JP2017053433A - Friction roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easy assembling friction roller capable of performing a stable power transmission through friction between a driving pulley and a driven pulley.SOLUTION: One end part of each of a pair of guide rods 29 is supported by both ends of an oscillation arm 25 arranged at an arm supporting shaft 21 fixed to an engine block and a slide member 30 supported by the pair of guide rods 29 is biased by a resilient member 33 toward a flange 34. A roller main body 37 is rotatably supported by the slide member 30, the slide member 30 is slid toward the oscillation arm 25 by pushing-in of the roller main body 37, a set member 50 is inserted into an engaging part X formed between both ends of the slide member 30 and the flange 34 at the other end part of each of the guide rods 29, the roller main body 37 is kept at its pushed-in state to facilitate assembling of a friction roller 20 and then the oscillation arm 25 and the slide member 30 are stored in a friction ring 38 at an outer periphery of the roller main body 37 to attain a small-sized friction roller.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a friction roller that is provided so as to be in contact with and away from a drive pulley and a driven pulley and transmits the rotation of the drive pulley to the driven pulley by frictional contact with both pulleys.

  In order to reduce carbon dioxide emissions, a generator with motor function (ISG) (Integrated Starter Generator) that stops the engine when the vehicle is stopped and starts the engine instantly when the vehicle is started by depressing the accelerator pedal is installed. In such an engine, the rotation of the crankshaft of the engine is normally transmitted to an auxiliary device such as a water pump or a generator with a motor function by a belt transmission. Further, when the engine is started, the power of the generator with a motor function is transmitted to the crankshaft.

  In a power transmission device for an engine that employs such a belt transmission device as described above, the water pump always rotates as the crankshaft rotates. For this reason, even when it is not necessary to rotate the water pump, such as when the engine is warming up, or when the engine is quickly reached the maximum efficiency, the water pump rotates, resulting in large torque loss and fuel consumption. There is a problem that there are many.

  In order to solve the above problem, in the belt drive described in Patent Document 1 below, a drive pulley (crankshaft pulley) attached to the end of the crankshaft and a driven pulley (friction pulley) attached to the rotating shaft of the auxiliary machine The friction roller (friction wheel) is provided between the friction roller and the drive pulley and the driven pulley so that the friction roller can contact and disengage. When the water pump is driven, the friction roller is in contact with the drive pulley and the driven pulley. The power is transmitted from the drive pulley to the driven pulley by the contact rotation of the friction roller.

  Further, when the engine is started by starting the generator with motor function (ISG), the friction roller is displaced to the separation position, and the power transmission from the driving pulley to the driven pulley is cut off.

Special table 2008-519950 gazette

  By the way, in the power transmission device, as described in Patent Document 1, the friction roller is rotatably supported at the tip of the arm, and the arm is moved in the length direction by the operating device, so that the friction roller is Since the displacement is made between the position where the drive pulley and the driven pulley are in contact with each other and the position where they are separated from each other, the power transmission device must be enlarged and a large space must be secured for incorporating the arm and the actuator. There is a disadvantage that the layout is often restricted.

  An object of the present invention is to provide an easily incorporated friction roller that can stably perform power transmission by friction between a drive pulley and a driven pulley and can reduce the size of the power transmission device. It is.

  In order to solve the above problems, in the present invention, in the friction roller which is provided so as to be in contact with and separated from the drive pulley and the driven pulley and transmits the rotation of the drive pulley to the driven pulley by frictional contact with both pulleys. An arm support shaft attached to the support target, a swing arm supported to be swingable about the arm support shaft, and a pair of parallel guides having one end supported at both ends of the swing arm A rod, a slide member slidably supported by the pair of guide rods, and a circular friction wheel that accommodates the swing arm and the slide member and is capable of contacting and separating from the driving pulley and the driven pulley. A disc part is provided inside the friction wheel, and a roller shaft provided in the center of the disc part is provided with A pair of elastic members that are supported by each of the pair of guide rods and urge the slide member toward a retaining portion provided at the other end of the guide rod. A member and a set member which can be freely inserted into and removed from an engagement portion provided in the roller body from an opening formed in a disk portion of the roller body, and holds the elastic member in a contracted state in the inserted state The configuration comprising the above is adopted.

  When the friction roller having the above-described configuration is incorporated into the power transmission device, the elastic member is contracted by pushing the roller body toward the direction in which the slide member approaches the swing arm, and is formed on the disk portion of the roller body. A set member is inserted into the roller main body from the opening, and the set member is inserted into the engaging portion to hold the roller main body in a pressed state. In the pushed-in holding state, a friction roller is incorporated on one side between the opposed portions of the drive pulley and the driven pulley, and the arm support shaft is fixed to the pulley support target to incorporate the friction roller.

  When the set member is removed from the opening after the friction roller is assembled as described above, the slide member that rotatably supports the roller body by the restoring elastic force of the pair of elastic members is separated from the arm support shaft, and the roller body is driven. It moves toward the outer diameter surfaces of the pulley and the driven pulley, and elastically contacts the outer diameter surfaces of both pulleys.

  At this time, if the roller body first comes into contact with the outer diameter surface of one of the driving pulley and the driven pulley, the swinging arm is centered on the arm support shaft by the pressing force of the elastic member on the side away from the contact position. Swing. As a result of the swing, the swing arm is displaced to a position corresponding to the position of each pulley, the roller main body comes into contact with the other pulley, and the roller main body is evenly elastically contacted with both the driving pulley and the driven pulley.

  In this way, the roller main body is equally elastically contacted with both the driving pulley and the driven pulley by the pair of elastic members, so that the power transmission by friction between the driving pulley and the driven pulley can be stably performed. .

  In the friction roller according to the present invention, the engagement portion that holds the elastic member in the contracted state when the set member is inserted and removed is between the retaining portion provided at the other end of the guide rod and the facing portion of the slide member. Or a pair of set holes formed from the outer periphery of both ends of the slide member toward the outer periphery of the guide rod and the outer periphery of the pair of guide rods, respectively, toward the swing arm of the slide member It may be a communicating hole portion of a radial pin hole communicating with each of the pair of set holes by sliding.

  When the engagement portion is provided between the retaining portion provided at the other end portion of the guide rod and the facing portion of the slide member, the set member is provided with a pair of insertion piece portions at both ends of the operation piece portion. The insertion piece portion may be formed of a planar U-shaped band-like plate inserted into the engagement portion so as to sandwich the pair of guide rods, or has a pair of insertion piece portions on both sides. The pair of insertion piece portions may be formed of a flat U-shaped belt-like plate inserted into the engagement portion so as to sandwich the guide rod from both sides.

  In adopting the set member as described above, a stable set state can be obtained by providing a semicircular bent portion along the semi-periphery of the guide rod at the tip of the insertion piece.

  In addition, when the communication hole portion of the pair of set holes formed on the outer periphery of both ends of the slide member and the radial pin hole formed on the outer periphery of each of the pair of guide rods is used as the engaging portion, the set member is a communication hole. It is set as the pin which can be inserted / removed with respect to the engaging part which consists of a part. In this case, the pin may be a single needle that is inserted only into one of the pair of engaging portions, and may be provided with a ring-shaped fingertip engaging portion at the end thereof, or the operation piece. A flat U-shape may be provided in which insertion piece portions to be inserted into each of the pair of engaging portions are provided at both ends of the portion.

  In addition, the engaging portion that holds the elastic member in the contracted state when the set member is inserted and removed may be between the facing surfaces of the friction wheel in the roller arm and the roller body. In this case, the set member is a prismatic set piece.

  In the present invention, as described above, the pair of elastic members is elastically deformed by pushing the roller body toward the swing arm, and the roller body is held in the pushed state by inserting the set member into the engaging portion. Therefore, when the friction roller is assembled between the driving pulley and the driven pulley, it is not necessary to hold the roller main body in the pushed state, and the friction roller can be assembled easily.

  Further, by pulling out the set member after the friction roller is assembled, the roller body can be brought into elastic contact equally with both the drive pulley and the driven pulley by the pressing force of the pair of elastic members. Power transmission by friction with the pulley can be stably performed.

  Further, in the friction ring of the roller body, a swing arm that can swing around the arm support shaft, a slide member that can move toward the swing arm, and a direction in which the slide member moves away from the swing arm. A pair of elastic members that energize the roller body to elastically contact the roller body evenly with the driving pulley and the driven pulley are accommodated, so it is only necessary to secure a space for incorporating the friction roller between the driving pulley and the driven pulley. The power transmission device can be downsized.

Schematic of a power transmission device equipped with a friction roller according to the present invention Sectional view along the line II-II in FIG. Sectional view along line III-III in FIG. Partially cutaway sectional view showing a part of FIG. 3 in an enlarged manner Sectional view along line VV in FIG. Sectional drawing which shows the other example of a set member Partially cutaway front view showing another example of set member Sectional view along line VIII-VIII in FIG. Partially cutaway front view showing still another example of set member Partially cutaway front view showing still another example of set member Sectional view along line XI-XI in FIG. Front view with friction low displaced to contact position

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a power transmission device for driving an auxiliary machine of an engine equipped with a starter generator. A crankshaft pulley 11 (hereinafter referred to as a drive pulley 11) as a drive pulley attached to the crankshaft 10 and a starter A belt 16 is passed between the starter / generator pulley 13 of the generator 12 and the compressor pulley 15 attached to the rotating shaft of the compressor 14 of the air conditioner. During normal operation of the engine, the starter is rotated by the rotation of the drive pulley 11 in the direction indicated by the arrow. The generator 12 and the compressor 15 are driven so that the starter generator 12 functions as a generator.

  Further, when the engine is started by driving the starter / generator 12, the drive pulley 11 is rotated by the rotation of the starter / generator pulley 13 in the direction indicated by the arrow to start the engine so that the starter / generator 12 functions as a starter. ing.

  Further, an auxiliary pulley 18 as a driven pulley (hereinafter referred to as a driven pulley 18) attached to a rotating shaft of a water pump 17 as an engine auxiliary device is disposed around the driving pulley 11, and the driven pulley 18 and the driving pulley 11 are arranged. The friction roller 20 is provided on one side between the opposing portions of the two pulleys so as to be able to contact and separate from both pulleys, the friction roller 20 is brought into contact with both the driving pulley 11 and the driven pulley 118, and the friction roller 20 rotates in contact Thus, power is transmitted from the drive pulley 11 to the driven pulley 18.

  As shown in FIGS. 2 and 3, the friction roller 20 includes an arm support shaft 21 attached to an engine block 19 as a pulley support target, and a swing supported so as to be swingable about the arm support shaft 21. It has an arm 25.

  The arm support shaft 21 has a head portion 22, and a small-diameter screw shaft 23 is provided at a tip portion. The arm support shaft 21 is attached to the engine block 19 by screwing the screw shaft 23 into the engine block 19. At this time, the screw shaft 23 is screwed in a state in which the collar 24 is fitted, and the collar 24 is interposed between the tip of the arm support shaft 21 and the engine block 19.

  The swing arm 25 is provided with a shaft insertion hole 26 at the center between both ends, a bearing sleeve 27 in the shaft insertion hole 26, and an arm support shaft 21 inserted in the bearing sleeve 27. A swing arm 25 is swingably supported around the support shaft 21.

  At both ends of the swing arm 25, shaft holes 28 are formed at positions away from the arm support shaft 21 by an equal distance in the both end directions, and one end portions of a pair of guide rods 29 are inserted into the shaft holes 28, respectively. The pair of guide rods 29 are arranged in parallel, and a retaining ring 29a is attached to the end of the rod protruding from the shaft hole 28 to prevent it from being removed.

  A slide member 30 is disposed on the upper side of the swing arm 25 so as to face each other. A pair of rod insertion holes 31 are formed at both ends of the slide member 30, and the pair of guide rods 29 are inserted into the pair of rod insertion holes 31, respectively. Is slidably supported.

  Further, in order to smoothly slide the slide member 30 at both ends of the pair of rod insertion holes 31, a slide bearing 32 is incorporated between the guide rod 29 and the slide member 30 is slidably supported.

  An elastic member 33 is incorporated in the pair of guide rods 29 between opposed ends of the swing arm 25 and the slide member 30. The elastic member 33 is formed of a coil spring, and the elastic member 33 biases the slide member 30 toward a flange 34 as a retaining portion provided at the other end portion of the guide rod 29.

  The slide member 30 is provided with a bearing fitting hole 35 at a central position between the pair of rod insertion holes 31. A rolling bearing 36 is fitted into the bearing fitting hole 35, and a roller body 37 is rotatably supported by the rolling bearing 36. Here, a ball bearing with a seal is employed as the rolling bearing 36, but the present invention is not limited to this.

  The roller main body 37 has a circular friction ring 38 on the outer peripheral portion thereof that can be brought into contact with and separated from the drive pulley 11 and the driven pulley 18 shown in FIG. 1, and a disk portion 39 is formed inside one end of the friction ring 38. A roller shaft 40 is provided at the center of the disk portion 39, and the roller shaft 40 is rotatably supported by a rolling bearing 36. In the supported state, each of the swing arm 25 and the slide member 30 is accommodated in the friction wheel 38.

  In addition, the disc part 39 in the roller main body 37 may be provided at a position offset from the one end part of the friction ring 38 toward the center side in the axial width in consideration of the overall weight balance.

  Here, when an unbalanced load acts on the rolling bearing 36 from the roller body 37, the rolling bearing 36 is easily damaged. In order to prevent such inconvenience, the roller body 37 is supported by the rolling bearing 36 so that the width center line L of the roller body 37 coincides with the width center line of the rolling bearing 36 as shown in FIG. ing.

  As shown in FIGS. 2 to 3, an engaging portion X is formed between the opposing portions of the flange 34 as a retaining portion provided at the other end portion of the slide member 30 and the guide rod 29. The set member 50 can be inserted and removed freely. Then, the roller main body 37 is pushed in the direction in which the slide member 30 moves toward the swing arm 25, and the roller main body 37 is inserted into the engaging portion X in a state where the pair of elastic members 33 are contracted. It is held in the pushed state.

  The set member 50 is composed of a planar U-shaped band plate formed by bending a pair of insertion piece portions 52 at both ends of the operation piece portion 51, and the pair of insertion piece portions 52 includes the slide member 30 and a pair of guides. The engagement portion X between the flanges 34 at the other end of the rod 29 can be freely inserted and removed, and the slide member 30 is held at a position displaced by the swing arm 25 by insertion.

  At this time, the set member 50 is inserted such that the pair of insertion pieces 52 sandwich the pair of guide rods 29 from both sides, and the semicircular bent portion 53 along the outer periphery of the guide rod 29 is inserted at the tip of each insertion piece 52. Is provided.

  The pair of insertion piece portions 52 in the set member 50 can be freely inserted and removed from a pair of openings 41 and 41 (see FIG. 5) formed in the disc portion 39 of the roller body 37. Further, as shown in FIG. 2, a tool insertion hole 42 is formed in the disk portion 39 at a position facing the head portion 22 of the arm support shaft 21.

  The power transmission device shown in the embodiment has the above-described structure. When the friction roller 20 is assembled, as shown in FIGS. 3 to 5, the engaging portion between the slide member 30 and the flange 34 of the pair of guide rods 29 is provided. The friction roller 20 is assembled in the set state of the set member 50 in which the pair of insertion pieces 52 of the set member 50 are inserted into X.

  Here, when the set member 50 is set, the slide member 30 is moved toward the swing arm 25 against the elasticity of the elastic member 33 by pushing in a part of the outer periphery of the roller body 37, and the slide member 30 is paired with the pair of slide members 30. In a state where a gap is formed in the engagement portion X between the flanges 34 of the guide rod 29, the pair of insertion pieces 52 of the set member 50 are moved from the pair of openings 41 formed in the disk portion 39 of the roller body 37. Each insertion piece 52 is inserted between the slide member 30 and the flange 34 of the pair of guide rods 29.

  By setting the set member 50 as described above, the pair of elastic members 33 is held in a contracted state, and the roller main body 37 is held in the pressed state even when the roller main body 37 is released.

  When the roller body 37 is in the pushing-in holding state as described above, the friction roller 20 is assembled to one side portion between the opposed portions of the drive pulley 11 and the driven pulley 18 shown in FIG. 1, and the screw of the arm support shaft 21 (see FIG. 2). The friction roller 20 can be incorporated by screwing the shaft 23 to the engine block 19 and screwing it.

  When the friction roller 20 is assembled as described above, the roller main body 37 is held in a pressed state by inserting the insertion piece 52 of the set member 50 into the engaging portion X. There is no need to hold it, and the friction roller 20 can be assembled very easily.

  Further, in the set state of the set member 50, the bent portions 53 provided at the respective distal end portions of the pair of insertion piece portions 52 are engaged with the guide rod 29 as shown in FIG. Therefore, there is no inconvenience that the set member 50 falls off when the friction roller 20 is assembled and the assembly work is hindered.

  FIGS. 1 to 5 show the assembled state of the friction roller 20. When the set member 50 is pulled out after the assembly, the slide member 30 swings along the pair of guide rods 29 due to the restoring elasticity of the pair of elastic members 33. The roller body 37 moves in a direction away from the moving arm 25, and the roller main body 37 comes into elastic contact with the driving pulley 11 and the driven pulley 18.

  When the roller body 37 moves toward the drive pulley 11 and the driven pulley 18 by the restoring elasticity of the pair of elastic members 33, the roller body 37 contacts the outer diameter surface of one of the drive pulley 11 and the driven pulley 18 first. When in contact, the swing arm 25 swings about the arm support shaft 21 by the pressing force of the elastic member 33 on the side away from the contact position. The swing arm 25 is displaced to a position corresponding to the position of each pulley 11, 18 by the swing, and the roller body 37 contacts the other pulley. As shown in FIG. 12, the drive pulley 11 and the driven pulley 18 The roller body 37 is elastically contacted equally to both.

  Thus, since the roller body 37 is elastically contacted equally to both the drive pulley 11 and the driven pulley 18 by the pair of elastic members 33, power transmission due to friction between the drive pulley 11 and the driven pulley 18 is stabilized. Can be done automatically.

  Here, in the power transmission device shown in FIG. 1, when the engine is started by driving the starter generator 12, the roller body 37 of the friction roller 20 is separated from the drive pulley 11 and the driven pulley 18. When the water pump 17 is driven, it is necessary to bring the roller body 37 into contact with the drive pulley 11 and the driven pulley 18 to transmit the power of the drive pulley 11 to the driven pulley 18. Thus, the position is displaced between the contact position contacting the drive pulley 11 and the driven pulley 18 and the separation position.

  2 indicates an example of a displacement device 45 that displaces the roller body 37 between the contact position and the separation position. In this displacement device 45, an eccentric cam 48 that is driven via a motor 46 and a speed reduction mechanism 47 is provided on the upper side of the slide member 30, and the eccentric cam 48 is rotated in contact with the slide member 30, so that the roller body 37 is displaced to a contact position and a separation position.

  In FIG. 2, the roller body 37 is held in the pushed-in state by the set member 50, so that a large gap is formed between the slide member 30 and the eccentric cam 48. In the state where the set member 50 is removed, the eccentric cam 48 is in a state where a contact or a delicate gap is formed on the upper surface of the slide member 30.

  In FIG. 5, the set member 50 is composed of a planar U-shaped belt-like plate provided with a pair of insertion piece portions 52 at both ends of the operation piece portion 51. However, the set member 50 is not limited to this. It is not something.

  FIG. 6 shows another example of the setting member 50. In this example, a pair of insertion piece portions 55 are provided at both ends of the U-shaped bent portion 54, and a semicircular bent portion 56 that can be engaged with the outer periphery of the guide rod 29 is provided at the distal end portion of each insertion piece portion 55. A flat U-shaped strip plate is used as the set member 50.

  In the set member 50 configured as described above, the engagement between the slide member 30 and the flange 34 of the pair of guide rods 29 shown in FIG. The slide member 30 is held at a position displaced toward the swing arm 25 by being inserted into and removed from the portion X. Further, the holding of the slide member 30 is released by pulling out the set member 50.

  In FIG. 4, the engaging portion X into which the set member 50 is inserted and removed is formed between the opposing portions of the flange 34 as a retaining portion provided at the other end of the slide member 30 and the guide rod 29. The joint portion X is not limited to this. The set member 50 is considered according to the engagement portion X, and at the same time, the formation position of the opening 41 through which the set member 50 is inserted and removed is considered.

  7 and 8 show another example of the engaging portion X. FIG. In this example, a set hole 57 a is provided from the outer periphery of both ends of the slide member 30 toward the rod insertion hole 31, and the guide rod 29 is inserted into the set hole 57 a when the slide member 30 is pushed toward the swing arm 25. A communicating pin hole 57b is provided, and the communicating hole portion between the pin hole 57b and the set hole 57a is used as the engaging portion X.

  When the communicating hole portion formed by the pin hole 57b and the set hole 57a is the engaging portion X, the set member 50 is a pin. As shown in FIG. 8, the set member 50 made of a pin has a U-shape that is provided with an insertion piece portion 59 that is inserted into each of the pair of engagement portions X at both ends of the operation piece portion 58. Alternatively, as shown in FIG. 9, a ring-shaped fingertip engaging portion 60 may be provided at the end of the single needle-shaped insertion piece 59.

  The slide member 30 is displaced toward the swing arm 25 by inserting the set member 50 composed of the pins as described above into the engagement portion X from the openings 41 and 41 formed in the disk portion 39 of the roller body 37. Can be held in a different position. Further, the holding of the slide member 30 can be released by pulling out the set member 50.

  10 and 11 show still another example of the engaging portion X. FIG. In this example, the engaging portion X is defined between the opposing surfaces of the swinging arm 25 and the friction body 38 in the roller body 37. For the engaging portion X, a prismatic set piece is used as the set member 50. A projecting piece 61 for restricting the amount of insertion is provided at one end portion of the set member 50 made of the set piece, and the inner side surface 62 is a concave arcuate surface along the outer periphery of the swing arm 25, Reference numeral 63 denotes a convex arcuate surface along the inner diameter surface of the friction ring 38.

  The slide member 30 can be held at a position displaced toward the swing arm 25 by inserting the set member 50 into the engaging portion X from the opening 41 formed in the disc portion 39 of the roller body 37. . Further, the holding of the slide member 30 can be released by pulling out the set member 50.

11 Crankshaft pulley (drive pulley)
18 Auxiliary pulley (driven pulley)
19 Engine block (for pulley support)
20 Friction roller 21 Arm support shaft 25 Swing arm 29 Guide rod 30 Slide member 33 Elastic member 34 Flange (prevention part)
37 Roller body 38 Friction wheel 39 Disc part 41 Opening part 50 Set member 51 Operation piece part 52 Insertion piece part 53 Bending part 55 Insertion piece part 56 Bending part 57a Set hole 57b Pin hole 58 Operation piece part 59 Insertion piece part 60 Fingertip Engagement part

Claims (8)

In the friction roller which is provided so as to be freely contacted and separated from the driving pulley and the driven pulley, and transmits the rotation of the driving pulley to the driven pulley by frictional contact with both pulleys.
An arm support shaft attached to the pulley support object, a swing arm supported to be swingable about the arm support shaft, and a pair of parallel arrangements having one end supported at both ends of the swing arm. A guide rod, a slide member slidably supported by the pair of guide rods, a circular friction wheel that houses the swing arm and the slide member, and can contact and separate from the drive pulley and the driven pulley. And a pair of the roller body, the roller shaft provided at the center of the disk portion rotatably supported by the slide member, A pair of elastic members supported by each of the guide rods to urge the slide member toward a retaining portion provided at the other end of the guide rod, and a disc portion of the roller body It has a set member that can be freely inserted into and removed from the engaging portion provided in the roller body from the formed opening, and that holds the elastic member in a contracted state in the inserted state. Friction roller.   The engaging portion is between the retaining portion at the other end of the guide rod and the facing portion of the slide member, and the set member is provided with a pair of insertion piece portions at both ends of the operation piece portion. 2. The friction roller according to claim 1, wherein the insertion piece portion is formed of a planar U-shaped belt-like plate inserted into the engagement portion so as to sandwich the pair of guide rods.   The engaging portion is between the retaining portion and the facing portion of the slide member, and the set member has a pair of insertion piece portions on both sides, and the pair of insertion piece portions extends the guide rod from both sides. The friction roller according to claim 1, comprising a flat U-shaped belt-like plate inserted into the engaging portion so as to be sandwiched.   4. The friction roller according to claim 2, wherein a semicircular bent portion along a semi-outer periphery of the guide rod is provided at a distal end portion of the insertion piece portion.   The engaging portion is formed on the outer periphery of each of the pair of set holes and the pair of guide rods formed from the outer periphery of both ends of the slide member toward the outer periphery of the guide rod. 2. The friction roller according to claim 1, wherein the sliding roller is a communicating hole portion of a radial pin hole that communicates with each of the pair of set holes by sliding toward, and the set member includes a pin that is inserted into and removed from the engaging portion. .   The friction roller according to claim 5, wherein the pin has a fingertip engaging portion at an end portion.   6. The friction roller according to claim 5, wherein the pin has a U-shaped flat surface in which an insertion piece portion to be inserted into each of the pair of engaging portions is provided at both ends of the operation piece portion.   2. The friction according to claim 1, wherein the engagement portion is a prismatic set piece in which the swinging arm and the roller main body are opposed to each other on the friction wheel and the set member is inserted into and removed from the engagement portion. roller.

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