Browse Prior Art Database

Development of a Plastic Throttle Body

IP.com Disclosure Number: IPCOM000017580D
Original Publication Date: 2001-Apr-01
Included in the Prior Art Database: 2003-Jul-23
Document File: 6 page(s) / 85K

Publishing Venue

Siemens

Related People

Paul Daly, Auburn Hills: AUTHOR [+2]

Abstract

Since the large scale production of plastic throttle bodies in 1994 there have been a number of further introductions. The universal adaptation of plastic for the throttle body has not yet occurred. This idea deals with design approaches and processing solutions to facilitate low cost precision manufacturing with test results of actual parts made by these approaches. The existing approach to plastic throttle body production has been to imitate the metal parts, including the butterfly feature, that have existed since the first cars were built. Through the years the metal parts have evolved but always stayed with the butterfly concept.

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Industrie

Development of a Plastic Throttle Body

Idee: Paul Daly, Auburn Hills, MI (USA); Jim Vanderveen, Auburn Hills, MI (USA)

Since the large scale production of plastic throttle bodies in 1994 there have been a number offurther introductions. The universal adaptation of plastic for the throttle body has not yetoccurred. This idea deals with design approaches and processing solutions to facilitate low costprecision manufacturing with test results of actual parts made by these approaches.

The existing approach to plastic throttle body production has been to imitate the metal parts,including the butterfly feature, that have existed since the first cars were built. Through the yearsthe metal parts have evolved but always stayed with the butterfly concept.

Early cars used a carburetor in which the fuel mixing and metering function were integrated to theairflow control function in one assembly. However very early carburetors were made from Brass,and later became Zinc (alloys) and eventually progressed to Aluminum as solutions to porosityconcerns became better understood.

Throttle bodies for fuel injected cars have been predominantly Aluminum in conjunction with thetraditional metal attachment, forming, and fabricating technologies.

Fuel injected cars became commonplace from 1975 and by 1984 emerged to become dominant,in compliance with stringent emission standards. Virtually all throttle bodies on passenger carswere mechanically operated from the turn of the century until the late 80’s. Between 1981 and1986 there was a proliferation of throttle body injection systems (also known as single pointinjection) including some reported work on Integrated Throttle Body developments whichincluded not only the fuel system but also the electronics to run the engine. Electronically operated(also known as ETC (Electronic Throttle Control) and “drive by wire”) have been observed as anemerging application and may be poised to become the dominant form of air control.

1. Alloy housing

2. Metal blade� (alloy/brass/steel)

3. Attachment screws blade to housing (2)

4. Shaft and cam lever – typically fabricated

5. Return springs as required by standards (2)

6. Position sensor

Siemens Technik Report

Jahrgang 4� Nr. 11� April 2001

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7. Position sensor attachment screws

8. Idle speed control device

9. Attachment seal to manifold

10. Attachment fastener to manifold

11. Vacuum hose nipples- inserted

12. Adjusting screw for min position

13. Bearings (with seals)

14. Snap ring for shaft retention

Table 1: Bill of materials for typical Aluminum Throttle body with mechanical actuation.

Table 1: Bill of materials for typical Aluminum Throttle body with mechanical actuation.

Some of the above parts can be eliminated for either metal or plastic throttle bodies if customerscan change their buying habits. However for a new generation of plastic throttle body it isappropriate to attack as many problems as possible to precipitate the most benefit fr...