JP5100709B2 - Chain guide mechanism - Google Patents

Description

  The present invention relates to a chain guide mechanism that holds a transmission chain such as a roller chain suspended endlessly between sprockets provided on each of a crankshaft and a camshaft in an engine room, and holds a tension and a sliding guide by a travel guide shoe, for example. Is.

Conventionally, the cross-sectional shape of the tensioner lever shoe that properly maintains the tension of the transmission chain and the traveling guide shoe of the transmission chain have the same cross-sectional shape over the entire length in the longitudinal direction. For example, in a roller chain, All end surfaces of the pair of outer link plates and inner link plates of the roller chain are slidably pressed over the entire length in the longitudinal direction of the travel guide surface of the travel guide shoe.
The travel guide shoe is attached to a shoe attachment member such as a tensioner lever and a guide member, and maintains its shape.

  In such a chain guide mechanism, in order to reduce running frictional resistance by reducing the sliding area, the cross-sectional shape of the running guide shoe is changed to all outer link plates and inner links of the transmission chain on the entry side and the release side of the transmission chain. A flat guide surface that slides and guides the end surface of the plate is formed, and a convex pressing surface that slides and guides one end surface of either the outer link plate or the inner link plate is formed in the intermediate section between the entry side and the release side. And what connected the flat guide surface and the convex pressing surface by the continuous surface is well-known.

  As shown in FIG. 11, the travel guide shoe 510 of this known chain guide mechanism 500 is attached to a shoe mounting member 550, and a flat guide surface 512 is formed on the entry side and the release side of the travel guide shoe 510. In the middle section, a step guide surface 511 is formed, and on the step guide surface 511, one end surface of either the outer link plate 521 or the inner link plate 522 of the transmission chain 520 is slidably guided.

  Then, the outer link plate 521 and the inner link plate 522 of the transmission chain 520 have the same height, and the step guide surface 511 of the travel guide shoe 510 has a transmission chain 520 on both sides as shown in FIG. A shape in which a convex pressing surface 513 that slides and guides only the end surface of the outer link plate 521 is formed and a concave groove portion 514 is formed in the central portion, or as shown in FIG. It is configured in a shape in which a convex pressing surface 513 that slides and guides only the end surface of the inner link plate 522 of the chain 520 is formed (for example, see Patent Document 1).

Japanese Patent No. 3269011 (page 2, FIG. 2, FIG. 5)

However, since the known chain guide mechanism 500 has the flat guide surface 512 on the entry side and the separation side of the travel guide shoe 510, the reduction of the sliding area is limited.
In addition, since the travel guide shoe 510 has a cross-sectional shape with projections and depressions in the middle portion, there is a problem that distortion is likely to occur during molding or use due to a difference in heat capacity or internal residual stress, and dimensional accuracy deteriorates.

  Furthermore, the sliding surface of the travel guide shoe is all flat, and only the end surface of either the outer link plate or the inner link plate is slid and guided by changing the height of the outer link plate and inner link plate of the transmission chain. However, in this case, only the outer link plate or the inner link plate that is slidably guided repeatedly contacts and disengages from the travel guide shoe, so there is a problem that the impact is large and noise and vibration increase. there were.

  The present invention solves the problems of the prior art as described above. That is, the object of the present invention is to reduce the sliding frictional resistance by reducing the sliding area and to improve the dimensional accuracy of the traveling guide shoe. To provide a chain guide mechanism that is high and that allows a transmission chain and a travel guide shoe to smoothly come into contact with and disengage from each other to reduce noise and vibration.

  The invention according to claim 1 is a chain guide mechanism having a transmission chain having an outer link plate and an inner link plate, and a travel guide shoe for slidingly guiding an end surface of the plate of the transmission chain. The link plate and the inner link plate are composed of plates having different heights, and the travel guide shoe is provided with a convex pressing surface at an end portion on the entry side of the transmission chain so that the outer link plate and the inner link plate are in sliding contact with each other. A step guide surface having different heights, and the step guide surface is configured such that the step gradually decreases from the end portion and is connected to the flat guide surface, and sequentially from the plate in front of the travel when the transmission chain travels The above-mentioned problem is solved by being configured in the shape of contact.

  The invention according to claim 2 is a chain guide mechanism having a transmission chain having an outer link plate and an inner link plate, and a travel guide shoe for slidingly guiding an end surface of the plate of the transmission chain. The link plate and the inner link plate are composed of plates having different heights, and the travel guide shoe is provided with a convex pressing surface at least at the separation side end of the transmission chain so that the outer link plate and the inner link plate slide. It has a step guide surface with different heights on the contact surface, and the step guide surface is configured such that the step gradually decreases from the end and is connected to the flat guide surface. The above-described problems are solved by being configured to be sequentially separated.

  The invention according to claim 3 is a chain guide mechanism having a transmission chain having an outer link plate and an inner link plate, and a travel guide shoe for slidingly guiding an end surface of the plate of the transmission chain. The link plate and the inner link plate are composed of plates having different heights, and the travel guide shoe is provided with convex pressing surfaces at least on the entry side and the release side end portions of the transmission chain, and the outer link plate and the inner link. A step guide surface having different heights on the sliding contact surface of the plate, the step guide surface is configured such that the step gradually decreases from the end portion and is connected to the flat guide surface; The above-mentioned problem is solved by being configured in a shape that sequentially contacts and detaches from the plate.

  In the invention according to claim 4, in addition to the structure of the chain guide mechanism according to any one of claims 1 to 3, the step of the step guide surface is at a position where the transmission chain first contacts. By having a height that is 1/2 or more of the difference in height between the outer link plate and the inner link plate, the above problem is further solved.

  According to the fifth aspect of the present invention, in addition to the structure of the chain guide mechanism according to any one of the first to fourth aspects, the step guide surface has at least two pitches of the transmission chain from the end. The problem is further solved by being provided over the length.

  The chain guide mechanism of the invention according to claim 1 is a chain guide mechanism having a transmission chain having an outer link plate and an inner link plate, and a travel guide shoe for slidingly guiding an end surface of the plate of the transmission chain. The outer link plate and the inner link plate are composed of different height plates, and the travel guide shoe has a convex pressing surface at the end of the transmission chain on the entry side to provide a sliding contact surface between the outer link plate and the inner link plate. It has a step guide surface with different height, and the step guide surface is configured so that the step gradually decreases from the end and is connected to the flat guide surface, and it is shaped so as to contact sequentially from the plate in front of the travel when the transmission chain travels By being configured, only one of the outer link plate or the inner link plate covers almost the entire surface of the travel guide shoe. The contact area is reduced, the frictional resistance is reduced, the cross-sectional shape of the travel guide shoe is reduced, the dimensional accuracy is increased, and the transmission chain to the travel guide shoe is improved. Since the outer link plate and the inner link plate are alternately contacted at the time of approach, they can be smoothly contacted to reduce noise and vibration.

  The chain guide mechanism of the invention according to claim 2 is a chain guide mechanism having a transmission chain having an outer link plate and an inner link plate, and a travel guide shoe for slidingly guiding an end surface of the plate of the transmission chain. The outer link plate and the inner link plate are made of plates having different heights, and the travel guide shoe is provided with a convex pressing surface at least at the end of the transmission chain on the disengagement side, and the sliding surface of the outer link plate and the inner link plate The step guide surface has different heights, and the step guide surface is configured such that the step gradually decreases from the end and is connected to the flat guide surface, and the shape is such that it is sequentially detached from the front plate during travel of the transmission chain. By configuring the outer link plate or the inner link plate over almost the entire surface of the travel guide shoe, Since only one of them is in sliding contact, the sliding area is reduced and the running frictional resistance is reduced, and the cross-sectional shape portion with the unevenness of the running guide shoe is reduced and the dimensional accuracy can be increased. When the transmission chain is detached, the outer link plate and the inner link plate are alternately separated from each other, so that they are smoothly separated and noise and vibration are reduced.

  A chain guide mechanism according to a third aspect of the present invention is a chain guide mechanism having a transmission chain having an outer link plate and an inner link plate, and a travel guide shoe for slidingly guiding an end surface of the plate of the transmission chain. The outer link plate and the inner link plate are composed of plates having different heights, and the travel guide shoe is provided with convex pressing surfaces at least on the entry side end and the release side end of the transmission chain, and the outer link plate and the inner link. The plate has a step guide surface with different slidable contact surfaces, and the step guide surface is configured such that the step gradually decreases from the end and is connected to the flat guide surface. The outer link plate covers almost the entire surface of the travel guide shoe. Since only one of the inner link plates is in sliding contact, the sliding area is reduced and the running frictional resistance is reduced, and the cross-sectional shape portion with the unevenness of the running guide shoe is reduced, and the dimensional accuracy can be increased, and When the transmission chain enters the travel guide shoe and when the transmission chain is detached from the travel guide shoe, the outer link plate and the inner link plate come in contact with each other in turn and come into contact with each other. Reduced.

  The chain guide mechanism according to the fourth aspect of the invention has the effect of the chain guide mechanism according to any one of the first to third aspects, in addition to the effect that the step of the step guide surface first contacts the transmission chain. By having a height that is 1/2 or more of the difference in height between the outer link plate and the inner link plate, the outer link plate and the inner link plate can be reliably used even if subtle changes in the transmission chain vibration or entry angle occur. Are in contact with each other one after the other, making contact and separation even smoother, reducing noise and vibration.

  The chain guide mechanism according to the fifth aspect of the present invention has the effect that the step guide surface has two pitches or more of the transmission chain from the end in addition to the effect exhibited by the chain guide mechanism according to any one of the first to fourth aspects. By being provided over the length, the relative angle between the travel guide shoe and the transmission chain at the time of contact start and release becomes smaller, and the contact and release are made more smoothly and noise and vibration are reduced.

Explanatory drawing of the usage form of the chain guide mechanism of this invention. The side view of the travel guide shoe and shoe attachment member of the chain guide mechanism which is one Example of this invention. FIG. 3 is a perspective view of a step guide surface of the travel guide shoe of FIG. 2. FIG. 4 is a cross-sectional view of a transmission chain in FIG. 3. The perspective view of the level | step difference guide surface of the traveling guide shoe of the other Example of FIG. FIG. 6 is a cross-sectional view of the transmission chain in FIG. 5. Operation | movement explanatory drawing of the chain guide mechanism which is one Example of this invention. Operation | movement explanatory drawing of the chain guide mechanism which is one Example of this invention. Operation | movement explanatory drawing of the chain guide mechanism which is one Example of this invention. Operation | movement explanatory drawing of the chain guide mechanism which is one Example of this invention. The side view of the travel guide shoe and shoe attachment member of the conventional chain guide mechanism. Sectional drawing of FIG.

  The present invention relates to a chain guide mechanism having a transmission chain having an outer link plate and an inner link plate, and a travel guide shoe for slidingly guiding an end surface of the plate of the transmission chain, wherein the outer link plate and the inner link plate of the transmission chain are It is composed of plates with different heights, and the travel guide shoe is provided with a convex pressing surface at the entrance side end and / or the release side end of the transmission chain so that the sliding contact surfaces of the outer link plate and the inner link plate have different heights. The step guide surface has a small step, and the step guide surface gradually decreases from the end and is connected to the flat guide surface. It is configured to reduce the sliding area by reducing the sliding area, the dimensional accuracy of the traveling guide shoe is high, and the traveling with the transmission chain. A guide shoe smoothly contact or disengagement, as long as the effect of reducing noise and vibration, specific embodiments thereof are may any be any one.

That is, the travel guide shoe of the chain guide mechanism of the present invention may be provided on a movable guide member such as a tensioner lever or may be provided on a fixed guide member.
Further, the guide member may be detachably provided or may be integrally formed with the guide member.

  In addition, the material for the travel guide shoe of the chain guide mechanism of the present invention may be any material as long as it has a low frictional resistance with the transmission chain. In particular, it exhibits durability in a high temperature environment and transmission. A material capable of achieving smooth sliding contact of the chain is suitable. For example, a material such as a synthetic resin material such as polyamide 6 resin, polyamide 46 resin, polyamide 66 resin, or polyacetal resin is preferably used.

Below, the chain guide mechanism which is an Example of this invention is demonstrated based on drawing.
The chain guide mechanism 100 of the present invention is used for a chain guide of a transmission chain of an engine timing system, for example.
As shown in FIG. 1, the engine timing system uses a transmission chain 120 that is endlessly suspended between a drive sprocket S1 attached to a crankshaft in an engine room and a pair of driven sprockets S2 and S3 attached to a camshaft. The tensioner lever T that guides the transmission chain 120 while properly maintaining the tension of the transmission chain 120 is pressed against the fixed guide member G that guides the traveling of the transmission chain 120.

  The tensioner lever T is swingably attached to the engine room by a mounting shaft B, is pressed and urged by a plunger P in a housing fixed to the engine room by a mounting member F, and the fixed guide member G is attached to the engine room. It is fixed by mounting shafts B1 and B2.

  A chain guide mechanism 100 according to an embodiment of the present invention is used for the above-described fixed guide member G, and a travel guide shoe 110 is attached to a chain pressing surface side of a shoe attachment member 150 as shown in FIG. The chain running surface side is configured such that both end portions are step guide surfaces 111 and the center portion is a flat guide surface 112.

  When the inner link plate 122 of the transmission chain 120 is taller than the outer link plate 121, the step guide surface 111 has only the end surface of the outer link plate 121 of the transmission chain 120 on both sides as shown in FIGS. A convex pressing surface 113 that slides and guides is formed, a concave groove portion 114 is formed at the center, and the step between the convex pressing surface 113 and the concave groove portion 114 gradually decreases toward the flat guide surface 112 and is smooth. It is formed so as to be connected to the flat guide surface 112.

  When the outer link plate 121 of the transmission chain 120 is taller than the inner link plate 122, only the end surface of the inner link plate 122 of the transmission chain 120 is slidably guided to the center as shown in FIGS. Convex pressing surface 113 is formed and concave portions 115 are formed on both sides, and the level difference between convex pressing surface 113 and concave portion 115 gradually decreases toward flat guiding surface 112 and smoothly connects to flat guiding surface 112. It is formed to do.

Next, the operation when the transmission chain 120 enters the step guide surface 111 of the travel guide shoe 110 in the chain guide mechanism 100 according to the embodiment of the present invention will be described.
In this example of operation, the inner link plate 122 of the transmission chain 120 is taller than the outer link plate 121, and the step guide surface 111 is a convex pusher that slides and guides only the end surface of the outer link plate 121 of the transmission chain 120 on both sides. A contact surface 113 is formed, a concave groove portion 114 is formed at the center, and a step between the convex pressing surface 113 and the concave groove portion 114 is gradually reduced toward the flat guide surface 112 so that the flat guide surface 112 is smoothly connected. It is formed to do.

  First, as shown in FIG. 7, when the chain runs in the direction of the arrow from the state in which the inner link plate 122A is in sliding contact with the concave groove 114 of the step guide surface 111, the outer link plate 121B is stepped as shown in FIG. It contacts the convex pressing surface 113 of the guide surface 111.

  When the chain further travels in the direction of the arrow, as shown in FIG. 9, the inner link plate 122C comes into contact with the concave groove portion 114 of the step guide surface 111, and when the chain travels in the direction of the arrow, as shown in FIG. The link plate 121D contacts the convex pressing surface 113 of the step guide surface 111.

  At this time, after the inner link plate 122C comes into contact with the concave groove portion 114 of the step guide surface 111, the outer link plate preceding the outer link plate 121D comes into contact with the convex pressing surface 113 of the step guide surface 111. 121B separates from the convex pressing surface 113 of the step guide surface 111.

That is, the inner link plate 122 and the outer link plate 121 sequentially contact the step guide surface 111 from the front plate in the traveling direction, and the tall inner link plate 122 continues sliding contact after contact with the step guide surface 111. The short outer link plate 121 is detached after the subsequent inner link plate 122 contacts the step guide surface 111.
In addition, the inner link plate 122 and the outer link plate 121 operate in the reverse manner to the above contact / disengagement by forming the traveling guide shoe 110 on the side away from the transmission chain 120 in the same shape.

As a result, when the transmission chain 120 enters and leaves the travel guide shoe 110, the outer link plate 121 and the inner link plate 122 are alternately brought into contact with and separated from each other to reduce noise and vibration, and the travel guide shoe. Since only the inner link plate 122 is in sliding contact over almost the entire surface of 110, the sliding area is reduced and the running frictional resistance is reduced.
Further, since the step guide surface 111 of the travel guide shoe 110 only needs to be in the vicinity of both ends, the uneven cross-sectional shape portion is reduced and the dimensional accuracy can be increased.

Note that the dimensional relationship in each figure is exaggerated or deformed for the sake of explanation, and the height of the step between the convex pressing surface 113 of the step guide surface 111 and the concave groove 114 (concave 115) is first transmitted. It is preferable that the height of the outer link plate 121 and the inner link plate 122 is not less than ½ of the height difference at the position where the chain 120 contacts.
By doing so, the outer link plate 121 and the inner link plate 122 are alternately contacted and detached in order even if a subtle change occurs in the vibration or the approach angle of the transmission chain 120. Noise and vibration are reduced.

  Further, it is preferable that the step guide surface 111 is provided from the end portion over a length of two pitches or more of the transmission chain 120, so that the travel guide shoe 110 and the transmission chain at the time of contact start / release are provided. The relative angle of 120 becomes smaller, and the contact and detachment are made more smoothly and noise and vibration are reduced.

  As described above, according to the present invention, since only one of the outer link plate or the inner link plate is in sliding contact over almost the entire surface of the traveling guide shoe, the sliding area is reduced and the traveling frictional resistance is reduced. , The cross-sectional shape with unevenness of the travel guide shoe can be reduced, and the dimensional accuracy can be increased, and the outer link plate and the inner link plate contact each other in turn when the transmission chain enters and leaves the travel guide shoe. -Since it is detached, the effect is enormous, such as smooth contact and separation and reduced noise and vibration.

  Note that the chain that the chain guide mechanism of the present invention is in sliding contact with may be a bush chain or a silent chain. In the case of a silent chain, a plurality of link plates are almost densely arranged in the width direction. The contact surface 113 and the concave groove 114 (recess 115) are formed in a comb shape.

100, 500 ... Chain guide mechanisms 110, 510 ... Travel guide shoes 111, 511 ... Step guide surfaces 112, 512 ... Flat guide surfaces 113, 513 ... Convex pressing surfaces 114, 514 ... Dove groove 115 ... Recess 120,520 ... Transmission chain 121,521 ... Outer link plate 122,522 ... Inner link plate 150,550 ... Shoe mounting

Claims (5)

In a chain guide mechanism having a transmission chain having an outer link plate and an inner link plate, and a travel guide shoe for slidingly guiding an end surface of the plate of the transmission chain,
The outer link plate and the inner link plate of the transmission chain are composed of plates having different heights,
The travel guide shoe has a step guide surface provided with a convex pressing surface at the end portion on the entry side of the transmission chain, and the sliding contact surfaces of the outer link plate and the inner link plate having different heights;
The step guide surface is configured such that the step gradually decreases from the end portion and is connected to the flat guide surface, and is configured in a shape that sequentially contacts the plate in front of the travel when the transmission chain travels. Chain guide mechanism. In a chain guide mechanism having a transmission chain having an outer link plate and an inner link plate, and a travel guide shoe for slidingly guiding an end surface of the plate of the transmission chain,
The outer link plate and the inner link plate of the transmission chain are composed of plates having different heights,
The travel guide shoe has a step guide surface provided with a convex pressing surface at an end portion on the separation side of the transmission chain so that the sliding contact surfaces of the outer link plate and the inner link plate have different heights;
The step guide surface is configured such that the step gradually decreases from the end portion and is connected to the flat guide surface, and is configured to be sequentially separated from the plate in front of the travel when the transmission chain travels. Chain guide mechanism. In a chain guide mechanism having a transmission chain having an outer link plate and an inner link plate, and a travel guide shoe for slidingly guiding an end surface of the plate of the transmission chain,
The outer link plate and the inner link plate of the transmission chain are composed of plates having different heights,
The travel guide shoe has a step guide surface provided with convex pressing surfaces on the entry side and separation side end portions of the transmission chain, and the sliding contact surfaces of the outer link plate and the inner link plate having different heights;
The step guide surface is configured such that the step gradually decreases from the end portion and is connected to the flat guide surface, and is configured to sequentially contact and disengage from the traveling front plate during traveling of the transmission chain. Chain guide mechanism.   The step of the step guide surface has a height that is 1/2 or more of a difference in height between the outer link plate and the inner link plate at a position where the transmission chain first contacts. Item 4. The chain guide mechanism according to Item 3.   The chain guide mechanism according to any one of claims 1 to 4, wherein the step guide surface is provided over a length of two pitches or more of the transmission chain from an end portion.

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