A power unit includes a prime mover and a belt continuously variable transmission. The belt continuously variable transmission includes a drive pulley, a driven pulley, a belt wound around the drive pulley and the driven pulley, and a housing forming an accommodation space in which the belt is disposed. The belt continuously variable transmission changes a speed of rotation produced by drive power output from the prime mover. The power unit further includes a temperature sensor configured to detect a temperature of the belt or a temperature corresponding to the temperature of the belt.

In a hydraulic control device switchable between a first state in which a first oil is supplied from a first pump to a hydraulic operation part via a bypass valve and a second state in which the first oil supplied from the first pump is pressurized by using the second pump and the pressurized first oil is supplied, as a second oil, to the hydraulic operation part, control that adds a correction hydraulic pressure of a predetermined amount to the hydraulic pressure of the oil discharged from a valve for adjusting the pressure of the oil supplied to the hydraulic operation part is performed when the second state is switched to the first state due to a stop or a low rotation state of the second pump.

A method for controlling a continuously variable transmission including a primary oil chamber, a secondary oil chamber, an oil pump provided in an oil passage between the primary oil chamber and a secondary oil chamber. The method including determining whether a required downshift speed is faster than an allowable value; setting a target piston position of the primary oil chamber; setting a target oil pressure of the primary oil chamber; and increasing priority of a position feedback control based on the target piston position in the setting of the target piston position when it is determined that the downshift speed is slower than the allowable value and increasing priority of a hydraulic feedback control based on the target oil pressure in the setting of the target oil pressure when it is determined that the downshift speed is faster than the allowable value.

A method for controlling a continuously variable transmission is a control method for controlling in/out of oil to/from a primary oil chamber by using an oil pump provided in an oil passage between the primary oil chamber and a secondary oil chamber. The method includes: a determination step of determining whether a required downshift speed is faster than an allowable value; a position control step of setting a target piston position of the primary oil chamber in accordance with an operating state of a vehicle and performing a position control of a piston of the primary oil chamber based on the target piston position; a hydraulic control step of setting a target oil pressure of the primary oil chamber in accordance with the operating state and performing a hydraulic control of the primary oil chamber based on the target oil pressure; and a feedback setting control step of increasing weighting according to a position feedback control based on the target piston position in the position control step when it is determined that the downshift speed is slower than the allowable value in the determination step and of increasing weighting according to a hydraulic feedback control based on the target oil pressure in the hydraulic control step when it is determined that the downshift speed is faster than the allowable value.

A continuously variable transmission for a vehicle includes a drive clutch, a driven clutch operably coupled to the drive clutch, and a belt extending between the drive and driven clutches. The continuously variable transmission also includes an inner cover and an outer cover removably coupled to the inner cover. At least one of the inner and outer covers includes an air inlet for providing cooling air to the drive and driven clutches and the belt.

A continuously variable transmission for a vehicle includes a drive clutch, a driven clutch operably coupled to the drive clutch, and a belt extending between the drive and driven clutches. The continuously variable transmission also includes an inner cover and an outer cover removably coupled to the inner cover. At least one of the inner and outer covers includes an air inlet for providing cooling air to the drive and driven clutches and the belt.

A continuously variable transmission for a vehicle includes a drive clutch, a driven clutch operably coupled to the drive clutch, and a belt extending between the drive and driven clutches. The continuously variable transmission also includes an inner cover and an outer cover removably coupled to the inner cover. At least one of the inner and outer covers includes an air inlet for providing cooling air to the drive and driven clutches and the belt.

A continuously variable transmission for a vehicle includes a drive clutch, a driven clutch operably coupled to the drive clutch, and a belt extending between the drive and driven clutches. The continuously variable transmission also includes an inner cover and an outer cover removably coupled to the inner cover. At least one of the inner and outer covers includes an air inlet for providing cooling air to the drive and driven clutches and the belt.

A continuously variable transmission for a vehicle includes a drive clutch, a driven clutch operably coupled to the drive clutch, and a belt extending between the drive and driven clutches. The continuously variable transmission also includes an inner cover and an outer cover removably coupled to the inner cover. At least one of the inner and outer covers includes an air inlet for providing cooling air to the drive and driven clutches and the belt.

A continuously variable transmission for a vehicle includes a drive clutch, a driven clutch operably coupled to the drive clutch, and a belt extending between the drive and driven clutches. The continuously variable transmission also includes an inner cover and an outer cover removably coupled to the inner cover. At least one of the inner and outer covers includes an air inlet for providing cooling air to the drive and driven clutches and the belt.