JPH0159404B2 - - Google Patents
Info
- Publication number
- JPH0159404B2 JPH0159404B2 JP56148187A JP14818781A JPH0159404B2 JP H0159404 B2 JPH0159404 B2 JP H0159404B2 JP 56148187 A JP56148187 A JP 56148187A JP 14818781 A JP14818781 A JP 14818781A JP H0159404 B2 JPH0159404 B2 JP H0159404B2
- Authority
- JP
- Japan
- Prior art keywords
- intake
- exhaust
- crankshaft
- shaped space
- engine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000002485 combustion reaction Methods 0.000 claims description 7
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 1
Classifications
-
- 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
- F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
- F02B61/02—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving cycles
-
- 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
- F02B75/18—Multi-cylinder engines
- F02B75/22—Multi-cylinder engines with cylinders in V, fan, or star arrangement
-
- 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
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four
-
- 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
- F02B75/18—Multi-cylinder engines
- F02B2075/1804—Number of cylinders
- F02B2075/1816—Number of cylinders four
-
- 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
- F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
- F02B2275/18—DOHC [Double overhead camshaft]
-
- 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
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
- F02F2001/244—Arrangement of valve stems in cylinder heads
- F02F2001/245—Arrangement of valve stems in cylinder heads the valve stems being orientated at an angle with the cylinder axis
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Description
【発明の詳細な説明】
本発明は、それぞれ気筒を備えた第１及び第２
エンジンブロツクをＶ字状に配置し、各エンジン
ブロツクの頭部に一部の吸、排気用カム軸を備え
た動弁機構を設けたＶ型内燃機関に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention provides first and second
The present invention relates to a V-type internal combustion engine in which engine blocks are arranged in a V-shape, and a valve mechanism with part of intake and exhaust camshafts is provided at the head of each engine block.
Ｖ型内燃機関において、第１及び第２エンジン
ブロツクの相対向面に各気筒の吸気ポートを開口
して、各気筒のための気化器その他の吸気系を両
エンジンブロツク間に配設することは、両エンジ
ンブロツク間のＶ字状空間を有効に利用できて機
関の小型化を図る上に有利である。しかしなが
ら、各エンジンブロツクの頭部に前記形式の動弁
機構を設ける場合、シーソー式ロツカアームを使
用すると、吸、排気用カム軸及びロツカアームが
各エンジンブロツクの前後に張出してその頭部を
膨大化させ、したがつて両エンジンブロツク間の
Ｖ字状空間を狭めるため、その空間への吸気系の
設置が極めて困難になる。そこで、各エンジンブ
ロツクの頭部の膨大化を避けるべくロツカアーム
を廃し、吸、排気用カム軸より吸、排気弁をそれ
ぞれ直接的に押圧開放し得るようにすると、吸、
排気用カム軸に邪魔されて弁間〓の調節作業が極
めて困難となる不都合を招く。 In a V-type internal combustion engine, it is possible to open the intake ports of each cylinder on opposite sides of the first and second engine blocks, and to dispose the carburetor and other intake systems for each cylinder between the two engine blocks. , the V-shaped space between the two engine blocks can be effectively utilized, which is advantageous in reducing the size of the engine. However, when installing the above-mentioned type of valve mechanism at the head of each engine block, if a seesaw type rocker arm is used, the intake and exhaust camshafts and rocker arms will protrude from the front and rear of each engine block, making the head huge. Therefore, since the V-shaped space between the two engine blocks is narrowed, it becomes extremely difficult to install an intake system in that space. Therefore, in order to avoid the enlargement of the head of each engine block, the rocker arm was eliminated and the intake and exhaust valves could be opened by pressing directly from the intake and exhaust camshafts, respectively.
This causes an inconvenience in that it is extremely difficult to adjust the valve gap because it is obstructed by the exhaust camshaft.
本発明は、そのような問題を克服すべく提案さ
れたものであつて、各エンジンブロツク間のＶ字
状空間への気化器の設置を前記動弁機構が妨げ
ず、しかも弁間〓の調節を容易に行い得るように
し、さらに該Ｖ字状空間に気化器群を、その取付
けの自由度を充分確保しつつコンパクト且つ確的
に配置できるようにした、前記Ｖ型内燃機関を提
供することを目的とする。 The present invention has been proposed in order to overcome such problems, and is such that the valve mechanism does not obstruct the installation of the carburetor in the V-shaped space between each engine block, and furthermore, it is possible to adjust the valve spacing. To provide the V-type internal combustion engine, in which the carburetor group can be arranged compactly and precisely in the V-shaped space while ensuring a sufficient degree of freedom in its installation. With the goal.
そしてこの目的を達成するために本発明は、そ
れぞれ気筒を備えた第１、第２エンジンブロツク
を、その両エンジンブロツク間にＶ字状空間が形
成されるようＶ字状に配置し、そのＶ字状空間を
挟んで相対向する、第１、第２エンジンエンジン
ブロツクの気筒相互をクランク軸方向に所定量オ
フセツトして配置すると共に、該第１、第２エン
ジンブロツクの、前記Ｖ字状空間を挟んで相対向
する内側面に前記各気筒の吸気ポートを、またそ
れらの外側面に同排気ポートをそれぞれ開口し、
これら吸、排気ポートを開閉する吸、排気弁の上
方、且つこれら吸、排気弁の中心軸線を境として
前記気筒の中心軸線と反対側に一対の吸、排気用
カム軸を配置し、これら吸、排気用カム軸と前記
吸、排気弁との各間に、各カム軸の開弁力を各弁
に伝達する吸、排気用ロツカアームをそれぞれ介
装すると共に、それら吸、排気用ロツカアームの
基端を揺動自在に支持する支軸をこれらロツカア
ームと吸、排気用カム軸との各接触点を境として
前記吸、排気弁の中心軸線と反対側にそれぞれ配
置し、さらに前記第１、第２エンジンブロツク
の、前記Ｖ字状空間を挟んで相対向する気筒の吸
気ポートにそれぞれ接続される一対の気化器を、
その両気化器相互が該Ｖ字状空間内においてクラ
ンク軸方向に所定量オフセツトするよう配設する
と共に、該一対の気化器の、上流端に吸入口を有
する筒状入口管を、その両入口管相互がクランク
軸の軸線方向に近接し且つＸ字状に交差するよう
配置したことを特徴とする。 In order to achieve this object, the present invention arranges first and second engine blocks, each having a cylinder, in a V-shape so that a V-shaped space is formed between the two engine blocks. The cylinders of the first and second engine blocks, which face each other across the letter-shaped space, are arranged offset by a predetermined amount in the direction of the crankshaft, and the cylinders of the first and second engine blocks are arranged so as to be offset by a predetermined amount from each other in the crankshaft direction, and the cylinders of the first and second engine blocks face each other across the letter-shaped space. The intake ports of each cylinder are opened on the inner surfaces facing each other with the cylinders in between, and the exhaust ports of the cylinders are opened on the outer surfaces thereof, respectively,
A pair of intake and exhaust camshafts are arranged above the intake and exhaust valves that open and close these intake and exhaust ports, and on the opposite side of the center axis of the cylinder with the center axis of the intake and exhaust valves as the border. Suction and exhaust rocker arms are interposed between the exhaust camshaft and the suction and exhaust valves to transmit the valve opening force of each camshaft to each valve, and the bases of these suction and exhaust rocker arms are interposed. Support shafts whose ends are swingably supported are disposed on opposite sides of the central axes of the intake and exhaust valves, with the contact points between the rocker arms and the intake and exhaust camshafts as boundaries, and A pair of carburetors each connected to the intake ports of cylinders facing each other across the V-shaped space of the two engine blocks,
The two carburetors are arranged so as to be offset from each other by a predetermined amount in the crankshaft direction within the V-shaped space, and a cylindrical inlet pipe having an inlet at the upstream end of the pair of carburetors is connected to the inlet of each of the two carburetors. It is characterized in that the tubes are arranged close to each other in the axial direction of the crankshaft and intersect in an X-shape.
以下、図面により本発明の一実施例について説
明すると、第１図においてＥは自動二輪車の車体
フレームＦのメインパイプFm直下に搭載される
Ｖ型内燃機関で、クランクケース１に支持される
クランク軸２は車両の左右方向に配置され、この
クランク軸２を共有する第１及び第２エンジンブ
ロツク３1，３2はＶ字状をなして前後に配置さ
れ、その両エンジンブロツク３1，３2間には、ク
ランク軸方向外方より見てＶ字状の空間１０が形
成される。 Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In FIG. 1, E is a V-type internal combustion engine mounted directly below the main pipe Fm of the body frame F of a motorcycle, and the crankshaft supported by the crankcase 1. 2 is arranged in the left-right direction of the vehicle, and the first and second engine blocks 3 1 , 3 2 sharing the crankshaft 2 are arranged in a V-shape in the front and rear . A V-shaped space 10 is formed in between when viewed from the outside in the crankshaft direction.
第２図に示すように、第１、第２エンジンブロ
ツク３1，３2は気筒４1，４2をそれぞれ２本宛備
え、気筒４1のピストンに連なるコンロツド５1の
大端部はクランク軸２のクランクピン２ａの右半
部（図では上半部）に、また気筒４2のピストン
に連なるコンロツド５2の大端部は同クランクピ
ン２ｂの左半部（図では下半部）にそれぞれ連結
される。その結果、第１エンジンブロツク３1の
気筒４1に対して、それとＶ字状空間１０を間に
挟んで相対向する第２エンジンブロツク３2の気
筒４2は、隣接するコンロツド５1，５2の軸線間
距離ε1だけクランク軸２の軸線に沿つて左方（図
では下方）にオフセツトされる。 As shown in FIG. 2, the first and second engine blocks 3 1 and 3 2 each have two cylinders 4 1 and 4 2 , and the large end of the connecting rod 5 1 connected to the piston of the cylinder 4 1 is connected to the crankshaft. The right half (upper half in the figure) of the crank pin 2a of the shaft 2, and the large end of the connecting rod 52 connected to the piston of the cylinder 42 are the left half (lower half in the figure) of the crank pin 2b. are connected to each other. As a result, the cylinder 4 2 of the second engine block 3 2 that faces the cylinder 4 1 of the first engine block 3 1 with the V-shaped space 10 in between is connected to the adjacent connecting rods 5 1 , 5 . The crankshaft 2 is offset to the left (downward in the figure) along the axis of the crankshaft 2 by an inter-axle distance ε 1 of the crankshaft 2 .
第３図に示すように、各気筒４1，４2はそれぞ
れクランク軸２の軸線方向に並ぶ各一対の吸気弁
６1，６2及び排気弁７1，７2を有し、吸気弁６1，
６2に開閉される気筒４1，４2の吸気ポート８1，
８2は、Ｖ字状空間１０を間に挟んで相対向する
両エンジンブロツク３1，３2の相対向する内側面
に、また排気弁７1，７2に開閉される排気ポート
１１1，１１2はそれらの外側面にそれぞれ開口す
る。 As shown in FIG. 3, each cylinder 4 1 , 4 2 has a pair of intake valves 6 1 , 6 2 and an exhaust valve 7 1 , 7 2 which are arranged in the axial direction of the crankshaft 2 . 1 ,
Intake port 8 1 of cylinder 4 1 , 4 2 which is opened and closed at 6 2 ,
Reference numeral 8 2 denotes an exhaust port 11 1 , which is opened and closed by the exhaust valves 7 1 and 7 2 on the opposing inner surfaces of the engine blocks 3 1 and 3 2 that face each other with the V-shaped space 10 in between. 11 2 are respectively opened on their outer surfaces.
吸気ポート８1，８2の各エンジンブロツク３1，
３2内側面への開口部８1a，８2aの中心は対応す
る気筒４1，４2の中心に対して、気筒４1，４2間
のオフセツト方向に一定距離ε2オフセツトされ
る。その結果、相対向する気筒４1，４2同士の吸
気ポート開口部８1a，８2a間には、クランク軸２
の軸線方向にε1＋２・ε2という大きなオフセツト
量が与えられる。 Each engine block 3 1 , intake port 8 1 , 8 2 ,
The centers of the openings 8 1 a and 8 2 a to the inner surface of 3 2 are offset by a certain distance ε 2 from the centers of the corresponding cylinders 4 1 and 4 2 in the offset direction between the cylinders 4 1 and 4 2. . As a result, between the intake port openings 8 1 a and 8 2 a of the opposing cylinders 4 1 and 4 2 ,
A large offset amount of ε 1 +2·ε 2 is given in the axial direction.
したがつて、各気筒４1，４2の吸気系として、
吸気ポート８1，８2に所定の管路長を持つ気化器
９4，９2を直線的に接続する場合でも、第１エン
ジンブロツク３1側の気化器９1と第２エンジンブ
ロツク３2側の気化器９2とを、互いに干渉させる
ことなく両エンジンブロツク３1，３2間のＶ字状
空間１０に容易に配置することができる。その
際、第１，３図に示すように両気化器９1，９2
の、上流端に吸入口e1，e2を開口した筒状の入口
管９a1，９a2を、その両入口管９a1，９a2相互が
クランク軸方向に近接し且つそのクランク軸方向
外方より見てＸ字状に交差するように配置すれ
ば、これら気化器９1，９2の近接配置によるも、
それらの吸入口e1，e2は相互に全く異なる方向に
開口することになるから、その両気化器９1，９2
間の吸気干渉を回避することができる。 Therefore, the intake system for each cylinder 4 1 and 4 2 is as follows:
Even when the carburetors 9 4 , 9 2 having a predetermined pipe length are connected linearly to the intake ports 8 1 , 8 2 , the carburetors 9 1 on the first engine block 3 1 side and the carburetors 9 1 on the second engine block 3 2 The side carburetor 9 2 can be easily arranged in the V-shaped space 10 between the two engine blocks 3 1 and 3 2 without interfering with each other. At that time, as shown in FIGS. 1 and 3, both carburetors 9 1 and 9 2
Cylindrical inlet pipes 9a 1 and 9a 2 with suction ports e 1 and e 2 opened at the upstream ends of the inlet pipes 9a 1 and 9a 2 are adjacent to each other in the direction of the crankshaft and are located outside of the direction of the crankshaft . If the carburetors 9 1 and 9 2 are arranged so that they intersect in an X-shape when viewed from the side,
Since those suction ports e 1 and e 2 open in completely different directions, both the carburetors 9 1 and 9 2
intake interference between the two can be avoided.
第１及び第２エンジンブロツク３1，３2の頭部
には各一対の吸、排気弁６1，６2，７1，７2を開
閉する動弁機構がそれぞれ設けられるもので、そ
れらの機構は対称的構成であるので、第１エンジ
ンブロツク３1側の機構のみを第４ないし第６図
により説明する。 The heads of the first and second engine blocks 3 1 , 3 2 are provided with valve operating mechanisms for opening and closing each pair of intake and exhaust valves 6 1 , 6 2 , 7 1 , 7 2 . Since the mechanism has a symmetrical structure, only the mechanism on the first engine block 31 side will be explained with reference to FIGS. 4 to 6.
第１エンジンブロツク３1の頭部を構成するシ
リンダヘツド１２及びその上面に接合されるヘツ
ドカバー１３内に機構室１４が形成され、この機
構室１４において、吸、排気弁６1，７1をそれぞ
れ閉じ側に弾発する弁ばね１５，１６が設けら
れ、またクランク軸２と平行な一対の吸、排気用
カム軸１７，１８が、吸、排気弁６1，７1の中心
軸線Ａ，Ｂを境として気筒４1の中心軸線Ｃと反
対側に位置するよう、軸受１９により回転自在に
支承される。これらカム軸１７，１８はチエン及
びスプロケツトよりなる調時伝動装置２０を介し
てクランク軸２より駆動されるようになつてい
る。 A mechanism chamber 14 is formed within the cylinder head 12 constituting the head of the first engine block 3 1 and a head cover 13 joined to its upper surface. Valve springs 15 and 16 are provided which spring toward the closing side, and a pair of intake and exhaust camshafts 17 and 18 parallel to the crankshaft 2 align the central axes A and B of the intake and exhaust valves 6 1 and 7 1 . It is rotatably supported by a bearing 19 so as to be located on the opposite side to the central axis C of the cylinder 4 1 as a boundary. These camshafts 17, 18 are driven by the crankshaft 2 via a timing transmission device 20 consisting of a chain and a sprocket.
吸、排気用カム軸１７，１８は、それぞれ対を
なす吸気弁６1と６1、排気弁７1と７1の各間の中
央を通る平面上に配置されるカム１７ａ，１８ａ
をそれぞれ有し、前者のカム１７ａと両吸気弁６
１，６1との間に吸気用ロツカアーム２１が、また
後者のカム１８ａと両排気弁７1，７1との間に排
気用ロツカアーム２２がそれぞれ介装される。各
ロツカアーム２１，２２の基端は、吸、排気弁６
１，７1の中心軸線Ａ，Ｂを境として気筒４1の中
心軸線Ｃと反対側においてシリンダヘツド１２に
支承させた支軸２３，２４にそれぞれ回動自在に
支持される。また、各ロツカアーム２１，２２の
先端部は各一対の吸、排気弁６1，７1に向つて分
岐する二股腕２１ａ，２２ａにそれぞれ形成され
ており、吸気側の二股腕２１ａには、両吸気弁６
１の上端に当接し得る一対の調節ねじ２５が螺合
され、また、排気側の二股腕２２ａには両排気弁
７1の上端に当接し得る一対の調節ねじ２６が螺
合される。 The intake and exhaust cam shafts 17 and 18 are cams 17a and 18a arranged on a plane passing through the center between the intake valves 6 1 and 6 1 and the exhaust valves 7 1 and 7 1 , respectively, which form a pair.
The former cam 17a and both intake valves 6
1 and 6 1 , and an exhaust rocker arm 22 is interposed between the latter cam 18a and both exhaust valves 7 1 and 7 1 . The base end of each rocker arm 21, 22 has an intake and exhaust valve 6.
They are rotatably supported by support shafts 23 and 24 supported on the cylinder head 12 on the opposite side to the center axis C of the cylinder 41 with the center axes A and B of the cylinders 1 and 71 as boundaries. Further, the tip of each rocker arm 21, 22 is formed into a bifurcated arm 21a, 22a which branches toward each pair of intake and exhaust valves 6 1 , 7 1 , and the bifurcated arm 21 a on the intake side has both Intake valve 6
A pair of adjustment screws 25 that can come into contact with the upper ends of both exhaust valves 7 1 are screwed together, and a pair of adjustment screws 26 that can come into contact with the upper ends of both exhaust valves 7 1 are screwed into the bifurcated arms 22 a on the exhaust side.
調節ねじ２５，２６は、吸、排気弁６1，７1の
閉弁時に、それら弁の上端との間に規定の弁間〓
が生じるように、二股腕２１ａ，２２ａとの螺合
位置を調節され、その調節後の位置はロツクナツ
ト２７，２８によりそれぞれ固定される。 When the intake and exhaust valves 6 1 and 7 1 are closed, the adjustment screws 25 and 26 have a specified valve gap between them and the upper ends of these valves.
The screwing position with the bifurcated arms 21a, 22a is adjusted so that the forked arms 21a, 22a are engaged, and the adjusted positions are fixed by the lock nuts 27, 28, respectively.
尚、図中、２９は点火栓で、各気筒４1，４2に
おける４本の吸、排気弁６1，７1；６2，７2に囲
まれるように各気筒の略中心軸線Ｃ上に配置され
る。 In the figure, 29 is an ignition plug, which is located approximately on the center axis C of each cylinder so as to be surrounded by the four intake and exhaust valves 6 1 , 7 1 ; 6 2 , 7 2 in each cylinder 4 1 , 4 2 . will be placed in
而して、吸、排気用カム軸１７，１８がクラン
ク軸２より調時伝動装置２０を介して回転され、
それに伴いカム１７ａ，１８ａがロツカアーム２
１，２２の上面を滑りながら押圧すると、ロツカ
アーム２１，２２はそれぞれ下方に揺動して、弁
ばね１５，１６の弾発力に抗して吸、排気弁６1，
７1を開放し、またカム１７ａ，１８ａのリフト
部がロツカアーム２１，２２上を通り過ぎると、
吸、排気弁６1，７1はそれぞれの弁ばね１５，１
６の弾発力により閉鎖することができる。 Thus, the intake and exhaust camshafts 17 and 18 are rotated by the crankshaft 2 via the timing transmission 20,
Accordingly, the cams 17a and 18a are connected to the rocker arm 2.
When pressed while sliding on the upper surfaces of 1 and 22, the rocker arms 21 and 22 swing downward, respectively, and resist the elastic force of the valve springs 15 and 16 to close the intake and exhaust valves 6 1 ,
7 1 is released and the lift parts of the cams 17a and 18a pass over the rocker arms 21 and 22,
Suction and exhaust valves 6 1 and 7 1 are connected to respective valve springs 15 and 1
It can be closed by the elastic force of 6.
以上のように本発明によれば、それぞれ気筒を
備えた第１、第２エンジンブロツクを、その両エ
ンジンブロツク間にＶ字状空間が形成されるよう
Ｖ字状に配置し、そのＶ字状空間を挟んで相対向
する、第１、第２エンジンエンジンブロツクの内
側面に前記各気筒の吸気ポートを、またそれらの
外側面に同排気ポートをそれぞれ開口し、これら
吸、排気ポートを開閉する吸、排気弁の上方、且
つこれら吸、排気弁の中心軸線を境として前記気
筒の中心軸線と反対側に一対の吸、排気用カム軸
を配置し、これら吸、排気用カム軸と前記吸、排
気弁との各間に、各カム軸の開弁力を各弁に伝達
する吸、排気用ロツカアームをそれぞれ介装する
と共に、それら吸、排気用ロツカアームの基端を
揺動自在に支持する支軸をこれらロツカアームと
吸、排気用カム軸との各接触点を境として前記
吸、排気弁の中心軸線と反対側にそれぞれ配置し
たので、吸、排気用カム軸を吸、排気弁にそれぞ
れ近接して配置することができ、したがつて各エ
ンジンブロツクの頭部の小型化を達成でき両エン
ジンブロツク間のＶ字状空間を充分広く確保する
ことができるから、前記各吸気ポートに連なる気
化器群の該Ｖ字状空間における取付けの自由度を
高めることができる。しかも、吸、排気用カム軸
の吸、排気弁中心軸外側への配置により、両カム
軸間に広い作業空間が得られるから、吸、排気用
ロツカアームの採用と相俟つて各部弁間〓の調節
作業を容易に行うことができる。 As described above, according to the present invention, the first and second engine blocks each having a cylinder are arranged in a V-shape so that a V-shaped space is formed between the two engine blocks, and the V-shaped The intake ports of the respective cylinders are opened on the inner surfaces of the first and second engine blocks, which face each other with a space in between, and the same exhaust ports are opened on the outer surfaces thereof, and these intake and exhaust ports are opened and closed. A pair of intake and exhaust camshafts are disposed above the intake and exhaust valves and on the opposite side of the cylinder center axis with the center axis of the intake and exhaust valves as a boundary, and these intake and exhaust camshafts and the Suction and exhaust rocker arms for transmitting the valve opening force of each camshaft to each valve are interposed between the intake and exhaust valves, and the base ends of these suction and exhaust rocker arms are swingably supported. Since the support shafts are placed on the opposite sides of the center axes of the intake and exhaust valves, with the contact points between the rocker arms and the intake and exhaust camshafts as boundaries, the intake and exhaust camshafts are connected to the intake and exhaust valves, respectively. The two engine blocks can be arranged close to each other, the head of each engine block can be made smaller, and a sufficiently wide V-shaped space can be secured between the two engine blocks. The degree of freedom in mounting the device group in the V-shaped space can be increased. Moreover, by locating the intake and exhaust camshafts on the outside of the center axes of the intake and exhaust valves, a wide working space can be obtained between the two camshafts, which, together with the adoption of a rocker arm for intake and exhaust, makes it possible to reduce the distance between each valve. Adjustment work can be done easily.
さらに、前記第１、第２エンジンブロツクの、
前記Ｖ字状空間を挟んで相対向する気筒を、その
両気筒相互がクランク軸の軸線方向に所定量オフ
セツトするよう配置し、該相対向する気筒の吸気
ポートにそれぞれ接続される一対の気化器を、そ
の両気化器相互が該Ｖ字状空間内においてクラン
ク軸の軸線方向に所定量オフセツトするよう配設
すると共に、該一対の気化器の、上流端に吸入口
を有する筒状入口管を、その両入口管相互がクラ
ンク軸の軸線方向に近接し且つＸ字状に交差する
よう配置したので、第１、第２エンジンブロツク
の、前記Ｖ字状空間を挟んで相対向する気筒相互
の前記オフセツト配置による効果と、前述のよう
に各エンジンブロツクの頭部の小型化達成により
前記Ｖ字状空間を広く確保できて該空間における
各気化器の取付け自由度が増加する効果とが相俟
つて、該Ｖ字状空間における前記一対の気化器の
オフセツト配置を無理なく行うことができる。し
かもそのオフセツト配置された一対の気化器の入
口管相互をクランク軸方向に近接させてＸ字状に
交差配置させたことにより、該一対の気化器の気
化器本体相互の干渉を回避しつつその両気化器本
体間のクランク軸軸線方向の間隔を詰めることが
できて、前記Ｖ字状空間において気化器群を全体
としてクランク軸軸線方向にコンパクトに収める
ことができ、その上、上記入口管のＸ字状の交差
配置により、上記一対の気化器の吸入口を相異な
る方向に開口させることができるから、該一対の
気化器相互を近接配置するも両気化器間の吸気干
渉を容易に回避することができる。 Furthermore, the first and second engine blocks,
A pair of carburetors, wherein the cylinders facing each other with the V-shaped space in between are arranged so that the cylinders are offset by a predetermined amount from each other in the axial direction of the crankshaft, and each of the cylinders is connected to the intake ports of the cylinders facing each other. are arranged so that the two carburetors are offset by a predetermined amount from each other in the axial direction of the crankshaft within the V-shaped space, and a cylindrical inlet pipe having an inlet at the upstream end of the pair of carburetors is provided. The inlet pipes are arranged so that they are close to each other in the axial direction of the crankshaft and intersect in an X-shape, so that the cylinders of the first and second engine blocks that face each other across the V-shaped space The effect of the offset arrangement is combined with the effect that the head of each engine block is made smaller as described above, so that the V-shaped space can be secured widely and the degree of freedom in mounting each carburetor in this space is increased. Therefore, the pair of vaporizers can be arranged offset in the V-shaped space without difficulty. Moreover, by bringing the inlet pipes of the pair of offset-arranged carburetors close to each other in the direction of the crankshaft and arranging them in an X-shape, interference between the carburetor bodies of the pair of carburetors can be avoided. The distance between the two carburetor bodies in the crankshaft axial direction can be reduced, and the carburetor group as a whole can be compactly housed in the crankshaft axial direction in the V-shaped space. Due to the X-shaped cross arrangement, the intake ports of the pair of carburetors can be opened in different directions, so even if the pair of carburetors are disposed close to each other, intake interference between the two carburetors can be easily avoided. can do.
第１図は本発明の一実施例を示すＶ型内燃機関
の側面図、第２図及び第３図は第１図の−及
び−線拡大断面図、第４図は同機関の第１エ
ンジンブロツク側動弁機構のヘツドカバーを外し
た状態での要部平面図、第５及び第６図は第４図
の−及び−線断面図である。
Ａ……排気弁の中心軸線、Ｂ……吸気弁の中心
軸線、Ｃ……気筒の中心軸線、Ｅ……内燃機関、
e1，e2……吸入口、２……クランク軸、３1，３2
……第１、第２エンジンブロツク、４1，４2……
気筒、６1，６2……吸気弁、７1，７2……排気
弁、８1，８2……吸気ポート、９1，９2……気化
器、９a1，９a2……入口管、１０……Ｖ字状空
間、１１1，１１2……排気ポート、１７……吸気
用カム軸、１８……排気用カム軸、２１……吸気
用ロツカアーム、２２……排気用ロツカアーム、
２３，２４……支軸。
FIG. 1 is a side view of a V-type internal combustion engine showing an embodiment of the present invention, FIGS. 2 and 3 are enlarged sectional views taken along lines - and - in FIG. 1, and FIG. 4 is a first engine of the same engine. FIGS. 5 and 6 are a plan view of the main parts of the block side valve mechanism with the head cover removed, and are sectional views taken along lines - and - in FIG. 4. A...Central axis of exhaust valve, B...Central axis of intake valve, C...Cylinder center axis, E...Internal combustion engine,
e 1 , e 2 ... Suction port, 2 ... Crankshaft, 3 1 , 3 2
...First and second engine blocks, 4 1 , 4 2 ...
Cylinder, 6 1 , 6 2 ... Intake valve, 7 1 , 7 2 ... Exhaust valve, 8 1 , 8 2 ... Intake port, 9 1 , 9 2 ... Carburetor, 9a 1 , 9a 2 ... Inlet Pipe, 10... V-shaped space, 11 1 , 11 2 ... Exhaust port, 17... Intake camshaft, 18... Exhaust camshaft, 21... Intake rocker arm, 22... Exhaust rocker arm,
23, 24... Support shaft.
Claims (1)
ロツクを、その両エンジンブロツク間にＶ字状空
間が形成されるようＶ字状に配置し、そのＶ字状
空間を挟んで相対向する、第１、第２エンジンエ
ンジンブロツクの気筒相互をクランク軸の軸線方
向に所定量オフセツトして配置すると共に、該第
１、第２エンジンブロツクの、前記Ｖ字状空間を
挟んで相対向する内側面に前記各気筒の吸気ポー
トを、またそれらの外側面に同排気ポートをそれ
ぞれ開口し、これら吸、排気ポートを開閉する
吸、排気弁の上方、且つこれら吸、排気弁の中心
軸線を境として前記気筒の中心軸線と反対側に一
対の吸、排気用カム軸を配置し、これら吸、排気
用カム軸と前記吸、排気弁との各間に、各カム軸
の開弁力を各弁に伝達する吸、排気用ロツカアー
ムをそれぞれ介装すると共に、それら吸、排気用
ロツカアームの基端を揺動自在に支持する支軸を
これらロツカアームと吸、排気用カム軸との各接
触点を境として前記吸、排気弁の中心軸線と反対
側にそれぞれ配置し、さらに前記第１、第２エン
ジンブロツクの、前記Ｖ字状空間を挟んで相対向
する気筒の吸気ポートにそれぞれ接続される一対
の気化器を、その両気化器相互が該Ｖ字状空間内
においてクランク軸の軸線方向に所定量オフセツ
トするよう配設すると共に、該一対の気化器の、
上流端に吸入口を有する筒状入口管を、その両入
口管相互がクランク軸の軸線方向に近接し且つＸ
字状に交差するよう配置したことを特徴とする、
Ｖ型内燃機関。1. First and second engine blocks, each equipped with a cylinder, are arranged in a V-shape so that a V-shaped space is formed between the two engine blocks, and a second 1. The cylinders of the second engine block are arranged so as to be offset by a predetermined amount from each other in the axial direction of the crankshaft, and on the inner surfaces of the first and second engine blocks facing each other across the V-shaped space. The intake ports of each of the cylinders and the exhaust ports are opened on their outer surfaces, and above the intake and exhaust valves that open and close these intake and exhaust ports, and above the central axes of these intake and exhaust valves. A pair of intake and exhaust camshafts are arranged on the side opposite to the central axis of the cylinder, and between these intake and exhaust camshafts and the intake and exhaust valves, the valve opening force of each camshaft is applied to each valve. Suction and exhaust rocker arms for transmission are interposed, and support shafts that swingably support the base ends of these suction and exhaust rocker arms are arranged at the contact points between these rocker arms and the suction and exhaust camshafts as boundaries. a pair of carburetors disposed on opposite sides of the central axes of the intake and exhaust valves, and further connected to intake ports of cylinders of the first and second engine blocks that face each other across the V-shaped space; The pair of carburetors are arranged so that the two carburetors are offset by a predetermined amount in the axial direction of the crankshaft within the V-shaped space, and
A cylindrical inlet pipe having a suction port at the upstream end is arranged such that both inlet pipes are close to each other in the axial direction of the crankshaft and
It is characterized by being arranged so as to intersect in a character shape.
V-type internal combustion engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14818781A JPS5851207A (en) | 1981-09-19 | 1981-09-19 | V-type internal-combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14818781A JPS5851207A (en) | 1981-09-19 | 1981-09-19 | V-type internal-combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5851207A JPS5851207A (en) | 1983-03-25 |
| JPH0159404B2 true JPH0159404B2 (en) | 1989-12-18 |
Family
ID=15447183
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14818781A Granted JPS5851207A (en) | 1981-09-19 | 1981-09-19 | V-type internal-combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5851207A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03127514U (en) * | 1990-04-06 | 1991-12-24 |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56120955A (en) * | 1980-02-29 | 1981-09-22 | Japan Atom Energy Res Inst | Measuring device by using pitot tube |
| JPS58167871A (en) * | 1982-03-30 | 1983-10-04 | Yamaha Motor Co Ltd | V-type engine |
| JPS6039707U (en) * | 1983-08-29 | 1985-03-19 | スズキ株式会社 | V-type engine valve train |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5335813A (en) * | 1976-09-13 | 1978-04-03 | Kubota Ltd | V-shaped air-cooled four stroke engine |
-
1981
- 1981-09-19 JP JP14818781A patent/JPS5851207A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5335813A (en) * | 1976-09-13 | 1978-04-03 | Kubota Ltd | V-shaped air-cooled four stroke engine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03127514U (en) * | 1990-04-06 | 1991-12-24 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5851207A (en) | 1983-03-25 |
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