IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0994291
(2004-11-23)
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등록번호 |
US-7311087
(2007-12-25)
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발명자
/ 주소 |
- Shaull,Anthony A.
- Thayer,Wesley R.
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
7 인용 특허 :
19 |
초록
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A fuel pump for an internal combustion engine including a fuel pump housing, a cylindrical bore having a central axis and being defined by a bore wall surface, a receiving hole formed in the housing, and a tappet assembly received in the cylinder bore. The tappet assembly includes an outer periphera
A fuel pump for an internal combustion engine including a fuel pump housing, a cylindrical bore having a central axis and being defined by a bore wall surface, a receiving hole formed in the housing, and a tappet assembly received in the cylinder bore. The tappet assembly includes an outer peripheral surface with an elongated key slot longitudinally extending parallel to the central axis. A guide key partially received in the receiving hole is provided, the guide key including a head that extends into the cylindrical bore to engage the elongated key slot of the tappet assembly. The head has an outer dimension that is larger than a dimension of the receiving hole along the central axis. Methods for guiding a reciprocating tappet assembly in a fuel pump and assembling a fuel pump are also provided.
대표청구항
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We claim: 1. A fuel pump for an internal combustion engine comprising: a fuel pump housing; a cylindrical bore provided in said fuel pump housing, said cylindrical bore having a central axis, and being at least partially defined by a bore wall surface of said fuel pump housing; a receiving hole for
We claim: 1. A fuel pump for an internal combustion engine comprising: a fuel pump housing; a cylindrical bore provided in said fuel pump housing, said cylindrical bore having a central axis, and being at least partially defined by a bore wall surface of said fuel pump housing; a receiving hole formed in said fuel pump housing, said receiving hole being open to said cylindrical bore; a tappet assembly received in said cylindrical bore, said tappet assembly including an outer peripheral surface with an elongated key slot longitudinally extending parallel to said central axis of said cylindrical bore; and a guide key partially received in said receiving hole and including a head that extends into said cylindrical bore to engage said elongated key slot of said tappet assembly, said head having an outer dimension along said central axis of said cylindrical bore that is larger than a dimension of said receiving hole along said central axis. 2. The fuel pump of claim 1, wherein said head of said guide key includes at least one extension sized to be received in said elongated key slot. 3. The fuel pump of claim 1, wherein said head of said guide key includes a support surface that contacts said bore wall surface. 4. The fuel pump of claim 1, wherein said receiving hole extends substantially perpendicular to said central axis, and said guide key includes a body that is at least partially received in said receiving hole. 5. The fuel pump of claim 4, wherein said body of said guide key has an enlarged portion having a circular cross section with a diameter that is larger than a diameter of said receiving hole so that said guide key is pressed into said receiving hole. 6. The fuel pump of claim 5, wherein said body of said guide key further includes a reduced portion having a circular cross section with a diameter that is smaller than said diameter of said receiving hole, and a chamfer between said reduced portion and said enlarged portion. 7. The fuel pump of claim 4, wherein said guide key has a substantially T-shape in which said head includes two extensions that extend perpendicular to said body and extend diametrically opposed to one another in relation to said body. 8. The fuel pump of claim 4, wherein said receiving hole is a through-hole extending through said fuel pump housing. 9. The fuel pump of claim 4, wherein said receiving hole is a blind hole open to said cylindrical bore. 10. A method for guiding a reciprocating tappet assembly in a fuel pump comprising: providing a fuel pump housing with a cylindrical bore having a central axis and being at least partially defined by a bore wall surface of said fuel pump housing; forming a receiving hole in said fuel pump housing, said receiving hole being open into said cylindrical bore; providing a guide key with a head that extends into said cylindrical bore, said head having an outer dimension along said central axis of said cylindrical bore that is larger than a dimension of said receiving hole along said central axis; inserting at least a portion of said guide key into said receiving hole; providing a tappet assembly received in said cylinder bore, said tappet assembly including an outer peripheral surface and an elongated key slot longitudinally extending parallel to said central axis of said cylinder bore; and maintaining rotational positioning of said tappet assembly in said cylindrical bore by receiving said head of said guide key in said elongated key slot of said tappet assembly. 11. The method of claim 10, wherein said head of said guide key includes at least one extension that is slidably received in said elongated key slot to reduce contact stress exerted on said head as said tappet assembly is reciprocally displaced in said cylindrical bore. 12. The method of claim 10, wherein said head includes a support surface that contacts said bore wall surface, and said method further includes at least partially distributing bending stress exerted on said guide key to said bore wall surface through said support surface as said tappet assembly is reciprocally displaced in said cylindrical bore. 13. The method of claim 10, wherein said guide key includes a body having at least a portion with a circular cross section and a diameter larger than a diameter of said receiving hole, said method further including pressing in said body of said guide key into said receiving hole. 14. The method of claim 13, wherein said body of said guide key further includes a reduced portion having a circular cross section with a diameter that is smaller than said diameter of said receiving hole, and a chamfer between said reduced portion and said enlarged portion. 15. The method of claim 13, wherein said guide key has a T-shape in which said head comprises two extensions that extend perpendicularly to said body, and extend diametrically opposed to one another in relation to said body. 16. The method of claim 10, wherein said formed receiving hole is a through-hole. 17. The method of claim 10, wherein said formed receiving hole is a blind hole open to said cylindrical bore. 18. A method of assembling a fuel pump comprising: providing a fuel pump housing with a cylindrical bore having a central axis and being at least partially defined by a bore wall surface of said fuel pump housing; forming a receiving hole in said fuel pump housing, said receiving hole being open into said cylindrical bore; providing a guide key having a head and a body, said head having an outer dimension along said central axis of said cylindrical bore that is larger than a dimension of said receiving hole along said central axis; inserting said body of said guide key into said receiving hole in a manner that said head of said guide key extends into said cylindrical bore; providing a tappet assembly including an outer peripheral surface and an elongated key slot extending longitudinally on said outer peripheral surface; and inserting said tappet assembly into said cylindrical bore with said key slot positioned to receive said head of said guide key therein to maintain rotational positioning of said tappet assembly. 19. The method of claim 18, wherein said head of said guide key includes at least one extension that is slidably received in said elongated key slot to reduce contact stress exerted on said head as said tappet assembly is reciprocally displaced in said cylindrical bore. 20. The method of claim 18, wherein said head of said guide key includes a support surface that contacts said bore wall surface, and said method further includes at least partially distributing bending stress exerted on said guide key as said tappet assembly is reciprocally displaced in said cylindrical bore to said bore wall surface through said support surface. 21. The method of claim 18, wherein said body of said guide key has at least a portion with a circular cross section having a diameter larger than a diameter of said receiving hole, said method further including press fitting said body of said guide key into said receiving hole. 22. The method of claim 20, wherein said body of said guide key further includes a reduced portion having a circular cross section with a diameter that is smaller than said diameter of said receiving hole, and a chamfer between said reduced portion and said enlarged portion. 23. The method of claim 18, wherein said guide key has a T-shape in which said head includes two extensions that extend perpendicular to said body and extend diametrically opposed to one another in relation to said body. 24. The method of claim 18, wherein said receiving hole is a through-hole extending through said fuel pump housing. 25. The method of claim 18, wherein said formed receiving hole is a blind hole open to said cylindrical bore.
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