JPH01174542U - - Google Patents
Info
- Publication number
- JPH01174542U JPH01174542U JP7217588U JP7217588U JPH01174542U JP H01174542 U JPH01174542 U JP H01174542U JP 7217588 U JP7217588 U JP 7217588U JP 7217588 U JP7217588 U JP 7217588U JP H01174542 U JPH01174542 U JP H01174542U
- Authority
- JP
- Japan
- Prior art keywords
- piston
- chamber
- oil
- hydraulic chamber
- spool valve
- 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
Links
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 239000003921 oil Substances 0.000 claims 5
- 230000000903 blocking effect Effects 0.000 claims 1
- 238000007599 discharging Methods 0.000 claims 1
- 239000010705 motor oil Substances 0.000 claims 1
Landscapes
- Output Control And Ontrol Of Special Type Engine (AREA)
Description
第１図は、本考案による一実施例を示す可変圧
縮比ピストン部分の断面図、第２図は、高負荷時
における低圧縮比状態を示すピストン部分の断面
図である。
１…ピストン、２…アウターピストン、３…イ
ンナーピストン、４…ピストン油圧室、５ａ，５
ｂ…リング溝、５ｃ…オイルリング溝、５ｄ…オ
イル排出孔、５ｅ…オイル吐出孔、５ｆ…オイル
戻し孔、５ｇ…ドレン孔、６…コンロツド、６ａ
…オイル供給通路、７…ピストンピン、７ａ…オ
イル供給孔、１０…オイルポンプ、１１…スプー
ル弁、１２…圧力室、１３…圧力調整室、１４…
受圧部、１５…ロツド、１６…スライダー、１８
…リターンスプリング、１９，２０…オイル流通
孔、２１…チエツク弁、２２…オリフイス。
FIG. 1 is a sectional view of a variable compression ratio piston portion showing an embodiment of the present invention, and FIG. 2 is a sectional view of the piston portion showing a low compression ratio state under high load. 1...Piston, 2...Outer piston, 3...Inner piston, 4...Piston hydraulic chamber, 5a, 5
b...Ring groove, 5c...Oil ring groove, 5d...Oil discharge hole, 5e...Oil discharge hole, 5f...Oil return hole, 5g...Drain hole, 6...Conrod, 6a
...Oil supply passage, 7...Piston pin, 7a...Oil supply hole, 10...Oil pump, 11...Spool valve, 12...Pressure chamber, 13...Pressure adjustment chamber, 14...
Pressure receiving part, 15...rod, 16...slider, 18
...Return spring, 19, 20...Oil distribution hole, 21...Check valve, 22...Orifice.
Claims (1)
ピストンと、アウターピストン内を上下に摺動す
るインナーピストンに分割し、上記アウターピス
トンとインナーピストンとの間にピストン油圧室
を形成し、上記インナーピストンにコンロツドを
中空なピストンピンを介して取付け、上記ピスト
ンピンの両端部を密閉するとともに、内部を左右
にスライド可能なスプール弁を介して圧力室と圧
力調整室に分割し、上記ピストンピンの圧力室よ
りピストン油圧室に連通するオイル流通路に一方
向チエツク弁を設置し、上記ピストン油圧室より
ピストンピンの圧力調整室に連通するオイル流通
路にオリフイスを設置し、上記ピストンピンの圧
力室にオイルポンプを介してエンジンオイルを供
給するとともに、上記スプール弁によりピストン
油圧室に連通するオイル流通路を閉塞したとき、
上記圧力調整室内のオイルをピストン外部に排出
するドレン孔を設けてなる構成としたことを特徴
とする可変圧縮比ピストン。 The piston is divided into an outer piston that moves up and down in the cylinder and an inner piston that slides up and down in the outer piston, a piston hydraulic chamber is formed between the outer piston and the inner piston, and a connecting rod is installed in the inner piston. It is attached via a hollow piston pin, and both ends of the piston pin are sealed, and the interior is divided into a pressure chamber and a pressure adjustment chamber via a spool valve that can slide left and right. A one-way check valve is installed in the oil flow passage communicating with the hydraulic chamber, an orifice is installed in the oil flow passage communicating from the piston hydraulic chamber to the pressure adjustment chamber of the piston pin, and an oil pump is installed in the pressure chamber of the piston pin. When supplying engine oil through the spool valve and blocking the oil flow path communicating with the piston hydraulic chamber by the spool valve,
A variable compression ratio piston comprising a drain hole for discharging oil in the pressure adjustment chamber to the outside of the piston.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7217588U JPH01174542U (en) | 1988-05-30 | 1988-05-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7217588U JPH01174542U (en) | 1988-05-30 | 1988-05-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01174542U true JPH01174542U (en) | 1989-12-12 |
Family
ID=31297349
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7217588U Pending JPH01174542U (en) | 1988-05-30 | 1988-05-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01174542U (en) |
-
1988
- 1988-05-30 JP JP7217588U patent/JPH01174542U/ja active Pending
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