Camshaft device for an internal combustion engine having a variable distribution
AssigneesAutomobiles Peugeot, Regie Nationale des Usines Renault
InventorJean-Pierre Calviac
Life of this patent
Estimating the term…
Abstract
A capsule connected to a first source of pressure representing the load of the engine and to a second source of pressure representing the running speed of the engine has its diaphragm connected to a slide valve of a pressure modulator. The latter controls the pressure of lubricating oil in a chamber defined between a piston and a fixed chamber, the chamber being supplied with the oil through a constricted orifice. A camshaft is slidably and rotatably mounted and slidable by the piston. Changes in the pressure of the two sources change the axial position of the camshaft.
Claims10
In a camshaft device for an internal combustion engine having a variable distribution comprising means defining a fixed structure, a camshaft rotatably and axially slidably mounted relative to the structure, a fixed cylinder, a piston slidable in the fixed cylinder and defining with the cylinder a chamber, passage means including a constricted orifice for putting the chamber in communication with lubricating oil of the engine, an oil pressure modulator comprising a member defining an oil discharge orifice and a slide valve cooperative with the member to mask the discharge orifice to an extent which varies with the position of the slide valve relative to the member;
- and passage means putting the chamber in communication with the discharge orifice;
- the provision of a pressure responsive capsule having a movable diaphragm which is connected to shift the slide valve relative to the member of the modulator, a first source of pressure representing the load of the engine, a second source of pressure representing the speed of the engine and passage means putting the interior of the capsule in communication with the first and second sources of pressure.
In a camshaft device for an internal combustion engine having a variable distribution comprising means defining a fixed structure, a camshaft rotatably and axially slidably mounted relative to the structure, a fixed cylinder, a piston slidable in the fixed cylinder and defining with the cylinder a chamber, passage means including a constricted orifice for putting the chamber in communication with lubricating oil of the engine, an oil pressure modulator comprising a member defining an oil discharge orifice and a slide valve cooperative with the member to mask the discharge orifice to an extent which varies with the position of the slide valve relative to the member;
- and passage means putting the chamber in communication with the discharge orifice;
- the provision of a pressure responsive capsule having a movable disphragm which is connected to shift the slide valve relative to the member of the modulator, a first source of pressure representing the load of the engine, a second source of pressure representing the speed of the engine, passage means putting the interior of the capsule in communication with the first and second sources of pressure, a driven pinion slidably mounted on the camshaft, a ring integral with the camshaft, means carried by the ring and defining a cavity having a low coefficient of friction and an axis parallel to the camshaft, and an elongate member integral with the drive pinion and having an axis parallel to the camshaft and guided in the cavity.
Dependencies are inferred from the claim text.