WO2013136508A1 - 機械式ラッシュアジャスタ - Google Patents
機械式ラッシュアジャスタ Download PDFInfo
- Publication number
- WO2013136508A1 WO2013136508A1 PCT/JP2012/056841 JP2012056841W WO2013136508A1 WO 2013136508 A1 WO2013136508 A1 WO 2013136508A1 JP 2012056841 W JP2012056841 W JP 2012056841W WO 2013136508 A1 WO2013136508 A1 WO 2013136508A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- plunger
- screw
- valve
- engaging portion
- axial load
- Prior art date
Links
Images
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
- F01L1/14—Tappets; Push rods
- F01L1/143—Tappets; Push rods for use with overhead camshafts
Definitions
- the present invention relates to a valve clearance (a distance between a cam and a valve stem in a valve mechanism of an internal combustion engine.
- a valve clearance a distance between a cam and a valve stem in a valve mechanism of an internal combustion engine.
- a valve clearance a distance between a cam and a valve stem in a valve mechanism of an internal combustion engine.
- a valve clearance a distance between a cam and a valve stem in a valve mechanism of an internal combustion engine.
- a valve clearance a distance between a cam and a valve stem in a valve mechanism of an internal combustion engine.
- the rocker arm connected to the valve stem is configured to swing around the mechanical lash adjuster. It is widely known that the valve clearance is automatically adjusted by driving (extension / contraction operation) of a mechanical lash adjuster (for example, see Patent Documents 1 and 2 and Non-Patent Document 1).
- a lower part of a pivot member having a male screw formed on the outer side is accommodated in a cylindrical housing having a female screw formed on the inner side, and pivoted by a plunger spring (compression coil spring) accommodated in the housing.
- a plunger spring compression coil spring
- the conventional mechanical lash adjuster can operate in the direction that decreases the valve clearance (the direction in which the pivot member extends) when the valve clearance increases, but the valve clearance decreases when the valve clearance decreases.
- the valve clearance decreases when the valve clearance decreases.
- FIG. 9 is an enlarged view showing the shape of the male screw (sawtooth screw) of the pivot member constituting the conventional mechanical lash adjuster, but the lead angle of the “thread” of the male screw of the pivot member ⁇ ′ is set to a predetermined angle at which the screw engaging portion can slide and rotate with respect to an axial load acting in either of the pivot member reduction direction (downward in FIG. 9) or the extension direction (upward in FIG. 9). ing.
- the upper flank angle ⁇ 2 is also set to a predetermined angle (for example, 15 degrees) that allows the screw engaging portion to slide and rotate with respect to the axial load in the extending direction of the pivot member in combination with the lead angle ⁇ ′ of the thread.
- the lower flank angle ⁇ 1 is combined with the lead angle ⁇ ′ of the thread and is a predetermined angle (where the screw is self-supporting) due to the friction torque generated in the screw engaging portion with respect to the axial load in the pivot member reduction direction. For example, it is set to 75 degrees.
- the pivot member can slide and rotate at the screw engaging portion by the spring force of the plunger spring and move in the extending direction (direction to decrease the valve clearance), but the valve clearance decreases.
- the pivot member because of the large frictional torque generated in the screw engaging portion, the pivot member cannot slide and rotate in the screw engaging portion, and cannot move in the reduction direction (direction in which the valve clearance is increased).
- the lash adjuster adjusts due to the difference in thermal expansion coefficient between the cylinder head (aluminum alloy) and the valve (iron alloy). May be in a state where the valve clearance is too small (minus), and the face surface of the valve may float from the valve seat. Further, when the valve seat surface is worn, the same thing occurs (the valve clearance becomes excessive and the valve face surface is lifted from the valve seat).
- the conventional lash adjuster cannot operate in the direction in which the pivot member shrinks (in the direction to increase the valve clearance). ) Is restarted, the valve lift amount may be excessive, or the sealing performance between the valve face and the valve seat (sealability of the combustion chamber) may be poor.
- the inventor replaces the conventional “sawtooth screw” in which the screw is self-supported by the friction torque generated in the screw engaging portion constituted by the male screw and the female screw, and performs sliding rotation in the screw engaging portion.
- the friction torque generated on the sliding contact surface with the axial load transmission member such as the rocker arm of the pivot member other than the screw engaging portion of the pivot member could be used.
- the screw engaging portion slides and rotates without “self-standing of the screw”, but the axial load transmission member (for example, The friction torque generated on the sliding contact surface with the rocker arm) suppresses the sliding rotation of the screw engaging portion (hereinafter referred to as “the screw engaging portion becomes relatively immobile”).
- the screw engagement portion becomes relatively stationary (the pivot member is stationary in the axial direction) )
- the lash adjuster functions (acts) as a fulcrum for the rocker arm to swing (the valve opens and closes) in conjunction with the rotation of the camshaft, and the screw engaging portion is relatively stationary. Except Of course, it works in the direction in which the pivot member extends (in the direction to decrease the valve clearance), but also in the direction in which the pivot member shrinks (in the direction to increase the valve clearance), which did not work in the conventional structure. Thought.
- the thrust torque is larger than the sum of the first and second friction torques, the screw engaging portion slides and rotates, and conversely, the thrust torque is less than the sum of the first and second friction torques. Further, the sliding rotation of the screw engaging portion is prevented.
- the lead angle and flank angle of the thread of the “screw” that constitutes the screw engagement portion so that the screw engagement portion can slide and rotate when an axial load in either the expansion or contraction direction is applied to the pivot member. Since the first friction torque can be neglected, the state in which the screw engaging portion can slide and the state in which sliding rotation is prevented (screw screw) can be determined only by the magnitude relationship between the thrust torque and the second friction torque.
- the engaging portion is relatively stationary). That is, it was considered that the lead angle and the flank angle at which the screw engaging portion is relatively stationary with thrust torque ⁇ second friction torque may be set.
- the inventor made a prototype of a mechanical lash adjuster and verified its effect, and as a result, it was confirmed that the mechanical lash adjuster was effective.
- the present invention has been made in view of the above-described problems of the prior art, and an object thereof is to provide a mechanical lash adjuster having a completely different structure from that of the prior art, which can automatically adjust the valve clearance.
- the valve is urged in the valve closing direction by a valve spring and a cam serving as a valve mechanism constituting member is interposed between the shaft end.
- the lash adjuster includes a plunger in which the pressing force of the cam acts as an axial load, a plunger engaging member that is engaged in the axial direction via the plunger and the screw engaging portion and is held so as not to rotate in the circumferential direction, A plunger spring that urges the plunger in the direction opposite to the direction in which the urging force of the valve spring acts, Even when an axial load in either the expansion or contraction direction acts on the plunger, the screw engagement portion slides and rotates, and the plunger can move in the axial load application direction.
- the screw of the “screw” constituting the screw engaging portion so that the sliding rotation of the screw engaging portion is suppressed by the friction torque generated on the sliding contact surface of the screw so that the screw engaging portion is relatively stationary. It was configured to set the lead angle and flank angle of the mountain.
- the mechanical lash adjuster has a rocker arm type valve operating mechanism specification that is indirectly interposed between the valve shaft end and the cam, and is directly interposed between the valve shaft end and the cam. There is a direct acting valve mechanism specification.
- the former (the lash adjuster of the rocker arm type valve operating mechanism specification) is configured so that the cam pressing force and the urging force of the valve spring act on the lash adjuster (plunger) via the rocker arm.
- the latter (the lash adjuster of the direct acting valve mechanism specification) has a structure in which the cam pressing force and the urging force of the valve spring are lash adjusters. (The plunger and the plunger engaging member) are directly interposed between the shaft end of the valve and the cam.
- first structure and second structure are provided depending on whether the male screw (female screw) constituting the screw engaging portion is formed on the plunger or the plunger engaging member. Conceivable.
- a female housing is formed on the inner side, and a cylindrical housing that is a plunger engaging member that is held so as not to rotate in the circumferential direction, and a male screw that engages with the female screw Is formed on the outside, and includes a plunger that is screw-engaged with the housing in the axial direction, and a plunger spring that is loaded in the housing and biases the plunger in a direction opposite to the direction in which the valve spring is biased.
- a first structure (see FIGS. 1, 6 and 8) is conceivable.
- a male screw is formed on the outer side, a rod member that is a plunger engaging member held so as not to rotate in the circumferential direction, and a female screw that engages with the male screw is formed on the inner side.
- a plunger that is screw-engaged with the rod member in the axial direction; and a plunger spring that is interposed between the rod member and the plunger and biases the plunger in a direction opposite to the direction in which the valve spring is biased.
- a second structure provided is conceivable.
- the axial load transmission member for example, the rocker arm in the rocker arm type valve mechanism, the valve shaft end side in the direct acting valve mechanism
- the screw engaging portion slides and the plunger can move in the axial load application direction.
- the friction torque (first friction torque) generated in the screw engaging portion between the housings 22 and 122; the rod member 114 can be ignored.
- the lift amount of the valve gradually increases from 0 (valve closed state), gradually decreases after reaching the maximum value (valve open state), and becomes 0 (valve closed state).
- the thrust torque TF ⁇ braking torque TB, threaded engagement portion is relatively immovable state (the plunger comes to rest in the axial direction).
- the lash adjuster (the plunger thereof) functions (acts) as a fulcrum for rocking the rocker arm (opening / closing the valve) in conjunction with the rotation of the camshaft.
- brake torque TB ⁇ thrust torque TF the screw engagement portion slides and rotates, and the plunger can move in the axial load acting direction.
- valve clearance increase state is canceled by moving in the direction in which the plunger extends.
- valve clearance reduction state when the valve clearance decreases, the direction in which the plunger increases the valve clearance when the valve opens and closes (for example, when the cam pressing force acts on the plunger as an axial load near the maximum value) The valve clearance reduction state is resolved.
- the lash adjuster adjusts due to the difference in thermal expansion coefficient between the cylinder head (aluminum alloy) and the valve (iron alloy). May be in a minus state where the valve clearance is too small, and the face of the valve may float from the valve seat when the engine (engine) is restarted. Further, when the valve seat surface is worn, the same thing occurs (the valve clearance becomes too small and the valve face lifts from the valve seat when the engine is restarted).
- the lash adjuster when the valve is opened when the engine is restarted (for example, when the cam pressing force acts on the plunger as an axial load close to the maximum value), Moves in the direction that increases the valve clearance (the direction in which the plunger shrinks), and the excessive valve clearance (minus) state is resolved. Therefore, when the engine is restarted when the engine is cold, the valve lift amount becomes excessive. There is no problem that the sealing performance between the face face of the valve and the valve seat (sealability of the combustion chamber) becomes poor.
- the angle of the thread of the “screw” constituting the screw engaging portion is set to a lead angle of 10 to 40 degrees and a flank angle of 5 to 45.
- the range of degrees was set.
- any of a trapezoidal screw and a triangular screw may be used as the “screw” constituting the screw engaging portion, that is, the male screw (female screw). Further, it may be an “equal flank screw” in which the upper flank and the lower flank have the same angle, or an “unequal flank screw” in which the upper flank and the lower flank have different angles.
- the lead angle of the thread of the “screw” constituting the screw engaging portion can be smoothly slid and rotated even when an axial load in either the expansion or contraction direction acts on the plunger.
- the sliding rotation of the screw engaging portion can be suppressed (the screw engaging portion is relatively immovable) by the frictional torque generated on the sliding contact surface of the plunger with the axial load transmission member.
- a range is desirable. Specifically, when the friction torque generated on the sliding contact surface of the plunger mainly with the axial load transmission member is relatively large (small) with respect to a predetermined axial load acting on the plunger, a small (large) lead angle is set. As set, a lead angle having a magnitude corresponding to the friction torque generated on the sliding contact surface of the plunger mainly with the shaft load transmission member is set.
- flank angle is less than 5 degrees
- the friction angle is small due to the category of a square screw, so the significance of changing the flank angle is lost, and high-precision machining that is not affected by lead errors is difficult.
- flank angle exceeds 45 degrees, it is easy to process the “screw”, but the friction angle is very large, so even if the lead angle is changed, the “screw” is very self-supporting, so the flank angle is adjusted. Useless as a parameter is lost.
- the lead angle is set according to the magnitude of the friction torque generated on the sliding contact surface of the plunger mainly with the shaft load transmission member.
- the flank angle is set. If the flank angle is large (small), the screw engaging part is slippery (difficult), so the timing and sliding property of the screw engaging part are finely adjusted. In order to achieve this, an appropriate flank angle is set.
- the "screw" constituting the screw engaging portion is constituted by a multi-thread screw.
- the pitch can be increased.
- the lead angle of the “screw” that constitutes the screw engaging portion is “the screw engaging portion slides and rotates even when an axial load in either the expansion or contraction direction acts on the plunger.
- the surface pressure generated in the screw engaging portion decreases, and the “screw” is less likely to wear.
- the screw engagement portion slides and rotates during the valve opening / closing operation, regardless of whether the valve clearance increases or decreases. Since the plunger moves in a direction to cancel the change in the valve clearance, the valve clearance can be automatically and reliably adjusted.
- the lead angle and the flank angle of the thread of the “screw” constituting the screw engaging portion are set to an angle corresponding to the friction torque generated on the sliding contact surface with the shaft load transmission member of the plunger.
- the setting range of desirable angles (lead angle and flank angle) of the thread is expanded, and mechanical types having different thrust torque characteristics and brake torque characteristics are obtained.
- Rush adjusters can be provided.
- FIG. 1 is a cross-sectional view of an entire rocker arm type valve mechanism, showing a first embodiment in which the present invention is applied to a mechanical lash adjuster of a rocker arm type valve mechanism.
- the principal part of the mechanical lash adjuster which concerns on 1st Example is shown, (a) is a figure which shows the lead angle and flank angle of the thread of the external thread formed in the plunger, (b) is the internal thread formed in the housing It is a figure which shows the lead angle and flank angle of this thread.
- (A) is a figure which shows the thrust torque (thrust torque which acts on a plunger) generate
- (b) is the brake torque (brake torque which acts on a plunger) which suppresses the sliding rotation of a screw engaging part
- (C) is a figure which shows the mode of the change of the thrust torque with respect to an axial load, and a brake torque. It is a figure which shows the valve lift amount, axial load, and plunger movement when the engine speed is low. It is a figure which shows the valve lift amount, axial load, and plunger movement when the engine speed is high. It is a longitudinal cross-sectional view of the mechanical lash adjuster of the direct acting type valve operating mechanism specification which is the 2nd Example of this invention.
- reference numeral 10 denotes an intake valve (exhaust valve) disposed across the intake (exhaust) port P provided in the cylinder head 11.
- a cotter 12a and a spring retainer 12b are mounted on the outer periphery.
- a valve spring 14 is interposed between the spring seat surface 11a and the spring retainer 12b, and the valve 10 is urged in the valve closing direction (upward in FIG. 1).
- Reference numeral 11b denotes a cylindrical valve sliding guide
- reference numeral 10a denotes a face surface formed on the outer periphery of the umbrella portion of the valve 10
- reference numeral 11c denotes a peripheral edge portion of the intake (exhaust) port P to the combustion chamber S. This is a valve seat.
- Reference numeral 16 denotes a rocker arm, one end of which is in contact with the shaft end of the valve 10, and a socket 18 formed on the other end is engaged with a pivot 24 a at the tip of the plunger 24 of the mechanical lash adjuster 20. .
- a roller 17b supported by a roller shaft 17a is provided, and a cam 19a provided on the camshaft 19 is in contact with the roller 17b.
- the mechanical lash adjuster 20 is inserted into a vertically extending bore 13 provided in the cylinder head 11 and has a cylindrical housing 22 which is a plunger engaging member having an internal thread 23 formed on the inside, and an external thread 25 on the outside.
- a plunger 24 formed in the housing 22 so that the male screw 25 engages with the female screw 23, and a direction in which the plunger 24 is extended from the housing 22 by being loaded in the housing 22 (upward direction in FIG. 1)
- a plunger spring 26 for urging the spring.
- Reference numeral 27 a is a disc-shaped spring seat plate accommodated on the lower end side in the housing 22, and reference symbol 27 b is a C-ring that fixes the spring seat plate 27 a to the housing 22.
- the plunger 24 in which the pressing force of the cam 19a acts as an axial load and the housing 22 which is a plunger engaging member held so as not to rotate in the circumferential direction are connected to the screw engaging portion (the male screw 25 on the plunger 24 side and the housing). It is engaged in the axial direction via a female screw 23) on the 22 side.
- the housing 22 is inserted into the bore 13 so that the lower end of the housing 22 is in contact with the bottom surface of the bore 13, but is not press-fitted into the bore 13 (no positive housing detent means is provided). However, the friction torque generated between the lower end of the housing 22 and the bottom surface of the bore 13 prevents the rotation of the housing 22 with respect to the bore 13 when the axial load in the direction of pushing down the plunger 24 via the rocker arm 16 acts on the plunger 24. To do. That is, the housing 22 is held so as not to rotate with respect to the bore 13 due to friction torque generated between the housing 13 and the bottom surface of the bore 13.
- the male screw 25 on the plunger 24 side (the female screw 23 on the housing 22 side) constituting the screw engaging portion between the plunger 24 and the housing 22 is respectively shown in FIG.
- the lead angle ⁇ of the thread of the male screw 23 is, for example, 30 degrees
- the upper flank angle ⁇ 25a ( ⁇ 23a) of the thread of the male screw 25 on the plunger 24 side is 30 degrees, for example.
- the lower flank angle ⁇ 25b ( ⁇ 23b) is set to, for example, 30 degrees, and the plunger 24 slides and rotates in the screw engaging portion even when an axial load in either the expansion or contraction direction acts on the plunger 24.
- the lash adjuster 20 can move the plunger 24 in the load application direction by sliding and rotating at the screw engaging portion even when an axial load in either the expansion or contraction direction is applied to the plunger 24.
- the sum of the friction torques generated on the contact surface F2 and the sliding contact surface F3 of the plunger 24 causes the screw engagement portion to slide and rotate by the axial load acting on the plunger 24.
- the thrust torque is exceeded, the sliding rotation of the screw engaging portion is suppressed (the screw engaging portion is stationary), and the pivot portion 24a at the tip of the plunger 24 is linked to the rotation of the camshaft 19.
- the screw engaging portion between the male screw 25 and the female screw 23 of the housing 22 generates a thrust torque TF for slidingly rotating the screw engaging portion and a first friction torque for suppressing the sliding rotation.
- the sliding of the screw engaging portion on the sliding contact surface F2 of the plunger 24 with the rocker arm 16 (sliding contact surface with the socket 18 of the pivot portion 24a) F2 and the sliding contact surface F3 of the plunger 24 with the plunger spring 26 also occurs. Second and third friction torques are generated to suppress rotation.
- the screw engaging portion slides and rotates even when an axial load in either the expansion or contraction direction is applied to the plunger 24, and the plunger 24 can move in the axial load application direction.
- the thrust torque TF that attempts to slide and rotate the screw engaging portion is the sum of the thrust torques TFbs and TFps generated by the reaction force (biasing force) of the valve spring 14 and the reaction force (biasing force) of the plunger spring 26, respectively.
- it is proportional to the axial load W.
- the brake torque TB for suppressing the sliding rotation of the screw engaging portion is generated on the sliding contact surface F2 of the plunger 24 (the pivot portion 24a) with the rocker arm 16 and the sliding contact surface F3 of the plunger 24 with the plunger spring 26, respectively.
- the sum of the second and third friction torques (TB TB2 + TB3), which is proportional to the axial load W as shown in FIG.
- the third friction torque TB3 is a friction torque generated by the reaction force (biasing force) of the plunger spring 26, but the reaction force (biasing force) of the plunger spring 26 having a small spring constant is the reaction force of the valve spring 14. Since it is smaller than the force (biasing force), it is not proportional to the axial load W as in the second friction torque TB2, and is almost constant even if the axial load W increases (see FIG. 3B).
- the thrust torque TF and brake torque TB acting on the plunger 24 during the opening / closing operation of the valve 10 are shown in FIG. 3 (c) with the axial load W acting on the plunger 24 as the horizontal axis and the torque acting on the plunger 24 as the vertical axis. ) In straight lines TF, TB (+), TB ( ⁇ ).
- the thrust torque TF acting on the plunger 24 during the valve opening operation of the valve 10 is shown by a straight line that increases from the negative (minimum value) to the positive (maximum value) upward as the axial load W increases.
- the thrust torque TF acting on the plunger 24 during the closing operation of the valve 10 can be represented by a straight line that decreases from positive (maximum value) to negative (minimum value) downward.
- the thrust torque TF has a correlation with the lead angle and flank angle of the screw. For example, when the lead angle increases (lead angle rises) or the flank angle decreases (triangular screw ⁇ trapezoidal screw ⁇ square screw).
- the thrust torque TF characteristic slopes steeply, conversely, the lead angle decreases (lead angle lies down), and the flank angle increases (square screw ⁇ trapezoidal screw ⁇ triangular screw). The slope of the TF characteristic (straight line) becomes gentle.
- FIG. 3C which shows changes in the thrust torque TF and the brake torque TB with respect to the axial load W acting on the plunger 24, the axial load acting on the plunger 24 when the cam 19 a rotates once (the valve 10 opens and closes).
- the lash adjuster 10 can adjust the valve clearance to zero when the valve 10 operates in either the valve opening direction or the valve closing direction. Recognize.
- the cam 19a starts pushing the rocker arm, the valve lifts to some extent.
- the thrust torque TF coincides with the brake torque TB ( ⁇ )
- the absolute value of the brake torque TB ( ⁇ ) ⁇ the absolute value of the thrust torque TF.
- the plunger 24 can move in the extending direction (upward direction in FIG. 1), which is the direction in which the axial load (reaction force of the plunger spring 26) acts (state (1) in FIG. 3C).
- the brake torque TB (until the lift amount reaches the maximum, for example, the right end in FIG. 3C). Since the absolute value of (+) ⁇ the absolute value of the thrust torque TF, the screw engaging portion slides and rotates, and the plunger 24 can move in the contraction direction, which is the direction of the axial load (the pressing force of the cam 19a) (FIG. 3 ( c) (3) state).
- the thrust torque TF and the brake torque TB acting on the plunger 24 during the valve opening operation are not affected by the cam pressing force on the plunger 24 but only the urging force of the plunger spring 26 (FIG. 3C).
- the state (1) is shifted to the state (2) (the state (2) -1 ⁇ the state (2) -2) ⁇ the state (3).
- the operation shifts to a valve closing operation in which the axial load gradually decreases.
- the thrust torque TF and the brake torque TB acting on the plunger 24 during the valve closing operation are the plunger 24 (3) state in Fig. 3 (c) ⁇ (2) state ((2) -2 state ⁇ (2) -1 ⁇ state) ⁇ (1)
- the state sequentially shifts to the state of (2) again.
- P2 is an intersection of the thrust torque straight line TF and the friction torque straight line TB ( ⁇ ).
- P4-1 is an intersection of the thrust torque straight line TF and the friction torque straight line TB (+) in FIG. 3C, and the axial load acting on the plunger 24 increases (decreases).
- the area (2) is switched to the area (3) (the area (3) to the area (2)).
- the axial load indicated by the horizontal axis in FIG. 3C is once the maximum lift amount (Max Lift). After rising to the position, it begins to drop when the lift amount exceeds the maximum lift (Max Lift) position, so the relationship between torque and shaft load now advances to the left on the thrust torque line TF.
- the range from the P4-1 position to the P4-2 position including this maximum axial load position is the state indicated by P4 in FIG.
- the region (3) is switched to the region (2). It becomes a state. Further, when the lift amount decreases and the axial load decreases, the thrust torque TF continues to decrease in the left direction. When the thrust torque straight line TF passes through the intersection P2 with the friction torque straight line TB ( ⁇ ), the state of P6 in FIG. become.
- valve clearance increases, the plunger 24 slides and rotates at the screw engaging portion in the state of (1) where the absolute value of the brake torque TB ( ⁇ ) ⁇ the absolute value of the thrust torque TF.
- the increase in valve clearance is eliminated (adjusted).
- valve clearance decreases
- the plunger 24 slides and rotates at the screw engaging portion in the state (3) where the absolute value of the brake torque TB (+) ⁇ the absolute value of the thrust torque TF (3). Move in the direction (valve clearance increasing direction) to eliminate (adjust) the decrease in valve clearance.
- 4A, 4B, and 4C are diagrams showing valve lift amount, shaft load, and plunger movement when the engine speed is low (for example, less than 3000 rpm).
- the operation of the mechanical lash adjuster 20 when the cam 19a rotates will be described in more detail with reference to FIG.
- the plunger 24 receives the pressing force by the cam 19a. Only a predetermined reaction force (biasing force) of the plunger spring 26 acts as an axial load in the plunger extending direction without acting as a load.
- valve clearance between the rocker arm and the valve shaft end portion increases, when the contact point between the rocker arm 16 (the roller 17b) and the cam 19a is on the base circle of the cam 19a, the plunger 24 Moving in the extension direction (valve clearance decreasing direction), the plunger 24 pushes up the rocker arm 16, the other end of the rocker arm 16 is lowered, and the valve clearance is adjusted to zero.
- the screw engaging portion tries to slide and rotate by a force for pushing down the plunger 24 (downward axial load from the rocker arm 16), but the sliding contact surface F2 of the plunger 24 with the rocker arm 16 and the plunger spring 26 of the plunger 24
- the frictional force (second and third frictional force) generated on the sliding contact surface F3 with the shaft generates rotation in a direction to push down the plunger 24 (the axial load transmitted from the rocker arm 16 is thrust torque TF by the screw engaging portion. To be converted).
- the plunger 24 moves in the axial load acting direction (lower side in FIG. 1). After moving linearly in the direction) by the backlash of the screw engaging portion, it stops when the lower flank of the male screw 25 of the plunger 24 and the upper flank of the female screw 23 of the housing 22 are in contact (the state (2) continues. To do).
- the cam 19 further rotates, and the plunger 24 generated at the screw engaging portion is rotated until the contact point between the rocker arm 16 and the cam 19 exceeds Max Lift (indicated by reference numeral P4-2 in FIG. 4). Since the thrust torque TF to be exceeded exceeds the brake torque TB due to the frictional force generated on the sliding contact surfaces F2 and F3 (TB ⁇ TF), the plunger 24 can move in the axial load acting direction (state (3)). Will continue.
- the plunger 24 can move in the axial load acting direction (brake torque TB ⁇ thrust force). Torque TF), the plunger 24 slightly moves in the reduction direction with respect to the original Max Lift of the cam 19a, resulting in a reduction in lift amount (lift loss ⁇ ). That is, the lift loss ⁇ is generated by reducing the lift amount by an amount corresponding to the amount by which the plunger 24 moves in the reduction direction, rather than the lift amount to be moved by the pressing force of the cam 19a.
- the plunger 24 is as described in (1). In this state, after moving in the extending direction by the valve clearance, the upper flank of the male screw 25 of the plunger 24 and the lower flank of the female screw 23 of the housing 22 are in contact with each other (from the state (1) to (2) State).
- the plunger 24 when the valve clearance increases in the valve operating mechanism, first, only the urging force of the plunger spring 26 immediately before the valve lift of the valve opening / closing operation is applied to the plunger 24.
- the plunger 24 When acting as an axial load (indicated by symbol P6 in FIG. 4), the plunger 24 moves in the direction of decreasing the valve clearance (the direction in which the plunger 24 extends), and the increased valve clearance state is eliminated.
- the adjustment state by the lash adjuster 20 is caused by the difference in thermal expansion coefficient between the cylinder head 11 and the valve 10. Since the clearance is too small (minus), the face surface 10a of the valve 10 may float from the valve seat 11b when the engine (engine) is restarted. Further, when the valve seat surface 10a is worn, the same thing occurs (the valve clearance becomes too small, and the face surface 10a of the valve 10 is lifted from the valve seat 11c when the engine is restarted).
- the lash adjuster 20 when the pressing force of the cam 19a acts on the plunger 24 as an axial load near the maximum value in the valve opening / closing operation (indicated by reference numeral P4 in FIG. 4). Since the plunger 24 moves in the direction in which the valve clearance is increased (the direction in which the plunger 24 is reduced) in a state where the brake torque TB ⁇ the thrust torque TF), the valve clearance excessively (minus) state is eliminated. When restarting the engine when it is cold, the valve lift amount becomes excessive, or the sealing performance between the face surface 10a of the valve 10 and the valve seat 11c (sealability of the combustion chamber) becomes poor. Absent.
- 5 (a), 5 (b), and 5 (c) are diagrams showing valve lift amount, shaft load, and plunger movement when the engine speed is high (for example, 3000 rpm or more).
- the axial load due to the reaction force (biasing force) of the valve spring 14 is not dominant as in the case of low engine rotation shown in FIG. 4, and the rocker arm 16 and the valve 10 that mainly constitute the valve operating system, etc.
- Inertial force becomes dominant (strongly affected by the inertial force of the valve train).
- the timing in which the maximum axial load acts on the plunger 24 of the lash adjuster 20 is at the time of Max Lift when the engine is low, whereas at the time of high engine rotation, as shown in FIG. It is when the valve starts to open and when it closes.
- the movement of the plunger 24 at this time is the same as the state (3) in which the axial load suddenly rises when the valve lift starts, and the plunger 24 slightly moves in the reduction direction to reduce the lift amount (lift loss ⁇ ).
- the reaction force (biasing force) of the valve spring 14 almost disappears through the state (2) that is almost negligible (characteristically not manifested), and mainly a predetermined reaction force (biasing force) of the plunger spring 26. ) Only acts as an axial load, and the plunger 24 is pushed up by the amount that the plunger 24 moves in the contracting direction in the state (3), and the valve clearance is adjusted (2). Return to the state.
- the mechanical lash adjuster 20 of the rocker arm type valve operating mechanism specification is shown, but in the second embodiment, the mechanical lash adjuster 20A of the direct acting type valve operating mechanism specification is shown.
- Reference numeral 10 denotes an intake valve (exhaust valve) disposed so as to cross an intake (exhaust) port (see reference numeral P in FIG. 1) provided in the cylinder head 11, and a cotter 12a and A spring retainer 12b is mounted, and a valve spring 14 is interposed between the spring seat surface (see reference numeral 11a in FIG. 1) and the spring retainer 12b, and the valve 10 is biased in the valve closing direction (upward in FIG. 6).
- intake valve exhaust valve
- a cam 19a provided on the camshaft 19 is disposed directly above the valve 10. Between the cam 19a and the shaft end (the cotter 12a) of the valve 10, there is an upper and lower provided on the cylinder head 11. A mechanical lash adjuster 20A inserted in the extending bore 13 is interposed.
- the mechanical lash adjuster 20 ⁇ / b> A is engaged with a bore 13 provided in the cylinder head 11 and has a cylindrical bucket 110 that opens downward, and an internal thread 23 formed inside, and is fixed and integrated on the bottom surface of the ceiling of the bucket 110.
- a cylindrical housing 122 that is a plunger engaging member, and a cup type that is disposed in the housing 122 by engaging a male screw 25 formed on the outside with a female screw 23 on the housing 122 side and that opens upward.
- the plunger 124 and the direction in which the plunger 124 extends from the housing 122 (the downward direction of FIG. 6, the direction in which the biasing force of the valve spring 14 acts) is interposed between the plunger 124 and the ceiling of the bucket 110.
- a plunger spring 26 urging in the opposite direction).
- a partition 111 extending in a disk shape is integrated inside the bucket 110, and a vertical cylindrical portion 112 formed at the center of the partition 111 is fixed and integrated on the outer periphery of the housing 122, so that the bucket 110 and the housing 122 are integrated. Mounting strength is secured.
- the bucket 110 is held so as not to rotate circumferentially with respect to the bore 13 by a non-rotating means (not shown), and the bucket 110 (lash adjuster 20A) is connected to the rotation of the cam 19a. It slides only in the axial direction.
- the lower end surface of the plunger 124 comes into contact with the upper end surface of the cotter 12a which is an axial load transmitting member mounted on the shaft end portion of the valve 10, so that the area of the sliding contact surface F4 of the plunger 124 with the valve 10 is increased.
- the second friction torque generated on the sliding contact surface F4 is increased so as to increase.
- the thread angle (lead angle and flank angle) of the male screw 25 of the plunger 124 (the female screw 23 of the housing 122) is set so that the male screw 23 of the plunger 24 (the female screw of the housing 22) in the lash adjuster 20 of the first embodiment described above. 23) is set to the same angle as the thread angle (lead angle and flank angle) (for example, the lead angle is 30 degrees and the flank angle is 30 degrees).
- the mechanical lash adjuster 20B shown in FIG. 7 is a mechanical lash adjuster having a direct acting valve operating mechanism specification, as in the second embodiment.
- the internal thread 23 formed on the inner periphery of the housing 122 integrated with the bucket 110 and the external thread 25 formed on the outer periphery of the cup-type plunger 124 are engaged in the axial direction. It is arranged to do.
- a rod member 114 which is a plunger engaging member extending downward on the top of the bucket 110, is integrally formed, and a male screw 25 is provided on the outer periphery of the rod member 114.
- an internal thread 23 is formed on the inner periphery of the peripheral wall of the cup-shaped plunger 124 that opens upward, and the external thread 25 of the rod member 114 and the internal thread 23 of the plunger 124 are engaged in the axial direction.
- the plunger 124 is formed with a flange-shaped spring receiver 125, and a plunger spring 26 is interposed between the spring receiver 125 and the ceiling of the bucket 110, so that the plunger 124 is in sliding contact with the plunger spring 126.
- the surface F5 is constituted by the spring receiver 125.
- the spring force of the plunger spring 126 is increased to generate the sliding contact surface F4.
- the choice of spring characteristics can be expanded, for example, the friction torque to be set can be set larger, and for example, the axial size can be made more compact than in the second embodiment.
- the mechanical lash adjuster 20C shown in FIG. 8 is of the rocker arm type valve operating mechanism specification as in the first embodiment, but the plunger 24A disposed in the housing 22 is a plunger in which a male screw 25 is formed.
- the structure is divided into a base end portion 24A1 and a plunger tip end portion 24A2 in which a pivot 24a is formed.
- the housing 22 is held so as not to rotate in the circumferential direction by the friction torque generated between the lower end of the housing 22 and the bottom surface of the bore 13 as in the first embodiment.
- the plunger base end portion 24 ⁇ / b> A ⁇ b> 1 is configured in a cup shape that opens downward and has a male screw 25 that engages with the female screw 23 on the housing 22 side.
- the male screw 25 and the female screw 23 are composed of triangular screws with equal flank angles, and the angle of the thread of the male screw 25 (female screw 23) constituting the screw engaging portion is the first, second, and third described above.
- the lead angle is set to 30 degrees, for example, and the flank angles (upper flank angle and lower flank angle) are set to 30 degrees, for example.
- a plunger spring 26 is interposed between the ceiling inner surface 24A1a of the plunger base end portion 24A1 and the inner bottom surface 22a of the housing 22 to urge the plunger base end portion 24A1 upward.
- the plunger tip portion 24A2 is configured in a cylindrical shape that opens downward with a pivot portion 24a formed at the upper end portion, and a step portion 24A2a provided on the outer periphery of the plunger tip portion 24A2 is mounted on the upper end opening portion of the housing 22.
- the inner cap is engaged with the inner peripheral edge of the annular cap 28 and is prevented from coming off.
- the plunger spring 26 holds the plunger base end portion 24A1 and the plunger distal end portion 24A2 in a pressure contact state in the axial direction, and the plunger 24A (plunger distal end portion 24A2) protrudes upward from the housing 22 (extension direction). It is kept biased.
- the thrust torque TF is generated, and the plunger 24A sliding contact surface with the rocker arm 16 (sliding contact surface with the socket 18 of the pivot portion 24a) F6, the plunger distal end portion 24A2 (the upper end surface 24A1b of the plunger distal end portion 24A2) The sliding contact surface F7 with the lower end surface 24A2b) and the sliding contact surface F8 with the plunger spring 26 at the plunger base end portion 24A1 (the top inner surface 24A1a) try to suppress the sliding rotation of the screw engaging portion. Friction torque (brake torque) TB6, TB7, TB8 is generated .
- the lead angle of the screw thread of the male screw 25 (the female screw 23 of the housing 22) of the plunger base end portion 24A1 is, for example, 30 degrees, and the upper side (lower side) of the screw thread of the male screw 25 (female screw 23).
- the plunger 24A (plunger base end 24A1)
- the plunger can be moved in the axial load acting direction while sliding and rotating in the screw engaging portion, and the friction torque (brake torque) TB6, TB7, TB8 generated on the sliding contact surface F6, the sliding contact surface F7, and the sliding contact surface F8, respectively.
- Slip rotation of the screw engaging portion of 24A (plunger base end portion 24A1) is suppressed, and the screw engaging portion is relatively It is configured to be immobile (the plunger 24A is stationary).
- the smaller friction torque (brake) of the sum of the friction torques TB6, TB8 or the sum of the friction torques TB7, TB8 When the torque (TB) becomes equal to or greater than the thrust torque TF, sliding rotation of the screw engaging portion of the plunger 24A (plunger base end portion 24A1) is suppressed, and the screw engaging portion becomes relatively stationary (plunger 24A is stationary).
- the screw engaging portion is relatively immovable (the plunger 24A is stationary).
- the screw engagement portion is configured such that the screw engagement portion is relatively stationary (plunger 24A is stationary) with thrust torque TF ⁇ brake torque TB (sum of friction torques TB7 and TB8).
- the lead angle and flank angle of the male screw 25 are each set to 30 degrees.
- the operating characteristics of the plunger 24A when the engine is driven are the same as the operating characteristics (FIGS. 4 and 5) of the plunger 24 in the lash adjuster of the first embodiment described above.
- the plunger 24A decreases the valve clearance. It moves in the direction (direction in which the plunger 24A extends), and the increased valve clearance state is eliminated.
- valve clearance when the valve clearance is reduced, during the valve opening / closing operation, for example, when the pressing force of the cam 19a acts on the plunger 24A as an axial load near the maximum value (see (3) in FIGS. 4 and 5).
- the plunger 24A moves in the direction in which the valve clearance is increased (the direction in which the plunger 24A is reduced), and the valve clearance reduction state is eliminated.
- the angle of the male screw 25 (female screw 23) constituting the screw engaging portion is 30 degrees lead angle and flank angle (upper flank angle, lower flank angle) 30 degrees.
- the lead angle may be set in the range of 10 to 40 degrees and the flank angle may be set in the range of 5 to 45 degrees.
- the lead angle of the thread of the “screw” constituting the screw engaging portion can be smoothly slid and rotated even when an axial load in either the expansion or contraction direction acts on the plunger.
- the range of 10 to 40 degrees can suppress the sliding rotation of the screw engaging portion by the friction torque generated on the sliding contact surface of the plunger with the axial load transmission member.
- a small (large) lead angle is set so that the sliding contact surface F2 of the plungers 24, 124, 24A mainly with the axial load transmission member (rocker arm 16, cotter 12a) is set.
- a lead angle having a magnitude corresponding to the friction torque generated in F4 and F6 is set.
- flank angle is less than 5 degrees
- the friction angle is small due to the category of a square screw, so the significance of changing the flank angle is lost, and high-precision machining that is not affected by lead errors is difficult.
- flank angle exceeds 45 degrees, it is easy to process the “screw”, but the friction angle is very large, so even if the lead angle is changed, the “screw” is very self-supporting, so the flank angle is adjusted. Useless as a parameter is lost.
- the lead angle ⁇ is set in accordance with the magnitude of the friction torque generated on the sliding contact surface of the plungers 24, 124, 24A mainly with the axial load transmission member (the rocker arm 16, the cotter 12a).
- the flank angle is set. If the flank angle is large (small), the screw engaging part is slippery (difficult), so the timing and sliding property of the screw engaging part are finely adjusted. In order to achieve this, an appropriate flank angle is set.
- the male screw 25 is constituted by a trapezoidal screw or a triangular screw having an equal flank angle (the upper flank angle and the lower flank angle are the same).
- 25 (female screw 23) may be formed of a trapezoidal screw or a triangular screw having unequal flank angles with different upper flank angles and lower flank angles.
- the male screw 25 of the plunger 24, 124, 24A1 (24A1) and the female screw 23 of the housing 22, 122 are used.
- the male screw 25 of the rod member 114 is used.
- the internal thread 23 of the plunger 124 is composed of a single thread having one lead, but may be composed of multiple threads such as a double thread or a triple thread having a plurality of leads.
- a multi-threaded screw with multiple leads arranged at equal intervals in the axial direction can increase the pitch of the lead compared to a single-threaded screw with a single lead.
- the lead angle of the “screw” constituting the screw engaging portion is set as “when the axial load in either the expansion or contraction direction acts on the plunger, the screw engaging portion slips.
- a pitch corresponding to the diameter of the “screw” can be set by using a multi-threaded screw, and the shape and angle of the thread Standard design values such as JIS can be used.
- the surface pressure generated at the screw engaging portion decreases with respect to the axial load acting on the plunger, and the “screw” is less likely to wear out. It is possible to provide a mechanical lash adjuster that is particularly effective for the case.
- Valve (Valve) 11 Cylinder head 12a Cotter 14 Valve spring 20, 20A, 20B, 20C Mechanical lash adjuster 22, 122 Housing which is a plunger engaging member 23 Female screw 24, 124, 24A Plunger 24a Pivot portion 24A1 Plunger base end portion 24A2 Plunger tip portion 25 Male thread 26, 126 Plunger spring 114 Rod member as plunger engaging member F2, F6 Sliding contact surface with rocker arm as plunger load transmission member F3, F5, F8 Sliding contact surface with plunger spring of plunger F4 Plunger load transmission Sliding contact surface with valve shaft end (cotter) which is member F7 Sliding contact surface with plunger tip at plunger base end W Shaft load acting on plunger ⁇ Thread lead angle ⁇ 23a, ⁇ 25a Mountain flank angle ⁇ 23b, ⁇ 25b screw Yamanoshita flank TF thrust torque TB braking torque (friction torque)
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
前記ラッシュアジャスタは、カムの押圧力が軸荷重として作用するプランジャと、前記プランジャとねじ係合部を介し軸方向に係合し、周方向に回転しないように保持されたプランジャ係合部材と、前記バルブスプリングの付勢力作用方向と逆方向に前記プランジャを付勢するプランジャスプリングとを備え、
前記プランジャに伸長・縮小いずれの方向の軸荷重が作用した場合にも、前記ねじ係合部が滑り回転してプランジャが軸荷重作用方向に移動できるとともに、前記プランジャの主に軸荷重伝達部材との摺接面に発生する摩擦トルクによって前記ねじ係合部の滑り回転が抑制されて該ねじ係合部が相対的に不動となるように、前記ねじ係合部を構成する「ねじ」のねじ山のリード角とフランク角を設定するように構成した。
11 シリンダヘッド
12a コッタ
14 バルブスプリング
20,20A,20B,20C 機械式ラッシュアジャスタ
22、122 プランジャ係合部材であるハウジング
23 雌ねじ
24、124、24A プランジャ
24a ピボット部
24A1 プランジャ基端部
24A2 プランジャ先端部
25 雄ねじ
26,126 プランジャスプリング
114 プランジャ係合部材であるロッド部材
F2,F6 プランジャの荷重伝達部材であるロッカアームとの摺接面
F3,F5,F8 プランジャのプランジャスプリングとの摺接面
F4 プランジャの荷重伝達部材であるバルブ軸端部(のコッタ)との摺接面
F7 プランジャ基端部におけるプランジャ先端部との摺接面
W プランジャに作用する軸荷重
α ねじ山のリード角
θ23a,θ25a ねじ山の上側フランク角
θ23b,θ25b ねじ山の下側フランク
TF 推力トルク
TB ブレーキトルク(摩擦トルク)
Claims (3)
- バルブスプリングにより閉弁方向に付勢されたバルブの軸端部と、動弁機構構成部材であるカムとの間に介装されて、バルブクリアランスを調整する機械式ラッシュアジャスタにおいて、
前記ラッシュアジャスタは、カムの押圧力が軸荷重として作用するプランジャと、前記プランジャとねじ係合部を介し軸方向に係合し、周方向に回転しないように保持されたプランジャ係合部材と、前記バルブスプリングの付勢力作用方向と逆方向に前記プランジャを付勢するプランジャスプリングとを備え、
前記プランジャに伸長・縮小いずれの方向の軸荷重が作用した場合にも、前記ねじ係合部が滑り回転してプランジャが軸荷重作用方向に移動できるとともに、前記プランジャの主に軸荷重伝達部材との摺接面に発生する摩擦トルクによって前記ねじ係合部の滑り回転が抑制されて該ねじ係合部が相対的に不動となるように、前記ねじ係合部を構成する「ねじ」のねじ山のリード角とフランク角が設定されたことを特徴とする機械式ラッシュアジャスタ。 - 前記ねじ係合部を構成する「ねじ」のねじ山の角度は、リード角が10~40度、フランク角が5~45度の範囲に設定されたことを特徴とする請求項1に記載の機械式ラッシュアジャスタ。
- 前記ねじ係合部を構成する「ねじ」は、多条ねじで構成されたことを特徴とする請求項1または2に記載の機械式ラッシュアジャスタ。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201280035025.4A CN103703220B (zh) | 2012-03-16 | 2012-03-16 | 机械式间隙调整器 |
JP2012536119A JP5973916B2 (ja) | 2012-03-16 | 2012-03-16 | 機械式ラッシュアジャスタ |
US14/385,427 US9175580B2 (en) | 2012-03-16 | 2012-03-16 | Mechanical lash adjuster |
EP12870977.1A EP2826963B1 (en) | 2012-03-16 | 2012-03-16 | Mechanical lash adjuster |
PCT/JP2012/056841 WO2013136508A1 (ja) | 2012-03-16 | 2012-03-16 | 機械式ラッシュアジャスタ |
KR1020137034159A KR101895984B1 (ko) | 2012-03-16 | 2012-03-16 | 기계식 래시 어저스터 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2012/056841 WO2013136508A1 (ja) | 2012-03-16 | 2012-03-16 | 機械式ラッシュアジャスタ |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2013136508A1 true WO2013136508A1 (ja) | 2013-09-19 |
Family
ID=49160474
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2012/056841 WO2013136508A1 (ja) | 2012-03-16 | 2012-03-16 | 機械式ラッシュアジャスタ |
Country Status (6)
Country | Link |
---|---|
US (1) | US9175580B2 (ja) |
EP (1) | EP2826963B1 (ja) |
JP (1) | JP5973916B2 (ja) |
KR (1) | KR101895984B1 (ja) |
CN (1) | CN103703220B (ja) |
WO (1) | WO2013136508A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015191663A1 (en) | 2014-06-10 | 2015-12-17 | Jacobs Vehicle Systems, Inc. | Linkage between an auxiliary motion source and a main motion load path in an internal combustion engine |
WO2017216984A1 (ja) * | 2016-06-17 | 2017-12-21 | 日鍛バルブ株式会社 | 機械式ラッシュアジャスタ |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20160133150A (ko) | 2015-05-12 | 2016-11-22 | (주)한일포밍 | 캡 래쉬의 제조 방법 |
TW202134285A (zh) | 2019-11-26 | 2021-09-16 | 瑞士商諾華公司 | Cd19和cd22嵌合抗原受體及其用途 |
CN113356955A (zh) * | 2021-06-18 | 2021-09-07 | 广西玉柴机器股份有限公司 | 专用制动摇臂的制动间隙调整方法 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61502553A (ja) | 1984-06-27 | 1986-11-06 | ジ−ケイエヌ・テクノロジ−・リミテッド | 自動クリアランス・アジャスタ |
JPH031203U (ja) | 1989-05-29 | 1991-01-09 | ||
JP2007154852A (ja) * | 2005-12-08 | 2007-06-21 | Ntn Corp | 動弁装置におけるラッシュアジャスタ |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1781011A (en) * | 1929-04-16 | 1930-11-11 | Dardelet Threadlock Corp | Valve mechanism |
GB2160945B (en) | 1984-06-27 | 1988-05-18 | Gkn Technology Ltd | Automatic valve clearance adjuster |
EP1252418A2 (en) * | 2000-02-02 | 2002-10-30 | McKechnie Specialist Products Limited | Automatic valve clearance adjuster |
US6729288B2 (en) * | 2001-12-27 | 2004-05-04 | Ntn Corporation | Lash adjuster for use in valve gear |
JP4999526B2 (ja) * | 2007-04-18 | 2012-08-15 | Ntn株式会社 | ラッシュアジャスタ |
DE112008002557T5 (de) * | 2007-09-26 | 2010-08-05 | Ntn Corp. | Spielausgleichsvorrichtung |
JP2009108801A (ja) * | 2007-10-31 | 2009-05-21 | Ntn Corp | ラッシュアジャスタ |
JP2009270565A (ja) * | 2008-04-09 | 2009-11-19 | Ntn Corp | ラッシュアジャスタ |
JP2010007659A (ja) * | 2008-05-30 | 2010-01-14 | Ntn Corp | ラッシュアジャスタ |
JP2010019090A (ja) * | 2008-07-08 | 2010-01-28 | Ntn Corp | ラッシュアジャスタ |
-
2012
- 2012-03-16 JP JP2012536119A patent/JP5973916B2/ja not_active Expired - Fee Related
- 2012-03-16 US US14/385,427 patent/US9175580B2/en not_active Expired - Fee Related
- 2012-03-16 EP EP12870977.1A patent/EP2826963B1/en active Active
- 2012-03-16 WO PCT/JP2012/056841 patent/WO2013136508A1/ja active Application Filing
- 2012-03-16 CN CN201280035025.4A patent/CN103703220B/zh not_active Expired - Fee Related
- 2012-03-16 KR KR1020137034159A patent/KR101895984B1/ko active IP Right Grant
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61502553A (ja) | 1984-06-27 | 1986-11-06 | ジ−ケイエヌ・テクノロジ−・リミテッド | 自動クリアランス・アジャスタ |
JPH031203U (ja) | 1989-05-29 | 1991-01-09 | ||
JP2007154852A (ja) * | 2005-12-08 | 2007-06-21 | Ntn Corp | 動弁装置におけるラッシュアジャスタ |
Non-Patent Citations (1)
Title |
---|
"Development of End-Pivot Type Mechanical Lash Adjuster", NTN TECHNICAL REVIEW, 2007 |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10626763B2 (en) | 2014-06-10 | 2020-04-21 | Jacobs Vehicle Systems, Inc. | Linkage between an auxiliary motion source and a main motion load path in an internal combustion engine |
US11313259B2 (en) | 2014-06-10 | 2022-04-26 | Jacobs Vehicle Systems, Inc. | Linkage between an auxiliary motion source and a main motion load path in an internal combustion engine |
EP3653851A1 (en) | 2014-06-10 | 2020-05-20 | Jacobs Vehicle Systems, Inc. | Linkage between an auxiliary motion source and a main motion load path in an internal combustion engine |
WO2015191663A1 (en) | 2014-06-10 | 2015-12-17 | Jacobs Vehicle Systems, Inc. | Linkage between an auxiliary motion source and a main motion load path in an internal combustion engine |
WO2017217493A1 (ja) * | 2016-06-17 | 2017-12-21 | 日鍛バルブ株式会社 | 動弁機構及び機械式ラッシュアジャスタ |
CN108026793A (zh) * | 2016-06-17 | 2018-05-11 | 日锻汽门株式会社 | 机械式间隙调整器 |
KR20190019036A (ko) | 2016-06-17 | 2019-02-26 | 니탄 밸브 가부시키가이샤 | 기계식 래시 어저스터 |
DE112016006979T5 (de) | 2016-06-17 | 2019-03-14 | Nittan Valve Co., Ltd. | Mechanische Spiel-Einstellvorrichtung |
KR20180033216A (ko) | 2016-06-17 | 2018-04-02 | 니탄 밸브 가부시키가이샤 | 동밸브 기구 및 기계식 래시 어저스터 |
WO2017216946A1 (ja) * | 2016-06-17 | 2017-12-21 | 日鍛バルブ株式会社 | 機械式ラッシュアジャスタ |
US10934897B2 (en) | 2016-06-17 | 2021-03-02 | Nittan Valve Co., Ltd. | Mechanical lash adjuster |
CN108026793B (zh) * | 2016-06-17 | 2021-04-27 | 日锻汽门株式会社 | 机械式间隙调整器 |
WO2017216984A1 (ja) * | 2016-06-17 | 2017-12-21 | 日鍛バルブ株式会社 | 機械式ラッシュアジャスタ |
Also Published As
Publication number | Publication date |
---|---|
US20150075470A1 (en) | 2015-03-19 |
EP2826963B1 (en) | 2021-01-13 |
JPWO2013136508A1 (ja) | 2015-08-03 |
KR101895984B1 (ko) | 2018-09-06 |
JP5973916B2 (ja) | 2016-08-23 |
CN103703220A (zh) | 2014-04-02 |
EP2826963A4 (en) | 2016-01-13 |
KR20140142128A (ko) | 2014-12-11 |
EP2826963A1 (en) | 2015-01-21 |
US9175580B2 (en) | 2015-11-03 |
CN103703220B (zh) | 2017-07-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2013136508A1 (ja) | 機械式ラッシュアジャスタ | |
JP2009174488A (ja) | ラッシュアジャスタ | |
JP4851541B2 (ja) | 機械式アジャスタ | |
JP2005248912A (ja) | バルブクリアランス自動調整装置 | |
US20110036314A1 (en) | Lash adjuster | |
EP3473824B1 (en) | Valvetrain and mechanical lash adjuster | |
WO2012043257A1 (ja) | 内燃機関における動弁装置 | |
JP2007146783A (ja) | ロッカアーム式動弁装置およびロッカアーム | |
US20100288219A1 (en) | Lash adjuster | |
JP2006328971A (ja) | 動弁装置におけるラッシュアジャスタ | |
JP2009257305A (ja) | ラッシュアジャスタ | |
JP2009108801A (ja) | ラッシュアジャスタ | |
JP2005291153A (ja) | アーム式動弁装置 | |
WO2010004909A1 (ja) | ラッシュアジャスタ | |
JP4190274B2 (ja) | 動弁装置におけるラッシュアジャスタ | |
JP2011021509A (ja) | ラッシュアジャスタ | |
JP5472809B2 (ja) | 動弁装置におけるラッシュアジャスタ | |
JP2009203975A (ja) | ラッシュアジャスタ | |
JP2003227317A (ja) | 動弁装置におけるラッシュアジャスタ | |
WO2009119362A1 (ja) | ラッシュアジャスタ | |
JP2009293423A (ja) | ラッシュアジャスタ | |
JP2009228566A (ja) | ラッシュアジャスタ | |
JP2005264830A (ja) | アーム式動弁装置 | |
JP2003227319A (ja) | 動弁装置におけるラッシュアジャスタ | |
JP2010059797A (ja) | ラッシュアジャスタ |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ENP | Entry into the national phase |
Ref document number: 2012536119 Country of ref document: JP Kind code of ref document: A |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 12870977 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 20137034159 Country of ref document: KR Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2012870977 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 14385427 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |