Crankcase structure for an internal combustion engine
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02B-075/22
F02B-075/00
출원번호
UP-0902656
(2007-09-24)
등록번호
US-7757655
(2010-08-09)
우선권정보
JP-2006-261277(2006-09-26)
발명자
/ 주소
Inui, Hiroatsu
Sumi, Hiromi
Kittaka, Eiji
출원인 / 주소
Honda Motor Co., Ltd.
대리인 / 주소
Birch, Stewart, Kolasch & Birch, LLP
인용정보
피인용 횟수 :
6인용 특허 :
1
초록▼
A crankcase structure of an internal combustion engine has a desirable shaft support achieved by maintaining the strength of a side wall of a crankcase at a high level without increasing the weight and the size of the internal combustion engine even when the internal combustion engine has an output
A crankcase structure of an internal combustion engine has a desirable shaft support achieved by maintaining the strength of a side wall of a crankcase at a high level without increasing the weight and the size of the internal combustion engine even when the internal combustion engine has an output shaft projecting from the crankcase. A crankcase structure has a crankshaft and a counter shaft that are rotatably supported on a partitioning plane of a crankcase. A main shaft is oriented in the fore-and-aft direction and is rotatably supported on opposed front and rear walls of either one of the upper and lower crankcases. An output shaft to be driven by a power of the counter shaft penetrates through the front and rear walls of one of the upper and lower crankcases by which the main shaft is not rotatably supported, and projects to the front and rear.
대표청구항▼
What is claimed is: 1. A crankcase structure of an internal combustion engine, comprising: a crankcase including upper and lower halves; a crankshaft and a counter shaft rotatably supported on a partitioning plane of the crankcase and oriented in the fore-and-aft direction; a main shaft oriented in
What is claimed is: 1. A crankcase structure of an internal combustion engine, comprising: a crankcase including upper and lower halves; a crankshaft and a counter shaft rotatably supported on a partitioning plane of the crankcase and oriented in the fore-and-aft direction; a main shaft oriented in the fore-and-aft direction and rotatably supported on opposed front and rear walls of one of the upper and lower halves of the crankcase; and an output shaft oriented in the fore-and-aft direction to be driven by power of the counter shaft, wherein the output shaft penetrates through the front and rear walls of the other of the upper and lower halves of the crankcase, which does not support the main shaft, and projects to the front and rear. 2. The crankcase structure of an internal combustion engine according to claim 1, further comprising: a bearing opening for rotatably supporting the counter shaft via a bearing, said bearing opening being formed on one side wall of the crankcase at a position in the proximity of an output member provided at an end of the counter shaft that projects outward from one of the opposed front and rear walls of the crankcase; a first bearing recess for rotatably supporting one end of the main shaft via a first bearing, said first bearing recess being formed on said one side wall of the crankcase adjacent to the bearing opening for rotatably supporting the counter shaft; and a second bearing recess for rotatably supporting the other end of the main shaft via a second bearing, said second bearing recess being formed on the other side wall of the crankcase, which opposes the one side wall of the crankcase, wherein said second bearing recess has a larger inner diameter than a transmission gear located at an outer most end of the other end of the main shaft. 3. The crankcase structure of an internal combustion engine according to claim 2, wherein the main shaft includes an inner cylinder and an outer cylinder rotatably fitted to a part of the inner cylinder, one end of the inner cylinder is rotatably supported by the first bearing recess on the one side wall via the first bearing, and the other end of the inner cylinder is rotatably supported together with the outer cylinder by the second bearing recess on the other side wall via the second bearing. 4. The crankcase structure of an internal combustion engine according to claim 3, wherein the main shaft is inserted into the second bearing recess on the other side wall of the crankcase, and the one end of the inner cylinder is rotatably supported by the first bearing recess on the one side wall via the first bearing, and the second bearing is fitted between the outer cylinder rotatably fitted to a predetermined position of the inner cylinder and the second bearing recess of the other side wall from the outside, so that the main shaft is assembled. 5. The crankcase structure of an internal combustion engine according to claim 3, wherein a pair of transmission clutches for controlling transmission of power to the outer cylinder and the inner cylinder, respectively, are assembled respectively to the outside portion of the outer cylinder that projects outward from the second bearing recess of the other side wall and the outside portion of the inner cylinder that projects further outward from the outer cylinder. 6. The crankcase structure of an internal combustion engine according to claim 4, wherein a pair of transmission clutches for controlling transmission of power to the outer cylinder and the inner cylinder, respectively, are assembled respectively to the outside portion of the outer cylinder that projects outward from the second bearing recess of the other side wall and the outside portion of the inner cylinder that projects further outward from the outer cylinder. 7. The crankcase structure of an internal combustion engine according to claim 1, further comprising: a first bearing recess for rotatably supporting one end of the main shaft via a first bearing, said first bearing recess being formed on one side wall of the crankcase; and a second bearing recess for rotatably supporting the other end of the main shaft via a second bearing, said second bearing recess being formed on the other side wall of the crankcase, which opposes the one side wall of the crankcase, wherein said second bearing recess has a larger inner diameter than a transmission gear located at an outer most end of the other end of the main shaft. 8. The crankcase structure of an internal combustion engine according to claim 7, wherein the main shaft includes an inner cylinder and an outer cylinder rotatably fitted to a part of the inner cylinder, one end of the inner cylinder is rotatably supported by the first bearing recess on the one side wall via the first bearing, and the other end of the inner cylinder is rotatably supported together with the outer cylinder by the second bearing recess on the other side wall via the second bearing. 9. The crankcase structure of an internal combustion engine according to claim 8, wherein the main shaft is inserted into the second bearing recess on the other side wall of the crankcase, and the one end of the inner cylinder is rotatably supported by the first bearing recess on the one side wall via the first bearing, and the second bearing is fitted between the outer cylinder rotatably fitted to a predetermined position of the inner cylinder and the second bearing recess of the other side wall from the outside, so that the main shaft is assembled. 10. The crankcase structure of an internal combustion engine according to claim 9, wherein a pair of transmission clutches for controlling transmission of power to the outer cylinder and the inner cylinder, respectively, are assembled respectively to the outside portion of the outer cylinder that projects outward from the second bearing recess of the other side wall and the outside portion of the inner cylinder that projects further outward from the outer cylinder. 11. A crankcase structure of an internal combustion engine, comprising: a crankcase including upper and lower halves; a main shaft rotatably supported on one of the upper and lower halves of the crankcase; and an output shaft, said output shaft penetrating the other of the upper and lower halves of the crankcase. 12. The crankcase structure of an internal combustion engine according to claim 11, further comprising: a bearing opening for rotatably supporting a counter shaft via a bearing, said bearing opening being formed on one side wall of the crankcase at a position in the proximity of an output member provided at an end of the counter shaft that projects outward from one of opposed front and rear walls of the crankcase; a first bearing recess for rotatably supporting one end of the main shaft via a first bearing, said first bearing recess being formed on said one side wall of the crankcase adjacent to the bearing opening for rotatably supporting the counter shaft; and a second bearing recess for rotatably supporting the other end of the main shaft via a second bearing, said second bearing recess being formed on the other side wall of the crankcase, wherein said second bearing recess has a larger inner diameter than a transmission gear located at an outer most end of the other end of the main shaft. 13. The crankcase structure of an internal combustion engine according to claim 12, wherein the main shaft includes an inner cylinder and an outer cylinder rotatably fitted to a part of the inner cylinder, one end of the inner cylinder is rotatably supported by the first bearing recess on the one side wall via the first bearing, and the other end of the inner cylinder is rotatably supported together with the outer cylinder by the second bearing recess on the other side wall via the second bearing. 14. The crankcase structure of an internal combustion engine according to claim 13, wherein the main shaft is inserted into the second bearing recess on the other side wall of the crankcase, and the one end of the inner cylinder is rotatably supported by the first bearing recess on the one side wall via the first bearing, and the second bearing is fitted between the outer cylinder rotatably fitted to a predetermined position of the inner cylinder and the second bearing recess of the other side wall from the outside, so that the main shaft is assembled. 15. The crankcase structure of an internal combustion engine according to claim 13, wherein a pair of transmission clutches for controlling transmission of power to the outer cylinder and the inner cylinder, respectively, are assembled respectively to the outside portion of the outer cylinder that projects outward from the second bearing recess of the other side wall and the outside portion of the inner cylinder that projects further outward from the outer cylinder. 16. The crankcase structure of an internal combustion engine according to claim 14, wherein a pair of transmission clutches for controlling transmission of power to the outer cylinder and the inner cylinder, respectively, are assembled respectively to the outside portion of the outer cylinder that projects outward from the second bearing recess of the other side wall and the outside portion of the inner cylinder that projects further outward from the outer cylinder. 17. The crankcase structure of an internal combustion engine according to claim 11, further comprising: a first bearing recess for rotatably supporting one end of the main shaft via a first bearing, said first bearing recess being formed on one side wall of the crankcase; and a second bearing recess for rotatably supporting the other end of the main shaft via a second bearing, said second bearing recess being formed on the other side wall of the crankcase, which opposes the one side wall of the crankcase, wherein said second bearing recess has a larger inner diameter than a transmission gear located at an outer most end of the other end of the main shaft. 18. The crankcase structure of an internal combustion engine according to claim 17, wherein the main shaft includes an inner cylinder and an outer cylinder rotatably fitted to a part of the inner cylinder, one end of the inner cylinder is rotatably supported by the first bearing recess on the one side wall via the first bearing, and the other end of the inner cylinder is rotatably supported together with the outer cylinder by the second bearing recess on the other side wall via the second bearing. 19. The crankcase structure of an internal combustion engine according to claim 18, wherein the main shaft is inserted into the second bearing recess on the other side wall of the crankcase, and the one end of the inner cylinder is rotatably supported by the first bearing recess on the one side wall via the first bearing, and the second bearing is fitted between the outer cylinder rotatably fitted to a predetermined position of the inner cylinder and the second bearing recess of the other side wall from the outside, so that the main shaft is assembled. 20. The crankcase structure of an internal combustion engine according to claim 19, wherein a pair of transmission clutches for controlling transmission of power to the outer cylinder and the inner cylinder, respectively, are assembled respectively to the outside portion of the outer cylinder that projects outward from the second bearing recess of the other side wall and the outside portion of the inner cylinder that projects further outward from the outer cylinder.
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이 특허에 인용된 특허 (1)
Isaka Yoshiharu (Shizuoka JPX), Internal combustion engine with combined transmission case and crankshaft case, and intermediate shaft.
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