JP2002332809A - Valve system in internal combustion engine - Google Patents
Valve system in internal combustion engineInfo
- Publication number
- JP2002332809A JP2002332809A JP2001135961A JP2001135961A JP2002332809A JP 2002332809 A JP2002332809 A JP 2002332809A JP 2001135961 A JP2001135961 A JP 2001135961A JP 2001135961 A JP2001135961 A JP 2001135961A JP 2002332809 A JP2002332809 A JP 2002332809A
- Authority
- JP
- Japan
- Prior art keywords
- tappet
- guide
- roller
- valve
- internal combustion
- 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.)
- Pending
Links
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
- F01L1/14—Tappets; Push rods
- F01L1/143—Tappets; Push rods for use with overhead camshafts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2305/00—Valve arrangements comprising rollers
-
- 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
- F01L2307/00—Preventing the rotation of tappets
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、内燃機関における
直動型の動弁機構に係り、特に、ローラタペットを備え
る動弁機構に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a direct-acting valve train in an internal combustion engine, and more particularly to a valve train having a roller tappet.
【０００２】[0002]
【従来の技術】内燃機関における直動型の動弁機構に
は、通常、図５に示すようなタペット(１)が用いられて
いる。このタペット(１)は、筒部(1a)と頂壁(1b)とから
なる有頂円筒形に形成され、筒部(1a)をシリンダヘッド
(２)のガイド孔(2a)に上下に摺動自在に嵌合して用いら
れる。2. Description of the Related Art A tappet (1) as shown in FIG. 5 is usually used for a direct-acting valve train in an internal combustion engine. The tappet (1) is formed in a cylindrical shape having a top with a cylinder (1a) and a top wall (1b).
It is used by being slidably fitted up and down in the guide hole (2a) of (2).
【０００３】タペット(１)の頂壁(1b)の下面中央には、
シリンダヘッド(２)に図示しないバルブスプリングやス
プリングリテーナ等により組付けられたエンジンバルブ
(３)の上端が当接し、頂壁(1b)の上面をカム(４)の回転
により押圧することにより、エンジンバルブ(３)を上下
に駆動するようになっている。In the center of the lower surface of the top wall (1b) of the tappet (1),
Engine valve assembled to the cylinder head (2) by a valve spring or spring retainer (not shown)
The engine valve (3) is driven up and down by contacting the upper end of (3) and pressing the upper surface of the top wall (1b) by rotation of the cam (4).
【０００４】[0004]
【発明が解決しようとする課題】上述したような有頂円
筒形のタペット(１)では、頂壁(1b)の上面とカム(４)と
の摺動摩擦抵抗が大きいため、フリクションロスによる
出力や燃費等に及ぼす影響も大きい。In the tappet (1) having a cylindrical shape having a top as described above, since the sliding friction resistance between the upper surface of the top wall (1b) and the cam (4) is large, the output due to friction loss and The effect on fuel economy etc. is also large.
【０００５】この問題に対処するために、頂壁(1b)の上
面を球面としたり、鏡面仕上げとしたり、低摩擦材をコ
ーティングするなどして、摩擦抵抗を低減することも行
われているが、いずれも摺動運動には変わりがないた
め、加工コストが増大する割には、フリクションロスの
低減効果は小さい。To cope with this problem, the frictional resistance is reduced by making the top surface of the top wall (1b) spherical, mirror-finished, or coated with a low-friction material. However, since the sliding motion remains unchanged, the effect of reducing the friction loss is small even though the processing cost is increased.
【０００６】本発明は、上記問題点に鑑みてなされたも
ので、比較的簡単な構造でカムとタペットとの摩擦抵抗
を大幅に低減しうるようにし、出力や燃費等を向上させ
うるようにした、内燃機関における動弁機構を提供する
ことを目的としている。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has a relatively simple structure so that the frictional resistance between a cam and a tappet can be greatly reduced, and output and fuel efficiency can be improved. It is another object of the present invention to provide a valve train in an internal combustion engine.
【０００７】[0007]
【課題を解決するための手段】本発明によると、上記課
題は、次のようにして解決される。 (１) シリンダヘッドに、上端部が該シリンダヘッドに
形成されたガイド孔内に位置するようにして組付けられ
たエンジンバルブと、その上方に設けられたカムとの間
に、タペットを介設し、このタペットを、前記カムの回
転により押圧することにより、前記エンジンバルブを上
下に駆動するようにした内燃機関における動弁機構にお
いて、前記タペットを、下面中央が前記エンジンバルブ
の上端と当接しうる基片の左右両端に下向きの１対のガ
イド片を備えるとともに、前記基片の前後の端縁に１対
の上向きの支持片を備えるタペット本体と、前記両支持
片間に上端が前記カムと接触しうるように挟入され、か
つ両支持片により支持された、前記カムの軸線と平行を
なす支軸回りに回転するローラとからなるローラタペッ
トとして、前記両ガイド片を、前記ガイド孔内に軸線回
りの回動を阻止して上下に摺動可能に嵌合する。According to the present invention, the above-mentioned problem is solved as follows. (1) A tappet is interposed between an engine valve mounted on a cylinder head such that an upper end is located in a guide hole formed in the cylinder head and a cam provided above the engine valve. The tappet is pressed by the rotation of the cam to drive the engine valve up and down. In the valve train mechanism of the internal combustion engine, the center of the lower surface of the tappet contacts the upper end of the engine valve. A tappet body including a pair of downwardly directed guide pieces at both left and right ends of the base piece, and a pair of upwardly directed support pieces at front and rear edges of the base piece; A roller rotating around a support axis parallel to the axis of the cam, the roller tappet being sandwiched so as to be able to contact with and supported by both support pieces. The de pieces slidably fitted vertically to prevent axial rotation around the guide hole.
【０００８】(２) 上記(１)項において、両ガイド片の
外面を、円弧状の凸面とするとともに、ガイド孔の内周
面に、前記凸面と補形をなす凹条ガイドを設け、前記ガ
イド片の凸面を凹条ガイドに摺動可能に嵌合することに
より、ローラタペットの軸線回りの回動を阻止するよう
にする。(2) In the above item (1), the outer surfaces of both the guide pieces are arc-shaped convex surfaces, and the inner peripheral surface of the guide hole is provided with a concave guide that is complementary to the convex surface. The rotation of the roller tappet around the axis is prevented by slidably fitting the convex surface of the guide piece to the concave guide.
【０００９】(３) 上記(１)項において、両ガイド片の
外面を、円弧状の凹面とするとともに、シリンダヘッド
におけるガイド孔の周縁部に、前記凹面が嵌合可能な硬
質のガイドロッドを、その外周面の一部がガイド孔内に
突出するように圧入し、前記ガイド片の凹面をガイドロ
ッドに摺動可能に嵌合することにより、ローラタペット
の軸線回りの回動を阻止するようにする。(3) In the above item (1), the outer surfaces of both the guide pieces are arc-shaped concave surfaces, and a hard guide rod to which the concave surfaces can be fitted is fitted around the guide hole of the cylinder head. The roller tappet is prevented from rotating around its axis by press-fitting so that a part of its outer peripheral surface projects into the guide hole and slidably fitting the concave surface of the guide piece to the guide rod. To
【００１０】(４) 上記(１)〜(３)項のいずれかにおい
て、タペット本体の基片における前後の支持片間の中央
部に凹部を形成し、この凹部内に少なくともローラの軸
受部の下端部が位置するように、ローラを支軸により支
承する。(4) In any one of the above items (1) to (3), a concave portion is formed in a center portion between the front and rear support pieces of the base piece of the tappet body, and at least the bearing portion of the roller is formed in the concave portion. The roller is supported by the support shaft so that the lower end is located.
【００１１】(５) 上記(１)〜(４)項のいずれかにおい
て、タペット本体を板金により形成する。(5) In any one of the above items (1) to (4), the tappet body is formed of a sheet metal.
【００１２】(６) 上記(１)〜(５)項のいずれかにおい
て、基片とガイド片との連設角部に、内方に突出する補
強リブを設ける。(6) In any one of the above items (1) to (5), a reinforcing rib protruding inward is provided at a continuous corner of the base piece and the guide piece.
【００１３】[0013]
【発明の実施の形態】以下、本発明の実施形態を、図面
に基づいて説明する。図１は、本発明の第１の実施形態
を示す斜視図、図２は、同じくエンジンに組付けた状態
の中央縦断正面図を示すもので、本発明の動弁機構に用
いられるローラタペット(５)は、正面視概ね門形をなす
タペット本体(６)とローラ(７)とよりなっている。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a first embodiment of the present invention, and FIG. 2 is a front view of a center longitudinal section in a state where the roller tappet is used in a valve mechanism of the present invention. 5) is composed of a tappet body (6) and a roller (7), each of which has a generally gate shape in a front view.
【００１４】上記タペット本体(６)は、中央部に浅い凹
部(6a)が形成され、かつその底部中央に水平のバルブ受
部(８)を備える、左右両端部が水平をなす基片(９)と、
その両端より下向きに垂下するとともに、外面が円弧状
の凸面となるように外向きに円弧状に折曲された左右１
対のガイド片(10)(10)と、基片(９)の前後の端縁の中央
部に、凹部(6a)の前後の開口面を閉塞するようにして上
向きに連設された１対のローラ支持片(11)(11)とからな
り、全体が剛板等の板金加工により一体成形されてい
る。The tappet body (6) has a shallow recess (6a) formed in the center and a horizontal valve receiving portion (8) in the center of the bottom. )When,
Left and right 1 that hang downward from both ends and are outwardly bent in an arc shape so that the outer surface becomes an arc-shaped convex surface.
A pair of guide pieces (10), (10) and a pair of upper pieces connected to the center of the front and rear edges of the base piece (9) so as to close the front and rear opening surfaces of the concave portion (6a). And the roller support pieces (11) and (11) are integrally formed by sheet metal working of a rigid plate or the like.
【００１５】ガイド片(10)の外周面には、例えば浸炭や
クロムメッキ等の耐摩耗表面処理が施されている。The outer peripheral surface of the guide piece (10) is subjected to a wear-resistant surface treatment such as carburization or chrome plating.
【００１６】基片(９)とガイド片(10)との連設角部の中
央部には、その部分を内方に向かって凹ませることによ
り、内向きに三角形状に膨出する補強リブ(12)が形成さ
れている。At the center of the continuous corner of the base piece (9) and the guide piece (10), a reinforcing rib bulging inward in a triangular shape by indenting that part inward. (12) is formed.
【００１７】上記ローラ(７)は、硬質のローラ本体(7a)
の中心部に針状ころ軸受(13)を嵌着して構成され、針状
ころ軸受(13)のインナーレースを、両ローラ支持片(11)
に圧入される支軸(14)に圧嵌することにより、両ローラ
支持片(11)間において、ローラ本体(7a)の下端部が凹部
(6a)内に位置するように、支軸(14)により回転自在に支
持されている。The roller (7) is a hard roller body (7a)
The inner race of the needle roller bearing (13) is fitted to the center of the needle roller bearing (13).
The lower end of the roller body (7a) is recessed between the roller support pieces (11) by press-fitting the support shaft (14) that is
It is rotatably supported by the support shaft (14) so as to be located in (6a).
【００１８】このような構造のローラタペット(５)を、
シリンダヘッド(２)に組み込むには、シリンダヘッド
(２)に設けられた、エンジンバルブ(３)の上端部が位置
するガイド孔(2a)を使用して行う。The roller tappet (5) having such a structure is
To incorporate into the cylinder head (2), use the cylinder head
This is performed by using a guide hole (2a) provided in (2) where the upper end of the engine valve (3) is located.
【００１９】すなわち、ガイド孔(2a)の内周面の１８０
°対向する位置に、上記ガイド片(10)の外周面と補形を
なす左右１対の凹条ガイド(15)(15)を、上下方向に沿っ
て形成し、両凹条ガイド(15)に、上記タペット本体(６)
の両ガイド片(10)を摺動可能に上方より嵌合する。That is, 180 of the inner peripheral surface of the guide hole (2a).
° A pair of left and right concave strip guides (15) (15), which are complementary to the outer peripheral surface of the guide piece (10), are formed along the vertical direction at opposite positions. And the above tappet body (6)
The two guide pieces (10) are slidably fitted from above.
【００２０】これにより、ローラタペット(５)は、軸線
回りに回動するのが阻止される。嵌合時において、タペ
ット本体(６)の中央のガイド部(８)の下面には、ガイド
孔(2a)内において、シリンダヘッド(２)にバルブスプリ
ング(16)及びスプリングリテーナ(17)等により組付けら
れたエンジンバルブ(３)の上端が当接する。This prevents the roller tappet (5) from rotating around the axis. At the time of fitting, on the lower surface of the guide portion (8) at the center of the tappet body (6), a valve spring (16) and a spring retainer (17) are attached to the cylinder head (2) in the guide hole (2a). The upper end of the assembled engine valve (3) comes into contact.
【００２１】また、この状態において、ローラ(７)の上
端に、その支軸(14)と平行をなすカムシャフト(18)のカ
ム(４)の外周面を当接させる。In this state, the outer peripheral surface of the cam (4) of the cam shaft (18), which is parallel to the support shaft (14), is brought into contact with the upper end of the roller (7).
【００２２】第１の実施形態のローラタペット(５)にお
いて、カム(４)の回転によりローラ(７)が強く押圧され
ると、タペット本体(６)が凹条ガイド(15)に案内されて
上下に摺動運動することにより、エンジンバルブ(３)は
開閉させられる。In the roller tappet (5) of the first embodiment, when the roller (7) is strongly pressed by the rotation of the cam (4), the tappet body (6) is guided by the groove guide (15). By sliding up and down, the engine valve (3) is opened and closed.
【００２３】この際、ローラ(７)は、カム(４)により回
転させられながら上下動し、カム(４)との間に相対滑り
が発生しないため、摩擦抵抗が著しく低減される。At this time, the roller (7) moves up and down while being rotated by the cam (4), and relative slip does not occur between the roller (7) and the cam (4), so that the frictional resistance is significantly reduced.
【００２４】その結果、フリクションロスが小さくなっ
て、出力や燃費等が向上する。As a result, the friction loss is reduced, and the output and the fuel consumption are improved.
【００２５】また、凹部(6a)に満たされた潤滑油にロー
ラ本体(7a)の下端部が浸漬されるので、カム(４)とロー
ラ本体(7a)との接触面が潤滑され、それらの摩耗を最小
限に抑えることができる。さらに、タペット本体(６)
は、板金により門形に形成されているので、軽量化が可
能となる。Since the lower end of the roller body (7a) is immersed in the lubricating oil filled in the recess (6a), the contact surface between the cam (4) and the roller body (7a) is lubricated. Wear can be minimized. Furthermore, tappet body (6)
Is formed in a gate shape by sheet metal, so that the weight can be reduced.
【００２６】図３は、本発明の第２の実施形態を示すも
ので、この実施形態に用いられるローラタペット(19)
は、タペット本体(６)の中央部に、ローラ(７)の下半部
が遊嵌しうる大きさの上方が拡開する凹部(20)を形成す
るとともに、その中央部の水平をなす底片をバルブ受部
(８)として、下面にエンジンバルブ(３)の上端が当接す
るようにしてある。FIG. 3 shows a second embodiment of the present invention. A roller tappet (19) used in this embodiment is shown in FIG.
Is formed at the center of the tappet body (6) with a concave portion (20) whose upper part is widened so that the lower half of the roller (7) can be loosely fitted, and a horizontal bottom piece at the center thereof. The valve receiver
As (8), the upper surface of the engine valve (3) is in contact with the lower surface.
【００２７】上記凹部(20)の前後の開口面は、タペット
本体(６)に上向きに連設された、上記実施形態よりも若
干短寸の１対のローラ支持片(11)により閉塞され、凹部
(20)内が潤滑油で満たされるようにしてある。The front and rear opening surfaces of the concave portion (20) are closed by a pair of roller support pieces (11), which are slightly connected to the tappet body (6) upward and are slightly shorter than the above embodiment, Recess
The interior of (20) is filled with lubricating oil.
【００２８】上記と同様のローラ(７)は、両ローラ支持
片(11)に、中心をタペット本体(６)の上面よりも若干下
位となるように圧入した支軸(14)により支持されてい
る。A roller (7) similar to the above is supported by a support shaft (14) press-fitted into both roller support pieces (11) so that the center is slightly lower than the upper surface of the tappet body (6). I have.
【００２９】タペット本体(６)の両端の左右１対のガイ
ド片(10)及び補強リブ(12)の形状は、上記実施形態と同
形としてある。The shapes of a pair of left and right guide pieces (10) and reinforcing ribs (12) at both ends of the tappet body (6) are the same as those in the above embodiment.
【００３０】このような構造のローラタペット(19)を使
用すると、上記実施形態のローラタペット(５)の作用効
果に加えて、凹部(20)内に満たされた潤滑油に、針状こ
ろ軸受(13)の下端部も浸漬されるので、針状ころ及びそ
れとの接触面が効果的に潤滑されるようになり、摩耗が
抑えられて軸受(13)の耐久性が向上する。When the roller tappet (19) having such a structure is used, in addition to the operation and effect of the roller tappet (5) of the above-described embodiment, the lubricating oil filled in the recess (20) is used for the needle roller bearing. Since the lower end of (13) is also immersed, the needle rollers and the contact surface therewith are effectively lubricated, wear is suppressed, and the durability of the bearing (13) is improved.
【００３１】図４は、本発明の第３の実施形態を示す。
この実施形態に用いられるローラタペット(21)は、タペ
ット本体(６)に連設されたガイド片(10)を、上記実施形
態とは反対に、外面が円弧状の凹面となるように、内向
きに円弧状に折曲させてある。それ以外の構造は、上記
第１の実施形態のローラタペット(５)と同一としてあ
る。FIG. 4 shows a third embodiment of the present invention.
In the roller tappet (21) used in this embodiment, the guide piece (10) provided continuously to the tappet body (6) is formed such that the outer surface is an arc-shaped concave surface, as opposed to the above embodiment. It is bent in the direction of an arc. The other structure is the same as the roller tappet (5) of the first embodiment.
【００３２】一方、このローラタペット(21)が嵌合され
るシリンダヘッド(２)におけるガイド孔(2a)の１８０°
対向する位置に穿設された欠円形の嵌合孔(22)には、ガ
イド片(10)の外面が上下に摺動可能として嵌合される硬
質金属製の１対のガイドロッド(23)(23)が、その外周面
の一部をガイド孔(2a)内に突出させて圧入されている。On the other hand, 180 ° of the guide hole (2a) in the cylinder head (2) into which the roller tappet (21) is fitted.
A pair of hard metal guide rods (23) into which the outer surfaces of the guide pieces (10) are slidable up and down are fitted into the missing circular fitting holes (22) drilled at opposing positions. (23) is press-fitted with a part of the outer peripheral surface protruding into the guide hole (2a).
【００３３】ガイドロッド(23)の外周面には、浸炭やク
ロムメッキ等の耐摩耗処理が施されている。The outer peripheral surface of the guide rod (23) is subjected to a wear-resistant treatment such as carburization or chrome plating.
【００３４】第３の実施形態においても、上記と同様の
作用効果を奏しうるとともに、シリンダヘッド(２)がア
ルミニウム合金製とされた際の、シリンダヘッド(２)側
の摺動部の摩耗を、ガイドロッド(23)により効果的に抑
えることができる。In the third embodiment, the same operation and effect as described above can be obtained, and the wear of the sliding portion on the cylinder head (2) side when the cylinder head (2) is made of an aluminum alloy is reduced. , Can be effectively suppressed by the guide rod (23).
【００３５】なお、この実施形態においても、タペット
本体(６)の中央部を、図３に示すような形状としてもよ
いことは勿論である。Incidentally, also in this embodiment, it is a matter of course that the center portion of the tappet body (6) may be shaped as shown in FIG.
【００３６】上記実施形態では、ローラ(７)の軸受に、
針状ころ軸受(13)を用いているが、動弁機構全体の上下
寸法を小さくするために、通常の平軸受を用いることも
ある。In the above embodiment, the roller (7) has a bearing
Although a needle roller bearing (13) is used, an ordinary flat bearing may be used in order to reduce the vertical dimension of the entire valve train.
【００３７】[0037]
【発明の効果】請求項１記載の発明によれば、従来の有
頂円筒形のタペットを用いた動弁機構に比して、カムと
の摩擦抵抗は著しく低減するため、フリクションロスが
小さくなり、エンジンの出力や燃費を向上させることが
できる。According to the first aspect of the present invention, the frictional resistance with the cam is significantly reduced as compared with the conventional valve train using a topped cylindrical tappet, so that the friction loss is reduced. In addition, the engine output and fuel efficiency can be improved.
【００３８】請求項２記載の発明によれば、ローラタペ
ットの軸線回りの回動を、簡単な手段で確実に阻止しう
る。According to the second aspect of the present invention, the rotation of the roller tappet around the axis can be reliably prevented by simple means.
【００３９】請求項３記載の発明によれば、上記請求項
２の効果に加えて、シリンダヘッドをアルミニウム合金
製とした際のシリンダヘッドの摺動部の摩耗を、ガイド
ロッドにより効果的に抑えることができる。According to the third aspect of the invention, in addition to the effect of the second aspect, wear of the sliding portion of the cylinder head when the cylinder head is made of an aluminum alloy is effectively suppressed by the guide rod. be able to.
【００４０】請求項４記載の発明によれば、ローラ及び
軸受部の下端部が、凹部内に貯まった潤滑油に浸漬され
るので、ローラとカムとの接触面や軸受部が効果的に潤
滑され、それらの摩耗を抑えることができる。According to the fourth aspect of the present invention, since the lower ends of the roller and the bearing are immersed in the lubricating oil stored in the recess, the contact surface between the roller and the cam and the bearing are effectively lubricated. And their wear can be suppressed.
【００４１】請求項５記載の発明によれば、ローラタペ
ットの軽量化が図れる。According to the fifth aspect of the invention, the weight of the roller tappet can be reduced.
【００４２】請求項６記載の発明によれば、基片とガイ
ド片との連設部の曲げ強度が大となるので、タペット本
体を薄肉の板金により形成したとしても、十分な強度が
確保される。According to the sixth aspect of the present invention, since the bending strength of the continuous portion between the base piece and the guide piece is large, sufficient strength is secured even if the tappet body is formed of a thin sheet metal. You.
【図１】本発明の第１の実施形態を示す要部の分解斜視
図である。FIG. 1 is an exploded perspective view of a main part showing a first embodiment of the present invention.
【図２】同じく、エンジンに組付けた状態の要部の中央
縦断正面図である。FIG. 2 is a vertical front view of a central portion of a main part in a state where the engine is assembled to an engine.
【図３】同じく、第２の実施形態におけるローラタペッ
トの中央縦断正面図である。FIG. 3 is a central longitudinal sectional front view of a roller tappet according to a second embodiment.
【図４】同じく、第３の実施形態を示す要部の分解斜視
図である。FIG. 4 is an exploded perspective view of a main part showing the third embodiment.
【図５】従来の動弁機構を示す要部の中央縦断正面図で
ある。FIG. 5 is a front view of a main portion of a conventional valve train, taken along a central longitudinal section.
(１)シリンダヘッド (2a)ガイド孔 (３)エンジンバルブ (４)カム (５)(19)(21)ローラタペット (６)タペット本体 (6a)(20)凹部 (７)ローラ (7a)ローラ本体 (８)バルブ受部 (９)基片 (10)ガイド片 (11)ローラ支持片 (12)補強リブ (13)針状ころ軸受 (14)支軸 (15)凹条ガイド (16)バルブスプリング (17)スプリングリテーナ (18)カムシャフト (22)嵌合孔 (23)ガイドロッド (1) Cylinder head (2a) Guide hole (3) Engine valve (4) Cam (5) (19) (21) Roller tappet (6) Tappet body (6a) (20) recess (7) Roller (7a) Roller Body (8) Valve receiving part (9) Base piece (10) Guide piece (11) Roller support piece (12) Reinforcement rib (13) Needle roller bearing (14) Support shaft (15) Concave guide (16) Valve Spring (17) Spring retainer (18) Camshaft (22) Fitting hole (23) Guide rod
フロントページの続き Ｆターム(参考） 3G016 AA06 AA19 BA19 BB03 BB04 CA03 CA04 CA06 CA07 CA16 CA21 CA22 CA34 CA35 CA43 CA52 EA02 FA07 FA29 GA01 GA02 3G024 AA05 AA13 AA17 DA08 FA06Continued on the front page F term (reference) 3G016 AA06 AA19 BA19 BB03 BB04 CA03 CA04 CA06 CA07 CA16 CA21 CA22 CA34 CA35 CA43 CA52 EA02 FA07 FA29 GA01 GA02 3G024 AA05 AA13 AA17 DA08 FA06
Claims (6)
ヘッドに形成されたガイド孔内に位置するようにして組
付けられたエンジンバルブと、その上方に設けられたカ
ムとの間に、タペットを介設し、このタペットを、前記
カムの回転により押圧することにより、前記エンジンバ
ルブを上下に駆動するようにした内燃機関における動弁
機構において、 前記タペットを、下面中央が前記エンジンバルブの上端
と当接しうる基片の左右両端に下向きの１対のガイド片
を備えるとともに、前記基片の前後の端縁に１対の上向
きの支持片を備えるタペット本体と、前記両支持片間に
上端が前記カムと接触しうるように挟入され、かつ両支
持片により支持された、前記カムの軸線と平行をなす支
軸回りに回転するローラとからなるローラタペットとし
て、前記両ガイド片を、前記ガイド孔内に軸線回りの回
動を阻止して上下に摺動可能に嵌合したことを特徴とす
る内燃機関における動弁機構。1. A tappet is provided between an engine valve mounted on a cylinder head such that an upper end is located in a guide hole formed in the cylinder head and a cam provided above the engine valve. In the valve mechanism in an internal combustion engine in which the tappet is pressed by the rotation of the cam to drive the engine valve up and down, the center of the lower surface of the tappet is located at the upper end of the engine valve. A tappet body having a pair of downwardly directed guide pieces at both left and right ends of a base piece that can be in contact with the tappet body and a pair of upwardly directed support pieces at front and rear edges of the base piece, and an upper end between the two support pieces. As a roller tappet comprising a roller which is sandwiched so as to be able to come into contact with the cam, and is supported by both support pieces, and which rotates about a support shaft parallel to the axis of the cam. Wherein both guide piece, the guide hole valve mechanism in an internal combustion engine, characterized in that slidably fitted vertically to prevent axial rotation around inside.
るとともに、ガイド孔の内周面に、前記凸面と補形をな
す凹条ガイドを設け、前記ガイド片の凸面を凹条ガイド
に摺動可能に嵌合することにより、ローラタペットの軸
線回りの回動を阻止するようにした請求項１記載の内燃
機関における動弁機構。2. An outer surface of each of the guide pieces is an arc-shaped convex surface, and a concave guide which is complementary to the convex surface is provided on an inner peripheral surface of the guide hole, and the convex surface of the guide piece is a concave guide. 2. The valve mechanism in an internal combustion engine according to claim 1, wherein the roller tappet is prevented from rotating around an axis by slidably fitting to the roller tappet.
るとともに、シリンダヘッドにおけるガイド孔の周縁部
に、前記凹面が嵌合可能な硬質のガイドロッドを、その
外周面の一部がガイド孔内に突出するように圧入し、前
記ガイド片の凹面をガイドロッドに摺動可能に嵌合する
ことにより、ローラタペットの軸線回りの回動を阻止す
るようにした請求項１記載の内燃機関における動弁機
構。3. An outer surface of each of the guide pieces is an arc-shaped concave surface, and a hard guide rod to which the concave surface can be fitted is provided on a peripheral portion of the guide hole in the cylinder head, and a part of the outer peripheral surface thereof is provided. 2. The internal combustion engine according to claim 1, wherein the roller tappet is prevented from rotating around an axis by press-fitting the protrusion into the guide hole and slidably fitting the concave surface of the guide piece to the guide rod. Valve train in the engine.
片間の中央部に凹部を形成し、この凹部内に少なくとも
ローラの軸受部の下端部が位置するように、ローラを支
軸により支承した請求項１〜３のいずれかに記載の内燃
機関における動弁機構。4. A concave portion is formed in the center of the base piece of the tappet body between the front and rear support pieces, and the roller is supported by a support shaft such that at least the lower end of the bearing portion of the roller is located in the concave portion. A valve train in the internal combustion engine according to claim 1.
項１〜４のいずれかに記載の内燃機関における動弁機
構。5. The valve operating mechanism in an internal combustion engine according to claim 1, wherein the tappet body is formed of a sheet metal.
突出する補強リブを設けた請求項１〜５のいずれかに記
載の内燃機関における動弁機構。6. The valve operating mechanism for an internal combustion engine according to claim 1, wherein a reinforcing rib protruding inward is provided at a continuous corner portion between the base piece and the guide piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001135961A JP2002332809A (en) | 2001-05-07 | 2001-05-07 | Valve system in internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001135961A JP2002332809A (en) | 2001-05-07 | 2001-05-07 | Valve system in internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002332809A true JP2002332809A (en) | 2002-11-22 |
Family
ID=18983334
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001135961A Pending JP2002332809A (en) | 2001-05-07 | 2001-05-07 | Valve system in internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002332809A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010001884A (en) * | 2008-05-19 | 2010-01-07 | Otics Corp | Sliding lifter and its manufacturing method |
| JP2010059892A (en) * | 2008-09-04 | 2010-03-18 | Toyota Motor Corp | Roller lifter and its manufacturing method, and liquid pump |
| FR2948966A1 (en) * | 2009-08-07 | 2011-02-11 | Racing Dev Moteur R D M | U shaped valve lifter for use in cylindrical hole of cylinder head of internal combustion engine, has branches comprising convex cylindrical external surfaces with concentric transverse profiles in form of arc of circle |
| WO2012004037A1 (en) * | 2010-07-07 | 2012-01-12 | Schaeffler Technologies Gmbh & Co. Kg | Tappet |
| EP2711546A1 (en) * | 2012-09-24 | 2014-03-26 | Continental Automotive GmbH | Tappet arrangement and pump |
| EP2853699A1 (en) * | 2013-09-27 | 2015-04-01 | Aktiebolaget SKF | Tappet, injection pump and valve actuator comprising such a tappet and manufacturing method for such a tappet |
| US9695924B2 (en) | 2013-09-27 | 2017-07-04 | Aktiebolaget Skf | Mechanical system, injection pump and valve actuator comprising such a mechanical system and manufacturing method |
-
2001
- 2001-05-07 JP JP2001135961A patent/JP2002332809A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010001884A (en) * | 2008-05-19 | 2010-01-07 | Otics Corp | Sliding lifter and its manufacturing method |
| JP2010059892A (en) * | 2008-09-04 | 2010-03-18 | Toyota Motor Corp | Roller lifter and its manufacturing method, and liquid pump |
| CN102089500A (en) * | 2008-09-04 | 2011-06-08 | 丰田自动车株式会社 | Roller lifter, roller lifter production method and liquid pump |
| US8863615B2 (en) | 2008-09-04 | 2014-10-21 | Toyota Jidosha Kabushiki Kaisha | Roller lifter, roller lifter production method and liquid pump |
| FR2948966A1 (en) * | 2009-08-07 | 2011-02-11 | Racing Dev Moteur R D M | U shaped valve lifter for use in cylindrical hole of cylinder head of internal combustion engine, has branches comprising convex cylindrical external surfaces with concentric transverse profiles in form of arc of circle |
| WO2012004037A1 (en) * | 2010-07-07 | 2012-01-12 | Schaeffler Technologies Gmbh & Co. Kg | Tappet |
| CN103026011A (en) * | 2010-07-07 | 2013-04-03 | 谢夫勒科技股份两合公司 | Tappet |
| US8863716B2 (en) | 2010-07-07 | 2014-10-21 | Schaeffler Technologies Gmbh & Co. Kg | Tappet |
| EP2711546A1 (en) * | 2012-09-24 | 2014-03-26 | Continental Automotive GmbH | Tappet arrangement and pump |
| EP2853699A1 (en) * | 2013-09-27 | 2015-04-01 | Aktiebolaget SKF | Tappet, injection pump and valve actuator comprising such a tappet and manufacturing method for such a tappet |
| US9695924B2 (en) | 2013-09-27 | 2017-07-04 | Aktiebolaget Skf | Mechanical system, injection pump and valve actuator comprising such a mechanical system and manufacturing method |
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