JPH0243001B2 - - Google Patents
Info
- Publication number
- JPH0243001B2 JPH0243001B2 JP55128909A JP12890980A JPH0243001B2 JP H0243001 B2 JPH0243001 B2 JP H0243001B2 JP 55128909 A JP55128909 A JP 55128909A JP 12890980 A JP12890980 A JP 12890980A JP H0243001 B2 JPH0243001 B2 JP H0243001B2
- Authority
- JP
- Japan
- Prior art keywords
- power transmission
- engine
- crankshaft
- camshaft
- transmission member
- 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 32
- 238000004804 winding Methods 0.000 claims description 5
- 239000000428 dust Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 239000011796 hollow space material Substances 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
- F01L1/022—Chain 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
- 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
- F01L1/026—Gear 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
- F02B2275/08—Endless member is a chain
-
- 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]
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】
〔産業上の利用分野〕
本発明は、シリンダヘツドに吸気カム軸と排気
カム軸とを個別に設けた、いわゆるダブルオーバ
ーヘツドカム式エンジンの動弁カム軸駆動装置に
関するものである。Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a valve train camshaft drive device for a so-called double overhead cam type engine in which an intake camshaft and an exhaust camshaft are separately provided in the cylinder head. It is something.
この種のエンジンにおいては、シリンダヘツド
に設けられた動弁カム軸とクランク軸とは距離が
隔たつているので、一般にチエーンや歯付ベルト
などの動力伝達手段を介して連結されることが多
い。
In this type of engine, the valve drive camshaft installed in the cylinder head and the crankshaft are separated by a distance, so they are generally connected via a power transmission means such as a chain or toothed belt. .
従来、ダブルオーバーヘツドカム式のエンジン
では多くの場合、２本のカム軸とクランク軸との
三軸を外部に突出させ、これらにスプロケツトを
介してタイミングチエーンを掛け渡して駆動する
ことが多く行われている。 Traditionally, double overhead cam type engines often have three axles, two camshafts and a crankshaft, that protrude to the outside, and are often driven by a timing chain that spans these through a sprocket. It is being said.
しかし、このように動力伝達手段をエンジンの
外側に配設すると、動力伝達手段を構成する部材
類が雨水や塵埃などから保護できなくなる不都合
が起きる。そこで、本願出願人が特開昭54−
50718号で提案したように、タイミングチエーン
類をヘツドカバー、シリンダヘツド、シリンダブ
ロツクおよびケースで覆うことも考えられる。
However, when the power transmission means is disposed outside the engine in this way, there is a problem that the members constituting the power transmission means cannot be protected from rainwater, dust, and the like. Therefore, the applicant of the present application
It is also conceivable to cover the timing chains with a head cover, cylinder head, cylinder block and case, as proposed in No. 50718.
しかし、このような構造では、タイミングチエ
ーンがクランク軸方向から見て、エンジン上部に
おいて大きな幅を有する略逆三角形状に掛け渡さ
れているために、特にエンジンの上部が大型化し
てしまうという不具合があつた。また、クランク
室におけるクランク軸方向の長さも長くなり、同
方向にクランクケースが大型化するために、自動
二輪車に搭載した場合、バンク角を大きくとるこ
とができないという不具合も起きる。 However, with this structure, the timing chain spans the upper part of the engine in an almost inverted triangular shape with a large width when viewed from the crankshaft direction, so there is a problem that the upper part of the engine becomes particularly large. It was hot. Furthermore, the length of the crank chamber in the direction of the crankshaft becomes longer, and the crankcase becomes larger in the same direction, resulting in the problem that a large bank angle cannot be achieved when mounted on a motorcycle.
本発明はこのような事情に鑑みなされたもの
で、エンジンの大型化を招くことなく動弁カム軸
を駆動する動力伝達手段類を保護することができ
るエンジンの動弁カム軸駆動装置を提供するもの
である。 The present invention has been made in view of the above circumstances, and provides an engine valve camshaft drive device that can protect the power transmission means for driving the valve camshaft without increasing the size of the engine. It is something.
本発明に係る動弁カム軸駆動装置は、吸・排気
カム軸とクランク軸との間を駆動連結する動力伝
達手段をシリンダヘツドとシリンダブロツク内に
内蔵すると共に、前記動力伝達手段を、前記吸・
排気カム軸およびこれら両カム軸の中間であつて
これよりも下方に配設した中間軸との三軸にそれ
ぞれ軸装した動力伝達部材と、前記中間軸上の動
力伝達部材と一体をなす従動スプロケツトとクラ
ンク軸とを連結する巻き掛け伝動部材とで構成
し、この巻き掛け伝動部材と前記従動スプロケツ
トとを前記動力伝達部材より内側に配設したもの
である。
A valve train camshaft drive device according to the present invention incorporates a power transmission means for drivingly connecting an intake/exhaust camshaft and a crankshaft in a cylinder head and a cylinder block, and also includes a power transmission means that drives and connects an intake/exhaust camshaft and a crankshaft.・
an exhaust camshaft and an intermediate shaft located between and below these camshafts; a power transmission member mounted on each of the three shafts; and a driven unit integral with the power transmission member on the intermediate shaft. It is composed of a winding transmission member that connects a sprocket and a crankshaft, and the winding transmission member and the driven sprocket are arranged inside the power transmission member.
本発明においては、クランク軸の回転を中間軸
上の従動スプロケツトへ伝達する巻き掛け伝動部
材が、幅狭となりかつ内側寄りに配設されてシリ
ンダブロツクで覆われる。
In the present invention, the wrap-around transmission member that transmits the rotation of the crankshaft to the driven sprocket on the intermediate shaft has a narrow width, is disposed inwardly, and is covered with a cylinder block.
以下、本発明の一実施例を図により詳細に説明
する。第１図は本発明に係るエンジンの動弁カム
軸駆動装置を示す断面図、第２図は第１図の−
線断面図、第３図は第２図の−線断面図で
ある。第２図および第３図において、符号１で示
すものはエンジンであり、このエンジン１のシリ
ンダブロツク１Ａ上のシリンダヘツド２には、吸
気カム軸３と排気カム軸４とが軸受部５によつて
それぞれ個別に軸支されている。２Ａはヘツドカ
バー、６は動弁カムである。
Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. Fig. 1 is a sectional view showing a valve train camshaft drive device for an engine according to the present invention, and Fig. 2 is a -
3 is a sectional view taken along the - line in FIG. 2. In FIGS. 2 and 3, the reference numeral 1 indicates an engine, and an intake camshaft 3 and an exhaust camshaft 4 are mounted on a cylinder head 2 on a cylinder block 1A of the engine 1 through bearings 5. They are each supported individually. 2A is a head cover, and 6 is a valve drive cam.
吸気カム軸３の外端部には吸気カムギヤ７が固
定され、また、排気カム軸４の外端部には排気カ
ムギヤ８が固定されている。これらの両カムギヤ
７，８は、これらとともに動力伝達部材を構成す
るアイドルギヤ９を介して互いに駆動連結されて
いる。このアイドルギヤ９の内側すなわち燃焼室
寄りには、従動スプロケツト１１が一体的に設け
られ、シリンダヘツド２に支持された中間軸１２
によつて回転自在に軸支されている。ここで、中
間軸１２は、アイドルギヤ９が両ギヤ７，８の中
間であつて両ギヤ７，８よりも下方に位置するよ
うにその支持位置が設定されている。１３は中間
軸１２の抜け止め用プラグである。 An intake cam gear 7 is fixed to the outer end of the intake camshaft 3, and an exhaust cam gear 8 is fixed to the outer end of the exhaust camshaft 4. Both of these cam gears 7 and 8 are drivingly connected to each other via an idle gear 9 that together constitutes a power transmission member. A driven sprocket 11 is integrally provided inside the idle gear 9, that is, closer to the combustion chamber, and an intermediate shaft 12 supported by the cylinder head 2.
It is rotatably supported by. Here, the support position of the intermediate shaft 12 is set such that the idle gear 9 is located between the two gears 7 and 8 and below both the gears 7 and 8. 13 is a plug for preventing the intermediate shaft 12 from coming off.
１４は巻き掛け伝動部材としての歯付ベルトで
ある。この歯付ベルト１４は、前記従動スプロケ
ツト１１とクランク軸１５に固設された駆動スプ
ロケツト１６との間に巻き掛けれてアイドルギヤ
９とクランク軸１５とを連結している。また、歯
付ベルト１４は従動スプロケツト１１がアイドル
ギヤ９の内側に設けられているので、アイドルギ
ヤ９よりも燃焼室側すなわちシリンダ孔寄りに配
設されており、シリンダヘツド２およびシリンダ
ブロツク１Ａなどからなるエンジン内に形成され
た中空部内に収容されている。すなわち、歯付ベ
ルト１４はエンジンブロツク内に内蔵されている
ことになる。１７は歯付ベルト１４のテンシヨナ
である。 14 is a toothed belt as a winding transmission member. This toothed belt 14 is wound between the driven sprocket 11 and a drive sprocket 16 fixedly attached to the crankshaft 15 to connect the idle gear 9 and the crankshaft 15. Further, since the driven sprocket 11 is provided inside the idle gear 9, the toothed belt 14 is arranged closer to the combustion chamber than the idle gear 9, that is, closer to the cylinder hole, and is attached to the cylinder head 2, cylinder block 1A, etc. The engine is housed in a hollow space formed within the engine. That is, the toothed belt 14 is built into the engine block. 17 is a tensioner for the toothed belt 14.
このように構成された動弁カム軸駆動装置は、
クランク軸１５が反時計方向へ回転すると、この
回転が歯付ベルト１４によつて従動スプロケツト
１１へ伝達され、この従動スプロケツト１１およ
びこれと一体をなすアイドルギヤ９は同方向へ回
転する。そして、アイドルギヤ９と噛合している
吸気カムギヤ７および排気カムギヤ８を介して吸
気カム軸３および排気カム軸４が時計方向へ回転
する。 The valve train camshaft drive device configured in this way is
When the crankshaft 15 rotates counterclockwise, this rotation is transmitted to the driven sprocket 11 by the toothed belt 14, and the driven sprocket 11 and the idle gear 9 integral therewith rotate in the same direction. Then, the intake camshaft 3 and the exhaust camshaft 4 rotate clockwise via the intake cam gear 7 and the exhaust cam gear 8 which are meshed with the idle gear 9.
また、歯付ベルト１４はクランク軸１５の回転
をアイドルギヤ９へ伝達すればよくなるから、歯
付ベルト１４をエンジン中央寄りに配設すること
ができる。このため、歯付ベルト１４をクランク
軸の軸線方向から見てエンジンシリンダよりも側
方へ突出しないように小型化される。さらに、こ
の歯付ベルト１４をエンジン内に内蔵しているか
ら、歯付ベルト１４がシリンダヘツドないしシリ
ンダブロツクで覆われ雨水や塵埃などから保護さ
れる。 Moreover, since the toothed belt 14 only needs to transmit the rotation of the crankshaft 15 to the idle gear 9, the toothed belt 14 can be disposed closer to the center of the engine. Therefore, the toothed belt 14 is miniaturized so that it does not protrude laterally than the engine cylinder when viewed from the axial direction of the crankshaft. Furthermore, since the toothed belt 14 is built into the engine, the toothed belt 14 is covered by the cylinder head or cylinder block and is protected from rainwater and dust.
ここで、上述したように、歯付ベルト１４がク
ランク軸の軸線方向からみて幅狭に形成されると
ともに、吸気カムギヤ７、排気カムギヤ８および
アイドルギヤ９より内側に位置しているので、こ
のように歯付ベルト１４をシリンダヘツドないし
シリンダブロツクで保護する構造としてもシリン
ダブロツクないしクランクケースが大型化するの
抑えることができる。 Here, as described above, since the toothed belt 14 is formed to have a narrow width when viewed from the axial direction of the crankshaft and is located inside the intake cam gear 7, the exhaust cam gear 8, and the idle gear 9, A structure in which the toothed belt 14 is protected by a cylinder head or cylinder block can also prevent the cylinder block or crankcase from increasing in size.
〔発明の効果〕
以上説明したように本発明によれば、吸・排気
カム軸とクランク軸との間を駆動連結する動力伝
達手段をシリンダヘツドとシリンダブロツク内に
内蔵すると共に、前記動力伝達手段を、前記吸・
排気カム軸およびこれら両カム軸の中間であつて
これよりも下方に配設した中間軸との三軸にそれ
ぞれ軸装した動力伝達部材と、前記中間軸上の動
力伝達部材と一体をなす従動スプロケツトとクラ
ンク軸とを連結する巻き掛け伝動部材とで構成
し、この巻き掛け伝動部材と前記従動スプロケツ
トとを前記動力伝達部材より内側に配設したか
ら、巻き掛け伝動部材をエンジンシリンダ中心寄
りに配設することができ、動力伝達手段全体をシ
リンダヘツドないしシリンダブロツクで覆うこと
ができるとともに、エンジンシリンダ部分の小型
化がはかれる。[Effects of the Invention] As explained above, according to the present invention, the power transmission means for drivingly connecting the intake/exhaust camshaft and the crankshaft is built into the cylinder head and the cylinder block, and the power transmission means The above-mentioned suction
an exhaust camshaft and an intermediate shaft located between and below these camshafts; a power transmission member mounted on each of the three shafts; and a driven unit integral with the power transmission member on the intermediate shaft. It is composed of a wrapped transmission member that connects the sprocket and the crankshaft, and since this wrapped transmission member and the driven sprocket are arranged inside the power transmission member, the wrapped transmission member can be moved closer to the center of the engine cylinder. The entire power transmission means can be covered with a cylinder head or cylinder block, and the engine cylinder portion can be made smaller.
したがつて、動力伝達部材を雨水や塵埃などか
ら保護することができるだけでなく、巻き掛け伝
動部材を小型化することができるから、動力伝達
手段をエンジン内に内蔵し保護する構造としても
エンジンが大型化するのを抑えることができる。
また、クランクケースをクランク軸方向に幅狭に
形成できるから、エンジンを自動二輪車に搭載し
た場合、バンク角を大きくとることができる。 Therefore, not only can the power transmission member be protected from rainwater and dust, but also the wrap-around transmission member can be made smaller, so the engine can be built into a structure that protects the power transmission means within the engine. It is possible to suppress the increase in size.
Furthermore, since the crankcase can be formed narrowly in the direction of the crankshaft, a large bank angle can be achieved when the engine is mounted on a motorcycle.
第１図は本発明に係るエンジンの動弁カム軸駆
動装置を示す断面図、第２図は第１図の−断
面図、第３図は第２図の−線断面図である。
１Ａ…シリンダブロツク、２…シリンダヘツ
ド、３…吸気カム軸、４…排気カム軸、７…吸気
カムギヤ、８…排気カムギヤ、９…アイドルギ
ヤ、１２…中間軸、１４…歯付ベルト、１５…ク
ランク軸。
FIG. 1 is a cross-sectional view showing a valve train camshaft drive device for an engine according to the present invention, FIG. 2 is a cross-sectional view taken along the line -- in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line -- in FIG. 1A...Cylinder block, 2...Cylinder head, 3...Intake camshaft, 4...Exhaust camshaft, 7...Intake cam gear, 8...Exhaust cam gear, 9...Idle gear, 12...Intermediate shaft, 14...Toothed belt, 15... crankshaft.
Claims (1)
軸４とを個別に設け、これら両カム軸３，４とク
ランク軸１５との間を駆動連結する動力伝達手段
をシリンダヘツド２とシリンダブロツク１Ａ内に
内蔵してなり、 前記動力伝達手段を、前記吸・排気カム軸３，
４およびこれら両カム軸３，４の中間であつてこ
れよりも下方に配設した中間軸１２との三軸にそ
れぞれ軸装した動力伝達部材７，８，９と、前記
中間軸１２上の動力伝達部材９と一体をなす従動
スプロケツト１１とクランク軸１５とを連結する
巻き掛け伝動部材１４とで構成し、 この巻き掛け伝動部材１４と前記従動スプロケ
ツト１１とを前記動力伝達部材７，８，９より内
側に配設したことを特徴とするエンジンの動弁カ
ム軸駆動装置。[Scope of Claims] 1. An intake camshaft 3 and an exhaust camshaft 4 are separately provided in the cylinder head 2, and a power transmission means for drivingly connecting these camshafts 3, 4 and a crankshaft 15 is provided in the cylinder head. 2 and built into the cylinder block 1A, the power transmission means is connected to the intake/exhaust camshaft 3,
4 and an intermediate shaft 12 disposed between and below these camshafts 3, 4; It is composed of a driven sprocket 11 that is integral with the power transmission member 9 and a winding transmission member 14 that connects the crankshaft 15, and the winding transmission member 14 and the driven sprocket 11 are connected to the power transmission members 7, 8, 9. A valve train camshaft drive device for an engine, characterized in that the drive device is disposed inside the engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12890980A JPS5752609A (en) | 1980-09-16 | 1980-09-16 | Cam shaft driving device for moving valve in engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12890980A JPS5752609A (en) | 1980-09-16 | 1980-09-16 | Cam shaft driving device for moving valve in engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5752609A JPS5752609A (en) | 1982-03-29 |
| JPH0243001B2 true JPH0243001B2 (en) | 1990-09-26 |
Family
ID=14996354
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12890980A Granted JPS5752609A (en) | 1980-09-16 | 1980-09-16 | Cam shaft driving device for moving valve in engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5752609A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5974312A (en) * | 1982-10-20 | 1984-04-26 | Honda Motor Co Ltd | Valve operating device for engine |
| JPS5996307U (en) * | 1982-12-21 | 1984-06-29 | 本田技研工業株式会社 | Cam drive idle gear shaft fixing device |
| JP2527420B2 (en) * | 1983-08-31 | 1996-08-21 | マツダ株式会社 | Camshaft drive |
| US6782859B2 (en) * | 2000-11-16 | 2004-08-31 | Honda Giken Kogyo Kabushiki Kaisha | Valve system for OHV-type four-cylinder internal combustion engine |
| DE102004018263A1 (en) * | 2004-04-15 | 2005-11-24 | Bayerische Motoren Werke Ag | Method for compensating for play in camshaft drive especially in IC engine has the camshaft drive wheel mounting close to the camshafts and with temperature compensation |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3540420A (en) * | 1968-12-27 | 1970-11-17 | Avco Corp | Module-type engine structure |
| JPS5345849A (en) * | 1976-10-05 | 1978-04-25 | Tomita Takahashi | Folding structure of truck handle |
| JPS5450718A (en) * | 1977-09-29 | 1979-04-20 | Yamaha Motor Co Ltd | V-type or horizontally opposed type four cycle engine for motorcycle |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS528710U (en) * | 1975-07-08 | 1977-01-21 |
-
1980
- 1980-09-16 JP JP12890980A patent/JPS5752609A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3540420A (en) * | 1968-12-27 | 1970-11-17 | Avco Corp | Module-type engine structure |
| JPS5345849A (en) * | 1976-10-05 | 1978-04-25 | Tomita Takahashi | Folding structure of truck handle |
| JPS5450718A (en) * | 1977-09-29 | 1979-04-20 | Yamaha Motor Co Ltd | V-type or horizontally opposed type four cycle engine for motorcycle |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5752609A (en) | 1982-03-29 |
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