JP2006161655A - Lash adjuster - Google Patents

Lash adjuster Download PDF

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Publication number
JP2006161655A
JP2006161655A JP2004353223A JP2004353223A JP2006161655A JP 2006161655 A JP2006161655 A JP 2006161655A JP 2004353223 A JP2004353223 A JP 2004353223A JP 2004353223 A JP2004353223 A JP 2004353223A JP 2006161655 A JP2006161655 A JP 2006161655A
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Prior art keywords
lash adjuster
cylinder head
plunger
mounting
oil
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JP2004353223A
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JP4420803B2 (en
Inventor
Masateru Kishi
正輝 貴志
Mitsunori Teramura
光功 寺村
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Otics Corp
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Otics Corp
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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
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/2405—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically by means of a hydraulic adjusting device located between the cylinder head and rocker arm
    • 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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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To reduce waste caused by structural overlap of a lash adjuster and a cylinder head for mounting the lash adjuster to reduce the weight of the overlapped portion, and to simplify the portion by reducing the number of components. <P>SOLUTION: This lash adjuster is formed of a plunger 40 of which tip portion abuts on a rocker arm 50 and a body formed integrally with a mounting part 21 of the cylinder head 9. Therefore, the mounting part 22 has a function as a body of the lash adjuster housing a base end portion of the plunger 40, in addition to the original function of the mounting part 22 for mounting the lash adjuster to the cylinder head 9. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、内燃機関のシリンダヘッドに取り付けられるラッシュアジェスタに関する。   The present invention relates to a lash adjuster attached to a cylinder head of an internal combustion engine.

内燃機関のバルブクリアランスを自動調整するために油圧式のラッシュアジェスタが用いられるが、そのラッシュアジェスタはシリンダヘッドに取り付けられる場合が多い。この種のラッシュアジャスタは、図５に示す従来例のラッシュアジャスタ９５のように、先端部分がロッカアーム９９に当接するプランジャ９７と、それをハウジングするボディ９６とからなり、シリンダヘッド９０に設けられた取付部９２に挿入されて、取り付けられる（特許文献１）。
特開２００４−２７８３７７公報 In order to automatically adjust the valve clearance of an internal combustion engine, a hydraulic lash adjuster is used, but the lash adjuster is often attached to a cylinder head. This type of lash adjuster is provided with a cylinder head 90, which is composed of a plunger 97 whose tip is in contact with the rocker arm 99 and a body 96 that houses the plunger 97, as in the conventional lash adjuster 95 shown in FIG. It is inserted into the attachment portion 92 and attached (Patent Document 1).
JP 2004-278377 A

上記構造においては、プランジャ９７をハウジングしたボディ９６が取付部９２に挿入されているため、該プランジャ９７はボディ９６と取付部９２の内壁とによって略二重に囲み込まれている。そのため、ラッシュアジャスタ９５及びそれを取り付けるシリンダヘッド９０は、構造上の重複によってその分重くなっている他、部品点数の多い複雑な構造になっている。   In the above structure, since the body 96 housing the plunger 97 is inserted into the mounting portion 92, the plunger 97 is substantially double enclosed by the body 96 and the inner wall of the mounting portion 92. Therefore, the lash adjuster 95 and the cylinder head 90 to which the lash adjuster 95 is attached have a complicated structure with a large number of parts, in addition to being heavy due to structural overlap.

上記問題点を解決するため、本発明では、ラッシュアジェスタのボディとそれを取り付けるシリンダヘッドの取付部とを一体的に形成することにより、構造上の重複による無駄を減らしその部分を軽量化すると同時に、部品点数を減らし該部分を簡略化することを目的とする。   In order to solve the above problems, in the present invention, by integrally forming the body of the lash adjuster and the mounting portion of the cylinder head to which the lash adjuster is mounted, waste due to structural duplication is reduced and the portion is reduced in weight. At the same time, it aims to reduce the number of parts and simplify the part.

上記の目的を達成するため、本発明のラッシュアジャスタは、先端部分がロッカアームに当接するプランジャと、前記プランジャの基端部分をハウジングするボディとを含み、シリンダヘッドの取付部に取り付けられるラッシュアジャスタにおいて、前記ボディが前記シリンダヘッドの取付部に一体形成されたことを特徴とする。すなわち、専用部品としてのボディが省かれ、シリンダヘッドの取付部の一部がボディとして形成されたものである。   In order to achieve the above object, a lash adjuster according to the present invention is a lash adjuster that includes a plunger whose front end portion abuts against a rocker arm and a body that houses a base end portion of the plunger, and is attached to a mounting portion of a cylinder head. The body is integrally formed with the mounting portion of the cylinder head. That is, the body as a dedicated part is omitted, and a part of the mounting portion of the cylinder head is formed as the body.

本発明によれば、ラッシュアジャスタのボディがシリンダヘッドの取付部に一体形成されるため、構造上の重複による無駄が減りその部分が軽量化されると同時に、部品点数が減り該部分が簡略化される。   According to the present invention, since the body of the lash adjuster is integrally formed with the cylinder head mounting portion, waste due to structural overlap is reduced and the portion is reduced in weight, and at the same time, the number of parts is reduced and the portion is simplified. Is done.

本発明のラッシュアジャスタ３０は、先端部分がロッカアーム５０に当接するプランジャ４１と、シリンダヘッド９の取付部２１に一体形成されたボディとからなる。そのため、取付部２１は、ラッシュアジャスタをシリンダヘッドに取り付ける取付部本来の機能以外にも、プランジャ４１の基端部分をハウジングする該ボディとしての機能も兼ね備えている。   The lash adjuster 30 according to the present invention includes a plunger 41 whose tip is in contact with the rocker arm 50 and a body integrally formed with the mounting portion 21 of the cylinder head 9. Therefore, the attachment portion 21 has a function as a body for housing the proximal end portion of the plunger 41 in addition to the original function of the attachment portion for attaching the lash adjuster to the cylinder head.

図１及び図２は、複数気筒を備えた内燃機関における実施例１の油圧式ラッシュアジャスタ３０を示している。このラッシュアジャスタ３０は、先端部分がロッカアーム５０に当節するプランジャ４１と、該プランジャ４１を挿入するシリンダヘッド９の取付部２１に一体形成されたボディとからなる。   1 and 2 show a hydraulic lash adjuster 30 of Embodiment 1 in an internal combustion engine having a plurality of cylinders. The lash adjuster 30 is composed of a plunger 41 whose front end is engaged with the rocker arm 50 and a body integrally formed with the mounting portion 21 of the cylinder head 9 into which the plunger 41 is inserted.

まず、ラッシュアジャスタ周辺の構造について簡単に説明すると、アルミニウム合金等の成形材料によりブロック状に形成されたシリンダヘッド本体１０には、シリンダ内部への吸気又はシリンダ内部からの排気のための複数の通気路１１が形成されるとともに、各通気路１１の壁部にステム孔１３が形成されている。このステム孔１３には通気路１１の通気口１２を開閉するためのバルブ６０が往復動可能に装着され、該バルブ６０を駆動するためロッカアーム５０とカム５５とを含む動弁機構がシリンダヘッド９の上部に設けられている。図示例の動弁機構は、実施例のラッシュアジャスタ３０がロッカアーム５０の基端を支持し、カム５５がロッカアーム５０の中間部を押圧し、ロッカアーム５０の先端がバルブ６０のステム基端を押圧する構造のものである。６１はバルブスプリングである。   First, the structure around the lash adjuster will be briefly described. The cylinder head body 10 formed in a block shape from a molding material such as an aluminum alloy has a plurality of ventilations for intake into the cylinder or exhaust from the cylinder. A passage 11 is formed, and a stem hole 13 is formed in the wall portion of each ventilation passage 11. A valve 60 for opening and closing the vent hole 12 of the vent path 11 is reciprocally mounted in the stem hole 13, and a valve mechanism including a rocker arm 50 and a cam 55 for driving the valve 60 is a cylinder head 9. Is provided at the top. In the illustrated valve operating mechanism, the lash adjuster 30 of the embodiment supports the base end of the rocker arm 50, the cam 55 presses the middle part of the rocker arm 50, and the tip of the rocker arm 50 presses the stem base end of the valve 60. Of structure. 61 is a valve spring.

さて、シリンダヘッド本体１０におけるロッカアーム５０の基端より下方位置には、取付部２１とオイル通路部２５とを一体的に含む突出部分２０が、前記アルミニウム合金等の成形材料により一体形成されている。   Now, at a position below the base end of the rocker arm 50 in the cylinder head body 10, a protruding portion 20 that integrally includes the mounting portion 21 and the oil passage portion 25 is integrally formed of a molding material such as the aluminum alloy. .

取付部２１は、シリンダヘッド９の上面に一体化して上方へ突出する略円柱形状をしており、プランジャ４１の数に対応した数の取付部２１が相互に所定の間隔をおいて設けられている。取付部２１にはその上面から下方に向けて有底の取付孔２２が凹設され、該取付孔２２にラッシュアジャスタ３０のプランジャ４１が挿入されている。すなわち、取付部２１は、ラッシュアジャスタ３０を取り付ける取付部本来の機能以外にも、プランジャ４１の基端部分をハウジングするラッシュアジャスタのボディとしての機能も兼ね備えていて、ボディが取付部に一体形成された構造となっている。   The mounting portion 21 has a substantially cylindrical shape that is integrated with the upper surface of the cylinder head 9 and protrudes upward, and the number of mounting portions 21 corresponding to the number of plungers 41 is provided at a predetermined interval from each other. Yes. A bottomed mounting hole 22 is formed in the mounting portion 21 downward from the upper surface thereof, and the plunger 41 of the lash adjuster 30 is inserted into the mounting hole 22. That is, the attachment portion 21 has a function as a body of a lash adjuster that houses the base end portion of the plunger 41 in addition to the original function of the attachment portion for attaching the lash adjuster 30, and the body is integrally formed with the attachment portion. It has a structure.

そのため、取付部２１の内部において、取付孔２２とこれに挿入されたプランジャ４１との間には、ボディの内部に形成されるべき高圧油室３２と微小クリアランス３４とが形成される。高圧油室３２は、オイルＰを貯蓄し油圧を発生させるためのもので、取付孔２２の底部とプランジャ４１の基端部との間に形成される。微小クリアランス３４は、オイルＰを高圧油室３２からリークさせるためのもので、取付孔２２の内周面とプランジャ４１の外周面との間に形成される。   Therefore, a high-pressure oil chamber 32 and a minute clearance 34 to be formed inside the body are formed between the attachment hole 22 and the plunger 41 inserted in the attachment portion 21 inside the attachment portion 21. The high-pressure oil chamber 32 is for storing oil P and generating hydraulic pressure, and is formed between the bottom of the mounting hole 22 and the base end of the plunger 41. The minute clearance 34 is for leaking the oil P from the high pressure oil chamber 32, and is formed between the inner peripheral surface of the mounting hole 22 and the outer peripheral surface of the plunger 41.

オイル通路部２５は、各取付部２１の側部を連絡するように横方向に一条に延びるとともに、オイル通路部２５の一部が各取付部２１の側部と交わってその一部を取付部２１の側部と共有している。また、オイル通路部２５は、シリンダヘッド９の上面に一体化して上方へ凸条に隆起しており、シリンダヘッド本体９と一体成形するときにアンダーカットにならないよう断面略台形形状をしている。オイル通路部２５の内部にはオイルＰの流れるオイル孔２６が形成され、該オイル孔２６の一部は取付孔２２の一部と交わって取付孔２２への開口２３を形成している。この開口２３から、後述するようにプランジャ４１にオイルＰを供給する。   The oil passage portion 25 extends in one line in the lateral direction so as to communicate with the side portions of the attachment portions 21, and a part of the oil passage portion 25 intersects with the side portions of the attachment portions 21, and a part thereof is attached to the attachment portion Shared with 21 sides. Further, the oil passage portion 25 is integrated with the upper surface of the cylinder head 9 and protrudes upwards in a convex shape, and has a substantially trapezoidal cross section so as not to be undercut when integrally formed with the cylinder head body 9. . An oil hole 26 through which oil P flows is formed inside the oil passage portion 25, and a part of the oil hole 26 intersects with a part of the mounting hole 22 to form an opening 23 to the mounting hole 22. Oil P is supplied from this opening 23 to the plunger 41 as will be described later.

プランジャ４１は、上端の先端部が丸まった略円筒形状をしており、内部にはオイルＰが充填される低圧油室４２が形成される。周壁には環状溝４８とその溝底に開口するオイル供給口４３とが設けられ、前記オイル孔２６からのオイルＰが、前記開口２３から環状溝４８及びオイル供給口４３を経て低圧油室４２に供給される。天井部には混入した空気を逃がす頂孔４４が設けられている。底部には高圧油室３２への連通孔４５が設けられ、該連通孔４５の下側には逆止弁４６が取り付けられており、高圧油室３２の油圧が減少した際に高圧油室３２へオイルＰが流入する。基端と取付孔２２の内底面との間には、プランジャ４１を上方へ付勢して先端部をロッカアーム５０に押し当てるプランジャスプリング４７が介装されている。取付部２１の上縁部にはプランジャ４１の上方への抜けを規制するリテーナ２４が取り付けられている。   The plunger 41 has a substantially cylindrical shape with a rounded upper end, and a low-pressure oil chamber 42 filled with oil P is formed inside. The peripheral wall is provided with an annular groove 48 and an oil supply port 43 that opens to the bottom of the groove. Oil P from the oil hole 26 passes through the annular groove 48 and the oil supply port 43 from the opening 23, and the low pressure oil chamber 42. To be supplied. A top hole 44 is provided in the ceiling portion for releasing mixed air. A communication hole 45 to the high pressure oil chamber 32 is provided at the bottom, and a check valve 46 is attached to the lower side of the communication hole 45. When the hydraulic pressure in the high pressure oil chamber 32 decreases, the high pressure oil chamber 32 is provided. Oil P flows into. A plunger spring 47 is interposed between the base end and the inner bottom surface of the mounting hole 22 to urge the plunger 41 upward and press the distal end against the rocker arm 50. A retainer 24 that restricts the plunger 41 from being pulled upward is attached to the upper edge portion of the attachment portion 21.

本実施例のラッシュアジャスタは、プランジャ４１をハウジングするためのボディ部分が取付部２１に一体形成されているため、該ボディ部分を専用部材として別途用意する必要がない。そのため、部品点数が少ない簡略化された構造になっていると同時に、構造上の重複による無駄も少ない軽量化された構造になっている。   In the lash adjuster of the present embodiment, the body portion for housing the plunger 41 is integrally formed with the mounting portion 21, so that it is not necessary to separately prepare the body portion as a dedicated member. Therefore, it has a simplified structure with a small number of parts, and at the same time has a light weight structure with little waste due to structural overlap.

図３及び図４に示す実施例２は、シリンダヘッド７０の取付部７５とオイル通路部７６とを一体的に含む一部分が、別体部分７４としてシリンダヘッド本体７１と別体に形成され該シリンダヘッド本体７１に取り付けられた点で実施例１と相違し、その他は実施例１と略共通である。   In the second embodiment shown in FIGS. 3 and 4, a part of the cylinder head 70 integrally including the mounting portion 75 and the oil passage portion 76 is formed separately from the cylinder head body 71 as a separate portion 74. The second embodiment is different from the first embodiment in that it is attached to the head main body 71, and the others are substantially the same as the first embodiment.

取付部７５は、略円筒形状をしており、ラッシュアジャスタの数に対応した数の取付部７５が相互に所定の間隔をおいて設けられている。取付部７５にはその上面から下方に向けて有底の取付孔８５が凹設され、該取付孔８５にラッシュアジャスタ８０のプランジャ８１が挿入される。   The attachment portions 75 have a substantially cylindrical shape, and a number of attachment portions 75 corresponding to the number of lash adjusters are provided at predetermined intervals. A bottomed mounting hole 85 is formed in the mounting portion 75 downward from the upper surface thereof, and the plunger 81 of the lash adjuster 80 is inserted into the mounting hole 85.

オイル通路部７６は、円管形状をした一本のものであり、各取付部７５の側部を連絡するように横方向に延びるとともに、オイル通路部７６の一部が各取付部７５の側部と交わってその一部を取付部７５の側部と共有している。オイル通路部７６の内部（中心）にはオイルＰの流れるオイル孔８６が形成され、該オイル孔８６の一部は取付孔８５の一部と交わって取付孔８５への開口８７を形成している。この開口８７から、プランジャ８１にオイルＰを供給する。   The oil passage portion 76 is a single tube-shaped one, and extends in the lateral direction so as to connect the side portions of the mounting portions 75, and a part of the oil passage portion 76 is on the side of each mounting portion 75. A part of the crossing part is shared with the side part of the attachment part 75. An oil hole 86 through which oil P flows is formed in the center (center) of the oil passage portion 76, and a part of the oil hole 86 intersects with a part of the mounting hole 85 to form an opening 87 to the mounting hole 85. Yes. Oil P is supplied to the plunger 81 from the opening 87.

このように、本実施例におけるオイル通路部７６は、オイル孔８６の回りに強度的に必要十分な最小限の肉厚を有する円管形状をなし、従来例及び実施例１と比べると、オイル孔８６よりシリンダヘッド本体７１側の駄肉が省かれている。この駄肉の省きは、各取付部７５間を連絡する部分において顕著であり、オイル通路部７６はシリンダヘッド本体７１の上面から離間し、その間は空間となっている。また、オイル通路部７６が各取付部７５と一部交わった部分の下方の駄肉も省かれている。このため、本実施例２によれば、実施例１の効果に加え、シリンダヘッド９が軽量化される。   As described above, the oil passage portion 76 in the present embodiment has a circular pipe shape having the minimum necessary and sufficient thickness around the oil hole 86, and the oil passage portion 76 is more oily than the conventional example and the first embodiment. The hollow meat on the cylinder head main body 71 side is omitted from the hole 86. The omission of the meat is remarkable in the portion connecting the mounting portions 75, and the oil passage portion 76 is separated from the upper surface of the cylinder head main body 71, and a space is formed between them. Also, the waste meat below the portion where the oil passage portion 76 partially intersects with each attachment portion 75 is omitted. For this reason, according to the second embodiment, in addition to the effects of the first embodiment, the weight of the cylinder head 9 is reduced.

なお、別体部分７４は、取付部７５の下面をシリンダヘッド本体７１の上面に当てるとともに、オイル通路部７６に突設した被保持部７７のネジ通孔７８を、シリンダヘッド本体７１に設けた座部７２のネジ孔７３に合わせてネジ７９で止めることにより、シリンダヘッド本体７１に取り付けられる。   The separate portion 74 has the lower surface of the mounting portion 75 applied to the upper surface of the cylinder head main body 71, and the cylinder head main body 71 has a threaded hole 78 of the held portion 77 protruding from the oil passage portion 76. The cylinder head main body 71 is attached by fixing with a screw 79 in accordance with the screw hole 73 of the seat 72.

なお、本発明は前記実施例に限定されるものではなく、発明の趣旨から逸脱しない範囲で適宜変更して具体化することもできる。   In addition, this invention is not limited to the said Example, In the range which does not deviate from the meaning of invention, it can change suitably and can be actualized.

本発明の実施例１のラッシュアジャスタ、シリンダヘッド及びその周辺部材を分解して示す斜視図である。It is a perspective view which decomposes | disassembles and shows the lash adjuster, cylinder head, and its peripheral member of Example 1 of this invention. 同実施例の断面図である。It is sectional drawing of the Example. 本発明の実施例２のラッシュアジャスタ、シリンダヘッド及びその周辺部材を分解して示す斜視図である。It is a perspective view which decomposes | disassembles and shows the lash adjuster, cylinder head, and its peripheral member of Example 2 of this invention. 同実施例の断面図である。It is sectional drawing of the Example. 従来例のラッシュアジャスタ、シリンダヘッド及びその周辺部材を示す断面図である。It is sectional drawing which shows the lash adjuster of a prior art example, a cylinder head, and its peripheral member.

符号の説明Explanation of symbols

９ シリンダヘッド
２１ 取付部
３０ ラッシュアジャスタ
４１ プランジャ
５０ ロッカアーム 9 Cylinder head 21 Mounting part 30 Rush adjuster 41 Plunger 50 Rocker arm

Claims (1)

先端部分がロッカアームに当接するプランジャと、前記プランジャの基端部分をハウジングするボディとを含み、シリンダヘッドの取付部に取り付けられるラッシュアジャスタにおいて、前記ボディが前記シリンダヘッドの取付部に一体形成されたことを特徴とするラッシュアジャスタ。   In a lash adjuster that is attached to a cylinder head attachment portion, the body is formed integrally with the cylinder head attachment portion. The lash adjuster is attached to a cylinder head attachment portion. Rush adjuster characterized by that.
JP2004353223A 2004-12-06 2004-12-06 Rush adjuster Expired - Fee Related JP4420803B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2004353223A JP4420803B2 (en) 2004-12-06 2004-12-06 Rush adjuster

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2004353223A JP4420803B2 (en) 2004-12-06 2004-12-06 Rush adjuster

Publications (2)

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JP2006161655A true JP2006161655A (en) 2006-06-22
JP4420803B2 JP4420803B2 (en) 2010-02-24

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010216293A (en) * 2009-03-13 2010-09-30 Toyota Motor Corp Valve gear of internal combustion engine
JP2014077435A (en) * 2012-09-24 2014-05-01 Honda Motor Co Ltd Assembly method and assembly device for direct-injector unit
JP2015059484A (en) * 2013-09-18 2015-03-30 マツダ株式会社 Structure of cylinder head of engine and its manufacturing method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010216293A (en) * 2009-03-13 2010-09-30 Toyota Motor Corp Valve gear of internal combustion engine
JP2014077435A (en) * 2012-09-24 2014-05-01 Honda Motor Co Ltd Assembly method and assembly device for direct-injector unit
JP2015059484A (en) * 2013-09-18 2015-03-30 マツダ株式会社 Structure of cylinder head of engine and its manufacturing method

Also Published As

Publication number Publication date
JP4420803B2 (en) 2010-02-24

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