TH48109A - V-belt type automatic transmission for vehicles - Google Patents

Abstract

The DC60 is designed to provide a V-belt automatic transmission for vehicles capable of achieving smooth shifting. The V-belt automatic transmission for the vehicle is equipped with drive pulley 38 and driven pulley 48, where centrifugal weights 42 and 43, positioned between the movable pulley 40 of drive pulley 38 and cam plate 41, are moved radially by centrifugal force. The sheath radius of the V-belt 67, looped around drive pulley 38 and driven pulley 48, is changed. The maximum gear ratio in the low-speed range and the minimum gear ratio in the high-speed range are set. The radial movement of centrifugal weight 43, one of centrifugal weights 42 and 43, is effectively prevented by a stopping surface 40h at medium speeds, and the medium gear ratio is set. Centrifugal weight 43 is made lighter. The remaining centrifugal weight 42, and the stopping surface 40h, are tilted, and thus the compressive force which compresses the centrifugal weight 43 against the cam plate 41 is generated. To provide a V-belt automatic transmission for a vehicle capable of achieving smooth transmission, the V-belt automatic transmission for the vehicle is provided with a drive pulley 38 and a driven pulley 48, where a number of centrifugal weights 42 and 43, positioned between the movable pulley 40 of the drive pulley 38 and the cam plate 41, are moved radially by centrifugal force, the sheath radius of the V-belt 67 looping around the drive pulley 38 and driven pulley 48 is changed, the maximum gear ratio in the speed range is determined. With low and minimum gear ratios in the high speed range, the radial movement of centrifugal force 43, one of the number of centrifugal force 42 and 43, will be effectively prevented by stopping surface 40h. At medium speeds in the high speed range, and with the medium gear ratio set, centrifugal force 43 will be lighter than the remaining centrifugal force 42, and stopping surface 40h will be tilted, thus generating the compressive force that compresses centrifugal force 43 against cam plate 41.

Claims (4)

1. A V-belt automatic transmission system for carriers, with a radial V-belt covering, is looped around a drive pulley arranged on the engine drive shaft and a driven pulley arranged on the driven shaft to transmit torque from the drive shaft to the driven shaft, which varies based on radial movement along the two leading surfaces of a certain centrifugal force arranged between the side leading surfaces of the pulley arranged on the movable pulley of the drive pulley and the side leading surface of the cam arranged on the camshaft. The maximum gear ratio in the low-speed range and the minimum gear ratio in the high-speed range are set, and some of the centrifugal force is virtually prevented from moving in the radial direction at speeds faster than the specified rotational speed in the medium-speed range, which allows setting the medium gear ratio in the medium-speed range, where some of the centrifugal force is lighter than the remaining centrifugal force. 2. A V-belt automatic transmission system for vehicles, which has a radial sheath of the V-belt, which is looped around a drive pulley provided on the engine drive shaft and a driven pulley provided on the driven shaft to transmit torque from the drive shaft to the driven shaft, which varies based on radial movement along the two leading surfaces of a certain centrifugal weight arranged between the side leading surfaces of the pulley provided on the movable pulley of the drive pulley and the side leading surface of the cam provided on the cam plate, the maximum gear ratio in the low speed range and the minimum gear ratio in the high speed range are set, and some of the centrifugal weight is virtually prevented from moving in the radial direction at a given rotational speed in the medium speed range, which allows setting the medium gear ratio in the medium speed range, where the stopping surface provided on the movable pulley, which virtually prevents some of the centrifugal weight from moving in the radial direction, or the stopping surface provided on the cam plate, is tilted so that the force for thrust is applied. A portion of the centrifugal weights opposes the stop plate. A cam is generated based on the contact of some of these centrifugal weights with the stop surface. 3. The V-belt automatic transmission system for the carriers of Patent 3 provides for a driving pulley coupled to the engine drive shaft, a driven pulley coupled to the driven shaft, and a V-belt looped around the driving and driven pulleys to transmit the rotational power of the driving pulley to the driven pulley. The sheathing radius of the V-belt around the driving and driven pulleys is changed by the movement of the movable end of the driving pulley against the force of a response spring on the movable end of the driving pulley, which is moved by the centrifugal force of the centrifugal weight. The spring is a cylindrical coil spring, and the outer circumferential surface of the ends of the cylindrical spring conductor arranged inside the spring is tapered, with the outer diameter decreasing towards the ends. 4. An automatic V-belt transmission system for vehicles under Patent 3, consisting of a self-lubricating synthetic resin spring guide.