JPS6444307U - - Google Patents
Info
- Publication number
- JPS6444307U JPS6444307U JP13830887U JP13830887U JPS6444307U JP S6444307 U JPS6444307 U JP S6444307U JP 13830887 U JP13830887 U JP 13830887U JP 13830887 U JP13830887 U JP 13830887U JP S6444307 U JPS6444307 U JP S6444307U
- Authority
- JP
- Japan
- Prior art keywords
- cam
- camshaft
- decompression cam
- decompression
- valve
- 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.)
- Granted
Links
- 230000006837 decompression Effects 0.000 claims description 25
- 230000002093 peripheral effect Effects 0.000 claims 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Output Control And Ontrol Of Special Type Engine (AREA)
- Valve Device For Special Equipments (AREA)
Description
第１図は本考案に係るオートデコンプ装置の一
実施例を備えた４サイクルエンジンの横断側面図
、第２図はその一部縦断正面図、第３図は第２図
の―線矢視図で、圧縮行程にてデコンプ装置
が動作した状態を示したもので、第４図ないし第
６図はエンジンの回転速度が所定値を越えてデコ
ンプ動作が解除される過程を示したものであり、
第７図はデコンプ動作が完全に解除された状態を
図示したものであり、第８図は第２図の―や
し図、第９図は逆転されてデコンプ動作が行なわ
れた状態を示しており、第１０図ないし第１１図
は他の実施例の要部拡大図である。
１……シリンダブロツク、２……シリンダ孔、
３……ピストン、４……コネクテイングロツド、
５……シリンダヘツド、６……燃焼室、７……吸
気通路、８……排気通路、９……給気弁、１０…
…排気弁、１１……バルブスプリング、１２……
カムシヤフト、１３……吸気用動弁カム、１４…
…排気用動弁カム、１５……ベース円、１６……
排気カムリフト、１７……位置決め切欠き、１８
……ピン孔、１９……スプリング受孔、２０……
チエン伝動機構、２１，２２……ロツカーシヤフ
ト、２３，２４……ロツカーアーム、２５……ス
リツパー、２６……デコンプピツクアツプ、３０
……デコンプカム、３１……円孔、３２……ウエ
イト部、３３……位置決め切欠き、３４……デコ
ンプカムリフト、３５……レリーズリフト、３６
……段付き切欠き、３７……浅係合段、３８……
深係合段、４０……位置決めボール、４１……リ
フト切換ピン、４２……カムセツトスプリング、
５０……逆転デコンプカム、５１……逆転デコン
プカムリフト、５２……係合部、５３……ワンウ
エイクラツチ、５４……位置決めプランジヤ。
Fig. 1 is a cross-sectional side view of a 4-cycle engine equipped with an embodiment of an auto decompression device according to the present invention, Fig. 2 is a partially longitudinal front view thereof, and Fig. 3 is a view taken along the line shown in Fig. 2. This shows the state in which the decompression device operates during the compression stroke, and Figures 4 to 6 show the process in which the decompression operation is canceled when the engine rotational speed exceeds a predetermined value.
Fig. 7 shows a state in which the decompression operation is completely released, Fig. 8 shows the palm diagram of Fig. 2, and Fig. 9 shows a state in which the decompression operation is performed in reverse. 10 and 11 are enlarged views of main parts of another embodiment. 1... Cylinder block, 2... Cylinder hole,
3...Piston, 4...Connecting rod,
5... Cylinder head, 6... Combustion chamber, 7... Intake passage, 8... Exhaust passage, 9... Air supply valve, 10...
...Exhaust valve, 11...Valve spring, 12...
Camshaft, 13... Intake valve operating cam, 14...
...Exhaust valve cam, 15...Base circle, 16...
Exhaust cam lift, 17...Positioning notch, 18
...Pin hole, 19...Spring receiving hole, 20...
Chain transmission mechanism, 21, 22...Rocker shaft, 23, 24...Rocker arm, 25...Slipper, 26...Decompression pick-up, 30
... Decompression cam, 31 ... Circular hole, 32 ... Weight part, 33 ... Positioning notch, 34 ... Decompression cam lift, 35 ... Release lift, 36
...Stepped notch, 37...Shallow engagement stage, 38...
deep engagement stage, 40...positioning ball, 41...lift switching pin, 42...camset spring,
50... Reverse decompression cam, 51... Reverse decompression cam lift, 52... Engaging portion, 53... One-way clutch, 54... Positioning plunger.
Claims (1)
閉させる動弁カムのベース円よりやや小径のベー
ス円カム面部の一側にウエイト部が突設されたデ
コンプカムに、前記動弁カムのカムシヤフトより
も大径の円孔が形成され、該動弁カムに隣接して
、該動弁カムシヤフトに前記デコンプカムの円孔
が遊嵌され、排気カムリフトおよびウエイト部に
隣接した位置にて前記動弁カムシヤフトと前記デ
コンプカムとを相互に係止させる係止手段が該カ
ムシヤフトおよびデコンプカムに形成され、前記
動弁カムシヤフトの中心線を挟んで前記係合手段
と反対側に前記デコンプカムの内周面とベースカ
ムシヤフトの外周面とに段付き切欠き係合手段が
形成され、該段付き係合手段より前記カムシヤフ
ト回転方向と逆方向にずれた位置にて前記デコン
プカムの円孔とカムシヤフトの周面との間隙を広
げる方向に付勢するバネ手段が付設され、前記段
付き切欠き係合手段に隣接したデコンプカムにデ
コンプカムリフトが形成されるとともに、該デコ
ンプカムリフトより前記カムシヤフト回転方向と
逆方向にずれた位置にて該デコンプカムに前記デ
コンプカムソフトより低いレリーズリフトが形成
され、前記段付き切欠き手段は、所定回転速度以
下では突起が切欠きの浅い段に係合され、所定回
転速度以上では該突起が切欠きの深い段に係合さ
れるように構成されたことを特徴とする４サイク
ルエンジンのオートデコンプ装置。 In a 4-cycle engine, a decompression cam has a base circle slightly smaller in diameter than the base circle of the valve drive cam that opens and closes the intake and exhaust valves, and a weight part is protruded from one side of the cam surface of the valve drive cam. A circular hole of the decompression cam is formed adjacent to the valve cam, and the circular hole of the decompression cam is loosely fitted into the valve camshaft, and the valve camshaft and the decompression cam are connected to each other at a position adjacent to the exhaust cam lift and the weight part. A locking means for locking the camshaft and the decompression cam to each other is formed on the camshaft and the decompression cam, and the inner peripheral surface of the decompression cam and the outer peripheral surface of the base camshaft are formed on the opposite side of the engaging means across the center line of the valve train camshaft. A stepped notch engagement means is formed in the stepped engagement means, and a stepped notch engagement means is provided at a position offset from the stepped engagement means in a direction opposite to the rotational direction of the camshaft in a direction to widen the gap between the circular hole of the decompression cam and the circumferential surface of the camshaft. A decompression cam lift is formed on the decompression cam adjacent to the stepped notch engaging means, and the decompression cam is provided with a spring means for biasing the decompression cam at a position offset from the decompression cam lift in a direction opposite to the rotational direction of the camshaft. A release lift lower than that of the decompression cam soft is formed, and the stepped notch means has a protrusion that engages with a shallow step of the notch at a predetermined rotational speed or less, and a protrusion that engages with a shallow step of the notch at a predetermined rotational speed or higher. An auto decompression device for a four-stroke engine, characterized in that it is configured to be engaged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13830887U JPH0452413Y2 (en) | 1987-09-11 | 1987-09-11 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13830887U JPH0452413Y2 (en) | 1987-09-11 | 1987-09-11 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6444307U true JPS6444307U (en) | 1989-03-16 |
| JPH0452413Y2 JPH0452413Y2 (en) | 1992-12-09 |
Family
ID=31400527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13830887U Expired JPH0452413Y2 (en) | 1987-09-11 | 1987-09-11 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0452413Y2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02139305U (en) * | 1989-04-25 | 1990-11-21 | ||
| WO2002077422A1 (en) * | 2001-03-26 | 2002-10-03 | Honda Giken Kogyo Kabushiki Kaisha | Decompressor for 4-stroke cycle internal combustion engines |
| WO2007083386A1 (en) * | 2006-01-20 | 2007-07-26 | Honda Motor Co., Ltd. | Decompression device for internal combustion engine |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4145447B2 (en) * | 1999-11-18 | 2008-09-03 | 本田技研工業株式会社 | 4-cycle engine decompression system |
-
1987
- 1987-09-11 JP JP13830887U patent/JPH0452413Y2/ja not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02139305U (en) * | 1989-04-25 | 1990-11-21 | ||
| WO2002077422A1 (en) * | 2001-03-26 | 2002-10-03 | Honda Giken Kogyo Kabushiki Kaisha | Decompressor for 4-stroke cycle internal combustion engines |
| EP1447530A1 (en) * | 2001-03-26 | 2004-08-18 | Honda Giken Kogyo Kabushiki Kaisha | Decompressor for 4-stroke cycle internal combustion engines |
| KR100813746B1 (en) * | 2001-03-26 | 2008-03-13 | 혼다 기켄 고교 가부시키가이샤 | Decompressor for 4 stroke cycle internal combustion engines |
| EP1447530A4 (en) * | 2001-03-26 | 2008-04-09 | Honda Motor Co Ltd | Decompressor for 4-stroke cycle internal combustion engines |
| WO2007083386A1 (en) * | 2006-01-20 | 2007-07-26 | Honda Motor Co., Ltd. | Decompression device for internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0452413Y2 (en) | 1992-12-09 |
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