What gear runs both pumps in an automatic transmission? - Hydraulic pump|Swing Motor|Hydraulic motor manufacturing

What gear runs both pumps in an automatic transmission?

In an automatic transmission, the gear that primarily drives both the hydraulic pump and the lubrication pump is typically the torque converter. The torque converter is connected to the engine's crankshaft, and it spins at the same speed as the engine. As the engine runs, the torque converter uses fluid dynamics to transmit power to the transmission gears and also drives the transmission's pumps. Specifically, the impeller within the torque converter is what drives the pumps, supplying the hydraulic pressure required to shift gears and providing lubrication to various transmission components. This centralized system ensures synchronized operation and is crucial for the transmission's performance.

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In an automatic transmission, the crucial element that drives both the hydraulic pump and the lubrication pump is generally not a “gear” in the traditional sense, but rather the torque converter. The torque converter is a fluid coupling that connects the engine to the transmission and plays a critical role in transferring power from the engine to the wheels.

The torque converter is mounted directly to the engine’s crankshaft and rotates at the same speed as the engine itself. Within the torque converter, you’ll find an impeller, which is connected to the engine, and a turbine, which is connected to the transmission. When the engine runs, the impeller spins, pushing transmission fluid and causing the turbine to spin as well. This action not only transfers rotational power to the transmission but also powers the hydraulic pump and often the lubrication pump as well.

The hydraulic pump is an essential component in an automatic transmission, supplying the hydraulic pressure necessary to operate the clutches and bands that control the planetary gear sets, allowing for gear changes. A failure in this pump or a drop in hydraulic pressure can lead to transmission failure, emphasizing its importance in the system.

The lubrication pump, on the other hand, ensures that all moving parts in the transmission are adequately lubricated. Proper lubrication reduces friction, minimizes wear, and extends the lifespan of the transmission. The lubrication pump usually works in tandem with the hydraulic pump, using the same rotational power source supplied by the torque converter.

The torque converter’s ability to match the engine’s RPM to hydraulic pump and lubrication pump requirements is vital for the overall functionality and efficiency of the automatic transmission system. This centralized drive system allows for synchronized operation between the engine and the transmission, providing smoother gear shifts and better fuel efficiency. Additionally, it simplifies the mechanical layout, eliminating the need for separate drives for each pump, thus reducing the complexity and the chances of failure.

To sum up, while it may not be a “gear” in the traditional sense, the torque converter serves as the central hub that drives both the hydraulic pump and the lubrication pump in an automatic transmission. It does so by being directly connected to the engine’s crankshaft, thus ensuring that both pumps are operational whenever the engine is running, maintaining hydraulic pressure and lubrication essential for the automatic transmission to function correctly.

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