Dual Oil Pump for DHT Transmission

Automatic Transmission Oil Pump
The design requirements for automotive automatic transmission oil pumps are: to meet the pressure and flow requirements, the volume should be as small as possible, the energy consumption should be as low as possible, the noise should be as small as possible, and the reliability should be as high as possible.
The oil pumps used in automatic transmissions are all positive displacement oil pumps. Its principle is that when the sealing volume changes from small to large, the sealing volume decreases internally, and the liquid at the oil inlet enters the sealing volume under the action of external pressure (usually atmospheric pressure). When the sealing volume changes from large to small, the pressure within the sealing volume increases, squeezing the hydraulic oil within the sealing volume out of the oil outlet.

Critical parameters:

Oil pump location:

The automatic transmission oil pump is located inside the gearbox, so when transmission specialists have to deal with the oil pump issues they have to tear down the transmission and remove the bellhousing from the transmission. When performing these operations it is required to take into account the design peculiarities of each particular car and specific modifications of automatic transmissions. Therefore, it’s better to leave this tricky task for experienced specialists who can quickly determine the oil pump location and perform all necessary repair procedures in the shortest possible time.

Oil pump assembly

After the examination and repair procedures, it is necessary to assemble the automatic transmission oil pump. The assembly is performed in the following order:

-Install the inner and outer gears in the pump body one-by-one;

-Adjust the shaft to the holes of fastening bolts;

-Screw in bolts and carefully tighten them;