TWI605189B - Engine - Google Patents
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- TWI605189B TWI605189B TW105131392A TW105131392A TWI605189B TW I605189 B TWI605189 B TW I605189B TW 105131392 A TW105131392 A TW 105131392A TW 105131392 A TW105131392 A TW 105131392A TW I605189 B TWI605189 B TW I605189B
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- head
- side wall
- cam
- engine
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Classifications
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- 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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0036—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
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- 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
- F01L1/267—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 with means for varying the timing or the lift of the valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F7/00—Casings, e.g. crankcases or frames
- F02F7/006—Camshaft or pushrod housings
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- 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
- F01L2001/0535—Single overhead camshafts [SOHC]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F7/00—Casings, e.g. crankcases or frames
- F02F7/006—Camshaft or pushrod housings
- F02F2007/0063—Head bolts; Arrangements of cylinder head bolts
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Description
本發明係關於一種引擎。 The present invention relates to an engine.
先前,已知有將氣缸頭與頭蓋之結合面配置於與凸輪軸相同之高度之引擎(例如參照日本公開專利公報2009-52475號)。再者,此處之「高度」係指將於氣缸軸線方向上自氣缸頭朝向頭蓋之方向視作上方之情形時之高度。於此種引擎中,將由凸輪軸驅動之進氣用或排氣用閥門之軸端配置於較結合面更高之位置。 In the prior art, an engine in which the joint surface of the cylinder head and the head cover is disposed at the same height as the cam shaft is known (for example, refer to Japanese Laid-Open Patent Publication No. 2009-52475). In addition, the "height" herein refers to the height in the case where the cylinder axis direction is viewed from the cylinder head toward the head cover. In such an engine, the shaft end of the intake or exhaust valve driven by the camshaft is disposed at a position higher than the joint surface.
另一方面,為了便於保養,較佳為對閥門之軸端之可接近性(accessibility)良好。作為用以提高對閥門之軸端之可接近性之方法,考慮確保氣缸頭之側壁與閥門之間之間隙較大。但是,此情形時,有引擎大型化之問題。 On the other hand, for ease of maintenance, it is preferable that the accessibility to the axial end of the valve is good. As a method for improving the accessibility to the shaft end of the valve, it is considered to ensure a large gap between the side wall of the cylinder head and the valve. However, in this case, there is a problem of engine size.
對此,就上述之引擎而言,於已卸除頭蓋之狀態下,閥門之軸端位於較氣缸頭之端部更高之位置。因此,即便未確保氣缸頭之側壁與閥門之間之間隙較大,亦可提高對閥門之軸端之可接近性。因此,可使引擎小型化。 In this regard, in the case of the above-described engine, the shaft end of the valve is located higher than the end of the cylinder head in the state in which the head cover has been removed. Therefore, the accessibility to the axial end of the valve can be improved even if the gap between the side wall of the cylinder head and the valve is not ensured. Therefore, the engine can be miniaturized.
然而,若將結合面配置於與凸輪軸相同之高度,則將氣缸頭與曲柄軸箱緊固之緊固螺栓之頭部位於較結合面更高之位置。因製造上 之要求而於頭蓋之側面之內表面設有傾斜,故而若頭部位於較結合面更高之位置,則頭部可能會與頭蓋之側面干涉。 However, if the joint surface is disposed at the same height as the cam shaft, the head of the fastening bolt that fastens the cylinder head and the crank axle box is located higher than the joint surface. Due to manufacturing It is required that the inner surface of the side surface of the head cover is inclined, so that if the head is located at a higher position than the joint surface, the head may interfere with the side of the head cover.
為了避免緊固螺栓之頭部與頭蓋之側面之干涉,較佳為確保緊固螺栓與頭蓋之側面之間之距離較大。但是,此情形時,引擎會大型化。 In order to avoid interference between the head of the fastening bolt and the side of the head cover, it is preferable to ensure a large distance between the fastening bolt and the side of the head cover. However, in this case, the engine will be large.
本發明之課題在於使引擎小型化且提高對閥門之軸端之可接近性。 An object of the present invention is to reduce the size of the engine and improve the accessibility to the axial end of the valve.
本發明之一態樣之引擎包括曲柄軸(crank shaft)、曲柄軸箱、氣缸體、氣缸頭、閥門、凸輪軸、頭蓋、第1緊固螺栓、以及第2緊固螺栓。曲柄軸箱收容曲柄軸。氣缸體連接於曲柄軸箱。氣缸頭連接於氣缸體。閥門安裝於氣缸頭。凸輪軸支撐於氣缸頭。頭蓋包括與氣缸頭之端部對向地配置之端部,且安裝於氣缸頭。 An engine of an aspect of the present invention includes a crank shaft, a crankcase, a cylinder block, a cylinder head, a valve, a camshaft, a head cover, a first fastening bolt, and a second fastening bolt. The crankcase houses the crankshaft. The cylinder block is connected to the crankcase. The cylinder head is connected to the cylinder block. The valve is mounted to the cylinder head. The camshaft is supported on the cylinder head. The head cover includes an end portion that is disposed opposite the end of the cylinder head and is mounted to the cylinder head.
第1緊固螺栓係將氣缸頭、氣缸體及曲柄軸箱緊固。第1緊固螺栓包括固定於氣缸頭之第1頭部。第2緊固螺栓將氣缸頭、氣缸體及曲柄軸箱緊固。第2緊固螺栓包括固定於氣缸頭之第2頭部。包括氣缸頭之端部之第1假想平面與包括頭蓋之端部之第2假想平面係與凸輪軸重疊。 The first fastening bolt fastens the cylinder head, the cylinder block, and the crankcase. The first fastening bolt includes a first head fixed to the cylinder head. The second fastening bolt fastens the cylinder head, the cylinder block, and the crankcase. The second fastening bolt includes a second head fixed to the cylinder head. The first imaginary plane including the end portion of the cylinder head and the second imaginary plane including the end portion of the head cover overlap the cam shaft.
氣缸頭包括於凸輪軸之軸線方向對向地配置之第1氣缸側壁及第2氣缸側壁。頭蓋包括連接於第1氣缸側壁之第1外殼側壁、及連接於第2氣缸側壁之第2外殼側壁。第1外殼側壁之內表面係以如下方式傾斜,即:於氣缸體之氣缸軸線方向,朝自氣缸頭朝向頭蓋之方向(以下稱為「頭蓋側」),第1外殼側壁與第2外殼側壁之間變窄。 The cylinder head includes a first cylinder side wall and a second cylinder side wall that are disposed opposite to each other in the axial direction of the cam shaft. The head cover includes a first outer casing side wall connected to the first cylinder side wall and a second outer casing side wall connected to the second cylinder side wall. The inner surface of the first outer casing side wall is inclined in the cylinder axis direction of the cylinder block toward the head cover from the cylinder head (hereinafter referred to as "head cover side"), the first outer casing side wall and the second outer casing side wall. Narrowed between.
於凸輪軸之軸線方向,第1頭部配置於第1氣缸側壁與第2頭部之間。於凸輪軸之軸線方向,第2頭部配置於第2氣缸側壁與第1頭部之間。凸輪軸之軸線方向上之第1氣缸側壁與第1頭部之間的距離小於凸 輪軸之軸線方向上之第2氣缸側壁與第2頭部之間的距離。自包括曲柄軸之軸線且與氣缸軸線垂直之第3假想平面至氣缸軸線方向上之第1頭部之距離小於自第3假想平面至氣缸軸線方向上之第2頭部之距離。 The first head portion is disposed between the first cylinder side wall and the second head portion in the axial direction of the cam shaft. The second head portion is disposed between the second cylinder side wall and the first head portion in the axial direction of the cam shaft. The distance between the first cylinder side wall and the first head in the axial direction of the camshaft is less than convex The distance between the second cylinder side wall and the second head in the axial direction of the axle. The distance from the third imaginary plane including the axis of the crankshaft and perpendicular to the cylinder axis to the first head in the cylinder axis direction is smaller than the distance from the third imaginary plane to the second head in the cylinder axis direction.
於本態樣之引擎中,成為氣缸頭與頭蓋之結合面之氣缸頭之端部與頭蓋之端部係配置於與凸輪軸重疊之高度。因此,可提高對閥門之軸端之可接近性。 In the engine of this aspect, the end portion of the cylinder head which is the joint surface between the cylinder head and the head cover and the end portion of the head cover are disposed at a height overlapping with the cam shaft. Therefore, the accessibility to the shaft end of the valve can be improved.
又,第1頭部係配置於靠近第1氣缸側壁之位置,連接於第1氣缸側壁之第1外殼側壁之內表面隨著自第1外殼側壁之端部離開,而於凸輪軸之軸線方向上向朝向第1頭部之方向傾斜。因此,第1頭部之位置越位於頭蓋側,第1頭部與第1外殼側壁之內表面之間之距離越小。此情形時,為了於第1外殼側壁之內表面與第1頭部之間確保間隙,引擎大型化。但是,於本態樣之引擎中,自第3假想平面至氣缸軸線方向上之第1頭部之距離小於自第3假想平面至氣缸軸線方向上之第2頭部之距離。因此,第1頭部於氣缸軸線方向位於較第2頭部更靠氣缸體側。因此,可使引擎小型化。再者,氣缸體側係指於氣缸軸線方向自氣缸頭朝向氣缸體之方向。 Further, the first head portion is disposed at a position close to the first cylinder side wall, and the inner surface of the first outer casing side wall connected to the first cylinder side wall is separated from the end portion of the first outer casing side wall in the axial direction of the cam shaft The upper direction is inclined toward the first head. Therefore, the position of the first head portion is located on the side of the head cover, and the distance between the first head portion and the inner surface of the side wall of the first outer casing is smaller. In this case, in order to ensure a gap between the inner surface of the first outer casing side wall and the first head portion, the engine is enlarged. However, in the engine of the present aspect, the distance from the third imaginary plane to the first head in the cylinder axis direction is smaller than the distance from the third imaginary plane to the second head in the cylinder axis direction. Therefore, the first head portion is located closer to the cylinder block side than the second head portion in the cylinder axis direction. Therefore, the engine can be miniaturized. Further, the cylinder block side refers to the direction from the cylinder head toward the cylinder block in the cylinder axis direction.
進而,與第1頭部相對於第1氣缸側壁之位置相比,第2頭部係自第2氣缸側壁隔開配置。因此,即便第2頭部配置於較第1頭部更靠頭蓋側,亦可抑制引擎之大型化且確保第2外殼側壁與第2頭部之間之間隙。又,藉由將第2頭部配置於較第1頭部更靠頭蓋側,與將第2頭部配置於與第1頭部相同之高度之情形相比,可提高氣缸頭之剛性。根據以上所述,可使引擎小型化且可提高對閥門之軸端之可接近性。 Further, the second head portion is disposed apart from the second cylinder side wall than the position of the first head portion with respect to the first cylinder side wall. Therefore, even if the second head portion is disposed closer to the head cover than the first head portion, it is possible to suppress an increase in size of the engine and to secure a gap between the second casing side wall and the second head portion. Further, by arranging the second head portion closer to the head cover than the first head portion, the rigidity of the cylinder head can be improved as compared with the case where the second head portion is disposed at the same height as the first head portion. According to the above, the engine can be miniaturized and the accessibility to the shaft end of the valve can be improved.
較佳為,於自凸輪軸之軸線方向觀察時,第1緊固螺栓不與頭蓋重疊。此情形時,第1緊固螺栓被配置於較頭蓋之端部更靠氣缸體側。藉此,可使引擎小型化。 Preferably, the first fastening bolt does not overlap the head cover when viewed from the axial direction of the cam shaft. In this case, the first fastening bolt is disposed closer to the cylinder block side than the end portion of the head cover. Thereby, the engine can be miniaturized.
較佳為,引擎進而包括設置於凸輪軸之凸輪軸驅動部。於凸輪 軸之軸線方向,凸輪軸驅動部配置於第2氣缸側壁與第2頭部之間。藉此,使第2頭部與第2氣缸側壁隔開配置,故而與第1頭部和第1氣缸側壁之間之距離相比,可確保第2頭部與第2氣缸側壁之間之距離較大。藉此,即便確保引擎之剛性較大,亦可使引擎小型化。 Preferably, the engine further includes a camshaft drive portion disposed on the camshaft. Cam The camshaft drive unit is disposed between the second cylinder side wall and the second head portion in the axial direction of the shaft. Thereby, since the second head portion and the second cylinder side wall are disposed apart from each other, the distance between the second head portion and the second cylinder side wall can be ensured compared with the distance between the first head portion and the first cylinder side wall. Larger. Thereby, even if the rigidity of the engine is ensured to be large, the engine can be miniaturized.
較佳為,氣缸頭包括支撐凸輪軸之支撐壁。支撐壁包括供第2緊固螺栓配置之貫通孔。此情形時,第2緊固螺栓被配置於支撐壁之貫通孔中,故而可抑制支撐壁之大型化且可提高支撐壁之強度。藉此,可使引擎小型化。 Preferably, the cylinder head includes a support wall that supports the camshaft. The support wall includes a through hole for the second fastening bolt. In this case, since the second fastening bolt is disposed in the through hole of the support wall, it is possible to suppress an increase in the size of the support wall and to increase the strength of the support wall. Thereby, the engine can be miniaturized.
較佳為,引擎進而包括搖動軸(rocker shaft)、第1搖臂、第2搖臂、切換銷構件、及致動器。搖動軸支撐於氣缸頭,且與凸輪軸平行。第1搖臂支撐於搖動軸。第2搖臂支撐於搖動軸,且於凸輪軸之軸線方向與第1搖臂並排配置。切換銷構件可於凸輪軸之軸線方向移動,且設置為可移動至第1位置及第2位置。切換銷構件於第1位置將第1搖臂與第2搖臂連結,且與第1搖臂及第2搖臂一起擺動。切換銷構件於第2位置使第1搖臂與第2搖臂為非連結。致動器係將切換銷構件向凸輪軸之軸線方向推壓,而將切換銷構件之位置切換為第1位置及第2位置。致動器係於引擎之外部安裝於頭蓋。 Preferably, the engine further includes a rocker shaft, a first rocker arm, a second rocker arm, a switching pin member, and an actuator. The rocking shaft is supported by the cylinder head and is parallel to the camshaft. The first rocker arm is supported on the rocking shaft. The second rocker arm is supported by the rocking shaft and arranged in parallel with the first rocker arm in the axial direction of the camshaft. The switching pin member is movable in the axial direction of the cam shaft and is provided to be movable to the first position and the second position. The switching pin member connects the first rocker arm and the second rocker arm at the first position, and swings together with the first rocker arm and the second rocker arm. The switching pin member disconnects the first rocker arm from the second rocker arm at the second position. The actuator presses the switching pin member in the axial direction of the cam shaft, and switches the position of the switching pin member to the first position and the second position. The actuator is attached to the head cover outside the engine.
此情形時,於頭蓋安裝有致動器。因此,即便將致動器接近於切換銷構件而配置,與將致動器安裝於氣缸頭之情形相比,亦可抑制自氣缸頭內之燃燒室對致動器之熱影響。藉此,可抑制對致動器之熱影響且可使引擎小型化。 In this case, an actuator is attached to the head cover. Therefore, even if the actuator is disposed close to the switching pin member, the thermal influence of the combustion chamber from the combustion chamber in the cylinder head on the actuator can be suppressed as compared with the case where the actuator is attached to the cylinder head. Thereby, the thermal influence on the actuator can be suppressed and the engine can be miniaturized.
較佳為,於自氣缸軸線方向觀察時,致動器之至少一部分係與頭蓋之端部重疊。此情形時,致動器與切換銷構件之距離變短,藉此可減小切換銷構件所需之驅動力。藉此,可使致動器小型化,且可使引擎進一步小型化。 Preferably, at least a portion of the actuator overlaps the end of the head cover when viewed from the cylinder axis direction. In this case, the distance between the actuator and the switching pin member is shortened, whereby the driving force required to switch the pin member can be reduced. Thereby, the actuator can be miniaturized and the engine can be further miniaturized.
較佳為,於自氣缸軸線方向觀察時,第1緊固螺栓之至少一部分 係與致動器重疊。此情形時,可使引擎進一步小型化。 Preferably, at least a portion of the first fastening bolt is viewed from the direction of the cylinder axis It overlaps with the actuator. In this case, the engine can be further miniaturized.
根據本發明,可使引擎小型化,且可提高對閥門之軸端之可接近性。 According to the present invention, the engine can be miniaturized and the accessibility to the shaft end of the valve can be improved.
1‧‧‧引擎 1‧‧‧ engine
2‧‧‧曲柄軸 2‧‧‧ crankshaft
3‧‧‧曲柄軸箱 3‧‧‧ crankcase
4‧‧‧氣缸部 4‧‧‧Cylinder Department
5‧‧‧氣缸體 5‧‧‧Cylinder block
6‧‧‧氣缸頭 6‧‧‧ cylinder head
7‧‧‧頭蓋 7‧‧‧ head cover
8‧‧‧活塞 8‧‧‧Piston
9‧‧‧連桿 9‧‧‧ Connecting rod
11‧‧‧燃燒室 11‧‧‧ combustion chamber
12‧‧‧火星塞 12‧‧‧Mars plug
13‧‧‧閥動機構 13‧‧‧Valve mechanism
14‧‧‧凸輪軸 14‧‧‧Camshaft
15‧‧‧凸輪鏈條 15‧‧‧Cam chain
16‧‧‧凸輪鏈條室 16‧‧‧Cam chain room
17‧‧‧水泵 17‧‧‧Water pump
18‧‧‧冷卻液軟管 18‧‧‧ coolant hose
19‧‧‧散熱器 19‧‧‧ radiator
21‧‧‧墊片 21‧‧‧shims
22‧‧‧第1軸承 22‧‧‧1st bearing
23‧‧‧第2軸承 23‧‧‧2nd bearing
24‧‧‧排氣用閥門 24‧‧‧Exhaust valve
25‧‧‧排氣用閥門 25‧‧‧Exhaust valve
26‧‧‧進氣用閥門 26‧‧‧Intake valve
27‧‧‧進氣用閥門 27‧‧‧Intake valve
31‧‧‧排氣搖動軸 31‧‧‧Exhaust rocking shaft
32‧‧‧排氣搖臂 32‧‧‧Exhaust rocker arm
33‧‧‧進氣搖動軸 33‧‧‧Intake shaft
34‧‧‧進氣搖臂 34‧‧‧Intake rocker
35‧‧‧切換銷構件 35‧‧‧Switch pin member
36‧‧‧第1搖臂 36‧‧‧1st rocker
37‧‧‧第2搖臂 37‧‧‧2nd rocker
38‧‧‧施力構件 38‧‧‧ force components
39‧‧‧致動器 39‧‧‧Actuator
41‧‧‧第1支撐構件 41‧‧‧1st support member
42‧‧‧第2支撐構件 42‧‧‧2nd support member
44‧‧‧彈性構件 44‧‧‧Flexible components
51‧‧‧螺栓 51‧‧‧ bolt
52‧‧‧螺栓 52‧‧‧Bolts
61‧‧‧第1緊固螺栓 61‧‧‧1st fastening bolt
62‧‧‧第2緊固螺栓 62‧‧‧2nd fastening bolt
65‧‧‧第1頭部 65‧‧‧1st head
66‧‧‧第2頭部 66‧‧‧2nd head
67‧‧‧第3頭部 67‧‧‧3rd head
68‧‧‧第4頭部 68‧‧‧4th head
141‧‧‧第1凸輪軸端部 141‧‧‧1st camshaft end
142‧‧‧第2凸輪軸端部 142‧‧‧2nd camshaft end
143‧‧‧第1凸輪軸驅動部 143‧‧‧1st camshaft drive
144‧‧‧第1進氣用凸輪 144‧‧‧1st intake cam
145‧‧‧第2進氣用凸輪 145‧‧‧2nd intake cam
146‧‧‧排氣用凸輪 146‧‧‧Exhaust cam
201‧‧‧第2凸輪軸驅動部 201‧‧‧2nd camshaft drive unit
241‧‧‧排氣閥門彈簧 241‧‧‧Exhaust valve spring
242‧‧‧第1排氣閥門之柱端 242‧‧‧The end of the first exhaust valve
251‧‧‧排氣閥門彈簧 251‧‧‧Exhaust valve spring
252‧‧‧第2排氣閥門之柱端 252‧‧‧ the end of the second exhaust valve
261‧‧‧進氣閥門彈簧 261‧‧‧Intake valve spring
262‧‧‧第1進氣閥門之柱端 262‧‧‧The end of the first intake valve
271‧‧‧進氣閥門彈簧 271‧‧‧Intake valve spring
272‧‧‧第2進氣閥門之柱端 272‧‧‧ the end of the second intake valve
321‧‧‧臂本體 321‧‧‧arm body
322‧‧‧輥支撐部 322‧‧‧Roll support
323‧‧‧輥 323‧‧‧roll
324‧‧‧排氣閥門推壓部 324‧‧‧Exhaust valve pusher
325‧‧‧第1調節螺桿 325‧‧‧1st adjustment screw
326‧‧‧第2調節螺桿 326‧‧‧2nd adjustment screw
327‧‧‧貫通孔 327‧‧‧through holes
361‧‧‧第1臂本體 361‧‧‧1st arm body
362‧‧‧第1輥支撐部 362‧‧‧1st roller support
363‧‧‧第1輥 363‧‧‧1st roll
364‧‧‧進氣閥門推壓部 364‧‧‧Intake valve pusher
365‧‧‧第1連結部 365‧‧‧1st link
366‧‧‧貫通孔 366‧‧‧through holes
367‧‧‧第1調節螺桿 367‧‧‧1st adjustment screw
368‧‧‧第2調節螺桿 368‧‧‧2nd adjustment screw
369‧‧‧貫通孔 369‧‧‧through holes
371‧‧‧第2臂本體 371‧‧‧2nd arm body
372‧‧‧第2輥支撐部 372‧‧‧2nd roller support
373‧‧‧第2輥 373‧‧‧2nd roller
374‧‧‧第2連結部 374‧‧‧2nd link
375‧‧‧貫通孔 375‧‧‧through holes
376‧‧‧貫通孔 376‧‧‧through holes
391‧‧‧桿 391‧‧‧ rod
392‧‧‧本體部 392‧‧‧ Body Department
393‧‧‧凸緣部 393‧‧‧Flange
601‧‧‧第1端部 601‧‧‧1st end
602‧‧‧第2端部 602‧‧‧2nd end
603‧‧‧第1氣缸側壁 603‧‧‧1st cylinder side wall
604‧‧‧第2氣缸側壁 604‧‧‧2nd cylinder side wall
605‧‧‧第1突出壁部 605‧‧‧1st protruding wall
606‧‧‧第2突出壁部 606‧‧‧2nd protruding wall
607‧‧‧凹部 607‧‧‧ recess
608‧‧‧第3氣缸側壁 608‧‧‧3rd cylinder side wall
609‧‧‧第4氣缸側壁 609‧‧‧4th cylinder side wall
610‧‧‧進氣管之連接部 610‧‧‧Connecting pipe connection
611‧‧‧進氣管之連接部 611‧‧‧Connecting pipe connection
612‧‧‧第1支撐壁 612‧‧‧1st support wall
613‧‧‧第2支撐壁 613‧‧‧2nd support wall
614‧‧‧進氣埠 614‧‧‧Intake 埠
615‧‧‧排氣埠 615‧‧‧Exhaust gas
619‧‧‧段部 619‧‧‧ Section
620‧‧‧凹部 620‧‧‧ recess
621‧‧‧第1貫通孔 621‧‧‧1st through hole
622‧‧‧第2貫通孔 622‧‧‧2nd through hole
701‧‧‧頭蓋之端部 701‧‧‧ end of the head cover
702‧‧‧第1外殼側壁 702‧‧‧1st outer casing side wall
703‧‧‧第2外殼側壁 703‧‧‧2nd casing side wall
704‧‧‧貫通孔 704‧‧‧through holes
705‧‧‧第1凸座部 705‧‧‧1st seat
706‧‧‧第2凸座部 706‧‧‧2nd seat
Ax1‧‧‧氣缸軸線 Ax1‧‧‧Cylinder axis
Ax2‧‧‧曲柄軸線 Ax2‧‧‧ crank axis
Ax3‧‧‧凸輪軸線 Ax3‧‧‧ cam axis
D1‧‧‧距離 D1‧‧‧ distance
D2‧‧‧距離 D2‧‧‧ distance
P1‧‧‧第1假想平面 P1‧‧‧1st imaginary plane
P2‧‧‧第2假想平面 P2‧‧‧2nd imaginary plane
P3‧‧‧第3假想平面 P3‧‧‧3rd imaginary plane
圖1係引擎之一部分之剖面圖。 Figure 1 is a cross-sectional view of a portion of the engine.
圖2係自與氣缸軸線及凸輪軸線垂直之方向觀察氣缸頭及頭蓋而得之圖。 Figure 2 is a view of the cylinder head and the head cover viewed from a direction perpendicular to the cylinder axis and the cam axis.
圖3係自與氣缸軸線及凸輪軸線垂直之方向觀察氣缸頭及頭蓋而得之剖面圖。 Figure 3 is a cross-sectional view of the cylinder head and the head cover viewed from a direction perpendicular to the cylinder axis and the cam axis.
圖4係氣缸頭之內部之立體圖。 Figure 4 is a perspective view of the inside of the cylinder head.
圖5係氣缸頭之內部之立體圖。 Figure 5 is a perspective view of the interior of the cylinder head.
圖6係自氣缸軸線方向觀察氣缸頭之內部而得之圖。 Fig. 6 is a view showing the inside of the cylinder head viewed from the cylinder axis direction.
圖7係自凸輪軸線方向觀察氣缸頭之內部而得之剖面圖。 Fig. 7 is a cross-sectional view showing the inside of the cylinder head viewed from the direction of the cam axis.
圖8係第2支撐壁及施力構件附近之剖面圖。 Fig. 8 is a cross-sectional view showing the vicinity of the second support wall and the urging member.
圖9係自凸輪軸線方向觀察氣缸頭之內部而得之剖面圖。 Figure 9 is a cross-sectional view showing the inside of the cylinder head viewed from the direction of the cam axis.
圖10係自氣缸軸線方向觀察氣缸頭及頭蓋而得之圖。 Fig. 10 is a view showing the cylinder head and the head cover viewed from the cylinder axis direction.
圖11係自與凸輪軸線及氣缸軸線垂直之方向觀察到之引擎之一部分之剖面圖。 Figure 11 is a cross-sectional view of a portion of the engine as viewed from a direction perpendicular to the cam axis and the cylinder axis.
圖12係自與凸輪軸線及氣缸軸線垂直之方向觀察到之引擎之一部分之剖面圖。 Figure 12 is a cross-sectional view of a portion of the engine as viewed from a direction perpendicular to the cam axis and the cylinder axis.
以下,參照圖式對實施形態之引擎1進行說明。本實施形態之引擎1為水冷式之單氣缸引擎。圖1係引擎1之一部分之剖面圖。如圖1所示,引擎1包括曲柄軸2、曲柄軸箱3及氣缸部4。曲柄軸箱3收容曲柄軸2。氣缸部4包括氣缸體5、氣缸頭6及頭蓋7。氣缸體5連接於曲柄軸 箱3。氣缸體5可與曲柄軸箱3為一體,或亦可與曲柄軸箱3分開。氣缸體5收容活塞8。活塞8係經由連桿9而連結於曲柄軸2。 Hereinafter, the engine 1 of the embodiment will be described with reference to the drawings. The engine 1 of the present embodiment is a water-cooled single cylinder engine. Figure 1 is a cross-sectional view of a portion of the engine 1. As shown in FIG. 1, the engine 1 includes a crankshaft 2, a crankcase 3, and a cylinder portion 4. The crankcase 3 houses the crankshaft 2. The cylinder portion 4 includes a cylinder block 5, a cylinder head 6, and a head cover 7. Cylinder block 5 connected to crankshaft Box 3. The cylinder block 5 may be integral with the crankcase 3 or may be separate from the crankcase 3. The cylinder block 5 houses the piston 8. The piston 8 is coupled to the crankshaft 2 via a connecting rod 9.
再者,於本實施形態中,將於氣缸體5之氣缸軸線Ax1方向自氣缸頭6朝向頭蓋7之方向稱為「頭蓋側」。又,將於氣缸軸線Ax1方向自氣缸頭6朝向氣缸體5之方向稱為「氣缸體側」。 Further, in the present embodiment, the direction from the cylinder head 6 toward the head cover 7 in the cylinder axis Ax1 direction of the cylinder block 5 is referred to as "head cover side". Further, the direction from the cylinder head 6 toward the cylinder block 5 in the cylinder axis Ax1 direction is referred to as "cylinder block side".
氣缸頭6配置於氣缸體5之頭蓋側。氣缸頭6安裝於氣缸體5。頭蓋7配置於氣缸頭6之頭蓋側。頭蓋7安裝於氣缸頭6。氣缸軸線Ax1相對於曲柄軸2之中心軸線Ax2(以下稱為「曲柄軸線Ax2」)垂直。氣缸頭6包括燃燒室11。於氣缸頭6安裝有火星塞12。火星塞12之前端部係面向燃燒室11配置。火星塞12之基端部配置於引擎1之外部。於氣缸頭6及頭蓋7中收容有閥動機構(valve gear)13。 The cylinder head 6 is disposed on the head cover side of the cylinder block 5. The cylinder head 6 is mounted to the cylinder block 5. The head cover 7 is disposed on the head cover side of the cylinder head 6. The head cover 7 is mounted to the cylinder head 6. The cylinder axis Ax1 is perpendicular to the central axis Ax2 of the crankshaft 2 (hereinafter referred to as "crank axis Ax2"). The cylinder head 6 includes a combustion chamber 11. A spark plug 12 is mounted to the cylinder head 6. The front end of the spark plug 12 is disposed facing the combustion chamber 11. The base end of the Mars plug 12 is disposed outside of the engine 1. A valve gear 13 is housed in the cylinder head 6 and the head cover 7.
閥動機構13係用以開閉下述排氣用閥門24、25及進氣用閥門26、27之機構。對閥動機構13採用SOHC(Single OverHead Camshaft,單頂置式凸輪軸)式之機構。對閥動機構13係採用切換進氣用閥門26、27之開閉之時序之所謂可變閥動機構。閥動機構13包括凸輪軸14。凸輪軸14支撐於氣缸頭6。凸輪軸14之中心軸線Ax3(以下稱為「凸輪軸線Ax3」)相對於氣缸軸線Ax1垂直。凸輪軸線Ax3與曲柄軸線Ax2平行。 The valve mechanism 13 is a mechanism for opening and closing the following exhaust valves 24 and 25 and the intake valves 26 and 27. A mechanism of a SOHC (Single OverHead Camshaft) type is employed for the valve actuation mechanism 13. The valve mechanism 13 is a so-called variable valve mechanism that switches the timing of opening and closing of the intake valves 26 and 27. The valve actuation mechanism 13 includes a camshaft 14. The camshaft 14 is supported by the cylinder head 6. The central axis Ax3 of the camshaft 14 (hereinafter referred to as "cam axis Ax3") is perpendicular to the cylinder axis Ax1. The cam axis Ax3 is parallel to the crank axis Ax2.
凸輪軸14包括第1凸輪軸端部141及第2凸輪軸端部142。於第1凸輪軸端部141設置有第1凸輪軸驅動部143。第1凸輪軸驅動部143為鏈輪。第1凸輪軸驅動部143與凸輪鏈條15嚙合,凸輪鏈條15連結於凸輪軸14。於曲柄軸2設置有第2凸輪軸驅動部201。第2凸輪軸驅動部201為鏈輪。第2凸輪軸驅動部201與凸輪鏈條15嚙合,凸輪鏈條15連結於曲柄軸2。即,凸輪鏈條15捲繞於凸輪軸14之第1凸輪軸驅動部143及曲柄軸2之第2凸輪軸驅動部201。曲柄軸2之旋轉經由凸輪鏈條15而傳遞至凸輪軸14,藉此使凸輪軸14旋轉。 The camshaft 14 includes a first camshaft end 141 and a second camshaft end 142. The first camshaft drive unit 143 is provided at the first camshaft end portion 141. The first camshaft drive unit 143 is a sprocket. The first camshaft drive unit 143 meshes with the cam chain 15 , and the cam chain 15 is coupled to the camshaft 14 . The second camshaft drive unit 201 is provided on the crankshaft 2 . The second camshaft drive unit 201 is a sprocket. The second camshaft drive unit 201 meshes with the cam chain 15 , and the cam chain 15 is coupled to the crankshaft 2 . That is, the cam chain 15 is wound around the first camshaft drive unit 143 of the camshaft 14 and the second camshaft drive unit 201 of the crankshaft 2. The rotation of the crankshaft 2 is transmitted to the camshaft 14 via the cam chain 15, whereby the camshaft 14 is rotated.
於氣缸頭6及氣缸體5,設置有凸輪鏈條室16。凸輪鏈條15配置於凸輪鏈條室16。凸輪鏈條室16係相對於燃燒室11配置於與氣缸軸線Ax1垂直之方向。即,凸輪鏈條室16與燃燒室11於凸輪軸線Ax3方向並排配置。 A cam chain chamber 16 is provided in the cylinder head 6 and the cylinder block 5. The cam chain 15 is disposed in the cam chain chamber 16. The cam chain chamber 16 is disposed in a direction perpendicular to the cylinder axis Ax1 with respect to the combustion chamber 11. That is, the cam chain chamber 16 and the combustion chamber 11 are arranged side by side in the direction of the cam axis Ax3.
於第1凸輪軸端部141連結有水泵17。水泵17配置於凸輪軸14之凸輪軸線Ax3方向。水泵17係經由冷卻液軟管18而與引擎1內之未圖示之冷卻液通路及散熱器19連接。水泵17係由凸輪軸14之旋轉而驅動,藉此使引擎1之冷卻液循環。 A water pump 17 is coupled to the first camshaft end portion 141. The water pump 17 is disposed in the cam axis Ax3 direction of the cam shaft 14. The water pump 17 is connected to a coolant passage (not shown) and a radiator 19 in the engine 1 via a coolant hose 18. The water pump 17 is driven by the rotation of the cam shaft 14, whereby the coolant of the engine 1 is circulated.
圖2係自與氣缸軸線Ax1及凸輪軸線Ax3垂直之方向觀察氣缸頭6及頭蓋7而得之圖。圖3係自與氣缸軸線Ax1及凸輪軸線Ax3垂直之方向觀察氣缸頭6及頭蓋7而得之剖面圖。再者,於圖2及圖3中,自氣缸頭6及頭蓋7卸除水泵17。 2 is a view showing the cylinder head 6 and the head cover 7 viewed from a direction perpendicular to the cylinder axis Ax1 and the cam axis Ax3. 3 is a cross-sectional view showing the cylinder head 6 and the head cover 7 viewed from a direction perpendicular to the cylinder axis Ax1 and the cam axis Ax3. Further, in Figs. 2 and 3, the water pump 17 is removed from the cylinder head 6 and the head cover 7.
氣缸頭6包括第1端部601及第2端部602。第1端部601係於氣缸軸線Ax1方向與頭蓋7之端部701對向配置。第2端部602係於氣缸軸線Ax1方向與氣缸體5之端部對向配置。第1端部601與第2端部602係沿相對於氣缸軸線Ax1垂直之方向延伸。 The cylinder head 6 includes a first end portion 601 and a second end portion 602. The first end portion 601 is disposed to face the end portion 701 of the head cover 7 in the cylinder axis Ax1 direction. The second end portion 602 is disposed to face the end portion of the cylinder block 5 in the cylinder axis Ax1 direction. The first end portion 601 and the second end portion 602 extend in a direction perpendicular to the cylinder axis Ax1.
如圖3所示,包括氣缸頭6之第1端部601之第1假想平面P1與包括頭蓋7之端部701之第2假想平面P2係與凸輪軸14重疊。詳細而言,第1假想平面P1與第2假想平面P2位於較凸輪軸線Ax3更靠頭蓋側。再者,於氣缸頭6之第1端部601與頭蓋7之端部701之間夾持有墊片21。 As shown in FIG. 3, the first imaginary plane P1 including the first end portion 601 of the cylinder head 6 and the second imaginary plane P2 including the end portion 701 of the head cover 7 are overlapped with the cam shaft 14. Specifically, the first imaginary plane P1 and the second imaginary plane P2 are located closer to the head cover than the cam axis Ax3. Further, a spacer 21 is interposed between the first end portion 601 of the cylinder head 6 and the end portion 701 of the head cover 7.
氣缸頭6包括第1氣缸側壁603及第2氣缸側壁604。第1氣缸側壁603與第2氣缸側壁604係於凸輪軸線Ax3方向對向配置。第2氣缸側壁604較第1氣缸側壁603更靠近凸輪鏈條室16。第2氣缸側壁604較第1氣缸側壁603更靠近第1凸輪軸驅動部143。 The cylinder head 6 includes a first cylinder side wall 603 and a second cylinder side wall 604. The first cylinder side wall 603 and the second cylinder side wall 604 are arranged to face each other in the direction of the cam axis Ax3. The second cylinder side wall 604 is closer to the cam chain chamber 16 than the first cylinder side wall 603. The second cylinder side wall 604 is closer to the first cam shaft driving portion 143 than the first cylinder side wall 603.
頭蓋7包括第1外殼側壁702及第2外殼側壁703。第1外殼側壁702與第2外殼側壁703係於凸輪軸線Ax3方向對向配置。第1外殼側壁702 位於第1氣缸側壁603之頭蓋側,且連接於第1氣缸側壁603。第2外殼側壁703位於第2氣缸側壁604之頭蓋側,且連接於第2氣缸側壁604。第2外殼側壁703較第1外殼側壁702更靠近凸輪鏈條室16。第2外殼側壁703較第1外殼側壁702更靠近第1凸輪軸驅動部143。 The head cover 7 includes a first outer casing side wall 702 and a second outer casing side wall 703. The first outer casing side wall 702 and the second outer casing side wall 703 are disposed to face each other in the direction of the cam axis Ax3. First outer casing sidewall 702 It is located on the head cover side of the first cylinder side wall 603 and is connected to the first cylinder side wall 603. The second outer casing side wall 703 is located on the head cover side of the second cylinder side wall 604 and is connected to the second cylinder side wall 604. The second outer casing side wall 703 is closer to the cam chain chamber 16 than the first outer casing side wall 702. The second outer casing side wall 703 is closer to the first cam shaft driving portion 143 than the first outer casing side wall 702.
圖4及圖5係氣缸頭6之內部之立體圖。圖6係自氣缸軸線Ax1方向觀察氣缸頭6之內部而得之圖。如圖6所示,第1氣缸側壁603包括第1突出壁部605、第2突出壁部606及凹部607。第1突出壁部605與第2突出壁部606具有於凸輪軸線Ax3方向朝氣缸頭6之外方突出之形狀。凹部607位於第1突出壁部605與第2突出壁部606之間。凹部607具有於凸輪軸線Ax3方向朝氣缸頭6之內方凹陷之形狀。上述火星塞12係安裝於第1氣缸側壁603。火星塞12之基端部係配置於第1氣缸側壁603之凹部607。即,於自氣缸軸線Ax1方向觀察時,火星塞12之基端部配置於第1突出壁部605與第2突出壁部606之間。 4 and 5 are perspective views of the inside of the cylinder head 6. Fig. 6 is a view showing the inside of the cylinder head 6 as viewed from the cylinder axis Ax1 direction. As shown in FIG. 6, the first cylinder side wall 603 includes a first protruding wall portion 605, a second protruding wall portion 606, and a recessed portion 607. The first protruding wall portion 605 and the second protruding wall portion 606 have a shape that protrudes outward in the direction of the cam axis Ax3 toward the cylinder head 6 . The recessed portion 607 is located between the first protruding wall portion 605 and the second protruding wall portion 606. The recess 607 has a shape recessed toward the inside of the cylinder head 6 in the direction of the cam axis Ax3. The Mars plug 12 is attached to the first cylinder side wall 603. The base end portion of the Mars plug 12 is disposed in the recess 607 of the first cylinder side wall 603. That is, the base end portion of the spark plug 12 is disposed between the first protruding wall portion 605 and the second protruding wall portion 606 when viewed from the cylinder axis Ax1 direction.
氣缸頭6包括第3氣缸側壁608及第4氣缸側壁609。第3氣缸側壁608與第4氣缸側壁609係於與凸輪軸線Ax3及氣缸軸線Ax1垂直之方向並排配置。於第3氣缸側壁608,設置有排氣管(未圖示)之連接部610。如圖4所示,於第4氣缸側壁609,設置有進氣管(未圖示)之連接部611。 The cylinder head 6 includes a third cylinder sidewall 608 and a fourth cylinder sidewall 609. The third cylinder side wall 608 and the fourth cylinder side wall 609 are arranged side by side in a direction perpendicular to the cam axis Ax3 and the cylinder axis Ax1. A connection portion 610 of an exhaust pipe (not shown) is provided in the third cylinder side wall 608. As shown in FIG. 4, a connection portion 611 of an intake pipe (not shown) is provided in the fourth cylinder side wall 609.
氣缸頭6包括第1支撐壁612及第2支撐壁613。第1支撐壁612與第2支撐壁613係於凸輪軸線Ax3方向並排配置。第1支撐壁612與第2支撐壁613支撐凸輪軸14使之可旋轉。如圖3所示,第1支撐壁612係經由第1軸承22而支撐凸輪軸14。第2支撐壁613係經由第2軸承23而支撐凸輪軸14。第1支撐壁612與第2支撐壁613係配置於第1凸輪軸驅動部143與第1氣缸側壁603之間。第2支撐壁613較第1支撐壁612更靠近第1凸輪軸驅動部143。第2支撐壁613於凸輪軸線Ax3方向配置於第1支撐壁612與第1凸輪軸驅動部143之間。第1支撐壁612之脊部位於較氣缸頭6 之第1端部601更靠頭蓋側。第2支撐壁613之脊部位於較氣缸頭6之第1端部601更靠頭蓋側。 The cylinder head 6 includes a first support wall 612 and a second support wall 613. The first support wall 612 and the second support wall 613 are arranged side by side in the direction of the cam axis Ax3. The first support wall 612 and the second support wall 613 support the cam shaft 14 to be rotatable. As shown in FIG. 3, the first support wall 612 supports the cam shaft 14 via the first bearing 22. The second support wall 613 supports the cam shaft 14 via the second bearing 23 . The first support wall 612 and the second support wall 613 are disposed between the first camshaft drive unit 143 and the first cylinder side wall 603. The second support wall 613 is closer to the first camshaft drive unit 143 than the first support wall 612. The second support wall 613 is disposed between the first support wall 612 and the first camshaft drive unit 143 in the cam axis Ax3 direction. The ridge of the first support wall 612 is located on the cylinder head 6 The first end portion 601 is closer to the head cover side. The ridge portion of the second support wall 613 is located closer to the head cover than the first end portion 601 of the cylinder head 6.
圖7係自凸輪軸線Ax3方向觀察氣缸頭6之內部而得之剖面圖。如圖4~圖7所示,於氣缸頭6安裝有進氣用閥門26、27及排氣用閥門24、25。如圖7所示,氣缸頭6包括連通於燃燒室11之進氣埠614及排氣埠615。進氣用閥門26、27開閉進氣埠614。如圖6所示,進氣用閥門26、27包括第1進氣閥門26及第2進氣閥門27。第1進氣閥門26與第2進氣閥門27係於凸輪軸線Ax3方向並排配置。如圖7所示,於第1進氣閥門26安裝有進氣閥門彈簧261。進氣閥門彈簧261係朝第1進氣閥門26關閉進氣埠614之方向對第1進氣閥門26施力。關於第2進氣閥門27,亦同樣地安裝有進氣閥門彈簧271(參照圖4),且朝第2進氣閥門27關閉進氣埠614之方向對第2進氣閥門27施力。 Fig. 7 is a cross-sectional view showing the inside of the cylinder head 6 from the direction of the cam axis Ax3. As shown in FIGS. 4 to 7, the intake valves 26 and 27 and the exhaust valves 24 and 25 are attached to the cylinder head 6. As shown in FIG. 7, the cylinder head 6 includes an intake port 614 and an exhaust port 615 that communicate with the combustion chamber 11. The intake valves 26 and 27 open and close the intake port 614. As shown in FIG. 6, the intake valves 26 and 27 include a first intake valve 26 and a second intake valve 27. The first intake valve 26 and the second intake valve 27 are arranged side by side in the direction of the cam axis Ax3. As shown in FIG. 7, an intake valve spring 261 is attached to the first intake valve 26. The intake valve spring 261 biases the first intake valve 26 in a direction in which the first intake valve 26 closes the intake port 614. Similarly to the second intake valve 27, the intake valve spring 271 (see FIG. 4) is attached, and the second intake valve 27 is biased in the direction in which the second intake valve 27 closes the intake port 614.
排氣用閥門24、25開閉排氣埠615。如圖6所示,排氣用閥門24、25包括第1排氣閥門24及第2排氣閥門25。第1排氣閥門24與第2排氣閥門25係於凸輪軸線Ax3方向並排配置。如圖5及圖7所示,於第1排氣閥門24安裝有排氣閥門彈簧241。排氣閥門彈簧241係朝第1排氣閥門24關閉排氣埠615之方向對第1排氣閥門24施力。於第2排氣閥門25安裝有排氣閥門彈簧251,且朝第2排氣閥門25關閉排氣埠615之方向對第2排氣閥門25施力。 The exhaust valves 24 and 25 open and close the exhaust port 615. As shown in FIG. 6, the exhaust valves 24 and 25 include a first exhaust valve 24 and a second exhaust valve 25. The first exhaust valve 24 and the second exhaust valve 25 are arranged side by side in the direction of the cam axis Ax3. As shown in FIGS. 5 and 7, an exhaust valve spring 241 is attached to the first exhaust valve 24. The exhaust valve spring 241 biases the first exhaust valve 24 in a direction in which the first exhaust valve 24 closes the exhaust port 615. The exhaust valve spring 251 is attached to the second exhaust valve 25, and the second exhaust valve 25 is biased in a direction in which the second exhaust valve 25 closes the exhaust port 615.
如圖3所示,凸輪軸14包括第1進氣用凸輪144、第2進氣用凸輪145及排氣用凸輪146。第1進氣用凸輪144、第2進氣用凸輪145及排氣用凸輪146係於凸輪軸線Ax3方向並排配置。於第1進氣用凸輪144、第2進氣用凸輪145及排氣用凸輪146中,排氣用凸輪146最靠近第1凸輪軸驅動部143。於第1進氣用凸輪144、第2進氣用凸輪145及排氣用凸輪146中,第1進氣用凸輪144距離第1凸輪軸驅動部143最遠。第2進氣用凸輪145係於凸輪軸線Ax3方向配置於第1進氣用凸輪144與排氣 用凸輪146之間。 As shown in FIG. 3, the camshaft 14 includes a first intake cam 144, a second intake cam 145, and an exhaust cam 146. The first intake cam 144, the second intake cam 145, and the exhaust cam 146 are arranged side by side in the cam axis Ax3 direction. Among the first intake cam 144, the second intake cam 145, and the exhaust cam 146, the exhaust cam 146 is closest to the first camshaft drive unit 143. Among the first intake cam 144, the second intake cam 145, and the exhaust cam 146, the first intake cam 144 is the farthest from the first camshaft drive unit 143. The second intake cam 145 is disposed on the first intake cam 144 and the exhaust in the cam axis Ax3 direction. Use between cams 146.
如圖7所示,閥動機構13包括排氣搖動軸31及排氣搖臂32。排氣搖動軸31係與凸輪軸14平行地配置。排氣搖動軸31支撐於氣缸頭6。詳細而言,排氣搖動軸31係支撐於第1支撐壁612及第2支撐壁613。排氣搖動軸31之中心軸線位於較凸輪軸線Ax3更靠頭蓋側。 As shown in FIG. 7, the valve actuation mechanism 13 includes an exhaust rocker shaft 31 and an exhaust rocker arm 32. The exhaust rocking shaft 31 is disposed in parallel with the cam shaft 14. The exhaust rocking shaft 31 is supported by the cylinder head 6. Specifically, the exhaust rocker shaft 31 is supported by the first support wall 612 and the second support wall 613. The center axis of the exhaust rocker shaft 31 is located closer to the head cover than the cam axis Ax3.
排氣搖臂32係可以排氣搖動軸31為中心擺動地支撐於排氣搖動軸31。排氣搖臂32係設置為可使排氣用閥門24、25動作。排氣搖臂32包括臂本體321、輥支撐部322、輥323及排氣閥門推壓部324。 The exhaust rocker arm 32 is supported by the exhaust rocker shaft 31 so as to be swingable about the exhaust rocking shaft 31. The exhaust rocker arm 32 is provided to operate the exhaust valves 24 and 25. The exhaust rocker arm 32 includes an arm body 321, a roller support portion 322, a roller 323, and an exhaust valve pressing portion 324.
臂本體321包括貫通孔327,於該貫通孔327中貫通有排氣搖動軸31。輥支撐部322係自臂本體321向凸輪軸14側突出。輥支撐部322支撐輥323使之可旋轉。輥323之旋轉中心軸係與凸輪軸線Ax3平行。輥323位於排氣搖動軸31之凸輪軸14側。輥323與排氣用凸輪146接觸,且藉由排氣用凸輪146之旋轉而旋轉。 The arm body 321 includes a through hole 327 through which the exhaust rocking shaft 31 is inserted. The roller support portion 322 protrudes from the arm body 321 toward the cam shaft 14 side. The roller support portion 322 supports the roller 323 to be rotatable. The central axis of rotation of the roller 323 is parallel to the cam axis Ax3. The roller 323 is located on the cam shaft 14 side of the exhaust rocker shaft 31. The roller 323 is in contact with the exhaust cam 146 and is rotated by the rotation of the exhaust cam 146.
排氣閥門推壓部324係自臂本體321向與凸輪軸14為相反之側突出。即,排氣閥門推壓部324係自臂本體321向第1排氣閥門24之柱端(stem end)242側(以下稱為「排氣閥門側」)突出。如圖5及圖6所示,於排氣閥門推壓部324之前端,設置有第1調節螺桿(adjuster screw)325及第2調節螺桿326。第1調節螺桿325之前端與第1排氣閥門24之柱端242相對向。第2調節螺桿326之前端與第2排氣閥門25之柱端252相對向。 The exhaust valve pressing portion 324 protrudes from the arm body 321 toward the side opposite to the cam shaft 14. In other words, the exhaust valve pressing portion 324 protrudes from the arm main body 321 toward the stem end 242 side (hereinafter referred to as "exhaust valve side") of the first exhaust valve 24. As shown in FIGS. 5 and 6, a first adjusting screw 325 and a second adjusting screw 326 are provided at the front end of the exhaust valve pressing portion 324. The front end of the first adjusting screw 325 faces the column end 242 of the first exhaust valve 24. The front end of the second adjustment screw 326 is opposed to the column end 252 of the second exhaust valve 25.
若藉由排氣用凸輪146將輥323上推,則排氣搖臂32擺動,藉此排氣閥門推壓部324將第1排氣閥門24之柱端242及第2排氣閥門25之柱端252下壓。藉此,第1排氣閥門24及第2排氣閥門25經下壓而將排氣埠615打開。於輥323未由排氣用凸輪146上推時,藉由排氣閥門彈簧241、251將第1排氣閥門24及第2排氣閥門25上推而關閉排氣埠615。 When the roller 323 is pushed up by the exhaust cam 146, the exhaust rocker arm 32 swings, whereby the exhaust valve pressing portion 324 connects the column end 242 of the first exhaust valve 24 and the second exhaust valve 25 The column end 252 is pressed down. Thereby, the first exhaust valve 24 and the second exhaust valve 25 are pressed down to open the exhaust port 615. When the roller 323 is not pushed up by the exhaust cam 146, the first exhaust valve 24 and the second exhaust valve 25 are pushed up by the exhaust valve springs 241 and 251 to close the exhaust port 615.
如圖3所示,閥動機構13包括進氣搖動軸33、進氣搖臂34、切換 銷構件35及致動器39。進氣搖動軸33係與凸輪軸14平行地配置。進氣搖動軸33支撐於氣缸頭6。詳細而言,進氣搖動軸33支撐於第1支撐壁612及第2支撐壁613。進氣搖動軸33之中心軸線位於較凸輪軸線Ax3更靠頭蓋側。 As shown in FIG. 3, the valve mechanism 13 includes an intake rocking shaft 33, an intake rocker arm 34, and switching. Pin member 35 and actuator 39. The intake rocking shaft 33 is disposed in parallel with the cam shaft 14. The intake rocking shaft 33 is supported by the cylinder head 6. Specifically, the intake rocking shaft 33 is supported by the first support wall 612 and the second support wall 613. The center axis of the intake rocking shaft 33 is located closer to the head cover than the cam axis Ax3.
進氣搖臂34包括第1搖臂36及第2搖臂37。第1搖臂36係可以進氣搖動軸33為中心擺動地支撐於進氣搖動軸33。第1搖臂36係設置為可使進氣用閥門26、27動作。第1搖臂36包括圖3所示之第1臂本體361、圖6所示之第1輥支撐部362、第1輥363、進氣閥門推壓部364、及第1連結部365。 The intake rocker arm 34 includes a first rocker arm 36 and a second rocker arm 37. The first rocker arm 36 is supported by the intake rocking shaft 33 so as to be swingable about the intake rocking shaft 33. The first rocker arm 36 is provided to operate the intake valves 26 and 27. The first rocker arm 36 includes a first arm body 361 shown in FIG. 3, a first roller support portion 362 shown in FIG. 6, a first roller 363, an intake valve pressing portion 364, and a first connecting portion 365.
如圖3所示,第1臂本體361包括貫通孔366,於該貫通孔366中貫通有進氣搖動軸33。第1輥支撐部362係自第1臂本體361向凸輪軸14側突出。第1輥支撐部362支撐第1輥363使之可旋轉。第1輥363之旋轉中心軸係與凸輪軸線Ax3平行。第1輥363位於進氣搖動軸33之凸輪軸14側。第1輥363係與第1進氣用凸輪144接觸,藉由第1進氣用凸輪144之旋轉而旋轉。 As shown in FIG. 3, the first arm body 361 includes a through hole 366 through which the intake rocking shaft 33 passes. The first roller support portion 362 protrudes from the first arm body 361 toward the cam shaft 14 side. The first roller support portion 362 supports the first roller 363 so as to be rotatable. The central axis of rotation of the first roller 363 is parallel to the cam axis Ax3. The first roller 363 is located on the cam shaft 14 side of the intake rocking shaft 33. The first roller 363 is in contact with the first intake cam 144 and is rotated by the rotation of the first intake cam 144.
進氣閥門推壓部364係自第1臂本體361向與凸輪軸14為相反之側突出。即,進氣閥門推壓部364係自第1臂本體361向第1進氣閥門26之柱端262側(以下稱為「進氣閥門側」)突出。如圖6所示,於進氣閥門推壓部364之前端,設置有第1調節螺桿367及第2調節螺桿368。第1調節螺桿367之前端與第1進氣閥門26之柱端262相對向。第2調節螺桿368之前端與第2進氣閥門27之柱端272相對向。 The intake valve pressing portion 364 protrudes from the first arm body 361 to the side opposite to the cam shaft 14. In other words, the intake valve pressing portion 364 protrudes from the first arm body 361 toward the column end 262 side of the first intake valve 26 (hereinafter referred to as "intake valve side"). As shown in FIG. 6, the first adjustment screw 367 and the second adjustment screw 368 are provided at the front end of the intake valve pressing portion 364. The front end of the first adjustment screw 367 is opposed to the column end 262 of the first intake valve 26. The front end of the second adjustment screw 368 is opposed to the column end 272 of the second intake valve 27.
第1連結部365連接於進氣閥門推壓部364。第1連結部365位於較進氣搖動軸33更靠頭蓋側。第1連結部365位於較進氣搖動軸33更靠進氣閥門側。第1連結部365位於較進氣閥門推壓部364更靠頭蓋側。如圖3所示,第1連結部365包括貫通孔369。貫通孔369係沿凸輪軸線Ax3方向延伸。於貫通孔369中***有切換銷構件35。 The first connecting portion 365 is connected to the intake valve pressing portion 364. The first joint portion 365 is located closer to the head cover than the intake rocking shaft 33. The first joint portion 365 is located closer to the intake valve side than the intake rocking shaft 33. The first joint portion 365 is located closer to the head cover than the intake valve pressing portion 364. As shown in FIG. 3, the first connecting portion 365 includes a through hole 369. The through hole 369 extends in the direction of the cam axis Ax3. A switching pin member 35 is inserted into the through hole 369.
如圖7所示,第2搖臂37可以進氣搖動軸33為中心擺動地被支撐。第2搖臂37係於凸輪軸線Ax3方向與第1搖臂36並排配置。第2搖臂37係配置於第1搖臂36之凸輪鏈條室16側。即,第2搖臂37較第1搖臂36更靠近第1凸輪軸驅動部143。第2搖臂37包括第2臂本體371、第2輥支撐部372、第2輥373及第2連結部374。 As shown in FIG. 7, the second rocker arm 37 is supported to be swingable about the intake rocking shaft 33. The second rocker arm 37 is arranged side by side with the first rocker arm 36 in the direction of the cam axis Ax3. The second rocker arm 37 is disposed on the cam chain chamber 16 side of the first rocker arm 36. In other words, the second rocker arm 37 is closer to the first camshaft drive unit 143 than the first rocker arm 36. The second rocker arm 37 includes a second arm body 371 , a second roller support portion 372 , a second roller 373 , and a second coupling portion 374 .
第2臂本體371包括貫通孔375,於該貫通孔375中貫通有進氣搖動軸33。第2輥支撐部372係自第2臂本體371向凸輪軸14側突出。第2輥支撐部372支撐第2輥373使之可旋轉。第2輥373之旋轉中心軸係與凸輪軸線Ax3平行。第2輥373位於進氣搖動軸33之凸輪軸14側。第2輥373係與第2進氣用凸輪145接觸,且藉由第2進氣用凸輪145之旋轉而旋轉。 The second arm body 371 includes a through hole 375 through which the intake rocking shaft 33 passes. The second roller support portion 372 protrudes from the second arm body 371 toward the cam shaft 14 side. The second roller support portion 372 supports the second roller 373 to be rotatable. The central axis of rotation of the second roller 373 is parallel to the cam axis Ax3. The second roller 373 is located on the camshaft 14 side of the intake rocking shaft 33. The second roller 373 is in contact with the second intake cam 145 and is rotated by the rotation of the second intake cam 145.
第2連結部374係自第2臂本體371向與凸輪軸14為相反之側突出。即,第2連結部374係自第2臂本體371向進氣閥門側突出。第2連結部374位於較進氣搖動軸33更靠頭蓋側。第2連結部374位於較進氣閥門推壓部364更靠頭蓋側。如圖3所示,第2連結部374包括貫通孔376。貫通孔376係沿凸輪軸線Ax3方向延伸。第2連結部374之貫通孔376與第1連結部365之貫通孔369於凸輪軸線Ax3方向並排配置。因此,可於第2連結部374之貫通孔376中***切換銷構件35。 The second coupling portion 374 protrudes from the second arm body 371 on the side opposite to the cam shaft 14 . In other words, the second connecting portion 374 protrudes from the second arm body 371 toward the intake valve side. The second joint portion 374 is located closer to the head cover than the intake rocking shaft 33. The second joint portion 374 is located closer to the head cover than the intake valve pressing portion 364. As shown in FIG. 3, the second joint portion 374 includes a through hole 376. The through hole 376 extends in the direction of the cam axis Ax3. The through hole 376 of the second connecting portion 374 and the through hole 369 of the first connecting portion 365 are arranged side by side in the direction of the cam axis Ax3. Therefore, the switching pin member 35 can be inserted into the through hole 376 of the second coupling portion 374.
閥動機構13包括圖6所示之施力構件38。施力構件38係朝將第2輥373壓抵於凸輪軸14之方向對第2搖臂37施力。於本實施形態中,施力構件38為盤簧,使進氣搖動軸33通過施力構件38。第2搖臂37包括第1支撐構件41。第1支撐構件41支撐施力構件38之一端。第1支撐構件41具有銷狀之形狀,且自第2搖臂37向凸輪軸線Ax3方向突出。圖8為第2支撐壁613及施力構件38附近之剖面圖。 The valve actuation mechanism 13 includes a force applying member 38 as shown in FIG. The urging member 38 biases the second rocker arm 37 in a direction in which the second roller 373 is pressed against the cam shaft 14. In the present embodiment, the urging member 38 is a coil spring, and the intake rocking shaft 33 passes through the urging member 38. The second rocker arm 37 includes a first support member 41. The first support member 41 supports one end of the urging member 38. The first support member 41 has a pin shape and protrudes from the second rocker arm 37 in the cam axis Ax3 direction. FIG. 8 is a cross-sectional view of the vicinity of the second support wall 613 and the urging member 38.
如圖8所示,閥動機構13包括第2支撐構件42。第2支撐構件42支撐施力構件38之另一端。第2支撐構件42由彎曲之板材構成,且具有L 字狀之剖面形狀。於第2支撐壁613設置有段部619,第2支撐構件42支撐於段部619。 As shown in FIG. 8, the valve mechanism 13 includes a second support member 42. The second support member 42 supports the other end of the urging member 38. The second support member 42 is composed of a curved plate and has L The cross-sectional shape of the shape. A segment portion 619 is provided in the second support wall 613, and the second support member 42 is supported by the segment portion 619.
如圖3所示,切換銷構件35可於凸輪軸14之軸線方向移動,且設置為可移動至第1位置及第2位置。切換銷構件35於第1位置遍及第1連結部365之貫通孔369及第2連結部374之貫通孔376而配置。藉此,切換銷構件35將第1搖臂36與第2搖臂37連結,使第1搖臂36與第2搖臂37一體地擺動。於該狀態下,切換銷構件35與第1搖臂36及第2搖臂37一起擺動。 As shown in FIG. 3, the switching pin member 35 is movable in the axial direction of the cam shaft 14, and is provided to be movable to the first position and the second position. The switching pin member 35 is disposed at the first position through the through hole 369 of the first connecting portion 365 and the through hole 376 of the second connecting portion 374. Thereby, the switching pin member 35 connects the first rocker arm 36 and the second rocker arm 37, and the first rocker arm 36 and the second rocker arm 37 are integrally swung. In this state, the switching pin member 35 swings together with the first rocker arm 36 and the second rocker arm 37.
切換銷構件35於第2位置配置於第1連結部365之貫通孔369中,且不配置於第2連結部374之貫通孔376中。藉此,切換銷構件35係於第2位置使第1搖臂36與第2搖臂37為非連結,第1搖臂36與第2搖臂37相互獨立地擺動。於該狀態下,切換銷構件35與第1搖臂36一起擺動。 The switching pin member 35 is disposed in the through hole 369 of the first connecting portion 365 at the second position, and is not disposed in the through hole 376 of the second connecting portion 374. Thereby, the switching pin member 35 is in the second position, and the first rocker arm 36 and the second rocker arm 37 are disconnected, and the first rocker arm 36 and the second rocker arm 37 are independently swung. In this state, the switching pin member 35 swings together with the first rocker arm 36.
於第1連結部365設置有彈性構件44。彈性構件44係配置於第1連結部365之貫通孔369內。彈性構件44係朝自第1位置朝向第2位置之方向對切換銷構件35施力。因此,於切換銷構件35未受到致動器39推壓時,切換銷構件35係藉由彈性構件44而被保持於第2位置。若切換銷構件35受到致動器39推壓,則切換銷構件35對抗彈性構件44之施壓力而自第2位置移動至第1位置。 The elastic member 44 is provided in the first joint portion 365. The elastic member 44 is disposed in the through hole 369 of the first connecting portion 365 . The elastic member 44 urges the switching pin member 35 in a direction from the first position toward the second position. Therefore, when the switching pin member 35 is not pressed by the actuator 39, the switching pin member 35 is held at the second position by the elastic member 44. When the switching pin member 35 is pressed by the actuator 39, the switching pin member 35 moves from the second position to the first position against the pressing force of the elastic member 44.
如圖7所示,切換銷構件35位於較氣缸頭6之第1端部601及頭蓋7之端部701更靠頭蓋側。因此,於自凸輪軸14之軸線方向觀察時,切換銷構件35與頭蓋7重疊。如圖7所示,切換銷構件35位於進氣搖動軸33之進氣閥門側。即,於與氣缸軸線Ax1及凸輪軸14之軸線垂直之方向,切換銷構件35位於進氣搖動軸33與第1進氣閥門26之柱端262之間。於自凸輪軸14之軸線方向觀察時,進氣搖動軸33之軸心與切換銷構件35之軸心之間之距離小於進氣搖動軸33之軸心與第1進氣閥門26 之柱端262之間之距離。又,於與氣缸軸線Ax1及凸輪軸14之軸線垂直之方向,進氣搖動軸33位於切換銷構件35與第1輥363之間。同樣地,於與氣缸軸線Ax1及凸輪軸14之軸線垂直之方向,進氣搖動軸33位於切換銷構件35與第2輥372之間。 As shown in FIG. 7, the switching pin member 35 is located closer to the head cover than the first end portion 601 of the cylinder head 6 and the end portion 701 of the head cover 7. Therefore, the switching pin member 35 overlaps the head cover 7 when viewed from the axial direction of the cam shaft 14. As shown in FIG. 7, the switching pin member 35 is located on the intake valve side of the intake rocking shaft 33. That is, the switching pin member 35 is located between the intake rocking shaft 33 and the column end 262 of the first intake valve 26 in a direction perpendicular to the axis of the cylinder axis Ax1 and the cam shaft 14. When viewed from the axial direction of the camshaft 14, the distance between the axis of the intake rocking shaft 33 and the axis of the switching pin member 35 is smaller than the axis of the intake rocking shaft 33 and the first intake valve 26 The distance between the ends 262 of the column. Further, the intake rocking shaft 33 is located between the switching pin member 35 and the first roller 363 in a direction perpendicular to the axis of the cylinder axis Ax1 and the camshaft 14. Similarly, the intake rocking shaft 33 is located between the switching pin member 35 and the second roller 372 in a direction perpendicular to the axis of the cylinder axis Ax1 and the cam shaft 14.
圖9係以虛線表示第1搖臂36與第2搖臂37擺動之狀態。於切換銷構件35位於第1位置時,第1搖臂36與第2搖臂37連結,且與第2搖臂37一體地擺動。因此,當第2輥373由第2進氣用凸輪145上推時,第2搖臂37以進氣搖動軸33為中心擺動,藉此,第1搖臂36亦向使進氣閥門推壓部364下降之方向擺動。藉此,第1調節螺桿367之前端將第1進氣閥門26之柱端262下壓,並且第2調節螺桿368之前端將第2進氣閥門27之柱端272下壓。藉此,第1進氣閥門26與第2進氣閥門27將進氣埠614打開。於第2輥373未被第2進氣用凸輪145上推時,藉由進氣閥門彈簧261、271將第1進氣閥門26及第2進氣閥門27上推而關閉進氣埠614。 Fig. 9 shows a state in which the first rocker arm 36 and the second rocker arm 37 are swung by a broken line. When the switching pin member 35 is at the first position, the first rocker arm 36 is coupled to the second rocker arm 37 and swings integrally with the second rocker arm 37. Therefore, when the second roller 373 is pushed up by the second intake cam 145, the second rocker arm 37 swings around the intake rocking shaft 33, whereby the first rocker arm 36 also urges the intake valve. The portion 364 swings in the direction of the drop. Thereby, the front end of the first adjusting screw 367 presses the column end 262 of the first intake valve 26, and the front end of the second adjusting screw 368 presses the column end 272 of the second intake valve 27. Thereby, the first intake valve 26 and the second intake valve 27 open the intake port 614. When the second roller 373 is not pushed up by the second intake cam 145, the first intake valve 26 and the second intake valve 27 are pushed up by the intake valve springs 261 and 271 to close the intake port 614.
於切換銷構件35位於第2位置時,第1搖臂36與第2搖臂37獨立地擺動。因此,當第1輥363由第1進氣用凸輪144上推時,第1搖臂36以進氣搖動軸33為中心向使進氣閥門推壓部364下降之方向擺動。藉此,第1調節螺桿367之前端將第1進氣閥門26之柱端262壓下,並且第2調節螺桿368之前端將第2進氣閥門27之柱端272壓下。藉此,第1進氣閥門26與第2進氣閥門27將進氣埠614打開。於第1輥363未由第1進氣用凸輪144上推時,藉由進氣閥門彈簧261、271將第1進氣閥門26及第2進氣閥門27上推而關閉進氣埠614。 When the switching pin member 35 is at the second position, the first rocker arm 36 and the second rocker arm 37 swing independently. Therefore, when the first roller 363 is pushed up by the first intake cam 144, the first rocker arm 36 swings in the direction in which the intake valve pressing portion 364 is lowered around the intake rocking shaft 33. Thereby, the front end of the first adjusting screw 367 presses the column end 262 of the first intake valve 26, and the front end of the second adjusting screw 368 presses the column end 272 of the second intake valve 27. Thereby, the first intake valve 26 and the second intake valve 27 open the intake port 614. When the first roller 363 is not pushed up by the first intake cam 144, the first intake valve 26 and the second intake valve 27 are pushed up by the intake valve springs 261 and 271 to close the intake port 614.
再者,第1進氣用凸輪144與第2進氣用凸輪145之形狀係以如下方式設定:於第1進氣用凸輪144之前端到達第1輥363之前,第2進氣用凸輪145將第2輥373上推。因此,於切換銷構件35位於第1位置時,第1搖臂36藉由第2進氣用凸輪145之旋轉而動作,藉此第1進氣用凸輪144之旋轉無法傳遞至第1搖臂36。因此,於切換銷構件35位於第1位 置時,第1進氣閥門26及第2進氣閥門27相應於第2進氣用凸輪145之旋轉而進行開閉動作。另一方面,於切換銷構件35位於第2位置時,第2進氣用凸輪145之旋轉無法傳遞至第1搖臂36。因此,於切換銷構件35位於第2位置時,第1進氣閥門26及第2進氣閥門27相應於第1進氣用凸輪144之旋轉而進行開閉動作。 In addition, the shape of the first intake cam 144 and the second intake cam 145 is set such that the second intake cam 145 is before the first end of the first intake cam 144 reaches the first roller 363. The second roller 373 is pushed up. Therefore, when the switching pin member 35 is at the first position, the first rocker arm 36 is operated by the rotation of the second intake cam 145, whereby the rotation of the first intake cam 144 cannot be transmitted to the first rocker arm. 36. Therefore, the switching pin member 35 is located at the first place. At the time of the setting, the first intake valve 26 and the second intake valve 27 are opened and closed in response to the rotation of the second intake cam 145. On the other hand, when the switching pin member 35 is at the second position, the rotation of the second intake cam 145 cannot be transmitted to the first rocker arm 36. Therefore, when the switching pin member 35 is at the second position, the first intake valve 26 and the second intake valve 27 are opened and closed in accordance with the rotation of the first intake cam 144.
致動器39為電磁螺線管,藉由被通電而將切換銷構件35沿凸輪軸14之軸線方向推壓,將切換銷構件35之位置自第2位置切換為第1位置。若停止對致動器39通電,則藉由彈性構件44之彈性力而使切換銷構件35之位置自第1位置返回至第2位置。 The actuator 39 is an electromagnetic solenoid, and the switching pin member 35 is pressed in the axial direction of the cam shaft 14 by being energized, and the position of the switching pin member 35 is switched from the second position to the first position. When the energization of the actuator 39 is stopped, the position of the switching pin member 35 is returned from the first position to the second position by the elastic force of the elastic member 44.
如圖6所示,於自氣缸軸線Ax1方向觀察時,致動器39與氣缸頭6之第1端部601重疊。即,致動器39之一部分位於較氣缸頭6之第1端部601更靠氣缸頭6之內側。於自氣缸軸線Ax1方向觀察時,致動器39配置於相對於凸輪軸14與凸輪鏈條室16為相反之側。於自氣缸軸線Ax1方向觀察時,凸輪軸線Ax3之延長線位於排氣管之連接部610與致動器39之間。如圖3所示,致動器39位於較氣缸頭6之第1端部601更靠頭蓋側。 As shown in FIG. 6, the actuator 39 overlaps the first end portion 601 of the cylinder head 6 when viewed in the cylinder axis Ax1 direction. That is, one portion of the actuator 39 is located closer to the inner side of the cylinder head 6 than the first end portion 601 of the cylinder head 6. The actuator 39 is disposed on the side opposite to the cam chain chamber 16 with respect to the cam shaft 14 when viewed from the cylinder axis Ax1 direction. The extension line of the cam axis Ax3 is located between the connection portion 610 of the exhaust pipe and the actuator 39 when viewed from the cylinder axis Ax1 direction. As shown in FIG. 3, the actuator 39 is located closer to the head cover than the first end portion 601 of the cylinder head 6.
致動器39包括推壓切換銷構件35之桿391、及驅動桿391之本體部392。桿391之中心軸線與凸輪軸線Ax3平行。桿391係以於切換銷構件35之擺動範圍內自凸輪軸線Ax3方向觀察時與切換銷構件35重疊之方式配置。桿391由本體部392驅動,藉此推壓切換銷構件35。桿391係接近於上述第1支撐壁612而配置。如圖4所示,第1支撐壁612包括與桿391之側面對向之凹部620。凹部620具有為避開桿391而凹陷之形狀。 The actuator 39 includes a rod 391 that pushes the switching pin member 35, and a body portion 392 that drives the rod 391. The central axis of the rod 391 is parallel to the cam axis Ax3. The rod 391 is disposed so as to overlap the switching pin member 35 when viewed in the direction of the cam axis Ax3 in the swing range of the switching pin member 35. The lever 391 is driven by the body portion 392, thereby pushing the switching pin member 35. The rod 391 is disposed close to the first support wall 612 described above. As shown in FIG. 4, the first support wall 612 includes a recess 620 that faces the side of the rod 391. The recess 620 has a shape that is recessed to avoid the rod 391.
致動器39配置於引擎1之外方。致動器39安裝於頭蓋7。詳細而言,本體部392安裝於頭蓋7。桿391支撐於頭蓋7。如圖3所示,於頭蓋7設置有貫通孔704,且桿391通過貫通孔704。 The actuator 39 is disposed outside the engine 1. The actuator 39 is mounted to the head cover 7. In detail, the main body portion 392 is attached to the head cover 7. The rod 391 is supported by the head cover 7. As shown in FIG. 3, the head cover 7 is provided with a through hole 704, and the rod 391 passes through the through hole 704.
圖10係自氣缸軸線Ax1方向觀察氣缸頭6及頭蓋7而得之圖。如圖2及圖10所示,致動器39係於引擎1之外部安裝於頭蓋7。致動器39係安裝於第1外殼側壁702。致動器39係以不與火星塞12之軸線之延長線重疊之方式配置。於第1外殼側壁702,設置有第1凸座部705及第2凸座部706。第1凸座部705與第2凸座部706係於凸輪軸線Ax3方向朝氣缸頭6之外方自第1外殼側壁702突出。第1凸座部705與第2凸座部706係於與凸輪軸線Ax3及氣缸軸線Ax1垂直之方向並排配置。致動器39包括自本體部392突出之凸緣部393。凸緣部393係藉由螺栓51、52而固定於第1凸座部705及第2凸座部706。藉此,致動器39被固定於第1外殼側壁702。 Fig. 10 is a view showing the cylinder head 6 and the head cover 7 as viewed from the cylinder axis Ax1 direction. As shown in FIGS. 2 and 10, the actuator 39 is attached to the head cover 7 outside the engine 1. The actuator 39 is attached to the first outer casing side wall 702. The actuator 39 is disposed so as not to overlap the extension line of the axis of the spark plug 12. The first boss portion 705 and the second boss portion 706 are provided on the first case side wall 702. The first boss portion 705 and the second boss portion 706 protrude from the first outer casing side wall 702 toward the outside of the cylinder head 6 in the direction of the cam axis Ax3. The first boss portion 705 and the second boss portion 706 are arranged side by side in a direction perpendicular to the cam axis Ax3 and the cylinder axis Ax1. The actuator 39 includes a flange portion 393 that protrudes from the body portion 392. The flange portion 393 is fixed to the first boss portion 705 and the second boss portion 706 by bolts 51 and 52. Thereby, the actuator 39 is fixed to the first outer casing side wall 702.
圖11係自與凸輪軸線Ax3及氣缸軸線Ax1垂直之方向觀察到之引擎1之一部分之剖面圖。如圖11所示,氣缸頭6、氣缸體5及曲柄軸箱3係藉由第1緊固螺栓61及第2緊固螺栓62而緊固。氣缸頭6、氣缸體5及曲柄軸箱3係藉由未圖示之第3緊固螺栓及第4緊固螺栓而緊固。第1緊固螺栓61包括第1頭部65。第2緊固螺栓62包括第2頭部66。第3緊固螺栓包括圖6所示之第3頭部67。第4緊固螺栓包括圖6所示之第4頭部68。第1~第4頭部65-68被固定於氣缸頭6。第1頭部65包括與第1緊固螺栓61之軸部分開之螺帽,但該螺帽亦可與緊固螺栓61之軸部為一體。關於第2~第4頭部66-68,亦與第1頭部65相同。 Figure 11 is a cross-sectional view of a portion of the engine 1 as seen from a direction perpendicular to the cam axis Ax3 and the cylinder axis Ax1. As shown in FIG. 11, the cylinder head 6, the cylinder block 5, and the crankcase 3 are fastened by the first fastening bolt 61 and the second fastening bolt 62. The cylinder head 6, the cylinder block 5, and the crank axle box 3 are fastened by a third fastening bolt and a fourth fastening bolt (not shown). The first fastening bolt 61 includes a first head portion 65. The second fastening bolt 62 includes a second head portion 66. The third fastening bolt includes a third head portion 67 as shown in FIG. The fourth fastening bolt includes a fourth head portion 68 as shown in FIG. The first to fourth heads 65 to 68 are fixed to the cylinder head 6. The first head portion 65 includes a nut that is partially open to the shaft of the first fastening bolt 61. However, the nut may be integral with the shaft portion of the fastening bolt 61. The second to fourth head portions 66-68 are also the same as the first head portion 65.
第1頭部65與第2頭部66係於凸輪軸線Ax3方向並排配置。第3頭部67與第4頭部68係於凸輪軸線Ax3方向並排配置。第1頭部65與第3頭部67係於與凸輪軸線Ax3及氣缸軸線Ax1垂直之方向並排配置。第2頭部66與第4頭部68係於與凸輪軸線Ax3及氣缸軸線Ax1垂直之方向並排配置。 The first head portion 65 and the second head portion 66 are arranged side by side in the direction of the cam axis Ax3. The third head portion 67 and the fourth head portion 68 are arranged side by side in the direction of the cam axis Ax3. The first head portion 65 and the third head portion 67 are arranged side by side in a direction perpendicular to the cam axis Ax3 and the cylinder axis Ax1. The second head portion 66 and the fourth head portion 68 are arranged side by side in a direction perpendicular to the cam axis Ax3 and the cylinder axis Ax1.
第1頭部65於凸輪軸線Ax3方向配置於第1氣缸側壁603與第2頭部66之間。第1氣缸側壁603較第2氣缸側壁604更靠近第1頭部65。第1頭 部65配置於第1氣缸側壁603之第1突出壁部605內。於自氣缸體5之氣缸軸線Ax1方向觀察時,第1頭部65與致動器39重疊。切換銷構件35之軸線係於與凸輪軸線Ax3及氣缸軸線Ax1垂直之方向,相對於第1頭部65之中心位於進氣搖動軸33側。切換銷構件35之軸線係於與凸輪軸線Ax3及氣缸軸線Ax1垂直之方向,位於第1頭部65之中心與進氣搖動軸33之間。 The first head portion 65 is disposed between the first cylinder side wall 603 and the second head portion 66 in the direction of the cam axis Ax3. The first cylinder side wall 603 is closer to the first head portion 65 than the second cylinder side wall 604. First head The portion 65 is disposed in the first protruding wall portion 605 of the first cylinder side wall 603. The first head portion 65 overlaps the actuator 39 when viewed from the cylinder axis Ax1 direction of the cylinder block 5. The axis of the switching pin member 35 is perpendicular to the cam axis Ax3 and the cylinder axis Ax1, and is located on the intake rocking shaft 33 side with respect to the center of the first head portion 65. The axis of the switching pin member 35 is located between the center of the first head portion 65 and the intake rocking shaft 33 in a direction perpendicular to the cam axis Ax3 and the cylinder axis Ax1.
第2頭部66於凸輪軸線Ax3方向配置於第2氣缸側壁604與第1頭部65之間。第2氣缸側壁604較第1氣缸側壁603更靠近第2頭部66。於凸輪軸線Ax3方向,凸輪軸驅動部143配置於第2氣缸側壁604與第2頭部66之間。第2頭部66配置於第2支撐壁613上。第1頭部65與第2頭部66相對於凸輪軸線Ax3配置於進氣閥門側。凸輪軸線Ax3方向上之第1氣缸側壁603與第1頭部65之間的距離小於凸輪軸線Ax3方向上之第2氣缸側壁604與第2頭部66之間的距離。 The second head portion 66 is disposed between the second cylinder side wall 604 and the first head portion 65 in the direction of the cam axis Ax3. The second cylinder side wall 604 is closer to the second head portion 66 than the first cylinder side wall 603. The camshaft drive unit 143 is disposed between the second cylinder side wall 604 and the second head portion 66 in the cam axis Ax3 direction. The second head portion 66 is disposed on the second support wall 613. The first head portion 65 and the second head portion 66 are disposed on the intake valve side with respect to the cam axis Ax3. The distance between the first cylinder side wall 603 and the first head portion 65 in the cam axis Ax3 direction is smaller than the distance between the second cylinder side wall 604 and the second head portion 66 in the cam axis Ax3 direction.
第3頭部67於凸輪軸線Ax3方向配置於第1氣缸側壁603與第4頭部68之間。第1氣缸側壁603較第2氣缸側壁604更靠近第3頭部67。第3頭部67配置於第1氣缸側壁603之第2突出壁部606內。 The third head portion 67 is disposed between the first cylinder side wall 603 and the fourth head portion 68 in the cam axis Ax3 direction. The first cylinder side wall 603 is closer to the third head portion 67 than the second cylinder side wall 604. The third head portion 67 is disposed in the second protruding wall portion 606 of the first cylinder side wall 603.
第4頭部68於凸輪軸線Ax3方向配置於第2氣缸側壁604與第3頭部67之間。第2氣缸側壁604較第1氣缸側壁603更靠近第4頭部68。於凸輪軸線Ax3方向,凸輪軸驅動部143係配置於第2氣缸側壁604與第4頭部68之間。第4頭部68係配置於第2支撐壁613上。第3頭部67與第4頭部68相對於凸輪軸線Ax3配置於排氣閥門側。凸輪軸線Ax3方向上之第1氣缸側壁603與第3頭部67之間的距離小於凸輪軸線Ax3方向上之第2氣缸側壁604與第4頭部68之間的距離。 The fourth head portion 68 is disposed between the second cylinder side wall 604 and the third head portion 67 in the cam axis Ax3 direction. The second cylinder side wall 604 is closer to the fourth head portion 68 than the first cylinder side wall 603. The camshaft drive unit 143 is disposed between the second cylinder side wall 604 and the fourth head portion 68 in the cam axis Ax3 direction. The fourth head portion 68 is disposed on the second support wall 613. The third head portion 67 and the fourth head portion 68 are disposed on the exhaust valve side with respect to the cam axis Ax3. The distance between the first cylinder side wall 603 and the third head portion 67 in the cam axis Ax3 direction is smaller than the distance between the second cylinder side wall 604 and the fourth head portion 68 in the cam axis Ax3 direction.
如圖11所示,第1外殼側壁702之內表面與第2外殼側壁703之內表面係以第1外殼側壁702與第2外殼側壁703之間朝向頭蓋側變窄之方式傾斜。 As shown in FIG. 11, the inner surface of the first outer casing side wall 702 and the inner surface of the second outer casing side wall 703 are inclined such that the first outer casing side wall 702 and the second outer casing side wall 703 are narrowed toward the head cover side.
氣缸頭6包括供第1緊固螺栓61配置之第1貫通孔621、及供第2緊固螺栓62配置之第2貫通孔622。第1貫通孔621與第2貫通孔622係沿氣缸軸線Ax1方向延伸。第2貫通孔622係以通過第2支撐壁613之方式設置。如圖12所示,自包括曲柄軸線Ax2且與氣缸體5之氣缸軸線Ax1垂直之第3假想平面P3至氣缸軸線Ax1方向上之第1頭部65之距離D1小於自第3假想平面P3至氣缸軸線Ax1方向上之第2頭部66之距離D2。即,第1頭部65位於較第2頭部66更靠氣缸體側。 The cylinder head 6 includes a first through hole 621 in which the first fastening bolts 61 are disposed, and a second through hole 622 in which the second fastening bolts 62 are disposed. The first through hole 621 and the second through hole 622 extend in the cylinder axis line Ax1 direction. The second through hole 622 is provided to pass through the second support wall 613. As shown in FIG. 12, the distance D1 from the third imaginary plane P3 including the crank axis Ax2 and perpendicular to the cylinder axis Ax1 of the cylinder block 5 to the first head 65 in the cylinder axis Ax1 direction is smaller than the distance from the third imaginary plane P3 to The distance D2 of the second head portion 66 in the cylinder axis Ax1 direction. That is, the first head portion 65 is located closer to the cylinder block side than the second head portion 66.
於自凸輪軸線Ax3方向觀察時,第1緊固螺栓61與頭蓋7不重疊。即,第1頭部65位於較氣缸頭6之第1端部601更靠氣缸體側。於自凸輪軸線Ax3方向觀察時,第2緊固螺栓62與頭蓋7重疊。即,第2頭部66位於較氣缸頭6之第1端部601更靠頭蓋側。 When viewed from the direction of the cam axis Ax3, the first fastening bolt 61 does not overlap the head cover 7. That is, the first head portion 65 is located closer to the cylinder block side than the first end portion 601 of the cylinder head 6. The second fastening bolt 62 overlaps the head cover 7 when viewed in the direction of the cam axis Ax3. That is, the second head portion 66 is located closer to the head cover than the first end portion 601 of the cylinder head 6.
雖然省略了圖示,但第3頭部67位於與第1頭部65相同之高度,第4頭部68位於與第2頭部66相同之高度。因此,第3頭部67位於較第4頭部68更靠氣缸體側。 Although not shown, the third head portion 67 is located at the same height as the first head portion 65, and the fourth head portion 68 is located at the same height as the second head portion 66. Therefore, the third head portion 67 is located closer to the cylinder block side than the fourth head portion 68.
於本實施形態之引擎1中,氣缸頭6之第1端部601與頭蓋7之端部701係配置於與凸輪軸14重疊之高度。因此,可使引擎1小型化且可提高對排氣用閥門24、25及進氣用閥門26、27之軸端之可接近性。 In the engine 1 of the present embodiment, the first end portion 601 of the cylinder head 6 and the end portion 701 of the head cover 7 are disposed at a height overlapping the cam shaft 14. Therefore, the size of the engine 1 can be reduced, and the accessibility to the shaft ends of the exhaust valves 24 and 25 and the intake valves 26 and 27 can be improved.
又,連接於第1氣缸側壁603之第1外殼側壁702之內表面隨著自第1外殼側壁702之端部向頭蓋側離開,而於凸輪軸線方向上向朝第1頭部65之方向傾斜。因此,第1頭部65之位置越位於頭蓋側,第1頭部65與第1外殼側壁702之內表面之間之距離越小。此情形時,為了於第1外殼側壁702之內表面與第1頭部65之間確保間隙,引擎1大型化。 Further, the inner surface of the first outer casing side wall 702 connected to the first cylinder side wall 603 is inclined toward the first head portion 65 in the cam axis direction as it goes away from the end portion of the first outer casing side wall 702 toward the head cover side. . Therefore, the position of the first head portion 65 is located on the side of the head cover, and the distance between the first head portion 65 and the inner surface of the first outer casing side wall 702 is smaller. In this case, in order to ensure a gap between the inner surface of the first outer casing side wall 702 and the first head portion 65, the engine 1 is increased in size.
但是,於本態樣之引擎1中,第1頭部65配置於較第2頭部66更靠氣缸體側,藉此可使引擎1小型化。 However, in the engine 1 of the present aspect, the first head portion 65 is disposed closer to the cylinder block than the second head portion 66, whereby the engine 1 can be downsized.
進而,與第1頭部65相對於第1氣缸側壁603之位置相比,第2頭部66係自第2氣缸側壁604隔開配置。因此,即便第2頭部66配置於較 第1頭部65更靠頭蓋側,亦可抑制引擎1之大型化且確保第2外殼側壁703與第2頭部66之間之間隙。又,藉由將第2頭部66配置於較第1頭部65更靠頭蓋側,可提高氣缸頭6之剛性。 Further, the second head portion 66 is spaced apart from the second cylinder side wall 604 than the position of the first head portion 65 with respect to the first cylinder side wall 603. Therefore, even if the second head 66 is disposed in comparison The first head portion 65 is further on the side of the head cover, and it is also possible to suppress an increase in size of the engine 1 and to secure a gap between the second outer casing side wall 703 and the second head portion 66. Further, by arranging the second head portion 66 on the side of the head cover from the first head portion 65, the rigidity of the cylinder head 6 can be improved.
如上所述,於本實施形態之引擎1中,可使引擎1小型化,且可提高對排氣用閥門24、25及進氣用閥門26、27之軸端之可接近性。 As described above, in the engine 1 of the present embodiment, the engine 1 can be downsized, and the accessibility to the axial ends of the exhaust valves 24 and 25 and the intake valves 26 and 27 can be improved.
於自凸輪軸線Ax3方向觀察時,第1緊固螺栓61與頭蓋7不重疊。藉此,可使引擎1小型化。 When viewed from the direction of the cam axis Ax3, the first fastening bolt 61 does not overlap the head cover 7. Thereby, the engine 1 can be miniaturized.
第2支撐壁613包括供第2緊固螺栓62配置之貫通孔622。因此,可抑制第2支撐壁613之大型化,且可藉由第2緊固螺栓62而提高第2支撐壁613之強度。藉此,可使引擎1小型化。 The second support wall 613 includes a through hole 622 in which the second fastening bolts 62 are disposed. Therefore, the increase in size of the second support wall 613 can be suppressed, and the strength of the second support wall 613 can be increased by the second fastening bolts 62. Thereby, the engine 1 can be miniaturized.
於頭蓋7安裝有致動器39。因此,即便將致動器39接近於切換銷構件35而配置,與將致動器39安裝於氣缸頭6之情形相比,亦可抑制自氣缸頭6內之燃燒室11對致動器39之熱影響。藉此,可抑制對致動器39之熱影響且可使引擎1小型化。 An actuator 39 is mounted to the head cover 7. Therefore, even if the actuator 39 is disposed close to the switching pin member 35, the combustion chamber 11 from the cylinder head 6 to the actuator 39 can be suppressed as compared with the case where the actuator 39 is attached to the cylinder head 6. The heat effect. Thereby, the thermal influence on the actuator 39 can be suppressed and the engine 1 can be miniaturized.
於自氣缸軸線Ax1方向觀察時,致動器39與氣缸頭6之第1端部601及頭蓋7之端部701重疊。此情形時,致動器39與切換銷構件35之距離變短,藉此可減小切換銷構件35所需之驅動力。藉此,可使致動器39小型化,且可使引擎1進一步小型化。 The actuator 39 overlaps the first end portion 601 of the cylinder head 6 and the end portion 701 of the head cover 7 when viewed from the cylinder axis Ax1 direction. In this case, the distance between the actuator 39 and the switching pin member 35 becomes short, whereby the driving force required to switch the pin member 35 can be reduced. Thereby, the actuator 39 can be miniaturized, and the engine 1 can be further miniaturized.
於自氣缸軸線Ax1方向觀察時,第1緊固螺栓61與致動器39重疊。即,可利用第1緊固螺栓61之頭蓋側之空間,相對於氣缸頭6更近接配置致動器39。藉此,可使引擎1進一步小型化。 The first fastening bolt 61 overlaps the actuator 39 when viewed from the cylinder axis Ax1 direction. In other words, the actuator 39 can be disposed closer to the cylinder head 6 by the space on the head cover side of the first fastening bolt 61. Thereby, the engine 1 can be further miniaturized.
以上,對本發明之一實施形態進行了說明,但本發明並不限定於上述實施形態,可於不脫離發明之主旨之範圍內進行各種變更。 The embodiment of the present invention has been described above, but the present invention is not limited to the embodiment described above, and various modifications can be made without departing from the spirit and scope of the invention.
引擎1並不限定於水冷式之單氣缸引擎。例如引擎1亦可為空冷式。引擎1亦可包括複數個氣缸。 The engine 1 is not limited to a water-cooled single cylinder engine. For example, the engine 1 can also be air-cooled. The engine 1 can also include a plurality of cylinders.
排氣用閥門之數量並不限定於2個,亦可為1個或3個以上。進氣 用閥門之數量並不限定於2個,亦可為1個或3個以上。 The number of valves for exhausting is not limited to two, and may be one or three or more. Intake The number of valves used is not limited to two, and may be one or three or more.
第1頭部65、第2頭部66、第3頭部67及第4頭部68之位置並不限定於上述實施形態之位置,亦可進行變更。例如於上述之實施形態中,第1頭部65於凸輪軸14方向與頭蓋7不重疊,但第1頭部65亦可於凸輪軸14方向與頭蓋7重疊。即,第1頭部65亦可位於較頭蓋7之端部701更靠頭蓋側。或第3頭部67亦可位於與第1頭部65不同之高度。例如,第3頭部67亦可位於與第2頭部66相同之高度。第4頭部68亦可同樣地位於與第2頭部66不同之高度。 The positions of the first head portion 65, the second head portion 66, the third head portion 67, and the fourth head portion 68 are not limited to the positions of the above-described embodiments, and may be changed. For example, in the above-described embodiment, the first head portion 65 does not overlap the head cover 7 in the direction of the cam shaft 14, but the first head portion 65 may overlap the head cover 7 in the direction of the cam shaft 14. That is, the first head portion 65 may be located closer to the head cover than the end portion 701 of the head cover 7. Alternatively, the third head portion 67 may be located at a different height from the first head portion 65. For example, the third head portion 67 may be located at the same height as the second head portion 66. The fourth head portion 68 can also be located at a different height from the second head portion 66.
包括氣缸頭6之第1端部601之第1假想平面P1、及包括頭蓋7之端部701之第2假想平面P2只要與凸輪軸14重疊便可,亦可配置於與凸輪軸線Ax3相同之高度、或配置於較凸輪軸線Ax3更靠氣缸體側。 The first imaginary plane P1 including the first end portion 601 of the cylinder head 6 and the second imaginary plane P2 including the end portion 701 of the head cover 7 may be disposed in the same manner as the cam axis Ax3 as long as they overlap the cam shaft 14. The height or the arrangement is closer to the cylinder block side than the cam axis Ax3.
閥動機構13之構成及配置並不限定於上述之實施形態,亦可進行變更。例如,致動器39亦可安裝於氣缸頭6。或致動器39亦可以於自氣缸軸線Ax1方向觀察時與頭蓋7之端部701不重疊之方式配置。或致動器39亦可以於自氣缸軸線Ax1方向觀察時與第1頭部65不重疊之方式配置。亦可不限定於致動器39之一部分,而使致動器39之全部位於較氣缸頭6之第1端部601更靠內側。 The configuration and arrangement of the valve actuation mechanism 13 are not limited to the above-described embodiments, and may be modified. For example, the actuator 39 can also be mounted to the cylinder head 6. Alternatively, the actuator 39 may be disposed so as not to overlap the end portion 701 of the head cover 7 when viewed from the direction of the cylinder axis Ax1. Alternatively, the actuator 39 may be disposed so as not to overlap the first head portion 65 when viewed from the cylinder axis Ax1 direction. It is not limited to one portion of the actuator 39, and all of the actuators 39 are located further inside than the first end portion 601 of the cylinder head 6.
於上述之實施形態中,藉由致動器而切換閥門之開閉之時序之機構可用於進氣用閥門,亦可用於排氣用閥門。即,與上述包括第1搖臂36、第2搖臂37、切換銷構件35及致動器39之機構相同之機構亦可設置用來開閉排氣用閥門。或者,藉由致動器而切換閥門之開閉之時序之機構亦可不用於進氣用閥門及排氣閥門中之任一者。 In the above embodiment, the mechanism for switching the timing of opening and closing of the valve by the actuator can be used for the intake valve or the exhaust valve. That is, the same mechanism as the above-described mechanism including the first rocker arm 36, the second rocker arm 37, the switching pin member 35, and the actuator 39 may be provided to open and close the exhaust valve. Alternatively, the mechanism for switching the timing of opening and closing of the valve by the actuator may not be used for any of the intake valve and the exhaust valve.
7‧‧‧頭蓋 7‧‧‧ head cover
12‧‧‧火星塞 12‧‧‧Mars plug
39‧‧‧致動器 39‧‧‧Actuator
51‧‧‧螺栓 51‧‧‧ bolt
52‧‧‧螺栓 52‧‧‧Bolts
392‧‧‧本體部 392‧‧‧ Body Department
393‧‧‧凸緣部 393‧‧‧Flange
610‧‧‧排氣管之連接部 610‧‧‧ connection of the exhaust pipe
702‧‧‧第1外殼側壁 702‧‧‧1st outer casing side wall
703‧‧‧第2外殼側壁 703‧‧‧2nd casing side wall
705‧‧‧第1凸座部 705‧‧‧1st seat
706‧‧‧第2凸座部 706‧‧‧2nd seat
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JP (1) | JP6105410B2 (en) |
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Publication number | Priority date | Publication date | Assignee | Title |
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JP2018197498A (en) * | 2015-10-15 | 2018-12-13 | ヤマハ発動機株式会社 | Engine for saddle-type vehicle |
US10995696B2 (en) * | 2018-07-06 | 2021-05-04 | Honda Motor Co., Ltd. | Engine |
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US3895868A (en) * | 1972-05-05 | 1975-07-22 | Renault | Structure of internal combustion engines |
US4136648A (en) * | 1976-12-22 | 1979-01-30 | Ford Motor Company | Low weight reciprocating engine |
SE443021B (en) * | 1979-09-03 | 1986-02-10 | Yanmar Diesel Engine Co | FORBRENNINGSMOTOR |
JPS608450A (en) * | 1983-06-28 | 1985-01-17 | Hino Motors Ltd | Overhead camshaft engine |
JPH03217646A (en) * | 1990-01-22 | 1991-09-25 | Nissan Motor Co Ltd | Integrated cylinder block of internal combustion engine |
US5101777A (en) * | 1990-02-20 | 1992-04-07 | Yamaha Hatsudoki Kabushiki Kaisha | Automobile engine structure |
US5119776A (en) * | 1991-09-30 | 1992-06-09 | Chrysler Corporation | Compact bearing cap for overhead camshaft |
JP2000248912A (en) * | 1999-03-01 | 2000-09-12 | Fuji Heavy Ind Ltd | Camshaft drive unit for ohc engine |
JP3767256B2 (en) * | 1999-07-21 | 2006-04-19 | 日産自動車株式会社 | Lubricating device for internal combustion engine |
JP4382010B2 (en) * | 2005-06-23 | 2009-12-09 | 本田技研工業株式会社 | Engine valve gear |
JP2010156202A (en) * | 2007-04-05 | 2010-07-15 | Yamaha Motor Co Ltd | Engine |
JP4749400B2 (en) * | 2007-08-27 | 2011-08-17 | 本田技研工業株式会社 | Forced air-cooled internal combustion engine |
JP5049874B2 (en) * | 2008-05-21 | 2012-10-17 | 本田技研工業株式会社 | Cylinder head structure in engine |
JP5411555B2 (en) * | 2009-03-31 | 2014-02-12 | 本田技研工業株式会社 | Internal combustion engine |
JP5525403B2 (en) * | 2010-09-30 | 2014-06-18 | 本田技研工業株式会社 | Variable valve operating device for internal combustion engine |
JP5513365B2 (en) * | 2010-12-27 | 2014-06-04 | 本田技研工業株式会社 | Variable valve operating device for internal combustion engine |
JP5771494B2 (en) * | 2011-09-28 | 2015-09-02 | 本田技研工業株式会社 | Variable valve operating device for internal combustion engine |
-
2013
- 2013-06-28 JP JP2013136581A patent/JP6105410B2/en active Active
- 2013-10-15 BR BR102013026549-7A patent/BR102013026549B1/en active IP Right Grant
- 2013-10-16 TW TW102137375A patent/TWI558909B/en active
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- 2013-10-21 PH PH12013000317A patent/PH12013000317A1/en unknown
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- 2013-10-30 ES ES13190931.9T patent/ES2628364T3/en active Active
- 2013-10-30 EP EP13190931.9A patent/EP2860381B1/en active Active
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JP6105410B2 (en) | 2017-03-29 |
CO7260134A1 (en) | 2015-05-08 |
ES2628364T3 (en) | 2017-08-02 |
TW201500636A (en) | 2015-01-01 |
TW201706495A (en) | 2017-02-16 |
CN104251164B (en) | 2017-01-18 |
EP3130778A1 (en) | 2017-02-15 |
JP2015010552A (en) | 2015-01-19 |
PH12013000317B1 (en) | 2015-04-27 |
TWI558909B (en) | 2016-11-21 |
EP2860381A1 (en) | 2015-04-15 |
EP3130778B1 (en) | 2023-08-02 |
BR102013026549A2 (en) | 2017-11-07 |
CN104251164A (en) | 2014-12-31 |
BR102013026549B1 (en) | 2022-02-08 |
EP2860381B1 (en) | 2017-05-31 |
PH12013000317A1 (en) | 2015-04-27 |
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