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Camshaft phaser with centrally located lock pin valve spool

Inactive Publication Date: 2014-05-08
DELPHI TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a device called a camshaft phaser that can change the timing of when a camshaft in an engine is in relation to a crankshaft. This device includes a stator and a rotor, and it uses pressure oil to change the timing. The device also has a lock pin that can be engaged or disengaged to control the timing. The lock pin is controlled by a valve spool and is made to engage or disengage by a user-controlled pressure valve. The device is attached to the camshaft using a bolt, and it is designed to control the timing of the engine's camshaft.

Problems solved by technology

However, some camshaft bearings may not be sufficiently large to accommodate three annular grooves and there may not be sufficient space available to increase the size of the camshaft bearing to accommodate three annular grooves.

Method used

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  • Camshaft phaser with centrally located lock pin valve spool
  • Camshaft phaser with centrally located lock pin valve spool
  • Camshaft phaser with centrally located lock pin valve spool

Examples

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Embodiment Construction

[0019]In accordance with a preferred embodiment of this invention and referring to FIGS. 1-12 wherein like reference numerals are used to identify identical components in the various views, an internal combustion engine 10 is shown which includes a camshaft phaser 12 extending along an axis A. Internal combustion engine 10 also includes a camshaft 14 which is rotatable about axis A based on rotational input from a crankshaft and chain (not shown) driven by a plurality of reciprocating pistons (also not shown). As camshaft 14 is rotated, it imparts valve lifting and closing motion to intake and / or exhaust valves (not shown) as is well known in the internal combustion engine art. Camshaft phaser 12 allows the timing between the crankshaft and camshaft 14 to be varied. In this way, opening and closing of the intake and / or exhaust valves can be advanced or retarded in order to achieve desired engine performance.

[0020]Camshaft phaser 12 includes a stator 16 having a sprocket 18 which is ...

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Abstract

A camshaft phaser includes a stator having lobes and a rotor disposed within the stator having vanes interspersed with the lobes. A lock pin disposed within one of the rotor and the stator selectively engages a seat for preventing relative rotation between the rotor and the stator when the lock pin is engaged with the seat. A bolt extends coaxially through the rotor and the stator to attach the camshaft phaser to a camshaft. A valve spool in the bolt controls the flow of oil to and from the lock pin. The bolt includes a supply drilling extending therethrough to supply pressurized oil to the valve spool.

Description

TECHNICAL FIELD OF INVENTION[0001]The present invention relates to a hydraulically actuated camshaft phaser for varying the phase relationship between a crankshaft and a camshaft in an internal combustion engine; more particularly to such a camshaft phaser including a lock pin for selectively preventing a change in phase relationship; and even more particularly to such a camshaft phaser which includes a lock pin valve spool for locking and unlocking the lock pin.BACKGROUND OF INVENTION[0002]A typical vane-type camshaft phaser generally comprises a plurality of outwardly-extending vanes on a rotor interspersed with a plurality of inwardly-extending lobes on a stator, forming alternating advance and retard chambers between the vanes and lobes. Engine oil is selectively supplied to one of the advance and retard chambers and vacated from the other of the advance and retard chambers in order to rotate the rotor within the stator and thereby change the phase relationship between an engine...

Claims

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Application Information

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IPC IPC(8): F01L1/344
CPCF01L1/344F01L1/3442F01L2001/34426F01L2001/34433F01L2001/34453F01L1/34
Inventor LICHTI, THOMAS H.SHUM, CAI P.
Owner DELPHI TECH INC
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