WO1991005184A1 - An overdrive gearset for a hydrokinetic transmission - Google Patents
An overdrive gearset for a hydrokinetic transmission Download PDFInfo
- Publication number
- WO1991005184A1 WO1991005184A1 PCT/GB1990/001445 GB9001445W WO9105184A1 WO 1991005184 A1 WO1991005184 A1 WO 1991005184A1 GB 9001445 W GB9001445 W GB 9001445W WO 9105184 A1 WO9105184 A1 WO 9105184A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- input shaft
- pinion carrier
- power input
- outer race
- sun gear
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H37/00—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00
- F16H37/02—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00 comprising essentially only toothed or friction gearings
- F16H37/04—Combinations of toothed gearings only
- F16H37/042—Combinations of toothed gearings only change gear transmissions in group arrangement
- F16H37/046—Combinations of toothed gearings only change gear transmissions in group arrangement with an additional planetary gear train, e.g. creep gear, overdrive
Definitions
- his invention relates o the field of automatic power transmission, particularly to an overdrive gearset for an automotive transmission.
- U.S. Patent 4,649,763 describes a mechanical transmission in which gear shifts are made through operation of a hydraulic control valve system, the transmission having a torque converter, a planetary gear arrangement in the form of planetary overdrive gearset and a Simpson gearset.
- the turbine shaft of the torque converter is drivably connected to the planetary gear carrier of an overdrive gearset such that the planetary gear carrier includes a hub connected to the turbine shaft by serrations.
- the hub of the planetary carrier receives the inner bearing of an overrunning clutch, by which the driving torque in three lower forward speeds is transmitted to a central shaft drivably connected to the input element of the Simpson gearset.
- the hub of the planetary carrier must transmit driving torque from the turbine shaft to the inner bearing race of the overrunning clutch by way of clamping members to a pot-shaped attachment of the central shaft.
- the hub of the planetary carrier must support the front end of the central shaft radially and axially.
- Th,e invention seeks to provide an automatic transmission able to transmit high driving torque through an overdrive gearset operating with a transmission able to produce three lower speed ratios.
- a .nultiple speed transmission mechanism comprising a housing and multiple ratio gearing located in said housing, a hydrokinetic torque converter, a turbine shaft of said torque converter connected to a driving member, an overdrive gear mechanism comprising a planetary gearset disposed between the torque converter and the multiple ratio gearing, said planetary gearset including a ring gear drivably connected to an input of the multiple ratio gearing, a sun gear, a set of planet pinions meshing with the ring gear and the sun gear, and a planet pinion carrier rotatably supporting the planet pinions, the turbine shaft connected drivably to the pinion carrier; brake means including a brake drum connected to the sun gear for releasably holding the brake drum against rotation; clutch means for releasably connecting the pinion carrier and the brake drum; and overrunning clutch means for-producing a one driving connection between the pinion carrier and the input of the multiple gearing.
- the invention further provides an overdrive gear mechanism as hereinafter set forth in Claim 4 of the appended claims.
- the invention achieves its desired a m ⁇ cause the connection between the turbine shaft and the planetary gear carrier of the overdrive gearset includes an inner bearing race formed integrally on a thickened flange of the turbine shaft, the flange having a shoulder defining meshing teeth drivably connected with meshing teeth on the internal periphery of the planetary gear carrier.
- the driving torque which is increased in the starting range of the torque converter, can be transmitted directly by the blocking members of the overrunning clutch to a pot- shaped attachment of the central shaft. Therefore, no weak spots are caused by notched connections in the torque transmission path.
- FIG. 1 The figure shows a detail of an overdrive gearset for a hydrokinetic mechanical transmission for motor vehicles.
- the complete arrangement of this transmission is illustrated in U.S. Patent 4,649,763.
- Fir re 1A of the patent illustrates a hydrokinetic, mechanical transmission for which the overdrive gearset of the present invention can be used.
- the complete disclosure of U.S. patent 4,649,763 is herein incorporated by reference.
- a turbine shaft having one end connected to ' the turbine hub of a hydrokinetic torque converter has a shank portion 1, a thickened flange portion 2 and a journal portion 3.
- a planetary overdrive gearset 4 which includes sun gear 5, ring gear 6 and planetary pinions 7, engaged with the ring gear and sun gear, rotatably mounted on planetary pinion shafts 9 and supported on a planetary pinion carrier 8.
- Sun gear 5 is drivably connected at one axial end by a radial connector 10 to a hub portion 11 of a drum-shaped component 12 forming a cylinder on an actuating servo 13.
- This servo operates first clutch CL1 for the overdrive gearset 4.
- the drum-shaped component 12 is rotatably mounted by a bearing bushing 14 on attachment 15 formed on the pump casing 16, which seals the transmission casing at the front.
- Ring gear 6 is drivably connected by meshing teeth L7 to a cylindrical attachment 18 located on the front end of central shaft 19, which transmits input torque to a multiple speed ratio gearset located behind shaft 19.
- the thickened flanged portion 2 of the turbine shaft and attachment 18 of the central shaft 19 form the inner bearing race and the outer bearing race, respectively, of an overrunning clutch 20.
- the central shaft 19 is supported at its front end on the journal portion 3 of the turbine shaft 1 by a radial needle bearing 21.
- Shaft 19 is cn-ially on the thickened flange portion of the turbine shaft by an axial needle bearing 22. Torque produced by an engine is transmitted through a torque converter by shaft 19 to the gearset 4.
- Planetary gear carrier 8 includes a front cage portion 23 and a rear disc portion 24, which rotatably support planetary pinion shafts 9,
- the planet pinions 7 are rotatably mounted on pinion shafts 9 by needle bearings 25.
- a shoulder 26 Located on the drive side of the thickened flange portion 2 of the turbine shaft is a shoulder 26, on which are formed gear teeth 27 in meshing engagement with teeth 29 formed on the internal periphery 28 of the rear disc portion 24 of the planetary carrier 8.
- the torque transmission path is not interrupted by serrations, but instead is provided by the unitary design of the inner bearing race of the overrunning clutch 20 located on the thickened flange 2 of the turbine shaft. With this arrangement, higher driving torque can be transmitted within the space provided.
- the meshing connection between the teeth on shoulder 26 and the teeth on the internal periphery 28 of the rear disc portion 24 of the carrier 8 is a simple and low cost arrangement.
Abstract
A hydrokinetic automotive transmission includes a torque converter, planetary overdrive gearset (4) and a Simpson gearset arranged in a transmission casing. The turbine shaft (1) is drivably connected to a planetary carrier (8) of the overdrive gearset (4). A sun gear (5) is connected to the drum (12) of a hydraulically actuated brake (B1) and a ring gear (6) is connected to a central shaft (19) that carries torque to the input of a Simpson gearset. The sun gear (5) is held by the brake (B1), and the overdrive gearset (4) is connected to the planetary carrier (8) by a first clutch (CL1) whereby the gearset (4) is locked by a one-way clutch (20) arranged in parallel between the inner bearing race on the carrier and an outer bearing race on the central shaft. The inner bearing race is formed integrally on a flange portion (2) of the turbine shaft (1) having teeth (27) engaged with teeth (29) formed on the inner periphery (28) of the carrier.
Description
Title
AN OVERDRIVE GEARSET FOR A HYDROKINETIC TRANSMISSION
Field of the invention
his invention relates o the field of automatic power transmission, particularly to an overdrive gearset for an automotive transmission.
Description of the prior art
U.S. Patent 4,649,763 describes a mechanical transmission in which gear shifts are made through operation of a hydraulic control valve system, the transmission having a torque converter, a planetary gear arrangement in the form of planetary overdrive gearset and a Simpson gearset.
The turbine shaft of the torque converter is drivably connected to the planetary gear carrier of an overdrive gearset such that the planetary gear carrier includes a hub connected to the turbine shaft by serrations. The hub of the planetary carrier receives the inner bearing of an overrunning clutch, by which the driving torque in three lower forward speeds is transmitted to a central shaft drivably connected to the input element of the Simpson gearset.
The hub of the planetary carrier must transmit driving torque from the turbine shaft to the inner bearing race of the overrunning clutch by way of clamping members to a pot-shaped attachment of the central shaft. The hub of the planetary carrier must support the front end of the central shaft radially and axially.
However, because the connection between the turbine shaft and planetary gear carrier is such that the hub of the planetary gear carrier is connected to the turbine shaft
by serrations, the magnitude of the driving torque that can be transmitted is restricted by t e size of the space provided.
Object of the invention
Th,e invention seeks to provide an automatic transmission able to transmit high driving torque through an overdrive gearset operating with a transmission able to produce three lower speed ratios.
Summary of the invention
According to one aspect of the invention, there is provided in a .nultiple speed transmission mechanism comprising a housing and multiple ratio gearing located in said housing, a hydrokinetic torque converter, a turbine shaft of said torque converter connected to a driving member, an overdrive gear mechanism comprising a planetary gearset disposed between the torque converter and the multiple ratio gearing, said planetary gearset including a ring gear drivably connected to an input of the multiple ratio gearing, a sun gear, a set of planet pinions meshing with the ring gear and the sun gear, and a planet pinion carrier rotatably supporting the planet pinions, the turbine shaft connected drivably to the pinion carrier; brake means including a brake drum connected to the sun gear for releasably holding the brake drum against rotation; clutch means for releasably connecting the pinion carrier and the brake drum; and overrunning clutch means for-producing a one driving connection between the pinion carrier and the input of the multiple gearing.
The invention further provides an overdrive gear mechanism as hereinafter set forth in Claim 4 of the appended claims.
The invention achieves its desired a m βcause the connection between the turbine shaft and the planetary gear carrier of the overdrive gearset includes an inner bearing race formed integrally on a thickened flange of the turbine shaft, the flange having a shoulder defining meshing teeth drivably connected with meshing teeth on the internal periphery of the planetary gear carrier.
Since the inner bearing race of the overrunning clutch is formed on a thickened flange of the turbine shaft, the driving torque, which is increased in the starting range of the torque converter, can be transmitted directly by the blocking members of the overrunning clutch to a pot- shaped attachment of the central shaft. Therefore, no weak spots are caused by notched connections in the torque transmission path.
Transmission of the driving torque from the turbine shaft through the meshing teeth of the planetary gear carrier is necessary only in overdrive, where the torque converter normally operates in its coupling mode. Consequently, only normal engine torque need be transmitted.
Brief description of the drawing
The invention is described in more detail with reference to the embodiment illustrated in the drawing in which the single figure shows a vertical partial cross section through an overdrive gearset of a hydrokinetic, mechanical transmission for motor vehicles. The connection between the turbine shaft and planetary gear carrier are illustrated.
Description of the preferred embodiment
The figure shows a detail of an overdrive gearset for a hydrokinetic mechanical transmission for motor vehicles. The complete arrangement of this transmission is
illustrated in U.S. Patent 4,649,763. In particular, Fir re 1A of the patent illustrates a hydrokinetic, mechanical transmission for which the overdrive gearset of the present invention can be used. The complete disclosure of U.S. patent 4,649,763 is herein incorporated by reference.
A turbine shaft having one end connected to' the turbine hub of a hydrokinetic torque converter has a shank portion 1, a thickened flange portion 2 and a journal portion 3.
Located on the drive side of the shank portion, there is arranged a planetary overdrive gearset 4, which includes sun gear 5, ring gear 6 and planetary pinions 7, engaged with the ring gear and sun gear, rotatably mounted on planetary pinion shafts 9 and supported on a planetary pinion carrier 8.
Sun gear 5 is drivably connected at one axial end by a radial connector 10 to a hub portion 11 of a drum-shaped component 12 forming a cylinder on an actuating servo 13. This servo operates first clutch CL1 for the overdrive gearset 4. The drum-shaped component 12 is rotatably mounted by a bearing bushing 14 on attachment 15 formed on the pump casing 16, which seals the transmission casing at the front.
Ring gear 6 is drivably connected by meshing teeth L7 to a cylindrical attachment 18 located on the front end of central shaft 19, which transmits input torque to a multiple speed ratio gearset located behind shaft 19. The thickened flanged portion 2 of the turbine shaft and attachment 18 of the central shaft 19 form the inner bearing race and the outer bearing race, respectively, of an overrunning clutch 20.
The central shaft 19 is supported at its front end on the journal portion 3 of the turbine shaft 1 by a radial
needle bearing 21. Shaft 19 is
cn-ially on the thickened flange portion of the turbine shaft by an axial needle bearing 22. Torque produced by an engine is transmitted through a torque converter by shaft 19 to the gearset 4.
Planetary gear carrier 8 includes a front cage portion 23 and a rear disc portion 24, which rotatably support planetary pinion shafts 9, The planet pinions 7 are rotatably mounted on pinion shafts 9 by needle bearings 25.
Located on the drive side of the thickened flange portion 2 of the turbine shaft is a shoulder 26, on which are formed gear teeth 27 in meshing engagement with teeth 29 formed on the internal periphery 28 of the rear disc portion 24 of the planetary carrier 8.
The torque transmission path is not interrupted by serrations, but instead is provided by the unitary design of the inner bearing race of the overrunning clutch 20 located on the thickened flange 2 of the turbine shaft. With this arrangement, higher driving torque can be transmitted within the space provided.
The meshing connection between the teeth on shoulder 26 and the teeth on the internal periphery 28 of the rear disc portion 24 of the carrier 8 is a simple and low cost arrangement.
Claims
1. In a multiple speed transmission mechanism comprising a housing and multiple ratio gearing located in said housing, a hydrokinetic torque converter, a turbine shaft of said torque converter connected to a driving member, an overdrive gear mechanism comprising
a planetary gearset disposed between the torque converter and the multiple ratio gearing, said planetary gearset including a ring gear drivably connected to an input of the multiple ratio gearing, a sun gear, a set of planet pinions meshing with the ring gear and the sun gear, and a planet pinion carrier rotatably supporting the planet pinions, the turbine shaft connected drivably to the pinion carrier;
brake means including a brake drum connected to the sun gear for releasably holding the brake drum against rotation;
clutch means for releasably connecting the pinion carrier and the brake drum; and
overrunning clutch means for producing a one driving connection between the pinion carrier and the input of the multiple gearing.
2. A mechanism as claimed in claim 1, wherein the overrunning clutch means includes
an outer race formed integrally with and located on the input shaft of the multiple ratio gearing;
an inner race aligned axially with the outer race, spaced radially from the outer race and located on the turbine shaft; and a drive element located radially Let*<-.--... the inner race and the outer race.
3. A mechanism as claimed in claim 1, further comprising
first radially directed teeth extending outward from and distributed around the periphery of the turbine shaft; and
second teeth extending radially from and distributed around a periphery of the pinion carrier, in drivable meshing engagement with the first teeth.
4. An overdrive gear mechanism comprising
a first power input shaft;
multiple ratio gearing;
a second power input shaft connected to the multiple ratio gearing;
a planetary gearset disposed between the first power input shaft and the multiple ratio gearing, said planetary gearset including a ring gear drivably connected to the second power input shaft, a sun gear, a set of planet pinions meshing with the ring gear and the sun gear, and a planet pinion carrier rotatably supporting the planet pinions, the first power input shaft connected drivably to the pinion carrier;
brake means including a brake drum connected to the sun gear for releasably holding the brake drum against rotation;
clutch means for releasably connecting th pinion carrier and the brake drum; and overrunning clutch means for producing a one driving connection between the pinion carrier and the second power input shaft.
5. A mechanism as claimed in claim 4, wherein the overrunning clutch means includes
an outer race formed integrally with the second power input shaft;
an inner race aligned axially with the outer race, spaced radially from the outer race and located on the first power input shaft; and
a drive element located radially between the inner race and the outer race.
6. A mechanism as claimed in claim 4 further comprising
first radially directed teeth extending outwardly from and distributed around the periphery of the first power input shaft; and
second teeth extending radially from and distributed around a periphery of the pinion carrier, in drivable meshing engagement with the first teeth
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3932218.1 | 1989-09-27 | ||
| DE3932218 | 1989-09-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1991005184A1 true WO1991005184A1 (en) | 1991-04-18 |
Family
ID=6390292
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/GB1990/001445 WO1991005184A1 (en) | 1989-09-27 | 1990-09-19 | An overdrive gearset for a hydrokinetic transmission |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO1991005184A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994012810A1 (en) * | 1992-11-27 | 1994-06-09 | Fichtel & Sachs Ag | A planetary gear driven power consuming unit |
| DE4300146A1 (en) * | 1993-01-08 | 1994-07-14 | Zwl Zahnradwerk Leipzig Gmbh | Planetary drive for IC engine ancillary equipment |
| US5358456A (en) * | 1991-06-07 | 1994-10-25 | Fichtel & Sachs Ag | Gear unit for combination with an auxiliary power consuming unit of a motor-vehicle |
| WO2007076749A2 (en) * | 2005-12-22 | 2007-07-12 | Luk Lamellen Und Kupplungsbau Beteiligungs Kg | Combined torque converter and transmission system and method therefor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4036081A (en) * | 1975-03-06 | 1977-07-19 | Toyota Jidosha Kogyo Kabushiki Kaisha | Overdrive mechanism for automotive power transmission |
| US4649763A (en) * | 1984-05-12 | 1987-03-17 | Ford Motor Company | Multiple-speed, hydrokinetic transmission |
| US4798103A (en) * | 1987-01-28 | 1989-01-17 | Chrysler Motors Corporation | Automatic transmission with add-on overdrive |
-
1990
- 1990-09-19 WO PCT/GB1990/001445 patent/WO1991005184A1/en unknown
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4036081A (en) * | 1975-03-06 | 1977-07-19 | Toyota Jidosha Kogyo Kabushiki Kaisha | Overdrive mechanism for automotive power transmission |
| US4649763A (en) * | 1984-05-12 | 1987-03-17 | Ford Motor Company | Multiple-speed, hydrokinetic transmission |
| US4798103A (en) * | 1987-01-28 | 1989-01-17 | Chrysler Motors Corporation | Automatic transmission with add-on overdrive |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5358456A (en) * | 1991-06-07 | 1994-10-25 | Fichtel & Sachs Ag | Gear unit for combination with an auxiliary power consuming unit of a motor-vehicle |
| WO1994012810A1 (en) * | 1992-11-27 | 1994-06-09 | Fichtel & Sachs Ag | A planetary gear driven power consuming unit |
| DE4300146A1 (en) * | 1993-01-08 | 1994-07-14 | Zwl Zahnradwerk Leipzig Gmbh | Planetary drive for IC engine ancillary equipment |
| WO2007076749A2 (en) * | 2005-12-22 | 2007-07-12 | Luk Lamellen Und Kupplungsbau Beteiligungs Kg | Combined torque converter and transmission system and method therefor |
| WO2007076749A3 (en) * | 2005-12-22 | 2007-08-23 | Luk Lamellen & Kupplungsbau | Combined torque converter and transmission system and method therefor |
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