JPH0517362B2 - - Google Patents
Info
- Publication number
- JPH0517362B2 JPH0517362B2 JP11918584A JP11918584A JPH0517362B2 JP H0517362 B2 JPH0517362 B2 JP H0517362B2 JP 11918584 A JP11918584 A JP 11918584A JP 11918584 A JP11918584 A JP 11918584A JP H0517362 B2 JPH0517362 B2 JP H0517362B2
- Authority
- JP
- Japan
- Prior art keywords
- camshafts
- transmission means
- bank
- camshaft
- banks
- 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 - Lifetime
Links
- 230000005540 biological transmission Effects 0.000 claims description 30
- 238000002485 combustion reaction Methods 0.000 claims description 15
- 238000004804 winding Methods 0.000 claims description 15
- 230000000694 effects Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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
- F01L1/02—Valve drive
-
- 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
- F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
- F02B2275/18—DOHC [Double overhead camshaft]
-
- 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)
- Valve-Gear Or Valve Arrangements (AREA)
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は、２列のバンクをＶ形に配置し、各バ
ンクの気筒上部に吸排気弁駆動用の２本のカム軸
を配置した内燃機関のカム軸駆動装置に関するも
のである。Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to an internal combustion engine in which two rows of banks are arranged in a V shape, and two camshafts for driving intake and exhaust valves are arranged above the cylinders of each bank. The present invention relates to a camshaft drive device.
２列のバンクをＶ形に配置し、その各バンクの
気筒上部に吸気弁と排気弁をそれぞれ駆動する２
本のカム軸を配置するようにした内燃機関があ
る。このような形式の内燃機関では、両バンクの
気筒は相互にクランク軸（カム軸）方向に、少な
くとも連接棒の大端部幅相当の距離だけずらせて
あり、こに伴つて２列のバンクもカム軸方向へ互
いにオフセツトされた状態にしてある。
Two rows of banks are arranged in a V shape, and the intake valve and exhaust valve are driven respectively at the top of the cylinder of each bank.
There is an internal combustion engine that has a book camshaft. In this type of internal combustion engine, the cylinders in both banks are offset from each other in the direction of the crankshaft (camshaft) by at least a distance equivalent to the width of the large end of the connecting rod, and accordingly, the two banks are also offset from each other by a distance equivalent to the width of the large end of the connecting rod. They are offset from each other in the camshaft direction.
このような内燃機関の合計４本のカム軸を駆動
する手段として、ベルト又はチエンなどの巻掛伝
動手段を使用する場合は、１本だけの巻掛伝動手
段で全てのカム軸を駆動しようとすると、張力調
節機構や巻掛伝動手段の取り回しが複雑になつて
しまう不具合がある。このため、２本の巻掛伝動
手段を使用して各バンク毎に個別に駆動する構成
にすると、上記２本の巻掛伝動手段がクランク軸
（カム軸）方向に重なるため、機関全体のクラン
ク軸方向の寸法が大きくなり装置のコンパクト上
から不利になる。 When using a belt or chain as a means of driving a total of four camshafts in such an internal combustion engine, it is difficult to drive all the camshafts with only one winding transmission means. Then, there is a problem that the handling of the tension adjustment mechanism and the winding transmission means becomes complicated. For this reason, if you use a configuration in which two winding transmission means are used to drive each bank individually, the two winding transmission means will overlap in the direction of the crankshaft (camshaft), so the crankshaft of the entire engine will be reduced. The axial dimension becomes large, which is disadvantageous in terms of compactness of the device.
また、一般に吸気弁と排気弁の弁軸同士の挾み
角は、ある程度狭くする方が吸排気抵抗を小さく
し、また燃焼室もコンパクトになり、エンジンの
高速性能を向上する上で有利になるされている。
ところが、機関の４サイクルを同期させるため、
カム軸側の駆動輪の大きさはクランク軸側の２倍
である必要がある関係から、上記のような巻掛伝
動手段による駆動構成では、２本のカム軸の駆動
輪同士が互いに干渉しあわない距離までしか接近
させることができないため、それ以上の接近によ
るエンジンの高速性能の向上は望むことができな
い。 In general, narrowing the angle between the valve shafts of the intake and exhaust valves to a certain extent reduces intake and exhaust resistance, and also makes the combustion chamber more compact, which is advantageous in improving the high-speed performance of the engine. has been done.
However, in order to synchronize the four cycles of the engine,
Since the size of the drive wheel on the camshaft side must be twice that of the crankshaft side, in the drive configuration using the wrap-around transmission means as described above, the drive wheels of the two camshafts may interfere with each other. Since they can only be brought close enough to meet each other, it is not possible to improve the engine's high-speed performance by getting closer than that.
本発明の目的は、クランク軸方向の寸法を小さ
くコンパクトにすると共に、巻掛伝動手段の取り
回しを簡単にし、しかもエンジンの高速性能の向
上を可能にする内燃機関のカム軸駆動装置を提供
することにある。
SUMMARY OF THE INVENTION An object of the present invention is to provide a camshaft drive device for an internal combustion engine that is compact in size in the direction of the crankshaft, simplifies the handling of the winding transmission means, and improves the high-speed performance of the engine. It is in.
上記目的を達成するための本発明のカム軸駆動
装置は、２列のバンクをＶ形に配置し、各バンク
の気筒上部にそれぞれ吸排気弁駆動用の２本のカ
ム軸を配置すると共に、前記２列のバンクを両バ
ンクの気筒が相互にカム軸方向へずれる方向へオ
フセツトさせた内燃機関において、前記各バンク
の２本のカム軸のうちの１本づつとクランク軸と
の間を一つの巻掛伝動手段により巻掛け駆動する
と共に、各バンクの２本のカム軸同士をそれぞれ
上記巻掛伝動手段とは独立の他の伝動手段により
駆動し、この他の伝動手段をそれぞれ前記２列の
バンクの互いに他方より内側へオフセツトした軸
端位置に配置したことを特徴とするものである。
A camshaft drive device of the present invention for achieving the above object has two rows of banks arranged in a V shape, two camshafts for driving intake and exhaust valves arranged above the cylinders of each bank, and In an internal combustion engine in which the two rows of banks are offset in a direction in which the cylinders of both banks are offset from each other in the camshaft direction, the gap between one of the two camshafts of each bank and the crankshaft is aligned. The two camshafts of each bank are driven by other transmission means independent of the above-mentioned winding transmission means, and the other transmission means are connected to the two rows, respectively. The two banks are arranged at shaft end positions that are offset inwardly from each other.
以下、本発明を図に示す実施例により説明す
る。
Hereinafter, the present invention will be explained with reference to embodiments shown in the drawings.
図に示す４サイクル内燃機関において、１はク
ランクケース、２，２′はそのクランクケース１
の上部にＶ形に配置したシリンダ本体、３，３′
は各シリンダ本体２，２′の上部に固定したシリ
ンダヘツド、４，４′はシリンダヘツドカバーで
ある。 In the four-stroke internal combustion engine shown in the figure, 1 is the crankcase, and 2 and 2' are the crankcase 1.
The cylinder body, 3, 3', arranged in a V-shape on the top of the
1 is a cylinder head fixed to the upper part of each cylinder body 2, 2', and 4, 4' is a cylinder head cover.
一方のシリンダ本体２、シリンダヘツド３等に
よりバンク６が構成され、また他方のシリンダ本
体２′、シリンダヘツド３′等によりバンク６′が
構成され、この２列のバンク６，６′はＶ形にな
つている。各バンク６，６′におけるシリンダ本
体３，３′には、それぞれ３個づつの気筒５，５，
５および５′，５′，５′が設けられ、シリンダヘ
ツド４，４′の上部にはそれぞれ吸気弁駆動用の
カム軸７，７′と排気弁駆動用のカム軸８，８′と
が平行に配設されている。また、クランクケース
１の中央には１本のクランク軸９が設けられてい
る。 One cylinder body 2, cylinder head 3, etc. constitute a bank 6, and the other cylinder body 2', cylinder head 3', etc. constitute a bank 6', and these two rows of banks 6, 6' are V-shaped. It's getting old. The cylinder bodies 3, 3' in each bank 6, 6' have three cylinders 5, 5,
5 and 5', 5', 5' are provided, and camshafts 7, 7' for driving the intake valves and camshafts 8, 8' for driving the exhaust valves are provided on the tops of the cylinder heads 4, 4', respectively. are arranged in parallel. Further, one crankshaft 9 is provided at the center of the crankcase 1.
バンク６の気筒５とバンク６′の気筒５′とは、
クランク軸９の方向（カム軸方向）に、少なくと
も連接棒の大端部幅以上の距離ｌだけずらせた関
係にしてあり、このずれに伴つてバンク６と６′
との端部は、互いに他方に対し寸法ｅ，e′だけオ
フセツトされている。寸法ｅとe′とは同一寸法で
あつてもよく、また異なる寸法であつてもよい。 Cylinder 5 of bank 6 and cylinder 5' of bank 6' are:
The banks 6 and 6' are offset in the direction of the crankshaft 9 (camshaft direction) by a distance l that is at least the width of the large end of the connecting rod.
The ends of and are offset from each other by dimensions e and e'. Dimensions e and e' may be the same dimension or may be different dimensions.
上記クランク軸９の軸端と吸気弁駆動用のカム
軸７，７′の各軸端には、それぞれ歯車１０，１
１，１２が固定され、これら歯車１０，１１，１
２に歯付ベルト１３が巻掛けられ、クランク軸９
の動力をカム軸７，７′へそれぞれ伝達するよう
になつている。各カム軸７，７′の歯車１１，１
２の外径は、クランク軸９の歯車１０の外径の２
倍にし、機関の４サイキルを同期させるようにな
つている。１４は張力調整ローラである。 Gears 10 and 1 are provided at the ends of the crankshaft 9 and the camshafts 7 and 7' for driving the intake valves, respectively.
1 and 12 are fixed, and these gears 10, 11, 1
A toothed belt 13 is wound around the crankshaft 9.
power is transmitted to the camshafts 7 and 7', respectively. Gears 11, 1 of each camshaft 7, 7'
2 is the outer diameter of the gear 10 of the crankshaft 9.
It has been doubled and synchronized the engine's four cycle kills. 14 is a tension adjustment roller.
また、バンク６の２本のカム軸７，８には、他
方のバンク６′の端部より寸法ｅのだけ内側へオ
フセツトした端部に対し、それぞれ歯車１５，１
６が固定され、これら歯車１５，１６に歯付ベル
ト１７が巻掛けてある。この歯付ベルト１７によ
り、カム軸７の動力がカム軸８へ伝達されるよう
になつている。また、バンク６′の２本のカム軸
７′，８′には、他方のバンク６の端部より寸法
e′だけ内側へオフセツトした端部に対し、それぞ
れ歯車１８，１９が固定され、これら歯車１８，
１９に歯付ベルト２０が巻掛けてある。この歯付
ベルト２０により、カム軸７′の動力がカム軸
８′へ伝達されるようになつている。 Furthermore, the two camshafts 7 and 8 of the bank 6 are provided with gears 15 and 1, respectively, at an end offset inwardly by a dimension e from the end of the other bank 6'.
6 is fixed, and a toothed belt 17 is wound around these gears 15 and 16. The toothed belt 17 allows the power of the camshaft 7 to be transmitted to the camshaft 8. In addition, the two camshafts 7' and 8' of the bank 6' have a dimension larger than that of the end of the other bank 6.
Gears 18, 19 are fixed to the ends offset inward by e', and these gears 18, 19,
A toothed belt 20 is wound around the belt 19. This toothed belt 20 allows the power of the camshaft 7' to be transmitted to the camshaft 8'.
上述したカム軸駆動装置によると、各バンク
６，６′の２本のカム軸７，８同士及び７′，８′
同士の各伝動手段が、それぞれバンク６，６′の
互いに他に対し寸法ｅ，e′だけオフセツトした内
側に収納された状態になつているため、これらの
伝動手段によつて内燃機関のクランク軸方向の全
体寸法が延長されることはない。 According to the above-described camshaft drive device, the two camshafts 7 and 8 of each bank 6 and 6' and 7' and 8'
The respective transmission means of the internal combustion engine are housed inside the banks 6 and 6', offset from each other by dimensions e and e', so that the crankshaft of the internal combustion engine is The overall dimension in the direction is not extended.
また、上述したカム軸駆動装置によると、クラ
ンク軸９から１：２の比率で動力をカム軸へ入力
しているのは、各バンク６，６′の２本のカム軸
のうち一方のカム軸７，７′に対してだけ行われ
るようにし、２本のカム軸同士７，８及び７′，
８′の伝達は上記クランク軸９からの巻掛伝動手
段とは別の伝動手段により行われるようにしてい
る。そのため、２本のガム軸同士の伝達手段であ
る歯車１５，１６及び１８，１９の大きさは、ク
ランク軸９から動力を入力するための歯車１１，
１２とは無関係に設定することができる。そのた
め、２本のカム軸間寸法を可及的に狭くすること
ができ、それによつて、吸排気弁の弁軸間の挾み
角を可及的に小さくすることができるため、エン
ジンの高速性能向上を容易にすることができる。 Furthermore, according to the above-mentioned camshaft drive device, only one of the two camshafts in each bank 6, 6' inputs power from the crankshaft 9 to the camshaft at a ratio of 1:2. This is done only for shafts 7, 7', and between the two cam shafts 7, 8 and 7',
8' is transmitted by a transmission means different from the winding transmission means from the crankshaft 9. Therefore, the sizes of the gears 15, 16 and 18, 19, which are the means of transmitting the two gum shafts, are the same as that of the gear 11, which inputs power from the crankshaft 9.
It can be set independently of 12. Therefore, the dimension between the two cam shafts can be made as narrow as possible, and the angle between the valve shafts of the intake and exhaust valves can be made as small as possible. Performance can be easily improved.
なお、上述の実施例では、クランク軸９から各
バンク６，６′のカム軸の一方へ動力伝達する巻
掛伝動手段として歯付ベルトを例示したが、この
ベルトに代えてチエンを使用してもよい。 In the above embodiment, a toothed belt was used as an example of a winding transmission means for transmitting power from the crankshaft 9 to one of the camshafts of each bank 6, 6', but a chain could be used instead of this belt. Good too.
また、２本のカム軸同士の動力伝達手段とし
て、同じく歯付ベルトを例示したが、このベルト
に代えてチエンを使用してもよく、またこのベル
トやチエン等の巻掛伝動手段の代りに、歯付同士
を直接噛合させてもよい。 Furthermore, although a toothed belt is similarly illustrated as an example of a power transmission means between two camshafts, a chain may be used instead of this belt, and a winding transmission means such as a belt or chain may be used instead of , the teeth may be directly engaged with each other.
上述したように本発明のカム軸駆動装置は、２
列のバンクをＶ形に配置し、各バンクの気筒上部
にそれぞれ吸排気弁駆動用の２本のカム軸を配置
すると共に、前記２列のバンクを両バンクの気筒
が相互にカム軸方向へずれる方向へオフセツトさ
せた内燃機関において、前記各バンクの２本のカ
ム軸のうちの１本づつとクランク軸との間を一つ
の巻掛伝動手段により巻掛け駆動すると共に、各
バンクの２本のカム軸同士をそれぞれ上記巻掛伝
動手段とは独立の他の伝動手段により駆動し、こ
の他の伝動手段をそれぞれ前記２列のバンクの互
いに他方より内側へオフセツトした軸端位置に配
置したので、２本のカム軸同士の駆動用伝達手段
は実質的に機関のクランク軸方向の寸法を延長す
ることはなく、機関全体をコンパクトにすると共
に、巻掛伝動手段の取り回しを簡単にする。
As described above, the camshaft drive device of the present invention has two
The rows of banks are arranged in a V-shape, and two camshafts for driving intake and exhaust valves are arranged above the cylinders of each bank, and the cylinders of both banks are arranged in the direction of the camshafts of the two rows of banks. In an internal combustion engine that is offset in the direction of deviation, one of the two camshafts of each bank and the crankshaft is wound and driven by one winding transmission means, and the two camshafts of each bank are The camshafts of the two banks are each driven by another transmission means independent of the above-mentioned winding transmission means, and each of the other transmission means is arranged at a shaft end position offset inward from the other of the two banks. The drive transmission means between the two camshafts does not substantially increase the dimension of the engine in the crankshaft direction, making the entire engine compact and making the winding transmission means easier to handle.
また、２本のカム軸同士を駆動する伝動手段
が、クランク軸から動力を入力する巻掛伝動手段
と独立であるため、両カム軸間寸法を可及的に小
さくすることができ、それによつてエンジンの高
速性能向上を可能にする。 In addition, since the transmission means that drives the two camshafts is independent of the wrap-around transmission means that inputs power from the crankshaft, the dimension between the two camshafts can be made as small as possible. This makes it possible to improve the engine's high-speed performance.
第１図は本発明の実施例によるカム軸駆動装置
を有する内燃機関の平面図、第２図は同内燃機関
の側面図である。
５，５′……気筒、６，６′……バンク、７，
７′……吸気弁駆動用のカム軸、８，８′……排気
弁駆動用のカム軸、９……クランク軸、１０，１
１，１２……歯車、１３……歯付ベルト（巻掛伝
動手段）、１５，１６，１８，１９……歯車、１
７，２０……歯付ベルト（他の伝動手段）。
FIG. 1 is a plan view of an internal combustion engine having a camshaft drive device according to an embodiment of the present invention, and FIG. 2 is a side view of the same internal combustion engine. 5,5'...Cylinder, 6,6'...Bank, 7,
7'...Camshaft for driving the intake valve, 8, 8'...Camshaft for driving the exhaust valve, 9...Crankshaft, 10,1
1, 12... Gear, 13... Toothed belt (wrapping transmission means), 15, 16, 18, 19... Gear, 1
7, 20...Toothed belt (other transmission means).
Claims (1)
筒上部にそれぞれ吸排気弁駆動用の２本のカム軸
を配置すると共に、前記２列のバンクを両バンク
の気筒が相互にカム軸方向へずれる方向へオフセ
ツトさせた内燃機関において、前記各バンクの２
本のカム軸のうちの１本づつとクランク軸との間
を一つの巻掛伝動手段により巻掛け駆動すると共
に、各バンクの２本のカム軸同士をそれぞれ上記
巻掛伝動手段とは独立の他の伝動手段により駆動
し、この他の伝動手段をそれぞれ前記２列のバン
クの互いに他方より内側へオフセツトした軸端位
置に配置したことを特徴とする内燃機関のカム軸
駆動装置。1. Two rows of banks are arranged in a V shape, and two camshafts for driving intake and exhaust valves are arranged above the cylinders of each bank, and the cylinders of both banks are connected to each other by the camshafts. In an internal combustion engine that is offset in the direction of
One of the camshafts of each bank is driven by a winding transmission means between each of the camshafts and the crankshaft, and the two camshafts of each bank are driven by a winding transmission means independent of the winding transmission means. A camshaft drive device for an internal combustion engine, characterized in that the camshaft is driven by another transmission means, and each of the other transmission means is arranged at a shaft end position offset inwardly from the other of the two banks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11918584A JPS611810A (en) | 1984-06-12 | 1984-06-12 | Cam driving device in internal-combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11918584A JPS611810A (en) | 1984-06-12 | 1984-06-12 | Cam driving device in internal-combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS611810A JPS611810A (en) | 1986-01-07 |
| JPH0517362B2 true JPH0517362B2 (en) | 1993-03-09 |
Family
ID=14755011
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11918584A Granted JPS611810A (en) | 1984-06-12 | 1984-06-12 | Cam driving device in internal-combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS611810A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61275506A (en) * | 1985-05-29 | 1986-12-05 | Mazda Motor Corp | Engine cam shaft driving device |
| US5014108A (en) * | 1990-05-15 | 1991-05-07 | Harris Corporation | MESFET for dielectrically isolated integrated circuits |
| JP2829576B2 (en) * | 1995-11-28 | 1998-11-25 | マツダ株式会社 | Valve train for DOHC engine having two banks |
| JP6070231B2 (en) * | 2013-02-01 | 2017-02-01 | スズキ株式会社 | Vacuum pump mounting structure |
-
1984
- 1984-06-12 JP JP11918584A patent/JPS611810A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS611810A (en) | 1986-01-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |