JPS6229616Y2 - - Google Patents
Info
- Publication number
- JPS6229616Y2 JPS6229616Y2 JP10982980U JP10982980U JPS6229616Y2 JP S6229616 Y2 JPS6229616 Y2 JP S6229616Y2 JP 10982980 U JP10982980 U JP 10982980U JP 10982980 U JP10982980 U JP 10982980U JP S6229616 Y2 JPS6229616 Y2 JP S6229616Y2
- Authority
- JP
- Japan
- Prior art keywords
- decompression
- shaft
- rocker arm
- decompression shaft
- 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
- 230000006837 decompression Effects 0.000 claims description 88
- 238000002485 combustion reaction Methods 0.000 description 10
- 230000006835 compression Effects 0.000 description 7
- 238000007906 compression Methods 0.000 description 7
- 230000037431 insertion Effects 0.000 description 5
- 238000003780 insertion Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000003971 tillage Methods 0.000 description 1
Landscapes
- Valve Device For Special Equipments (AREA)
Description
【考案の詳細な説明】
本考案は、デイーゼルエンジンの始動時に燃焼
室内を非圧縮状態として始動時回転を容易にする
ために使用されるデコンプ装置に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a decompression device used to make the combustion chamber in a non-compressed state when starting a diesel engine to facilitate rotation at the time of starting.
従来のこの種のデイーゼルエンジンのデコンプ
装置としては第１図に示す如きものが知られてい
る。このデコンプ装置Ｂは、ロツカーアーム５２
の一端に取付けた調整ネジ５３の先端５３ａをシ
リンダヘツド壁５７に回動自在に取付けたデコン
プ軸５０の角摺面５０ａに係合せしめるととも
に、該デコンプ軸５０の他端５０ｂ側にデコンプ
レバー５１を取付け、該デコンプレバー５１を作
業者が直接手動操作によつて回動させることによ
り前記ロツカーアーム５２を揺動させ、一時的に
燃焼室内を非圧縮状態とするようになつている。 As a conventional decompression device for a diesel engine of this type, the one shown in FIG. 1 is known. This decompression device B includes a Rocker arm 52
The tip 53a of the adjustment screw 53 attached to one end is engaged with the corner sliding surface 50a of the decompression shaft 50 rotatably attached to the cylinder head wall 57, and the decompression lever 51 is attached to the other end 50b of the decompression shaft 50. When the decompression lever 51 is rotated by direct manual operation by an operator, the rocker arm 52 is swung, and the inside of the combustion chamber is temporarily brought into a non-compressing state.
ところが、このデコンプ装置Ｂは遠隔操作を行
なうことができないため、特に耕運機等の内燃機
関駆動作業機にデイーゼルエンジンを搭載したよ
うな場合には始動時毎に作業者が作業機前端部の
エンジン部と作業機後端側のハンドル部との間を
移動しなければならず始動作業が煩雑になるとい
う問題があつた。 However, since this decompression device B cannot be remotely controlled, especially when a diesel engine is installed in an internal combustion engine-driven work machine such as a cultivator, the operator must operate the engine section at the front end of the work machine every time the work machine is started. There was a problem in that the starting operation was complicated because the operator had to move between the handle and the handle on the rear end side of the work machine.
本考案は上記の如き問題に鑑み、シリンダの側
方に配設したデコンプ装置をエンジンから離れた
位置から遠隔操作し得るようにし、しかもその場
合、デコンプ解除操作が自動的に行なえまたデコ
ンプ運転期間を長くとれるようにし、以つて内燃
機関駆動作業機における内燃機関の始動性及び始
動操作性をより一層向上せしめるようにしたデイ
ーゼルエンジンのデコンプ装置を提供することを
目的としてなされたものである。 In view of the above-mentioned problems, the present invention enables the decompression device installed on the side of the cylinder to be remotely controlled from a position away from the engine.In addition, in this case, the decompression release operation can be performed automatically, and the decompression operation period can be The purpose of this invention is to provide a decompression device for a diesel engine that can provide a long engine speed, thereby further improving the startability and startability of an internal combustion engine in an internal combustion engine-driven work machine.
以下、本考案を第２図ないし第５図に示す実施
例に基づいて説明すると、第２図には本考案実施
例のデコンプ装置Ａを装備した内燃機関駆動耕運
機Ｚが示されており、図中符号１は作業機駆動用
内燃機関としてのデイーゼルエンジン、２は自走
式耕土用作業機、３は作業機２のハンドル部を示
している。又、第３図ないし第５図において符号
４はピストン、５はシリンダ、６はシリンダヘツ
ド、７はピストン４の上部に形成される燃焼室、
８はロツカーカバー、９はシリンダヘツド６に形
成された排気通路、１２は燃焼室７に開口する弁
シートであつて、該弁シート１２には排気弁１０
が取付けられている。符号１３は排気弁１０を閉
弁方向に常時付勢せしめるためのスプリングを示
している。符号１５は排気弁１０を開閉するため
のロツカーアームであり、該ロツカーアーム１５
はその中央部を軸１６によつて揺動自在に枢支さ
れている。又、このロツカーアーム１５はその一
端１５ａ側に前記排気弁１０の頭頂部１０ａを当
接係合せしめる一方、他端１５ｂ側には開閉弁タ
イミング調整用ネジ１７及びデコンプ調整用ネジ
２２を取付けている。調整ネジ１７は、通常運転
時における排気弁１０の開弁度を調整するための
ものであつて直棒状の弁押棒１８を介して動弁カ
ム１９と連結されている。 Hereinafter, the present invention will be explained based on the embodiment shown in Figs. 2 to 5. Fig. 2 shows an internal combustion engine-driven cultivator Z equipped with a decompression device A according to an embodiment of the present invention. Reference numeral 1 indicates a diesel engine as an internal combustion engine for driving the working machine, 2 indicates a self-propelled tillage working machine, and 3 indicates a handle portion of the working machine 2. Further, in FIGS. 3 to 5, reference numeral 4 is a piston, 5 is a cylinder, 6 is a cylinder head, 7 is a combustion chamber formed in the upper part of the piston 4,
8 is a rocker cover, 9 is an exhaust passage formed in the cylinder head 6, 12 is a valve seat that opens into the combustion chamber 7, and the exhaust valve 10 is mounted on the valve seat 12.
is installed. Reference numeral 13 indicates a spring for constantly biasing the exhaust valve 10 in the valve closing direction. Reference numeral 15 denotes a rocker arm for opening and closing the exhaust valve 10, and the rocker arm 15
is pivotally supported at its center by a shaft 16. Further, this rocker arm 15 has its one end 15a abutted and engaged with the top portion 10a of the exhaust valve 10, while the other end 15b has an opening/closing valve timing adjustment screw 17 and a decompression adjustment screw 22 attached. . The adjustment screw 17 is used to adjust the degree of opening of the exhaust valve 10 during normal operation, and is connected to a valve drive cam 19 via a straight valve push rod 18.
調整ネジ２２は、デコンプ時の排気弁１０の開
弁度を調整するためのものであつて、その先端２
２ａは前記ロツカーアーム１５の下側に突出せし
められている。ロツカーアーム１５にはこの調整
ネジ２２を介してデコンプ軸２３が係合せしめら
れている。 The adjustment screw 22 is for adjusting the degree of opening of the exhaust valve 10 during decompression, and its tip 2
2a is made to protrude below the rocker arm 15. A decompression shaft 23 is engaged with the rocker arm 15 via this adjustment screw 22.
デコンプ軸２３は、シリンダヘツド６の側壁を
内外方向に貫通して設けたデコンプ軸嵌挿穴３０
に回動自在に挿入されており、その中間部の環状
凹溝２５に嵌挿したテーパピン２７で軸方向の移
動を規制するようにしている。デコンプ軸２３は
そのシリンダヘツド内部に突出した一端２３ａを
角摺面２４ａと半円周面２４ｂとを有する断面半
円状の角摺部２４としており、該角摺部２４の角
摺面２４ａと前記調整ネジ２２の先端２２ａとを
当接させたときロツカーアームの他端１５ａが閉
弁位置にある排気弁頭頂部１０ａと接触するよう
にその取付位置を適宜に設定している。従つてデ
コンプ軸２３を回転させてその角摺部２４の円周
面２４ｂを前記調整ネジ先端２２ａに係合させた
ときにはロツカーアーム１５を介して排気弁１０
を開弁することができる。すなわち、この実施例
ではこの角摺部円周面２４ｂが実用新案登録請求
の範囲にいうところの「偏心係合部２４ｂ」に該
当するものである。 The decompression shaft 23 has a decompression shaft insertion hole 30 that is provided by penetrating the side wall of the cylinder head 6 in the inner and outer directions.
The shaft is rotatably inserted into the shaft, and movement in the axial direction is restricted by a taper pin 27 fitted into an annular groove 25 in the middle. The decompression shaft 23 has one end 23a protruding into the cylinder head as a corner sliding portion 24 having a semicircular cross section and a corner sliding surface 24a and a semicircular circumferential surface 24b. The mounting position is appropriately set so that when the tip 22a of the adjustment screw 22 comes into contact with the rocker arm, the other end 15a of the rocker arm comes into contact with the exhaust valve top 10a in the closed position. Therefore, when the decompression shaft 23 is rotated and the circumferential surface 24b of the corner sliding portion 24 is engaged with the adjusting screw tip 22a, the exhaust valve 10 is rotated through the rocker arm 15.
can be opened. That is, in this embodiment, the corner sliding portion circumferential surface 24b corresponds to the "eccentric engagement portion 24b" as defined in the claims of the utility model registration.
一方、デコンプ軸２３のシリンダヘツド７の外
方にある一端２３ｂにはワイヤー４１が巻回され
る円形状（ホイール状）の往復回動輪２６が固着
されている。この往復回動輪２６とシリンダヘツ
ド６のデコンプ軸嵌挿穴３０の外側端面３０ａと
の間にはデコンプ軸２３に復帰回転力を与える駆
動部材としてスプリング２９が取付けられてい
る。往復回動輪２６は該スプリング２９によつて
常時矢印Ｌ方向（第５図）に回動するように付勢
せしめられている。 On the other hand, a circular (wheel-shaped) reciprocating wheel 26 around which a wire 41 is wound is fixed to one end 23b of the decompression shaft 23 located outside the cylinder head 7. A spring 29 is installed between the reciprocating rotary wheel 26 and the outer end surface 30a of the decompression shaft insertion hole 30 of the cylinder head 6 as a driving member for applying a return rotational force to the decompression shaft 23. The reciprocating rotating wheel 26 is always urged by the spring 29 to rotate in the direction of arrow L (FIG. 5).
尚、スプリング２９のバネ力は、往復回動輪２
６を矢印Ｒ方向に回動させた後にその回転操作力
を解除した時、デコンプ軸２３の角摺部円周面２
４ｂと調整ネジ２２の先端２２ａとが係合してい
る場合には両者間の摩擦力及びデコンプ軸２３と
デコンプ軸嵌挿穴３０との間の摩擦力によつて回
転角度位置が維持され、これに対して相互に係合
状態にあるデコンプ軸２３の角摺部円周面２４ｂ
と調整ネジ２２の先端２２ａとがエンジン始動時
のロツカーアームの揺動により相互に接触、非接
触を繰返す場合にはその非接触の間に、スプリン
グ２９のバネ力によつて往復回動輪２６がデコン
プ軸２３とデコンプ軸嵌挿穴３０との間の摩擦力
に抗して所定速度でゆつくり矢印Ｌ方向に回動す
るようにそのバネ力が適宜に設定されている。 The spring force of the spring 29 is the same as that of the reciprocating rotating wheel 2
6 in the direction of arrow R and then release the rotational operating force, the circumferential surface 2 of the corner sliding portion of the decompression shaft 23
4b and the tip 22a of the adjustment screw 22 are engaged, the rotational angular position is maintained by the frictional force between them and the frictional force between the decompression shaft 23 and the decompression shaft insertion hole 30, In contrast, the circumferential surface 24b of the corner sliding portion of the decompression shaft 23 that is in a mutually engaged state
When the tip 22a of the adjusting screw 22 repeatedly contacts and does not contact each other due to the swinging of the rocker arm when starting the engine, the reciprocating rotating wheel 26 is decompressed by the spring force of the spring 29 during the non-contact period. The spring force is appropriately set so as to slowly rotate in the direction of arrow L at a predetermined speed against the frictional force between the shaft 23 and the decompression shaft insertion hole 30.
符号４０は、適宜長さのガイドチユーブ付ポー
デンワイヤーで構成されたデコンプ軸の操作部材
であつて、作業機２のエンジン側に取付けたブラ
ケツト４４とハンドル側に取付けたブラケツト４
５との間に架設されている。該操作部材は、ガイ
ドチユーブ４２の両端をワイヤ口金４３，４３に
よつてブラケツト４４，４５に固定的に取付けて
いる。ハンドル側のブラケツト４５から突出した
ワイヤー４１の一端４１ａにはワイヤ引張操作用
ノブ４８を取付けている。尚、符号４６は作業機
２に取付けたノブ４８のストツパー部材である。
一方、エンジン側のブラケツト４４から突出した
ワイヤー４１の他端４１ｂは前記往復回動輪２６
の外周に巻回固定されている。従つて、ワイヤー
４１を引張ることによつて往復回動輪２６は矢印
Ｒ方向に回動せしめられる。 Reference numeral 40 denotes a decompression shaft operating member made of a poden wire with a guide tube of an appropriate length, and includes a bracket 44 attached to the engine side of the working machine 2 and a bracket 4 attached to the handle side.
It is constructed between 5 and 5. The operating member has both ends of a guide tube 42 fixedly attached to brackets 44, 45 by wire caps 43, 43. A wire tensioning knob 48 is attached to one end 41a of the wire 41 protruding from the bracket 45 on the handle side. Incidentally, reference numeral 46 is a stopper member of a knob 48 attached to the working machine 2.
On the other hand, the other end 41b of the wire 41 protruding from the bracket 44 on the engine side is attached to the reciprocating rotating wheel 26.
It is wound and fixed around the outer circumference of the . Therefore, by pulling the wire 41, the reciprocating rotary wheel 26 is rotated in the direction of arrow R.
更に、ワイヤー４１の前記エンジン側でブラケ
ツト４４と往復回動輪２６との間にはワイヤー固
定金具３６を取付けるとともに、該ワイヤー固定
金具３６とブラケツト４４との間に圧縮バネ３８
を設けている。この圧縮バネ３８は、ワイヤー４
１を常時矢印Ｎ方向に復帰せしめる如く作用す
る。尚、符号３７は圧縮バネ３８のバネ受けであ
り、ワイヤー固定金具３６によつて矢印Ｎ方向へ
の移動が規制されている。この操作部材４０は、
ノブ４８を引張操作すると圧縮バネ３８が収縮
し、往復回動輪２６を矢印Ｒ方向に回動させるこ
とができるが、ノブ４８を放せばワイヤー４１は
往復回動輪２６の回動位置如何に拘わらずバネ３
８の作用によつて矢印Ｎ方向に引き戻される。 Further, a wire fixing fitting 36 is installed between the bracket 44 and the reciprocating rotating wheel 26 on the engine side of the wire 41, and a compression spring 38 is installed between the wire fixing fitting 36 and the bracket 44.
has been established. This compression spring 38 is connected to the wire 4
1 always returns in the direction of arrow N. Note that reference numeral 37 is a spring holder for the compression spring 38, and its movement in the direction of arrow N is restricted by the wire fixing fitting 36. This operating member 40 is
When the knob 48 is pulled, the compression spring 38 is contracted and the reciprocating rotary wheel 26 can be rotated in the direction of the arrow R, but when the knob 48 is released, the wire 41 is moved regardless of the rotational position of the reciprocating rotary wheel 26. spring 3
8, it is pulled back in the direction of arrow N.
次に図示実施例のデコンプ装置Ａの使用法並び
にその作用を説明すると、このデコンプ装置Ａは
エンジン停止時には第３図Ａ及び第４図に示す如
く、デコンプ軸２３がスプリング２９で矢印Ｌ方
向に付勢されており、該デコンプ軸２３の角摺面
２４ａには前記ロツカーアーム１５の一端１５ｂ
に取付けた調整ネジ先端２２ａが係合せしめられ
ている。又、ワイヤー４１は圧縮バネ３８によつ
て矢印Ｎ側に付勢された状態となつている。 Next, the usage and operation of the decompression device A of the illustrated embodiment will be explained. When the engine is stopped, the decompression shaft 23 is moved in the direction of the arrow L by the spring 29, as shown in FIGS. 3A and 4. The corner sliding surface 24a of the decompression shaft 23 has one end 15b of the rocker arm 15.
The adjusting screw tip 22a attached to the holder is engaged with the adjusting screw tip 22a. Further, the wire 41 is biased in the direction of arrow N by the compression spring 38.
エンジンの始動に際しては、先ず、操作部材４
０のノブ４８を矢印Ｍ方向に引張つて往復回動輪
２６を矢印Ｒ方向に回動させ、調整ネジ先端２２
ａをデコンプ軸２３の角摺部円周面２４ｂに係合
させる（第３図Ｂ参照）。角摺部円周面２４ｂと
調整ネジ先端２２ａとが係合すると、角摺部２４
の偏心量即ちデコンプ軸２３の半径寸法に相当す
る高さだけロツカーアーム１５の一端１５ｂが持
ち上り、該ロツカーアームの他端１５ａで排気弁
１０を下方に押し下げて開弁する。この状態でノ
ブ４８を放すとワイヤー４１は圧縮バネ３８の作
用によつて元の位置まで復帰するが、デコンプ軸
２３は角摺部円周面２４ｂと調整ネジ先端２２ａ
との間の摩擦力及びデコンプ軸２３の外周面とデ
コンプ軸嵌挿穴３０との間の摩擦力によつて角摺
部円周面２４ｂに対する回転方向の相対位置を維
持している。従つて、排気弁１０は開弁状態のま
ま維持され、エンジンはデコンプ状態となつてい
る。 When starting the engine, first, the operating member 4
0 knob 48 in the direction of arrow M to rotate the reciprocating rotary wheel 26 in the direction of arrow R, and tighten the adjustment screw tip 22.
a to engage with the circumferential surface 24b of the corner sliding portion of the decompression shaft 23 (see FIG. 3B). When the corner sliding portion circumferential surface 24b and the adjustment screw tip 22a engage, the corner sliding portion 24
One end 15b of the rocker arm 15 is lifted by a height corresponding to the eccentricity of the decompression shaft 23, that is, the radial dimension of the decompression shaft 23, and the other end 15a of the rocker arm pushes down the exhaust valve 10 to open it. When the knob 48 is released in this state, the wire 41 returns to its original position due to the action of the compression spring 38, but the decompression shaft 23 is connected to the corner sliding part circumferential surface 24b and the adjusting screw tip 22a.
The relative position in the rotational direction with respect to the corner sliding portion circumferential surface 24b is maintained by the frictional force between the outer peripheral surface of the decompression shaft 23 and the decompression shaft insertion hole 30. Therefore, the exhaust valve 10 is maintained in an open state, and the engine is in a decompressed state.
次にセルモータあるいはリコイルスタータ（図
示省略）等の始動装置によつて機関軸（図示省
略）を回転させるが、この時排気弁１０がデコン
プ装置Ａによつて開弁されているため、吸気が圧
縮されず小回転力で容易に回転させることができ
る。機関軸が回転せしめられるとそれに伴なつて
動弁カム１９が回転してロツカーアーム１５を揺
動させる。このロツカーアーム１５の揺動時に
は、デコンプ軸２３の角摺部円周面２４ｂに対し
て、ロツカーアーム１５の一端１５ｂ側に取付け
られている調整ネジ先端２２ａが接触、非接触を
繰返すこととなるが、前述の非接触時にはデコン
プ軸２３の角摺部円周面２４ｂから調整ネジ先端
２２ａが離れるため両者間に摩擦係合力が作用し
なくなり、デコンプ軸２３はスプリング２９のバ
ネ力によつて矢印Ｌ方向（第３図Ｂ参照）に次第
に回転せしめられる。デコンプ軸２３が第３図Ｂ
の状態から第３図Ａに示す如く角摺面２４ａと調
整ネジ先端２２ａとが係合する位置まで復帰せし
められると、デコンプ装置Ａによるデコンプ作用
が解除されるため吸気の圧縮作用が開始され、エ
ンジン１が始動する。即ち、この実施例のデコン
プ装置Ａは、操作部材４０によつてデコンプ装置
Ａをセツトした状態で作動させると所定の設定時
間後に自動的にデコンプ作用が解除されエンジン
が始動せしめられるようになつている。 Next, the engine shaft (not shown) is rotated by a starting device such as a starter motor or a recoil starter (not shown), but at this time, the exhaust valve 10 is opened by the decompression device A, so the intake air is compressed. It can be easily rotated with a small rotational force. When the engine shaft is rotated, the valve operating cam 19 rotates and the rocker arm 15 is oscillated. When the rocker arm 15 swings, the adjustment screw tip 22a attached to one end 15b of the rocker arm 15 repeatedly comes into contact with and does not contact the circumferential surface 24b of the corner sliding portion of the decompression shaft 23. When the above-mentioned non-contact occurs, the adjustment screw tip 22a separates from the corner sliding portion circumferential surface 24b of the decompression shaft 23, so no frictional engagement force acts between them, and the decompression shaft 23 is moved in the direction of arrow L by the spring force of the spring 29. (See Figure 3B). The decompression shaft 23 is
When the angle sliding surface 24a and the adjustment screw tip 22a are returned from the state shown in FIG. 3A to the position where they engage, the decompression action by the decompression device A is released, and the compression action of the intake air is started. Engine 1 starts. That is, in the decompression device A of this embodiment, when the decompression device A is set and operated by the operation member 40, the decompression action is automatically canceled after a predetermined set time and the engine is started. There is.
尚、本〓案のように往復回動輪２６を円形状に
形成した場合には、該往復回動輪２６にかえて例
えば片持ちレバー状の往復部材を使用する場合に
比してデコンプ軸２３の回転角を大きくとること
ができる（例えば、片持ちレバーの場合には最大
180゜が限度であるが、このような円形回動輪の
場合には最大360゜まで可能である）。従つて、デ
コンプ作用を行なわしめる如く作用するデコンプ
軸２３の半円周面２４ｂをより大角度範囲に亘つ
て形成してデコンプ運転期間の増大を図ることが
可能となる。 Incidentally, when the reciprocating rotary wheel 26 is formed in a circular shape as in the present proposal, the decompression shaft 23 becomes smaller than when a reciprocating member in the form of a cantilever, for example, is used instead of the reciprocating rotary wheel 26. A large rotation angle can be achieved (for example, in the case of a cantilever lever, the maximum
The maximum angle is 180°, but with a circular rotating wheel like this, it is possible to rotate up to 360°). Therefore, it is possible to extend the decompression operation period by forming the semicircular circumferential surface 24b of the decompression shaft 23 that acts to perform a decompression action over a larger angular range.
続いて、本考案のデコンプ装置の効果を説明す
ると、本考案では、エンジン本体の側方に配設さ
れるデコンプ装置をワイヤー等の遠隔操作部材を
介することによつてエンジン本体から離れた位置
から容易に操作することができるようにしている
たため、特に図示実施例の如くデイーゼルエンジ
ンを耕運機等の作業機に搭載した場合には、作業
者が始動時毎にエンジン本体側に移動することな
くハンドル側から全操作を行なうことができ、エ
ンジン本体の側方においてデコンプ操作を行なう
ようにした従来のデコンプ装置に比べて始動時の
操作性を向上せしめることができるという効果が
得られる。 Next, to explain the effects of the decompression device of the present invention, in the present invention, the decompression device installed on the side of the engine body can be operated from a position away from the engine body by using a remote control member such as a wire. Because it is designed to be easy to operate, especially when the diesel engine is mounted on a working machine such as a cultivator as in the illustrated embodiment, the operator can easily operate the handle without having to move toward the engine body each time the engine is started. All operations can be performed from the side, resulting in improved operability during startup compared to conventional decompression devices in which decompression is performed from the side of the engine body.
又、本考案によればデコンプ軸がスプリングに
よつてデコンプ解除位置側に付勢されており、し
かもエンジン始動時においてロツカーアームとデ
コンプ軸の偏心係合部が相互に接触、非接触を繰
返す状態となつた場合は該非接触状態の間に前記
スプリングによつて該デコンプ軸２３が所定の回
動速度で（換言すれば所定時間かかつて）デコン
プ解除位置まで自動的に回動せしめられるように
なつているため、デコンプ解除のための特別の操
作は何ら不要となり、エンジン始動時の操作性が
さらに一層向上するという効果がある。 Further, according to the present invention, the decompression shaft is biased toward the decompression release position by the spring, and the eccentric engagement portion of the rocker arm and the decompression shaft repeatedly contacts and non-contact with each other when starting the engine. If this happens, the decompression shaft 23 is automatically rotated to the decompression release position by the spring during the non-contact state at a predetermined rotational speed (in other words, within a predetermined period of time). Therefore, there is no need for any special operation to release the decompression, which has the effect of further improving the operability when starting the engine.
さらに、本考案によれば、引張操作されるワイ
ヤー等の線条部材が巻回された円形状の往復回動
輪をデコンプ軸に取付け、該線条部材によつて上
記往復回動輪を回動させることにより上記デコン
プ軸をデコンプ位置とデコンプ解除位置の間で回
動操作し得るようにしているため、該往復回動輪
のかわりにたとえば片持ちレバー状の回動部材を
使用する場合に比してデコンプ軸の全回転角を大
きくとつてデコンプ状態を保持し得る期間の延長
を図ることができ、それだけエンジンの始動時回
転が容易となりその始動性が向上するという効果
も得られる。 Further, according to the present invention, a circular reciprocating wheel around which a tension-operated wire member such as a wire is wound is attached to the decompression shaft, and the reciprocating wheel is rotated by the wire member. As a result, the decompression shaft can be rotated between the decompression position and the decompression release position, compared to the case where, for example, a cantilever-shaped rotation member is used instead of the reciprocating rotation wheel. By increasing the total rotation angle of the decompression shaft, it is possible to extend the period during which the decompression state can be maintained, and the engine can be rotated more easily when starting, thereby improving its startability.
第１図は従来のデコンプ装置の構造説明図、第
２図は本考案実施例のデコンプ装置を取付けた内
燃機関駆動耕運機の外観図、第３図Ａ及び第３図
Ｂは第２図のデコンプ装置の作動説明図、第４図
は第３図Ａの−矢視図、第５図は第４図のＶ
−Ｖ矢視図である。
１０……排気弁、１５……ロツカーアーム、２
３……デコンプ軸、２４ｂ……偏心係合部、２６
……往復回動輪、２９……スプリング、４０……
操作部材。
Fig. 1 is a structural explanatory diagram of a conventional decompression device, Fig. 2 is an external view of an internal combustion engine-driven cultivator equipped with a decompression device according to an embodiment of the present invention, and Figs. 3A and 3B are the decompression device of Fig. 2. An explanatory diagram of the operation of the device, Fig. 4 is a - arrow view of Fig. 3 A, Fig. 5 is a view of V in Fig. 4.
-V arrow view. 10...Exhaust valve, 15...Rotzker arm, 2
3...Decompression shaft, 24b...Eccentric engagement part, 26
... Reciprocating rotating wheel, 29 ... Spring, 40 ...
Operation member.
Claims (1)
アーム１５と係合する偏心係合部２４ｂを有する
デコンプ軸２３を、前記偏心係合部２４ｂが前記
ロツカーアーム１５と係合して前記吸気弁又は排
気弁１０を開弁状態のまま保持するデコンプ位置
と前記偏心係合部２４ｂが前記ロツカーアーム１
５と非係合となつて前記吸気弁又は排気弁１０の
開閉作動を許容するデコンプ解除位置の２位置間
にまたがつて回動可能とし、さらに該デコンプ軸
２３に対しては該デコンプ軸２３をそのデコンプ
位置側に回動せしめる操作部材４０を接続してな
るデイーゼルエンジンのデコンプ装置であつて、
前記デコンプ軸２３に前記操作部材４０のワイヤ
ー４１等の線条部材を巻回した円形状の往復回動
輪２６を設け、該デコンプ軸２３はこれを適宜の
スプリング２９によつてデコンプ解除位置側に向
けて付勢する一方、該スプリング２９は前記デコ
ンプ軸２３の偏心係合部２４ｂと前記ロツカーア
ーム１５が係合状態にあるときには前記デコンプ
軸２３を回動せしめ得ずこれに対して相互に係合
状態にある前記デコンプ軸２３の偏心係合部２４
ｂと前記ロツカーアーム１５とがエンジン始動時
のロツカーアームの揺動により相互に接触、非接
触を繰返す状態となつたときには前記デコンプ軸
２３をその回動抵抗に抗して所定の回動速度でし
かもデコンプ解除位置に達するまで回動せしめ得
るようにそのバネ力が設定されていることを特徴
とするデイーゼルエンジンのデコンプ装置。 The decompression shaft 23 has an eccentric engagement part 24b that engages with a rocker arm 15 that drives the intake valve or exhaust valve 10 to open or close. The decompression position where the valve remains open and the eccentric engaging portion 24b are connected to the rocker arm 1.
The decompression shaft 23 is rotatable between two decompression release positions in which the decompression release position disengages with the decompression shaft 23 and allows the opening/closing operation of the intake valve or exhaust valve 10. A decompression device for a diesel engine, which is connected to an operating member 40 for rotating the engine to its decompression position,
The decompression shaft 23 is provided with a circular reciprocating wheel 26 around which a wire member such as the wire 41 of the operating member 40 is wound, and the decompression shaft 23 is moved to the decompression release position side by an appropriate spring 29. On the other hand, when the eccentric engaging portion 24b of the decompression shaft 23 and the rocker arm 15 are in an engaged state, the spring 29 cannot rotate the decompression shaft 23 and engages with it. The eccentric engagement portion 24 of the decompression shaft 23 in the state
When the rocker arm 15 and the rocker arm 15 repeatedly contact and non-contact with each other due to the swinging of the rocker arm when the engine is started, the decompression shaft 23 is rotated at a predetermined rotational speed against the rotational resistance. A decompression device for a diesel engine, characterized in that its spring force is set so that it can be rotated until it reaches a release position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10982980U JPS6229616Y2 (en) | 1980-08-02 | 1980-08-02 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10982980U JPS6229616Y2 (en) | 1980-08-02 | 1980-08-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5733206U JPS5733206U (en) | 1982-02-22 |
| JPS6229616Y2 true JPS6229616Y2 (en) | 1987-07-30 |
Family
ID=29470998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10982980U Expired JPS6229616Y2 (en) | 1980-08-02 | 1980-08-02 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6229616Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014526655A (en) * | 2011-09-21 | 2014-10-06 | ジェイコブス ビークル システムズ、インコーポレイテッド | Method and system for decompression of engine cylinder |
-
1980
- 1980-08-02 JP JP10982980U patent/JPS6229616Y2/ja not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014526655A (en) * | 2011-09-21 | 2014-10-06 | ジェイコブス ビークル システムズ、インコーポレイテッド | Method and system for decompression of engine cylinder |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5733206U (en) | 1982-02-22 |
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