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Transmission Oil Pump for Gear Shifting

Transmission Oil Pump for Gear Shifting

The Lubrication Oil Pump is the power source of the entire hydraulic system of an automatic transmission, and is generally directly driven by the engine. All automatic transmissions have a front pump driven by the engine, and some transmissions also have a rear pump driven by the output shaft. The functions of these two pumps are to provide a certain flow and pressure of hydraulic oil required by the transmission. The specific functions are as follows:

Dual Oil Pump for DHT Transmission

Dual Oil Pump for DHT Transmission

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.

Hydraulic Oil Pump for Transmission

Hydraulic Oil Pump for Transmission

The automatic transmission oil pump, also known as the gear pump, plays a very important role in the automatic transmission and is one of the most important assemblies of the automatic transmission.

Hydraulic Transmission Oil Vane Pump CVT

Hydraulic Transmission Oil Vane Pump CVT

In the early stages of the development of automatic transmissions, dual pumps were used in automatic transmissions. They were used to transfer the front and rear of the transmission, with the front pump driven by the engine and the rear pump driven by the output shaft. The function of the rear pump is to maintain the lubricating oil pressure of the system or ensure that the vehicle can be started by pushing the cart when the front pump cannot drive and supply oil when the engine fails. However, with the development of the automotive industry, the volume of the engine compartment is becoming smaller and smaller, while the engine is becoming larger and larger, which requires that the gearbox be as small as possible. Therefore, the automatic transmission gradually eliminated the rear pump. In the 1940s and 1980s, internal meshing involute quantitative gear pumps with crescent shaped partitions were generally used; In the 1980s, rotor pumps and variable vane pumps were introduced; In the 1990s, quantitative pumps with different tooth shapes were introduced, including internal meshing cycloidal pumps and dual center internal meshing pumps.

Mechanical Oil Pump for DHT Transmission

Mechanical Oil Pump for DHT Transmission

As the capacity and voltage of the on-board battery gradually increase, the degree of electrification of the Transmission Oil Pump will further deepen, especially in plug-in hybrid vehicles. As the engine only intervenes when necessary, most of the time it is driven by pure electricity, and at this time, the Lubrication Oil Pump takes on the main work, so the mechanical oil pump can be eliminated and completely adopted.

Automatic Transmission Oil Pump with Gear Driving

Automatic Transmission Oil Pump with Gear Driving

Automatic transmissions, especially those with electrohydraulic control as the main means, are controlled by the hydraulic system during their operation. As an important component of the hydraulic system, the oil pump is the heart of the hydraulic system, providing a continuous stream of power for the hydraulic system, providing hydraulic oil for components such as hydraulic torque converters, hydraulic actuators, control valves, and also providing lubrication and cooling oil for components such as clutches and gears.

Transmission Oil Pump for DCT

Transmission Oil Pump for DCT

Automatic transmission, especially the transmission with electro-hydraulic control, all actions are mainly realized through the control of the hydraulic system.

Lubrication Oil Pump for Transmission CHERY

Lubrication Oil Pump for Transmission CHERY

Currently, most traditional automatic transmissions use mechanical oil pumps, such as the Volkswagen DQ380 transmission. The power of the mechanical oil pump comes from the engine. As long as the engine is running, the automatic Transmission Oil Pump is in operation and outputs pressure oil.

Cooling Oil Pump for Transmission

Cooling Oil Pump for Transmission

Since the power of the mechanical oil pump comes entirely from the engine, if we turn off the engine while the vehicle is in motion, the components inside the transmission will not receive adequate lubrication and cooling, which can damage the transmission.

Transmission Oil Pump for 7DCT

Transmission Oil Pump for 7DCT

Mechanical oil pump includes external gearing, internal gearing and vane pump according to its internal structure. It is the core component and power source in the automatic Transmission System, mainly providing the transmission a certain flow and pressure to realizes functions such as start-stop, gear shifting, lubrication, cooling, auxiliary lubrication, energy storage and so on. It's popularly used for new energy vehicles or hybrid transmissions.

Internal Gearing Transmission Oil Pump DHT

Internal Gearing Transmission Oil Pump DHT

According to whether the displacement of the oil pump can be changed, automotive automatic transmission oil pumps can be divided into quantitative pumps and variable displacement pumps. Common definitions

Master Hydraulic Pump Transmission DHT

Master Hydraulic Pump Transmission DHT

Figure 1 shows an involute internal meshing Gear Pump with a crescent shaped partition, with a pressure angle of 20-30 degrees for the involute tooth shape. The center of the driving outer gear and the driven inner gear is arranged eccentrically. Due to the difference in the number of teeth between the driving gear and the driven gear being greater than 2, there is a one-month tooth shaped partition between the oil suction port and the oil outlet port, forming a seal for the high-pressure and low-pressure chambers. The output flow of the Lubrication Oil Pump depends on the pitch diameter and tooth width of the gear. For a given pitch diameter oil pump, the smaller the number of teeth, the greater the output flow.

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