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US20030075131A1 - Automatic valve clearance adjuster - Google Patents

Automatic valve clearance adjuster Download PDF

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Publication number
US20030075131A1
US20030075131A1 US10/182,888 US18288802A US2003075131A1 US 20030075131 A1 US20030075131 A1 US 20030075131A1 US 18288802 A US18288802 A US 18288802A US 2003075131 A1 US2003075131 A1 US 2003075131A1
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US
United States
Prior art keywords
housing
screw member
screw
adjuster
thread
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/182,888
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English (en)
Inventor
Peter Gill
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
McKechnie Specialist Products Ltd
Original Assignee
McKechnie Specialist Products Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB0003300A external-priority patent/GB0003300D0/en
Priority claimed from GB0026081A external-priority patent/GB2368370B/en
Application filed by McKechnie Specialist Products Ltd filed Critical McKechnie Specialist Products Ltd
Assigned to MCKECHNIE SPECIALIST PRODUCTS LIMITED reassignment MCKECHNIE SPECIALIST PRODUCTS LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GILL, PETER JOHN
Publication of US20030075131A1 publication Critical patent/US20030075131A1/en
Abandoned legal-status Critical Current

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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
    • F01L1/20—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
    • F01L2303/00—Manufacturing of components used in valve arrangements
    • F01L2303/01—Tools for producing, mounting or adjusting, e.g. some part of the distribution

Definitions

  • This invention relates to an automatic valve clearance adjuster for a valve operating mechanism as may be used, for example, in an internal combustion engine; the adjuster comprising an internally screw threaded housing, an externally threaded screw extending within the housing, and force exerting means acting axially on the screw to cause it to rotate and advance outwardly of an open end of the housing to lengthen the adjuster; the cooperating thread forms of the screw and the housing being so configured that the screw will rotate freely and advance out of the housing under the bias of the said axially directed force.
  • valve clearance adjuster When such a valve clearance adjuster is placed in a space between two relatively-movable components of a valve operating mechanism, with the housing engaging one component and the screw engaging the other component, the adjuster operates to take up clearances in the valve operating mechanism by extending, by advancement of the screw member out of the housing, until it fully occupies the space between the components.
  • the adjuster may be interposed directly or indirectly between a cam and a valve or a valve operating member.
  • the adjuster may provide a fulcrum for a lever type of valve-operating member, the position of the fulcrum being varied by the adjuster to take up operating clearances.
  • FIGS. 1, 2 and 3 illustrate possible dispositions of automatic valve clearance adjusters in valve operating mechanisms for internal combustion engines
  • FIG. 4 is a cross-sectional view, on an enlarged scale, of the screw-threads of an adjuster which may be in accordance with the invention
  • FIG. 5 shows an automatic valve clearance adjuster in accordance with the invention, a portion of cam follower and a diagrammatic representation of the relevant cam position, where the adjuster is required to take up clearances in the valve train;
  • FIG. 6 shows the valve clearance adjuster of FIG. 5, and an indication of the relevant cam position, where the adjuster has just eliminated clearances in the valve train;
  • FIG. 7 shows the valve clearance adjuster of FIGS. 5 and 6, a portion of the cam follower and a diagrammatic indication of the relevant cam position, where the valve train is just beginning to open a valve;
  • FIG. 8 shows an automatic valve clearance adjuster in accordance with the prior art, the adjuster having just taken up clearance which may previously have existed at one or more positions such as A, B, C, and D in the engine valve train;
  • FIG. 9 shows the adjuster of FIG. 8, in its condition when the valve is being opened
  • FIG. 10 shows an automatic valve clearance adjuster according to a further embodiment of the prior art
  • FIG. 11 shows the valve clearance adjuster of FIGS. 8 and 9, with the screw displaced laterally within the housing of the adjuster;
  • FIG. 12 shows the adjuster of FIGS. 8 and 9, with the screw angularly displaced within the housing
  • FIG. 13 is a fragmentary view of contacting flanks of mating screw-threads having a relatively low flank angle
  • FIG. 14 is a fragmentary view of contacting flanks and mating screw-threads having a relatively high flank angle
  • FIG. 15 is a fragmentary view of mating screw-threads illustrating the relationship between axial and radial thread clearance
  • FIG. 16 illustrates a position an adjuster in accordance with the invention may assume prior to assembly into an engine
  • FIG. 17 shows an automatic valve clearance adjuster in accordance with a further aspect of the invention, ready for assembly into an engine.
  • an automatic valve clearance adjuster comprising a housing 1 , an internal screw thread 2 extending into the housing, and a screw member 3 having an external screw thread 4 co-operating with the internal thread 2 of the housing.
  • Reference numeral 5 indicates an axial force applied by spring means to the screw member at the end 6 thereof which is in the housing: preferably such force is applied by a compression spring engaging the screw member as described hereafter.
  • Reference numeral 7 indicates the end of the screw member which protrudes outwardly from the housing 1 and which engages a co-operating part of the valve operating mechanism in order to transmit a valve-operating force or provide a reaction force, depending on the nature of the valve operating mechanism, which is necessary when the valve is to be opened against the force of its closing spring by the operation of a cam on a camshaft.
  • the adjuster is self-contained and is stationary in a socket in the body of the engine.
  • the protruding valve actuating end 7 of the screw member 3 has a domed end with a spherical surface, said domed end fits inside a cavity 9 in a cam follower 8 .
  • the cavity 9 has an ogive or conical cross section and therefore makes a narrow circular band of contact with the domed end 7 .
  • Rotation of the cam 10 makes the cam follower 8 oscillate about the fulcrum provided by the domed end 7 and thus actuates the engine valve via the valve stem. 11 .
  • FIG. 1 the housing 1 is shown with an open lower end which would be suitable if the force 5 were provided by oil pressure.
  • the housing would have a closed end, as described hereafter.
  • FIG. 2 shows an adjuster incorporated in a “bucket” type of cam-follower; the housing 1 is preferably integral with the bucket 13 .
  • the valve actuating end 7 of the screw member 3 is shaped to make with the valve stem 14 an area of circular, annular or conical contact.
  • the bucket 13 is slidably mounted in a bore in the body of the engine.
  • the cam 10 operates directly via the bucket 13 and the adjuster to impart downward valve operating movement to the valve 14 .
  • the adjuster is self contained and acts as a moveable push-rod between the cam 15 and a rocker-aim 17 .
  • the adjuster is slidably mounted in a bore in the body of the engine.
  • the adjuster transmits motion from the cam 15 to the rocker-arm 17 which can pivot about the axis 41 and so impart downward valve operating movement to the valve 18 .
  • the adjuster is fitted with a pressure pad 16 between the rocker-arm 17 and the valve actuating end 7 of the screw member 3 .
  • the pressure pad can slide axially within the housing 1 but is restrained against rotation therein.
  • the adjuster could be incorporated in other types of valve train.
  • the adjuster housing 1 could be an integral part of a rocker-arm in a rocker-arm/push-rod mechanism.
  • FIGS. 8, 9, and 10 each of which shows a valve clearance adjuster which mainly comprises a screw within an internally threaded housing as previously mentioned.
  • the valve clearance adjuster is shown with a schematic representation of one type of engine valve train mechanism with which said adjuster is in working relationship. The reasoning to be put forward applies to any other valve train mechanism.
  • FIG. 10 shows the cam 10 of an engine, said cam being shown in an angular position which would allow the engine valve to close as shown at 39 .
  • FIG. 10 also shows that the torsion spring 29 has rotated the screw 30 so that the said screw has advanced out of the housing 38 to eliminate any clearance which may previously have existed at one or more positions such as A. B, C and D in the engine valve train.
  • FIG. 10 shows the cam 10 of an engine, said cam being shown in an angular position which would allow the engine valve to close as shown at 39 .
  • FIG. 10 also shows that the torsion spring 29 has rotated the screw 30 so that the said screw has advanced out of the housing 38 to eliminate any clearance which may previously have existed at one or more positions such as A. B, C and D in the engine valve train.
  • FIG. 10 shows the cam 10 of an engine, said cam being shown in an angular position which would allow the engine valve to close as shown at 39 .
  • FIG. 10 also shows that the torsion spring 29 has rotated the screw 30 so that the
  • FIG. 8 depicts the engine cam 10 in an angular position which would allow the engine valve 11 to close as shown at 39 . It also shows that the compression spring 22 has pushed the running flanks 24 S of the screw into contact with the running flanks 24 H of the housing and has advanced the screw 3 out of the housing 1 to eliminate any clearance which may have existed previously at one or more of positions such as A, B, C, D in the engine valve train. The advancing of the screw 3 out of the housing is hereinafter referred to as “take-up” movement.
  • FIG. 9 depicts a situation in which the engine cam 10 has turned into an angular position in which it exerts a force which is reacted by the stem 11 of the valve and by the screw 3 of the clearance adjuster.
  • the reaction on the valve stem has opened the valve as shown at 40 ; the reaction on the screw has forced the locking flanks 25 S of the screw through the clearance ( 26 FIG. 8) and into contact with the locking flanks 25 H of the housing.
  • the assembly of screw 3 and housing 1 should then behave as a solid in resisting the said reaction because rotation of and consequent retraction of the screw into the housing should be prevented by the enhanced frictional resistance which results from the relatively high angle of inclination G L of the locking flanks.
  • buttress threads should, in theory, ensure that under the action of axially applied forces there is a high resistance to the screw 3 being pressed into the housing and a low resistance to the screw being advanced out of the housing;
  • FIGS. 13 and 14 are enlargements of the zone labelled F in FIGS. 11 and 12.
  • the flank angle G R is drawn with a small angle of inclination.
  • FIG. 14 shows another example and is drawn with G R having a larger angle of inclination.
  • the reference numerals 36 and 37 indicate elements of the running flanks 24 S of the screw and the running flanks 24 H in the housing respectively. Under the same frictional conditions in each of the two examples, a force P could produce the movement Q more readily in the example shown in FIG. 13 than in the example shown in FIG. 14. The movement Q is necessary to re-centralise said screw within the housing 1 .
  • JK+KL ( C ⁇ tangent 15)+( C ⁇ tangent 75)
  • One object of the present invention is to provide an improved construction of mechanical valve clearance adjuster, with particular reference to:
  • the valve clearance adjuster comprises an internally threaded housing and, within said housing, a screw member having an external thread with a form which is generally complementary to the internal thread form of the housing and fits therein with a predetermined axial clearance; the thread being trapezoidal in form, symmetrical in axial cross section and exhibiting equal frictional resistance against movement in either axial direction; the flank angles, helix angle and number of starts in the screw thread being determined to ensure that the screw member will rotate and advance axially out of the housing solely under the influence of an axial force on its non-emerging end; the emerging end of said screw member being configured to work in conjunction with an adjacent component of, for example, the valve train of an IC engine and to receive from said adjacent component a frictional resistance to rotation; the non-emerging end of said screw being configured so that it assists axial movement of the screw member when it is acted upon by the aforesaid axially directed force.
  • flanks of each thread on the screw member and in the housing are preferably inclined at an angle of 30° on each side of a perpendicular to the axis of the screw thread when viewed in axial cross section.
  • These flank angles are found in modern threads which are used in standard bolts and nuts etc., and are commonly termed 60° threads.
  • the zone of contact between the end of the screw member and the co-acting member of the valve train can be in the form of, for example:—
  • the width dimension may be small enough to justify the assumption that the contact condition is a line of circular contact.
  • the axis of the circle perpendicular to its plane, coincides with the axis about which the screw member could rotate.
  • a value D could be assigned to represent the diameter of the circle to which frictional resistance acts tangentially. Giving the mean diameter of the screw thread the symbol d, external frictional resistance to “back-off” movement is largely dependant upon the ratio D ⁇ d and can therefore be controlled by design of:—
  • FIG. 5 shows the screw member 3 in a notional position within the housing 1 when clearance has developed between members of the engine valve train.
  • the entire amount of clearance is shown as a single gap 42 between the end 7 of the screw member 3 and the cavity 9 in the cam follower 8 .
  • the cam 10 can be in any angular position in which its constant radius portion is contacting the cam follower 8 , this is indicated diagrammatically in FIG. 5A.
  • the spring 22 is able to produce “take-up” movement, i.e. to advance the screw member 3 (upward as illustrated) out of the housing 1 until the spherical end 7 contacts the surface of the cavity 9 in the cam follower 8 , as shown in FIG. 6.
  • the cam 10 can still be regarded as being in any angular position in which any point on its constant radius portion is contacting the cam follower 8 , as shown diagrammatically in FIG. 6A.
  • FIGS. 7 and 7A show the situation where the cam 10 has turned into a position where it has pushed the cam follower 8 just sufficiently to move the screw member 3 downwards through the previously existing clearance gap 43 . That is to say the clearance gap is now above (as illustrated at 44 ) the threads of the screw member 3 . At this instant between the mating threads there will be a continuous oil film and consequently there will be from within the housing 1 a low resistance to upward “back-off” movement of the screw member 3 . Resistance to “back-off” movement is therefore provided externally by friction at the contact between the end 7 of the screw member and the surface of the cavity 9 in the cam follower 8 .
  • D effective diameter of the circle of frictional contact between the end 7 of the screw and the surface of the cavity 9 in the cam follower 8 .
  • d mean diameter of the screw thread.
  • increased resistance to “back-off” movement can be obtained by increasing the angle W (FIG. 6), i.e. the angle between a transverse plane and a common tangent to the contacting surfaces of the cavity 9 and the spherical end 7 .
  • an automatic valve clearance adjuster in accordance with the invention When an automatic valve clearance adjuster in accordance with the invention is not incorporated in a valve operating mechanism, i.e. not assembled in an engine, and hence is not constrained by the components it engages in the mechanism, the force exerting means may cause the screw member to advance outwardly of the housing to its maximum extent. In this condition the adjuster cannot be assembled into the engine, and requires to be shortened by retraction of the screw member into the housing by rotational movement relative thereto, until the overall length of the adjuster is sufficiently reduced for it to be placed between the relevant components.
  • a valve clearance adjuster comprising a housing having an internal screw thread, a screw member extending into the housing from an open end thereof and having an external screw thread engaging the thread within the housing, and spring means acting on the screw member in the direction of its longitudinal axis; the co-operating screw threads of the screw member and housing being of such a configuration that the screw member will rotate and advance out of the housing under the influence of the spring means; wherein there is provided abutment means operable between the screw member and the housing when the screw member is screwed into the housing to an inner position, whereby frictional forces can be established between the screw member, housing and abutment means sufficient to retain the screw member in said inner position against the action of the spring means.
  • a valve clearance adjuster in accordance with this aspect of the invention, it is possible for the screw member to be screwed into the housing to its inner position at which the abutment means operable between the screw member and the housing is engaged. Then if the screw member is tightened to cause an increased force to be exerted between the screw member, abutment means and housing, frictional forces will be established therebetween of sufficient magnitude to resist the action of the spring means which tend to advance the screw member outwardly of the housing.
  • valve clearance adjuster should be arranged so that when the screw member is in its inner position the overall length of the adjuster is sufficiently small to enable it to be easily assembled in the required position in the operating mechanism for a valve of an engine: hence an engine with a plurality of the valve clearance adjusters can easily be assembled. Tests have shown that on starting the engine, the shock induced in each adjuster by impact from the cam which operates its particular valve is sufficient to free the frictional lock between the screw and housing, so that the screw member immediately takes up the correct working position relative to the housing of the adjuster.
  • the screw member of the adjuster may be adapted to be engaged by a tool by which it can be screwed into the housing to cause the abutment means to be bought into operation as aforesaid.
  • a tool for engagement with the screw member may comprise a socket or recess with a surface configuration able to establish frictional engagement with the head of the screw member sufficient to enable it to be tightened to engage the abutment means when the screw is in its inner position.
  • the abutment means may comprise a shoulder formation provided inside the housing and engageable by an innermost end face of the screw member when the latter is in its inner position.
  • a shoulder may be afforded by the housing itself, or a separate member, e.g. a sleeve, affording such a shoulder may be inserted in the housing.
  • the screw member may be provided with an abutment formation which is engageable with an end face of the housing.
  • a formation may comprise a collar provided on the screw member beneath a head part thereof.
  • Such a collar may also be usable for holding the screw member to screw it into the housing and tightening it when the collar has engaged the housing, rendering it unnecessary for a separate tool to be used in this case.
  • valve clearance adjuster is in accordance with the first aspect of the invention.
  • it may alternatively be an adjuster incorporating a buttress thread such as referred to in the above discussion of the prior art.
  • FIG. 16 shows an adjuster such as illustrated in FIG. 5, 6 or 7 , in the condition it can assume when not assembled into an engine.
  • the screw member has advanced out of the housing, so the overall length of the adjuster will be substantially greater than the space available to be occupied by the adjuster in an engine.
  • the screw member 3 has to be screwed into the housing 1 to the extent that the overall length of the adjuster is reduced to a magnitude permitting easy assembly.
  • Such overall length of the adjuster will be slightly less than the typical operating lengths of the adjuster shown in FIGS. 6 and 7.
  • abutment means operable between the screw member and housing when the screw member is in an innermost position similar to that in which it is shown in FIG. 5.
  • FIG. 17 One form of such abutment means is shown in FIG. 17, afforded by a cylindrical sleeve 50 disposed within the housing and surrounding the spring 22 .
  • One end of the sleeve 50 engages the closed lower end 51 of the housing, while the other end of the sleeve abuts end face 6 of the screw member in the annular region surrounding the recess therein.
  • the housing could be provided with an integral abutment formation with which the screw member is engageable when it is in its innermost position.
  • a formation could be provided, for example, by having the interior of the housing of a smaller diameter in its part occupied by the spring 22 , beneath the lower end of its internal screw thread.
  • the screw member could be provided with an external collar beneath its head, engageable with outer end face 55 of the housing. Such a collar may be used as a means for turning the screw when it is to be screwed into the housing until the collar abuts the latter.
  • a tool such as that indicated at 52 in FIG. 17 may be used to engage the part-spherical head end 7 of the screw member to turn it.
  • Tool 52 has a tapering socket 53 at one end whose angle is such that when pressed into engagement with the head of the screw member by hand it will frictionally grip the latter with sufficient force to screw the screw member into the housing against the action of spring 22 and engage the abutment sleeve 50 .
  • Tool 52 has a grip portion 54 enabling it to be held and turned easily by a person using it.
  • an adjuster which has to have a helix angle of 6°, which should produce adequate “take up” movement when it is subject to effective lubrication in an engine, should have sufficient thread friction to keep the screw in an inner position within the housing without the need for the assembly device.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
US10/182,888 2000-02-02 2001-01-31 Automatic valve clearance adjuster Abandoned US20030075131A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB0003300.1 2000-02-02
GB0003300A GB0003300D0 (en) 2000-02-02 2000-02-02 Automatic valve clearance adjuster
GB0026081.0 2000-10-25
GB0026081A GB2368370B (en) 2000-10-25 2000-10-25 Automatic valve clearance adjuster

Publications (1)

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US20030075131A1 true US20030075131A1 (en) 2003-04-24

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Family Applications (1)

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US10/182,888 Abandoned US20030075131A1 (en) 2000-02-02 2001-01-31 Automatic valve clearance adjuster

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US (1) US20030075131A1 (fr)
EP (1) EP1252418A2 (fr)
JP (1) JP2003521624A (fr)
KR (1) KR20030041853A (fr)
CN (1) CN1422359A (fr)
AU (1) AU2001230386A1 (fr)
BR (1) BR0108072A (fr)
CA (1) CA2399059A1 (fr)
MX (1) MXPA02007401A (fr)
WO (1) WO2001057367A2 (fr)

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US20040231621A1 (en) * 2003-05-22 2004-11-25 Ken Yamamoto Arm type valve gear
US20080173266A1 (en) * 2006-12-20 2008-07-24 Yamaha Hatsudoki Kabushiki Kaisha Variable valve drive system for engine
US20100126453A1 (en) * 2007-05-14 2010-05-27 Eiji Maeno Lash adjuster for swing arm type valve gear
US20100263613A1 (en) * 2007-12-07 2010-10-21 Makoto Yasui Lash adjuster
US20100275865A1 (en) * 2008-01-28 2010-11-04 Makoto Yasui Lash adjuster
US20100288219A1 (en) * 2008-01-22 2010-11-18 Makoto Yasui Lash adjuster
US20110036314A1 (en) * 2008-03-24 2011-02-17 Makoto Yasui Lash adjuster
US20120006293A1 (en) * 2010-07-12 2012-01-12 Schaeffler Technologies Gmbh & Co. Kg Mechanical valve clearance compensation element with two-part adjusting bolts
US20190145287A1 (en) * 2016-06-17 2019-05-16 Nittan Valve Co., Ltd. Valve Mechanism and Mechanical Lash Adjuster

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DE102005054115A1 (de) * 2005-11-12 2007-05-24 Schaeffler Kg Verfahren zur variablen Ventilsteuerung eines Verbrennungsmotors
JP2008267224A (ja) * 2007-04-18 2008-11-06 Ntn Corp ラッシュアジャスタ
WO2009072481A1 (fr) * 2007-12-07 2009-06-11 Ntn Corporation Rattrapeur de jeu
JP2009203975A (ja) * 2008-01-28 2009-09-10 Ntn Corp ラッシュアジャスタ
JP2009243465A (ja) * 2008-03-10 2009-10-22 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
JP2010019156A (ja) * 2008-07-10 2010-01-28 Ntn Corp ラッシュアジャスタ
JP2011127533A (ja) * 2009-12-18 2011-06-30 Ntn Corp アーム式動弁装置
CN103703220B (zh) * 2012-03-16 2017-07-28 日锻汽门株式会社 机械式间隙调整器
JP5943854B2 (ja) * 2013-02-15 2016-07-05 株式会社オティックス ラッシュアジャスタ
CN104895632A (zh) * 2015-04-16 2015-09-09 奇瑞汽车股份有限公司 一种气门间隙可机械调节的滚子摇臂气门机构
US10132206B1 (en) * 2017-05-19 2018-11-20 Caterpillar Inc. Common rocker arm for hydraulic lash adjuster and non-hydraulic lash adjuster

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US2308858A (en) * 1940-03-04 1943-01-19 Thompson Prod Inc Hydromechanical clearance regulator
US2872961A (en) * 1954-06-30 1959-02-10 Elastic Stop Nut Corp Fastening device with means for sealing against both a threaded companion fastener and a worksurface
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Cited By (14)

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US6901896B2 (en) * 2003-05-22 2005-06-07 Ntn Corporation Arm type valve gear
US20040231621A1 (en) * 2003-05-22 2004-11-25 Ken Yamamoto Arm type valve gear
US7980210B2 (en) * 2006-12-20 2011-07-19 Yamaha Hatsudoki Kabushiki Kaisha Variable valve drive system for engine
US20080173266A1 (en) * 2006-12-20 2008-07-24 Yamaha Hatsudoki Kabushiki Kaisha Variable valve drive system for engine
US20100126453A1 (en) * 2007-05-14 2010-05-27 Eiji Maeno Lash adjuster for swing arm type valve gear
US8181615B2 (en) * 2007-05-14 2012-05-22 Ntn Corporation Lash adjuster for swing arm type valve gear
US20100263613A1 (en) * 2007-12-07 2010-10-21 Makoto Yasui Lash adjuster
US20100288219A1 (en) * 2008-01-22 2010-11-18 Makoto Yasui Lash adjuster
US20100275865A1 (en) * 2008-01-28 2010-11-04 Makoto Yasui Lash adjuster
US20110036314A1 (en) * 2008-03-24 2011-02-17 Makoto Yasui Lash adjuster
US20120006293A1 (en) * 2010-07-12 2012-01-12 Schaeffler Technologies Gmbh & Co. Kg Mechanical valve clearance compensation element with two-part adjusting bolts
US8635981B2 (en) * 2010-07-12 2014-01-28 Schaeffler Technologies AG & Co. KG Mechanical valve clearance compensation element with two-part adjusting bolts
US20190145287A1 (en) * 2016-06-17 2019-05-16 Nittan Valve Co., Ltd. Valve Mechanism and Mechanical Lash Adjuster
US10934897B2 (en) 2016-06-17 2021-03-02 Nittan Valve Co., Ltd. Mechanical lash adjuster

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KR20030041853A (ko) 2003-05-27
MXPA02007401A (es) 2004-09-10
JP2003521624A (ja) 2003-07-15
BR0108072A (pt) 2004-01-06
AU2001230386A1 (en) 2001-08-14
EP1252418A2 (fr) 2002-10-30
WO2001057367A3 (fr) 2002-03-14
CN1422359A (zh) 2003-06-04
CA2399059A1 (fr) 2001-08-09
WO2001057367A2 (fr) 2001-08-09

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