Drive train for a hybrid vehicle

• US 7,244,208 B2
• Filed: 09/23/2004
• Issued: 07/17/2007
• Est. Priority Date: 10/08/2003
• Status: Active Grant

• Current Assignee: ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Original Assignee: ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Inventors: Bauknecht, Gert, Mertinkat, Reinhard, Heitmann, Axel
• Primary Examiner(s): Le; David D.
• Application Number:
  US10/947,883
• Publication Number:
  US 20050079942A1
• Time in Patent Office: 1,027 Days
• Field of Search: 475/5, 475/271, 475/275, 475/278, 475/284, 475/288, 475/311, 475/323, 477/3, 180/65.2, 180/65.4, 180/65.7
• US Class Current: 475/5
• CPC Class Codes: B60K 6/365 with the gears having orbital motion
• CPC Class Codes: B60K 6/40 characterised by the assembly or relative disposition of components
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60K 6/543 the transmission being a continuously variable transmission
• CPC Class Codes: B60K 6/547 the transmission being a stepped gearing
• CPC Class Codes: F16H 2200/2007 with two sets of orbital gears
• CPC Class Codes: F16H 2200/2023 using a Ravigneaux set with 4 connections
• CPC Class Codes: F16H 3/126 using an electric drive
• CPC Class Codes: F16H 3/663 with conveying rotary motion between axially spaced orbital gears, e.g. RAVIGNEAUX
• CPC Class Codes: F16H 3/666 with compound planetary gear units, e.g. two intermeshing orbital gears F16H3/663 takes precedence
• CPC Class Codes: F16H 61/0028 using a single pump driven by different power sources
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y10S 903/917 with transmission for changing gear ratio

Abstract

A drive train (1, 30) for a hybrid vehicle, in which an internal combustion engine (2) is drive-technologically connected to a disengagement clutch (4) whose output side is connected to a transmission input shaft (7), which is connected to an input element (8, 38) of an automatic transmission (17, 36), and in which the transmission input shaft (7) can be driven by an electric machine (5) and itself drives a hydraulic pump (6), which is drive-technologically arranged after the disengagement clutch (4) and before a shiftable starting element (F) of the automatic transmission (17, 36).

Claims

1. A drive train (1, 30) for a hybrid vehicle, the drive train having an internal combustion engine (2) connected to an input side of a disengagement clutch (4), an output side of the disengagement clutch (4) being permanently connected to a first end of a continuous transmission input shaft (7), a second end of the continuous transmission input shaft being permanently connected to an input element (8, 38) of an automatic transmission (17, 36), an electric machine (5) being connected to the continuous transmission input shaft (7) for driving the continuous transmission input shaft (7), a hydraulic pump (6) being arranged down stream of the disengagement clutch (4) and before a shiftable starting element (F) of the automatic transmission (17, 36) and driven by the continuous transmission input shaft, so that when the disengagement clutch (4) and the starting element (F) are both disengaged and the electric machine (5) is operating, only the continuous transmission input shaft (7), the input element (8, 38) of the automatic transmission (17, 36) and the hydraulic pump (6) are driven by the electric machine (5).

2. The drive train according to claim 1, wherein the hydraulic pump (6) is arranged drive-technologically between the electric machine (5) and the input element (8, 38) of the automatic transmission (17, 36).

3. The drive train according to claim 1, wherein the starting element (F) is one of a transmission brake and a transmission clutch.

4. The drive train according claim 1, wherein the automatic transmission (17, 36) is one of a variable-speed automatic transmission and a continuously variable automatic transmission.

5. The drive train according to claim 1, wherein the input element of the automatic transmission (17) is a planetary gear support (8) which supports planetary gear wheels (9, 10).

6. The drive train according claim 1, wherein a rotary oscillation damper (3) is arranged drive-technologically between the internal combustion engine (2) and the disengagement clutch (4).

7. The drive train according to claim 1, wherein the electric machine (5) is a starter-generator.

8. The drive train according to claim 7, wherein the electric machine (5) is one of an asynchronous machine and a permanently enerqized synchronous machine.

9. The drive train according to claim 1, wherein starting gears (9) of a planetary transmission (17) mesh with an annular gear wheel (11), the annular gear wheel being rotationally fixed connected with an input (19) of a second transmission clutch (A) and with an input (21) of a third transmission clutch (B).

10. The drive train according to claim 1, wherein an output (20) of a second transmission clutch (A) is connected to a third transmission shaft (15), whose external teeth (28) mesh with an intermediate gear wheel (13).

11. The drive train according to claim 1, wherein an output (22) of a third transmission clutch (B) is connected to a fourth transmission shaft (16), whose external teeth (29) mesh with a drive output gear (14) which meshes with a transmission output shaft (18).

12. The drive train according to claim 1, wherein a fourth transmission shaft (16) is connected to a brake element (23) of a transmission brake (C).

13. The drive train according to claim 1, wherein the input element (8, 38) is connected to an input (25) of a fourth transmission clutch (E).

14. The drive train according to claim 1, wherein an output (26) of a fourth transmission clutch (E) is connected to a second transmission shaft (12), on which are mounted an intermediate gear wheel (13) and a drive output gear (14) and the output (26) is connected to a rotary brake element (24) of a transmission brake (D).

15. The drive train according to claim 1, wherein a second transmission shaft (12) is coaxially surrounded by a third transmission shaft (15) and the third transmission shaft (15) is coaxially surrounded by a fourth transmission shaft (16).

16. The drive train according to claim 1, wherein the input element (38) is connected to an input side of a fourth transmission clutch (E) and to an annular gear wheel (37).

17. The drive train according to claim 16, wherein a gear wheel (32) meshes with the annular gear wheel (37) and with a sun gear wheel (31), and the sun gear wheel (31) in rotationally fixed connected with an output (27) of the starting element (F).

18. The drive train according to claim 16, wherein a gear wheel (32) is mounted to rotate on a support (33) which is connected to input elements (19, 21) of two transmission clutches (A and B).

19. A drive train (1, 30) for a hybrid vehicle, the drive train having an internal combustion engine (2) connected to an input side of a disengagement clutch (4), an output side of the disengagement clutch (4) being permanently connected to a first end of a continuous transmission input shaft (7), a second end of the continuous transmission input shaft (7) being permanently connected to an input element (8, 38) of an automatic transmission (17, 36), an electric machine (5) being connected to the continuous transmission input shaft (7) for driving the continuous transmission input shaft (7), a hydraulic pump (6) being arranged drive-technologically after the disengagement clutch (4) and before a shiftable starting element (F) of the automatic transmission (17, 36) and driven by the continuous transmission input shaft, so that when the disengagement clutch (4) and the shiftable starting element (F) are both disengaged and the electric machine (5) is operating, only the continuous transmission input shaft (7), the input element (8, 38) of the automatic transmission (17, 36) and the hydraulic pump (6) are driven by the electric machine (5);

and the shiftable starting element is a transmission brake (F) and has a brake element (27) connected to a sun gear wheel (35) which meshes with planetary gears (10) of the automatic transmission (17).

20. A hybrid vehicle drive train (1, 30) having an internal combustion engine (2) connected to an input side of a disengagement clutch (4) via an oscillation damper and an output side of the disengagement clutch (4) being directly connected to a first end of a transmission input shaft (7) which is directly connected to an input element (8, 38) of an automatic transmission (17, 36), an electric machine (5) is coupled to the transmission input shaft (7) for at least one of the driving and being driven by the transmission input shaft (7), and a hydraulic pump (6) being arranged after the disengagement clutch (4) but before a shiftable starting element (F) of the automatic transmission (17, 36) and driven by the transmission input shaft, so that when the disengagement clutch (4) and the starting element (F) are disengaged and the electric machine (5) is operated, only the transmission input shaft (7), the input element (8, 38) of the automatic transmission (17, 36) and the hydraulic pump (6) are driven by the electric machine (5) without any other automatic transmission element being driven by the electric machine (5).