JP2004116395A

JP2004116395A - engine

Info

Publication number: JP2004116395A
Application number: JP2002280842A
Authority: JP
Inventors: Tomoaki Imamura; 今村　友昭; Masashige Kajiwara; 梶原　正成
Original assignee: Kubota Corp
Current assignee: Kubota Corp
Priority date: 2002-09-26
Filing date: 2002-09-26
Publication date: 2004-04-15
Anticipated expiration: 2022-09-26
Also published as: JP4082973B2

Abstract

【解決手段】オイルレベルゲージのゲージ挿入筒の下端部を、クランクケース下方の潤滑油溜め内に溜まった潤滑油の油面よりも低くし、ゲージ挿入筒内に侵入した潤滑油の油面の高さにより、潤滑油溜め内の潤滑油の油面の高さを検査するようにしたエンジンにおいて、ブリーザ弁９でブリーザ弁上流室１０とブリーザ弁下流通路１１とを区画し、ブリーザ弁上流室１０をクランクケースと連通させ、ブリーザ弁下流通路１１を吸気通路または大気と連通させるに当たり、ブリーザ弁上流室１０とブリーザ弁下流通路１１との間に通気手段１２を設け、この通気手段１２で、ブリーザ弁９の閉弁時にもブリーザ弁上流室１０とブリーザ弁下流通路１１とが連通するようにした。
【効果】エンジン停止直後でも、潤滑油の油面の高さの検査を正確に行うことができる。
【選択図】　　　図１A lower end of a gage insertion cylinder of an oil level gauge is made lower than an oil level of lubrication oil accumulated in a lubrication oil reservoir below a crankcase, so that a lubrication oil level of the lubrication oil that has entered the gage insertion cylinder is reduced. In the engine in which the height of the oil level of the lubricating oil in the lubricating oil reservoir is inspected by the height, the breather valve 9 partitions the breather valve upstream chamber 10 and the breather valve downstream passage 11, and the breather valve upstream chamber 10 is communicated with the crankcase, and when the breather valve downstream passage 11 is communicated with the intake passage or the atmosphere, a ventilation means 12 is provided between the breather valve upstream chamber 10 and the breather valve downstream passage 11, and the ventilation means 12 Even when the breather valve 9 is closed, the breather valve upstream chamber 10 and the breather valve downstream passage 11 communicate with each other.
[Effect] Even immediately after the engine is stopped, the inspection of the lubricating oil level can be accurately performed.
[Selection diagram] Fig. 1

Description

【０００１】
【発明の属する技術分野】
本発明は、エンジンに関する。
【０００２】
【従来の技術】
従来、エンジンとして、オイルレベルゲージのゲージ挿入筒の下端部を、クランクケース下方の潤滑油溜め内に溜めた潤滑油の油面よりも低くし、ゲージ挿入筒内に侵入した潤滑油の油面の高さにより、潤滑油溜め内の潤滑油の油面の高さを検査するようにしたものがある。
しかし、この種のエンジンでは、ブリーザ弁でブリーザ弁上流室とブリーザ弁下流通路とを区画し、ブリーザ弁上流室をクランクケースと連通させ、ブリーザ弁下流通路を吸気通路または大気と連通させるに当たり、ブリーザ弁上流室とブリーザ室下流通路との間に特別な通気手段がなく、ブリーザ弁の閉弁時にはブリーザ弁上流室とブリーザ弁下流通路とが不通となる。
【０００３】
【発明が解決しようとする課題】
上記従来技術には、次の問題がある。
《問題１》　潤滑油の油面の高さの検査が不正確になる。
ブリーザ弁の閉弁時にはブリーザ弁上流室とブリーザ弁下流通路とが不通となるため、エンジン停止後は、クランクケース内の温度が下がることにより、クランクケースの内圧が大気圧以下の負圧となり、所定時間は、この負圧状態が維持される。このため、この時期に潤滑油の油面の高さの検査を行うと、ゲージ挿入筒内の潤滑油の油面の高さが潤滑油溜めの油面の高さよりも低くなっており、潤滑油の油面の高さの検査が不正確になる。
【０００４】
《問題２》　潤滑油の油面の高さの検査時期が制限される。
上記問題１を解決するためには、エンジン運転停止後、シールの隙間等から侵入する外気により、クランクケースの内圧が大気圧になった後に、潤滑油の油面の高さの検査を行えばよい。しかし、この場合には、エンジン運転停止後、相当時間を待たねばならず、潤滑油の油面の高さの検査時期が制限される。
【０００５】
本発明の課題は、上記問題点を解決できるエンジンを提供することにある。
【０００６】
【課題を解決するための手段】
（請求項１の発明）
図２（Ｂ）に示すように、オイルレベルゲージ（１）のゲージ挿入筒（２）の下端部（３）を、クランクケース（４）下方の潤滑油溜め（５）内に溜まった潤滑油（６）の油面（７）よりも低くし、ゲージ挿入筒（２）内に侵入した潤滑油（６）の油面（８）の高さにより、潤滑油溜め（５）内の潤滑油（６）の油面（７）の高さを検査するようにしたエンジンにおいて、
図１（Ｂ）に示すように、ブリーザ弁（９）でブリーザ弁上流室（１０）とブリーザ弁下流通路（１１）とを区画し、ブリーザ弁上流室（１０）をクランクケース（４）と連通させ、ブリーザ弁下流通路（１１）を吸気通路または大気と連通させるに当たり、
ブリーザ弁上流室（１０）とブリーザ弁下流通路（１１）との間に通気手段（１２）を設け、この通気手段（１２）で、ブリーザ弁（９）の閉弁時にもブリーザ弁上流室（１０）とブリーザ弁下流通路（１１）とが連通するようにした、ことを特徴とするエンジン。
【０００７】
（請求項２の発明）
請求項１に記載したエンジンにおいて、
図１（Ａ）に示すように、ヘッドカバー（１３）の天井壁（１４）にブリーザ弁取付孔（１５）を開口し、図１（Ｂ）に示すように、この天井壁（１４）側を上方と見て、このブリーザ弁取付孔（１５）の中央部からに下向きに有底の弁座筒（１６）を設け、この弁座筒（１６）の上面に弁座（１７）を設け、ブリーザ弁取付孔（１５）にブリーザ弁（９）となるダイヤフラム弁（１８）を取り付け、このダイヤフラム弁（１８）の中央部に弁体（１９）を設け、この弁体（１９）を付勢バネ（２０）で弁座（１７）に着座させ、ヘッドカバー（１３）の上部で、弁座筒（１６）の周壁から天井壁（１４）に沿う向きで弁座筒出口管（２１）を導出し、弁座筒内通路（２２）と弁座筒出口管内通路（２３）とでブリーザ弁下流通路（１１）を形成するに当たり、
図１（Ａ）（Ｂ）に示すように、通気手段（１２）として通気孔（２４）を用い、この通気孔（２４）を弁座筒出口管（２１）の上周壁部分（２５）に設けた、ことを特徴とするエンジン。
【０００８】
（請求項３の発明）
請求項２に記載したエンジンにおいて、
図１（Ａ）（Ｂ）に示すように、通気手段（１２）として通気孔（２４）を用い、この通気孔（２４）を弁座筒出口管（２１）の上周壁部分（２５）に設けたことに代えて、図４（Ａ）（Ｂ）に示すように、通気手段（１２）として通気溝（２６）を設け、この通気溝（２６）を、上方から見て弁座筒出口管（２１）と隣合う位置で、弁座（１７）に設けた、ことを特徴とするエンジン。
【０００９】
（請求項４の発明）
請求項２に記載したエンジンにおいて、
図１（Ａ）（Ｂ）に示すように、通気手段（１２）として通気孔（２４）を用い、この通気孔（２４）を弁座筒出口管（２１）の上周壁部分（２５）に設けたことに代えて、図５に示すように、通気手段（１２）として通気溝（２６）を設け、この通気溝（２６）を、図５（Ｂ）（Ｅ）に示すように、上方から見て弁座筒出口管（２１）と隣合う位置で、弁体（１９）に設けた、ことを特徴とするエンジン。
【００１０】
【発明の効果】
（請求項１の発明）
請求項１の発明は、次の効果を奏する。
《効果１》　潤滑油の油面の高さの検査を正確に行うことができる。
図１（Ｂ）に示すように、通気手段（１２）で、ブリーザ弁（９）の閉弁時にもブリーザ弁上流室（１０）とブリーザ弁下流通路（１１）とが連通するため、エンジン停止後、クランクケース（４）内の温度が下がり、クランクケース（４）の内圧が下がると、クランクケース（４）内には通気手段（１２）により外気が速やかに導入され、クランクケース（４）の内圧は短時間で大気圧となる。このため、図２（Ｂ）に示すように、この時期に潤滑油（６）の油面（７）の高さの検査を行っても、ゲージ挿入筒（２）内の潤滑油の油面（８）の高さが潤滑油溜め（５）内の潤滑油（６）の油面（７）の高さと一致し、潤滑油（６）の油面（７）の高さの検査を正確に行うことができる。
【００１１】
《効果２》　潤滑油の油面の高さの検査時期が制限されない。
エンジン停止後、通気手段（１２）により、クランクケース（４）の内圧は短時間で大気圧となるため、エンジン停止直後から潤滑油の油面の高さの検査を行うことができ、その検査時期が制限されない。
【００１２】
（請求項２から請求項４の発明）
請求項２から請求項４の発明は、請求項１の発明の効果に加え、次の効果を奏する。
《効果３》　潤滑油消費量の増加を抑制することができる。
図１（Ｂ）、図４（Ｂ）、図５（Ａ）に示すように、クランクケース（４）側から通気手段（１２）に向かうオイルミストは、弁座筒出口管（２１）に邪魔され、通気手段（１２）に流入しにくいため、エンジン運転中に、通気手段（１２）からオイルミストが流出する不備が抑制され、潤滑油消費量の増加を抑制することができる。
【００１３】
【発明の実施の形態】
本発明の実施の形態を図面に基づいて説明する。
図１〜図３は本発明の第１実施形態に係るエンジンを説明する図で、この実施形態では、縦形の水冷多気筒ディーゼルエンジンを用いている。
【００１４】
このエンジンの概要は、次の通りである。
図２（Ａ）に示すように、クランクケース（４）を備えたシリンダブロック（３０）の上部にシリンダヘッド（３１）とヘッドカバー（１３）とを順に組み付け、クランクケース（４）の下部にオイル溜め（５）を組み付けている。図３に示すように、シリンダヘッド（３１）の横には吸気マニホルド（３２）を組み付け、ヘッドカバー（１３）の天井壁（１４）にはブリーザ弁カバー（３３）を組み付けている。ブリーザ弁カバー（３３）の下方にはブリーザ装置が配置され、このブリーザ装置と吸気マニホルド（３２）とをブリーザパイプ（３４）で連通させている。図２（Ａ）に示すように、オイル溜め（５）の横幅は、クランクケース（４）のそれよりも広く、図２（Ｂ）の示すように、横張り出し部分の天井壁にオイル補給口を兼ねたゲージ挿入筒（２）を挿通し、ここにオイルレベルゲージ（１）を挿入している。
【００１５】
潤滑装置の構成は、次の通りである。
図２（Ｂ）に示すように、オイルレベルゲージ（１）のゲージ挿入筒（２）の下端部（３）を、クランクケース（４）下方の潤滑油溜め（５）内に溜まった潤滑油（６）の油面（７）よりも低くし、ゲージ挿入筒（２）内に侵入した潤滑油（６）の油面（８）の高さにより、潤滑油溜め（５）内の潤滑油（６）の油面（７）の高さを検査するようにしている。
【００１６】
ブリーザ装置の構成は、次の通りである。
図１（Ｂ）に示すように、ブリーザ弁（９）でブリーザ弁上流室（１０）とブリーザ弁下流通路（１１）とを区画し、ブリーザ弁上流室（１０）をクランクケース（４）と連通させ、ブリーザ弁下流通路（１１）を吸気通路である吸気マニホルド（３２）と連通させる（または大気と連通させる）に当たり、ブリーザ弁上流室（１０）とブリーザ弁下流通路（１１）との間に通気手段（１２）を設け、この通気手段（１２）で、ブリーザ弁（９）の閉弁時にもブリーザ弁上流室（１０）とブリーザ弁下流通路（１１）とが連通するようにしている。
【００１７】
ブリーザ装置の具体的構成は、次の通りである。
図１（Ａ）に示すように、ヘッドカバー（１３）の天井壁（１４）にブリーザ弁取付孔（１５）を開口し、図１（Ｂ）に示すように、この天井壁（１４）側を上方と見て、このブリーザ弁取付孔（１５）の中央部からに下向きに有底の弁座筒（１６）を設け、この弁座筒（１６）の上面に弁座（１７）を設け、ブリーザ弁取付孔（１５）にブリーザ弁（９）となるダイヤフラム弁（１８）を取り付け、このダイヤフラム弁（１８）の中央部に弁体（１９）を設け、この弁体（１９）を付勢バネ（２０）で弁座（１７）に着座させ、ヘッドカバー（１３）の上部で、弁座筒（１６）の周壁から天井壁（１４）に沿う向きで弁座筒出口管（２１）を導出し、弁座筒内通路（２２）と弁座筒出口管内通路（２３）とでブリーザ弁下流通路（１１）を形成する。図１（Ａ）（Ｂ）に示すように、通気手段（１２）として通気孔（２４）を用い、この通気孔（２４）を弁座筒出口管（２１）の上周壁部分（２５）に設けている。この通気孔（２４）は弁座筒出口管（２１）の径方向中央部に配置している。
【００１８】
図４は本発明の第２実施形態に係るエンジンを説明する図で、この第２実施形態は、次の点のみが第１実施形態と異なる。
すなわち、第１実施形態では、図１（Ａ）（Ｂ）に示すように、通気手段（１２）として通気孔（２４）を用い、この通気孔（２４）を弁座筒出口管（２１）の上周壁部分（２５）に設けたが、この第２実施形態では、これに代えて、図４（Ａ）（Ｂ）に示すように、通気手段（１２）として通気溝（２６）を設け、この通気溝（２６）を、上方から見て弁座筒出口管（２１）と隣合う位置で、弁座（１７）に設けた。この通気溝（２６）は弁座筒出口管（２１）の径方向中央部と隣り合う位置に配置している。他の構成は第１実施形態と同じであり、図４中、図１〜図３と同一の要素には同一の符号を付しておく。
【００１９】
図５は本発明の第３実施形態に係るエンジンを説明する図で、この第３実施形態は、次の点のみが第１実施形態と異なる。
すなわち、第１実施形態では、図１（Ａ）（Ｂ）に示すように、通気手段（１２）として通気孔（２４）を用い、この通気孔（２４）を弁座筒出口管（２１）の上周壁部分（２５）に設けたが、この第２実施形態では、これに代えて、図５に示すように、通気手段（１２）として通気溝（２６）を設け、この通気溝（２６）を、上方から見て弁座筒出口管（２１）と隣合う位置で、弁座（１７）に設けた。この通気溝（２６）は弁座筒出口管（２１）の径方向中央部と隣り合う位置に配置している。他の構成は第１実施形態と同じであり、図５中、図１〜図３と同一の要素には同一の符号を付しておく。
【図面の簡単な説明】
【図１】本発明の第１実施形態に係るエンジンを説明する図で、図１（Ａ）はシリンダヘッドの要部平面図、図１（Ｂ）は図１（Ａ）のＢ−Ｂ線断面図である。
【図２】本発明の第１実施形態に係るエンジンを説明する図で、図１（Ａ）は全体正面図、図１（Ｂ）は要部の縦断正面図である。
【図３】本発明の第１実施形態に係るエンジンの平面図である。
【図４】本発明の第２実施形態に係るエンジンを説明する図で、図４（Ａ）はシリンダヘッドの要部平面図、図４（Ｂ）は図４（Ａ）のＢ−Ｂ線断面図である。
【図５】本発明の第３実施形態に係るエンジンを説明する図で、図５（Ａ）はシリンダヘッドの縦断正面図、図５（Ｂ）は通気溝とその周辺部分の底面図、図５（Ｃ）は図５（Ｂ）のＣ−Ｃ線断面図、図５（Ｄ）は図５（Ｂ）のＤ方向矢視図、図５（Ｅ）は弁座とその周辺部分の平面図である。
【符号の説明】
（１）…オイルレベルゲージ、（２）…ゲージ挿入筒、（３）…下端部、（４）…クランクケース、（５）…潤滑油溜め、（６）…潤滑油、（７）…油面、（８）…油面、（９）…ブリーザ弁、（１０）…ブリーザ弁上流室、（１１）…ブリーザ弁下流通路、（１２）…通気手段、（１３）…ヘッドカバー、（１４）…天井壁、（１５）…ブリーザ弁取付孔、（１６）…弁座筒、（１７）…弁座、（１８）…ダイヤフラム弁、（１９）…弁体、（２０）…付勢バネ、（２１）…弁座筒出口管、（２２）…弁座筒内通路、（２３）…弁座筒出口管内通路、（２４）…通気孔、（２５）…上周壁部分、（２６）…通気溝。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an engine.
[0002]
[Prior art]
Conventionally, as an engine, the lower end of the gauge insertion cylinder of the oil level gauge is set lower than the oil level of the lubrication oil stored in the lubrication oil reservoir below the crankcase, and the oil level of the lubrication oil that has entered the gauge insertion cylinder In some cases, the height of the oil level of the lubricating oil in the lubricating oil reservoir is inspected based on the height of the lubricating oil reservoir.
However, in this type of engine, when the breather valve partitions the breather valve upstream chamber and the breather valve downstream passage, the breather valve upstream chamber communicates with the crankcase, and the breather valve downstream passage communicates with the intake passage or the atmosphere. There is no special ventilation means between the breather valve upstream chamber and the breather chamber downstream passage, and when the breather valve is closed, the breather valve upstream chamber and the breather valve downstream passage are disconnected.
[0003]
[Problems to be solved by the invention]
The above prior art has the following problems.
<< Problem 1 >> Inspection of lubricating oil level becomes inaccurate.
When the breather valve is closed, the breather valve upstream chamber and the breather valve downstream passage are disconnected, so after the engine stops, the temperature in the crankcase decreases, and the internal pressure of the crankcase becomes a negative pressure equal to or lower than the atmospheric pressure. This negative pressure state is maintained for a predetermined time. For this reason, when the lube oil level is checked at this time, the lube oil level in the gauge insertion tube is lower than the lube oil sump level. Inspection of oil level is incorrect.
[0004]
<< Problem 2 >> The inspection time of the lubricating oil level is restricted.
In order to solve the above problem 1, if the internal pressure of the crankcase becomes the atmospheric pressure due to the outside air entering from the gap of the seal or the like after the engine operation is stopped, the lubricating oil level is inspected. Good. However, in this case, it is necessary to wait a considerable time after stopping the operation of the engine, and the inspection time of the oil level of the lubricating oil is limited.
[0005]
An object of the present invention is to provide an engine that can solve the above problems.
[0006]
[Means for Solving the Problems]
(Invention of claim 1)
As shown in FIG. 2B, the lower end portion (3) of the gauge insertion tube (2) of the oil level gauge (1) is moved to the lubricating oil reservoir (5) below the crankcase (4). The lubricating oil in the lubricating oil reservoir (5) is made lower than the oil level (7) in (6), and the height of the oil level (8) of the lubricating oil (6) that has penetrated into the gauge insertion tube (2). (6) In the engine which inspects the height of the oil level (7),
As shown in FIG. 1B, a breather valve upstream chamber (10) and a breather valve downstream passage (11) are partitioned by a breather valve (9), and the breather valve upstream chamber (10) is separated from a crankcase (4). When the breather valve downstream passage (11) is communicated with the intake passage or the atmosphere,
A ventilation means (12) is provided between the breather valve upstream chamber (10) and the breather valve downstream passage (11). With the ventilation means (12), even when the breather valve (9) is closed, the breather valve upstream chamber ( 10) The engine characterized in that the breather valve downstream passage (11) communicates with the engine.
[0007]
(Invention of claim 2)
The engine according to claim 1,
As shown in FIG. 1 (A), a breather valve mounting hole (15) is opened in the ceiling wall (14) of the head cover (13), and as shown in FIG. Seen from above, a bottomed valve seat cylinder (16) is provided downward from the center of the breather valve mounting hole (15), and a valve seat (17) is provided on the upper surface of the valve seat cylinder (16). A diaphragm valve (18) serving as a breather valve (9) is attached to the breather valve mounting hole (15), and a valve element (19) is provided at the center of the diaphragm valve (18), and the valve element (19) is urged. The valve (17) is seated on the valve seat (17) by the spring (20), and the valve seat tube outlet pipe (21) is led out from the peripheral wall of the valve seat tube (16) along the ceiling wall (14) above the head cover (13). Then, the breather valve downstream passage (11) is formed by the valve seat inner passage (22) and the valve seat outlet pipe passage (23). Upon the formation,
As shown in FIGS. 1A and 1B, a ventilation hole (24) is used as the ventilation means (12), and the ventilation hole (24) is connected to the upper peripheral wall portion (25) of the valve seat outlet pipe (21). An engine provided in the engine.
[0008]
(Invention of claim 3)
The engine according to claim 2,
As shown in FIGS. 1A and 1B, a ventilation hole (24) is used as the ventilation means (12), and the ventilation hole (24) is connected to the upper peripheral wall portion (25) of the valve seat outlet pipe (21). 4 (A) and 4 (B), a ventilation groove (26) is provided as a ventilation means (12), and the ventilation groove (26) is viewed from above and the valve seat cylinder is provided. An engine provided on a valve seat (17) at a position adjacent to an outlet pipe (21).
[0009]
(Invention of Claim 4)
The engine according to claim 2,
As shown in FIGS. 1A and 1B, a ventilation hole (24) is used as the ventilation means (12), and the ventilation hole (24) is connected to the upper peripheral wall portion (25) of the valve seat outlet pipe (21). 5, a ventilation groove (26) is provided as ventilation means (12), and this ventilation groove (26) is formed as shown in FIGS. 5 (B) and (E). An engine provided on a valve body (19) at a position adjacent to a valve seat outlet pipe (21) when viewed from above.
[0010]
【The invention's effect】
(Invention of claim 1)
The invention of claim 1 has the following effects.
<< Effect 1 >> The lubricating oil level can be accurately inspected.
As shown in FIG. 1 (B), even when the breather valve (9) is closed by the ventilation means (12), the breather valve upstream chamber (10) communicates with the breather valve downstream passage (11). Thereafter, when the temperature in the crankcase (4) decreases and the internal pressure of the crankcase (4) decreases, outside air is rapidly introduced into the crankcase (4) by the ventilation means (12), and the crankcase (4) The internal pressure becomes atmospheric pressure in a short time. Therefore, as shown in FIG. 2 (B), even if the height of the oil level (7) of the lubricating oil (6) is inspected at this time, the level of the lubricating oil The height of (8) matches the height of the oil level (7) of the lubricating oil (6) in the lubricating oil sump (5), and the inspection of the height of the oil level (7) of the lubricating oil (6) can be accurately performed. Can be done.
[0011]
<< Effect 2 >> The inspection time of the lubricating oil level is not limited.
After the engine is stopped, the internal pressure of the crankcase (4) is reduced to the atmospheric pressure in a short time by the ventilation means (12), so that the level of the lubricating oil can be checked immediately after the engine is stopped. The time is not limited.
[0012]
(The invention of claims 2 to 4)
The inventions of claims 2 to 4 have the following effects in addition to the effects of the invention of claim 1.
<< Effect 3 >> An increase in lubricating oil consumption can be suppressed.
As shown in FIG. 1 (B), FIG. 4 (B), and FIG. 5 (A), oil mist traveling from the crankcase (4) side to the ventilation means (12) obstructs the valve seat cylinder outlet pipe (21). Since it is difficult to flow into the ventilation means (12), the deficiency of the oil mist flowing out from the ventilation means (12) during operation of the engine is suppressed, and an increase in lubricating oil consumption can be suppressed.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
FIGS. 1 to 3 are views for explaining an engine according to a first embodiment of the present invention. In this embodiment, a vertical water-cooled multi-cylinder diesel engine is used.
[0014]
The outline of this engine is as follows.
As shown in FIG. 2A, a cylinder head (31) and a head cover (13) are sequentially assembled on an upper portion of a cylinder block (30) having a crankcase (4), and an oil is mounted on a lower portion of the crankcase (4). The reservoir (5) is assembled. As shown in FIG. 3, an intake manifold (32) is attached to the side of the cylinder head (31), and a breather valve cover (33) is attached to the ceiling wall (14) of the head cover (13). A breather device is disposed below the breather valve cover (33), and the breather device and the intake manifold (32) are connected by a breather pipe (34). As shown in FIG. 2A, the lateral width of the oil reservoir (5) is wider than that of the crankcase (4), and as shown in FIG. The oil level gauge (1) is inserted through the gauge insertion cylinder (2) which also serves as.
[0015]
The configuration of the lubrication device is as follows.
As shown in FIG. 2B, the lower end portion (3) of the gauge insertion tube (2) of the oil level gauge (1) is moved to the lubricating oil reservoir (5) below the crankcase (4). The lubricating oil in the lubricating oil reservoir (5) is made lower than the oil level (7) in (6), and the height of the oil level (8) of the lubricating oil (6) that has penetrated into the gauge insertion tube (2). The height of the oil level (7) in (6) is inspected.
[0016]
The configuration of the breather device is as follows.
As shown in FIG. 1B, a breather valve upstream chamber (10) and a breather valve downstream passage (11) are partitioned by a breather valve (9), and the breather valve upstream chamber (10) is separated from a crankcase (4). When the communication is performed to cause the breather valve downstream passage (11) to communicate with the intake manifold (32) serving as the intake passage (or to communicate with the atmosphere), between the breather valve upstream chamber (10) and the breather valve downstream passage (11). The breather means (12) is provided so that the breather valve upstream chamber (10) communicates with the breather valve downstream passage (11) even when the breather valve (9) is closed. .
[0017]
The specific configuration of the breather device is as follows.
As shown in FIG. 1 (A), a breather valve mounting hole (15) is opened in the ceiling wall (14) of the head cover (13), and as shown in FIG. Seen from above, a bottomed valve seat cylinder (16) is provided downward from the center of the breather valve mounting hole (15), and a valve seat (17) is provided on the upper surface of the valve seat cylinder (16). A diaphragm valve (18) serving as a breather valve (9) is attached to the breather valve mounting hole (15), and a valve element (19) is provided at the center of the diaphragm valve (18), and the valve element (19) is urged. The valve (17) is seated on the valve seat (17) by the spring (20), and the valve seat tube outlet pipe (21) is led out from the peripheral wall of the valve seat tube (16) along the ceiling wall (14) above the head cover (13). Then, the breather valve downstream passage (11) is formed by the valve seat inner passage (22) and the valve seat outlet pipe passage (23). It is formed. As shown in FIGS. 1A and 1B, a ventilation hole (24) is used as the ventilation means (12), and the ventilation hole (24) is connected to the upper peripheral wall portion (25) of the valve seat outlet pipe (21). Is provided. The vent hole (24) is arranged at the radial center of the valve seat cylinder outlet pipe (21).
[0018]
FIG. 4 is a diagram illustrating an engine according to a second embodiment of the present invention. The second embodiment differs from the first embodiment only in the following points.
That is, in the first embodiment, as shown in FIGS. 1A and 1B, a ventilation hole (24) is used as the ventilation means (12), and the ventilation hole (24) is connected to the valve seat cylinder outlet pipe (21). In the second embodiment, instead of this, a ventilation groove (26) is provided as a ventilation means (12) as shown in FIGS. 4 (A) and 4 (B). The ventilation groove (26) was provided in the valve seat (17) at a position adjacent to the valve seat cylinder outlet pipe (21) when viewed from above. The ventilation groove (26) is arranged at a position adjacent to the radial center of the valve seat outlet pipe (21). Other configurations are the same as those of the first embodiment. In FIG. 4, the same elements as those in FIGS. 1 to 3 are denoted by the same reference numerals.
[0019]
FIG. 5 is a diagram illustrating an engine according to a third embodiment of the present invention. The third embodiment differs from the first embodiment only in the following points.
That is, in the first embodiment, as shown in FIGS. 1A and 1B, a ventilation hole (24) is used as the ventilation means (12), and the ventilation hole (24) is connected to the valve seat cylinder outlet pipe (21). In the second embodiment, a ventilation groove (26) is provided as the ventilation means (12) instead of the ventilation groove (26) in the second embodiment, as shown in FIG. 26) is provided on the valve seat (17) at a position adjacent to the valve seat outlet pipe (21) when viewed from above. The ventilation groove (26) is arranged at a position adjacent to the radial center of the valve seat outlet pipe (21). Other configurations are the same as those of the first embodiment. In FIG. 5, the same elements as those in FIGS. 1 to 3 are denoted by the same reference numerals.
[Brief description of the drawings]
FIG. 1 is a view for explaining an engine according to a first embodiment of the present invention. FIG. 1 (A) is a plan view of a main part of a cylinder head, and FIG. 1 (B) is a line BB in FIG. 1 (A). It is sectional drawing.
FIGS. 2A and 2B are diagrams illustrating an engine according to a first embodiment of the present invention. FIG. 1A is an overall front view, and FIG. 1B is a longitudinal sectional front view of a main part.
FIG. 3 is a plan view of the engine according to the first embodiment of the present invention.
FIG. 4 is a view for explaining an engine according to a second embodiment of the present invention. FIG. 4 (A) is a plan view of a main part of a cylinder head, and FIG. 4 (B) is a line BB in FIG. 4 (A). It is sectional drawing.
5A and 5B are diagrams illustrating an engine according to a third embodiment of the present invention. FIG. 5A is a longitudinal sectional front view of a cylinder head, and FIG. 5B is a bottom view of a ventilation groove and a peripheral portion thereof. 5 (C) is a cross-sectional view taken along line CC of FIG. 5 (B), FIG. 5 (D) is a view in the direction of arrow D in FIG. 5 (B), and FIG. FIG.
[Explanation of symbols]
(1) Oil level gauge, (2) Gauge insertion tube, (3) Lower end, (4) Crank case, (5) Lubricating oil reservoir, (6) Lubricating oil, (7) Oil Surface, (8) ... oil level, (9) ... breather valve, (10) ... breather valve upstream chamber, (11) ... breather valve downstream passage, (12) ... ventilation means, (13) ... head cover, (14) ... ceiling wall, (15) ... breather valve mounting hole, (16) ... valve seat cylinder, (17) ... valve seat, (18) ... diaphragm valve, (19) ... valve body, (20) ... biasing spring, (21) ... valve seat tube outlet pipe, (22) ... valve seat tube passage, (23) ... valve seat tube outlet tube passage, (24) ... vent hole, (25) ... upper peripheral wall portion, (26) ... vent grooves.

Claims

The lower end (3) of the gauge insertion tube (2) of the oil level gauge (1) is moved from the oil level (7) of the lubricating oil (6) accumulated in the lubricating oil reservoir (5) below the crankcase (4). And the height of the lubricating oil (6) in the lubricating oil reservoir (5) depends on the height of the lubricating oil (6) in the gage insertion cylinder (2). In the engine that was to inspect the height,
The breather valve (9) separates the breather valve upstream chamber (10) and the breather valve downstream passage (11), and connects the breather valve upstream chamber (10) with the crankcase (4) to form a breather valve downstream passage (11). In communication with the intake passage or atmosphere,
A ventilation means (12) is provided between the breather valve upstream chamber (10) and the breather valve downstream passage (11). With the ventilation means (12), even when the breather valve (9) is closed, the breather valve upstream chamber ( 10) The engine characterized in that the breather valve downstream passage (11) communicates with the engine.

The engine according to claim 1,
A breather valve mounting hole (15) is opened in the ceiling wall (14) of the head cover (13), and the ceiling wall (14) side is viewed upward, and downward from the center of the breather valve mounting hole (15). A valve seat (16) having a bottom is provided, a valve seat (17) is provided on an upper surface of the valve seat (16), and a diaphragm valve (18) serving as a breather valve (9) is provided in a breather valve mounting hole (15). And a valve element (19) is provided at the center of the diaphragm valve (18), and the valve element (19) is seated on the valve seat (17) by an urging spring (20). Then, the valve seat outlet pipe (21) is led out from the peripheral wall of the valve seat cylinder (16) in a direction along the ceiling wall (14), and the valve seat pipe passage (22) and the valve seat pipe outlet pipe passage (23). In forming the breather valve downstream passage (11) with
An engine characterized in that a ventilation hole (24) is used as the ventilation means (12), and the ventilation hole (24) is provided in an upper peripheral wall portion (25) of the valve seat outlet pipe (21).

The engine according to claim 2,
Instead of using a ventilation hole (24) as the ventilation means (12) and providing this ventilation hole (24) in the upper peripheral wall portion (25) of the valve seat outlet pipe (21),
A ventilation groove (26) is provided as the ventilation means (12), and the ventilation groove (26) is provided in the valve seat (17) at a position adjacent to the valve seat cylinder outlet pipe (21) when viewed from above. Engine.

The engine according to claim 2,
Instead of using a ventilation hole (24) as the ventilation means (12) and providing this ventilation hole (24) in the upper peripheral wall portion (25) of the valve seat outlet pipe (21),
A ventilation groove (26) is provided as ventilation means (12), and the ventilation groove (26) is provided in the valve body (19) at a position adjacent to the valve seat outlet pipe (21) when viewed from above. Engine.