JP5145055B2 - Valve timing variable device in internal combustion engine - Google Patents

Valve timing variable device in internal combustion engine Download PDF

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JP5145055B2
JP5145055B2 JP2008003959A JP2008003959A JP5145055B2 JP 5145055 B2 JP5145055 B2 JP 5145055B2 JP 2008003959 A JP2008003959 A JP 2008003959A JP 2008003959 A JP2008003959 A JP 2008003959A JP 5145055 B2 JP5145055 B2 JP 5145055B2
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valve
bearing cap
cap body
cam shaft
holder member
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JP2009167819A (en
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秀行 康
国彦 大久保
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Daihatsu Motor Co Ltd
Toyota Motor Corp
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Toyota Motor Corp
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Description

本発明は，内燃機関において，その吸気弁及び排気弁のいずれか一方又は両方におけるバルブタイミングを可変するための装置に関するものである。   The present invention relates to an apparatus for varying a valve timing in one or both of an intake valve and an exhaust valve in an internal combustion engine.

一般に，この種のバルブタイミング可変装置は，クランク軸からカム軸への動力伝達部に，カム軸の回転をクランク軸の回転に対して進み又は遅らせるように作動する油圧式可変機構を設け，この油圧式の可変機構への油圧を油圧コントロール弁にて切り換え制御することにより，バルブタイミングの変更を行うように構成している。   In general, this type of valve timing varying device is provided with a hydraulic variable mechanism that operates to advance or retard the rotation of the camshaft relative to the rotation of the crankshaft in the power transmission portion from the crankshaft to the camshaft. The valve timing is changed by switching the hydraulic pressure to the hydraulic variable mechanism with a hydraulic control valve.

この場合，先行技術としての特許文献１には，シリンダヘッドの上面において，吸気弁又は排気弁に対するカム軸の上半分を軸支する軸受けキャップ体の上面に，前記シリンダヘッド側における油圧供給源及びカム軸における油圧式可変機構に連通するオイル通路を開口する一方，前記シリンダヘッドの上面の全体を覆うヘッドカバーの内部に，油圧コントロール弁とこの油圧コントロール弁へのオイル通路を備えた弁ホルダー部材を，その下面が前記軸受けキャップ体の上面に密着するように配設して，この密着面において，前記弁ホルダー部材におけるオイル通路が前記軸受けキャップ体におけるオイル通路に連通するように構成し，前記ヘッドカバー及び前記弁ホルダー部材を，前記ヘッドカバーにおける上面側から貫通して挿入したボルトにて，前記軸受けキャップ体に対して締結するという構成にすることを提案している。   In this case, in Patent Document 1 as a prior art, a hydraulic pressure supply source on the cylinder head side and an upper surface of a bearing cap body that supports an upper half of a cam shaft with respect to an intake valve or an exhaust valve are provided on the upper surface of the cylinder head. An oil passage communicating with the hydraulic variable mechanism in the camshaft is opened, and a valve control member having a hydraulic control valve and an oil passage to the hydraulic control valve is provided inside the head cover that covers the entire upper surface of the cylinder head. The lower surface of the bearing cap body is disposed in close contact with the upper surface of the bearing cap body, and the oil passage in the valve holder member communicates with the oil passage in the bearing cap body on the contact surface. And the valve holder member is inserted through from the upper surface side of the head cover. At belt, it proposes to the configuration in which fastened to the bearing cap bodies.

また，先行技術としての前記特許文献１においては，前記した構成のままでは，前記ヘッドカバーをシリンダヘッドに対して組み付ける途中で前記弁ホルダー部材が前記ヘッドカバーから落下したり横ずれしたりするから，前記弁ホルダー部材に，前記ヘッドカバーを貫通してその上面にまで突出するボス部を一体に設け，このボス部のうち前記ヘッドカバーの上面より突出する部分に，抜け止め部品を合成樹脂の熱融着にて固着することによって，前記弁ホルダー部材を前記ヘッドカバー内に組み付けるように構成することを提案している。
特開２００７−１００６５７号公報 Further, in the above-mentioned Patent Document 1 as the prior art, the valve holder member falls from the head cover or shifts laterally during the assembly of the head cover to the cylinder head in the above-described configuration. The holder member is integrally provided with a boss portion that penetrates the head cover and protrudes to the upper surface, and a retaining part is attached to the portion of the boss portion that protrudes from the upper surface of the head cover by heat-sealing synthetic resin. It is proposed that the valve holder member is assembled in the head cover by being fixed.
Japanese Patent Application Laid-Open No. 2007-1000065

しかし，前記弁ホルダー部材の前記ヘッドカバー内への組み付け構造が，先行技術のような構成である場合には，前記弁ホルダー部材の分解が不能であるか，或いは，極めて困難であり，しかも，弁ホルダー部材に一体に設けたボス部が前記ヘッドカバーを貫通する部分からのオイル漏れが発生するおそれがあるという問題があった。   However, when the structure for assembling the valve holder member into the head cover is a structure as in the prior art, the valve holder member cannot be disassembled or is extremely difficult, and the valve There is a problem that oil leakage may occur from a portion where the boss portion provided integrally with the holder member penetrates the head cover.

本発明は，これらの問題を解消したバルブタイミング可変装置を提供することを技術的課題とする。   This invention makes it a technical subject to provide the valve timing variable apparatus which eliminated these problems.

この技術的課題を達成するため本発明の請求項１は，
「シリンダヘッド上面におけるカム軸を軸支する軸受けキャップ体の上面に，前記シリンダヘッド側における油圧供給源及び前記カム軸に設けられている油圧式可変機構へのオイル通路を開口する一方，前記シリンダヘッド上面を覆うヘッドカバーの内部に，前記油圧式可変機構に対する油圧コントロール弁とこの油圧コントロール弁へのオイル通路を備えた弁ホルダー部材を，その下面が前記軸受けキャップ体の上面に密着接合するように配設して，この密着接合面で，前記弁ホルダー部材の各オイル通路が前記軸受けキャップ体の各オイル通路に連通する構成にし，更に，前記ヘッドカバー及び前記弁ホルダー部材を，前記ヘッドカバーにおける上面側から貫通して挿入した貫通ボルトにて，前記軸受けキャップ体に対して締結して成るバルブタイミング可変装置において，
前記弁ホルダー部材を，前記ヘッドカバーの内部に，当該ヘッドカバーを貫通しないように着脱可能に挿入した差込み部材にて，脱落及び横ずれ不能に取付ける一方，前記シリンダヘッド側に，前記差込み部材に対して，当該差込み部材における差し込み長さ寸法より狭い間隔を隔てて対峙する抜け阻止部を設ける一方，
前記カム軸が，吸気弁用カム軸と排気弁用カム軸から成り，前記軸受けキャップ体が，吸気弁用カム軸に対する軸受けキャップ体と排気弁用カム軸に対する軸受けキャップ体から成り，前記弁ホルダー部材が，吸気弁用カム軸に対する弁ホルダー部材と排気弁用カム軸に対する弁ホルダー部材とを一体にした構成であり，更に，前記差込み部材が，前記吸気弁用弁ホルダー部材と排気弁用弁ホルダー部材の両者を同時に脱落及び横ずれ不能に取付ける構成であり，
更に，前記吸気弁用カム軸に対する軸受けキャップ体と排気弁用カム軸に対する軸受けキャップ体とは，前記両カム軸におけるスプロケットに巻掛けしたタイミングチエンに隣接する部位に位置し，その間の部分には，前記タイミングチエンのうち両スプロケット間の部分に対するチエンガイド用の支持ブラケットが取付けられており，前記抜け阻止部が，前記チエンガイド用支持ブラケットである。」
ことを特徴としている。 In order to achieve this technical problem, claim 1 of the present invention provides:
“On the upper surface of the bearing cap body that pivotally supports the cam shaft on the upper surface of the cylinder head, an oil passage to the hydraulic supply source on the cylinder head side and the hydraulic variable mechanism provided on the cam shaft is opened. Inside the head cover that covers the upper surface of the head, a hydraulic control valve for the hydraulic variable mechanism and a valve holder member having an oil passage to the hydraulic control valve are attached so that the lower surface thereof is in close contact with the upper surface of the bearing cap body. The oil passages of the valve holder member communicate with the oil passages of the bearing cap body at the tight joint surface, and the head cover and the valve holder member are connected to the upper surface side of the head cover. Fastened to the bearing cap body with a through-bolt inserted through In Lube timing varying device,
The valve holder member is attached to the inside of the head cover so as not to fall off and to be laterally displaced by an insertion member that is detachably inserted so as not to penetrate the head cover, while on the cylinder head side with respect to the insertion member, While providing a slip-off prevention portion that faces the insertion member at a distance narrower than the insertion length dimension ,
The cam shaft comprises an intake valve cam shaft and an exhaust valve cam shaft, and the bearing cap body comprises a bearing cap body for the intake valve cam shaft and a bearing cap body for the exhaust valve cam shaft, and the valve holder The member has a structure in which a valve holder member for the intake valve cam shaft and a valve holder member for the exhaust valve cam shaft are integrated, and the insertion member includes the intake valve valve holder and the exhaust valve valve. It is configured to attach both of the holder members at the same time so that they cannot be detached and laterally displaced.
Furthermore, the bearing cap body for the camshaft for the intake valve and the bearing cap body for the camshaft for the exhaust valve are located at portions adjacent to the timing chain wound on the sprockets on both camshafts. A support bracket for a chain guide is attached to a portion between the two sprockets in the timing chain, and the removal preventing portion is the support bracket for the chain guide . "
It is characterized by that.

請求項１の構成によると，ヘッドカバーは，これをシリンダヘッドに対して貫通ボルトにて取り付ける以前において，予め，その内部に弁ホルダー部材を差込み部材にて脱落及び横ずれ不能に組み付けることができる。   According to the configuration of the first aspect, before the head cover is attached to the cylinder head with the through bolt, the valve holder member can be assembled in advance with the insertion member so that the head cover cannot be dropped and laterally displaced.

これにより，前記ヘッドカバーを，シリンダヘッドに対して，当該ヘッドカバー内に弁ホルダー部材をシリンダヘッド側の軸受けキャップ体に位置を合わせながら組み付けることの作業が容易になり，これに要する手数及び時間を大幅に低減できるとともに，組み付ける途中で前記弁ホルダー部材等の部品を損傷するおそれを確実に低減できる。   This facilitates the work of assembling the head cover with respect to the cylinder head while aligning the valve holder member with the bearing cap body on the cylinder head side within the head cover, greatly increasing the number of steps and time required for this. In addition, the risk of damaging components such as the valve holder member during assembly can be reliably reduced.

この場合，前記弁ホルダー部材に対する差込み部材は，前記ヘッドカバーの内部からこれを貫通しないように着脱可能に挿入するという構成であるから，ヘッドカバーの内部における潤滑油が，前記差込み部材より外側に漏れ出ること，オイル漏れが発生するおそれを確実に解消できる。   In this case, since the insertion member with respect to the valve holder member is configured to be detachably inserted from the inside of the head cover so as not to penetrate, the lubricating oil inside the head cover leaks outside the insertion member. In addition, the risk of oil leakage can be reliably eliminated.

これに加えて，前記弁ホルダー部材に対する差込み部材には，前記シリンダヘッド側に設けた抜け阻止部が，当該差込み部材における差し込み長さ寸法より狭い間隔を隔てて対峙していることにより，前記差込み部材が，その振動等にて緩むことはあっても，抜け落ちることを確実に阻止できるから，前記差込み部材の抜け落ちによる損傷を招来することがない。   In addition, the insertion member with respect to the valve holder member has a removal prevention portion provided on the cylinder head side facing each other with an interval narrower than the insertion length dimension of the insertion member. Even if the member is loosened due to the vibration or the like, it can be reliably prevented from falling off, so that damage due to the dropout of the insertion member is not caused.

また，請求項１においては，前記カム軸が，吸気弁用カム軸と排気弁用カム軸から成り，前記軸受けキャップ体が，吸気弁用カム軸に対する軸受けキャップ体と排気弁用カム軸に対する軸受けキャップ体から成り，前記弁ホルダー部材が，吸気弁用カム軸に対する弁ホルダー部材と排気弁用カム軸に対する弁ホルダー部材とを一体にした構成であり，更に，前記差込み部材が，前記吸気弁用弁ホルダー部材と排気弁用弁ホルダー部材の両者を同時に脱落及び横ずれ不能に取付ける構成であることにより，吸気弁用カム軸と排気弁用カム軸との両方にバルブタイミング可変装置を設ける場合に，前記差込み部材を，吸気弁用カム軸に対する弁ホルダー部材と吸気弁用カム軸に対する弁ホルダー部材とに共用できるから，構造の簡単化を図ることができる利点がある。 According to a first aspect of the present invention, the cam shaft includes an intake valve cam shaft and an exhaust valve cam shaft, and the bearing cap body is a bearing cap body for the intake valve cam shaft and a bearing for the exhaust valve cam shaft. The valve holder member has a structure in which a valve holder member for the intake valve camshaft and a valve holder member for the exhaust valve camshaft are integrated, and the insertion member is for the intake valve. When both the intake valve camshaft and the exhaust valve camshaft are provided with variable valve timing devices, both the valve holder member and the exhaust valve valve holder member are mounted so that they cannot be detached and laterally displaced. Since the insertion member can be shared by the valve holder member for the intake valve camshaft and the valve holder member for the intake valve camshaft, the structure can be simplified. There is an advantage that can be.

更に，請求項１においては，前記吸気弁用カム軸に対する軸受けキャップ体と排気弁用カム軸に対する軸受けキャップ体とは，前記両カム軸におけるスプロケットに巻掛けしたタイミングチエンに隣接する部位に位置し，その間の部分には，前記タイミングチエンのうち両スプロケット間の部分に対するチエンガイド用の支持ブラケットが取付けられており，前記抜け阻止部が，前記チエンガイド用支持ブラケットであることにより，従来の内燃機関に設けられているチエンガイド用支持ブラケットを，そのまま，前記差込み部材に対する抜け阻止部に利用できる利点がある。 According to a first aspect of the present invention, the bearing cap body for the intake valve cam shaft and the bearing cap body for the exhaust valve cam shaft are located at portions adjacent to the timing chain wound around the sprockets of the both cam shafts. , A support bracket for a chain guide is attached to the portion between the sprockets of the timing chain, and the slip-off prevention portion is the support guide for the chain guide. There is an advantage that the support bracket for the chain guide provided in the engine can be used as it is as a slip-off preventing portion for the insertion member .

以下，本発明の実施の形態を，図１〜図６の図面について説明する。   Hereinafter, embodiments of the present invention will be described with reference to FIGS.

これらの図において，符号１は，内燃機関におけるシリンダヘッドを，符号２は，前記シリンダヘッド１の上面を覆うヘッドカバーを各々示し，前記ヘッドカバー２は，合成樹脂又はアルミ等の軽合金製であり，前記シリンダヘッド１の上面に，複数本のボルト３にて着脱可能に接合される。   In these drawings, reference numeral 1 denotes a cylinder head in the internal combustion engine, reference numeral 2 denotes a head cover that covers the upper surface of the cylinder head 1, and the head cover 2 is made of a light alloy such as synthetic resin or aluminum, A plurality of bolts 3 are detachably joined to the upper surface of the cylinder head 1.

前記シリンダヘッド１の上面には，吸気弁用のカム軸４及び排気弁用のカム軸５が互いに平行にして配設されており，これら両カム軸４，５は，前記シリンダヘッド１側に一体に設けた下半分の軸受け部６，７と，これにボルト８にて締結される上半分の軸受けキャップ体９，１０とによって回転自在に軸支されている。   On the upper surface of the cylinder head 1, an intake valve cam shaft 4 and an exhaust valve cam shaft 5 are arranged in parallel to each other. Both the cam shafts 4 and 5 are disposed on the cylinder head 1 side. The lower half bearing portions 6, 7 provided integrally and the upper half bearing cap bodies 9, 10 fastened thereto by bolts 8 are rotatably supported.

前記両カム軸４，５における一端部には，図示しないクランク軸との間にタイミングチエン１１が巻掛けされるスプロケット１２，１３と，前記各カム軸４，５の回転を前記クランク軸の回転に対して進み又は遅らせるように作動する従来周知の油圧式可変機構１４，１５とが設けられている。   One end of each of the camshafts 4 and 5 is sprockets 12 and 13 around which a timing chain 11 is wound between a crankshaft (not shown), and the rotation of the camshafts 4 and 5 is the rotation of the crankshaft. Conventionally known hydraulic variable mechanisms 14 and 15 are provided which operate so as to advance or retard.

前記吸気弁用軸受けキャップ体９と前記排気弁用軸受けキャップ体１０とは，その間における連結部１６にて一体に連結して成るというように，一つの部品に構成されており，これらの各軸受けキャップ体９，１０の上面９ａ，１０ａには，前記シリンダヘッド１側における油圧供給源からのオイル通路１７，１８と，前記各カム軸４，５における油圧式可変機構１４，１５に対する二本のオイル通路１９ａ，１９ｂ，２０ａ，２０ｂが開口している。   The intake valve bearing cap body 9 and the exhaust valve bearing cap body 10 are formed as a single component such that they are integrally connected by a connecting portion 16 therebetween. The upper surfaces 9a and 10a of the cap bodies 9 and 10 are provided with two oil passages 17 and 18 from a hydraulic pressure supply source on the cylinder head 1 side, and two hydraulic variable mechanisms 14 and 15 for the camshafts 4 and 5 respectively. Oil passages 19a, 19b, 20a, and 20b are opened.

前記吸気弁用軸受けキャップ体９の上面９ａには，吸気弁用の油圧コントロール弁２１を備えた弁ホルダー部材２２が配設されている一方，前記排気弁用軸受けキャップ体１０の上面１０ａには，排気弁用の油圧コントロール弁２３を備えた弁ホルダー部材２４が配設されており，これら各弁ホルダー部材２２，２４は，その間における連結部２５を介して一体に連結して成るというように，一つの部品に構成されている。   A valve holder member 22 having an intake valve hydraulic control valve 21 is disposed on the upper surface 9a of the intake valve bearing cap body 9, while an upper surface 10a of the exhaust valve bearing cap body 10 is disposed on the upper surface 9a. , A valve holder member 24 having a hydraulic control valve 23 for the exhaust valve is disposed, and these valve holder members 22 and 24 are integrally connected via a connecting portion 25 therebetween. , Is composed of one part.

前記吸気弁用弁ホルダー部材２２には，前記吸気弁用軸受けキャップ体９の上面９ａに後述するガスケット２６を挟んで密接する下面２２ａを備えるとともに，その油圧コントロール弁２１への三つのオイル通路２７，２８ａ，２８ｂが前記下面２２ａに開口するように形成されている。   The intake valve holder member 22 includes a lower surface 22a that is in close contact with an upper surface 9a of the intake valve bearing cap body 9 with a gasket 26, which will be described later, interposed therebetween, and three oil passages 27 to the hydraulic control valve 21. , 28a, 28b are formed so as to open in the lower surface 22a.

前記排気弁用弁ホルダー部材２４には，前記排気弁用軸受けキャップ体１０の上面１０ａに後述するガスケット２９を挟んで密接する下面２４ａを備えるとともに，その油圧コントロール弁２３への三つのオイル通路３０，３１ａ，３１ｂが前記下面２４ａに開口するように形成されている。   The exhaust valve valve holder member 24 is provided with a lower surface 24a that is in close contact with an upper surface 10a of the exhaust valve bearing cap body 10 with a gasket 29 described later interposed therebetween, and three oil passages 30 to the hydraulic control valve 23. , 31a, 31b are formed to open to the lower surface 24a.

前記ヘッドカバー２と，一つの部品を構成する前記吸気弁用弁ホルダー部材２２及び前記排気弁用弁ホルダー部材２４とは，前記両軸受けキャップ体９，１０の各々に対して，前記ヘッドカバー２における上面側からこれらを貫通して前記各軸受けキャップ体９，１０に一体に設けたボス部９ｂ，１０ｂに螺合するように挿入した貫通ボルト３２にて締結されており，この締結により，前記吸気弁用軸受けキャップ体９の上面９ａに開口する各オイル通路１７，１９ａ，１９ｂが前記吸気弁用弁ホルダー部材２２の下面２２ａに開口する各オイル通路２７，２８ａ，２８ｂに連通し，前記排気弁用軸受けキャップ体１０の上面１０ａに開口する各オイル通路１８，２０ａ，２０ｂが前記排気弁用弁ホルダー部材２４の下面２４ａに開口する各オイル通路３０，３１ａ，３１ｂに連通するように構成している。   The head cover 2 and the intake valve valve holder member 22 and the exhaust valve valve member 24 constituting one part are arranged on the upper surface of the head cover 2 with respect to each of the bearing cap bodies 9 and 10. They are fastened by through bolts 32 that pass through them from the side and are inserted so as to be screwed into the boss portions 9b, 10b provided integrally with the bearing cap bodies 9, 10, respectively. The oil passages 17, 19a, 19b that open to the upper surface 9a of the bearing cap body 9 communicate with the oil passages 27, 28a, 28b that open to the lower surface 22a of the intake valve valve holder member 22, respectively. Each oil passage 18, 20a, 20b that opens to the upper surface 10a of the bearing cap body 10 opens to the lower surface 24a of the valve holder member 24 for the exhaust valve. Yl passage 30,31A, is configured to communicate to 31b.

なお，前記吸気弁用弁ホルダー部材２２における油圧コントロール弁２１，及び，前記排気弁用弁ホルダー部材２４における油圧コントロール弁２３は，図２に示すように，その作動アクチェータタ２１ａ，２３の部分が前記ヘッドカバー２に一体に設けたボス部２ａ，２ｂから外側に突出するという構成になっている。   As shown in FIG. 2, the hydraulic control valve 21 in the intake valve holder member 22 and the hydraulic control valve 23 in the exhaust valve holder member 24 have operating actuators 21a and 23 as shown in FIG. The bosses 2a and 2b provided integrally with the head cover 2 project outward.

また，前記吸気弁用軸受けキャップ体９の上面９ａと前記吸気弁用弁ホルダー部材２２の下面２２ａとの間に介挿するガスケット２６，及び，前記排気弁用軸受けキャップ体１０の上面１０ａと前記排気弁用弁ホルダー部材２４の下面２４ａとの間に介挿するガスケット２９は，そのいずれも，図５に示すように，適宜メッシュの金網等の網体を基調とし，その網目のうち前記各オイル通路の以外の部分をゴム等の軟質弾性体にて塞いで成る構成であり，密接接合面のシールと，油圧のオイルフィルタとの両方を兼ねている。   Further, the gasket 26 interposed between the upper surface 9a of the intake valve bearing cap body 9 and the lower surface 22a of the intake valve valve holder member 22, the upper surface 10a of the exhaust valve bearing cap body 10, and the above-mentioned As shown in FIG. 5, each of the gaskets 29 interposed between the lower surface 24a of the valve holder member 24 for the exhaust valve is appropriately based on a mesh body such as a mesh metal mesh. The structure other than the oil passage is covered with a soft elastic body such as rubber and serves as both a tightly joined surface seal and a hydraulic oil filter.

前記密接接合面のシールにおいては，前記ガスケット２６，２９を使用することに代えて，又は，前記ガスケット２６，２９に加えて，前記弁ホルダー部材２２，２４の下面２２ａ，２４ａ又は軸受けキャップ体９，１０の上面９ａ，１０ａに，オイル通路を囲うＯリングを設ける構成にすることができる。   In the sealing of the intimately joined surface, instead of using the gaskets 26 and 29, or in addition to the gaskets 26 and 29, the lower surfaces 22a and 24a of the valve holder members 22 and 24 or the bearing cap body 9 , 10 can be provided with O-rings surrounding the oil passages on the upper surfaces 9a, 10a.

更にまた，前記各貫通ボルト３２には，合成樹脂製ヘッドカバー２の過度の締結を阻止するとともに位置決めするためのリング体３３と，潤滑油の漏れを阻止するためのシール体３４とが設けられている。   Furthermore, each through bolt 32 is provided with a ring body 33 for preventing and positioning the synthetic resin head cover 2 excessively, and a seal body 34 for preventing leakage of lubricating oil. Yes.

そして，前記吸気弁用弁ホルダー部材２２と前記排気弁用弁ホルダー部材２４との間に位置してその両者を一体に連結する連結部２５には，貫通孔３５を穿設し，この貫通孔３５内に，本発明における差込み部材としての一つの実施の形態であるところの一本の頭付きボルト３６を，下側から上向きに差し込んで，これを前記ヘッドカバー２の下面に貫通しないように一体に設けたボス部３７内に固着の金属製ナット３８に螺合して締結することにより，前記ヘッドカバー２の内部に，前記吸気弁用弁ホルダー部材２２及び前記排気弁用弁ホルダー部材２４を，前記一本の頭付きボルト３６にて，脱落及び横ずれ不能に組み付けるという構成にしている。   Further, a through hole 35 is formed in a connecting portion 25 that is located between the intake valve valve holder member 22 and the exhaust valve valve holder member 24 and integrally connects them. One headed bolt 36, which is one embodiment as an insertion member in the present invention, is inserted into the upper portion 35 from the lower side so as not to penetrate the lower surface of the head cover 2. The intake valve valve holder member 22 and the exhaust valve valve holder member 24 are placed inside the head cover 2 by screwing and fastening to a fixed metal nut 38 in a boss portion 37 provided in The single head-mounted bolt 36 is assembled so that it cannot be dropped off or laterally displaced.

一方，前記クランク軸と，両カム軸４，５におけるスプロケット１２，１３とに巻掛けしたタイミングチエン１１のうち前記両スプロケット１２，１３間の部分には，当該タイミングチエン１１に対するチエンガイド３９が設けられ，このチエンガイド３９を支持するブラケット４０の基端部は，前記吸気弁用軸受けキャップ体９と前記排気弁用軸受けキャップ体１０との間に位置してその両者を一体に連結する連結部１６の上面に，複数本のボルト４１による締結にて取付けられている。   On the other hand, among the timing chains 11 wound around the crankshaft and the sprockets 12 and 13 of the camshafts 4 and 5, a chain guide 39 for the timing chain 11 is provided in the portion between the sprockets 12 and 13. The base end portion of the bracket 40 that supports the chain guide 39 is located between the intake valve bearing cap body 9 and the exhaust valve bearing cap body 10 and connects the two together. It is attached to the upper surface of 16 by fastening with a plurality of bolts 41.

この場合，前記チエンガイド用ブラケット４０の基端部を，前記頭付きボルト３６の下端に対して，当該頭付きボルト３６におけるナット３８への螺合長さ寸法Ｓ２に前記連結部２５の厚さ寸法を加えた差し込み長さ寸法Ｓ１よりも狭い隙間寸法Ｓ３の間隔を隔てて対峙することにより，前記頭付きボルト３６に対する抜け阻止部に構成している。   In this case, the thickness of the connecting portion 25 is set so that the base end portion of the chain guide bracket 40 is screwed to the nut 38 of the head bolt 36 with respect to the lower end of the head bolt 36. By facing each other with a gap dimension S3 that is narrower than the insertion length dimension S1 to which the dimension is added, a removal preventing portion for the head bolt 36 is formed.

この構成において，ヘッドカバー２は，これをシリンダヘッド１に対して貫通ボルト３３にて取り付ける以前において，図４に示すように，予め，その内部に両弁ホルダー部材２２，２４を頭付きボルト３６にて脱落及び横ずれ不能に組み付けることができるから，前記ヘッドカバー２を，シリンダヘッド１に対して，当該ヘッドカバー２内における両弁ホルダー部材２２，２４をシリンダヘッド１側の両軸受けキャップ体９，１０の各々に位置を合わせながら組み付けることの作業が容易に且つ正確にできる。   In this configuration, before the head cover 2 is attached to the cylinder head 1 with the through bolts 33, as shown in FIG. Thus, the head cover 2 can be assembled to the cylinder head 1 so that the valve cover members 22 and 24 in the head cover 2 are not attached to the bearing cap bodies 9 and 10 on the cylinder head 1 side. The operation of assembling while adjusting the position can be easily and accurately performed.

この場合において，差し込み部材を構成する前記頭付きボルト３６は，前記ヘッドカバー２の内部からこれを貫通しないように着脱可能に挿入するという構成であるから，ヘッドカバー２の内部における潤滑油が，前記頭付きボルト３６より外側に漏れ出ることはなく，オイル漏れが発生することを確実に阻止できる。   In this case, since the bolt 36 with a head constituting the insertion member is detachably inserted from the inside of the head cover 2 so as not to penetrate the head cover 2, the lubricating oil inside the head cover 2 is prevented from being inserted into the head cover 2. There is no leakage outside the attachment bolt 36, and oil leakage can be reliably prevented.

しかも，差し込み部材を構成する前記頭付きボルト３６には，前記チエンガイド３９の支持ブラケット４０が，抜け阻止部として，当該頭付きボルト３６における差し込み長さ寸法Ｓ１より狭い隙間寸法Ｓ３を隔てて対峙していることにより，前記頭付きボルト３６は，振動等にて緩むことはあっても，抜け落ちることを確実に阻止できる。   Moreover, the support bracket 40 of the chain guide 39 is opposed to the head bolt 36 constituting the insertion member with a gap dimension S3 narrower than the insertion length dimension S1 of the head bolt 36 as a removal prevention portion. As a result, the headed bolt 36 can be reliably prevented from falling off even if it is loosened by vibration or the like.

なお，前記隙間寸法Ｓ３を，前記頭付きボルト３６における螺合長さ寸法Ｓ２より狭い寸法に構成することにより，前記頭付きボルト３６が，これが螺合するナット３８から外れることを阻止できる。   By configuring the gap dimension S3 to be narrower than the screwing length dimension S2 of the headed bolt 36, the headed bolt 36 can be prevented from coming off from the nut 38 to which it is screwed.

前記実施の形態は，前記チエンガイド３９の支持ブラケット４０を，差し込み部材である前記頭付きボルト３６に対する抜け阻止部として利用した場合であったが，本発明はこれに限らず，シリンダヘッド１側に前記抜け阻止部とは別の目的で取付けられる各種の部品，例えば，前記軸受けキャップ体９，１０又はオイル飛散防止部材等を前記抜け阻止部として利用することができるほか，場合によっては，シリンダヘッド１側に，専用の抜け阻止部を設けるという構成にできる。   In the above-described embodiment, the support bracket 40 of the chain guide 39 is used as a removal prevention portion for the headed bolt 36 that is an insertion member. However, the present invention is not limited to this, and the cylinder head 1 side is used. In addition to the various parts attached for the purpose other than the slip-off prevention part, for example, the bearing cap bodies 9, 10 or the oil scattering prevention member can be used as the slip-off prevention part. It can be configured such that a dedicated removal prevention portion is provided on the head 1 side.

特に，抜け阻止部として，前記実施の形態のように，チエンガイド３９の支持ブラケット４０を抜け阻止部とした場合には，従来から存在するチエンガイド用支持ブラケットを利用できる利点がある。   In particular, when the support bracket 40 of the chain guide 39 is used as a slip-off prevention portion as in the above-described embodiment, there is an advantage that a conventional chain guide support bracket can be used.

また，前記差し込み部材は，実施の形態のように，前記頭付きボルト３６に構成することに限らず，押し込みピンの構成にすることができるほか，前記吸気弁用弁ホルダー部材２２と，前記排気弁用弁ホルダー部材２４とが一体化されてない構成である場合には，その各々に，差し込み部材を設けるという構成にすることができる。   In addition, the insertion member is not limited to the headed bolt 36 as in the embodiment, but may be a push-in pin configuration, the intake valve valve holder member 22 and the exhaust valve. In the case where the valve holder member 24 for valves is not integrated with each other, an insertion member can be provided for each of them.

内燃機関の要部縦断正面図で図２のＩ−Ｉ視断面図である。FIG. 3 is a cross-sectional front view taken along the line II of FIG. 図１のII−II視断面図である。FIG. 2 is a sectional view taken along line II-II in FIG. 1. 図１のIII −III 視断面図である。FIG. 3 is a sectional view taken along line III-III in FIG. 1. 分解した状態を示す図である。It is a figure which shows the state decomposed | disassembled. ガスケットの斜視図である。It is a perspective view of a gasket. 図５のVI−VI視拡大断面図である。FIG. 6 is an enlarged sectional view taken along line VI-VI in FIG. 5.

符号の説明Explanation of symbols

１ シリンダヘッド
２ ヘッドカバー
４ 吸気弁用カム軸
５ 排気弁用カム軸
９，１０ 軸受けキャップ体
９ａ，１０ａ 軸受けキャップ体の上面
１１ タイミングチエン
１２，１３ スプロケット
１４，１５ 油圧式可変機構
１６ 連結部
２１，２３ 油圧コントロール弁
２２，２４ 弁ホルダー部材
２２ａ，２４ａ 弁ホルダー部材の下面
２５ 連結部
２６，２９ ガスケット
３２ 貫通ボルト
３６ 頭付きボルト（差し込み部材）
４０ チエンガイドの支持ブラケット（抜け阻止部） DESCRIPTION OF SYMBOLS 1 Cylinder head 2 Head cover 4 Intake valve cam shaft 5 Exhaust valve cam shaft 9, 10 Bearing cap body 9a, 10a Upper surface of bearing cap body 11 Timing chain 12, 13 Sprocket 14, 15 Hydraulic variable mechanism 16 Connecting part 21, 23 Hydraulic control valve 22, 24 Valve holder member 22a, 24a Bottom surface of valve holder member 25 Connecting portion 26, 29 Gasket 32 Through bolt 36 Head bolt (insertion member)
40 Chain guide support bracket

Claims (1)

シリンダヘッド上面におけるカム軸を軸支する軸受けキャップ体の上面に，前記シリンダヘッド側における油圧供給源及び前記カム軸に設けられている油圧式可変機構へのオイル通路を開口する一方，前記シリンダヘッド上面を覆うヘッドカバーの内部に，前記油圧式可変機構に対する油圧コントロール弁とこの油圧コントロール弁へのオイル通路を備えた弁ホルダー部材を，その下面が前記軸受けキャップ体の上面に密着接合するように配設して，この密着接合面で，前記弁ホルダー部材の各オイル通路が前記軸受けキャップ体の各オイル通路に連通する構成にし，更に，前記ヘッドカバー及び前記弁ホルダー部材を，前記ヘッドカバーにおける上面側から貫通して挿入した貫通ボルトにて，前記軸受けキャップ体に対して締結して成るバルブタイミング可変装置において，
前記弁ホルダー部材を，前記ヘッドカバーの内部に，当該ヘッドカバーを貫通しないように着脱可能に挿入した差込み部材にて，脱落及び横ずれ不能に取付ける一方，前記シリンダヘッド側に，前記差込み部材に対して，当該差込み部材における差し込み長さ寸法より狭い間隔を隔てて対峙する抜け阻止部を設ける一方，
前記カム軸が，吸気弁用カム軸と排気弁用カム軸から成り，前記軸受けキャップ体が，吸気弁用カム軸に対する軸受けキャップ体と排気弁用カム軸に対する軸受けキャップ体から成り，前記弁ホルダー部材が，吸気弁用カム軸に対する弁ホルダー部材と排気弁用カム軸に対する弁ホルダー部材とを一体にした構成であり，更に，前記差込み部材が，前記吸気弁用弁ホルダー部材と排気弁用弁ホルダー部材の両者を同時に脱落及び横ずれ不能に取付ける構成であり，
更に，前記吸気弁用カム軸に対する軸受けキャップ体と排気弁用カム軸に対する軸受けキャップ体とは，前記両カム軸におけるスプロケットに巻掛けしたタイミングチエンに隣接する部位に位置し，その間の部分には，前記タイミングチエンのうち両スプロケット間の部分に対するチエンガイド用の支持ブラケットが取付けられており，前記抜け阻止部が，前記チエンガイド用支持ブラケットであることを特徴とする内燃機関におけるバルブタイミング可変装置。 On the upper surface of the bearing cap body that supports the cam shaft on the upper surface of the cylinder head, an oil passage to the hydraulic supply source on the cylinder head side and the hydraulic variable mechanism provided on the cam shaft is opened, while the cylinder head Inside the head cover covering the upper surface, a hydraulic control valve for the hydraulic variable mechanism and a valve holder member having an oil passage to the hydraulic control valve are arranged so that the lower surface thereof is in close contact with the upper surface of the bearing cap body. In this close contact surface, each oil passage of the valve holder member communicates with each oil passage of the bearing cap body, and further, the head cover and the valve holder member are connected from the upper surface side of the head cover. A bar that is fastened to the bearing cap body with a through-bolt inserted through. In Bed timing varying device,
The valve holder member is attached to the inside of the head cover so as not to fall off and to be laterally displaced by an insertion member that is detachably inserted so as not to penetrate the head cover, while on the cylinder head side with respect to the insertion member, While providing a slip-off prevention portion that faces the insertion member at a distance narrower than the insertion length dimension ,
The cam shaft comprises an intake valve cam shaft and an exhaust valve cam shaft, and the bearing cap body comprises a bearing cap body for the intake valve cam shaft and a bearing cap body for the exhaust valve cam shaft, and the valve holder The member has a structure in which a valve holder member for the intake valve cam shaft and a valve holder member for the exhaust valve cam shaft are integrated, and the insertion member includes the intake valve valve holder and the exhaust valve valve. It is configured to attach both of the holder members at the same time so that they cannot be detached and laterally displaced.
Furthermore, the bearing cap body for the camshaft for the intake valve and the bearing cap body for the camshaft for the exhaust valve are located at portions adjacent to the timing chain wound on the sprockets on both camshafts. A valve timing varying device in an internal combustion engine , wherein a support bracket for a chain guide is attached to a portion between the sprockets of the timing chain, and the disengagement prevention portion is the support bracket for the chain guide. .
JP2008003959A 2008-01-11 2008-01-11 Valve timing variable device in internal combustion engine Expired - Fee Related JP5145055B2 (en)

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JPH0572626U (en) * 1992-03-06 1993-10-05 ジャトコ株式会社 Transmission parking mechanism
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JPH0932573A (en) * 1995-07-14 1997-02-04 Nissan Motor Co Ltd Chain guide structure
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