Vehicle transmission

Patent metadata

Field	Value
Publication number	US-12358364-B2
Application number	US-202318103877-A
Country	US
Kind code	B2
Filing date	Jan 31, 2023
Priority date	Feb 1, 2022
Publication date	Jul 15, 2025
Grant date	Jul 15, 2025

Abstract

A vehicle transmission includes a transmission housing defining an oil sump space and a hybrid space, with the hybrid space being arranged vertically above the oil sump space. The transmission further includes a first oil guide shell and a second oil guide shell each fixed to the transmission housing. Additionally, the transmission includes rotating components installable in a portion of the hybrid space between the first oil guide shell and the second oil guide shell in an axial direction, where the rotating components includes at least one electric machine, a damper, and a torsional shock absorber. Two contactless gap seals are formed by one of the oil guide shells and at least one of the rotating components such that oil entry from the oil sump into the portion of the hybrid space is delimited axially by the oil guide shells and radially by the gap seals.

First claim

The invention claimed is:

1. A vehicle transmission ( 1 ), comprising:
a transmission housing ( 2 ) defining an oil sump space ( 3 ) and a hybrid space ( 4 ), the hybrid space ( 4 ) being above the oil sump space ( 3 ) in a vehicle vertical direction (z);
a first oil guide shell ( 19 ) fixed to the transmission housing ( 2 );
a second oil guide shell ( 20 ) fixed to the transmission housing ( 2 ); and
rotating components ( 7 , 10 , 11 ) installable in a portion of the hybrid space ( 4 ) between the first oil guide shell ( 19 ) and the second oil guide shell ( 20 ) in an axial direction (x), the rotating components comprising:
at least one electric machine ( 7 );
a damper ( 10 ); and
a torsional shock absorber ( 11 ),

wherein two contactless gap seals ( 21 , 22 ) are formed by one of the first oil guide shell ( 19 ) or the second oil guide shell ( 20 ) and at least one of the rotating components ( 7 , 10 , 11 ) in the hybrid space ( 4 ), and
wherein an oil entry from the oil sump space ( 3 ) into the portion of the hybrid space ( 4 ) is delimited in the axial direction (x) by the first and second oil guide shells ( 19 , 20 ) and in a radial direction (y) by the two contactless gap seals ( 21 , 22 ).

2. The vehicle transmission of claim 1 , wherein the first oil guide shell ( 19 ) encircles each of the damper ( 10 ), the torsional shock absorber ( 11 ), and an input side of a rotor ( 9 ) of the at least one electric machine ( 7 ) in both the radial direction (y) and in the axial direction (x) to shield the damper ( 10 ), the torsional shock absorber ( 11 ), and the rotor ( 9 ) against oil present in the oil sump space ( 3 ).

3. The vehicle transmission of claim 2 , wherein the first oil guide shell ( 19 ) has a first oil discharge area ( 28 ) and a second oil discharge area ( 29 ), oil being dischargeable from the hybrid space ( 4 ) via the first and second oil discharge areas ( 28 , 29 ), the first oil discharge area ( 28 ) being radially outside of the damper ( 100 ), the second oil discharge area ( 29 ) being directly next to a laminated core of the rotor ( 9 ) in the axial direction (x).

4. The vehicle transmission of claim 3 , wherein the first oil discharge area ( 28 ) of the first oil guide shell ( 19 ) is at an 8 o'clock position with respect to a direction of rotation (R 9 ) of the rotating components ( 9 , 10 , 11 ) and in a circumferential direction of the first oil guide shell ( 19 ), and
wherein the first oil discharge area ( 28 ) defines an oil scraper ( 31 ) that includes a sharp oil-scraping edge ( 32 ).

5. The vehicle transmission of claim 3 , wherein the second oil discharge area ( 29 ) of the first oil guide shell ( 19 ) is at a 1 o'clock position with respect to a direction of rotation (R 9 ) of the rotating components ( 9 , 10 , 11 ) and in a circumferential direction of the first oil guide shell ( 19 ) for de-oiling of an input-side of the rotor ( 9 ), and
wherein the second oil discharge area ( 29 ) defines an oil scraper ( 106 ) that includes a sharp oil-scraping edge ( 107 ), an oil drainage channel ( 100 ) having a U-shaped cross-section opening away from the hybrid space 4 , and an oil drainage wedge ( 62 ) at a 6 o'clock position.

6. The vehicle transmission of claim 3 , further comprising a sensor ring ( 25 ) of the electric machine ( 7 ),
wherein the second oil guide shell ( 20 ) and the sensor ring ( 25 ) define a taper pump ( 34 ), the taper pump ( 34 ) being directly next to an oil discharge area ( 30 ) of the second oil guide shell ( 20 ) in the axial direction (x), the oil discharge area ( 30 ) of the second oil guide shell ( 20 ) being at a 10 o'clock position with respect to a direction of rotation (R 9 ) of the rotating components ( 9 , 10 , 11 ) and in a circumferential direction of the second oil guide shell ( 20 ), the taper pump ( 34 ) being next to an output side of the laminated core of the rotor ( 9 ) in the axial direction (x).

7. The vehicle transmission of claim 6 , wherein the taper pump ( 34 ) is defined by a tapered inner surface ( 45 ) of the second oil guide shell ( 20 ) and a tapered outer surface ( 46 ) of the sensor ring ( 25 ), the tapered outer surface ( 46 ) being parallel to the tapered inner surface ( 45 ).

8. The vehicle transmission of claim 6 , wherein a taper angle (a) of the taper pump ( 34 ) is from 5° to 30°.

9. The vehicle transmission of claim 8 , wherein the taper angle (a) of the taper pump ( 34 ) is 10°.

10. The vehicle transmission of claim 6 , wherein the sensor ring ( 25 ) has a radially outward drawn shoulder ( 51 ) in a radially outer area provided on an output side of the taper pump ( 34 ).

11. The vehicle transmission of claim 6 , wherein a cooling oil return ( 54 ) of a shift element ( 55 ) is connected via an axial de-oiling duct ( 56 ) to a de-oiling opening ( 57 ) in the second oil guide shell ( 20 ), the axial de-oiling duct ( 56 ) branching off from the shift element ( 55 ) at a 6 o'clock position in a circumferential direction of the shift element ( 55 ), and
wherein the shift element ( 55 ) is a friction-locking brake.

12. The vehicle transmission of claim 11 , wherein an inlet ramp ( 67 ) is provided directly adjacent to the de-oiling opening ( 57 ) of the second oil guide shell ( 20 ), the inlet ramp ( 57 ) extending in a rotation direction (R 9 ) of the rotor ( 9 ) and of the sensor ring ( 25 ).

13. The vehicle transmission of claim 12 , wherein oil from the cooling oil return ( 54 ) of the shift element ( 55 ) is guided by the inlet ramp ( 67 ) and by rotation of the sensor ring ( 25 ) toward an oil scraper ( 105 ) of the oil discharge area ( 30 ) of the second oil guide shell ( 20 ) and the taper pump ( 34 ) to output-side windings of a stator ( 8 ) of the at least one electric machine ( 7 ).

14. The vehicle transmission of claim 13 , wherein the oil scraper ( 105 ) of the second oil guide shell ( 20 ) has two oil ejection openings ( 73 , 74 ), each of two oil ejection openings ( 73 , 74 ) including an oil-scraping edge ( 75 , 76 ).

15. The vehicle transmission of claim 6 , wherein a transmission ventilation extends via at least one passage opening ( 101 , 102 ) of the second oil guide shell ( 20 ) defined in an end face of the second oil guide shell ( 20 ) facing the sensor ring ( 25 ).

16. The vehicle transmission of claim 1 , wherein the first oil guide shell ( 19 ) is axially guidable between the transmission housing ( 2 ) and a bearing shield ( 23 ) into a radially centered position in the transmission housing ( 2 ), and
wherein at least one contour offset ( 68 ) defined by the transmission housing ( 2 ) angularly aligns the first oil guide shell ( 19 ) in a circumferential direction with respect to the transmission housing ( 2 ).

17. The vehicle transmission of claim 1 , further comprising a rotor position sensor ( 26 ); and
an elastomeric seal ( 72 ) sealing a gap defined between the second oil guide shell ( 20 ) and the rotor position sensor ( 26 ) in the radial direction.

Assignees

• Zahnradfabrik Friedrichshafen

Inventors

• Riedisser Thomas
• Schmid Wolfgang
• Debernitz Leschek
• Dirheimer Thomas
• Schwaerzler Manuel
• Pöhnlein Florian
• Haase Daniel
• Reinders Peter
• Kibler Martin

Classifications

• F16H57/0452

  Oil pans · CPC title

• B60Y2200/92

  Hybrid vehicles · CPC title

• F16H2057/02043

  for vehicle transmissions · CPC title

• F16H2057/02034

  Gearboxes combined or connected with electric machines · CPC title

• H02K11/21

  Devices for sensing speed or position, or actuated thereby (specially adapted for machines having non-mechanical commutating devices H02K29/06, H02K29/14) · CPC title