EP0147646A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Continuously variable vehicular transmission
Assignee: Toyota Central R&D Labs Inc
•
Filing: 1984-11-27
•
Granted: —
•
Expires: 2004-11-27
Abstract
Abstract A continuously variable transmission for vehicular use including a torque converter (2), a continuously variable transmission mechanism (CVT, 5), and a rotation transmission mechanism (4) of a variable ratio having at least reverse and forward low-speed ranges of large reduction ratios and a forward high-speed range of small reduction ratio and which is equipped with a planetary gear mechanism (40). A torque transmission passage from the output shaft (24) of the torque converter to the output shaft (7) of the vehicular continuously variable transmission is divided into two torque transmission passages through the CVT (5) and to the rotation transmission mechanism (4) of variable ratio, so that in at least one of the speed ranges of large reduction ratios, the torque transmission passage through the CVT (5) is disconnected from the output shaft (7) of the vehicular continuously variable transmisson so as to not apply a large torque to the CVT (5) in that case, whereas, in the speed range of small reduction ratio, the torque through the CVT and the torque through the rotation transmission mechanism (4) of variable ratio are app'ied to the output shaft (7) of the vehicular continuously variable transmission. Accordingly, the torque borne by the CVT (5) is reduced so that it does not exceed the engine torque.
Inventors
- 👤 Masaharu Sumiyoshi
- 👤 Fumio Matsunari
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 03:40
CPC Classifications
F; F16; F16H; F16H37/00; F16H37/02; F16H37/06; F16H37/08; F16H37/0833; F16H37/084; F16H37/0846; F16H47/00; F16H47/06; F16H47/065; F16H2037/088; F16H2037/0886
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
382 words
A continuously variable transmission for a vehicle, comprising: a torque converter (2) driven by an engine (1); an input shaft (24, 79) connected to said torque converter; an output shaft (7) of said vehicular continuously variable transmission; a rotation transmission mechanism (4) of variable ratio including a planetary gear mechanism (40, 70) and a controller (90) for controlling rotational states of elements of said planetary gear mechanism (40, 70), said rotation transmission mechanism (4) having at least reverse and forward low-speed ranges of large reduction ratios and a forward high-speed range of small reduction ratio; and a belt-type continuously variable transmission mechanism (5) including an input pulley (51) and an output pulley (61), each having a stationary flange (52, 62) and a movable fLange (53, 63) axially movable with respect to said stationary flange, and rotation transmitting means (58) of an endless belt type running on said two pulleys, characterized in that said rotation transmission mechanism (4) of variable ratio is connected to said input shaft (24) and said output shaft (7); said belt type continuously variable transmission mechanism (5) has an output pulley (61) provided on a sleeve (68) mounted rotatably on said output shaft (7) or said input shaft (79) and an input pulley (51) connected to said input shaft; clutch means (93, 95, 96) is provided for providing releasable engagement between said sleeve (68) of the output pulley of said belt-type continuously variable transmission mechanism (4) and said output shaft (7); and wherein when said planetary gear mechanism (40) of said rotation transmission mechanism (4) of variable ratio is in a speed range of small reduction ratio, said clutch means is applied to sum a torque outputted to said output shaft (7) of said vehicular variable transmission via said rotation transmission mechanism (4) of variable ratio and a torque outputted via said belt-type continuously variable transmission mechanism (5), whereas, when said planetary gear mechanism is in at least a forward low-speed range of large reduction ratio, said clutch means is released to make said sleeve (68) of said output pulley (61) of said belt-type continuously variable transmission mechanism (5) rotatable with respect to said output shaft (7) of said vehicular continuously variable transmission thereby to output only said torque outputted via said rotation transmission mechanism (4) of variable ratio.
Claim 2
Dependent Claim
382 words
A continuously variable transmission for a vehicle, comprising: a torque converter (2) driven by an engine (1); an input shaft (24, 79) connected to said torque converter; an output shaft (7) of said vehicular continuously variable transmission; a rotation transmission mechanism (4) of variable ratio including a planetary gear mechanism (40, 70) and a controller (90) for controlling rotational states of elements of said planetary gear mechanism (40, 70), said rotation transmission mechanism (4) having at least reverse and forward low-speed ranges of large reduction ratios and a forward high-speed range of small reduction ratio; and a belt-type continuously variable transmission mechanism (5) including an input pulley (51) and an output pulley (61), each having a stationary flange (52, 62) and a movable fLange (53, 63) axially movable with respect to said stationary flange, and rotation transmitting means (58) of an endless belt type running on said two pulleys, characterized in that said rotation transmission mechanism (4) of variable ratio is connected to said input shaft (24) and said output shaft (7); said belt type continuously variable transmission mechanism (5) has an output pulley (61) provided on a sleeve (68) mounted rotatably on said output shaft (7) or said input shaft (79) and an input pulley (51) connected to said input shaft; clutch means (93, 95, 96) is provided for providing releasable engagement between said sleeve (68) of the output pulley of said belt-type continuously variable transmission mechanism (4) and said output shaft (7); and wherein when said planetary gear mechanism (40) of said rotation transmission mechanism (4) of variable ratio is in a speed range of small reduction ratio, said clutch means is applied to sum a torque outputted to said output shaft (7) of said vehicular variable transmission via said rotation transmission mechanism (4) of variable ratio and a torque outputted via said belt-type continuously variable transmission mechanism (5), whereas, when said planetary gear mechanism is in at least a forward low-speed range of large reduction ratio, said clutch means is released to make said sleeve (68) of said output pulley (61) of said belt-type continuously variable transmission mechanism (5) rotatable with respect to said output shaft (7) of said vehicular continuously variable transmission thereby to output only said torque outputted via said rotation transmission mechanism (4) of variable ratio.
Claim 3
Dependent Claim
33 words
The vehicular continuously variable transmission as set forth in claim 1, wherein said clutch means (93, 95, 96) forms a part of a controller (90) of said rotation transmi.ssion mechanism of variable ratio.
Claim 4
Dependent Claim
33 words
The vehicular continuously variable transmission as set forth in claim 1 or 2, further comprising: a rotation transmission mechanism (3) of constant ratio provided between said input shaft (24) and output shaft (7).
Claim 5
Dependent Claim
193 words
The vehicular continuously variable transmission as set forth in one of claims 1 to 3, wherein said rotation transmission mechanism (4) of variable ratio comprises: a planetary gear mechanism (40) comprising a sun gear (41) connected to said output shaft of said torque converter (2), a first planetary pinion (43) borne rotatably on a carrier (48) connected to said output shaft (7) of said vehicular continuously variable transmission (4) and meshing with said first sun gear (41), a second sun gear (42) borne rotatably on said output shaft (7) of said vehicular continuously variable transmission (4), a second planetary pinion (44) borne rotatably on said carrier (48) and meshing with said first planetary pinion (43) and said second sun gear (42), and a ring gear (45) meshing with said second planetary pinion (44); and a controller (90) having a first brake (91) for braking said ring gear (45), a second brake (92) for braking said second sun gear (42) through a one-way clutch (94), and a clutch (93) for releasably connecting said second sun gear (42) with said sleeve (68) of said output pulley (61) of said belt-type continuously variable transmission mechanism (5).
Claim 6
Dependent Claim
217 words
The vehicular continuously variable transmission as set forth in one of claims 1 to 3 wherein said rotation transmission mechanism of variable type (4) comprises: a planetary gear mechanism (70) comprising a first sun gear (71) borne rotatably on said output shaft (7) of said vehicular continuously variable transmission (4), a first planetary pinion (72) borne rotatably on a first carrier (74), connected to said output shaft (7) and meshing with said first sun gear (71), a first ring gear (73) meshing with said first planetary pinion (72), a second sun gear (75) borne on said output shaft (7) and rotating with said first sun gear (71), a second planetary pinion (76) meshing with said second sun gear (75), and a second ring gear (77) connected with said output shaft (7) and meshing with said second planetary pinion (76); and a controller (90) having a first clutch (95) for releasably connecting said first ring gear (73) with said output shaft of said torque converter (2), a second clutch (96) for releasably connecting said first sun gear (71) and said second sun gear (75) with said sleeve (68) of the output pulley (61) of said belt-type continuously variable transmission mechanism (5), and a brake (97) for braking a second carrier (78) bearing rotatably said second planetary pinion (76).
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.