WO2009119398A1 - ラッシュアジャスタ - Google Patents
ラッシュアジャスタ Download PDFInfo
- Publication number
- WO2009119398A1 WO2009119398A1 PCT/JP2009/055249 JP2009055249W WO2009119398A1 WO 2009119398 A1 WO2009119398 A1 WO 2009119398A1 JP 2009055249 W JP2009055249 W JP 2009055249W WO 2009119398 A1 WO2009119398 A1 WO 2009119398A1
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- WO
- WIPO (PCT)
- Prior art keywords
- screw
- nut member
- lash adjuster
- initial setting
- adjustment screw
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/20—Adjusting or compensating clearance
- F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/181—Centre pivot rocking arms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/185—Overhead end-pivot rocking arms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2305/00—Valve arrangements comprising rollers
Definitions
- This invention relates to a lash adjuster incorporated in an engine valve gear.
- valve operating device that operates a valve provided at the intake port or exhaust port of an engine
- the central part of the arm supported so as to be swingable with one end as a fulcrum is pushed down by a cam, and the valve stem is moved at the other end of the arm.
- One end of the arm that is pushed down (swing arm type valve operating device) or the arm supported so as to be able to swing with the center as a fulcrum is pushed up with a cam, and the valve stem is pushed down at the other end of the arm
- a thing rocker arm type valve gear
- a lash adjuster is generally incorporated in the valve operating device, and the lash adjuster absorbs the change in the gap between the components of the valve operating device.
- the screw member is engaged with a nut member inserted into a receiving hole opened in the lower surface of the arm that swings according to the rotation of the cam, and a female screw formed on the inner periphery of the nut member.
- An adjusting screw having a male screw on the outer periphery thereof, and a return spring that urges the adjusting screw in a direction protruding downward from the nut member, and pressing the valve stem of the valve operating device with the adjusting screw.
- a method of initially setting the adjustment screw a method of forming a small-diameter through hole in the adjustment screw and the nut member and inserting a set pin into the through hole to stop the adjustment screw can be considered.
- the initial setting work is complicated.
- the initial setting can be performed only in a state where the adjusting screw is screwed to a predetermined height, and the degree of freedom of the initial setting is low.
- the problem to be solved by the present invention is to provide a lash adjuster capable of repeatedly initially setting an adjustment screw.
- an initial set member sandwiched between the adjustment screw and the nut member is detachably provided, a frictional force between the initial set member and the adjustment screw, and between the initial set member and the nut member.
- the lash adjuster adopts a configuration in which the adjusting screw is fixed to the nut member by the frictional force of. In this way, the adjustment screw can be repeatedly initially set by attaching and detaching the initial setting member.
- a lash adjuster having the following configuration can be adopted.
- the adjusting screw has a head having an outer diameter larger than the inner diameter of the nut member at a protruding portion from the nut member, and the initial set member is sandwiched between the head of the adjusting screw and the nut member.
- a pair of arm portions and an operation knob portion for connecting one ends of the arm portions, and the arm portions are formed to be elastically compressible between the head of the adjusting screw and the nut member. .
- At least one of the outer periphery of the adjustment screw and the inner periphery of the nut member is provided with a notch that opens an insertion port between the adjustment screw and the nut member, and the initial set member is elastic to the insertion port. Inserted in a compressed state.
- the lash adjuster having the structure of 1), when the adjusting screw is screwed into the nut member and the arm portion of the initial setting member is compressed between the head of the adjusting screw and the nut member, the elastic restoring force of the arm portion causes the arm to move. A frictional force is generated between the portion and the head of the adjusting screw, and a frictional force is also generated between the arm portion and the nut member, and the adjusting screw can be initially set by the frictional force. Further, the initial set of the adjusting screw can be released by pulling out the initial setting member from between the head of the adjusting screw and the nut member.
- an initial setting member having the following configuration can be employed as the initial setting member.
- 1b) and 1c) can be provided with a jig insertion hole in the operation knob portion. If it does in this way, a jig
- the lash adjuster of 2) above is adjusted with the initial set member and the adjuster by the elastic restoring force of the initial set member.
- a frictional force is generated between the screws and a frictional force is generated between the initial setting member and the nut member, and the adjustment screw can be initially set by the frictional force.
- the initial setting member can be released by pulling the initial setting member out of the insertion slot.
- a pivot member inserted in the nut member so as to be slidable in the axial direction, and an insertion end of the pivot member into the nut member are supported,
- An adjusting screw comprising a male screw member having a male screw on the outer periphery and an elastic member sandwiched between the pivot member and the male screw member can be employed.
- the notch is formed on the outer periphery of the pivot member. can do.
- examples of the notch include a D-cut portion and a two-chamfered portion formed on the outer periphery of the adjustment screw.
- the cutout so as to divide the male screw on the outer periphery of the adjustment screw
- the initial setting member is provided with a pulling-out operation part capable of placing a finger, the initial setting member can be pulled out by placing the finger on the pulling-out operation part, The initial set can be released easily. Further, when the initial setting member is formed of rubber or resin, the weight can be reduced as compared with the case where the initial setting member is formed of metal such as iron.
- the present invention can be applied to, for example, the following lash adjuster.
- a lash adjuster of a swing arm type valve operating device wherein the nut member is inserted into a receiving hole opened on an upper surface of a cylinder head, and the adjusting screw supports an arm of the valve operating device in a swingable manner.
- the nut member is inserted into a receiving hole opened in the lower surface of the arm that swings according to the rotation of the cam, and the adjusting screw is a lash adjuster of the rocker arm type valve operating device that presses the valve stem of the valve operating device. .
- the adjustment screw is fixed by an initial setting member that is detachably provided, so that the adjustment screw can be repeatedly initialized.
- the adjusting screw is screwed to the end and is initially set, so fine adjustment of the screwing of the adjusting screw is performed. There is no need, and initial setting work is easy.
- the adjustment screw is moved to an arbitrary height, and the initial setting is performed in that state.
- the member By inserting the member, it is possible to initially set the adjustment screw at an arbitrary height.
- FIG. 1 is an enlarged cross-sectional view of a lash adjuster showing a state before the adjustment screw shown in FIG. 1 is initially set.
- FIG. 2 is an enlarged cross-sectional view showing a state in which the adjustment screw shown in FIG. 2 is initially set.
- the front view which shows the state which cancelled
- FIG. 2 is an enlarged perspective view showing another modification of the initial set member shown in FIGS.
- the figure which shows the state which set the adjustment screw initially with the initial setting member shown in FIG.
- the front view which shows the valve operating apparatus incorporating the lash adjuster of 2nd Embodiment of this invention.
- FIG. 11 is an enlarged sectional view in the vicinity of the lash adjuster.
- Front view showing a valve gear incorporating a lash adjuster according to a third embodiment of the present invention.
- FIG. 13 is an enlarged sectional view of the lash adjuster shown in FIG. Sectional view along line XV-XV in FIG. The expanded sectional view which shows the state which inserted the elastic part of the initial set member shown in FIG.
- FIG. 14 is a perspective view of the initial setting member shown in FIG. Sectional drawing which shows the modification of the lash adjuster shown in FIG. Sectional view along line XX-XX in FIG.
- the expanded sectional view which shows the state which extracted the elastic part of the initial set member shown in FIG. 19 from the insertion port
- Front view showing a valve gear incorporating a lash adjuster according to a fourth embodiment of the present invention.
- FIG. 1 shows a valve gear incorporating a lash adjuster 1 according to the first embodiment of the present invention.
- This valve operating apparatus has a valve 4 provided in an intake port 3 of an engine cylinder head 2, a valve stem 5 connected to the valve 4, and an arm 7 that swings in response to rotation of a cam 6. .
- the valve stem 5 extends upward from the valve 4 and slidably penetrates the cylinder head 2.
- An annular spring retainer 8 is fixed to the upper outer periphery of the valve stem 5, and a valve spring 9 is incorporated between the lower surface of the spring retainer 8 and the upper surface of the cylinder head 2.
- the valve spring 9 urges the valve stem 5 upward via the spring retainer 8, and the valve 4 is seated on the valve seat 10 by the urging force.
- the arm 7 is supported at one end by a lash adjuster 1 so as to be swingable, and the other end is in contact with the upper end of the valve stem 5.
- a roller 11 that is pressed by a cam 6 provided above the arm 7 is attached to the center of the arm 7.
- the cam 6 is formed integrally with a camshaft 12 that rotates in synchronization with an engine crankshaft (not shown).
- the lash adjuster 1 includes a cylindrical nut member 14 that is inserted into a receiving hole 13 that is open on the upper surface of the cylinder head 2, and a female screw 15 that is formed on the inner periphery of the nut member 14.
- An adjustment screw 17 having a male screw 16 on the outer periphery of the lower portion thereof, and a return spring 19 incorporated between the adjustment screw 17 and the bottom portion 18 of the nut member 14.
- the male screw 16 and the female screw 15 are configured such that the flank angle of the pressure side flank 20 that receives pressure when a load in the direction of pushing the adjusting screw 17 into the nut member 14 is applied,
- the adjustment is performed by the frictional resistance between the pressure side flank 20, 20 of the male screw 16 and the female screw 15.
- the adjustment screw 17 is rotated by the slip between the play side flank 21, 21 of the male screw 16 and the female screw 15. It is allowed.
- a flank angle of the pressure side flank 20 of 75 ° and a flank angle of the play side flank 21 of 15 ° can be employed.
- the return spring 19 is a compression coil spring, and is incorporated in the nut member 14 while being compressed in the axial direction.
- the return spring 19 has a lower end supported by the bottom 18 of the nut member 14, and an upper end giving an axial force to the adjustment screw 17 in a direction protruding from the nut member 14 via the spring seat 22.
- the adjusting screw 17 is urged by the axial force in a direction protruding upward from the nut member 14.
- the adjustment screw 17 has a head portion 23 having an outer diameter larger than the inner diameter of the nut member 14 at a protruding portion from the upper end surface of the nut member 14. As shown in FIG. 1, the head 23 is fitted into a recess 24 formed on the lower surface of the end of the arm 7 to support the arm 7.
- the head 23 has a hemispherical contact surface with the recess 24, and the arm 7 can swing by sliding between the head 23 and the recess 24.
- an initial setting member 25 formed by bending a metal wire is inserted between the lower end surface of the head 23 and the upper end surface of the nut member 14.
- the initial setting member 25 is an operation of connecting a pair of arm portions 26, 26 that are opposed to each other in the radial direction with the adjustment screw 17 therebetween and one end of each of the arm portions 26, 26. It consists of a knob part 27.
- each arm portion 26 imparts axial elasticity by bending a portion of the wire rod sandwiched between the lower end surface of the head 23 and the upper end surface of the nut member 14 into a corrugated shape. Has been.
- the above-described lash adjuster 1 is incorporated into the valve gear as follows.
- the lash adjuster 1 is inserted into the accommodation hole 13 of the cylinder head 2, and the arm 7 and the camshaft 12 are attached to the valve operating device.
- the initial setting member 25 is pulled out between the head 23 of the adjusting screw 17 and the nut member 14.
- the initial setting of the adjusting screw 17 is released, and the adjusting screw 17 moves in the protruding direction while rotating by the urging force of the return spring 19, and the end of the arm 7 is moved to a position where the roller 11 contacts the cam 6. Push up.
- the biasing force of the valve spring 9 acts on the adjustment screw 17 even when the base circle 6b of the cam 6 is at the position of the roller 11.
- the amount of protrusion of the adjusting screw 17 when the cam 6 further rotates and the load in the pushing direction is released is smaller than the amount of pushing of the adjusting screw 17 when the cam crest 6a of the cam 6 pushes down the arm 7.
- the adjustment screw 17 gradually moves in the pushing direction and the valve stem 5 rises, so that no gap is generated between the contact surfaces of the valve 4 and the valve seat 10.
- the adjustment screw 17 protrudes from the nut member 14 by the urging force of the return spring 19. In this case, the head 23 and the nut member 14 of the adjustment screw 17 are projected. After the initial setting member 25 is inserted in between, the adjusting screw 17 can be rotated and screwed into the nut member 14 to reset the adjusting screw 17 again.
- the adjustment screw 17 can be repeatedly initially set.
- the lash adjuster 1 is low in manufacturing cost because it is not necessary to provide a through-hole through which the set pin is inserted in the adjusting screw 17 or the nut member 14.
- the initial setting member 25 formed by bending a metal wire is described as an example of the initial setting member sandwiched between the head 23 of the adjusting screw 17 and the nut member 14.
- an initial setting member 28 formed by press-molding a metal plate material may be employed.
- the initial setting member 28 includes a pair of arm portions 29, 29 that are opposed to each other in the radial direction with the adjustment screw 17 therebetween, and an operation knob portion 30 that connects one end of each of the arm portions 29, 29. It consists of.
- Each arm portion 29 is given elasticity in the axial direction by bending a plate material at a portion sandwiched between the lower end surface of the head portion 23 and the upper end surface of the nut member 14 into a corrugated shape.
- a jig insertion hole 31 penetrating vertically is formed in the operation knob portion 30, and a jig (not shown) is inserted into the jig insertion hole 31 so that the initial setting member 28 can be pulled out. It can be done.
- an initial setting member 32 formed by injection molding a resin having elasticity may be employed.
- the initial setting member 32 includes a pair of arm portions 33, 33 that are opposed to each other in the radial direction with the adjustment screw 17 therebetween, and an operation knob portion 34 that connects one end of each of the arm portions 33, 33. It consists of. Further, a jig insertion hole 35 penetrating vertically is formed in the operation knob portion 34 so that the initial setting member 32 can be pulled out by inserting the jig into the jig insertion hole 35. It has become.
- FIG. 11 shows a valve gear incorporating a lash adjuster 41 according to the second embodiment of the present invention.
- This valve operating apparatus has a valve 44 provided at an intake port 43 of an engine cylinder head 42, a valve stem 45 connected to the valve 44, and an arm 47 that swings in response to rotation of a cam 46. .
- valve stem 45 extends upward from the valve 44, and a spring retainer 48 is fixed to the upper portion of the valve stem 45.
- the spring retainer 48 is biased upward by a valve spring 49, and the valve 44 is seated on the valve seat 50 by the biasing force.
- the arm 47 is supported by a fulcrum shaft 51 so that the center portion can swing.
- a roller 52 that contacts the cam 46 is attached to one end of the arm 47, and a lash adjuster 41 is incorporated into the other end of the arm 47.
- the cam 46 provided below the arm 47 rotates in synchronization with the crankshaft (not shown) of the engine, and the cam crest 46b raised from the base circle 46a presses the roller 52 to press the arm 47. Is made to swing.
- the lash adjuster 41 is screw-engaged with a cylindrical nut member 54 inserted into the accommodation hole 53 opened on the lower surface of the arm 47 and a female screw 55 formed on the inner periphery of the nut member 54.
- An adjustment screw 57 having a male screw 56 on the outer periphery of the upper portion, and a return spring 59 incorporated between the adjustment screw 57 and the inner bottom surface 58 of the accommodation hole 53.
- the male screw 56 and the female screw 55 have a sawtooth shape in which the flank angle of the pressure side flank 60 that receives pressure when a load in the direction of pushing the adjusting screw 57 into the nut member 54 is applied is larger than the flank angle of the play side flank 61.
- the rotation of the adjustment screw 57 is prevented by the frictional resistance between the pressure side flank 60, 60 of the male screw 56 and the female screw 55.
- the adjustment screw 57 is allowed to rotate by sliding between the play side flank 61, 61 of the male screw 56 and the female screw 55. It has become.
- the return spring 59 is a compression coil spring.
- the return spring 59 has an upper end supported by the inner bottom surface 58 of the accommodation hole 53 and a lower end that applies an axial force in a direction protruding from the nut member 54 via the spring seat 62 to the adjustment screw 57. Due to the axial force, the adjusting screw 57 is urged in a direction protruding downward from the nut member 54.
- the adjusting screw 57 has a head portion 63 having an outer diameter larger than the inner diameter of the nut member 54 at a protruding portion from the lower end surface of the nut member 54, and the upper end of the valve stem 45 is pressed by the head portion 63.
- the initial setting member 25 described in the first embodiment is inserted between the upper end surface of the head 63 and the lower end surface of the nut member 54.
- the initial setting member 25 includes a pair of arm portions 26 and 26 that are opposed to each other in the radial direction with an adjustment screw 57 interposed therebetween, and an operation knob portion 27 that connects one end of each of the arm portions 26 and 26.
- the lash adjuster 41 is screwed with the adjustment screw 57 in a state where the arm portion 26 of the initial setting member 25 is inserted between the head portion 63 of the adjustment screw 57 and the nut member 54.
- the elastic restoring force of the arm portion 26 generates a frictional force between the arm portion 26 and the head 63, and between the arm portion 26 and the nut member 54.
- a frictional force is also generated, and the adjustment screw 57 can be initially set by the frictional force.
- the initial setting member 25 When the initial setting member 25 is pulled out between the head 63 and the nut member 54, the initial setting of the adjusting screw 57 can be released. As a result, the adjusting screw 57 moves in the protruding direction while rotating by the urging force of the return spring 59, and swings the arm 47 to a position where the roller 52 contacts the base circle 46 a of the cam 46.
- the adjustment screw 57 can be repeatedly initialized. Since the initial setting can be performed simply by screwing the adjusting screw 57 into the nut member 54, the initial setting operation is simple. Further, it is not necessary to provide a through-hole through which the set pin is inserted in the adjusting screw 57 or the nut member 54, so that the cost is low.
- the lash adjuster 41 also injects an initial setting member 28 (see FIGS. 7 and 8) formed by punching a metal plate instead of the initial setting member 25, or an elastic resin.
- An initial set member 32 (see FIGS. 9 and 10) formed by molding can be employed.
- FIG. 13 shows a lash adjuster 71 according to the third embodiment of the present invention. Portions corresponding to the first embodiment are denoted by the same reference numerals and description thereof is omitted.
- the adjusting screw 17 has a projecting end 72 from the nut member 14 formed in a hemispherical shape, and the projecting end 72 is fitted into the recess 24 on the lower surface of the arm 7 to support the arm 7.
- the arm 7 can swing by sliding between the recess 24 and the protruding end 72.
- an axial groove 73 that crosses the male screw 16 from the upper end to the lower end is formed on the outer periphery of the adjustment screw 17, and the male screw 16 is divided by the axial groove 73.
- the axial groove 73 is formed in a U-shaped cross section, and an insertion port 74 is opened between the adjusting screw 17 and the nut member 14.
- the initial setting member 75 is inserted into the insertion port 74 so as to be removable.
- the initial setting member 75 includes an elastic portion 76 inserted into the insertion port 74, a pulling operation portion 77 formed in a ring shape, and a connecting portion 78 that connects the pulling operation portion 77 and the elastic portion 76.
- the initial set member 75 is integrally formed of resin or rubber.
- the elastic portion 76 is formed in a bifurcated shape extending in the opposite direction with respect to the insertion direction, and is sandwiched between the inner surface of the axial groove 73 and the pressure side flank 20 of the female screw. Thus, it is elastically compressed to generate an elastic restoring force in the radial direction. Due to this elastic restoring force, a frictional force is generated between the elastic portion 76 and the adjusting screw 17, and a frictional force is also generated between the elastic portion 76 and the nut member 14, and the adjusting screw 17 is prevented from rotating by the frictional force, The nut member 14 is fixed so as not to protrude.
- the elastic portion 76 is formed with a stopper 79 that contacts the upper end of the nut member 14 when inserted into the insertion port 74. Yes.
- a through-hole 80 penetrating vertically is formed in the bottom portion 18 of the nut member 14.
- an oil drain hole 81 communicating with the through hole 80 is formed on the inner bottom surface of the accommodation hole 13. Therefore, the engine oil that has flowed into the gap between the male screw 16 and the female screw 15 from the upper end surface of the nut member 14 passes through the through hole 80 and the oil drain hole 81 in order, and is discharged from the nut member 14.
- the lash adjuster 71 is incorporated into the valve gear as follows.
- the initial setting member 75 is inserted into the insertion port 74, and the adjustment screw 17 is initially set.
- the lash adjuster 71 is inserted into the accommodation hole 13 and the arm 7 and the camshaft 12 are attached.
- the initial setting member 75 is pulled out from the insertion port 74 by putting a finger or a tool on the pulling operation portion 77.
- the initial setting of the adjusting screw 17 is released, and the adjusting screw 17 moves in the protruding direction while rotating by the urging force of the return spring 19, and the end of the arm 7 is moved to a position where the roller 11 contacts the cam 6. Push up.
- the lash adjuster 71 can initially set the adjustment screw 17 at an arbitrary height by screwing the adjustment screw 17 to an arbitrary height and inserting the initial setting member 75 into the insertion port 74 in that state. . Therefore, when this lash adjuster 71 is used for a plurality of types of valve gears, the adjust screw 17 can be initially set to a height corresponding to each valve gear, which is convenient.
- the engine oil that has flowed into the axial groove 73 from the upper end surface of the nut member 14 enters the gap between the male screw 16 and the female screw 15. Therefore, the lubricity between the male screw 16 and the female screw 15 is excellent, and the male screw 16 and the female screw 15 are not easily worn.
- the lash adjuster 71 is lighter than the case where the initial setting member 75 is formed of metal such as iron because the initial setting member 75 is formed of resin or rubber. Further, the initial setting member 75 is easy to recycle when molded with resin.
- the adjustment screw 17 can be repeatedly initialized. Further, since the initial setting member 75 can be inserted regardless of the screwing position of the adjusting screw 17, it is not necessary to finely adjust the screwing of the adjusting screw 17, and the initial setting operation is simple.
- the elastic portion 76 of the initial setting member 75 is formed in a bifurcated shape, but the elastic portion 76 may be formed in a spherical shape as shown in FIGS. 19 to 21, the elastic portion 76 is formed in a spherical shape that is elastically compressed when inserted into the insertion port 74.
- axial groove 73 In FIG. 15, only one axial groove 73 is formed. However, as shown in FIG. 20, a plurality of axial grooves 73 may be formed at equal intervals in the circumferential direction. If it does in this way, since the external thread 16 and the internal thread 15 will contact symmetrically about an axial center, the adjustment screw 17 is hard to incline during engine operation. Further, when the adjusting screw 17 is formed by forging, the forging can be performed with high accuracy.
- the axial groove 73 is provided on the outer periphery of the adjusting screw 17 in order to open the insertion port 74 between the adjusting screw 17 and the nut member 14, but the nut is changed to the outer periphery of the adjusting screw 17.
- An axial groove may be formed on the inner periphery of the member 14.
- axial grooves may be formed on both the outer periphery of the adjusting screw 17 and the inner periphery of the nut member 14.
- the axial groove 73 has been described as an example of the notch for opening the insertion opening 74.
- a D-cut portion or a two-chamfer formed on the outer periphery of the adjusting screw 17 is described. May be adopted.
- the D-cut portion is a portion having a shape in which the outer periphery of the adjustment screw 17 is cut out along a plane parallel to a plane including the axis of the adjustment screw 17, and the two-chamfered portion is the axis of the adjustment screw 17. Is a portion having a shape in which the outer periphery of the adjusting screw 17 is cut out in two planes parallel to the plane including the.
- a compression coil spring is used as the return spring 19 for urging the adjustment screw 17, but a torsion coil spring may be employed instead of the compression coil spring.
- the male screw 16 and the female screw 15 can employ trapezoidal screws or triangular screws.
- FIG. 22 to 24 show a lash adjuster 91 according to a fourth embodiment of the present invention. Portions corresponding to the second embodiment are denoted by the same reference numerals and description thereof is omitted.
- the return spring 59 is a torsion coil spring.
- the return spring 59 has an upper end inserted into a through-hole 92 formed in the inner bottom surface of the accommodation hole 53 to be prevented from rotating, and a lower end engaged with an engagement hole 93 formed in the adjustment screw 57. Due to the torsional deformation, a rotational force in a direction protruding downward from the nut member 54 is applied to the adjusting screw 57.
- the adjusting screw 57 is urged by the rotational force in a direction protruding downward from the nut member 54. In the adjusting screw 57, the protruding portion 94 from the nut member 54 comes into contact with the upper end of the valve stem 45 and presses the valve stem 45.
- the male screw 56 and the female screw 55 are vertically symmetrical triangular screws. As shown in FIG. 23, an axial groove 95 that crosses the male screw 56 from the upper end to the lower end is formed on the outer periphery of the adjustment screw 57, and the male screw 56 is divided by the axial groove 95. An axial groove 96 that crosses the female screw 55 from the upper end to the lower end is also formed on the inner periphery of the nut member 54, and the female screw 55 is divided by the axial groove 96. As shown in FIG. 24, the axial grooves 95 and 96 are formed in a U-shaped cross section, and an insertion port 97 is opened between the adjusting screw 57 and the nut member 54 in a state of being coincident with each other. . The initial setting member 75 described in the third embodiment is inserted into the insertion port 97 so as to be removable.
- the elastic portion 76 of the initial setting member 75 is sandwiched between the inner surface of the axial groove 95 and the inner surface of the axial groove 96 to be elastically compressed, and is elastic in the radial direction. Resilience is generated. As a result, a frictional force is generated between the elastic portion 76 and the adjusting screw 57, and a frictional force is also generated between the elastic portion 76 and the nut member 54, and the adjusting screw 57 is initially set by the frictional force. .
- both ends of the nut member 54 are open. Therefore, the engine oil that has flowed into the accommodation hole 53 from the through hole 92 flows into the gap between the male screw 56 and the female screw 55 and is discharged from the lower end surface of the nut member 54.
- the lash adjuster 91 is incorporated into the valve gear as follows.
- the initial setting member 75 is inserted into the insertion port 97, and the adjustment screw 57 is initially set.
- the arm 47 and the cam 46 are attached to the valve gear, and then the initial setting member 75 is pulled out from the insertion port 97.
- the initial setting of the adjusting screw 57 is released, and the adjusting screw 57 moves in the protruding direction while rotating by the rotational force of the return spring 59 and presses the upper end of the valve stem 45.
- the adjusting screw 57 is screwed to an arbitrary height so that the axial grooves 95 and 96 are aligned, and in this state, the initial setting member 75 is inserted into the insertion port 97, so that the male screw 56 has a pitch for each pitch. Initial setting at any height is possible. Therefore, when this lash adjuster 91 is incorporated into a plurality of types of valve gears, the adjustment screw 57 can be initially set at a height corresponding to each valve gear, which is convenient.
- the engine oil that has flowed into the axial grooves 95 and 96 enters the gap between the male screw 56 and the female screw 55. Therefore, the lubricity between the male screw 56 and the female screw 55 is excellent, and the male screw 56 and the female screw 55 are not easily worn.
- the lash adjuster 91 fixes the adjustment screw 57 with an initial setting member 75 that is detachably provided, the adjustment screw 57 can be repeatedly initialized.
- the axial grooves 95 and 96 are provided on both the outer periphery of the adjusting screw 57 and the inner periphery of the nut member 54. However, it is sufficient that at least one of the axial grooves 95 and 96 is provided. If a plurality of the axial grooves 95 and 96 are formed so as to be equally spaced in the circumferential direction, the male screw 56 and the female screw 55 contact symmetrically with respect to the axial center during engine operation, so that the adjusting screw 57 is not easily tilted.
- the axial grooves 95 and 96 having a U-shaped cross section are provided on the outer periphery of the adjusting screw 57 and the inner periphery of the nut member 54 as the notches for opening the insertion port 97.
- the insertion port 97 is opened.
- a D-cut portion or a two-chamfered portion may be formed on the outer periphery of the adjusting screw 57.
- the male screw 56 and the female screw 55 may be sawtooth screws or trapezoidal screws.
- FIG. 25 and 26 show a lash adjuster 101 according to the fifth embodiment of the present invention. Portions corresponding to the third embodiment are denoted by the same reference numerals and description thereof is omitted.
- the adjusting screw 17 includes a pivot member 17A that is inserted into the nut member 14 so as to be slidable in the axial direction, and a male screw member 17B that supports an insertion end of the pivot member 17A into the nut member 14 and has a male screw 16 on the outer periphery.
- the spring washer 17C is sandwiched between the pivot member 17A and the male screw member 17B.
- a disc spring washer or a corrugated washer can be used as the spring washer 17C.
- a D-cut portion 102 extending from the protruding portion from the nut member 14 to the insertion end of the nut member 14 is formed on the outer periphery of the pivot member 17A. As shown in FIG. 26, the D-cut portion 102 has an insertion port 74 opened between the pivot member 17 ⁇ / b> A and the nut member 14.
- the return spring 19 applies an axial force in the direction in which the pivot member 17A protrudes from the nut member 14 via the spring seat 22 to the male screw member 17B.
- the adjustment screw 17 is screwed to an arbitrary height, and the initial setting member 75 is inserted into the insertion port 74 in that state, so that the adjustment screw 17 is initially set at an arbitrary height. It is possible to set. Further, since the adjusting screw 17 is fixed by the initial setting member 75 provided so as to be detachable, the adjusting screw 17 can be repeatedly initialized.
- the lash adjuster 101 has excellent lubricity between the male screw 16 and the female screw 15 because the engine oil flows into the nut member 14 from the upper end surface of the nut member 14 through the D-cut portion 102, and the male screw 16 and the female screw 15. 15 is hard to wear.
- the D-cut portion 102 has been described as an example of the notch for opening the insertion opening 74, but a two-chamfered portion or an axial groove may be adopted instead of the D-cut portion 102. Further, a cutout extending downward from the upper end of the nut member 14 may be formed on the inner periphery of the nut member 14.
- the spring washer 17C is used as an elastic member sandwiched between the pivot member 17A and the male screw member 17B.
- another elastic member for example, a compression coil spring
- the spring washer 17C is used instead of the spring washer 17C. Also good.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
1)前記アジャストスクリュは、前記ナット部材からの突出部分にナット部材の内径よりも大きい外径の頭部を有し、前記初期セット部材は、前記アジャストスクリュの頭部とナット部材の間に挟まれる一対のアーム部と、そのアーム部の一端同士を連結する操作つまみ部とからなり、前記アーム部は、アジャストスクリュの頭部とナット部材との間で弾性的に圧縮可能に形成されている。
2)前記アジャストスクリュの外周と前記ナット部材の内周の少なくとも一方に、前記アジャストスクリュとナット部材の間に差し込み口を開口させる切り欠きが設けられ、前記初期セット部材は、前記差し込み口に弾性的に圧縮した状態で差し込まれる。
1a)金属製の線材を曲げて形成され、前記アーム部は、前記線材を波形に曲げて弾性を付与された初期セット部材。
1b)金属製の板材をプレス成形して形成され、前記アーム部は、前記板材を波形に曲げて弾性を付与された初期セット部材。
1c)弾性を有する樹脂を射出成形して形成された初期セット部材。
1)前記ナット部材は、シリンダヘッドの上面に開口した収容穴に挿入され、前記アジャストスクリュは、動弁装置のアームを揺動可能に支持するスイングアーム式動弁装置のラッシュアジャスタ。
2)前記ナット部材は、カムの回転に応じて揺動するアームの下面に開口した収容穴に挿入され、前記アジャストスクリュは、動弁装置のバルブステムを押圧するロッカアーム式動弁装置のラッシュアジャスタ。
2 シリンダヘッド
7、47 アーム
13、53 収容穴
14、54 ナット部材
15 雌ねじ
16 雄ねじ
17、57 アジャストスクリュ
17A ピボット部材
17B 雄ねじ部材
17C ばね座金
19、59 リターンスプリング
23、63 頭部
25、28、32、75 初期セット部材
26,29,33 アーム部
27、30、34 操作つまみ部
31、35 治具挿入穴
45 バルブステム
46 カム
73、95,96 軸方向溝
74、97 差し込み口
77 引き抜き操作部
102 Dカット部
Claims (15)
- 内周に雌ねじ(15)を有するナット部材(14)と、前記雌ねじ(15)にねじ係合する雄ねじ(16)を外周に有するアジャストスクリュ(17)と、そのアジャストスクリュ(17)をナット部材(14)から突出する方向に付勢するリターンスプリング(19)とを有するラッシュアジャスタにおいて、
前記アジャストスクリュ(17)とナット部材(14)の間に挟まれる初期セット部材(25,75)を着脱可能に設け、その初期セット部材(25,75)とアジャストスクリュ(17)の間の摩擦力と、初期セット部材(25,75)とナット部材(14)の間の摩擦力とによって、アジャストスクリュ(17)がナット部材(14)に固定されるようにしたことを特徴とするラッシュアジャスタ。 - 前記アジャストスクリュ(17)は、前記ナット部材(14)からの突出部分にナット部材(14)の内径よりも大きい外径の頭部(23)を有し、前記初期セット部材(25)は、前記アジャストスクリュ(17)の頭部(23)とナット部材(14)の間に挟まれる一対のアーム部(26,26)と、そのアーム部(26,26)の一端同士を連結する操作つまみ部(27)とからなり、前記アーム部(26)は、アジャストスクリュ(17)の頭部(23)とナット部材(14)との間で弾性的に圧縮可能に形成されている請求項1に記載のラッシュアジャスタ。
- 前記初期セット部材(25)は、金属製の線材を曲げて形成され、前記アーム部(26)は、前記線材を波形に曲げて弾性を付与された請求項2に記載のラッシュアジャスタ。
- 前記初期セット部材(28)は、金属製の板材をプレス成形して形成され、前記アーム部(29)は、前記板材を波形に曲げて弾性を付与された請求項2に記載のラッシュアジャスタ。
- 前記初期セット部材(32)が、弾性を有する樹脂を射出成形して形成された請求項2に記載のラッシュアジャスタ。
- 前記操作つまみ部(30)に治具挿入穴(31)を設けた請求項4または5に記載のラッシュアジャスタ。
- 前記アジャストスクリュ(17)の外周と前記ナット部材(14)の内周の少なくとも一方に、前記アジャストスクリュ(17)とナット部材(14)の間に差し込み口(74)を開口させる切り欠き(73)が設けられ、前記初期セット部材(75)は、前記差し込み口(74)に弾性的に圧縮した状態で差し込まれる請求項1に記載のラッシュアジャスタ。
- 前記アジャストスクリュ(17)が、前記ナット部材(14)内に軸方向にスライド可能に挿入されたピボット部材(17A)と、そのピボット部材(17A)のナット部材(14)内への挿入端を支持し、前記雄ねじ(16)を外周に有する雄ねじ部材(17B)と、前記ピボット部材(17A)と雄ねじ部材(17B)の間に挟まれた弾性部材(17C)とからなり、前記切り欠き(102)が、前記ピボット部材(17A)の外周に形成された請求項7に記載のラッシュアジャスタ。
- 前記切り欠きが、前記アジャストスクリュ(57)の外周に形成されたDカット部(102)である請求項7または8に記載のラッシュアジャスタ。
- 前記切り欠きが、前記アジャストスクリュ(17)の外周に形成された2面取り部である請求項7または8に記載のラッシュアジャスタ。
- 前記アジャストスクリュ(17)の外周の雄ねじ(16)を分断するように前記切り欠き(73)が形成され、その切り欠き(73)が周方向に等間隔となるように複数形成された請求項7または8に記載のラッシュアジャスタ。
- 前記初期セット部材(75)に、前記差し込み口(74)から引き抜く際に指をかけることが可能な引き抜き操作部(77)を設けた請求項7から11のいずれかに記載のラッシュアジャスタ。
- 前記初期セット部材(75)が、ゴムまたは樹脂からなる請求項7から12のいずれかに記載のラッシュアジャスタ。
- 前記ナット部材(14)は、シリンダヘッド(2)の上面に開口した収容穴(13)に挿入され、前記アジャストスクリュ(17)は、動弁装置のアーム(7)を揺動可能に支持する請求項1から13のいずれかに記載のラッシュアジャスタ。
- 前記ナット部材(54)は、カム(46)の回転に応じて揺動するアーム(47)の下面に開口した収容穴(53)に挿入され、前記アジャストスクリュ(57)は、動弁装置のバルブステム(45)を押圧する請求項1から13のいずれかに記載のラッシュアジャスタ。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/922,695 US20110017161A1 (en) | 2008-03-27 | 2009-03-18 | Lash adjuster |
DE112009000725T DE112009000725T5 (de) | 2008-03-27 | 2009-03-18 | Spielausgleichsvorrichtung |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008-083362 | 2008-03-27 | ||
JP2008083362A JP2009236007A (ja) | 2008-03-27 | 2008-03-27 | ラッシュアジャスタ |
JP2008-211537 | 2008-08-20 | ||
JP2008211537A JP2010048124A (ja) | 2008-08-20 | 2008-08-20 | ラッシュアジャスタ |
Publications (1)
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WO2009119398A1 true WO2009119398A1 (ja) | 2009-10-01 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2009/055249 WO2009119398A1 (ja) | 2008-03-27 | 2009-03-18 | ラッシュアジャスタ |
Country Status (3)
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US (1) | US20110017161A1 (ja) |
DE (1) | DE112009000725T5 (ja) |
WO (1) | WO2009119398A1 (ja) |
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DE112008003314T5 (de) * | 2007-12-07 | 2010-10-21 | NTN Corporation, Osaka-shi | Spielausgleichsvorrichtung |
JP2011127533A (ja) * | 2009-12-18 | 2011-06-30 | Ntn Corp | アーム式動弁装置 |
US10964226B2 (en) * | 2015-01-19 | 2021-03-30 | The Boeing Company | Instructional assessment system for a vehicle |
GB201612500D0 (en) * | 2016-07-19 | 2016-08-31 | Eaton Srl | Method for valvetrain lash adjustment with extra lost motion stroke and high stiffness lost motion spring |
US11008901B1 (en) | 2019-11-22 | 2021-05-18 | Caterpillar Inc. | Rocker arm assembly with air venting |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07650Y2 (ja) * | 1987-10-13 | 1995-01-11 | エヌティエヌ株式会社 | ラッシュアジャスタ装置 |
JP2007092668A (ja) * | 2005-09-29 | 2007-04-12 | Ntn Corp | アーム式動弁装置 |
WO2009041364A1 (ja) * | 2007-09-26 | 2009-04-02 | Ntn Corporation | ラッシュアジャスタ |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3791355A (en) * | 1972-02-24 | 1974-02-12 | Johnson Products Inc | Mechanical lash adjuster for overhead cam engines |
JP3794836B2 (ja) | 1998-10-05 | 2006-07-12 | Ntn株式会社 | バルブリフタ |
JP4215663B2 (ja) | 2004-03-08 | 2009-01-28 | Ntn株式会社 | バルブクリアランス自動調整装置 |
-
2009
- 2009-03-18 DE DE112009000725T patent/DE112009000725T5/de not_active Withdrawn
- 2009-03-18 US US12/922,695 patent/US20110017161A1/en not_active Abandoned
- 2009-03-18 WO PCT/JP2009/055249 patent/WO2009119398A1/ja active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07650Y2 (ja) * | 1987-10-13 | 1995-01-11 | エヌティエヌ株式会社 | ラッシュアジャスタ装置 |
JP2007092668A (ja) * | 2005-09-29 | 2007-04-12 | Ntn Corp | アーム式動弁装置 |
WO2009041364A1 (ja) * | 2007-09-26 | 2009-04-02 | Ntn Corporation | ラッシュアジャスタ |
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US20110017161A1 (en) | 2011-01-27 |
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