Exam 21: Continuously Variable Transmissions

Technician A says a variable-diameter pulley (VDP) system operates using two variable diameter pulleys with either steel or a rubber belt between them. Technician B says the rubber belt operates much quieter than a steel belt, so most vehicle manufacturers use them. Who is correct?

Technician A says the steel belt used in a variable diameter pulley continuously variable transmission (CVT) is made up of hundreds of transversely mounted steel plates that are held in place with several steel bands. Technician B says the transverse steel plates slip on the sides of the pulley and in turn are pulled by the pulley. Who is correct?

Technician A say the most common type of continuously variable transmission (CVT) today is the variable-diameter pulley transmission. Technician B says the variable-diameter pulley (VDP) has two pulleys with movable drive faces that can be adjusted to change the pulley's effective diameter. Who is correct?

Technician A say the most common type of continuously variable transmission (CVT) today is the variable-diameter pulley transmission. Technician B says the variable-diameter pulley (VDP) has two pulleys with movable drive faces that can be adjusted to change the pulley's effective diameter. Who is correct?

Which type of continuously variable transmission operates using two variable-diameter pulleys with either a steel or rubber belt between them?

Technician A says the toroidal continuously variable transmission (CVT) is limited in production because of high manufacturing cost. Technician B says the toroidal, or roller, design uses two curved discs, an input disc and an output disc. Who is correct?

Tech A states that fluid pressure in a CVT should be checked with a transmission pressure gauge. Tech B states that pressures in a CVT will often exceed the range of a traditional gauge and will require the use of a pressure transducer. Who is correct?

In a variable-diameter pulley CVT, each of the pulleys has two movable drive faces called ________.

Technician A says typically, a variable-diameter pulley (VDP) gear ratio is 3:1 through the pulleys from a dead stop. Technician B says as the vehicle gains speed, the input pulley diameter increases, while the output pulley diameter decreases. Who is correct?

Technician A says belt tension on a variable-diameter pulley (VDP) is maintained by a large spring on the output shaft pulley. Technician B says the tension spring causes the sheaves of the output pulley to be close together, creating a larger diameter pulley. Who is correct?

Technician A says a variable-diameter pulley (VDP) system operates using two variable diameter pulleys with either a steel or a rubber belt between them. Technician B says the rubber belt has a limited service life in an automobile, so most manufacturers use them. Who is correct?

Technician A says that VDP CVT's use a steel belt made up of hundreds of transversely mounted steel plates. Technician B says that some VDP CVT's are programmed to give the feel of shift points. Who is correct?

Which of the following transmissions typically has no fixed gear ratios?

Continuously Variable Transmissions (CVTs) require a special type of transmission fluid.

Technician A says typically, a variable-diameter pulley (VDP) gear ratio is 3:1 through the pulleys from a dead stop. Technician B says as the vehicle gains speed, the input pulley diameter increases, while the output pulley diameter decreases. Who is correct?

Technician A says that a typical CVT belt can cost up to $750. Technician B says that when disassembling a sheave, if the fluid is badly contaminated, the entire variator assembly should be rebuilt. Who is correct?

Technician A says typically, a variable-diameter pulley (VDP) gear ration is 3:1 through the pulleys from a dead stop. Technician B says as the vehicle gains speed, the input pulley diameter increases, while the output pulley diameter decreases. Who is correct?

Technician A says belt tension on a variable-diameter pulley (VDP) system is maintained by a large spring on the output shaft pulley. Technician B says the tension spring on a variable-diameter pulley (VDP) system causes the sheaves of the output pulley to be close together, creating a larger diameter pulley. Who is correct?

Technician A says that a sheave should be inspected for any wear marks. Technician B says that if there are any groves in a sheave it can cause the belt to get stuck on the groove. Who is correct?

Technician A says typically, a variable-diameter pulley (VDP) gear ration is 3:1 through the pulleys from a dead stop. Technician B says as the vehicle gains speed, the input pulley diameter increases, while the output pulley diameter decreases. Who is correct?