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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.

Automatic Transmission Oil Pump for Lubrication

Automatic Transmission Oil Pump for Lubrication

The transmission auxiliary oil pump is the heart of the transmission oil. When the transmission oil circulates to the bottom, it can pressurize the oil from the bottom through the filter screen to the top. The following is the role of the engine oil pump:

Hydraulic Oil Pump for 9DCT

Hydraulic Oil Pump for 9DCT

The mechanical oil pump+electric auxiliary oil pump is also known as a dual pump system. Due to the fact that the power and flow requirements of the gearbox for hydraulic oil vary from time to time based on the load, with peaks and valleys. When there is only a mechanical oil pump, the mechanical oil pump will be designed according to the highest demand. Although there is a variable displacement oil pump, the power and displacement of the mechanical oil pump will still be too large, and in many cases this design will generate energy waste. After using an electric auxiliary oil pump, the power and displacement of the mechanical oil pump can be designed based on the basic load, with the displacement reduced by about 1/3. The peak load is supplemented by the electric auxiliary oil pump, which supplies oil as needed.

Hydraulic Retarder - Braking System

Hydraulic Retarder - Braking System

The automobile retarder energizes the excitation coil of the stator assembly through a control circuit to generate a magnetic field. The rotor assembly rotates at high speed with the vehicle transmission part, cutting magnetic lines of force, generating reverse torque, and slowing the vehicle.

Hydraulic Intarder - Braking System

Hydraulic Intarder - Braking System

In order to adapt to the development of the medium and heavy truck market and meet the auxiliary braking needs of the entire vehicle in terms of safe driving, DARE AUTO began to establish a Hydraulic Retarder product research and development team in the North American R&D Center in 2012 and collect relevant product research and development data. The main members of the team are technical engineer from Europe and North America who has lots of experiences in hydraulic retarder product engineering. It has taken nearly 10 years to develop a hydraulic retarder suitable for matching heavy trucks with the mature research and development experience of European hydraulic retarder products. After nearly a decade of development, it has now been iteratively updated to the second generation of products, at the same level as well-known foreign brands. It has independent intellectual property rights and has applied for 22 patents, including 6 invention patents and 1 appearance patent.

Hydraulic Retarder - Heavy Truck

Hydraulic Retarder - Heavy Truck

The hydraulic retarder is a hydraulic device that reduces the traveling speed of a vehicle. It is generally composed of the retarder body, control device, electronic control unit, and other components. In the retarder body structure, the rotor and stator jointly constitute a working chamber. When the hydraulic retarder is operating, the electronic control system controls the proportional valve to apply air pressure to the working fluid to fill the working chamber. 

Braking Retarder for Truck

Braking Retarder for Truck

The stator is integrated with the retarder housing and connected to the rear end or frame of the transmission. The rotor is connected to the transmission shaft through a hollow shaft, and blades are cast on both the rotor and stator. During operation, pressure is applied to the oil pool through the operation of the control valve to fill the working fluid into the working cavity between the rotor and stator. When the rotor rotates, a torque is applied to the stator through the working fluid, and the reverse torque of the stator becomes the braking torque of the rotor. Its value depends on the amount of fluid and pressure in the working chamber (determined according to the brake strength gear set by the control valve), as well as the rotational speed of the rotor. The kinetic energy of the vehicle is consumed by the friction of the working fluid and the impact on the stator, which is converted into heat energy, causing the temperature of the working fluid to rise. Work is also introduced into the heat exchange cycle flow, which transfers heat to cooling water and dissipates it through the engine cooling system. In vehicles with hydraulic transmission, oil pools, oil pumps, heat exchangers (which need to be enlarged in size), and working fluids that utilize hydraulic transmission can be eliminated. Therefore, hydraulic retarders are mostly used in hydraulic transmission vehicles.

Hydraulic Retarder for Truck Transmission

Hydraulic Retarder for Truck Transmission

The retarding efficiency is higher than that of the engine retarding device, and it can drive downhill at relatively high speeds; Small size and mass, can be integrated with the transmission; No wear occurs during operation; The heat generated by the working fluid is easily transmitted and dissipated, and can maintain the normal operating temperature of the engine during long downhill runs; When braking at low speeds, the braking torque tends to zero, and the wheels do not slip when braking on slippery roads. The disadvantage is that the coupling and separation lag time is long, and there is power loss when not working. When used in mechanical transmission vehicles, especially in trailers, the structure is complex.

Electric Water Pump EWP

Electric Water Pump EWP

DARE Changzhou, a wholly-owned subsidiary of DARE AUTO, is subordinate to the Thermal Management Division, specializing in the research and development and production of automotive Electric Water Pump and brushless motor. The company is located in Luoxi Town, Xinbei District, Changzhou, with a plant area of 150,000 m2. DARE Changzhou has semi-automatic production lines and fully automated production lines, with a total production capacity of 1 million units.

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