JP2015117672A - Structure of oil level gauge inserting portion - Google Patents

Structure of oil level gauge inserting portion Download PDF

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JP2015117672A
JP2015117672A JP2013263182A JP2013263182A JP2015117672A JP 2015117672 A JP2015117672 A JP 2015117672A JP 2013263182 A JP2013263182 A JP 2013263182A JP 2013263182 A JP2013263182 A JP 2013263182A JP 2015117672 A JP2015117672 A JP 2015117672A
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cover
level gauge
insertion cylinder
oil level
cylinder
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JP6188565B2 (en
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大蔵 伊藤
Daizo Ito
大蔵 伊藤
智 新川
Satoshi Shinkawa
智 新川
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Mahle Filter Systems Japan Corp
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Mahle Filter Systems Japan Corp
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Abstract

PROBLEM TO BE SOLVED: To optimize a structure of an oil level gauge inserting portion formed on a cylinder head cover.SOLUTION: An oil level gauge inserting portion 7 is disposed on an upper cover 3, and has a cylindrical upper insertion cylinder 11 to which an oil level gauge is inserted, a projecting wall 12 projecting toward a top face side of a lower cover 2 from an upper cover 3 side around the upper insertion cylinder 11, and a cylindrical lower insertion cylinder 13 which is disposed on the lower cover 2 and to which the upper insertion cylinder 11 is inserted. An upper end of the lower insertion cylinder 13 and the upper cover 3 are joined between the upper insertion cylinder 11 and the projecting wall 12, a joining part of the upper end of the lower insertion cylinder 13 and the upper cover 3 is covered by the projecting wall 12 at their outer peripheral side, and their inner peripheral side is covered by the upper insertion cylinder 11.

Description

本発明は、ロアカバーとアッパカバーとからなるシリンダヘッドカバーに形成されたオイルレベルゲージ挿入部構造に関する。   The present invention relates to an oil level gauge insertion portion structure formed on a cylinder head cover including a lower cover and an upper cover.

例えば、特許文献１には、上下に２分割されたシリンダヘッドカバーのうち、上方側ヘッドカバーにオイルレベルゲージが挿入される筒状のオイルレベルゲージ保持部が形成され、下方側ヘッドカバーにオイルレベルゲージ保持部のレベルゲージ挿入孔と連続するゲージ孔が貫通形成された構成が開示されている。   For example, in Patent Document 1, a cylindrical oil level gauge holding portion into which an oil level gauge is inserted is formed in the upper head cover of the cylinder head cover divided into two vertically, and the oil level gauge is held in the lower head cover. A configuration in which a gauge hole continuous with the level gauge insertion hole of the part is formed through is disclosed.

特開２０１２−２２９６２５号公報JP2012-229625A

しかしながら、このような特許文献１においては、筒状のオイルレベルゲージ保持部の周囲に上方側ヘッドカバーと下方側ヘッドカバーとの接合点が設定されていない。そのため、オイルレベルゲージ保持部を所期位置で、かつ所期形状で保持しにくく、オイルレベルゲージ保持部の中心軸と、下方側ヘッドカバーに形成されたレベルゲージ挿入孔の中心軸やシリンダヘッドに形成されたレベルゲージ挿入孔の中心軸等とのずれによりオイルレベルゲージの挿入性が悪化してしまう虞がある。   However, in Patent Document 1, such a joint point between the upper head cover and the lower head cover is not set around the cylindrical oil level gauge holding portion. For this reason, it is difficult to hold the oil level gauge holding part at the expected position and in the desired shape, and the oil level gauge holding part is attached to the center axis of the oil level gauge holding part, the center axis of the level gauge insertion hole formed in the lower head cover, and the cylinder head There is a possibility that the insertion property of the oil level gauge is deteriorated due to a deviation from the center axis of the formed level gauge insertion hole.

つまり、特許文献１に開示されるようなシリンダヘッドカバーにおいては、オイルレベルゲージ保持部の周囲に、どのように上方側ヘッドカバーと下方側ヘッドカバーとの接合点を設定するかについて十分な検討がなされているとはいえず、オイルレベルゲージの挿入部を設けるにあたって改善の余地がある。   That is, in the cylinder head cover as disclosed in Patent Document 1, sufficient examination has been made on how to set the joint point between the upper head cover and the lower head cover around the oil level gauge holding portion. However, there is room for improvement in installing the oil level gauge insert.

本発明のオイルレベルゲージ挿入部構造は、シリンダヘッドに固定されるロアカバーと、該ロアカバーの上面に接合されるアッパカバーと、を備えたシリンダヘッドカバーに形成されるものであり、オイルレベルゲージ挿入部は、上記アッパカバーに設けられ、オイルレベルゲージが挿入される筒状のアッパ挿入筒と、該アッパ挿入筒の周囲のアッパカバー側から上記ロアカバーの上面側に向かって突出する突条壁と、上記ロアカバーに設けられ、上記アッパ挿入筒が挿入される筒状のロア挿入筒と、を有し、上記アッパ挿入筒と上記突条壁との間で上記ロア挿入筒の上端と上記アッパカバーとが接合され、上記ロア挿入筒の上端と上記アッパカバーとの接合部分は、その外周側が上記突条壁によって覆われ、その内周側が上記アッパ挿入筒によって覆われていることを特徴としている。   The oil level gauge insertion portion structure of the present invention is formed in a cylinder head cover including a lower cover fixed to the cylinder head and an upper cover joined to the upper surface of the lower cover. A cylindrical upper insertion cylinder provided in the upper cover, into which an oil level gauge is inserted, a ridge wall projecting from the upper cover side around the upper insertion cylinder toward the upper surface side of the lower cover, A cylindrical lower insertion cylinder provided in the lower cover and into which the upper insertion cylinder is inserted, and an upper end of the lower insertion cylinder and the upper cover between the upper insertion cylinder and the protruding wall. Are joined, and the outer peripheral side of the joined portion between the upper end of the lower insertion cylinder and the upper cover is covered with the protruding wall, and the inner circumference side is the upper insertion cylinder Therefore, it is characterized in that it is covered.

また、上記ロア挿入筒の上端は、全周に亙って連続するよう上記アッパカバーに接合されていてもよい。   The upper end of the lower insertion tube may be joined to the upper cover so as to be continuous over the entire circumference.

本発明によれば、ロア挿入筒の上端とアッパカバーとの接合部分を、アッパ挿入筒の壁面を利用して覆い隠すことができる。そのため、アッパ挿入筒を利用せずにロア挿入筒の上端とアッパカバーとの接合部分を覆い隠す場合に比べて、ロア挿入筒の上端とアッパカバーとの接合部分を覆い隠す構造をアッパ挿入筒の半径方向で小さくすることができる。   According to the present invention, the joint portion between the upper end of the lower insertion cylinder and the upper cover can be covered using the wall surface of the upper insertion cylinder. Therefore, the upper insertion cylinder has a structure that covers the joint between the upper end of the lower insertion cylinder and the upper cover, rather than using the upper insertion cylinder to cover the joint between the upper end of the lower insertion cylinder and the upper cover. Can be reduced in the radial direction.

本発明に係るオイルレベルゲージ挿入部構造が適用されたシリンダヘッドカバーの平面図。The top view of the cylinder head cover to which the oil level gauge insertion part structure which concerns on this invention was applied. 本発明の第１実施例のオイルレベルゲージ挿入部構造を示す断面図であり、図１のＡ−Ａ線に沿った断面図。It is sectional drawing which shows the oil level gauge insertion part structure of 1st Example of this invention, and sectional drawing along the AA line of FIG. 第１比較例のオイルレベルゲージ挿入部構造を示す断面図。Sectional drawing which shows the oil level gauge insertion part structure of a 1st comparative example. 第２比較例のオイルレベルゲージ挿入部構造を示す断面図。Sectional drawing which shows the oil level gauge insertion part structure of a 2nd comparative example. 本発明の第２実施例のオイルレベルゲージ挿入部構造を示す断面図。Sectional drawing which shows the oil level gauge insertion part structure of 2nd Example of this invention.

以下、本発明の一実施例を図面に基づいて詳細に説明する。図１は、本発明のオイルレベルゲージ挿入部構造が適用されたシリンダヘッドカバー１の平面図である。なお、本実施例におけるシリンダヘッドカバー１は、直列３気筒の内燃機関に適用されるものである。   Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view of a cylinder head cover 1 to which the oil level gauge insertion portion structure of the present invention is applied. The cylinder head cover 1 in this embodiment is applied to an inline three-cylinder internal combustion engine.

シリンダヘッドカバー１は、樹脂材料からなり、ロアカバー２と、ロアカバーよりも一回り小さいアッパカバー３と、から大略構成されている。シリンダヘッドカバー１の中央には、気筒列方向に沿って、点火プラグ（図示せず）が挿入されるプラグ挿入穴４が、ロアカバー２及びアッパカバー３を貫通するように形成されている。   The cylinder head cover 1 is made of a resin material, and generally includes a lower cover 2 and an upper cover 3 that is slightly smaller than the lower cover. A plug insertion hole 4 into which a spark plug (not shown) is inserted is formed in the center of the cylinder head cover 1 so as to penetrate the lower cover 2 and the upper cover 3 along the cylinder row direction.

ロアカバー２は、型成形されてなり、細長い矩形の深皿形状を呈し、その外周縁の全周に、シリンダヘッドに取り付けられる鍔状のフランジ５が形成されている。   The lower cover 2 is molded and has an elongated rectangular deep dish shape. A flange-like flange 5 attached to the cylinder head is formed on the entire outer periphery of the lower cover 2.

アッパカバー３は、型成形されてなり、細長い矩形の浅皿形状を呈し、ロアカバー２の上面に振動溶着により接合されている。   The upper cover 3 is molded, has an elongated rectangular shallow dish shape, and is joined to the upper surface of the lower cover 2 by vibration welding.

このシリンダヘッドカバー１は、ブローバイガス中のオイルミストを分離するオイルセパレータ６を有している。オイルミストセパレータ６は、ロアカバー２とアッパカバー３とによって画成される気筒列方向に沿った空間を利用したものであって、３つのプラグ挿入穴４の両側の２箇所に形成されている。   The cylinder head cover 1 has an oil separator 6 that separates oil mist in blow-by gas. The oil mist separator 6 uses a space along the cylinder row direction defined by the lower cover 2 and the upper cover 3, and is formed at two locations on both sides of the three plug insertion holes 4.

そして、本実施例においては、一方のオイルミストセパレータ６ａを上下に貫通するように、オイルレベルゲージが挿入されるオイルレベルゲージ挿入部７が形成されている。   In this embodiment, an oil level gauge insertion portion 7 into which an oil level gauge is inserted is formed so as to penetrate up and down one oil mist separator 6a.

本願発明の第１実施例のオイルレベルゲージ挿入部７は、図２に示すように、アッパカバー３側に形成されたアッパ挿入筒１１及び突条壁１２と、ロアカバー２側に形成されたロア挿入筒１３と、を有している。図２は、図１のＡ−Ａ線に沿った断面図である。   As shown in FIG. 2, the oil level gauge insertion portion 7 of the first embodiment of the present invention includes an upper insertion cylinder 11 and a ridge wall 12 formed on the upper cover 3 side, and a lower formed on the lower cover 2 side. And an insertion tube 13. FIG. 2 is a cross-sectional view taken along line AA in FIG.

アッパ挿入筒１１は、オイルレベルゲージ（図示せず）が挿入される筒状のものであり、シリンダヘッド側（図２おける下側）ほど内径が小さくなるように、内周面がテーパ状に形成されている。   The upper insertion cylinder 11 is a cylinder into which an oil level gauge (not shown) is inserted, and the inner peripheral surface is tapered so that the inner diameter becomes smaller toward the cylinder head side (lower side in FIG. 2). Is formed.

突条壁１２は、断面略矩形を呈し、ロアカバー２の上面側に向かってアッパカバー３から所定長さ突出し、アッパ挿入筒１１の周囲全周に亙って連続するよう環状に形成されている。   The ridge wall 12 has a substantially rectangular cross section, protrudes from the upper cover 3 by a predetermined length toward the upper surface side of the lower cover 2, and is formed in an annular shape so as to be continuous over the entire circumference of the upper insertion cylinder 11. .

ロア挿入筒１３は、アッパ挿入筒１１が挿入される筒状のものであり、アッパ挿入筒１１と突条壁１２との間で、その上端が全周に亙って連続してアッパカバー３に振動溶着により接合されている。つまり、アッパ挿入筒１１の外周側近傍位置において、アッパカバー３とロアカバー２とが接合されている。ロア挿入筒１３の上端面には、溶着リブ１４が全周に亙って突出形成されている。溶着リブ１４は、振動溶着の際に溶けてアッパカバー３に接合されるものである。ロア挿入筒１３の下端内周面には、アッパ挿入筒１１の下端の外周縁を受ける鍔状のフランジ部１５が突出形成されている。   The lower insertion cylinder 13 has a cylindrical shape into which the upper insertion cylinder 11 is inserted, and the upper cover 3 is continuously extended over the entire circumference between the upper insertion cylinder 11 and the ridge wall 12. Are joined by vibration welding. That is, the upper cover 3 and the lower cover 2 are joined at a position near the outer peripheral side of the upper insertion cylinder 11. A welding rib 14 is formed on the upper end surface of the lower insertion cylinder 13 so as to protrude over the entire circumference. The welding rib 14 is melted and joined to the upper cover 3 at the time of vibration welding. On the inner peripheral surface of the lower end of the lower insertion cylinder 13, a flange-like flange portion 15 that receives the outer peripheral edge of the lower end of the upper insertion cylinder 11 is formed to project.

なお、図２中の１６は、シリンダヘッド側のカムブラケット１７に形成されたオイルレベルゲージ挿入穴である。   2 is an oil level gauge insertion hole formed in the cam bracket 17 on the cylinder head side.

図３及び図４は、本願発明に対する比較例のオイルレベルゲージ挿入部構造をそれぞれ示したものである。なお、上述した本願発明の第１実施例と同一の構成の要素については、説明の便宜上、同一の符号を付し、重複する説明を省略する。   3 and 4 respectively show the oil level gauge insertion portion structure of a comparative example with respect to the present invention. In addition, about the element of the same structure as 1st Example of this invention mentioned above, the same code | symbol is attached | subjected for convenience of explanation, and the overlapping description is abbreviate | omitted.

図３に示す第１比較例のオイルレベルゲージ挿入部２１は、アッパカバー３に形成された筒状のアッパ挿入筒２３の下端とロアカバー２とが振動溶着により接合された構成となっている。   The oil level gauge insertion part 21 of the first comparative example shown in FIG. 3 has a configuration in which the lower end of a cylindrical upper insertion cylinder 23 formed on the upper cover 3 and the lower cover 2 are joined by vibration welding.

第１比較例におけるロアカバー２には、オイルレベルゲージが挿入されるオイルレベルゲージ挿入穴２５と、このオイルレベルゲージ挿入穴２５の外周縁近傍に全周に亙って突出形成された溶着リブ２６と、が形成されている。この溶着リブ２６は、振動溶着の際に溶けてアッパ挿入筒２３の下端に接合される。   In the lower cover 2 in the first comparative example, an oil level gauge insertion hole 25 into which an oil level gauge is inserted, and a welding rib 26 that is formed in the vicinity of the outer peripheral edge of the oil level gauge insertion hole 25 so as to protrude over the entire circumference. And are formed. The welding rib 26 melts at the time of vibration welding and is joined to the lower end of the upper insertion cylinder 23.

このような第１比較例においては、振動溶着の際に、溶着リブ２６とアッパ挿入筒２３との接合部分の内周側及び外周側にそれぞれ溶着リブ２６から溶けたバリが生じる。これらのバリの拡散を防止し、当該バリを覆い隠すためのリブ２７、２８をアッパ挿入筒２３の下端面に設定しようとすると、その分アッパ挿入筒２３の肉厚が厚くなってしまう。つまり型成形時のアンダーカットを考慮すると、アッパ挿入筒２３の肉厚がリブ２７、２８を含めた厚さとなり、アッパカバー３を型成形した際にアッパ挿入筒２３にひけが発生し易くなる。そのため、オイルレベルゲージが挿入されるアッパ挿入筒２３の形状が安定しなくなる虞がある。   In such a first comparative example, during vibration welding, burrs melted from the welding rib 26 are generated on the inner peripheral side and the outer peripheral side of the joint portion between the welding rib 26 and the upper insertion cylinder 23, respectively. If ribs 27 and 28 for preventing the diffusion of these burrs and concealing the burrs are set on the lower end surface of the upper insertion cylinder 23, the thickness of the upper insertion cylinder 23 increases accordingly. In other words, considering the undercut at the time of molding, the thickness of the upper insertion cylinder 23 is the thickness including the ribs 27 and 28, and sink marks are likely to occur in the upper insertion cylinder 23 when the upper cover 3 is molded. . Therefore, the shape of the upper insertion cylinder 23 into which the oil level gauge is inserted may not be stable.

また、この第１比較例では、アッパ挿入筒２３に溶着リブ２６が接合される構造となっているため、振動溶着時にアッパ挿入筒２３に大きな保持力（加圧力）が作用することになり、この点からもアッパ挿入筒２３の肉厚を厚くする必要があり、アッパ挿入筒２３にひけが発生し易くなる。   Further, in the first comparative example, since the welding rib 26 is joined to the upper insertion cylinder 23, a large holding force (pressing force) acts on the upper insertion cylinder 23 during vibration welding. Also in this respect, it is necessary to increase the thickness of the upper insertion cylinder 23, and sinking is likely to occur in the upper insertion cylinder 23.

図４に示す第２比較例のオイルレベルゲージ挿入部３１は、アッパカバー３に形成された筒状のアッパ挿入筒３３の外周側で、ロアカバー２に形成された筒状のロア挿入筒３５の上端とアッパカバー３とが振動溶着により接合された構成となっている。   The oil level gauge insertion portion 31 of the second comparative example shown in FIG. 4 is formed on the outer peripheral side of the cylindrical upper insertion tube 33 formed on the upper cover 3 and the cylindrical lower insertion tube 35 formed on the lower cover 2. The upper end and the upper cover 3 are joined by vibration welding.

第２比較例においては、アッパ挿入筒３３の外周側に、２つの環状の突条壁３６、３７が突出形成され、ロア挿入筒３５の上端面に全周に亙って溶着リブ３８が突出形成されている。ロア挿入筒３５上端の溶着リブ３８は、振動溶着の際に溶けてアッパ挿入筒３３の外側に位置する突条壁３６、３７間でアッパカバー３に接合される。   In the second comparative example, two annular projecting walls 36 and 37 project from the outer peripheral side of the upper insertion cylinder 33, and the welding rib 38 projects from the upper end surface of the lower insertion cylinder 35 over the entire circumference. Is formed. The welding rib 38 at the upper end of the lower insertion cylinder 35 is joined to the upper cover 3 between the ridge walls 36 and 37 that are melted during vibration welding and located outside the upper insertion cylinder 33.

このような第２比較例においては、振動溶着の際に、溶着リブ３８とアッパカバー３との接合部分の内周側及び外周側にそれぞれ溶着リブ３８から溶けたバリが生じる。これらのバリは、アッパカバー３に設けられた２つの突条壁３６、３７によって拡散が防止され、かつ覆い隠すことができる。   In such a second comparative example, during vibration welding, burrs melted from the welding rib 38 are generated on the inner peripheral side and the outer peripheral side of the joint portion between the welding rib 38 and the upper cover 3, respectively. These burrs are prevented from spreading by the two protruding walls 36 and 37 provided on the upper cover 3 and can be covered.

しかしながら、２つの突条壁３６、３７をアッパ挿入筒３３の外側に間隔を空けて設ける必要があり、これら２つの突条壁３６、３７を含めると、オイルレベルゲージ挿入部３１を形成するために必要なスペースは大きくなってしまい、シリンダヘッドカバー１の設計自由度が小さくなる虞がある。   However, it is necessary to provide two protruding walls 36 and 37 with a space outside the upper insertion cylinder 33, and when these two protruding walls 36 and 37 are included, the oil level gauge insertion portion 31 is formed. The required space for the cylinder head increases, and the degree of freedom in designing the cylinder head cover 1 may be reduced.

一方、上述した第１実施例のオイルレベルゲージ挿入部７においては、ロア挿入筒１３の上端とアッパカバー３との接合部分を、アッパ挿入筒１１の壁面を利用して覆い隠すことができる。そのため、アッパ挿入筒１１を利用せずにロア挿入筒１３の上端とアッパカバー３との接合部分を覆い隠す場合（例えば、上述の第２比較例）に比べて、ロア挿入筒１３の上端とアッパカバー３との接合部分を覆い隠す構造をアッパ挿入筒１１の半径方向で小さくすることができる。つまり、アッパ挿入筒１１の周囲の設計自由度を向上させることができる。例えば、第１実施例のように、アッパ挿入筒１１の位置が、シリンダヘッドカバー１の裏側に形成されたオイルミストセパレータ６と重なるような場合であっても、ロア挿入筒１３の上端とアッパカバー３との接合部分を覆い隠す構造をアッパ挿入筒１１の半径方向で小さくすることができるので、オイルミストセパレータ８の容積を十分確保することが可能となり、オイルミストセパレータ８の性能悪化を防止することができる。   On the other hand, in the oil level gauge insertion portion 7 of the first embodiment described above, the joint portion between the upper end of the lower insertion cylinder 13 and the upper cover 3 can be covered using the wall surface of the upper insertion cylinder 11. Therefore, the upper end of the lower insertion cylinder 13 is compared with the case where the joint between the upper end of the lower insertion cylinder 13 and the upper cover 3 is covered without using the upper insertion cylinder 11 (for example, the second comparative example described above). The structure that covers the joint portion with the upper cover 3 can be reduced in the radial direction of the upper insertion cylinder 11. That is, the degree of freedom in design around the upper insertion cylinder 11 can be improved. For example, even when the position of the upper insertion cylinder 11 overlaps with the oil mist separator 6 formed on the back side of the cylinder head cover 1 as in the first embodiment, the upper end of the lower insertion cylinder 13 and the upper cover 3 can be reduced in the radial direction of the upper insertion cylinder 11, so that a sufficient volume of the oil mist separator 8 can be secured, and performance deterioration of the oil mist separator 8 can be prevented. be able to.

また、アッパ挿入筒１１の下端をロアカバー２に接合するような構成（例えば、上述の第１比較例）に比べ、アッパ挿入筒１１の肉厚を相対的に薄く設定することが可能となり、アッパ挿入筒１１にひけが発生することを抑制できる。そのため、アッパ挿入筒１１の寸法精度が向上し、オイルレベルゲージの挿入性やシール性を向上させることができる。   In addition, compared with a configuration in which the lower end of the upper insertion cylinder 11 is joined to the lower cover 2 (for example, the first comparative example described above), the thickness of the upper insertion cylinder 11 can be set relatively thin. The occurrence of sink marks in the insertion tube 11 can be suppressed. Therefore, the dimensional accuracy of the upper insertion cylinder 11 can be improved, and the insertability and sealability of the oil level gauge can be improved.

そして、アッパ挿入筒１１の外周側近傍位置で、アッパカバー３とロアカバー２とを接合することで、筒状のアッパ挿入筒１１を所期位置で、かつ所期形状で保持し易くなり、アッパ挿入筒１１の中心軸とシリンダヘッド側のオイルレベルゲージ挿入孔１６との中心軸とのずれが抑制され、オイルレベルゲージの挿入性が向上する。   Then, by joining the upper cover 3 and the lower cover 2 at a position in the vicinity of the outer peripheral side of the upper insertion cylinder 11, the cylindrical upper insertion cylinder 11 can be easily held at the desired position and in the desired shape. Deviation between the central axis of the insertion cylinder 11 and the central axis of the oil level gauge insertion hole 16 on the cylinder head side is suppressed, and the insertability of the oil level gauge is improved.

図５は、本発明の第２実施例におけるオイルレベルゲージ挿入部４１を示している。この図５は、図１のＡ−Ａ線に沿った位置に相当する断面図である。   FIG. 5 shows an oil level gauge insertion portion 41 in the second embodiment of the present invention. FIG. 5 is a cross-sectional view corresponding to the position along the line AA in FIG.

この第２実施例のオイルレベルゲージ挿入部４１は、上述した第１実施例のオイルレベルゲージ挿入部７と略同一構成となっているが、ロア挿入筒１３先端の溶着リブ１４とアッパカバー３との接合部分の内周側に生じる溶着リブから溶け出したバリは、一部区間でアッパ挿入筒１１の壁面でなく、突条壁１２よりもアッパ挿入筒１１側（内周側）に位置する第２突条壁４２によって覆い隠されている。また、第２突条壁４２が設けられた区間では、ロア挿入筒１３のフランジ部１５も切り欠かれている。   The oil level gauge insertion portion 41 of the second embodiment has substantially the same configuration as the oil level gauge insertion portion 7 of the first embodiment described above, but the welding rib 14 and the upper cover 3 at the distal end of the lower insertion cylinder 13. The burr melted out from the welding rib generated on the inner peripheral side of the joint portion with the upper portion is not located on the wall surface of the upper insertion cylinder 11 in a part of the section, but on the upper insertion cylinder 11 side (inner peripheral side) rather than the ridge wall 12. The second ridge wall 42 is covered and hidden. Further, in the section where the second protruding wall 42 is provided, the flange portion 15 of the lower insertion cylinder 13 is also cut away.

オイルレベルゲージ挿入部４１周辺のレイアウト上の制約がアッパ挿入筒１１の外側全周ではない場合には、アッパ挿入筒１１外側のアッパ挿入筒１１周方向に沿った一部区間に、アッパカバー３から突出する第２突条壁４２を設け、当該一部区間では、突条壁１２と第２突条壁４２との間で、溶着リブ１４をアッパカバー３に接合するようにしてもよい。   When the layout restriction around the oil level gauge insertion portion 41 is not the entire outer circumference of the upper insertion cylinder 11, the upper cover 3 is provided in a partial section along the circumferential direction of the upper insertion cylinder 11 outside the upper insertion cylinder 11. A second rib wall 42 protruding from the second rib wall 42 may be provided, and the welding rib 14 may be joined to the upper cover 3 between the rib wall 12 and the second rib wall 42 in the partial section.

このような第２実施例のオイルレベルゲージ挿入部４１においても、上述した第１実施例のオイルレベルゲージ挿入部と略同様の作用効果を得ることができる。   In the oil level gauge insertion portion 41 of the second embodiment as described above, it is possible to obtain substantially the same effect as the oil level gauge insertion portion of the first embodiment described above.

なお、上述した各実施例においては、ロア挿入筒１３の上端が全周に亙って連続してアッパカバー３に対して振動溶着されているが、例えば、オイルレベルゲージ挿入部７、４１の一部がオイルミストセパレータ６から外れた位置に設定される場合等には、ロア挿入筒１３の上端が間欠的にアッパカバー３に対して接合（溶着）された構成としてもよい。   In each of the above-described embodiments, the upper end of the lower insertion cylinder 13 is continuously welded to the upper cover 3 over the entire circumference. For example, the oil level gauge insertion parts 7 and 41 In the case where a part is set at a position away from the oil mist separator 6, the upper end of the lower insertion cylinder 13 may be intermittently joined (welded) to the upper cover 3.

１…シリンダヘッドカバー
２…ロアカバー
３…アッパカバー
６…オイルミストセパレータ
７…オイルレベルゲージ挿入部
１１…アッパ挿入筒
１２…突条壁
１３…ロア挿入筒
１４…溶着リブ
１６…オイルレベルゲージ挿入穴
１７…カムブラケット DESCRIPTION OF SYMBOLS 1 ... Cylinder head cover 2 ... Lower cover 3 ... Upper cover 6 ... Oil mist separator 7 ... Oil level gauge insertion part 11 ... Upper insertion cylinder 12 ... Projection wall 13 ... Lower insertion cylinder 14 ... Welding rib 16 ... Oil level gauge insertion hole 17 ... Cam bracket

Claims (2)

シリンダヘッドに固定されるロアカバーと、該ロアカバーの上面に接合されるアッパカバーと、を備えたシリンダヘッドカバーに形成されるオイルレベルゲージ挿入部構造において、
オイルレベルゲージ挿入部は、上記アッパカバーに設けられ、オイルレベルゲージが挿入される筒状のアッパ挿入筒と、該アッパ挿入筒の周囲のアッパカバー側から上記ロアカバーの上面側に向かって突出する突条壁と、上記ロアカバーに設けられ、上記アッパ挿入筒が挿入される筒状のロア挿入筒と、を有し、
上記アッパ挿入筒と上記突条壁との間で上記ロア挿入筒の上端と上記アッパカバーとが接合され、
上記ロア挿入筒の上端と上記アッパカバーとの接合部分は、その外周側が上記突条壁によって覆われ、その内周側が上記アッパ挿入筒によって覆われていることを特徴とするオイルレベルゲージ挿入部構造。 In an oil level gauge insertion portion structure formed in a cylinder head cover, comprising: a lower cover fixed to the cylinder head; and an upper cover joined to the upper surface of the lower cover.
The oil level gauge insertion portion is provided in the upper cover, and protrudes from a cylindrical upper insertion cylinder into which the oil level gauge is inserted, from the upper cover side around the upper insertion cylinder toward the upper surface side of the lower cover. A ridge wall, and a cylindrical lower insertion cylinder provided on the lower cover and into which the upper insertion cylinder is inserted,
The upper end of the lower insertion cylinder and the upper cover are joined between the upper insertion cylinder and the ridge wall,
An oil level gauge insertion portion characterized in that the outer peripheral side of the joint portion between the upper end of the lower insertion cylinder and the upper cover is covered with the protruding wall, and the inner peripheral side is covered with the upper insertion cylinder. Construction. 上記ロア挿入筒の上端が全周に亙って連続して上記アッパカバーに接合されていることを特徴とする請求項１に記載のオイルレベルゲージ挿入部構造。   The oil level gauge insertion portion structure according to claim 1, wherein an upper end of the lower insertion cylinder is continuously joined to the upper cover over the entire circumference.
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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0663808U (en) * 1993-02-17 1994-09-09 株式会社豊田自動織機製作所 Oil level gauge guide
JP2000240423A (en) * 1999-02-22 2000-09-05 Honda Motor Co Ltd Head cover for engine
JP2004019572A (en) * 2002-06-18 2004-01-22 Honda Motor Co Ltd Oil level gauge fitting structure
JP2004036437A (en) * 2002-07-02 2004-02-05 Kubota Corp Oil level detector for engine
JP2009185637A (en) * 2008-02-04 2009-08-20 Aichi Mach Ind Co Ltd Attachment structure of guide pipe of oil level gage
JP2012057498A (en) * 2010-09-06 2012-03-22 Honda Motor Co Ltd Vehicular engine
JP2012229625A (en) * 2011-04-25 2012-11-22 Honda Motor Co Ltd Mounting structure of oil level gauge

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0663808U (en) * 1993-02-17 1994-09-09 株式会社豊田自動織機製作所 Oil level gauge guide
JP2000240423A (en) * 1999-02-22 2000-09-05 Honda Motor Co Ltd Head cover for engine
JP2004019572A (en) * 2002-06-18 2004-01-22 Honda Motor Co Ltd Oil level gauge fitting structure
JP2004036437A (en) * 2002-07-02 2004-02-05 Kubota Corp Oil level detector for engine
JP2009185637A (en) * 2008-02-04 2009-08-20 Aichi Mach Ind Co Ltd Attachment structure of guide pipe of oil level gage
JP2012057498A (en) * 2010-09-06 2012-03-22 Honda Motor Co Ltd Vehicular engine
JP2012229625A (en) * 2011-04-25 2012-11-22 Honda Motor Co Ltd Mounting structure of oil level gauge

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