초록 ▼

A dual pumping element fluid system for an engine or other system which reduces the driving power consumption by unloading one pumping element through the use of recirculation when a fluid pressure target value is achieved. A cross-over port fluid system prevents cavitation of the unloaded pump. A p

A dual pumping element fluid system for an engine or other system which reduces the driving power consumption by unloading one pumping element through the use of recirculation when a fluid pressure target value is achieved. A cross-over port fluid system prevents cavitation of the unloaded pump. A pressure-activated flow control valve mechanism is utilized to open and close the conduits from the secondary pump. The fluid system works in conjunction with an engine balance shaft system to control gear rattle at low speeds without adding undue gear loads at high speeds.

대표청구항 ▼

[ What is claimed is:] [12.] An engine balancer apparatus within an engine comprising:a first rotary balance shaft:a second rotary balance shaft;means for drivingly connecting the balance shafts to a crankshaft of an engine for rotation in a predetermined speed relationship with the crankshaft;a fir

[ What is claimed is:] [12.] An engine balancer apparatus within an engine comprising:a first rotary balance shaft:a second rotary balance shaft;means for drivingly connecting the balance shafts to a crankshaft of an engine for rotation in a predetermined speed relationship with the crankshaft;a first fluid pump in communication with a driving shaft having a fluid inlet that communicates with a fluid reservoir and an outlet that communicates with a load;a second fluid pump driven by said second rotary balance shaft, said second fluid pump having a fluid inlet that communicates with a fluid reservoir and an outlet that communicates with a load;a flow control valve interconnecting said first and second pumps;whereby when the pressure in the engine is below a predetermined threshold, said flow control valve operates to enable both said first and second pumps to supply the load;whereby when the pressure in the engine reaches said predetermined threshold, said flow control valve starts to close said second pump inlet and outlet and starts to open a short circuit conduit so that fluid recirculates within said short circuit conduit and is prevented from supplying the load; andwhereby when the pressure in the engine is above said predetermined threshold, said valve fully closes said inlet and outlet of said second pump and said short circuit conduit is fully opened.