A large-torque chain-guide type constant ratio/continuously variable transmission is disclosed. The transmission comprises transmission rollers (A, B), an endless transmission chain or belt (C) and two chain guiders (D, E) respectively arranged beside the two transmission rollers. Each chain guider comprises n groups of grooved-pulleys, and each group comprises m grooved-pulleys. Each grooved-pulley rotates freely around a grooved-pulley axis, and an angle is formed between the axis of at least one grooved-pulley in each group of grooved-pulleys and a roller axis of the transmission roller matched with the same grooved-pulley. The angle enables the chain entering the chain guider and the chain leaving the chain guider to move a certain axial distance, i.e. a chain distance, on the transmission rollers, wherein the chain distance is required to be larger than the width of the chain or the belt. The endless transmission chain passes sequentially through the pulley groove of at least one grooved-pulley in one group and the driving roller under the guidance of the chain guider, and is guided to a driven roller after winding n circles around both the chain guider and the driving roller. Whereafter, the transmission chain passes sequentially through the pulley groove of at least one grooved-pulley in one group and the driven roller under the guidance of the chain guider, and returns to the driving roller to be closed after winding n circles around both the chain guider and the driven roller. The transmission has small size and compact structure, and can output a large torque.

A large-torque chain-guide type constant ratio/continuously variable transmission is disclosed. The transmission comprises transmission rollers (A, B), an endless transmission chain or belt (C) and two chain guiders (D, E) respectively arranged beside the two transmission rollers. Each chain guider comprises n groups of grooved-pulleys, and each group comprises m grooved-pulleys. Each grooved-pulley rotates freely around a grooved-pulley axis, and an angle is formed between the axis of at least one grooved-pulley in each group of grooved-pulleys and a roller axis of the transmission roller matched with the same grooved-pulley. The angle enables the chain entering the chain guider and the chain leaving the chain guider to move a certain axial distance, i.e. a chain distance, on the transmission rollers, wherein the chain distance is required to be larger than the width of the chain or the belt. The endless transmission chain passes sequentially through the pulley groove of at least one grooved-pulley in one group and the driving roller under the guidance of the chain guider, and is guided to a driven roller after winding n circles around both the chain guider and the driving roller. Whereafter, the transmission chain passes sequentially through the pulley groove of at least one grooved-pulley in one group and the driven roller under the guidance of the chain guider, and returns to the driving roller to be closed after winding n circles around both the chain guider and the driven roller. The transmission has small size and compact structure, and can output a large torque.

A toothed CVT using a Cone with One Torque Transmitting Member that is coupled by a Transmission Belt to another Cone with One Torque Transmitting Member for which teeth re-engagement between the Torque Transmitting Members and their Transmission Belt is improved. Said CVT uses a slack-side Tensioning Pulley in order to maintain the tension in the slack-side of the Transmission Belt almost constant so as to ensure smooth re-engagement of the Driven Cone; and a Transmission Diameter Compensating Mechanism, which increases the Transmission Diameter of the Driving Cone when the torque being pulled by the Driving Cone is increased, in order to compensate for an increase in Transmission Belt Teeth Compression and an increase in stretching of the tense-side of the Transmission Belt, due to an increase in tension in the tense-side of the Transmission Belt when an increased torque is transmitted; to ensure smooth re-engagement of the Driving Cone.

A toothed CVT using a Cone with One Torque Transmitting Member that is coupled by a Transmission Belt to another Cone with One Torque Transmitting Member for which teeth re-engagement between the Torque Transmitting Members and their Transmission Belt is improved. Said CVT uses a slack-side Tensioning Pulley in order to maintain the tension in the slack-side of the Transmission Belt almost constant so as to ensure smooth re-engagement of the Driven Cone; and a Transmission Diameter Compensating Mechanism, which increases the Transmission Diameter of the Driving Cone when the torque being pulled by the Driving Cone is increased, in order to compensate for an increase in Transmission Belt Teeth Compression and an increase in stretching of the tense-side of the Transmission Belt, due to an increase in tension in the tense-side of the Transmission Belt when an increased torque is transmitted; to ensure smooth re-engagement of the Driving Cone.

A toothed CVT using a Cone with One Torque Transmitting Member that is coupled by a Transmission Belt to another Cone with One Torque Transmitting Member for which teeth re-engagement between the Torque Transmitting Members and their Transmission Belt is improved. Said CVT uses a slack-side Tensioning Pulley in order to maintain the tension in the slack-side of the Transmission Belt almost constant so as to ensure smooth re-engagement of the Driven Cone; and a Transmission Diameter Compensating Mechanism, which increases the Transmission Diameter of the Driving Cone when the torque being pulled by the Driving Cone is increased, in order to compensate for an increase in Transmission Belt Teeth Compression and an increase in stretching of the tense-side of the Transmission Belt, due to an increase in tension in the tense-side of the Transmission Belt when an increased torque is transmitted; to ensure smooth re-engagement of the Driving Cone.

A toothed CVT using a Cone with One Torque Transmitting Member that is coupled by a Transmission Belt to another Cone with One Torque Transmitting Member for which teeth re-engagement between the Torque Transmitting Members and their Transmission Belt is improved. Said CVT uses a slack-side Tensioning Pulley in order to maintain the tension in the slack-side of the Transmission Belt almost constant so as to ensure smooth re-engagement of the Driven Cone; and a Transmission Diameter Compensating Mechanism, which increases the Transmission Diameter of the Driving Cone when the torque being pulled by the Driving Cone is increased, in order to compensate for an increase in Transmission Belt Teeth Compression and an increase in stretching of the tense-side of the Transmission Belt, due to an increase in tension in the tense-side of the Transmission Belt when an increased torque is transmitted; to ensure smooth re-engagement of the Driving Cone.

A Flexible Ramp for a Cone Assembly that uses a Torque Transmitting Member; said Cone Assembly uses a Transmission Belt that has its teeth shaped below its belt. Said Flexible Ramp can ideally raise a Leveling Extension of said Torque Transmitting Member or a Non-Torque Transmitting Member from a base surface of a Cone of said Cone Assembly to a raised surface of said Cone, for all pitch diameters of said Cone Assembly. When said Leveling Extension is positioned on a raised surface, it can support the teeth of said Transmission Belt; even-though the teeth of said Torque Transmitting Member have tooth bases, and said Non-Torque Transmitting Member has a base surface for the teeth of said Transmission Belt; since the thickness of said tooth bases and said base surface can be compensated by the height of the raised surface on which said Leveling Extension is positioned.

A Flexible Ramp for a Cone Assembly that uses a Torque Transmitting Member; said Cone Assembly uses a Transmission Belt that has its teeth shaped below its belt. Said Flexible Ramp can ideally raise a Leveling Extension of said Torque Transmitting Member or a Non-Torque Transmitting Member from a base surface of a Cone of said Cone Assembly to a raised surface of said Cone, for all pitch diameters of said Cone Assembly. When said Leveling Extension is positioned on a raised surface, it can support the teeth of said Transmission Belt; even-though the teeth of said Torque Transmitting Member have tooth bases, and said Non-Torque Transmitting Member has a base surface for the teeth of said Transmission Belt; since the thickness of said tooth bases and said base surface can be compensated by the height of the raised surface on which said Leveling Extension is positioned.

A Flexible Ramp for a Cone Assembly that uses a Torque Transmitting Member; said Cone Assembly uses a Transmission Belt that has its teeth shaped below its belt. Said Flexible Ramp can ideally raise a Leveling Extension of said Torque Transmitting Member or a Non-Torque Transmitting Member from a base surface of a Cone of said Cone Assembly to a raised surface of said Cone, for all pitch diameters of said Cone Assembly. When said Leveling Extension is positioned on a raised surface, it can support the teeth of said Transmission Belt; even-though the teeth of said Torque Transmitting Member have tooth bases, and said Non-Torque Transmitting Member has a base surface for the teeth of said Transmission Belt; since the thickness of said tooth bases and said base surface can be compensated by the height of the raised surface on which said Leveling Extension is positioned.

A Flexible Ramp for a Cone Assembly that uses a Torque Transmitting Member; said Cone Assembly uses a Transmission Belt that has its teeth shaped below its belt. Said Flexible Ramp can ideally raise a Leveling Extension of said Torque Transmitting Member or a Non-Torque Transmitting Member from a base surface of a Cone of said Cone Assembly to a raised surface of said Cone, for all pitch diameters of said Cone Assembly. When said Leveling Extension is positioned on a raised surface, it can support the teeth of said Transmission Belt; even-though the teeth of said Torque Transmitting Member have tooth bases, and said Non-Torque Transmitting Member has a base surface for the teeth of said Transmission Belt; since the thickness of said tooth bases and said base surface can be compensated by the height of the raised surface on which said Leveling Extension is positioned.