JPH08151932A - Waterproof structure of timing belt in internal combustion engine - Google Patents

Waterproof structure of timing belt in internal combustion engine

Info

Publication number
JPH08151932A
JPH08151932A JP29418394A JP29418394A JPH08151932A JP H08151932 A JPH08151932 A JP H08151932A JP 29418394 A JP29418394 A JP 29418394A JP 29418394 A JP29418394 A JP 29418394A JP H08151932 A JPH08151932 A JP H08151932A
Authority
JP
Japan
Prior art keywords
timing belt
cover
mounting groove
belt
taper surface
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP29418394A
Other languages
Japanese (ja)
Other versions
JP3075105B2 (en
Inventor
Akihiko Moroishi
昭彦 諸石
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Priority to JP06294183A priority Critical patent/JP3075105B2/en
Publication of JPH08151932A publication Critical patent/JPH08151932A/en
Application granted granted Critical
Publication of JP3075105B2 publication Critical patent/JP3075105B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B67/00—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for
    • F02B67/04—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus
    • F02B67/06—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus driven by means of chains, belts, or like endless members

Landscapes

  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

PURPOSE: To prevent the ingress of water to the inside of a cylindrical part in a timing belt cover side by setting a clearance between the start end of the conic taper surface of a belt mounting groove and the tip end of the flange of the cylindrical part in the timing belt cover side to an absolute minimum so that both can not interfere with each other. CONSTITUTION: An axial direction position of the tip end of the flange part 42B of a cylindrical member 42 installed on a timing belt cover 28 is nearly matched with the start end position of the conic taper surface 38 of the belt mounting groove 31C on a crank pulley 31. At this time, a ring shape clearance C1 is provided between the tip end of the flange part 42B and the start end of the conic taper surface 38 and even if the axial direction position of the cover 28 is changed by the tolerance of the installation position of the cover 28, the interference between both is prevented by such state that the clearance amount between the tip end of the flange part 42B and the belt mounting groove 31C of the crank pulley 31 is not changed. The water ingress of the cover 28 from the penetration hole 30 of the crankshaft 20 is thereby prevented surely.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、内燃機関におけるタイ
ミングベルトの防水構造に関し、特に、構造の簡略化を
図りつつ、防水能力の向上を図る技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof structure for a timing belt in an internal combustion engine, and more particularly to a technique for improving the waterproof performance while simplifying the structure.

【０００２】[0002]

【従来の技術】内燃機関におけるクランクシャフト端部
の構造は、従来、例えば、図４に示すようになっている
（実開昭６２−９０９４６号公報等参照）。即ち、シリ
ンダブロック１の壁部を貫通したクランクシャフト２の
端部には、タイミングプーリ３が装着され、このタイミ
ングプーリ３には、タイミングベルト４が巻き掛けられ
ている。2. Description of the Related Art Conventionally, a structure of a crankshaft end portion of an internal combustion engine is as shown in, for example, FIG. That is, the timing pulley 3 is attached to the end of the crankshaft 2 which penetrates the wall of the cylinder block 1, and the timing belt 4 is wound around the timing pulley 3.

【０００３】前記タイミングベルト４はシリンダブロッ
ク４のクランクシャフト２貫通部側の壁面と、該壁面に
固定されたタイミングベルトカバー５とで囲まれたタイ
ミングベルト室６に配設されている。クランクシャフト
２先端部は、前記タイミングベルトカバー５に形成され
た貫通孔７から該カバー５外に突出され、この突出端部
には、ハブ８が固定取付され、このハブ８には、クラン
クプーリ９が取り付けられている。The timing belt 4 is arranged in a timing belt chamber 6 surrounded by a wall surface of the cylinder block 4 on the side where the crankshaft 2 penetrates and a timing belt cover 5 fixed to the wall surface. The tip of the crankshaft 2 is projected from the through hole 7 formed in the timing belt cover 5 to the outside of the cover 5. A hub 8 is fixedly attached to the protruding end, and a crank pulley is attached to the hub 8. 9 is attached.

【０００４】クランクプーリ９は、クランクシャフト２
の回転力により、エアコン用コンプレッサを駆動するた
めのベルトが巻き掛けられるベルト装着溝部１０と、オ
ルタネータを駆動するためのベルトが巻き掛けられるベ
ルト装着溝部１１と、が一体形成されるベルト装着溝部
構成体１２と、パワステ用コンプレッサを駆動するため
のベルトが巻き掛けられるベルト装着溝部１３が形成さ
れるベルト装着溝部構成体１４とから構成される。The crank pulley 9 is the crankshaft 2
A belt mounting groove portion configuration in which a belt mounting groove portion 10 around which a belt for driving an air conditioner compressor is wound and a belt mounting groove portion 11 around which a belt for driving an alternator is wound are integrally formed by the rotational force of The body 12 and a belt mounting groove portion structure 14 in which a belt mounting groove portion 13 around which a belt for driving the power steering compressor is wound are formed.

【０００５】ところで、車両の雨中走行時においては、
エンジンルーム内は水のはね上げ等により水しぶきが発
生している。上記のように、クランクシャフト２がタイ
ミングベルトカバー５の貫通孔７から外部へと貫通し、
この貫通孔７のシールが不可能な構成においては、前記
水しぶきがクランクプーリ９に降りかかって、貫通孔７
を介してタイミングベルト室６に侵入するのを何らかの
構造で防止して、タイミングベルト４の防水を図る必要
がある。By the way, when the vehicle is running in the rain,
Splashes of water have been generated in the engine room due to splashing of water. As described above, the crankshaft 2 penetrates through the through hole 7 of the timing belt cover 5 to the outside,
In the structure in which the through hole 7 cannot be sealed, the water splashes on the crank pulley 9 and the through hole 7
It is necessary to prevent the timing belt 4 from waterproofing by preventing it from entering the timing belt chamber 6 through some structure.

【０００６】この防水構造として、従来、前記実開昭６
２−９０９４６号公報に開示された技術では、タイミン
グベルトカバー５とクランクプーリ９との隙間を極力小
さくしてクランクプーリ９内側への水の侵入を防止する
べく、タイミングベルトカバー５にクランクプーリ９側
に膨出する膨出部１５を形成している。又、タイミング
ベルトカバー５の貫通孔７からタイミングベルト室６内
への水の侵入を防止するべく、タイミングベルトカバー
５の貫通孔７に筒部１６を設けて、この筒部１６の前端
部を外周側に湾曲形成すると共に、筒部１６内周面とク
リアランスを介して位置する水切筒１７をクランクシャ
フト２端部に固定取付し、この水切筒１７の前端部を筒
部１６前端部の湾曲形状に沿わせて湾曲形成するように
している。Conventionally, as this waterproof structure, the above-mentioned actual construction 6
In the technique disclosed in JP-A-2-90946, the timing belt cover 5 is provided with a crank pulley 9 in order to minimize the gap between the timing belt cover 5 and the crank pulley 9 to prevent water from entering the inside of the crank pulley 9. The bulging part 15 which bulges to the side is formed. Further, in order to prevent water from entering through the through hole 7 of the timing belt cover 5 into the timing belt chamber 6, a tubular portion 16 is provided in the through hole 7 of the timing belt cover 5, and a front end portion of the tubular portion 16 is provided. A draining cylinder 17 that is curved and formed on the outer peripheral side and is positioned with a clearance from the inner peripheral surface of the tubular portion 16 is fixedly attached to the end of the crankshaft 2, and the front end of the draining cylinder 17 is curved at the front end of the tubular portion 16. The shape is curved according to the shape.

【０００７】更に、前記ハブ８に形成された外筒部８Ａ
内周面を円錐状テーパ面８ａにし、ハブ８がクランクシ
ャフト２と一体に回転する際に、前記円錐状テーパ面８
にて前記筒部１６と水切筒１７とのクリアランスから侵
入しようとする水を飛散させるようにしている。Further, an outer cylinder portion 8A formed on the hub 8
The inner peripheral surface is formed into a conical tapered surface 8a, and when the hub 8 rotates integrally with the crankshaft 2, the conical tapered surface 8 is formed.
In this way, the water that tries to enter from the clearance between the cylindrical portion 16 and the draining cylinder 17 is scattered.

【０００８】[0008]

【発明が解決しようとする課題】しかしながら、このよ
うな防水構造にあっては、次のような問題点があった。
即ち、上述したように、筒部１６の前端部を外周側に湾
曲形成して、ハブ８の外筒部８Ａ内周面の円錐状テーパ
面８ａに近接して対向した構成では、円錐状テーパ面８
ａの傾斜角度θが小さい場合は問題とならないが、水の
飛散効果を増すためにこの傾斜角度θを大きくするよう
にした場合、タイミングベルトカバー５の取付位置の公
差により、該タイミングベルトカバー５の軸方向位置が
変化すると、筒部１６の前端部と円錐状テーパ面８ａと
のクリアランス量が変化し、最悪の場合は、両者が干渉
し合うことになる。However, such a waterproof structure has the following problems.
That is, as described above, in the configuration in which the front end portion of the tubular portion 16 is curvedly formed on the outer peripheral side and closely faces the conical tapered surface 8a of the inner circumferential surface of the outer tubular portion 8A of the hub 8, the conical taper is provided. Surface 8
When the inclination angle θ of a is small, it does not matter, but when the inclination angle θ is increased in order to increase the effect of splashing water, the timing belt cover 5 has a tolerance due to the mounting position of the timing belt cover 5. When the axial position of is changed, the clearance amount between the front end portion of the cylindrical portion 16 and the conical tapered surface 8a is changed, and in the worst case, the two interfere with each other.

【０００９】このため、上記のように、水の飛散効果を
増すためにこの円錐状テーパ面８ａの傾斜角度θを大き
くするようにした場合、筒部１６の前端部と円錐状テー
パ面８ａとのクリアランス量を小さくできず、該クリア
ランス量を公差により縮まる分の余裕を持たせて予め大
きく設定せざるを得ない。このため、貫通孔７からの水
の侵入の防止効果を満足するように得られず、防水効果
が劣る結果となってしまう。Therefore, as described above, when the inclination angle θ of the conical tapered surface 8a is increased in order to increase the water scattering effect, the front end portion of the cylindrical portion 16 and the conical tapered surface 8a are formed. The clearance amount cannot be reduced, and the clearance amount must be set in advance with a margin for shrinking due to the tolerance. For this reason, the effect of preventing the entry of water from the through hole 7 cannot be obtained so that the waterproof effect is inferior.

【００１０】更に、従来の構成では、水切筒１７という
別部品を付加する必要があるから、部品点数が増加し、
構成の複雑化を来して、コスト的に不利である。本発明
は以上のような従来の問題点に鑑み、内燃機関における
タイミングベルトの防水構造において、構成の簡略化を
図ると共に、防水効果を向上することを目的とする。Furthermore, in the conventional structure, since it is necessary to add a separate part called the draining cylinder 17, the number of parts increases,
There is a cost disadvantage because the configuration becomes complicated. In view of the above conventional problems, it is an object of the present invention to simplify the structure and improve the waterproof effect in a waterproof structure for a timing belt in an internal combustion engine.

【００１１】[0011]

【課題を解決するための手段】このため、請求項１記載
の発明は、シリンダブロック壁を貫通して外部に突出さ
れるクランクシャフト端部外周に、タイミングベルトが
巻き掛けられるタイミングプーリを装着し、該タイミン
グベルト配設部を覆うようにシリンダブロック壁に取り
付けられるタイミングベルトカバーを貫通させて外部に
突出させたクランクシャフト先端部にベルトが巻き掛け
られるクランクプーリを装着してなる内燃機関におい
て、前記クランクプーリに、クランクシャフトへの取付
部と、該取付部外周に連接されて略軸直角な面内に延び
る環状の連接部と、該連接部の外周部にタイミングベル
トカバー側に張り出して連接される環状のベルト装着溝
部とを少なくとも設け、前記クランクプーリのベルト装
着溝部のタイミングベルトカバーに面する外側面の内端
側から外端側に向かう所定幅部分を、該内端側から外端
側に向かうに連れてタイミングベルトカバーに徐々に近
寄るように軸に対して所定角度で傾斜する円錐状テーパ
面に形成し、前記タイミングベルトカバーのクランクシ
ャフト貫通部を、筒部と該筒部先端外周端から軸直角な
面内に延びるフランジ部とを有する筒状部から構成し、
前記筒状部のフランジ部先端部の軸方向位置を、円錐状
テーパ面の始端部位置に略合致させ、該フランジ部先端
部と円錐状テーパ面の始端部との間に所定の環状クリア
ランスを設けるようにした。Therefore, according to the first aspect of the present invention, a timing pulley around which a timing belt is wound is mounted on the outer periphery of the crankshaft end portion that penetrates the cylinder block wall and projects to the outside. In an internal combustion engine in which a crank pulley around which a belt is wound is attached to a crankshaft tip end portion which penetrates a timing belt cover attached to a cylinder block wall so as to cover the timing belt arrangement portion and protrudes to the outside, The crank pulley is attached to the crankshaft, an annular connecting portion that is connected to the outer circumference of the attaching portion and extends in a plane substantially perpendicular to the axis, and is connected to the outer peripheral portion of the connecting portion by protruding toward the timing belt cover side. At least the annular belt mounting groove portion is provided, and the timing of the belt mounting groove portion of the crank pulley. At a predetermined angle with respect to the shaft, a predetermined width portion of the outer surface facing the belt cover from the inner end side toward the outer end side gradually approaches the timing belt cover from the inner end side toward the outer end side. Formed in an inclined conical taper surface, the crankshaft penetrating portion of the timing belt cover is composed of a tubular portion having a tubular portion and a flange portion extending in a plane perpendicular to the axis from the outer peripheral end of the distal end of the tubular portion,
The axial position of the flange tip end portion of the tubular portion is substantially matched with the starting end portion position of the conical tapered surface, and a predetermined annular clearance is provided between the flange tip end portion and the conical tapered surface starting end portion. I decided to provide it.

【００１２】請求項２記載の発明は、前記筒状部のフラ
ンジ部先端の両側の２つの角部のうちシリンダブロック
寄りの角部を、前記クランクプーリのベルト装着溝部の
円錐状テーパ面の始端部位置よりもシリンダブロック寄
りにずらして位置させるようにした。請求項３記載の発
明は、前記クランクプーリの連接部とベルト装着溝部と
の境部位置から前記円錐状テーパ面の始端部位置に向か
う部分を、該境部位置から始端部位置に向かうに連れて
タイミングベルトカバーに徐々に近寄るように軸に対し
て前記円錐状テーパ面の傾斜角度よりも小なる所定角度
で傾斜する円錐状テーパ面に形成するようにした。According to a second aspect of the present invention, of the two corner portions on both sides of the tip of the flange portion of the tubular portion, the corner portion closer to the cylinder block is the start end of the conical tapered surface of the belt mounting groove portion of the crank pulley. The cylinder block is located closer to the cylinder block than it is. According to a third aspect of the present invention, a portion from a boundary position between the connecting portion of the crank pulley and the belt mounting groove portion toward a starting end position of the conical tapered surface is moved from the boundary position toward the starting end position. The conical taper surface is formed so as to gradually approach the timing belt cover at a predetermined angle smaller than the inclination angle of the conical taper surface with respect to the axis.

【００１３】請求項４記載の発明は、シリンダブロック
壁のタイミングベルトカバー取付部の最底部に、タイミ
ングベルトカバー内面と前記タイミングベルトカバー取
付部との間とその外部とを連通する水抜き孔を形成し
た。請求項５記載の発明は、前記クランクプーリのベル
ト装着溝部の円錐状テーパ面形成側外側面の裏側の内側
面を、該円錐状テーパ面と平行に形成するようにした。According to a fourth aspect of the present invention, a drainage hole is provided at the bottom of the timing belt cover mounting portion of the cylinder block wall for communicating between the inner surface of the timing belt cover and the timing belt cover mounting portion and the outside thereof. Formed. According to a fifth aspect of the present invention, the inner side surface of the belt mounting groove of the crank pulley on the back side of the outer surface of the conical tapered surface forming side is formed in parallel with the conical tapered surface.

【００１４】[0014]

【作用】請求項１記載の発明において、ベルト装着溝部
の円錐状テーパ面の始端部と、タイミングベルトカバー
側の筒状部のフランジ部先端部とのクリアランスは、両
者が干渉しないために必要な最小限に設定することによ
り、両者間から水がタイミングベルトカバー側の筒状部
内側に侵入するのが極力防止される。In the invention of claim 1, the clearance between the starting end of the conical taper surface of the belt mounting groove and the tip of the flange of the tubular portion on the timing belt cover side is required so that they do not interfere with each other. By setting it to the minimum, it is possible to prevent water from entering the inside of the tubular portion on the side of the timing belt cover as much as possible.

【００１５】又、このクリアランスを介して水が侵入し
ようとすると、水は回転するクランクプーリのベルト装
着溝部の円錐状テーパ面によって飛散され、タイミング
ベルトカバー側の筒状部内側に侵入するのが極力防止さ
れる。ここで、タイミングベルトカバーのクランクシャ
フト貫通部を構成する筒状部のフランジ部先端部の軸方
向位置を、円錐状テーパ面の始端部位置に略合致させた
から、タイミングベルトカバーの軸方向位置が変化して
も、フランジ部先端部とクランクプーリのベルト装着溝
部とのクリアランス量が変化せず、両者が干渉し合うこ
とを防止でき、これにより、水の飛散効果を増すために
円錐状テーパ面の傾斜角度を大きく設定した場合でも、
フランジ部先端部とクランクプーリのベルト装着溝部と
のクリアランス量を予め小さくできる結果、水の飛散効
果を高めることができると同時に、水の侵入の防止効果
が満足するように得られ、防水効果を大幅に高めること
ができる。Further, when water tries to enter through this clearance, the water is scattered by the conical taper surface of the belt mounting groove of the rotating crank pulley and enters the inside of the tubular portion on the timing belt cover side. It is prevented as much as possible. Here, since the axial position of the flange tip end portion of the cylindrical portion forming the crankshaft penetrating portion of the timing belt cover is made to substantially coincide with the starting end position of the conical taper surface, the axial position of the timing belt cover is Even if it changes, the clearance amount between the tip of the flange and the belt mounting groove of the crank pulley does not change, and it is possible to prevent the two from interfering with each other, and thus the conical tapered surface to increase the water splashing effect. Even if the inclination angle of is set to a large value,
The amount of clearance between the tip of the flange and the belt mounting groove of the crank pulley can be made small in advance, so that the effect of splashing water can be enhanced, and at the same time, the effect of preventing water from entering can be obtained and the waterproof effect can be obtained. Can be greatly increased.

【００１６】請求項２記載の発明によれば、タイミング
ベルトカバーの取付位置の公差によるタイミングベルト
カバーの軸方向位置の変化量を十分に許容できるから、
上記の効果はより発揮される。請求項３記載の発明によ
れば、水の侵入を２つの異なる傾斜角度のテーパ面でよ
り効果的に防止することができる。According to the second aspect of the invention, the amount of change in the axial position of the timing belt cover due to the tolerance of the mounting position of the timing belt cover can be sufficiently allowed.
The above effect is more exerted. According to the invention described in claim 3, it is possible to more effectively prevent intrusion of water by the tapered surfaces having two different inclination angles.

【００１７】請求項４記載の発明によれば、タイミング
ベルトカバー内側に水が溜まるのを防止できる。請求項
５記載の発明によれば、ベルト装着溝部のベルトとの摩
擦発熱を緩和することができる。According to the invention described in claim 4, it is possible to prevent water from accumulating inside the timing belt cover. According to the fifth aspect of the present invention, it is possible to reduce frictional heat generation between the belt mounting groove portion and the belt.

【００１８】[0018]

【実施例】以下、添付された図面を参照して本発明を詳
述する。図１において、クランクシャフト２０の端部は
シリンダブロック２１壁に形成されたオイルポンプのア
ッセンブリ２２を貫通して外部に突出され、該突出部分
の基部にはタイミングプーリ２３がキー２４によって固
定取付されている。このタイミングプーリ２３には、タ
イミングベルト２５が巻き掛けられている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. In FIG. 1, an end portion of a crankshaft 20 penetrates an assembly 22 of an oil pump formed on a wall of a cylinder block 21 and is projected to the outside, and a timing pulley 23 is fixedly attached to a base portion of the projected portion by a key 24. ing. A timing belt 25 is wound around the timing pulley 23.

【００１９】前記オイルポンプのアッセンブリ２２が形
成されたシリンダブロック２１の壁部２１Ａには、複数
の取付フランジ部２１ａが一体形成されている。前記シ
リンダブロック２１の壁部２１Ａの底部にはオイルパン
２６の上端取付フランジ部２６Ａが装着される。前記シ
リンダブロック２１の壁部２１Ａと共にタイミングベル
ト室２７を構成するタイミングベルトカバー２８は、シ
リンダブロック２１の壁部２１Ａ端面に沿って配設さ
れ、その周端部は、ボルト２９によりシリンダブロック
２１の壁部２１Ａの取付フランジ部２１ａに締結され
る。A plurality of mounting flange portions 21a are integrally formed on the wall portion 21A of the cylinder block 21 in which the assembly 22 of the oil pump is formed. An upper end mounting flange portion 26A of the oil pan 26 is mounted on the bottom portion of the wall portion 21A of the cylinder block 21. The timing belt cover 28, which constitutes the timing belt chamber 27 together with the wall portion 21A of the cylinder block 21, is arranged along the end surface of the wall portion 21A of the cylinder block 21, and the peripheral end portion of the cylinder belt 21 is fixed by the bolt 29. It is fastened to the mounting flange portion 21a of the wall portion 21A.

【００２０】前記クランクシャフト２０端部は、タイミ
ングベルトカバー２８に設けられた貫通孔３０を貫通し
て外部に突出され、突出されたクランクシャフト２０端
部外周には、クランクプーリ３１が固定取付されてい
る。このクランクプーリ３１は、クランクシャフト２０
に取り付けられる筒状取付部３１Ａと、該取付部３１Ａ
外周に連接されて略軸直角な面内に延びる環状の連接部
３１Ｂと、該連接部３１Ｂの外周部にタイミングベルト
カバー２８側に張り出して連接される環状のベルト装着
溝部３１Ｃと、該ベルト装着溝部３１Ｃのタイミングベ
ルトカバー２８側と反対側の外側面に連接して軸方向に
延びるベルト装着溝部構成体取付部３１Ｄとを具備した
一体成型品からなる。The end portion of the crankshaft 20 penetrates through a through hole 30 formed in the timing belt cover 28 and is projected to the outside. A crank pulley 31 is fixedly attached to the outer circumference of the projected crankshaft 20 end portion. ing. This crank pulley 31 is used for the crankshaft 20.
And a cylindrical mounting portion 31A mounted on the
An annular connecting portion 31B that is connected to the outer periphery and extends in a plane substantially perpendicular to the axis, an annular belt mounting groove portion 31C that is connected to the outer peripheral portion of the connecting portion 31B so as to project toward the timing belt cover 28, and the belt mounting portion. It is an integrally molded product that is provided with a belt mounting groove portion structure attaching portion 31D that is connected to the outer surface of the groove portion 31C on the side opposite to the timing belt cover 28 side and extends in the axial direction.

【００２１】クランクプーリ３１のベルト装着溝部３１
Ｃは、断面略Ｖ字形状に形成されており、クランクシャ
フト２０の回転力により、パワステ用コンプレッサを駆
動するための断面略Ｖ字形のベルト（図示せず）が巻き
掛けられる。クランクプーリ３１の筒状取付部３１Ａ
は、クランクシャフト２０先端部に嵌挿されて、キー３
２により固定取付される。又、クランクシャフト２０先
端外周のねじ部２０Ａには押さえ部材３３が挿通される
と共にナット３４が嵌合され、前記筒状取付部３１Ａを
抜け出さないように押さえ固定するようになっている。Belt mounting groove 31 of the crank pulley 31
C is formed in a substantially V-shaped cross section, and a belt having a substantially V-shaped cross section (not shown) for driving the power steering compressor is wound by the rotational force of the crankshaft 20. Cylinder pulley 31 cylindrical mounting portion 31A
Is inserted into the tip of the crankshaft 20 and the key 3
It is fixedly attached by 2. Further, the pressing member 33 is inserted into the threaded portion 20A on the outer periphery of the front end of the crankshaft 20 and the nut 34 is fitted therein so that the tubular mounting portion 31A is pressed and fixed so as not to come out.

【００２２】前記クランクプーリ３１のベルト装着溝部
構成体取付部３１Ｄ外周面には、ベルト装着溝部３５，
３６が並列して形成された筒状のベルト装着溝部構成体
３７が嵌合取付されている。一方のベルト装着溝部３５
は、断面略Ｖ字形の複数の溝３５Ａが形成されており、
クランクシャフト２０の回転力により、エアコン用コン
プレッサを駆動するための複数の略Ｖ形リブを有する平
ベルト（図示せず）が巻き掛けられる。On the outer peripheral surface of the belt mounting groove portion structure mounting portion 31D of the crank pulley 31, a belt mounting groove portion 35,
A tubular belt mounting groove portion structure 37 formed by arranging 36 in parallel is fitted and attached. One belt mounting groove 35
Has a plurality of grooves 35A having a substantially V-shaped cross section,
Due to the rotational force of the crankshaft 20, a flat belt (not shown) having a plurality of substantially V-shaped ribs for driving the air conditioner compressor is wound.

【００２３】他方のベルト装着溝部３６は、断面略Ｖ字
形の複数の溝３６Ａが形成されており、クランクシャフ
ト２０の回転力により、オルタネータを駆動するための
複数の略Ｖ形リブを有する平ベルト（図示せず）が巻き
掛けられる。かかる構成において、タイミングベルト２
５の防水構造は次のように構成される。The other belt mounting groove 36 is formed with a plurality of grooves 36A having a substantially V-shaped cross section, and has a plurality of substantially V-shaped ribs for driving the alternator by the rotational force of the crankshaft 20. (Not shown) is wrapped around. In such a configuration, the timing belt 2
The waterproof structure of 5 is configured as follows.

【００２４】即ち、前記クランクプーリ３１のベルト装
着溝部３１Ｃのタイミングベルトカバー２８に面する外
側面の内端側から外端側に向かう所定幅部分は、該内端
側から外端側に向かうに連れてタイミングベルトカバー
２８に徐々に近寄るように軸に対して所定角度θ1 で傾
斜する円錐状テーパ面３８に形成されている（図２参
照）。That is, a predetermined width portion of the outer surface of the belt mounting groove portion 31C of the crank pulley 31 facing the timing belt cover 28 from the inner end side to the outer end side extends from the inner end side to the outer end side. A conical taper surface 38 is formed so as to gradually approach the timing belt cover 28 at a predetermined angle θ 1 with respect to the axis (see FIG. 2).

【００２５】又、前記クランクプーリ３１のベルト装着
溝部３１Ｃのタイミングベルトカバー２８に面する外側
面の円錐状テーパ面３８の終端部Ｂから該外側面の先端
に向かう幅部分は、軸直角な面３９に形成されている
（図２参照）。又、前記クランクプーリ３１のベルト装
着溝部３１Ｃと連接部３１Ｂとの境部は、略直角に交わ
る面であって、内角部が円弧状に形成された面４０に形
成されている。尚、円錐状テーパ面３８の始端部はエッ
ジ部とされる（図２参照）。The width portion of the outer peripheral surface of the conical taper surface 38 facing the timing belt cover 28 of the belt mounting groove portion 31C of the crank pulley 31 from the terminal end B to the tip of the outer surface is a plane perpendicular to the axis. 39 (see FIG. 2). Further, a boundary portion between the belt mounting groove portion 31C and the connecting portion 31B of the crank pulley 31 is a surface intersecting at a substantially right angle, and an inner corner portion is formed on a surface 40 formed in an arc shape. The starting end of the conical tapered surface 38 is an edge (see FIG. 2).

【００２６】更に、前記クランクプーリ３１のベルト装
着溝部３１Ｃの円錐状テーパ面３８形成側外側面の裏側
の内側面４１は、該円錐状テーパ面３８と平行に形成さ
れる。前記タイミングベルトカバー２８のクランクシャ
フト２０貫通部は、筒部４２Ａと該筒部４２Ａ先端外周
端から軸直角な面内に延びるフランジ部４２Ｂとを有す
る筒状部材４２から構成される。Further, an inner side surface 41 on the back side of the outer side of the conical tapered surface 38 forming side of the belt mounting groove portion 31C of the crank pulley 31 is formed in parallel with the conical tapered surface 38. The crankshaft 20 penetrating portion of the timing belt cover 28 is composed of a tubular member 42 having a tubular portion 42A and a flange portion 42B extending in a plane perpendicular to the axis from the outer peripheral end of the distal end of the tubular portion 42A.

【００２７】この場合、筒状部材４２の筒部４２Ａは、
タイミングベルトカバー２８の貫通孔３０にクランクプ
ーリ３１側に突出されて一体形成された筒部２８Ａ内周
面に嵌合取付される。ここで、前記筒状部材４２のフラ
ンジ部４２Ｂ先端部の軸方向位置は、図２に示すよう
に、前記クランクプーリ３１のベルト装着溝部３１Ｃの
円錐状テーパ面３８の始端部Ａ位置に略合致させ、前記
フランジ部４２Ｂ先端部と円錐状テーパ面３８の始端部
Ａとの間に所定の環状クリアランスＣ1 を設けるように
する。In this case, the tubular portion 42A of the tubular member 42 is
The timing belt cover 28 is fitted and attached to the inner peripheral surface of the cylindrical portion 28A which is integrally formed by protruding through the through hole 30 toward the crank pulley 31 side. Here, the axial position of the tip end portion of the flange portion 42B of the tubular member 42 substantially coincides with the position of the starting end portion A of the conical tapered surface 38 of the belt mounting groove portion 31C of the crank pulley 31, as shown in FIG. Then, a predetermined annular clearance C 1 is provided between the front end of the flange 42B and the starting end A of the conical tapered surface 38.

【００２８】特に、本実施例では、前記筒状部材４２の
フランジ部４２Ｂ先端の両側の２つの角部のうちシリン
ダブロック寄りの角部Ｃを、前記円錐状テーパ面３８の
始端部Ａ位置よりもシリンダブロック２１寄りに若干ず
らして位置させるようにする。一方、前記タイミングベ
ルトカバー２８のクランクプーリ３１のベルト装着溝部
３１Ｃ外側面に対面する部位には、該ベルト装着溝部３
１Ｃ外側面に向けて膨出する膨出部２８Ｂが一体成形さ
れている。In particular, in this embodiment, of the two corners on both sides of the end of the flange 42B of the tubular member 42, the corner C near the cylinder block is located closer to the starting end A of the conical taper surface 38 than the position A. Is also slightly displaced toward the cylinder block 21. On the other hand, in the portion of the timing belt cover 28 facing the outer surface of the belt mounting groove portion 31C of the crank pulley 31, the belt mounting groove portion 3 is provided.
A bulging portion 28B bulging toward the outer surface of 1C is integrally formed.

【００２９】この膨出部２８Ｂ先端とベルト装着溝部３
１Ｃ外側面とは所定のクリアランスＣ2 をもつように設
定される。前記シリンダブロック２１の壁部２１Ａの最
底部に位置する取付フランジ部２１ａには、タイミング
ベルトカバー２８内面とシリンダブロック２１の壁部２
１Ａ端面との間に形成される空所４３とその外部とを連
通する水抜き孔４４が、空所４３からその外部に下向き
に傾斜するように形成されており、この水抜き孔４４か
らタイミングベルトカバー２８内側にたまたま侵入して
空所４３の最底部に溜まろうとする水を外部に抜くこと
ができるようになっている。The tip of the bulge 28B and the belt mounting groove 3
The 1C outer surface is set to have a predetermined clearance C 2 . The mounting flange portion 21a located at the bottom of the wall portion 21A of the cylinder block 21 has an inner surface of the timing belt cover 28 and the wall portion 2 of the cylinder block 21.
A drainage hole 44, which communicates with the outside of the void 43 formed between the void 1A and the end face of the 1A, is formed so as to incline downward from the void 43 to the outside thereof. Water that happens to enter the inside of the belt cover 28 and collects at the bottom of the void 43 can be drained to the outside.

【００３０】次に、かかる構成の作用・効果について説
明する。 （１）ベルト装着溝部３１Ｃの円錐状テーパ面３８の始
端部Ａと、タイミングベルトカバー２８側の筒状部材４
２のフランジ部４２Ｂ先端部とのクリアランスＣ 1 は、
両者が干渉しないために必要な最小限に設定することに
より、両者間から水がタイミングベルトカバー２８側の
筒状部材４２内側に侵入するのが極力防止される。Next, the operation and effect of this structure will be explained.
Reveal (1) Start of conical taper surface 38 of belt mounting groove 31C
The end portion A and the tubular member 4 on the timing belt cover 28 side
Clearance C with the tip of the flange 42B of 2 1Is
In setting the minimum necessary so that both sides do not interfere
As a result, water will flow between the two on the timing belt cover 28 side.
It is prevented as much as possible from entering the inside of the tubular member 42.

【００３１】又、このクリアランスＣ1 を介して水が侵
入しようとすると、水は回転するクランクプーリ３１の
ベルト装着溝部３１Ｃの円錐状テーパ面３８によって飛
散され、タイミングベルトカバー２８側の筒状部材４２
内側に侵入するのが極力防止される。ここで、上記の構
成においては、筒状部材４２のフランジ部４２Ｂ先端部
の軸方向位置を、円錐状テーパ面３８の始端部Ａ位置に
略合致させた結果、タイミングベルトカバー２８の取付
位置の公差により、該タイミングベルトカバー２８の軸
方向位置が変化しても、フランジ部４２Ｂ先端部とクラ
ンクプーリ３１のベルト装着溝部３１Ｃとのクリアラン
ス量が変化せず、両者が干渉し合うことがない。When water tries to enter through the clearance C 1 , the water is scattered by the conical tapered surface 38 of the belt mounting groove portion 31C of the rotating crank pulley 31, and the tubular member on the timing belt cover 28 side. 42
Intrusion inside is prevented as much as possible. Here, in the above configuration, as a result of making the axial position of the tip end portion of the flange portion 42B of the tubular member 42 substantially coincide with the position of the starting end portion A of the conical tapered surface 38, the mounting position of the timing belt cover 28 is changed. Due to the tolerance, even if the axial position of the timing belt cover 28 changes, the clearance amount between the tip end portion of the flange portion 42B and the belt mounting groove portion 31C of the crank pulley 31 does not change, and the two do not interfere with each other.

【００３２】この結果、水の飛散効果を増すために円錐
状テーパ面３８の傾斜角度θ1 を大きく設定した場合で
も、フランジ部４２Ｂ先端部とクランクプーリ３１のベ
ルト装着溝部３１Ｃとのクリアランス量を予め小さくで
きる。このため、水の飛散効果を高めることができると
同時に、タイミングベルトカバー２８のクランクシャフ
ト２０の貫通孔３０からの水の侵入の防止効果が満足す
るように得られ、防水効果を大幅に高めることができ
る。 （２）特に、本実施例においては、筒状部材４２のフラ
ンジ部４２Ｂ先端の両側の２つの角部のうちシリンダブ
ロック２１寄りの角部Ｃを、円錐状テーパ面３８の始端
部Ａ位置よりもシリンダブロック２１寄りに若干ずらし
て位置させるようにしたから、タイミングベルトカバー
２８の取付位置の公差によるタイミングベルトカバー２
８の軸方向位置の変化量を十分に許容できるから、上記
の効果はより発揮される。 （３）本構成では、クランクプーリ３１の構造とタイミ
ングベルトカバー２８の構造との設計変更のみによって
対応できるから、水切を行うための別部品を付加する必
要がなく、部品点数を低減でき、構成の簡略化を図れ
て、コスト的に有利である。 （４）シリンダブロック２１の壁部２１Ａの最底部に位
置する取付フランジ部２１ａに水抜き孔４４を設けるよ
うにしたから、タイミングベルトカバー２８内側にたま
たま侵入した水を空所４３の最底部からスムーズに抜く
ことができ、タイミングベルトカバー２８内側に水が溜
まるのを防止できる。 （５）クランクプーリ３１のベルト装着溝部３１Ｃの円
錐状テーパ面３８形成側外側面の裏側の内側面４１を、
該円錐状テーパ面３８と平行に形成するようにしたか
ら、円錐状テーパ面３８に付着した水による冷却効果
で、ベルト装着溝部３１Ｃのベルトとの摩擦発熱を緩和
することができる。As a result, even when the inclination angle θ 1 of the conical tapered surface 38 is set large in order to increase the effect of splashing water, the clearance amount between the tip end portion of the flange portion 42B and the belt mounting groove portion 31C of the crank pulley 31 is increased. It can be made smaller in advance. Therefore, the effect of splashing water can be enhanced, and at the same time, the effect of preventing the entry of water from the through hole 30 of the crankshaft 20 of the timing belt cover 28 can be obtained, and the waterproof effect can be significantly enhanced. You can (2) In particular, in this embodiment, the corner C near the cylinder block 21 of the two corners on both sides of the tip end of the flange portion 42B of the tubular member 42 is located closer to the starting end A position of the conical tapered surface 38. Also, the timing belt cover 2 is positioned slightly offset to the cylinder block 21 side.
Since the amount of change in the axial position of No. 8 can be sufficiently tolerated, the above effect is more exerted. (3) In this configuration, since it is possible to deal with it only by changing the design of the structure of the crank pulley 31 and the structure of the timing belt cover 28, it is not necessary to add a separate component for draining the water, and the number of components can be reduced. Can be simplified, which is advantageous in terms of cost. (4) Since the drainage hole 44 is provided in the mounting flange portion 21a located at the bottom of the wall 21A of the cylinder block 21, the water that happens to enter the inside of the timing belt cover 28 from the bottom of the void 43 is generated. It can be removed smoothly, and water can be prevented from collecting inside the timing belt cover 28. (5) The inner surface 41 on the back side of the outer surface on the side where the conical tapered surface 38 is formed of the belt mounting groove portion 31C of the crank pulley 31 is
Since it is formed in parallel with the conical tapered surface 38, the frictional heat generated by the water attached to the conical tapered surface 38 with the belt in the belt mounting groove portion 31C can be alleviated by the cooling effect.

【００３３】次に、本発明の他の実施例を図３に基づい
て説明する。この実施例は、クランクプーリ３１の連接
部３１Ｂとベルト装着溝部３１Ｃとの境部位置から円錐
状テーパ面３８の始端部Ａ位置に向かう部分を、該境部
位置から始端部Ａ位置に向かうに連れてタイミングベル
トカバー２８に徐々に近寄るように軸に対して円錐状テ
ーパ面３８の傾斜角度θ1 よりも小なる所定角度θ2で
傾斜する円錐状テーパ面４５に形成している。Next, another embodiment of the present invention will be described with reference to FIG. In this embodiment, the portion from the boundary position between the connecting portion 31B of the crank pulley 31 and the belt mounting groove portion 31C to the starting end portion A position of the conical tapered surface 38 is moved from the boundary portion position to the starting end portion A position. The conical tapered surface 45 is formed so as to gradually approach the timing belt cover 28 at a predetermined angle θ 2 smaller than the inclination angle θ 1 of the conical tapered surface 38 with respect to the axis.

【００３４】かかる実施例によると、タイミングベルト
カバー２８側の筒状部材４２内側に侵入しようとした水
の大部分は大きな傾斜角θ1 の円錐状テーパ面３８で飛
散させることができ、該テーパ面３８よりも奥側に侵入
せんとする水は小さな傾斜角の円錐状テーパ面４５で飛
散させて更に奥側に水が侵入するのを防止でき、水の侵
入を２つの異なる傾斜角度のテーパ面３８，４５でより
効果的に防止することができるという利点がある。According to this embodiment, most of the water trying to enter the inside of the tubular member 42 on the side of the timing belt cover 28 can be scattered by the conical tapered surface 38 having a large inclination angle θ 1 , and the taper Water that enters the back side of the surface 38 can be scattered by the conical taper surface 45 having a small inclination angle to prevent the water from further entering the back side, and the water intrusion can be tapered at two different inclination angles. There is an advantage that the surfaces 38 and 45 can be more effectively prevented.

【００３５】[0035]

【発明の効果】以上説明したように、請求項１記載の発
明によれば、タイミングベルト配設部を覆うようにシリ
ンダブロック壁に取り付けられるタイミングベルトカバ
ー内側に水が侵入するのを極力防止でき、タイミングベ
ルトの防水を確実に行えると共に、タイミングベルトカ
バーのクランクシャフト貫通部を構成する筒状部のフラ
ンジ部先端部の軸方向位置を、円錐状テーパ面の始端部
位置に略合致させ、該フランジ部先端部と円錐状テーパ
面の始端部との間に所定の環状クリアランスを設けるよ
うにしたから、タイミングベルトカバーの軸方向位置が
変化しても、フランジ部先端部とクランクプーリのベル
ト装着溝部とのクリアランス量が変化せず、両者が干渉
し合うことを防止でき、これにより、水の飛散効果を増
すために円錐状テーパ面の傾斜角度を大きく設定した場
合でも、フランジ部先端部とクランクプーリのベルト装
着溝部とのクリアランス量を予め小さくできる結果、水
の飛散効果を高めることができると同時に、水の侵入の
防止効果が満足するように得られ、防水効果を大幅に高
めることができ、しかも、クランクプーリの構造とタイ
ミングベルトカバーの構造との設計変更のみによって対
応できるから、水切を行うための別部品を付加する必要
がなく、部品点数を低減でき、構成の簡略化を図れて、
コスト的に有利である。As described above, according to the invention of claim 1, water can be prevented as much as possible from entering the inside of the timing belt cover attached to the cylinder block wall so as to cover the timing belt arrangement portion. , The timing belt can be surely waterproofed, and the axial position of the flange tip end portion of the tubular portion forming the crankshaft penetrating portion of the timing belt cover is substantially matched with the starting end portion position of the conical tapered surface, Since a predetermined annular clearance is provided between the tip of the flange and the start of the conical tapered surface, even if the axial position of the timing belt cover changes, the flange of the flange and the belt of the crank pulley can be attached. The clearance amount with the groove does not change, and it is possible to prevent the two from interfering with each other. Even if the inclination angle of the surface is set to a large value, the amount of clearance between the tip of the flange and the belt mounting groove of the crank pulley can be reduced in advance, so that the water splash effect can be improved and at the same time the prevention of water intrusion. The effect is satisfied, the waterproof effect can be greatly increased, and it can be handled only by changing the design of the structure of the crank pulley and the structure of the timing belt cover, so additional parts for draining are added. The number of parts can be reduced and the configuration can be simplified.
It is cost effective.

【００３６】請求項２記載の発明によれば、タイミング
ベルトカバーのクランクシャフト貫通部を構成する筒状
部のフランジ部先端の両側の２つの角部のうちシリンダ
ブロック寄りの角部を、円錐状テーパ面の始端部位置よ
りもシリンダブロック寄りに若干ずらして位置させるよ
うにしたから、上記の効果はより発揮される。請求項３
記載の発明によれば、クランクプーリの連接部とベルト
装着溝部との境部位置から前記円錐状テーパ面の始端部
位置に向かう部分を、該境部位置から始端部位置に向か
うに連れてタイミングベルトカバーに徐々に近寄るよう
に軸に対して前記円錐状テーパ面の傾斜角度よりも小な
る所定角度で傾斜する円錐状テーパ面に形成したから、
水の侵入を２つの異なる傾斜角度のテーパ面でより効果
的に防止することができるという利点がある。According to the second aspect of the present invention, of the two corners on both sides of the tip of the flange of the cylindrical portion forming the crankshaft penetrating portion of the timing belt cover, the corner closer to the cylinder block is conical. The above effect is more exerted because the taper surface is positioned slightly offset from the starting end position of the tapered surface toward the cylinder block. Claim 3
According to the invention described above, the portion of the conical taper surface from the boundary position between the connecting portion of the crank pulley and the belt mounting groove portion toward the starting end position is timinged from the boundary position toward the starting end position. Since it is formed into a conical taper surface which is inclined at a predetermined angle smaller than the inclination angle of the conical taper surface with respect to the axis so as to gradually approach the belt cover,
There is an advantage that the invasion of water can be more effectively prevented by the tapered surfaces having two different inclination angles.

【００３７】請求項４記載の発明によれば、シリンダブ
ロック壁のタイミングベルトカバー取付部の最底部に、
タイミングベルトカバー内面と前記タイミングベルトカ
バー取付部との間とその外部とを連通する水抜き孔を形
成したから、タイミングベルトカバー内側に水が溜まる
のを防止できる。請求項５記載の発明によれば、クラン
クプーリのベルト装着溝部の円錐状テーパ面形成側外側
面の裏側の内側面を、該円錐状テーパ面と平行に形成し
たから、ベルト装着溝部のベルトとの摩擦発熱を緩和す
ることができる。According to the invention described in claim 4, at the bottom of the timing belt cover mounting portion of the cylinder block wall,
Since the water drain hole is formed to connect the inner surface of the timing belt cover and the mounting portion of the timing belt cover to the outside thereof, it is possible to prevent water from collecting inside the timing belt cover. According to the invention of claim 5, the inner surface of the crank pulley belt mounting groove portion on the back side of the outer surface of the conical tapered surface forming side is formed in parallel with the conical tapered surface. It is possible to alleviate frictional heat generation.

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

【図１】 請求項１〜５記載の発明に係る内燃機関にお
けるタイミングベルトの防水構造の一実施例を示す縦断
面図FIG. 1 is a longitudinal sectional view showing an embodiment of a waterproof structure for a timing belt in an internal combustion engine according to the invention as claimed in claims 1 to 5.

【図２】 同上実施例の要部拡大断面図FIG. 2 is an enlarged cross-sectional view of a main part of the above embodiment.

【図３】 他の実施例を示す要部拡大断面図FIG. 3 is an enlarged sectional view of an essential part showing another embodiment.

【図４】 従来の内燃機関におけるタイミングベルトの
防水構造の一例を示す縦断面図FIG. 4 is a vertical sectional view showing an example of a waterproof structure for a timing belt in a conventional internal combustion engine.

【符号の説明】[Explanation of symbols]

２０ クランクシャフト ２１ シリンダブロック ２３ タイミングプーリ ２５ タイミングベルト ３１ クランクプーリ ３１Ａ 筒状取付部 ３１Ｂ 連接部 ３１Ｃ ベルト装着溝部 ３８ 円錐状テーパ面 ４２ 筒状部材 ４２Ａ 筒部 ４２Ｂ フランジ部 ４４ 水抜き孔 ４５ 円錐状テーパ面 20 crankshaft 21 cylinder block 23 timing pulley 25 timing belt 31 crank pulley 31A tubular mounting portion 31B connecting portion 31C belt mounting groove portion 38 conical tapered surface 42 tubular member 42A tubular portion 42B flange portion 44 drain hole 45 conical taper surface

Claims (5)

【特許請求の範囲】[Claims] 【請求項１】シリンダブロック壁を貫通して外部に突出
されるクランクシャフト端部外周に、タイミングベルト
が巻き掛けられるタイミングプーリを装着し、該タイミ
ングベルト配設部を覆うようにシリンダブロック壁に取
り付けられるタイミングベルトカバーを貫通させて外部
に突出させたクランクシャフト先端部にベルトが巻き掛
けられるクランクプーリを装着してなる内燃機関におい
て、 前記クランクプーリに、クランクシャフトへの取付部
と、該取付部外周に連接されて略軸直角な面内に延びる
環状の連接部と、該連接部の外周部にタイミングベルト
カバー側に張り出して連接される環状のベルト装着溝部
とを少なくとも設け、 前記クランクプーリのベルト装着溝部のタイミングベル
トカバーに面する外側面の内端側から外端側に向かう所
定幅部分を、該内端側から外端側に向かうに連れてタイ
ミングベルトカバーに徐々に近寄るように軸に対して所
定角度で傾斜する円錐状テーパ面に形成し、 前記タイミングベルトカバーのクランクシャフト貫通部
を、筒部と該筒部先端外周端から軸直角な面内に延びる
フランジ部とを有する筒状部から構成し、 前記筒状部のフランジ部先端部の軸方向位置を、円錐状
テーパ面の始端部位置に略合致させ、該フランジ部先端
部と円錐状テーパ面の始端部との間に所定の環状クリア
ランスを設けたことを特徴とする内燃機関におけるタイ
ミングベルトの防水構造。1. A timing pulley around which a timing belt is wound is mounted on the outer circumference of a crankshaft end portion which penetrates through a cylinder block wall and projects to the outside, and the cylinder block wall is covered with a timing pulley so as to cover the timing belt installation portion. An internal combustion engine in which a crank pulley around which a belt is wound is attached to a crank shaft tip end portion that penetrates a timing belt cover that is attached and protrudes to the outside, wherein the crank pulley is attached to the crank shaft and the attachment portion. At least an annular connecting portion that is connected to the outer periphery of the portion and extends in a plane that is substantially perpendicular to the axis, and an annular belt mounting groove portion that extends and connects to the timing belt cover side are provided on the outer peripheral portion of the connecting portion. Of the belt mounting groove from the inner surface of the outer surface facing the belt cover to the outer surface. The predetermined width portion is formed into a conical taper surface inclined at a predetermined angle with respect to the axis so as to gradually approach the timing belt cover from the inner end side toward the outer end side. The crankshaft penetrating portion is composed of a tubular portion having a tubular portion and a flange portion extending in a plane perpendicular to the axis from the tip outer peripheral end of the tubular portion, and the axial position of the flange portion distal end portion of the tubular portion, A waterproof structure for a timing belt in an internal combustion engine, characterized in that a predetermined annular clearance is provided between the tip end of the flange and the start end of the conical taper surface so as to substantially coincide with the start end position of the conical taper surface. . 【請求項２】前記筒状部のフランジ部先端の両側の２つ
の角部のうちシリンダブロック寄りの角部を、前記クラ
ンクプーリのベルト装着溝部の円錐状テーパ面の始端部
位置よりもシリンダブロック寄りにずらして位置させた
ことを特徴とする請求項１記載の内燃機関におけるタイ
ミングベルトの防水構造。2. The cylinder block, of the two corners on both sides of the end of the flange of the cylindrical portion, closer to the cylinder block than the starting end of the conical taper surface of the belt mounting groove of the crank pulley. The waterproof structure for a timing belt in an internal combustion engine according to claim 1, wherein the waterproof structure is arranged so as to be shifted toward the side. 【請求項３】前記クランクプーリの連接部とベルト装着
溝部との境部位置から前記円錐状テーパ面の始端部位置
に向かう部分を、該境部位置から始端部位置に向かうに
連れてタイミングベルトカバーに徐々に近寄るように軸
に対して前記円錐状テーパ面の傾斜角度よりも小なる所
定角度で傾斜する円錐状テーパ面に形成したことを特徴
とする請求項１又は２記載の内燃機関におけるタイミン
グベルトの防水構造。3. A timing belt that moves from the boundary position between the connecting portion of the crank pulley and the belt mounting groove portion toward the starting end position of the conical tapered surface toward the starting end position. 3. The internal combustion engine according to claim 1, wherein the conical taper surface is formed so as to gradually approach the cover at a predetermined angle smaller than the inclination angle of the conical taper surface with respect to the axis. Timing belt waterproof structure. 【請求項４】シリンダブロック壁のタイミングベルトカ
バー取付部の最底部に、タイミングベルトカバー内面と
前記タイミングベルトカバー取付部との間とその外部と
を連通する水抜き孔を形成したことを特徴とする請求項
１〜３のうちいずれか１つに記載の内燃機関におけるタ
イミングベルトの防水構造。4. A drainage hole is formed at the bottom of the timing belt cover mounting portion of the cylinder block wall so as to communicate between the inner surface of the timing belt cover and the timing belt cover mounting portion and the outside thereof. The waterproof structure for a timing belt in an internal combustion engine according to any one of claims 1 to 3. 【請求項５】前記クランクプーリのベルト装着溝部の円
錐状テーパ面形成側外側面の裏側の内側面を、該円錐状
テーパ面と平行に形成した請求項１〜４のうちいずれか
１つに記載の内燃機関におけるタイミングベルトの防水
構造。5. The inner side surface on the back side of the outer surface of the conical taper surface forming side of the belt mounting groove portion of the crank pulley is formed in parallel with the conical taper surface. A waterproof structure for a timing belt in an internal combustion engine as described.
JP06294183A 1994-11-29 1994-11-29 Timing belt waterproof structure for internal combustion engine Expired - Lifetime JP3075105B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP06294183A JP3075105B2 (en) 1994-11-29 1994-11-29 Timing belt waterproof structure for internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP06294183A JP3075105B2 (en) 1994-11-29 1994-11-29 Timing belt waterproof structure for internal combustion engine

Publications (2)

Publication Number Publication Date
JPH08151932A true JPH08151932A (en) 1996-06-11
JP3075105B2 JP3075105B2 (en) 2000-08-07

Family

ID=17804391

Family Applications (1)

Application Number Title Priority Date Filing Date
JP06294183A Expired - Lifetime JP3075105B2 (en) 1994-11-29 1994-11-29 Timing belt waterproof structure for internal combustion engine

Country Status (1)

Country Link
JP (1) JP3075105B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190136758A1 (en) * 2017-11-08 2019-05-09 Hyundai Motor Company Pulley system for crankshaft

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190136758A1 (en) * 2017-11-08 2019-05-09 Hyundai Motor Company Pulley system for crankshaft
US10815880B2 (en) * 2017-11-08 2020-10-27 Hyundai Motor Company Pulley system for crankshaft

Also Published As

Publication number Publication date
JP3075105B2 (en) 2000-08-07

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