Patent ID: 8620539
Filing Date: 2013-12-31
Classification: F16H

Abstract:
1. A continuously-variable transmission for a vehicle, comprising: a belt-type continuously-variable transmitting mechanism connected to a drive source and configured to continuously vary a speed ratio of the belt-type continuously-variable transmitting mechanism; an auxiliary transmitting mechanism provided in series with the belt-type continuously-variable transmitting mechanism and configured to attain a plurality of shift steps for a forward running of the vehicle; and a speed-increasing gear mechanism provided upstream from the auxiliary transmitting mechanism and configured to increase an input rotational speed of the auxiliary transmitting mechanism, wherein the speed-increasing gear mechanism is configured to set a speed increasing ratio of the speed-increasing gear mechanism at a value between an upper limit value and a lower limit value in accordance with a required performance, wherein the upper limit value is a speed-increasing-ratio value at which it begins to be judged that a power performance is reduced when the speed increasing ratio is further increased, and wherein the lower limit value is a speed-increasing-ratio value at which it begins to be judged that a suppressing effect of pull-in shock is reduced when the second speed-increasing-ratio is further lowered.