JPS6347884B2 - - Google Patents
Info
- Publication number
- JPS6347884B2 JPS6347884B2 JP16182282A JP16182282A JPS6347884B2 JP S6347884 B2 JPS6347884 B2 JP S6347884B2 JP 16182282 A JP16182282 A JP 16182282A JP 16182282 A JP16182282 A JP 16182282A JP S6347884 B2 JPS6347884 B2 JP S6347884B2
- Authority
- JP
- Japan
- Prior art keywords
- oil tank
- tank chamber
- crankshaft
- cooling fan
- outside air
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P1/00—Air cooling
- F01P1/06—Arrangements for cooling other engine or machine parts
-
- 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
- F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
- F02B63/02—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for hand-held tools
-
- 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
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
Description
【発明の詳細な説明】
本発明は、空冷式エンジンの構造に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of an air-cooled engine.
空冷式エンジンにおいて、クランクシヤフトの
出力側に油槽室を設け、該油槽室内においてクラ
ンクシヤフトに連係したエンジンの速度制御用の
ガバナを潤滑するようにしたものがあるが、油槽
室内の潤滑油の温度上昇が問題となつている。特
に、自走式の芝刈機に適用する空冷式エンジンに
おいては、芝刈機の車輪を駆動する補助出力軸と
クランクシヤフトとを減速ギヤを介して連係して
いるが、芝刈機は走行速度が一般に遅く減速ギヤ
の減速比も大きくなることから、減速ギヤを上記
油槽室内に配して潤滑する必要があり、このこと
によつて、油槽室の温度上昇も著しくなつてい
る。 In some air-cooled engines, an oil tank chamber is provided on the output side of the crankshaft, and a governor connected to the crankshaft for controlling the speed of the engine is lubricated in the oil tank chamber, but the temperature of the lubricating oil in the oil tank chamber is Rising is becoming a problem. In particular, in air-cooled engines used in self-propelled lawn mowers, the auxiliary output shaft that drives the lawn mower's wheels is linked to the crankshaft via a reduction gear. Since the reduction ratio of the reduction gear increases slowly, it is necessary to place the reduction gear in the oil tank chamber and lubricate it, and as a result, the temperature of the oil tank chamber increases significantly.
従来、上記油槽室の冷却には、自然放熱を利用
する方式と、冷却フアンによつてシリンダを冷却
した空気を油槽室周辺に導く方式が一般に採用さ
れているが、前者の方式では充分な冷却効果を期
することができず、また、後者の方式でもシリン
ダを経て加熱された空気で油槽室が冷却されるこ
とになるため、冷却が不十分であり、潤滑油の劣
化等を招き易いという不具合があつた。 Conventionally, two methods have been generally used to cool the oil tank chamber: one uses natural heat radiation, and the other uses a cooling fan to guide air that has cooled the cylinders around the oil tank chamber. However, the former method does not provide sufficient cooling. Furthermore, even with the latter method, the oil tank chamber is cooled by air heated through the cylinder, which results in insufficient cooling and is likely to cause deterioration of the lubricating oil. There was a problem.
本発明は、かかる点に鑑み、クランクシヤフト
を片持式として該クランクシヤフトの出力側に油
槽室を、この油槽室よりも出力側に冷却フアンを
配置するとともに、油槽室近傍に外気取入口を設
け、冷却フアンにて上記外気取入口から外気を油
槽室外周へ直接導くことにより、該油槽室の冷却
効果を高め、合わせて重量軽減を図つた空冷式エ
ンジンの構造を提供するものである。 In view of this, the present invention has a cantilevered crankshaft, an oil tank chamber on the output side of the crankshaft, a cooling fan on the output side of the oil tank chamber, and an outside air intake port near the oil tank chamber. The present invention provides an air-cooled engine structure in which the cooling effect of the oil tank chamber is enhanced and the weight is reduced by directly guiding outside air from the outside air intake port to the outer periphery of the oil tank chamber using a cooling fan.
以下、本発明の構成を実施例につき図面に基づ
いて説明する。 DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below based on embodiments with reference to the drawings.
実施例 １
本例は第１図に示し、１は芝刈機で、空冷式エ
ンジン２を備えている。この空冷式エンジン２に
おいて、３はシリンダヘツド、４はシリンダ部、
５はピストン、６はピストン５にコンロツド７で
連結されたクランクシヤフトであり、該クランク
シヤフト６，６′はクランクウエブはコンロツド
７の片側、つまり下方において鉛直方向に配設さ
れた片持式である。Example 1 This example is shown in FIG. 1, where 1 is a lawn mower equipped with an air-cooled engine 2. In this air-cooled engine 2, 3 is a cylinder head, 4 is a cylinder part,
5 is a piston, 6 is a crankshaft connected to the piston 5 by a connecting rod 7, and the crankshafts 6 and 6' are of a cantilever type in which the crank web is vertically disposed on one side of the connecting rod 7, that is, below. be.
８は笠形状のデツキ部材で、空冷式エンジン２
の下部にクランクシヤフト６を中心としてスカー
ト状に取り付けられ、該クランクシヤフト６の下
端に連結したロータリブレード９を内包するよう
に覆つている。このロータリブレード９は、芝や
草を刈り取るカツターとしての機能と、刈り取つ
た芝や草を飛ばすブロアとしての機能とを具有し
ている。 8 is a shade-shaped deck member, which is used for air-cooled engine 2.
The rotary blade 9 is attached to the lower part of the crankshaft 6 in the form of a skirt, and encloses the rotary blade 9 connected to the lower end of the crankshaft 6. The rotary blade 9 has a function as a cutter for cutting grass and grass, and a function as a blower for blowing away the cut grass and grass.
上記クランクシヤフト６の出力側、つまり下部
には、油槽室１１がクランクケース１２に連接又
は一体化して設けられ、該油槽室１１よりも出力
側、つまり、下方に位置して冷却フアン１３がク
ランクシヤフト６に連結されている。さらに、冷
却フアン１３の下方に位置してリコイルスタータ
１４がクランクシヤフト６に係合すべく配設され
ている。 An oil tank chamber 11 is provided on the output side, that is, at the bottom of the crankshaft 6, and is connected to or integrated with the crankcase 12. A cooling fan 13 is located on the output side, that is, below the oil tank chamber 11, and is connected to the crank case 12. It is connected to the shaft 6. Furthermore, a recoil starter 14 is disposed below the cooling fan 13 to engage with the crankshaft 6.
上記油槽室１１では、ドライブギヤ１５がクラ
ンクシヤフト６に連結され、該ドライブギヤ１５
は芝刈機１の車輪を駆動する補助出力軸１６とド
リブンギヤ１７を介して連係されている。また、
ドライブギヤ１５の下面にはガバナウエイト１８
が枢支され、該ガバナウエイト１８はドライブギ
ヤ１５の凹部に取付けられたガバナスリーブ１９
を介して速度制御用ガバナシヤフト２０のアーム
２１に連係されており、かかるガバナ部材および
前記ギヤ部材は油槽室１１の潤滑油２２で潤滑す
るようになされている。 In the oil tank chamber 11, a drive gear 15 is connected to the crankshaft 6.
are linked via an auxiliary output shaft 16 that drives the wheels of the lawn mower 1 and a driven gear 17. Also,
Governor weight 18 is attached to the bottom of the drive gear 15.
is pivotally supported, and the governor weight 18 is attached to a governor sleeve 19 attached to a recess of the drive gear 15.
The governor member and the gear member are connected to an arm 21 of a speed control governor shaft 20 via a lubricating oil 22 in an oil tank chamber 11.
そうして、上記空冷式エンジン２は、シリンダ
ヘツド３およびシリンダ部４を覆う上部カバー２
３から下方に延設した延設部２４が、冷却フアン
１３およびリコイルスタータ１４を下方より覆う
下部カバー２５に接続されている。上部カバー２
３の延設部２４の内側には、該延設部２４と間隙
を存して対峙する導風板２６が設けられ、該導風
板２６と延設部２４とで一端が冷却フアン１３の
側方に開口し、他端がシリンダ部４の外周部に開
口した導風路２７が形成されている。そして、上
記導風板２６よりも油槽室１１側に位置して外気
取入口２８が、また、上部カバー２３の上端には
排気口２９が開設され、これにより、外気導入口
２８から、油槽室１１の外周部、冷却フアン１
３、導風路２７およびエンジン本体の外周を順に
経て排気口２９に至る冷却通路（図中、冷却風の
流れを白抜きの矢符で示す。）が構成されている。
また、油槽室１１は外気導入口２８からの外気が
当る部分に冷却用フイン３０が設けられている。
なお、３１は冷却フアンの上側を覆うカバー、３
２はリコイルスタータ１４のリール、３３はクラ
ンクプーリ、３４は巻戻し用の渦巻バネである。 The air-cooled engine 2 has an upper cover 2 covering the cylinder head 3 and the cylinder section 4.
An extending portion 24 extending downward from the cooling fan 13 and the recoil starter 14 is connected to a lower cover 25 that covers the cooling fan 13 and the recoil starter 14 from below. Upper cover 2
A baffle plate 26 is provided inside the elongated portion 24 of No. 3, and faces the elongated portion 24 with a gap therebetween. An air guide path 27 is formed which is open laterally and whose other end is open at the outer circumferential portion of the cylinder portion 4 . An outside air intake port 28 is located closer to the oil tank chamber 11 than the baffle plate 26, and an exhaust port 29 is provided at the upper end of the upper cover 23. 11, cooling fan 1
3. A cooling passage (in the figure, the flow of the cooling air is indicated by an open arrow) passes through the air guide passage 27 and the outer periphery of the engine body in order and reaches the exhaust port 29.
Further, cooling fins 30 are provided in the oil tank chamber 11 at a portion where the outside air from the outside air inlet 28 is exposed to.
In addition, 31 is a cover that covers the upper side of the cooling fan;
2 is a reel of the recoil starter 14, 33 is a crank pulley, and 34 is a spiral spring for rewinding.
また、上記冷却フアン１３の周縁部には磁石３
５が付設され、一方、下部カバー２５と延設部２
４との接続部には、前記磁石３５に対応するコイ
ル３６が設けられており、磁石３５とコイル３６
とでマグネト機能をもたせるようにしてある。因
に、冷却フアン３０の周縁部にはリングギヤを付
設したり、あるいは、冷却フアン１３にリコイル
スタータ用プーリやブレーキ用ドラムの機能を持
たせることもある。 Further, a magnet 3 is attached to the peripheral edge of the cooling fan 13.
5 is attached, while the lower cover 25 and the extension part 2
4 is provided with a coil 36 corresponding to the magnet 35, and the magnet 35 and the coil 36 are connected to each other.
It is designed to have a magneto function. Incidentally, a ring gear may be attached to the peripheral edge of the cooling fan 30, or the cooling fan 13 may be provided with the function of a recoil starter pulley or a brake drum.
上記構造において、クランクシヤフト６を片持
式としたため、空冷式エンジン２が軽量にかつ小
型となる。また、冷却フアン１３の回転により外
気取入口２８から吸入された外気が油槽室１１の
外周面の冷却用フイン３０に直接当たるため油槽
室１１の冷却を十分に行なうことができる。ま
た、油槽室１１での発熱量はエンジン本体のそれ
に比べて小さいため、油槽室１１を経てエンジン
本体へ送られる外気の温度上昇も少なく、エンジ
ン本体の冷却に大きな支障はない。 In the above structure, since the crankshaft 6 is cantilevered, the air-cooled engine 2 is lightweight and compact. Moreover, since the outside air sucked in from the outside air intake port 28 by the rotation of the cooling fan 13 directly hits the cooling fins 30 on the outer peripheral surface of the oil tank chamber 11, the oil tank chamber 11 can be sufficiently cooled. Further, since the amount of heat generated in the oil tank chamber 11 is smaller than that of the engine body, the temperature rise of the outside air sent to the engine body through the oil tank chamber 11 is also small, and there is no major problem in cooling the engine body.
実施例 ２
本例は第２図に示し、冷却用外気の流れる経路
が実施例１と異なる例である。Example 2 This example is shown in FIG. 2, and is an example in which the path through which the cooling outside air flows is different from that in Example 1.
すなわち、油槽室１１を冷却するための外気取
入口３７は、上部カバー２３の延設部２４に、該
油槽室１１に近接して開設されている。また、上
部カバー２３の上面にはエンジン本体冷却用外気
取入口３８が開設されている。一方、排気口３９
は、前記油槽室冷却用外気取入口３７の反対側の
冷却フアンカバー３１に開設されている。他の構
は実施例１と同様である。 That is, the outside air intake port 37 for cooling the oil tank chamber 11 is provided in the extending portion 24 of the upper cover 23 in the vicinity of the oil tank chamber 11 . Further, an outside air intake port 38 for cooling the engine body is provided on the upper surface of the upper cover 23. On the other hand, the exhaust port 39
is provided in the cooling fan cover 31 on the opposite side of the outside air intake port 37 for cooling the oil tank chamber. The other structure is the same as in the first embodiment.
本例において、油槽室１１は冷却フアン１３の
回転により、延設部２４の外気取入口３７から吸
入された外気が直接当つて冷却される。また、エ
ンジン本体は上部カバー２３の上面の外気取入口
３８から吸入された外気で冷却される。 In this example, the oil tank chamber 11 is cooled by the rotation of the cooling fan 13 and is directly exposed to outside air taken in from the outside air intake port 37 of the extension portion 24 . Further, the engine body is cooled by outside air taken in from the outside air intake port 38 on the upper surface of the upper cover 23.
以上のように、本発明によれば、クランクシヤ
フトを片持構造としてエンジン本体の片側に油槽
室および冷却フアンを設けたため、油槽室近傍に
開設した外気取入口から取り入れた外気を、冷却
フアンにて油槽室に直接当てることが可能とな
り、該油槽室の冷却効果を高めることができると
ともに、上記片持構造により軽量、小型化が図れ
るという優れた効果が得られる。 As described above, according to the present invention, the oil tank chamber and the cooling fan are provided on one side of the engine body with the crankshaft having a cantilevered structure. This makes it possible to directly apply the oil tank chamber to the oil tank chamber, thereby increasing the cooling effect of the oil tank chamber, and the cantilevered structure provides excellent effects such as being lightweight and compact.
図面は本発明の実施態様を例示し、第１図は実
施例１にかかる芝刈機の縦断面図、第２図は実施
例２の要部を示す縦断面図である。
１……芝刈機、２……空冷式エンジン、５……
ピストン、６……クランクシヤフト、７……コン
ロツド、１１……油槽室、１３……冷却フアン、
１８……ガバナウエイト、１９……ガバナスリー
ブ、２０……ガバナシヤフト、２２……潤滑油、
２８，３７……外気取入口、２９，３９……排気
口。
The drawings illustrate embodiments of the present invention, and FIG. 1 is a longitudinal cross-sectional view of a lawn mower according to a first embodiment, and FIG. 2 is a longitudinal cross-sectional view showing essential parts of a second embodiment. 1... Lawn mower, 2... Air-cooled engine, 5...
Piston, 6...Crankshaft, 7...Conrod, 11...Oil tank chamber, 13...Cooling fan,
18... Governor weight, 19... Governor sleeve, 20... Governor shaft, 22... Lubricating oil,
28, 37... Outside air intake, 29, 39... Exhaust port.
Claims (1)
たコンロツドの片側にクランクシヤフトを配して
片持式クランクシヤフト構造とし、該クランクシ
ヤフトの出力側には冷却フアンが設けられ、該ク
ランクシヤフトのクランクウエブと冷却フアンの
間に油槽室を設け、冷却フアンにて外気を油槽室
周辺に導入することを特徴とする空冷式エンジン
の構造。1 The output section of an air-cooled engine has a cantilevered crankshaft structure with a crankshaft placed on one side of a connecting rod connected to a piston, and a cooling fan is provided on the output side of the crankshaft, and the crankshaft's crank web The structure of an air-cooled engine is characterized in that an oil tank chamber is provided between the engine and the cooling fan, and outside air is introduced into the vicinity of the oil tank chamber by the cooling fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16182282A JPS5951122A (en) | 1982-09-16 | 1982-09-16 | Structure of air-cooled type engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16182282A JPS5951122A (en) | 1982-09-16 | 1982-09-16 | Structure of air-cooled type engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5951122A JPS5951122A (en) | 1984-03-24 |
| JPS6347884B2 true JPS6347884B2 (en) | 1988-09-26 |
Family
ID=15742565
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16182282A Granted JPS5951122A (en) | 1982-09-16 | 1982-09-16 | Structure of air-cooled type engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5951122A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03117586A (en) * | 1989-09-29 | 1991-05-20 | Asahi Beer Patsukusu:Kk | Hand device of industrial robot |
-
1982
- 1982-09-16 JP JP16182282A patent/JPS5951122A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03117586A (en) * | 1989-09-29 | 1991-05-20 | Asahi Beer Patsukusu:Kk | Hand device of industrial robot |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5951122A (en) | 1984-03-24 |
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