JP2013108612A - Chain guide - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chain guide, which is included in a chain transmission device and suppresses noise and wear caused by contact with an adjacent member.SOLUTION: In the chain transmission device, a movable guide 100, which guides a transmission chain 13 traveling at a position intersecting a virtual plane P1 and is biased by a chain tensioner, is disposed at a position close to a fixed guide 270, which guides another transmission chain 23 other than the first transmission chain 13 and is adjacent in an axial direction, and forming an overlapping region to overlap with the fixed guide 270 in a view from the axial direction. The movable guide 100 has a projection 150, which is formed of a synthetic resin on a counter face 111 axially opposing to the fixed guide 270 while axially protruding toward the fixed guide 270 in the overlapping region. When the movable guide 100 tilts with respect to the virtual plane P1 while the chain transmission device is operated, the movable guide comes into contact with the fixed guide 270 via the projection 150.

Description

  The present invention relates to a chain transmission device including a transmission chain, and more particularly to a chain guide that is provided in the chain transmission device and guides a transmission chain that is wound around a sprocket and travels. And a chain transmission is a timing chain transmission with which an engine is provided, for example.

  A chain transmission device includes a transmission chain wound around a sprocket, and a chain guide that guides a transmission chain that travels at a position intersecting with a virtual plane orthogonal to the rotation axis of the sprocket, the chain guide being attached to the rotation axis. It is known that it is arranged in the vicinity of a second chain guide as an adjacent member adjacent in the parallel axial direction and at a position where a superposed region overlapping with the second chain guide is formed when viewed from the axial direction. (For example, refer to Patent Document 1).

JP 2003-20952 A (paragraphs 0043-0048, FIG. 2)

  In relation to the above-described conventional chain transmission device, FIG. 13 is a chain guide for guiding a transmission chain 510 that travels at a position intersecting with a virtual plane P5 orthogonal to the rotation axis of the sprocket in the chain transmission device 500. A movable guide 511 and a fixed guide 521, which is a second chain guide for guiding a second transmission chain 520 different from the transmission chain 510, are close to each other in the axial direction parallel to the rotation axis, and viewed from the axial direction. When the chain transmission device 500 is operated, the transmission chain 510 is caused by slight meandering of the transmission chain 510 when the chain transmission device 500 is operated. When a force in the axial direction acts on the movable guide 511 as shown in FIG. Movable guide 511 is relative to the fixed guide 521, the inclined state inclined with respect to the imaginary plane P5, in this example, it may be inclined state in which the movable guide 510 is inclined with respect to the imaginary plane P occurs.

  In this inclined state, for example, when the movable guide 511 is configured to swing by being urged by a chain tensioner (not shown) that applies tension to the transmission chain 510, the chain transmission device 500 is provided. This occurs when a gap is formed between the movable guide 511 and the support shaft in order to swingably support the movable guide 511 on a support shaft provided in the main body (for example, the engine main body of the engine). .

  When such an inclined state occurs between the movable guide 511 and the fixed guide 521, the movable guide 511 contacts or collides with the fixed guide 521 (hereinafter simply referred to as “contact” including the collision). In other words, there is a problem that noise is generated, or that the guides 511 and 521 are worn due to repeated contact or the swinging of the movable guide 511 while the both guides 511 and 521 are in contact with each other.

Further, when a tilted movable guide 511 is caught by the fixed guide 521 and a fixed state where the movable guide 511 cannot swing is generated, the tension of the transmission chain 510 by the movable guide 511 that is oscillated by the chain tensioner is swung. There was a problem that adjustment became difficult.
In addition, the above-described noise and wear caused by the movable guide 511 being in the inclined state are not limited to the case where the adjacent member is the fixed guide 521, and the case where the adjacent guide is a movable guide different from the movable guide 511. Also occurs in the case of the engine body.

  The present invention solves the above-described problems, and an object of the present invention is to provide a chain guide that is provided in a chain transmission device and that suppresses noise and wear caused by contact with adjacent members. .

  First, the invention according to claim 1 is provided in a chain transmission device including a transmission chain wound around a sprocket rotatable around a rotation axis, and travels at a position intersecting with a virtual plane orthogonal to the rotation axis. A chain guide for guiding a transmission chain, in the vicinity of an adjacent member adjacent in an axial direction parallel to the rotation axis, and at a position where a superposition region overlapping with the adjacent member as viewed from the axial direction is formed. In the arranged chain guide, a guide body having a chain running surface with which the traveling transmission chain is in sliding contact and an opposing surface facing the adjacent member in the axial direction, and the axial direction in the overlapping region in the axial direction. Projecting toward the adjacent member, provided on the facing surface and having a projection formed of synthetic resin, When the chain transmission device is in operation, an inclined state that is relatively inclined with respect to the imaginary plane with the adjacent member is generated. It solves the problem.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect of the invention, the guide body includes a shoe having the chain running surface, and a base as a rigid portion that supports the shoe, The projecting portion and the shoe are formed by integral molding of synthetic resin, and the projecting portion is orthogonal to the longitudinal direction of the guide on the facing surface, and from the shoe in the orthogonal direction on the base. The above-mentioned problem is solved by the protrusion extending to the end opposite to the shoe.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect of the present invention, the projecting portion protrudes in an arc shape in the axial direction and is orthogonal to the longitudinal direction of the guide on the facing surface. The above-mentioned problem is solved by the protrusion extending in the orthogonal direction.

  According to a fourth aspect of the present invention, in addition to the configuration of the first aspect of the present invention, the protrusion is communicated with the chain travel surface and attached to the chain travel surface. The above-mentioned problem is solved by providing an oil groove for guiding the lubricating oil.

  According to a fifth aspect of the invention, in addition to the configuration of the fourth aspect of the invention, the guide body has a pad having a contact surface with which a plunger of a chain tensioner abuts, and the oil groove is made of lubricating oil. By reaching the contact surface so as to be guided to the contact surface, the above-described problems are solved.

  According to a sixth aspect of the invention, in addition to the configuration of the first aspect of the invention according to any one of the first to third aspects, the protrusion is a partial cylindrical wall forming a hollow portion. It solves the aforementioned problems.

  According to a seventh aspect of the invention, in addition to the configuration of the invention according to any one of the first to third aspects, the protrusion protrudes in the axial direction from a position separated in the longitudinal direction of the guide, A pair of arcuate walls that are curved so as to approach each other in the longitudinal direction of the guide as they protrude, and the tip of one arcuate wall forms a gap with the other arcuate wall, or the other The above-mentioned problem is solved by being in contact with the arcuate wall.

  Therefore, the chain guide of the present invention is provided in a chain transmission device including a transmission chain wound around a sprocket that can rotate around a rotation axis, and a transmission chain that travels at a position that intersects a virtual plane orthogonal to the rotation axis. The chain guide is disposed near the adjacent member adjacent in the axial direction parallel to the rotation axis and at the position where the overlapping region is formed overlapping the adjacent member when viewed from the axial direction. Since it is disposed close to the adjacent member in the axial direction, not only can the transmission chain be compactly disposed in the axial direction with respect to the adjacent members that together form the overlapping region, but the present invention as described below can be used. Has a unique effect.

  That is, according to the chain guide of the present invention according to claim 1, the guide main body having a chain traveling surface with which the traveling transmission chain is slidably contacted and an opposing surface facing the adjacent member in the axial direction, and the axis in the overlapping region Projecting toward the adjacent member in the direction and having a projection formed on the opposing surface and made of synthetic resin, and relative to the virtual plane between the adjacent member during operation of the chain transmission device When an inclined inclination state occurs, the chain guide and the adjacent member are in an inclined state in which a relative inclination is generated between the chain guide and the adjacent member by first contacting the adjacent member at the protrusion. At the time of contact, in the chain guide, the synthetic resin protrusion first comes into contact with the adjacent member (including collision), so the guide body and the adjacent member come into contact first. Compared to the above, based on the fact that the protrusion has elasticity based on synthetic resin, the buffer effect produced by the protrusion can suppress the noise generated due to the contact between the chain guide and the adjacent member, Furthermore, since the protrusion is made of synthetic resin, it is possible to suppress or prevent the wear of the chain guide and the adjacent member due to the contact between the chain guide and the adjacent member.

  According to the chain guide of the present invention according to claim 2, in addition to the effect produced by the invention according to claim 1, the guide body includes a shoe having a chain traveling surface with which the traveling transmission chain is in sliding contact, and the shoe. And a base part as a rigid part to be supported, and the protrusion part and the shoe are formed by integral molding of synthetic resin, and the protrusion part is formed on the opposing surface from the shoe in a direction orthogonal to the longitudinal direction of the guide. Since the protrusions extend in the orthogonal direction to the end opposite to the shoe in the base, the protrusion is integrally formed with the shoe, so the number of parts is reduced and the cost of the chain guide is reduced. In addition, since the protrusion extends across the base in the orthogonal direction from the shoe to the end of the base, the chain guide and the adjacent member are relatively displaced in the orthogonal direction. Kinimo, guide body and it is possible to prevent contact and caught with an adjacent member.

  According to the chain guide of the present invention according to claim 3, in addition to the effect exhibited by the invention according to claim 1 or claim 2, the projecting portion protrudes in an arc shape in the axial direction and is guided on the opposing surface. By being a ridge extending in the orthogonal direction orthogonal to the longitudinal direction, even when the chain guide is inclined around the orthogonal direction with respect to the imaginary plane, the adjacent member comes into contact with the protrusion at the smooth arc-shaped portion. With respect to the virtual plane, it is possible to suppress noise and wear due to contact while reducing the dependence on the inclination angle of the chain guide around the orthogonal direction, and it is also possible to suppress wear generated on the protrusion. .

  According to the chain guide of the present invention according to claim 4, in addition to the effect exerted by the invention according to any one of claims 1 to 3, the projecting portion communicates with the chain travel surface to travel the chain. By providing an oil groove that guides the lubricating oil adhering to the surface, wear at the contact portion of the adjacent member with the protrusion due to the lubricant guided from the chain running surface through the oil groove to the protrusion. Can be suppressed, and wear at the protrusions can be further suppressed.

  According to the chain guide of the present invention according to claim 5, in addition to the effect exhibited by the invention according to claim 1 or 2, the guide body has a pad having a contact surface with which the plunger of the chain tensioner contacts. Since the oil groove reaches the contact surface so that the lubricating oil is guided to the contact surface, the lubricating oil on the chain running surface is supplied to the contact surface via the oil groove. Wear can be suppressed. In addition, when the plunger and the pad are in contact with each other, the air sandwiched between the plunger and the contact surface is released from between the plunger and the contact surface through the oil groove, so that the air is compressed by the plunger and the contact surface. Thus, noise caused by the outflow of compressed air between the plunger and the contact surface can be prevented.

  According to the chain guide of the present invention according to claim 6, in addition to the effect exhibited by the invention according to any one of claims 1 to 3, a partial cylindrical shape in which the protruding portion forms a hollow portion Since the hollow portion is formed due to the wall, the rigidity of the protruding portion is reduced, and the flexibility due to elastic deformation at the protruding portion is increased, so that the protruding portion bends when colliding with an adjacent member. As a result, the impact caused by the collision between the protrusion and the adjacent member is reduced, and noise caused by the collision can be reduced.

  According to the chain guide of the present invention according to claim 7, in addition to the effect exerted by the invention according to any one of claims 1 to 3, the protruding portion is axially moved from the position separated in the longitudinal direction of the guide. A pair of arcuate walls that are curved so as to approach each other in the longitudinal direction of the guide as they protrude, and the tip of one arcuate wall forms a gap with the other arcuate wall, Alternatively, since the protrusions are a pair of arcuate walls that are separated in the guide longitudinal direction by being in contact with the other arcuate wall, flexibility due to elastic deformation of the protrusions due to collision with an adjacent member is increased. Therefore, the buffering effect by the protruding part is improved, and the noise reducing effect by the protruding part at the time of collision between the protruding part and the adjacent member can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS The whole Example of the chain transmission device which showed 1st Example of this invention and was seen from the axial direction. The perspective view of the movable guide of the chain transmission apparatus of FIG. III-III sectional view taken on the line of FIG. IV-IV sectional view taken on the line of FIG. The figure of the principal part in the V arrow view of FIG. Sectional drawing equivalent to FIG. 4 for demonstrating the inclination state of the movable guide of the chain transmission of FIG. The figure which shows 2nd Example of this invention and corresponds to FIG. 2 of the movable guide of a chain transmission. FIG. 6 is a diagram corresponding to FIG. 5 in the second embodiment. The figure which shows 3rd Example of this invention and corresponds to FIG. 2 of the movable guide of a chain transmission. FIG. 6 is a diagram corresponding to FIG. 5 in the third embodiment. The figure of the principal part equivalent to FIG. 2 of the movable guide of a chain transmission device which shows 4th Example of this invention. The figure of the principal part corresponded in FIG. 4 in 4th Example. Sectional drawing equivalent to FIG. 4 for demonstrating the prior art and demonstrating the inclination state of the movable guide of a chain transmission.

  A chain guide according to the present invention is provided in a chain transmission device including a transmission chain wound around a sprocket rotatable around a rotation axis, and guides the transmission chain traveling at a position intersecting with a virtual plane perpendicular to the rotation axis. In addition, the transmission chain is disposed near the adjacent member adjacent in the axial direction parallel to the rotation axis and at the position where the overlapping region is formed overlapping the adjacent member when viewed from the axial direction. A guide body having a chain running surface that is in sliding contact with an opposing surface that faces an adjacent member in the axial direction, and is formed of a synthetic resin that protrudes toward the adjacent member in the axial direction in the overlapping region and is formed on the opposing surface. When the chain transmission is activated, an inclined state is generated that is relatively inclined with respect to the virtual plane between adjacent members. As long as the noise and wear caused by contact with the adjacent member are suppressed by first contacting the adjacent member at the protrusion, any specific mode may be used. I do not care.

In the present invention, “adjacent” refers to a predetermined interval at which the chain guide and the adjacent member can come into contact with each other when at least one of the chain guide and the adjacent member is inclined during operation of the chain transmission device. This means that the chain guide and the adjacent member are separated in the axial direction.
In the present invention, the “contact” between the chain guide and the adjacent member includes a collision between the chain guide and the adjacent member.
Both the chain guide and the adjacent member may have synthetic resin protrusions, and in this case, the protrusions may contact each other.
In the present invention, when the chain transmission is operated, the inclined state that is relatively inclined with respect to the virtual plane with respect to the adjacent member means a state in which at least one of the chain guide and the adjacent member is inclined with respect to the virtual plane.

  In the present invention, when the chain guide is a movable guide that is supported movably in a state in which an inclined state can occur in a guide support portion provided in a main body of a machine including a chain transmission device, the adjacent member is a transmission chain. An inclined state occurs in a fixed guide provided to guide a transmission chain different from the guide chain and fixed to the main body of the machine, or a guide support portion different from the guide support portion provided in the main body of the machine. A movable guide separate from the transmission chain, or a main body of the machine, which is movably supported in an obtained state and guides the other transmission chain.

  Further, in the present invention, when the chain guide is a fixed guide provided to be fixed to the main body of the machine including the chain transmission device, the adjacent member is inclined in the guide support portion provided in the main body of the machine. It is a movable guide that is supported so as to be movable in a possible state and guides a transmission chain different from the transmission chain.

The movable guide is, for example, a movable guide that is moved by being urged by a chain tensioner that applies tension to the transmission chain.
The chain transmission device including the chain guide of the present invention may be provided in any of an engine and a machine other than the engine (for example, a transport device).

Embodiments of the present invention will be described below with reference to FIGS.
1 to 6 are diagrams for explaining a first embodiment of the present invention.
Referring to FIG. 1, in a first embodiment of the present invention, a chain transmission 1 is a timing chain transmission that is provided in an engine 30 that is an internal combustion engine as a machine and drives a valve gear of the engine 30. is there. The engine 30 is, for example, a V-type engine including first and second banks 32 and 33, and is mounted on an automobile.

  The chain transmission 1 is lubricated by lubricating oil supplied from a lubricating oil supply device (not shown) of the engine 30. The entire chain transmission device 1 is housed in a chain chamber, which is a space formed by an engine body 31 including a cylinder block or the like and is filled with an oil atmosphere.

  The chain transmission device 1 is provided on each of a pair of valve-operated camshafts 34 as first driven rotating members disposed in a first bank 32 that is a first portion of an engine main body 31 as a main body of the engine 30. A pair of first driven sprockets 12 and a first chain transmission mechanism 10 including a first transmission chain 13 wound around each first driven sprocket 12 and a second bank 33 which is a second part of the engine body 31 are arranged. A second chain transmission comprising a pair of second driven sprockets 22 provided on a pair of valve cam shafts 35 as second driven rotating members, and a second transmission chain 23 wound around each second driven sprocket 22. And a mechanism 20.

  The first chain transmission mechanism 10 is provided on a crankshaft 36 as a first drive rotating member of the engine 30 in addition to the first transmission chain 13 and each first driven sprocket 12 and is driven to rotate by the crankshaft 36. The first drive sprocket 11 (shown by broken lines in FIG. 1) and the first chain that guides the first transmission chain 13 that travels to transmit the driving force of the crankshaft 36 to each camshaft 34 on its slack side. The first movable guide 100 as a guide, the first fixed guide 170 as a first chain guide for guiding the traveling first transmission chain 13 on its tight side, and the first transmission by energizing the first movable guide 100. And a first chain tensioner 190 that applies tension to the chain 13.

  The second chain transmission mechanism 20, which is a chain transmission mechanism different from the first chain transmission mechanism 10, includes a crank as a second drive rotating member of the engine 30 in addition to the second transmission chain 23 and each second driven sprocket 22. The second drive sprocket 21 provided on the shaft 36 and driven to rotate by the crankshaft 36 and the second transmission chain 23 that travels to transmit the driving force of the crankshaft 36 to each camshaft 35 are on its slack side. A second movable guide 200 as a second chain guide for guiding, a second fixed guide 270 as a second chain guide for guiding the traveling second transmission chain 23 on its tight side, and biasing the second movable guide 200 And a second chain tensioner 290 that applies tension to the second transmission chain 23.

The drive sprockets 11 and 21 are rotatable about the rotation axis L6 of the crankshaft 36, and the driven sprockets 12 and 22 are rotatable about the rotation axes L4 and L5 of the cam shafts 34 and 35. .
And the 1st transmission chain 13 makes the said 1st specific rotation axis line by using any one rotation axis L4, L6 in the 1st chain transmission mechanism 10, for example, the rotation axis L6 of the crankshaft 36 as a 1st specific rotation axis. The vehicle travels at a position that intersects the first virtual plane P1 (an example of the first virtual plane P1 is shown in FIGS. 3 to 5) orthogonal to the first virtual plane P1.
On the other hand, the second transmission chain 23 has one of the rotation axes L5 and L6, for example, the rotation axis L6 in the second chain transmission mechanism 20 as the second specific rotation axis, with respect to the first virtual plane P1 in the axial direction. The vehicle travels at a position intersecting with the second virtual plane P2 (an example of the second virtual plane P2 is shown in FIGS. 3 to 5) that is separated from each other and orthogonal to the second specific rotation axis.
The rotation axes L4 to L6 are parallel to each other, and therefore the first and second virtual planes P1 and P2 are parallel to each other.

Here, the axial direction is a direction parallel to the rotation axes L4 to L6.
Each of the first drive sprocket 11 and each of the first driven sprockets 12 constituting the first sprocket group over which the first transmission chain 13 is stretched is a first sprocket. Each of the second drive sprocket 21 and each second driven sprocket 22 constituting the second sprocket group over which the second transmission chain 23 different from the first transmission chain 13 is spanned is the first sprocket. Another second sprocket.
Each rotation axis L4, L6 is a first rotation axis, and each rotation axis L5, L6 is a second rotation axis.

The first movable guide 100 can be moved to a first support shaft 37 (see also FIG. 3) as a first guide support portion provided in the engine body 31, and can swing about the swing axis S1 here. Supported.
The second movable guide 200 is movable to a second support shaft 38 as a second guide support portion different from the first support shaft 37 provided in the engine main body 31, and here, different from the swing axis S1. The second swing axis S2 is supported so as to be swingable.
The fixed guides 170 and 270 are fixed to the engine body 31 with bolts (not shown) as coupling means.

The chain tensioners 190 and 290 attached to the engine body 31 have plungers 192 and 292 that are supported by the bodies 191 and 291 so as to be movable in the forward and backward directions.
Each plunger 192, 292 moves forward in a forward / backward direction parallel to the central axis of the plunger 192, 292 and presses each movable guide 100, 200, whereby each transmission chain 13, While tension is applied to the transmission chain 23, the transmission chain 13 and 23 are prevented from retreating in the advancing and retreating direction due to the reaction force from the transmission chain 13 and 23, thereby preventing excessive tension from being generated in the transmission chain 13 and 23.

1, 2, and 3, the first movable guide 100 includes a base end portion 101 that is swingably supported by a first support shaft 37 that is provided by being screwed into the engine body 31, and a guide. And a distal end portion 102 that is spaced apart from the proximal end portion 101 in the longitudinal direction.
The first movable guide 100 includes a radial gap Cr and an axial gap at the base end portion 101 that enable the first movable guide 100 to swing between the base end portion 101 and the first support shaft 37. The guide support structure in which Ca is formed supports the first support shaft 37 or the engine main body 31 via the first support shaft 37.
The plunger 192 biases the first movable guide 100 at the pad 140 which is a portion near the tip end portion 102 in the guide longitudinal direction.
In FIG. 3, these gaps Cr and Ca are exaggerated from the viewpoint of easy understanding.

Referring to FIG. 1, the second movable guide 200 has a structure similar to that of the first movable guide 100, and thus has a proximal end portion similar to the proximal end portion 101 and a distal end portion 202 similar to the distal end portion 102.
The second movable guide 200 is supported on the engine body 31 by a guide support structure using a second support shaft 38 similar to the guide support structure of the first movable guide 100. Between the base end portion of the second movable guide 200 and the second support shaft 38, there are a radial gap and an axial gap (not shown) similar to the radial gap Cr and the axial gap Ca, respectively. Is formed.

Referring to FIGS. 1, 2, 4, and 5, the first movable guide 100 includes a guide main body 110 extending in the guide longitudinal direction and a protrusion 150 provided on the guide main body 110.
The guide main body 110 has a base end portion 101 and extends in the guide longitudinal direction, and a chain travel surface 131 in which the link plate 13a of the transmission chain 13 traveling in the chain travel direction slides and moves in the guide longitudinal direction. And a shoe 140 fixed to the base 120 and a pad 140 (see FIGS. 1 and 4) having a contact surface 141 with which the plunger 192 contacts the base 120.
The tip portion 202 is constituted by the tip portions 120 e and 130 e of the base 120 and the shoe 130.

The base 120 is a rigid portion that supports the shoe 130, and is formed of a high-strength forming material, for example, metal (for example, aluminum) as compared with the forming material of the shoe 130.
The protrusion 150 is formed on the opposing surface 111 facing the second fixed guide 270 in the axial direction in the guide body 110, and toward the second fixed guide 270 in the axial direction at least in a superposed region A (see FIG. 1) described later. It protrudes and is made of synthetic resin.

The base 120 includes a shoe-side flange 121 having a support surface 124 that supports the shoe 130, an anti-shoe-side flange 122 having a back surface 125 of the first movable guide 100, and a web 123 connecting both flanges 121, 122. And a rib 126.
The shoe 130 is wear-resistant from the viewpoint of suppressing the occurrence of wear on the chain running surface 131 formed between the pair of regulating portions 132 and 133 for regulating the meandering of the first transmission chain 13. It is formed of a synthetic resin.
The protrusion 150 is formed by integral molding with the shoe 130 using the same synthetic resin as that forming the shoe 130.

  The protrusion 150 is a position in the guide longitudinal direction, and at least a part of the protrusion 150 occupies the same position as the position of the pad 140, or is disposed closer to the distal end portion 102 than the pad 140. In this embodiment, more specifically, the protrusion 150 is located at the same position as the pad 140 so that the majority of the protrusion 150 occupies the same position as the pad 140 in the longitudinal direction of the guide. It is provided to occupy.

  The projecting portion 150 is formed on the opposing surface 111 from the shoe 130 in the orthogonal direction (or the guide thickness direction, hereinafter referred to as “orthogonal direction”) as the intersecting direction intersecting the guide longitudinal direction. 120 extends in the orthogonal direction beyond the shoe-side flange 121 and the web 123 to the opposite shoe-side flange 122, which is the end opposite to the shoe 130, over the entire width of the base 120 in the orthogonal direction. It is a ridge provided. In the present embodiment, the protrusion 150 extends in parallel to the orthogonal direction.

The projecting portion 150 is a raised portion that is raised in an arc shape in the axial direction, and is a columnar shape portion 151 that is raised in a partial columnar shape or a substantially semi-columnar shape in the present embodiment.
In addition, a partial cylinder means a cylindrical part, Similarly, a partial cylindrical surface means a part of a cylindrical surface, and a partial cylinder and a partial cylinder mean a part of a cylinder and a part of a cylinder, respectively.
In addition, the shape of the outer surface 152 of the projecting portion 150 protruding in an arc shape is a partial cylindrical surface having one radius of curvature in this embodiment, but is configured by partial cylindrical surfaces having a plurality of curvature radii. It may be a curved surface or a composite surface including a partial cylindrical surface and a plane.

  The protrusion 150 is provided with an oil groove 154 that communicates with the chain running surface 131 and that opens to the outer side surface 152 and guides the lubricating oil adhering to the chain running surface 131. The oil groove 154 is located at the top portion 153 (see FIG. 5) that is the central portion in the axial direction in the protrusion 150.

  Referring to FIG. 1, the second movable guide 200 is similar to the guide main body 110 of the first movable guide 100, and includes a base 220, a shoe 230, and a base 120, a shoe 130, and a pad 140, respectively. A pad 240 is provided.

Referring to FIGS. 1, 4 and 5, the second fixed guide 270 includes a base 271 extending in the guide longitudinal direction of the fixed guide 270 and a link plate 23a of the second transmission chain 23 traveling in the chain traveling direction. And a shoe 280 fixed to the base 271 as well as having a chain running surface 281 that slides and moves in the guide longitudinal direction.
The base 271 includes a shoe side flange 272 that supports the shoe 280, an anti-shoe side flange 273, a web 274 that connects both the flanges 272 and 273, and a rib 276. A space 275 is formed by a recess formed by the flanges 272 and 273 and the web 274.

Referring to FIG. 1, the first fixed guide 171 has a base 171 and a shoe 180 corresponding to the base 271 and the shoe 280, respectively, like the second fixed guide 270.
Each of the bases 171 and 271 is made of a material having a higher strength than the material for forming the shoes 180 and 280, for example, a metal, and is made of the same material as the bases 120 and 220 as an example.
The shoes 180 and 280 are made of wear-resistant synthetic resin, and are made of the same material as the shoes 130 and 230, for example.

Referring to FIGS. 1, 4, 5, and 6, the second fixed guide 270 is an adjacent member adjacent to the first movable guide 100 in the axial direction, and is a chain guide different from the first movable guide 100. It is.
The first movable guide 100 is disposed close to the second fixed guide 270 in the axial direction and overlaps the second fixed guide 270 when viewed from the axial direction (in the enlarged view of FIG. 1, the shaded area). It is arranged at a position where a) is formed. This overlapping region A changes according to the swing position of the first movable guide 100.

Here, “adjacent” refers to the virtual plane P1 (or virtual plane P2) relatively between the first movable guide 100 as the chain guide and the second fixed guide 270 when the chain transmission device 1 is operated. ) Inclines (hereinafter referred to as “inclined state”, an example of which is shown by a two-dot chain line in FIGS. 3, 4, and 5) and without being inclined. When the relative movement state in the axial direction (hereinafter referred to as “translation state”) occurs relatively between the first movable guide 100 and the second fixed guide 270, the first movable guide 100. And the second fixed guide 270 are in contact with each other (as described above, the term “contact” includes “collision”). The fixed guide 270 is separated in the axial direction. Which means that you are.
Further, the inclined state includes a case in which the relative movement in the axial direction is relative between the first movable guide 100 and the second fixed guide 270.

In the present embodiment, the inclined state is caused by the guide support structure in which the gaps Cr and Ca between the first support shaft 37 are formed and the first movable guide 100 is inclined with respect to the virtual plane P1. The parallel movement state is caused by the movement of the first movable guide 100 parallel to the axial direction due to the guide support structure.
Note that the second movable guide 200 can also have an inclined state and a parallel movement state similar to the inclined state and the parallel movement state of the first movable guide 100 due to the guide support structure.
Accordingly, the movable guides 100 and 200 are swingably supported by the support shafts 37 and 38 in a state where an inclined state and a parallel movement state can be generated by the guide support structure.

More specifically, the first movable guide 100 is indicated by a two-dot chain line in FIGS. 3 and 4 in the inclined state, and as shown in FIG. 6, the first movable guide 100 with respect to the first virtual plane P1. As shown by a two-dot chain line in FIG. 5 and a first inclined state inclined about 100 guide longitudinal directions (see FIG. 2), an imaginary plane P1 with an inclination angle θ around an orthogonal direction (see FIG. 2). Even when tilted (or when the first movable guide 100 is tilted with respect to the first virtual plane P1 as viewed from the orthogonal direction), the second tilted state and the third tilted state in which these first and second tilted states occur simultaneously Is included.
FIG. 6 shows a first inclined state in which the virtual plane P1 (or virtual plane P2) is inclined to the side opposite to the first inclined state shown in FIGS.

  4 and 5, when the chain transmission device 1 is operated, when a relatively inclined state occurs between the first movable guide 100 and the second fixed guide 270, or When the parallel movement state occurs, the first movable guide 100 comes into contact with the second fixed guide 270 only by the protrusion 150, so that the base 120, the shoe 130, and the second fixed guide of the first movable guide 100 are contacted. Contact with the base 271 and the shoe 280 of the 270 is prevented.

  Further, as shown in FIG. 6, both flanges are provided between the web 123 and the protrusion 150 in the axial direction when the protrusion 150 and the shoe 280 (or the base 271) of the second fixed guide 270 collide with each other. Since the space 105 formed by the recess formed by 121, 122 and the web 123 is formed, in the case of colliding with the second fixed guide 270 in the portion 150a forming the space 105 in the axial direction. Since the portion 150a is bent so as to enter the space 105, the impact at the time of collision is reduced.

Next, the operation and effect of the first embodiment will be described.
In the chain transmission device 1 including the first and second chain transmission mechanisms 10 and 20, the first movable guide 100 that guides the first transmission chain 13 that travels at a position that intersects the virtual plane P <b> 1 is the first transmission chain 13. A superposition region A is formed which guides the second transmission chain 23 which is another transmission chain, is adjacent to the second fixed guide 270 adjacent in the axial direction, and overlaps the second fixed guide 270 when viewed from the axial direction. Since the first movable guide 200 is disposed close to the second fixed guide 270 in the axial direction, the first movable guide 200 is disposed with respect to the second fixed guide 270 that together forms the overlapping region A. The first transmission chain 13 and thus the first chain transmission mechanism 10 can be arranged compactly in the axial direction.

The first movable guide 100 protrudes toward the second fixed guide 270 in the axial direction in the overlapping region A and the guide main body 110 having a facing surface 111 that faces the chain traveling surface 131 and the second fixed guide 270 in the axial direction. The projection 150 is provided on the opposing surface 111 and made of synthetic resin. When the chain transmission device 1 is operated, the virtual plane P1 (or the virtual plane P2) is formed between the second fixed guide 270 and the second fixed guide 270. ), The protrusion 150 first contacts the second fixed guide 270.
With this configuration, when the first movable guide 100 and the second fixed guide 270 come into contact with each other in an inclined state in which a relative inclination occurs between the first movable guide 100 and the second fixed guide 270, the first movable guide 100 and the second fixed guide 270 come into contact with each other. In the guide 100, only the synthetic resin protrusion 150 is in contact with the base 271 of the second fixed guide 270, so that the base 120 of the guide body 110 and the base 271 of the second fixed guide 270 are in contact with each other first. Thus, the projecting portion 150 has an effect based on the fact that the projecting portion 150 has elasticity based on the synthetic resin and that the projecting portion 150 is provided with flexibility by the space 105 formed between the projecting portion 150 and the web 123. Due to the buffering effect, noise generated due to the contact between the first movable guide 100 and the second fixed guide 270 can be suppressed, and the protrusion 150 can be suppressed. By being made of synthetic resin, wear of the guide body 110 of the first movable guide 100 and the second fixed guide 270 due to the contact between the first movable guide 100 and the second fixed guide 270 (for example, the protrusion 150 is provided). Wear of the bases 120 and 271 due to contact between the bases 120 and 271 and wear of the shoe 280 (or shoe 130) due to contact between the base 120 and the shoe 280 (or the base 271 and the shoe 130). ) Can be suppressed or prevented.

The guide body 110 includes a shoe 130 having a chain running surface 131 with which the traveling first transmission chain 13 is slidably contacted, and a base 120 as a rigid portion that supports the shoe 130. Is formed by integral molding of synthetic resin, and the projecting portion 150 is formed on the opposite surface 111 in the orthogonal direction perpendicular to the longitudinal direction of the guide, and from the shoe 130 on the opposite side to the shoe 130 in the orthogonal direction in the base 120. It is a ridge extending to the anti-shoe side flange 122 which is the end.
With this configuration, since the protruding portion 150 is integrally formed with the shoe 130, the number of parts can be reduced, and the cost of the first movable guide 100 can be reduced. In addition, the protruding portion 150 extends the base 120 in the orthogonal direction. Since it extends across from the shoe 130 to the anti-shoe side flange 122 of the base 120 through the shoe side flange 121, even when the first movable guide 100 and the second fixed guide 270 are relatively displaced in the orthogonal direction. The contact between the guide body 110 and the second fixed guide 270 can be prevented.

  Further, since the protrusion 150 extends from the shoe 130 to the anti-shoe side flange 122, when the first movable guide 100 and the second fixed guide 270 come into contact with each other, the shoe side flange 121, the shoe 130, or the The anti-shoe side flange 122 (or the shoe side flange 272, the shoe 280 or the anti shoe side flange 273 of the second fixed guide 200) is the space 275 of the second fixed guide 271 (or the space 105 of the first movable guide 100). It is possible to prevent the first movable guide 100 from being caught by the second fixed guide 270.

  The protrusion 150 is a ridge that protrudes in an arc shape in the axial direction and extends in the orthogonal direction on the facing surface 111, whereby the first movable guide 100 is inclined around the orthogonal direction with respect to the virtual plane P1. Even in the second inclined state, since the second fixed guide 270 contacts the protrusion 150 with a smooth arc-shaped portion, the dependence on the inclination angle θ of the first movable guide 100 around the orthogonal direction is reduced. However, noise and wear due to contact can be suppressed, and wear generated on the protrusion 150 can also be suppressed.

  The protrusion 150 is provided with an oil groove 154 that communicates with the chain running surface 131 and guides the lubricating oil adhering to the chain running surface 131. Thus, the protrusion 150 passes through the oil groove 154 from the chain running surface 131. With the lubricating oil guided to 150, wear at the contact portion of the second fixed guide 270 with the protrusion 150 can be suppressed, and further, wear at the protrusion 150 can be suppressed.

Next, the 1st movable guide 100 in 2nd-4th Example is demonstrated with reference to FIGS.
Since the second to fourth embodiments have a partially common structure with respect to the first embodiment, the description of the same or corresponding portions will be omitted or simplified, and different points will be mainly described. To do. In addition, about the same member as the member of the said Example etc., or a corresponding member etc., the detailed description is abbreviate | omitted by using the same code | symbol as needed.

7 and 8, in the second embodiment of the present invention, the protrusion 150 of the first movable guide 100 is a partial cylindrical wall 157 forming a hollow portion 158, which is a semicircular shape in this embodiment. This is a partial cylindrical wall.
With this configuration, since the hollow portion 158 is formed, the rigidity of the protrusion 150 is reduced, and the flexibility due to elastic deformation at the protrusion 150 is increased. As a result, at the time of collision with the second fixed guide 270, the protrusion 150 is easily bent as shown by a two-dot chain line in FIG. 8, so that the impact due to the collision between the protrusion 150 and the second fixed guide 270 is mitigated. Thus, noise caused by the collision can be reduced.

Referring to FIGS. 9 and 10, in the third embodiment of the present invention, the protrusion 150 of the first movable guide 100 protrudes in the axial direction. A pair of arcuate walls 161 and 162 that are curved so as to approach each other in the direction, and each arcuate wall 161 and 162 is formed in a bowl shape. A gap G in the guide longitudinal direction is formed between the tip portions 161a and 162a, and a space 163 is formed by a pair of arcuate walls 161 and 162.
As another example, in a pair of arcuate walls 161 and 162, the tip of one arcuate wall (eg, the tip 161a of the arcuate wall 161) is the tip of the other arcuate wall (eg, arcuate wall 162). A gap may be formed between the second arcuate wall and the other arcuate wall at a portion other than the tip 162a).

  With this configuration, the protrusion 150 is a pair of arcuate walls 161 and 162 that are separated in the longitudinal direction of the guide, so that the columnar shape portion 151 and the partial cylindrical shape that constitute the protrusion 150 of the first and second embodiments. Compared with the wall 157, the rigidity of the protrusion 150 is reduced, and the flexibility due to the elastic deformation of the protrusion 150 due to the collision with the second fixed guide 270 is increased. As a result, at the time of collision with the second fixed guide 270, as shown by a two-dot chain line in FIG. 10, the protrusion 150 is easily bent, so that the buffering effect by the protrusion 150 is improved, and the protrusion 150 and the second The noise reduction effect by the protrusion 150 at the time of collision with the fixed guide 270 can be improved.

  Furthermore, in the second embodiment, the hollow portion 158 is formed in the protrusion 150, and in the third embodiment, the protrusion 150 is sandwiched between the pair of arcuate walls 161 and 162. By forming the space 163, the weight of the first movable guide 100 is reduced compared to the case where the hollow portion 158 and the space 163 are not formed in the protrusion 150 (for example, the first embodiment), and the inertia of the first movable guide 100 is reduced. Therefore, the movement responsiveness due to the urging force by the chain tensioner 190 and the reaction force from the first transmission chain 13 is improved, and the quickness of the tension adjustment of the first transmission chain 13 can be improved.

Referring to FIGS. 11 and 12, in the fourth embodiment of the present invention, the basic structure of the first movable guide 100 is the same as that of the first embodiment including the protrusion 150, but the pad 140 is the same. The difference is that the protrusion 150 is integrally formed and the oil groove extends to the pad 140.
Specifically, the pad 140 is formed by integrally molding the shoe 130 and the protrusion 150 with a synthetic resin. The oil groove 154 provided in the protrusion 150 reaches the corresponding contact surface 141 so that the lubricating oil in the oil groove 154 is guided to the contact surface 141.
In order to smoothly guide the lubricating oil on the chain running surface 131 to the abutment surface 141 through the oil groove 154, an upstream end 154a that is a lubricating oil introducing portion that opens to the chain running surface 131 in the oil groove 154, It is preferable that the first movable guide 100 is disposed so as to be positioned above the downstream end 154b that is the lubricant oil lead-out portion that opens to the contact surface 141.

With this configuration, the lubricating oil of the chain running surface 131 is supplied to the contact surface 141 via the oil groove 154, so that the wear of the pad 140 can be suppressed. Further, when the plunger 192 and the pad 140 are in contact with each other, the air sandwiched between the plunger 192 and the contact surface 141 is released from between the plunger 192 and the contact surface 141 through the oil groove 154. Air is prevented from being compressed by the contact surface 141, and noise caused by the outflow of compressed air from between the plunger 192 and the contact surface 141 is prevented.
Further, since the shoe 130, the protrusion 150, and the pad 140 are formed by synthetic resin integral molding, the number of parts can be reduced, and the cost of the first movable guide 100 having the pad 140 can be reduced. Noise due to contact between the plunger 192 and the pad 140 can be suppressed by a buffering effect based on the pad 140 being a synthetic resin.

Hereinafter, an example in which a part of the configuration of the above-described embodiment is changed will be described with respect to the changed configuration.
When the first movable guide 100 and the second fixed guide 270 are in contact with each other, only the protrusion 150 may be contacted first, and then the guide main body 110 may be contacted. Since only 150 is provided, the impact at the time of contact is mitigated by the protrusion 150, and noise and wear of the guide body 110 are suppressed.
In each of the embodiments, the protrusion 150 extends in parallel to the orthogonal direction. However, the protrusion 150 may extend in the orthogonal direction by extending in parallel to the direction inclined in the orthogonal direction. The protrusion 150 may be configured by a member separate from the shoe 130.
The oil groove 154 may be constituted by a plurality of grooves extending in the orthogonal direction, or may not be provided.
The protrusion may be configured by a plurality of mountain-shaped protrusions arranged in an orthogonal direction or a direction inclined in the orthogonal direction. The ridges constituting the protrusions may be divided locally in the orthogonal direction or locally in the guide longitudinal direction.

Instead of being provided on the first movable guide 100 in the first movable guide 100 and the second fixed guide 270 that form the overlapping region A, the protrusion may be provided on the second fixed guide 270. It may be provided on both the movable guide 100 and the second fixed guide 270. In the latter case, the protrusions may contact each other, or the protrusions may contact the guide body.
Here, the guide main body of the second fixed guide 270 includes a base 271 and a shoe 280.

The present invention may be applied to the movable guide having the protrusion and the engine body 31 for one chain transmission mechanism provided in the chain transmission device. Further, regarding the two transmission chain mechanisms provided in the chain transmission device, depending on the arrangement of the first and second transmission chains, the first and second movable guides or the first fixed guide and the second movable guide, The present invention may be applied.
The first and second drive rotating members are the same in the above-described embodiments, but may be separate rotating members.

DESCRIPTION OF SYMBOLS 100 ... Movable guide 110 ... Guide main body 111 ... Opposite surface 120 ... Base 130 ... Shoe 131 ... Chain running surface 140 ... Pad 141 ... Contact surface 150 ... -Protruding part 154-Oil groove 270-Fixed guide 271-Base 280-Shoe 190-Chain tensioner P1-Virtual plane A-Superposition region

Claims (7)

A chain guide that is provided in a chain transmission device that includes a transmission chain wound around a sprocket that can rotate around a rotation axis, and that guides the transmission chain that travels at a position intersecting with a virtual plane orthogonal to the rotation axis. In the chain guide that is disposed in the vicinity of the adjacent member adjacent in the axial direction parallel to the rotation axis, and at the position where the overlapping region is formed overlapping the adjacent member when viewed from the axial direction,
A guide main body having a chain running surface with which the traveling transmission chain is in sliding contact and a facing surface facing the adjacent member in the axial direction; and projecting toward the adjacent member in the axial direction in the overlapping region; A protrusion formed on the opposing surface and formed of a synthetic resin,
In the operation of the chain transmission device, when the inclined state that is relatively inclined with respect to the virtual plane occurs with the adjacent member, the protruding member first contacts the adjacent member. Chain guide. The guide body has a shoe having the chain running surface, and a base as a rigid portion that supports the shoe,
The protrusion and the shoe are formed by integral molding of synthetic resin,
The protrusion is a protrusion that extends from the shoe to an end of the base opposite to the shoe in the orthogonal direction in the orthogonal direction orthogonal to the guide longitudinal direction on the facing surface. The chain guide according to claim 1, wherein the chain guide is characterized in that:   3. The protrusion according to claim 1, wherein the protrusion is a protrusion that protrudes in an arc shape in the axial direction and extends in an orthogonal direction orthogonal to the longitudinal direction of the guide on the facing surface. Chain guide as described.   4. The oil groove according to claim 1, wherein the protrusion is provided with an oil groove that communicates with the chain running surface and guides the lubricating oil adhering to the chain running surface. Chain guide described in one. The guide body has a pad having a contact surface with which a plunger of the chain tensioner contacts;
The chain guide according to claim 4, wherein the oil groove reaches the contact surface so that lubricating oil is guided to the contact surface.   The chain guide according to any one of claims 1 to 3, wherein the protruding portion is a partial cylindrical wall forming a hollow portion. A pair of arcuate walls that protrude in the axial direction from positions spaced apart in the longitudinal direction of the guide and bend so as to approach each other in the longitudinal direction of the guide as it protrudes;
The tip part of one said arcuate wall forms the clearance gap between the said other arcuate walls, or is contacting the said other arcuate wall, The Claims 1-3 The chain guide according to any one of the above.

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