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Mechanism for locking a variable cam timing device

A technology for locking positions and cams, applied in the field of position mechanisms, can solve problems such as uncontrolled phasing of VCT devices, uncommanded phasing of camshafts and crankshafts, and reduced engine efficiency

Active Publication Date: 2019-04-02
BORGWARNER INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Under certain engine conditions, when the VCT unit is locked, hydraulic and mechanical input on the VCT unit may unlock the lock pin, resulting in uncommanded phasing between the camshaft and crankshaft
Uncommanded unlocking and the resulting uncontrolled VCT device phasing can lead to reduced engine efficiency and other engine related problems

Method used

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  • Mechanism for locking a variable cam timing device
  • Mechanism for locking a variable cam timing device
  • Mechanism for locking a variable cam timing device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] Figures 1a-1d The lock pin of the first embodiment is shown, wherein the lock pin has three separate areas. An "I" shaped locking pin 100 having a first end 100a and a second end 100b is received within a stepped hole 109 of the rotor 105 of the VCT device or phaser. The stepped hole 109 has a first diameter 109a and a second diameter 109b.

[0026] The first end 100a of the locking pin 100 is received in the pin receptacle 101a of the end plate 101 of the phaser. The oil pressure in the pin receptacle 101a can be controlled by the ECU to re-lock by depressurizing, or pressurize by moving the front end of the lock pin 100 to unlock the lock pin 100 .

[0027] The first end 100a of the locking pin 100 has an area A102 and is the top surface of the "I" or top line of the first engagement area 100c. The lower surface of the top line of "I" forms the second region B103. The "I" or the top surface of the bottom line of the second land 100d forms the third region C104. ...

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PUM

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Abstract

A lock pin for a VCT device that has a locked position, locking a housing assembly relative to a rotor assembly of the variable cam timing device, and an unlocked position. The lock pin has a body comprising a first diameter with a first area, a second diameter with a second area, and a chamber formed between the first area of the first diameter and the second area of the second diameter for receiving fluid, the first area being greater than the second area. When fluid is applied to the chamber through the variable cam timing phaser, a difference between first area and the second area definingthe chamber creates a force imbalance, such that the oil pressure applied to the chamber of the body assists in maintaining the Sock pin in the locked position.

Description

technical field [0001] The present invention relates to the field of variable camshaft timing (VCT) devices. More particularly, the present invention relates to mechanisms for locking the position of variable cam timing devices. Background technique [0002] Variable Camshaft Timing (VCT) devices use locking pins to fix the timing between the camshaft and crankshaft without the need for engine control unit (ECU) input. The VCT device may use a spring to keep the detent engaged. When commanded, commanding the VCT unit to change timing, engine oil pressure can be used to overcome the spring force and retract the detent, allowing the VCT unit to be phased. [0003] Under certain engine conditions, when the VCT unit is locked, hydraulic and mechanical inputs on the VCT unit may unlock the locking pin, resulting in uncommanded phasing between the camshaft and crankshaft. Uncommanded unlocking and the resulting uncontrolled phasing of the VCT unit can lead to reduced engine eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L1/34F01L13/00
CPCF01L1/34F01L13/00F01L2001/34423F01L2001/34453F01L2001/34456F01L2001/34469F01L1/3442F01L13/0015
Inventor J·D·尼克尔斯W-J·权
Owner BORGWARNER INC