JPS60228712A - Valve operating device for four-cycle engine - Google Patents

Valve operating device for four-cycle engine

Info

Publication number
JPS60228712A
JPS60228712A JP59083371A JP8337184A JPS60228712A JP S60228712 A JPS60228712 A JP S60228712A JP 59083371 A JP59083371 A JP 59083371A JP 8337184 A JP8337184 A JP 8337184A JP S60228712 A JPS60228712 A JP S60228712A
Authority
JP
Japan
Prior art keywords
exhaust
cams
valves
intake
suction
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.)
Pending
Application number
JP59083371A
Other languages
Japanese (ja)
Inventor
Toshiya Nakada
中田　俊哉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Suzuki Motor Corp
Original Assignee
Suzuki Motor Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Suzuki Motor Corp filed Critical Suzuki Motor Corp
Priority to JP59083371A priority Critical patent/JPS60228712A/en
Publication of JPS60228712A publication Critical patent/JPS60228712A/en
Pending legal-status Critical Current

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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • 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
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • 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
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4214—Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

PURPOSE:To open and close each pair of suction valves and exhaust valves according to engine conditions, by connecting cam shafts for driving the suction valve and the exhaust valve for high speeds through centrifugal clutches to each cam shaft for low speeds. CONSTITUTION:Two suction valves and two exhaust valves are provided in each cylinder, and each of the valves is opened and closed by suction cams 4 and exhaust cams 5 interlocked with a crank shaft. There are provided centrifugal clutches 6 and 7 between the two suction cams 4 and between the two exhaust cams 5, respectively. The centrifugal clutches 6 and 7 included each two cones 10 biased by springs 9 in such a manner as to be separated from each other. When an engine is operated at high speeds, balls 8 are outwardly moved by a centrifugal force. As a result, the cones 10 act to engage meshing dogs 11 with each other. Accordingly, during low speed operation, each of one suction and exhaust valve is opened and closed, while during high speed operation, each of two suction and exhaust valves is opened and closed, thereby obtaining high torque at all times.

Description

【発明の詳細な説明】 〔発明の技術分野〕 この発明は、一つのシリンダに、２つの吸気弁と２つの
排気弁を設けた４弁型の４サイクルエンジンの動弁装置
に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a valve train for a four-valve type four-cycle engine in which one cylinder is provided with two intake valves and two exhaust valves.

〔発明の技術的背景およびその問題点〕一般に、４サイ
クルエンジンでは、クランク軸に連動する吸気カムと排
気カムを設け、回転によって吸気カムで吸気弁を押して
開き、排気カムで排気弁を押して開くようになっている
。通常は、一つのシリンダに一つの吸気弁と一つの排気
弁が設けられているが、これでは吸気弁及び排気弁の開
口面積に限界があるので、高速高出力を要求されるエン
ジンでは、一つのシリンダに２つの吸気弁と２つの排気
弁を設けて、開口面積を大きくし、高速での吸排気の流
れが対応できるようにして、出力増加を図っている。と
ころが、この４弁型エンジンでは、低速では吸気弁及び
排気弁の開口面積が大き過ぎて、吸気及び排気の流速が
遅（なり、反って出力が低下する不都合がある。[Technical background of the invention and its problems] In general, a four-stroke engine is provided with an intake cam and an exhaust cam that are linked to the crankshaft, and when rotated, the intake cam pushes the intake valve open, and the exhaust cam pushes the exhaust valve open. It looks like this. Normally, one cylinder is provided with one intake valve and one exhaust valve, but since there is a limit to the opening area of the intake valve and exhaust valve, in engines that require high speed and high output, one Two intake valves and two exhaust valves are provided in one cylinder to increase the opening area and accommodate high-speed intake and exhaust flow, thereby increasing output. However, in this four-valve engine, the opening areas of the intake valve and exhaust valve are too large at low speeds, resulting in a slow flow rate of intake and exhaust air, which causes the engine to warp and reduce output.

〔発明の目的〕[Purpose of the invention]

この発明は、かかる点に鑑み、低速では一つの　−吸気
弁と一つの排気弁を停止して、吸排気の流速を高めて出
力増加を図り、高速では４弁を用いて開口面積を増加し
て高出力が得られるように改善した４サイクルエンジン
の動弁装置を得ることを目的とする。In view of this, this invention aims to increase output by stopping one intake valve and one exhaust valve at low speeds to increase the intake and exhaust flow velocity, and at high speeds to increase the opening area by using four valves. The object of the present invention is to obtain a valve train for a four-stroke engine that is improved so that high output can be obtained.

〔発明の構成〕[Structure of the invention]

以下本発明を図面に示す実施例について説明する。 The present invention will be described below with reference to embodiments shown in the drawings.

クランク軸とタイミングベルト１で連動させた２つのカ
ム軸２，３が設けてあって、一方のカム軸２には、２つ
の吸気カム４が設けである。又、他方のカム軸３には２
つの排気カム５が設けである。２つの吸気カム４は、一
つのシリンダに設けた２つの吸気弁を各々回転によって
押し開き、２つの排気カム５は、一つのシリンダに設け
た２つの排気弁を各々回転によって押し開く。カム軸２
は、２つの吸気カム４の間で切断されていて、そこに遠
心クラッチ６を配置し、カム軸３は、２つの排気カム５
の間で切断されていて、そζに遠心クラッチ７が配置し
である。遠心クラッチ６．７は、第２図に示すように、
低速では切断しており、高速になると遠心ボール８が遠
心力で外側に飛出し、バネ９に抗してコーン１０を右側
に移動させ、噛合ドッグ１１を噛み合わせて回転を伝え
るようにしたものである。Two camshafts 2 and 3 are provided which are linked by a crankshaft and a timing belt 1, and one camshaft 2 is provided with two intake cams 4. Also, the other camshaft 3 has 2
Two exhaust cams 5 are provided. The two intake cams 4 each rotate to push open two intake valves provided in one cylinder, and the two exhaust cams 5 each rotate to push open two exhaust valves provided in one cylinder. camshaft 2
is disconnected between the two intake cams 4, and a centrifugal clutch 6 is disposed there, and the camshaft 3 is disconnected between the two exhaust cams 5.
The centrifugal clutch 7 is disposed at that point. The centrifugal clutch 6.7, as shown in FIG.
At low speeds, it cuts, and at high speeds, the centrifugal ball 8 flies out due to centrifugal force, moves the cone 10 to the right against the spring 9, and engages the dog 11 to transmit rotation. It is.

しかして、低速では、遠心クラッチ６．７が切れている
ので、右側の吸気カム４と右側の排気カム５は停止して
おり、左側の吸気カム４と左側の排気カム５だけ回転し
ている。従って、２つの吸気弁と２つの排気弁のうち、
一つの吸気弁と一つの排気弁だけ開閉し、開口面積を少
くすることによって、吸気及び排気の流速を高め、低速
での出方向上が図れると共に燃料消費も少くできる。高
速になると、遠心クラッチ６．７の接続によって、２つ
の吸気カム４．２つの排気カム５が回転し、２つの吸気
弁、２つの排気弁が開閉して４弁共開閉し、開口面積を
増して、吸排気を高速に追従できるようにし、高速の出
方向上を図ることができる。However, at low speeds, the centrifugal clutches 6 and 7 are disengaged, so the right intake cam 4 and the right exhaust cam 5 are stopped, and only the left intake cam 4 and the left exhaust cam 5 are rotating. . Therefore, among the two intake valves and two exhaust valves,
By opening and closing only one intake valve and one exhaust valve and reducing the opening area, the flow velocity of intake and exhaust air can be increased, the output direction can be improved at low speeds, and fuel consumption can be reduced. When the speed increases, the two intake cams 4 and the two exhaust cams 5 rotate by connecting the centrifugal clutches 6 and 7, and the two intake valves and two exhaust valves open and close, and all four valves open and close, reducing the opening area. In addition, it is possible to follow the intake and exhaust air at high speed, and it is possible to aim for a high-speed output direction.

〔発明の効果〕〔Effect of the invention〕

以上説明したように、この発明は、一つのシリンダに２
つの吸気弁と２つの排気弁を設けた４弁エンジンに於て
、各吸気弁と排気弁をクランク軸に連動する２つの吸気
カムと２つの排気カムの回転によって押下げて開くよう
にし、２つの吸気カムと２つの排気カムの間に遠心クラ
ッチを装着し、低速では一つの吸気カムと一つの排気カ
ムを回転させ、高速で２つの吸気カムと２つの排気カム
を回転させるようにしたので、低速では、２つの吸気弁
と排気弁のうち一方を休ませて、開口面積を少くし、吸
排気の流速を高めて、低速での出力増加を図れ、燃料も
節約できる。一方高速では、遠心クラッチの接続によっ
て４弁共開閉するので、開口面積を増し、高速の吸排気
流れが追従できるので、高出力が得られる。こうして、
高低速共用力が高いエンジンにできる。又、低回転では
、半分休止しているのでメカニカルロスも少い。As explained above, this invention provides two cylinders in one cylinder.
In a four-valve engine equipped with one intake valve and two exhaust valves, each intake valve and exhaust valve are pushed down and opened by the rotation of two intake cams and two exhaust cams that are linked to the crankshaft. A centrifugal clutch is installed between two intake cams and two exhaust cams, so that one intake cam and one exhaust cam rotate at low speeds, and two intake cams and two exhaust cams rotate at high speeds. At low speeds, one of the two intake and exhaust valves is rested, reducing the opening area and increasing the intake and exhaust flow velocity, increasing output at low speeds and saving fuel. On the other hand, at high speeds, the centrifugal clutch is connected to open and close all four valves, increasing the opening area and allowing high-speed intake and exhaust flow to follow, resulting in high output. thus,
The engine can be made to have high performance both at high and low speeds. Also, at low revolutions, half of the engine is at rest, so there is less mechanical loss.

【図面の簡単な説明】[Brief explanation of drawings]

図は本発明の一実施例を示し、第１図は平面図、第２図
は第１図Ａ及びＢ矢示部の拡大縦断面図である。 ４・・・吸気カム、５・・・排気カム、６・・・遠心ク
ラッチ、７・・・遠心クラッチ。 出　願　人　代理人　猪　股　清The drawings show an embodiment of the present invention, with FIG. 1 being a plan view and FIG. 2 being an enlarged vertical cross-sectional view of the portion indicated by arrows A and B in FIG. 4... Intake cam, 5... Exhaust cam, 6... Centrifugal clutch, 7... Centrifugal clutch. Applicant Agent Kiyoshi Inomata

Claims (1)

【特許請求の範囲】[Claims] １、　一つのシリンダに２つの吸気弁と２つの排気弁を
設けた４弁エンジンに於て、各吸気弁と排気弁をクラン
ク軸に連動する２つの吸気カムと２つの排気カムの回転
によって押下げて開くようにし、２つの吸気カムと２つ
の排気カムの間に遠心クラッチを装着し、低速では一つ
の吸気カムと一つの排気カムを回転させ、高速で二つの
吸気カムと二つの排気カムを回転させるようにしたこと
を特徴とする４サイクルエンジンの動弁装置。1. In a four-valve engine with two intake valves and two exhaust valves in one cylinder, each intake valve and exhaust valve are pushed by the rotation of two intake cams and two exhaust cams that are linked to the crankshaft. A centrifugal clutch is installed between the two intake cams and two exhaust cams, and at low speeds, one intake cam and one exhaust cam are rotated, and at high speeds, two intake cams and two exhaust cams are rotated. A valve train for a four-stroke engine, characterized in that it rotates.
JP59083371A 1984-04-25 1984-04-25 Valve operating device for four-cycle engine Pending JPS60228712A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59083371A JPS60228712A (en) 1984-04-25 1984-04-25 Valve operating device for four-cycle engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59083371A JPS60228712A (en) 1984-04-25 1984-04-25 Valve operating device for four-cycle engine

Publications (1)

Publication Number Publication Date
JPS60228712A true JPS60228712A (en) 1985-11-14

Family

ID=13800559

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59083371A Pending JPS60228712A (en) 1984-04-25 1984-04-25 Valve operating device for four-cycle engine

Country Status (1)

Country Link
JP (1) JPS60228712A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007239704A (en) * 2006-03-10 2007-09-20 Mazda Motor Corp Variable valve gear for engine
JP2010043554A (en) * 2008-08-08 2010-02-25 Honda Motor Co Ltd Variable valve gear for internal combustion engine
KR101039938B1 (en) 2004-12-18 2011-06-09 현대자동차주식회사 cylinder deactivation system of engine
US8807102B2 (en) 2009-09-14 2014-08-19 Honda Motor Co., Ltd Variable valve operating device for internal combustion engine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101039938B1 (en) 2004-12-18 2011-06-09 현대자동차주식회사 cylinder deactivation system of engine
JP2007239704A (en) * 2006-03-10 2007-09-20 Mazda Motor Corp Variable valve gear for engine
JP4573217B2 (en) * 2006-03-10 2010-11-04 マツダ株式会社 Variable valve gear for engine
JP2010043554A (en) * 2008-08-08 2010-02-25 Honda Motor Co Ltd Variable valve gear for internal combustion engine
US8807102B2 (en) 2009-09-14 2014-08-19 Honda Motor Co., Ltd Variable valve operating device for internal combustion engine

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