3 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%.

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.