JPH0320487Y2 - - Google Patents
Info
- Publication number
- JPH0320487Y2 JPH0320487Y2 JP1983089981U JP8998183U JPH0320487Y2 JP H0320487 Y2 JPH0320487 Y2 JP H0320487Y2 JP 1983089981 U JP1983089981 U JP 1983089981U JP 8998183 U JP8998183 U JP 8998183U JP H0320487 Y2 JPH0320487 Y2 JP H0320487Y2
- Authority
- JP
- Japan
- Prior art keywords
- reservoir
- cylinder
- plunger
- pressure chamber
- chamber
- 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 2
- 230000007423 decrease Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
Description
【考案の詳細な説明】
本考案は内燃機関の油圧式弁間隙調整装置に関
する。[Detailed Description of the Invention] The present invention relates to a hydraulic valve gap adjustment device for an internal combustion engine.
従来のこの種の装置は、ロツカーアームに固設
されたシリンダ内に摺動自在に嵌合された一端閉
塞の中空円筒プランジヤと、シリンダ内に嵌合さ
れ、下端にオリフイスとチエツク弁を有し、前記
シリンダとともにリザーバ室を構成するリザーバ
とより成り、プランジヤとリザーバとシリンダ内
壁部分とにより高圧室を構成し、リザーバ室をそ
の上方においてシリンダに設けたドレン穴を介し
て外部と連通させて成るものである。 A conventional device of this type includes a hollow cylindrical plunger with one end closed, which is slidably fitted into a cylinder fixed to the rocker arm, and which is fitted into the cylinder and has an orifice and a check valve at the lower end. It consists of a reservoir that together with the cylinder constitutes a reservoir chamber, the plunger, the reservoir, and the inner wall of the cylinder constitute a high-pressure chamber, and the reservoir chamber is communicated with the outside through a drain hole provided in the cylinder above the plunger. It is.
このような従来の装置にあつてはシリンダの大
きさの割合にリザーバ室の容積が小さく、リザー
バ室の油供給口からチエツク弁までの距離が短い
ため、気泡を含んだ油がリザーバ室に供給される
と、リザーバ室内で気泡が上昇する間もなく、オ
リフイス、チエツク弁を通つて高圧室へ気泡がは
いり込み、高圧室の弾性率が高くなつて正常な弁
間隙機能を阻害するという問題があつた。 In such conventional devices, the volume of the reservoir chamber is small in proportion to the size of the cylinder, and the distance from the oil supply port of the reservoir chamber to the check valve is short, so oil containing air bubbles is supplied to the reservoir chamber. When this happens, the bubbles enter the high-pressure chamber through the orifice and check valve before they rise in the reservoir chamber, causing the high-pressure chamber's elastic modulus to become high and impeding normal valve gap function. .
またリザーバ室が小さいためにエンジン始動時
に高圧室が多量の油を必要とする時に油が不足
し、その分空気が高圧室にはいり込んでしまう場
合があつた。 Furthermore, since the reservoir chamber is small, when the high pressure chamber requires a large amount of oil at the time of starting the engine, there is a shortage of oil, which sometimes causes air to enter the high pressure chamber.
本考案はこのような従来の問題点に着目してな
されたものでリザーバをプランジヤの中空部内へ
延長させてリザーバ室を大きくし、この延長部の
下部にチエツク弁を設け、これによつて、油圧式
弁間隙調整装置の全長を最小にしながら油供給口
からチエツク弁までの距離を長くし、リザーバ室
内で油と気泡との分離を容易にし、チエツク弁よ
り高圧室へ流れ込む気泡の量を減少さすることが
できる特徴を有する。また、リザーバ室の容量を
大きくできるためにエンジン始動時の高圧室の空
気吸入を減少できる。リザーバ室上方にたまつた
空気はシリンダ上方にあけられたドレン穴より油
とともに外部へ排出され、気泡を含む油が連続的
に供給されてもリザーバ室へ空気が蓄積されるこ
とはない。更に、高圧室へ突出させたリザーバは
高圧室の体積を減少させるので油の弾性に伴うプ
ランジヤの変位を減少させる。 The present invention was developed by focusing on these conventional problems, and the reservoir chamber is enlarged by extending the reservoir into the hollow part of the plunger, and a check valve is provided at the bottom of this extension, thereby achieving the following: While minimizing the total length of the hydraulic valve gap adjustment device, the distance from the oil supply port to the check valve is increased, making it easier to separate oil and air bubbles in the reservoir chamber, and reducing the amount of air bubbles flowing into the high pressure chamber from the check valve. It has the characteristic that it can be used. Furthermore, since the capacity of the reservoir chamber can be increased, air intake into the high pressure chamber at the time of engine startup can be reduced. The air accumulated above the reservoir chamber is discharged to the outside together with the oil from a drain hole drilled above the cylinder, and even if oil containing air bubbles is continuously supplied, air will not accumulate in the reservoir chamber. Furthermore, the reservoir projecting into the high pressure chamber reduces the volume of the high pressure chamber, thereby reducing the displacement of the plunger due to the elasticity of the oil.
以下、本考案を図面に基づいて説明する。 Hereinafter, the present invention will be explained based on the drawings.
まず第1図の構成を説明すると、シリンダ3は
ロツカーアーム1に固設され、シリンダヘツド油
圧回路はロツカーアーム内の油路2を介してシリ
ンダ回りの油供給環状溝4に連通している。シリ
ンダには上方開放リザーバ5が嵌合され、リザー
バ5はその下部が下方に延長された小径延長部
5′を有し、その下端にオリフイスと協働するチ
エツクボール6、リリーフスプリング7、リテー
ナ8により構成されるチエツク弁が、設けられて
いる。リザーバの開放端はシリンダの頂閉塞壁と
接してリザーバ室9をその内部に形成している。
シリンダの油供給路10、リザーバ5にその開放
端に隣接して設けられたリザーバ油供給口11に
より、リザーバ室9は油供給環状溝4と連通す
る。リザーバとシリンダとの嵌合すき間は例えば
合成樹脂などのリング状シール12をリザーバの
外周壁に設けることによつてシールされている。 First, the configuration shown in FIG. 1 will be described. The cylinder 3 is fixedly attached to the rocker arm 1, and the cylinder head hydraulic circuit communicates with an oil supply annular groove 4 around the cylinder via an oil passage 2 in the rocker arm. An upwardly open reservoir 5 is fitted into the cylinder, and the lower part of the reservoir 5 has a small diameter extension 5' extending downward, and at its lower end there is a check ball 6, a relief spring 7, and a retainer 8 that cooperate with an orifice. A check valve is provided. The open end of the reservoir contacts the top closing wall of the cylinder to form a reservoir chamber 9 therein.
The reservoir chamber 9 communicates with the oil supply annular groove 4 through an oil supply passage 10 of the cylinder and a reservoir oil supply port 11 provided in the reservoir 5 adjacent to its open end. The fitting gap between the reservoir and the cylinder is sealed by providing a ring-shaped seal 12 made of, for example, synthetic resin on the outer peripheral wall of the reservoir.
シリンダにはリザーバと向かい合わせにプラン
ジヤ13が摺動自在に嵌入され、リザーバのチエ
ツク弁をもつ延長部はプランジヤ中空部内へ突出
している。リザーバとプランジヤとシリンダとに
よつて高圧室16が形成され、リザーバとプラン
ジヤとの間には復帰バネ14が適当なセツト荷重
のものとに置かれている。シリンダ開放端にはプ
ランジヤ13がシリンダから抜出ない様にストツ
パ15が取付けられている。 A plunger 13 is slidably fitted into the cylinder opposite the reservoir, and the extension of the reservoir with the check valve projects into the hollow part of the plunger. A high pressure chamber 16 is formed by the reservoir, plunger and cylinder, and a return spring 14 is placed between the reservoir and the plunger with a suitable set load. A stopper 15 is attached to the open end of the cylinder to prevent the plunger 13 from coming out of the cylinder.
シリンダの頂閉塞壁中央にはドレン穴18が外
部と連通するようにあけられ微少すき間をもつて
漏れ止め弁19がこのドレン穴18に取付けられ
ている。 A drain hole 18 is opened in the center of the top closed wall of the cylinder so as to communicate with the outside, and a leak prevention valve 19 is attached to this drain hole 18 with a slight gap.
第2図はドレン穴18をシリンダの頂閉塞端に
隣接してその周壁にあけシリンダボデイとロツカ
ーアームとの間のすき間20より外部へ油を少量
吐出させる実施例を示している。又第3図はドレ
ン穴18のすぐ下にリザーバの内壁で支持された
流量制御板21を置くことによつて油を外部へ小
量吐出させる実施例である。 FIG. 2 shows an embodiment in which a drain hole 18 is formed in the circumferential wall of the cylinder adjacent to the top closed end and a small amount of oil is discharged to the outside through a gap 20 between the cylinder body and the rocker arm. FIG. 3 shows an embodiment in which a small amount of oil is discharged to the outside by placing a flow rate control plate 21 supported by the inner wall of the reservoir just below the drain hole 18.
リザーバ室9および高圧室16が油で満たされ
ているとするとカム17の回転に従いエンジンバ
ルブが開くと、バルブスプリングの荷重によりプ
ランジヤ13に荷重が加わり、チエツクボール弁
6が完全に閉じているため高圧室16に高圧が発
生する。高圧室内の油の弾性分、高圧室の体積は
減少し、その分プランジヤは僅かに変位する。高
圧室の油はシリンダ3とプランジヤ13との摺動
面すき間よりわずかに漏れ、プランジヤ13はそ
の分更に変位する。 Assuming that the reservoir chamber 9 and the high pressure chamber 16 are filled with oil, when the engine valve opens according to the rotation of the cam 17, a load is applied to the plunger 13 due to the load of the valve spring, and the check ball valve 6 is completely closed. High pressure is generated in the high pressure chamber 16. The volume of the high pressure chamber decreases due to the elasticity of the oil in the high pressure chamber, and the plunger is slightly displaced by that amount. The oil in the high pressure chamber leaks slightly from the gap between the sliding surfaces of the cylinder 3 and the plunger 13, and the plunger 13 is further displaced by that amount.
エンジンバルブが閉じられると復帰バネ14に
よりプランジヤ13は押し戻され、高圧室16の
圧力がリザーバ室9の圧力より下がり、チエツク
ボール弁6が開きリザーバ室9よりオリフイスを
通して高圧室16へ油が流れ込む。 When the engine valve is closed, the plunger 13 is pushed back by the return spring 14, the pressure in the high pressure chamber 16 drops below the pressure in the reservoir chamber 9, and the check ball valve 6 opens, allowing oil to flow from the reservoir chamber 9 into the high pressure chamber 16 through the orifice.
本考案ではシリンダヘツド油圧回路より供給さ
れる油中に気泡が含まれていても、リザーバの油
供給口11とチエツク弁との間の距離が長いため
に、リザーバ室9に入つた油の中の気泡30は上
方へ集まつてドレン穴18と弁19とのすき間よ
り外部へ抜け出し、チエツク弁より高圧室へ入る
油の中の気泡を減少させることができる。また、
エンジン始動時高圧室が多量の油を必要とする時
でもリザーバ室の容量が大きく確保されているた
め油不足を生じることが少なくなつた。この様に
本考案では高圧室が空気を吸込んで間隙調整機能
を著しく阻害するのを防ぐことができる。 In the present invention, even if air bubbles are included in the oil supplied from the cylinder head hydraulic circuit, the distance between the oil supply port 11 of the reservoir and the check valve is long, so the oil that has entered the reservoir chamber 9 is The air bubbles 30 gather upward and escape to the outside through the gap between the drain hole 18 and the valve 19, thereby reducing the number of air bubbles in the oil entering the high pressure chamber through the check valve. Also,
Even when the high pressure chamber requires a large amount of oil when starting the engine, the large capacity of the reservoir chamber ensures that oil shortages are less likely to occur. In this way, the present invention can prevent the high-pressure chamber from sucking in air and significantly interfering with the gap adjustment function.
第1図は本考案による内燃機関の弁間隙調整装
置の一例を示す断面図、第2図は他の例を示す第
1図と同様な図、第3図は更に他の例を示す断面
図である。
1……ロツカーアーム、3……シリンダ、5…
…リザーバ、9……リザーバ室、5′……小径延
長部、13……プランジヤ、16……高圧室。
Fig. 1 is a cross-sectional view showing an example of the valve gap adjustment device for an internal combustion engine according to the present invention, Fig. 2 is a view similar to Fig. 1 showing another example, and Fig. 3 is a cross-sectional view showing yet another example. It is. 1...Rotzker arm, 3...cylinder, 5...
...Reservoir, 9...Reservoir chamber, 5'...Small diameter extension, 13...Plunger, 16...High pressure chamber.
Claims (1)
された一端閉塞の中空円筒プランジヤと、シリン
ダ内に嵌合され下端にオリフイスとチエツク弁を
有し、前記シリンダとともにリザーバ室を構成す
るリザーバとより成り、プランジヤとリザーバと
シリンダ周壁とにより高圧室を構成し、前記リザ
ーバ室の上方をシリンダに設けたドレン穴と連通
させて成る油圧式弁間隙調整装置において、リザ
ーバを小径延長部として前記プランジヤの中空部
内へ突出させ、チエツク弁を前記高圧室内におい
て前記延長部の下端に設けたことを特徴とする弁
間隙調整装置。 It consists of a hollow cylindrical plunger with one end closed and slidably fitted into the cylinder of the rocker arm, and a reservoir fitted into the cylinder and having an orifice and a check valve at the lower end and forming a reservoir chamber together with the cylinder, In a hydraulic valve gap adjustment device in which a plunger, a reservoir, and a cylinder circumferential wall constitute a high-pressure chamber, and the upper part of the reservoir chamber is communicated with a drain hole provided in the cylinder, the reservoir is used as a small-diameter extension inside the hollow part of the plunger. A valve gap adjusting device, characterized in that the check valve is provided at a lower end of the extension portion within the high pressure chamber.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8998183U JPS59194508U (en) | 1983-06-13 | 1983-06-13 | Hydraulic valve gap adjustment device for internal combustion engines |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8998183U JPS59194508U (en) | 1983-06-13 | 1983-06-13 | Hydraulic valve gap adjustment device for internal combustion engines |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS59194508U JPS59194508U (en) | 1984-12-24 |
JPH0320487Y2 true JPH0320487Y2 (en) | 1991-05-02 |
Family
ID=30219880
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8998183U Granted JPS59194508U (en) | 1983-06-13 | 1983-06-13 | Hydraulic valve gap adjustment device for internal combustion engines |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS59194508U (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0636244Y2 (en) * | 1987-04-09 | 1994-09-21 | 富士バルブ株式会社 | Hydraulic valve lash adjuster internal type rocker arm |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5632018A (en) * | 1979-08-24 | 1981-04-01 | Nippon Soken Inc | Hydraulic valve lifting device |
JPS5818005B2 (en) * | 1975-01-08 | 1983-04-11 | トムソン − セ−エスエフ | Dansei Hiyoumenhano Kutsusetsumushiyuusasouchi |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5818005U (en) * | 1981-07-30 | 1983-02-03 | 三菱自動車工業株式会社 | Zero latch adjuster |
-
1983
- 1983-06-13 JP JP8998183U patent/JPS59194508U/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5818005B2 (en) * | 1975-01-08 | 1983-04-11 | トムソン − セ−エスエフ | Dansei Hiyoumenhano Kutsusetsumushiyuusasouchi |
JPS5632018A (en) * | 1979-08-24 | 1981-04-01 | Nippon Soken Inc | Hydraulic valve lifting device |
Also Published As
Publication number | Publication date |
---|---|
JPS59194508U (en) | 1984-12-24 |
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