Gauge for checking the clearance existing between the cams of a camshaft and the relevant valves
AssigneeFinike Italiana Marposs S.p.A.
InventorSergio Solaroli
Life of this patent
Estimating the term…
Abstract
A gauge for measuring the clearance between a cam of an engine camshaft and the relevant valve, during rotation of the camshaft, comprises a first movable feeler element, for contacting the cam profile, and a second movable feeler element, for contacting a surface, facing the cam, of the valve or of an element coupled to the valve. A retraction device can displace the second feeler element from a rest position to an operating position. Gauging heads provide a signal depending on the mutual position of the first and second feeler elements and a processing circuit processes these signals to obtain the clearance.
Claims13
A gauge for checking the clearance existing between the cams of an engine camshaft and the associated valves, comprising:
- support means;
- drive means for rotating the camshaft;
- control means;
- gauging means including:
- a first measuring element movably coupled to the support means for undertaking, during rotation of the camshaft, positions responsive to the positions of a valve;
- a second measuring element movably coupled to the support means for contacting, during rotation of the camshaft, the surface of the cam associated with said valve;
- and a gauging device coupled to the first measuring element and the second measuring element for providing a signal indicative of the mutual position of said first measuring element and a second measuring element;
- and processing means connected to the gauging device for processing said signal during rotation of the camshaft and determining the amount of clearance between said valve and the associated cam;
- wherein the control means is coupled to the first measuring element for displacing it from a measurement position, where the first measuring element is arranged close at a side of said cam, to a rest position where the first measuring element is arranged apart from the path of displacement of said cam, during a part of the rotary movement of the cam.
A gauge for checking the clearance existing between the cams of an overhead camshaft and the associated valves of an automobile engine having the overhead camshaft arranged for direct cooperation of the cams with bucket type tappets, comprising:
- support means;
- drive means for rotating the camshaft;
- gauging means including:
- first measuring means including a measuring element movably coupled to the support means for undertaking, during rotation of the camshaft, positions responsive to the positions of a valve;
- and second measuring means for providing, during rotation of the camshaft, a signal indicative of the mutual positions of the valve and of the surface of the relevant cam;
- and control means coupled to the measuring element for controlling, depending on the angular position of the cam, the retraction of the measuring element from a measurement position where the measuring element is arranged close at a side of the cam, to a rest position, where the measuring element is arranged apart from the cam, thereby to prevent the tip of the cam from touching the measuring element during a first portion of the rotary movement of the cam.
Dependencies are inferred from the claim text.