9 results about "Continuously variable transmission" patented technology

A continuously variable transmission (1) for transmitting a driving force of an engine (VE) to a load (DW) to be driven, in particular in a vehicular drive line, provided with two hydraulic pumps (10, 11) for realising a pressurised supply of hydraulic transmission fluid for the actuation of the transmission (1), whereof a first pump (10) is driven by the engine (VE) and whereof a second pump (11) is driven by an electric motor independently from the engine (VE), and with a main hydraulic line (13), an auxiliary hydraulic line (15) and a line pressure valve (14) that control a pressure (Pline) in the main line (13) by allowing a surplus of transmission fluid to flow from the main line (13) into the auxiliary line (15), wherein the first pump (10) is connected to the main line (13) and wherein the second pump (11) is connected to the auxiliary line (15).

The invention relates to a mechanical speed-changing device, in particular to a variable torque type continuously variable transmission. The variable torque type continuously variable transmission realizes infinitely variable speed by changing torque of a speed-changing wheel through a speed-changing control rod. The working principle of the variable torque type continuously variable transmission is that a sliding block with a short shaft is mounted in a groove, in the radial direction, of a speed-changing wheel in the box; an eccentric shaft of a power wheel is connected with the short shaft of the sliding block through a transmission rod; a speed-changing control rod can control movement of the sliding block; the torque of the speed-changing wheel is changed through movement of the sliding block, so that the amplitude of the reciprocating rotation of the speed-changing wheel is changed and the reciprocating stroke of a rack meshed with the speed-changing wheel is changed; the reciprocating motion of the rack is transformed into homodromous rotation by a reversing wheel internally provided with an overrunning clutch; power is output through an output shaft. The radial groove of the speed-changing wheel also can lock the sliding block through isometric pin holes to form speed change with gears. The variable torque type continuously variable transmission is stable in process, large in transmission and suitable for speed change of a main shaft of an engine.

A transmission controller determines whether a shift returning to low, changing a speed ratio of a continuously variable transmission to the lowest when a vehicle decelerates, is being performed or not, calculates a primary pressure measured lower limit value at which a belt begins to slip actually, based on a deceleration of the vehicle and the speed ratio of the continuously variable transmission, and sets a lower limit value of a target value of the primary pressure during the shift returning to low as the primary pressure measured lower limit value.

A damping control device for an electric vehicle is having a continuously variable transmission between a motor and left and right front wheels. The damping control device drive system includes a feedback control unit, which suppresses a vibration accompanying a disturbance in the rotational speed of the motor, and an operation determination unit, which determines whether or not an absolute value of a second-order differential of the transmission ratio is equal to, or greater than, a predetermined value, wherein when the absolute value of the second-order differential of the transmission ratio is equal to, or greater than, the predetermined value. The feedback control unit performs control of the output torque of the motor whereby a compensation torque component for suppressing a vibration accompanying a gear shift is subtracted from a compensation torque.

A transmission control device includes a converter that converts continuous accelerator positions detected by an accelerator pedal sensor into a stepped step position, and a controller that controls the gear ratio of a continuously variable transmission based on the converted step position. The converter creates a hysteresis regarding the converted step position, when the accelerator depression amount increases, and when the accelerator depression amount decreases. In the case where the step position reaches a predetermined position or greater, the controller executes kick-down control where the gear ratio is controlled to a low side.

A Continuously Variable Transmission (CVT) belt inspection device comprising a detection section for a running track and a determination section for distinguishing at least whether the cause of that running track is a substance attributable to an impurity, such as metal powder, etc. or an object attributable to an irregular-shaped area based on the periodicity of that running track. Particularly, when the cause of a running track is determined to be a substance attributable to an innocuous impurity, such as metal powder, etc., unnecessary part replacements can be avoided and a significant cost reduction achieved.

The invention discloses a continuously variable transmission. The continuously variable transmission comprises a first shaft, a second shaft, a pair of driving rings and a control mechanism, wherein the first shaft rotates by carrying a first disc; the second shaft rotates by carrying a pair of second discs, and the second discs are arranged in a spaced mode along the second shaft; the first shaft and the second shaft make the first disc be located between the second discs and overlap with the second discs, and the surfaces, opposite to the second discs, of the first disc incline; the driving rings are located between the first disc and the second discs located at the two opposite sides of the first disc, and the end surfaces of the driving rings make contact with the surfaces, opposite to the second discs, of the first disc, so that power is transmitted between the first shaft and the second shaft; and the control mechanism is used for driving the driving rings to move relative to the first disc and the second discs, so that the relative radial positions of the driving rings, the first disc and the second discs are changed, and accordingly the speed of the continuously variable transmission is changed.

The invention discloses a manual wheelchair with stepless transmission ratio adjustment. Existing manual wheelchairs are very strenuous in climbing. The manual wheelchair in the invention comprises achair frame, hand-cranking wheel assemblies and continuously variable transmissions; the two hand-cranking wheel assemblies are arranged at the two sides of the bottom of the chair frame respectively;the hand-cranking wheel assembly comprises a main wheel, a hand wheel ring, a tubular wheel shaft and a driving rotating shaft; the tubular wheel shaft is supported at the bottom of the chair frame;the main wheel is fixed with the outer end of the tubular wheel shaft; the driving rotating shaft and the tubular wheel shaft are coaxially arranged, and form a rotating pair; the hand wheel ring is fixed with the outer end of the driving rotating shaft; the number of the continuously variable transmissions is two; the two continuously variable transmissions correspond to the two hand-cranking wheel assemblies respectively; and stepless adjustment of the transmission ratio of the driving rotating shaft to the tubular wheel shaft is achieved. The wheel and the hand wheel ring, which are fixed together, in the prior art are separated into mutual rotation; the transmission ratio of the wheel to the hand wheel ring is adjusted by arranging the continuously variable transmissions; and a user can adjust the transmission ratio conveniently according to the strength of the user and the current road condition.