RESEARCH ON USING HYDRAULIC TRANSMISSION SYSTEMS IN FOUR WHEELERS

Hydraulic transmission systems have been used to power applications involving high torque demands and reliability. In recent years, when the automobile industry started to focus on efficiency Its (hydraulic and also pneumatic) working characteristics are found to be more ideal for modern automobile power-train system rather than just in transmission of torque to the wheels. However its full capabilities of being a versatile component in modern power train systems are not still designed engineered and employed to meet conventional automobile applications. This paper is to prove the following innovative (not known to exist) concepts involving hydraulic transmission technique to have multiple purpose applications in power trains of heavy automobiles where reliability and demand for torque are usually high. The concepts involve- Hydraulic Automobile differential (with easy differential lock), Hydraulic All-wheel drive with adaptive differential lock, Two wheel drive hydraulic valve controlled variable transmission, All-wheel drive hydraulic valve controlled variable transmission, Hydraulic regenerative retardation, Hydraulic regenerative braking (known to exist), Initial torque boosting concept and hydraulic steering by reverse differential action. Most of the above concepts are not known to exist but the base principle of such transmissions' working is confirmed to be more effective for heavy duty automobiles involving high torque demands, Recently, by the leading auto industries who have also projected in hydraulic hybrids and have registered up to 60-70% of net fuel consumption of an average truck that can be saved by implementing SHEP (Stored Hydraulic Energy Propulsion) (In its power train), which is an integrated part in two of our above concepts.