Continuously variable transmission

Details Continuously variable transmission Continuously variable transmission

2000-01-07

2001-12-25

Bucci, David A. (Department: 3682)

Planetary gear transmission systems or components

Nonplanetary variable speed or direction transmission...

Nonplanetary transmission is belt or chain gearing

C474S029000, C474S018000

Reexamination Certificate

active

06332856

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a continuously variable transmission and more particularly a continuously variable transmission which, while ensuring a compact layout, can make a change of speed during stop of the associated vehicle, can protect a belt at the time of sudden braking, and can improve the starting performance of the vehicle.
BACKGROUND OF THE INVENTION
In a vehicle, a transmission is provided in a path between an engine and driving wheels to make conversion into a rotational speed and a torque, both corresponding to required characteristics. As such a transmission, there is known a continuously variable transmission wherein a driving pulley comprising a fixed driving pulley piece and a movable driving pulley piece is mounted on a driving shaft, a driven pulley comprising a fixed driving pulley piece and a movable driven pulley piece is mounted on a driven shaft, and a belt is entrained on both the driving pulley and the driven pulley.
FIG. 3
shows a conventional continuously variable transmission. In
FIG. 3
, the reference numeral
202
denotes an engine,
204
denotes a crank shaft,
206
denotes a continuously variable transmission,
208
a driving shaft,
210
a driven shaft,
212
a driving pulley,
214
a driven pulley, and
216
a belt. In the continuously variable transmission
206
, the driving pulley
212
is mounted on the driving shaft
208
which is coaxial with the crank shaft
204
of the engine
202
, the driven pulley
214
is mounted on the driven shaft
210
which is disposed in parallel with the driving shaft
208
, and the belt
216
is entrained on both driving pulley
212
and driven pulley
214
.
The driving pulley
212
comprises a first fixed driving pulley piece
218
fixed onto the driving shaft
208
and a second movable driving pulley piece
220
which is mounted on the driving shaft
208
in an axially movable and non-rotatable manner relative to the shaft
208
. The driven pulley
214
comprises a first fixed driven pulley piece
222
fixed onto the driven shaft
210
and a second movable driven pulley piece
224
which is mounted on the driven shaft
210
in an axially movable and non-rotatable manner relative to the shaft
210
.
In the continuously variable transmission
206
, the driving shaft
208
is rotatably fitted on an input shaft
226
which is coaxial with the crank shaft
204
, a forward/reverse change-over mechanism
228
is mounted on the input shaft
226
at a position between an output side/end of the input shaft
226
spaced apart from the engine
202
and an input side/end of the driving shaft
208
spaced apart a longer distance from the engine
202
than the driving pulley
212
, an output shaft
230
is rotatably fitted on the driven shaft
210
on an output side/end closer to the engine
202
than the driven pulley
214
, an output clutch
232
is disposed between the output side/end of the driven shaft
210
and the input side/end of the output shaft
230
, a reduction gear train
236
is disposed between the output shaft
230
and a counter shaft
234
disposed in parallel with the output shaft
230
, and a final gear train
242
is disposed between the counter shaft
234
and a differential case
240
of a differential
238
disposed in parallel with the counter shaft
234
.
In a continuously variable transmission
306
shown in
FIG. 4
, a driving pulley
312
comprising a first fixed driving pulley piece
318
and a second movable driving pulley piece
20
is mounted on a driving shaft
308
which is coaxial with a crank shaft
304
of an engine
302
, a driven pulley
314
comprising a first fixed driven pulley piece
322
and a second movable driven pulley piece
324
is mounted on a driven shaft
310
disposed in parallel with the driving shaft
308
, and a belt
316
is entrained on both driving pulley
312
and driven pulley
314
.
In the continuously variable transmission
306
, an input shaft
326
, which is coaxial with the crank shaft
304
and the driving shaft
308
, is mounted on an input side/end of the driving shaft
308
closer to the engine
202
than the driving pulley
312
, a torque converter
344
and a forward/reverse change-over mechanism
328
are mounted on the input shaft
326
, a reduction gear train
336
is disposed between an output side/end of the driven shaft
310
and a counter shaft
334
disposed in parallel with the driven shaft
310
, and a final gear train
342
is disposed between the counter shaft
334
and a differential case
340
of a differential
338
disposed in parallel with the counter shaft
332
.
In a continuously variable transmission
406
shown in
FIG. 5
, a driving pulley
412
comprising a first fixed driving pulley piece
418
and a second movable driving pulley piece
420
is mounted on a driving shaft
408
which is coaxial with a crank shaft
404
of an engine
402
, a driven pulley
414
comprising a first fixed driven pulley piece
422
and a second movable driven pulley piece
424
is mounted on a driven shaft
410
disposed in parallel with the driving shaft
408
, and a belt
416
is entreained on both driving pulley
412
and driven pulley
414
.
In the continuously variable transmission
406
, an input shaft
426
coaxial with both crank shaft
404
and driving shaft
408
is disposed on an input side/end of the driving shaft
408
closer to the engine
402
than the driving pulley
412
, an electromagnetic clutch
446
and a forward/reverse change-over mechanism
428
are mounted on the input shaft
426
, a reduction gear train
436
is disposed between an output side/end of the driven shaft
410
and a counter shaft
434
disposed in parallel with the driven shaft
410
, and a final gear train
442
is disposed between the counter shaft
434
and a differential case
440
of a differential
438
disposed in parallel with the counter shaft
434
.
In a continuously variable transmission
506
shown in
FIG. 6
, a driving pulley
512
comprising a first fixed driving pulley piece
518
and a second movable driving pulley piece
520
is mounted on a driving shaft
508
which is coaxial with a crank shaft
504
of an engine
502
, a driven pulley
514
comprising a first fixed driven pulley piece
522
and a second movable driven pulley piece
524
is mounted on a driven shaft
510
disposed in parallel with the driving shaft
508
, and a belt
516
is entrained on both driving pulley
512
and driven pulley
514
.
In the continuously variable transmission
506
, an output shaft
530
is rotatably fitted on the driven shaft
510
on an output side/end spaced apart a longer distance from the engine
502
than the driven pulley
514
, an output clutch
532
is disposed between an output side/end of the driven shaft
510
and an input side/end of the output shaft
530
spaced apart from the engine
502
, a forward/reverse change-over mechanism
528
is disposed between an output side/end of the output shaft
530
close to the engine
502
and an input side/end of a counter shaft
534
spaced apart from the engine
502
, the counter shaft
534
being disposed in parallel with the output shaft
530
, and a final gear train
542
is disposed between an output side/end of the counter shaft
534
close to the engine
502
and a differential case
540
of a differential
538
disposed in parallel with the counter shaft
534
.
In a continuously variable transmission
606
shown in
FIG. 7
, a driving pulley
612
comprising a first fixed driving pulley piece
618
and a second movable driving pulley piece
620
is mounted on a driving shaft
608
which is coaxial with a crank shaft
604
of an engine
602
, a driven pulley
614
comprising a first fixed driven pulley piece
622
and a second movable driven pulley piece
624
is mounted on a driven shaft
610
disposed in parallel with the driving shaft
608
, and a belt
616
is entrained on both driving pulley
612
and driven pulley
614
.
In the continuously variable transmission
606
, an input shaft
626
coaxial with both crank shaft
604
and driving shaft
608
is dispo

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