WO2004001213A1 - スクータ用エンジン - Google Patents
スクータ用エンジン Download PDFInfo
- Publication number
- WO2004001213A1 WO2004001213A1 PCT/JP2003/007629 JP0307629W WO2004001213A1 WO 2004001213 A1 WO2004001213 A1 WO 2004001213A1 JP 0307629 W JP0307629 W JP 0307629W WO 2004001213 A1 WO2004001213 A1 WO 2004001213A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- valve
- cylinder
- engine
- intake
- lifter
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/14—Tappets; Push rods
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
- F01L1/053—Camshafts overhead type
- F01L2001/0537—Double overhead camshafts [DOHC]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2303/00—Manufacturing of components used in valve arrangements
- F01L2303/01—Tools for producing, mounting or adjusting, e.g. some part of the distribution
Definitions
- the present invention relates to an engine in a DOHC type straddle-type vehicle mounted such that the axis of a cylinder extends toward the front of the vehicle.
- a valve lifter having a bottomed cylindrical shape is attached to each of the tip of the intake valve and the tip of the exhaust valve, and the top surface of the valve lifter has an intake camshaft or exhaust valve.
- the cam of the camshaft is to engage with the cam.
- the pulp lid is slidably fitted in a guide hole of a cylinder head and is positioned on the same axis as the intake / exhaust valve.
- a thin shim is interposed between the inner bottom surface of the valve lifter and the intake / exhaust valve in order to adjust a gap (valve clearance) between the top surface and the base circle portion of the cam.
- the inventor adopted the above-mentioned DOHC type engine as a starter engine, I thought about improving the running performance of the cooter.
- the exhaust valve located particularly on the lower side and the pallet lifter mounted on the tip of the exhaust valve have their respective axial directions directed forward and downward. Will be extended. For this reason, if the camshaft is removed from the cylinder head in the above state, there is no longer any member for holding the pallet lifter for the exhaust valve, and the pallet lifter falls off the cylinder head by its own weight. Further, when the pallet lifter comes off the cylinder head in this way, the shim interposed between the pallet lifter and the exhaust valve also falls off. This shim is a small part compared to the balprift and is easily lost when dropped from the cylinder without the operator's notice. Disclosure of the invention
- the present invention has been made in view of the above circumstances, and has an object to prevent pulp rifters and shims from falling off during maintenance when mounting a DOHC type engine on a scooter.
- the stopper opposing the top surface of the valve lifter is provided as described above. It is provided on the cylinder.
- the DOHC type engine can be mounted on the starter while preventing the valve lifter from falling off during maintenance.
- a shim may be interposed between the intake / exhaust valve and the inner bottom surface of the valve lifter.
- FIG. 1 is a right side view of a unit swing type power unit for a scooter provided with an engine according to the present invention.
- FIG. 2 is a left side view of the engine cylinder.
- FIG. 3 is a front view of the cylinder head.
- FIG. 4 is a cross-sectional view taken along line VI-VI in FIG.
- FIGS. 5A and 5B are views showing the stopper.
- FIG. 5A is a plan view
- FIG. 5B is a front view
- FIG. 5C is a side view.
- reference numeral 1 denotes a unit swing type power unit equipped with an engine 2.
- the power unit 1 incorporates an engine 2 and a rear wheel 3 integrally.
- the power unit 1 swings up and down on a body frame (not shown) of a scooter 6 via a link (not shown) connected to a connection boss 5 at the upper end of a crankcase 4 of an engine 2. Supported.
- the following left and right are referred to the following left and right ,
- the engine 2 is of a water-cooled single-cylinder DOHC type, which refers to the width direction of the scooter 6 toward the front of the starter 6.
- the engine 2 includes a crankcase 4 and a cylinder 7 protruding from the crankcase 4.
- a transmission case 8 extending in the front-rear direction in the left region of the rear wheel 3 is provided.
- the rear wheel 3 is supported by the transmission case 8 and a rear arm 9 extending rearward in the right region of the rear wheel 3 from the crankcase 4.
- the rear end of the transmission case 8 and the rear end of the rear arm 9 are connected to the vehicle body frame via cushion units 10, respectively.
- the cylinder 7 includes a cylinder body 11 protruding forward and obliquely upward from the crankcase 4, and a cylinder head 1 attached to a front end of the cylinder pod 11. 2 and a head cover 14 attached to the front end of the cylinder head 12, and between the cylinder head 12 and the head cover 14 a valve operating cam chamber 13 (see FIG. 2) is formed.
- the cylinder 7 protrudes forward and obliquely upward from the crankcase 4, and therefore, the axis C of the cylinder 7 extends forward and obliquely upward.
- the axis C is slightly upwardly inclined so as to extend toward the vicinity of the upper edge of the front wheel 15.
- Two intake valves 16 and two exhaust valves 17 are detachably supported by the cylinder head 12, and a valve train that drives these intake valves 16 and exhaust valves 17. 18 and spark plugs (not shown) are supported.
- An intake device 19 is connected to the upper surface of the cylinder head 12 and an exhaust pipe 20 is connected to the lower surface.
- the axis C1 of the exhaust valve 17 is inclined so as to extend forward and downward as shown in FIGS. Said As shown in FIG. 1, the exhaust pipe 20 extends rearward from the cylinder head 12 so as to pass through the right area of the crankcase 4 and is connected to the muffler 21 at the right area of the lear arm 9. .
- a fuel tank is indicated by reference numeral 22 provided in front of the engine 2.
- a radiator indicated by reference numeral 23 disposed in front of the fuel tank 22 is a radiator.
- a storage box 24 is provided above the engine 2.
- the storage box 24 is formed so as to be able to store two helmets (not shown), and the upper access opening is opened and closed by a seat.
- Two helmet storage sections in the storage box 24 are indicated by reference numerals 24a and 24b.
- reference numeral 25 denotes a combustion chamber; 26, an intake port opened and closed by an intake valve 16; 27, an exhaust port opened and closed by an exhaust valve 17; 28, a piston; Indicates a connecting rod.
- the valve gear 18 of the engine 2 drives the two intake valves 16 and the two exhaust valves 17.
- the valve operating device 18 is housed in the valve operating cam chamber 13 and is arranged so as to be located above and below the cylinder axis C.
- the drive system of the intake valve 16 and the drive system of the exhaust valve 17 are configured to be line-symmetric with respect to the axis C of the cylinder 7.
- the intake camshaft 31 and the exhaust camshaft 32 have their respective axial lines extending in the width direction of the scooter 6, and the left and right bearings 35, 36 of the cylinder head 12 (see FIG. 3). Bearings 37, 38 of the right-hand rule and a cam cap (not shown) are attached so as to be rotatable around the axis and detachable. Also, the above intake camshaft 31 and The exhaust camshaft 32 has two cams 31a and 32a (see FIGS. 2 and 4), respectively. 3 shows the cylinder head 12 as viewed from the front of the starter 6, the right side of the figure is the left side. A ponolet hole into which a fixing port for fixing the cam cap to the cylinder head 12 is screwed is indicated by reference numeral 39 in FIGS.
- left and right cam storage spaces 40 are formed in the cylinder head 12 at positions corresponding to the intake and exhaust valves 16 and 17, respectively. Is provided between the left and right cam storage spaces 40.
- the right bearings 37 and 38 include a timing chain storage space 41 formed at the right end of the cylinder head 12 and a right and left force storage space 40 and 40. It is provided between the cam storage space 40 on the right side.
- a stopper 42 described below is provided below the bearing 36 for the exhaust shaft.
- the valve lifter 33 has a bottomed cylindrical shape as shown in FIG.
- the pallet lifter 33 is used for the pallet lifter of the cylinder head 12 in a state where the cams 31a and 32a of the intake and exhaust camshafts 31 and 32 are engaged with the top surface 33a.
- Guide hole 43 is slidably fitted.
- the guide holes 43 are formed on the same axis as the intake / exhaust valves 16 and 17 and are formed so that the tips of the intake / exhaust valves 16 and 17 are fitted inside.
- the cylinder head 12 is open to the force storage space 40.
- a shim 44 for adjusting pulp clearance is interposed between the inner bottom surface of the pulp lifter 33 and the valve shafts 16 & 17 a of the intake and exhaust valves 16 and 17. .
- the valve spring 34 includes a spring retainer 46 attached to shaft ends of intake and exhaust valves 16 and 17 via cotter pins 45. ? It is provided between the guide hole 43 and the springer sheet 47 provided at the bottom of the guide hole 43.
- the valve spring 34 biases the intake and exhaust valves 16 and 17 in the closing direction.
- the valve spring 34 extends vertically downward from the left bearing 36 for the exhaust cam shaft 32.
- the wall 51 extends, and the front end face 51 a of the vertical wall 51 constitutes the end of the cylinder head 12 on the side of the head cover 14.
- the stopper 42 includes a support plate 4 2 a detachably fixed to the front end surface 51 a of the vertical wall 51 by a fixing screw 52, and a width direction of the scooter 6 of the support plate 42 a. It has a stopper piece 42b, 42b integrally formed at both ends.
- the front end face 5 la is formed so as to be lower (positioned rearward) than the mating face 36 a (see FIG. 4) to which the cam cap of the bearing 36 is connected.
- the head of the fixing screw 52 for fixing the support plate 42a is configured to be lower than the mating surface 36a.
- each of the stopper pieces 42 extends rearward and upward in the cam storage space 40 in parallel with the vertical wall 51 and the side surface of the bearing 36. As shown in Figs. 2 and 4, each stopper piece 4 2b of the stopper 42 opposes the top surface 3 3a of each pulp rifter 33 for the exhaust valve located below the axis C of the cylinder 7. It is provided as follows. More specifically, as shown in FIG. 4, the base circle portion of the cam 32 a in the exhaust cam shaft 32 is engaged with the top surface 33 a of the exhaust valve palbur lifter 33. In the above, each stopper piece 42b is formed so as to be separated from the top surface 33a by a gap d and to face this top surface 33a.
- the right stopper piece 4 2b is opposed to the right exhaust valve valve pre-lifter 33, and the left stopper piece 4 2 is the left exhaust valve valve pre-lifter 3 3 Facing.
- the rotation of the shaft 31 and the exhaust camshaft 32 causes the camshaft 31, 3 2 to rotate.
- the valve lifter 33 and the intake and exhaust valves 16 and 17 are driven so as to follow the cams 31a and 32a.
- the work of replacing the intake and exhaust camshafts 31 and 32 during maintenance or the like is performed while the engine 2 is mounted on the starter 6.
- the exhaust valve lifter 33 tries to lower by its own weight along the guide hole 4 3.
- the stopper 3 comes into contact with the stopper 42 and stops, thereby preventing the stopper 3 from dropping off the cylinder 7.
- the shim 44 is interposed between the intake and exhaust valves 16 and 17 and the inner bottom surface of the valve lifter 33.
- the shim 44 is a small part as compared with the valve lifter 33, if the shim 44 is dropped together with the palbrifer 33, the shim 44 is easily lost. However, as described above, since the pallet lifter 33 is prevented from falling off by the stopper 42, the shim 44 is also prevented from falling off and prevented from being lost.
- the axis C of the cylinder 7 may extend forward and downward. Further, the stopper 42 may be provided for the valve lifter 33 for the intake valve 16.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004515496A JP3919017B2 (ja) | 2002-06-21 | 2003-06-16 | スクータ用エンジン |
EP03733453A EP1541848A4 (en) | 2002-06-21 | 2003-06-16 | ENGINE FOR ENGINE ROLLER |
AU2003241682A AU2003241682A1 (en) | 2002-06-21 | 2003-06-16 | Engine for scooter |
US10/510,318 US7066124B2 (en) | 2002-06-21 | 2003-06-16 | Engine for scooter |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-181341 | 2002-06-21 | ||
JP2002181341 | 2002-06-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004001213A1 true WO2004001213A1 (ja) | 2003-12-31 |
Family
ID=29996624
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/007629 WO2004001213A1 (ja) | 2002-06-21 | 2003-06-16 | スクータ用エンジン |
Country Status (6)
Country | Link |
---|---|
US (1) | US7066124B2 (ja) |
EP (1) | EP1541848A4 (ja) |
JP (1) | JP3919017B2 (ja) |
AU (1) | AU2003241682A1 (ja) |
TW (1) | TW579408B (ja) |
WO (1) | WO2004001213A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007146731A (ja) * | 2005-11-25 | 2007-06-14 | Yamaha Motor Co Ltd | エンジン及び車両 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005011224B4 (de) * | 2005-03-11 | 2013-05-29 | Audi Ag | Zylinderkopf |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6373502U (ja) * | 1986-10-31 | 1988-05-17 | ||
JP2000087711A (ja) * | 1998-09-14 | 2000-03-28 | Honda Motor Co Ltd | バルブ休止機構を有する内燃機関の弁装置 |
JP2001123833A (ja) * | 1999-10-26 | 2001-05-08 | Yamaha Motor Co Ltd | 強制空冷式筒内噴射エンジン |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61137812A (ja) | 1984-12-07 | 1986-06-25 | Ajinomoto Co Inc | パ−ル光沢を有する洗浄剤組成物 |
JPS62237016A (ja) | 1986-04-08 | 1987-10-17 | Nissan Motor Co Ltd | 内燃機関の動弁装置 |
JPS6373502A (ja) | 1986-09-16 | 1988-04-04 | Tokin Corp | 希土類磁石の製造方法 |
JP2815721B2 (ja) | 1991-03-20 | 1998-10-27 | 株式会社小糸製作所 | 自動車用ヘッドランプ |
US5678514A (en) * | 1996-04-02 | 1997-10-21 | Ford Global Technologies, Inc. | Valve lifter retainer for an internal combustion engine |
US5709180A (en) * | 1997-02-06 | 1998-01-20 | General Motors Corporation | Narrow cam two-step lifter |
-
2003
- 2003-06-03 TW TW092115095A patent/TW579408B/zh not_active IP Right Cessation
- 2003-06-16 US US10/510,318 patent/US7066124B2/en not_active Expired - Lifetime
- 2003-06-16 JP JP2004515496A patent/JP3919017B2/ja not_active Expired - Fee Related
- 2003-06-16 AU AU2003241682A patent/AU2003241682A1/en not_active Abandoned
- 2003-06-16 EP EP03733453A patent/EP1541848A4/en not_active Withdrawn
- 2003-06-16 WO PCT/JP2003/007629 patent/WO2004001213A1/ja active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6373502U (ja) * | 1986-10-31 | 1988-05-17 | ||
JP2000087711A (ja) * | 1998-09-14 | 2000-03-28 | Honda Motor Co Ltd | バルブ休止機構を有する内燃機関の弁装置 |
JP2001123833A (ja) * | 1999-10-26 | 2001-05-08 | Yamaha Motor Co Ltd | 強制空冷式筒内噴射エンジン |
Non-Patent Citations (1)
Title |
---|
See also references of EP1541848A4 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007146731A (ja) * | 2005-11-25 | 2007-06-14 | Yamaha Motor Co Ltd | エンジン及び車両 |
Also Published As
Publication number | Publication date |
---|---|
JPWO2004001213A1 (ja) | 2005-10-20 |
TW579408B (en) | 2004-03-11 |
TW200401075A (en) | 2004-01-16 |
AU2003241682A1 (en) | 2004-01-06 |
US7066124B2 (en) | 2006-06-27 |
US20050211213A1 (en) | 2005-09-29 |
EP1541848A4 (en) | 2009-06-17 |
JP3919017B2 (ja) | 2007-05-23 |
EP1541848A1 (en) | 2005-06-15 |
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