Pickup for measuring the maximum pressure in internal combustion engine cylinder

Claim 1

A pickup for measuring the maximum pressure in the internal combustion engine cylinder, comprising: a housing; a first pipe connection made on said housing for providing a communication with the internal combustion engine cylinder; a second pipe connection made on said housing for providing a communication with a compressed air supply passage; a reversing valve mounted in said housing and having two operating surfaces; a first seat made in said housing on the side of the compressed air supply passage and being in contact with one of the operating surfaces of said reversing valve in one of its operating positions; a valve with a rod mounted in said housing at the side of the engine cylinder; an end face of said rod provided with a bead used as the second seat of said reversing valve being in contact in another operating position with the other operating surface; a first spring pressing said reversing valve to the second seat; a sealing ring located directly on said valve rod and intended for retaining said valve opened and impeding the compressed air flowing from said compressed air supply passage into the engine cylinder; the second spring located on said valve rod and pressing it to said reversing valve; a meter chamber confined with said second seat and a respective operating surface of said reversing valve being in contact with said second seat; a passage made in said valve rod and communicating said meter chamber with the engine cylinder whose pressure at a moment of the reversing valve operation corresponds to the air counterpressure; electrical connections leading from said first spring to the exterior of said housing.