JPS642780B2 - - Google Patents
Info
- Publication number
- JPS642780B2 JPS642780B2 JP17433881A JP17433881A JPS642780B2 JP S642780 B2 JPS642780 B2 JP S642780B2 JP 17433881 A JP17433881 A JP 17433881A JP 17433881 A JP17433881 A JP 17433881A JP S642780 B2 JPS642780 B2 JP S642780B2
- Authority
- JP
- Japan
- Prior art keywords
- crankshaft
- crankcase half
- cylinder
- opening
- cylinder block
- 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
- 230000007246 mechanism Effects 0.000 description 8
- 238000003754 machining Methods 0.000 description 7
- 238000001816 cooling Methods 0.000 description 3
- 238000012805 post-processing Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 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
- F02B75/00—Other engines
- F02B75/007—Other engines having vertical crankshafts
-
- 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
- F02F1/002—Integrally formed cylinders and cylinder heads
-
- 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
- F02F1/26—Cylinder heads having cooling means
- F02F1/28—Cylinder heads having cooling means for air cooling
- F02F1/30—Finned cylinder heads
- F02F1/305—Finned cylinder heads the cylinder heads being of side valve type
-
- 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
- F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
- F02B2275/34—Lateral camshaft position
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/02—Light metals
- F05C2201/021—Aluminium
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、垂直置きのクランクシヤフトを下部
で片持ち支持する４サイクルエンジンに関し、特
に後加工の容易化と組立性の向上を図るとともに
エンジン高の低下も図れるようにした４サイクル
エンジンに関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a four-stroke engine in which a vertically placed crankshaft is cantilever-supported at the bottom, and in particular aims to facilitate post-processing and improve assembly. This relates to a four-stroke engine that can also reduce the engine height.
クランクシヤフトを垂直置きとした２サイクル
エンジンにおいて、シリンダブロツク部と一体の
クランクケース半体部に形成したシリンダセンタ
及びクランクシヤフトセンタに対し斜めの開口部
を別体のクランクケース半体で閉塞する構造は特
開昭54−27615号公報にて公知である。このよう
にシリンダブロツク部と一体のクランクケース半
体部の開口部がシリンダセンタ及びクランクシヤ
フトセンタに対し斜めに形成されているため、シ
リンダボアやクランクケース半体部の軸受部に対
する機械加工が容易に行え、ピストン、コンロツ
ド及びクランクシヤフトの組付けも容易に行え
る。
In a two-stroke engine with a vertical crankshaft, a structure in which the cylinder center formed in the crankcase half integrated with the cylinder block and the opening oblique to the crankshaft center are closed with a separate crankcase half. is known from Japanese Patent Application Laid-Open No. 54-27615. Since the opening of the crankcase half that is integrated with the cylinder block is formed at an angle to the cylinder center and crankshaft center, machining of the cylinder bore and the bearing of the crankcase half is easy. The piston, connecting rod and crankshaft can be easily assembled.
尚、このものはクランクシヤフトを上下部で両
持ち支持することから別体のクランクケース半体
にも軸受部を機械加工するものとなつている。 In this case, since the crankshaft is supported on both sides at the top and bottom, bearings are also machined on the separate crankcase half.
ところで、垂直置きのクランクシヤフトを下部
で片持ち支持する構造にすれば、別体のクランク
ケース半体への軸受部の機械加工が不要となり、
組立性も向上する。
By the way, if the vertical crankshaft is cantilever-supported at the bottom, there will be no need to machine the bearing part of the separate crankcase half.
Ease of assembly is also improved.
また２サイクルエンジンとは異なり動弁機構を
有する４サイクルエンジンにおいて、垂直置きの
クランクシヤフトを下部で片持ち支持する場合、
オーバーヘツドバルブ方式やサイドバルブ方式に
よる動弁機構を必要とする。 Also, unlike a 2-stroke engine, in a 4-stroke engine that has a valve mechanism, when the vertically placed crankshaft is cantilevered at the bottom,
A valve mechanism using an overhead valve method or a side valve method is required.
そしてクランクケース内にカムシヤフトをクラ
ンクシヤフトと平行に設ける場合、ロツカーアー
ムとカムシヤフト間のプツシユロツドがシリンダ
ブロツク部の側方に配置されることから吸気系と
排気系を上下に分割する必要があり、これにより
シリンダブロツク部上方に吸排気系の一方が位置
してエンジン高が高くなつてしまう。 When the camshaft is installed parallel to the crankshaft inside the crankcase, the push rod between the rocker arm and the camshaft is placed on the side of the cylinder block, so it is necessary to divide the intake system and exhaust system into upper and lower parts. One side of the intake and exhaust system is located above the cylinder block, which increases the height of the engine.
そこで本発明の目的は、垂直置きのクランクシ
ヤフトを下部で片持ち支持する４サイクルエンジ
ンであつて、クランクケース部の開口部形状に工
夫を施して特に後加工の容易化と組立性の向上を
達成できるとともに、カムシヤフトとプツシユロ
ツドハウジングの配置に工夫を施すことによりエ
ンジン高の低下も達成できるようにした４サイク
ルエンジンを提供することにある。 SUMMARY OF THE INVENTION An object of the present invention is to provide a four-stroke engine in which a vertically placed crankshaft is cantilever-supported at the bottom, and in which the shape of the opening of the crankcase is devised to facilitate post-processing and improve assembly. It is an object of the present invention to provide a four-cycle engine which can achieve the above-mentioned results and also achieve a reduction in engine height by devising the arrangement of a camshaft and a push rod housing.
以上の課題を達成すべく本発明は、垂直置きの
クランクシヤフト３４を下部で片持ち支持する４
サイクルエンジンにおいて、シリンダブロツク部
３とクランクケース半体部４とを一体成形し、ク
ランクケース半体部４にはクランクシヤフト３４
下部に対する上下の軸受部１０，１１を形成する
とともに、該上下の軸受部１０，１１間にカムシ
ヤフト４５をクランクシヤフト３４に対し直交配
置し、またクランクケース半体部４にシリンダセ
ンタＮ−Ｎ及びクランクシヤフトセンタN1−N1
に対し斜めの開口部９を形成し、且つ該開口部９
を閉塞するクランクケース半体２１を設け、更に
シリンダブロツク部３の下部にはプツシユロツド
ハウジング６を一体成形したことを特徴とする。
In order to achieve the above-mentioned problems, the present invention provides a four-wheel drive system that cantilever-supports a vertically placed crankshaft 34 at the bottom.
In a cycle engine, the cylinder block part 3 and the crankcase half part 4 are integrally molded, and the crankshaft 34 is attached to the crankcase half part 4.
Upper and lower bearing parts 10 and 11 are formed with respect to the lower part, and a camshaft 45 is disposed orthogonally to the crankshaft 34 between the upper and lower bearing parts 10 and 11, and a cylinder center N-N and a cylinder center are formed in the crankcase half part 4. Crankshaft center N 1 −N 1
forming an opening 9 oblique to the opening 9;
A crankcase half body 21 is provided to close the cylinder block part 3, and a push rod housing 6 is integrally molded at the lower part of the cylinder block part 3.
垂直置きのクランクシヤフト３４を下部で片持
ち支持する４サイクルエンジンであり、シリンダ
ブロツク部３と一体のクランクケース半体部４に
クランクシヤフト３４下部に対する上下の軸受部
１０，１１とシリンダセンタＮ−Ｎ及びクランク
シヤフトセンタN1−N1に対し斜めの開口部９を
形成し、該開口部９を閉塞するクランクケース半
体２１を設けたので、クランクケース半体２１の
軸受部の機械加工が不要となり、シリンダボア３
ｂやクランクケース半体部４の各軸受部１０，１
１等に対する機械加工だけにして後加工の容易化
が図れるとともに、ピストン３１、コンロツド３
２及びクランクシヤフト３４の組付けを容易にし
て組立性のより一層の向上をも図れる。
This is a 4-cycle engine in which a vertically placed crankshaft 34 is cantilever-supported at the bottom, and a crankcase half 4 integrated with a cylinder block 3 has upper and lower bearings 10, 11 for the lower part of the crankshaft 34 and a cylinder center N-. Since an oblique opening 9 is formed with respect to N and the crankshaft center N 1 -N 1 and a crankcase half 21 is provided to close the opening 9, machining of the bearing portion of the crankcase half 21 is easy. No longer needed, cylinder bore 3
b and each bearing part 10, 1 of the crankcase half body part 4.
Post-processing can be simplified by only machining the first part, and the piston 31 and connecting rod 3 can be easily machined.
2 and the crankshaft 34, thereby further improving the assemblability.
そしてクランクケース半体部４の上下の軸受部
１０，１１間にカムシヤフト４５をクランクシヤ
フト３４に対し直交配置し、シリンダブロツク部
３の下部にはプツシユロツドハウジング６を一体
成形しているので、確実に動弁機構を作動できる
とともに、吸排気系を左右に分割してエンジン高
の低下が図れる。 A camshaft 45 is disposed perpendicularly to the crankshaft 34 between the upper and lower bearings 10 and 11 of the crankcase half 4, and a push rod housing 6 is integrally molded at the bottom of the cylinder block 3. In addition to being able to operate the valve mechanism reliably, the engine height can be lowered by dividing the intake and exhaust system into left and right sides.
以下に添付図面を基に実施例を説明する。 Examples will be described below based on the accompanying drawings.
本発明に係る４サイクルエンジンの縦断側面を
示す第１図から内部機構を取り除いて分解して示
した第２図において、１はメインブロツク、２１
はクランクケース半体である。 In FIG. 2, which is an exploded view of the four-cycle engine according to the present invention with the internal mechanism removed from FIG.
is half of the crankcase.
メインブロツク１はシリンダヘツド部２とシリ
ンダブロツク部３とクランクケース半体部４とが
一体成形された鋳造品であり、シリンダヘツド部
２及びシリンダブロツク部３の外周に冷却フイン
５…が備えられる。シリンダヘツド部２及びシリ
ンダブロツク部３の下部にはプツシユロツドハウ
ジング６が一体に成形されており、このプツシユ
ロツドハウジング６はクランクケース半体部４の
軸受用胴部４ａ内に壁部４ｂから連通し、６ａは
プツシユロツドハウジング内通路である。この通
路６ａはシリンダヘツド部２の先端外周に形成し
たカバー取付部７内方に開放され、８は支持部で
あり、プツシユロツドハウジング６の外周上部６
ｂに冷却フイン５…の下部５ａが連続して一体化
され、これにより強度アツプが図られている。 The main block 1 is a cast product in which a cylinder head portion 2, a cylinder block portion 3, and a crankcase half portion 4 are integrally molded, and cooling fins 5 are provided on the outer peripheries of the cylinder head portion 2 and cylinder block portion 3. . A push rod housing 6 is integrally molded at the lower part of the cylinder head portion 2 and the cylinder block portion 3, and this push rod housing 6 is attached to a wall within the bearing body 4a of the crankcase half body 4. It communicates with the portion 4b, and 6a is a passage within the push rod housing. This passage 6a is open inward to a cover mounting part 7 formed on the outer periphery of the tip of the cylinder head part 2, and 8 is a support part, which is attached to the upper part 6 of the outer periphery of the push rod housing 6.
The lower portions 5a of the cooling fins 5 are continuously integrated with the cooling fins 5, thereby increasing the strength.
そしてクランクケース半体部４にはシリンダセ
ンタＮ−ＮとクランクシヤフトセンタN1−N1に
対し斜め直線状の開口部９が形成されている。こ
の開口部９の開口縁９ａは上端９ｂがシリンダブ
ロツク部３の基部外周の上部３ａに連続し、且つ
クランクケース半体部４の外周延出部４ｃ上に連
続する開口縁下端９ｃはシリンダブロツク部３の
シリンダボア３ｂの最下位の延長線N2よりも下
方に位置している。更にクランクケース半体部４
の軸受用胴部４ａの内周４ｄには上下の軸受部１
０，１１が形成されており、またシリンダヘツド
部２の先端には点火プラグ取付孔１２、燃焼室天
井部２ａから左右の各吸排気弁孔１３及び弁杆挿
通孔１３ａと、支持穴１４が夫々形成されてい
る。 In the crankcase half 4, an opening 9 is formed which is obliquely linear with respect to the cylinder center N-N and the crankshaft center N1 - N1 . The upper end 9b of the opening edge 9a of the opening 9 is continuous with the upper part 3a of the outer periphery of the base of the cylinder block part 3, and the lower end 9c of the opening edge 9c is continuous with the outer periphery extension part 4c of the crankcase half part 4. It is located below the lowest extension line N2 of the cylinder bore 3b of the portion 3. Furthermore, the crankcase half body part 4
Upper and lower bearing parts 1 are provided on the inner periphery 4d of the bearing body 4a.
0 and 11 are formed at the tip of the cylinder head 2, and a spark plug mounting hole 12, intake and exhaust valve holes 13 on the left and right from the combustion chamber ceiling 2a, a valve rod insertion hole 13a, and a support hole 14 are formed at the tip of the cylinder head 2. are formed respectively.
以上の鋳造品であるメインブロツク１は、シリ
ンダヘツド部２の各孔１２，１３，１３ａと燃焼
室天井部２ａの機械加工及びシリンダブロツク部
３のシリンダボア３ｂの機械加工を開口部９から
支障なく容易に行えるとともに、クランクケース
半体部４の軸受部１０，１１の機械加工も開口部
９から支障なく容易に行える。 The main block 1, which is a cast product as described above, allows machining of the holes 12, 13, 13a of the cylinder head 2, the combustion chamber ceiling 2a, and the cylinder bore 3b of the cylinder block 3 from the opening 9 without any trouble. In addition, machining of the bearing parts 10 and 11 of the crankcase half body 4 can be easily performed from the opening 9 without any trouble.
次に別体のクランクケース半体２１は帽状をな
して開口部２２が前記開口縁９ａと対応する斜め
の開口縁２２ａを有しており、このクランクケー
ス半体２１は鋼板素材のプレス成形品またはアル
ミニウム合金や合成樹脂で成形されている。この
クランクケース半体２１の開口縁２２ａをメイン
ブロツク１の開口縁９ａに対しパツキン等を介装
して重ね合わせ、ボルト等で両者を締結接合する
ようになつている。 Next, the separate crankcase half 21 is shaped like a cap and has an opening 22 with an oblique opening edge 22a corresponding to the opening edge 9a, and this crankcase half 21 is press-formed from a steel plate material. or molded from aluminum alloy or synthetic resin. The opening edge 22a of the crankcase half 21 is overlapped with the opening edge 9a of the main block 1 with a gasket or the like interposed therebetween, and the two are fastened together using bolts or the like.
これに先立ち第１図のようにメインブロツク１
に内部機構を組み込む。３１はピストン、３２は
コンロツド、３４はクランクシヤフトであり、ピ
ストン３１にコンロツド３２の小端部３２ａをピ
ストンピン３３で連結しておく一方、垂直置きで
下部片持ち式のクランクシヤフト３４のクランク
ウエブ３４ａ下方に備えた上下のジヤーナル部３
４ｂ，３４ｃをクランクケース半体部４内の各軸
受部１０，１１に夫々の軸受３６，３５を介装し
て組み付ける。そしてクランクウエブ３４ａ上の
クランクピン部３４ｄにコンロツド大端部３２ｂ
の孔部３２ｃを嵌合し、その上面にストツパ３７
を当ててボルト３８で抜け止め結合して、ピスト
ン３１をシリンダブロツク部３内のシリンダボア
３ｂに挿入する。またシリンダヘツド部２の取付
孔１２に点火プラグ３９を螺着し、弁孔１３に予
め夫々挿着しておいた吸排気弁４０の一方の弁杆
４０ａは各挿通孔１３ａから突出しており、支持
穴１４に螺着した支持部材４１に支持したロツカ
ーアーム４２の上端を弁杆４０ａに係合する。こ
のロツカーアーム４２の下端に係合させてプツシ
ユロツド４３をシリンダブロツク部３の下部のハ
ウジング６内の通路６ａに通す。ここで、クラン
クシヤフト３４のジヤーナル部３４ｂ，３４ｃ
（上下の軸受部１０，１１）間に形成された駆動
ギヤ４４に直交噛合する被動ギヤ４６を形成した
カムシヤフト４５がクランクケース半体部４内に
おいてクランクシヤフト３４と直交して配置され
ており、このカムシヤフト４５のカム部４５ａに
はプツシユロツド４３がバルブリフタ４７を介し
係合している。これにより動弁機構が構成され、
またシリンダヘツド部２の先端外周の取付部７に
シリンダヘツドカバー４８がパツキン等を介装し
てボルト等で締結接合されている。 Prior to this, as shown in Figure 1, main block 1
Incorporate internal mechanisms into. 31 is a piston, 32 is a connecting rod, and 34 is a crankshaft. The small end 32a of the connecting rod 32 is connected to the piston 31 by a piston pin 33, and the crank web of the crankshaft 34 is vertically placed and cantilevered at the bottom. Upper and lower journal parts 3 provided below 34a
4b and 34c are assembled to the respective bearing portions 10 and 11 in the crankcase half body 4 by interposing the respective bearings 36 and 35. Then, connect the connecting rod large end 32b to the crank pin portion 34d on the crank web 34a.
the hole 32c, and a stopper 37 on the top surface of the hole 32c.
The piston 31 is inserted into the cylinder bore 3b in the cylinder block portion 3 by attaching the piston 31 to the cylinder bore 3b in the cylinder block portion 3. Further, an ignition plug 39 is screwed into the mounting hole 12 of the cylinder head portion 2, and one valve rod 40a of the intake and exhaust valves 40, which have been inserted into the respective valve holes 13 in advance, protrudes from each insertion hole 13a. The upper end of the rocker arm 42 supported by the support member 41 screwed into the support hole 14 is engaged with the valve rod 40a. The push rod 43 is engaged with the lower end of the rocker arm 42 and passed through the passage 6a in the housing 6 at the lower part of the cylinder block portion 3. Here, the journal parts 34b and 34c of the crankshaft 34
A camshaft 45 formed with a driven gear 46 orthogonally meshing with a driving gear 44 formed between (the upper and lower bearing parts 10, 11) is disposed within the crankcase half 4 so as to be perpendicular to the crankshaft 34, A push rod 43 is engaged with a cam portion 45a of the camshaft 45 via a valve lifter 47. This constitutes a valve train,
Further, a cylinder head cover 48 is fastened to the mounting portion 7 on the outer periphery of the tip of the cylinder head portion 2 using a bolt or the like with a packing or the like interposed therebetween.
尚、実施例では動弁機構をオーバーヘツドバル
ブ方式としたが、サイドバルブ方式にも適用でき
る。またシリンダヘツド部については別体であつ
ても良い。 In the embodiment, the valve mechanism is an overhead valve type, but it can also be applied to a side valve type. Further, the cylinder head portion may be a separate body.
以上のように本発明によれば、垂直置きのクラ
ンクシヤフトを下部で片持ち支持する４サイクル
エンジンにおいて、シリンダブロツク部と一体の
クランクケース半体部にクランクシヤフト下部に
対する上下の軸受部とシリンダセンタ及びクラン
クシヤフトセンタに対し斜めの開口部を形成し、
該開口部を閉塞するクランクケース半体を設けた
構造のため、クランクケース半体の軸受部の機械
加工を不要にし、シリンダボアやクランクケース
半体部の各軸受部等に対する機械加工だけにして
後加工の容易化を達成することができるととも
に、ピストン、コンロツド及びクランクシヤフト
の組付けを容易にして組立性のより一層の向上を
も達成することができる。
As described above, according to the present invention, in a four-stroke engine in which a vertically placed crankshaft is cantilever-supported at the lower part, the upper and lower bearing parts for the lower part of the crankshaft and the cylinder center are attached to the crankcase half part that is integrated with the cylinder block part. and forming an opening diagonal to the crankshaft center,
Since the structure includes a crankcase half that closes the opening, machining of the bearing part of the crankcase half is unnecessary, and only the cylinder bore and each bearing part of the crankcase half can be machined. Not only can machining be facilitated, but also the piston, connecting rod and crankshaft can be easily assembled, thereby further improving assemblability.
そしてクランクケース半体部の上下の軸受部間
にカムシヤフトとクランクシヤフトに対し直交配
置したことで、確実に動弁機構を作動できるとと
もに、更にシリンダブロツク部の下部にプツシユ
ロツドハウジングを一体成形した構造のため、吸
排気系を左右に分割してエンジン高の低下を達成
することができる。 By arranging the camshaft and the crankshaft orthogonally between the upper and lower bearings of the crankcase half, the valve mechanism can be operated reliably, and the push rod housing is integrally molded at the bottom of the cylinder block. Because of this structure, the engine height can be lowered by dividing the intake and exhaust system into left and right sides.
第１図は本発明に係る４サイクルエンジンの縦
断側面図、第２図は内部機構を取り除いた分解図
である。
尚、図面中、３はシリンダブロツク部、Ｎ−Ｎ
はシリンダセンタ、４はクランクケース半体部、
６はプツシユロツドハウジング、９は開口部、１
０，１１は軸受部、２１はクランクケース半体、
３４はクランクシヤフト、N1−N1はクランクシ
ヤフトセンタ、４３はプツシユロツド、４５はカ
ムシヤフトである。
FIG. 1 is a longitudinal sectional side view of a four-stroke engine according to the present invention, and FIG. 2 is an exploded view with internal mechanisms removed. In addition, in the drawing, 3 is the cylinder block part, N-N
is the cylinder center, 4 is the crankcase half,
6 is a push rod housing, 9 is an opening, 1
0 and 11 are the bearings, 21 is the crankcase half,
34 is a crankshaft, N1 - N1 is a crankshaft center, 43 is a push rod, and 45 is a camshaft.
Claims (1)
支持する４サイクルエンジンにおいて、 シリンダブロツク部とクランクケース半体部と
を一体成形し、 クランクケース半体部にはクランクシヤフト下
部に対する上下の軸受部を形成するとともに、 該上下の軸受部間にカムシヤフトをクランクシ
ヤフトに対し直交配置し、 またクランクケース半体部にシリンダセンタ及
びクランクシヤフトセンタに対し斜めの開口部を
形成し、 且つ該開口部を閉塞するクランクケース半体を
設け、 更にシリンダブロツク部の下部にはプツシユロ
ツドハウジングを一体成形したことを特徴とする
４サイクルエンジン。[Claims] 1. In a four-stroke engine in which a vertically placed crankshaft is cantilever-supported at the bottom, a cylinder block portion and a crankcase half body are integrally molded, and the crankcase half body has a structure that is attached to the bottom of the crankshaft. forming upper and lower bearing parts, arranging a camshaft orthogonally to the crankshaft between the upper and lower bearing parts, and forming an opening in the crankcase half that is diagonal to the cylinder center and the crankshaft center, and A four-cycle engine characterized in that a crankcase half is provided to close the opening, and a pushrod housing is integrally molded at the lower part of the cylinder block.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17433881A JPS5874856A (en) | 1981-10-29 | 1981-10-29 | Internal-combustion engine |
| US06/423,260 US4513702A (en) | 1981-10-13 | 1982-09-24 | Internal combustion engine |
| FR8218103A FR2515729B1 (en) | 1981-10-13 | 1982-10-28 | INTERNAL COMBUSTION ENGINE COMPRISING A MOTOR BLOCK AND A HALF-CRANKCASE FORMED FROM A SINGLE PART |
| DE19823240237 DE3240237A1 (en) | 1981-10-13 | 1982-10-29 | FOUR-STOCK COMBUSTION ENGINE |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17433881A JPS5874856A (en) | 1981-10-29 | 1981-10-29 | Internal-combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5874856A JPS5874856A (en) | 1983-05-06 |
| JPS642780B2 true JPS642780B2 (en) | 1989-01-18 |
Family
ID=15976885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17433881A Granted JPS5874856A (en) | 1981-10-13 | 1981-10-29 | Internal-combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5874856A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07116987B2 (en) * | 1983-11-08 | 1995-12-18 | ヤマハ発動機株式会社 | Engine for heat pump device |
| JPS63158564U (en) * | 1987-04-03 | 1988-10-18 | ||
| JP2698247B2 (en) * | 1991-08-09 | 1998-01-19 | 三洋電機株式会社 | Dryer |
| WO2019187091A1 (en) | 2018-03-30 | 2019-10-03 | 本田技研工業株式会社 | Engine |
-
1981
- 1981-10-29 JP JP17433881A patent/JPS5874856A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5874856A (en) | 1983-05-06 |
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