JPS632565Y2 - - Google Patents
Info
- Publication number
- JPS632565Y2 JPS632565Y2 JP1982140323U JP14032382U JPS632565Y2 JP S632565 Y2 JPS632565 Y2 JP S632565Y2 JP 1982140323 U JP1982140323 U JP 1982140323U JP 14032382 U JP14032382 U JP 14032382U JP S632565 Y2 JPS632565 Y2 JP S632565Y2
- Authority
- JP
- Japan
- Prior art keywords
- camshaft
- tappet
- lever
- weight
- sickle
- 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 6
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/08—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for decompression, e.g. during starting; for changing compression ratio
- F01L13/085—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for decompression, e.g. during starting; for changing compression ratio the valve-gear having an auxiliary cam protruding from the main cam profile
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Valve Device For Special Equipments (AREA)
Description
【考案の詳細な説明】
本考案は内燃機関の始動に際し、排気弁又は吸
気弁を自動的に僅かに開き、燃焼室内の圧縮圧力
を減少させて始動荷重を軽くすると共に、通常の
回転数に上がれば弁を自動的に閉じるように制御
する始動荷重自動軽減装置に関する。[Detailed description of the invention] This invention automatically opens the exhaust valve or intake valve slightly when starting an internal combustion engine, reduces the compression pressure in the combustion chamber, lightens the starting load, and returns to the normal rotation speed. This invention relates to an automatic starting load reducing device that controls a valve to automatically close when the load increases.
この種の装置は一般に、カム軸と一体回転しそ
のときの遠心力で振れる重錘を備え、その重錘の
揺動により弁開閉用タペツトをカムのベース円に
対し接離させるようにしている。 This type of device generally includes a weight that rotates integrally with the camshaft and is swung by centrifugal force, and the swinging of the weight causes the valve opening/closing tappet to move toward and away from the base circle of the cam. .
本考案も上記遠心力で振れる重錘を備えた始動
荷重自動軽減装置にして、機関停止乃至始動初期
の低速回転時における重錘の位置と、通常回転時
の重錘の位置を確実に維持する機構を簡素化する
と共に、タペツト押上げレバーの動作を円滑確実
に行わせることを目的とする。 The present invention is also an automatic starting load reducing device equipped with a weight that swings due to the centrifugal force as described above, to ensure that the position of the weight during low-speed rotation from engine stop to initial engine startup and the position of the weight during normal rotation are maintained. The purpose is to simplify the mechanism and to ensure that the tappet push-up lever operates smoothly and reliably.
以下本考案の構造を図面に示す実施例について
説明する。１はカム軸、２はカム、３はカム歯車
にして、それら１〜３は一体に形成されていて、
歯車３はカム２に隣接している。４は弁開閉用タ
ペツトで、その下面がカム２に接するように配置
されている。 DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the structure of the present invention shown in the drawings will be described below. 1 is a camshaft, 2 is a cam, and 3 is a cam gear, and these 1 to 3 are integrally formed.
Gear 3 is adjacent to cam 2. Reference numeral 4 denotes a valve opening/closing tappet, which is arranged so that its lower surface is in contact with the cam 2.
５は鎌の形をした重錘で、その柄に相当する部
分５１の端が軸ピン６で歯車３の側面に揺動自在
に取付けられている。 Reference numeral 5 denotes a sickle-shaped weight, the end of which corresponds to a handle 51 is swingably attached to the side surface of the gear 3 with a shaft pin 6.
７はベルクランク形のタペツト押上げレバー
で、カム２と歯車３の間においてカム軸１の周面
に形成した平面部１０１上に、その軸１に直交す
る軸ピン８によつて揺動自在に取付けられてい
る。上記タペツト押圧げレバー７の一端７１はタ
ペツト４の下面に位置し、他端折曲部７２は、鎌
形重錘５の刃部５２に設けた二股部５３に係合し
ている。 Reference numeral 7 denotes a bell-crank-shaped tappet push-up lever, which can be freely swung by a shaft pin 8 perpendicular to the shaft 1 on a flat surface 101 formed on the circumferential surface of the camshaft 1 between the cam 2 and the gear 3. installed on. One end 71 of the tappet pressing lever 7 is located on the lower surface of the tappet 4, and the other end bent portion 72 engages with a bifurcated portion 53 provided on the blade portion 52 of the sickle-shaped weight 5.
鎌形重錘５の柄部５１と、歯車３の側面に植え
たピン９との間に、柄部５１をカム軸１側に引寄
せる引張りコイルばね１０が張られている。引張
りコイルばね１０に代えて、重錘取付軸６の周り
にねじりコイルばねを設けてもよいもので、要す
るに機関停止時乃至始動初期の低速回転中は重錘
５をカム軸１側に寄せて、タペツト押上げレバー
７の端部７１をカム２のベース円２１より外に突
出させるように作用するものであれば、ばねの構
造、その取付け位置に限定はない。 A tension coil spring 10 is stretched between the handle 51 of the sickle-shaped weight 5 and a pin 9 placed on the side of the gear 3 to draw the handle 51 toward the camshaft 1 side. Instead of the tension coil spring 10, a torsion coil spring may be provided around the weight mounting shaft 6. In short, the weight 5 is moved toward the camshaft 1 side when the engine is stopped or during low-speed rotation at the beginning of startup. There are no limitations on the structure of the spring or its mounting position as long as it acts to cause the end 71 of the tappet push-up lever 7 to protrude beyond the base circle 21 of the cam 2.
カム軸１のタペツト押上げレバー取付け個所近
傍に、レバー端７１がベース円２１より外に突出
する位置まで振れた該レバー７を、その位置に止
めるストツパ１１が設けられている。実施例のス
トツパ１１はカム軸１の表面に形成した段部であ
るが、ピンを植えて、それにレバー７が当るよう
にしてもよい。 A stopper 11 is provided near the attachment point of the tappet push-up lever on the camshaft 1 to stop the lever 7 at that position when the lever end 71 has swung to a position where it protrudes outside the base circle 21. The stopper 11 in the embodiment is a step formed on the surface of the camshaft 1, but a pin may be placed thereon so that the lever 7 comes into contact with it.
そして鎌形重錘５の先端に、通常の回転によつ
てその重錘５が振れるとき、カム軸１に当つてそ
れ以上の揺動を規制するストツパ１２が鉤形に形
成されている。 A hook-shaped stopper 12 is formed at the tip of the sickle-shaped weight 5 to abut against the camshaft 1 and restrict further swinging when the weight 5 swings due to normal rotation.
図面は何れも機関停止状態、もしくは始動初期
の回転数がまだ低い状態を示したもので、遠心力
よりばね１０の力が勝つて鎌形重錘５はカム軸１
側に引寄せられ、その二股部５３に係合している
タペツト押上げレバー７が回されてストツパ１１
に当り、その位置を保つている。この時上記レバ
ー７の端部７１が第３図・第４図に示すように、
カムベース円２１より高さＨだけ外方へ出つ張つ
ている。 The drawings all show the engine stopped, or when the engine speed is still low at the beginning of startup, and the force of the spring 10 overcomes the centrifugal force, causing the sickle-shaped weight 5 to move towards the camshaft 1.
The tappet push-up lever 7, which is pulled to the side and engaged with the bifurcated portion 53, is turned and the stopper 11
and maintain that position. At this time, the end portion 71 of the lever 7 as shown in FIGS. 3 and 4,
It protrudes outward from the cam base circle 21 by a height H.
従つてカム軸１が回転すると、１回転毎に圧縮
行程でタペツト４は上記高さＨだけ押上げられる
もので、弁が弁座から離れて圧縮ガスが逃げ、始
動操作の荷重を軽減する。 Therefore, when the camshaft 1 rotates, the tappet 4 is pushed up by the above-mentioned height H in the compression stroke every rotation, and the valve moves away from the valve seat and the compressed gas escapes, reducing the load of the starting operation.
機関の回転が上昇すると、鎌形重錘５はばね１
０に抗して遠心力の作用で軸ピン６を中心に、ス
トツパ１２がカム軸１に当るまで外方に振れ、そ
の位置を保つている。この時タペツト押上げレバ
ー７は重錘５に引かれてカム歯車３の側に回り込
み、その端部７１はカムベース円２１と同じ位置
或はそれよりも内側に入る。 When the rotation of the engine increases, the sickle-shaped weight 5 is moved by the spring 1.
0, the stopper 12 swings outward around the shaft pin 6 until it hits the camshaft 1 due to the action of centrifugal force and maintains that position. At this time, the tappet push-up lever 7 is pulled by the weight 5 and turns around to the side of the cam gear 3, and its end 71 enters the same position as the cam base circle 21 or inside it.
従つてタペツト４に対する押上げ作用はなくな
り、圧縮行程でも弁は完全に閉じる。 Therefore, there is no upward force on the tappet 4, and the valve is completely closed even during the compression stroke.
本考案始動荷重自動軽減装置は上記の構成であ
るから、機関停止時乃至始動初期の低速回転中に
おける鎌形重錘５及びタペツト押上げレバー７の
作動位置が確実に維持され、燃焼室内の圧力を下
げることができる。 Since the automatic starting load reducing device of the present invention has the above-mentioned configuration, the operating positions of the sickle-shaped weight 5 and the tappet push-up lever 7 are reliably maintained during low-speed rotation when the engine is stopped or at the initial stage of starting, thereby reducing the pressure inside the combustion chamber. Can be lowered.
又通常回転時における上記重錘５及びレバー７
の作動位置も確実に維持され、不用意にタペツト
４を押上げるおそれがない。 Also, the weight 5 and lever 7 during normal rotation
The operating position of the tappet 4 is also maintained reliably, and there is no risk of pushing the tappet 4 up inadvertently.
更にカム軸１の回転でその軸上のタペツト押上
げレバー７の先端７１がタペツト４に当つてレバ
ー７に抵抗が加わるが、そのレバー７の支点軸８
がカム軸１と直交する向きに設けられているの
で、その軸８を支点とするレバー７の揺動には無
理がなくてレバー７は円滑確実に動作するもので
ある。 Furthermore, as the camshaft 1 rotates, the tip 71 of the tappet push-up lever 7 on that shaft hits the tappet 4 and resistance is applied to the lever 7, but the fulcrum shaft 8 of the lever 7
is provided in a direction perpendicular to the camshaft 1, so that the lever 7 can swing with the shaft 8 as a fulcrum without difficulty, and the lever 7 operates smoothly and reliably.
第１図は本考案装置の一部切断正面図、第２図
は第１図−線に沿う縦断側面図、第３図は第
１図の状態からカム軸を90度回した状態の正面
図、第４図は第３図−線に沿う縦断側面図。
１はカム軸、２はカム、３はカム歯車、４はタ
ペツト、５は鎌形重錘、７はタペツト押上げレバ
ー、６・８は軸ピン、１０はばね、１１・１２は
ストツパ。
Fig. 1 is a partially cutaway front view of the device of the present invention, Fig. 2 is a longitudinal sectional side view along the line shown in Fig. 1, and Fig. 3 is a front view of the camshaft rotated 90 degrees from the state shown in Fig. 1. , FIG. 4 is a longitudinal sectional side view taken along the line of FIG. 3. 1 is a cam shaft, 2 is a cam, 3 is a cam gear, 4 is a tappet, 5 is a sickle-shaped weight, 7 is a lever for pushing up the tappet, 6 and 8 are shaft pins, 10 is a spring, and 11 and 12 are stoppers.
Claims (1)
ペツトを往復動させて燃焼室の吸・排気弁を開閉
させる内燃機関において、カムに隣接しているカ
ム軸と一体の歯車の側面に、鎌形重錘の柄部の端
を軸ピンで揺動自在に取付け、上記カムと歯車の
間でカム軸の周面上に、一端がタペツトの下面に
位置し、他端が鎌形重錘の刃部の二股部に係合す
るベルクランク形タペツト押上げレバーを、カム
軸に直交する軸ピンで揺動自在に取付け、機関停
止時乃至始動初期の低速回転中、上記タペツト押
上げレバーのタペツト側端部をカムベース円より
突出させるように付勢するばねを、鎌形重錘と歯
車との間に備えると共に、上記タペツト押上げレ
バーをタペツト押上げ位置に止めるストツパをカ
ム軸に設け、通常の回転による鎌形重錘の揺動を
カム軸で受けて規制するストツパを、その重錘の
先端に形成した内燃機関の始動荷重自動軽減装
置。 In an internal combustion engine, the rotation of the camshaft causes a cam installed on the shaft to reciprocate a tappet to open and close the intake and exhaust valves of the combustion chamber. The end of the handle of the weight is swingably attached with a shaft pin, and one end is located on the circumferential surface of the camshaft between the cam and the gear, one end is located on the lower surface of the tappet, and the other end is located on the blade of the sickle-shaped weight. A bell crank type tappet push-up lever that engages with the fork of the camshaft is swingably mounted with a shaft pin orthogonal to the camshaft, and when the engine is stopped or during low-speed rotation at the beginning of startup, the tappet side end of the above-mentioned tappet push-up lever is attached. A spring is provided between the sickle-shaped weight and the gear to urge the part to protrude from the cam base circle, and a stopper is provided on the camshaft to stop the tappet push-up lever at the tappet push-up position. An automatic starting load reduction device for an internal combustion engine in which a stopper is formed at the tip of a sickle-shaped weight to receive and regulate the swing of the weight using a camshaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1982140323U JPS5943603U (en) | 1982-09-16 | 1982-09-16 | Automatic starting load reduction device for internal combustion engines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1982140323U JPS5943603U (en) | 1982-09-16 | 1982-09-16 | Automatic starting load reduction device for internal combustion engines |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5943603U JPS5943603U (en) | 1984-03-22 |
| JPS632565Y2 true JPS632565Y2 (en) | 1988-01-22 |
Family
ID=30314216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1982140323U Granted JPS5943603U (en) | 1982-09-16 | 1982-09-16 | Automatic starting load reduction device for internal combustion engines |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5943603U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0717770Y2 (en) * | 1990-05-17 | 1995-04-26 | 富士重工業株式会社 | Automatic engine decompression device |
-
1982
- 1982-09-16 JP JP1982140323U patent/JPS5943603U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5943603U (en) | 1984-03-22 |
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