JPH06193411A - Hydraulic lash adjuster - Google Patents
Hydraulic lash adjusterInfo
- Publication number
- JPH06193411A JPH06193411A JP34772992A JP34772992A JPH06193411A JP H06193411 A JPH06193411 A JP H06193411A JP 34772992 A JP34772992 A JP 34772992A JP 34772992 A JP34772992 A JP 34772992A JP H06193411 A JPH06193411 A JP H06193411A
- Authority
- JP
- Japan
- Prior art keywords
- reservoir
- hole
- lash adjuster
- lining member
- oil
- 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.)
- Granted
Links
- 238000003780 insertion Methods 0.000 claims abstract description 5
- 230000037431 insertion Effects 0.000 claims abstract description 5
- 238000002485 combustion reaction Methods 0.000 abstract description 10
- 238000005266 casting Methods 0.000 abstract description 9
- 238000009434 installation Methods 0.000 abstract 3
- 238000009751 slip forming Methods 0.000 abstract 1
- 238000000638 solvent extraction Methods 0.000 abstract 1
- 239000011800 void material Substances 0.000 description 8
- 230000002093 peripheral effect Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は内燃機関の動弁機構にお
いて、弁の間隙を自動的に補正する油圧式ラッシュアジ
ャスタに係り、特にロッカアームに内蔵される構造の油
圧式ラッシュアジャスタに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic lash adjuster for automatically correcting a valve clearance in a valve train of an internal combustion engine, and more particularly to a hydraulic lash adjuster having a structure incorporated in a rocker arm.
【０００２】[0002]
【従来技術】内燃機関における動弁機構は一般に摩耗や
熱膨張の影響を受け易く、弁間隙が運転中に変化するの
で、この間隙を適切に補正するべく油圧式ラッシュアジ
ャスタが用いられている。図７に示す符号１は、カム２
の回転に連係してロッカアーム３が揺動し、これに伴っ
てバルブ４が開閉動作する動弁機構を示しており、ロッ
カアーム３の揺動先端部に油圧式ラッシュアジャスタが
内蔵されている。符号８はロッカアーム３に形成された
ラッシュアジャスタ取付孔で、この孔８にラッシュアジ
ャスタ本体１０（以下、アジャスタ本体という）が挿着
されている。2. Description of the Related Art Generally, a valve train in an internal combustion engine is easily affected by wear and thermal expansion, and the valve clearance changes during operation. Therefore, a hydraulic lash adjuster is used to appropriately correct this clearance. Reference numeral 1 shown in FIG.
The rocker arm 3 swings in association with the rotation of the rocker arm 3, and the valve 4 opens and closes accordingly. A rocking adjuster has a built-in hydraulic lash adjuster. Reference numeral 8 is a lash adjuster mounting hole formed in the rocker arm 3, and a lash adjuster main body 10 (hereinafter referred to as an adjuster main body) is inserted into the hole 8.
【０００３】アジャスタ本体１０は、図８にその構造が
開示されているように、円筒型のボディ１２と、このボ
ディ１２内に上下方向摺動可能に組付けられ、バルブス
テム上端部４ａに当接するプランジャ１４とからなる。
取付孔８には、ロッカアーム３に形成されているオイル
供給路１６に連通するリザーバ形成孔９が連成されてお
り、リザーバ形成孔９にはチャンバと呼ばれるキャップ
型の内張部材３０が挿着されている。内張部材３０の内
部は、オイル供給孔である小孔３３を介しオイル供給路
１６に連通するとともに、小孔３４を介しボディ１２と
プランジャ１４により画成される高圧室１８にも連通し
て、内張部材３０内に、オイル供給路１６から供給され
る作動オイルを貯溜するリザーバ２０が形成されてい
る。そしてカム２の回転によりボディ１２がプランジャ
１４に押圧され高圧室１８内のオイルの圧力が高くなる
と、高圧室１８内のチェックボール３６が小孔３４を閉
塞し、プランジャ１４がロック状態となる。そしてカム
ノーズ２ａがロッカアーム３を押圧することによってロ
ッカアーム３が揺動し、バルブ４が復帰スプリング５に
抗して摺動し開弁する。その後、カム２の回動により、
バルブ４は復帰スプリング５の作用により閉弁する。符
号１３はプランジャスプリングで、プランジャ１４はこ
のプランジャスプリング１３によってロッカアーム３に
常に当接する状態に保持されており、熱変形等の原因に
よって発生した動弁系の隙間を零とするよう補正動作す
るものである。なお符号３５はリザーバ２０内のオイル
の溢出孔、符号３７はボールケージ、符号３８はチェッ
クボールスプリングである。The adjuster main body 10 has a cylindrical body 12 and a vertically slidable assembly in the body 12 as shown in FIG. It consists of the plunger 14 which contacts.
A reservoir forming hole 9 that communicates with an oil supply passage 16 formed in the rocker arm 3 is formed in the mounting hole 8, and a cap-type lining member 30 called a chamber is inserted into the reservoir forming hole 9. Has been done. The inside of the lining member 30 communicates with the oil supply passage 16 via a small hole 33 which is an oil supply hole, and also communicates with the high pressure chamber 18 defined by the body 12 and the plunger 14 via a small hole 34. A reservoir 20 that stores the working oil supplied from the oil supply passage 16 is formed in the lining member 30. When the body 12 is pressed by the plunger 14 by the rotation of the cam 2 and the pressure of the oil in the high pressure chamber 18 increases, the check ball 36 in the high pressure chamber 18 closes the small hole 34, and the plunger 14 is locked. Then, the cam nose 2a pushes the rocker arm 3 to swing the rocker arm 3, and the valve 4 slides against the return spring 5 to open the valve. After that, by turning the cam 2,
The valve 4 is closed by the action of the return spring 5. Reference numeral 13 is a plunger spring, and the plunger 14 is held by the plunger spring 13 so as to be always in contact with the rocker arm 3, and performs a correction operation so as to make a gap in the valve train generated by a cause such as thermal deformation to be zero. Is. Reference numeral 35 is an oil overflow hole in the reservoir 20, reference numeral 37 is a ball cage, and reference numeral 38 is a check ball spring.
【０００４】[0004]
【発明の解決しようとする課題】ロッカアーム３は、例
えばアルミダイキャスト製であり、製品の中には符号Ｈ
で示すように鋳物鬆や疵が生じているものもある。そし
てオイル供給路１６からリザーバ形成孔９にかけて鋳物
鬆や疵Ｈがあると、内燃機関の停止時にリザーバ２０内
のオイルがこの鋳物鬆や疵Ｈを通ってオイル供給路１６
側に漏れてリザーバ２０内のオイル液面が低下し、即ち
リザーバ２０内にエアーが侵入する。そして、再び高速
運転をしたり再始動した時等に高圧室１８にエアーを吸
込み、ラッシュアジャスタが適正に弁間隙調整を行えな
くなるとか、バルブ１４の衝打音が発生する等の問題が
生じるおそれがある。The rocker arm 3 is made of, for example, aluminum die-cast, and has a symbol H in some products.
As shown in, there are some that have found voids or defects. If there is a casting void or flaw H from the oil supply passage 16 to the reservoir forming hole 9, the oil in the reservoir 20 will pass through the casting void or flaw H and the oil supply passage 16 when the internal combustion engine is stopped.
Leaks to the side and the oil level in the reservoir 20 lowers, that is, air enters the reservoir 20. Then, when high-speed operation is performed again or restart is performed, air may be sucked into the high pressure chamber 18, and the lash adjuster may not be able to properly adjust the valve clearance, or a problem may occur such as an impact sound of the valve 14. There is.
【０００５】そこで従来では、リザーバ形成孔９内に内
張部材３０を挿着し、この内張部材３０によってリザー
バ２０を画成して、機関停止時等における鋳物鬆や疵Ｈ
等を介してのオイルの漏出を防止しようとしているが、
リザーバ２０内のオイルは内張部材３０とボディ１２間
の隙間ｃを介して内張部材３０の外側に漏れるため、内
張部材３０がリザーバ２０内のオイルの漏れを確実に防
止するまでには至っていない。Therefore, conventionally, the lining member 30 is inserted into the reservoir forming hole 9 and the reservoir 20 is defined by the lining member 30, so that a casting hole or a defect H is generated when the engine is stopped.
I'm trying to prevent the oil from leaking through
Since the oil in the reservoir 20 leaks to the outside of the lining member 30 through the gap c between the lining member 30 and the body 12, it is necessary for the lining member 30 to reliably prevent the oil in the reservoir 20 from leaking. I haven't arrived.
【０００６】本発明は前記従来技術の問題点に鑑みなさ
れたもので、その目的は、リザーバの液密性を確保する
ことによりリザーバとオイル供給路間に鋳物鬆や疵が存
在したとしてもこれらの鋳物鬆や疵からリザーバ内のオ
イルが漏出することのない油圧式ラッシュアジャスタを
提供することにある。The present invention has been made in view of the above-mentioned problems of the prior art, and an object thereof is to ensure the liquid tightness of the reservoir even if there is a casting void or a flaw between the reservoir and the oil supply passage. Another object of the present invention is to provide a hydraulic lash adjuster in which the oil in the reservoir does not leak from the casting void or flaw.
【０００７】[0007]
【課題を解決するための手段】前記目的を達成するため
に、請求項１に係る油圧式ラッシュアジャスタにおいて
は、直列に連成されたリザーバー形成孔を持つラッシュ
アジャスタ取付孔に円筒型のボディが挿着されるととも
に、前記ボディにはバルブステム上端部に当接する摺動
プランジャが挿着され、前記リザーバ形成孔には側面に
オイル供給孔が設けられたキャップ型の内張部材が挿着
されて、内張部材とボディ上端部により、ロッカアーム
内のオイル供給路を介して供給されたオイルを貯溜する
リザーバが画成され、ボディとプランジャにより、前記
リザーバに小孔を介して連通し、この小孔を閉塞動作す
るチェックボールを収容した高圧室が画成され、カムの
回転に連係して揺動するロッカアームのバルブステム当
接部に内蔵された油圧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取付孔に、ボディの挿着される
円筒型の内張部材を挿着し、リザーバ形成孔に挿着した
内張部材とラッシュアジャスタ取付孔に挿着した内張部
材との付合わせ部を液密封止するようにしたものであ
る。To achieve the above object, in a hydraulic lash adjuster according to a first aspect of the present invention, a cylindrical body is provided in a lash adjuster mounting hole having a reservoir forming hole connected in series. A sliding plunger that contacts the upper end of the valve stem is inserted into the body, and a cap-type lining member having an oil supply hole on the side surface is inserted into the reservoir forming hole. The lining member and the upper end of the body define a reservoir for storing the oil supplied through the oil supply passage in the rocker arm, and the body and the plunger communicate with the reservoir through the small hole. A high-pressure chamber containing a check ball that closes the small hole is defined, and is built in the valve stem contact part of the rocker arm that swings in conjunction with the rotation of the cam. In the pressure-lash adjuster,
A cylindrical lining member into which the body is inserted is inserted into the lash adjuster mounting hole, and the lining member inserted into the reservoir forming hole and the lining member inserted into the lash adjuster mounting hole are attached together. The part is liquid-tightly sealed.
【０００８】また請求項２に係る油圧式ラッシュアジャ
スタにおいては、直列に連成されたリザーバー形成孔を
持つラッシュアジャスタ取付孔に円筒型のボディが挿着
されるとともに、前記ボディにはバルブステム上端部に
当接する摺動プランジャが挿着され、前記リザーバ形成
孔には側面にオイル供給孔が設けられたキャップ型の内
張部材が挿着されて、内張部材とボディ上端部により、
ロッカアーム内のオイル供給路を介して供給されたオイ
ルを貯溜するリザーバが画成され、ボディとプランジャ
により、前記リザーバに小孔を介して連通し、この小孔
を閉塞動作するチェックボールを収容した高圧室が画成
され、カムの回転に連係して揺動するロッカアームのバ
ルブステム当接部に内蔵された油圧式ラッシュアジャス
タにおいて、前記内張部材に、ラッシュアジャスタ取付
孔に挿着してボディ収容室を画成する円筒型のラッシュ
アジャスタ取付孔挿着領域を一体形成するようにしたも
のである。Further, in the hydraulic lash adjuster according to the second aspect, a cylindrical body is inserted into a lash adjuster mounting hole having a reservoir forming hole connected in series, and a valve stem upper end is attached to the body. A sliding plunger abutting on the portion is inserted, and a cap-type lining member having an oil supply hole on the side surface is inserted into the reservoir forming hole, and by the lining member and the upper end of the body,
A reservoir for storing the oil supplied through the oil supply passage in the rocker arm is defined, and the body and the plunger communicate with the reservoir through the small hole, and the check ball for closing the small hole is housed. In a hydraulic lash adjuster built in a valve stem abutting part of a rocker arm that defines a high-pressure chamber and swings in conjunction with the rotation of a cam, the lash adjuster mounting hole is inserted into the lining member and attached to the body. The cylindrical lash adjuster mounting hole insertion area that defines the accommodation chamber is integrally formed.
【０００９】[0009]
【作用】リザーバ形成孔からラッシュアジャスタ取付孔
にかけては、請求項１ではリザーバ形成孔に挿着された
内張部材とラッシュアジャスタ取付孔に挿着された内張
部材の付合わせ部が液密封止され、請求項２では単一の
キャップ型の内張部材により内張りされているので、リ
ザーバ形成孔およびラッシュアジャスタ取付孔の内周面
にリザーバ内のオイルが漏れ出ることがなく、たとえリ
ザーバ形成孔とオイル供給路間に鋳物鬆や疵が存在して
いても、リザーバ内のオイルがこれらの鬆や疵を介して
オイル供給路に漏れ出ることがない。According to the first aspect of the invention, the contact portion between the lining member inserted into the reservoir forming hole and the lining member inserted into the lash adjuster attaching hole is liquid-tightly sealed from the reservoir forming hole to the lash adjuster attaching hole. According to the present invention, since the inner wall of the reservoir forming hole and the lash adjuster mounting hole is not spilled, the oil in the reservoir does not leak out because it is lined with a single cap-type lining member. Even if there is a casting void or a flaw between the oil supply passage and the oil supply passage, the oil in the reservoir does not leak to the oil supply passage through the void or the flaw.
【００１０】[0010]
【実施例】次に、本発明の実施例を図面に基づいて説明
する。図１及び図２は本発明を適用した内燃機関用動弁
機構を示し、図１は同動弁機構の断面図、図２は第１の
実施例である油圧ラッシュアジャスタの拡大断面図であ
る。Embodiments of the present invention will now be described with reference to the drawings. 1 and 2 show a valve operating mechanism for an internal combustion engine to which the present invention is applied, FIG. 1 is a sectional view of the valve operating mechanism, and FIG. 2 is an enlarged sectional view of a hydraulic lash adjuster according to a first embodiment. .
【００１１】これらの図において、動弁機構１は、内燃
機関のクランクシャフトに軸着されたカム２と、カム２
の回動に連係して揺動するロッカアーム３と、上下方向
に摺動してシリンダに形成されている吸排ポートＰを開
閉するバルブ４と、ロッカアーム３に内蔵された油圧ラ
ッシュアジャスタ１０Ａとから構成されているが、油圧
ラッシュアジャスタ１０Ａの構造を除いて従来技術にお
ける動弁機構の構造（図７参照）と同一であるため、油
圧ラッシュアジャスタ１０Ａにつき詳述し、その他の動
弁機構構成部材については同一の符号を付すことにより
その説明を省略する。In these drawings, a valve mechanism 1 includes a cam 2 axially mounted on a crankshaft of an internal combustion engine, and a cam 2
The rocker arm 3 swings in association with the rotation of the cylinder, a valve 4 that slides in the vertical direction to open and close the intake / exhaust port P formed in the cylinder, and a hydraulic lash adjuster 10A built in the rocker arm 3. However, except for the structure of the hydraulic lash adjuster 10A, it is the same as the structure of the valve operating mechanism in the prior art (see FIG. 7), so the hydraulic lash adjuster 10A will be described in detail and other valve operating mechanism constituent members will be described. Are denoted by the same reference numerals and the description thereof will be omitted.
【００１２】油圧ラッシュアジャスタ１０Ａは、ロッカ
アーム３に形成されたラッシュアジャスタ取付孔８に収
容された筒型のボディ１２とこのボディ１２に摺動可能
に組付られたプランジャ１４とにより形成された高圧室
１８と、ロッカアーム３内に形成されたオイル供給路１
６と連通するとともに、小孔３４を介し前記高圧室１８
に連通するリザーバ２０と、前記高圧室１８内に収容さ
れてリザーバ２０に連通する小孔３４を開閉するべく動
作するチェックボール３６とから主として構成されてい
る。The hydraulic lash adjuster 10A is a high pressure formed by a cylindrical body 12 housed in a lash adjuster mounting hole 8 formed in the rocker arm 3 and a plunger 14 slidably mounted in the body 12. The chamber 18 and the oil supply passage 1 formed in the rocker arm 3
6 and the high pressure chamber 18 through the small hole 34.
And a check ball 36 which is housed in the high pressure chamber 18 and operates to open and close a small hole 34 which communicates with the reservoir 20.
【００１３】リザーバ２０は、リザーバ形成孔９とラッ
シュアジャスタ取付孔８とからなる段付き孔に挿着され
て、孔内周面に密着する段付きキャップ型の内張部材３
０Ａの小径部３１によって形成されており、内張部材３
０Ａの大径部３２にはボディ収容室が形成され、ここに
ボディ１２が収容されている。符号３３は内張部材３０
Ａの小径部３１に穿設されたオイル供給孔である小孔
で、この小孔３３を介してオイル供給路１６からリザー
バ２０内にオイルが供給される。符号３５は内張部材の
天井面に穿設された小孔で、リザーバ２０内のオイルの
溢出孔として作用する。符号４４はボディ１２と内張部
材３０Ａ間をシールするＯリングである。The reservoir 20 is inserted into a stepped hole consisting of the reservoir forming hole 9 and the lash adjuster mounting hole 8 and is in contact with the inner peripheral surface of the hole.
It is formed by the small diameter portion 31 of 0 A, and the lining member 3
A body accommodating chamber is formed in the large diameter portion 32 of 0A, and the body 12 is accommodated therein. Reference numeral 33 is the lining member 30.
It is a small hole which is an oil supply hole formed in the small diameter portion 31 of A, and oil is supplied from the oil supply passage 16 into the reservoir 20 through the small hole 33. Reference numeral 35 is a small hole formed in the ceiling surface of the lining member, and acts as an overflow hole for oil in the reservoir 20. Reference numeral 44 is an O-ring that seals between the body 12 and the lining member 30A.
【００１４】内張部材３０Ａの小径部３１及び大径部３
２はロッカアーム３のラッシュアジャスタ取付孔８，リ
ザーバ形成孔９の孔径にそれぞれ整合する形状に形成さ
れており、内張部材３０Ａを孔に圧入挿着することによ
り内張部材３０Ａと孔８，９の内周面間が液密状態とさ
れ、孔８，９と内張部材３０Ａ間がシールされてオイル
が両者間の密着面から流出しない構造となっている。The small diameter portion 31 and the large diameter portion 3 of the lining member 30A
2 is formed in a shape that matches the hole diameters of the lash adjuster mounting hole 8 and the reservoir forming hole 9 of the rocker arm 3, respectively, and the lining member 30A and the holes 8 and 9 are formed by press-fitting the lining member 30A into the holes. The inner peripheral surfaces are liquid-tight, and the holes 8 and 9 and the lining member 30A are sealed so that oil does not flow out from the contact surface between them.
【００１５】その他は従来のラッシュアジャスタ（図８
参照）と同一構造であり、同一の符号を付すことにより
その説明は省略する。この様に本実施例では、ラッシュ
アジャスタ取付孔８，リザーバ形成孔９とリザーバ２０
とが内張部材３０Ａによって完全に隔離されているた
め、たとえオイル供給路１６とリザーバ形成孔９間に鋳
物鬆や疵が存在したとしても、リザーバ２０内のオイル
がリザーバ形成孔９の内周面側に漏れ出すおそれが全く
ない。従って高速運転後のアイドリング時や機関停止時
にリザーバ２０内の液面が低下せず、よって運転再開の
際に高圧室１８にエアーを吸うというおそれが全くな
い。Others are conventional lash adjusters (see FIG. 8).
The same structure as that of the reference) and the description thereof will be omitted by giving the same reference numerals. Thus, in this embodiment, the lash adjuster mounting hole 8, the reservoir forming hole 9 and the reservoir 20 are provided.
Are completely separated by the lining member 30A, the oil in the reservoir 20 is kept in the inner circumference of the reservoir forming hole 9 even if a casting void or a flaw is present between the oil supply passage 16 and the reservoir forming hole 9. There is no danger of leaking to the surface side. Therefore, the liquid level in the reservoir 20 does not drop when idling after high-speed operation or when the engine is stopped, and there is no fear of sucking air into the high-pressure chamber 18 when restarting operation.
【００１６】なお内張部材３０Ａとボディ１２との間に
介在させたＯリング４４に代え、ボディ１２を内張部材
３０Ａに圧入して両者（１２，３０Ａ）間を液密状態と
するようにしてもよい。また内張部材３０Ａを圧入挿着
することなく、鋳ぐるみや接着剤により接着する構造で
あってもよい。図３は本発明の第２の実施例である油圧
ラッシュアジャスタを示し、内張部材３０Ｂはラッシュ
アジャスタ取付孔８，リザーバ形成孔９に圧入されるこ
となく挿着されており、内張部材３０Ｂと孔８，９の内
周面間にＯリング４２が介装されて両者間がシールされ
ている。In place of the O-ring 44 interposed between the lining member 30A and the body 12, the body 12 is press-fitted into the lining member 30A so that the space between the two (12, 30A) becomes liquid-tight. May be. Further, the structure may be such that the lining member 30A is adhered by a cast gurney or an adhesive without press-fitting and inserting. FIG. 3 shows a hydraulic lash adjuster according to a second embodiment of the present invention, in which the lining member 30B is inserted into the lash adjuster mounting hole 8 and the reservoir forming hole 9 without being press-fitted, and the lining member 30B. An O-ring 42 is interposed between the inner peripheral surfaces of the holes 8 and 9 to seal the two.
【００１７】また内張部材３０Ｂには２個のオイル供給
用の小孔３３，３３が設けられると共に、リザーバ形成
孔９の内周面には、オイル供給路１６のリザーバ形成孔
側開口部を含む位置に帯状のオイル通路１７が周設され
て、リザーバ２０にオイルがスムーズに供給される様に
なっている。また符号４０は内張部材３０Ｂの抜け止め
用のスナップリングである。Further, the lining member 30B is provided with two small holes 33, 33 for supplying oil, and the reservoir forming hole 9 has an opening formed on the inner peripheral surface of the reservoir forming hole 9 on the reservoir forming hole side. A band-shaped oil passage 17 is provided around the position where the oil is contained so that oil can be smoothly supplied to the reservoir 20. Reference numeral 40 is a snap ring for preventing the lining member 30B from coming off.
【００１８】図４は本発明の第３の実施例である油圧式
ラッシュアジャスタの拡大断面図を示している。図４に
示す実施例では、リザーバ形成孔９の上部が天井壁９ａ
によって閉塞されるとともに、内張部材３０Ｃの上端部
が開口し、内張り部材上端部と天井壁９ａ間に内張部材
３０Ｃの上端開口部を閉塞する天板プレート３２が介在
された構造となっている。符号３５ａ，３５ｂは天井壁
９ａ，天板プレート３２にそれぞれ形成されたオイル溢
出孔である。なお天板プレート３２を設けず、内張部材
３０Ｃの上端部を天井壁９ａに直接当接させる構造とし
てもよい。FIG. 4 shows an enlarged sectional view of a hydraulic lash adjuster according to a third embodiment of the present invention. In the embodiment shown in FIG. 4, the upper part of the reservoir forming hole 9 is the ceiling wall 9a.
The upper plate of the lining member 30C is opened, and the top plate 32 for closing the upper end opening of the lining member 30C is interposed between the upper end of the lining member and the ceiling wall 9a. There is. Reference numerals 35a and 35b are oil overflow holes formed in the ceiling wall 9a and the top plate 32, respectively. The top plate 32 may not be provided, and the upper end of the lining member 30C may be brought into direct contact with the ceiling wall 9a.
【００１９】図５は本発明の第４の実施例である油圧式
ラッシュアジャスタの拡大断面図である。この実施例で
は、オイル供給孔（小孔）３３がオイル供給路１６の反
対側に設けられ、かつオイル供給路１６と小孔３３との
間にオイル通路１６が設けられて、リザーバ２０内に勢
いよくオイルが供給されることによるリザーバ２０内で
の撹拌現象の発生を防ぐ構造となってる。即ち、図２に
示すように、オイル供給路１６側に小孔３３が設けられ
ている場合には、オイルはリザーバ２０内に勢いよく供
給されてリザーバ内のオイルが撹拌される。このためリ
ザーバ２０内の空気混入率の高いオイルが高圧室１８内
に入り易く、それだけ高圧室１８内に空気が侵入し易
い。しかるに本実施例では、リザーバ２０内のオイルが
撹拌されないため、それだけ高圧室１８に空気が侵入し
にくい。FIG. 5 is an enlarged sectional view of a hydraulic lash adjuster according to a fourth embodiment of the present invention. In this embodiment, the oil supply hole (small hole) 33 is provided on the opposite side of the oil supply passage 16, and the oil passage 16 is provided between the oil supply passage 16 and the small hole 33, so that the reservoir 20 is provided in the reservoir 20. The structure prevents the occurrence of the stirring phenomenon in the reservoir 20 due to the vigorous supply of oil. That is, as shown in FIG. 2, when the small hole 33 is provided on the oil supply path 16 side, the oil is vigorously supplied into the reservoir 20 and the oil in the reservoir is agitated. Therefore, oil with a high air mixing ratio in the reservoir 20 easily enters the high-pressure chamber 18, and the air easily enters the high-pressure chamber 18 accordingly. However, in this embodiment, the oil in the reservoir 20 is not agitated, so that the air is less likely to enter the high pressure chamber 18.
【００２０】また本実施例では、オイル供給孔（小孔）
３３がオイル供給路１６の反対側であって、リザーバ２
０の上部位置に設けられているため、オイル供給孔（小
孔）３３を上方位置となるようにラッシュアジャスタを
傾斜して配設した場合には、内燃機関の停止時におい
て、オイル供給路１６側に小孔３３が位置する場合に比
べてリザーバ２０内の液面を高い位置に保持でき、即ち
リザーバ２０内に多くのオイルを保持でき、ひいてはそ
れだけ高圧室１８に空気が侵入しにくい構造といえる。
その他は図２に示すラッシュアジャスタの構造と同一で
ある。In this embodiment, the oil supply hole (small hole)
33 is the opposite side of the oil supply passage 16
Since the oil supply hole (small hole) 33 is arranged so as to be inclined so that the oil supply hole (small hole) 33 is located at the upper position, the oil supply passage 16 can be stopped when the internal combustion engine is stopped. As compared with the case where the small hole 33 is located on the side, the liquid level in the reservoir 20 can be maintained at a higher position, that is, more oil can be retained in the reservoir 20, and accordingly, the air is less likely to enter the high pressure chamber 18. I can say.
Others are the same as the structure of the lash adjuster shown in FIG.
【００２１】図６は本発明の第５の実施例である油圧ラ
ッシュアジャスタの拡大断面図を示す。この実施例にお
ける内張部材３０Ｅは、リザーバ形成孔９に挿着されて
リザーバ２０を画成するキャップ型の第１の内張部材３
０Ｅ1と、ラッシュアジャスタ取付孔８に挿着されてボ
ディ１２の収容されるボディ収容室を画成する円筒型の
第２の内張部材３０Ｅ2とから構成されている。第２の
内張部材３０Ｅ2の小径上端部は第１の内張部材３０Ｅ1
内に挿通され、挿通係合部には、Ｏリング４６が介装さ
れて、挿通係合部が液密状態に封止されている。その他
は前記した実施例と同一であり、同一の符号を付すこと
によりその説明は省略する。FIG. 6 is an enlarged sectional view of a hydraulic lash adjuster which is a fifth embodiment of the present invention. The lining member 30E in this embodiment is a cap-type first lining member 3 that is inserted into the reservoir forming hole 9 to define the reservoir 20.
0E 1 and a cylindrical second lining member 30E 2 which is inserted into the lash adjuster mounting hole 8 and defines a body accommodating chamber in which the body 12 is accommodated. The small-diameter upper end of the second lining member 30E 2 is the first lining member 30E 1
An O-ring 46 is inserted in the insertion engaging portion, and the insertion engaging portion is sealed in a liquid-tight state. The other points are the same as those in the above-mentioned embodiment, and the description thereof will be omitted by giving the same reference numerals.
【００２２】[0022]
【発明の効果】以上の説明から明らかなように、請求項
１に係る油圧式ラッシュアジャスタによれば、リザーバ
取付孔に挿着された内張部材とラッシュアジャスタ取付
孔に挿着された内張部材間の付合せ部が液密状態とされ
て、また請求項２では、リザーバ形成孔からラッシュア
ジャスタ取付孔にかけては単一のキャップ型の内張部材
により内張りされて、それぞれリザーバ内とリザーバ形
成孔内周面とが確実に隔離されているため、たとえリザ
ーバ形成孔とオイル供給路間に鋳物鬆や疵があっても、
鋳物鬆や疵らを通してリザーバ内のオイルがオイル供給
路に漏れ出ることはない。このため内燃機関の停止時に
リザーバ内のオイル量が低下せず、従って機関を高速運
転したり機関を再始動した時に高圧室にエアーを吸い込
むという従来の不具合が解消される。As is apparent from the above description, according to the hydraulic lash adjuster according to the first aspect, the lining member inserted into the reservoir mounting hole and the lining member inserted into the lash adjuster mounting hole. The associating portion between the members is made liquid-tight, and in the second aspect, the reservoir forming hole and the lash adjuster mounting hole are lined with a single cap-type lining member to respectively form a reservoir and a reservoir. Since the inner surface of the hole is reliably separated, even if there is a casting void or a flaw between the reservoir forming hole and the oil supply passage,
The oil in the reservoir does not leak to the oil supply passage through the foundry or flaws. Therefore, the amount of oil in the reservoir does not decrease when the internal combustion engine is stopped, so that the conventional problem of sucking air into the high pressure chamber when the engine is operated at high speed or restarted is solved.
【図１】本発明を適用した内燃機関用動弁機構の断面図FIG. 1 is a sectional view of a valve train for an internal combustion engine to which the present invention is applied.
【図２】本発明の第１の実施例である油圧式ラッシュア
ジャスタの拡大断面図FIG. 2 is an enlarged sectional view of a hydraulic lash adjuster according to a first embodiment of the present invention.
【図３】本発明の第２の実施例である油圧式ラッシュア
ジャスタの拡大断面図FIG. 3 is an enlarged sectional view of a hydraulic lash adjuster according to a second embodiment of the present invention.
【図４】本発明の第３の実施例である油圧式ラッシュア
ジャスタの拡大断面図FIG. 4 is an enlarged sectional view of a hydraulic lash adjuster which is a third embodiment of the present invention.
【図５】本発明の第４の実施例である油圧式ラッシュア
ジャスタの拡大断面図FIG. 5 is an enlarged sectional view of a hydraulic lash adjuster according to a fourth embodiment of the present invention.
【図６】本発明の第５の実施例である油圧式ラッシュア
ジャスタの拡大断面図FIG. 6 is an enlarged sectional view of a hydraulic lash adjuster that is a fifth embodiment of the present invention.
【図７】従来の内燃機関用動弁機構の断面図FIG. 7 is a sectional view of a conventional valve operating mechanism for an internal combustion engine.
【図８】同動弁機構に内蔵されてる油圧式ラッシュアジ
ャスタの拡大断面図FIG. 8 is an enlarged cross-sectional view of a hydraulic lash adjuster incorporated in the valve drive mechanism.
２ カム ３ ロッカアーム ４ バルブ ４ａ バルブステム上端部 ８ ラッシュアジャスタ取付孔 ９ リザーバ形成孔 １２ 円筒型ボディ １４ プランジャ １６ オイル供給路 １８ 高圧室 ２０ リザーバ ３６ チェックボール ３３ 小孔（オイル供給孔） ３０Ａ，３０Ｂ，３０Ｃ，３０Ｄ，３０Ｅ（３０Ｅ1，
３０Ｅ2） 内張部材 ３１ 内張部材小径部 ３２ 内張部材大径部2 cam 3 rocker arm 4 valve 4a valve stem upper end 8 lash adjuster mounting hole 9 reservoir forming hole 12 cylindrical body 14 plunger 16 oil supply path 18 high pressure chamber 20 reservoir 36 check ball 33 small hole (oil supply hole) 30A, 30B, 30C, 30D, 30E (30E 1 ,
30E 2 ) Liner member 31 Liner member small diameter part 32 Liner member large diameter part
Claims (2)
つラッシュアジャスタ取付孔に円筒型のボディが挿着さ
れるとともに、前記ボディにはバルブステム上端部に当
接する摺動プランジャが挿着され、前記リザーバ形成孔
には側面にオイル供給孔が設けられたキャップ型の内張
部材が挿着されて、内張部材とボディ上端部により、ロ
ッカアーム内のオイル供給路を介して供給されたオイル
を貯溜するリザーバが画成され、ボディとプランジャに
より、前記リザーバに小孔を介して連通し、この小孔を
閉塞動作するチェックボールを収容した高圧室が画成さ
れ、カムの回転に連係して揺動するロッカアームのバル
ブステム当接部に内蔵された油圧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取付孔には、ボディ
の挿着される円筒型の内張部材が挿着され、リザーバ形
成孔に挿着された内張部材とラッシュアジャスタ取付孔
に挿着された内張部材との付合わせ部が液密封止された
ことを特徴とする油圧式ラッシュアジャスタ。1. A cylindrical body is inserted into a lash adjuster attachment hole having a reservoir forming hole connected in series, and a sliding plunger abutting against an upper end of a valve stem is inserted into the body. A cap-type lining member having an oil supply hole on the side surface is inserted into the reservoir forming hole, and the oil supplied by the lining member and the upper end of the body is supplied through the oil supply passage in the rocker arm. A reservoir for storing the pressure is defined, and a body and a plunger communicate with the reservoir through a small hole, and a high-pressure chamber containing a check ball that closes the small hole is defined, and is linked to the rotation of the cam. In a hydraulic lash adjuster built into a valve stem abutting portion of a rocker arm that swings in a vertical direction, a cylinder type body in which a body is inserted into the lash adjuster mounting hole. The hydraulic pressure is characterized in that the lining member is inserted into the reservoir forming hole, and the joint between the lining member inserted into the reservoir forming hole and the lining member inserted into the lash adjuster mounting hole is liquid-tightly sealed. Expression lash adjuster.
つラッシュアジャスタ取付孔に円筒型のボディが挿着さ
れるとともに、前記ボディにはバルブステム上端部に当
接する摺動プランジャが挿着され、前記リザーバ形成孔
には側面にオイル供給孔が設けられたキャップ型の内張
部材が挿着されて、内張部材とボディ上端部により、ロ
ッカアーム内のオイル供給路を介して供給されたオイル
を貯溜するリザーバが画成され、ボディとプランジャに
より、前記リザーバに小孔を介して連通し、この小孔を
閉塞動作するチェックボールを収容した高圧室が画成さ
れ、カムの回転に連係して揺動するロッカアームのバル
ブステム当接部に内蔵された油圧式ラッシュアジャスタ
において、前記内張部材には、ラッシュアジャスタ取付
孔に挿着されてボディ収容室を画成する円筒型のラッシ
ュアジャスタ取付孔挿着領域が一体形成されたことを特
徴とする油圧式ラッシュアジャスタ。2. A cylindrical body is inserted into a lash adjuster attachment hole having a reservoir forming hole connected in series, and a slide plunger abutting against the upper end of the valve stem is inserted into the body. A cap-type lining member having an oil supply hole on the side surface is inserted into the reservoir forming hole, and the oil supplied by the lining member and the upper end of the body is supplied through the oil supply passage in the rocker arm. A reservoir for storing the pressure is defined, and a body and a plunger communicate with the reservoir through a small hole, and a high-pressure chamber containing a check ball that closes the small hole is defined, and is linked to the rotation of the cam. In a hydraulic lash adjuster built in a valve stem abutting portion of a rocker arm that swings, the lining adjuster is inserted into a lash adjuster mounting hole and attached to the body. A cylindrical lash adjuster mounting hole insertion region that defines a housing chamber is integrally formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34772992A JP3305785B2 (en) | 1992-12-28 | 1992-12-28 | Hydraulic lash adjuster |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34772992A JP3305785B2 (en) | 1992-12-28 | 1992-12-28 | Hydraulic lash adjuster |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06193411A true JPH06193411A (en) | 1994-07-12 |
| JP3305785B2 JP3305785B2 (en) | 2002-07-24 |
Family
ID=18392198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34772992A Expired - Lifetime JP3305785B2 (en) | 1992-12-28 | 1992-12-28 | Hydraulic lash adjuster |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3305785B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030015482A (en) * | 2001-08-16 | 2003-02-25 | 현대자동차주식회사 | Hla |
| EP2250349A2 (en) * | 2008-02-08 | 2010-11-17 | Electro-Motive Diesel, Inc. | Lash adjuster |
| WO2013118634A1 (en) | 2012-02-10 | 2013-08-15 | アイシン精機株式会社 | Lash adjuster |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006126471A1 (en) * | 2005-05-23 | 2006-11-30 | Ntn Corporation | Lash adjuster in valve gear and arm type valve gear |
-
1992
- 1992-12-28 JP JP34772992A patent/JP3305785B2/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030015482A (en) * | 2001-08-16 | 2003-02-25 | 현대자동차주식회사 | Hla |
| EP2250349A2 (en) * | 2008-02-08 | 2010-11-17 | Electro-Motive Diesel, Inc. | Lash adjuster |
| EP2250349A4 (en) * | 2008-02-08 | 2011-05-25 | Electro Motive Diesel Inc | Lash adjuster |
| US8413626B2 (en) | 2008-02-08 | 2013-04-09 | Electro-Motive Diesel, Inc. | Lash adjuster |
| WO2013118634A1 (en) | 2012-02-10 | 2013-08-15 | アイシン精機株式会社 | Lash adjuster |
| US9157338B2 (en) | 2012-02-10 | 2015-10-13 | Aisin Seiki Kabushiki Kaisha | Lash adjuster |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3305785B2 (en) | 2002-07-24 |
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