JPS60243311A - Variable opening amount of valve device for four-stroke cycle engine - Google Patents

Variable opening amount of valve device for four-stroke cycle engine

Info

Publication number
JPS60243311A
JPS60243311A JP10001384A JP10001384A JPS60243311A JP S60243311 A JPS60243311 A JP S60243311A JP 10001384 A JP10001384 A JP 10001384A JP 10001384 A JP10001384 A JP 10001384A JP S60243311 A JPS60243311 A JP S60243311A
Authority
JP
Japan
Prior art keywords
valve
rocker arm
cam
rack
pivot gear
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
JP10001384A
Other languages
Japanese (ja)
Inventor
Etsuo Kato
加藤　悦夫
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 JP10001384A priority Critical patent/JPS60243311A/en
Publication of JPS60243311A publication Critical patent/JPS60243311A/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
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0021—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of rocker arm ratio

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 change the opening amount of the valve by changing the pivot point of rocker arm by providing a rack in the base end of the rocker arm which pushes the valve at its other end to open it, and by moving a pivot gear, which is meshed with the rack, in proportion to the engine speed. CONSTITUTION:As a solenoid valve 15 remains closed in a low engine speed range via an engine speed sensor 16, a hydraulic plunger 9 does not protrude, and a pivot gear 5 stays in a retracted position by a spring 8. That is, the pivot gear 5 moves the pivot point of the rocker arm 3 away from a cam 18, as it is meshed with the rack formed on the underside of the base end of the rocker arm 3. Therefore, as the camshaft 17 rotates, the rocker arm 3 rocks in a smaller stroke to cause an intake or exhaust valve 4 to open by a small amount. On the other hand, in a higher speed range, the solenoid valve 15 is opened, and the pivot gear 5 is moved forward by the hydraulic plunger 9. As a result, the pivot point of the rocker arm 3 moves closer to the cam 18, and the opening amount of the valve 1 becomes larger.

Description

【発明の詳細な説明】 〔発明の技術分野〕 この発明は、吸排気用のバルブの開ぎ量を高低速で可変
して、高低速共バランスがとれた高出力が得られるよう
にした４サイクルエンジンのバルブ開き量可変装置に関
する。[Detailed Description of the Invention] [Technical Field of the Invention] This invention provides a system in which the opening amount of the intake and exhaust valves is varied at high and low speeds to obtain high output that is well-balanced at both high and low speeds. The present invention relates to a variable valve opening amount device for a cycle engine.

〔発明の技術的背景とその問題点〕[Technical background of the invention and its problems]

４サイクルエンジンは、吸気及び排気用に傘形のバルブ
が用いられる。バルブは、バネで閉じるように付勢して
あって、クランクシャフトに連動するカムシャフトのカ
ムの回転によってバネに抗してバルブを押し開くように
なっている。従って、カムの形状によって、バルブの開
き吊と開閉タイミングが定まる。高速高出力型のエンジ
ンでは、吸排気弁のラップを大きく、開いている期間を
長くし、かつバルブのリフト量を大きくして開き量を多
くし、吸排気流れの抵抗を少くして、吸排気効率を高め
て・、出力増加を図っている。ところが、このようにし
たエンジンでは、低速では、吸気の吹抜けが多くなり、
吸気の流速も遅くなるので、渦流による燃焼効率の向上
を図ることができず、出力が低下する不都合が生じる。Four-stroke engines use umbrella-shaped valves for intake and exhaust. The valve is biased closed by a spring, and the rotation of a cam on a camshaft that is linked to the crankshaft pushes the valve open against the spring. Therefore, the opening and closing timing of the valve are determined by the shape of the cam. In high-speed, high-output engines, the intake and exhaust valves have a large wrap and open period for a long time, and the valve lift is increased to increase the amount of opening, thereby reducing the resistance of intake and exhaust flow. Efforts are being made to increase exhaust efficiency and increase output. However, with this type of engine, at low speeds, there is a lot of intake air blow-through,
Since the flow velocity of the intake air also becomes slow, it is not possible to improve the combustion efficiency due to the vortex flow, resulting in a disadvantage that the output decreases.

〔発明の目的〕[Purpose of the invention]

この発明は、かかる点に鑑み、高低速で吸排気バルブの
開き量を可変し、高低速共バランスがとれた高出力が得
られるように、簡単で安価にできる構造としたバルブ開
き量可変装置を得ることを目的とする。In view of the above, this invention has a variable valve opening amount variable device that has a simple and inexpensive structure so that the amount of opening of the intake and exhaust valves can be varied at high and low speeds, and high output balanced at both high and low speeds can be obtained. The purpose is to obtain.

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

吸気及び排気用のバルブ１は、傘形をしたもので、シリ
ンダーヘッドに嵌込まれ、バネ２で閉じるように付勢し
である。ロッカーアーム３は、先端がバルブ１の上端に
合され、基端下面にラック４が設置プである。ピボット
ギヤー５はガイド６のラック７に噛合せて転勤できるよ
うにしてあって、一方からバネ８で弾圧し、油圧プラン
ジャー９でバネ８に抗１ノで押し動かすようになってい
る。バネ受け１０がストッパー１１に当るまでピボット
ギヤー５は前進できる。ロッカーアーム３のラック４は
、ピボットギＡ７−５に噛合うように、バネ１２によっ
て押当ててあり、左右方向、前後方向には、ピン１３で
ガイド溝１４に入れて案内させである。油圧プランジャ
ー９には、エンジンに連動するオイルポンプの吐出口が
連結され、途中にソレノイドバルブ１５が設けである。The intake and exhaust valves 1 are umbrella-shaped, fitted into the cylinder head, and biased closed by a spring 2. The rocker arm 3 has a distal end aligned with the upper end of the valve 1, and a rack 4 installed on the lower surface of the proximal end. The pivot gear 5 is meshed with the rack 7 of the guide 6 so that it can be transferred, and is pressed by a spring 8 from one side and pushed by a hydraulic plunger 9 against the spring 8 by 1°. The pivot gear 5 can move forward until the spring receiver 10 hits the stopper 11. The rack 4 of the rocker arm 3 is pressed by a spring 12 so as to mesh with the pivot gear A7-5, and is guided by a pin 13 into a guide groove 14 in the left-right and front-rear directions. The hydraulic plunger 9 is connected to a discharge port of an oil pump linked to the engine, and a solenoid valve 15 is provided in the middle.

ソレノイドバルブ１５は、点火−次電流等を利用した回
転センサー１６で開閉し、低速域で閉じ、高速域で開く
ようにしである。ロッカーアーム３の上面は、クランク
シャフトに連動するカムシャフト１７のカム１８の回転
によって押下げるようになっている。The solenoid valve 15 is opened and closed by a rotation sensor 16 that uses ignition-following current, etc., and is designed to close in a low speed range and open in a high speed range. The upper surface of the rocker arm 3 is pushed down by rotation of a cam 18 of a camshaft 17 that is interlocked with the crankshaft.

低速域では、ソレノイドバルブ１５が閉じていて、油圧
プランジャー９が突出せず、ピボットギヤー５は、図示
の左側位置にある。このため、ロッカーアーム３の揺動
支点が、カム１８より遠くにあって、ロッカーアーム３
の揺動量が少く、バルブ１の開き量が少い。このため、
吸気の吹抜けが少く、バルブ１付近での吸気の流れが早
くできて渦流を起し、燃焼効率を高めて出力を増加でき
る。高速域になると、ソレノイドバルブ１５が開き、油
圧プランジャー９が前進して、ピボットギヤー５を図に
二点鎖線で示すように前進させる。In the low speed range, the solenoid valve 15 is closed, the hydraulic plunger 9 does not protrude, and the pivot gear 5 is in the left position as shown. Therefore, the swinging fulcrum of the rocker arm 3 is located further away from the cam 18, and the rocker arm 3
The amount of swinging is small, and the amount of opening of valve 1 is small. For this reason,
There is little intake air blow-through, and the intake air flows quickly near the valve 1, creating a vortex, which improves combustion efficiency and increases output. In the high speed range, the solenoid valve 15 opens, the hydraulic plunger 9 moves forward, and the pivot gear 5 moves forward as shown by the two-dot chain line in the figure.

このため、ロッカーアーム３の揺動支点がカム１８に近
ずき、ロッカーアーム３の揺動が大きく、先端の動きが
大ぎくなって、バルブ１０開ぎ損が大きくなる。したが
って、吸排気の抵抗が少くなって吸排気効率がよくなり
、多量の吸排気を短時間で出し入れして、高速出力が増
加できる。As a result, the swinging fulcrum of the rocker arm 3 approaches the cam 18, the swinging of the rocker arm 3 becomes large, the movement of the tip becomes large, and the opening loss of the valve 10 becomes large. Therefore, the resistance to intake and exhaust is reduced, the intake and exhaust efficiency is improved, and a large amount of intake and exhaust can be taken in and taken out in a short time, and high-speed output can be increased.

〔発明の効果〕〔Effect of the invention〕

以上説明したように、この発明は、先端を傘形のバルブ
の上端に当てたロッカーアームの基端にラックを設【プ
てピボットギヤーに噛合せて噛合点をロッカーアームの
支点とし、ロッカーアームの上面をカムシャフトのカム
の回転によって押下げて揺動させてバルブを開くように
し、ピボットギヤーを油圧プランジャーで進退させ、高
速域で支点をカム側に移してバルブの開き量を大きくす
るようにしたので、高低速でバルブの開き昂を可変でき
て、高低速共、バランスがとれた高出力のエンジンにで
きる。そして、ロッカーアームの支点になるピボットギ
ヤーを油圧プランジャーで進退させるので、構造も簡単
で、油圧も低圧でよく、安価にできる。As explained above, this invention provides a rack at the base end of a rocker arm whose tip is placed against the upper end of an umbrella-shaped valve, and meshes with a pivot gear to make the meshing point the fulcrum of the rocker arm. The upper surface is pushed down and swung by the rotation of the cam of the camshaft to open the valve, and the pivot gear is moved back and forth using a hydraulic plunger, and at high speeds the fulcrum is moved to the cam side to increase the opening amount of the valve. This allows the valve opening to be varied at high and low speeds, creating a well-balanced, high-output engine at both high and low speeds. Since the pivot gear, which serves as the fulcrum of the rocker arm, is moved forward and backward using a hydraulic plunger, the structure is simple, low hydraulic pressure is required, and the cost is low.

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

図は本発明の一実施例を示す縦断正面図である。 １・・・バルブ、３・・・ロッカーアーム、４・・・ラ
ック、５・・・ピボットギヤー、９・・・油圧プランジ
ャー、１７・・・カムシャフト、１８・・・カム。 出願人代理人　猪　股　清The figure is a longitudinal sectional front view showing one embodiment of the present invention. 1... Valve, 3... Rocker arm, 4... Rack, 5... Pivot gear, 9... Hydraulic plunger, 17... Camshaft, 18... Cam. Applicant's agent Kiyoshi Inomata

Claims (1)

【特許請求の範囲】[Claims] 先端を傘形のバルブの上端に当てたロッカーアームの基
端にラックを設けてピボットギヤーに噛合せて噛合点を
ロッカーアームの支点とし、ロッカーアームの上面をカ
ムシャツ１〜のカムの回転によって押下げて揺動させて
バルブを開くようにし、ピボットギψ−を油圧プランジ
ャーで進退させ、高速域で支点をカム側に移してバルブ
の開ぎ量を大ぎ＜フ゛るようにしたことを特徴とする４
サイクルエンジンのバルブ開き吊可変装置。A rack is provided at the base end of the rocker arm whose tip is placed against the upper end of the umbrella-shaped valve, and the rack is meshed with the pivot gear, the meshing point is used as the fulcrum of the rocker arm, and the top surface of the rocker arm is pushed by the rotation of the cam of cam shirt 1~. The valve is lowered and swung to open the valve, the pivot gear ψ is advanced and retreated using a hydraulic plunger, and the fulcrum is moved to the cam side in the high-speed range to increase the opening amount of the valve. 4
Variable valve opening device for cycle engines.
JP10001384A 1984-05-18 1984-05-18 Variable opening amount of valve device for four-stroke cycle engine Pending JPS60243311A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10001384A JPS60243311A (en) 1984-05-18 1984-05-18 Variable opening amount of valve device for four-stroke cycle engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10001384A JPS60243311A (en) 1984-05-18 1984-05-18 Variable opening amount of valve device for four-stroke cycle engine

Publications (1)

Publication Number Publication Date
JPS60243311A true JPS60243311A (en) 1985-12-03

Family

ID=14262667

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10001384A Pending JPS60243311A (en) 1984-05-18 1984-05-18 Variable opening amount of valve device for four-stroke cycle engine

Country Status (1)

Country Link
JP (1) JPS60243311A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002364318A (en) * 2001-06-01 2002-12-18 Aisin Seiki Co Ltd Variable valve system
ITBI20110007A1 (en) * 2011-06-09 2011-09-08 Gianni Olivari "SUCTION AND EXPULSION DEVICE REPLACING THE VALVES"

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002364318A (en) * 2001-06-01 2002-12-18 Aisin Seiki Co Ltd Variable valve system
ITBI20110007A1 (en) * 2011-06-09 2011-09-08 Gianni Olivari "SUCTION AND EXPULSION DEVICE REPLACING THE VALVES"

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