HOME > PRODUCT INFORMATION >Valve Train Related Parts Place your mouse pointer, then products name appears.   The mechanism that opens and closes the engine valves is called the valve train, and its components are called valve train parts. The quest for stronger and lighter valve train parts, manufactured to ever-higher tolerances, never ends. With the goal of producing high quality engines, we at NPR are focusing our efforts on enhancing both functionality and quality. 　Valve seat inserts 　Camshafts 　Others Composite valve seat insert The “Valve seat insert”, which is press-fitted into valve seating face part with cylinder head, is made of sintered alloy. This is important parts, which require durability that there is no deterioration by hitting at high temperature and which require high gas tightness that combustion gas is sealed certainly. NPR has offered the superior valve seat insert which meets high level of requirements of engines, making use of abundant material variation and material development power. Return to top of the page The P/M camshaft, boasting many features such as light weight, high contact pressure resistance, and narrow cam spacing, is a unique, patented product available only from NPR. It is manufactured by sintering the alloy steel cam lobes onto a steel tube. Journal parts are made by diffusion bonding sintered materials into one piece, bonding steel materials with copper brazing, or using a part of tube as a journal, processes that are customizable to meet the individual design specifications of the engines. As cam lobes that high hardness is required, there are chilled cam, which has the rapid cooling hardening the top part at casting, the hardening cam, and chill cam hardening at the chilled part. Return to top of the page ●Valve rocker arm   ● Valve lifter / Valve guide / Rocker bridge   This is parts which intermediate the opening and closing of the valve between cam and valve. At the contact part with cam, the tip with the sintering alloy is composited to the body of aluminum. In recent years, roller rocker arm that the roller is built-in is widely used to reduce the friction.   These valve train parts are produced with tribology technology of NPR’s strong point. Particularly, valve lifter that the sintering tip is sinter bonded shows an outstanding effect on performance improvement.   Power Train Related Parts Valve Train Related Parts Diversifying products
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