WO2013098883A1 - 駆動装置 - Google Patents

駆動装置 Download PDF

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Publication number
WO2013098883A1
WO2013098883A1 PCT/JP2011/007304 JP2011007304W WO2013098883A1 WO 2013098883 A1 WO2013098883 A1 WO 2013098883A1 JP 2011007304 W JP2011007304 W JP 2011007304W WO 2013098883 A1 WO2013098883 A1 WO 2013098883A1
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WO
WIPO (PCT)
Prior art keywords
rocker arm
end portion
drive cam
rocking
urging
Prior art date
Application number
PCT/JP2011/007304
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
臼井　隆
Original Assignee
トヨタ自動車株式会社
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 トヨタ自動車株式会社 filed Critical トヨタ自動車株式会社
Priority to CN201180075901.1A priority Critical patent/CN104053867B/zh
Priority to PCT/JP2011/007304 priority patent/WO2013098883A1/ja
Priority to JP2013551030A priority patent/JP5867515B2/ja
Priority to DE112011106042.4T priority patent/DE112011106042B4/de
Publication of WO2013098883A1 publication Critical patent/WO2013098883A1/ja

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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
    • F02M59/02—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
    • 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
    • F02M59/04—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 special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps
    • F02M59/06—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 special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps with cylinders arranged radially to driving shaft, e.g. in V or star arrangement
    • 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
    • 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
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • F02M59/367—Pump inlet valves of the check valve type being open when actuated

Definitions

  • the present invention relates to a drive device that reciprocates a driven member by a rocker arm, and more particularly to a drive device suitable for driving a high-pressure fuel pump that pressurizes fuel of an internal combustion engine to a high pressure capable of in-cylinder injection.
  • the drive device provided with the rocker arm can reciprocate the driven member engaged with the rocker arm by swinging the rocker arm according to the rotation input.
  • a drive device is widely used in a valve mechanism of an internal combustion engine, but is also applied to other devices, for example, a drive device of a high-pressure fuel pump that pressurizes the fuel of an internal combustion engine to a high pressure by reciprocating a plunger it can.
  • a rocker arm supporting portion that restricts the rocker arm from falling off is provided integrally with the head cover (see, for example, Patent Document 1).
  • the cam follower is supported by a support shaft penetrating in the direction of the central axis of the cam follower so that the cam follower can be prevented from falling off the plunger even when the plunger for driving the unit injector is stuck, and the lifting direction by the tension spring
  • Patent Document 2 There is also known one that is biased to (see, for example, Patent Document 2).
  • JP 2007-192101 A Japanese Utility Model Publication No. 05-21163
  • the rocker arm support portion that is close to the rocking fulcrum portion of the rocker arm with a small gap the rocker arm can be prevented from falling off, but is driven by the rocker arm.
  • the rocker arm When the push rod, the valve stem, or the like raises a stick, the rocker arm is not normally supported, and there is a concern that the peripheral parts may be damaged by hitting from the drive cam.
  • the present invention provides a drive device that can suppress damage to the parts around the rocker arm even if some abnormality occurs on the driven member side, and that can improve the assembly and durability of the driven member. It is to provide.
  • the fuel pump according to the present invention is (1) a drive cam, a rocker arm that swings according to the rotation of the drive cam, and the rocker arm that rocks in cooperation with the drive cam.
  • a rocker arm support mechanism that is movably supported, and a driven member that urges the rocking end of the rocker arm in a direction approaching the drive cam is reciprocated in the rocking direction of the rocker arm.
  • the rocker arm support mechanism includes a pivot member that swingably supports a base end portion of the rocker arm, a support member to which the pivot member is fixed, and the swing end of the rocker arm. And a biasing member that is supported by the support member on the portion side and biases the swing end portion to one side in the swing direction.
  • the rocking end of the rocker arm is supported by the support member on the rocking end side. It is urged to one side in the swinging direction by the urging member. Therefore, even if some abnormality occurs on the driven member side and the urging force from the driven member side to the rocker arm is reduced, the rocker arm is provided with the pivot member and the urging member of the rocker arm support mechanism, and the urging member. Thus, the rocking end of the rocker arm is supported at three points by the driving cam or the driven member.
  • the one side in the swinging direction may be a direction in which the swinging end of the rocker arm is separated from the driving cam.
  • the driven member urges the rocking end of the rocker arm toward the driving cam with a first urging force
  • the urging member includes the rocker. It is preferable that the swinging end portion of the arm is biased with a second biasing force smaller than the first biasing force.
  • the rocker arm when the urging force from the driven member is normal, the rocker arm can be reliably swung in accordance with the urging force from the driven member side and the rotation of the drive cam.
  • the rocker arm When the urging force from the head is abnormally reduced, the rocker arm is urged to the driven member side or the driving cam side by the urging member, thereby preventing the rocker arm from being unstable.
  • the one side in the swing direction may be a direction in which the swing end of the rocker arm approaches the drive cam.
  • the urging member suppresses displacement of the swing end portion of the rocker arm in a direction orthogonal to the swing direction according to the rotation of the drive cam. It is desirable. Accordingly, before the driven member is assembled, the rocker arm can be positioned in a fixed posture, that is, at a specific position in the swinging direction and the turning direction orthogonal thereto, and is engaged with the swinging end of the rocker arm. Assembly of the driven member can be facilitated.
  • the urging member is engaged with the support end supported by the support member and the swing end of the rocker arm from the other side in the swing direction. It is preferable to have an intermediate elastic body portion interposed between the support end portion and the engagement end portion while having a joint end portion. Accordingly, the biasing member can be easily disposed within the installation range of the rocker arm in the reciprocating direction of the driven member, and the rocker arm can be supported by the support member in a fixed posture even before the engagement of the drive cam and the rocker arm. Can do.
  • At least the intermediate elastic body portion among the support end portion, the engagement end portion, and the intermediate elastic body portion of the biasing member is a leaf spring. It is preferable to be configured. In this case, even if the length of the leaf spring constituting the intermediate elastic body portion is relatively large, it can be easily arranged, and a biasing member having a low spring constant and high durability can be realized.
  • the supporting end portion and the engaging end portion of the biasing member are relatively displaceable in the direction of the reciprocating motion of the driven member.
  • the intermediate elastic body portion is formed of an elastic component that is contracted between the support end portion and the engagement end portion. In this case, the rocking range of the rocker arm can be clearly defined even before the drive cam and the rocker arm are engaged.
  • the driven member is constituted by the input member of the pump device that sucks and discharges fluid into the pump body by reciprocating movement of the input member, and the pump device is It is preferable to have an elastic member that urges the member toward the side approaching the drive cam.
  • the input member of the pump device can be reciprocated according to the rocker arm swinging according to the rotation of the drive cam, and the drive device is suitable for a high-pressure pump. If the input member of the pump device cannot normally reciprocate due to some abnormality and the urging force from the input member that urges the rocker arm toward the drive cam is greatly reduced or lost, the rocker arm is moved to the rocker arm.
  • the support mechanism and the drive cam By supporting the three points by the support mechanism and the drive cam, it is possible to avoid damage to the peripheral parts due to the rocking of the rocker arm by avoiding the impact of the rocker arm by the drive cam.
  • the assembling property of the pump device can be improved by exhibiting the rocker arm positioning function on the drive device side when the pump device is assembled.
  • the rocker arm is set to be equal to or larger than the minimum value of the urging force that can separate the rocker arm from the drive cam.
  • the first urging force from the driven member to the rocker arm swinging end is the first urging force. It can be set smaller by 2 urging force.
  • the rocker arm is moved by the urging member on the rocking end side of the rocker arm.
  • the rocker arm can be supported at three points by any one of them and the pivot member and the urging member of the rocker arm support mechanism. Therefore, it is possible to prevent the rocker arm from being hit by the drive cam and to prevent damage to peripheral parts due to the rocking of the rocker arm, and to improve the assemblability and durability when the driven member is assembled.
  • An apparatus can be provided.
  • FIG. 3A is a top view of the vicinity of the rocker arm in the fuel pump driving apparatus according to the first embodiment of the present invention
  • FIG. 3B is a view taken along line IIIB in FIG.
  • shaft shows a spring load
  • shaft shows the stroke position of the plunger which is a driven member. Is shown.
  • FIG. 7A is a top view of the vicinity of the rocker arm in the drive device for the fuel pump according to the third embodiment of the present invention
  • FIG. 7B is a view taken along the arrow VIIB in FIG. 7A.
  • FIG. 1 to FIG. 4 are diagrams showing a driving apparatus according to a first embodiment of the present invention, and show an example in which the present invention is applied to a driving apparatus for a plunger pump type high-pressure fuel pump.
  • the fuel pump of this embodiment is attached to an internal combustion engine mounted on a vehicle, for example, a 4-cycle multi-cylinder gasoline engine (hereinafter simply referred to as an engine) as part of the fuel supply system.
  • This fuel pump supplies high-pressure fuel stored and stored in the delivery pipe to a delivery pipe that distributes high-pressure fuel to a plurality of in-cylinder injectors (fuel injection valves). Yes.
  • the fuel pump 10 of the present embodiment is connected to a feed pump FP provided in the fuel tank T via a pipe L, and is compared with the fuel pump 10 from the feed pump FP.
  • a fuel pressurized to a low feed pressure is introduced.
  • the feed pump FP is, for example, an electric low-pressure fuel pump, and pumps up gasoline that is fuel in the fuel tank T.
  • the fuel pump 10 is driven by the driving device 20.
  • the fuel pump 10 includes a pump body 11, a plunger 12 attached to the pump body 11 so as to be capable of reciprocating in the axial direction, and an end portion 12 a (upper end portion in FIG. 2) of the plunger 12 and the pump body 11. And a pressurizing chamber 13 defined.
  • the pump body 11 includes a suction passage 11a (fuel introduction passage) for introducing fuel from the feed pump FP into the pressurizing chamber 13, and fuel pressurized inside the pressurizing chamber 13 toward the delivery pipe.
  • a discharge passage 11b for discharging is formed.
  • the drive device 20 includes a drive cam 21, a rocker arm 22 that swings according to the rotation of the drive cam 21, and a rocker arm support mechanism 23 that supports the rocker arm 22 in a swingable manner in cooperation with the drive cam 21. It has.
  • the rocker arm support mechanism 23 has a pump mounting case 24 that is integrally attached to a part of the outer wall of the engine.
  • the plunger 12 of the fuel pump 10 is an input member (driven member) that urges the rocker arm 22 in a direction approaching the drive cam 21 on the other end 12b side.
  • the rocker arm 22 is reciprocated in the swing direction corresponding to the axial direction.
  • the pump body 11 of the fuel pump 10 is fitted into a plurality of flange portions 11f each having a bolt hole 11c and a pump mounting hole portion 24a of a pump mounting case 24 (support member). 11g, and is fastened to the pump mounting case 24 by a plurality of bolts (not shown) inserted into the plurality of bolt holes 11c.
  • the pump body 11 has a fuel introduction pipe part 11i and a fuel discharge pipe part 11j, and a fuel filter 17 is provided inside the fuel introduction pipe part 11i.
  • the plunger 12 is slidably inserted into the pump body 11 at one end 12 a side, and the pressurizing chamber 13 inside the pump body 11 changes (increases) its volume according to the reciprocating displacement of the plunger 12. ), The fuel can be sucked into the pressurizing chamber 13 and the fuel can be discharged from the pressurizing chamber 13.
  • the plunger 12 is driven by a drive cam 21 through the rocker arm 22 from the other end 12b side.
  • the drive cam 21 is provided in a cylinder head (not shown in detail) constituting the pump mounting case 24, and is driven by rotational power from the engine.
  • the drive cam 21 is integrally mounted on, for example, an exhaust camshaft (not shown in detail) of the engine.
  • a spring receiving portion 12c is mounted in the vicinity of the other end portion 12b of the plunger 12, and a compression coil spring 19 (elastic member) is incorporated in a compressed state between the spring receiving portion 12c and the pump body 11. It is.
  • the plunger 12 is constantly urged by the compression coil spring 19 in the direction of increasing the volume of the pressurizing chamber 13 (downward direction in FIG. 2). Therefore, when the drive cam 21 is rotationally driven by the power from the engine, the plunger 12 reciprocates in the axial direction according to the reciprocal swing of the rocker arm 22 according to the rotation of the drive cam 21.
  • the rocker arm 22 can freely rotate a swinging end portion 22 a that engages with the other end portion 12 b of the plunger 12, a base end portion 22 b that is supported on the pump mounting case 24 side, and a roller 22 r that engages with the drive cam 21. And an intermediate portion 22c to be held.
  • the rocker arm 22 is lubricated together with the other end portion 12b of the plunger 12 by engine oil in the cylinder head (oil from the outside).
  • a suction valve 14 made of a check valve that exhibits a blocking function and a discharge valve 16 made of a check valve that allows the fuel to be discharged from the pressurizing chamber 13 and that also functions to prevent a backflow are provided.
  • the suction valve 14 has a plate-like valve body 14a and an annular valve seat 14b for opening and closing the suction passage 11a, and a valve until a predetermined suction pressure (pressure lower than the feed pressure by a predetermined suction valve opening differential pressure) is reached. It is comprised by the valve spring 14c which hold
  • the discharge valve 16 includes a plate-like valve body 16a that opens and closes the discharge passage 11b and an annular valve seat 16b, and a predetermined discharge pressure (a pressure that is higher than the pressure of fuel in the delivery pipe by a predetermined discharge valve opening differential pressure). ) Until the valve body 16a comes into contact with the valve seat 16b.
  • the plunger 12 when the plunger 12 is displaced upward in FIG. 1 so as to decrease the volume of the pressurizing chamber 13, the fuel in the pressurizing chamber 13 is pressurized under the closed state of the intake valve 14 to increase its pressure.
  • the fuel can be discharged from the pressurizing chamber 13 while the discharge valve 16 is opened.
  • the plunger 12 when the plunger 12 is displaced downward in FIG. 1 so as to increase the volume of the pressurizing chamber 13, the fuel in the pressurizing chamber 13 is depressurized and the pressure is lowered, and the discharge valve 16 is closed.
  • the suction valve 14 can be opened below.
  • suction valve 14 is provided with an electromagnetic operation mechanism 15.
  • the electromagnetic operating mechanism 15 includes an operating member 15a slidably held in the pump body 11 so as to face the valve body 14a, and the operating member 15a with a biasing force larger than the biasing force of the valve spring 14c of the intake valve 14.
  • a valve opening operating spring 15b that urges toward the valve opening side of the valve body 14a, and an electromagnetic that can displace the operating member 15a toward the valve closing side of the valve body 14a against the urging force of the valve opening operating spring 15b.
  • a coil portion 15c is a coil portion 15c.
  • the electromagnetic operation mechanism 15 can suck the operation member 15a toward the electromagnetic coil portion 15c when the electromagnetic coil portion 15c is excited by energization (when in an ON state), and the valve body 14a of the intake valve 14 is a valve spring. It can be returned to the valve closing direction by the urging force of 14c. Further, the electromagnetic operating mechanism 15 forces the intake valve 14 against the urging force of the valve spring 14c by the valve opening operating spring 15b when the energization of the electromagnetic coil portion 15c is stopped and becomes a non-excited state (OFF state). The valve can be opened automatically.
  • the electromagnetic operation mechanism 15 variably controls the pressurization period of the fuel in the pressurization chamber 13 by the plunger 12 by controlling the period during which the intake valve 14 is forcibly opened by energization of the electromagnetic coil portion 15c. It can be done.
  • the rocker arm support mechanism 23 includes a pivot member 25 supported by the pump mounting case 24 so as to engage with the base end portion 22 b of the rocker arm 22 in addition to the pump mounting case 24, and a base end portion 22 b of the rocker arm 22.
  • the holding clip 26 made of a leaf spring (or a spring wire) attached to the pivot member 25 and the swinging end portion 22a of the rocker arm 22 are prevented from being detached from the distal end portion 25a of the pivot member 25.
  • an urging member 27 supported by the pump mounting case 24 to urge one side in the swinging direction.
  • the pivot member 25 is constituted by a substantially cylindrical shaft member fixed perpendicularly to the pump mounting case 24, and the rocker arm is cooperated with the holding clip 26 at the hemispherical tip portion 25a.
  • a base end portion 22b serving as a swing fulcrum portion of 22 is held so as to be tiltable and changeable in an arbitrary direction.
  • the holding clip 26 applies an appropriate contact surface pressure between the base end portion 22 b of the rocker arm 22 and the distal end portion 25 a of the pivot member 25, and serves as a rocking fulcrum (rocking center) of the rocker arm 22. It is designed to hold in place.
  • the base end portion 22b of the rocker arm 22 is formed with a concave spherical surface portion (no symbol) corresponding to the distal end portion 25a of the pivot member 25.
  • the urging member 27 is disposed on the rocker arm 22 on the side of the rocking end 22a in the longitudinal direction, that is, on the side that is separated from the base end 22b of the rocker arm 22 and close to the rocking end 22a.
  • the rocker arm 22 is engaged with the swinging end 22a from the front side. Further, the urging member 27 urges the rocking end portion 22a of the rocker arm 22 in, for example, a direction separating from the drive cam 21 (upper side in FIG. 1).
  • the urging member 27 includes a support end 27a supported by the pump mounting case 24 on the rocking end 22a side of the rocker arm 22 and a rocking end 22a of the rocker arm 22 from the other side in the rocking direction ( 1 has an engagement end portion 27b that engages (from the lower side to the upper side in FIG. 1), and an intermediate elastic body portion 27c that is interposed between the support end portion 27a and the engagement end portion 27b. Yes.
  • the intermediate elastic body portion 27c is configured by a leaf spring.
  • the urging member 27 is a plate spring that is entirely made of a spring metal material, and as shown in FIG.
  • the intermediate elastic body portion 27 c extends downward, and the engagement end portion 27 b extends obliquely upward from the lower end portion of the intermediate elastic body portion 27 c toward the swinging end portion 22 a of the rocker arm 22.
  • the biasing member 27 is curved between the support end portion 27a, the engagement end portion 27b, and the intermediate elastic body portion 27c, and has a sufficiently large length with respect to the width of the belt-like width direction. Yes.
  • the dimension of the band-like width direction of the urging member 27 may be changed at the support end portion 27a, the engagement end portion 27b, and the intermediate elastic body portion 27c, or may be the same.
  • the upward urging force (second urging force) of the urging member 27 that urges the rocking end 22 a of the rocker arm 22 in the direction separating the rocking arm 22 from the drive cam 21 drives the rocking end 22 a of the rocker arm 22. It becomes smaller than the downward biasing force (hereinafter referred to as the first biasing force) from the compression coil spring 19 (elastic member) that biases the plunger 12 downward in FIG. 1 so as to bias it toward the cam 21 side. Yes.
  • the engaging end portion 27 b of the urging member 27 is engaged with the rocking end portion 22 a of the rocker arm 22, and the oscillating end portion 22 a of the rocker arm 22 is driven by the drive cam 21. It is possible to suppress displacement in a direction different from the swinging direction (vertical direction in FIGS. 1 and 2) according to the rotation of the shaft, particularly in a direction orthogonal to the swinging direction (direction orthogonal to the paper surface of FIG. 2). It has become.
  • the other end portion 12 b of the plunger 12 is slidably engaged with one surface side of the rocking end portion 22 a of the rocker arm 22.
  • a recess 22e is formed on the other surface side of the rocking end 22a of the rocker arm 22 so that the engagement end 27b of the biasing member 27 is slidably engaged. .
  • a downward biasing force (hereinafter referred to as a first biasing force) f1 from the compression coil spring 19 applied from the plunger 12 to the swing end portion 22a of the rocker arm 22 is such that the plunger 12 11 is the largest at the position of the top dead center TDC where the pressure chamber 13 reaches the minimum volume by making the pressure chamber 13 the minimum volume, and the plunger 12 moves backward from the position of the top dead center TDC to bring the pressure chamber 13 to the maximum. It becomes the smallest at the position of the bottom dead center BDC.
  • the second urging force f2 applied from the urging member 27 to the rocking end 22a of the rocker arm 22 is minimized at the position of the top dead center TDC of the plunger 12, and at the position of the bottom dead center BDC of the plunger 12.
  • the maximum value is smaller than the minimum value of the first urging force f1 at the position of the bottom dead center BDC.
  • This second biasing force f2 is the minimum value of the upward biasing force in the vertical direction that can separate the rocker arm 22 from the drive cam 21 against the biasing force toward the drive cam 21 due to the weight of the rocker arm 22. It is set to f3 or more.
  • the spring characteristic of the urging member 27 may be a non-linear characteristic as indicated by the change in the second urging force f2 or a linear spring characteristic. Is smaller than the spring constant of the compression coil spring 19.
  • the pump body 11 is constituted by a plurality of cylindrical or annular segments (no reference numerals) that are adjacent in the axial direction and are fluid-tightly fitted to each other via a seal ring such as an O-ring. Has been.
  • an oil seal holder 18 that holds a plurality of seal rings 41 and 42 that engage with the plunger 12 is provided on the lower end side of the pump body 11 exposed in the pump mounting case 24 in the drawing.
  • the seal ring 41 is a fuel seal that suppresses fuel leakage by sealing the sliding gap portion between the plunger 12 and the pump body 11.
  • the seal ring 42 allows the engine oil in the cylinder head to be connected to the plunger 12.
  • An oil seal that suppresses entry into the sliding gap portion of the pump body 11 is provided.
  • the drive cam 21 rotates in the rotation direction indicated by the white arrow in FIG.
  • the first urging force downward in FIG. 1 from the plunger 12 side that urges the rocker arm 22 toward the drive cam 21 is normally applied to the rocking end 22a of the rocker arm 22, the rocker arm 22 While being supported at three points by the pivot member 25, the plunger 12 and the drive cam 21, it swings back and forth in the vertical direction in the figure according to the rotation of the drive cam 21.
  • the plunger 12 is baked on the pump body 11 side, or a foreign object enters between the plunger 12 and the pump body 11 to impair the slidability of the plunger 12.
  • the plunger 12 is forcibly moved to the top dead center by the drive cam 21, but cannot be lowered smoothly by the urging force from the compression coil spring 19, and the rocker arm 22 is moved to the drive cam 21 side.
  • the first biasing force to be biased will be significantly reduced.
  • the rocker arm 22 has the pivot member 25 and the urging member 27 of the rocker arm support mechanism 23, and the urging member 27.
  • the rocking end 22a of the rocker arm 22 is supported at three points by the plunger 12 biased.
  • the rocker arm 22 can be reliably avoided from flapping by striking from the drive cam 21, and damage to peripheral components due to the rocker arm 22 flapping can be suppressed. become.
  • rocker arm 22 is supported in a fixed posture by the pivot member 25 and the urging member 27 of the rocker arm support mechanism 23 before the fuel pump 10 is assembled to the drive device 20.
  • the positioning function of the rocker arm 22 can be exerted, and the engagement of the plunger 12 with the rocker arm 22 and other assembly properties of the fuel pump 10 can be improved.
  • the biasing member 27 disposed on the rocking end 22a side of the rocker arm 22 biases the rocking end 22a of the rocker arm 22 in the direction separating the driving cam 21. Even if the urging force from the plunger 12 is lost due to some abnormality, the drive cam 21 and the rocker arm 22 can be separated to avoid damage caused by striking between them. Further, even during normal operation, the frictional force at the base end portion 22b of the rocker arm 22 is not increased beyond the level required for holding the fulcrum by the urging force from the urging member 27, and the durability of the drive device 20 is not increased. Improves.
  • the plunger 12 urges the rocking end portion 22 a of the rocker arm 22 toward the drive cam 21 with a first urging force
  • the urging member 27 serves as the rocking end portion of the rocker arm 22.
  • 22a is biased with a second biasing force smaller than the first biasing force. Therefore, when the first urging force is normal, the rocker arm 22 can be reliably swung according to the urging force from the plunger 12 side and the rotation of the drive cam 21, while the first urging force. Is lowered abnormally, the rocker arm 22 is biased toward the plunger 12 by the second biasing force from the biasing member 27, and the support state of the rocker arm 22 is prevented from becoming unstable.
  • the urging member 27 can suppress displacement of the rocking end 22a of the rocker arm 22 in a direction orthogonal to the rocking direction according to the rotation of the drive cam 21.
  • the rocker arm 22 Before the plunger 12 is assembled, the rocker arm 22 can be positioned in a fixed position, for example, at a specific position in the rocking arm 22 in the vertical rocking direction in the figure and in the turning direction perpendicular thereto. Assembling of the plunger 12 engaged with the portion 22a can be facilitated.
  • the urging member 27 can be easily disposed within the installation range of the rocker arm 22 in the reciprocating direction of the plunger 12, and the rocker arm 22 is attached to the pump mounting case 24 even before the drive cam 21 and the rocker arm 22 are engaged. It can be supported in a fixed posture. Moreover, even if the length of the leaf spring constituting the biasing member 27 is relatively large, it can be easily arranged. Therefore, a sufficiently long bias arm length and an optimum width are set so that the biasing spring has a low spring constant and high durability. The member 27 can be realized.
  • the plunger 12 as a driven member driven by the driving device 20 is an input member of the fuel pump 10, and the side closer to the driving cam 21 in the rocking direction of the rocker arm 22 by the compression coil spring 19. Is being energized. Therefore, the plunger 12 of the fuel pump 10 can be reciprocated according to the rocker arm 22 swinging according to the rotation of the drive cam 21, and the drive device 20 suitable for the high pressure pump is obtained.
  • the urging member 27 moves the rocker arm 22 to the plunger 12 side.
  • the rocker arm 22 can be supported at three points by the plunger 12 and the pivot member 25 and the urging member 27 of the rocker arm support mechanism 23. Accordingly, it is possible to prevent the rocker arm 22 from being hit by the drive cam 21 and to suppress the damage of peripheral parts due to the rocking of the rocker arm 22, and to improve the assemblability and durability when the plunger 12 is assembled. It is possible to provide the drive device 20 that can perform the above-described operation.
  • FIG. 5 is a diagram showing a driving apparatus according to the second embodiment of the present invention.
  • the fuel pump drive device of each embodiment described below is a drive device that drives a fuel pump similar to the fuel pump 10 in the first embodiment described above, and is a rocker arm.
  • the configuration of the biasing member of the support mechanism is different, the other configuration is substantially the same as that of the first embodiment, and therefore only the differences from the first embodiment will be described in detail below.
  • the drive device 50 of this embodiment includes a drive cam 21, a rocker arm 22 that swings according to the rotation of the drive cam 21, and a rocker arm 22 that cooperates with the drive cam 21. And a rocker arm support mechanism 53 that is movably supported.
  • the rocker arm support mechanism 53 has a pump mounting case 24 that is integrally attached to a part of the outer wall of the engine.
  • the rocker arm support mechanism 53 has a pump mounting case 24, a pivot member 25, a holding clip 26, and a rocking end 22a of the rocker arm 22 on one side in the rocking direction. And a biasing member 57 supported by the pump mounting case 24 so as to bias in the upward direction.
  • the urging member 57 includes a support end portion 57 a that is vertically supported by the pump mounting case 24 and an engagement end portion 57 b that engages with the rocking end portion 22 a of the rocker arm 22. It is composed of separate parts that are fitted (engaged) so as to be relatively displaceable. An intermediate elastic body 57c made of a compression coil spring is contracted between the support end 57a and the engagement end 57b.
  • the supporting end portion 57a of the urging member 57 is a columnar member extending in the vertical direction, and has a diameter-expanded portion 57f at the lower end thereof.
  • the engaging end portion 57b of the urging member 57 is supported so as to be vertically movable relative to the supporting end portion 57a on the base end side, and engages with the swinging end portion 22a of the rocker arm 22 on the distal end side. is doing.
  • the intermediate elastic body portion 57c surrounds the support end portion 57a and is guided by the support end portion 57a, and the base of the engagement end portion 57b is urged (pressed) upward in the drawing. It arrange
  • the biasing member 57 is disposed on the rocking arm 22 on the side of the rocking end 22a in the longitudinal direction, that is, on the side that is separated from the base end 22b of the rocker arm 22 and close to the rocking end 22a. Has been. Further, the urging member 57 urges the rocking end 22a of the rocker arm 22 in a direction (upward in FIG. 5) in which the oscillating end 22a is separated from the drive cam 21, for example.
  • the upward second biasing force f2 of the biasing member 57 that biases the rocking end 22a of the rocker arm 22 away from the drive cam 21 causes the rocking end 22a of the rocker arm 22 to move toward the drive cam 21. It is smaller than the downward first biasing force f1 from the compression coil spring 19 that biases the plunger 12 downward so as to bias the plunger 12 downward.
  • the engaging end portion 57b of the urging member 57 is engaged with the rocking end portion 22a of the rocker arm 22 so that the rocking end portion 22a of the rocker arm 22 is driven by the drive cam 21. It is possible to suppress displacement in a direction different from the rocking direction (vertical direction in FIG. 5) according to the rotation of the rotation, particularly in a direction perpendicular to the rocking direction (direction perpendicular to the paper surface of FIG. 5). Yes.
  • the spring characteristic of the intermediate elastic body portion 57c of the urging member 57 may be a non-linear characteristic as indicated by a change in the second urging force f2 or may be a linear spring characteristic.
  • the spring constant of 57 is smaller than the spring constant of the compression coil spring 19.
  • the urging member 57 urges the rocker arm 22 toward the plunger 12 side.
  • the rocker arm 22 can be supported at three points by the plunger 12 and the pivot member 25 and the urging member 57 of the rocker arm support mechanism 53. Accordingly, it is possible to prevent the rocker arm 22 from being hit by the drive cam 21 and to suppress the damage of peripheral parts due to the rocking of the rocker arm 22, and to improve the assemblability and durability when the plunger 12 is assembled. It is possible to provide a driving device 50 that can
  • FIGS. 6 and 7 are views showing a driving apparatus according to the third embodiment of the present invention.
  • the rocker arm support mechanism 63 includes the pump mounting case 24, the pivot member 25, the holding clip 26, and the rocking end 22 a of the rocker arm 22. And a biasing member 67 supported by the pump mounting case 24 so as to bias in the downward direction in FIG. 6 which is one side of the swinging direction.
  • the urging member 67 is disposed on the rocking end 22 a side in the longitudinal direction with respect to the rocker arm 22, and urges the rocking arm 22 in the direction of separating the rocking end 22 a from the drive cam 21. It has become.
  • the biasing member 67 swings on the support end 67 a supported by the pump mounting case 24 on the swing end 22 a side away from the base end 22 b of the rocker arm 22 and the swing end 22 a of the rocker arm 22.
  • an engagement end portion 67b provided with a pair of hook portions 67h to be engaged from the other side in the moving direction (from the upper side to the lower side in FIG. 6), and the support end portion 67a and the engagement end
  • An intermediate elastic body portion 67c interposed between the portions 67b is provided.
  • the intermediate elastic body portion 67c is configured by a leaf spring.
  • the urging member 67 is a plate spring that is entirely made of a metal material for spring, and as shown in FIG.
  • the intermediate elastic body portion 67c extends downward, and the engagement end portion 67b extends obliquely upward from the lower end portion of the intermediate elastic body portion 67c toward the swinging end portion 22a of the rocker arm 22.
  • a pair of hook portions 67h provided integrally on both sides in the width direction of the engagement end portion 67b engage with the swing end portion 22a of the rocker arm 22 from the other side in the swing direction, and drive the rocker arm 22.
  • the urging force is applied in a direction to approach the cam 21.
  • the downward second biasing force f2 that biases the rocking end 22a of the rocker arm 22 in a direction approaching the drive cam 21 causes the rocking end 22a of the rocker arm 22 to move toward the drive cam 21. It is smaller than the downward first biasing force f1 from the compression coil spring 19 that biases the plunger 12 downward so as to bias the plunger 12 downward.
  • the pair of hook portions 67h of the engaging end portion 67b of the urging member 67 are engaged with both side surfaces of the rocking end portion 22a of the rocker arm 22, and the urging member 67 is rocked by the rocker arm 22.
  • the moving end 22a is displaced in a direction different from the swinging direction (vertical direction in FIG. 6) according to the rotation of the drive cam 21, particularly in a direction orthogonal to the swinging direction (direction orthogonal to the paper surface in FIG. 6). Can be suppressed.
  • the spring characteristic of the intermediate elastic body portion 67 c of the urging member 67 may be a non-linear characteristic or a linear characteristic, but the spring constant of the urging member 67 is smaller than the spring constant of the compression coil spring 19.
  • the urging member 67 urges the rocker arm 22 to the drive cam 21 side.
  • the rocker arm 22 can be supported at three points by the drive cam 21 and the pivot member 25 and the urging member 67 of the rocker arm support mechanism 63. Accordingly, it is possible to prevent the rocker arm 22 from being hit by the drive cam 21 and to suppress the damage of peripheral parts due to the rocking of the rocker arm 22, and to improve the assemblability and durability when the plunger 12 is assembled. It is possible to provide a driving device 60 that can
  • the second urging force f2 urges the rocking end 22a of the rocker arm 22 in a direction in which the rocker arm 22 approaches the drive cam 21, so that the plunger 12 moves to the rocking end 22a of the rocker arm 22.
  • the first urging force f1 can be set smaller by the second urging force f2, which is further advantageous in terms of assembly workability and durability.
  • FIG. 8 is a diagram showing a driving apparatus according to the fourth embodiment of the present invention.
  • the drive device 70 of the present embodiment includes a drive cam 21, a rocker arm 22 that swings according to the rotation of the drive cam 21, and a rocker arm 22 that cooperates with the drive cam 21. And a rocker arm support mechanism 73 that is movably supported.
  • the rocker arm support mechanism 73 has a pump mounting case 24 that is integrally attached to a part of the outer wall of the engine.
  • the rocker arm support mechanism 53 has the pump mounting case 24, the pivot member 25, the holding clip 26, and the rocking end 22a of the rocker arm 22 on one side in the rocking direction. And a biasing member 77 supported by the pump mounting case 24 so as to bias in the downward direction.
  • the urging member 77 includes a support end portion 77 a that is vertically supported by the pump mounting case 24 and an engagement end portion 77 b that engages with the rocking end portion 22 a of the rocker arm 22. It is composed of separate parts that are fitted (engaged) so as to be relatively displaceable. An intermediate elastic body 77c made of a compression coil spring is contracted between the support end 77a and the engagement end 77b.
  • the support end 77a of the urging member 77 is a columnar member extending in the vertical direction, and has a diameter-expanded portion 77f at the lower end thereof.
  • the engaging end 77b of the urging member 77 is supported so that it can move up and down in the vertical direction with respect to the support end 77a on its base end side, and engages with the swinging end portion 22a of the rocker arm 22 on its distal end side. is doing.
  • the intermediate elastic body portion 77c surrounds the support end portion 77a and is guided by the support end portion 77a, and the engagement end portion 77b is urged (depressed) downward in the figure. It arrange
  • the urging member 77 is disposed on the rocking arm 22 on the side of the rocking end 22a in the longitudinal direction, that is, on the side that is separated from the base end 22b of the rocker arm 22 and close to the rocking arm 22a. Has been. Further, the urging member 77 urges the rocking end 22a of the rocker arm 22 in one direction of the rocking direction, for example, in a direction approaching the drive cam 21 (downward side in FIG. 8). .
  • the downward second biasing force f2 of the biasing member 77 that biases the rocking end 22a of the rocker arm 22 toward the drive cam 21 biases the rocking end 22a of the rocker arm 22 toward the driving cam 21.
  • it is smaller than the downward first biasing force f1 from the compression coil spring 19 that biases the plunger 12 downward.
  • the spring characteristic of the intermediate elastic body 77c of the urging member 77 may be either a non-linear characteristic or a linear characteristic, but the spring constant of the urging member 77 is smaller than the spring constant of the compression coil spring 19.
  • the urging member 77 urges the rocker arm 22 to the drive cam 21 side.
  • the rocker arm 22 can be supported at three points by the drive cam 21 and the pivot member 25 and the urging member 77 of the rocker arm support mechanism 73. Accordingly, the drive cam 21 and the rocker arm 22 are brought into contact with each other with an appropriate contact pressure, so that the rocking of the rocker arm 22 by the drive cam 21 can be avoided, and damage to peripheral parts due to flapping of the rocker arm 22 can be suppressed.
  • the driving device 70 that can improve the assembling property and durability at the time of assembling.
  • the swinging range of the rocker arm 22 can be clearly defined by the biasing member 77, and the first biasing force f1 can be set smaller by the second biasing force f2. This is also advantageous.
  • each of the drive devices 20, 50, 60, 70 drives the fuel pump 10 for high-pressure pressurization.
  • the drive device of the present invention is not a fuel pump. It is also suitable for driving a plunger type pump, and is applicable to other devices having an input member that reciprocates in the rocking direction of the rocker arm.
  • rocker arm is configured so that the contact pressure at the concave spherical surface portion 22d of the base end portion 22b of the rocker arm 22 can be reduced to the same extent as that with a roller.
  • Other inclusions may be interposed between the drive cams, or a configuration in which rolling elements corresponding to a plurality of convex portions are mounted on the drive cam side may be employed.
  • the drive device is provided on the rocking end side of the rocker arm even if any abnormality occurs on the driven member side and the urging force from the driven member side to the rocker arm decreases.
  • the rocker arm is supported at three points by any one of them and the pivot member and the urging member of the rocker arm support mechanism. Therefore, it is possible to prevent the rocker arm from being hit by the drive cam and to prevent damage to peripheral parts due to the rocking of the rocker arm, and to improve the assemblability and durability when the driven member is assembled.
  • An apparatus can be provided.
  • the present invention as described above is a general drive device that reciprocates a driven member by a rocker arm, and in particular, a general drive device that is suitable for driving a high-pressure fuel pump that pressurizes fuel of an internal combustion engine to a high pressure capable of in-cylinder injection. Useful for.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
PCT/JP2011/007304 2011-12-27 2011-12-27 駆動装置 WO2013098883A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN201180075901.1A CN104053867B (zh) 2011-12-27 2011-12-27 驱动装置
PCT/JP2011/007304 WO2013098883A1 (ja) 2011-12-27 2011-12-27 駆動装置
JP2013551030A JP5867515B2 (ja) 2011-12-27 2011-12-27 駆動装置
DE112011106042.4T DE112011106042B4 (de) 2011-12-27 2011-12-27 Antriebsvorrichtung

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WO2013098883A1 true WO2013098883A1 (ja) 2013-07-04

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CN (1) CN104053867B (de)
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Citations (1)

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JPH08510026A (ja) * 1993-03-11 1996-10-22 モートレンファブリーク ハッツ ゲゼルシャフト ミット ベシュレンクテル ハフツング ウント コンパニー コマンデイトゲゼルシャフト ディーゼル・エンジン用噴射ポンプ

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Publication number Priority date Publication date Assignee Title
JPS634307U (de) 1986-06-25 1988-01-12
JPS634308U (de) * 1986-06-25 1988-01-12
JPH0521163U (ja) 1991-08-30 1993-03-19 株式会社小松製作所 ユニツトインジエクタ用プツシユロツド脱落防止装置
JP3938339B2 (ja) * 2001-07-26 2007-06-27 本田技研工業株式会社 内燃機関の動弁制御装置
JP2004308615A (ja) * 2003-04-10 2004-11-04 Toyota Motor Corp 高圧ポンプ
JP2005009451A (ja) * 2003-06-20 2005-01-13 Otics Corp バルブ開閉装置
JP4238874B2 (ja) * 2006-01-19 2009-03-18 トヨタ自動車株式会社 内燃機関のカムシャフト支持構造
DE102006052821A1 (de) * 2006-11-09 2008-05-15 Schaeffler Kg Schlepphebel zur Betätigung eines Gaswechselventils einer Brennkraftmaschine
JP4865675B2 (ja) * 2007-10-26 2012-02-01 株式会社オティックス 動弁装置及び支持部材
JP5137627B2 (ja) * 2008-03-07 2013-02-06 株式会社オティックス ロッカアームユニット及びロッカアームユニットの組立方法

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JPH08510026A (ja) * 1993-03-11 1996-10-22 モートレンファブリーク ハッツ ゲゼルシャフト ミット ベシュレンクテル ハフツング ウント コンパニー コマンデイトゲゼルシャフト ディーゼル・エンジン用噴射ポンプ

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JPWO2013098883A1 (ja) 2015-04-30
DE112011106042T5 (de) 2014-10-09
JP5867515B2 (ja) 2016-02-24
CN104053867A (zh) 2014-09-17
CN104053867B (zh) 2016-12-07
DE112011106042B4 (de) 2018-08-09

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