JP5307081B2 - Fixed chain guide for engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixed chain guide for an engine, having a simple structure and reliably preventing a shoe member from being arranged in the wrong direction. <P>SOLUTION: The fixed chain guide 100 for an engine includes: a shoe member 120 having a chain slide part 121, a support/contact part 122, a chain entry side fitting installation part 123a, and a chain exit side fitting installation part 123b; and a base plate member 110 having a shoe support part 111 provided on both ends with a chain entry side fitting notch part 114a and a chain exit side fitting notch part 114b that faces and is engaged with the chain entry side fitting installation part 123a, and the chain exit side fitting installation part 123b of the shoe member 120. The fixed chain guide 100 for an engine guides and regulates the moving transmission chain C. The chain entry side fitting notch part 114a and the chain exit side fitting notch part 114b of the base plate member 110 are formed in asymmetry as viewed in the chain width direction. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a fixed chain guide for an engine used for sliding guide of a transmission chain by sliding contact with the transmission chain and prevention of vibration, for example, a roller that circulates around a driving side sprocket and a driven side sprocket. The present invention relates to an engine fixed chain guide used in a timing system such as an automobile engine that transmits power by a transmission chain such as a chain or a silent chain.

Conventionally, a fixed chain guide for an engine is used so that when the vibration of a circulating transmission chain reaches a certain magnitude or more, the pad comes into contact with the transmission chain to suppress the vibration of the transmission chain.
A known fixed chain guide for an engine includes a pad that contacts and guides a transmission chain that circulates between two cam sprockets, and a support plate to which the guide pad is attached. It is installed and used for installation parts, such as an engine block (for example, patent document 1).

Japanese Utility Model Publication No. 3-77839 (FIGS. 1 and 4) Japanese Utility Model Publication No. 3-91557

However, the known fixed chain guide for an engine is installed on a mounting portion such as an engine block using a fastening means such as a bolt, and the mounting of the support plate mounting portion on the mounting portion has been considered. No particular consideration was given to attachment of a member that is in sliding contact with a transmission chain such as a pad or shoe.
By the way, a member such as a pad or a shoe is in contact with the transmission chain and is severely worn and damaged, so it is necessary to replace it appropriately. In the case of a known transmission guide, there is a support plate that is not damaged. It is necessary to replace the entire fixed chain guide for the engine, and there is a problem that it cannot be performed efficiently in the replacement of parts.

Therefore, it is conceivable to replace only the pad portion of the fixed chain guide for the engine. However, in the fixed chain guide for the engine formed by molding or the like as in the prior art, the welded pad portion is removed. There is a problem that the process itself requires a lot of labor.
Also, when attaching with adhesive, etc., it takes a lot of work to remove the damaged shoe. After removing the pad with great effort, pay close attention to the attachment position. There was a problem in work efficiency that it was necessary to paste the pad.

Therefore, the present invention is intended to solve the conventional problems. That is, the object of the present invention is to fix a chain member for an engine, in which the assembly work of the shoe member is simplified when the pad, that is, the shoe member is assembled. Is to provide.
Further, the fixed chain guide for an engine as in the prior art has a simple shape as shown in FIG. 12 and includes the possibility of being assembled in the wrong direction during the assembling work. In view of the above, it is an object of the present invention to provide a fixed chain guide for an engine that simplifies assembly work and reliably prevents erroneous assembly in which shoe members are erroneously arranged in the reverse direction.

First, a fixed chain guide for an engine according to the first aspect of the present invention includes a chain sliding contact portion that is in sliding contact with a transmission chain, a support contact portion that is located on the opposite side of the chain sliding contact portion, and both ends of the support contact portion. A shoe member having a chain entry side fitting assembly portion and a chain delivery side fitting assembly portion located on the chain entry side fitting assembly portion and the chain delivery side fitting assembly portion of the shoe member. A fixed chain for an engine that includes a base plate member having a shoe support portion provided with a chain entry-side fitting cut-out portion and a chain-feeding-side fitting cut-out portion that are respectively opposed to each other, and that guides and regulates the travel of the transmission chain It is a guide, and the chain entry side fitting notch part and the chain sending side fitting notch part of the base plate member are formed asymmetrically when viewed from the chain width direction. More, it solves the problems described above.
In the above description, the term “chain entry side” or “chain delivery side” refers to the side on which the transmission chain enters toward the chain sliding contact portion of the shoe member with reference to the traveling direction of the transmission chain. “Chain entry side” and “chain delivery side” mean the side where the transmission chain is delivered from the chain sliding contact portion of the engine fixed chain guide.

  In the engine fixed chain guide according to the second aspect of the present invention, in addition to the configuration of the first aspect of the invention, the base plate member is provided in the vicinity of the transmission chain that travels between the cam sprockets. Thus, the above-described problem is further solved.

  According to a third aspect of the present invention, there is provided a fixed chain guide for an engine, in addition to the configuration of the first or second aspect of the invention, in addition to a chain entry side fitting notch portion and a chain delivery side fitting notch portion of the base plate member. Is formed with a larger notch than the other, and the chain entry side fitting assembly portion and the chain delivery side fitting assembly portion of the shoe member are the chain entry side fitting notch portion and chain. The above-described problems are further solved by engaging the concave and convex portions with each of the sending side fitting notches.

  According to a fourth aspect of the present invention, there is provided a fixed chain guide for an engine, in addition to the structure according to any one of the first to third aspects, in addition to a chain entry side fitting notch and a chain delivery side fitting of the base plate member. Either one of the joint notches is formed with a longer width in the chain longitudinal direction than the other, and the chain entry side fitting assembly portion and the chain delivery side fitting assembly portion of the shoe member are The above-described problem is further solved by engaging the concave and convex portions with the chain entry side fitting notch and the chain delivery side fitting notch, respectively.

  According to a fifth aspect of the present invention, there is provided a fixed chain guide for an engine, in addition to the structure of the first aspect of the present invention according to any one of the first to fourth aspects. Either one of the notch portions is formed in a deeper groove in the chain width direction than the other, and the chain entry side fitting assembly portion and the chain delivery side fitting assembly portion of the shoe member are arranged on the chain entry side. The above-described problems are further solved by disposing the fitting notches and the chain-feeding-side fitting notches at the positions where they are concavo-convexly fitted.

  The invention according to claim 1 includes a chain sliding contact portion that is in sliding contact with the transmission chain, a support contact portion that is positioned on the opposite side of the chain sliding contact portion, and a chain entry side fitting assembly that is positioned at both ends of the support contact portion. And a chain entry side fitting that includes a shoe member having a fitting part and a chain delivery side fitting assembly part, and is fitted opposite to the chain entry side fitting assembly part and the chain delivery side fitting assembly part of the shoe member. A fixed chain guide for an engine that includes a base plate member having a shoe support portion provided with a notch portion and a chain-feed-side fitting notch portion at both ends, and guides and regulates the travel of the transmission chain, thereby allowing two fittings of the shoe member Since the assembly part is fitted and assembled to each of the two fitting notches of the base blade member, the shoe member can be easily assembled to the base plate member. It is Rukoto, it is possible to obtain the significant effect that corresponds to the specific configuration as follows.

  That is, in the engine fixed chain guide according to the first aspect of the present invention, the chain entry side fitting notch portion and the chain sending side fitting notch portion of the base plate member are formed asymmetrically when viewed from the chain width direction. Even if the chain sliding contact part is arranged upside down during the assembly work, the fitting assembly part of the shoe member will be positioned opposite to the original position with respect to the fitting notch provided in the base plate member. Since these do not engage with each other and the shoe member cannot be assembled to the base plate member, it is possible to reliably prevent erroneous assembly in which the shoe member is erroneously disposed in the upside down direction.

In addition, by preventing incorrect assembly in the upside down direction, the gap between the shoe member and the transmission chain is expanded and vibration is not generated in the transmission chain. Since the chain does not come into contact, the timing system can be operated smoothly without adversely affecting the travel of the transmission chain, and the shoe assembly can be connected to the traveling transmission chain. Occurrence of abnormal noise and wear / damage of the fixed chain guide for the engine can be greatly suppressed.
Furthermore, the structure that prevents such erroneous assembly modifies existing structures such as the fitting notch of the base plate member and the fitting assembly of the shoe member without adding new members or extra work. Therefore, it is possible to produce a misassembly prevention structure without providing any additional means to the extent that the molding or punching die is changed.

  In addition to the effect produced by the invention according to claim 1, the engine fixed chain guide of the invention according to claim 2 has a base plate member provided in the vicinity of the transmission chain that travels between the cam sprockets. In order to prevent the transmission chain from swinging or dancing between the cam sprockets due to the extension of the transmission chain or the centrifugal force acting on the transmission chain, it prevents the transmission chain from being worn or abnormal noise between the cam sprockets. be able to.

  The fixed chain guide for an engine according to a third aspect of the invention has the effects of the invention according to the first or second aspect, in addition to the chain entry side fitting notch portion and the chain sending side fitting notch portion of the base plate member. Either one is formed with a larger notch than the other, and the chain entry side fitting assembly and the chain delivery side fitting assembly of the shoe member are the chain entry side fitting notch and the chain delivery side fitting. By fitting the concaves and convexes relative to the notch parts, the work to form the asymmetric structure described above can be made with a simple change that only changes the size of the fitting notch part. Therefore, it is possible to easily produce a structure for preventing erroneous assembly with little additional work.

  The fixed chain guide for an engine according to a fourth aspect of the invention has the effect of the invention according to any one of the first to third aspects, in addition to the fitting notch on the chain entry side of the base plate member and the chain delivery side fitting. Either one of the notches is notched longer in the longitudinal direction of the chain than the other, and the chain entry side fitting assembly and the chain delivery side fitting assembly of the shoe member are fitted on the chain entry side. By engaging the notch part and the chain-feeding-side fitting notch part relative to each other, the fitting assembly part of the shoe member that fits into the long fitting notch part has a long width to improve strength. Thus, the resistance to vibration transmitted from the traveling transmission chain is improved and the durability of the fitting assembly is improved, so that the durability of the shoe member can be improved and the life can be extended.

  The fixed chain guide for an engine of the invention according to claim 5 has the effect of the invention according to any one of claims 1 to 4 in addition to the chain entry side fitting notch portion of the base plate member and the chain delivery side fitting. Either one of the notches is formed in a deeper groove in the chain width direction than the other, and the chain entry side fitting assembly portion and the chain delivery side fitting assembly portion of the shoe member are the chain entry side fitting notch portion and Because the notch is deepened and the base plate member is reduced in weight by being arranged at the position where the recesses and protrusions are fitted relative to the chain delivery side fitting notch, the material saving and weight reduction of the base plate member is achieved. It was possible to improve the performance of the engine, and previously it was only provided at the side end of the shoe member, and it was difficult to secure the strength In order to change the fitting assembly part of the new member to the position where it is easy to adjust the structure of the fitting assembly part from the end to the center, corresponding to the deep fitting notch part of the base plate member. The strength can be further improved by increasing the strength of the part.

The usage aspect figure of the stationary chain guide for engines which is this invention. The perspective view of the fixed chain guide for engines which is 1st Example of this invention. The perspective view of the baseplate member shown in FIG. The perspective view of the shoe member shown in FIG. The assembly explanatory view of the fixed chain guide for engines shown in FIG. FIG. 3 is an explanatory diagram of incorrect assembly of the engine fixed chain guide shown in FIG. 2. The perspective view of the fixed chain guide for engines which is 2nd Example of this invention. The perspective view of the baseplate member shown in FIG. The perspective view of the shoe member shown in FIG. The assembly explanatory view of the fixed chain guide for engines shown in FIG. FIG. 8 is an explanatory diagram of incorrect assembly of the engine fixed chain guide shown in FIG. 7. Schematic of the fixed chain guide for engines of a prior art.

  The present invention relates to a chain sliding contact portion that is in sliding contact with a transmission chain, a support contact portion that is located on the opposite side of the chain sliding contact portion, a chain entry side fitting assembly portion that is positioned at both ends of the support contact portion, and a chain delivery. A chain entry side fitting notch portion that includes a shoe member having a side fitting assembly portion and that is fitted to face the chain entry side fitting assembly portion and the chain delivery side fitting assembly portion of the shoe member. And a fixed chain guide for an engine that includes a base plate member having a shoe support portion provided at both ends with a chain feed-side fitting notch, and guides and regulates the travel of the transmission chain, the chain entry-side fitting notch of the base plate member The assembly and the chain delivery side fitting notch are asymmetrical when viewed from the width direction of the chain. As long as it reliably prevented with state, aspects of the specific implementation, may any be any one.

  In the present invention, the chain width of the chain entry side fitting notch part and the chain sending side fitting notch part on the base plate member side, the chain entry side fitting assembly part and the chain delivery side fitting assembly part on the shoe member side The direction, that is, the transmission chain guides are viewed from the side, and each has an asymmetric structure. With regard to the matter of “asymmetric formation”, the fitting assembly portion and the fitting notch portion that are appropriately opposed to each other However, the shape may be a shape that does not fit and cannot be assembled in an erroneously-matched combination, and various specific shapes are conceivable.

For example, as the shape of the chain entry side fitting notch and the chain delivery side fitting notch, one is a vertical straight line, the other is a horizontal straight fitting notch, and one is a vertical straight line or a horizontal straight line. A combination in which the other is an L-shaped fitting notch, or a combination of L-shaped fitting notches with different side length ratios is conceivable.
On the other hand, the chain entry side fitting assembly portion and the chain delivery side fitting assembly portion may be provided with ribs or the like having a shape that fits with the fitting cutout portion having the shape described above.
In addition, as a modification of the chain entry side fitting assembly part or the chain delivery side fitting assembly part, the fixed wall part existing at the front end or the rear end is used as an erroneous assembly prevention structure together with any of the fitting assembly parts. It may be used.
Furthermore, when it is difficult to change the position of the chain entry side fitting assembly or the chain delivery side fitting assembly, it is formed in the deep groove as a fitting assembly with a thick rib in the transmission chain width direction. You may make it engage with the fitting notch part of the made side.

  The shoe member may be any resin material as long as it exhibits wear resistance and self-lubricating properties. For example, the shoe member is made of polyamide resin, polyimide resin, PTFE resin, FRP resin, polymer polyethylene resin, or the like. It is more preferable that resin molding is performed using an appropriately selected polymer resin material.

The engine fixed chain guide according to the first embodiment of the present invention will be described below with reference to FIGS.
FIG. 1 is a schematic view of a timing system to which an engine fixed chain guide of the present invention is applied. FIG. 2 is a perspective view of an engine fixed chain guide according to a first embodiment of the present invention. 4 is a perspective view of a base plate member used for the engine fixed chain guide shown in FIG. 4, FIG. 4 is a perspective view of a shoe member used for the engine fixed chain guide shown in FIG. 2, and FIG. FIG. 6 is an explanatory view of assembly of the fixed chain guide, and FIG. 6 is an explanatory view of incorrect assembly of the fixed chain guide for the engine shown in FIG.

  First, as shown in FIG. 1, a timing system provided at an engine block end portion of an engine to which an engine fixed chain guide 100 according to an embodiment of the present invention is applied includes a transmission chain C, a crank sprocket S1, a cam. The sprocket S2, the guide guide G1, the tension applying guide G2, the chain tensioner T, the engine fixed chain guide 100, and the like are mounted in a conventionally known manner.

  The engine fixed chain guide 100 includes a shoe member 120 having a chain sliding contact portion 121 that is in sliding contact with the transmission chain C, and a base plate member 110 that is assembled and held on the shoe support portion 111. FIG. As shown, the shoe member 120 is used in a state where it is assembled to the shoe support 111 of the base plate member 110.

As shown in FIG. 3, the base plate member 110 includes a shoe support portion 111 to which the shoe member 120 is assembled, and a mounting seat 112 that is connected to the shoe support portion 111 and is fixed to the end of the engine block. An engagement hole 113 is provided in a bent portion between the portion 111 and the mounting seat 112.
Further, the mounting seat 112 is provided with a bolt hole 115. When the mounting seat 112 of the base plate member 110 is fixed to the end face of the engine block, a bolt is inserted into the bolt hole and fastened to the engine block. .
On one side surface of the base plate member 110 in the width direction of the transmission chain C, a chain entry side fitting notch 114a is formed on the upstream side with respect to the traveling direction of the transmission chain C, that is, on the chain entry side. A chain delivery side fitting notch 114b is formed on the downstream side, that is, on the chain delivery side with respect to the traveling direction of C.
Among these, since the chain entry side fitting notch 114a has a short width and the chain delivery side fitting notch 114b has a long width, when the base plate member 110 is viewed from the width direction of the transmission chain, the shoe member 120 is left and right. It can be seen that the structure is asymmetric.

As shown in FIG. 4, the shoe member 120 incorporated in the shoe support portion 111 of the base plate member 110 has a chain sliding contact portion 121 on the side facing the transmission chain C and the side opposite to the chain sliding contact portion 121. And a support contact portion 122 that is assembled and contacted with the shoe support portion 111 of the base plate member 110.
On one side of the support contact portion 122 in the chain width direction, on the chain entry side and the delivery side with reference to the chain traveling direction, the chain entry side fitting assembly portion 123a and the chain delivery side fitting assembly are respectively provided. A portion 123b is provided, and a fixing claw 126 is provided at a substantially central portion on the other side in the chain width direction of the support contact portion 122.
In addition, the fixed wall part 125 is provided in the chain entry side edge part of the shoe member 120 following the chain entry side fitting assembly part 123a.

The chain entry side fitting assembly portion 123a and the chain delivery side fitting assembly portion 123b of the shoe member 120 are one side surface in the chain width direction of the support contact portion 122 and are ends in the chain entry direction and the chain delivery direction. The portion includes a chain entry side fitting rib 124a and a chain delivery side fitting rib 124b.
The chain entry side fitting rib 124a and the chain delivery side fitting rib 124b correspond to the lengths of the chain entry side fitting notch 114a and the chain delivery side fitting notch 114b formed in the base plate member 110, respectively. A short-width chain entry-side fitting rib 124a and a long-width chain delivery-side fitting rib 124b.

As shown in FIG. 5, the shoe member 120 includes a support contact portion 122, a chain entry-side fitting assembly portion 123 a, and a chain delivery-side fitting assembly portion 123 b. Assemble from one side in the chain width direction.
At that time, the chain entry side fitting notch 114a has the chain entry side fitting rib 124a of the chain entry side fitting assembly 123a, and the chain delivery side fitting notch 114b has the chain delivery side fitting assembly. The chain delivery-side fitting ribs 114b of the portion 123b are assembled by being concavo-convexly fitted, and finally the fixing claw 126 is engaged with the engagement hole 113 of the base plate member 110, whereby the shoe member 120 is attached to the base plate member 110. On the other hand, it is fixed in the chain width direction.
The shoe member 120 is also fixed in the chain traveling direction by the fixed wall portion 125 provided at the end portion on the chain entry side.

The chain entry side fitting notch 114a and the chain entry side fitting rib 124a of the chain entry side fitting assembly 123a, and the chain delivery of the chain delivery side fitting notch 114b and the chain delivery side fitting assembly 123b Since the side fitting ribs 124b have widths corresponding to each other, if the assembling direction is correct, as shown in FIGS. 2 and 5, the short chain entering side provided in the chain entering side fitting assembly portion 123a. The fitting rib 124a has a short chain entry side fitting notch 114a, and the long chain feeding fitting rib 124b of the chain sending side fitting assembly 124b has a long chain sending side fitting notch. The shoe member 120 is assembled at a predetermined position of the shoe support portion 111 by being engaged with the portions 114b.
However, if the shoe member 120 is to be assembled upside down, as shown in FIG. 6, the chain delivery side fitting rib 124b of the chain delivery side fitting assembly portion 123b and the chain entry side fitting notch portion are provided. 114a has a different length, and in this state, the hatched portion on the side of the shoe support portion 111 of the base plate member 110 indicates the chain delivery side fitting of the chain delivery side fitting assembly portion 123b of the shoe member 120. The shoe member 120 cannot be assembled to the shoe support portion 111 of the base plate member 110 because it collides with the mating rib 124b.
Further, when the chain sending side fitting rib 124b of the shoe member 120 is long as in the first embodiment, the impact applied in the vertical direction of the shoe member 120 due to the vibration of the traveling transmission chain C and the like. Since the force is distributed and received by the long fitting ribs, the durability of the chain sending side fitting assembly portion 123b is improved.
In particular, when the longitudinal end face of the chain delivery side fitting assembly portion 123b is released, the strength cannot be improved by the fixed wall. Therefore, the durability by adopting the long fitting rib as described above. The improvement of sex is more effective.
The chain entry side fitting rib 124a has a long width, the chain delivery side fitting rib 124b has a short width, and the chain entry side fitting notch 114a to be concavo-convexly fitted thereto has a long width and the chain sending side fitting notch portion. Even if the fixed chain guide is configured with a short width 114b, it is the same that the shoe member 120 cannot be assembled upside down.

  In the engine fixed chain guide 100 according to the first embodiment obtained as described above, the chain entry side fitting notch 114a formed in the shoe support portion 111 of the base plate member 110 has a short width in the chain longitudinal direction. In addition, the chain delivery side fitting notch 114b is formed in a long width, and the chain entry side fitting assembly portion 123a and the chain delivery side fitting assembly portion 123b of the shoe member 120 are respectively fitted to the chain entry side fitting. Even when trying to assemble the shoe member 120 upside down by combining the notch portion 114a and the chain delivery side fitting notch portion 114b with an uneven fitting, the chain delivery side fitting assembly portion 123b is assembled. The long-width chain delivery-side fitting rib 124a does not fit into the short-width chain entry-side fitting notch 114a, and the shoe member 120 is The wrong assembly disposed opposite incorrectly can be reliably prevented.

Further, since the shoe member 120 is reliably incorporated at the designed position, the chain entry side fitting assembly portion 123a or the chain delivery side fitting assembly portion 123b of the shoe member 120 is not impaired without impairing the smooth operation of the timing system. The structure for preventing damage and abnormal noise due to contact between the transmission chain C and the transmission chain C, and preventing erroneous assembly can be obtained by using a chain entry side fitting assembly portion 123a or a chain delivery side fitting assembly portion 123b. The existing structure portion such as the chain entry side fitting rib 124a or the chain sending side fitting rib 124b or the chain entry side fitting notch 114a or the chain sending side fitting notch 114b formed in the shoe support 111 is provided. Since it is formed by utilizing it, it is possible to easily produce a misassembly prevention structure without adding a special member or an extra process.
Furthermore, the effect is enormous, for example, the chain sending side fitting rib 124b has a long width, thereby improving the strength of the chain sending side fitting assembly 123b and improving the durability of the shoe member 120.

Next, an engine fixed chain guide according to a second embodiment of the present invention will be described below.
7 is a perspective view of an engine fixed chain guide according to a second embodiment of the present invention, FIG. 8 is a perspective view of a base plate member used in the engine fixed chain guide shown in FIG. 7, and FIG. 7 is a perspective view of a shoe member used in the engine fixed chain guide shown in FIG. 7, FIG. 10 is an assembly explanatory view of the engine fixed chain guide shown in FIG. 7, and FIG. 11 is an engine fixed chain guide shown in FIG. FIG.
In the second embodiment and the first embodiment, the structure of the chain entry side fitting notch and the chain delivery side fitting notch of the base plate member, and the chain entry side fitting assembly and the chain delivery side of the shoe member Since only the structure of the fitting assembly is different, and the other points are the same as in the first embodiment, the corresponding items are simply read as the codes in the 100s to the codes in the 200s for the detailed explanation. Omitted.

The engine fixed chain guide 200 according to the second embodiment of the present invention is assembled in a state as shown in FIG. 7, and the base plate member 210 has a chain entry side fitting notch as shown in FIG. The portion 214a is formed in a deep groove in the chain width direction, whereas the chain feed-side fitting notch 214b is formed in a shallow groove in the chain width direction.
As shown in FIG. 9, the shoe member 220 has a chain entry side fitting set on one side in the chain width direction of the support contact portion 222 and at the end in the chain entry direction and the chain delivery direction, respectively. Attached portion 223a and a chain delivery side fitting assembly portion 223b are provided.
In the second embodiment, the chain delivery side fitting assembly portion 223b that fits with the shallow groove chain delivery side fitting notch 214b is located at the end of one side of the support contact portion 222 in the chain width direction. The chain entry side fitting assembly portion 223a is positioned closer to the center than the side end in the chain width direction so that the chain entry side fitting assembly portion 223a fits into the deep groove chain entry side fitting notch 214a. Yes.

The chain entry side fitting notch 214a, the chain entry side fitting assembly 223a, the chain delivery side fitting notch 214b, and the chain delivery side fitting assembly 223b are provided at corresponding positions. If the assembly direction is correct, as shown in FIGS. 7 and 10, the chain entry side fitting assembly portion 223a located near the center is formed on the chain entry side fitting notch portion 214a formed in the deep groove and on the side. The chain delivery side fitting assembly portion 224b located on the end side is fitted into the chain delivery side fitting notch portion 214b formed in the shallow groove, and the shoe member 220 is assembled at a predetermined position of the shoe support portion 211. .
On the other hand, when the shoe member 220 is turned upside down and assembled to the base plate member 210, as shown in FIG. 11, the chain entry side located closer to the center with respect to the chain delivery side fitting notch 214b of the shallow groove. The fitting assembly portion 223a collides, and the shoe member 220 cannot be assembled to the shoe support portion 211 of the base plate member 210.

Accordingly, also in the second embodiment, the shoe member 220 can be reliably prevented from being reversely assembled to the base plate member 210.
Further, in the case of the second embodiment, the chain entry side fitting assembly portion 223a is disposed closer to the center than the side end of the shoe member 220, so that the chain entry side fitting rib 224a constituting the shoe member 220 is disposed. It is also possible to improve the strength by increasing the thickness.
In the case of the second embodiment as well, the chain entry side cutout 214a is formed in a shallow groove, the chain delivery side cutout 214b is formed in a deep groove, and at positions corresponding to these cutouts, respectively. Even if the chain entry side fitting assembly portion 223a and the chain delivery side fitting assembly portion 223b are positioned, the shoe member 220 cannot be assembled in the upside down direction.

  In the engine fixed chain guide 200 according to the second embodiment obtained as described above, the chain entry side fitting notch portion 224a of the base plate member 210 is a deep groove in the chain width direction and the chain sending side fitting notch portion. 114b is formed in the shallow groove, and the chain entry side fitting assembly portion 213a and the chain delivery side fitting assembly portion 213b of the shoe member 220 are the chain entry side fitting cutout portion 214a and the chain delivery side fitting cutout portion. The chain entry side fitting assembly portion 213a arranged closer to the center is arranged even when trying to assemble the shoe member 220 upside down by being arranged at the position where the concave and convex portions are respectively opposed to the portion 214b. The shoe member 220 is assembled to the base plate member 210 because it collides with the side surface of the shallow groove groove delivery side fitting notch 214b. Since no vignetting can reliably prevent erroneous assembly disposed opposite incorrectly upper and lower shoe members 220.

Further, since the shoe member 220 is surely incorporated in the designed position, the chain entry side fitting assembly portion 223a of the shoe member 220 is not impaired without impairing the smooth operation of the timing system as in the first embodiment described above. Or, it is possible to prevent the occurrence of damage and abnormal noise caused by the contact between the chain sending side fitting assembly portion 223b and the transmission chain C, and the existing structural portion is used to prevent erroneous assembly. Therefore, the structure for preventing erroneous assembly can be easily manufactured without adding a special member or an extra step.
Furthermore, as a result of the chain entry side fitting notch 214b being formed in the deep groove, the width on the chain entry side of the base plate member 210 is reduced and the weight is reduced, so the amount of material can be saved and the performance of the engine can be improved. In addition, the chain entry side fitting assembly portion 223a is disposed closer to the center, so that the chain entry side fitting rib 224a can be thickened and the durability of the shoe member 220 can be improved.

100, 200 ... Engine fixed chain guide 110, 210 ... Base plate member 111, 211 ... Shoe support 112, 212 ... Mounting seat 113, 213 ... Engagement holes 114a, 214a ... · Chain entry side fitting notch 114b, 214b ··· Chain delivery side fitting notch 115, 215 ··· Bolt hole 120, 220 ··· Shoe member 121, 221 ··· Chain sliding contact portion 122, 222 ··· Support contact portion 123a, 223a ··· Chain entry side fitting assembly portion 123b, 223b ··· Chain delivery side fitting assembly portion 124a, 224a ··· Chain entry side fitting rib 124b, 224b ... Chain delivery side fitting ribs 125, 225 ... Fixed wall parts 126, 226 ... Joint C ... Transmission chain G1 ... Guide guide G2 ... Tension applying guide S1 ... Crank sprocket S2 ... Cam sprocket T ... Chain tensioner

Claims (5)

A chain sliding contact portion that is in sliding contact with the transmission chain, a support contact portion that is located on the opposite side of the chain sliding contact portion, a chain entry side fitting assembly portion that is positioned at both ends of the support contact portion, and a chain delivery side fitting A chain entry side fitting notch part and a chain delivery which are provided with a shoe member having an assembling part and which are fitted facing the chain entry side fitting assembly part and the chain delivery side fitting assembly part of the shoe member, respectively. A fixed chain guide for an engine that includes a base plate member having a shoe support portion provided with side fitting notches at both ends, and guides and regulates the travel of the transmission chain,
A fixed chain guide for an engine, wherein the chain entry side fitting notch portion and the chain delivery side fitting notch portion of the base plate member are formed asymmetrically when viewed from the chain width direction.   The fixed chain guide for an engine according to claim 1, wherein the base plate member is provided in the vicinity of a transmission chain that travels between cam sprockets. Either one of the chain entry side fitting notch part and the chain sending side fitting notch part of the base plate member is formed to be larger than the other, and
The chain entry side fitting assembly portion and the chain delivery side fitting assembly portion of the shoe member are concavo-convexly engaged with the chain entry side fitting notch portion and the chain delivery side fitting notch portion, respectively. The fixed chain guide for an engine according to claim 1 or 2, wherein the fixed chain guide is used. Either one of the chain entry side fitting notch part and the chain sending side fitting notch part of the base plate member is formed with a longer width in the chain longitudinal direction than the other, and
The chain entry side fitting assembly portion and the chain delivery side fitting assembly portion of the shoe member are concavo-convexly engaged with the chain entry side fitting notch portion and the chain delivery side fitting notch portion, respectively. The fixed chain guide for an engine according to any one of claims 1 to 3, wherein the fixed chain guide is for an engine. Either one of the chain entry side fitting notch and the chain delivery side fitting notch of the base plate member is formed in a deep groove in the chain width direction than the other,
At the position where the chain entry side fitting assembly portion and the chain delivery side fitting assembly portion of the shoe member are concavo-convexly fitted relative to the chain entry side fitting notch portion and the chain delivery side fitting notch portion, respectively. The fixed chain guide for an engine according to any one of claims 1 to 4, characterized in that it is arranged.

Images