JPS6318728Y2 - - Google Patents
Info
- Publication number
- JPS6318728Y2 JPS6318728Y2 JP5105082U JP5105082U JPS6318728Y2 JP S6318728 Y2 JPS6318728 Y2 JP S6318728Y2 JP 5105082 U JP5105082 U JP 5105082U JP 5105082 U JP5105082 U JP 5105082U JP S6318728 Y2 JPS6318728 Y2 JP S6318728Y2
- Authority
- JP
- Japan
- Prior art keywords
- lever
- valve
- rocker arm
- intake
- cam
- 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
Links
- 238000002485 combustion reaction Methods 0.000 claims description 2
- 238000005452 bending Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
- Valve Device For Special Equipments (AREA)
Description
【考案の詳細な説明】
この考案は吸排気弁の開閉時期ならびに弁リフ
ト量を運転条件に応じて可変制御する内燃機関の
吸排気弁駆動装置に関する。[Detailed Description of the Invention] This invention relates to an intake/exhaust valve drive device for an internal combustion engine that variably controls the opening/closing timing and valve lift amount of intake/exhaust valves according to operating conditions.
パルプオーバーラツプや新気充填効率等が常に
最適に得られるように吸排気弁の開閉時期ならび
に弁リフト量を機関の運転条件に応じて可変制御
する吸排気弁駆動装置は、従来から種々提案され
ているが、その一つとして第１図に示す米国特許
第3413965号が知られている。 Various intake and exhaust valve drive devices have been proposed in the past, which variably control the opening/closing timing of the intake and exhaust valves and the amount of valve lift according to engine operating conditions so that pulp overlap and fresh air filling efficiency are always optimal. One such example is US Pat. No. 3,413,965 shown in FIG.
この弁駆動装置は、バルブ駆動カム１に一端が
当接し、かつ他端が吸排気弁２のステムエンドに
嵌合支持されたロツカアーム３の左右が揺動する
ことによつて、カム１のリフトが吸排気弁２に伝
達されるもので、特に上記レバー５はその一端で
回動可能に軸支されており、その傾斜が制御カム
６によつて規制されるように構成されている。そ
して、上記制御カム６は、例えば油圧アクチユエ
ータ等の駆動機構により機関運転条件に応じて適
宜な位相に回転駆動され、これによつて吸排気弁
２の開閉タイミングおよびリフト量が可変制御さ
れる。すなわち、例えば制御カム６によるレバー
５の押し下げ量が大であれば、バルブ駆動カム１
のベースサークル状態においてレバー５の自由端
部とロツカアーム３とが近接しており、従つて吸
排気弁２の開弁時期が早まるとともにバルブリフ
ト量が大となり、また制御カム６による押し下げ
量が小であれば、同じバルブ駆動カム１のベース
サークル状態であつてもレバー５の自由端部とロ
ツカアーム３とが離間しており、従つて吸排気弁
の開弁時期が遅れるとともにバルブリフト量が小
となるのである。 This valve drive device lifts the cam 1 by swinging the right and left sides of a rocker arm 3 whose one end abuts the valve drive cam 1 and whose other end is fitted and supported by the stem end of the intake/exhaust valve 2. is transmitted to the intake and exhaust valves 2. In particular, the lever 5 is pivotably supported at one end thereof, and its inclination is regulated by a control cam 6. The control cam 6 is rotationally driven in an appropriate phase according to engine operating conditions by a drive mechanism such as a hydraulic actuator, thereby variably controlling the opening/closing timing and lift amount of the intake/exhaust valve 2. That is, for example, if the amount of depression of the lever 5 by the control cam 6 is large, the valve drive cam 1
In the base circle state, the free end of the lever 5 and the rocker arm 3 are close to each other, so the opening timing of the intake and exhaust valves 2 is advanced, the valve lift amount is large, and the amount of depression by the control cam 6 is small. If so, even if the same valve drive cam 1 is in the base circle state, the free end of the lever 5 and the rocker arm 3 are separated, and therefore the opening timing of the intake and exhaust valves is delayed and the amount of valve lift is small. It becomes.
しかしながら、このような従来の吸排気弁駆動
装置にあつては、ロツカアーム３が駆動カム１に
よつてスラスト方向の作用力を受けるため、吸排
気弁２のバルブステム２ａに強い曲げ応力が作用
し、バルブステム２ａのガイド部の異常摩耗やバ
ルブステム２ａの切損を招くなどの問題点があつ
た。 However, in such a conventional intake/exhaust valve drive device, since the rocker arm 3 receives a force acting in the thrust direction from the drive cam 1, strong bending stress acts on the valve stem 2a of the intake/exhaust valve 2. However, there were problems such as abnormal wear of the guide portion of the valve stem 2a and breakage of the valve stem 2a.
本考案はかかる従来の問題点に着目してなされ
たもので、ロツカアーム背面の略中央部およびバ
ルブステム側端部に凹部を設け、これら凹部間の
ロツカアーム背面にレバーの表面を支点接触させ
るとともに、その表面両側に設けた凸部を前記凹
部に嵌合させることによつて、駆動カムから受け
けるロツカアームのスラスト力を前記レバーによ
つて支える構成としたことにより、バルブステム
やこれのガイド部の摩耗やバルブステムの切損を
未然に防止するようにした吸排気弁駆動装置を提
供するものである。 The present invention has been developed by focusing on such conventional problems, and includes providing a concave portion approximately in the center of the rear surface of the rocker arm and the end on the valve stem side, and bringing the surface of the lever into fulcrum contact with the rear surface of the rocker arm between these recesses. By fitting the convex parts provided on both sides of the surface into the concave parts, the thrust force of the rocker arm received from the drive cam is supported by the lever, so that the valve stem and its guide part are An object of the present invention is to provide an intake/exhaust valve drive device that prevents wear and valve stem breakage.
以下に、本考案の実施例を図面について説明す
る。 Embodiments of the present invention will be described below with reference to the drawings.
第２図および第３図は吸排気弁駆動装置を具体
的に示すものである。１１は機関回転に同期して
回転するバルブ駆動カム、１２は吸排気弁、１３
はロツカアームで、このロツカアーム１３背面の
ほぼ中央部とバルブステム１２ａ方向の端部には
嵌合部としての円弧状の凹部１３ａ，１３ｂが設
けられている。また、この凹部１３ａ，１３ｂ間
のロツカアーム１３背面は連続した緩やかな凸曲
面１４となつている。１５は前記ロツカアーム１
３の凸曲面に前面が支点接触されたレバーで、そ
の前面両端に突設された被嵌合部としての円弧状
の凸部１５ａ，１５ｂが前記凹部１３ａ，１３ｂ
にそれぞれ嵌合されている。なお、この凸部１５
ａ，１５ｂ間は前記凸曲面１４に支点接触する直
線的支持面１６となつている。なお、前記凸曲面
１４は支点接触点の移動を滑らかにし、バルブリ
フトおよび着座の緩衝機能を高めるように作用す
る。 FIGS. 2 and 3 specifically show the intake and exhaust valve drive device. 11 is a valve drive cam that rotates in synchronization with engine rotation; 12 is an intake and exhaust valve; 13
1 is a rocker arm, and arc-shaped recesses 13a and 13b as fitting portions are provided at approximately the center of the back surface of the rocker arm 13 and at the end toward the valve stem 12a. Further, the back surface of the rocker arm 13 between the recesses 13a and 13b forms a continuous, gently convex curved surface 14. 15 is the rocker arm 1
The lever has a front surface in fulcrum contact with the convex curved surface of No. 3, and arc-shaped convex portions 15a and 15b as fitted portions protruding from both ends of the front surface are connected to the concave portions 13a and 13b.
are mated to each other. Note that this convex portion 15
The space between a and 15b is a linear support surface 16 that makes fulcrum contact with the convex curved surface 14. Note that the convex curved surface 14 functions to smooth the movement of the fulcrum contact point and enhance the valve lift and seating cushioning function.
一方、前記レバー１５のバルブステム側端には
Ｕ字溝１５ｃが形成され、このＵ字溝１５ｃ内に
はアジヤスタボルト１７ａが植設され、これに前
記シヤフト１７の略中央部が貫通していて、その
アジヤスタボルト１７ａに螺合したロツクナイト
１７ｂにより、バルブステム１２ａとロツカアー
ム１３のクリアランスすなわちバルブクリアラン
スを調整できるようになつている。 On the other hand, a U-shaped groove 15c is formed at the end of the lever 15 on the valve stem side, and an adjuster bolt 17a is installed in this U-shaped groove 15c, and a substantially central portion of the shaft 17 passes through this. The clearance between the valve stem 12a and the rocker arm 13, that is, the valve clearance, can be adjusted by a lockite 17b screwed onto the adjuster bolt 17a.
また前記レバー１５の前面両側には、ガイド片
１５ｂが一体に突設され、これらのガイド片１５
ｂ間にロツカアーム１３の前記凸曲面１４を含む
背面部分が介在され、ロツカアーム１３のレバー
１５に対する横ずれを防止している。 Further, guide pieces 15b are integrally provided on both sides of the front surface of the lever 15, and these guide pieces 15
A rear surface portion of the rocker arm 13 including the convex curved surface 14 is interposed between the rocker arm b and the rocker arm 13 to prevent the rocker arm 13 from shifting laterally with respect to the lever 15.
前記レバー１５の背面１８にはシヤフト２０に
固設された制御カム１９が当接しており、前記シ
ヤフト２０の一端には機関の運転状態に応じて行
動するシヤフト駆動装置２１が繋がれている。 A control cam 19 fixed to a shaft 20 is in contact with the back surface 18 of the lever 15, and a shaft drive device 21 that operates according to the operating state of the engine is connected to one end of the shaft 20.
さらに、前記シヤフト１７には２つのコイルス
プリング２２，２２の各一端が固定され、各他端
がロツカアーム１３およびレバー１５にそれぞれ
固定され、ロツカアーム１３を駆動カム側に付勢
するとともにレバー１５を制御カム１９側に付勢
している。 Further, one end of each of two coil springs 22, 22 is fixed to the shaft 17, and the other ends are fixed to the rocker arm 13 and the lever 15, respectively, which bias the rocker arm 13 toward the drive cam side and control the lever 15. It is biased toward the cam 19 side.
次に、前記構成に基づく作用について説明す
る。先ず、シヤフト駆動装置２１によつて制御カ
ム１９が回転し、レバー１５を押し下げた場合に
は第４図に示す如くなる。 Next, the effects based on the above configuration will be explained. First, when the control cam 19 is rotated by the shaft drive device 21 and the lever 15 is pushed down, the state becomes as shown in FIG.
かかる状態において、バルブ駆動カム１１がロ
ツカアーム１３をリフトさせると、ロツカアーム
１３の背面の凸曲面１４とレバー１５の直線的支
持面との支点接触点Ａは、前記リフトに応じて凹
部１３ａ側に移動し、最後に凹部１３ａと凸部１
５ａを支点として揺動し、吸排気弁１２を押し開
く。この場合の押し開きによるバルブリフト量は
大きくＬとなる。 In this state, when the valve driving cam 11 lifts the rocker arm 13, the fulcrum contact point A between the convex curved surface 14 on the back surface of the rocker arm 13 and the linear support surface of the lever 15 moves toward the recess 13a in accordance with the lift. Finally, the concave portion 13a and the convex portion 1
It swings about 5a as a fulcrum and pushes open the intake and exhaust valves 12. In this case, the amount of valve lift caused by pushing the valve open becomes large, L.
次に、シヤフト駆動装置２１により制御カム１
９が回転し、レバー１５が上方に回動した場合に
は、第５図に示すようにバルブ駆動カム１１がロ
ツカアーム１３をリフトさせても、レバー１５が
上方に後退しているため、支点接触点Ａ点が凹部
１３ａ側に移動するのが遅れ、従つてロツカアー
ム１３の凹部１３ａとレバー１５の凸部１５ａと
の嵌合が遅れ、バルブリフト量は１と小さくな
る。第６図において、曲線Ｐは制御Ｐカム１９に
よつてレバー１５の押し下げ量を大きくした場合
のバルブリフト特性を示し、曲線Ｑはレバー１５
の押し下げ量を小さくした場合のバルブリフト特
性を示す。 Next, the shaft drive device 21 drives the control cam 1.
9 rotates and the lever 15 pivots upward, even if the valve drive cam 11 lifts the rocker arm 13 as shown in FIG. There is a delay in the movement of point A toward the recess 13a, and accordingly, there is a delay in the engagement between the recess 13a of the rocker arm 13 and the protrusion 15a of the lever 15, and the valve lift amount becomes small to 1. In FIG. 6, a curve P shows the valve lift characteristic when the amount of depression of the lever 15 is increased by the control P cam 19, and a curve Q shows the valve lift characteristic when the lever 15 is pushed down by the control P cam 19.
This shows the valve lift characteristics when the amount of depression is reduced.
なお、前記レバー１５の凸部１５ｂの位置はレ
バー長手方向に変えることにより、バルブリフト
およびリフトタイミングの制御量を変えることが
できるので、前記位置をバルブステム１２ａの延
長線上に必ずしも設ける必要はない。 Note that by changing the position of the convex portion 15b of the lever 15 in the longitudinal direction of the lever, the amount of control of the valve lift and lift timing can be changed, so the position does not necessarily need to be provided on the extension line of the valve stem 12a. .
第７図は本考案の他の実施例を示す。これは第
３図に示すロツカアーム１３の凹部１３ａ，１３
ｂをそれぞれ凸部１３ｃ，１３ｄにするととも
に、レバー１５の凸部１５ａ，１５ｂをそれぞれ
凹部１５ｅ，１５ｆとして、これらの凸部１３
ｃ，１３ｄを凹部１５ｅ，１５ｆに嵌合したもの
である。また、１５ｇはレバー１５に設けたロツ
カアーム１３の横ずれを防止するガイド片であ
る。かかる実施例にあつても、第４図および第５
図について説明したのと同様の動作をする。 FIG. 7 shows another embodiment of the invention. This corresponds to the recesses 13a and 13 of the rocker arm 13 shown in FIG.
b are made into convex parts 13c and 13d, respectively, and convex parts 15a and 15b of the lever 15 are made into concave parts 15e and 15f, respectively, so that these convex parts 13
c and 13d are fitted into the recesses 15e and 15f. Further, 15g is a guide piece provided on the lever 15 to prevent the rocker arm 13 from shifting laterally. Even in such embodiments, FIGS. 4 and 5
The operation is similar to that described for the figure.
以上詳細に説明したように、本考案によれば、
機関回転に同期して回転するバルブ駆動カムと、
一端が前記バルブ駆動カムに他端がバルブステム
にそれぞれ連係し、かつ略中央部とバルブステム
側の一端で回動可能に支持されたレバーと、該レ
バーの傾斜量を規制する制御手段とから吸排気弁
駆動装置を形成したことにより、吸排気弁のバル
ブステムに強い曲げモーメントを作用するのを防
止することができ、バルブステムやこれのガイド
部材の摩耗や損傷あるいは破損を防止できる等の
効果が得られる。 As explained in detail above, according to the present invention,
A valve drive cam that rotates in synchronization with engine rotation,
a lever having one end connected to the valve drive cam and the other end connected to the valve stem, and rotatably supported at a substantially central portion and one end on the valve stem side; and a control means for regulating the amount of inclination of the lever. By forming the intake/exhaust valve drive device, it is possible to prevent strong bending moments from acting on the valve stems of the intake/exhaust valves, and it is possible to prevent wear, damage, or breakage of the valve stems and their guide members. Effects can be obtained.
第１図は従来の吸排気弁駆動装置の一部切断正
面図、第２図は本考案の吸排気弁駆動装置の平面
図、第３図は同じく一部切断正面図、第４図およ
び第５図は同じく作動前後の状態を示す要部の正
面図、第６図はバルブリフト特性図、第７図は同
じく他の実施例を示す要部の一部切断正面図であ
る。
１１……バルブ駆動カム、１２……吸排気弁、
１３……ロツカアーム、１５……レバー、１７…
…シヤフト、１９……制御カム、１３ａ，１３
ｂ，１３ｃ，１３ｄ……嵌合部、１５ａ，１５
ｂ，１５ｅ，１５ｆ……被嵌合部。
FIG. 1 is a partially cutaway front view of a conventional intake/exhaust valve drive device, FIG. 2 is a plan view of the intake/exhaust valve drive device of the present invention, FIG. 3 is a partially cutaway front view, and FIGS. FIG. 5 is a front view of the main part showing the state before and after operation, FIG. 6 is a valve lift characteristic diagram, and FIG. 7 is a partially cutaway front view of the main part showing another embodiment. 11... Valve drive cam, 12... Intake and exhaust valve,
13...Lotsuka arm, 15...lever, 17...
...Shaft, 19...Control cam, 13a, 13
b, 13c, 13d...fitting portion, 15a, 15
b, 15e, 15f... Fitted parts.
Claims (1)
と、一端が前記バルブ駆動カムに他端がバルブス
テムにそれぞれ連係し、かつ略中央部とバルブス
テム側の端部に嵌合部を有するロツカアームの背
面の凸曲面に支点接触する如く配設され、かつ前
記各嵌合部に嵌合する被嵌合部を有し、バルブス
テム側の一端で回動可能に支持されたレバーと、
機関の運転状態に応じて前記レバーの傾斜量を規
制する制御カムとを備えてなる内燃機関の吸排気
弁駆動装置。 A valve drive cam that rotates in synchronization with engine rotation, and a back side of a rocker arm that is linked to the valve drive cam at one end and the valve stem at the other end, and has a fitting part at a substantially central part and an end on the valve stem side. a lever disposed so as to be in fulcrum contact with the convex curved surface of the lever, having a fitted portion that fits into each of the fitting portions, and rotatably supported at one end on the valve stem side;
An intake and exhaust valve drive device for an internal combustion engine, comprising a control cam that regulates the amount of inclination of the lever according to the operating state of the engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5105082U JPS58154803U (en) | 1982-04-08 | 1982-04-08 | Internal combustion engine intake and exhaust valve drive device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5105082U JPS58154803U (en) | 1982-04-08 | 1982-04-08 | Internal combustion engine intake and exhaust valve drive device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58154803U JPS58154803U (en) | 1983-10-17 |
| JPS6318728Y2 true JPS6318728Y2 (en) | 1988-05-26 |
Family
ID=30061803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5105082U Granted JPS58154803U (en) | 1982-04-08 | 1982-04-08 | Internal combustion engine intake and exhaust valve drive device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58154803U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4586768B2 (en) * | 2006-05-29 | 2010-11-24 | トヨタ自動車株式会社 | Valve operating device for internal combustion engine |
-
1982
- 1982-04-08 JP JP5105082U patent/JPS58154803U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58154803U (en) | 1983-10-17 |
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