JPS6425437U - - Google Patents
Info
- Publication number
- JPS6425437U JPS6425437U JP11931887U JP11931887U JPS6425437U JP S6425437 U JPS6425437 U JP S6425437U JP 11931887 U JP11931887 U JP 11931887U JP 11931887 U JP11931887 U JP 11931887U JP S6425437 U JPS6425437 U JP S6425437U
- Authority
- JP
- Japan
- Prior art keywords
- piston
- fluid chamber
- hydraulic
- inner piston
- hydraulic fluid
- 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.)
- Granted
Links
- 239000012530 fluid Substances 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 claims 1
- 239000007788 liquid Substances 0.000 description 1
Landscapes
- Output Control And Ontrol Of Special Type Engine (AREA)
Description
第１図はこの考案の一実施例における高圧縮比
状態を示す要部断面図、第２図はこの実施例の低
圧縮比状態を示す要部断面図、第３図は従来の圧
縮比可変装置を示す全体構成図、第４図は第３図
の一部拡大図、第５図は作動液室内の油圧変動状
態を示すグラフである。
２１…アウタピストン、２１ｂ…冠部下面、２
３…ピストンピン、２５…作動液室、２６…スプ
ール弁（切替弁）、２９…インナピストン、２９
ｂ…上面、３１…上部液室、３３…油圧回路、４
５…摺動体、４６…弁体、４６ａ，４８ａ…対向
面。
Fig. 1 is a sectional view of the main part showing a high compression ratio state in an embodiment of this invention, Fig. 2 is a sectional view of the main part showing a low compression ratio state of this embodiment, and Fig. 3 is a conventional variable compression ratio. FIG. 4 is a partially enlarged view of FIG. 3, and FIG. 5 is a graph showing the state of oil pressure fluctuation in the hydraulic fluid chamber. 21... Outer piston, 21b... Lower surface of crown, 2
3... Piston pin, 25... Working fluid chamber, 26... Spool valve (switching valve), 29... Inner piston, 29
b...Top surface, 31...Upper liquid chamber, 33...Hydraulic circuit, 4
5...Sliding body, 46...Valve body, 46a, 48a...Opposing surface.
Claims (1)
トンと、該インナピストンの外周に軸方向へ摺動
可能に被嵌したアウタピストンと、該アウタピス
トンの冠部下面と上記インナピストンの上面との
間に形成された上部液室と、上記ピストンピンあ
るいはインナピストンの所定内部に形成された作
動液室と、上記上部液室に作動液室を介して圧油
を給排する油圧回路と、上記作動液室内に摺動可
能に収納され、かつ機関運転状態に応じて上記油
圧回路を切替える切替弁とを備え、更に上記切替
弁は、上記作動液室内の油圧を夫々の対向面で受
ける弁体と摺動体とを有すると共に、上記各対向
面の受圧面積が同一に形成されたことを特徴とす
る内燃機関の圧縮比可変装置。 An inner piston supported by both ends of the piston pin, an outer piston fitted slidably in the axial direction on the outer circumference of the inner piston, and between the lower surface of the crown of the outer piston and the upper surface of the inner piston. a hydraulic fluid chamber formed in a predetermined interior of the piston pin or inner piston; a hydraulic circuit that supplies and discharges pressure oil to and from the upper fluid chamber via the hydraulic fluid chamber; A switching valve is slidably housed in the chamber and switches the hydraulic circuit according to the engine operating state, and the switching valve has a valve body and a sliding valve that receive the hydraulic pressure in the hydraulic fluid chamber on their respective opposing surfaces. What is claimed is: 1. A variable compression ratio device for an internal combustion engine, characterized in that the pressure receiving area of each of the opposing surfaces is the same.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11931887U JPH0612229Y2 (en) | 1987-08-04 | 1987-08-04 | Variable compression ratio device for internal combustion engine |
| US07/208,312 US4934347A (en) | 1987-06-18 | 1988-06-15 | Variable compression piston arrangement for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11931887U JPH0612229Y2 (en) | 1987-08-04 | 1987-08-04 | Variable compression ratio device for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6425437U true JPS6425437U (en) | 1989-02-13 |
| JPH0612229Y2 JPH0612229Y2 (en) | 1994-03-30 |
Family
ID=31364442
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11931887U Expired - Lifetime JPH0612229Y2 (en) | 1987-06-18 | 1987-08-04 | Variable compression ratio device for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0612229Y2 (en) |
-
1987
- 1987-08-04 JP JP11931887U patent/JPH0612229Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0612229Y2 (en) | 1994-03-30 |