JP2008291888A - Chain shoe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce friction loss during operation of a chain, and to prevent running-on of the chain, in a chain shoe. <P>SOLUTION: The chain shoes 13, 23 are provided on a chain tensioner arm 10 or a chain guide 20, and have a chain sliding surface 30 on which a chain 7 slides. In the chain shoes 13, 23, at both side edge portions of the chain sliding surface 30 of the shoes, standing wall portions 31 regulating swinging in a width direction of the chain7 are formed. On a chain opposite surface of the standing wall portion 31, a tapered surface 31a tilting to a side separating from the chain 7 toward a tip end is formed. An angle α made by the tapered surface 31a to a perpendicular line P raised on the chain sliding surface 30 is set to be 0<α≤20°. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a chain shoe provided on a chain tensioner arm or a chain guide, and more particularly to a standing wall portion that is formed on a chain sliding surface of the shoe and restricts runout in the width direction of the running chain.

  In general, the chain is used by being spanned between a drive sprocket on the driving side and a driven sprocket on the driven side. A slack side span on the side where the chain enters the driven sprocket is formed.

  Normally, a chain guide for guiding the chain travel is provided on the tension side span of the chain, and a chain tensioner arm for applying a tension to the chain is provided on the slack side span of the chain. . These chain guide and chain tensioner arm have a shoe against which the chain abuts.

  The shoe is generally made of a plastic member and has a chain sliding surface on which a running chain slides. The chain sliding surface of the shoe extends in the longitudinal direction, and an upright wall portion that regulates the runout in the width direction of the running chain is formed on the side edge in the width direction.

As a standing wall portion of a conventional shoe, for example, a rectangular cross section shown in FIG. 10 of Japanese Patent Application Laid-Open No. 2002-340113 or FIG. 6 of Japanese Patent Application Laid-Open No. 10-19100, FIG. The thing of the cross-sectional triangle shape as shown in 4 is known. Also known are trapezoidal cross sections as shown in FIG. 5 of JP-A-2002-340113 and FIG. 8 of JP-A-10-19100. Further, FIG. 7 of Japanese Patent Application Laid-Open No. 10-19100 describes a connecting portion between a standing wall portion having a rectangular cross section and a chain sliding surface connected by a curved surface.
Japanese Patent Application Laid-Open No. 2002-340113 (see FIGS. 4, 5 and 10) Japanese Patent Laid-Open No. 10-19100 (see FIGS. 6, 7 and 8)

  In the case of the standing wall portion having a rectangular cross section shown in FIG. 10 of Patent Document 1 and FIG. 6 of Patent Document 2, since the outer surface of the running chain is in surface contact with the standing wall portion, the friction resistance during running of the chain is reduced. There is a problem that the power transmission efficiency of the chain is lowered because the friction loss is large and the friction loss is large.

  On the other hand, in the case of the standing wall portion having a triangular or trapezoidal cross section shown in FIGS. 4 and 5 of Patent Document 1 and FIGS. 7 and 8 of Patent Document 2, the outer surface of the running chain is the standing wall portion. Since the line contact is made, the frictional resistance during the running of the chain can be reduced and the friction loss can be reduced, so that the power transmission efficiency of the chain can be prevented from being lowered.

  However, in paragraph [0052] of the specification of Patent Document 2, “FIG. 7 shows a curved groove shape, and FIG. 8 shows a tapered groove shape. When the chain begins to move laterally during chain operation, the curved and tapered grooves allow the chain to ride on the groove sidewalls. , Maintain the tension of the chain. "

  Here, the inclined surface of the standing wall portion described in FIG. 8 of Patent Document 2 forms an angle of about 45 degrees with respect to the vertical line standing on the chain sliding surface, as shown in FIG. That is, in paragraph [0052] of Patent Document 2, it is clearly described that if the surface of the standing wall on the side of the chain opposite to the chain is a taper surface of about 45 degrees, the chain can ride on the taper surface.

  Such running of the chain decreases the power transmission efficiency of the chain because the sliding resistance of the chain increases with the fluctuation in the width direction of the chain.

  Moreover, in the thing of FIG. 4 of patent document 1, the inclined surface of an upright wall part makes an angle of about 55 degree | times with respect to the perpendicular standing on the chain sliding surface, as shown in the same figure. In the document shown in FIG. 5, the inclined surface of the standing wall portion is at an angle of about 45 degrees with respect to a vertical line standing on the sliding surface of the chain, as shown in FIG. Therefore, in the ones shown in FIGS. 4 and 5 of Patent Document 1, there is a high possibility that the chain rides on the inclined surface of the standing wall portion. In this case, as described above, the chain is shaken in the width direction. , Increase the sliding resistance of the chain and reduce the power transmission efficiency of the chain.

  The present invention has been made in view of such a conventional situation, and a problem to be solved by the present invention is to provide a shoe for a chain that can reduce friction loss during chain operation and prevent the chain from running. There is.

  The chain shoe according to the invention of claim 1 is provided on a chain tensioner arm for applying tension to the chain or a chain guide for guiding the running of the chain, and the chain sliding surface on which the chain slides is provided. Have. A standing wall portion that restricts the runout in the width direction of the chain is formed at the side edge portion in the width direction of the chain sliding surface of the shoe. The standing wall portion has a tapered surface that is inclined to the side away from the chain as it goes to the tip on the side facing the chain, and the angle α formed by the tapered surface with respect to the vertical line that stands on the chain sliding surface is , 0 <α ≦ 20 °.

As shown in FIG. 4, when the chain sliding surface of the shoe is S and the taper surface is T, the pressing force acting on the taper surface T from the chain when the chain on the chain sliding surface S swings in the width direction is shown. F. The condition for preventing the chain from riding on the tapered surface T can be expressed by the following equation.
μN ≧ Fsinα (1)
Where μ is a coefficient of friction between the chain and the shoe, N is a component perpendicular to the taper surface T of the component force of the pressing force F, and α is a taper with respect to a perpendicular P standing on the chain sliding surface S of the shoe. The angle formed by the surface T.

Here, since N = Fcosα, if this is substituted into the equation (1), μFcosα ≧ Fsinα
By arranging this, μ ≧ tan α (2)
It becomes.

Regarding the friction coefficient μ, since the chain is generally a steel member and the shoe is a synthetic resin member and is made of, for example, nylon 66, μ = 0.37, which is the value of the static friction coefficient between steel and nylon 66. Adopted by Bowers & Zisman. Substituting this into equation (2) tan α ≦ 0.37 (3)
It becomes.

Here, since 0 ≦ tan α ≦ 1 at 0 ≦ α ≦ 45 °, the value of α satisfying the expression (3) is α ≦ tan ⁻¹ 0.37.
Solve for α ≦ 20 ° (4)
It becomes. Further, as a precondition for the tapered surface, α> 0, and this is combined with equation (4) to satisfy 0 <α ≦ 20 ° (5)
It becomes.

  According to the first aspect of the present invention, as described above, since the standing wall portion has the tapered surface on the opposite side of the chain, the outer surface of the chain in operation is in line contact with the standing wall portion, whereby the chain operation is performed. Friction resistance can be reduced, and friction loss can be reduced. As a result, a reduction in the power transmission efficiency of the chain can be prevented.

  Furthermore, according to the invention of claim 1, since the inclination angle of the tapered surface formed on the standing wall portion of the shoe is set within the range defined by the above equation (5), the chain is tapered at the start of running of the chain. It can be surely prevented from getting on the surface.

  In the invention of claim 2, the angle α is set in a range of 0 <α ≦ 5 °.

  In the first aspect of the present invention, the value of the static friction coefficient is used as the friction coefficient. However, since the behavior of the chain swinging in the width direction occurs in most cases during the running of the chain, the dynamic friction coefficient is the friction coefficient. A value may be used.

The invention of claim 2 has been made from such a viewpoint, and in the above equation (2), generally known μ = 0.1 is adopted as the value of the dynamic friction coefficient between steel and nylon 66. Tan α ≦ 0.1 (3 ')
It becomes. Solving this, α ≦ tan ⁻¹ 0.1
From α ≦ 5 ° (4 ')
It becomes. Further, as a precondition for the tapered surface, α> 0, and this is combined with the equation (4 ′) to satisfy 0 <α ≦ 5 ° (5 ′)
It becomes.

  According to the invention of claim 2, since the inclination angle of the tapered surface formed on the standing wall portion of the shoe is set within the range defined by the above equation (5 ′), the chain is tapered while the chain is running. It can be surely prevented from getting on.

  The chain shoe according to the invention of claim 3 is provided in a chain tensioner arm for applying tension to the chain or a chain guide for guiding the running of the chain, and the chain sliding surface on which the chain slides is provided. Have. A standing wall portion is formed on the side edge portion in the width direction of the chain sliding surface of the shoe so as to restrict the runout in the width direction of the running chain. The standing wall portion has at least one convex arcuate surface on the side facing the chain.

  According to the invention of claim 3, since the standing wall portion has the convex arc surface on the opposite side of the chain, the outer surface of the running chain is in line contact or point contact with the standing wall portion. The friction resistance inside can be reduced, and friction loss can be reduced. As a result, a reduction in the power transmission efficiency of the chain can be prevented.

  Furthermore, according to the invention of claim 3, since the surface formed on the chain facing side of the standing wall portion of the shoe is a convex arc surface, it is possible to reliably prevent the chain from riding on the convex arc surface.

  In the invention of claim 4, the convex arc surface is in point contact or line contact with the chain.

  In this case, since the outer surface of the running chain is in line contact or point contact with the convex arc surface of the standing wall portion, the frictional resistance during running of the chain can be reduced, and the friction loss can be reduced. As a result, a reduction in the power transmission efficiency of the chain can be prevented.

  In the invention of claim 5, the lower part of the convex arcuate surface is directly connected to the chain sliding surface of the shoe.

  In the invention of claim 6, the lower part of the convex arc surface is connected to the chain sliding surface of the shoe via the concave arc surface.

  In this case, since the convex arc surface is arranged at a position away from the chain sliding surface of the shoe, the convex arc surface is the chain at a portion away from the lower end of the outer surface of the chain. Contact with.

  Thereby, compared with the case where the lower end of the chain outer surface is supported from the chain width direction, the chain can be stably supported.

  In the invention of claim 7, the standing wall portion has two convex arcuate surfaces connected up and down via concave arcuate surfaces.

  In this case, since the chain is supported in the width direction by the two convex arc surfaces separated from each other in the vertical direction, the chain can be supported more stably.

  In the invention of claim 8, the standing wall portion connects the convex arc surface, the concave arc surface connected to the lower portion of the convex arc surface, the lower portion of the concave arc surface, and the chain sliding surface. And a flat surface orthogonal to each other.

  In this case, since the chain is supported in the width direction by the convex arcuate surface and the flat surface separated in the vertical direction, the chain can be supported more stably.

  In the invention of claim 9, the standing wall portion has a portion formed continuously along the longitudinal direction of the chain sliding surface.

  That is, in this case, the standing wall portion of the shoe is composed of one or two (that is, a pair of left and right) standing wall portions extending in the longitudinal direction along one side edge or both side edges of the chain sliding surface. ing.

  In the invention of claim 10, the standing wall portion has a portion formed intermittently along the longitudinal direction of the chain sliding surface.

  That is, in this case, a plurality of standing wall portions are provided in the longitudinal direction along one side edge portion or both side edge portions of the chain sliding surface.

  In the invention of claim 11, the standing wall portion is formed on both side edges in the width direction of the chain sliding surface, and at least a part of each standing wall portion of the both side edges in the width direction is arranged to face in the width direction.

  That is, in this case, at least one pair of left and right standing wall portions provided at both side edges of the chain sliding surface is provided.

  In the invention of claim 12, the standing wall portions are formed at both side edges in the width direction of the chain sliding surface, and none of the standing wall portions at both side edges in the width direction are arranged to face each other in the width direction.

  That is, in this case, the standing wall portions provided at both side edges of the chain sliding surface are arranged in a staggered manner.

  As described above, according to the chain shoe according to the present invention, since the standing wall portion has the tapered surface or the convex arc surface on the opposite side of the chain, the outer surface of the chain in operation is in line contact with the standing wall portion. Alternatively, point contact can be made, whereby the frictional resistance during chain operation can be reduced, and the friction loss can be reduced. As a result, a reduction in the power transmission efficiency of the chain can be prevented. In addition, according to the present invention, since the inclination angle of the tapered surface formed on the standing wall portion of the shoe is set within a predetermined range, or the standing wall portion has an arcuate surface, the chain becomes a tapered surface. It can be surely prevented from getting on.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
1 to 4 are diagrams for explaining a chain shoe according to an embodiment of the present invention. FIG. 1 is a schematic configuration diagram of an engine timing system employing the chain shoe according to the present embodiment. FIG. 3 is a sectional view taken along the line II-II in FIG. 1, FIG. 3 is an enlarged view of the standing wall portion of the chain shoe, and FIG. 4 is a view for explaining the balance of forces acting on the tapered surface of the standing wall portion in FIG. Here, a silent chain will be described as an example of a chain.

  As shown in FIG. 1, the engine timing system includes a crank sprocket 2 attached to a crankshaft 1, cam sprockets 4 and 6 attached to two camshafts 3 and 5, and the sprockets 2 and 4. , 6 and a silent chain 7 laid across. In FIG. 1, an arrow a indicates the rotation direction of the crankshaft 1, and an arrow b indicates the rotation direction of the camshafts 3 and 5.

  A chain tensioner arm 10 for applying a tension to the silent chain 7 is disposed on the slack side span of the silent chain 7. The chain guide 20 is disposed.

  The chain tensioner arm 10 is made of, for example, an aluminum die-cast arm main body 12 pivotally supported by a pin 11 inserted through one end thereof, and is detachably mounted on the arm main body 12 and made of a resin such as nylon 66, for example. And a shoe 13. The piston rod 14 a of the hydraulic tensioner 14 is in contact with the other end of the arm body 12.

  The chain guide 20 is fixed to the engine side via pins 21 inserted through both ends, for example, a guide body 22 made of aluminum die cast, and detachably mounted on the guide body 22 such as nylon 66, for example. And a shoe 23 made of resin.

  As shown in FIG. 2, the shoes 13 and 23 have a chain sliding surface 30 on which the silent chain 7 slides. The silent chain 7 is constructed by laminating a plurality of link plates 70 in the width direction (left and right direction in FIG. 2) and in the longitudinal direction (vertical direction in the drawing), and connecting them in a pivotable manner with connecting pins 71. Has been.

  A pair of left and right standing wall portions 31 for restricting the swing of the silent chain 7 in the width direction are formed at both side edges in the width direction of the chain sliding surface 30 of the shoes 13 and 23. Each standing wall portion 31 has a trapezoidal shape. On the side facing the silent chain 7, the standing wall portion 31 has a tapered surface 31 a that is inclined toward the side away from the silent chain 7 as it goes to the tip.

  As shown in FIG. 3, the taper surface 31 a of the standing wall portion 31 has an angle formed with respect to the perpendicular P standing on the chain sliding surface 30, that is, an included angle α with the perpendicular P within a range of 0 <α ≦ 20 °. Is set. FIG. 3 shows an example in which α = 20 °.

  The reason why the angle α is set in the above range is to prevent the chain 7 from riding on the tapered surface 31 a of the standing wall portion 31.

As shown in FIG. 4, when the chain sliding surface of the shoe is S and the taper surface is T, the pressing force acting on the taper surface T from the chain when the chain on the chain sliding surface S swings in the width direction is shown. F. The condition for preventing the chain from riding on the tapered surface T can be expressed by the following equation.
μN ≧ Fsinα (1)
Where μ is a coefficient of friction between the chain and the shoe, N is a component perpendicular to the taper surface T of the component force of the pressing force F, and α is a taper with respect to a perpendicular P standing on the chain sliding surface S of the shoe. The angle formed by the surface T.

Here, since N = Fcosα, if this is substituted into the equation (1), μFcosα ≧ Fsinα
By arranging this, μ ≧ tan α (2)
It becomes.

Regarding the friction coefficient μ, since the chain is generally a steel member and the shoe is a synthetic resin member and is made of, for example, nylon 66, μ = 0.37, which is the value of the static friction coefficient between steel and nylon 66. Adopted by Bowers & Zisman. Substituting this into equation (2) tan α ≦ 0.37 (3)
It becomes.

Here, since 0 ≦ tan α ≦ 1 at 0 ≦ α ≦ 45 °, the value of α satisfying the expression (3) is α ≦ tan ⁻¹ 0.37.
Solve for α ≦ 20 ° (4)
It becomes. Further, as a precondition for the tapered surface, α> 0, and this is combined with equation (4) to satisfy 0 <α ≦ 20 ° (5)
It becomes.

  By setting the angle α, which is the inclination angle of the tapered surface 31a of the standing wall portion 31 of the shoes 13, 23, within such a range, the chain 7 can be reliably prevented from riding on the tapered surface 31a when the chain 7 starts to run. .

  Further, in this case, since the standing wall portion 31 has the tapered surface 31 a on the chain facing side, the outer surface of the chain 7 during operation is in line contact with the standing wall portion 31. Thereby, the frictional resistance at the time of chain | strand operation can be made small, and a friction loss can be reduced. As a result, a reduction in the power transmission efficiency of the chain can be prevented.

  In the above example, the value of the static friction coefficient is adopted as the friction coefficient μ. However, since the behavior of the chain swinging in the width direction occurs in most cases during the running of the chain, the dynamic friction coefficient is used as the friction coefficient. The value of may be used.

In this case, in the above equation (2), when generally known μ = 0.1 is adopted as the value of the dynamic friction coefficient between steel and nylon 66, tan α ≦ 0.1 (3 ′)
It becomes. Solving this, α ≦ tan ⁻¹ 0.1
From α ≦ 5 ° (4 ')
It becomes. Further, as a precondition for the tapered surface, α> 0, and this is combined with the equation (4 ′) to satisfy 0 <α ≦ 5 ° (5 ′)
It becomes.

  Thus, by setting the angle α of the taper surface 31a of the standing wall portion 31 of the shoes 13 and 23 within the range defined by the above formula (5 ′), the chain 7 is tapered when the chain 7 is running. It can be surely prevented from getting on.

[Other Examples]
In the said Example, although the example which formed the taper surface in the surface at the chain opposing side of the standing wall part 31 of the shoes 13 and 23 was shown, application of this invention is not limited to this. 5 to 9 show various shoes according to other embodiments of the present invention. In these drawings, the same reference numerals as those in the previous embodiment denote the same or corresponding parts.

  In each embodiment shown in FIGS. 5 to 9, at least one convex arc surface is formed on the surface of the standing wall portion 31 of the shoe 13, 23 on the chain facing side. In each figure, reference numeral 7A indicates the outer surface of the outermost plate of the chain 7.

  In the example shown in FIG. 5, a convex arc surface 31 b is formed, and a lower portion of the convex arc surface 31 b is directly connected to the chain sliding surface 30. The chain outer surface 7A is in contact with the lower end of the convex arcuate surface 31b.

  In the example shown in FIG. 6, a convex arc surface 31 b having a smaller radius of curvature than that of FIG. 5 is formed, and a concave arc surface 31 c that connects the lower portion and the chain sliding surface 30 is formed. . The chain outer surface 7A is in contact with a black dot that is the most protruding point of the convex arcuate surface 31b.

  In the example shown in FIG. 7, a convex arc surface 31b having a smaller curvature radius than that of FIG. 6 is formed, and a concave arc surface 31c having a larger curvature radius than that of FIG. The lower part of the concave arc surface 31c is connected to a short flat surface 31d that is orthogonal to the chain sliding surface 30 and extends upward by a slight distance. The chain outer surface 7A is in contact with the convex arc surface 31b and the flat surface 31d.

  The example shown in FIG. 8 is similar to FIG. 7, but is different from the example of FIG. 7 in that a convex arcuate surface 31e is formed instead of the flat surface 31d. The chain outer surface 7A is in contact with the convex arc surface 31b and the convex arc surface 31e.

  In the example shown in FIG. 9, instead of the convex arc surface 31e of FIG. 8, a convex arc surface 31e having a smaller radius of curvature and a concave arc surface 31f having a smaller radius of curvature connected to the lower portion are provided. It has been. The chain outer surface 7A is in contact with the convex arc surface 31b and the convex arc surface 31e.

  According to the shoes shown in FIGS. 5 to 9, since the surfaces formed on the chain facing side of the standing wall portion 31 of the shoes 13 and 23 are the convex arc surfaces 31b and 31e, the chain 7 has the convex arc surface. It can be surely prevented from getting on.

  In the case of the convex arc surface 31b of FIG. 5, the perpendicular line that stands on the chain sliding surface 30 at the lowest point of the convex arc surface 31b is the tangent to the convex arc surface 31b. It can prevent more reliably that it gets on the convex circular arc surface 31b.

  Also, in the case of the convex arc surface 31b of FIGS. 6 to 9, the most protruding point of the convex arc surface 31b is located above the chain sliding surface 30, so that when the chain swings in the width direction, The upper arcuate surface 7A is supported by the convex arcuate surface 31b. Thereby, more stable support becomes possible.

  Further, in the case of FIG. 7 to FIG. 9, the chain is supported in the width direction by two convex arc surfaces 31b and 31e that are vertically separated, or by the convex arc surface 31b and flat surface 31d that are vertically separated. As a result, the chain can be supported more stably.

  In each of the above embodiments, only the cross-sectional shape of the shoe has been described, but the shape of the shoe in the longitudinal direction will be described with reference to FIGS. These drawings all show various planar schematic shapes of the shoe.

  In the example shown in FIG. 10, the standing wall 31 extends continuously along the longitudinal direction of the shoes 13 and 23. The standing wall portion 31 is disposed over a large area in the longitudinal direction of the shoes 13 and 23 and extends parallel to the outer surface 31A of the standing wall portion 31, and in the vicinity of both ends of the shoes 13 and 23. It is comprised from the taper part 31C arrange | positioned and extended in taper shape with respect to the outer side surface 31A of the said standing wall part 31. As shown in FIG.

  In the example shown in FIG. 11, a plurality of standing wall portions 31 are intermittently disposed along the longitudinal direction of the shoes 13 and 23. Further, in this case, the standing wall portions 31 corresponding to the width direction are arranged to face each other.

  The example shown in FIG. 12 is similar to the example shown in FIG. 11, but in this case, the standing wall portions 31 corresponding to the width direction are not arranged to face each other, but are arranged in a staggered manner.

  In the example shown in FIG. 13, the standing wall portion 31 is provided with a plurality of projections 31 b that are hemispherical in plan view. These protrusions 31b have a hemispherical shape when viewed from the chain sliding surface 30 side (see FIG. 5), or have a spherical shape when viewed from the chain sliding surface 30 side (FIG. 6). reference).

  The example of FIG. 10 is applicable to any of the embodiments of FIG. 2 and FIGS. In this case, the chain facing surface of the standing wall 31 of the shoes 13 and 23 is in continuous line contact with the chain outer surface 7A, so that the frictional resistance during chain running can be reduced and the friction loss is reduced. it can. As a result, a reduction in the power transmission efficiency of the chain can be prevented.

  The examples of FIGS. 11 and 12 are applicable to any of the embodiments of FIGS. 2 and 5 to 9. In this case, the chain facing surface of the standing wall 31 of the shoes 13 and 23 intermittently makes line contact with the chain outer surface 7A, thereby reducing the frictional resistance during chain running and reducing the friction loss. it can. As a result, a reduction in the power transmission efficiency of the chain can be prevented. Sliding resistance can be reduced.

  The example of FIG. 13 is applicable to the embodiments of FIGS. In this case, the chain facing surface of the standing wall portion 31 of the shoes 13 and 23 makes point contact with the chain outer surface 7A, so that the frictional resistance during chain running can be further reduced, and the friction loss can be further reduced. . As a result, a reduction in the power transmission efficiency of the chain can be prevented.

1 is a schematic configuration diagram of an engine timing system employing a chain shoe according to an embodiment of the present invention. It is the II-II sectional view taken on the line of FIG. It is an enlarged view of the standing wall part of the shoe for chains of FIG. It is a figure for demonstrating the balance of the force which acts on the taper surface of the standing wall part of FIG. It is a cross-sectional view of a shoe for a chain according to another embodiment of the present invention. It is a cross-sectional view of a shoe for a chain according to another embodiment of the present invention. It is a cross-sectional view of a shoe for a chain according to another embodiment of the present invention. It is a cross-sectional view of a shoe for a chain according to another embodiment of the present invention. It is a cross-sectional view of a shoe for a chain according to another embodiment of the present invention. 1 is a schematic plan view of a chain shoe according to an embodiment of the present invention. It is the plane schematic diagram of the shoe for chains by other examples of the present invention. It is the plane schematic diagram of the shoe for chains by other examples of the present invention. It is the plane schematic diagram of the shoe for chains by other examples of the present invention.

Explanation of symbols

7: Silent chain 10: Chain tensioner arm 13: Shoe 20: Chain guide 23: Shoe 30: Chain sliding surface 31: Standing wall portion 31a: Tapered surface 31b: Convex arc surface

S: Chain sliding surface T: Tapered surface P: Perpendicular

Claims (12)

In a chain shoe having a chain sliding surface on which a chain slides, provided on a chain tensioner arm for applying tension to the chain or a chain guide for guiding the running of the chain,
The chain sliding surface of the shoe is formed with an upright wall portion that restricts the runout in the width direction of the chain, and the upright wall portion reaches the tip on the side facing the chain. Accordingly, the taper has a tapered surface inclined to the side away from the chain, and an angle α formed by the tapered surface with respect to a perpendicular standing on the sliding surface of the chain is set in a range of 0 <α ≦ 20 °. Yes,
Chain shoe characterized by that. In claim 1,
The angle α is set in a range of 0 <α ≦ 5 °,
Chain shoe characterized by that. In a chain shoe having a chain sliding surface on which a chain slides, provided on a chain tensioner arm for applying tension to the chain or a chain guide for guiding the running of the chain,
The chain sliding surface of the shoe is formed with an upright wall portion that regulates the runout in the width direction of the chain, and at least one convex arc is formed on the side of the shoe facing the chain. Have a surface,
Chain shoe characterized by that. In claim 3,
The convex arc surface is in point contact or line contact with the chain;
Chain shoe characterized by that. In claim 4,
The lower part of the convex arc surface is directly connected to the chain sliding surface of the shoe,
Chain shoe characterized by that. In claim 4,
A lower portion of the convex arc surface is connected to the chain sliding surface of the shoe via a concave arc surface;
Chain shoe characterized by that. In claim 3,
The standing wall portion has two convex arc surfaces connected up and down via a concave arc surface,
Chain shoe characterized by that. In claim 3,
The standing wall portion is orthogonal to the chain sliding surface, connecting the convex arc surface, the concave arc surface connected to the lower portion of the convex arc surface, the lower portion of the concave arc surface, and the chain sliding surface. And a flat surface
Chain shoe characterized by that. In claim 1 or 3,
The standing wall portion has a portion formed continuously along the longitudinal direction of the chain sliding surface,
Chain shoe characterized by that. In claim 1 or 3,
The standing wall portion has a portion formed intermittently along the longitudinal direction of the chain sliding surface,
Chain shoe characterized by that. In claim 9 or 10,
The standing wall portion is formed on both side edges in the width direction of the chain sliding surface, and at least a part of each standing wall portion of the both side edges in the width direction is disposed to face the width direction.
Chain shoe characterized by that. In claim 9 or 10,
The standing wall portions are formed on both side edges in the width direction of the chain sliding surface, and none of the standing wall portions of the both side edges in the width direction are disposed to face each other in the width direction.
Chain shoe characterized by that.

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