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Cam and eccentric wheel

The key measurement indicators of the camshaft directly determine the timing and sealing of the engine's valve operation.

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The core measurement indicators of the camshaft directly determine the valve timing and sealing of the engine's valve train, with common key indicators in the automotive industry as follows:


凸轮偏心轮


01 Lift: The radial height corresponding to each rotation angle on the cam profile, including maximum lift and base circle radius (the cam's minimum radial dimension).

02 Lift error: the deviation between the actual lift and the theoretical lift, including maximum positive deviation and maximum negative deviation, directly affecting the valve opening extent.

03 Phase angle: the crankshaft angle corresponding to key cam profile points (such as maximum lift point, valve opening/closing points) to ensure valve timing synchronisation in multi-cylinder engines.

04 Profile: The deviation of the entire cam working surface from the theoretical profile.


The core measurement indicators of the eccentric wheel directly determine its transmission stability and fit accuracy, with common key indicators as follows:

01 Eccentric distance: The distance between the centre of the reference shaft (inner hole / journal) of the eccentric wheel and the centre of the eccentric arc is the most critical indicator and must be measured accurately through centre positioning.

02 Eccentric arc radius: the radius of the arc of the eccentric working surface, ensuring the contact fit with mating parts such as push rods and sliders.

03 Eccentric phase angle: the angle between the start/end positions of the eccentric arc and locating features such as key slots or pin holes, ensuring precise transmission timing.

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