JP2006266381A - Pulley bracket and mounting structure and mounting method for pulley bracket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attach a mounting part of a pulley bracket to an internal combustion engine at a proper mounting angle to prevent occurrence of abnormal sound and partial wear of a belt. <P>SOLUTION: This pulley bracket 24 is provided with a supporting shaft part 36 for supporting an idler pulley 22 around which the endless transmission belt 19 is wound and the mounting part 37 having a plurality of through holes extending along a face crossing an axial line L1 of the supporting shaft part 36 substantially orthogonally. When mounting the pulley bracket 24, the mounting part 37 is attached to a face on which it is attached and which is substantially parallel with the axial line L1 of the internal combustion engine 11 by a bolt 34 or a stud bolt 33 (a nut 35) inserted into the through holes. A correction face 49 crossing the axial line L1 substantially orthogonally is provided on a front face of a cylinder head 15, and a mounting angle correction part 53 for correcting a mounting angle of the mounting part 37 for the internal combustion engine 11 by coming into contact with the correction face 49 is provided on the pulley bracket 24 when mounting the mounting part 37. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pulley bracket that supports a pulley around which an endless transmission belt is wound, an attachment structure for attaching the pulley bracket to an internal combustion engine, and an attachment method.

  For example, various auxiliary machines are attached to an internal combustion engine for automobiles, and pulleys are attached to the rotating shafts and crankshafts of these auxiliary machines, and endless transmission belts are wound around these pulleys. ing. The rotation of the crankshaft is transmitted to each auxiliary machine via the pulley and the transmission belt, and the auxiliary machine is driven. Further, the internal combustion engine is provided with an idler pulley, a tensioner and the like. The idler pulley guides the transmission belt to ensure a sufficient wrapping angle of the transmission belt with respect to the pulley to ensure transmission of the driving force, and the tensioner adjusts the tension of the transmission belt.

These idler pulleys and tensioner pulleys are attached to the internal combustion engine by pulley brackets. The pulley bracket includes a support shaft portion that supports the pulley, and an attachment portion that has a plurality of through holes extending along a surface substantially orthogonal to the axis of the support shaft portion. The cylinder block of the internal combustion engine is provided with a fastening hole that opens on the side surface. Then, the pulley bracket is fastened to the cylinder block by screwing the bolt into the fastening hole through the corresponding through hole. Further, the pulley bracket may be fastened to the cylinder block by a stud bolt that is planted on the side surface of the cylinder block and is inserted through the through hole, and a nut that is screwed onto the stud bolt. As an attachment structure of such a pulley bracket to an internal combustion engine, there is one described in Patent Document 1, for example.
JP 2003-148161 A (page 3, FIG. 3, FIG. 4)

  By the way, in the pulley bracket (including the one described in Patent Document 1), the inner diameter of the through hole is usually set larger than the inner diameter of the fastening hole and the diameter of the bolt or stud bolt. With this setting, when installing the pulley bracket, the plurality of through holes can be surely matched with the corresponding fastening holes and stud bolts, and the work of screwing the bolts into the fastening holes through the through holes is facilitated. . In addition, the operation of inserting the stud bolt into the through hole is facilitated. On the other hand, the above setting may cause a pulley misalignment. That is, since the through hole has a larger diameter than the bolt or the stud bolt, the mounting portion can move relative to the bolt before the bolt or the nut is completely tightened. On the other hand, the through hole extends along a plane substantially orthogonal to the axis of the support shaft portion. Therefore, when the mounting portion moves with respect to the bolt or the stud bolt, the angle (mounting angle) of the mounting portion with respect to the internal combustion engine changes, and accordingly, the support shaft portion and the inclination of the pulley on the support shaft portion also change. Therefore, there is a risk that the mounting part is fastened to the cylinder block by tightening the bolt or nut with the mounting angle deviating from an appropriate value. In that case, the axis of the support shaft part and the support shaft part The pulley axis is not parallel to the axes of the other pulleys. As a result, the transmission belt is wound around the pulley in an inclined state, and noise due to friction between the transmission belt and the pulley is generated, or the transmission belt is likely to be unevenly worn.

  The present invention has been made in view of such circumstances, and its purpose is to attach the attachment portion to the internal combustion engine at an appropriate attachment angle, and to suppress the generation of abnormal noise and uneven wear of the belt. It is an object to provide a pulley bracket, a pulley bracket mounting structure, and a mounting method.

In the following, means for achieving the above object and its effects are described.
In invention of Claim 1, it has a support shaft part which supports a pulley around which an endless power transmission belt is wound, and a plurality of through holes extending along a plane substantially perpendicular to the axis of the support shaft part, In a pulley bracket including a mounting portion fastened to a mounting surface substantially parallel to the axis of the internal combustion engine by fastening means including a bolt inserted into the through-hole, the internal combustion engine is substantially orthogonal to the axis. It is further assumed that an attachment angle correction unit that corrects an attachment angle of the attachment part with respect to the internal combustion engine by contacting the provided correction surface.

  When the pulley bracket having the above configuration is attached to the internal combustion engine, the bolt of the fastening means is inserted into the through hole of the attachment portion. At this time, if the inner diameter of the through hole is set larger than the diameter of the bolt, the attachment portion can move relative to the bolt. Here, the through hole extends along a plane substantially orthogonal to the axis of the support shaft portion. Therefore, when the mounting portion moves relative to the bolt, the mounting angle of the mounting portion with respect to the internal combustion engine changes, and accordingly, the support shaft portion and the inclination of the pulley on the support shaft portion also change.

  In this regard, according to the first aspect of the present invention, the pulley bracket is provided with the mounting angle correction portion. The attachment angle correction portion is brought into contact with a correction surface substantially orthogonal to the axis of the support shaft portion in the internal combustion engine, whereby the attachment angle of the attachment portion with respect to the internal combustion engine is corrected. By this correction, it is possible to make the axis of the support shaft, and thus the axis of the pulley on the support shaft, parallel or close to the axis of the other pulleys of the internal combustion engine. And when fastening by a fastening means is performed in the state in which the said correction | amendment was performed, an attaching part will be attached with an appropriate attachment angle with respect to an internal combustion engine. As a result, a phenomenon in which the transmission belt is wound around the pulley in an inclined state is less likely to occur, and abnormal noise due to friction between the transmission belt and the pulley and uneven wear of the transmission belt are suppressed.

  Here, “substantially orthogonal” or “substantially parallel” to the axis of the support shaft means that it does not necessarily need to be completely orthogonal or parallel. This means that the parallelism of the axis of the pulley on the support shaft with respect to the axis of the other pulley may be deviated from completely orthogonal or parallel if it falls within an allowable range for the required parallelism. The same applies to the inventions described in other claims.

  According to a second aspect of the present invention, in the first aspect of the invention, the mounting angle correction portion has an auxiliary through hole into which an auxiliary bolt for fastening the mounting angle correction portion to the internal combustion engine is inserted. Then.

  According to the pulley bracket having the above-described configuration, when the bolt of the fastening means is inserted into the through hole of the attachment portion, the auxiliary bolt inserted into the auxiliary through hole of the attachment angle correction portion is tightened, so that the attachment angle The correction unit is brought close to the internal combustion engine and is brought into close contact with the correction surface. Due to this close contact, the mounting angle of the mounting portion with respect to the internal combustion engine is appropriately corrected, and the above-described effect of the first aspect can be reliably obtained.

  According to a third aspect of the present invention, there is provided a support shaft portion for supporting a pulley around which an endless transmission belt is wound, and a mounting portion having a plurality of through holes extending along a plane substantially perpendicular to the axis of the support shaft portion. In the pulley bracket mounting structure, the mounting portion is mounted on a mounting surface substantially parallel to the axis of the internal combustion engine by fastening means including a bolt inserted into the through hole. The internal combustion engine is provided with a correction surface substantially orthogonal to the axis, and the pulley bracket is attached to the internal combustion engine by contacting the correction surface when the attachment portion is attached by the fastening means. Assume that an attachment angle correction unit for correcting the angle is provided.

  In the mounting structure having the above configuration, when the pulley bracket is mounted to the internal combustion engine, the bolt of the fastening means is inserted into the through hole of the mounting portion. At this time, if the inner diameter of the through hole is set larger than the diameter of the bolt, the attachment portion can move relative to the bolt. Here, the through hole extends along a plane substantially orthogonal to the axis of the support shaft portion. Therefore, when the mounting portion moves relative to the bolt, the mounting angle of the mounting portion with respect to the internal combustion engine changes, and accordingly, the support shaft portion and the inclination of the pulley on the support shaft portion also change.

  In this regard, in the invention described in claim 3, the internal combustion engine is provided with a correction surface substantially orthogonal to the axis of the support shaft portion, while the pulley bracket is provided with an attachment angle correction portion. The attachment angle correction portion and the correction surface are brought into contact with each other, whereby the attachment angle of the attachment portion with respect to the internal combustion engine is corrected. By this correction, the axis of the support shaft, and thus the axis of the pulley on the support shaft, is parallel to or close to the axis of the other pulleys of the internal combustion engine. And if fastening by a fastening means is performed in this state, an attaching part will be attached with an appropriate attachment angle with respect to an internal combustion engine. As a result, a phenomenon in which the transmission belt is wound around the pulley in an inclined state is less likely to occur, and generation of noise due to friction between the transmission belt and the pulley and uneven wear of the transmission belt are suppressed.

According to a fourth aspect of the present invention, in the third aspect of the present invention, auxiliary fastening means for fastening the attachment angle correcting portion to the internal combustion engine is further provided.
According to the mounting structure having the above configuration, the mounting angle correcting portion of the pulley bracket is fastened to the internal combustion engine by the auxiliary fastening means in a state where the bolt of the fastening means is inserted into the through-hole of the mounting portion. The angle correction unit is in close contact with the correction surface of the internal combustion engine. By this close contact, the mounting angle of the mounting portion with respect to the internal combustion engine is properly corrected, and the effect of the above-described third aspect can be reliably obtained.

  According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the auxiliary fastening means is inserted into an auxiliary through hole provided in the mounting angle correction portion and opens to the correction surface. It is assumed that an auxiliary bolt to be screwed is provided.

  According to the mounting structure having the above-described configuration, the auxiliary bolt is inserted into the auxiliary through-hole of the mounting angle correction portion and opened to the correction surface of the internal combustion engine in a state where the bolt of the fastening means is inserted into the through-hole of the mounting portion. Screwed into the auxiliary fastening hole. When the auxiliary bolt is tightened, the mounting angle correction portion is brought close to the internal combustion engine and is in close contact with the correction surface.

  According to a sixth aspect of the invention, in the invention according to any one of the third to fifth aspects, the attached surface is formed on any of a cylinder block, a cylinder head, and a lower case in the internal combustion engine. Suppose that

  Among various parts and members constituting the internal combustion engine, the cylinder block, the cylinder head, and the lower case are all higher in rigidity than the other components and members. Therefore, the mounting rigidity of the pulley bracket can be increased by forming a mounting surface on any of these cylinder block, cylinder head, and lower case, and mounting the mounting portion thereon. Therefore, even if a bending load acts on the support shaft portion that supports the pulley by the tension of the transmission belt, the support shaft portion can be prevented from being inclined.

  According to a seventh aspect of the present invention, in the invention according to any one of the third to sixth aspects, the correction surface is a surface of any one of a cylinder block, a cylinder head, a lower case, and a chain case in the internal combustion engine. Suppose that it was formed by processing.

  As described above, by machining any of the cylinder block, cylinder head, lower case, and chain case among the various parts and members that constitute the internal combustion engine, the correction surface has an accuracy substantially orthogonal to the axis of the support shaft portion. It can be a high surface. Therefore, by bringing the mounting angle correction portion into contact with this correction surface, the axis of the support shaft, and thus the axis of the pulley on the support shaft, is parallel to or close to the axis of the other pulley with high accuracy. can do.

  According to an eighth aspect of the present invention, there is provided a mounting portion having a support shaft portion that supports a pulley around which an endless transmission belt is wound, and a plurality of through holes extending along a plane substantially perpendicular to the axis of the support shaft portion. In the pulley bracket mounting method, the mounting portion is mounted on a mounting surface substantially parallel to the axis of the internal combustion engine by fastening means including a bolt inserted through the through hole. The attachment angle correction portion provided on the pulley bracket is brought into contact with a correction surface substantially orthogonal to the axis of the internal combustion engine, and fastening by the fastening means is performed in this contact state, whereby the attachment portion is attached to the internal combustion engine. It is assumed that the attachment portion is attached to the internal combustion engine with the angle corrected.

  According to the attachment method, the bolt is inserted into each of the plurality of through holes provided in the attachment portion. At this time, if the inner diameter of the through hole is larger than the diameter of the bolt and a backlash is set between them, the mounting portion can move relative to the bolt. Here, the through hole extends along a plane substantially orthogonal to the axis of the support shaft portion. Therefore, when the mounting portion moves relative to the bolt, the mounting angle of the mounting portion with respect to the internal combustion engine changes, and accordingly, the support shaft portion and the inclination of the pulley on the support shaft portion also change.

  In this regard, in the invention described in claim 8, the mounting angle correction portion provided on the pulley bracket is brought into contact with the correction surface substantially orthogonal to the axis of the internal combustion engine, and the mounting angle of the mounting portion with respect to the internal combustion engine is corrected. The By this correction, it is possible to make the axis of the support shaft, and thus the axis of the pulley on the support shaft, parallel or close to the axis of the other pulley. And when fastening by the fastening means containing the said volt | bolt is performed, an attaching part will be attached with an appropriate attachment angle with respect to an internal combustion engine. As a result, a phenomenon in which the transmission belt is wound around the pulley in an inclined state is less likely to occur, and generation of noise due to friction between the transmission belt and the pulley and uneven wear of the transmission belt are suppressed.

  According to a ninth aspect of the invention, there is provided the auxiliary fastening means according to the eighth aspect of the invention, wherein the bolt of the fastening means is inserted into the through hole of the mounting portion prior to fastening by the fastening means. It is assumed that the attachment angle correction part is fastened to the internal combustion engine.

  According to the above mounting method, the mounting angle correcting portion is fastened to the internal combustion engine by the auxiliary fastening means in a state where the bolt of the fastening means is inserted through the through hole of the mounting portion. By this fastening, the attachment angle correction part is brought close to the internal combustion engine and is brought into close contact with the correction surface, the attachment angle of the attachment part with respect to the internal combustion engine is appropriately corrected, and the effect of the above-described claim 8 can be reliably obtained.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 5 shows a schematic configuration of the internal combustion engine 11 mounted on the vehicle. The internal combustion engine 11 includes a cylinder block 12 having a plurality of cylinders. In the cylinder block 12, a plurality of cylinders are arranged in a row in the left-right direction in FIG. A crankshaft (not shown) that is an output shaft of the internal combustion engine 11 is disposed below the cylinder block 12 along the cylinder arrangement direction. The crankshaft is rotatably supported by a lower case 13 fastened to the bottom surface of the cylinder block 12. Further, an oil pan 14 is attached to the lower side of the lower case 13.

  On the other hand, a cylinder head 15 having a valve operating mechanism is attached to the upper side of the cylinder block 12. The valve operating mechanism includes an intake cam shaft and an exhaust cam shaft that are arranged so as to extend in the cylinder arrangement direction and are rotatably supported on the cylinder head 15. A head cover 16 that covers the valve operating mechanism is attached to the upper side of the cylinder head 15.

  A sprocket is attached to one end of each of the crankshaft and the intake / exhaust camshaft, and a timing chain is stretched over these sprockets. When the crankshaft is rotated, the rotation is transmitted to the intake / exhaust camshaft via the sprocket and the timing chain. Further, in the cylinder head 15, the cylinder block 12, and the lower case 13, a chain case 17 that covers the timing chain is attached to the surface on the sprocket side. The cylinder block 12, cylinder head 15, lower case 13 and chain case 17 described above are manufactured by a casting method, for example, a die casting method using an aluminum alloy as a material.

  In addition, in order to distinguish each part of the surface of the internal combustion engine 11, the surface (left side in FIG. 5) on which the sprocket and the timing chain are disposed is referred to as a “front surface”. Further, the direction on the sprocket and timing chain side (left side in FIG. 5) with respect to the internal combustion engine 11 is referred to as “front”.

  Various auxiliary machines such as an air conditioner compressor, a power steering pump, an engine cooling water pump, and an alternator are attached to the front surfaces of the cylinder head 15, the cylinder block 12, the chain case 17, and the like. Pulleys are mounted on the rotating shafts and crankshafts of the auxiliary machines, respectively, and endless transmission belts are wound around these pulleys. The rotation of the crankshaft is transmitted to each auxiliary machine via the pulley and the transmission belt, and the auxiliary machine is driven. 1 and 2 show a water pump pulley 18 and a transmission belt 19.

  The internal combustion engine 11 is provided with idler pulleys 21 and 22 and an auto tensioner 23. The idler pulleys 21 and 22 are for guiding the transmission belt 19 in order to ensure a sufficient winding angle of the transmission belt 19 with respect to the various pulleys so as to ensure transmission of driving force. The auto tensioner 23 is for adjusting the tension of the transmission belt 19. The auto tensioner 23 is swingably supported by the internal combustion engine 11 and is urged in a direction in which the transmission belt 19 is tensioned, and a pulley that is supported by the swing arm and presses the transmission belt 19. Is provided.

  A pulley bracket 24 is attached to the internal combustion engine 11, and the idler pulley 22 is supported by the pulley bracket 24. Next, the configuration of the pulley bracket 24 and the structure and method for attaching the pulley bracket 24 to the internal combustion engine 11 will be described.

  In the internal combustion engine 11, the parts / members to which the pulley bracket 24 is attached are the cylinder blocks 12 having high rigidity among the constituent parts / members of the internal combustion engine 11, and more specifically, as shown in FIG. A plurality (three in this case) of mounting bosses 26, 27, and 28 are provided on the side surface 25 of the block 12. As shown in FIG. 4, a mounting surface 31 that is substantially orthogonal to the front surface 29 of the cylinder block 12 is formed at the tip of each of the mounting bosses 26 to 28. Each attached surface 31 is substantially parallel to an axis L1 of a support shaft portion 36 to be described later. Further, each mounting boss 26 to 28 is provided with a fastening hole 32 that opens in the mounted surface 31. On the inner peripheral surface of these fastening holes 32, a female screw to which the stud bolt 33 or the bolt 34 is screwed is formed. Stud bolts 33 are implanted in the fastening holes 32 of some (two in this case) mounting bosses 27 and 28.

  On the other hand, the pulley bracket 24 includes a support shaft portion 36 and an attachment portion 37 as shown in FIGS. 3 and 4. The support shaft portion 36 has a cylindrical shape, and a bearing 38 is mounted on the outer periphery thereof. The pulley bracket 24 is provided with a fastening hole 39 that opens at the front surface of the support shaft portion 36. The inner ring of the bearing 38 is locked to the support shaft portion 36 so as not to fall off by the head portion of the bolt 41 screwed into the fastening hole 39. An idler pulley 22 is mounted on the outer ring of the bearing 38. As described above, the idler pulley 22 is rotatably supported by the support shaft portion 36 by the bearing 38.

  The attachment portion 37 is integrally provided on the rear side of the support shaft portion 36, and has attachment bosses 42, 43, 44 at a plurality (three) of locations corresponding to the fastening holes 32 of the cylinder block 12. . One end surface (the lower side in FIG. 4) of each of the mounting bosses 42 to 44 serves as a mounting surface 45 that is brought into close contact with the mounted surface 31 of the mounting bosses 26 to 28 when the pulley bracket 24 is mounted to the cylinder block 12. Each mounting surface 45 is formed substantially parallel to the axis L <b> 1 of the support shaft portion 36. The attachment portion 37 is provided with through holes 46 that extend along a surface substantially orthogonal to the axis L1 of the support shaft portion 36 and open at both end surfaces of the attachment bosses 42 to 44. Each through hole 46 is formed such that its inner diameter is larger than the inner diameter of the fastening hole 32 and the diameters of the stud bolt 33 and the bolt 34. This is because, in order to make sure that the plurality of through holes 46 are aligned with the corresponding fastening holes 32 and stud bolts 33, and to facilitate the insertion of the bolts 34 and stud bolts 33 into the through holes 46. It is. The mounting bosses 43 and 44 having the through holes 46 through which the stud bolts 33 are inserted are formed shorter than the protruding length of the stud bolts 33 from the mounting bosses 27 and 28.

  When mounting the mounting portion 37 to the cylinder block 12, a pair of stud bolts 33 planted in the cylinder block 12 are inserted through the corresponding through holes 46. The mounting surfaces 45 of the mounting bosses 42 to 44 on the mounting portion 37 side are brought into contact with the mounted surfaces 31 of the mounting bosses 26 to 28 on the cylinder block 12 side, and the nuts 35 are screwed onto the stud bolts 33. On the other hand, a bolt 34 is inserted into the upper through-hole 46, and its tip is screwed into the fastening hole 32 on the mounting boss 26 side. When the nuts 35 and the bolts 34 are screwed in, the mounting surfaces 45 of the mounting bosses 42 to 44 are brought into pressure contact with the mounted surfaces 31 of the corresponding mounting bosses 26 to 28 in close contact with each other. The part 37 is fastened to the cylinder block 12. In the present embodiment, the bolt 34, the stud bolt 33, and the nut 35 constitute fastening means. Further, as described above, since the mounted surface 31 is formed on the cylinder block 12 having high rigidity and the mounting portion 37 is fastened to the cylinder block 12 through the mounted surface 31, the pulley bracket 24. The mounting rigidity is improved.

  By the way, since the inner diameter of the through hole 46 is set larger than the inner diameter of the fastening hole 32 and the diameter of the stud bolt 33 and the bolt 34 as described above, the state before the bolt 34 and the nut 35 are completely tightened. Then, there is play between the inner wall of the through hole 46 and the shaft portion of the bolt 34, or between the inner wall of the through hole 46 and the stud bolt 33. Due to this backlash, the mounting portion 37 can move with respect to the stud bolt 33 and the bolt 34. On the other hand, each through hole 46 extends along a plane substantially orthogonal to the axis L <b> 1 of the support shaft portion 36. Accordingly, when the mounting portion 37 moves with respect to the bolt 34 and the stud bolt 33, the angle (mounting angle) of the mounting portion 37 with respect to the cylinder block 12 changes, and accordingly, the inclination of the support shaft portion 36 and the idler pulley 22 also changes.

  Here, for example, as shown in FIG. 6B, a straight line L2 passing through both center lines of the adjacent fastening holes 32 (stud bolts 33 and bolts 34) and a straight line passing through both center lines of the adjacent through holes 46 are provided. An angle formed by L3 is defined as an attachment angle α. If the inner diameter of the through hole 46 and the inner diameter of the fastening hole 32 (the diameter of the bolt 34, etc.) are the same, both the straight lines L2 and L3 match and the mounting angle α becomes “0”. However, in this embodiment, since the inner diameter of the through hole 46 is set larger than the inner diameter of the fastening hole 32 (the diameter of the bolt 34, etc.), the straight lines L2 and L3 do not match, and the mounting angle α is “ It may happen that it is not “0”. When the bolt 34 and the nut 35 are tightened in this state, the axis L1 of the support shaft portion 36, and hence the axis of the idler pulley 22 are not parallel to the axis L4 of the other pulleys.

  Therefore, in the present embodiment, this problem is addressed by providing means for correcting the mounting angle α of the mounting portion 37. More specifically, as shown in FIGS. 3 and 5, a correction boss 48 is integrally provided on the front surface 47 of the cylinder head 15. A correction surface 49 that is substantially orthogonal to the axis L1 of the support shaft portion 36 is formed at the front end of the correction boss 48 by a processing method such as cutting or grinding. The correction boss 48 is provided with auxiliary fastening holes 51 that are open on both the front and rear surfaces thereof substantially parallel to the axis L1. A female screw into which the auxiliary bolt 52 is screwed is formed on the inner peripheral surface of the auxiliary fastening hole 51. The auxiliary fastening hole 51 may be changed to a configuration that opens only on the correction surface 49 of the correction boss 48. Moreover, you may change into the structure which implants a stud bolt in the auxiliary | assistant fastening hole 51. FIG.

  On the other hand, in the pulley bracket 24, an attachment angle correction part 53 is integrally provided on the upper part of the attachment part 37. The rear surface of the mounting angle correction portion 53 is formed so as to be substantially orthogonal to the axis L1 of the support shaft portion 36. The attachment angle correction portion 53 is provided with auxiliary through holes 54 that extend along the axis L <b> 1 and open on both front and rear surfaces of the attachment angle correction portion 53. And the attachment angle (alpha) with respect to the cylinder block 12 of the attachment part 37 in the pulley bracket 24 is correct | amended by making the rear surface of the attachment angle correction part 53 contact the correction surface 49. FIG. In the present embodiment, the auxiliary bolt 52, the auxiliary through hole 54, and the auxiliary fastening hole 51 described above constitute auxiliary fastening means for fastening the attachment angle correcting portion 53 to the internal combustion engine 11 (cylinder head 15).

  In the present embodiment configured as described above, when the pulley bracket 24 is attached to the internal combustion engine 11, the support shaft portion 36 is positioned on the front side of the attachment portion 37, and the attachment angle correction portion 53 is above the attachment portion 37. The posture of the pulley bracket 24 is adjusted so as to be positioned at the position. The pulley bracket 24 is brought closer to the side surface 25 of the cylinder block 12 from the side of the front end portion of the cylinder block 12. The position of the mounting portion 37 is adjusted so that the pair of through holes 46 provided in the lower portion of the mounting portion 37 matches the tips of the mounting bosses 27 and 28 of the cylinder block 12. When the two through holes 46 are aligned with the tips of the corresponding stud bolts 33, the pulley bracket 24 is further brought closer to the side surface 25 of the cylinder block 12, and both stud bolts 33 are inserted into the corresponding through holes 46. At this time, since the inner diameter of the through hole 46 is set larger than the diameter of the stud bolt 33, the insertion work can be easily performed. When both stud bolts 33 enter the through hole 46, they function as guides thereafter.

  When the pulley bracket 24 approaches the side surface 25 of the cylinder head 15, the attachment angle correction portion 53 approaches the correction boss 48 accordingly. The pulley bracket 24 is brought close to the cylinder block 12 and the cylinder head 15 while adjusting the posture of the pulley bracket 24 so that the mounting angle correcting portion 53 passes in front of the correcting boss 48. When the mounting bosses 42 to 44 of the pulley bracket 24 are brought into contact with or close to the mounted surfaces 31 of the mounting bosses 26 to 28 in the cylinder block 12, the through hole 46 of the upper mounting boss 42 is a fastening hole of the mounting boss 26. 32, the auxiliary through hole 54 of the mounting angle correction portion 53 matches the auxiliary fastening hole 51 of the correction boss 48. Moreover, the front-end | tip part of both stud bolts 33 protrudes from the corresponding attachment boss | hub 43,44 to the side. A nut 35 is screwed into the protruding portion of the stud bolt 33. The bolt 34 is inserted into the through hole 46 on the upper side of the attachment portion 37, and the tip end portion is screwed into the fastening hole 32 of the attachment boss 26. Further, the auxiliary bolt 52 is inserted from the front into the auxiliary through hole 54 of the mounting angle correction portion 53, and the tip of the auxiliary bolt 52 is screwed into the auxiliary fastening hole 51 of the correction boss 48. The auxiliary bolt 52 is tightened so that the rear surface of the mounting angle correction portion 53 is in close contact with the correction surface 49 of the correction boss 48. Due to this close contact, as shown in FIG. 6A, the mounting angle α of the mounting portion 37 with respect to the cylinder block 12 is corrected to become “0” or a state close thereto. The straight lines L2 and L3 coincide with each other so that the axis L1 of the support shaft 36 (idler pulley 22) matches or is close to the axis L4 of another pulley. Further, by tightening both the nuts 35 and the bolts 34, the mounting surfaces 45 of the mounting bosses 42 to 44 are brought into close contact with the mounted surfaces 31 of the corresponding mounting bosses 26 to 28, and the mounting portion 37 is fastened to the cylinder block 12. .

According to the embodiment described in detail above, the following effects can be obtained.
(1) A correction boss 48 is provided on the front surface 47 of the internal combustion engine 11 (cylinder head 15), and a correction surface 49 substantially orthogonal to the axis L1 of the support shaft portion 36 is provided at the front end thereof. A correction unit 53 is provided. Therefore, when the mounting portion 37 is fastened to the cylinder block 12, the mounting angle α of the mounting portion 37 with respect to the cylinder block 12 is brought into contact with the correction surface 49 as shown in FIG. And the axis of the idler pulley 22 (the axis L1 of the support shaft 36) can be parallel to or close to the axis L4 of the other pulley. The phenomenon that the transmission belt 19 is wound around the idler pulley 22 in an inclined state is less likely to occur, and generation of noise due to friction between the transmission belt 19 and the idler pulley 22 and uneven wear of the transmission belt 19 are suppressed. it can.

  (2) As shown in FIG. 3, the auxiliary fastening hole 51 is provided in the correction boss 48, and the auxiliary through hole 54 is provided in the attachment angle correction portion 53. Therefore, the stud bolt 33 and the bolt 34 are inserted into the through hole 46 of the mounting portion 37 and the auxiliary bolt 52 is inserted into the auxiliary through hole 54 before the bolt 34 and the nut 35 are tightened. By screwing in, the rear surface of the mounting angle correction portion 53 can be brought into close contact with the correction surface 49. This close contact makes it possible to reliably correct the mounting angle α of the mounting portion 37 with respect to the internal combustion engine 11 (cylinder block 12), and the above-described effect (1) can be reliably obtained.

  (3) The mounting bosses 26 to 28 are integrally provided on the highly rigid cylinder block 12 among the various parts and members constituting the internal combustion engine 11, and the mounted surface 31 is formed at the front ends of these mounting bosses 26 to 28. Yes. Therefore, the mounting rigidity of the pulley bracket 24 can be increased by fastening the mounting portion 37 of the pulley bracket 24 to the mounted surface 31. Therefore, even if a bending load is applied to the support shaft portion 36 via the idler pulley 22 due to the tension of the transmission belt 19, the support shaft portion 36 can be prevented from being inclined due to the above-described improvement in rigidity.

  (4) The correction boss 48 is integrally provided on the cylinder head 15 among the various components and members constituting the internal combustion engine 11, and the correction surface 49 is formed by performing processing such as cutting and grinding on the front end. Therefore, the correction surface 49 can be a highly accurate surface substantially orthogonal to the axis L1 of the support shaft portion 36. Therefore, by bringing the mounting angle correction portion 53 into contact with the correction surface 49, the axis L1 of the support shaft portion 36 (idler pulley 22) is parallel to or close to the axis L4 of the other pulley with high accuracy. be able to.

Note that the present invention can be embodied in another embodiment described below.
The attachment surface 31 to which the attachment portion 37 of the pulley bracket 24 is attached may be formed in a part / member different from the cylinder block 12 in the internal combustion engine 11. In this case, it is desirable to form the mounting surface 31 on various parts and members constituting the internal combustion engine 11, particularly those having high rigidity, for example, the cylinder head 15 and the lower case 13. When the attachment surface 31 is formed on these parts / members, an effect similar to that of the above-described embodiment formed on the cylinder block 12, that is, an effect of increasing the attachment rigidity of the pulley bracket 24 to the internal combustion engine 11 can be obtained.

  The correction surface 49 with which the mounting angle correction part 53 is contacted may be formed in a component / member different from the cylinder head 15 in the internal combustion engine 11. In this case, it is desirable to form the correction surface 49 on any of the cylinder block 12, the lower case 13, and the chain case 17 among the various parts and members constituting the internal combustion engine 11 by machining. When the correction surface 49 is formed by these processes, the same effect as that of the above-described embodiment formed on the cylinder head 15, that is, the effect that the correction surface 49 is a highly accurate surface substantially orthogonal to the axis L <b> 1 of the support shaft portion 36. Is obtained.

  The auxiliary fastening hole 51, the auxiliary bolt 52, and the auxiliary through hole 54 may be omitted. In this case, the attachment angle α can be corrected by pressing the rear surface of the attachment angle correction portion 53 against the correction surface 49 of the correction boss 48. In this state, the attachment portion 37 is fastened to the attachment surface 31 of the internal combustion engine 11.

Instead of fastening with the auxiliary bolt 52, a configuration may be adopted in which the attachment angle correction part 53 and the correction boss 48 are sandwiched so that the rear surface of the attachment angle correction part 53 is in close contact with the correction surface 49.
-This invention is applicable to the internal combustion engine 11 of a different structure from the said embodiment. Examples of such internal combustion engines include those in which the lower case 13 is not used and the crankshaft is supported by a bearing cap, and those in which the chain case 17 is not used.

-You may change the fastening location with respect to the internal combustion engine 11 of the attaching part 37 in the pulley bracket 24 to two places or four places or more.
Moreover, you may change the structure (parts only of the volt | bolt 34 or the combination of the stud volt | bolt 33 and the nut 35) used for fastening in each fastening location to a thing different from the said embodiment.

  The present invention can be applied to a pulley bracket that supports the pulley of the auto tensioner 23 in addition to the idler pulley 22.

The partial perspective view which looked at the pulley bracket and its vicinity from diagonally forward upper direction of the internal combustion engine about one Embodiment which actualized this invention. The partial perspective view which looked at the pulley bracket and its vicinity from diagonally back upper direction of the internal combustion engine. The side view which shows an idler pulley and fracture | ruptures and shows a part of pulley bracket and the correction | amendment boss | hub. 4-4 sectional drawing in FIG. 1 is a schematic configuration diagram of an internal combustion engine. (A), (B) is explanatory drawing which compares and shows the effect | action of the attachment angle correction | amendment part in a pulley bracket.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Internal combustion engine, 12 ... Cylinder block, 13 ... Lower case, 15 ... Cylinder head, 17 ... Chain case, 19 ... Transmission belt, 21, 22 ... Idler pulley, 24 ... Pulley bracket, 31 ... Installation surface, 33 ... Stud Bolt (constituting part of the fastening means) 34 ... Bolt (constituting part of the fastening means) 35 ... Nut (constituting part of the fastening means) 36 ... Support shaft part 37 ... Installation part 46 ... Through hole 49 ... Correction surface 51 ... Auxiliary fastening hole (a part of auxiliary fastening means) 52 ... Auxiliary bolt (a part of auxiliary fastening means) 53 ... Attaching angle correction part 54 ... Auxiliary penetration Hole (constituting a part of auxiliary fastening means), L1, L4... Axis, α.

Claims (9)

A support shaft that supports a pulley around which an endless transmission belt is wound;
A fastening surface having a plurality of through-holes extending along a surface substantially orthogonal to the axis of the support shaft portion and including a bolt inserted into the through-hole is attached to a mounting surface substantially parallel to the axis of the internal combustion engine. In a pulley bracket comprising a fastening portion to be fastened,
A pulley bracket, further comprising an attachment angle correction portion that corrects an attachment angle of the attachment portion with respect to the internal combustion engine by contacting a correction surface provided in the internal combustion engine so as to be substantially orthogonal to the axis. 2. The pulley bracket according to claim 1, wherein the attachment angle correction portion has an auxiliary through hole into which an auxiliary bolt for fastening the attachment angle correction portion to the internal combustion engine is inserted. A support shaft that supports a pulley around which an endless transmission belt is wound;
A pulley bracket having a plurality of through-holes extending along a plane substantially orthogonal to the axis of the support shaft portion, the fastening portion including the bolt inserted into the through-hole by the fastening means. In the pulley bracket mounting structure that is mounted on the mounted surface substantially parallel to the axis of the engine,
The internal combustion engine is provided with a correction surface substantially orthogonal to the axis, and the pulley bracket is attached to the internal combustion engine by contacting the correction surface when the attachment portion is attached by the fastening means. A pulley bracket mounting structure comprising a mounting angle correcting portion for correcting an angle. The pulley bracket mounting structure according to claim 3, further comprising auxiliary fastening means for fastening the mounting angle correction portion to the internal combustion engine. 5. The pulley bracket according to claim 4, wherein the auxiliary fastening means includes an auxiliary bolt that is inserted into an auxiliary through hole provided in the attachment angle correction portion and is screwed into an auxiliary fastening hole that opens in the correction surface. Mounting structure. The pulley bracket mounting structure according to any one of claims 3 to 5, wherein the mounted surface is formed on any of a cylinder block, a cylinder head, and a lower case in the internal combustion engine. The pulley bracket according to any one of claims 3 to 6, wherein the correction surface is formed by processing a surface of any one of a cylinder block, a cylinder head, a lower case, and a chain case in the internal combustion engine. Mounting structure. A support shaft that supports a pulley around which an endless transmission belt is wound;
A pulley bracket having a plurality of through-holes extending along a plane substantially orthogonal to the axis of the support shaft portion, the fastening portion including the bolt inserted into the through-hole by the fastening means. In the mounting method of the pulley bracket that is mounted on the mounted surface substantially parallel to the axis of the engine,
The attachment angle correction portion provided on the pulley bracket is brought into contact with a correction surface substantially orthogonal to the axis of the internal combustion engine, and fastening by the fastening means is performed in this contact state, whereby the attachment portion is attached to the internal combustion engine. A method of attaching a pulley bracket, wherein the attachment portion is attached to the internal combustion engine with the angle corrected. 9. The fastening angle correction portion is fastened to the internal combustion engine by auxiliary fastening means in a state where the bolt of the fastening means is inserted into the through hole of the attachment portion prior to fastening by the fastening means. How to install the pulley bracket.

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