JP5604320B2 - Engine fuel supply system - Google Patents
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- JP5604320B2 JP5604320B2 JP2011013178A JP2011013178A JP5604320B2 JP 5604320 B2 JP5604320 B2 JP 5604320B2 JP 2011013178 A JP2011013178 A JP 2011013178A JP 2011013178 A JP2011013178 A JP 2011013178A JP 5604320 B2 JP5604320 B2 JP 5604320B2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Description
本発明は、エンジンの燃料供給装置に関し、詳しくは、燃料還流弁の配置の自由度が高く、エンジン出力の低下を抑制することができる、エンジンの燃料供給装置に関する。 The present invention relates to an engine fuel supply device, and more particularly to an engine fuel supply device that has a high degree of freedom in arrangement of a fuel recirculation valve and can suppress a decrease in engine output.
従来、エンジンの燃料供給装置として、エンジンに燃料圧送ポンプを取り付け、この燃料圧送ポンプで燃料インジェクタ側に燃料を圧送するようにし、燃料タンクから燃料供給通路を導出し、この燃料供給通路の通路途中に燃料フィルタを設け、この燃料供給通路の導出端に前記燃料圧送ポンプを連通させ、燃料タンク内の燃料を燃料フィルタを介して燃料圧送ポンプに供給し、この燃料圧送ポンプに燃料戻し通路を介して燃料タンクを連通させ、燃料圧送ポンプの余剰燃料を燃料戻し通路を介して燃料タンクに戻すようにし、燃料戻し通路の戻し燃料の一部を燃料フィルタに還流させる感温作動性の燃料還流弁を設け、この燃料還流弁の感温温度が所定値よりも低い場合には、この燃料還流弁を開弁状態に維持して、燃料戻し通路の戻し燃料の一部を燃料タンクに戻すことなく、燃料フィルタに還流させるようにしたものがある(例えば、特許文献１参照)。
この種のエンジンの燃料供給装置によれば、寒冷運転時に、エンジンの熱で加温された燃料圧送ポンプの余剰燃料を燃料フィルタに還流させ、燃料フィルタを目詰まりさせる燃料のワックス成分を溶かし、燃料圧送ポンプに燃料を支障なく供給することができる利点がある。
しかし、この従来技術では、燃料還流弁を、燃料フィルタケースに収容した感温伸縮性アクチュエータと弁体とで構成し、燃料フィルタケースの出口を通過するフィルタ出口燃料温度を感知した感温伸縮性アクチュエータの伸縮作動で弁体の開閉作動を行なわせるようにしているため、問題がある。
2. Description of the Related Art Conventionally, as a fuel supply device for an engine, a fuel pump is attached to the engine, the fuel is pumped to the fuel injector by the fuel pump, a fuel supply passage is led out from the fuel tank, and the fuel supply passage is in the middle of the passage. The fuel pressure feed pump is connected to the lead-out end of the fuel supply passage, and the fuel in the fuel tank is supplied to the fuel pressure feed pump via the fuel filter. The fuel pressure feed pump is connected to the fuel pressure feed pump via the fuel return passage. The fuel tank is connected, the surplus fuel of the fuel pressure pump is returned to the fuel tank via the fuel return passage, and a part of the return fuel in the fuel return passage is returned to the fuel filter. When the temperature sensing temperature of the fuel recirculation valve is lower than a predetermined value, the fuel recirculation valve is maintained in the open state and the return fuel in the fuel return passage is maintained. Without returning to the fuel tank part of, it is that so as to reflux the fuel filter (e.g., see Patent Document 1).
According to this type of engine fuel supply device, during cold operation, excess fuel of the fuel pressure pump heated by the engine heat is returned to the fuel filter, and the wax component of the fuel that clogs the fuel filter is dissolved. There is an advantage that the fuel can be supplied to the fuel pump without trouble.
However, in this prior art, the fuel recirculation valve is composed of a temperature-sensitive elastic actuator and a valve body housed in a fuel filter case, and the temperature-sensitive elastic property that senses the fuel temperature at the filter outlet passing through the outlet of the fuel filter case. There is a problem because the opening / closing operation of the valve body is performed by the expansion / contraction operation of the actuator.
《問題》 燃料還流弁の配置の自由度が低い。
燃料還流弁を、燃料フィルタケースに収容した感温伸縮性アクチュエータと弁体とで構成しているため、燃料還流弁の配置が燃料フィルタケースの位置に制限され、燃料還流弁の配置の自由度が低い。
<Problem> The degree of freedom in arranging the fuel recirculation valve is low.
Since the fuel recirculation valve is composed of a temperature-sensitive elastic actuator housed in the fuel filter case and the valve body, the arrangement of the fuel recirculation valve is limited to the position of the fuel filter case, and the degree of freedom of the arrangement of the fuel recirculation valve Is low.
《問題》 エンジン出力が低下しやすい。
燃料フィルタケースの出口を通過するフィルタ出口燃料温度を感知した感温伸縮性アクチュエータの伸縮作動で弁体の開閉作動を行なわせるようにしているため、燃料圧送ポンプの燃料温度が高まり、戻し燃料の温度が上昇しても、感温伸縮性アクチュエータが感知するのは、戻し燃料の一部と燃料タンクからの低温の燃料とが混合されたフィルタ出口燃料温度であり、弁体が速やかに閉弁側に作動することがなく、戻し燃料が不要に長く燃料供給ポンプに還流され、燃料圧送ポンプの燃料温度が上昇を続け、燃料密度の低下により、エンジン出力が低下しやすい。
<Problem> Engine output tends to decrease.
Since the valve body is opened and closed by the expansion and contraction operation of the temperature-sensitive elastic actuator that senses the fuel temperature at the filter outlet passing through the outlet of the fuel filter case, the fuel temperature of the fuel pump increases and the return fuel Even if the temperature rises, the temperature-sensitive elastic actuator senses the fuel temperature at the filter outlet where a part of the return fuel and the low-temperature fuel from the fuel tank are mixed, and the valve body closes quickly. The return fuel is recirculated to the fuel supply pump unnecessarily for a long time, the fuel temperature of the fuel pump continues to rise, and the engine output tends to decrease due to a decrease in fuel density.
本発明の課題は、燃料還流弁の配置の自由度が高く、エンジン出力の低下を抑制することができる、エンジンの燃料供給装置を提供することにある。 The subject of this invention is providing the fuel supply apparatus of an engine which has the high freedom degree of arrangement | positioning of a fuel recirculation valve, and can suppress the fall of an engine output.
(請求項１と請求項２に係る発明に共通の発明特定事項)
図１または図４に例示するように、エンジン(１)に燃料圧送ポンプ(２)を取り付け、この燃料圧送ポンプ(２)で燃料インジェクタ(３)側に燃料を圧送するようにし、
燃料タンク(４)から燃料供給通路(５)を導出し、この燃料供給通路(５)の通路途中に燃料フィルタ(６)を設け、この燃料供給通路(５)の導出端に前記燃料圧送ポンプ(２)を連通させ、燃料タンク(４)内の燃料(８)を燃料フィルタ(６)を介して燃料圧送ポンプ(２)に供給し、
この燃料圧送ポンプ(２)に燃料戻し通路(７)を介して燃料タンク(４)を連通させ、燃料圧送ポンプ(２)の余剰燃料を燃料戻し通路(７)を介して燃料タンク(４)に戻すようにし、
燃料戻し通路(６)燃料戻し通路(７)の戻し燃料(９)の一部を燃料フィルタ(６)に還流させる感温作動性の燃料還流弁(１０)を設け、この燃料還流弁(１０)の感温温度が所定値よりも低い場合には、この燃料還流弁(１０)を開弁状態に維持して、燃料戻し通路(７)の戻し燃料(９)の一部を燃料タンク(４)に戻すことなく、燃料フィルタ(６)に還流させるようにした、エンジンの燃料供給装置において、
図１または図４に例示するように、燃料戻し通路(７)から燃料還流通路(１２)を分岐させ、この燃料還流通路(１２)の分岐端を、燃料フィルタ(６)よりも上流で燃料供給通路(５)に連通させ、この燃料還流通路(１２)に前記燃料還流弁(１０)を設け、
図２(Ａ)(Ｂ)、図３(Ａ)または図３(Ｂ)に例示するように、この燃料還流弁(１０)を、燃料フィルタ(６)の燃料フィルタケース(１３)とは別体の弁ケース(１４)と、この弁ケース(１４)のケース内燃料通路(１５)に収容された感温伸縮性アクチュエータ(１６)と弁体(１７)とで構成し、
ケース内燃料通路(１５)を通過する戻し燃料(９)の温度を感知した感温伸縮性アクチュエータ(１６)の伸縮作動で弁体(１７)の開閉作動を行わせるようにし、
図２(Ａ)(Ｂ)、図３(Ａ)または図３(Ｂ)に例示するように、弁ケース(１４)とケース内燃料通路(１５)とをいずれも真っ直ぐに形成し、
ケース内燃料通路(１５)の上流端に燃料入口(１８)を、ケース内燃料通路(１５)の下流端に燃料出口(１９)を設け、ケース内燃料通路(１５)の上流側通路部分(２０)に感温伸縮性アクチュエータ(１６)を、下流側通路部分(２１)に弁体(１７)をそれぞれ収容した。
(請求項１に係る発明に固有の発明特定事項)
図２(Ａ)(Ｂ)に例示するように、ケース内燃料通路(１５)の下流側通路部分(２１)に弁座(４１)を設け、感温伸縮性アクチュエータ(１６)の感温ケース(３６)から出力軸(３７)を突出させ、この出力軸(３７)に弁体(１７)を取り付け、感温ケース(３６)からの出力軸(３７)の突出で弁体(１７)を弁座(４１)に受け止めさせて、燃料還流弁(１０)の閉弁を行うようにし、
図２(Ａ)(Ｂ)に例示するように、ケース内燃料通路(１５)に受け座(４２)を設け、感温ケース(３６)に係止部(４３)を設け、感温ケース(３６)を支持スプリング(４４)で付勢し、この支持スプリング(４４)の付勢力(４５)で係止部(４３)を受け座(４２)に受け止めさせて、ケース内燃料通路(１５)で感温ケース(３６)を支持させることにより、
弁体(１７)を弁座(４１)に受け止めさせた後、更に感温ケース(３６)から出力軸(３７)が突出する場合には、支持スプリング(４４)の付勢力(４５)に抗して、感温ケース(３６)が弁体(１７)から離れるようにした。
(請求項２に係る発明に固有の発明特定事項)
図３(Ａ)または図３(Ｂ)に例示するように、弁体(１７)に弁体内部孔(２２)を設け、弁体内部孔(２２)は弁体(１７)の径方向に沿う弁体入口孔(２３)とこの弁体入口孔(２３)から弁体(１７)の摺動方向に伸びる弁体出口孔(２４)とで構成し、
弁体入口孔(２３)の入口開口(２５)を弁体(１７)の外周面で開口させ、弁体(１７)の外周面をケース内燃料通路(１５)の下流側通路部分(２１)の内周面に摺動自在に内嵌させ、この下流側通路部分(２１)の上流にこの下流側通路部分(２１)よりも径大の燃料溜め室(２６)を設け、
感温伸縮性アクチュエータ(１６)の伸縮作動で弁体(１７)の摺動位置を調節することにより、燃料溜め室(２６)に臨む弁体入口孔(２３)の入口開口(２５)の露出面積を変えて、弁体(１７)の弁開度を設定することができるようにした。
(Invention-specific matters common to the inventions of claims 1 and 2)
As illustrated in FIG. 1 or FIG. 4, a fuel pump (2) is attached to the engine (1), and the fuel is pumped to the fuel injector (3) by the fuel pump (2).
A fuel supply passage (5) is led out from the fuel tank (4), a fuel filter (6) is provided in the middle of the fuel supply passage (5), and the fuel pump is provided at the lead-out end of the fuel supply passage (5). (2) is connected, and the fuel (8) in the fuel tank (4) is supplied to the fuel pump (2) through the fuel filter (6).
A fuel tank (4) is communicated with the fuel pump (2) via a fuel return passage (7), and surplus fuel from the fuel pump (2) is passed through the fuel return passage (7) to the fuel tank (4). To return to
The fuel return passage (6) is provided with a temperature-sensitive fuel recirculation valve (10) for recirculating a part of the return fuel (9) of the fuel return passage (7) to the fuel filter (6). ) Is lower than a predetermined value, the fuel recirculation valve (10) is maintained in an open state, and a part of the return fuel (9) in the fuel return passage (7) is supplied to the fuel tank ( 4) In the fuel supply device for the engine, the fuel filter (6) is recirculated without returning to 4).
As illustrated in FIG. 1 or FIG. 4, the fuel return passage (12) is branched from the fuel return passage (7), and the branch end of the fuel return passage (12) is fueled upstream of the fuel filter (6). The fuel recirculation valve (10) is provided in the fuel recirculation passage (12).
As illustrated in FIG. 2 (A) (B), FIG. 3 (A) or FIG. 3 (B), this fuel recirculation valve (10) is separated from the fuel filter case (13) of the fuel filter (6). A body valve case (14), a temperature-sensitive elastic actuator (16) housed in a fuel passage (15) in the case of the valve case (14), and a valve body (17),
The opening / closing operation of the valve body (17) is performed by the expansion / contraction operation of the temperature-sensitive elastic actuator (16) that senses the temperature of the return fuel (9) passing through the fuel passage (15) in the case ,
As illustrated in FIGS. 2 (A), 2 (B), 3 (A), or 3 (B), the valve case (14) and the fuel passage (15) in the case are both formed straight,
A fuel inlet (18) is provided at the upstream end of the in-case fuel passage (15), a fuel outlet (19) is provided at the downstream end of the in-case fuel passage (15), and an upstream side passage portion of the in-case fuel passage (15) ( The temperature-sensitive elastic actuator (16) is accommodated in 20), and the valve element (17) is accommodated in the downstream passage portion (21).
( Invention-specific matters specific to the invention of claim 1 )
2 (A) and 2 (B), a valve seat (41) is provided in the downstream passage portion (21) of the in-case fuel passage (15), and the temperature sensitive case of the temperature-sensitive elastic actuator (16). The output shaft (37) is protruded from (36), the valve body (17) is attached to the output shaft (37), and the valve body (17) is mounted by the protrusion of the output shaft (37) from the temperature sensitive case (36). The valve seat (41) is received and the fuel recirculation valve (10) is closed,
2 (A) and 2 (B), a receiving seat (42) is provided in the fuel passage (15) in the case, a locking part (43) is provided in the temperature sensitive case (36), and a temperature sensitive case ( 36) is biased by the support spring (44), and the latching portion (43) is received by the seat (42) by the biasing force (45) of the support spring (44), so that the fuel passage (15) in the case is received. By supporting the temperature sensitive case (36) with
When the output shaft (37) further protrudes from the temperature sensing case (36) after the valve body (17) is received by the valve seat (41), it resists the urging force (45) of the support spring (44). Thus, the temperature sensitive case (36) was separated from the valve body (17).
( Invention-specific matters specific to the invention of claim 2 )
As illustrated in FIG. 3 (A) or FIG. 3 (B), the valve body (17) is provided with a valve body internal hole (22), and the valve body internal hole (22) is formed in the radial direction of the valve body (17). And a valve body outlet hole (24) extending from the valve body inlet hole (23) in the sliding direction of the valve body (17).
The inlet opening (25) of the valve body inlet hole (23) is opened at the outer peripheral surface of the valve body (17), and the outer peripheral surface of the valve body (17) is connected to the downstream side passage portion (21) of the fuel passage (15) in the case. A
Exposure of the inlet opening (25) of the valve body inlet hole (23) facing the fuel reservoir chamber (26) by adjusting the sliding position of the valve body (17) by the expansion and contraction operation of the temperature-sensitive elastic actuator (16). The valve opening degree of the valve body (17) can be set by changing the area.
(請求項１に係る発明)
請求項１に係る発明は、次の効果を奏する。
《効果１−１》 燃料還流弁の配置の自由度が高い。
図２(Ａ)(Ｂ)に例示するように、燃料還流弁(１０)を、燃料フィルタ(６)の燃料フィルタケース(１３)とは別体の弁ケース(１４)と、この弁ケース(１４)のケース内燃料通路(１５)に収容された感温伸縮性アクチュエータ(１６)と弁体(１７)とで構成したので、燃料還流弁(１０)の配置が燃料フィルタケース(１３)の位置に制限されることがなく、燃料還流弁(１０)の配置の自由度が高い。
(Invention of Claim 1)
The invention according to claim 1 has the following effects.
<< Effect 1-1 >> The degree of freedom of arrangement of the fuel recirculation valve is high.
As illustrated in FIGS. 2A and 2B , the fuel recirculation valve (10) includes a valve case (14) separate from the fuel filter case (13) of the fuel filter (6), and the valve case ( 14) Since the temperature-sensitive elastic actuator (16) and the valve body (17) housed in the in-case fuel passage (15) are configured, the arrangement of the fuel recirculation valve (10) is the same as that of the fuel filter case (13). The position of the fuel recirculation valve (10) is high without being limited by the position.
《効果１−２》 エンジン出力の低下を抑制することができる。
図２(Ａ)(Ｂ)に例示するように、ケース内燃料通路(１５)を通過する戻し燃料(９)の温度を感知した感温伸縮性アクチュエータ(１６)の伸縮作動で弁体(１７)の開閉作動を行なわせるようにしたので、燃料圧送ポンプ(２)の燃料温度が高まり、戻し燃料(９)の温度が上昇すると、この温度上昇を感温伸縮性アクチュエータ(１６)が速やかに感知し、弁体(１７)が速やかに閉弁側に作動し、戻し燃料(９)が不要に長く燃料圧送ポンプ(２)に還流する不具合が無く、燃料圧送ポンプ(２)の燃料温度の上昇、燃料密度の低下に起因するエンジン出力の低下を抑制することができる。
<< Effect 1-2 >> Decrease in engine output can be suppressed.
As illustrated in FIGS. 2A and 2B , the valve body (17) is expanded and contracted by a temperature-sensitive elastic actuator (16) that senses the temperature of the return fuel (9) passing through the fuel passage (15) in the case. When the fuel temperature of the fuel pump (2) increases and the temperature of the return fuel (9) rises, the temperature-sensitive elastic actuator (16) promptly causes the temperature rise. The valve body (17) is quickly moved to the valve closing side, and the return fuel (9) is not unnecessarily long recirculated to the fuel pressure pump (2), and the fuel temperature of the fuel pressure pump (2) is reduced. It is possible to suppress a decrease in engine output due to an increase and a decrease in fuel density.
《効果１−３》 燃料還流弁を真っ直ぐでコンパクトな形状にまとめることができる。
図２(Ａ)(Ｂ)に例示するように、燃料還流弁ケース(１４)とケース内燃料通路(１５)とをいずれも真っ直ぐに形成し、ケース内燃料通路(１５)の上流端に燃料入口(１８)を、ケース内燃料通路(１５)の下流端に燃料出口(１９)を設け、ケース内燃料通路(１５)の上流側通路部分(２０)に感温伸縮性アクチュエータ(１６)を、下流側通路部分(２１)に弁体(１７)をそれぞれ収容したので、燃料還流弁(１０)を真っ直ぐでコンパクトな形状にまとめることができる。
< Effect 1-3 > The fuel recirculation valve can be combined into a straight and compact shape.
2A and 2B , the fuel recirculation valve case (14) and the in-case fuel passage (15) are both formed straight, and the fuel is provided at the upstream end of the in-case fuel passage (15). The inlet (18) is provided with a fuel outlet (19) at the downstream end of the fuel passage (15) in the case, and the temperature-sensitive elastic actuator (16) is provided in the upstream passage portion (20) of the fuel passage (15) in the case. Since the valve elements (17) are accommodated in the downstream passage portions (21), the fuel recirculation valve (10) can be combined into a straight and compact shape.
《効果１−４》 燃料供給ポンプの燃料温度の上昇を速やかに感知することができる。
図２(Ａ)(Ｂ)に例示するように、ケース内燃料通路(１５)の上流側通路部分(２０)に感温伸縮性アクチュエータ(１６)を、下流側通路部分(２１)に弁体(１７)をそれぞれ収容したので、戻し燃料(９)が感温伸縮性アクチュエータ(１６)や弁体(１７)の全体に接触し、燃料圧送ポンプ(２)の燃料温度の上昇を速やかに感知することができる。
<< Effect 1-4 >> An increase in the fuel temperature of the fuel supply pump can be quickly detected.
2 (A) and 2 (B) , the temperature-sensitive elastic actuator (16) is provided in the upstream passage portion (20) of the fuel passage (15) in the case, and the valve body is provided in the downstream passage portion (21). Since (17) is accommodated, the return fuel (9) comes into contact with the entire temperature-sensitive elastic actuator (16) and the valve body (17), and promptly senses an increase in the fuel temperature of the fuel pump (2). can do.
《効果１−５》 簡易な構造の弁体を用いることができる。
図２(Ａ)(Ｂ)に例示するように、ケース内燃料通路(１５)の下流側通路部分(２１)に弁座(４１)を設け、感温伸縮性アクチュエータ(１６)の感温ケース(３６)から出力軸(３７)を突出させ、この出力軸(３７)に弁体(１７)を取り付け、感温ケース(３６)からの出力軸(３７)の突出で弁体(１７)を弁座(４１)に受け止めさせて、燃料還流弁(１０)の閉弁を行うようにしたので、簡易な構造の弁体を用いることができる。
<< Effect 1-5 >> A valve body having a simple structure can be used.
2 (A) and 2 (B), a valve seat (41) is provided in the downstream passage portion (21) of the in-case fuel passage (15), and the temperature sensitive case of the temperature-sensitive elastic actuator (16). The output shaft (37) is protruded from (36), the valve body (17) is attached to the output shaft (37), and the valve body (17) is mounted by the protrusion of the output shaft (37) from the temperature sensitive case (36). Since the fuel recirculation valve (10) is closed by being received by the valve seat (41), a valve body having a simple structure can be used.
《効果１−６》 感温伸縮性アクチュエータが閉弁後の伸長で破損するのを防止することができる。
図２(Ａ)(Ｂ)に例示するように、弁体(１７)を弁座(４１)に受け止させた後、更に感温ケース(３６)から出力軸(３７)が突出する場合には、支持スプリング(４４)の付勢力(４５)に抗して、感温ケース(３６)が弁体(１７)から離れるようにしたので、感温伸縮性アクチュエータ(１６)が閉弁後の伸長で破損するのを防止することができる。
<< Effect 1-6 >> It can prevent that a temperature-sensitive elastic actuator is damaged by the expansion | extension after valve closing.
As illustrated in FIGS. 2A and 2B, when the output shaft (37) further protrudes from the temperature sensing case (36) after the valve body (17) is received by the valve seat (41). Since the temperature sensitive case (36) is separated from the valve body (17) against the biasing force (45) of the support spring (44), the temperature sensitive elastic actuator (16) is It is possible to prevent breakage due to elongation.
(請求項２に係る発明)
請求項２に係る発明は、請求項１の効果１−１〜１−４(効果の記載中、図２(Ａ)(Ｂ)は、図３(Ａ)または図３(Ｂ)と読み替える)に加え、次の効果を奏する。
《効果》 ケース内燃料通路を通過する戻し燃料の流量調節を容易に行うことができる。
図３(Ａ)または図３(Ｂ)に例示するように、感温伸縮性アクチュエータ(１６)の伸縮作動で弁体(１７)の摺動位置を調節することにより、燃料溜め室(２６)に臨む弁体入口孔(２３)の入口開口(２５)の露出面積を変えて、弁体(１７)の弁開度を設定することができるようにしたので、入口開口(２５)の開口面積が異なる弁体(１７)を交換することにより、ケース内燃料通路(１５)を通過する戻し燃料(９)の流量調節を容易に行うことができる。
(Invention of Claim 2 )
The invention according to
<Effect> It is possible to easily adjust the flow rate of the return fuel passing through the in-case fuel passage.
As illustrated in FIG. 3 (A) or FIG. 3 (B), the fuel reservoir chamber (26) is obtained by adjusting the sliding position of the valve element (17) by the expansion / contraction operation of the temperature-sensitive elastic actuator (16). The valve opening degree of the valve body (17) can be set by changing the exposed area of the inlet opening (25) of the valve body inlet hole (23) that faces the opening area of the inlet opening (25). By exchanging the valve bodies (17) having different values, the flow rate of the return fuel (9) passing through the in-case fuel passage (15) can be easily adjusted.
図１〜図３は本発明の第１実施形態に係るエンジンの燃料供給装置を説明する図、図４は本発明の第２実施形態に係るエンジンの燃料供給装置を説明する図である。 1 to 3 are diagrams for explaining an engine fuel supply apparatus according to a first embodiment of the present invention, and FIG. 4 is a view for explaining an engine fuel supply apparatus according to a second embodiment of the present invention.
第１実施形態について説明する。
図１に示す第１実施形態に係るエンジンの燃料供給装置は、コモンレール式ディーゼルエンジンの燃料供給装置である。
図１に示すように、エンジン(１)に燃料圧送ポンプ(２)を取り付け、この燃料圧送ポンプ(２)で燃料インジェクタ(３)側に燃料を圧送するようにしている。
燃料圧送ポンプ(２)は燃料サプライポンプ(３０)であり、この燃料サプライポンプ(３０)で圧送した燃料(８)をコモンレール(３１)に蓄圧し、燃料インジェクタ(３)の電磁弁の開閉で燃料インジェクタ(３)から燃焼室に燃料(８)を噴射するようにしている。
燃料タンク(４)から燃料供給通路(５)を導出し、この燃料供給通路(５)の通路途中に燃料フィルタ(６)を設け、この燃料供給通路(５)の導出端に前記燃料圧送ポンプ(２)を連通させ、燃料タンク(４)内の燃料(８)を燃料フィルタ(６)を介して燃料圧送ポンプ(２)に供給するようにしている。
燃料供給通路(５)には、上流側から順に燃料セジメンタ(３３)、燃料クーラ(３４)、燃料フィードポンプ(３５)、燃料フィルタ(６)を配置し、燃料タンク(４)内の燃料(８)を燃料フィードポンプ(３５)で吸い出し、燃料セジメンタ(３３)で燃料(８)から水分を分離し、燃料クーラ(３４)で燃料(８)を冷却し、燃料フィードポンプ(３５)で燃料(８)を燃料フィルタ(６)に送り出し、燃料フィルタ(６)で燃料(８)から固形の不純物を分離し、燃料圧送ポンプ(２)に燃料(８)を供給する。
A first embodiment will be described.
The fuel supply device for an engine according to the first embodiment shown in FIG. 1 is a fuel supply device for a common rail diesel engine.
As shown in FIG. 1, a fuel pump (2) is attached to the engine (1), and the fuel is pumped to the fuel injector (3) by the fuel pump (2).
The fuel pressure pump (2) is a fuel supply pump (30). The fuel (8) pressure-fed by the fuel supply pump (30) is accumulated in the common rail (31), and the solenoid valve of the fuel injector (3) is opened and closed. The fuel (8) is injected from the fuel injector (3) into the combustion chamber.
A fuel supply passage (5) is led out from the fuel tank (4), a fuel filter (6) is provided in the middle of the fuel supply passage (5), and the fuel pump is provided at the lead-out end of the fuel supply passage (5). (2) is connected, and the fuel (8) in the fuel tank (4) is supplied to the fuel pump (2) through the fuel filter (6).
In the fuel supply passage (5), a fuel segmenter (33), a fuel cooler (34), a fuel feed pump (35), and a fuel filter (6) are arranged in this order from the upstream side, and the fuel in the fuel tank (4) ( 8) is sucked out by the fuel feed pump (35), the water is separated from the fuel (8) by the fuel separator (33), the fuel (8) is cooled by the fuel cooler (34), and the fuel is fed by the fuel feed pump (35). (8) is sent to the fuel filter (6), the solid impurities are separated from the fuel (8) by the fuel filter (6), and the fuel (8) is supplied to the fuel pump (2).
燃料圧送ポンプ(２)に燃料戻し通路(７)を介して燃料タンク(４)を連通させ、燃料圧送ポンプ(２)の余剰燃料を燃料戻し通路(７)を介して燃料タンク(４)に戻すようにしている。
燃料インジェクタ(３)の余剰燃料も燃料戻し通路(７)を介して燃料タンク(４)に戻すようにしている。
燃料戻し通路(７)の戻し燃料(９)の一部を燃料フィルタ(６)に還流させる感温作動性の燃料還流弁(１０)を設け、この燃料還流弁(１０)の感温温度が所定値よりも低い場合には、この燃料還流弁(１０)を開弁状態に維持して、燃料戻し通路(７)の戻し燃料(９)の一部を燃料タンク(４)に戻すことなく、燃料フィルタ(６)に還流させるようにしている。
The fuel tank (4) is connected to the fuel pump (2) via the fuel return passage (7), and excess fuel from the fuel pump (2) is transferred to the fuel tank (4) via the fuel return passage (7). I try to return it.
Excess fuel in the fuel injector (3) is also returned to the fuel tank (4) via the fuel return passage (7).
A temperature-sensitive operating fuel recirculation valve (10) for recirculating part of the return fuel (9) in the fuel return passage (7) to the fuel filter (6) is provided. If it is lower than the predetermined value, the fuel recirculation valve (10) is maintained in an open state without returning a part of the return fuel (9) in the fuel return passage (7) to the fuel tank (4). The fuel filter (6) is refluxed.
図１に示すように、燃料戻し通路(７)から燃料還流通路(１２)を分岐させ、この燃料還流通路(１２)の分岐端を、燃料フィルタ(６)よりも上流で燃料供給通路(５)に連通させ、この燃料還流通路(１２)に前記燃料還流弁(１０)を設けている。
燃料戻し通路(７)には逆止弁(３２)を取り付け、燃料タンク(４)からのエアの吸い込みを防止している。
燃料フィルタ供給通路(１２)は、逆止弁(３２)よりも上流の位置で、燃料戻し通路(７)から分岐させ、燃料セジメンタ(３３)よりも上流の位置で、燃料供給通路(５)に連通させている。
As shown in FIG. 1, the fuel return passage (12) is branched from the fuel return passage (7), and the branch end of the fuel return passage (12) is disposed upstream of the fuel filter (6). The fuel recirculation valve (10) is provided in the fuel recirculation passage (12).
A check valve (32) is attached to the fuel return passage (7) to prevent air from being sucked from the fuel tank (4).
The fuel filter supply passage (12) is branched from the fuel return passage (7) at a position upstream of the check valve (32), and at a position upstream of the fuel segmenter (33), the fuel supply passage (5). Communicating with
図２(Ａ)(Ｂ)は燃料還流弁の基本例を示している。
図２(Ａ)(Ｂ)に示すように、燃料還流弁(１０)を、燃料フィルタ(６)の燃料フィルタケース(１３)とは別体の弁ケース(１４)と、この弁ケース(１４)のケース内燃料通路(１５)に収容された感温伸縮性アクチュエータ(１６)と弁体(１７)とで構成している。
ケース内燃料通路(１５)を通過する戻し燃料(９)の温度を感知した感温伸縮性アクチュエータ(１６)の伸縮作動で弁体(１７)の開閉作動を行なわせるようにしている。
2A and 2B show a basic example of the fuel recirculation valve.
As shown in FIGS. 2 (A) and 2 (B), the fuel recirculation valve (10) includes a valve case (14) separate from the fuel filter case (13) of the fuel filter (6), and the valve case (14 ) Of the temperature-sensitive elastic actuator (16) and the valve body (17) accommodated in the in-case fuel passage (15).
The valve body (17) is opened / closed by the expansion / contraction operation of the temperature-sensitive elastic actuator (16) that senses the temperature of the return fuel (9) passing through the fuel passage (15) in the case.
弁体(１７)は、戻しバネ(３８)の付勢力で開弁方向に付勢している。感温伸縮性アクチュエータ(１６)は、感温ケース(３６)にワックスペレットを収容し、感温ケース(３６)から出力軸(３７)を突出させたもので、この出力軸(３７)に弁体(１７)を連結している。感温ケース(３６)の感温温度が所定値よりも低い場合には、ワックスペレットが固化状態で、出力軸(３７)は感温ケース(３６)内に引き込まれ、感温伸縮性アクチュエータ(１６)は収縮状態となり、弁体(１７)は戻しバネ(３８)の付勢力で全開状態に維持される。感温ケース(３６)の感温温度が上昇するにつれて、ワックスペレットが徐々に液化し、出力軸(３７)が徐々に押し出され、感温伸縮性アクチュエータ(１６)は伸長し、戻しバネ(３８)の付勢力に抗して、弁体(１７)を閉弁側に作動させる。 The valve body (17) is urged in the valve opening direction by the urging force of the return spring (38). The temperature-sensitive elastic actuator (16) has wax pellets accommodated in a temperature-sensitive case (36) and has an output shaft (37) protruding from the temperature-sensitive case (36). A valve is connected to the output shaft (37). The body (17) is connected. When the temperature sensing temperature of the temperature sensing case (36) is lower than a predetermined value, the wax pellets are solidified, the output shaft (37) is drawn into the temperature sensing case (36), and the temperature sensing elastic actuator ( 16) is in a contracted state, and the valve body (17) is maintained in the fully open state by the urging force of the return spring (38). As the temperature sensing temperature of the temperature sensing case (36) rises, the wax pellets gradually liquefy, the output shaft (37) is gradually pushed out, the temperature sensitive elastic actuator (16) expands, and the return spring (38 The valve element (17) is actuated to the valve closing side against the urging force.
図２(Ａ)(Ｂ)に示すように、弁ケース(１４)とケース内燃料通路(１５)とをいずれも真っ直ぐに形成している。
ケース内燃料通路(１５)の上流端に燃料入口(１８)を、ケース内燃料通路(１５)の下流端に燃料出口(１９)を設け、ケース内燃料通路(１５)の上流側通路部分(２０)に感温伸縮性アクチュエータ(１６)を、下流側通路部分(２１)に弁体(１７)をそれぞれ収容している。
As shown in FIGS. 2 (A) and 2 (B), both the valve case (14) and the in-case fuel passage (15) are formed straight.
A fuel inlet (18) is provided at the upstream end of the in-case fuel passage (15), a fuel outlet (19) is provided at the downstream end of the in-case fuel passage (15), and an upstream side passage portion of the in-case fuel passage (15) ( 20) accommodates a temperature-sensitive elastic actuator (16), and a downstream passage portion (21) accommodates a valve element (17).
図２(Ａ)(Ｂ)に示すように、ケース内燃料通路(１５)の下流側通路部分(２１)に弁座(４１)を設け、感温伸縮性アクチュエータ(１６)の感温ケース(３６)から出力軸(３７)を突出させ、この出力軸(３７)に弁体(１７)を取り付け、感温ケース(３６)からの出力軸(３７)の突出で弁体(１７)を弁座(４１)に受け止めさせて、燃料還流弁(１０)の閉弁を行うようにしている。 As shown in FIGS. 2 (A) and 2 (B), a valve seat (41) is provided in the downstream passage portion (21) of the fuel passage (15) in the case, and a temperature sensitive case ( 36), the output shaft (37) protrudes from the output shaft (37), and the valve body (17) is attached to the output shaft (37). The seat (41) is received and the fuel recirculation valve (10) is closed.
図２(Ａ)(Ｂ)に示すように、ケース内燃料通路(１５)に受け座(４２)を設け、感温ケース(３６)に係止部(４３)を設け、感温ケース(３６)を支持スプリング(４４)で付勢し、この支持スプリング(４４)の付勢力(４５)で係止部(４３)を受け座(４２)に受け止めさせて、ケース内燃料通路(１５)で感温ケース(３６)を支持させている。
これにより、弁体(１７)が弁座(４１)に受け止められた後、更に感温ケース(３６)から出力軸(３７)が突出する場合には、支持スプリング(４４)の付勢力(４５)に抗して、感温ケース(３６)が弁体(１７)から離れるようにしている。
2A and 2B, a receiving seat (42) is provided in the fuel passage (15) in the case, a locking part (43) is provided in the temperature sensitive case (36), and the temperature sensitive case (36 ) Is urged by the support spring (44), and the latching portion (43) is received by the receiving seat (42) by the urging force (45) of the support spring (44), and the fuel passage (15) in the case A temperature sensitive case (36) is supported.
Thereby, after the valve body (17) is received by the valve seat (41), when the output shaft (37) further protrudes from the temperature sensing case (36), the biasing force (45) of the support spring (44) is obtained. The temperature sensing case (36) is separated from the valve body (17) against this.
ケース内燃料通路(１５)の上流側通路部分(２０)にスプリング取り付け基部(４６)を設け、感温ケース(３６)にスプリングリテーナ(４７)を設け、スプリング取り付け基部(４６)とスプリングリテーナ(４７)との間に支持スプリング(４４)を配置している。スプリング取り付け基部(４６)に燃料通過孔(４８)と感温ケース貫通孔(４９)とを設け、感温ケース貫通孔(４９)には感温ケース(３６)を摺動自在に内嵌させている。スプリングリテーナ(４７)は円錐台部(５２)の開拡する終端部の径方向外側にフランジ状の一対の係止部(４３)(４３)を突出させて構成している。この一対の係止部(４３)(４３)で支持スプリング(４４)を受け止めるとともに、この一対の係止部(４３)(４３)を受け座(４２)に受け止めさせ、円錐台部(５２)の終端部と受け座(４２)との間に燃料通過隙間(５０)を保持している。
弁体(１７)には、溝状の燃料リーク部(５１)を設け、弁体(１７)が閉弁していても、燃料リーク部(５１)から少量の戻し燃料(９)が燃料出口(１９)側にリークし、戻し燃料(９)が常に感温ケース(３６)に沿って流れるようにしている。
A spring mounting base (46) is provided in the upstream side passage portion (20) of the fuel passage in the case (15), a spring retainer (47) is provided in the temperature sensitive case (36), and the spring mounting base (46) and the spring retainer ( 47) is arranged between the support spring (44). The spring mounting base (46) is provided with a fuel passage hole (48) and a temperature sensing case through hole (49), and the temperature sensing case (36) is slidably fitted in the temperature sensing case through hole (49). ing. The spring retainer (47) is configured by projecting a pair of flange-like locking portions (43) and (43) on the radially outer side of the end portion of the frustoconical portion (52). The pair of locking portions (43) and (43) receive the support spring (44), and the pair of locking portions (43) and (43) are received by the receiving seat (42), and the truncated cone portion (52). A fuel passage gap (50) is held between the terminal end of the fuel and the seat (42).
The valve body (17) is provided with a groove-shaped fuel leak portion (51), and even if the valve body (17) is closed, a small amount of return fuel (9) is discharged from the fuel leak portion (51) to the fuel outlet. It leaks to the (19) side so that the return fuel (9) always flows along the temperature sensitive case (36).
図３(Ａ)は燃料還流弁(１０)の第１変形例を示しており、この第１変形例では、弁体(１７)に弁体内部孔(２２)を設け、弁体内部孔(２２)は弁体(１７)の径方向に沿う弁体入口孔(２３)とこの弁体入口孔(２３)から弁体(１７)の摺動方向に伸びる弁体出口孔(２４)とで構成している。
弁体入口孔(２３)の入口開口(２５)を弁体(１７)の外周面で開口させ、弁体(１７)の外周面をケース内燃料通路(１５)の下流側通路部分(２１)の内周面に摺動自在に内嵌させ、この下流側通路部分(２１)の上流にこの下流側通路部分(２１)よりも径大の燃料溜め室(２６)を設けている。
感温伸縮性アクチュエータ(１６)の伸縮作動で弁体(１７)の摺動位置を調節することにより、燃料溜め室(２６)に臨む弁体入口孔(２３)の入口開口(２５)の露出面積を変えて、弁体(１７)の弁開度を設定することができるようにしている。
弁体(１７)の外周面とケース内燃料通路(１５)の下流側通路部分(２１)の内周面との間には摺動隙間があり、この摺動隙間から少量の戻し燃料(９)が燃料出口(１９)側にリークし、戻し燃料(９)が常に感温ケース(３６)に沿って流れるようにしている。
他の構造は、図２(Ａ)(Ｂ)に示す基本例と同じにしている。
FIG. 3A shows a first modification of the fuel recirculation valve (10). In this first modification, a valve body internal hole (22) is provided in the valve body (17), and the valve body internal hole ( 22) is a valve body inlet hole (23) along the radial direction of the valve body (17) and a valve body outlet hole (24) extending from the valve body inlet hole (23) in the sliding direction of the valve body (17). It is composed.
The inlet opening (25) of the valve body inlet hole (23) is opened at the outer peripheral surface of the valve body (17), and the outer peripheral surface of the valve body (17) is connected to the downstream side passage portion (21) of the fuel passage (15) in the case. A fuel reservoir chamber (26) having a diameter larger than that of the downstream passage portion (21) is provided upstream of the downstream passage portion (21).
Exposure of the inlet opening (25) of the valve body inlet hole (23) facing the fuel reservoir chamber (26) by adjusting the sliding position of the valve body (17) by the expansion and contraction operation of the temperature-sensitive elastic actuator (16). The valve opening degree of the valve body (17) can be set by changing the area.
There is a sliding gap between the outer peripheral surface of the valve body (17) and the inner peripheral surface of the downstream passage portion (21) of the in-case fuel passage (15), and a small amount of return fuel (9 ) Leaks to the fuel outlet (19) side so that the return fuel (9) always flows along the temperature sensitive case (36).
The other structure is the same as the basic example shown in FIGS.
図３(Ｂ)は燃料還流弁(１０)の第２変形例を示しており、この第２変形例では、感温伸縮性アクチュエータ(１６)は形状記憶バネ(３９)で構成しており、他の構造は、図３(Ａ)に示す第１変形例と同じにしている。
形状記憶バネ(３９)の感温温度が所定値よりも低い場合には、形状記憶バネ(３９)は収縮状態となっており、弁体(１７)は戻しバネ(３８)の付勢力で全開状態に維持される。形状記憶バネ(３９)の感温温度が所定値よりも高くなると、形状記憶バネ(３９)は伸長し、戻しバネ(３８)の付勢力に抗して、弁体(１７)を閉弁側に作動させる。
FIG. 3 (B) shows a second modification of the fuel recirculation valve (10). In this second modification, the temperature-sensitive elastic actuator (16) is composed of a shape memory spring (39), Other structures are the same as those of the first modification shown in FIG.
When the temperature sensitive temperature of the shape memory spring (39) is lower than a predetermined value, the shape memory spring (39) is in a contracted state, and the valve body (17) is fully opened by the urging force of the return spring (38). Maintained in a state. When the temperature sensitive temperature of the shape memory spring (39) becomes higher than a predetermined value, the shape memory spring (39) expands, and the valve element (17) is closed against the biasing force of the return spring (38). To operate.
図４に示す第２実施形態に係るエンジンの燃料供給装置は、機械カム燃料噴射式ディーゼルエンジンの燃料供給装置である。
この第２実施形態では、燃料圧送ポンプ(２)に燃料噴射ポンプ(４０)が用いられ、この燃料噴射ポンプ(４０)から燃料インジェクタ(３)に燃料が圧送される点を除き、第１実施形態と同じ構造が用いられている。
図４中、第１実施形態と同じ要素には、図１と同じ符号を付しておく。
この第２実施形態でも、第１実施形態と同様、図２(Ａ)(Ｂ)に示す燃料還流弁の基本例や図３(Ａ)(Ｂ)に示す燃料還流弁の第１変形例や第２変形例を用いる。
The fuel supply device for an engine according to the second embodiment shown in FIG. 4 is a fuel supply device for a mechanical cam fuel injection type diesel engine.
In the second embodiment, the fuel injection pump (40) is used as the fuel pump (2), and the fuel is pumped from the fuel injection pump (40) to the fuel injector (3). The same structure as the form is used.
In FIG. 4, the same elements as those in the first embodiment are denoted by the same reference numerals as those in FIG.
In the second embodiment, as in the first embodiment, the basic example of the fuel recirculation valve shown in FIGS. 2A and 2B, the first modification of the fuel recirculation valve shown in FIGS. The second modification is used.
(１) エンジン
(２) 燃料圧送ポンプ
(３) 燃料インジェクタ
(４) 燃料タンク
(５) 燃料供給通路
(６) 燃料フィルタ
(７) 燃料戻し通路
(８) 燃料
(９) 戻し燃料
(１０) 燃料還流弁
(１２) 燃料還流通路
(１３) 燃料フィルタケース
(１４) 弁ケース
(１５) ケース内燃料通路
(１６) 感温伸縮性アクチュエータ
(１７) 弁体
(１８) 燃料入口
(１９) 燃料出口
(２０) 上流側通路部分
(２１) 下流側通路部分
(２２) 弁体内部孔
(２３) 弁体入口孔
(２４) 弁体出口孔
(２５) 入口開口
(２６) 燃料溜め室
(４１) 弁座
(４２) 受け座
(４３) 係止部
(４４) 支持スプリング
(４５) 付勢力
(1) Engine
(2) Fuel pump
(3) Fuel injector
(4) Fuel tank
(5) Fuel supply passage
(6) Fuel filter
(7) Fuel return passage
(8) Fuel
(9) Return fuel
(10) Fuel return valve
(12) Fuel return passage
(13) Fuel filter case
(14) Valve case
(15) Fuel passage in the case
(16) Temperature-sensitive elastic actuator
(17) Disc
(18) Fuel inlet
(19) Fuel outlet
(20) Upstream passage section
(21) Downstream passage section
(22) Valve body internal hole
(23) Valve body inlet hole
(24) Valve body outlet hole
(25) Entrance opening
(26) Fuel reservoir chamber
(41) Valve seat
(42) Receiving seat
(43) Locking part
(44) Support spring
(45) Energizing force
Claims (2)
燃料タンク(４)から燃料供給通路(５)を導出し、この燃料供給通路(５)の通路途中に燃料フィルタ(６)を設け、この燃料供給通路(５)の導出端に前記燃料圧送ポンプ(２)を連通させ、燃料タンク(４)内の燃料(８)を燃料フィルタ(６)を介して燃料圧送ポンプ(２)に供給し、
この燃料圧送ポンプ(２)に燃料戻し通路(７)を介して燃料タンク(４)を連通させ、燃料圧送ポンプ(２)の余剰燃料を燃料戻し通路(７)を介して燃料タンク(４)に戻すようにし、
燃料戻し通路(７)の戻し燃料(９)の一部を燃料フィルタ(６)に還流させる感温作動性の燃料還流弁(１０)を設け、この燃料還流弁(１０)の感温温度が所定値よりも低い場合には、この燃料還流弁(１０)を開弁状態に維持して、燃料戻し通路(７)の戻し燃料(９)の一部を燃料タンク(４)に戻すことなく、燃料フィルタ(６)に還流させるようにした、エンジンの燃料供給装置において、
燃料戻し通路(７)から燃料還流通路(１２)を分岐させ、この燃料還流通路(１２)の分岐端を、燃料フィルタ(６)よりも上流で燃料供給通路(５)に連通させ、この燃料還流通路(１２)に前記燃料還流弁(１０)を設け、
この燃料還流弁(１０)を、燃料フィルタ(６)の燃料フィルタケース(１３)とは別体の弁ケース(１４)と、この弁ケース(１４)のケース内燃料通路(１５)に収容された感温伸縮性アクチュエータ(１６)と弁体(１７)とで構成し、
ケース内燃料通路(１５)を通過する戻し燃料(９)の温度を感知した感温伸縮性アクチュエータ(１６)の伸縮作動で弁体(１７)の開閉作動を行わせるようにし、
弁ケース(１４)とケース内燃料通路(１５)とをいずれも真っ直ぐに形成し、
ケース内燃料通路(１５)の上流端に燃料入口(１８)を、ケース内燃料通路(１５)の下流端に燃料出口(１９)を設け、ケース内燃料通路(１５)の上流側通路部分(２０)に感温伸縮性アクチュエータ(１６)を、下流側通路部分(２１)に弁体(１７)をそれぞれ収容し、
ケース内燃料通路(１５)の下流側通路部分(２１)に弁座(４１)を設け、感温伸縮性アクチュエータ(１６)の感温ケース(３６)から出力軸(３７)を突出させ、この出力軸(３７)に弁体(１７)を取り付け、感温ケース(３６)からの出力軸(３７)の突出で弁体(１７)を弁座(４１)に受け止めさせて、燃料還流弁(１０)の閉弁を行うようにし、
ケース内燃料通路(１５)に受け座(４２)を設け、感温ケース(３６)に係止部(４３)を設け、感温ケース(３６)を支持スプリング(４４)で付勢し、この支持スプリング(４４)の付勢力(４５)で係止部(４３)を受け座(４２)に受け止めさせて、ケース内燃料通路(１５)で感温ケース(３６)を支持させることにより、
弁体(１７)を弁座(４１)に受け止めさせた後、更に感温ケース(３６)から出力軸(３７)が突出する場合には、支持スプリング(４４)の付勢力(４５)に抗して、感温ケース(３６)が弁体(１７)から離れるようにした、ことを特徴とするエンジンの燃料供給装置。 A fuel pump (2) is attached to the engine (1), and fuel is pumped to the fuel injector (3) by the fuel pump (2).
A fuel supply passage (5) is led out from the fuel tank (4), a fuel filter (6) is provided in the middle of the fuel supply passage (5), and the fuel pump is provided at the lead-out end of the fuel supply passage (5). (2) is connected, and the fuel (8) in the fuel tank (4) is supplied to the fuel pump (2) through the fuel filter (6).
A fuel tank (4) is communicated with the fuel pump (2) via a fuel return passage (7), and surplus fuel from the fuel pump (2) is passed through the fuel return passage (7) to the fuel tank (4). To return to
A temperature-sensitive operating fuel recirculation valve (10) for recirculating part of the return fuel (9) in the fuel return passage (7) to the fuel filter (6) is provided. If it is lower than the predetermined value, the fuel recirculation valve (10) is maintained in an open state without returning a part of the return fuel (9) in the fuel return passage (7) to the fuel tank (4). In the fuel supply device for the engine, the fuel filter (6) is recirculated.
The fuel return passage (12) is branched from the fuel return passage (7), and the branch end of the fuel return passage (12) is communicated with the fuel supply passage (5) upstream from the fuel filter (6). The fuel return valve (10) is provided in the return passage (12),
This fuel recirculation valve (10) is accommodated in a valve case (14) separate from the fuel filter case (13) of the fuel filter (6) and a fuel passage (15) in the case of the valve case (14). It consists of a temperature-sensitive elastic actuator (16) and a valve body (17),
The opening / closing operation of the valve body (17) is performed by the expansion / contraction operation of the temperature-sensitive elastic actuator (16) that senses the temperature of the return fuel (9) passing through the fuel passage (15) in the case ,
Both the valve case (14) and the fuel passage (15) in the case are formed straight,
A fuel inlet (18) is provided at the upstream end of the in-case fuel passage (15), a fuel outlet (19) is provided at the downstream end of the in-case fuel passage (15), and an upstream side passage portion of the in-case fuel passage (15) ( 20) a temperature-sensitive elastic actuator (16), and a downstream passage portion (21) containing a valve element (17) ,
A valve seat (41) is provided in the downstream passage portion (21) of the fuel passage (15) in the case, and the output shaft (37) is protruded from the temperature sensitive case (36) of the temperature sensitive elastic actuator (16). The valve body (17) is attached to the output shaft (37), and the valve body (17) is received by the valve seat (41) by the projection of the output shaft (37) from the temperature sensing case (36), so that the fuel recirculation valve ( 10) close the valve ,
A receiving seat (42) is provided in the fuel passage (15) in the case, a locking part (43) is provided in the temperature sensitive case (36), and the temperature sensitive case (36) is urged by a support spring (44). The latching portion (43) is received by the seat (42) by the biasing force (45) of the support spring (44), and the temperature sensitive case (36) is supported by the fuel passage (15) in the case,
When the output shaft (37) further protrudes from the temperature sensing case (36) after the valve body (17) is received by the valve seat (41), it resists the urging force (45) of the support spring (44). Then, the fuel supply device for an engine, wherein the temperature sensitive case (36) is separated from the valve body (17).
燃料タンク(４)から燃料供給通路(５)を導出し、この燃料供給通路(５)の通路途中に燃料フィルタ(６)を設け、この燃料供給通路(５)の導出端に前記燃料圧送ポンプ(２)を連通させ、燃料タンク(４)内の燃料(８)を燃料フィルタ(６)を介して燃料圧送ポンプ(２)に供給し、
この燃料圧送ポンプ(２)に燃料戻し通路(７)を介して燃料タンク(４)を連通させ、燃料圧送ポンプ(２)の余剰燃料を燃料戻し通路(７)を介して燃料タンク(４)に戻すようにし、
燃料戻し通路(７)の戻し燃料(９)の一部を燃料フィルタ(６)に還流させる感温作動性の燃料還流弁(１０)を設け、この燃料還流弁(１０)の感温温度が所定値よりも低い場合には、この燃料還流弁(１０)を開弁状態に維持して、燃料戻し通路(７)の戻し燃料(９)の一部を燃料タンク(４)に戻すことなく、燃料フィルタ(６)に還流させるようにした、エンジンの燃料供給装置において、
燃料戻し通路(７)から燃料還流通路(１２)を分岐させ、この燃料還流通路(１２)の分岐端を、燃料フィルタ(６)よりも上流で燃料供給通路(５)に連通させ、この燃料還流通路(１２)に前記燃料還流弁(１０)を設け、
この燃料還流弁(１０)を、燃料フィルタ(６)の燃料フィルタケース(１３)とは別体の弁ケース(１４)と、この弁ケース(１４)のケース内燃料通路(１５)に収容された感温伸縮性アクチュエータ(１６)と弁体(１７)とで構成し、
ケース内燃料通路(１５)を通過する戻し燃料(９)の温度を感知した感温伸縮性アクチュエータ(１６)の伸縮作動で弁体(１７)の開閉作動を行わせるようにし、
弁ケース(１４)とケース内燃料通路(１５)とをいずれも真っ直ぐに形成し、
ケース内燃料通路(１５)の上流端に燃料入口(１８)を、ケース内燃料通路(１５)の下流端に燃料出口(１９)を設け、ケース内燃料通路(１５)の上流側通路部分(２０)に感温伸縮性アクチュエータ(１６)を、下流側通路部分(２１)に弁体(１７)をそれぞれ収容し、
弁体(１７)に弁体内部孔(２２)を設け、弁体内部孔(２２)は弁体(１７)の径方向に沿う弁体入口孔(２３)とこの弁体入口孔(２３)から弁体(１７)の摺動方向に伸びる弁体出口孔(２４)とで構成し、
弁体入口孔(２３)の入口開口(２５)を弁体(１７)の外周面で開口させ、弁体(１７)の外周面をケース内燃料通路(１５)の下流側通路部分(２１)の内周面に摺動自在に内嵌させ、この下流側通路部分(２１)の上流にこの下流側通路部分(２１)よりも径大の燃料溜め室(２６)を設け、
感温伸縮性アクチュエータ(１６)の伸縮作動で弁体(１７)の摺動位置を調節することにより、燃料溜め室(２６)に臨む弁体入口孔(２３)の入口開口(２５)の露出面積を変えて、弁体(１７)の弁開度を設定することができるようにした、ことを特徴するするエンジンの燃料供給装置。 A fuel pump (2) is attached to the engine (1), and fuel is pumped to the fuel injector (3) by the fuel pump (2).
A fuel supply passage (5) is led out from the fuel tank (4), a fuel filter (6) is provided in the middle of the fuel supply passage (5), and the fuel pump is provided at the lead-out end of the fuel supply passage (5). (2) is connected, and the fuel (8) in the fuel tank (4) is supplied to the fuel pump (2) through the fuel filter (6).
A fuel tank (4) is communicated with the fuel pump (2) via a fuel return passage (7), and surplus fuel from the fuel pump (2) is passed through the fuel return passage (7) to the fuel tank (4). To return to
A temperature-sensitive operating fuel recirculation valve (10) for recirculating part of the return fuel (9) in the fuel return passage (7) to the fuel filter (6) is provided. If it is lower than the predetermined value, the fuel recirculation valve (10) is maintained in an open state without returning a part of the return fuel (9) in the fuel return passage (7) to the fuel tank (4). In the fuel supply device for the engine, the fuel filter (6) is recirculated.
The fuel return passage (12) is branched from the fuel return passage (7), and the branch end of the fuel return passage (12) is communicated with the fuel supply passage (5) upstream from the fuel filter (6). The fuel return valve (10) is provided in the return passage (12),
This fuel recirculation valve (10) is accommodated in a valve case (14) separate from the fuel filter case (13) of the fuel filter (6) and a fuel passage (15) in the case of the valve case (14). It consists of a temperature-sensitive elastic actuator (16) and a valve body (17),
The opening / closing operation of the valve body (17) is performed by the expansion / contraction operation of the temperature-sensitive elastic actuator (16) that senses the temperature of the return fuel (9) passing through the fuel passage (15) in the case ,
Both the valve case (14) and the fuel passage (15) in the case are formed straight,
A fuel inlet (18) is provided at the upstream end of the in-case fuel passage (15), a fuel outlet (19) is provided at the downstream end of the in-case fuel passage (15), and an upstream side passage portion of the in-case fuel passage (15) ( 20) a temperature-sensitive elastic actuator (16), and a downstream passage portion (21) containing a valve element (17) ,
A valve body internal hole (22) is provided in the valve body (17), and the valve body internal hole (22) is a valve body inlet hole (23) along the radial direction of the valve body (17) and the valve body inlet hole (23). And a valve body outlet hole (24) extending in the sliding direction of the valve body (17),
The inlet opening (25) of the valve body inlet hole (23) is opened at the outer peripheral surface of the valve body (17), and the outer peripheral surface of the valve body (17) is connected to the downstream side passage portion (21) of the fuel passage (15) in the case. A fuel reservoir chamber 26 having a diameter larger than that of the downstream passage portion 21 is provided upstream of the downstream passage portion 21.
Exposure of the inlet opening (25) of the valve body inlet hole (23) facing the fuel reservoir chamber (26) by adjusting the sliding position of the valve body (17) by the expansion and contraction operation of the temperature-sensitive elastic actuator (16). A fuel supply device for an engine, characterized in that the valve opening degree of the valve body (17) can be set by changing the area.
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| JPH03202672A (en) * | 1989-12-28 | 1991-09-04 | Atsugi Unisia Corp | Fuel filter device for diesel engine |
| DE4031232C2 (en) * | 1990-10-04 | 2000-02-17 | Bosch Gmbh Robert | Fuel supply device for internal combustion engines |
| WO2001038718A1 (en) * | 1999-11-24 | 2001-05-31 | Parker-Hannifin Corporation | Air eliminating return fuel recirculation valve |
| JP4399697B2 (en) * | 2001-02-28 | 2010-01-20 | 株式会社デンソー | Fuel supply device and fuel filtration device |
| JP4328541B2 (en) * | 2003-01-28 | 2009-09-09 | 和興フィルタテクノロジー株式会社 | Fuel filter clog prevention device |
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