US3847499A - Tool and method for reaming and tapping a spark plug opening in a rotary engine housing - Google Patents
Tool and method for reaming and tapping a spark plug opening in a rotary engine housing Download PDFInfo
- Publication number
- US3847499A US3847499A US00394035A US39403573A US3847499A US 3847499 A US3847499 A US 3847499A US 00394035 A US00394035 A US 00394035A US 39403573 A US39403573 A US 39403573A US 3847499 A US3847499 A US 3847499A
- Authority
- US
- United States
- Prior art keywords
- opening
- reamer
- spark plug
- bushing
- alignment block
- 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.)
- Expired - Lifetime
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B49/00—Measuring or gauging equipment on boring machines for positioning or guiding the drill; Devices for indicating failure of drills during boring; Centering devices for holes to be bored
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B41/00—Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor
- B23B41/12—Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor for forming working surfaces of cylinders, of bearings, e.g. in heads of driving rods, or of other engine parts
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49718—Repairing
- Y10T29/49732—Repairing by attaching repair preform, e.g., remaking, restoring, or patching
- Y10T29/49734—Repairing by attaching repair preform, e.g., remaking, restoring, or patching and removing damaged material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
- Y10T408/03—Processes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
- Y10T408/55—Cutting by use of rotating axially moving tool with work-engaging structure other than Tool or tool-support
- Y10T408/553—Centering means adapted to be replaced by Tool
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
- Y10T408/55—Cutting by use of rotating axially moving tool with work-engaging structure other than Tool or tool-support
- Y10T408/557—Frictionally engaging sides of opening in work
Definitions
- ABSTRACT A tool and method for in-place reaming and tapping of a damaged spark plug opening in rotary engine housing for receipt of a threaded insert wherein an alignment block is secured by a bolt to an undamaged spark plug opening after a second opening of the alignment block is aligned with the aid of an alignment pin to the damaged spark plug opening. After the alignment pin is removed, the second opening of the alignment block is adapted to operatively receive seriatim a reamer assembly for reaming out the damaged threads of the spark plug opening and a tap assembly for tapping the reamed hole. Air is forced into the engine housing through a conduit in the securing bolt and passed outwardly through the flutes of the reamer and tap assemblies during the reaming and tapping operation to prevent metallic chips from falling into the engine housing and thereby damaging rotar seals.
- This invention relates to a tool and method for preparing a defective spark plug opening in a rotary engine housing for the receipt of a threaded insert; and more particularly, to a tool and method for preparing such a defective opening by reaming and tapping the same without the necessity of removing the engine from its installation and without the danger of metallic chips falling into the housing and possibly damaging rotor seals.
- This housings of rotary engines are usually made of relatively soft material such as aluminum, consequently, the threads of the spark plug openings are susceptible to being damaged by repeated insertion and removal of the plugs. When damaged, the damaged threads must be reamedout and new threads tapped in the opening. A harder threaded insert, such as shown in U.S. Pat. No. 3,604,105,,may then be inserted into the tapped opening for receipt of the spark plug.
- the elements of the tool generally comprise an alignment block, securing bolt, guide pin, and reamer and tap assemblies.
- the alignment block has two cylindrical openings. It is secured to the engine housing by a securing bolt which extends through one opening into threaded engagement with an undamaged spark plug opening. Prior to the bolt being seated, the second threaded opening of the alignment block is aligned with and superimposed above an adjacent spark plug opening having damaged threads. To align the block in this position, the block is maneuvered by a guide pin, extending through the second alignment block opening, until the pin drops intothe damaged spark plug opening. Thereafter, the securing bolt is seated to clamp the block securely in place.
- the alignment pin is removed and a reamer assembly is installed in the threaded opening of the block.
- the reamer assembly comprises a reamer clamped to a bushing which is in turn threadably engaged with the threaded block opening. Rotation of the assembly feeds the bushing and included reamer into the spark plug opening and thereby reams out the damaged threads.
- a bellville washer clamped between the bushing and the reamer, acts as a clutch means to enable the reamer to slip relative to the bushing when making a cut, which thereby regulates the infeed of the reamer into the spark plug opening.
- the reamer assembly is removed and a tap assembly, comprising a tap and tap bushing, is inserted into the threaded opening of the alignment block.
- the tap is thereafter rotated to tap new threadsinto the reamed spark plug opening. Since the tap is of smaller diameter than the block opening, a smooth-wall, centeringbushing is inserted between the tap and the opening tocenter and support the tap while beingrotated.
- thealignment block is preferably spaced above the rotary housingby a spacing bushing, inserted-into the first-opening of the block and extending below therefrom intotcontactawith the housing.
- the alignment block is removed -by unscrewing the securing bolt.
- a threaded insert of the type shown'in -U.S. Pat. No. 3,604,105 is then inserted intogtheenlarged tapped opening for the receipt of a sparkgplug.
- the invention accordinglycomprises the features of construction, a combinationof elements, an arrangement of parts which can be-exemplifiedrinthe Construction hereinafter set forth, and the scope of the invention will be indicated in the claims.
- FIG. 3 is a partial front elevational view, partially in cross section, of the threaded second opening of the alignment-block of FIG. 1 in-combination-with atapfor tapping new threads in thedamagedsparkplug opening after being reamed;
- FIG. 4 is a partial front-elevational view,'par.tialiy+in cross section, illustrating the damaged sparkplugopening of FIG. 1 after being reamed and tapped, and m-an exploded view, illustrating an insert of the type. intended to be inserted within the tapped opening,
- principal elements of the tool comprising my invention consist of an alignmentblock'2, a;se curing bolt 4, a hold-out bushing 6,. a, guide pin-i8, a reamer assembly 10, and a tap' assembly 12.
- alignment block- 2 has a first cylindrical opening *l'4an'd a second threaded cylindrical opening 116. Each 'opening is suitably positioned and dimensioned for respective alignment with a first and second conventional sparkplug opening 18, 20 of a rotary engine housing 22.
- Alignment block 2 is cubic in dimension with a rectangular upper and lower face and of a size sufficiently large to support the spacing and location of alignment block holes l4, 16; yet sufficiently small in dimension so as to be installed on the outer surface of housing 22 without interference.
- Rotary engine housing 22 is of the type frequently used in automotive applications. Interior wall 24, only a portion of which is shown, of engine housing 22 is eliptical and a rotor, not shown, rides about the wall in a conventional manner. Spacing of the rotor vanes is such that as the rotor rotates about the wall 24, the vanes form a combustion chamber to which at one point in time of rotation, sparkplug openings 18, 20, are in common communication.
- Housing 22 is made from aluminum or other soft material.
- the threads of the sparkplug openings are susceptible to being damaged by overtorquing the plug, by carbon at the end of the plug damaging the threads upon removal, and other similar causes.
- the threads of the sparkplug opening When the threads of the sparkplug opening are damaged, the threads must be reamed out and new threads tapped in the reamed opening. Since the opening is over-sized after this operation, an insert, of the type shown in the U.S. Pat. No. 3,604,105, is placed within the tapped opening for receipt of the sparkplug.
- the tool comprising this invention provides a means for preparing a damaged opening to receive the insert without damage to the engine and without the necessity of removing it from the automobile.
- sparkplug opening 18 is considered normal while opening 20 is considered damaged and in need of repair.
- the first opening 14 of the alignment block receives in a pressed-fit relationship, hold-out bushing 6.
- the hold-out bushing, or spacer means extends below the bottom surface of the block and butts against shoulder 26 of an enlarged counterbore formed in sparkplug opening 18.
- the extension of bushing 6 from the bottom of the alignment block is such that the alignment block is spaced from housing 22 when the bushing contacts shoulder 26. It is desirable to space the alignment block from the housing 22 to facilitate the passage of air and cut chips from the sparkplug opening 20 when the damaged threads are being reamed, as will be explained in more detail below, but it is not absolutely necessary that this spacing be provided.
- Securing bolt 4 extends through hold-out bushing 6 and is threaded into the undamaged first sparkplug opening 18 to rigidly clamp the alignment block 2 to housing 22. Extending throughout the length of bolt 4 is a central bore 28 functioning to provide a means for passing compressed air into the housing 22.
- a threaded counterbore 30 is provided at the upper end of the bore 28 as an appropriate fitting for attachment to a compressed air line, not shown.
- a sealing washer 32 seals the space between the head of the bolt and the bushing 6.
- Guide pin 8 is used to perfectly align the threaded opening 16 of the alignment block with respect to the damaged spark plug opening 18. Its diameter provides a sliding fit relationship between the pin and the alignment block opening, and it has a lower tapered end for self-centering insertion into the defective sparkv plug opening 20 as shown in FIG. 1. After the alignment block is suitably aligned, the securing bolt is seated to rigidly secure and clamp the alignment block 2 to hous ing 22 as seen.
- the reamer assembly comprises a threaded bushing 36 clamped to a fluted reamer 38 by nut 40 and lock nut 42.
- a typical bellville washer 44 acting as a clutch means, is clamped between the nut 40 and bushing 36.
- a driver such as a wrench
- bushing 36 is clamped in combination with the bellville washer 44 in such a manner that upon a predetermined torque, reamer 38 will rotate relative to the bushing.
- reamer 38 As reamer 38 is rotated and takes a cut of metal in the spark plug opening, it is preferably, to facilitate utility, that the reamer not advance further into the spark plug opening, that is, have the reamer at the same cutting level, until the metal is completely cut. This is accomplished by the clutch means. As the reamer is making its out, the resistance to downward movement of the reamer creates a torque between the reamer and the bushing that exceeds the clamping force or friction created by the bellville washer which in turn causes the reamer to slip relative to the bushing until the cut is complete.
- the resistance of the downward movement of the reamer is not adequate to overcome the clamping force between the bushing and the reamer, and the bushing carries the reamer forwardly to make the next cut.
- the parts are arranged such that when the bushing bottoms out against counterbore 46, the cutting surface of the reamer has completely removed the damaged threads of the spark plug opening without the reamer extending into the opening further than absolutely necessary.
- tap assembly 12 is inserted into the opening 1 as seen in FIG. 3.
- the assembly comprises a fluted tap 48 and a cylindrical tap bushing 50. Since the diameter of the tap is substantially less than that of the threaded opening 16, tap bushing 50 is provided to support and center tap 48 during the tapping operation. There is a sliding fit between bushing 50, block opening 16 and tap 48. New threads are tapped into spark plug opening 20 by rotation of tap 48 by a drive tool, such as a wrench, in a conventional manner.
- the spacing of alignment block 2 from housing 22 allows the metallic chips to pass out between the alignment block and housing 22 as well as through the flutes and out through the top of the reamer.
- the alignment block is removed from the housing and the newly tapped spark plug opening 20, as shown in FIG. 4, is ready to receive a hard, threaded insert 52, of the type described in US. Pat. No. 3,604,105, for receipt of a spark plug.
- the tool and method allows a damaged spark plug opening to be easily repaired by unskilled personnel in a rapid and efficient manner without removing the engine and without damaging sensitive rotor seals by metallic chips falling into the housing during the reaming and tapping operation. Moreover, the tool is economical and feasible to manufacture.
- a tool for preparing a damaged spark plug opening in a rotary engine housing for the receipt of a threaded insert comprising, an alignment block having a first and second opening for respective alignment with undamaged and damaged spark plug openings in communication with a common combustion chamber in said rotary engine, a securing bolt for clamping said alignment block to said housing, said bolt adapted to extend through said first opening of said alignment block and into threaded engagement with said undamaged spark plug opening, said bolt having air conduit means for communication with said combustion chamber, and said alignment block opening having means to receive seriatim a reamer for reaming out damaged threads of said damaged spark plug opening and a tap for tapping new threads in the damaged opening after being reamed.
- said air conduit means in said bolt comprises a central bore extending through the bolt with an upper section of the bore adapted for attachment to a compressed air line.
- the tool of claim 2 further including spacer means for separation of said bloc-k relative to said housing.
- said spacer means comprises a bushing retained within said first alignment block opening and extending below said block for supporting said alignment block above said rotary engine housing.
- the tool of claim 1 in combination with a tap asi sembly, said tap assembly comprising a tap fluted substantially throughout its length for passage of air and metallic chips and disposed within a tap bushing slidably-carried within said second alignment block opening for aligning said tap with the'damaged spark plug opening.
- the tool of claim 1 in combination with alignment means for aligning said second alignment block openment with said undamaged spark plug openingfor attachment of said alignment block to said housing, said bolt having a central air passage extending throughout its length with an upper section adapted to receive a compressed air line; spacer means between said alignment block and said housing for spacing the block relative to said housing, alignment means foraligning said alignment block openings with said spark plug openings prior to said housing, said second alignment block opening being threaded and having means to receive seriatim a reamer assembly for reaming out said damaged spark plug opening and a tap assembly for tapping the threads in said damaged spark plug opening after being reamed, said reamer assembly comprising a reamer clamped to a threaded bushing with said threaded bushing being removably threaded to the second alignment block opening, said reamer being fluted substantially throughout for passage of air and metallic chips, and said reamer having clutch means whereby rotation of said reamer rotates said bushing and feeds said reamer into said
- a method of preparing a spark plug opening in a rotary engine housing for receipt of a threaded insert comprising, reaming out the thread of said opening, tapping new threads in said opening after being reamed and forcing air outwardly from said-housing through said opening while being reamed and tapped in a manner to prevent metallic chips from falling into said housing.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Spark Plugs (AREA)
Abstract
Description
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00394035A US3847499A (en) | 1973-09-04 | 1973-09-04 | Tool and method for reaming and tapping a spark plug opening in a rotary engine housing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00394035A US3847499A (en) | 1973-09-04 | 1973-09-04 | Tool and method for reaming and tapping a spark plug opening in a rotary engine housing |
Publications (1)
Publication Number | Publication Date |
---|---|
US3847499A true US3847499A (en) | 1974-11-12 |
Family
ID=23557286
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00394035A Expired - Lifetime US3847499A (en) | 1973-09-04 | 1973-09-04 | Tool and method for reaming and tapping a spark plug opening in a rotary engine housing |
Country Status (1)
Country | Link |
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US (1) | US3847499A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4218811A (en) * | 1976-02-20 | 1980-08-26 | Sawyer Thomas C | Method for repairing damaged bleeder valve apertures |
US5259706A (en) * | 1992-08-31 | 1993-11-09 | Eugene Gaut | Thread repairing tools |
US6474285B2 (en) * | 2001-02-23 | 2002-11-05 | Tansil L. Phillips | Method of repairing a damaged spark plug hole |
US20030215296A1 (en) * | 2002-05-20 | 2003-11-20 | Botelle John D. | Method, kit and insert for replacing damaged threads |
US20040179906A1 (en) * | 2003-03-12 | 2004-09-16 | Hughes Ralph W. | Tap process for hard workpieces |
US20060285931A1 (en) * | 2005-06-16 | 2006-12-21 | Dean Dennis C | Combination drill guide and clamping device |
US8851036B1 (en) * | 2010-10-14 | 2014-10-07 | Daimler Ag | Internal combustion engine and method for producing such an engine |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1597468A (en) * | 1925-12-01 | 1926-08-24 | Robert L Holehouse | Stud remover |
US3227010A (en) * | 1963-08-13 | 1966-01-04 | Midas Internat Corp | Method of and means for installation of a crankcase ventilating system |
US3750259A (en) * | 1970-12-14 | 1973-08-07 | T Timmons | Method and apparatus for repairing threads of a through bore by installing a threaded sleeve |
US3800391A (en) * | 1972-01-06 | 1974-04-02 | R Westbrook | Apparatus for repairing valve guide openings in cylinder heads |
-
1973
- 1973-09-04 US US00394035A patent/US3847499A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1597468A (en) * | 1925-12-01 | 1926-08-24 | Robert L Holehouse | Stud remover |
US3227010A (en) * | 1963-08-13 | 1966-01-04 | Midas Internat Corp | Method of and means for installation of a crankcase ventilating system |
US3750259A (en) * | 1970-12-14 | 1973-08-07 | T Timmons | Method and apparatus for repairing threads of a through bore by installing a threaded sleeve |
US3800391A (en) * | 1972-01-06 | 1974-04-02 | R Westbrook | Apparatus for repairing valve guide openings in cylinder heads |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4218811A (en) * | 1976-02-20 | 1980-08-26 | Sawyer Thomas C | Method for repairing damaged bleeder valve apertures |
US5259706A (en) * | 1992-08-31 | 1993-11-09 | Eugene Gaut | Thread repairing tools |
US6474285B2 (en) * | 2001-02-23 | 2002-11-05 | Tansil L. Phillips | Method of repairing a damaged spark plug hole |
US20030215296A1 (en) * | 2002-05-20 | 2003-11-20 | Botelle John D. | Method, kit and insert for replacing damaged threads |
US20060099038A1 (en) * | 2003-03-12 | 2006-05-11 | Kennametal Inc. | Tap process for hard workpieces |
US20060039770A1 (en) * | 2003-03-12 | 2006-02-23 | Kennametal Inc. | Tap process for hard workpieces |
US20060051169A1 (en) * | 2003-03-12 | 2006-03-09 | Kennametal Inc. | Tap process for hard workpieces |
US20060051168A1 (en) * | 2003-03-12 | 2006-03-09 | Kennametal Inc. | Tap process for hard workpieces |
US20040179906A1 (en) * | 2003-03-12 | 2004-09-16 | Hughes Ralph W. | Tap process for hard workpieces |
US7143490B2 (en) | 2003-03-12 | 2006-12-05 | Kennametal Inc. | Tap process for hard workpieces |
US7281307B2 (en) | 2003-03-12 | 2007-10-16 | Kennametal Inc. | Tap process for hard workpieces |
US7293338B2 (en) | 2003-03-12 | 2007-11-13 | Kennametal Inc. | Tap process for hard workpieces |
US7305747B2 (en) | 2003-03-12 | 2007-12-11 | Kennametal Inc. | Tap process for hard workpieces |
US7313853B2 (en) | 2003-03-12 | 2008-01-01 | Kennametal Inc. | Tap process for hard workpieces |
US20060285931A1 (en) * | 2005-06-16 | 2006-12-21 | Dean Dennis C | Combination drill guide and clamping device |
US8851036B1 (en) * | 2010-10-14 | 2014-10-07 | Daimler Ag | Internal combustion engine and method for producing such an engine |
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Legal Events
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Owner name: WILMINGTON TRUST COMPANY, RODNEY SQUARE NORTH, WIL Free format text: SECURITY INTEREST;ASSIGNOR:REXNORD INC.;REEL/FRAME:004817/0047 Effective date: 19870430 Owner name: WADE, WILLIAM J., RODNEY SQUARE NORTH, WILMINGTON Free format text: SECURITY INTEREST;ASSIGNOR:REXNORD INC.;REEL/FRAME:004817/0047 Effective date: 19870430 Owner name: REXNORD INC., 350 NORTH SUNNY SLOPE ROAD, BROOKFIE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. AS OF NOVEMBER 2, 1981;ASSIGNOR:TRIDAIR INDUSTRIES;REEL/FRAME:004708/0408 Effective date: 19870427 |
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