JPH071002B2 - Variable valve timing of engine - Google Patents
Variable valve timing of engineInfo
- Publication number
- JPH071002B2 JPH071002B2 JP10199186A JP10199186A JPH071002B2 JP H071002 B2 JPH071002 B2 JP H071002B2 JP 10199186 A JP10199186 A JP 10199186A JP 10199186 A JP10199186 A JP 10199186A JP H071002 B2 JPH071002 B2 JP H071002B2
- Authority
- JP
- Japan
- Prior art keywords
- engine
- closing timing
- valve opening
- cam shaft
- transmission means
- 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 - Fee Related
Links
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
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/348—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear by means acting on timing belts or chains
-
- 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
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/024—Belt drive
-
- 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
- F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
- F02B75/18—Multi-cylinder engines
- F02B75/22—Multi-cylinder engines with cylinders in V, fan, or star arrangement
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Valve Device For Special Equipments (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明はエンジンの吸気弁や排気弁の開閉時期をエン
ジンの運転中に進角させあるいは遅角させることのでき
るエンジンの弁開閉時期可変装置に関するもので、特に
二列のシリンダ列を有するＶ形エンジンに好適な装置に
関する。The present invention relates to an engine valve opening / closing timing varying device capable of advancing or retarding the opening / closing timing of an intake valve or an exhaust valve of an engine during operation of the engine. In particular, the present invention relates to a device suitable for a V-type engine having two rows of cylinders.
一般に、４行程エンジンでは、弁の開閉時期を調節する
ために、クランク軸とカム軸との間に掛け渡した調時ベ
ルトや調時チエーンを部分的に押圧してカム軸とクラン
ク軸との間の位相を変化させることが提案されている
（例えば特開昭51−2811号公報、米国特許第3888217号
等）。Generally, in a four-stroke engine, in order to adjust the opening / closing timing of the valve, the timing belt or timing chain that is stretched between the crankshaft and the camshaft is partially pressed to allow the camshaft and the crankshaft to move. It has been proposed to change the phase between them (for example, JP-A-51-2811, US Pat. No. 3888217, etc.).
然しながら、これをそのまゝＶ形エンジンに適用しよう
とすると、各シリンダ列毎に準備せねばならずその構造
が過度に複雑になる。また、シリンダ列毎の弁開閉時期
に齟齬を生じ易くなる不具合もある。However, if this is applied to the V-type engine as it is, it must be prepared for each cylinder row, and the structure becomes excessively complicated. There is also a problem that the valve opening / closing timing for each cylinder row is likely to be inconsistent.
この発明は上記不具合を解消し、構成が簡単で両シリン
ダ列の弁開閉時期に齟齬を生じることのない装置を得る
ことを目的とするもので、Ｖ形に配置された２個のシリ
ンダ列に、吸気カム軸と排気カム軸とを各別に設け、こ
れらカム軸に設けたカム歯車とクランク軸に設けた調時
歯車との間に巻掛け伝動手段を巻回し、その巻掛け伝動
手段を排気カム軸と吸気カム軸とのカム歯車の間を通し
て内側へ引き込むと共に、これと支持腕に設けた補助プ
ーリに巻回し、この支持腕をエンジン本体に揺動自在に
支持し、これを運転状態に応じて揺動させる揺動手段に
連結したものである。An object of the present invention is to solve the above-mentioned problems and to provide a device having a simple structure and not causing a discrepancy in the valve opening / closing timings of both cylinder rows. Two cylinder rows arranged in a V shape are provided. , An intake camshaft and an exhaust camshaft are separately provided, and a winding transmission means is wound between a cam gear provided on the camshaft and a timing gear provided on the crankshaft, and the winding transmission means is exhausted. It is pulled inward through the cam gears of the cam shaft and intake cam shaft, and wound around this and an auxiliary pulley provided on the support arm, and this support arm is swingably supported by the engine body, and this is put into operation. It is connected to a swinging means for swinging accordingly.
エンジンの運転速度の増減に伴つて、支持枠が揺動する
と、２個のシリンダ列のうち、一方の補助プーリは歯付
きベルトを緩め、他方の補助プーリはこれを緊張するか
ら、歯付きベルトは２個のシリンダ列の吸気カム軸の間
で局部的に移動するので、これらのカム軸は同時に同位
相だけ同方向へ回動し、弁の開閉時期をクランク軸に対
して進角あるいは退角させ、その結果吸排気弁が同時に
開弁している時期すなわちオーバーラツプ期間を大小に
調節できる。When the support frame swings as the operating speed of the engine increases or decreases, one of the two cylinder rows releases the toothed belt from one auxiliary pulley and the other auxiliary pulley tensions the toothed belt. Move locally between the intake camshafts of the two cylinder rows, these camshafts simultaneously rotate in the same direction in the same phase, advancing or retracting the valve opening / closing timing with respect to the crankshaft. As a result, the timing when the intake and exhaust valves are simultaneously open, that is, the overlap period, can be adjusted to be large or small.
以下、図示の実施例によつてこの発明を説明すると、図
中、１はＶ形６気筒エンジンであり、シリンダブロツク
２の上面には２個のシリンダ列Ｒ、Ｌが設けられてい
る。各シリンダ列Ｒ、Ｌには、シリンダヘッド３とピス
トン４とで燃焼室５が形成されている。６はクランク
軸、７はコンロツドである。The present invention will be described below with reference to the illustrated embodiment. In the figure, reference numeral 1 is a V-type 6-cylinder engine, and two cylinder rows R and L are provided on the upper surface of a cylinder block 2. A combustion chamber 5 is formed by the cylinder head 3 and the piston 4 in each of the cylinder rows R and L. 6 is a crankshaft, and 7 is a connecting rod.
各燃焼室５は吸気弁10を介して吸気通路11と、排気弁14
を介して排気通路15とが接続されている。吸気通路11は
Ｖバンクの内側に配置されており、排気通路15は外側に
配置されている。16は吸気弁10を開閉する吸気カム軸、
17は排気弁14を開閉する排気カム軸であり、両カム軸1
6,17には第１図で示すように、吸気カム歯車18と排気カ
ム歯車19が取付けられ、クランク軸６に取付けた調時歯
車20との間に巻掛け伝動手段たる歯付きベルト21が巻回
されており、これらは図中、矢印で示すようにいずれも
時計方向へ回転される。Each combustion chamber 5 has an intake valve 11 and an exhaust valve 14 through an intake valve 10.
The exhaust passage 15 is connected via. The intake passage 11 is arranged inside the V bank, and the exhaust passage 15 is arranged outside. 16 is an intake camshaft that opens and closes the intake valve 10,
17 is an exhaust cam shaft that opens and closes the exhaust valve 14, and both cam shafts 1
As shown in FIG. 1, an intake cam gear 18 and an exhaust cam gear 19 are attached to 6,7, and a toothed belt 21 as a winding transmission means is provided between the intake cam gear 18 and the exhaust cam gear 19 and a timing gear 20 attached to the crankshaft 6. They are wound, and each of them is rotated clockwise as shown by the arrow.
この発明において、前記歯付きベルト21は吸気カム軸16
と排気カム軸17とのカム歯車の間を通して内側へ引き込
まれ、そこに設けた補助プーリ22に巻回してある。補助
プーリ22は支持腕23へ回転自在に軸支され、支持腕23は
作動手段24に連結されていて、エンジンの運転状態に応
じて揺動される。In the present invention, the toothed belt 21 is the intake camshaft 16
It is drawn inward through a cam gear between the exhaust cam shaft 17 and the exhaust cam shaft 17, and is wound around an auxiliary pulley 22 provided there. The auxiliary pulley 22 is rotatably supported by a supporting arm 23, and the supporting arm 23 is connected to an actuating means 24 and is swung according to the operating state of the engine.
なお、25はアイドルプーリ、26は歯付きベルト21のテン
シヨンプーリである。また、アイドルプーリ25は、歯付
きベルト21をＶバンクに沿つて巻回すべく設けられるも
ので、必須の構成部材ではなく、第７図のように構成す
れば不要である。Incidentally, 25 is an idle pulley, and 26 is a tension pulley of the toothed belt 21. Further, the idle pulley 25 is provided so as to wind the toothed belt 21 along the V bank, and is not an indispensable constituent member, and is unnecessary if configured as shown in FIG.
こゝで、支持腕23について説明すると、支持腕23は第３
図で示すように、中央部をシリンダブロツク２の一部に
形成された取付孔2aへ球軸受27とブシユ28とを介してボ
ルト29aによつて揺動可能に支持され、かつ２個の補助
プーリ22の近傍で他のボルト29bにより、ベルトの張力
による浮き上がりを防止してある。すなわち、ボルト29
bは第４図で示すように、シリンダブロツク２に設けた
取付座2b上へ、硬質合成樹脂製の鍔付きカラー2cと硬質
合成樹脂製のワツシヤ2dを通して螺着され、カラー2cは
支持腕23の案内孔23aへ摺動のみ可能に精密に嵌合され
ている。なお、この図は、補助プーリ22が鋼球22aを介
して支持腕23上に回動自在に軸支された状態をも示して
いる。Explaining the support arm 23, the support arm 23 is the third
As shown in the figure, the central part is swingably supported by a bolt 29a through a ball bearing 27 and a bush 28 in a mounting hole 2a formed in a part of the cylinder block 2, and two auxiliary Another bolt 29b near the pulley 22 prevents the belt from being lifted due to the tension of the belt. I.e. bolt 29
As shown in FIG. 4, b is screwed onto a mounting seat 2b provided on the cylinder block 2 through a collar 2c made of a hard synthetic resin and a washer 2d made of a hard synthetic resin. It is precisely fitted into the guide hole 23a so that it can only slide. It should be noted that this figure also shows a state in which the auxiliary pulley 22 is pivotally supported on the support arm 23 via the steel ball 22a.
作動手段24はダイヤフラム装置30と２個の腕を有する揺
動リンク32とを含み、腕の一方は支持腕23に係合し、他
方はロツド31を介してダイヤフラム装置30に連結されて
いる。揺動リンク32と支持腕23との連結は第５図および
第６図で示すように、支持腕23に設けた長孔23bへ硬質
の合成樹脂からなるスライダ33を遊合させ、これに設け
た孔33aに揺動リンク32のクランクピン部32aが遊合して
いる。なお、ダイヤフラム装置30は吸気負圧を作動源と
して、クランク軸７の回転速度を信号とするコンピユー
タ（図示しない）によつて揺動制御される。The actuating means 24 includes a diaphragm device 30 and a swing link 32 having two arms, one of which engages the support arm 23 and the other of which is connected to the diaphragm device 30 via a rod 31. As shown in FIGS. 5 and 6, the rocking link 32 and the support arm 23 are connected to each other by allowing a slider 33 made of a hard synthetic resin to loosely fit into a long hole 23b provided in the support arm 23. The crank pin portion 32a of the swing link 32 is loosely engaged with the hole 33a. It should be noted that the diaphragm device 30 is swing-controlled by a computer (not shown) that uses the intake negative pressure as an operation source and uses the rotational speed of the crankshaft 7 as a signal.
次にこの動弁機構の作動を説明すると、エンジンが始動
し、クランク軸６が時計方向へ回転すると、それに伴つ
て歯付きベルト21とこれに駆動される各歯車が同方向へ
回転する。このとき、エンジンの速度が比較的低速であ
ると、ダイヤフラム装置30がロツド31を押し出し、揺動
リンク32が時計方向へ回動する結果、支持腕23も時計方
向へ揺動する。よつて、左シリンダ列Ｌの補助プーリ22
の緊張が弛められる反面、右シリンダ列Ｒの補助プーリ
22を緊張させるので、歯付きベルト21は左シリンダ列Ｌ
の補助プーリ22から右シリンダ列Ｒの補助プーリ22へ向
けて相対的に移動し、各カム歯車18,19を時計方向へ回
転させる。その結果、吸気弁10の開弁時期を遅らせ、吸
気弁10と排気弁14とのオーバーラツプ期間を短縮する。Next, the operation of this valve operating mechanism will be described. When the engine is started and the crankshaft 6 rotates clockwise, the toothed belt 21 and the gears driven by the toothed belt 21 rotate in the same direction. At this time, if the engine speed is relatively low, the diaphragm device 30 pushes the rod 31 and the swing link 32 rotates clockwise, and as a result, the support arm 23 also swings clockwise. Therefore, the auxiliary pulley 22 of the left cylinder row L
While the tension of the right cylinder is released, the auxiliary pulley of the right cylinder row R
22 causes the toothed belt 21 to move to the left cylinder row L.
Relative to the auxiliary pulley 22 of the right cylinder row R to rotate the cam gears 18 and 19 in the clockwise direction. As a result, the opening timing of the intake valve 10 is delayed and the overlap period between the intake valve 10 and the exhaust valve 14 is shortened.
また、エンジンの速度が比較的高速に至れば、ダイヤフ
ラム装置30がロツド31を引き込み、揺動リンク29が反時
計方向へ回動する結果、支持腕23も反時計方向へ揺動
し、左シリンダ列Ｌの補助プーリ22の緊張を強める反
面、右シリンダ列Ｒの補助プーリ22では緊張を弱める結
果、歯付きベルト21は右シリンダ列Ｒの補助プーリ22か
ら左シリンダ列Ｌの補助プーリ22へ局部的に移動して各
カム歯車18,19を反時計方向へ回転させ、クランク軸に
対する吸気弁の開閉時期を進角させる。すなわち開閉時
期を早くしてオーバーラツプ期間を拡大する。Further, when the engine speed reaches a relatively high speed, the diaphragm device 30 pulls the rod 31 and the swinging link 29 rotates counterclockwise. As a result, the support arm 23 also swings counterclockwise and the left cylinder While the tension of the auxiliary pulley 22 of the row L is increased, the tension of the auxiliary pulley 22 of the right cylinder row R is decreased. As a result, the toothed belt 21 is locally transferred from the auxiliary pulley 22 of the right cylinder row R to the auxiliary pulley 22 of the left cylinder row L. The cam gears 18, 19 to rotate counterclockwise to advance the opening / closing timing of the intake valve with respect to the crankshaft. That is, the opening / closing timing is advanced to extend the overlap period.
この発明は以上のように、歯付きベルトの如き巻掛け伝
動手段を、カム歯車の間を通して内側へ引き込むと共
に、これを補助プーリに巻回し、この補助プーリをエン
ジン本体に揺動自在に設けた支持腕に支持し、支持腕を
運転状態に応じて揺動させる揺動手段に連結したもので
あるから、支持腕の回動によつて左右２個のシリンダ列
の弁開閉時期、すなわちクランク軸７に対する位相を同
時に進角しあるいは遅角可能である。よつて、左右のシ
リンダ列間における位相の齟齬が防止できる上に、共通
の作動手段24によつて両シリンダ列の弁開閉時期を調節
できるから、構成が簡単になる等の効果がある。As described above, according to the present invention, the winding transmission means such as the toothed belt is pulled inward through the gaps between the cam gears and wound around the auxiliary pulley, and the auxiliary pulley is swingably provided on the engine body. Since the support arm is connected to the swinging means for swinging the support arm according to the driving state, the valve opening / closing timing of the two cylinder rows on the left and right, that is, the crankshaft, is generated by the rotation of the support arm. The phase with respect to 7 can be advanced or retarded at the same time. Therefore, it is possible to prevent the phase difference between the left and right cylinder rows, and to adjust the valve opening / closing timings of both cylinder rows by the common actuating means 24, so that the structure is simplified.
図面はこの発明の実施例を示すもので、第１図はエンジ
ンのカム軸駆動機構を示す正面図、第２図はエンジンの
要部を示す断面図、第３図は第１図におけるIII−III断
面図、第４図はIV−IV断面図、第５図はＶ−Ｖ断面図、
第６図はその分解斜視図、第７図は他の実施例を示す第
１図相当の正面図である。 ６……クランク軸、18……吸気カム歯車、 19……排気カム歯車、20……調時歯車、 21……歯付きベルト、22……補助プーリ、 23……支持腕、24……作動手段。The drawings show an embodiment of the present invention. FIG. 1 is a front view showing a camshaft drive mechanism of an engine, FIG. 2 is a cross-sectional view showing an essential part of the engine, and FIG. 3 is III- in FIG. III sectional view, FIG. 4 is IV-IV sectional view, FIG. 5 is VV sectional view,
FIG. 6 is an exploded perspective view thereof, and FIG. 7 is a front view corresponding to FIG. 1 showing another embodiment. 6 ... Crankshaft, 18 ... Intake cam gear, 19 ... Exhaust cam gear, 20 ... Timing gear, 21 ... Toothed belt, 22 ... Auxiliary pulley, 23 ... Support arm, 24 ... Actuation means.
Claims (5)
気カム軸と排気カム軸とを各別に設け、これらカム軸に
設けたカム歯車とクランク軸に設けた調時歯車との間に
巻掛け伝動手段を巻回し、その巻掛け伝動手段を排気カ
ム軸と吸気カム軸とのカム歯車の間を通して内側へ引き
込むと共に、これを補助プーリに巻回し、この補助プー
リをエンジン本体に揺動自在に設けた支持腕に支持し、
その支持腕を運転状態に応じて作動する揺動手段に連結
してなるエンジンの弁開閉時期可変装置。1. An intake cam shaft and an exhaust cam shaft are separately provided in two cylinder rows arranged in a V shape, and a cam gear provided on these cam shafts and a timing gear provided on a crank shaft are provided. The winding transmission means is wound in between, the winding transmission means is drawn inward through the cam gear between the exhaust cam shaft and the intake cam shaft, and is wound around the auxiliary pulley, and this auxiliary pulley is attached to the engine body. It is supported by a support arm that is swingable.
A valve opening / closing timing varying device for an engine, in which the supporting arm is connected to a swinging device that operates according to a driving state.
ム軸が配置されている特許請求の範囲第１項記載のエン
ジンの弁開閉時期可変装置。2. A valve opening / closing timing varying device for an engine according to claim 1, wherein each cylinder row is provided with an intake cam shaft facing the V bank.
請求の範囲第１項記載のエンジンの弁開閉時期可変装
置。3. The valve opening / closing timing varying device for an engine according to claim 1, wherein the winding transmission means is a toothed belt.
の範囲第１項記載のエンジンの弁開閉時期可変装置。4. A valve opening / closing timing varying device for an engine according to claim 1, wherein the winding transmission means is a chain.
る特許請求の範囲第１項記載のエンジンの弁開閉時期可
変装置。5. A valve opening / closing timing varying device for an engine according to claim 1, wherein the support arm is swung by increasing or decreasing the speed of the engine.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10199186A JPH071002B2 (en) | 1986-05-06 | 1986-05-06 | Variable valve timing of engine |
| US07/047,053 US4726331A (en) | 1986-05-06 | 1987-05-06 | Means for variable valve timing for engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10199186A JPH071002B2 (en) | 1986-05-06 | 1986-05-06 | Variable valve timing of engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62258110A JPS62258110A (en) | 1987-11-10 |
| JPH071002B2 true JPH071002B2 (en) | 1995-01-11 |
Family
ID=14315299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10199186A Expired - Fee Related JPH071002B2 (en) | 1986-05-06 | 1986-05-06 | Variable valve timing of engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH071002B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105257358A (en) * | 2015-10-06 | 2016-01-20 | 周家全 | Chain transmission system of diesel engine and technological method of chain transmission system |
-
1986
- 1986-05-06 JP JP10199186A patent/JPH071002B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62258110A (en) | 1987-11-10 |
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