JPS58113574A - Fuel injector in engine - Google Patents

Fuel injector in engine

Info

Publication number
JPS58113574A
JPS58113574A JP20992381A JP20992381A JPS58113574A JP S58113574 A JPS58113574 A JP S58113574A JP 20992381 A JP20992381 A JP 20992381A JP 20992381 A JP20992381 A JP 20992381A JP S58113574 A JPS58113574 A JP S58113574A
Authority
JP
Japan
Prior art keywords
pressure
nozzle
pump
fuel
duct
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
Application number
JP20992381A
Other languages
Japanese (ja)
Inventor
Jiro Akagi
赤城　二郎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Komatsu Ltd
Original Assignee
Komatsu Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Komatsu Ltd filed Critical Komatsu Ltd
Priority to JP20992381A priority Critical patent/JPS58113574A/en
Priority to GB08236408A priority patent/GB2115066B/en
Publication of JPS58113574A publication Critical patent/JPS58113574A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/462—Delivery valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/28—Details of throttles in fuel-injection apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0054—Check valves

Abstract

PURPOSE:To stabilize the pressure in a duct, and stabilize injection of fuel in such a way that a throttle valve which has throttling function only from the nozzle side to the pump side is provided on the way to a duct to connect the fuel injection pump and the injection nozzle to each other. CONSTITUTION:Fuel which is injected from a fuel injection pump 1 is fed through a duct 2 to an injection nozzle 3 of each cylinder. A throttle valve 4 is installed on the side of a pump 1 on this duct 2. A throttle 4c which is energized to the side of the pump 1 by a spring 4b is installed in the valve body 4a of the throttle valve 4, and only the pressure which is returned from the side of the nozzle 3 to the side of the pump 1 is throttled. On the other hand, the fuel which has been fed through the duct 2 to the nozzle 3 is led through the head part of a needle 7 and a check valve 5 to a pressure accumulating chamber 3a. Thus, since a proper pressure is held in the duct 2, and then the pressure in the duct is stabilized in the next injection time, cycle fluctuation in the pressure can be reduced.

Description

【発明の詳細な説明】 この発明は燃料噴射ポンプと噴射ノズルを接続する管路
の途中にノズル側よシボンブ側へ戻る方向のみ絞９機能
を有する絞り弁を設けたエンジンの燃料噴射装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel injection device for an engine in which a throttle valve having a throttle function only in the direction from the nozzle side to the cylinder side is provided in the middle of a pipe connecting a fuel injection pump and an injection nozzle.

従来デイゼルエンジンなどに採用されている燃料噴射装
置は、燃料噴射ポンプ星より吐出され九燃料を管路ｂ［
よシ噴射ノズルＣへ供給しノズルＣ内の蓄圧室ｄの圧力
がニードル・を付勢するばねｔＫ打勝ってニードルｅが
上昇したところで、ノズルＣ先端の噴孔ｇよりシリンダ
内へ燃料を噴射する方式を採用している。しかしこの方
式ではポンプ１とノズルＣの間が高圧配管により接続さ
れているため、管路す中で変動し、蓄圧室ｄ内にサイク
ル変動の少ない安定した送油ができない不具合があった
。The fuel injection device conventionally used in diesel engines etc. discharges the fuel from the fuel injection pump star and sends the fuel to the pipe b[
When the pressure in the pressure accumulation chamber d inside the nozzle C overcomes the spring tK that biases the needle and the needle e rises, fuel is injected into the cylinder from the injection hole g at the tip of the nozzle C. The method is adopted. However, in this method, since the pump 1 and the nozzle C are connected by a high-pressure pipe, there is a problem that oil fluctuates in the pipe, making it impossible to stably feed oil into the pressure storage chamber d with little cycle fluctuation.

この発明はかかる不具合を改善する目的でなされ九もの
で、上記管路の途中にノズル側よりポンプ側へのみ絞り
機能を有する絞り弁を設けて管路中の圧力を安定させ九
エンジンの燃料噴射装置を提供して、燃料の安定した噴
射を可能とした本のである。This invention has been made for the purpose of improving this problem, and includes providing a throttle valve having a throttle function only from the nozzle side to the pump side in the middle of the above-mentioned pipe line to stabilize the pressure in the pipe line and to control the fuel injection of the engine. This book provides a device that enables stable injection of fuel.

以下この発明の一実施例を第２図に示す図面を参照して
詳述すると、図においてｌは燃料噴射ポンプで、該ポン
プ１より噴射された燃料は管路２により図示しないエン
ジンの各シリンダに設けられた噴射ノズル３へ供給され
るようになっている。上記管路２のポンプ１側には軟り
弁４が設けられている。上記絞り弁４は弁本体４ａ内に
はね４ｂによりポンプ１＠へ付勢貞れた絞り４Ｃが設け
られていて、この絞り４０によシ、ノズル３側からポン
プ１側へ戻る圧力のみが絞られるようになっている。Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawing shown in FIG. 2. In the figure, 1 is a fuel injection pump, and the fuel injected from the pump 1 is delivered to each cylinder of the engine (not shown) through a pipe 2. The water is supplied to an injection nozzle 3 provided in the. A softening valve 4 is provided on the pump 1 side of the pipeline 2. The throttle valve 4 is provided with a throttle 4C inside the valve body 4a, which is biased toward the pump 1@ by a spring 4b, and only the pressure that returns from the nozzle 3 side to the pump 1 side is through this throttle 40. It is being narrowed down.

一方管路２によりノズル３へ供給された燃料はニードル
７の頭部とチェック弁５を介して蓄圧室３麿へ導入され
る。On the other hand, the fuel supplied to the nozzle 3 through the conduit 2 is introduced into the pressure accumulation chamber 3 through the head of the needle 7 and the check valve 5.

上記蓄圧室３ａＫはばね６によシ開弁方向に付勢された
ニードル７が収容されていると共にこのニードル７の先
端でノズル３の先端に開口された噴孔３ｂが閉鎖されて
いる。The pressure accumulating chamber 3aK accommodates a needle 7 urged in the valve opening direction by a spring 6, and the nozzle hole 3b opened at the tip of the nozzle 3 is closed at the tip of the needle 7.

しかしてポンプｌより吐出された高圧燃料は絞り弁４の
絞り４Ｃを押し開いて管路２よりチェック弁５に達し、
ノズル３の蓄圧室３畠へ流入する。The high-pressure fuel discharged from the pump 1 pushes open the throttle 4C of the throttle valve 4 and reaches the check valve 5 through the pipe 2.
It flows into the pressure accumulation chamber 3 of the nozzle 3.

ポンプｌの圧送工程が終了すると、負の圧力波が管路２
を経てノズル３側へ伝播し、同時に絞り弁４の絞１４ｃ
が着座してノズル３側からの戻り圧力を絞１１４ｃＫよ
り絞る。これＫよシ管路２内には適正な圧力が保持され
、この圧力が次の噴射時期に管内圧力を安定させる作用
をなす。When the pump 1 completes the pumping process, a negative pressure wave is generated in the pipe 2.
It propagates to the nozzle 3 side through the
is seated and the return pressure from the nozzle 3 side is throttled down to 114cK. A proper pressure is maintained in the pipe line 2 through this K, and this pressure acts to stabilize the pressure inside the pipe at the next injection timing.

一方ノズル３に達した負の圧力波はチェック弁５を閉鎖
し、またニードル７の押圧も開放するため、ニードル７
は蓄圧室３ａ内の圧力により上昇されて噴孔３ｂを開放
し、蓄圧室３ａ内の燃料が噴孔６よりシリンダ内へ噴射
される。On the other hand, the negative pressure wave reaching the nozzle 3 closes the check valve 5 and also releases the pressure on the needle 7.
is increased by the pressure in the pressure accumulation chamber 3a to open the injection hole 3b, and the fuel in the pressure accumulation chamber 3a is injected into the cylinder from the injection hole 6.

燃料の噴射により蓄圧室３ａ内の圧力が低下するとはね
６によりニードル７が下降され、噴孔３ｂが閉鎖されて
噴射工程を終了する。なお、絞り弁４の絞り比は、絞り
面積／管路断面積−〇、１〜α３の範囲がよく、また絞
シ弁４は管路２に複数個設けてもよい。When the pressure in the pressure storage chamber 3a decreases due to fuel injection, the needle 7 is lowered by the spring 6, the injection hole 3b is closed, and the injection process is completed. The throttle ratio of the throttle valve 4 is preferably in the range of throttle area/pipe cross-sectional area - 0, 1 to α3, and a plurality of throttle valves 4 may be provided in the pipe line 2.

この発明は以上詳ピしたように、噴射ポンプとノズルを
接続する管路にノズル側よりポンプ側へ戻る圧力のみに
絞り機能を有する絞り弁を設けて、管路内の圧力を安定
させたことから、ノズル蓄圧室内の圧力のサイクル変動
が従来のものに比べて格段に少なくな抄、これによって
燃料の安定した噴射と、これに伴う燃焼効率の向上が図
れるようになる。As described in detail above, this invention stabilizes the pressure in the pipeline by providing a throttle valve that has a restricting function only on the pressure returning from the nozzle side to the pump side in the pipeline connecting the injection pump and the nozzle. Therefore, the cycle fluctuations in the pressure within the nozzle pressure storage chamber are much smaller than in the conventional system, which makes it possible to achieve stable injection of fuel and an associated improvement in combustion efficiency.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来の燃料噴射系の説明図、第２図はこの発明
の一実施例になる燃料噴射系の説明図である。 １は燃料噴射ポンプ、２は管路、３は噴射ノズル、４は
絞り弁。 出願人　　株式会社小松製作所 代理人　　　弁理士　米　原　正　章 弁理士　浜　本　　忠 第１図FIG. 1 is an explanatory diagram of a conventional fuel injection system, and FIG. 2 is an explanatory diagram of a fuel injection system according to an embodiment of the present invention. 1 is a fuel injection pump, 2 is a pipe, 3 is an injection nozzle, and 4 is a throttle valve. Applicant Komatsu Ltd. Representative Patent Attorney Masaaki Yonehara Patent Attorney Tadashi Hamamoto Figure 1

Claims (1)

【特許請求の範囲】[Claims] 燃料噴射ポンプｌとエンジンの各シリンダ毎に設けた噴
射ノズル３の間を接続する管路２にノズル３側からポン
プｌ側へ戻る方向にのみ絞り機能を有する絞シ弁４を設
けてなるエンジンの燃料噴射装置。An engine in which a throttle valve 4 having a throttle function only in the direction returning from the nozzle 3 side to the pump l side is provided in a pipe line 2 connecting between a fuel injection pump l and an injection nozzle 3 provided for each cylinder of the engine. fuel injector.
JP20992381A 1981-12-28 1981-12-28 Fuel injector in engine Pending JPS58113574A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP20992381A JPS58113574A (en) 1981-12-28 1981-12-28 Fuel injector in engine
GB08236408A GB2115066B (en) 1981-12-28 1982-12-22 I c engine fuel injection systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20992381A JPS58113574A (en) 1981-12-28 1981-12-28 Fuel injector in engine

Publications (1)

Publication Number Publication Date
JPS58113574A true JPS58113574A (en) 1983-07-06

Family

ID=16580899

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20992381A Pending JPS58113574A (en) 1981-12-28 1981-12-28 Fuel injector in engine

Country Status (2)

Country Link
JP (1) JPS58113574A (en)
GB (1) GB2115066B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004024528A1 (en) * 2004-05-18 2005-12-15 Robert Bosch Gmbh Fuel injection system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5551947A (en) * 1978-10-09 1980-04-16 Daihatsu Motor Co Ltd Fuel injection pump device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5551947A (en) * 1978-10-09 1980-04-16 Daihatsu Motor Co Ltd Fuel injection pump device

Also Published As

Publication number Publication date
GB2115066A (en) 1983-09-01
GB2115066B (en) 1986-02-26

Similar Documents

Publication Publication Date Title
US4758169A (en) Injection valve for reciprocating internal combustion engine
JP2539635B2 (en) Fuel injection system
US6220224B1 (en) Fuel-injection system for an internal combustion engine
US4077376A (en) Injection installation for diesel internal combustion engine
WO1999000595A3 (en) Fuel injection system
ATE294925T1 (en) FUEL INJECTION SYSTEM FOR AN INTERNAL COMBUSTION ENGINE
WO2001051797A3 (en) Control valve for an injector in a fuel injection system for internal combustion engines with pressure amplification in the control chamber
US20060000449A1 (en) Injection system for an internal-combustion engine
US6568927B1 (en) Piston pump for high-pressure fuel generation
US5651346A (en) Accumulator-type injection system
US5221046A (en) Methanol fueled diesel internal combustion engine fuel injector nozzle
DE3869652D1 (en) FUEL INJECTION PUMP.
WO2002063162A3 (en) Device for damping pressure pulsations in high-pressure injection systems
ATE13931T1 (en) INJECTION SYSTEM FOR INJECTING TWO FUELS THROUGH ONE INJECTOR.
JPS58113574A (en) Fuel injector in engine
US20080018101A1 (en) Return line connector
GB1299473A (en) Improvements in or relating to fuel injection valves for internal combustion engines
JPS56115849A (en) Fuel injection pump for internal combustion engine
GB1434066A (en) Fuel injection valve for an internal combustion engine
US2605141A (en) Fuel injection apparatus
JPH031505B2 (en)
JP2939268B2 (en) Fuel injection pump distribution and control valve
JP3748116B2 (en) Fuel injection device
ES2007194A6 (en) Fuel injection system.
US4046122A (en) Fuel feed control system of internal combustion engine