JPH0610095Y2 - Tapest - Google Patents

Description

【考案の詳細な説明】 〔産業上の利用分野〕 この考案は内燃機関においてカムの運動を燃焼室の吸排
気弁へ伝達するのに用いられるタペットに関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a tappet used in an internal combustion engine to transmit the motion of a cam to intake and exhaust valves of a combustion chamber.

〔従来の技術〕[Conventional technology]

カムとの摺動部の耐摩耗性を改善するためにセラミック
製部材をタペット本体に接合し、セラミック製部材を摺
動部とすることが一般に行なわれている。その場合、従
来技術では(a)第２図に示されるように金属製タペット
本体１とセラミック製部材との接合面に接着剤３を介在
させたり（実開昭59-107004号）、(b)接合面の周囲に沿
ってろう付けしたり、(c)第３図(a)に示されるようにタ
ペット本体１の端面に円形凹所４形成し、この凹所４内
にセラミック製部材２を冷間嵌めにより固定したり、あ
るは(d)セラミック製部材をタペット本体に螺合させた
り（実開昭60-10808号）している。In order to improve the wear resistance of the sliding portion with the cam, a ceramic member is generally joined to the tappet body to make the ceramic member the sliding portion. In that case, in the prior art, as shown in FIG. 2 (a), an adhesive 3 may be interposed between the metal tappet body 1 and the ceramic member (Act No. 59-107004), (b). ) Brazing is performed along the periphery of the joint surface, or (c) a circular recess 4 is formed in the end face of the tappet body 1 as shown in FIG. 3 (a), and the ceramic member 2 is formed in this recess 4. Is fixed by cold fitting, or (d) a ceramic member is screwed onto the tappet body (Shokai Sho 60-10808).

〔考案が解決しようとする課題〕[Problems to be solved by the device]

(a)では、熱変形に因る歪の吸収性は良好であるが、接
着が弱いためにカムからの衝撃によりセラミック製部材
がタペット本体からはく離することがあり、(b)では歪
吸収性が低いとともに、固着面積が小さく、熱膨張差に
よりかかるろう付け部の大きな応力のためにセラミック
製部材がはく離することがあり、(c)では冷間嵌めに因
る曲げ応力５のためにセラミック製部材が第３図(b)に
示されるようにカム側へ湾曲し、カムからの押圧力によ
りセラミック製部材に亀裂が生じることがあり、(d)で
はセラミック製部材にねじ溝を形成するのが難しいとい
う問題がある。In (a), the absorption of strain due to thermal deformation is good, but due to the weak adhesion, the ceramic member may peel off from the tappet body due to the impact from the cam, and in (b) the strain absorption The ceramic member may peel off due to the large stress of the brazed portion due to the difference in thermal expansion, and the fixing area is small. As shown in FIG. 3 (b), the manufactured member is curved toward the cam, and the ceramic member may be cracked due to the pressing force from the cam. In (d), a thread groove is formed in the ceramic member. There is a problem that it is difficult.

この考案は、従来技術のこのような問題を解消し、固着
性及び歪吸収性の優れたセラミック製部材付きタペット
を提供することである。This invention solves such a problem of the prior art and provides a tappet with a ceramic member having excellent adhesion and strain absorption.

〔課題を解決するための手段〕[Means for Solving the Problems]

この考案ではセラミック製部材はカムとの摺動側の方へ
外径を漸減するテーパ形状を有し、環状部材がセラミッ
ク製部材のテーパ状外周に嵌合するテーパ状内周をも
つ。環状部材は円柱状内周に形成した雌ねじ部を金属製
タペット本体の接合側端部の外周に形成した雄ねじ部に
螺合するとともに、テーパ状内周によりセラミック製部
材を金属製タペット本体に押圧している。接着剤はセラ
ミック製部材と金属製タペット本体との間及びセラミッ
ク製部材と環状部材との間に介在されている。In this invention, the ceramic member has a taper shape in which the outer diameter gradually decreases toward the sliding side with the cam, and the annular member has a tapered inner circumference that fits into the tapered outer circumference of the ceramic member. The annular member has an internal thread formed on the inner circumference of the cylinder screwed into a male thread formed on the outer circumference of the joining side end of the metal tappet body, and the tapered inner circumference presses the ceramic member against the metal tappet body. is doing. The adhesive is interposed between the ceramic member and the metal tappet body and between the ceramic member and the annular member.

〔実施例〕〔Example〕

以下、図示の実施例についてこの考案を説明する。 The invention will be described below with reference to the illustrated embodiments.

第１図において金属製タペット本体11はきのこ形状を有
し、円形状大径部12の外周には雄ねじ部13が形成されて
いる。カムとの摺動部としてのセラミック製部材14は円
板状に形成され、その外周は摺動側の外へ外径を漸減す
るテーパ状になっている。金属製環状部材15は、雌ねじ
部16を形成されている円柱状内周と、セラミック製部材
14のテーパ状外周に嵌合するテーパ状内周17とをもち、
大径部12に螺合され、テーパ状内周17によりセラミック
製部材14を大径部12の方へ押圧する。接着剤18は大径部
12とセラミック製部材14との接合面及びセラミック製部
材14のテーパ状外周と環状部材15のテーパ状内周17との
間に全体にわたって介在させる。In FIG. 1, a metal tappet body 11 has a mushroom shape, and a male thread portion 13 is formed on the outer circumference of a circular large diameter portion 12. The ceramic member 14 as a sliding portion with respect to the cam is formed in a disk shape, and the outer circumference thereof is tapered so that the outer diameter is gradually reduced to the outside on the sliding side. The metal annular member 15 includes a cylindrical inner circumference having a female screw portion 16 and a ceramic member.
With a tapered inner circumference 17 that fits into the tapered outer circumference of 14,
The ceramic member 14 is screwed to the large-diameter portion 12 and pressed by the tapered inner circumference 17 toward the large-diameter portion 12. Adhesive 18 is large diameter part
The joint surface between 12 and the ceramic member 14 and the tapered outer circumference of the ceramic member 14 and the tapered inner circumference 17 of the annular member 15 are entirely interposed.

〔考案の効果〕[Effect of device]

このようにカムとの摺動部としてのセラミック製部材は
タペット本体及びこのタペット本体に螺合する環状部材
のテーパ状内周に接着剤により固着されるので、熱変形
に因る歪に対して良好な吸収性を保持することができ
る。As described above, the ceramic member as the sliding portion with the cam is fixed to the taper inner periphery of the tappet main body and the annular member screwed to the tappet main body by an adhesive, so that the distortion due to the thermal deformation is prevented. Good absorbency can be maintained.

また環状部材の雌ねじ部をタペット本体の大径部の雄ね
じ部に螺合することで、前記環状部材のテーパ状内周が
セラミック製部材のテーパ状外周に嵌合してセラミック
製部材をタペット本体に押圧しているので、セラミック
製部材をタペット本体に強固に固着させてタペット本体
からのセラミック製部材のはく離を回避することができ
る。Further, by screwing the female thread portion of the annular member into the male thread portion of the large diameter portion of the tappet body, the tapered inner circumference of the annular member is fitted to the tapered outer circumference of the ceramic member, and the ceramic member is attached to the tappet body. Since it is pressed against, it is possible to firmly adhere the ceramic member to the tappet body and prevent the ceramic member from peeling off from the tappet body.

【図面の簡単な説明】[Brief description of drawings]

第１図はこの考案の一実施例の縦断面図、第２図及び第
３図は従来のタペットの縦断面図である。 11……タペット本体、14……セラミック製部材、15……
環状部材、18……接着剤。FIG. 1 is a vertical sectional view of an embodiment of the present invention, and FIGS. 2 and 3 are vertical sectional views of a conventional tappet. 11 …… Tappet body, 14 …… Ceramic member, 15 ……
Ring member, 18 ... Adhesive.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項１】セラミック製部材が金属製タペット本体に
接合されてカムとの摺動部となっているタペットにおい
て、前記セラミック製部材は前記カムとの摺動側の方へ
外径を漸減するテーパ形状を有し、環状部材が前記セラ
ミック製部材のテーパ状外周に嵌合するテーパ状内周を
もち、前記環状部材の円柱状内周に形成した雌ねじ部を
前記金属製タペット本体の接合側端部の外周に形成した
雄ねじ部に螺合するとともに、前記テーパ状内周により
前記セラミック製部材を前記金属製タペット本体へ押圧
し、接着剤を前記セラミック製部材と前記金属製タペッ
ト本体との間及び前記セラミック製部材と前記環状部材
との間に介在させることを特徴とするタペット。1. A tappet in which a ceramic member is joined to a metal tappet body to form a sliding portion with a cam, wherein the ceramic member has an outer diameter gradually reduced toward a sliding side with the cam. An annular member having a taper shape, an annular member having a tapered inner circumference that fits into the tapered outer circumference of the ceramic member, and a female thread portion formed on the cylindrical inner circumference of the annular member is provided on the joining side of the metal tappet body. While being screwed into a male screw portion formed on the outer circumference of the end portion, the ceramic member is pressed against the metal tappet body by the tapered inner circumference, and an adhesive is applied between the ceramic member and the metal tappet body. A tappet, wherein the tappet is interposed between the ceramic member and the annular member.