Rocker arms
WHAT, HOW, WHY?
Rocker arms enable the functioning of a 4-valve cylinder with a single distribution shaft.
They are used to control the valves in 4-stroke engines. Generally, these components are made of steel obtained from mould steel and an incorporated slide is used that used to be coated with a surface layer of hard chrome while now DLC coating is used. However, in some cases a roller is used to minimise the friction (that from sliding becomes rolling).
Usually, the end of the rocker arm in contact with the valve has a threaded adjusting screw to adjust the clearance.
The lift of the shaft is different from that of the valve because the rocker arms are generally of different lengths. The tappets have a single arm and are pivoted at one end (the one at the opposite end activates the valve) while the slide on which the shaft acts is positioned in an intermediate position.
In some engines, a single rocker arm is used to activate a pair of adjacent values of the same cylinder; in this case, the rocker arm itself, activated by a single cam, has three arms. Rocker arms are also used in the suspensions, driving gears of some controls, etc.
DLC
Gentilini has developed a coating system for the racing sector, and manufactured in liaison with a specialised company, that improves sliding between the camshaft, rocker arms, bucket tappets, tappets, etc. This coating system is called DLC.
APPLICATIONS OF DLC
- Components subject to sliding and high abrasive wear
- Camshafts, tappets, pin pistons, bucket tappets
ADVANTAGES OF DLC
- Surface hardness from 1800 to 2600 HV
- Friction and sliding coefficient around 8 times lower than that of Steel/Steel.
- This reduces wear, improves performance and increases the life of the components
- It meets the requirements of the intracutaneous reactivity test in accordance with standard ISO 10993-10:2010
- ALL ENGINE MANUFACTURERS ARE MOVING TOWARDS THIS TYPE OF COATING TO INCREASE PERFORMANCE AND REDUCE CONSUMPTION AND EMISSIONS.
MARKETS OF INTEREST
MOTORCYCLE – RACING/MOTOGP/SBK
MOTORCYCLE – RACING OFF ROAD
SCOOTER
MOTORCYCLE
TRIAL
RALLY
AIRCRAFT ENGINE PRODUCTS
NAUTICAL
DIESEL – GENERATORS
Rocker arms
WHAT, HOW, WHY?
Rocker arms enable the functioning of a 4-valve cylinder with a single distribution shaft.
They are used to control the valves in 4-stroke engines. Generally, these components are made of steel obtained from mould steel and an incorporated slide is used that used to be coated with a surface layer of hard chrome while now DLC coating is used. However, in some cases a roller is used to minimise the friction (that from sliding becomes rolling).
Usually, the end of the rocker arm in contact with the valve has a threaded adjusting screw to adjust the clearance.
The lift of the shaft is different from that of the valve because the rocker arms are generally of different lengths. The tappets have a single arm and are pivoted at one end (the one at the opposite end activates the valve) while the slide on which the shaft acts is positioned in an intermediate position.
In some engines, a single rocker arm is used to activate a pair of adjacent values of the same cylinder; in this case, the rocker arm itself, activated by a single cam, has three arms. Rocker arms are also used in the suspensions, driving gears of some controls, etc.
DLC
Gentilini has developed a coating system for the racing sector, and manufactured in liaison with a specialised company, that improves sliding between the camshaft, rocker arms, bucket tappets, tappets, etc. This coating system is called DLC.
APPLICATIONS OF DLC
- Components subject to sliding and high abrasive wear
- Camshafts, tappets, pin pistons, bucket tappets
ADVANTAGES OF DLC
- Surface hardness from 1800 to 2600 HV
- Friction and sliding coefficient around 8 times lower than that of Steel/Steel.
- This reduces wear, improves performance and increases the life of the components
- It meets the requirements of the intracutaneous reactivity test in accordance with standard ISO 10993-10:2010
- ALL ENGINE MANUFACTURERS ARE MOVING TOWARDS THIS TYPE OF COATING TO INCREASE PERFORMANCE AND REDUCE CONSUMPTION AND EMISSIONS.
MARKETS OF INTEREST
MOTORCYCLE – RACING/MOTOGP/SBK
MOTORCYCLE – RACING OFF ROAD
SCOOTER
MOTORCYCLE
TRIAL
RALLY
AIRCRAFT ENGINE PRODUCTS
NAUTICAL
DIESEL – GENERATORS
How we work
Since 2008 the group has been developing new components for leading companies in the two-wheeler sector and continuing to develop and expand its interests more and more.
The close-knit team of technicians and engineers collaborates in synergy with industry experts , to find valid and concrete solutions in every area.
In making our products, the search for the best raw materials is accompanied by a careful selection and control of treatments (especially necessary for the nautical market)
