Chain guide

Abstract

Chain guide with a guide shoe (110) which guides a running chain (CH) by sliding on the running chain (CH), and a plate (120) which reinforces the guide shoe (110) in a chain running direction, in which the guide shoe (110) has a running guide portion extending in the chain running direction and a slotted groove (112) formed on a rear surface side of the running guide portion and into which the plate (120) can be inserted from below, a flat surface portion (121) is formed on an end surface of the plate (120) on one side in a width direction, a width of the flat surface portion (121) formed on the end surface in at least a part of the plate (120) that comes into contact with another element is formed such that it is greater than the width of the flat surface portion (121) formed on the end surface in a part of the plate (120) that does not come into contact with any other element, the plate (120) has a mounting hole (123) into which a mounting shaft (P) is inserted for attaching the plate (120) to an attachment object, and the flat surface portion (121) formed on the end surface in an inner peripheral portion of the attachment hole (123) on a distal side of an insertion direction of the attachment shaft (P) is formed such that a diameter of the attachment hole (123) is large on the proximal side of the insertion direction of the attachment shaft (P) and gradually decreases toward the distal side, so that during attachment, the front end of the attachment shaft (P) does not come into contact with an inner peripheral end surface of the attachment hole (123) in the plate (120) even if a positional deviation occurs between the attachment hole (123) in the plate (120) and an attachment hole in the guide shoe (110), and consequently the plate (120) can be inserted smoothly.

Description

BACKGROUND OF THE INVENTION1.Technical Field of InventionThe present invention relates to a chain guide including a guide shoe that guides a running chain by sliding on the running chain, and a plate that reinforces the guide shoe in a chain running direction.2. Description of the Related ArtA chain guide having a guide shoe that guides a chain running between sprockets by sliding on the chain is known to be used to stabilize the running chain and maintain an appropriate amount of tension.As shown in FIG. 5, for example, in a known timing system for an engine in which a transmission chain CH such as a roller chain is caused to run, which is continuously wound between sprockets S 1, S 2 provided on a crankshaft and a camshaft, respectively, in an engine room E, the timing chain CH is continuously wound between a drive sprocket S 1 attached to the crankshaft in the engine room E and a pair of driven sprockets S 2 attached to the camshaft, and the timing chain CH is guided by a pivotable chain guide (a pivotable guide) 500 and a chain guide (a fixed guide) 600.In this known timing system, the fixed guide 600 is fixed in the engine room E with two fixed mounting shafts Q, while the swingable guide 500 is mounted in the engine room E so as to be capable of swinging around a swingable mounting shaft P in a winding plane of the timing chain CH.A chain tensioner T maintains a proper tension of the timing chain CH at an appropriate level and suppresses vibration of the timing chain CH by pressing against the pivotable guide 500.The chain guide (pivotable guide) 500 and the chain guide (fixed guide) 600 used in this known timing system are integrally formed of synthetic resin, and therefore, in order to ensure sufficient rigidity and durability of the chain guides, respective guide main bodies thereof must be enlarged to realize improvements in rigidity and durability. However, it becomes difficult to achieve a compact layout for the engine room E.Therefore, in an available configuration (see Japanese Patent Application Laid-Open JP H06-2 810 A, Japanese Patent Application Laid-Open JP H03-130 156 A, Japanese Patent Application Laid-Open JP H02-266 964 A and so forth) shown in FIGS. 6 to 8, the chain guide 500 is provided with a guide shoe 110 that guides the running chain by sliding on the running chain and a plate 520 that reinforces the guide shoe 110 in a chain running direction, a slot groove 112 into which the plate 520 can be inserted from below is provided on the back surface side of the running guide portion 111 of the guide shoe 110, and the high-rigidity and-durability plate 520 is inserted into the slot groove 112. At this time, the strength, rigidity, and durability required for the chain guide 500 as a whole are secured, and a space occupied thereby is reduced.The plate 520 fixedly inserted into the slot groove 112 of this known chain guide 500 is typically made of a metal plate and manufactured by punching or the like. Therefore, as shown in a sectional view in FIG. 9, a narrow flat surface portion 521 is formed by shearing on one side in a width direction on an end surface of an outer periphery, a hole portion, and so on formed by punching or the like, and a fracture surface portion 522 is formed from the flat surface portion 521 toward an opposite side in the width direction.The flat surface portion 521 is a surface which is perpendicular to a side surface of the plate 520 and has few irregularities, while the fracture surface portion 522 is a surface inclined away from the flat surface portion 521.SUMMARY OF THE INVENTIONThe flat surface portion 521 constitutes a small part of the end surface of the plate 520 of the known chain guide 500, and therefore, when the plate 520 is inserted up to a lower portion of the slot groove 112 in the guide shoe 110, as shown in FIG. 10, the plate 520 and the guide shoe 110 may incline along the inclined fracture surface portion 522.The flat surface portion 521 also forms a small part of the end surface in a part of the plate 520 that comes into contact with the tensioner T, and therefore the plate 520 may incline when the chain tensioner T presses against it.When the guide shoe 110 and the plate 520 incline, the running guide portion 111 inclines relative to an original running surface of the chain. Accordingly, the chain itself is bent to be guided at an inclination, and thus the chain collides with the sprockets, resulting in amplification of vibration and noise.Further, an end-of-chain pushing force received by the running guide portion 111 is concentrated on one side in the width direction such that wear proceeds on the guide shoe 110, resulting in a decrease in durability and finally breakage.The narrow flat surface portion 521 is also formed by shearing on one side in the width direction at an inner circumferential end surface of a mounting hole 523 of the plate 520 into which the mounting shaft is inserted, and the fracture surface portion 522 is formed from the flat surface portion 521 toward the opposite side in the width direction. Therefore, as shown in FIGS. 11 to 13, the flat surface portion 521 side has a smaller diameter.Thus, as shown in FIG. 11, when a positional deviation occurs between the plate 520 and a mounting hole 113 of the guide shoe 110 after the insertion of the plate 520 into the slot groove 112 of the guide shoe 110 while the flat surface portion 521 is positioned on a mounting side, a front end of the mounting shaft P comes into contact with the inner circumferential end surface of the mounting hole 523 in the plate 520 during mounting, thereby hindering an operation.Further, as shown in FIG. 12, the attachment shaft P is provided on a stud bolt, and therefore, when the attachment shaft P is inserted from an opposite side to the attachment side while the flat surface portion 521 is positioned on the opposite side to the attachment side, the front end of the attachment shaft part P comes into contact with the inner circumferential end surface of the attachment hole 523 in the plate 520 upon insertion of the stud bolt, thereby hindering operation.Further, as shown in FIG. 13, the fracture surface portion 522 on the inner peripheral end surface of the attachment hole 523 gradually increases in diameter from the flat surface portion 521 side such that a width of the flat surface portion 521 decreases, and therefore the plate 520 can incline relative to the attachment shaft P.Further, when the chain guide 500 is pivoted, the flat surface portion 521 having the narrow width receives a strong force, so that it slides in an unstable manner. Consequently, noise and vibration are generated, and the wear rapidly progresses, resulting in a decrease in durability and finally breakage and seizure.Further, the narrow flat surface portion 521 is also formed by shearing on one side in the width direction on an inner circumferential end surface of an engaging hole 524 in the plate 520 with which a locking piece 114 provided on the guide shoe 110 engages, and the fracture surface portion 522 is formed from the flat surface portion 521 toward the opposite side in the width direction. Consequently, the flat surface portion 521 side has a reduced diameter, and the fracture surface portion 522 side has a larger diameter.Thus, when the locking piece 114 is engaged with the side of the fracture surface portion 522 of the inner circumferential end surface of the engaging hole 524, as shown in FIG. 14, a gap D is formed between the locking piece 114 and the engaging hole 524, so that the guide shoe 110 and the plate 520 cannot be accurately fixed in position. Consequently, positional deviation occurs between the attachment hole 113 of the guide shoe 110 and the attachment hole 523 of the plate 520, thereby hindering an attachment operation to the attachment shaft P.In contrast, when the locking piece 114 is engaged with the flat surface portion 521 side of the inner peripheral end surface of the engaging hole 524, as shown in FIG. 15, although a gap is unlikely to form between the locking piece 114 and the engaging hole 524, when the plate 520 is inserted into the slot groove 112 in the guide shoe 110, a corner of the flat surface portion 521 abuts and slides on an upper end surface on the locking piece 114 such that the locking piece is elastically deformed toward the side, and thus a sliding surface of the locking piece 114 is likely to be damaged.The present invention is intended to solve the above-described problems by providing a chain guide with high durability that is simple in design, easy to assemble, unlikely to be inclined or folded, and unlikely to be worn or broken.The present invention solves the above-described problems by providing a chain guide including a guide shoe that guides a running chain by sliding on the running chain and a plate that reinforces the guide shoe in a chain running direction, the guide shoe including a running guide portion that extends in the chain running direction and a slot groove that is formed on a back surface side of the running guide portion and into which the plate can be inserted from below, a flat surface portion is formed on an end surface of the plate on one side in a width direction, and a width of the flat surface portion formed on the end surface at least in a part of the plate that comes into contact with another member is formed to be larger than the width of the flat surface portion, which is formed on the end surface in a part of the plate that does not come into contact with any other member.In the chain guide according to claim 1 and the plate according to claim 9, the plate that provides strength, rigidity, and durability is formed of a material different from that of the guide shoe, and the plate can be inserted from below into the slot groove provided on the back surface side of the running guide portion of the guide shoe. Consequently, the chain guide can be configured easily and assembled easily, and the strength, rigidity, and durability required for the chain guide as a whole can be secured, thereby reducing a space occupied thereby.Further, by forming the width of the flat surface portion formed on the end surface at least in a part of the plate that comes into contact with another member to be larger than the width of the flat surface portion formed on the end surface in the part of the plate that does not come into contact with another member, other members come into contact with the flat surface portion only in the parts having the wide flat surface portion, and therefore can be prevented from coming into contact with an inclined fracture surface portion.Thus, relative skew between the plate and another member that comes into contact with the plate can be prevented, and a situation in which a force is concentratedly received in a narrow flat surface portion can be prevented. Consequently, skew and rattle of the chain guide can be reduced, resulting in less likelihood of wear and breakage and improvement in durability.In a configuration described in claim 2, the lower portion of the slot groove and the plate come into contact with each other in the wide flat surface portion, and therefore the running guide portion does not incline relative to the original running surface of the chain. Thus, the chain itself is prevented from being bent to be guided at an inclination, and thus vibration and noise generated by collision with a sprocket can be reduced.Further, a pushing force coming from the chain received by the running guide portion is not concentrated on one side in the width direction, and therefore, wear on the guide shoe can be prevented, thereby enabling improvement in durability and prevention of breakage.In a configuration described in claims 1 and 9, the flat surface portion formed on the end surface in the inner peripheral portion of the attachment hole is formed on a far side of an insertion direction of the attachment shaft, and therefore the plate may be arranged such that a diameter of the attachment hole on the near side of the insertion direction of the attachment shaft is large and gradually decreases toward the far side.Thus, during mounting, even if positional deviation occurs between the mounting hole in the plate and a mounting hole in the guide shoe, the front end of the mounting shaft does not come into contact with the inner peripheral end surface of the mounting hole in the plate, and thus the plate can be smoothly inserted.In a configuration described in claim 3, by ensuring that the end surface of the inner peripheral portion of the attachment hole and the attachment shaft come into contact with each other in the wide flat surface portion, the pressing force is dispersed so that the plate can be attached stably. Thus, noise and vibration can be reduced while wear and seizure when the chain guide pivots are reduced. Consequently, the likelihood of breakage is reduced, resulting in improvement in durability.In a configuration described in claim 4, even when the jig and the plate directly contact each other, the contact occurs in the wide flat surface portion, and therefore the plate does not skew upon receiving a pressing force from the jig. Thus, a situation in which the running guide portion tilts such that the chain itself is bent to be guided at a tilt can be prevented, and thus vibration and noise generated by a collision with a sprocket can be reduced.Further, a force is not concentrated at a narrow location on the end surfaces of the jig and the plate, and therefore breakage is unlikely to occur, thereby enabling improvement in durability.In a configuration described in claim 5, the locking piece provided on the guide shoe is provided to be advanced into the flat surface portion formed on the end surface of the inner peripheral portion of the engaging hole, and therefore no gap is formed between the locking piece and the engaging hole. Consequently, the guide shoe and the plate can be accurately fixed in position.In a configuration described in claim 6, the locking piece impinges on the wide flat surface portion on the end surface of the inner peripheral portion of the engaging hole, and therefore, no force is concentrated at a narrow location of the locking piece. Consequently, breakage is unlikely to occur, thereby enabling improvement in durability.In a configuration described in claim 7, when the disk is inserted into the slot groove in the guide shoe, the inclined surface portion formed on the upper end surface abuts on the slider to slide on the slider, and therefore the locking piece can be elastically deformed sideways smoothly without damaging the sliding surface of the locking piece.In a configuration described in claim 8, the flat surface portions having a width larger than that of the flat surface portion formed on the end surface in the part of the plate that does not come into contact with any other member are all formed on an identical surface side, and therefore the flat surface portions can be formed in a single process such as scraping.BRIEF DESCRIPTION OF THE DRAWINGSFIG. 1 is a sectional view showing a plate of a chain guide according to an embodiment of the present invention; FIG. 2 is an illustrative sectional view showing a mounting hole part of the chain guide according to this embodiment of the present invention; FIG. 3 is an illustrative sectional view showing the attachment hole part (in a case where an attachment shaft is provided to a shoulder bolt) of the chain guide according to this embodiment of the present invention; FIG. 4 is an illustrative sectional view showing a locking hole part of the chain guide according to this embodiment of the present invention; FIG. 5 is an illustrative view showing a known timing system of an engine; FIG. 6 is a perspective view showing a known chain guide; FIG. 7 is a perspective view illustrating the chain guide of FIG. 6 from another direction; FIG. 8 is a side view of the chain guide shown in FIG. 6 ; FIG. 9 is an illustrative sectional view showing a plate of the known chain guide; FIG. 10 is an illustrative sectional view illustrating a portion A-A of the chain guide shown in FIG. 8 ; FIG. 11 is an illustrative sectional view illustrating a portion B-B of the chain guide shown in FIG. 8 during attachment; FIG. 12 is an illustrative sectional view illustrating the portion B-B of the chain guide shown in FIG. 8 during attachment (in a case where an attachment shaft is provided to a shoulder bolt); FIG. 13 is an illustrative sectional view showing the portion B-B of the chain guide shown in FIG. 8 after mounting; FIG. 14 is an illustrative sectional view showing a locking hole part of the known chain guide; and FIG. 15 is an illustrative sectional view showing a case where a flat surface portion of a plate shown in FIG. 14 is disposed on an opposite side.DESCRIPTION OF THE PREFERRED EMBODIMENTSAs long as a chain guide according to the present invention is a chain guide including a guide shoe that guides a chain by sliding on the running chain and a plate that reinforces the guide shoe in a chain running direction, the guide shoe including a running guide portion extending in the chain running direction and a slot groove formed on a back surface side of the running guide portion and into which the plate can be inserted from below, a flat surface portion formed on an end surface of the plate on a width direction side, and a width of the flat surface portion formed on the end surface at least in a part of the plate that comes into contact with another member is formed to be larger than the width of the flat surface portion formed on the end surface in a part of the plate, That does not come into contact with any other member, thereby providing a chain guide having high durability, that is configured easily, that is easy to install, that is unlikely to be inclined or folded, and that is unlikely to be worn or broken, there are no limitations on a specific configuration thereof.Further, as long as the plate according to the present invention is a plate reinforcing, in a chain running direction, a guide shoe that guides a running chain by sliding on the running chain, a flat surface portion is formed on an end surface of the plate on a width direction side, and a width of the flat surface portion formed on the end surface at least in a part that comes into contact with another member is formed to be larger than the width of the flat surface portion formed on the end surface in a part that comes into contact with no other member, there are no restrictions on a specific configuration thereof.The plate is preferably made of a metallic material and particularly preferably made of rolled steel sheet. However, as long as the material can be punched, a suitable known material can be selected according to the conditions of rigidity, durability, moldability, cost and so on.The guide shoe is preferably formed of a synthetic resin material, but a suitable known material may be selected according to the conditions of frictional resistance, rigidity, durability, moldability, cost and so on.[Embodiment]A chain guide (a pivotable guide) according to an embodiment of the present invention will be described below on the basis of the drawings.The chain guide according to this embodiment of the present invention is applied to the above-described conventional timing system, and is configured in substantially the same manner as the conventional chain guide 500 shown in FIGS. 5 to 8 (FIGS. 5 to 8 are also mentioned below in the description of this embodiment) except for a cross-sectional shape of a plate 120.The plate 120 is formed of a plate-shaped member that extends in the chain running direction and that is formed into a predetermined curved shape in the chain running direction.The plate 120 has a uniform cross section in the chain running direction and is made by punching from rolled steel sheet. As shown in FIG. 1, a wide flat surface portion 121 is formed by scraping on an end surface of at least a part of the plate 120 that comes into contact with another member, and an inclined fracture surface portion 122 is formed with a narrow width.Note that the wide flat surface portion 121 is not limited to being formed by scraping, but may be formed by grinding, cutting, plastic deformation, and the like after punching. Alternatively, the wide flat surface portion 121 may be formed by performing precision punching other than punching or by another forming method.By forming the wide flat surface portion 121 on the end surface of a part of the plate 120 that comes into contact with the lower portion of the slot groove 112 as shown in FIG. 1, the inclination between the plate 520 and the guide shoe 110 shown in FIG. 10 is prevented, and therefore the running guide portion does not incline relative to the original running surface of the chain.Further, by forming the wide flat surface portion 121 on the end surface of a part of the plate 120 that comes into contact with the jig T, the plate 120 does not incline upon receiving the pressing force coming from the jig T.As shown in FIG. 2, the flat surface portion 121 formed on an end surface of an inner circumferential surface of a mounting hole 123 of the plate 120 into which the mounting shaft P is inserted is disposed so as to be formed on a distal side in an insertion direction of the mounting shaft P.Therefore, even if a positional deviation occurs between the attachment hole 123 of the plate 120 and the attachment hole 113 of the guide shoe 110, the front end of the attachment shaft P does not come into contact with the inner peripheral end surface of the attachment hole 123 in the plate 120 during attachment to the attachment shaft P, and thus the attachment shaft P can be smoothly inserted.Note that, in the embodiment shown in FIG. 2, the flat surface portion 121 on the end surface of the inner peripheral portion of the attachment hole 123 has a substantially same narrow width as the known flat surface portion, but a wide flat surface portion may be formed instead, and thereby the pressing force is dispersed so that the plate 120 can be attached stably. Consequently, noise and vibration can be reduced, and wear and seizure when the chain guide pivots can be reduced.Further, as shown in FIG. 3, when the attachment shaft P is provided on a stud bolt, the attachment shaft P is inserted from a side opposite to the side shown in FIG. 2, and therefore the flat surface portion 121 is also disposed on the opposite side.The plate 120 is provided with an engaging hole 124 in which the locking piece 114 provided on the guide shoe 110 is engaged, and when the plate 120 is inserted into the slot groove 112 of the guide shoe 110, the locking piece 114 is engaged with the engaging hole 124 to prevent the plate 120 from dropping out.As shown in FIG. 4, an inclined surface portion 125 is formed on the end surface of the part of the plate 120 that comes into contact with the lower portion of the slot groove 112 of the guide shoe 110 in a part through which the lock piece 114 passes when the plate 120 is inserted into the slot groove 112.Thus, the inclined surface portion 125 on the upper end surface abuts and slides on the locking piece 114, and therefore the plate 120 can be inserted, with the locking piece 114 being elastically deformed gently sideways so that the sliding surface of the locking piece 114 is not damaged.Note that, in the embodiment shown in FIG. 4, the flat surface portion 121 on the end surface of the inner peripheral portion of the engaging hole 124 has a substantially same narrow width as the known flat surface portion, but instead a wide flat surface portion may be formed such that the locking piece 114 abuts on the wide flat surface portion 121 on the end surface of the inner peripheral portion of the engaging hole 124. At this time, a force is not concentrated at a narrow location of the locking piece 114, and therefore breakage can be prevented, thereby enabling improvement in durability.Further, the wide flat surface portions 121 formed on the plate 120 are all formed on an identical surface side, and therefore, the wide flat surface portions 121 can be formed at all locations simultaneously during the scraping or precision punching process. Consequently, the plate 120 can be easily manufactured.Further, when the attachment shaft P is provided to a stud bolt, the flat surface portion 121 is disposed on the end surface of the inner peripheral portion of the attachment hole 123 on the opposite side to the side shown in FIG. 2. Therefore, by configuring the lock piece 114 shown in FIG. 4 to be also disposed on the opposite side, all of the flat surface portions 121 can be set on the same surface side.In the chain guide and the plate 120 according to this embodiment configured as described above, reinforcement is provided by the plate 120 formed of a metallic material that provides strength, rigidity, and durability, and therefore, a reduction in the size of the chain guide can be achieved as a whole, so that when it is fixed in the engine room, the space occupied by it can be reduced. Further, by providing the wide flat surface portions 121 on the plate 120 on the end surface of predetermined outer peripheries, hole portions, and so forth, a chain guide with high durability that is easy to mount, is unlikely to be inclined or rattled, and is unlikely to be worn or broken can be provided.The chain guide according to the above-described embodiment is configured as a pivotable guide that is pivotally attached to the single pivotable attachment shaft P, but may be configured as a fixed guide that is fixed to the plurality of fixed attachment shafts Q.Further, shapes, positions, dimensions, positional relationships, and so forth of the respective constituent elements can be changed in various ways.Further, in this embodiment, the chain guide is provided in an engine having a timing system, but the present invention is not limited thereto and can be used in various other devices.Further, the present invention is not limited to a transmission mechanism using a chain, but can be used in a substantially same transmission mechanism using a belt, a rope, or the like, and can be widely used in various industrial fields.

Claims

A chain guide comprising a guide shoe (110) that guides a running chain (CH) by sliding on the running chain (CH), and a plate (120) that reinforces the guide shoe (110) in a chain running direction, wherein the guide shoe (110) includes a running guide portion extending in the chain running direction and a slot groove (112) formed on a back surface side of the running guide portion and into which the plate (120) can be inserted from below, a flat surface portion (121) is formed on an end surface of the plate (120) on one side in a width direction, a width of the flat surface portion (121) formed on the end surface at least in a part of the plate (120) that comes into contact with another member is formed such that, being larger than the width of the flat surface portion (121) formed on the end surface in a part of the plate (120) that does not come into contact with any other member, the plate (120) has a mounting hole (123) into which a mounting shaft (P) for mounting the plate (120) to a mounting object is inserted, and the flat surface portion (121) formed on the end surface in an inner peripheral portion of the mounting hole (123) is formed on a far side of an insertion direction of the mounting shaft (P) such that a diameter of the mounting hole (123) on the near side of the insertion direction of the mounting shaft (P) is large and gradually decreases toward the far side, such that, during mounting, the front end of the mounting shaft (P) does not come into contact with an inner circumferential end surface of the mounting hole (123) in the plate (120) even when a positional deviation occurs between the mounting hole (123) in the plate (120) and a mounting hole in the guide shoe (110), and thus the plate (120) can be smoothly inserted.The chain guide according to claim 1, wherein the width of the flat surface portion (121) formed on the end surface in a part of the plate that comes into contact with a lower portion of the slot groove (112) is formed to be larger than the width of the flat surface portion (121) formed on the end surface in the part of the plate (120) that does not come into contact with any other member.The chain guide according to claim 1 or 2, wherein the width of the flat surface portion (121) formed on the end surface in the inner peripheral portion of the attachment hole (123) is formed to be larger than the width of the flat surface portion (121) formed on the end surface in the part of the plate (120) that does not come into contact with any other member.The chain guide according to any one of claims 1 to 3, wherein the width of the flat surface portion (121) formed on the end surface in a part of the plate (120) that comes into contact with a tensioner is formed to be larger than the width of the flat surface portion (121) formed on the end surface in the part of the plate that does not come into contact with any other member.The chain guide according to any one of claims 1 to 4, wherein the plate has an engaging hole (124) engaged by a locking piece (114) provided on the guide shoe (110), and the locking piece (114) provided on the guide shoe (110) is provided to be advanced into the flat surface portion (121) formed on the end surface in an inner peripheral portion of the engaging hole (124).The chain guide according to claim 5, wherein the width of the flat surface portion (121) formed on the end surface in the inner peripheral portion of the engaging hole (124) is formed to be larger than the width of the flat surface portion (121) formed on the end surface in the part of the plate (120) that does not come into contact with any other member.The chain guide according to claim 5 or 6, wherein an inclined surface portion (125) is formed on the end surface in the part of the plate (120) that comes into contact with the lower portion of the slot groove (112), the inclined surface portion (125) being formed on a part through which the locking piece (114) passes when the plate (120) is inserted into the guide shoe (110).The chain guide according to any one of claims 1 to 7, wherein the flat surface portions (121) having a width larger than the flat surface portion formed on the end surface in the part of the plate (120) that does not come into contact with any other member are all formed on the same surface side.A plate (120) reinforcing, in a chain running direction, a guide shoe (110) that guides a running chain (CH) by sliding on the running chain (CH), in which a flat surface portion (121) is formed on an end surface of the plate (120) on one side in a width direction, a width of the flat surface portion (121) formed on the end surface at least in a part contacting another member is formed to be larger than the width of the flat surface portion (121) formed on the end surface in a part contacting no other member, the plate (120) has a mounting hole (123) into which a mounting shaft (P) for mounting the plate (120) to a mounting object is inserted, and the flat surface portion (121) formed on the end surface in an inner peripheral portion of the mounting hole (123) is formed on a far side of an insertion direction of the mounting shaft (P) such that a diameter of the mounting hole (123) is large on the near side of the insertion direction of the mounting shaft (P) and gradually decreases toward the far side so that during mounting, the front end of the mounting shaft (P) does not come into contact with an inner peripheral end surface of the mounting hole (123) in the plate (120) even if a positional deviation occurs between the mounting hole (123) in the plate (120) and a mounting hole in the guide shoe (110), and thus the plate (120) can be smoothly inserted.

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