7 results about "Overhead camshaft" patented technology

A sliding cavity is formed in a shell, a compression spring is installed in the sliding cavity, a piston is installed in the sliding cavity in a sliding fit mode, and the piston is ejected outwards under the action of the compression spring and abuts against a chain guide plate. A plurality of annular ratchet grooves are formed in the extending end of the piston, the adjacent ratchet grooves are connected, the ratchet spring comprises matching sections arranged in pairs, the matching sections are provided with outwards-protruding arc-shaped clamping parts, the arc-shaped clamping parts are clamped in the ratchet grooves, and protruding limiting blocks are arranged on the outer side wall of the shell and located in U-shaped grooves of the corresponding U-shaped sections. The cam shaft chain tensioning device has the beneficial effects that the cam shaft chain can be effectively tensioned, the abnormal noise generated by the chain can be effectively avoided in the cold starting process, after the cam shaft chain extends, the cam shaft chain tensioning device can adapt to the change of the length of the cam shaft chain through jumping of the ratchet spring, the tensioning force of the cam shaft chain is guaranteed, and the service life of the cam shaft chain is prolonged. Synchronous operation of the chain wheel and the chain is guaranteed.

The invention relates to the technical field of internal combustion engines, in particular to a hydrogen internal combustion automobile engine which comprises an air cylinder body, an air cylinder cover and a crank connecting rod mechanism. An exhaust hole is formed in one side of the cylinder body, the cylinder body is cast by adopting a nickel-based high-temperature alloy to form an in-line four-cylinder structure, and a plasma-sprayed ZrO2-Y2O3 composite ceramic layer is arranged on the surface of the cylinder wall; the valve timing mechanism comprises an overhead camshaft and a valve, and is equipped with a continuous variable valve timing system; the hydrogen injection system comprises a high-pressure hydrogen pipe, a multi-stage pressure reduction electromagnetic valve and an injection head, and the injection pressure range of the injection head is 5-35 MPa; the turbocharging system comprises a radial flow type turbine, an air inlet header pipe, an air inlet manifold and an electronic waste gas bypass valve, the nickel-based high-temperature alloy air cylinder body is combined with the plasma spraying ZrO2-Y2O3 composite ceramic layer, the temperature can be resisted to 1100 DEG C, the hydrogen embrittlement rate is reduced by 70%, the design of the hemispherical-pit composite combustion chamber and the circumferential turbulence groove is matched, and the performance of the engine is improved. The lean burn limit is expanded to lambda = 1.3, and the heat efficiency is improved to 45%.

The motor tricycle power system comprises an engine, an air distribution mechanism of the engine comprises an overhead cam shaft, and the axis of the overhead cam shaft deviates from the center line of an air cylinder body of the engine; according to the power system of the motor tricycle, the motor tricycle and the valve mechanism of the engine, the arrangement mode of the overhead cam shaft is adopted, compared with a lower cam shaft in the prior art, tappets and tappets do not need to be arranged, the reliability of the valve mechanism is improved, and therefore the reliability of the engine is improved, and meanwhile the stability and shock resistance of the whole motor tricycle are improved.

This utility model discloses a timing positioning fixture for assembling dual overhead camshafts, relating to the field of diesel engines. The timing positioning fixture includes a main body, a camshaft timing trihedron, and positioning bolt holes. The main body is used to position the dual overhead camshafts in the cylinder head. The main body consists of a first support frame and a second support frame, with their ends staggered. Each support frame has a chuck mounted below it. The camshaft timing trihedron is mounted on the end of the camshaft, and the chuck is adapted to fit the camshaft timing trihedron. This timing positioning fixture, even in confined spaces with a narrow front end of the cylinder head, engages the chucks of the first and second support frames with the camshaft timing trihedron, ensuring the camshaft is in the correct position and can withstand higher torque forces.

The invention belongs to the technical field of engines, and discloses a camshaft seat, a double-overhead-cam engine and a vehicle. An installation area is defined in the main shell, a lap joint beam is arranged in the installation area, the lap joint beam is sunken to form an air inlet cam groove and an exhaust cam groove, an air inlet cam shaft is in lap joint in the air inlet cam groove, an exhaust cam shaft is in lap joint in the exhaust cam groove, the air inlet cam shaft is parallel to the exhaust cam shaft, and the two sides of the lap joint beam are connected with the main shell. A first mounting hole is formed in the main shell, a rotating speed sensor is mounted in the first mounting hole, a second mounting hole is formed in the outer side of the main shell, a wire harness assembly penetrates through the second mounting hole, and the wire harness assembly comprises an oil sprayer wire harness; the problem that in the prior art, a camshaft seat is single in function, and consequently the integration degree of an engine is low is solved.

The air distribution mechanism comprises an air valve assembly, a rocker arm assembly and an overhead cam shaft, the overhead cam shaft is parallel to the crankshaft, the air valve assembly comprises a plurality of air inlet valves and a plurality of air outlet valves, and the rocker arm assembly comprises a plurality of air inlet valves and a plurality of air outlet valves. The overhead cam shaft is close to one of the intake valves and the exhaust valves and far away from the other intake valve and the exhaust valve, and the intake valves and the exhaust valves are driven to be opened and closed through a rocker arm assembly; according to the gas distribution mechanism adapting to the engine with the longitudinally-arranged crankshaft, the engine and the tricycle, the arrangement mode that the crankshaft is longitudinally arranged, the camshaft is arranged in an overhead mode and is parallel to the crankshaft can be met, meanwhile, the overall structure is novel and simple, the stability and reliability of the gas distribution mechanism are improved, and the overall reliability of the engine is higher.

A valve for an overhead cam engine includes a valve sleeve, a valve cylinder, and a valve spring. The valve sleeve is cylindrical and has an annular shoulder and ports designed to permit flow of fuel and gases into and out of an internal combustion chamber. The valve cylinder includes a cylindrical body and a top cap. The top cap includes a contact surface to be engaged by a cam lobe and an annular projection. The valve spring is positioned about the cylindrical body and between the annular projection and the annular shoulder. The valve spring is designed to expand and move the valve cylinder partially out of the valve sleeve to unblock the ports and open the valve. The valve spring is designed to be compressed to permit the cam lobe to move the valve cylinder into the valve sleeve to block the ports and close the valve.