Hydraulic Retarder for Truck Transmission

Advantages of hydraulic retarders
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.

Retarder controller function:

- Brake indication: When the retarder is braking, the main vehicle brake light illuminates to remind the rear vehicle to pay attention

- Cooling coordination: According to relevant control strategies, the fan gear can be directly or indirectly controlled to enhance the water cooling capacity

- Temperature protection: The retarder oil temperature and water temperature signal exceeds the limit due to vehicle overload or other faults

- Graded braking function: 4 brake gears for graded deceleration braking of the entire vehicle

- ABS coordination: When the ABS operates, the retarder stops working

- Combined braking: realize combined braking with exhaust braking and engine braking

- Work indication: indicates the working status of the retarder

- Constant speed function: The retarder automatically adjusts the braking force according to the change of downhill slope to ensure the constant speed of the entire vehicle

Feedback on problems in the field of retarders and corrective and preventive measures:

1. Is it difficult to disassemble the retarder and interfere with the transmission shaft?

Solution: Design to reduce the overall size of the retarder, increase the spacing between the retarder and the transmission shaft, and facilitate installation and maintenance

2. During operation, individual electromagnetic proportional valves may become stuck, affecting the use of the retarder?

Solution: Due to impurities entering the air inlet of the proportional valve during the modification process, a filter screen is designed and installed at the air inlet of the proportional valve.

3. After using about 200000 kilometers, did you find that the braking torque of the retarder has decreased somewhat?

Solution: Normally, in order to ensure the continuous stability of the braking torque of the retarder, it is required to replace the oil once every 100000 kilometers. This problem can be solved by replacing with new oil.