When the clutch reaction plates are splined directly to the inside of the transmission case and the friction plates are splined to the component we want to hold, this type of clutch is called a ___________ clutch.

When the clutch reaction plates are splined directly to the inside of the transmission case and the friction plates are splined to the component we want to hold, this type of clutch is called a ___________ clutch.

• A. Roller- or sprag-type one-way clutch
• B. Sprag-type one-way clutch
• C. Rotating
• D. Stationary

Answer: (D)

In a multi-plate clutch, which parts are fixed to the case versus the part being driven determines whether it’s considered stationary or rotating. If the reaction plates are splined to the inside of the transmission case, they’re fixed to the housing and act as the stationary reaction member. If the friction plates are splined to the component you want to hold, then when the clutch engages, torque is transmitted with the case acting as the stationary reference while the held component is driven relative to the case. This setup is described as a stationary clutch. The other option about a one-way clutch refers to different behavior (one-way engagement with sprags or rollers) and doesn’t apply to this case where the case itself provides the fixed reaction.

In a multi-plate clutch, which parts are fixed to the case versus the part being driven determines whether it’s considered stationary or rotating. If the reaction plates are splined to the inside of the transmission case, they’re fixed to the housing and act as the stationary reaction member. If the friction plates are splined to the component you want to hold, then when the clutch engages, torque is transmitted with the case acting as the stationary reference while the held component is driven relative to the case. This setup is described as a stationary clutch. The other option about a one-way clutch refers to different behavior (one-way engagement with sprags or rollers) and doesn’t apply to this case where the case itself provides the fixed reaction.