JPS6137773Y2 - - Google Patents
Info
- Publication number
- JPS6137773Y2 JPS6137773Y2 JP1980025232U JP2523280U JPS6137773Y2 JP S6137773 Y2 JPS6137773 Y2 JP S6137773Y2 JP 1980025232 U JP1980025232 U JP 1980025232U JP 2523280 U JP2523280 U JP 2523280U JP S6137773 Y2 JPS6137773 Y2 JP S6137773Y2
- Authority
- JP
- Japan
- Prior art keywords
- roller
- tappet
- axis
- cam
- camshaft
- 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 description 8
- 230000000694 effects Effects 0.000 description 5
- 230000002265 prevention Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000002195 synergetic 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
- F01L2307/00—Preventing the rotation of tappets
Landscapes
- Transmission Devices (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Gears, Cams (AREA)
Description
【考案の詳細な説明】
本考案は内燃機関のローラタペツトの改良に関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a roller tappet for an internal combustion engine.
第１図は一般的な内燃機関に於ける動弁系の構
造を示したものであるが、内燃機関のシリンダボ
デー１のシリンダ２内にはピストン３が摺動自在
に嵌挿されていて、その上部に燃焼室４を形成す
るようになつており、また上記シリンダボデー１
上にはシリンダヘツド５が配設されていて、上記
燃焼室４と吸（排）気弁７を介して連通し得る吸
（排）気路６が形成されている。 FIG. 1 shows the structure of a valve train in a general internal combustion engine. A piston 3 is slidably inserted into a cylinder 2 of a cylinder body 1 of the internal combustion engine. A combustion chamber 4 is formed in the upper part of the cylinder body 1.
A cylinder head 5 is disposed above, and an intake (exhaust) air passage 6 that can communicate with the combustion chamber 4 via an intake (exhaust) valve 7 is formed.
そして上記吸（排）気弁７は、ロツカー軸８に
支承されているロツカーアーム９の揺動に応じて
動作するブリツジアーム１０によつて開閉作動を
行い、上記ロツカーアーム９の揺動作用はプツシ
ユロツド１１及びタペツト１２を介して、図示し
ないクランク軸により駆動されるカム軸１３上に
形成されたカム１４によつて与えられるようにな
つている。 The intake (exhaust) valve 7 is opened and closed by a bridge arm 10 that operates in accordance with the rocking motion of a rocker arm 9 supported on a rocker shaft 8. Via the tappet 12, it is provided by a cam 14 formed on a camshaft 13 driven by a crankshaft (not shown).
ところで、上記カム１４とタペツト１２との接
触を、すべり接触に代えてころがり接触とするこ
とにより耐摩耗性、耐久性の向上を図るべく、図
示の如くローラ１５をタペツト１２の下端に回動
自在に設けたものがある。この場合、タペツト１
２が矢印Ａの様に旋回してしまうと、上記ローラ
１５がカム１４上でころがることができなくなる
ため、タペツト１２に回り止めを施こす必要が生
ずる。 By the way, in order to improve wear resistance and durability by making the contact between the cam 14 and the tappet 12 a rolling contact instead of a sliding contact, a roller 15 can be freely rotated at the lower end of the tappet 12 as shown in the figure. There is one set up in In this case, Tappet 1
2 turns in the direction of arrow A, the roller 15 will no longer be able to roll on the cam 14, making it necessary to prevent the tappet 12 from rotating.
そこで、従来のタペツト１２においては、ボデ
ー１に取付けた止栓１６の先端の当接部１６１を
タペツト１２の溝１２２に挿入し、それらの係止
作用によつて前記矢印Ａの如きタペツト１２の旋
回を防止していた。ところが、上記当接部１６１
と溝１２２との当接作用の繰り返えしによつてそ
れらの係止部の摩耗が極めて著しくなるという不
具合があり、更にエンジンの組立時におけるタペ
ツト１２と止栓１６をマツチングさせるための作
業も煩しいという欠点があつた。 Therefore, in the conventional tappet 12, the contact portion 161 at the tip of the stopper 16 attached to the body 1 is inserted into the groove 122 of the tappet 12, and by their locking action, the tappet 12 as shown by the arrow A is inserted. It prevented turning. However, the contact portion 161
There is a problem in that due to repeated contact between the tappet 12 and the groove 122, the wear of these locking parts becomes extremely significant, and furthermore, it is difficult to match the tappet 12 and the stopcock 16 when assembling the engine. It also had the disadvantage of being annoying.
また、実公昭30−12702号公報には、弁動カム
の回転軸と平行に機関体に取付けられた枢着
（軸）を中心に一体化した吸、排気弁用揺動扛杆
を揺動せしめて吸、排気弁用プツシユロツドを往
復動させるように構成された調速装置兼用弁動装
置が記載されているが、この装置では前述のよう
なローラの旋回は生じないが、各気筒に夫々独立
した弁動装置が必要になり機関の構造が複雑にな
るおそれがある。 In addition, in Japanese Utility Model Publication No. 30-12702, a swinging rod for intake and exhaust valves, which is integrated around a pivot (shaft) attached to the engine body parallel to the rotation axis of the valve drive cam, is disclosed. A speed governor/valve operating device is described that is configured to at least reciprocate the push rods for intake and exhaust valves, but this device does not cause the rotation of the rollers as described above; An independent valve operating device is required, which may complicate the structure of the engine.
更に実開昭52−145208号公報には、ローラが最
大荷重時にカム面にほゞ垂直に接するように、ロ
ーラ・タペツトの往復動軸心を、カム軸中心を通
る放射線よりもカム軸の回転方向と逆方向に偏位
して配置した内燃機関におけるカム装置が開示さ
れているが、上述のようにローラのO2がカム軸
の回転方向とは逆方向に偏位していてはローラに
一定方向付けが得られないばかりでなく、むし
ろ、ローラ及びタペツトに旋回力を与えてしまう
おそれがある。 Furthermore, Japanese Utility Model Application Publication No. 52-145208 discloses that the axis of the reciprocating motion of the roller tappet is set so that the rotation of the camshaft is set from the line passing through the center of the camshaft so that the roller is in contact with the cam surface almost perpendicularly at the time of maximum load. A cam device for an internal combustion engine is disclosed in which the O 2 of the roller is offset in the opposite direction to the rotational direction of the camshaft. Not only will a constant orientation not be achieved, but there is a risk that the rollers and tappets will be subject to swirling forces.
本考案は上述の如き従来例の欠点を除去すると
ともに、ローラ軸心をカム軸の回転方向にオフセ
ツトすることにより、タペツトの回り止め効果を
得るようにしたローラタペツトを提供せんとする
もので、その要旨はカムと接するローラを備える
タペツトの軸心とカム軸の軸心とを結ぶ軸線に対
して、前記ローラの軸心をカム軸の回転方向にオ
フセツトさせたことにあり、以下その一実施例を
図について説明する。尚、前記従来例と同じ部品
については同一符号を付すものとする。 The present invention aims to eliminate the above-mentioned drawbacks of the conventional example and also to provide a roller tappet in which the roller axis is offset in the direction of rotation of the camshaft to obtain a rotation-preventing effect of the tappet. The gist is that the axis of the roller is offset in the direction of rotation of the camshaft with respect to the axis connecting the axis of the tappet with the roller in contact with the cam and the axis of the camshaft, and one embodiment thereof will be described below. Explain the diagram. Note that the same parts as in the conventional example are given the same reference numerals.
本考案ローラタペツトはタペツト１２の軸心
O12とカム軸１３の軸心O13とを結ぶ軸線L1に対
して、ローラ１５の軸心O15がカム軸の回転方向
に予め適宜に設定された距離ｌだけオフセツトし
た軸線L2上にくるように、ローラ１５の軸１５
１の両側部をタペツト１２の下端部にやゝ弧状を
成したアーム１７によつて回動自在に取付けるよ
うにしたものである。 The roller tappet of the present invention has an axis of the tappet 12.
On the axis L2 , the axis O15 of the roller 15 is offset by a predetermined distance l in the direction of rotation of the camshaft with respect to the axis L1 connecting O12 and the axis O13 of the camshaft 13 . the shaft 15 of the roller 15 so that
Both sides of the tappet 1 are rotatably attached to the lower end of the tappet 12 by arms 17 having a slightly arched shape.
従つて、内燃機関が作動しカム１４が矢印Ｒ方
向に回転すると、ローラ１５は図で時計方向に回
転するが、その際ローラ１５の軸心O15が前述の
ように軸線L1に対してオフセツトされているた
めに、ローラ１５はカム１４との接触抵抗によつ
て常にその向きを一定に保つ効果を生じせしめ、
ローラ１５の向きが回転中常に正規状態に保持さ
れるので、タペツト１２がＡ方向に回転するのが
抑止される。更に、上記オフセツトによりローラ
１５がカム１４の側部に線接触で当接するため、
ローラ１５及びタペツト１２の回動が阻止され
る。 Therefore, when the internal combustion engine operates and the cam 14 rotates in the direction of arrow R, the roller 15 rotates clockwise in the figure, but at this time, the axis O 15 of the roller 15 is aligned with the axis L 1 as described above. Since the roller 15 is offset, the contact resistance with the cam 14 creates the effect of always keeping its direction constant.
Since the orientation of the roller 15 is always maintained in the normal state during rotation, the tapepet 12 is prevented from rotating in the A direction. Furthermore, because the roller 15 comes into line contact with the side of the cam 14 due to the offset,
Rotation of the roller 15 and tappet 12 is prevented.
以上のように、本考案によるローラタペツトは
カムと接するローラを備えるタペツトの軸心とカ
ム軸の軸心とを結ぶ軸線に対して、前記ローラの
軸心をカム軸の回転方向にオフセツトさせてなる
ので、前記ローラと前記カムとの間に前記ローラ
の向きを常に一定にする効果が得られるタペツト
の回動は防止される。 As described above, the roller tappet according to the present invention has the axis of the roller offset in the direction of rotation of the camshaft with respect to the axis connecting the axis of the tappet with the roller in contact with the cam and the axis of the camshaft. Therefore, rotation of the tappet is prevented between the roller and the cam, which provides the effect of always keeping the direction of the roller constant.
また、前記オフセツトにより、前記ローラが前
記カムの側部に線接触により当接するため、前記
ローラ及びタペツトの回動が阻止される。 Furthermore, the offset allows the roller to abut the side of the cam in line contact, thereby preventing rotation of the roller and tappet.
更に、上述のように前記ローラが前記カムの側
部に当接するので、前記ローラは前記カムから側
圧をうけ、前記ローラと前記カムとの間に前記ロ
ーラの向きを常に一定にする効果との相乗効果に
よつて前記ローラ及びタペツトの回動がより確実
に防止される。 Furthermore, since the roller comes into contact with the side of the cam as described above, the roller receives side pressure from the cam, and there is an effect that the direction of the roller is always kept constant between the roller and the cam. Due to the synergistic effect, rotation of the roller and tappet is more reliably prevented.
また、従来のタペツト回り止め装置と異なり、
タペツトに溝を設けたり、回り止め用止栓を設け
る必要がなく、前記溝と止栓との係止部の摩耗が
発生するという不具合も防止でき、より信頼性の
あるローラタペツトを提供できる効果がある。 Also, unlike conventional tapepet rotation prevention devices,
There is no need to provide a groove in the tappet or a stopper for preventing rotation, and the problem of wear of the engagement part between the groove and the stopper can be prevented, which has the effect of providing a more reliable roller tappet. be.
第１図は従来内燃機関の動弁系構造を示す一部
破断面による縦断面図、第２図は本考案によるロ
ーラタペツト回り止め構造を示す拡大断面図であ
る。
１２……タペツト、１３……カム軸、１４……
カム、１５……ローラ、１７……支持アーム、Ｌ
１……タペツトの軸心とカム軸の軸心とを結ぶ軸
線、Ｌ２……ローラの軸心を通る軸線。
FIG. 1 is a partially broken vertical sectional view showing a conventional valve train structure of an internal combustion engine, and FIG. 2 is an enlarged sectional view showing a roller tappet rotation prevention structure according to the present invention. 12... Tappet, 13... Camshaft, 14...
Cam, 15...roller, 17...support arm, L
1... Axis line connecting the axis of the tappet and the axis of the camshaft, L2... Axis line passing through the axis of the roller.
Claims (1)
カム軸の軸心とを結ぶ軸線に対して、前記ローラ
の軸心をカム軸の回転方向にオフセツトさせてな
るローラタペツト。 A roller tappet in which the axis of the roller is offset in the rotational direction of the camshaft with respect to an axis connecting the axis of the tappet with the roller in contact with the cam and the axis of the camshaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1980025232U JPS6137773Y2 (en) | 1980-02-28 | 1980-02-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1980025232U JPS6137773Y2 (en) | 1980-02-28 | 1980-02-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56127802U JPS56127802U (en) | 1981-09-29 |
| JPS6137773Y2 true JPS6137773Y2 (en) | 1986-11-01 |
Family
ID=29621288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1980025232U Expired JPS6137773Y2 (en) | 1980-02-28 | 1980-02-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6137773Y2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52145208U (en) * | 1976-04-30 | 1977-11-04 |
-
1980
- 1980-02-28 JP JP1980025232U patent/JPS6137773Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56127802U (en) | 1981-09-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5427065A (en) | Valve operating mechanism for 4-cycle engine | |
| EP1182331A3 (en) | Engine with two cylinder banks each with a valve operating device enabling variation of valve timing and valve lift characteristic | |
| JPS6137773Y2 (en) | ||
| JPS6137774Y2 (en) | ||
| JPH0629525B2 (en) | Valve mechanism of internal combustion engine | |
| JPS60243310A (en) | Variable opening amount of valve device for intake and exhaust valves of four-stroke cycle engine | |
| JPS60216012A (en) | Valve drive mechanism in internal-combustion engine | |
| JPS63230916A (en) | Rotsuka arm using roller bearings | |
| JPS6059407B2 (en) | Internal combustion engine valve train | |
| JPS603922Y2 (en) | Tappet | |
| JP3383988B2 (en) | Variable lift valve | |
| JPS6285108A (en) | Ohc type tappet valve device for internal combustion engine | |
| JPS6182009U (en) | ||
| JPS6114564Y2 (en) | ||
| JPH064003Y2 (en) | Four-cycle engine valve drive | |
| JPH0629524B2 (en) | Valve timing switching device for internal combustion engine | |
| JPH0435523Y2 (en) | ||
| JPS6156406B2 (en) | ||
| JPH0447371Y2 (en) | ||
| JPH0355764Y2 (en) | ||
| JPH05272313A (en) | Rocker arm structure | |
| JPS6245910A (en) | Tappet device for overhead cam type four cycle engine | |
| JPH0218247Y2 (en) | ||
| JP4216992B2 (en) | Engine valve gear | |
| JPS6210406A (en) | Ohc-type tappet device of internal combustion engine |