JP4730556B2 - Belt tension adjuster - Google Patents

Belt tension adjuster Download PDF

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JP4730556B2
JP4730556B2 JP2006241257A JP2006241257A JP4730556B2 JP 4730556 B2 JP4730556 B2 JP 4730556B2 JP 2006241257 A JP2006241257 A JP 2006241257A JP 2006241257 A JP2006241257 A JP 2006241257A JP 4730556 B2 JP4730556 B2 JP 4730556B2
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tool
adjusting device
belt tension
belt
tension adjusting
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JP2008064172A (en
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寛之 井上
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Suzuki Motor Co Ltd
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Description

この発明はベルト張力調整装置に係り、特に、複数のプーリ間に巻き掛けられたベルトの張力を、テンショナプーリによって調整するベルト張力調整装置に関する。   The present invention relates to a belt tension adjusting device, and more particularly to a belt tension adjusting device that adjusts tension of a belt wound between a plurality of pulleys by a tensioner pulley.

内燃機関においては、ウォータポンプやオルタネータ等の補機類を設け、これらの補機類を駆動するために、各補機類の軸やクランク軸に設けた複数のプーリ間に動力を伝達するベルトを捲き掛けている。内燃機関は、このベルトに適正な張力を与えて動力を伝達するために、ベルト張力調整装置を備えている。   In an internal combustion engine, belts that provide auxiliary equipment such as a water pump and an alternator and transmit power between a plurality of pulleys provided on the shafts and crankshafts of the auxiliary machines in order to drive these auxiliary machines. I'm asking. The internal combustion engine includes a belt tension adjusting device in order to transmit power by applying appropriate tension to the belt.

従来のベルト張力調整装置には、複数のプーリ間に動力を伝達するベルトを巻き掛け、このベルトに張力を与えるテンショナプーリをアジャストボルトで移動させ、ベルト張力を調整する構造のものがある。
実開平５−３７１０号公報 A conventional belt tension adjusting device has a structure in which a belt that transmits power is wound between a plurality of pulleys, and a tensioner pulley that applies tension to the belt is moved by an adjusting bolt to adjust the belt tension.
Japanese Utility Model Publication No. 5-3710

また、従来のベルト張力調整装置には、テンショナプーリを回転可能に支持するテンショナブラケットの基端部をテンショナプーリの回転軸に平行なボルトによって台座に締結するとともに、テンショナブラケットの先端に工具を係合する工具係合部を形成する構造のものがある。
実開平２−８４０４２号公報 Further, in the conventional belt tension adjusting device, the base end portion of the tensioner bracket that rotatably supports the tensioner pulley is fastened to the pedestal by a bolt parallel to the rotation shaft of the tensioner pulley, and a tool is engaged with the tip of the tensioner bracket. There is a structure that forms a mating tool engaging portion.
Japanese Utility Model Publication 2-84042

ところが、前記特許文献１のベルト張力調整装置は、アジャストボルトによってテンショナプーリを移動させる構造であるため、部品点数が増加するとともに、組付け作業性が低下する問題があった。
上記問題を解決するために、前記特許文献２のベルト張力調整装置は、テンショナプーリを回転可能に支持して台座に基端側をボルトにより締結されるテンショナブラケットを設け、このテンショナブラケットの先端に張力調整用の工具を係合する工具係合部を形成した構造としている。
しかし、前記特許文献２のベルト張力調整装置は、工具係合部が、張力調整用の工具であるエクステンションバーと係合する溝や、モンキースパナで挟持する平行面を形成した構造であるため、テンショナブラケット自体を厚さの厚い材料で形成する必要があるとともに、溝や平行面の幅の寸法精度を所定範囲に管理することが必要であり、製造性が悪化する問題があった。 However, since the belt tension adjusting device of Patent Document 1 has a structure in which the tensioner pulley is moved by an adjusting bolt, there are problems that the number of parts increases and the assembling workability decreases.
In order to solve the above problem, the belt tension adjusting device of Patent Document 2 is provided with a tensioner bracket that rotatably supports a tensioner pulley and is fastened to a pedestal with a base end side by a bolt, and is provided at the tip of the tensioner bracket. A tool engaging portion for engaging a tension adjusting tool is formed.
However, the belt tension adjusting device of Patent Document 2 has a structure in which the tool engaging portion is formed with a groove that engages with an extension bar that is a tension adjusting tool or a parallel surface that is sandwiched by a monkey spanner. The tensioner bracket itself needs to be formed of a thick material, and it is necessary to manage the dimensional accuracy of the widths of the grooves and parallel surfaces within a predetermined range, resulting in a problem that the manufacturability deteriorates.

この発明は、棒状の工具と係合する工具係合部を備えたテンショナブラケットを形成する際、ベルト張力調整装置の構造を簡素化して製造性を向上させるとともに、ベルト張力調整装置を小型化して周辺空間の少ない場所にも配設できる構造とすることが目的である。   The present invention simplifies the structure of the belt tension adjusting device to improve manufacturability when forming a tensioner bracket having a tool engaging portion that engages with a rod-shaped tool, and reduces the size of the belt tension adjusting device. It is an object to provide a structure that can be disposed even in a small space.

この発明は、複数のプーリ間に動力を伝達するベルトを巻き掛け、このベルトに張力を与えるテンショナプーリをテンショナブラケットに取り付け、このテンショナブラケットに揺動軸を挿入する揺動軸用孔部と、固定具を挿入する固定具用孔部と、棒状の工具と係合する工具係合部とを設け、ベルト張力調整時に、前記テンショナブラケットを前記工具によって前記揺動軸の回りに揺動させるとともに前記固定具によって所定位置に固定するベルト張力調整装置において、前記テンショナブラケットを前記揺動軸用孔部が設けられる第１平面部と、前記固定具用孔部が設けられる第２平面部と、これら両者の間を連絡する連絡面部とを有する薄板で形成し、前記連絡面部に前記第１平面部または前記第２平面部の少なくとも一方と段差をなす段差部を形成し、この段差部の幅方向端部に前記棒状の工具と当接する当接部を形成する一方、この当接部と反対側から前記棒状の工具の周面に係止する係止片を前記テンショナブラケットの外周部に形成し、前記当接部と前記係止片とによって前記工具係合部を構成したことを特徴とする。   This invention wraps a belt that transmits power between a plurality of pulleys, attaches a tensioner pulley that applies tension to the belt to the tensioner bracket, and inserts a swing shaft into the tensioner bracket. A fixing tool hole for inserting the fixing tool and a tool engaging portion for engaging with a rod-shaped tool are provided, and the tensioner bracket is swung around the swinging shaft by the tool when adjusting the belt tension. In a belt tension adjusting device that fixes the tensioner bracket at a predetermined position by the fixture, a first plane portion in which the pivot shaft hole is provided, a second plane portion in which the fixture hole is provided, The connecting surface portion is formed of a thin plate having a connecting surface portion that communicates between the two, and the connecting surface portion has a step difference with at least one of the first planar portion or the second planar portion. A step portion is formed, and a contact portion that contacts the rod-shaped tool is formed at an end in the width direction of the step portion, and the engagement portion is engaged with the peripheral surface of the rod-shaped tool from the side opposite to the contact portion. A stop piece is formed on an outer peripheral portion of the tensioner bracket, and the tool engaging portion is constituted by the contact portion and the locking piece.

この発明のベルト張力調整装置は、棒状の工具と係合する工具係合部を備えたテンショナブラケットを形成する際、工具係合部をテンショナブラケットに一体で且つ、薄板に簡単な曲げ加工を行うことで形成できる。これによって、この発明のベルト張力調整装置は、テンショナブラケットの構造を簡素化してベルト張力調整装置の製造性及び組付け作業性を向上できる。   In the belt tension adjusting device of the present invention, when forming a tensioner bracket having a tool engaging portion that engages with a rod-shaped tool, the tool engaging portion is integrated with the tensioner bracket and a simple bending process is performed on a thin plate. Can be formed. Accordingly, the belt tension adjusting device of the present invention can simplify the structure of the tensioner bracket and improve the manufacturability and assembly workability of the belt tension adjusting device.

この発明のベルト張力調整装置は、棒状の工具と係合する工具係合部を、テンショナブラケットに一体で且つ、薄板に簡単な曲げ加工で形成することで、テンショナブラケットの構造を簡素化してベルト張力調整装置の製造性及び組付け作業性を向上するものである。
以下図面に基づいて、この発明の実施例を説明する。 The belt tension adjusting device according to the present invention simplifies the structure of the tensioner bracket by forming the tool engaging portion that engages with the rod-shaped tool integrally with the tensioner bracket and by simple bending on the thin plate. This improves the manufacturability and assembly workability of the tension adjusting device.
Embodiments of the present invention will be described below with reference to the drawings.

図１〜図３は、この発明の実施例を示すものである。図１は内燃機関の正面図、図２はベルト張力調整装置の斜視図、図３はテンショナブラケットの正面図及び断面図である。
図１において、１は内燃機関、２はシリンダブロック、３はシリンダヘッド、４はシリンダヘッドカバー、５はオイルパン、６はチェーンカバー、７はクランク軸、８は吸気マニホルドである。内燃機関１は、シリンダ軸線Ｃが水平線Ｈに近づくように傾けて車両に搭載されている。
内燃機関１は、チェーンカバー６から突出されるクランク軸７に２つのクランクプーリ９・１０を取り付け、シリンダブロック２の下方且つオイルパン５の上方に補機であるオルタネータ１１を配設してオルタネータ軸１２にオルタネータプーリ１３を取り付け、シリンダブロック２の上方の側部に補機であるウォータポンプ１４を設けてポンプ軸１５にポンププーリ１６を取り付けている。
内燃機関１は、一方のクランクプーリ９とオルタネータプーリ１３とに補機駆動用のベルト１７を巻き掛け、クランク軸７の回転をベルト１７を介してオルタネータ軸１２に伝達し、オルタネータ１１を駆動する。また、内燃機関１は、他方のクランクプーリ１０とポンププーリ１６とに補機駆動用のベルト１８を巻き掛け、クランク軸７の回転をベルト１８を介してポンプ軸１５に伝達し、ウォータポンプ１４を駆動する。
内燃機関１は、前記クランクプーリ９とオルタネータプーリ１３とに巻き掛けられたベルト１７の張力を調整するベルト張力調整装置１９を備えている。ベルト張力調整装置１９は、シリンダブロック２の上方の側部であってシリンダブロック２の下部に取り付けたオルタネータブラケット２０にオルタネータ１１の径方向一側を揺動軸である揺動ボルト２１により揺動可能に取り付け、オイルパン５の上方の側部に取り付けたオルタネータアーム２２の固定具用孔部２３にオルタネータ１１の径方向他側を固定具である固定ボルト２４により固定している。
このベルト張力調整装置１９は、ベルト１７の張力調整時に、図１に矢印で示すようにオルタネータ１１を引張り、オルタネータ１１を径方向一側を中心として揺動ボルト２１の回りに揺動させ、オルタネータ１１の径方向他側をオルタネータアーム２２の固定具用孔部２３に沿って移動させ、固定ボルト２４によってオルタネータ１１の径方向他側を、ベルト１７に適正な張力を与えるようにオルタネータアーム２２の所定位置に固定する。 1 to 3 show an embodiment of the present invention. 1 is a front view of an internal combustion engine, FIG. 2 is a perspective view of a belt tension adjusting device, and FIG. 3 is a front view and a sectional view of a tensioner bracket.
In FIG. 1, 1 is an internal combustion engine, 2 is a cylinder block, 3 is a cylinder head, 4 is a cylinder head cover, 5 is an oil pan, 6 is a chain cover, 7 is a crankshaft, and 8 is an intake manifold. The internal combustion engine 1 is mounted on a vehicle so that the cylinder axis C is inclined so as to approach the horizontal line H.
In the internal combustion engine 1, two crank pulleys 9 and 10 are attached to a crankshaft 7 protruding from a chain cover 6, and an alternator 11 as an auxiliary machine is disposed below the cylinder block 2 and above the oil pan 5. An alternator pulley 13 is attached to the shaft 12, a water pump 14 that is an auxiliary machine is provided on the upper side of the cylinder block 2, and a pump pulley 16 is attached to the pump shaft 15.
The internal combustion engine 1 wraps an auxiliary machine driving belt 17 around one crank pulley 9 and an alternator pulley 13, transmits the rotation of the crankshaft 7 to the alternator shaft 12 via the belt 17, and drives the alternator 11. . Further, the internal combustion engine 1 wraps an auxiliary drive belt 18 around the other crank pulley 10 and the pump pulley 16, and transmits the rotation of the crankshaft 7 to the pump shaft 15 via the belt 18. To drive.
The internal combustion engine 1 includes a belt tension adjusting device 19 that adjusts the tension of a belt 17 wound around the crank pulley 9 and the alternator pulley 13. The belt tension adjusting device 19 is swung on an alternator bracket 20 attached to the lower side of the cylinder block 2 on the upper side of the cylinder block 2 by a rocking bolt 21 that is a rocking shaft on one side in the radial direction of the alternator 11. The other side in the radial direction of the alternator 11 is fixed to a fixing tool hole 23 of an alternator arm 22 attached to the upper side of the oil pan 5 by a fixing bolt 24 as a fixing tool.
When adjusting the tension of the belt 17, the belt tension adjusting device 19 pulls the alternator 11 as shown by an arrow in FIG. 1, and swings the alternator 11 around the swing bolt 21 around one radial direction. 11 is moved along the fixture hole 23 of the alternator arm 22, and the other side of the alternator 11 in the radial direction of the alternator 11 is applied to the belt 17 by a fixing bolt 24 so that an appropriate tension is applied to the belt 17. Fix in place.

また、この内燃機関１は、前記クランクプーリ１０とポンププーリ１６とに巻き掛けられたベルト１８の張力を調整するベルト張力調整装置２５を備えている。ベルト張力調整装置２５は、図２に示すように、ベルト１８に張力を与えるテンショナプーリ２６をテンショナブラケット２７にプーリ取付ボルト２８により回転自在に取り付けている。このテンショナブラケット２７には、揺動軸となる揺動ボルト２９を挿入する揺動軸用孔部３０と、固定具となる固定ボルト３１を挿入する固定具用孔部３２と、棒状の工具３３と係合する工具係合部３４とを設けている。テンショナブラケット２７は、シリンダブロック２の上方の側部であってシリンダブロック２の下部に取り付けた前記オルタネータブラケット２０に、揺動軸用孔部３０側を揺動ボルト２９により揺動可能に取り付けている。
このベルト張力調整装置２５は、ベルト１８の張力調整時に、図１に矢印で示すように工具３３を引張り、テンショナブラケット２７を工具３３によって揺動ボルト２９の回りに揺動させるとともに、テンショナブラケット２７の固定具用孔部３２側を固定ボルト３１に沿って移動させ、固定ボルト３１によってテンショナブラケット２７の固定具用孔部３２側を、ベルト１８に適正な張力を与えるようにシリンダブロック２の所定位置に固定する。
このウォータポンプ１４を駆動するベルト１８のベルト張力調整装置２５は、図３に示すように、テンショナブラケット２７を、揺動軸用孔部３０が設けられる第１平面部３５と、固定具用孔部３２が設けられる第２平面部３６と、これら両者３５・３６の間を連絡する連絡面部３７とを有する薄板で形成している。
前記連絡面部３７には、第１平面部３５または第２平面部３６の少なくとも一方と段差をなす段差部を形成している。この実施例のテンショナブラケット２７は、連絡面部３７の第１平面部３５側と第２平面部３６側とを同じ面側（図３（Ｂ）において、連絡面部３７の右面側）に折曲し、第１平面部３５側に第１段差部３８を形成するとともに、第２平面部３６側に第２段差部３９を形成している。連絡面部３７は、第１段差部３８により第１平面部３５に対して距離Ｌ１だけ平行にオフセットして形成される。第２平面部３６は、第２段差部３９により連絡面部３７に対して距離Ｌ２だけ平行にオフセットして形成される。
この第１段差部３５の幅方向一側（図３（Ａ）の左右方向における左側）の端部には、棒状の工具３３の周面と当接する当接部４０を形成している。一方、テンショナブラケット２７の外周部にある第２平面部３６の幅方向一側（図３（Ａ）の左右方向における左側）の端部には、当接部４０が当接する工具３３の周面に対して、径方向の反対側から工具３３の周面に係止する係止片４１を形成している。係止片４１は、第２平面部３６の幅方向一側の端部から平行に延長された延長部４２の先端に、この延長部４２と直交するように立設して形成している。これら当接部４０と係止片４１とによって、前記工具係合部３４を構成している。
これにより、このベルト張力調整装置２５は、棒状の工具３３と係合する工具係合部３４を備えたテンショナブラケット２７を形成する際、工具係合部３４を構成する当接部４０と係止片４１とをテンショナブラケット２７に一体で且つ、薄板に簡単な曲げ加工を行うことで形成することができる。
このため、このベルト張力調整装置２５は、テンショナブラケット２７の構造を簡素化してベルト張力調整装置２５の製造性及び組付け作業性を向上することができる。
前記テンショナブラケット２７は、図３（Ｂ）に示すように、連絡面部３７を第１段差部３８により第１平面部３５に対して平行にオフセットし、連絡面部３７に第１段差部３８を介して第１平面部３５と平行に延びるプーリ支持面４３を形成している。連絡面部３７には、プーリ支持面４３から反対側の面に貫通するプーリ取付孔４４を形成し、プーリ支持面４３と反対側の面にプーリ取付孔４４と中心が一致するプーリ取付ナット４５を固着している。連絡面部３７には、テンショナプーリ２６に挿通したプーリ取付ボルト２８をプーリ取付孔４４を介してプーリ取付ナット４５に螺着することにより、プーリ支持面４３にテンショナプーリ２６を支持させて回転自在に取り付けている。
これにより、このベルト張力調整装置２５は、テンショナプーリ２６の回転軸（この実施例においては、プーリ取付ボルト２８）を延長することなく、テンショナプーリ２６の幅方向中心（ベルト溝の中心）をベルト１８の幅方向中心（ベルト幅の中心）に合わせることができ、ベルト張力調整装置２５の製造性を向上できる。
前記テンショナブラケット２７は、図３（Ａ）に示すように、第２平面部３６に固定具用孔部２３を揺動軸用孔部３０と同一中心を有する円弧状の長孔に形成し、テンショナブラケット２７の輪郭線を固定具用孔部３２と揺動軸用孔部３０を囲む扇形に形成し、当接部４０を扇形の直線部分に配設している。
これにより、このベルト張力調整装置２５は、テンショナブラケット２７を小型化してベルト張力調整装置２５の製造性を向上させるとともに、周辺空間の少ない場所にも配設することができる。
前記テンショナブラケット２７は、連絡面部３７の幅方向一側（図３（Ａ）の左右方向における左側）の端部に、棒状の工具３３の周面と当接する突起部４６を形成している。突起部４６は、当接部４０及び係止片４１に当接された棒状の工具３３の中間であって、当接部４０及び係止片４１が径方向の反対側から当接する工具３３の周面に対して、径方向において直交する側であって且つ前記延長部４２に対して径方向の反対側から工具３３の周面に当接するように、連絡面部３７の幅方向一側の端部に形成している。
これにより、このベルト張力調整装２５は、当接部４０と係止片４１とに係合した工具３３によりベルト１８の張力を調整する際に、工具３３の周面に径方向の反対側から当接する当接部４０及び係止片４１と、これら当接部４０及び係止片４１と直交する側であって径方向の反対側から工具３３の周面に当接する延長部４２及び突起部４５とによって、工具３３を４方向から支持することができ、工具３３の外れを確実に防止して調整作業を容易に行うことができる。 The internal combustion engine 1 also includes a belt tension adjusting device 25 that adjusts the tension of the belt 18 wound around the crank pulley 10 and the pump pulley 16. In the belt tension adjusting device 25, as shown in FIG. 2, a tensioner pulley 26 that applies tension to the belt 18 is rotatably attached to a tensioner bracket 27 by pulley mounting bolts 28. The tensioner bracket 27 is provided with a rocking shaft hole 30 for inserting a rocking bolt 29 serving as a rocking shaft, a fixing tool hole 32 for inserting a fixing bolt 31 serving as a fixing tool, and a rod-shaped tool 33. And a tool engaging portion 34 to be engaged with each other. The tensioner bracket 27 is attached to the alternator bracket 20 mounted on the lower side of the cylinder block 2 on the upper side of the cylinder block 2 so that the swing shaft hole 30 side can be swung by a swing bolt 29. Yes.
When adjusting the tension of the belt 18, the belt tension adjusting device 25 pulls the tool 33 as shown by an arrow in FIG. 1 and swings the tensioner bracket 27 around the swing bolt 29 by the tool 33. Of the cylinder block 2 so that an appropriate tension is applied to the belt 18 on the side of the fixing tool hole 32 of the tensioner bracket 27 by the fixing bolt 31. Fix in position.
As shown in FIG. 3, the belt tension adjusting device 25 for the belt 18 that drives the water pump 14 includes a tensioner bracket 27, a first flat surface portion 35 provided with a swing shaft hole portion 30, and a fixing tool hole. It is formed of a thin plate having a second flat surface portion 36 on which the portion 32 is provided and a connecting surface portion 37 that communicates between both the members 35 and 36.
A stepped portion that forms a step with at least one of the first flat surface portion 35 or the second flat surface portion 36 is formed in the communication surface portion 37. In the tensioner bracket 27 of this embodiment, the first flat surface portion 35 side and the second flat surface portion 36 side of the connecting surface portion 37 are bent to the same surface side (the right surface side of the connecting surface portion 37 in FIG. 3B). The first step portion 38 is formed on the first plane portion 35 side, and the second step portion 39 is formed on the second plane portion 36 side. The connecting surface portion 37 is formed by being offset in parallel with the first flat surface portion 35 by the distance L1 by the first step portion 38. The second flat surface portion 36 is formed by being offset in parallel to the connecting surface portion 37 by a distance L2 by the second step portion 39.
An abutting portion 40 that abuts the peripheral surface of the rod-shaped tool 33 is formed at the end of the first step portion 35 on one side in the width direction (left side in the left-right direction in FIG. 3A). On the other hand, the circumferential surface of the tool 33 with which the abutting portion 40 abuts the end portion on the one side in the width direction (left side in the left-right direction in FIG. 3A) of the second flat portion 36 on the outer circumferential portion of the tensioner bracket 27. On the other hand, a locking piece 41 is formed to be locked to the peripheral surface of the tool 33 from the opposite side in the radial direction. The locking piece 41 is formed so as to stand upright at the tip of an extension portion 42 extending in parallel from the end portion on the one side in the width direction of the second flat portion 36 so as to be orthogonal to the extension portion 42. The contact portion 40 and the locking piece 41 constitute the tool engaging portion 34.
As a result, the belt tension adjusting device 25 is engaged with the contact portion 40 constituting the tool engaging portion 34 when the tensioner bracket 27 having the tool engaging portion 34 that engages with the rod-shaped tool 33 is formed. The piece 41 can be formed integrally with the tensioner bracket 27 and by simply bending the thin plate.
For this reason, the belt tension adjusting device 25 can simplify the structure of the tensioner bracket 27 and improve the manufacturability and assembling workability of the belt tension adjusting device 25.
As shown in FIG. 3 (B), the tensioner bracket 27 is configured such that the connecting surface portion 37 is offset parallel to the first flat surface portion 35 by the first step portion 38, and the connecting surface portion 37 is interposed via the first step portion 38. Thus, a pulley support surface 43 extending in parallel with the first flat surface portion 35 is formed. The connecting surface portion 37 is formed with a pulley mounting hole 44 penetrating from the pulley support surface 43 to the opposite surface, and a pulley mounting nut 45 whose center coincides with the pulley mounting hole 44 on the surface opposite to the pulley support surface 43. It is stuck. A pulley mounting bolt 28 inserted through the tensioner pulley 26 is screwed onto the pulley mounting nut 45 through the pulley mounting hole 44, so that the tensioner pulley 26 is supported on the pulley supporting surface 43 and is rotatable on the connecting surface portion 37. It is attached.
As a result, the belt tension adjusting device 25 does not extend the rotation shaft of the tensioner pulley 26 (in this embodiment, the pulley mounting bolt 28), but extends the center of the tensioner pulley 26 in the width direction (center of the belt groove). 18 can be adjusted to the center in the width direction (center of the belt width), and the manufacturability of the belt tension adjusting device 25 can be improved.
As shown in FIG. 3A, the tensioner bracket 27 is formed with a fixture hole 23 in the second flat portion 36 as an arc-shaped elongated hole having the same center as the swing shaft hole 30. The contour line of the tensioner bracket 27 is formed in a fan shape surrounding the fixture hole portion 32 and the swing shaft hole portion 30, and the contact portion 40 is disposed in the fan-shaped straight portion.
As a result, the belt tension adjusting device 25 can improve the manufacturability of the belt tension adjusting device 25 by reducing the size of the tensioner bracket 27 and can also be disposed in a place having a small peripheral space.
The tensioner bracket 27 has a protrusion 46 that contacts the peripheral surface of the rod-shaped tool 33 at the end of the connecting surface portion 37 on one side in the width direction (left side in the left-right direction in FIG. 3A). The protrusion 46 is in the middle of the rod-shaped tool 33 that is in contact with the contact portion 40 and the locking piece 41, and the protrusion 46 of the tool 33 with which the contact portion 40 and the locking piece 41 contact from the opposite side in the radial direction. One end of the connecting surface portion 37 in the width direction so as to be in contact with the peripheral surface of the tool 33 from the opposite side of the radial direction with respect to the extension portion 42 on the side orthogonal to the peripheral surface. Formed in the part.
As a result, the belt tension adjusting device 25 adjusts the tension of the belt 18 from the opposite side in the radial direction when the tension of the belt 18 is adjusted by the tool 33 engaged with the contact portion 40 and the locking piece 41. The abutting portion 40 and the locking piece 41 to be in contact, and the extension portion 42 and the protruding portion that are in contact with the peripheral surface of the tool 33 from the opposite side in the radial direction on the side orthogonal to the abutting portion 40 and the locking piece 41. 45, the tool 33 can be supported from four directions, and the adjustment work can be easily performed by reliably preventing the tool 33 from coming off.

この発明のベルト張力調整装置は、テンショナブラケットの構造を簡素化してベルト張力調整装置の製造性及び組付け作業性を向上できるものであり、車両に搭載される各種の内燃機関のベルト張力調整装置に適用することができる。   The belt tension adjusting device according to the present invention simplifies the structure of the tensioner bracket and can improve the manufacturability and assembly workability of the belt tension adjusting device. The belt tension adjusting device for various internal combustion engines mounted on a vehicle. Can be applied to.

実施例を示すベルト張力調整装置を備えた内燃機関の正面図である。It is a front view of the internal combustion engine provided with the belt tension adjusting device which shows an Example. 実施例を示すベルト張力調整装置の斜視図である。It is a perspective view of a belt tension adjusting device showing an example. 実施例を示し、（Ａ）はテンショナブラケットの正面図、（Ｂ）はＢ−Ｂ線によるテンショナブラケットの断面図である。An Example is shown, (A) is a front view of a tensioner bracket, (B) is sectional drawing of the tensioner bracket by the BB line.

符号の説明Explanation of symbols

１ 内燃機関
７ クランク軸
１０ クランクプーリ
１４ ウォータポンプ
１６ ポンププーリ
１８ ベルト
２５ ベルト張力調整装置
２６ テンショナプーリ
２７ テンショナブラケット
２８ プーリ取付ボルト
２９ 揺動ボルト
３０ 揺動軸用孔部
３１ 固定ボルト
３２ 固定具用孔部
３３ 工具
３４ 工具係合部
３５ 第１平面部
３６ 第２平面部
３７ 連絡面部
３８ 第１段差部
３９ 第２段差部
４０ 当接部
４１ 係止片
４６ 突起部
DESCRIPTION OF SYMBOLS 1 Internal combustion engine 7 Crankshaft 10 Crank pulley 14 Water pump 16 Pump pulley 18 Belt 25 Belt tension adjusting device 26 Tensioner pulley 27 Tensioner bracket 28 Pulley mounting bolt 29 Swing bolt 30 Swing shaft hole 31 Fixing bolt 32 Fixing hole Part 33 Tool 34 Tool engaging part 35 First plane part 36 Second plane part 37 Connection surface part 38 First step part 39 Second step part 40 Contact part 41 Locking piece 46 Projection part

Claims (3)

複数のプーリ間に動力を伝達するベルトを巻き掛け、このベルトに張力を与えるテンショナプーリをテンショナブラケットに取り付け、このテンショナブラケットに揺動軸を挿入する揺動軸用孔部と、固定具を挿入する固定具用孔部と、棒状の工具と係合する工具係合部とを設け、ベルト張力調整時に、前記テンショナブラケットを前記工具によって前記揺動軸の回りに揺動させるとともに前記固定具によって所定位置に固定するベルト張力調整装置において、前記テンショナブラケットを前記揺動軸用孔部が設けられる第１平面部と、前記固定具用孔部が設けられる第２平面部と、これら両者の間を連絡する連絡面部とを有する薄板で形成し、前記連絡面部に前記第１平面部または前記第２平面部の少なくとも一方と段差をなす段差部を形成し、この段差部の幅方向端部に前記棒状の工具と当接する当接部を形成する一方、この当接部と反対側から前記棒状の工具の周面に係止する係止片を前記テンショナブラケットの外周部に形成し、前記当接部と前記係止片とによって前記工具係合部を構成したことを特徴とするベルト張力調整装置。   Wrap a belt that transmits power between multiple pulleys, attach a tensioner pulley that applies tension to this belt to the tensioner bracket, insert the swinging shaft hole into this tensioner bracket, and a fixture. A fixing tool hole and a tool engaging part that engages with a rod-shaped tool, and when adjusting the belt tension, the tensioner bracket is swung around the swinging shaft by the tool and is fixed by the fixing tool. In the belt tension adjusting device for fixing at a predetermined position, the tensioner bracket is provided with a first flat surface portion provided with the rocking shaft hole portion, a second flat surface portion provided with the fixing device hole portion, and a gap between them. And forming a stepped portion that forms a step with at least one of the first planar portion or the second planar portion on the connecting surface portion. Then, a contact portion that contacts the rod-shaped tool is formed at an end in the width direction of the stepped portion, and a locking piece that is locked to the circumferential surface of the rod-shaped tool from the side opposite to the contact portion is A belt tension adjusting device formed on an outer peripheral portion of a tensioner bracket, wherein the contact portion and the locking piece constitute the tool engaging portion. 前記連絡面部に前記段差部を介して前記第１平面部と平行に延びるプーリ支持面を形成し、このプーリ支持面に前記テンショナプーリを支持させて前記連結面部に取り付けたことを特徴とする請求項１に記載のベルト張力調整装置。   A pulley support surface extending in parallel with the first flat surface portion via the stepped portion is formed on the communication surface portion, and the tensioner pulley is supported on the pulley support surface and attached to the connecting surface portion. Item 2. The belt tension adjusting device according to Item 1. 前記固定具用孔部を前記揺動軸用孔部と同一中心を有する円弧状の長孔に形成し、前記テンショナブラケットの輪郭線を前記固定用孔部と前記揺動軸用孔部を囲む扇形に形成し、前記当接部を扇形の直線部分に配設したことを特徴とする請求項１に記載のベルト張力調整装置。   The fixing tool hole is formed as an arc-shaped elongated hole having the same center as the swing shaft hole, and the contour line of the tensioner bracket surrounds the fixing hole and the swing shaft hole. 2. The belt tension adjusting device according to claim 1, wherein the belt tension adjusting device is formed in a sector shape, and the abutting portion is disposed in a linear portion of the sector shape.
JP2006241257A 2006-09-06 2006-09-06 Belt tension adjuster Expired - Fee Related JP4730556B2 (en)

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