WO2013054829A1 - Lifter structure - Google Patents

Lifter structure Download PDF

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Publication number
WO2013054829A1
WO2013054829A1 PCT/JP2012/076281 JP2012076281W WO2013054829A1 WO 2013054829 A1 WO2013054829 A1 WO 2013054829A1 JP 2012076281 W JP2012076281 W JP 2012076281W WO 2013054829 A1 WO2013054829 A1 WO 2013054829A1
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WIPO (PCT)
Prior art keywords
lifter
peripheral surface
bore
outer peripheral
proximity region
Prior art date
Application number
PCT/JP2012/076281
Other languages
French (fr)
Japanese (ja)
Inventor
亜富 荒川
柴田　学
清史 柵木
浩樹 藤井
龍彦 秋田
貴史 渡邊
Original Assignee
株式会社オティックス
トヨタ自動車株式会社
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Application filed by 株式会社オティックス, トヨタ自動車株式会社 filed Critical 株式会社オティックス
Publication of WO2013054829A1 publication Critical patent/WO2013054829A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0426—Arrangements for pressing the pistons against the actuated cam; Arrangements for connecting the pistons to the actuated cam
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0413—Cams
    • 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
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/102—Mechanical drive, e.g. tappets or cams

Definitions

  • the present invention relates to a lifter structure of a fuel pump, for example.
  • the lifter structure described in Patent Document 1 is a lifter structure of a fuel pump that supplies fuel to a fuel injection valve, and includes a cylinder, a plunger, a lifter, and a lifter guide.
  • the cylinder is placed above the lifter guide with a spring seat in between.
  • a guide hole is formed in the cylinder, and a plunger is inserted into the guide hole.
  • a bore is formed in the lifter guide, and a lifter is inserted into the bore. The lower end portion of the plunger contacts the lifter in the bore, and a pump chamber is defined between the upper end portion of the plunger and the cylinder.
  • ⁇ A roller is supported on the lifter, and the roller is in contact with the cam.
  • the lifter is biased toward the cam by a coil spring inserted between the lifter and the spring seat.
  • the plunger is pushed up accordingly, and the volume of the pump chamber is reduced (pressurizing step).
  • the lifter and the plunger are lowered by the biasing force of the coil spring, the volume of the pump chamber is increased (suction step). As the lifter reciprocates in the bore in this way, the volume of the pump chamber is increased or decreased, thereby sucking and discharging fuel.
  • the present invention has been completed based on the above circumstances, and an object thereof is to provide a lifter structure that does not require strict dimensional control.
  • the lifter structure of the present invention has a lifter and a bore into which the lifter is reciprocally inserted, and the distance between the peripheral surfaces is close between the inner peripheral surface of the bore and the outer peripheral surface of the lifter. And a lifter guide that is formed on both sides in the movement direction of the lifter across the proximity region and a separation region in which the distance between the peripheral surfaces is separated from the proximity region. Has characteristics.
  • Either one of the outer peripheral surface of the lifter and the inner peripheral surface of the bore has a curved shape protruding toward the other peripheral surface in the proximity region. Any one of the outer peripheral surface of the lifter and the inner peripheral surface of the bore is prevented from coming into contact with the other peripheral surface.
  • the cross-sectional shape of the inner peripheral surface of the bore is a drum shape having arcuate curves that are line-symmetric with each other.
  • the lifter includes a cylindrical lifter body having the outer peripheral surface, and a roller rotatably accommodated between a pair of opposing walls protruding from an end portion of the lifter body and contacting the cam. As the roller rotates following the rotation, the lifter body reciprocates within the bore within a predetermined stroke range, and is always disposed in the proximity region and the separation region in the stroke range. . This prevents the roller from hitting the cam at the edge.
  • the lifter structure according to the first embodiment includes a lifter 10 that pumps fuel from a fuel pump, and a housing 60 (lifter guide) that guides the reciprocation of the lifter 10.
  • the lifter structure includes a cylinder 50, a plunger 40, a coil spring 30, a retainer 70, and the like.
  • the cylinder 50 has a guide hole 51 extending in the axial direction (the reciprocating movement direction of the lifter 10 and the plunger 40 and in the vertical direction in the drawing).
  • a plunger 40 is inserted into the guide hole 51 of the cylinder 50 so as to be able to reciprocate.
  • the cylinder 50 has a pump chamber 52, and the upper end of the guide hole 51 communicates with the pump chamber 52.
  • the volume of the pump chamber 52 can be increased or decreased by the forward / backward movement of the plunger 40.
  • the housing 60 is disposed below the cylinder 50, and a spring seat 90 is sandwiched between the housing 60 and the cylinder 50.
  • the housing 60 has a bore 61 extending in the axial direction, and the lifter 10 is inserted into the bore 61 so as to reciprocate. Further, the center portion of the cylinder 50 and the spring seat 90 is inserted into the upper end opening of the bore 61 in a fitted state.
  • the shape of the inner peripheral surface of the bore 61 will be described in detail later.
  • the lifter 10 is sandwiched between a bottomed cylindrical lifter body 11, a pair of opposing walls 12 projecting downward from the lower surface of the lifter body 11, and the opposing walls 12. And a pin 14 that passes through both opposing walls 12 and rotatably supports the roller 13.
  • the outer peripheral surface of the lifter body 11 is arranged substantially vertically along the vertical direction, and is slidable on the inner peripheral surface of the bore 61.
  • a cam 80 is disposed below the roller 13, and the outer peripheral surface of the roller 13 is in contact with the outer peripheral surface (cam surface) of the cam 80.
  • the roller 13 is provided on the camshaft 85.
  • a retainer 70 is attached to the lower end portion of the plunger 40, and the lower end of the plunger 40 is in contact with the inner bottom surface of the lifter body 11 together with the retainer 70.
  • a coil spring 30 is inserted between the retainer 70 and the spring seat 90, and the lifter 10 and the plunger 40 are biased toward the cam 80 (lower side in the figure) by the coil spring 30.
  • the roller 13 rolls on the outer peripheral surface of the cam 80, and accordingly, the lifter 10 reciprocates up and down in the bore 61 and the coil spring 30 is moved. Repeat expansion and contraction. Then, in conjunction with the lifter 10, the plunger 40 reciprocates up and down in the guide hole 51, the volume of the pump chamber 52 is increased or decreased, and the fuel is sucked / discharged.
  • a proximity region 65 that brings the distance between the inner peripheral surface of the bore 61 and the outer peripheral surface of the lifter 10 close to each other, and the inner peripheral surface of the bore 61.
  • a separation region 66 that separates the distance from the outer peripheral surface of the lifter 10 from the proximity region 65 is formed.
  • the separation regions 66 are arranged in pairs on both sides in the vertical direction across the proximity region 65.
  • the inner peripheral surface of the bore 61 of the housing 60 protrudes in a direction in which the gap with the outer peripheral surface of the lifter 10 is reduced in the proximity region 65, while the gap with the outer peripheral surface of the lifter 10 is expanded in the separation region 66. It has a curved surface portion 67 that retracts.
  • the curved surface portion 67 is partitioned by an arcuate curve that forms a pair on both sides of the axis of the bore 61.
  • the cross-sectional shape of the inner peripheral surface of the bore 61 is configured as a drum shape having arcuate curves that are symmetrical with respect to each other.
  • the lifter 10 is set so as to be always disposed in the proximity / separation regions 65 and 66 in the operation range (the stroke range between the upper and lower dead centers).
  • the movement posture of the lifter 10 relative to the housing 60 is maintained in a normal posture.
  • the clearance between the outer peripheral surface of the lifter 10 and the inner peripheral surface of the bore 61 is minimized, so that the lifter 10 is prevented from being exposed, and the reciprocating operation of the lifter 10 is prevented. Stability is ensured.
  • the proximity region 65 and the separation region 66 are formed in the bore 61 of the housing 60, even if misalignment occurs, the necessary clearance is minimum in the proximity region 65. The stability of the movement operation of the lifter 10 is ensured. Further, since the proximity region 65 and the separation region 66 are formed in the bore 61 of the housing 60, the clearance between the peripheral surfaces of the inner peripheral surface of the bore 61 and the outer peripheral surface of the lifter 10 is increased to a full height as in the conventional case. It is not necessary to make it constant over the gap, and the gap management between the housing 60 and the lifter 10 becomes easy. As a result, a lifter structure that does not require strict dimensional control is provided.
  • the curved surface portion 67 protruding toward the outer peripheral surface side of the lifter 10 is formed in the proximity region 65 on the inner peripheral surface of the bore 61, the inner peripheral surface of the bore 61 contacts the outer peripheral surface of the lifter 10 with an edge. To be prevented.
  • the cross-sectional shape of the inner peripheral surface of the bore 61 is a drum shape having a line-symmetrical arcuate curve, the lifter 10 has the drum shape of the bore 61 even if the axis of the bore 61 is displaced due to misalignment. By displacing along the line, a larger misalignment allowance can be secured.
  • a configuration in which a curved surface portion is formed on the outer peripheral surface of the lifter may be employed.
  • bore and the outer peripheral surface of a lifter may be sufficient.
  • the present invention is not limited to the lifter structure of the fuel pump, and can be widely applied to a general valve train mechanism.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Reciprocating Pumps (AREA)

Abstract

Provided is a lifter structure which does not require strict dimension control. The lifter structure is provided with a lifter (10) and a housing (60) for guiding the lifter (10). The housing (60) comprises a bore (61) into which the lifter (10) can be inserted so as to be able to move backwards and forwards. Between the inner circumferential surface of the bore (61) of the housing (60) and the outer circumferential surface of the lifter (10) are formed a neighbouring region (65), in which the distance between both circumferential surfaces is adjacent, and separated regions (66), in which the distance between both circumferential surfaces in the direction of movement on both sides of the lifter (10) sandwiching the neighbouring region (65) is further apart than the neighbouring region (65).

Description

リフタ構造Lifter structure
　本発明は、例えば、燃料ポンプのリフタ構造に関する。 The present invention relates to a lifter structure of a fuel pump, for example.
　特許文献１に記載のリフタ構造は、燃料噴射弁に燃料を供給する燃料ポンプのリフタ構造であって、シリンダ、プランジャ、リフタ、及びリフタガイドを備えている。 The lifter structure described in Patent Document 1 is a lifter structure of a fuel pump that supplies fuel to a fuel injection valve, and includes a cylinder, a plunger, a lifter, and a lifter guide.
　シリンダはリフタガイドの上方にスプリングシートを挟んで配置されている。シリンダにはガイド孔が形成され、ガイド孔にはプランジャが挿入されている。また、リフタガイドにはボアが形成され、ボアにはリフタが挿入されている。プランジャの下端部はボア内でリフタに当接し、プランジャの上端部とシリンダとの間にはポンプ室が区画されている。 ¡The cylinder is placed above the lifter guide with a spring seat in between. A guide hole is formed in the cylinder, and a plunger is inserted into the guide hole. Further, a bore is formed in the lifter guide, and a lifter is inserted into the bore. The lower end portion of the plunger contacts the lifter in the bore, and a pump chamber is defined between the upper end portion of the plunger and the cylinder.
　リフタにはローラが軸支され、ローラはカムと当接している。そして、リフタは、スプリングシートとの間に介挿されたコイルスプリングによってカム側に付勢されている。カムの駆動に伴ってローラが回転し、リフタが押し上げられると、それに伴いプランジャも押し上げられて、ポンプ室の容積が減少させられる（加圧工程）。一方、コイルスプリングの付勢力によってリフタ及びプランジャが下降すると、ポンプ室の容積が増加させられる（吸引工程）。こうしてリフタがボア内を往復移動することにより、ポンプ室の容積が増減させられ、これによって燃料の吸引・吐出が行われるようになっている。 ¡A roller is supported on the lifter, and the roller is in contact with the cam. The lifter is biased toward the cam by a coil spring inserted between the lifter and the spring seat. When the roller rotates as the cam is driven and the lifter is pushed up, the plunger is pushed up accordingly, and the volume of the pump chamber is reduced (pressurizing step). On the other hand, when the lifter and the plunger are lowered by the biasing force of the coil spring, the volume of the pump chamber is increased (suction step). As the lifter reciprocates in the bore in this way, the volume of the pump chamber is increased or decreased, thereby sucking and discharging fuel.
特開２００９－２３６０４１号公報JP 2009-26041 A
　ところで、仮に、カムとローラとの間にミスアライメントが生じていると、ローラがカムにエッジ当りして異常摩耗が発生する懸念がある。これに鑑み、例えば、リフタガイドのボアの内周面とリフタの外周面との間のクリアランスを拡げてミスアライメントを吸収できるような構造にすると、実動時にリフタが暴れて（ぶれて）ボアの内周面を叩き、打音・異音を発生させる懸念がある。こうしたことから従来においては、各部品の寸法公差を厳密に管理しなければならず、コストが上昇する一因になっている。 By the way, if misalignment occurs between the cam and the roller, there is a concern that the roller hits the edge of the cam and abnormal wear occurs. In view of this, for example, if the structure between the inner peripheral surface of the lifter guide bore and the outer peripheral surface of the lifter is widened to absorb the misalignment, the lifter is exposed to the bore during the actual operation. There is a concern of hitting the inner peripheral surface of the door and generating sound and noise. For these reasons, conventionally, the dimensional tolerance of each part must be strictly controlled, which is one of the causes of increased costs.
　本発明は上記のような事情に基づいて完成されたものであって、厳密な寸法管理を必要としないリフタ構造を提供することを目的とする。 The present invention has been completed based on the above circumstances, and an object thereof is to provide a lifter structure that does not require strict dimensional control.
　本発明のリフタ構造は、リフタと、前記リフタが往復移動可能に挿入されるボアを有し、前記ボアの内周面と前記リフタの外周面との間に、両周面間の距離が近接する近接領域とこの近接領域を挟んだ前記リフタの移動方向両側にあって両周面間の距離が前記近接領域よりも離間する離間領域とが形成されているリフタガイドとを備えているところに特徴を有する。 The lifter structure of the present invention has a lifter and a bore into which the lifter is reciprocally inserted, and the distance between the peripheral surfaces is close between the inner peripheral surface of the bore and the outer peripheral surface of the lifter. And a lifter guide that is formed on both sides in the movement direction of the lifter across the proximity region and a separation region in which the distance between the peripheral surfaces is separated from the proximity region. Has characteristics.
　ボアの内周面とリフタの外周面との間には両周面間の距離が近接する近接領域とこの近接領域を挟んだリフタの移動方向両側にあって両周面間の距離が近接領域よりも離間する離間領域とが形成されているため、ミスアライメントによってボアの軸心がずれても、近接領域でボアの内周面とリフタの外周面との間に必要なクリアランスが最小限に設定され得る。その結果、ボア内でリフタが暴れるのが防止され、リフタの移動動作の安定性が確保される。 Between the inner peripheral surface of the bore and the outer peripheral surface of the lifter, there is a proximity region where the distance between both peripheral surfaces is close, and the distance between both peripheral surfaces is on both sides in the movement direction of the lifter across this proximity region The gap between the bore and the lifter's outer surface is minimized in the proximity region even if the bore's axis is displaced due to misalignment. Can be set. As a result, the lifter is prevented from being exposed in the bore, and the stability of the lifter moving operation is ensured.
　この場合、ボアの内周面とリフタの外周面の両周面全体が互いに平行に配置される従来の場合と違って、両周面間の寸法管理を厳密に行う必要がない。したがって、厳密な寸法管理を要せずとも、ボアの内周面とリフタの外周面との間の必要なクリアランスを確保することができ、ミスアライメントの許容量を大きく確保することができる。 In this case, unlike the conventional case in which the entire inner peripheral surface of the bore and the entire outer peripheral surface of the lifter are arranged in parallel to each other, it is not necessary to strictly manage the dimensions between the peripheral surfaces. Therefore, the required clearance between the inner peripheral surface of the bore and the outer peripheral surface of the lifter can be secured without requiring strict dimensional management, and a large misalignment allowance can be secured.
本発明の実施例１に係るリフタ構造の要部拡大図である。It is a principal part enlarged view of the lifter structure which concerns on Example 1 of this invention. ミスアライメントが生じた場合のリフタ構造の要部拡大図である。It is a principal part enlarged view of the lifter structure when misalignment arises. リフタ構造の断面図である。It is sectional drawing of a lifter structure.
　本発明の好ましい形態を以下に示す。
　前記リフタの外周面と前記ボアの内周面のいずれか一方の周面が前記近接領域において他方の周面に向けて突出する曲面状の形態とされている。リフタの外周面とボアの内周面のいずれか一方の周面が他方の周面にエッジ当りするのが阻止される。 Preferred embodiments of the present invention are shown below.
Either one of the outer peripheral surface of the lifter and the inner peripheral surface of the bore has a curved shape protruding toward the other peripheral surface in the proximity region. Any one of the outer peripheral surface of the lifter and the inner peripheral surface of the bore is prevented from coming into contact with the other peripheral surface.
　前記ボアの内周面の断面形状が、互いに線対称の円弧状曲線を有する鼓形状とされている。これにより、ミスアライメントによってボアの軸心がずれても、リフタがボアの鼓形状に沿って変位するため、ミスアライメントの許容量をより大きく確保することができる。 The cross-sectional shape of the inner peripheral surface of the bore is a drum shape having arcuate curves that are line-symmetric with each other. Thereby, even if the axial center of the bore is displaced due to misalignment, the lifter is displaced along the drum shape of the bore, so that a larger misalignment allowance can be secured.
　前記リフタは、前記外周面を有する筒状のリフタ本体と、前記リフタ本体の端部から突出する一対の対向壁間に回転可能に収容されてカムに当接するローラとを有し、前記カムの回転に伴って前記ローラが従動回転することにより、前記リフタ本体が前記ボア内を所定のストローク範囲で往復移動するものであり、そのストローク範囲では常に前記近接領域及び前記離間領域に配置されている。これにより、ローラがカムにエッジ当りするのが阻止される。 The lifter includes a cylindrical lifter body having the outer peripheral surface, and a roller rotatably accommodated between a pair of opposing walls protruding from an end portion of the lifter body and contacting the cam. As the roller rotates following the rotation, the lifter body reciprocates within the bore within a predetermined stroke range, and is always disposed in the proximity region and the separation region in the stroke range. . This prevents the roller from hitting the cam at the edge.
　＜実施例１＞
　本発明の実施例１を図１～図３によって説明する。実施例１に係るリフタ構造は、燃料ポンプの燃料を圧送するリフタ１０と、リフタ１０の往復動作をガイドするハウジング６０（リフタガイド）とを備えている。また、リフタ構造は、上記に加え、シリンダ５０、プランジャ４０、コイルスプリング３０、リテーナ７０等を備えて構成されている。 <Example 1>
A first embodiment of the present invention will be described with reference to FIGS. The lifter structure according to the first embodiment includes a lifter 10 that pumps fuel from a fuel pump, and a housing 60 (lifter guide) that guides the reciprocation of the lifter 10. In addition to the above, the lifter structure includes a cylinder 50, a plunger 40, a coil spring 30, a retainer 70, and the like.
　図３に示すように、シリンダ５０は、軸方向（リフタ１０及びプランジャ４０の往復移動方向であって図示上下方向）に延びるガイド孔５１を有している。シリンダ５０のガイド孔５１にはプランジャ４０が往復移動可能に挿入されている。また、シリンダ５０はポンプ室５２を有し、このポンプ室５２にガイド孔５１の上端が連通している。ポンプ室５２の容積は、プランジャ４０の進退動作によって増減させられるようになっている。 As shown in FIG. 3, the cylinder 50 has a guide hole 51 extending in the axial direction (the reciprocating movement direction of the lifter 10 and the plunger 40 and in the vertical direction in the drawing). A plunger 40 is inserted into the guide hole 51 of the cylinder 50 so as to be able to reciprocate. The cylinder 50 has a pump chamber 52, and the upper end of the guide hole 51 communicates with the pump chamber 52. The volume of the pump chamber 52 can be increased or decreased by the forward / backward movement of the plunger 40.
　ハウジング６０は、シリンダ５０の下方に配置され、シリンダ５０との間にはスプリングシート９０が挟着されている。そして、ハウジング６０は軸方向に延びるボア６１を有し、ボア６１にはリフタ１０が往復移動可能に挿入されている。また、ボア６１の上端開口部にはシリンダ５０及びスプリングシート９０の中心部が嵌合状態で挿入されている。なお、ボア６１の内周面の形状については後に詳述する。 The housing 60 is disposed below the cylinder 50, and a spring seat 90 is sandwiched between the housing 60 and the cylinder 50. The housing 60 has a bore 61 extending in the axial direction, and the lifter 10 is inserted into the bore 61 so as to reciprocate. Further, the center portion of the cylinder 50 and the spring seat 90 is inserted into the upper end opening of the bore 61 in a fitted state. The shape of the inner peripheral surface of the bore 61 will be described in detail later.
　リフタ１０は、図１及び図３に示すように、有底筒状のリフタ本体１１と、リフタ本体１１の下面から下方に突出する一対の対向壁１２と、両対向壁１２間に挟まれるように収容されるローラ１３と、両対向壁１２を貫通してローラ１３を回転可能に支持するピン１４とを有している。リフタ本体１１の外周面は、上下方向に沿ってほぼ垂直に配置され、ボア６１の内周面に摺動可能とされている。ローラ１３の下方にはカム８０が配置され、ローラ１３の外周面はカム８０の外周面（カム面）に当接している。ローラ１３はカムシャフト８５に設けられている。 As shown in FIGS. 1 and 3, the lifter 10 is sandwiched between a bottomed cylindrical lifter body 11, a pair of opposing walls 12 projecting downward from the lower surface of the lifter body 11, and the opposing walls 12. And a pin 14 that passes through both opposing walls 12 and rotatably supports the roller 13. The outer peripheral surface of the lifter body 11 is arranged substantially vertically along the vertical direction, and is slidable on the inner peripheral surface of the bore 61. A cam 80 is disposed below the roller 13, and the outer peripheral surface of the roller 13 is in contact with the outer peripheral surface (cam surface) of the cam 80. The roller 13 is provided on the camshaft 85.
　図３に示すように、プランジャ４０の下端部にはリテーナ７０が装着され、プランジャ４０の下端は、リテーナ７０とともにリフタ本体１１の内底面に当接している。リテーナ７０とスプリングシート９０との間にはコイルスプリング３０が介挿され、リフタ１０とプランジャ４０はコイルスプリング３０によってカム８０側（図示下側）に付勢されている。 As shown in FIG. 3, a retainer 70 is attached to the lower end portion of the plunger 40, and the lower end of the plunger 40 is in contact with the inner bottom surface of the lifter body 11 together with the retainer 70. A coil spring 30 is inserted between the retainer 70 and the spring seat 90, and the lifter 10 and the plunger 40 are biased toward the cam 80 (lower side in the figure) by the coil spring 30.
　ここで、エンジンによりカムシャフト８５とカム８０が回転すると、カム８０の外周面をローラ１３が転動し、それに伴ってリフタ１０がボア６１内を上下方向に往復動するとともに、コイルスプリング３０が伸縮動作を繰り返す。そして、リフタ１０に連動してプランジャ４０がガイド孔５１内を上下方向に往復動して、ポンプ室５２の容積が増減させられ、もって燃料の吸引・吐出が行われる。 Here, when the camshaft 85 and the cam 80 are rotated by the engine, the roller 13 rolls on the outer peripheral surface of the cam 80, and accordingly, the lifter 10 reciprocates up and down in the bore 61 and the coil spring 30 is moved. Repeat expansion and contraction. Then, in conjunction with the lifter 10, the plunger 40 reciprocates up and down in the guide hole 51, the volume of the pump chamber 52 is increased or decreased, and the fuel is sucked / discharged.
　さて、図１に示すように、ハウジング６０のボア６１内には、ボア６１の内周面とリフタ１０の外周面との間の距離を近接させる近接領域６５と、ボア６１の内周面とリフタ１０の外周面との間の距離を近接領域６５よりも離間させる離間領域６６とが形成されている。離間領域６６は、近接領域６５を挟んだ上下方向両側に対をなして配置されている。 As shown in FIG. 1, in the bore 61 of the housing 60, there are a proximity region 65 that brings the distance between the inner peripheral surface of the bore 61 and the outer peripheral surface of the lifter 10 close to each other, and the inner peripheral surface of the bore 61. A separation region 66 that separates the distance from the outer peripheral surface of the lifter 10 from the proximity region 65 is formed. The separation regions 66 are arranged in pairs on both sides in the vertical direction across the proximity region 65.
　また、ハウジング６０のボア６１の内周面には、近接領域６５においてリフタ１０の外周面との隙間を縮める方向に突出する一方、離間領域６６においてリフタ１０の外周面との隙間を拡げる方向に退避する曲面部６７を有している。曲面部６７は、ボア６１の軸心を挟んだ両側で対をなす円弧状曲線によって区画されている。このため、ボア６１の内周面の断面形状は、互いに線対称の円弧状曲線を有する鼓形状に構成されている。なお、リフタ１０は、その動作範囲（上下死点間のストローク範囲）では常に近接・離間領域６５、６６内に配置されるように設定されている。 Further, the inner peripheral surface of the bore 61 of the housing 60 protrudes in a direction in which the gap with the outer peripheral surface of the lifter 10 is reduced in the proximity region 65, while the gap with the outer peripheral surface of the lifter 10 is expanded in the separation region 66. It has a curved surface portion 67 that retracts. The curved surface portion 67 is partitioned by an arcuate curve that forms a pair on both sides of the axis of the bore 61. For this reason, the cross-sectional shape of the inner peripheral surface of the bore 61 is configured as a drum shape having arcuate curves that are symmetrical with respect to each other. The lifter 10 is set so as to be always disposed in the proximity / separation regions 65 and 66 in the operation range (the stroke range between the upper and lower dead centers).
　図１に示すように、ハウジング６０等が正しく組み付けられ、ボア６１の軸心が正しい方向に向けられている場合には、ハウジング６０に対するリフタ１０の移動姿勢が正規姿勢に保たれる。この場合、近接領域６５ではリフタ１０の外周面とボア６１の内周面との間のクリアランスが最小限になっていることにより、リフタ１０が暴れるのが防止され、リフタ１０の往復移動動作の安定性が確保される。 As shown in FIG. 1, when the housing 60 and the like are correctly assembled and the axis of the bore 61 is oriented in the correct direction, the movement posture of the lifter 10 relative to the housing 60 is maintained in a normal posture. In this case, in the proximity region 65, the clearance between the outer peripheral surface of the lifter 10 and the inner peripheral surface of the bore 61 is minimized, so that the lifter 10 is prevented from being exposed, and the reciprocating operation of the lifter 10 is prevented. Stability is ensured.
　一方、図２に示すように、ミスアライメントによってボア６１の軸心が正規方向に対して傾斜する方向にずれている場合でも、上記同様、近接領域６５ではリフタ１０の外周面とボア６１の内周面との間のクリアランスが最小限になっていることにより、リフタ１０の往復移動動作の安定性が確保される。なお、ボア６１の内周面には線対称の曲面部６７が形成されているため、ボア６１の軸心のずれが左右いずれの方向に傾斜していても、上記同様の効果を得ることができる。 On the other hand, as shown in FIG. 2, even when the axis of the bore 61 is displaced in a direction inclined with respect to the normal direction due to misalignment, in the proximity region 65, the outer surface of the lifter 10 and the inside of the bore 61 are the same as above. Since the clearance with the peripheral surface is minimized, the stability of the reciprocating movement of the lifter 10 is ensured. In addition, since the axisymmetric curved surface portion 67 is formed on the inner peripheral surface of the bore 61, the same effect as described above can be obtained even if the axial misalignment of the bore 61 is inclined in the left or right direction. it can.
　以上説明したように、実施例１によれば、ハウジング６０のボア６１内に近接領域６５と離間領域６６とが形成されているため、ミスアライメントが生じても、近接領域６５で必要クリアランスが最小限に確保されてリフタ１０の移動動作の安定性が確保される。また、ハウジング６０のボア６１内に近接領域６５と離間領域６６が形成されているため、従来のように、ボア６１の内周面とリフタ１０の外周面の両周面間のクリアランスを全高に亘って一定にする必要がなく、ハウジング６０とリフタ１０との間のギャップ管理が容易になる。その結果、厳密な寸法管理を必要としないリフタ構造が提供される。 As described above, according to the first embodiment, since the proximity region 65 and the separation region 66 are formed in the bore 61 of the housing 60, even if misalignment occurs, the necessary clearance is minimum in the proximity region 65. The stability of the movement operation of the lifter 10 is ensured. Further, since the proximity region 65 and the separation region 66 are formed in the bore 61 of the housing 60, the clearance between the peripheral surfaces of the inner peripheral surface of the bore 61 and the outer peripheral surface of the lifter 10 is increased to a full height as in the conventional case. It is not necessary to make it constant over the gap, and the gap management between the housing 60 and the lifter 10 becomes easy. As a result, a lifter structure that does not require strict dimensional control is provided.
　また、ボア６１の内周面には近接領域６５においてリフタ１０の外周面側に向けて突出する曲面部６７が形成されているため、ボア６１の内周面がリフタ１０の外周面にエッジ当りするのが阻止される。さらに、ボア６１の内周面の断面形状が互いに線対称の円弧状曲線を有する鼓形状とされているため、ミスアライメントによってボア６１の軸心がずれても、リフタ１０がボア６１の鼓形状に沿って変位することにより、ミスアライメントの許容量をより大きく確保することができる。 Further, since the curved surface portion 67 protruding toward the outer peripheral surface side of the lifter 10 is formed in the proximity region 65 on the inner peripheral surface of the bore 61, the inner peripheral surface of the bore 61 contacts the outer peripheral surface of the lifter 10 with an edge. To be prevented. Further, since the cross-sectional shape of the inner peripheral surface of the bore 61 is a drum shape having a line-symmetrical arcuate curve, the lifter 10 has the drum shape of the bore 61 even if the axis of the bore 61 is displaced due to misalignment. By displacing along the line, a larger misalignment allowance can be secured.
　なお、本発明によれば、実施例１とは逆に、リフタの外周面に曲面部が形成される構成であってもよい。あるいは、ボアの内周面とリフタの外周面のいずれにも曲面部が形成される構成であってもよい。
　また、本発明は、燃料ポンプのリフタ構造に限定されず、一般的な動弁系の機構に広く適用することが可能である。 Note that, according to the present invention, contrary to the first embodiment, a configuration in which a curved surface portion is formed on the outer peripheral surface of the lifter may be employed. Or the structure by which a curved-surface part is formed in both the inner peripheral surface of a bore | bore and the outer peripheral surface of a lifter may be sufficient.
Further, the present invention is not limited to the lifter structure of the fuel pump, and can be widely applied to a general valve train mechanism.
　１０…リフタ
　１３…ローラ
　６０…ハウジング（リフタガイド）
　６１…ボア
　６５…近接領域
　６６…離間領域
　６７…曲面部
　８０…カム 10 ... Lifter 13 ... Roller 60 ... Housing (lifter guide)
61 ... Bore 65 ... Proximity region 66 ... Separation region 67 ... Curved surface portion 80 ... Cam

Claims (4)

  1. 　リフタと、
    　前記リフタが往復移動可能に挿入されるボアを有し、前記ボアの内周面と前記リフタの外周面との間に、両周面間の距離が近接する近接領域とこの近接領域を挟んだ前記リフタの移動方向両側にあって両周面間の距離が前記近接領域よりも離間する離間領域とが形成されているリフタガイドとを備えていることを特徴とするリフタ構造。     Lifter,
    The lifter has a bore into which the lifter can be reciprocally moved, and the proximity region where the distance between the peripheral surfaces is close to the inner peripheral surface of the bore and the outer peripheral surface of the lifter is sandwiched between the proximity region A lifter structure comprising: a lifter guide formed on both sides in the movement direction of the lifter and having a separation region in which a distance between both peripheral surfaces is separated from the proximity region.
  2. 　前記リフタの外周面と前記ボアの内周面のいずれか一方の周面が前記近接領域において他方の周面に向けて突出する曲面状の形態とされていることを特徴とする請求項１記載のリフタ構造。 The peripheral surface of one of the outer peripheral surface of the lifter and the inner peripheral surface of the bore is formed in a curved shape projecting toward the other peripheral surface in the proximity region. Lifter structure.
  3. 　前記ボアの内周面の断面形状が、互いに線対称の円弧状曲線を有する鼓形状とされていることを特徴とする請求項２記載のリフタ構造。 3. The lifter structure according to claim 2, wherein a cross-sectional shape of an inner peripheral surface of the bore is a drum shape having arcuate curves that are line-symmetric with each other.
  4. 　前記リフタは、前記外周面を有する筒状のリフタ本体と、前記リフタ本体の端部から突出する一対の対向壁間に回転可能に収容されてカムに当接するローラとを有し、前記カムの回転に伴って前記ローラが従動回転することにより、前記リフタ本体が前記ボア内を所定のストローク範囲で往復移動するものであり、そのストローク範囲では常に前記近接領域及び前記離間領域に配置されていることを特徴とする請求項１ないし３のいずれか１項記載のリフタ構造。 The lifter includes a cylindrical lifter body having the outer peripheral surface, and a roller rotatably accommodated between a pair of opposing walls protruding from an end portion of the lifter body and contacting the cam. As the roller rotates following the rotation, the lifter body reciprocates within the bore within a predetermined stroke range, and is always disposed in the proximity region and the separation region in the stroke range. The lifter structure according to any one of claims 1 to 3, wherein
PCT/JP2012/076281 2011-10-14 2012-10-11 Lifter structure WO2013054829A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56124208U (en) * 1980-02-23 1981-09-21
JP2000145572A (en) * 1998-09-10 2000-05-26 Denso Corp Fuel injection pump
JP2002031017A (en) * 2000-07-14 2002-01-31 Toyota Motor Corp High-pressure pump
JP2009257451A (en) * 2008-04-16 2009-11-05 Toyota Motor Corp Structure of roller lifter

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08219009A (en) * 1995-02-14 1996-08-27 Toyota Motor Corp Plunger pump
JP2001132620A (en) * 1999-11-09 2001-05-18 Jun Iijima Pump
JP2004092517A (en) * 2002-08-30 2004-03-25 Toshiba Kyaria Kk Fluid machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56124208U (en) * 1980-02-23 1981-09-21
JP2000145572A (en) * 1998-09-10 2000-05-26 Denso Corp Fuel injection pump
JP2002031017A (en) * 2000-07-14 2002-01-31 Toyota Motor Corp High-pressure pump
JP2009257451A (en) * 2008-04-16 2009-11-05 Toyota Motor Corp Structure of roller lifter

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