JPH0290358U - - Google Patents
Info
- Publication number
- JPH0290358U JPH0290358U JP16823988U JP16823988U JPH0290358U JP H0290358 U JPH0290358 U JP H0290358U JP 16823988 U JP16823988 U JP 16823988U JP 16823988 U JP16823988 U JP 16823988U JP H0290358 U JPH0290358 U JP H0290358U
- Authority
- JP
- Japan
- Prior art keywords
- piston
- piston chamber
- large diameter
- working fluid
- diameter portion
- 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
- 239000000446 fuel Substances 0.000 claims description 14
- 239000012530 fluid Substances 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 3
- 239000002828 fuel tank Substances 0.000 description 1
Landscapes
- Fuel-Injection Apparatus (AREA)
Description
第１図はこの考案の一実施例を示す概略構成図
、第２図はこの考案の燃料噴射装置と従来の燃料
噴射装置とにおけるピストン室の圧力上昇とピス
トンの移動速度とを示す図、第３図はこの考案の
燃料噴射装置と従来の燃料噴射装置との燃料噴射
率を示す図である。
１……装置本体、２……ピストン、３……電磁
切換弁（切換弁）、４……燃料ポンプ（作動流体
供給源）、５……燃料タンク（作動流体タンク）
、６……導入孔（導入路）、９……制御部、１３
……ピストン室、１５……燃料加圧室、２１……
大径部、２２……小径部。
FIG. 1 is a schematic configuration diagram showing an embodiment of this invention, FIG. 2 is a diagram showing the pressure rise in the piston chamber and the moving speed of the piston in the fuel injection device of this invention and a conventional fuel injection device. FIG. 3 is a diagram showing the fuel injection rates of the fuel injection device of this invention and the conventional fuel injection device. 1... Device body, 2... Piston, 3... Solenoid switching valve (switching valve), 4... Fuel pump (working fluid supply source), 5... Fuel tank (working fluid tank)
, 6...Introduction hole (introduction path), 9...Control unit, 13
... Piston chamber, 15 ... Fuel pressurization chamber, 21 ...
Large diameter part, 22...small diameter part.
Claims (1)
に小径部が形成されたピストンと、このピストン
の大径部に臨んで設けられたピストン室と、この
ピストン室に導入路を介して接続され、ピストン
室を、作動流体供給源と作動流体タンクとのいず
れか一方に接続し、他方に対して遮断する切換弁
と、上記ピストンの小径部に臨み、内部に燃料が
導入される燃料加圧室とを備え、上記作動流体供
給源から切換弁および導入路を介して上記ピスト
ン室に導入される作動流体によつて上記ピストン
を大径部側から小径部側へ向かつて移動させるこ
とにより、上記燃料加圧室内の燃料を加圧するよ
うにした増圧式燃料噴射装置において、上記導入
路を大径部の端面と対向するピストン室の壁面に
ピストン室の断面積よりも小さい面積をもつて開
口させるとともに、上記ピストン室の壁面に大径
部が突き当たつた際に大径部の端面が上記導入路
の開口部を遮蔽するように大径部の端面とピスト
ン室の壁面との少なくとも開口部を囲む部分を接
触させ、さらに上記ピストンの大径部がピストン
室の壁面に突き当たつている際に、上記ピストン
室と作動流体供給源とが接続するように上記切換
弁を切換動作させ、上記ピストンが燃料噴射量に
応じた距離だけ加圧移動した際に、上記ピストン
室と上記作動流体タンクとが接続するように切換
弁を切換動作させる制御部を設けたことを特徴と
する増圧式燃料噴射装置。 A piston having a large diameter portion formed at one end and a small diameter portion formed at the other end, a piston chamber provided facing the large diameter portion of the piston, and an introduction path into the piston chamber. a switching valve that connects the piston chamber to one of the working fluid supply source and the working fluid tank and shuts it off from the other; and a fuel that faces the small diameter portion of the piston and into which fuel is introduced. a pressurizing chamber, and the piston is moved from the large diameter side to the small diameter side by the working fluid introduced into the piston chamber from the working fluid supply source through the switching valve and the introduction path. In the pressure increase type fuel injection device which pressurizes the fuel in the fuel pressurizing chamber, the introduction passage is formed on the wall surface of the piston chamber facing the end surface of the large diameter portion, so that the area is smaller than the cross-sectional area of the piston chamber. The end face of the large diameter part and the wall surface of the piston chamber are arranged so that the end face of the large diameter part blocks the opening of the introduction passage when the large diameter part abuts against the wall surface of the piston chamber. The switching valve is switched so that the piston chamber and the working fluid supply source are connected when at least the portion surrounding the opening is in contact and the large diameter portion of the piston is in contact with the wall surface of the piston chamber. The control unit is further provided with a control unit that switches the switching valve so that the piston chamber and the working fluid tank are connected when the piston is pressurized and moved by a distance corresponding to the fuel injection amount. Pressure boost type fuel injection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16823988U JPH059496Y2 (en) | 1988-12-28 | 1988-12-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16823988U JPH059496Y2 (en) | 1988-12-28 | 1988-12-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0290358U true JPH0290358U (en) | 1990-07-18 |
| JPH059496Y2 JPH059496Y2 (en) | 1993-03-09 |
Family
ID=31457242
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16823988U Expired - Lifetime JPH059496Y2 (en) | 1988-12-28 | 1988-12-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH059496Y2 (en) |
-
1988
- 1988-12-28 JP JP16823988U patent/JPH059496Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH059496Y2 (en) | 1993-03-09 |