61results about How to "Continuously variable" patented technology

The invention discloses an air intake valve lift-variable system in an air intake pressure regulating type, belonging to the technical field of internal combustion engines. The system comprises an air intake channel, an air exhaust channel, an air intake valve lower section, an air exhaust valve, an air intake valve upper section, a capacity cavity, a movable body, a perforation pipe, a movable block, an air inlet pipe, a connecting pipe and a spring, wherein the movable body is mounted in the capacity cavity and is contacted with the inner wall face of the capacity cavity in a sealing manner; the perforation pipe perforates the upper wall face and the lower wall face of the movable body; the movable block is mounted in the perforation pipe and is contacted with the inner wall face of the perforation pipe in a sealing manner; the lower end face of the movable block is a plane; the upper end face of the movable block is an inclined face; two ends of the connecting pipe are communicated with the left wall faces of the air intake pipe and the capacity cavity; the right wall face of the movable body is connected with the right wall face of the capacity cavity through the spring; when pressure in the air intake pipe is relatively large, the movable body is moved to right; the air intake valve lift is increased; when the pressure in the air intake pipe is relatively small, the movable body is moved to left; the air intake valve lift is reduced; and the intake valve variable-lift system is characterized by reasonable design and simple structure and is suitable for engine valve lift-variable systems.

The invention discloses an upper-section sliding device for a mechanical valve in the technical field of the mechanical design. The upper-section sliding device for the mechanical air valve comprises an inlet channel, an outlet channel, a lower section of an inlet valve, an exhaust valve, an upper section of the inlet valve, a volume cavity, moving bodies, a through tube, moving blocks, a connecting tube and a spring, wherein the lower end surface of the first moving block and the lower end surface of the second moving block are both planes; the upper end surface of the first moving block and the upper end surface of the second moving block are both slopes; and the right wall surface of the first moving body is connected with the left wall surface of the second moving body via the spring. When pressure in the exhaust tube of the an engine is bigger, the first moving body moves leftwards, the second moving body moves rightwards, and the lifts of the inlet valve and the exhaust valve are largenedned; and when the pressure in the exhaust tube of the engine is smaller, the first moving body moves rightwards, the second moving body moves leftwards, and the lifts of the inlet valve and the exhaust valve are reduced. The upper-section sliding device disclosed by the invention has the advantages of reasonability in design and simple structure and is suitable for the lift variable system of the engine.

The invention discloses a broadband receiver front-end circuit with a continuously adjustable bandwidth. The circuit comprises a low noise amplifier, a main mixer, a transconductance stage circuit, a transimpedance amplifier and an output buffer stage circuit and a feedback loop, wherein the low noise amplifier amplifies a radio frequency signal, the amplified radio frequency signal is converted by the main mixer into a medium frequency voltage signal, the transconductance stage circuit converts the medium frequency voltage signal into a current signal, the current signal is converted by the transimpedance amplifier into a voltage signal, and the voltage signal is output to an off-chip digital chip through the output buffer stage circuit for processing after being amplified and filtered; and the feedback loop amplifies the value of a high-pass filter capacitor in the feedback loop through the Miller effect of a loop amplifier, thereby not only realizing the clutter filtering of the medium frequency voltage signal, but also omitting a medium frequency filter capacitor. The broadband receiver front-end circuit disclosed by the invention effectively reduces the overall area of the chip, can realize the continuously adjustable bandwidth, and can also further reduce the equivalent on-resistance of the mixer and inhibit out-of-band interference signals.

The invention relates to the technical field of an internal combustion engine, in particular to a device for adjusting a lift of an intake valve of a supercharged engine. The device comprises an intake channel, an exhaust channel, a lower intake valve section, an exhaust valve, an upper intake valve section, a volumetric cavity, a moving body, a penetrating tube, a moving block, a connecting tube and a spring, wherein the moving body is arranged in the volumetric cavity and is contacted with the inner wall surface of the volumetric cavity in a sealing way, the penetrating tube is arranged in a way of penetrating the upper wall surface and the lower wall surface of the moving body, the moving block is arranged in the penetrating tube and is contacted with the inner wall surface of the penetrating tube in a sealing way, a plane is adopted by the lower end face of the moving block, a slope is adopted by the upper end face of the moving block, two ends of the connecting tube are respectively communicated with the left wall surfaces of an intake tube and the volumetric cavity, and the right wall surface of the moving body is connected with the right wall surface of the volumetric cavity through the spring. When the pressure in an exhaust tube of the engine is relatively high, the moving body can move rightwards, and the lift of the intake valve can be increased; and when the pressure in the exhaust tube of the engine is relatively low, the moving body can move leftwards, and the lift of the intake valve can be decreased. The device has the advantages of reasonable design and simple structure and is suitable for a variable valve lift system of the supercharged engine.