EP0806549A1 - Tappet in an internal combustion engine and a method of manufacturing it - Google Patents

Tappet in an internal combustion engine and a method of manufacturing it Download PDF

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Publication number
EP0806549A1
EP0806549A1 EP96303151A EP96303151A EP0806549A1 EP 0806549 A1 EP0806549 A1 EP 0806549A1 EP 96303151 A EP96303151 A EP 96303151A EP 96303151 A EP96303151 A EP 96303151A EP 0806549 A1 EP0806549 A1 EP 0806549A1
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EP
European Patent Office
Prior art keywords
outer circumferential
circumferential surface
core material
helical groove
tappet
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.)
Granted
Application number
EP96303151A
Other languages
German (de)
French (fr)
Other versions
EP0806549B1 (en
Inventor
Nuobo Hara
Tatsuo Kanzaki
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.)
Fuji Oozx Inc
Original Assignee
Fuji Oozx Inc
Fuji Valve Co Ltd
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 Fuji Oozx Inc, Fuji Valve Co Ltd filed Critical Fuji Oozx Inc
Priority to EP00200571A priority Critical patent/EP1004753B1/en
Priority to EP19960303151 priority patent/EP0806549B1/en
Priority to DE1996613959 priority patent/DE69613959T2/en
Publication of EP0806549A1 publication Critical patent/EP0806549A1/en
Application granted granted Critical
Publication of EP0806549B1 publication Critical patent/EP0806549B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12Transmitting gear between valve drive and valve
    • F01L1/14Tappets; Push rods
    • F01L1/143Tappets; Push rods for use with overhead camshafts

Definitions

  • the present invention relates to a tappet in an internal combustion engine and a method of manufacturing it.
  • a helical groove 13 is formed on the outer circumferential surface of raw material for a tappet to make a core material 15, the surface of which is thermally sprayed by wear resistant material such as Fe metal to form a coating layer 17 which covers the helical groove 13.
  • the outer circumferential surface of the coating layer is ground to form a cylindrical portion 18, the end 19 of which is chamfered.
  • the cylindrical wear resistant coating layer 17 in which the groove 13 of the core material 15 is embedded is slightly left as a fine string-like portion 16, which is likely to peel off as small pieces.
  • a tappet in an internal combustion engine comprising a core material having a helical groove on the outer circumferential surface and a wear resistant coating layer which covers the outer circumferential surface of the core material, the end of the outer circumfential surface being chamfered, characterized in that in the vicinity of the end of the outer circumferential surface, said helical groove gradually becomes smaller in diameter toward the end, thereby preventing peaks of the helical groove from being exposed over the outer circumferential surface of said coating layer.
  • a tappet in an internal combustion engine comprising a core material having a helical groove on the outer circumferential surface and a wear resistant coating layer which covers the outer circumferential surface of the core material, the end of the outer circumfential surface being chamfered, characterized in that the end of said helical groove is terminated at a position slightly spaced from the end of the core, an annular groove being formed at the end of the helical groove, thereby preventing peaks of the helical groove from being exposed over the outer circumferential surface of said coating layer.
  • a tappet in an internal combustion engine comprising a core material having a helical groove on the outer circumferential surface and a wear resistant coating layer which covers the outer circumferential surface of the core material, the end of the outer circumfential surface being chamfered, characterized in that in the vicinity of the end of the outer circumferential surface, said helical groove gradually becomes smaller in diameter toward the end, the end of said helical groove is terminated at a position slightly spaced from the end of the core, an annular groove being formed at the end of the helical groove, thereby preventing peaks of the helical groove from being exposed over the outer circumferential surface of said coating layer.
  • a method of manufacturing a tappet in an internal combustion engine comprising the steps of forming a helical groove on the outer circumferential surface of a core material so that the groove may become smaller in diameter in the vicinity of the end of the core material; covering the outer circumferential surface with a wear resistant coating layer; and forming the outer circumferantial surface to an cylindrical surface, at least the end of the cylindrical surface being chamfered.
  • a method of manufacturing a tappet in an internal combustion engine comprising the steps of contacting the outer circumferential surface of a cylindrical core material with a cutting tool to give feed in an axial direction to form a helical groove on the outer circumferential surface of the core material while the core material is rotated on an axis; stopping the feed of the cutting tool when the helical groove reaches in the vicinity of the end of the core material to form an annular groove at the end of the helical groove; overing the outer circumferential surface of the core material with wear resistant coating layer; and finishing the outer circumferential surface to a cylindrical surface, at least the end of the cylindrical surface being chamfered.
  • a method of manufacturing a tappet in an internal combustion engine comprising the steps of contacting the outer circumferential surface of a core material with a cutting tool to give it feed in an axial direction while the core material is rotated on an axis; giving feed to the cutting tool toward the axis in the vicinity of the end of said core material to form a helical groove which gradually becomes smaller in diameter as it becomes closer to the end of the core material; stopping the feed of the cutting tool when the helical groove reaches to a predetermined position closer to the end of the core material to form an annular groove at then end of the helical groove; covering the outer circumferential surface with a wear resistant coating layer; and finishing the outer circumferential surface of the coating layer to a cylindrical surface, at least said end of the cylindrical surface being chamfered.
  • the helical groove gradually becomes smaller in diameter toward the end in the vicinity of the end of the core material, thereby preventing the helical groove from being exposed over the coating layer even if the upper and lower ends of the coating layer are chamfered.
  • the end of the helical groove is stopped before the end of the core material, and is connected with the annular groove, thereby preventing removal even if the chamfered portion is exposed owing to corrosion.
  • the tappet according to the present invention comprises the core material in which the helical groove is formed on the outer circumferential surface, and the wear resistant coating layer with which the outer circumferential surface is covered and the ends are chamfered, thereby providing a light weight body and relatively small inertia force, so that response and followability to reciprocal movement is improved. Furthermore; owing to wear resistance in frictional portion, durability will increase.
  • the groove of the core material is completely covered with the coating layer other than upper and lower ends, thereby avoiding thinner string portions as in a conventional ones and removal thereof.
  • metal thermal spraying it is suggested that the core material is immersed in melted metal, or plating is applied, but metal thermal spraying is more convenient and economical.
  • a cylindrical raw material 1 of light metal such as Al as shown in Fig. 1 is rotated on an axis , while a cutting tool contacts the outer circumferential surface 12. Feed is axially given by the cutting tool to form a helical groove 3 on the outer circumferential surface of the raw material 1. At the same time, adjacent to the raw material 1, additional feed is given to the cutting tool toward the axis so that the helical groove 3 gradually decreases in diameter toward the end of the raw material 1.
  • Fig. 6 illustrates the second embodiment of a tappet according to the present invention.
  • feeds are given to the cutting tool in an axial direction and toward the axis, and the raw material 1 is immediately ground to the end thereof without stopping the feeds at near the end of the material 1, so that the helical groove 3 is formed all over the outer circumferential surface 1, and similar way to the first embodiment is then made.
  • the peaks 10 in the helical groove 3 of the material 5 are not exposed over the outer circumferential surface 8 of the coating layer 7.
  • the same numerals are alotted to the same members and parts in the first embodiment, and the details thereof are omitted.
  • Fig. 7 illustrates the third embodiment of a tappet according to the present invention.
  • feed is given to the cutting tool only in an axial direction, not toward the axis, so that the raw material is ground.
  • feed of the cutting tool is stopped, and terminates at a position slightly spaced from the end of the material 1. thereby forming a helical groove 3 having an annular groove 3a at the terminating end then a tappet is made by a way similar to the first embodiment.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

A tappet is used in an internal combustion engine of vehicles. A core material of the tappet has a helical groove on the outer circumferential surface, and a wear resistant coating layer the ends of which are chamfered. In the vicinity of the end of the core material, the helical groove gradually becomes smaller toward the end, thereby preventing peaks of the helical groove from exposure to the outside.

Description

    BACKGROUND OF THE INVENTION
  • The present invention relates to a tappet in an internal combustion engine and a method of manufacturing it.
  • For example, to increase wear resistance of a conventional tappet, as shown in Fig. 8, a helical groove 13 is formed on the outer circumferential surface of raw material for a tappet to make a core material 15, the surface of which is thermally sprayed by wear resistant material such as Fe metal to form a coating layer 17 which covers the helical groove 13. The outer circumferential surface of the coating layer is ground to form a cylindrical portion 18, the end 19 of which is chamfered.
  • However, at the chamfered end of the tappet, as clearly shown in Fig. 9, the cylindrical wear resistant coating layer 17 in which the groove 13 of the core material 15 is embedded is slightly left as a fine string-like portion 16, which is likely to peel off as small pieces.
  • SUMMARY OF THE INVENTION
  • It is an object of the present invention to provide a tappet in an internal combustion engine in which a core material which has a helical groove on the outer circumferential surface is covered with wear resistant material, thereby preventing a fine string portion of a coating layer from peeling off at the chamfered end.
  • It is another object of the present invention to provide a method of manufacturing a tappet in an internal combustion engine economically.
  • According to one aspect of the present invention, there is provided a tappet in an internal combustion engine, the tappet comprising a core material having a helical groove on the outer circumferential surface and a wear resistant coating layer which covers the outer circumferential surface of the core material, the end of the outer circumfential surface being chamfered, characterized in that in the vicinity of the end of the outer circumferential surface, said helical groove gradually becomes smaller in diameter toward the end, thereby preventing peaks of the helical groove from being exposed over the outer circumferential surface of said coating layer.
  • According to another aspect of the present invention, there is provided a tappet in an internal combustion engine, the tappet comprising a core material having a helical groove on the outer circumferential surface and a wear resistant coating layer which covers the outer circumferential surface of the core material, the end of the outer circumfential surface being chamfered, characterized in that the end of said helical groove is terminated at a position slightly spaced from the end of the core, an annular groove being formed at the end of the helical groove, thereby preventing peaks of the helical groove from being exposed over the outer circumferential surface of said coating layer.
  • According to a further aspect of the present invention, there is provided a tappet in an internal combustion engine, the tappet comprising a core material having a helical groove on the outer circumferential surface and a wear resistant coating layer which covers the outer circumferential surface of the core material, the end of the outer circumfential surface being chamfered, characterized in that in the vicinity of the end of the outer circumferential surface, said helical groove gradually becomes smaller in diameter toward the end, the end of said helical groove is terminated at a position slightly spaced from the end of the core, an annular groove being formed at the end of the helical groove, thereby preventing peaks of the helical groove from being exposed over the outer circumferential surface of said coating layer.
  • According to yet another aspect of the present invention, there is provided a method of manufacturing a tappet in an internal combustion engine, the method comprising the steps of forming a helical groove on the outer circumferential surface of a core material so that the groove may become smaller in diameter in the vicinity of the end of the core material; covering the outer circumferential surface with a wear resistant coating layer; and forming the outer circumferantial surface to an cylindrical surface, at least the end of the cylindrical surface being chamfered.
  • According to a still further aspect of the present invention, there is provided a method of manufacturing a tappet in an internal combustion engine, the method comprising the steps of contacting the outer circumferential surface of a cylindrical core material with a cutting tool to give feed in an axial direction to form a helical groove on the outer circumferential surface of the core material while the core material is rotated on an axis; stopping the feed of the cutting tool when the helical groove reaches in the vicinity of the end of the core material to form an annular groove at the end of the helical groove; overing the outer circumferential surface of the core material with wear resistant coating layer; and finishing the outer circumferential surface to a cylindrical surface, at least the end of the cylindrical surface being chamfered.
  • According to an additional aspect of the present invention, there is provided a method of manufacturing a tappet in an internal combustion engine, the method comprising the steps of contacting the outer circumferential surface of a core material with a cutting tool to give it feed in an axial direction while the core material is rotated on an axis; giving feed to the cutting tool toward the axis in the vicinity of the end of said core material to form a helical groove which gradually becomes smaller in diameter as it becomes closer to the end of the core material; stopping the feed of the cutting tool when the helical groove reaches to a predetermined position closer to the end of the core material to form an annular groove at then end of the helical groove; covering the outer circumferential surface with a wear resistant coating layer; and finishing the outer circumferential surface of the coating layer to a cylindrical surface, at least said end of the cylindrical surface being chamfered.
  • The helical groove gradually becomes smaller in diameter toward the end in the vicinity of the end of the core material, thereby preventing the helical groove from being exposed over the coating layer even if the upper and lower ends of the coating layer are chamfered.
  • The end of the helical groove is stopped before the end of the core material, and is connected with the annular groove, thereby preventing removal even if the chamfered portion is exposed owing to corrosion.
  • The tappet according to the present invention comprises the core material in which the helical groove is formed on the outer circumferential surface, and the wear resistant coating layer with which the outer circumferential surface is covered and the ends are chamfered, thereby providing a light weight body and relatively small inertia force, so that response and followability to reciprocal movement is improved. Furthermore; owing to wear resistance in frictional portion, durability will increase.
  • The groove of the core material is completely covered with the coating layer other than upper and lower ends, thereby avoiding thinner string portions as in a conventional ones and removal thereof.
  • Instead of metal thermal spraying, it is suggested that the core material is immersed in melted metal, or plating is applied, but metal thermal spraying is more convenient and economical.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • The features and advantages of the invention will become more apparent from the following description of embodiments with respect to appended drawings wherein:
    • Fig. 1 is a partially sectioned front view of the first embodiment of a tappet according to the present invention;
    • Fig. 2 is a partially sectioned front view which shows a core material in which a helical groove is formed on the outer circumferential surface;
    • Fig. 3 is a partially sectioned front view in which a coating layer is applied by metal thermal spraying on the outer circumferential surface of the core material in Fig. 2;
    • Fig. 4 is a partially sectioned front view of the first embodiment of a finished tappet in which the outer circumferential surface is ground and the upper and lower ends are chamfered to the one in Fig. 3;
    • Fig. 5 is an enlarged sectional view of the lower portion of the section in Fig. 4;
    • Fig. 6 is an enlarged sectional view of the lower portion in the second embodiment of the present invention;
    • Fig. 7 is an enlarged sectional view of the lower portion in the third embodiment of the present invention;
    • Fig. 8 is an enlarged sectional view of the lower portion of a conventional tappet; and
    • Fig. 9 is perspective view which is seen from one end of the conventional tappet.
    DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • A cylindrical raw material 1 of light metal such as Al as shown in Fig. 1 is rotated on an axis , while a cutting tool contacts the outer circumferential surface 12. Feed is axially given by the cutting tool to form a helical groove 3 on the outer circumferential surface of the raw material 1. At the same time, adjacent to the raw material 1, additional feed is given to the cutting tool toward the axis so that the helical groove 3 gradually decreases in diameter toward the end of the raw material 1.
  • When the helical groove 3 reaches to a predetermined position which is close to the end of the raw material 1, the feed of the cutting tool is stopped to form an annular groove 3a at the end of the helical groove 3, thereby forming a core material 5.
  • Then, as shown in Fig. 3, Fe metal is thermally sprayed to all over the outer circumferential surface of the core material 5 to form a wear resistant coating layer 7. Thereafter, as shown in Fig. 4, the outer circumferential surface 8 is ground to form a circumference, and the upper and lower ends are chamfered, thereby forming a tappet as shown in Fig. 5 in the first embodiment. Therefore, peaks 10 in the helical groove 3 of the material 5 are not exposed over the outer circumferential surface 8 of the coating layer 7.
  • Fig. 6 illustrates the second embodiment of a tappet according to the present invention. In the second embodiment, in the vicinity of the end of the raw material 1, feeds are given to the cutting tool in an axial direction and toward the axis, and the raw material 1 is immediately ground to the end thereof without stopping the feeds at near the end of the material 1, so that the helical groove 3 is formed all over the outer circumferential surface 1, and similar way to the first embodiment is then made. The peaks 10 in the helical groove 3 of the material 5 are not exposed over the outer circumferential surface 8 of the coating layer 7. The same numerals are alotted to the same members and parts in the first embodiment, and the details thereof are omitted.
  • Fig. 7 illustrates the third embodiment of a tappet according to the present invention. In this embodiment, feed is given to the cutting tool only in an axial direction, not toward the axis, so that the raw material is ground. When the cutting tool reaches to a predetermined position in the vicinity of the end of the raw material, feed of the cutting tool is stopped, and terminates at a position slightly spaced from the end of the material 1. thereby forming a helical groove 3 having an annular groove 3a at the terminating end then a tappet is made by a way similar to the first embodiment.
  • The foregoings merely relate to embodiments of the present invention. Various changes and modifications may be made by person skilled in the art without departing from the scope of claims wherein:

Claims (6)

  1. A tappet in an internal combustion engine, the tappet comprising a core material having a helical groove on an outer circumferential surface and a wear resistant coating layer which covers the outer circumferential surface of the core material, an end of the outer circumfential surface being chamfered, characterized in that:
    in the vicinity of the end of the outer circumferential surface, said helical groove gradually becomes smaller in diameter toward the end, thereby preventing peaks of the helical groove from being exposed over an outer circumferential surface of said coating layer.
  2. A tappet in an internal combustion engine, the tappet comprising a core material having a helical groove on an outer circumferential surface and a wear resistant coating layer which covers the outer circumferential surface of the core material, an end of the outer circumfential surface being chamfered, characterized in that:
    an end of said helical groove is terminated at a position slightly spaced from the end of the core, an annular groove being formed at the end of the helical groove, thereby preventing peaks of the helical groove from being exposed over an outer circumferential surface of said coating layer.
  3. A tappet in an internal combustion engine, the tappet comprising a core material having a helical groove on an outer circumferential surface and a wear resistant coating layer which covers the outer circumferential surface of the core material, an end of the outer circumfential surface being chamfered, characterized in that:
    in the vicinity of the end of the outer circumferential surface, said helical groove gradually becomes smaller in diameter toward the end, an end of said helical groove is terminated at a position slightly spaced from the end of the core, an annular groove being formed at the end of the helical groove, thereby preventing peaks of the helical groove from being exposed over an outer circumferential surface of said coating layer.
  4. A method of manufacturing a tappet in an internal combustion engine, the method comprising the steps of:
    forming a helical groove on an outer circumferential surface of a core material so that the groove may become smaller in diameter in the vicinity of an end of the core material;
    covering the outer circumferential surface with a wear resistant coating layer; and
    forming the outer circumferantial surface to a cylindrical surface, at least the end of the cylindrical surface being chamfered.
  5. A method of manufacturing a tappet in an internal combustion engine, the method comprising the steps of:
    contacting an outer circumferential surface of a cylindrical core material with a cutting tool to give feed in an axial direction to form a helical groove on the outer circumferential surface of the core material while the core material is rotated on an axis;
    stopping the feed of the cutting tool when the helical groove reaches in the vicinity of an end of the core material to form an annular groove at the end of the helical groove;
    covering the outer circumferential surface of the core material with wear resistant coating layer; and
    finishing the outer circumferential surface to a cylindrical surface, at least the end of the cylindrical surface being chamfered.
  6. A method of manufacturing a tappet in an internal combustion engine, the method comprising the steps of:
    contacting an outer circumferential surface of a core material with a cutting tool to give it feed in an axial direction while the core material is rotated on an axis;
    giving feed to the cutting tool toward the axis in the vicinity of an end of said core material to form a helical groove which gradually becomes smaller in diameter as it becomes closer to the end of the core material;
    stopping the feed of the cutting tool when the helical groove reaches to a predetermined position closer to the end of the core material to form an annular groove at then end of the helical groove;
    covering the outer circumferential surface with a wear resistant coating layer; and
    finishing an outer circumferential surface of the coating layer to a cylindrical surface, at least said end of the cylindrical surface being chamfered.
EP19960303151 1996-05-03 1996-05-03 Tappet in an internal combustion engine and a method of manufacturing it Expired - Lifetime EP0806549B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP00200571A EP1004753B1 (en) 1996-05-03 1996-05-03 Tappet in an internal combustion engine and a method of manufacturing it
EP19960303151 EP0806549B1 (en) 1996-05-03 1996-05-03 Tappet in an internal combustion engine and a method of manufacturing it
DE1996613959 DE69613959T2 (en) 1996-05-03 1996-05-03 Valve tappet of an internal combustion engine and manufacturing process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19960303151 EP0806549B1 (en) 1996-05-03 1996-05-03 Tappet in an internal combustion engine and a method of manufacturing it

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP00200571A Division EP1004753B1 (en) 1996-05-03 1996-05-03 Tappet in an internal combustion engine and a method of manufacturing it

Publications (2)

Publication Number Publication Date
EP0806549A1 true EP0806549A1 (en) 1997-11-12
EP0806549B1 EP0806549B1 (en) 2001-07-18

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EP00200571A Expired - Lifetime EP1004753B1 (en) 1996-05-03 1996-05-03 Tappet in an internal combustion engine and a method of manufacturing it
EP19960303151 Expired - Lifetime EP0806549B1 (en) 1996-05-03 1996-05-03 Tappet in an internal combustion engine and a method of manufacturing it

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP00200571A Expired - Lifetime EP1004753B1 (en) 1996-05-03 1996-05-03 Tappet in an internal combustion engine and a method of manufacturing it

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DE (1) DE69613959T2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013206011A1 (en) 2013-04-05 2014-10-09 Schaeffler Technologies Gmbh & Co. Kg Plunger for valve or pump actuation and method of manufacturing a plunger for valve or pump actuation

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3715790A (en) * 1971-01-13 1973-02-13 Trw Inc Method of reinforcing piston ring grooves
DE3627505A1 (en) * 1986-08-13 1988-02-18 Motomak Self-adjusting hydraulic valve tappet
GB2245327A (en) * 1990-05-17 1992-01-02 T & N Technology Ltd Tappets

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07310508A (en) * 1994-05-19 1995-11-28 Fuji Oozx Inc Tappet for internal combustion engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3715790A (en) * 1971-01-13 1973-02-13 Trw Inc Method of reinforcing piston ring grooves
DE3627505A1 (en) * 1986-08-13 1988-02-18 Motomak Self-adjusting hydraulic valve tappet
GB2245327A (en) * 1990-05-17 1992-01-02 T & N Technology Ltd Tappets

Also Published As

Publication number Publication date
DE69613959T2 (en) 2001-12-20
EP1004753A1 (en) 2000-05-31
DE69613959D1 (en) 2001-08-23
EP0806549B1 (en) 2001-07-18
EP1004753B1 (en) 2002-03-06

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