GB2249611A - Throttle body sealing unit - Google Patents

Throttle body sealing unit Download PDF

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Publication number
GB2249611A
GB2249611A GB9024048A GB9024048A GB2249611A GB 2249611 A GB2249611 A GB 2249611A GB 9024048 A GB9024048 A GB 9024048A GB 9024048 A GB9024048 A GB 9024048A GB 2249611 A GB2249611 A GB 2249611A
Authority
GB
United Kingdom
Prior art keywords
throttle
butterfly
shaft
sealing unit
seal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB9024048A
Other versions
GB9024048D0 (en
Inventor
Stephen Hyde
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ford Motor Co
Original Assignee
Ford Motor Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ford Motor Co filed Critical Ford Motor Co
Priority to GB9024048A priority Critical patent/GB2249611A/en
Publication of GB9024048D0 publication Critical patent/GB9024048D0/en
Publication of GB2249611A publication Critical patent/GB2249611A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
    • F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
    • F02D9/1035—Details of the valve housing
    • F02D9/106—Sealing of the valve shaft in the housing, e.g. details of the bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
    • F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
    • F02D9/1035—Details of the valve housing
    • F02D9/104—Shaping of the flow path in the vicinity of the flap, e.g. having inserts in the housing
    • F02D9/1045—Shaping of the flow path in the vicinity of the flap, e.g. having inserts in the housing for sealing of the flow in closed flap position, e.g. the housing forming a valve seat

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lift Valve (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Abstract

A butterfly throttle comprises a throttle body 10, a shaft 14 rotatably mounted in the throttle body 10 and a butterfly plate 12 supported on the shaft 14 and rotatable by the shaft 14. At least one flexible seal 18, 20 is mounted in the throttle body 10 and is acted upon on opposites sides by the pressures on the opposite sides of the butterfly plate 12, the force resulting from the pressure differential urging the flexible seal into contact with the butterfly plate. The seal 20 defines a cavity which is in communication via apertures (32, Fig. 5) with the space above the plate 12. In the preferred embodiment a top seal 18 and a bottom seal 20 are formed as part of a tubular sealing unit 16 lining the throttle body 10 and acting also to seal around the shaft 14. <IMAGE>

Description

Throttle Body sealing Unit Field of the invention The present invention relates to unit for effecting a seal between a butterfly plate and throttle body when the throttle is in the fully closed position.
Backqround of the invention Butterfly throttles are commonly used to control the air intake of combustion engines. Such throttles comprise a generally circular butterfly plate mounted on a rotatable shaft which is journalled in a generally cylindrical throttle body. When the throttle is closed, the butterfly plate lies across the throttle body and prevents air flow whereas when the throttle is open the plane of the butterfly plate is parallel to the axis of the throttle body and it presents a minimal obstruction to air flow.
A known problem with butterfly throttles is that the butterfly plate does not fully seal against the throttle body and even in the closed some position air flow takes place. This makes precise control of the engine idling speed difficult because, even though it is common to provide a by-pass passage, an unpredictable amount of air flows through the butterfly throttle.
Object of the invention The invention therefore seeks to provide a butterfly throttle in which an effective seal is provided between the butterfly plate and the throttle body when the throttle is closed.
Summarv of the in'teiLion According to the present invention, there is provided a butterfly throttle comprising a throttle body, a shaft rotatably mounted in the throttle body and a butterfly plate supported on the shaft and rotatable by the shaft between open and closed positions, wherein at least one flexible seal is mounted in the throttle body and is acted upon on opposites sides by the pressures on the opposite sides of the butterfly plate, the force resulting from the pressure differential urging the flexible seal into contact with the butterfly plate.
Conveniently, two crescent shaped seals are provided on opposite sides-of the shaft, the seals being disposed one above and the other below the butterfly plate.
Preferably, the seals are formed integrally with a tubular sealing unit lining the throttle body.
Advantageously, the sealing unit is made of a thermoplastic elastomeric material.
In the preferred embodiment of the invention, the seal disposed on the higher pressure side of the throttle is in the form of a lip projecting from the wall of the sealing unit and the seal on the lower pressure side of the throttle is produced by a deformation of the wall of the sealing unit.
It is particularly advantageous to form a chamfered hole in the sealing unit for receiving the shaft of the butterfly plate, whereby the sealing unit may also effect a seal about the shaft.
Brief descrintion of the drawings The invention will now be described further, by way of example, with reference to the accompanying drawings, in which: Fig. 1 is an axial section through a butterfly throttle taken along the section line A-A in Fig. 2, Fig. 2 is a plan view from above of the butterfly throttle as seen from the direction of arrow B in Fig. 1, Fig. 3 is a partial transverse section drawn to an enlarged scale showing the sealing of the shaft, Fig. 4 is a view of the top seal drawn to an enlarged scale, and Fig. 5 is a view of the bottom seal drawn to an enlarged scale.
Detailed description of the Preferred embodiment Fig. 1 shows a throttle body 10 and a butterfly plate 12 mounted on a shaft 14 extending across the throttle body 10. A sealing unit 16 made of a thermoplastic elastomeric material, such as HYTRALRTM, is constructed as a tube which lines the throttle body 10.
The sealing unit 16 has a bottom seal 18 which lies on the engine side of the butterfly plate 12 and is formed by deformation of the wall of the sealing unit 16 and a top seal 20 which lies on the intake side of the butterfly plate 12 and is formed by a lip projecting from the wall of the sealing unit.
The top seal 20, is crescent shaped in plan view and extends, as shown in Fig. 2, half way around the circumference of the throttle to one side of the shaft 14.
In cross section, the top seal 18 is S-shaped, as shown in Fig. 4, which makes it more resilient and tolerant to errors in the closed position of the butterfly plate 12.
When the throttle is closed, the space beneath the seal 18, as viewed in Fig. .4, is under manifold vacuum whereas the top surface is under atmospheric pressure, the resultant pressure difference acting in the direction of the illustrated arrows to improve the sealing contact. The bottom seal 20 forms part of the wall of the sealing unit and comprises a flexible diaphragm 26 and an abutment ledge 24 terminating in a sealing edge 22. At the lower end of the diaphragm 26 a further sealing lip 28 seals against the throttle body 10 so that a sealed chamber 30 is defined between the diaphragm 26 and the throttle body 10. The chamber 30 communicates with the pressure on the intake side of the butterfly plate 12 through holes 32 in the abutment ledge 24.
When the throttle is in the closed position, the chamber 30 is under atmospheric pressure whereas the other side of the diaphragm is under manifold vacuum. The diaphragm 26 is therefore deflected by the differential air pressure and urges the edge 32 upwards into contact with the butterfly plate 12. The sealing unit therefore effective seals any gap between the butterfly plate 12 and the throttle body 10 on both side of the shaft 14.
The tubular portion of the sealing unit 16 is also designed to effect a seal around the shaft 14. As shown in Fig. 3, the hole 36 in the sealing unit 16 through which the shaft 14 passes is chamfered and forms a narrow sealing lip 38 which seals against the shaft 14 without offering serious resistance to movement of the shaft 14.
because air leakage around the butterfly plate 12 and the shaft 14 can be minimised, the air flow at idle speed can be accurately controlled by means of a by-pass passage and this can allow the idle speed to be reduced without introducing instability.
As well as reducing air leakage, the sealing unit 16 reduces the need for accurate machining of the throttle body 10 and the butterfly plate 12 and simplifies assembly and calibration since the unit itself determines the throttle stop position.

Claims (7)

1. A butterfly throttle comprising a throttle body, a shaft rotatably mounted in the throttle body and a butterfly plate supported on the shaft and rotatable by the shaft between open and closed positions, wherein at least one flexible seal is mounted in the throttle body and is acted upon on opposites sides by the pressures on the opposite sides of the butterfly plate, the force resulting from the pressure differential urging the flexible seal into contact with the butterfly plate.
2. A butterfly throttle as claimed in claim 1, wherein two crescent shaped seals are provided on opposite sides of the shaft, the seals being disposed one above and the other below the butterfly plate.
3. A butterfly throttle as claimed in claim 2, wherein the seals are formed integrally with a tubular sealing unit lining the throttle body.
4. A butterfly throttle as claimed in claim 3, wherein the sealing unit is made of a thermoplastic elastomeric material.
5. A butterfly throttle as claimed in claim 3 or 4, wherein the seal disposed on the higher pressure side of the throttle is in the form of a lip projecting from the wall of the sealing unit and the seal on the lower pressure side of the throttle is produced by a deformation of the wall of the sealing unit
6. A butterfly throttle as claimed in any one of claims 3 to 5, wherein a chamfered hole is formed in the sealing unit for receiving the shaft of the butterfly plate, whereby the sealing unit may also effect a seal about the shaft.
7. A butterfly throttle constructed, arrangea and adapted to operate substantially as herein described with reference to and as illustrated in the accompanying drawings.
GB9024048A 1990-11-06 1990-11-06 Throttle body sealing unit Withdrawn GB2249611A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9024048A GB2249611A (en) 1990-11-06 1990-11-06 Throttle body sealing unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9024048A GB2249611A (en) 1990-11-06 1990-11-06 Throttle body sealing unit

Publications (2)

Publication Number Publication Date
GB9024048D0 GB9024048D0 (en) 1990-12-19
GB2249611A true GB2249611A (en) 1992-05-13

Family

ID=10684903

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9024048A Withdrawn GB2249611A (en) 1990-11-06 1990-11-06 Throttle body sealing unit

Country Status (1)

Country Link
GB (1) GB2249611A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19530003A1 (en) * 1995-08-16 1997-02-20 Behr Gmbh & Co Rotatable flow control valve
FR2891886A1 (en) * 2005-10-07 2007-04-13 Mark Iv Systemes Moteurs Soc P CLAMP CONTROL DEVICE AND ADMISSION MANIFOLD COMPRISING AT LEAST ONE SUCH DEVICE
FR2905159A1 (en) * 2007-09-14 2008-02-29 Mark Iv Systemes Moteurs Soc P Valve controlling device for vehicle`s internal combustion engine, has annular support body with functional segments of bushing, which are situated with respect to contour of projection plane of passage in fluid flow direction
EP1947312A1 (en) * 2007-01-16 2008-07-23 Hitachi, Ltd. Butterfly valve device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3771763A (en) * 1972-04-04 1973-11-13 Honeywell Inc Butterfly valve with side mounted pressure seal ring
GB2040405A (en) * 1979-01-03 1980-08-28 Worcester Controls Corp Butterfly valve
GB2092714A (en) * 1978-03-10 1982-08-18 Adams Araturen N Apparate Gebr Seal rings for use in disc valves
GB2213236A (en) * 1987-12-03 1989-08-09 White Consolidated Ind Inc Metallic seal for high performance butterfly or ball valve

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3771763A (en) * 1972-04-04 1973-11-13 Honeywell Inc Butterfly valve with side mounted pressure seal ring
GB2092714A (en) * 1978-03-10 1982-08-18 Adams Araturen N Apparate Gebr Seal rings for use in disc valves
GB2040405A (en) * 1979-01-03 1980-08-28 Worcester Controls Corp Butterfly valve
GB2213236A (en) * 1987-12-03 1989-08-09 White Consolidated Ind Inc Metallic seal for high performance butterfly or ball valve

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19530003A1 (en) * 1995-08-16 1997-02-20 Behr Gmbh & Co Rotatable flow control valve
DE19530003C2 (en) * 1995-08-16 1998-06-04 Behr Gmbh & Co Rotatable flow control valve
FR2891886A1 (en) * 2005-10-07 2007-04-13 Mark Iv Systemes Moteurs Soc P CLAMP CONTROL DEVICE AND ADMISSION MANIFOLD COMPRISING AT LEAST ONE SUCH DEVICE
EP1772615A3 (en) * 2005-10-07 2007-04-25 Mark Iv Systemes Moteurs (Sas) Valve regulating device and intake manifold comprising at least one such device
US7353801B2 (en) 2005-10-07 2008-04-08 Mark Iv Systemes Moteurs Valve regulating device and intake manifold comprising at least one such device
EP1947312A1 (en) * 2007-01-16 2008-07-23 Hitachi, Ltd. Butterfly valve device
US7866298B2 (en) 2007-01-16 2011-01-11 Hitachi, Ltd. Butterfly valve device
FR2905159A1 (en) * 2007-09-14 2008-02-29 Mark Iv Systemes Moteurs Soc P Valve controlling device for vehicle`s internal combustion engine, has annular support body with functional segments of bushing, which are situated with respect to contour of projection plane of passage in fluid flow direction

Also Published As

Publication number Publication date
GB9024048D0 (en) 1990-12-19

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)