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Hydraulically amplified mechanical coupling

A technology of hydraulic pressure and actuator, applied in mechanical equipment, machine/engine, engine control, etc., can solve the problems of lack, increase fuel injector cost, damage fuel injector durability, etc., achieve high initial power, low The effect of response time

Inactive Publication Date: 2013-01-16
CATERPILLAR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although hydraulic amplification effectively increases the power stroke of the piezoelectric actuator, the force provided by the actuator decreases over the increased stroke
Additionally, hydraulic amplifying devices may lack sufficient force to open the fuel injector valve during the initial portion of the stroke in applications using relatively high injection pressures
Furthermore, since its major components require precision machining of the injector's complex features and sub-components, the durability of the fuel injector can be compromised and the cost of the fuel injector can be increased

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] In the following description, although a fuel injector for use in an internal combustion engine is used for illustrative purposes, it should be understood that the structures and methods described herein are applicable to other devices or systems that use piezoelectric actuators, Such as electromechanical valves, etc.

[0018] A cross-section of a fuel injector 100 according to an embodiment of the present invention is at figure 1 is shown in , and its detailed section is in figure 2 shown in . The fuel injector 100 includes a piezoelectric actuator 102 including a stack of piezoelectric elements 104 housed within a holder 106 and disposed between spacers 108 . Although a particular arrangement is presented for the actuator 102 in the figures for purposes of illustration, any other known arrangement for piezoelectric actuators is contemplated. The electrical connector 110 is connected to the injector 100 and includes an electrical cable (not shown) associated with t...

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PUM

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Abstract

A component includes a transmission arrangement for transmitting a force between an actuator (102) and a control valve (172). The transmission arrangement includes a post (116) that is associated with the actuator (102). The control valve (172) is displaceable to an open position from a closed position when an opening (124) force is applied to the control valve (172) that is greater than a closing force provided to the control valve (172). The transmission arrangement is disposed in the component between the post (116) and the control valve (172) actuator (102) and arranged to mechanically transmit by physical contact an actuator (102) force from the post (116) to the control valve (172) when the post (116) begins to travel towards the extended stroke position, and hydraulically amplify the actuator (102) stroke between the post (116) and the control valve (172) when the post (116) travels from the retracted stroke position to the extended stroke position.

Description

technical field [0001] The present invention relates generally to actuators for use with various components and systems, such as internal combustion engines, and more particularly to a method for transmitting force and / or displacement of an actuator to a component or system Mechanical coupling (coupling) with hydraulic amplification of the controlled element. Background technique [0002] Fuel injectors with piezoelectric actuators are known and used in a variety of applications. Typical piezoelectric actuator devices are made from laminated sheets of wafers of piezoelectric material. When exposed to an electric field, the piezoelectric material in the actuator undergoes a physical dimensional change causing the bulk of the actuator to protrude. The displacement caused by the extension of the actuator is used to actuate the internal components of the system in which the actuator is disposed, such as a fuel injector, during injection. [0003] Although piezoelectric actuat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M61/16F02M61/10F02M63/00F15B7/02
CPCF02M47/027F02M63/0026F02M63/0035F02M63/00F02D41/2096
Inventor J·文卡塔拉加万A·R·斯托克奈尔
Owner CATERPILLAR INC