Check patentability & draft patents in minutes with Patsnap Eureka AI!

Fuel injector having piezoelectric actuator with preload control element and method

A technology of piezoelectric actuators and fuel injectors, applied in fuel injection devices, components of piezoelectric devices or electrostrictive devices, piezoelectric/electrostrictive/magnetostrictive devices, etc., can solve Augustine not working etc.

Inactive Publication Date: 2009-09-23
CATERPILLAR INC
View PDF4 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In other instances, however, Augustine may not work particularly in certain temperature ranges or when using certain materials to make the actuator

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Fuel injector having piezoelectric actuator with preload control element and method
  • Fuel injector having piezoelectric actuator with preload control element and method
  • Fuel injector having piezoelectric actuator with preload control element and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] see figure 1 , shows a fuel injector 40 according to a specific embodiment. The fuel injector 40 includes an injector body 42 having a first body member 43 and a second body member 45 . The actuator assembly 46 is mounted on the injector body 42 and is joined between the first body member 43 and the second body member 45 . In one embodiment, the actuator assembly 46 is operatively coupled to a control valve arrangement 68 via a rod 66 . The control valve arrangement 68 may be configured to control fluid pressure acting on a control surface 74 of an outlet stem 70 of the fuel injector 40 . Fuel at a relatively high pressure may be supplied to fuel injector 40 through fuel inlet 72 fluidly connected to outlet valve stem 70 . In one embodiment, fuel inlet 72 is coupled to a high pressure common rail of a fuel system (not shown) including fuel injectors 40 . The outlet valve stem 70 is movable between a first position and a second position to selectively connect a set o...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A fuel injector includes a piezoelectric actuator subassembly having a casing and a piezoelectric element disposed within the casing. The piezoelectric element has an operating temperature range and includes a thermally contractive material having a negative thermal expansion coefficient over a second temperature range overlapping with the operating temperature range. A preload control element is coupled with the piezoelectric element and includes a thermally expansive material having a positive thermal expansion coefficient over the second temperature range. The preload control element maintains a constant preload on the piezoelectric element over a wide temperature range to inhibit temperature induced variability in operation, and can axially lengthen in opposition to axial shortening of the piezoelectric element, responsive to a temperature increase.

Description

technical field [0001] The present disclosure relates generally to piezoelectric actuators and piezoelectric-actuated devices, and more particularly to the suppression of variability by thermal expansion preload control elements in the operation of piezoelectric actuators. Background technique [0002] Piezoelectric actuators are increasingly used in a variety of applications. One common design uses piezoelectric actuators to control the position of a control valve for controlling fuel injection through a fuel injector. Piezoelectric actuators have proven to have advantages over traditional actuator systems such as electromagnetic actuators. In particular, piezoelectric actuators are capable of relatively precise and repeatable operation under the demanding conditions typically associated with fuel injector operation. The generally superior performance of piezoelectric actuators has led to their replacement for conventional actuators in certain fuel system types. [0003]...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H02N2/00F02M51/00
CPCF02M47/027F02M51/0603H01L41/0536F02M61/167H01L41/053H01L41/04H01L41/042H01L41/083H10N30/886H10N30/50
Inventor A·M·赫斯D·R·伊布拉海姆S·R·刘易斯J·文卡塔拉格哈范S·拉克哈帕蒂
Owner CATERPILLAR INC
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com