GB2558882A - Tool and method for crankshaft angle calculation - Google Patents

Tool and method for crankshaft angle calculation Download PDF

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Publication number
GB2558882A
GB2558882A GB1700435.9A GB201700435A GB2558882A GB 2558882 A GB2558882 A GB 2558882A GB 201700435 A GB201700435 A GB 201700435A GB 2558882 A GB2558882 A GB 2558882A
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United Kingdom
Prior art keywords
tool
crankshaft
flywheel
inclinometer
attached
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Withdrawn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
GB1700435.9A
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GB201700435D0 (en
Inventor
Christopher Round Martin
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Individual
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Individual
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Publication date
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Priority to GB1700435.9A priority Critical patent/GB2558882A/en
Publication of GB201700435D0 publication Critical patent/GB201700435D0/en
Publication of GB2558882A publication Critical patent/GB2558882A/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/08—Safety, indicating, or supervising devices
    • F02B77/087—Safety, indicating, or supervising devices determining top dead centre or ignition-timing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25H—WORKSHOP EQUIPMENT, e.g. FOR MARKING-OUT WORK; STORAGE MEANS FOR WORKSHOPS
    • B25H5/00—Tool, instrument or work supports or storage means used in association with vehicles; Workers' supports, e.g. mechanics' creepers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25H—WORKSHOP EQUIPMENT, e.g. FOR MARKING-OUT WORK; STORAGE MEANS FOR WORKSHOPS
    • B25H7/00—Marking-out or setting-out work
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C9/00—Measuring inclination, e.g. by clinometers, by levels
    • G01C9/18—Measuring inclination, e.g. by clinometers, by levels by using liquids
    • G01C9/24—Measuring inclination, e.g. by clinometers, by levels by using liquids in closed containers partially filled with liquid so as to leave a gas bubble
    • G01C9/26—Details
    • G01C9/28—Mountings

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Abstract

A support or locator for a digital clinometer 01 may have a flat face 02 onto which a digital level may be attached via an adhesive locator or via a magnetic means. The bracket may be attached to a flywheel 04 or to a crankshaft of an engine via an internal or external thread on the crank or fly wheel, Figure 2 or Figure 4, 12. The clinometer may be attached to the bracket by mounting screws, Fig 3, 8, 9 and 10. Alternatively the bracket may an L shape having through holes in one face to allow screws Fig 6, 16 to pass through and to be attached to holes present in the flywheel Fig 6, 18. The clinometer is used to measure angular revolution of the crankshaft and flywheel or the position of the piston relative to top dead centre when checking the timing of the engine.

Description

(71) Applicant(s):
Martin Christopher Round
Hillside, Hartshill, NUNEATON, Warks, CV10 0ΝΧ, United Kingdom (56) Documents Cited:
EP 2128564 A1 US 5513441 A
DE 010113024 A1 US 5033292 A (72) Inventor(s):
Martin Christopher Round (58) Field of Search:
INT CL B25H, G01C
Other: EPODOC, WPI, INTERNET (74) Agent and/or Address for Service:
Martin Christopher Round
Hillside, Hartshill, NUNEATON, Warks, CV10 0ΝΧ, United Kingdom (54) Title of the Invention: Tool and method for crankshaft angle calculation
Abstract Title: Mounting bracket for inclinometer used to measure engine crankshaft angle (57) A support or locator for a digital clinometer 01 may have a flat face 02 onto which a digital level may be attached via an adhesive locator or via a magnetic means. The bracket may be attached to a flywheel 04 or to a crankshaft of an engine via an internal or external thread on the crank or fly wheel, Figure 2 or Figure 4, 12. The clinometer may be attached to the bracket by mounting screws, Fig 3, 8, 9 and 10. Alternatively the bracket may an L shape having through holes in one face to allow screws Fig 6, 16 to pass through and to be attached to holes present in the flywheel Fig 6, 18. The clinometer is used to measure angular revolution of the crankshaft and flywheel or the position of the piston relative to top dead centre when checking the timing of the engine.
Figure GB2558882A_D0001
1/6
TOOL FOR USE IN CRANKSHAFT ANGLE CALCULATION
DRAWINGS
Figure GB2558882A_D0002
Fig. 1
Figure GB2558882A_D0003
3/6
Figure GB2558882A_D0004
4/6
Figure GB2558882A_D0005
5/6
Figure GB2558882A_D0006
6/6
Figure GB2558882A_D0007
TOOL AND METHOD FOR CRANKSHAFT ANGLE CALCULATION
BACKGROUND OF THE INVENTION:
1. Field of the Invention
The present invention relates to a method for establishing accurate crankshaft positions, for example, in order to calculate ignition and port timings, and also to a tool for use in that method.
2. Background of the Invention (Prior Art and Inherent Problems)
It is often required to calculate degrees of crankshaft rotation in order to set a combustion engine’s ignition timing, port opening (2-stroke engines) or valve timing (4-stroke engines).
Crankshaft rotation is normally referenced against piston position at the extremes of crankshaft stroke. The uppermost point of piston travel is called Top-Dead-Centre (TDC). Timings are often quoted in degrees Before-Top-Dead-Center (BTDC) or degrees After-Top-Dead-Centre (ATDC).
The first step to any of these degree calculations therefore, is establishing TDC. One way of doing so is to use the piston stop method; which uses a temporary block to prevent piston movement past TDC.
By turning the flywheel rotor one way and then the other until the piston rests against the stop and marking the flywheel position against the engine casing at each extremity, two evenly distributed marks are created. TDC is exactly half-way between these two marks in terms of crankshaft rotation.
The traditional method of establishing this mid-point is to fit a degree-disc to the crankshaft and reference this against a pointer fixed to the engine. So, for example, if there were 70-degrees between the two stop marks then TDC would be located 35degrees from each of the marks.
Sadly, the use of degree discs is not perfect. ‘By eye’ measurements introduce inaccuracy. Using a degree disc often requires a specific pointer to be made for each sort of engine. Also, it is common that the flywheel must be removed in order for the degree disc to be fitted to the crankshaft. This is often a slow process because a flywheel puller tool is often required to extract the flywheel from the crankshaft.
An alternative way to calculate crankshaft position for engine tuning is to a mount a relative digital position sensor connected between the crankshaft and the engine casing. This involves measurements of relative rotation of elements within the sensor. Specialist fittings for each type of engine are often required, adding to cost and slowing the process.
The use of relative digital rotation sensors often requires the removal of the flywheel and specialist adaptors to connect the sensor to both the crankshaft and engine casing, so that one part can be referenced against the other.
STATEMENT OF INVENTION
3: Summary of the Invention
According to the invention I provide a tool which fixes to the crankshaft or flywheel of an engine, by means of threaded fastening, whereby the tool provides a mount for a gravity-referencing inclinometer.
The tool provides a mounting surface to which a gravity-referencing inclinometer may be attached, a plane of the mounting surface being perpendicular to a rotational axis of a threaded portion of the tool. In use, the threaded portion of the tool attaches to the engine in line with the rotational axis of the crankshaft.
In versions of the tool which attach to the engine by a plurality of extractor threads, the plane of the inclinometer mounting surface is also perpendicular to the rotational axis of the crankshaft.
The tool may be constructed of ferrous material to act as a platform for a magnetic inclinometer.
Alternatively, the tool may be made from a material with no magnetically-attractive properties, for instance plastic or some grades of stainless steel. In that case permanent magnets or elements of ferritic material may be used within the tool platform for the attachment of magnetic inclinometer.
Alternatively, the inclinometer may be attached to a flat surface of the tool via screw fasteners, or adhesive, or by clamp.
This tool makes it possible to calculate crankshaft position in combustion engines with ease, where the flywheel has a concentric thread, or threads, for use with a flywheel extractor tool.
In order to prevent possible movement of the tool that could lead to inaccuracy, I provide methods to lock the tool into place. This can be either by means of a locknut, or via a locking screw that maybe tightened against the centre of the crankshaft, thereby increasing friction in the threads.
Many different extractor thread sizes are used across the huge number of different applicable engines. Some flywheels have internal extractor threads. Some flywheels have a boss with an external thread. Others have a plurality of extractor threads concentric to the crankshaft. Each different thread requires a specific version of the tool.
In order for this method to work accurately the engine must be held level, with the crankshaft rotational axis located in a horizontal plane. Conveniently, this is the normal engine orientation in the vast majority of vehicles.
I have listed many of the common extractor thread sizes at the end of this document. My invention is not limited to those listed and is applicable to any engine with a concentric flywheel extractor thread, or threads, simply by adapting the connecting thread or threads to suit.
The advantage of using the extractor thread, or threads, is that in many cases it is possible to mount the tool without disturbing the crankshaft end nut; which saves time and effort.
Another version of the invention is also provided where the mounting tool for the inclinometer screws directly onto the crankshaft thread in place of the nut on either end of the crankshaft.
This method is less convenient than the extractor thread version since it requires removal and replacement of the crankshaft end nut. It does however offer the advantage that it may also be used on the drive-side end of the crankshaft.
Other versions of the tool are provided which carry several different threads, so one adaptor may be used on many different engine models.
This method of calculating crankshaft angle is quicker and easier than the current methods because the inclinometer does not reference crankshaft position relative to the crankcase - it references rotation in relation to earth gravity - so no separate engine crankcase mount or pointer is required.
The adaptor tool is designed such that on many engine models the flywheel and/or flywheel nut do not need to be removed in advance, saving workshop time.
A digital inclinometer offers considerably higher resolution and accuracy than the traditional degree disc. Most digital inclinometer models permit the display to be zeroed in any position and relative angle measurements can easily be established from any point.
BRIEF DESCRIPTION OF DRAWINGS
Fig 1 is an exploded plan view which shows how one form of the tool mounts to an engine flywheel.
Fig 2 is an exploded plan view of a 4-way version of the tool with central locking screw.
Fig 3 is an exploded plan view of an engine flywheel into which a second form of the invention screws.
Fig 4 is an exploded plan view of an engine crankshaft thread onto which a third form of the invention screws.
Fig 5 is an exploded plan view of an engine flywheel onto which a fourth form of the invention screws.
Fig 6 is an exploded plan view of an engine flywheel onto which a fifth form of the invention screws.
DETAILED DESCRIPTION OF SOME EMBODIMENTS OF THE INVENTION
Fig 1 depicts a simple embodiment of the tool (02) which screws into a concentric internal extractor thread in the flywheel (04). An optional additional locknut (03) is provided to reduce the risk of the tool moving while the crankshaft is being rotated during measurement. In this instance the tool is made of a ferritic material so that the inclinometer (01) may attach by permanent magnets commonly found in these devices.
Fig 2 depicts a 4-way embodiment of the tool (05) with a different thread on each end of the tool in order for one tool to fit many different engines. This embodiment uses a platform for the inclinometer that is offset in respect to the crankshaft centre-line, in order to permit a central pointed Allen screw (06) to be used as a method of locking the tool into position.
Fig 3 depicts an alternate version of the tool (09) with a flat back-plate to which an inclinometer (08) may be attached by means of adhesive, clamping or screws (10).
Fig 4 depicts another version of the tool (11) that screws directly onto the end of the crankshaft (12) in place of the crankshaft end nut.
Fig 5 depicts a version of the tool (13) with an internal thread which screws to a flywheel with an externally-threaded extractor boss (14).
Fig 6 depicts a version of the tool (15) which connects to a flywheel with a plurality of extraction threads (18). It attaches by means of threaded fasteners (16) and suitable stand-offs (17).
All of the versions of the invention include a threaded portion or portions for fastening to the flywheel or crankshaft of an engine, and a mounting surface for attaching a gravity-referencing inclinometer.
In all aforementioned version of the tool, the method for use is the same.
Step 1 is to confirm that the engine is positioned with the crankshaft in a horizontal plane.
Step 2 is to firmly attach the tool to the engine flywheel or crankshaft via the threaded fastener or fasteners.
Step 3 is to securely attach the digital inclinometer to the tool, if not already attached.
Step 4 is to zero the digital display at any given position of crankshaft rotation.
Step 5 is to rotate the crankshaft to a second position whereby the digital inclinometer will give a reading of change of angle relative to the crankshaft position described in step 4.
Below are listed many of the popular thread sizes that would be used for the tools. My invention is not limited to those listed.
EXTERNAL Flywheel puller threads
M 10x1.25 Right hand thread Ml4x1.5 Right hand thread Ml6x1.5 Right hand thread Ml8x1.0 Left hand thread Ml8x1.5 Right hand thread Ml9x1.0 Right hand thread M20xl.0 Right hand thread M20xl.5 Right hand thread M22xl.O Right hand thread M22xl.5 Right hand thread M24xl.O Right hand thread M24xl.O Left hand thread M24xl.5 Right hand thread M25xl.25 Right hand thread M26xl.O Right hand thread M26xl.5 Right hand thread M27xl.O Left hand thread M27xl.O Right hand thread M27xl.25 Right hand thread M28xl.O Right hand thread M28xl.25 Right hand thread M28xl.5 Right hand thread M30xl.5 Right hand thread M33xl.5 Right hand thread
INTERNAL Flywheel puller threads
M24xl.5 Right hand INTERNAL thread M26xl.O Right hand INTERNAL thread M28xl.O Right hand INTERNAL thread M30xl.0 Right hand INTERNAL thread M30xl.25 Right hand INTERNAL thread M30xl.5 Right hand INTERNAL thread M32xl.5 Right hand INTERNAL thread M33xl.5 Right hand INTERNAL thread M35xl.O Right hand INTERNAL thread M35xl.5 Right hand INTERNAL thread M38xl.5 Right hand INTERNAL thread M39xl.5 Right hand INTERNAL thread M40xl.5 Right hand INTERNAL thread M50xl.5 Right hand INTERNAL thread

Claims (17)

1. A tool which fixes to the crankshaft or flywheel of an engine, by means of a threaded fastening, whereby the tool provides a mount for a gravity-referencing inclinometer.
2. The tool of Claim 1, further comprising a flat mounting surface to which, in use, an inclinometer can be attached.
3. A tool of Claim 1, where a flat ferrous surface is provided with its plane perpendicular to the rotational axis of the crankshaft, upon which a magnetic inclinometer can be attached.
4. A tool of Claims 1-3, where the threaded fastening of the tool features a male thread which mates with a female thread concentric to the flywheel.
5. A tool of Claims 1-3 where the threaded fastening of the tool features a male thread fitted with an additional threaded locknut to improve security with the flywheel.
6. A tool of Claims 1-3 where the threaded fastening of the tool features a female thread which screws onto a protruding male-threaded boss on the flywheel.
7. A tool of Claims 1-3 where the tool screws directly onto the crankshaft in place of the normal crankshaft end nut.
8. A tool of Claims 1-3 where the tool fixes to the flywheel using a plurality of extractor threads.
9. A tool of Claims 1-8 where an additional central threaded screw acting on the centre of the crankshaft is used to lock the tool to the flywheel or crankshaft more effectively.
10. A kit including a tool as described in Claims 1-9 together with a gravityreferencing digital inclinometer.
11. A method of establishing crankshaft degree positions using a tool as described in Claims 1-9 together with a gravity-referencing digital inclinometer.
12. A tool of Claims 1-9, containing a permanent magnet for the mounting of a magnetic digital inclinometer.
13. A tool of Claims 1-9, containing an element of a ferrous material for the mounting of a magnetic digital inclinometer.
14. A tool of Claims 1-9, to which a digital inclinometer is attached by screw fastenings.
15. A tool of Claims 1-9, to which a digital inclinometer is attached by means of threaded fastenings.
16. A tool of Claims 1-9, to which a digital inclinometer is attached by means of adhesive.
17. A tool of Claims 1-9, to which a digital inclinometer is attached by means of a clamp.
Intellectual
Property
Office
Application No: GB1700435.9 Examiner: Gareth Jones
GB1700435.9A 2017-01-11 2017-01-11 Tool and method for crankshaft angle calculation Withdrawn GB2558882A (en)

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Application Number Priority Date Filing Date Title
GB1700435.9A GB2558882A (en) 2017-01-11 2017-01-11 Tool and method for crankshaft angle calculation

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Application Number Priority Date Filing Date Title
GB1700435.9A GB2558882A (en) 2017-01-11 2017-01-11 Tool and method for crankshaft angle calculation

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GB201700435D0 GB201700435D0 (en) 2017-02-22
GB2558882A true GB2558882A (en) 2018-07-25

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108568764A (en) * 2018-07-06 2018-09-25 莱芜环球汽车零部件有限公司 A kind of bent axle indexing scribing tooling

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5033292A (en) * 1990-07-06 1991-07-23 Dana Corporation Adapter for facilitating measurements of vehicle drive train components
US5513441A (en) * 1994-12-20 1996-05-07 Dana Corporation Adapter for facilitating measurements of vehicle drive train components
DE10113024A1 (en) * 2001-03-17 2002-10-02 Werner Rogg Measurement of the relative angular positions of vehicle components, especially motor vehicles, using a measurement sensor arrangement that does not require a level measurement stand
EP2128564A1 (en) * 2008-05-30 2009-12-02 Inter Control Hermann Köhler GmbH & Co. KG Sensor casing

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5033292A (en) * 1990-07-06 1991-07-23 Dana Corporation Adapter for facilitating measurements of vehicle drive train components
US5513441A (en) * 1994-12-20 1996-05-07 Dana Corporation Adapter for facilitating measurements of vehicle drive train components
DE10113024A1 (en) * 2001-03-17 2002-10-02 Werner Rogg Measurement of the relative angular positions of vehicle components, especially motor vehicles, using a measurement sensor arrangement that does not require a level measurement stand
EP2128564A1 (en) * 2008-05-30 2009-12-02 Inter Control Hermann Köhler GmbH & Co. KG Sensor casing

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