Fuel pump driving structure and internal combustion engine
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02M-037/06
F02M-039/02
F02F-001/24
F02F-007/00
F01L-001/46
F02M-059/44
F04C-029/00
F01L-001/053
출원번호
US-0241486
(2011-09-09)
등록번호
US-8887694
(2014-11-18)
국제출원번호
PCT/JP2011/005080
(2011-09-09)
§371/§102 date
20140227
(20140227)
국제공개번호
WO2013/035137
(2013-03-14)
발명자
/ 주소
Hada, Masatoshi
Kinoshita, Naonori
Yamazaki, Miyuki
Mitsuhashi, Tsuneo
출원인 / 주소
Aichi Machine Industry Co., Ltd.
대리인 / 주소
Global IP Counselors
인용정보
피인용 횟수 :
0인용 특허 :
10
초록▼
The fuel pump driving structure includes a camshaft and a pump cam member. The camshaft is rotatably supported at an end by a cylinder head. The pump cam member has a fitting hole into which the end of the camshaft is press fitted, and is operatively coupled to a high-pressure fuel pump. The pump ca
The fuel pump driving structure includes a camshaft and a pump cam member. The camshaft is rotatably supported at an end by a cylinder head. The pump cam member has a fitting hole into which the end of the camshaft is press fitted, and is operatively coupled to a high-pressure fuel pump. The pump cam member includes a pump cam section and a first contact section. The pump cam section has a first lift portion operating the high-pressure fuel pump, and a base circular portion that does not operate the high-pressure fuel pump. The first contact section is in a position offset from a position of the first lift portion with respect to a circumferential direction and contacting a portion of the camshaft in an axial direction at a position radially outward of an external circumferential surface of the one end of the camshaft.
대표청구항▼
1. A fuel pump driving structure configured to drive a high-pressure fuel pump of an internal combustion engine, the fuel pump driving structure comprising: a camshaft configured and arranged to be rotatably supported at an end by a cylinder head of the internal combustion engine; anda pump cam memb
1. A fuel pump driving structure configured to drive a high-pressure fuel pump of an internal combustion engine, the fuel pump driving structure comprising: a camshaft configured and arranged to be rotatably supported at an end by a cylinder head of the internal combustion engine; anda pump cam member having an internal circumference surface defining a fitting hole into which the end of the camshaft is press fitted, and configured to be operatively coupled to the high-pressure fuel pump to drive the high-pressure fuel pump, the pump cam member includinga pump cam section having a first lift portion configured to operate the high-pressure fuel pump, and a base circular portion configured so as to not operate the high-pressure fuel pump, anda first contact section arranged in a position offset from a position of the first lift portion with respect to a circumferential direction, and contacting a portion of the camshaft in an axial direction of the camshaft at a position radially outward of an external circumferential surface of the one end of the camshaft so as to reduce bending of the camshaft where the pump cam member is mounted. 2. The fuel pump driving structure recited in claim 1, wherein the end of the camshaft has a camshaft journal section configured and arranged to be supported directly by a camshaft bearing section of the cylinder head, and an extended distal end section extending from the camshaft journal section and having a diameter smaller than a diameter of the camshaft journal section such that a step surface is between an external circumferential surface of the camshaft journal section and an external circumferential surface of the extended distal end section, andthe first contact section contacts the step surface. 3. The fuel pump driving structure recited in claim 2, wherein the external circumference surface of the extended distal end section of the camshaft includes spline protrusions, andthe internal circumference surface of the pump cam member includes spline recesses corresponding to the spline protrusions of the camshaft so that the pump cam member and the camshaft are fixedly joined together with a splined press fit. 4. The fuel pump driving structure recited in claim 1, wherein the pump cam member further includes a boss section disposed adjacent to the pump cam section with an external circumference surface of the boss section forming a pump cam journal portion so that the end of the camshaft is indirectly supported on a pump cam bearing section of the cylinder head via the pump cam journal portion, the boss section and the pump cam section being integrally formed as a one-piece, unitary member. 5. The fuel pump driving structure recited in claim 4, wherein the first contact section protrudes in the axial direction from a surface of the boss section disposed on an opposite side from the pump cam section. 6. The fuel pump driving structure recited in claim 4, wherein the camshaft includes a bulged section expanding outward in a radial direction, andthe first contact section contacts an axial end surface of the bulged section of the camshaft. 7. The fuel pump driving structure recited in claim 4, wherein the camshaft has a camshaft journal section arranged axially adjacent to the end of the camshaft, the camshaft journal section being configured and arranged to be supported by a camshaft bearing section of the cylinder head, andthe pump cam journal portion of the boss section has a diameter substantially equal to a diameter of the camshaft journal section of the camshaft. 8. The fuel pump driving structure recited in claim 4, wherein the external circumference surface of the end of the camshaft includes spline protrusions, andthe internal circumference surface of the pump cam member includes spline recesses corresponding to the spline protrusions of the camshaft so that the pump cam member and the camshaft are fixedly joined together with a splined press fit. 9. The fuel pump driving structure recited in claim 1, wherein the pump cam section further includes a second lift portion and a third lift portion with the first, second and third lift portions being disposed with equal spacing around a circumference of the pump cam section, andthe pump cam member further includes a second contact section and a third contact section arranged in positions offset from positions of the second lift portion and the third lift portion, respectively, with respect to the circumferential direction. 10. An internal combustion engine including the fuel pump driving structure recited in claim 1, and configured to convert reciprocating motion of a piston due to a combustion energy generated by explosive combustion of an air-fuel mixture into a rotational movement of a crankshaft, the internal combustion engine comprising: the high-pressure fuel pump operatively coupled to the fuel pump driving structure;a fuel injection section configured and arranged to inject fuel that has been pressurized by the high-pressure fuel pump with the fuel pump driving structure into a combustion chamber; anda spark ignition section configured and arranged to spark-ignite the air-fuel mixture including the fuel injected by the fuel injection section in the combustion chamber to cause the explosive combustion of the air-fuel mixture. 11. The fuel pump driving structure recited in claim 5, wherein the camshaft includes a bulged section expanding outward in a radial direction, and the first contact section contacts an axial end surface of the bulged section of the camshaft. 12. The fuel pump driving structure recited in claim 5, wherein the camshaft has a camshaft journal section arranged axially adjacent to the end of the camshaft, the camshaft journal section being configured and arranged to be supported by a camshaft bearing section of the cylinder head, andthe pump cam journal portion of the boss section has a diameter substantially equal to a diameter of the camshaft journal section of the camshaft. 13. The fuel pump driving structure recited in claim 6, wherein the camshaft has a camshaft journal section arranged axially adjacent to the end of the camshaft, the camshaft journal section being configured and arranged to be supported by a camshaft bearing section of the cylinder head, andthe pump cam journal portion of the boss section has a diameter substantially equal to a diameter of the camshaft journal section of the camshaft. 14. The fuel pump driving structure recited in claim 7, wherein the external circumference surface of the end of the camshaft includes spline protrusions, andthe internal circumference surface of the pump cam member includes spline recesses corresponding to the spline protrusions of the camshaft so that the pump cam member and the camshaft are fixedly joined together with a splined press fit. 15. The fuel pump driving structure recited in claim 8, wherein the pump cam section further includes a second lift portion and a third lift portion with the first, second and third lift portions being disposed with equal spacing around a circumference of the pump cam section, andthe pump cam member further includes a second contact section and a third contact section arranged in positions offset from positions of the second lift portion and the third lift portion, respectively, with respect to the circumferential direction. 16. An internal combustion engine including the fuel pump driving structure recited in claim 9, and configured to convert reciprocating motion of a piston due to a combustion energy generated by explosive combustion of an air-fuel mixture into a rotational movement of a crankshaft, the internal combustion engine comprising: the high-pressure fuel pump operatively coupled to the fuel pump driving structure;a fuel injection section configured and arranged to inject fuel that has been pressurized by the high-pressure fuel pump with the fuel pump driving structure into a combustion chamber; anda spark ignition section configured and arranged to spark-ignite the air-fuel mixture including the fuel injected by the fuel injection section in the combustion chamber to cause the explosive combustion of the air-fuel mixture.
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