WO2011046110A1 - カバー部材の締結方法及びヘッドカバーの締結構造 - Google Patents
カバー部材の締結方法及びヘッドカバーの締結構造 Download PDFInfo
- Publication number
- WO2011046110A1 WO2011046110A1 PCT/JP2010/067862 JP2010067862W WO2011046110A1 WO 2011046110 A1 WO2011046110 A1 WO 2011046110A1 JP 2010067862 W JP2010067862 W JP 2010067862W WO 2011046110 A1 WO2011046110 A1 WO 2011046110A1
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- WIPO (PCT)
- Prior art keywords
- fastening
- head cover
- head
- cover
- area
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F7/00—Casings, e.g. crankcases or frames
- F02F7/006—Camshaft or pushrod housings
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- 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
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
- F01L1/053—Camshafts overhead type
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- 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
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
- F01L2001/0476—Camshaft bearings
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- 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
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
- F01L1/053—Camshafts overhead type
- F01L2001/0537—Double overhead camshafts [DOHC]
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- 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
- F01L2303/00—Manufacturing of components used in valve arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49229—Prime mover or fluid pump making
- Y10T29/49231—I.C. [internal combustion] engine making
Definitions
- the present invention relates to a method for fastening a cover member and a fastening structure for a head cover of an internal combustion engine.
- a seal structure of a head cover of an internal combustion engine a seal structure using a liquid packing and a seal structure using a rubber packing are known. From the viewpoint of preventing noise caused by transmission of vibration from the cylinder head to the head cover, a structure in which the head cover is float-held using a rubber packing having a noise prevention effect superior to that of the liquid packing is preferable. However, when the head cover and the upper surface of the cylinder head have a contact portion that needs to be firmly contacted and fixed, the float structure using the rubber packing is not suitable.
- the seal structure with liquid packing is suitable for fixing the contact part, but in addition to being inferior to rubber packing in terms of vibration and noise prevention effects, it needs to be detached and re-applied during maintenance, such as a head cover.
- a head cover since it is difficult to maintain a uniform seal surface, it is difficult to strictly manage the clearance between the contact portions. Therefore, for example, in Patent Document 1, a lower end edge portion of the rocker cover corresponding to the head cover mounting flange portion of the present application is sealed between the abutting portion where the cylinder head and the rocker cover abut, and the cylinder head and the rocker cover.
- An elastic member is interposed in the wall between the intake manifold and the valve arm chamber formed inside the head cover, and the wall is formed to eliminate the instability of the seal.
- a structure in which the bottom surface is formed in a concave shape and two seal lines are provided is disclosed. According to this, the degree of compression of the seal member can be easily set by the contact portion, the contact portion between the cylinder head and the head cover can be reduced, and soundproofing can be improved. It is possible to seal between the manifold and the valve arm chamber.
- the part cannot be sufficiently abutted and fixed. For this reason, in the abutting portion that needs to be firmly abutted and fixed, it is necessary to have a configuration capable of reducing noise while being firmly fastened by a fastening member without using a seal member.
- Patent Document 2 discloses a cylinder head cover in which a resin coating is provided on a lower surface of a bolt and a bolt tightening boss that are compressed between a cover side peripheral wall and a head side peripheral wall to reduce noise generation.
- the structure which changes the protrusion amount from the lower surface of a cover side surrounding wall according to the magnitude
- the present invention has been made in view of these points, and a fastening method of a cover member and fastening of a head cover that realizes fastening of a contact portion with a sufficient fastening force while suppressing vibration transmission to the head cover. It is an object to provide a structure.
- the present invention is fastened to the engine body by a fastening member inserted through a fastening boss portion formed by being connected to a peripheral edge portion, and is pressed and fixed to the engine body with a predetermined pressure by a fastening force of the fastening member inside the cover.
- a fastening method of a cover member having a contact portion wherein the fastening axial force of the fastening member necessary for fixing the contact portion is calculated, and from the relationship between the stress against the fastening axial force and the abutting area,
- the cover member fastening method is characterized in that an abutting area corresponding to an allowable stress of a material of the cover member is calculated, and an area of the fastening boss portion is set with the calculated abutting area as a minimum area.
- the fastening axial force necessary for fastening the abutting portion that requires strong contact and fixing is obtained, and the abutting corresponding to the required fastening axial force is obtained from the relationship between the stress of the cover member and the abutting area.
- the present invention covers the cylinder head through the head cover side mounting flange portion formed on the peripheral edge portion, and is fastened to the cylinder head by a fastening member that is inserted through the head cover side fastening boss portion, and is integrally formed inside the head cover.
- a minimum abutting area Amin obtained by dividing the fastening axial force N necessary for fastening the upper cam bearing portion by the allowable stress ⁇ a determined by the material of the head cover.
- the head cover fastening structure is characterized in that it has a minimum area of a head cover side fastening boss portion to which the fastening member is fastened.
- the head cover fastening member has a fastening force necessary to firmly fasten the upper cam bearing portion integrated with the head cover to the lower cam bearing portion, the head cover is not deformed and is smaller. Since the fastening boss portion with the abutting area can be configured, it is possible to provide a highly reliable head cover while reducing the vibration transmission by making the abutting area between the head cover and the head appropriate.
- a predetermined gap is formed between the lower surface of the head cover side mounting flange portion and the upper surface of the cylinder head, and the head cover side mounting flange portion is formed with a concave groove that opens to the cylinder head side. It is preferable that the cylinder head and the head cover are sealed by a sealing member inserted into the concave groove.
- the coupling at the head cover side mounting flange surface which may have a relatively small fastening force, is a fastening structure through an elastic seal member such as a rubber packing, thereby suppressing vibration transmission to the head cover and reducing noise.
- Transmission of vibrations from the abutting part by setting the fastening boss part area of the fastening member having a fastening axial force that can satisfy the fastening at the cam bearing part that requires firm fastening while reducing the minimum abutting area. Can be minimized, and noise can be further suppressed.
- the upper cam bearing portion and the head cover side mounting flange portion are connected, a head cover side fastening boss portion is provided between the upper cam bearing portion and the head cover side mounting flange portion, and the head cover side fastening boss is provided.
- the head cover side fastening boss part has a minimum abutting area or an area approximate thereto by a non-contact part formed between the part and the head cover side mounting flange part.
- the fastening boss part is provided close to the wall structure that connects the head cover side mounting flange surface and the cam bearing part, so that the fastening axial force required for fastening the cam bearing can be reduced. Since the fastening bolt boss part is located inside the head cover mounting flange part, the head cover itself can be made compact. In addition, it is easy to adjust the head cover side fastening boss portion to the minimum abutting area by the non-contact portion.
- achieved fastening the contact part by sufficient fastening force, suppressing the vibration transmission to a head cover can be provided.
- the abutting portion that must be firmly abutted and fixed to the upper surface of the cylinder head formed inside the head cover is the same as or approximate to the minimum abutting area while maintaining a sufficient required fastening force.
- the direction may be described as the longitudinal direction of the cam shafts 3 and 4 shown in FIG. 1 and the short direction as the direction orthogonal to the axis. Moreover, the axial direction (direction orthogonal to the paper surface) of the combustion chamber 1a shown in FIG.
- the cylinder head 1 is a part of an in-line three-cylinder engine and holds the intake side camshaft 3 and the exhaust side camshaft 4 rotatably.
- An outer peripheral wall 11 is provided around the cylinder head 1 in a square frame shape, and a cylinder head side mounting surface 11a for mounting a head cover 2 (see FIG. 2) to be described later is formed on the upper end surface of the outer peripheral wall 11.
- a cam chain chamber 12 for accommodating a timing chain (not shown) and cam sprockets 31 and 41 is formed on one end side of the cylinder head 1.
- the cylinder head 1 has an injector installation section 14 for installing an injector 5 (see FIG. 2) for injecting fuel into the combustion chamber 1a between the intake side camshaft 3 and the exhaust side camshaft 4.
- injector installation section 14 for installing an injector 5 (see FIG. 2) for injecting fuel into the combustion chamber 1a between the intake side camshaft 3 and the exhaust side camshaft 4.
- three injector installation portions 14 are formed corresponding to the three combustion chambers 1a.
- the injector installation part 14 is formed in a cylindrical shape and has an installation hole 14a in the center. Adjacent injector installation portions 14 are connected to each other via reinforcing ribs R.
- Wall-like lower camshaft holders holding the intake side camshaft 3 and the exhaust side camshaft 4 on both sides of the injector installation portions 14 are provided. Both end portions of the three lower camshaft holders 15 are connected to the outer peripheral wall 11 and the injector installation portion 14, respectively.
- the lower camshaft holders 13 and 15 have journal portions 13a and 15a (see FIG. 2), which are semicircular concave portions that rotatably support the intake side camshaft 3 or the exhaust side camshaft 4.
- the lower camshaft holders 13 and 15 have fastening holes 16a and 16a that are screwed with fastening members 7 such as bolts for fastening the head cover 2 to the cylinder head 1 on both sides of the journal portions 13a and 15a. is doing. That is, of the upper surfaces of the lower camshaft holders 13 and 15, the portion around the fastening hole 16 a constitutes the cylinder head side fastening boss portion 16.
- the cylinder head side mounting surface 11a which is the upper surface of the outer peripheral wall 11, the upper surfaces of the lower camshaft holders 13 and 15, the upper surface of the injector installation portion 14, and the upper surface of the reinforcing rib R are formed flush with each other. Yes. Further, two intake ports 17 and 17 that open to the combustion chamber 1a and two exhaust ports 18 and 18 are provided around each injector installation portion 14, respectively.
- the intake side camshaft 3 has intake cams 3a at positions corresponding to the intake ports 17, and the exhaust side camshaft 4 has exhaust cams 4a at positions corresponding to the exhaust ports 18. Yes.
- the cylinder head 1 has an oil passage 19 for supplying oil to the journal portion 15a of the lower camshaft holder 15. Further, the cylinder head 1 is provided with a glow plug P obliquely.
- FIG. 3 is a perspective view showing a state in which the head cover is looked up from below.
- the head cover 2 is a member that covers the upper portion of the cylinder head 1 and is formed in a substantially rectangular shape in plan view.
- One end side 2a of the head cover 2 is widened, and covers the upper part of the cam chain chamber 12 (see FIG. 1) that houses a timing chain and the like.
- the head cover 2 has a wall-shaped upper camshaft holder 21 that holds one end side of the intake side camshaft 3 and the exhaust side camshaft 4 adjacent to the cam chain chamber 12.
- the upper camshaft holder 21 extends in a direction orthogonal to the axial direction of the camshafts 3 and 4 (see FIG. 1) and is formed integrally with the head cover 2.
- a wall-shaped head cover side mounting flange portion 22 extending downward is continuously formed on the peripheral edge portion of the head cover 2 other than the one end side 2a.
- a concave groove 22a (see FIG. 2) is formed on the lower surface of the head cover side mounting flange portion 22 continuously in the longitudinal direction.
- a seal member 6 made of an elastic member is installed in the concave groove 22a. In FIG. 2, the seal member 6 in the concave groove 22a is omitted.
- Three through holes 24 a communicating with the installation holes 14 a of the injector installation portion 14 of the cylinder head 1 are formed in series at equal intervals in the longitudinal direction at the center of the head cover 2.
- a cylindrical wall portion 24 extending downward is formed around the through hole 24a.
- Adjacent cylindrical wall portions 24 are connected to each other by a reinforcing wall W extending downward from the inner surface of the head cover 2.
- the lower surface of the cylindrical wall portion 24 and the lower surface of the reinforcing wall W are flush with each other, and a concave groove 24b (see FIG. 2) is formed annularly along the outer peripheral edge of both.
- the seal member 6 is fitted in the concave groove 24b. In FIG. 2, the sealing member 6 in the concave groove 24b is omitted.
- a wall-shaped upper cam shaft holder that holds the intake side cam shaft 3 and the exhaust side cam shaft 4 respectively. 25, 25, 25... are provided. Both end portions of the upper camshaft holder 25 are connected to the head cover side mounting flange portion 22 and the cylindrical wall portion 24, respectively.
- the upper camshaft holders 21 and 25 have journal portions 21a and 25a (see FIG. 2) that are semicircular recesses that rotatably support the intake-side camshaft 3 or the exhaust-side camshaft 4.
- the upper camshaft holder 25 will be described in more detail.
- the upper camshaft holder 25 has a connecting portion 25b that connects the journal portion 25a and the head cover side mounting flange portion 22.
- the upper camshaft holder 25 has a connecting portion 25c that connects the journal portion 25a and the cylindrical wall portion 24.
- the lower surfaces of the connecting portions 25 b and 25 c constitute an abutting portion 27 that abuts against the upper surfaces of the lower camshaft holders 13 and 15 provided in the cylinder head 1.
- Insertion holes 26 a and 26 a for inserting fastening members 7 for fastening the head cover 2 to the cylinder head 1 are formed in the connecting portions 25 b and 25 c of the upper camshaft holder 25. Further, insertion holes 26 a and 26 a through which the fastening member 7 is inserted are formed on both sides of the journal portion 21 a of the upper camshaft holder 21 adjacent to the cam chain chamber 12. The insertion hole 26 a is formed at a position corresponding to the fastening hole 16 a of the cylinder head 1. Of the upper camshaft holders 21 and 25, the portion around the insertion hole 26 a functions as the head cover side fastening boss portion 26. In the present embodiment, the lower surface of the head cover side fastening boss portion 26 and the contact portion 27 partially overlap, and both are connected flush.
- a plurality of head cover side fastening boss portions 28 having a substantially cylindrical shape are also formed on the outer peripheral surface of the head cover side mounting flange portion 22 at intervals.
- the head cover side fastening boss portion 28 has an insertion hole 28 a for inserting the fastening member 7.
- the lower surface of the head cover side fastening boss portion 28 protrudes from the lower surface of the head cover side mounting flange portion 22.
- a cylinder head side fastening boss portion corresponding to the head cover side fastening boss portion 28 is formed on the outer peripheral wall 11 of the cylinder head 1 so that both can be fastened.
- a protrusion 29 for positioning the head cover 2 with respect to the cylinder head 1 is formed on the connecting portion 25b of the upper camshaft holder 25.
- the protrusion 29 is fitted in a recess (not shown) formed on the upper surface of the lower camshaft holder 15 of the cylinder head 1.
- the lower surface of the upper camshaft holder 25 protrudes from the lower surface of the head cover side mounting flange portion 22.
- the lower surface of the head cover side mounting flange portion 22 floats from the cylinder head side mounting surface 11 a of the cylinder head 1. It is in the state.
- the seal member 6 is fitted in the concave groove 22a formed on the lower surface of the head cover side mounting flange portion 22.
- the seal member 6 is a so-called rubber packing made of an elastic material such as nitrile rubber.
- the height dimension of the seal member 6 is formed larger than the depth dimension of the concave groove 22a.
- the lower end portion of the seal member 6 protrudes from the concave groove 22a and presses against the cylinder head side mounting surface 11a to seal between the cylinder head side mounting surface 11a and the head cover side mounting flange portion 22.
- the lower surface of the connecting portion 25b of the upper camshaft holder 25 has a minimum abutting area Amin corresponding to the required fastening axial force.
- a notch 25d which is a non-contact portion is formed so as to be as close as possible to the minimum abutting area Amin.
- the minimum abutting area Amin can be easily obtained by dividing the required fastening axial force N (N) of the fastening member 7 by the allowable stress ⁇ a (N / mm 2 ) determined by the material of the head cover 2. Accordingly, the area A of the lower surface of the connecting portion 25b of the upper camshaft holder 25 (that is, the lower surface of the head cover side fastening boss portion 26) is the same as the minimum abutting area Amin (mm 2 ) or an area close to the minimum abutting area Amin. It can be adjusted by the notch 25d as necessary.
- the area approximated to the minimum abutting area Amin referred to in the present application is an area that is larger than the minimum abutting area Amin but is as close to the minimum abutting area Amin as possible due to structural limitations of the head cover 2.
- the area A of the lower surface of the head cover side fastening boss portion 26 is preferably not more than twice the minimum abutting area Amin, and more preferably not more than 1.5 times. In this way, transmission of vibration can be suppressed while avoiding restrictions on manufacturing the cylinder head 1 and the head cover 2.
- the required fastening axial force N of the fastening member 7 is that the fastening member 7 is slackened when the cam is driven, and no opening occurs between the lower camshaft holders 13 and 15 and the upper camshaft holders 21 and 25.
- This is the limit axial force, and is obtained in advance for each fastening point by, for example, experiments.
- the allowable stress ⁇ a determined by the material of the head cover 2 is a stress that does not cause plastic deformation in the head cover side fastening boss portion 26 due to the fastening axial force by the fastening member 7, for example, an elastic limit point unique to the material of the head cover 2, Determine based on yield point.
- the lower surface of the connecting portion 25c of the upper camshaft holder 25 and the lower surface of the head cover side fastening boss portion 28 formed on the outer peripheral surface of the head cover side mounting flange portion 22 are also the minimum abutting area Amin (mm). 2 ) It is formed so as to have an area equal to or close to the area.
- the seal member 6 that contacts the cylinder head side mounting surface 11a is installed in the concave groove 22a provided on the lower surface of the head cover side mounting flange portion 22, and the head cover side fastening is performed. Since the lower surface of the boss portion 26 protrudes from the lower surface of the head cover side mounting flange portion 22, the transmission of vibration from the cylinder head 1 via the head cover side fastening boss portion 26 is minimized, and the float by the seal member 6 is used.
- a support structure can be realized.
- the area A of the lower surface of the head cover side fastening boss portion 26 is equal to or close to the minimum abutting area Amin obtained by dividing the required fastening axial force N of the fastening member 7 by the allowable stress ⁇ a determined by the material of the head cover 2. Therefore, even if the fastening member 7 is fastened with the required fastening axial force N, the compressive stress ⁇ of the head cover side fastening boss portion 26 does not exceed the allowable stress ⁇ a. Therefore, the head cover side fastening boss portion 26 is not plastically deformed.
- the area A of the lower surface of the head cover side fastening boss portion 26 (that is, the lower surface of the connecting portions 25b and 25c of the upper camshaft holder 25) connected to the contact portion 27 is flush with the minimum abutting area Amin.
- the contact area 27 can be reliably kept fluid-tight (oil-tight) with a smaller fastening axial force, and the transmission of vibrations can be minimized. Is possible.
- the contact portion 27 is connected flush with the lower surface of the head cover side fastening boss portion 26 (in other words, the head cover side fastening boss portion 26 is the upper side constituting the contact portion 27.
- the lower camshaft holders 13 and 15 and the upper camshaft holders 21 and 25 are rigidly formed (as they are formed in the connecting portions 25 b and 25 c of the camshaft holder 25). By fastening, both can be firmly abutted and fixed, and the roundness of the journal portions 13a, 15a, 21a, 25a can be strictly managed and maintained.
- the lower camshaft holders 13 and 15 are formed integrally with the cylinder head 1, but the present invention is not limited to this, and the lower camshaft holders 13 and 15 You may comprise as a separate component arrange
- a plurality of head cover-side fastening boss portions 28 having a substantially cylindrical shape are also formed on the outer peripheral surface of the head cover-side mounting flange portion 22 at intervals. Further, it is more desirable that the head cover side fastening boss portion 28 is positioned substantially in the middle of the cam bearing portion when viewed in the cam shaft direction. With this configuration, the seal on the outer peripheral portion of the head cover 2 can be ensured with a few fastening means. In addition to this embodiment, only a fastening structure with a head cover fastening bolt boss connected to the upper camshaft holder may be used. With this structure, the head cover can be made compact.
- the fastening structure of the head cover 2 in which the upper camshaft holders 21 and 25 are integrally formed is used.
- the fastening method of the present invention is not limited to this.
- the present invention is applicable to fastening of a cover member having an abutting portion that requires firm abutting and fixing inside.
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Abstract
Description
しかし、ヘッドカバーとシリンダヘッドの上面との間でより強固に当接固定する必要のある当接部を有しているような場合では、ゴムパッキンによるフロート構造は不向きである。一方液体パッキンによるシール構造は当接部の固定には適しているものの、振動騒音防止効果においてゴムパッキンに劣ることに加えて、ヘッドカバーのようにメンテナンス時に着脱しシールの剥離と再塗布を要するような部材においてはシール面を均一に維持することが難しいため、当接部の隙間を厳密に管理することが困難であった。
そこで、例えば、特許文献1には、本願のヘッドカバー取付フランジ部に該当するロッカーカバー下端部縁部をシリンダヘッドとロッカーカバーとが当接する当接部と、シリンダヘッドとロッカーカバーとの間にシール部材を挟む密封部とから形成し、さらにヘッドカバー内部に形成された吸気マニホールドと弁腕室間の壁部には弾性部材が介装されており、シールの不安定さを解消するために壁部底面を凹部形状にしてシールラインを2本にする構造が開示されている。これによれば、当接部によってシール部材の圧縮度合いを容易に設定でき、かつ、シリンダヘッドとヘッドカバーとの当接部位を減少して防音性を向上させることができる上に、ヘッドカバー内部の吸気マニホールドと弁腕室間とをシールすることができる。
例えば、カム軸を保持するカム軸ホルダが一体に形成されたヘッドカバーでは、カムジャーナル部にゴムパッキンを用いると、カムジャーナル部の真円度を管理することができず、カム軸の偏磨耗やジャーナル部との接触による騒音といった問題が生じる。また、カムジャーナル部に液体パッキンを用いたとしても、液体パッキンの厚みを均一にすることが困難なため、やはりカムジャーナル部の真円度を厳密に管理することは難しく、本構成ではカムジャーナル部を十分に当接固定することはできない。
そのため、強固な当接固定が必要な当接部においてはシール部材を用いず締結部材により直接強固に締結しつつ騒音を軽減可能な構成が必要である。
特許文献2にはカバー側周壁とヘッド側周壁間で圧縮されるガスケットとボルト締付用ボス下面に樹脂コートを設け騒音の発生を低減したシリンダヘッドカバーにおいて、カバー周壁とボルト締付用ボス部の接続部に生じる組付歪みの大きさに合わせて、カバー側周壁の下面からの突出量を変える構成が開示されている。
特許文献2の構成では、ボルト締付ボス部の面積を大きくすることなくボルト締付ボス部をヘッドカバーにより強く押圧させて締付固定できるものの、ヘッドカバー下面とヘッド上面との間に突き当て量分の間隙が必要であり、ヘッドカバーの締結だけでなく当接部の当接固定を要するヘッドカバーにおいては本構成を採用することはできない。そのためヘッドカバーへの影響を抑制しながら必要な締結力をかけるためには締結ボス部を大径化したり、ヘッドカバーを肉厚化するといった対応しかできなかった。
また、この手法をとることで、設計の初期から当接部ごとに必要な締結ボス部の面積を確保した設計を行うことができ、信頼性を向上させることができる。
また、本発明によれば、ヘッドカバー内部に形成されたシリンダヘッド上面等と強固に当接固定しなければならない当接部においては十分な必要締結力を維持しつつ最小突き当て面積と同じあるいは近似した突き当て面積を有する締結ボス部を設定することで接触面積を低減してヘッドカバーへの振動伝達を軽減し、さらにヘッドカバー周縁のヘッドカバー取付フランジ部においては弾性部材を介在させることでさらに一層ヘッドカバーへの振動伝達を抑制できるようにしたヘッドカバーの締結構造を提供することができる。
隣り合うインジェクタ設置部14同士は、補強リブRを介して互いに連結されている。
各インジェクタ設置部14の両側(より詳しくはカム軸3,4に直交する方向の両側)には、吸気側カム軸3と排気側カム軸4とをそれぞれ保持する壁状の下側カム軸ホルダ15,15,15が設けられている。3つの下側カム軸ホルダ15の両端部は、外周壁11とインジェクタ設置部14とにそれぞれ連結している。
また、各インジェクタ設置部14の周囲には、燃焼室1aに開口する2つの吸気ポート17,17と、2つの排気ポート18,18がそれぞれ設けられている。
また、吸気側カム軸3は、各吸気ポート17に対応する位置に吸気カム3aを有しており、排気側カム軸4は、各排気ポート18に対応する位置に排気カム4aを有している。
図3に示すように、ヘッドカバー2は、シリンダヘッド1の上部を覆う部材であり、平面視で略長方形状に形成されている。ヘッドカバー2の一端側2aは拡幅されており、タイミングチェーン等を収容するカムチェーン室12(図1参照)の上部を覆っている。
ヘッドカバー2は、カムチェーン室12に隣接して、吸気側カム軸3と排気側カム軸4の一端側を保持する壁状の上側カム軸ホルダ21を有している。上側カム軸ホルダ21は、カム軸3,4(図1参照)の軸方向と直交する方向に延設されており、ヘッドカバー2と一体に形成されている。
隣り合う円筒状の壁部24同士は、ヘッドカバー2の内面から下方に延出する補強壁Wによって互いに連結されている。円筒状の壁部24の下面と補強壁Wの下面は、互いに面一になっており、両者の外周縁に沿って凹溝24b(図2参照)が環状に形成されている。凹溝24bにはシール部材6が嵌め入れられている。なお、図2では、凹溝24b内のシール部材6を省略して描いている。
なお、上側カム軸ホルダ25についてさらに詳しく説明すると、上側カム軸ホルダ25は、ジャーナル部25aとヘッドカバー側取付フランジ部22とを連結する連結部25bを有している。また、上側カム軸ホルダ25は、ジャーナル部25aと円筒状の壁部24とを連結する連結部25cを有している。
この連結部25b、25cの下面は、シリンダヘッド1に設けられた下側カム軸ホルダ13,15の上面に当接する当接部27を構成している。
上側カム軸ホルダ21,25のうち、挿通孔26aの周囲の部分が、ヘッドカバー側締結ボス部26として機能する。本実施形態では、ヘッドカバー側締結ボス部26の下面と当接部27とが一部重複しており、両者は面一に連結している。
ちなみに、図示は省略するが、シリンダヘッド1の外周壁11に、ヘッドカバー側締結ボス部28に対応するシリンダヘッド側締結ボス部が形成されており、両者を締結できるようになっている。
シール部材6は、例えばニトリルゴムなどの弾性材料からなるいわゆるゴムパッキンである。シール部材6の高さ寸法は、凹溝22aの深さ寸法よりも大きく形成されている。シール部材6の下端部は、凹溝22aからはみ出してシリンダヘッド側取付面11aに圧接して、シリンダヘッド側取付面11aとヘッドカバー側取付フランジ部22との間を密封している。
円筒状の壁部24の下面と補強壁Wの下面に形成された凹溝24bに設置されたシール部材6についても同様である(図2、図3参照)。
このようにすれば、シリンダヘッド1やヘッドカバー2の作製上の制約を回避しながら、振動の伝達を抑制することができる。
また、ヘッドカバー2の材質により定まる許容応力σaとは、締結部材7による締結軸力によってヘッドカバー側締結ボス部26に塑性変形が生じない応力であり、例えばヘッドカバー2の材質に固有の弾性限界点や降伏点に基づいて決定する。
本実施形態に係るヘッドカバー2の締結構造によれば、ヘッドカバー側取付フランジ部22の下面に設けられた凹溝22aに、シリンダヘッド側取付面11aに当接するシール部材6が設置され、ヘッドカバー側締結ボス部26の下面は、ヘッドカバー側取付フランジ部22の下面よりも突出しているので、ヘッドカバー側締結ボス部26を介したシリンダヘッド1からの振動の伝達を最小限にして、シール部材6によるフロート支持構造を実現することができる。
また、本実施形態では、上側カム軸ホルダ21,25が一体に形成されたヘッドカバー2の締結構造としたが、本発明の締結方法はこれに限定されるものではない。強固な当接固定を要する当接部を内部に有するカバー部材の締結において本発明は適用可能である。
1a 燃焼室
11 外周壁
11a シリンダヘッド側取付面
13,15 下側カム軸ホルダ
16 シリンダヘッド側締結ボス部
16a 締結孔
2 ヘッドカバー
21,25 上側カム軸ホルダ
22 ヘッドカバー側取付フランジ部
22a 凹溝
25b,25c 連結部
26 ヘッドカバー側締結ボス部
26a 挿通孔
27 当接部
3 吸気側カム軸
4 排気側カム軸
5 インジェクタ
6 シール部材
7 締結部材
Claims (4)
- 周縁部に連結して形成された締結ボス部に挿通される締結部材により機関本体に締結され、カバー内部に前記締結部材の締結力により所定の圧力で前記機関本体に押し付け固定される当接部を有したカバー部材の締結方法であって、
前記当接部の固定に必要な前記締結部材の締結軸力を算出し、
前記締結軸力に対する応力と突き当て面積の関係から、前記カバー部材の材料の持つ許容応力に相当する突き当て面積を算出し、
算出された突き当て面積を最小面積として前記締結ボス部の面積を設定することを特徴とするカバー部材の締結方法。 - 周縁部に形成されたヘッドカバー側取付フランジ部を介してシリンダヘッドを覆い、ヘッドカバー側締結ボス部を挿通する締結部材により前記シリンダヘッドに締結され、ヘッドカバー内部に一体に形成された上側カム軸受部を有するヘッドカバーの締結構造であって、
前記上側カム軸受部の締結に必要な締結軸力をヘッドカバーの材料により定まる許容応力で除算して求められる最小突き当て面積を、前記締結部材が締結されるヘッドカバー側締結ボス部の最小面積とすることを特徴とするヘッドカバーの締結構造。 - 前記ヘッドカバー側取付フランジ部の下面とシリンダヘッド上面間は所定間隙を有しており、
前記ヘッドカバー側取付フランジ部にはシリンダヘッド側に開口する凹溝が形成されており、
前記凹溝内に挿入されたシール部材によってシリンダヘッドとヘッドカバー間がシールされていることを特徴とする請求の範囲第2項に記載のヘッドカバーの締結構造。 - 前記上側カム軸受部と前記ヘッドカバー側取付フランジ部を連結し、
前記上側カム軸受部と前記ヘッドカバー側取付フランジ部間にヘッドカバー側締結ボス部を設け、
前記ヘッドカバー側締結ボス部と前記ヘッドカバー側取付フランジ部間に形成した非接触部により前記ヘッドカバー側締結ボス部を最小突き当て面積あるいはそれに近似する面積とすることを特徴とする請求の範囲第2項又は第3項に記載のヘッドカバーの締結構造。
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US13/501,704 US20120199096A1 (en) | 2009-10-13 | 2010-10-12 | Cover member fastening method and fastening structure for a head cover |
EP10823378.4A EP2489865A4 (en) | 2009-10-13 | 2010-10-12 | FASTENING METHOD FOR COVER MEMBER AND FIXING STRUCTURE FOR HOUSING COVERS |
CN2010800462937A CN102549253A (zh) | 2009-10-13 | 2010-10-12 | 罩部件的紧固方法以及气缸盖罩的紧固结构 |
JP2011536138A JPWO2011046110A1 (ja) | 2009-10-13 | 2010-10-12 | カバー部材の締結方法及びヘッドカバーの締結構造 |
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JP2019148245A (ja) * | 2018-02-28 | 2019-09-05 | トヨタ自動車株式会社 | オイルクーラ |
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US9382870B2 (en) | 2013-10-08 | 2016-07-05 | Ford Global Technologies, Llc | Compression boss for engine front cover |
CN103949926B (zh) * | 2014-05-07 | 2017-02-01 | 广西玉柴机器股份有限公司 | 凸轮轴孔的加工定位方法 |
FR3026789B1 (fr) * | 2014-10-02 | 2016-11-04 | Renault Sa | Couvre-culasse de moteur a combustion interne |
KR101745262B1 (ko) * | 2016-04-21 | 2017-06-09 | 현대자동차주식회사 | 차량용 캠캐리어 모듈 |
EP3793504B1 (en) * | 2018-05-17 | 2024-03-13 | Becton Dickinson France | Connector for connecting a medical injection device to a container |
FR3086975B1 (fr) | 2018-10-09 | 2021-01-22 | Renault Sas | Couvre-culasse de moteur a paliers semi integres et compacts |
JP7343345B2 (ja) * | 2019-09-27 | 2023-09-12 | ダイハツ工業株式会社 | 多気筒内燃機関のヘッドカバー |
DE102021201823A1 (de) * | 2021-02-26 | 2022-09-01 | Mahle International Gmbh | Zylinderkopfhaube |
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EP2489865A1 (en) | 2012-08-22 |
CN102549253A (zh) | 2012-07-04 |
US20120199096A1 (en) | 2012-08-09 |
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