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); a transmission housing (4) having a housing section (6) for guiding transmission oil (5) for at least one transmission wheel (3) of the plurality of transmission wheels; an oil distributor (7) for delimiting the at least one transmission wheel (3) and guiding the transmission oil (5) in a housing section (6) guiding the transmission oil (5), the oil distributor (7) having at least one sealing lip (8, 9) with a contact tip (10) for resting on the transmission housing (4), the contact tip (10) having a contact surface (12) for contacting the transmission housing (4); the at least one sealing lip (8) has a radial extension.

Description

Technical Field

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

[0002] In a hybrid transmission (DHT), the bearings and gears are supplied with transmission oil via the differential from an oil pan that is located lower under normal driving conditions. In the vicinity of the differential, the oil distributor axially abuts against the inner wall of the transmission housing with the aid of a sealing lip to surround the differential and to be able to deliver the transmission oil from the oil pan to the location to be supplied. More specifically, the sealing lip seals the oil delivery area by its abutment against the inner wall of the transmission housing, so that the transmission oil can be delivered from the oil pan to the supply location by the rotational movement of the differential. 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 oil-carrying housing section for at least one transmission wheel;

[0007] an oil distributor for delimiting at least one transmission wheel and for guiding the transmission oil in a housing section guiding the transmission oil,

[0008] The oil distributor has at least one sealing lip with a contact tip for contacting the transmission housing,

[0009] At least one of the sealing lips has a radial extension.

[0010] 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 be present.

[0011] According to a first aspect, the invention relates to a hybrid transmission having an oil distributor with axially and radially sealing sealing lips.

[0012] In order to make optimal use of the available construction space or, if necessary, to be able to use a differential with a larger outer diameter, it is proposed that the sealing lip of the oil distributor realizes a radial and axial seal. This realization makes it possible to compensate for tolerances that occur and improve the elastic properties with regard to the elongation at break of the used material. For this purpose, the sealing lip does not rest axially but radially on the inner wall of the transmission housing and has a radial extension for this purpose. This results in construction space for the associated drive wheels. 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, the oil distributor is a component that is at least functionally conventional. The transmission oil that splashes due to the rotation of the wetted drive wheel is collected by the oil distributor and drained away in a targeted manner, for example, to an oil sump in an oil-conducting housing section.

[0017] An oil distributor is assigned to at least one transmission wheel, wherein the rotation axis of the associated transmission wheel is used as a reference for the oil distributor. In one embodiment, the oil distributor is designed as an annular component which completely or partially surrounds the rotation axis of the corresponding transmission wheel, wherein the oil distributor is designed radially outwardly close to or in contact with the transmission housing.

[0018] In one embodiment, the oil distributor has a plurality of sealing lips. In one embodiment, the oil distributor has at least one sealing lip with an axial extension, wherein a further sealing lip extends from a part of a core of the oil distributor in the form of a web axially outwardly away from the core, specifically towards a wall of the transmission housing.

[0019] In one embodiment, at least one further sealing lip is a redundant seal which is connected downstream of the first sealing lip in the outflow direction or the discharge direction.

[0020] The first sealing lip has a radial extension, wherein the sealing lip extends from a part of a core of the oil distributor in the form of a web radially outwards away from the core, specifically towards a wall of the transmission housing.

[0021] The installation position corresponds to a position in the earth's gravitational field, in which the motor vehicle stands unloaded (stationary) on an upright surface, ie, for example, on a road surface without an inclination.

[0022] In one embodiment, the mounting position has an angular tolerance relative to this horizontal plane, which may be up to 1° (angle of 360°).

[0023] According to another aspect, a transmission for a motor vehicle is proposed, the transmission having at least the following components:

[0024] -Multiple transmission wheels;

[0025] a transmission housing having a transmission oil-carrying housing section for at least one transmission wheel;

[0026] an oil distributor for lubricating at least one transmission wheel in a housing section conducting transmission oil,

[0027] The oil distributor has at least one sealing lip with a contact tip for contacting the transmission housing,

[0028] At least one of the sealing lips is bent at its contact tip relative to a main extension of the at least one sealing lip.

[0029] The transmission proposed here is constructed as described above, wherein in an optional embodiment, the radially extending sealing lip is replaced by the sealing lip with a bent contact tip described here. Alternatively, this is the same sealing lip. In one embodiment, the axially extending sealing lip is alternatively or additionally implemented with a bent contact tip.

[0030] In order to effectively utilize the available installation space, the cross-sectional shape of the sealing lip is designed as a bend. This allows for installation positions with tolerances, since stiffness is achieved by bending the contact tip relative to the main extension while maintaining the same (i.e. conventional) material. At the same time, the contact force required for the desired tightness of the sealing lip is reliably achieved. Thus, for example, conventional materials can be used for oil distributors.

[0031] Furthermore, in an advantageous embodiment of the transmission it is provided that the transmission is designed according to one of the embodiments described above.

[0032] Furthermore, in an advantageous embodiment of the transmission it is provided that the contact tip points obliquely away from the directly adjacent drive wheel.

[0033] In one embodiment, the extension of the sealing lip runs parallel to the radial extension of the associated drive wheel.

[0034] Furthermore, in an advantageous embodiment of the transmission it is provided that the contact tip points obliquely away from the transmission oil-conducting housing section.

[0035] In one specific embodiment, the extension of the sealing lip runs parallel to the radial extension of the oil-conducting housing section.

[0036] Furthermore, in an advantageous embodiment of the transmission it is provided that the oil distributor has at least one engagement device for a geometrically specific engagement in the transmission housing.

[0037] In one embodiment, the mating device is inserted into a corresponding hole in the transmission housing. In one embodiment, the mating device is inserted into a recess between at least one rib and / or at least one web and / or at least one outer wall of the transmission housing.

[0038] Furthermore, in an advantageous embodiment of the transmission, it is provided that at least one sealing lip is formed in the housing section conducting the transmission oil on a delimited circumferential section in the circumferential direction of the drive wheel.

[0039] In one embodiment, at least one sealing lip is formed or arranged between two ribs and / or webs of the transmission housing. In one embodiment, at least one sealing lip is formed on a circumferential section of more than 90° (ninety degrees of 360°), preferably more than 180°, particularly preferably less than 270°. In one embodiment, at least one sealing lip overlaps the oil pan in the oil-conducting housing section at least completely. In one embodiment, at least one sealing lip is arranged in the oil pan, i.e., in the circumference outside the oil pan in the oil-conducting housing section.

[0040] Furthermore, in an advantageous embodiment of the transmission it is provided that the oil distributor is provided for conducting the transmission oil from the oil inlet opening.

[0041] In one embodiment, an oil inlet is provided for supplying transmission oil from a supply system. The oil inlet is connected to the supply system, for example, via an oil line, so that transmission oil can be supplied from the outside to the transmission housing. In one embodiment, the oil inlet is connected to a (separate) pump, by which transmission oil can be supplied to the transmission housing as required (for example, a so-called intelligent hydraulic actuator).

[0042] In one embodiment, the oil distributor comprises a collecting line. In one embodiment, the collecting line is a separate component which can be mechanically connected to the oil distributor or connected in an installation location. In one embodiment, the collecting line is an integral component of the oil distributor.

[0043] Furthermore, in an advantageous embodiment of the transmission it is provided that the oil distributor is arranged at a distance from the cover of the differential to form an oil channel.

[0044] Furthermore, in an advantageous embodiment of the transmission it is provided that the oil distributor is formed from plastic.

[0045] In one embodiment, the plastic is a cast thermoplastic.

[0046] Furthermore, in an advantageous embodiment of the transmission it is provided that the plastic is polyamide.

[0047] In one embodiment the polyamide is PA66.

[0048] Furthermore, in an advantageous embodiment of the transmission it is provided that the oil distributor is connected to the transmission housing in a friction-locking manner.

[0049] In one specific embodiment, the guide device is screwed to the transmission housing, riveted and / or fastened by means of a draw bolt.

[0050] Furthermore, in an advantageous embodiment of the transmission it is provided that the oil distributor is connected to the transmission housing in a form-fitting manner.

[0051] In one specific embodiment, the guide device is screwed, snapped, snapped, riveted and / or fastened to the transmission housing by means of bolts.

[0052] 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.

[0053] In one specific embodiment, the hybrid transmission is a so-called DHT (English: Dedicated Hybrid Transmission).

[0054] Furthermore, in an advantageous embodiment of the transmission it is provided that the drive wheel in the housing section conducting the transmission oil is an external gear wheel of the differential.

[0055] Furthermore, in an advantageous embodiment of the transmission it is provided that the gear mechanism is arranged in a transmission housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] 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:

[0057] Figure 1 A partial longitudinal section of the differential is shown in the housing section that conducts the transmission oil;

[0058] Figure 2 Shown according to Figure 1 A partial cross section of the differential before the oil distributor;

[0059] Figure 3 shows a partial view of an oil distributor having a radial sealing lip; and

[0060] Figure 4 A schematic top view of a motor vehicle with a drive train is shown. DETAILED DESCRIPTION

[0061] exist Figure 1 5 shows a partial longitudinal section of a differential 19 in a housing section 6 that conducts transmission oil 5. The (purely optional) bevel gear 26 of the differential 19, which is designed as a bevel gear differential, can be seen at the top of the figure. The (purely optional) external gear 22 (drive wheel 3) of the differential 19 can be seen at the bottom in the schematic diagram. The external gear runs in the housing section 6 that conducts oil via an oil pan 24. The housing section 6 that conducts oil is delimited on the axial side (here on the left side according to the schematic diagram) by an oil distributor 7. The oil distributor 7 is arranged in a complementary matching receptacle 25 in the outer wall 28 of the transmission housing 4 by means of a matching device 12 and is oriented thereby. According to the schematic diagram, a sealing lip 9 with an axial extension is provided at the bottom, i.e. radially further outwards, and the sealing lip 9 rests sealingly on the outer wall 28 (of the first housing half 27) of the transmission housing 4. A sealing lip 8 with a radial extension is arranged adjacent to the housing section 6 that conducts oil and thus delimits it. The radial sealing lip 8 also rests (with its contact tip 10) on the outer wall 28 (here of the other housing half 29). Here, the contact tip 10 (as usual) strikes the relevant outer wall 28 and is correspondingly elastically deformed in actual use in order to thereby generate the desired contact force. The two sealing lips 8, 9 extend in their respective directions from the core 30 of the oil distributor 7.

[0062] An oil channel 16 is formed by means of a distance 17 between the oil distributor 7 and the cover 18 of the differential 19, through which transmission oil 5 that has leaked elsewhere and splashed around due to the rotation of the drive wheel 3 can be returned to the external gear 22, i.e., can be supplied or returned passively by gravity during operation.

[0063] The radial sealing lip 8 also has a contact tip 10 which is angled relative to the radial extension, ie the main extension 11 of the radial sealing lip 8. Here (purely optionally) the contact tip 10 is angled away from the oil-conducting housing section 6 or the external gear wheel 22.

[0064] exist Figure 2 It is shown in Figure 1 A partial cross section of the differential 19 before the oil distributor 7 or looking towards the side of the housing section 6 that guides the oil. That is, looking at the plane in which the circumferential direction 13 around the axis of rotation of the external gear 22 lies. It can be seen here that the radial sealing lip 8 is not completely circumferential. Instead, an end can be seen in the area of ​​the oil pan 24 (under the earth's gravitational field 31 in the transmission housing 4), so that the external gearing 22 of the differential 19 can be seen in this schematic diagram. The oil distributor 7 also ends at the top, and the oil distributor extends at a rotation angle of approximately greater than 180° here. The radial sealing lip 8 of the embodiment with the angled contact tip 10 is, for example, also only arranged on a partial section of the entire circumferential extension of the oil distributor 7, that is, the circumferential section 14, for example here in the marked angular area or alternatively all the parts where the radial sealing lip 8 touches the outer wall 28 of the transmission housing 4.

[0065] exist Figure 3 7 shows a detail of an oil distributor 7 having a radial sealing lip 8, which can be installed, for example, according to Figure 1 and Figure 2 The transmission housing 4 is provided in this regard with reference to the above description. The angled contact tip 10 can be clearly seen here. The radial load for the desired pressing force of the contact tip 10 therefore does not cause a buckling load on the radial sealing lip 8, but only causes a reduction in the surrounding bending angle. The forces or resulting deformations can therefore be well absorbed under defined sealing contact and difficult tolerance conditions. It should be noted that in one embodiment, the axial sealing lip 9 has only one such angled contact tip 10.

[0066] exist Figure 4 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. The transmission 1 is implemented as a transmission mechanism 23, for example.

[0067] Purely optionally, a (actively disengageable) separating clutch is also provided here between the internal combustion engine shaft 37 and the rotor shaft 38. The rotor shaft 38 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 42 or the transmission input shaft 39, and the transmission 1 is in turn connected to the left-hand propulsion wheel 40 and the right-hand propulsion wheel 41 in a torque-transmitting manner. By means of the two drive machines 20, 21 or via their machine shafts 37, 38, (traction) torque can be output to the drive train 33 simultaneously or at different times. The propulsion wheels 40, 41 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.

[0068] Reference numerals list

[0069] 1 Transmission

[0070] 2 Motor Vehicles

[0071] 3 Drive wheel

[0072] 4 Transmission housing

[0073] 5 Transmission oil

[0074] 6 Oil-conducting housing section

[0075] 7 Oil distributor

[0076] 8 Radial sealing lip

[0077] 9 Axial sealing lip

[0078] 10 Contact tip

[0079] 11 Main extension

[0080] 12 Coordination device

[0081] 13 Surround direction

[0082] 14 Surround Sections

[0083] 15 Oil inlet

[0084] 16 Oil channel

[0085] 17 Spacing

[0086] 18 Differential cover

[0087] 19 Differential

[0088] 20 Internal combustion engine

[0089] 21 Electrically driven machinery

[0090] 22 External gear

[0091] 23 Transmission mechanism

[0092] 24 Oil sump

[0093] 25 Matching accommodation portion

[0094] 26 Bevel gear

[0095] 27 First housing half

[0096] 28 outer wall

[0097] 29 Second shell half

[0098] 30 Core

[0099] 31 Earth's Gravity Field

[0100] 32 Horizontal plane

[0101] 33 Drive system

[0102] 34 Vertical axis

[0103] 35 Engine axis

[0104] 36 Cab

[0105] 37 Internal combustion engine shaft

[0106] 38 Rotor shaft

[0107] 39 Transmission input shaft

[0108] 40 Left propulsion wheel

[0109] 41 Right propulsion wheel

[0110] 42 Transmission shaft

Claims

1. A transmission (1) for a motor vehicle (2), the transmission having at least the following components: - a plurality of transmission wheels (3); a transmission housing (4) having a housing section (6) for guiding transmission oil (5) for at least one transmission wheel (3) of the plurality of transmission wheels; an oil distributor (7) for delimiting the at least one transmission wheel (3) and for guiding the transmission oil (5) in a housing section (6) guiding the transmission oil (5), It is characterized in that The oil distributor (7) has at least one sealing lip (8, 9) having a contact tip (10) for contacting the transmission housing (4). Therein, the at least one sealing lip (8) has a radial extension.

2. A transmission (1) for a motor vehicle (2), the transmission having at least the following components: - a plurality of transmission wheels (3); a transmission housing (4) having a housing section (6) for guiding transmission oil (5) for at least one transmission wheel (3) of the plurality of transmission wheels; an oil distributor (7) for lubricating the at least one transmission wheel (3) in a housing section (6) conducting transmission oil (5), It is characterized in that The oil distributor (7) has at least one sealing lip (8, 9) having a contact tip (10) for contacting the transmission housing (4). Therein, the at least one sealing lip (8) is bent at the contact tip (10) relative to a main extension (11) of the at least one sealing lip.

3. A transmission (1), characterized in that: The transmission is a transmission according to claim 1 or 2.

4. The transmission (1) according to claim 3, wherein: The contact tip (10) points in a direction obliquely away from a drive wheel (3) directly adjacent thereto among the plurality of drive wheels.

5. The transmission (1) according to claim 3, wherein: The contact tip (10) points in a direction obliquely away from a housing section (6) that conducts the transmission oil (5).

6. The transmission (1) according to claim 3, wherein: The oil distributor (7) has at least one engagement device (12) for geometrically specific engagement in the transmission housing (4).

7. The transmission (1) according to claim 3, wherein: The at least one sealing lip (8) is formed in a housing section (6) that conducts the transmission oil (5) on a delimiting circumferential section (14) along a circumferential direction (13) of the drive wheel (3).

8. The transmission (1) according to claim 3, wherein: The oil distributor (7) is provided for guiding the transmission oil (5) from an oil inlet opening (15).

9. The transmission (1) according to claim 3, wherein: The oil distributor (7) is arranged at a distance (17) from a cover (18) of a differential (19) to form an oil channel (16).

10. The transmission (1) according to claim 3, wherein: The oil distributor (7) is formed from plastic.

11. The transmission (1) according to claim 10, wherein: The plastic is polyamide.

12. The transmission (1) according to claim 3, wherein: The oil distributor (7) is connected to the transmission housing (4) in a force-fitting manner.

13. The transmission (1) according to claim 3, wherein: The oil distributor (7) is connected to the transmission housing (4) in a form-fitting manner.

14. The transmission (1) according to claim 3, 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 3, wherein: The drive wheel (3) in the housing section (6) that conducts the transmission oil (5) is an external gear wheel (22) of the differential (19).

16. The transmission (1) according to claim 3, wherein: The transmission mechanism (23) is arranged in the transmission housing (4).

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