) according to claim 1, wherein: The first transmission wheel (3) among the plurality of transmission wheels is an external gear (25) of a differential (26).

20. The transmission (1) according to claim 19, wherein: The second transmission wheel (4) of the plurality of transmission wheels is arranged on an intermediate shaft (27).

21. The transmission (1) according to claim 20, wherein: A third transmission wheel (5) among the plurality of transmission wheels is assigned to a transmission mechanism (28).

22. The transmission (1) according to claim 1, wherein: One of the drive wheels (3, 5) is assigned to a transmission shaft (29) which is oriented coaxially with a rotor shaft (30) of an electric drive machine (24).

23. The transmission (1) according to claim 1, wherein: One of the drive wheels (5) is associated with a transmission shaft (29) which, during use, is connected in a rotationally fixed manner to a rotor shaft (30) of an electric drive machine (24).

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