JP2016094956A - Power transmission roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably transmit power generated by friction between a drive roller and a driven roller, and to reduce the size of a power transmission mechanism.SOLUTION: A power transmission roller comprises: a roller main body 2 which contacts with a drive roller D and a driven roller S; an oscillation shaft 3 fixed to a vehicle main body side; an oscillation arm 4 which is arranged at an inside diameter side of the roller main body 2, and arranged at the oscillation shaft 3 so as to be oscillatory; a roller bearing 5 which makes the roller main body 2 rotatable; a pair of shafts 6, 6 for guiding a receiving member 7 to a direction in which the receiving member 7 contacts with and separates from the oscillation arm 4; a slide member 8 interposed between the oscillation arm 4 and the receiving member 7; and a pair of energization members 9, 9 interposed between the oscillation arm 4 and the slide member 8.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a power transmission roller that is interposed between a driving roller and a driven roller and transmits a rotational force of the driving roller to the driven roller by a frictional force.

  Conventionally, in an engine power transmission mechanism, power transmission between an engine crank and auxiliary equipment such as a water pump (WP) and an idling stop generator (ISG) is bridged via an idler pulley. I went through the auxiliary belt. In this case, since the auxiliary machinery always rotates with the rotation of the crank, for example, when the WP does not need to be rotated as in the warm-up operation of the engine, the belt rotates unnecessarily. Reduction in fuel consumption due to loss and unnecessary rotation of the pulley has been a problem.

  In order to solve this problem, for example, in FIG. 1 of Patent Document 1, instead of using an auxiliary machine belt, power transmission is performed between a driving roller (crankshaft pulley 4) and a driven roller (friction pulley 14). A configuration is disclosed in which an idler roller (friction wheel 17) is interposed and the rotational force of the driving roller is transmitted to the driven roller by the frictional force of the idler roller. Unlike the accessory belt, the idler roller can freely change the contact / separation state between the driving roller and the driven roller by advancing and retracting its position.

  For example, when the rollers (D, S1, S2, Rs) such as the driving roller D (for example, crank roller) and the driven roller S1 (for example, ISG roller) are arranged as shown in FIG. 10, the idler roller Ri is set to the arrow d1. When moved in the direction, the idler roller Ri can be brought into contact with the driving roller D and the driven roller S1, and power can be transmitted from the driving roller D to the driven roller S1 via the idler roller Ri. On the other hand, when the idler roller Ri is moved in the direction of the arrow d2, the idler roller Ri is separated from the driving roller D and the driven roller S1, and the transmission of power can be interrupted.

  A mechanism (cam actuator) for advancing and retracting the idler roller to evenly contact the driving roller and the driven roller will be described with reference to FIG. The cam actuator shown in the figure decelerates the rotation of the motor 1 by the planetary reduction gear R, converts the decelerated rotation into the reciprocating motion of the connecting rod 201 by the eccentric cam 3, and is supported at the end of the connecting rod 201. The pulley 300 is advanced and retracted. By moving the pulley 300 back and forth, the transmission or interruption of power from the driving roller to the driven roller is controlled in accordance with various conditions such as the operating state of the engine, thereby improving fuel efficiency.

  The connecting rod 201 is configured to be swingable by a slight amount from the axial direction in the middle. In this way, by enabling swinging, the connecting rod 201 swings so that the contact force between the pulley 300 and each roller becomes substantially equal when the pulley 300 contacts the driving roller and the driven roller. Thus, the pulley 300 is positioned at the optimum position.

Japanese Patent No. 48991414 Japanese Patent No. 4809341

  The cam actuator according to Patent Document 2 is configured to grip the rotation shaft of the pulley 300 (idler roller), and its swing fulcrum is located outside the pulley 300 (near the center in the length direction of the connecting rod 201). . For this reason, it is necessary to secure a space for swinging around the pulley 300, which hinders downsizing of the power transmission mechanism and impairs the freedom of system layout. Further, since the pulley 300 is positioned by the swinging of the one connecting rod 201, there is a risk of twisting around the axis of the connecting rod 201, and poor contact between the pulley 300 and the driving roller and the driven roller. There is also a problem that power transmission due to friction tends to become unstable.

  In addition, the driving roller and the driven roller are not necessarily perfect circles, and in that case, self-excited vibration and resonance are likely to occur with these rotations. For this reason, the contact state between the driving roller and the driven roller and the pulley 300 becomes unstable (the pulley 300 jumps in small increments due to self-excited vibration or resonance), and there is a problem that power transmission cannot be stably performed. .

  Accordingly, an object of the present invention is to stably perform power transmission by friction between the driving roller and the driven roller and to reduce the size of the power transmission mechanism.

  In order to solve this problem, according to the present invention, in the power transmission roller that is interposed between the driving roller and the driven roller and transmits the rotational force of the driving roller to the driven roller side by a frictional force, a receiving member A roller main body held by the drive roller and the driven roller, and a swing shaft fixed to the vehicle main body side, and disposed on the inner diameter side of the roller main body. A swinging arm provided movably, a roller bearing for rotatably supporting the roller body, and a pair of shafts for guiding the receiving member in a direction in which the receiving member contacts and separates from the swinging arm. A sliding member provided between the swinging arm and the receiving member, and a pair of urging members provided between the swinging arm and the sliding member. ,Previous The receiving member has an inclined surface that is inclined with respect to the urging direction of the urging member, and the sliding member has an inclined surface that comes into contact with the inclined surface of the receiving member. Along with the relative movement toward the moving arm, the sliding member receives a reaction force from the receiving member via the both inclined surfaces, and the sliding member is caused by the reaction force and the urging force from the urging member. The power transmission roller is configured to be pressed against the swing arm side, and to cause friction between the swing arm and the receiving member and the sliding member by the pressing.

  According to this configuration, when at least one of the driving roller or the driven roller contacts the roller body of the power transmission roller, the pair of urging members that contact the sliding member by the contact force independently expand and contract. The member is guided by the shaft so as to contact and separate from the swing arm, and the swing arm swings around the swing axis. Due to the contact and separation of the receiving member with respect to the swing arm and the swing of the swing arm, the roller body is displaced to a position corresponding to the position of each roller, and between the drive roller and the power transmission roller and the driven roller. Each contact force with the power transmission roller is substantially equal, and in this state, power can be stably transmitted from the driving roller to the driven roller.

  In addition, by disposing the swing arm on the inner diameter side of the roller body, the swing shaft and roller bearing for swinging the swing arm are also disposed on the inner diameter side of the roller body. The power transmission roller including the mechanism can be downsized. Further, since the receiving member is guided by the pair of shafts with respect to the swing arm, the twist between the swing arm and the receiving member is hardly generated at the time of urging, and the drive roller and the driven roller are prevented from being twisted. The power transmission roller can be brought into contact with certainty. For this reason, power transmission by friction between the driving roller and the driven roller can be stably performed.

  Further, since the sliding member is interposed between the swing arm and the receiving member, the roller body moves toward the drive roller and the driven roller (that is, the receiving member protrudes from the swing arm). When moving, most of the urging force transmitted from the urging member to the sliding member is directly transmitted as a pressing force to the receiving member via the inclined surface formed on the sliding member and the receiving member. At this time, the reaction force of the pressing force toward the receiving member side is exerted on the swing arm side. However, the sliding member is firmly supported in the expansion / contraction direction by the urging member, and the sliding member is caused by the reaction force. The pressing force to the swing arm is small. For this reason, the frictional force acting between the swing arm and the receiving member and the sliding member is small, and the roller main body can be quickly projected and brought into contact with the driving roller and the driven roller.

  On the other hand, when the roller main body moves away from the driving roller and the driven roller (that is, when the receiving member moves so as to be pushed into the swing arm side), the sliding member acts as a reaction force from the receiving member. Since the pressing force directly acts and also receives a biasing force from the biasing member, the pressing force exerts a strong pressing force from the sliding member to the swing arm side. For this reason, a large frictional force is generated between the swing arm and the receiving member and the sliding member, and when the force that the roller main body tries to separate from the driving roller and the driven roller acts, the movement of the roller main body is delayed. The function as a damper is exhibited.

  In this way, by providing the damper function, for example, even when the driving roller and the driven roller are not completely perfect circles, and the self-excited vibration or resonance occurs with the rotation, the driving roller and the driven roller And the roller main body can be stably maintained, and power can be reliably transmitted from the drive roller to the driven roller. The strength of the damper function can be changed as appropriate by changing the inclination angle of the inclined surface formed on the receiving member and the sliding member.

  In each of the above configurations, it is preferable that a resin material is provided on at least one of the surfaces of the sliding member that slides with the swing arm and the receiving member.

  Thus, by providing the resin material, it is possible to stabilize the frictional resistance between the swing arm and the receiving member and the sliding member, and to smoothly advance and retract the roller body. This resin material can be formed on the sliding surface of the sliding member by coating, or the sliding member itself can be made of a resin material. Moreover, the composite material of a resin material and another raw material can also be employ | adopted.

  In each of the above-described configurations, it is preferable that a protrusion for holding the biasing member is formed on the sliding member.

  Thus, by forming the projection, the urging member can be stably held and brought into contact with the sliding member, and the roller body can be smoothly advanced and retracted.

  In each of the above configurations, an auxiliary biasing member that biases the receiving member in a direction away from the swing arm may be provided coaxially with the shaft.

  Thus, by providing the auxiliary urging member and urging the receiving member, the urging force by the urging member can be supplemented, and the roller body can be stably brought into contact with the driving roller and the driven roller.

  In the present invention, the roller main body that contacts the driving roller and the driven roller, the swing shaft fixed to the vehicle main body, the inner diameter side of the roller main body, and swingably provided on the swing shaft. A swing arm, a roller bearing that allows the roller main body to rotate, a pair of shafts that guide the receiving member in a direction in which the receiving member contacts and separates from the swing arm, and the swing arm; A power transmission roller is provided that includes a sliding member provided between the receiving member and a pair of biasing members provided between the swing arm and the sliding member. did.

  At least one of the driving roller or the driven roller contacts the roller body of the power transmission roller, and the pair of urging members that contact the sliding member are independently expanded and contracted by the contact force, and the receiving member is guided by the shaft. As the swing arm swings around the swing axis, the roller body is displaced to a position corresponding to the position of each roller, and power is transmitted to the drive roller. The contact forces between the rollers and between the driven roller and the power transmission roller are substantially equal, and in this state, power can be stably transmitted from the driving roller to the driven roller.

  Further, by arranging the swing arm on the inner diameter side of the roller body, the swing shaft and the roller bearing for swinging the swing arm are also disposed on the inner diameter side of the roller body. The power transmission roller including the mechanism can be downsized. Further, since the receiving member is guided by the pair of shafts with respect to the swing arm, the twist between the swing arm and the receiving member is hardly generated at the time of urging, and the drive roller and the driven roller are prevented from being twisted. The power transmission roller can be brought into contact with certainty. For this reason, power transmission by friction between the driving roller and the driven roller can be stably performed.

  Further, a sliding member is interposed between the swing arm and the receiving member, and when the swing arm and the receiving member are separated from each other, the receiving member is moved smoothly, and when the swing arm and the receiving member approach each other Has a damper function that slows down the movement of the receiving member due to the frictional force. As a result, even when the driving roller and the driven roller are not completely perfect circles, and the self-excited vibration or resonance occurs with the rotation, the contact state between the driving roller and the driven roller and the roller body is stably maintained. Therefore, power can be reliably transmitted from the driving roller to the driven roller.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows 1st embodiment of the power transmission roller which concerns on this invention, Comprising: (a) is a front view, (b) is sectional drawing which follows the bb line in (a). 1A is a side view, and FIG. 1B is a rear view of the power transmission roller shown in FIG. Sectional drawing which follows the III-III line in FIG.1 (b) of the power transmission roller shown to Fig.1 (a). 1 is a perspective view of the power transmission roller shown in FIG. 1 is an exploded perspective view of the power transmission roller shown in FIG. The top view which shows the effect | action of the power transmission roller shown to Fig.1 (a) It is a longitudinal cross-sectional view which shows the effect | action of the damper of the power transmission roller shown to Fig.1 (a), Comprising: (a) is the state where the damper function is exhibited, (b) is the state where the damper function is not exhibited. It is a top view in the state where an eccentric cam mechanism is provided together with the power transmission roller, where (a) is a power transmission state and (b) is a power cut state The front view which shows 2nd embodiment of the power transmission roller which concerns on this invention Plan view showing the arrangement of each roller

  1 to 5 show a first embodiment of a power transmission roller 1 according to the present invention. The power transmission roller 1 is interposed between a driving roller D such as a crank and a driven roller S that operates auxiliary equipment such as a water pump (WP) and an idling stop generator (ISG). The rotational force is transmitted to the driven roller S side by frictional force (see FIG. 6). The roller body 2, the swing shaft 3, the swing arm 4, the roller bearing 5, the pair of shafts 6, 6, A pair of sliding members 8 interposed between the moving arm 4 and the receiving member 7 holding the roller body 2 to generate a frictional force, and a pair provided between the swinging arm 4 and the sliding member 8. The urging members 9 and 9 are main components. The functions as the driving roller D and the driven roller S are not unique to each roller such as a crank. For example, the ISG may function as the driving roller D and the crank may function as the driven roller S.

  The roller body 2 is a bottomed cylindrical member that is in direct contact with the driving roller D and the driven roller S. The contact surface of the roller body 2 with the driving roller D and the driven roller S is a knurled portion 2a for increasing the frictional force (see FIG. 2A). In addition, a plurality of holes 2b are formed in the cylindrical bottom portion of the roller body 2, and the weight of the roller body 2 is reduced. A bearing hole 2c is formed at the center of rotation of the roller body 2. By inserting the bearing holding member 10 into the inner ring 5a and the bearing hole 2c of the roller bearing 5 (in this embodiment, a ball bearing), the inner ring 5a side The roller main body 2 and the outer ring 5b of the roller bearing 5 are relatively rotatable (see FIG. 1B). As described above, by configuring the roller body 2 to rotate together with the inner ring 5a, the load on the roller bearing 5 is reduced, and the life of the roller bearing 5 can be extended.

  A receiving member 7 is fitted into the outer ring 5 b of the roller bearing 5. The receiving member 7 is formed with a pair of through holes 7 a and 7 a at symmetrical positions around the roller bearing 5. A shaft 6 is inserted into each through hole 7 a, and the head side (the lower end side of the shaft 6 in FIG. 3) is fixed to a swing arm 4 that is swingably provided by a swing shaft 3. ing. On the other hand, the tip end portion of the shaft 6 (in FIG. 3, the upper end side of the shaft 6) can be protruded from the receiving member 7 while being prevented from being detached by the retaining ring 6a. As described above, since the receiving member 7 is guided by the pair of shafts 6 and 6 with respect to the swing arm 4, the twist between the swing arm 4 and the receiving member 7 during the biasing hardly occurs. The power transmission roller 1 can be reliably brought into contact with the driving roller D and the driven roller S.

  On the surface of the receiving member 7 facing the swinging arm 4, an inclined surface 7 b is formed such that the distance from the swinging arm 4 becomes closer toward the center of the receiving member 7. On the other hand, the sliding member 8 is formed with an inclined surface 8 a that abuts on the inclined surface 7 b formed on the receiving member 7. The sliding member 8 is provided so as to be interposed between the swing arm 4 and the receiving member 7, and the inclined surface 7 b formed on the receiving member 7 and the inclined surface 8 a formed on the sliding member 8 are mutually connected. It is in a contact state.

  The material of the sliding member 8 is not particularly limited, but it is preferable to use a resin material. By using the resin material, it is possible to stabilize the frictional resistance between the sliding member 8, the swing arm 4 and the receiving member 7, and the roller body 2 can be smoothly advanced and retracted. Instead of forming the entire sliding member 8 from a resin material, the sliding surface between the swing arm 4 and the receiving member 7 of the sliding member 8 is formed by coating, or other materials such as a resin material and a metal material are used. It can also be a composite material with the material.

  A biasing member 9 (coil spring) is provided between the swing arm 4 and the sliding member 8. The urging direction of the urging member 9 is a direction orthogonal to the relative movement direction of the receiving member 7 with respect to the swing arm 4. The normal lines of the inclined surfaces 7b and 8a formed on the receiving member 7 and the sliding member 8 make an angle of about 60 degrees with the urging direction, and the urging member 9 presses the sliding member 8. Then, the pressing force is converted into a force in a direction in which the receiving member 7 is urged away from the swing arm 4 by the inclined surfaces 7b and 8a. The urging member 9 is held by being fitted into a protrusion 8 b formed on the sliding member 8. Thereby, the urging member 9 can be stably held, and the roller body 2 can be smoothly advanced and retracted.

  In this embodiment, the roller bearing 5, the sliding member 8, and the biasing member 9 are disposed in a plane that passes through the center in the width direction of the friction surface (knurled portion 2 a) of the roller body 2. By arranging in this way, when the receiving member 7 (roller bearing 5) is urged by the urging member 9, a moment due to the urging force is prevented, and the roller body 2 is inclined due to this moment. Can be prevented. Therefore, the power transmission roller 1 can be reliably brought into contact with the driving roller D and the driven roller S, and power transmission by friction between the driving roller D and the driven roller S can be stably performed. In addition, it is possible to prevent problems such as wear of the roller body 2 due to poor contact between the rollers D and S.

  The oscillating shaft 3, the oscillating arm 4, the roller bearing 5, the sliding member 8, and the urging member 9 are all arranged on the inner diameter side (inside the cylinder) of the roller body 2. For this reason, size reduction of the power transmission mechanism including this power transmission roller 1 can be achieved. The power transmission roller 1 is configured such that the swing shaft 3 is fixed to a cover (not shown) that covers the driving roller D and the driven roller S via a spacer 11, and the driving roller is fitted into a predetermined position. It is arranged at a predetermined position between D and the driven roller S. In this case, the power transmission roller 1 is provided with a mechanism (not shown) that can freely hold and release the biasing member 9 in a contracted state (a state where the receiving member 7 approaches the swing arm 4 side). By providing, it is possible to prevent the power transmission roller 1 from contacting the driving roller D and the driven roller S when the cover is fitted, and the power transmission roller 1 can be attached easily and smoothly.

  In the above description, the configuration in which the power transmission roller 1 is provided on the cover side has been described. However, if the mounting space can be secured on the engine block side, the power transmission roller 1 may be provided on the engine block.

  As described above, when at least one of the drive roller D or the driven roller S comes into contact with the roller body 2 of the power transmission roller 1, a pair of urging members 9 that urge the sliding member 8 by the contact force. 9 is independently expanded and contracted, and the receiving member 7 is guided by the pair of shafts 6 and 6 so as to come in contact with and separate from the swing arm 4, and the swing arm 4 swings around the swing shaft 3. Move. By this swinging, as shown in FIG. 6, the roller body 2 is displaced to a position corresponding to the position of each of the rollers D and S, and between the driving roller D and the power transmission roller 1 and the driven roller S and the power. The respective contact forces with the transmission roller 1 are substantially equal, and power can be stably transmitted from the driving roller D to the driven roller S in this state.

  The action of the sliding member 8 provided on the power transmission roller 1 as a damper will be described with reference to FIGS. When the roller body 2 (the receiving member 7) moves toward the driving roller D and the driven roller S (that is, when the receiving member 7 moves so as to protrude from the swing arm 4), the biasing member 9 The force F is transmitted to the sliding member 8, and the receiving member 7 and the sliding member 8 are respectively provided with a pressing force W for separating the receiving member 7 from the swing arm 4 via inclined surfaces 7b and 8a formed on the sliding member 8, respectively. It is transmitted to 7. At this time, the reaction force of the pressing force W toward the receiving member 7 is exerted on the swing arm 4 side. However, the sliding member 8 is firmly supported by the biasing member 9 in the expansion / contraction direction, and the reaction force The pressing force P applied to the swing arm 4 of the sliding member 8 due to is small (see FIG. 7B). For this reason, the frictional force acting between the swing arm 4 and the receiving member 7 and the sliding member 8 is small, and the roller main body 2 can be quickly projected and brought into contact with the driving roller D and the driven roller S. it can.

  On the other hand, when the roller body 2 (the receiving member 7) moves away from the driving roller D and the driven roller S (that is, when the receiving member 7 moves so as to be pushed into the swing arm 4 side), it slides. A pressing force W as a reaction force from the receiving member 7 directly acts on the member 8 and also receives an urging force from the urging member 9, so that the urging arm 4 side from the sliding member 8 by this pressing force W. A strong pressing force P acts on (see FIG. 7A). For this reason, a large frictional force is generated between the swing arm 4 and the receiving member 7 and the sliding member 8, and when the roller main body 2 is subjected to a force to move away from the driving roller D and the driven roller S, the roller The action as a damper for delaying the movement of the main body 2 is exhibited.

  Thus, by providing the damper function, for example, even when the driving roller D and the driven roller S are not completely perfect circles, and the self-excited vibration and resonance occur with the rotation, the driving roller D In addition, the contact state between the driven roller S and the roller body 2 can be stably maintained, and power can be reliably transmitted from the driving roller D to the driven roller S.

  As shown in FIGS. 8A and 8B, an eccentric cam 12 that rotates around an eccentric shaft 12a is provided in the vicinity of the roller bearing 5 of the power transmission roller 1 as shown in FIGS. Can do. The eccentric shaft 12a is connected to a motor (not shown) via a speed reduction mechanism 13 such as a planetary gear mechanism. In a state where the eccentric cam 12 is not in contact with the roller bearing 5 (see FIG. 8A), the power transmission roller 1 is in contact with the driving roller D and the driven roller S, and the power from the driving roller D to the driven roller S. Transmission is made. On the other hand, the eccentric cam 12 abuts on the roller bearing 5 and resists the urging force of the urging member 9 provided on the power transmission roller 1 (so that the urging member 9 is compressed). When pushed in, the power transmission roller 1, the driving roller D, and the driven roller S are separated from each other (see FIG. 8B), and the power transmission from the driving roller D to the driven roller S is interrupted.

  Thus, by providing the eccentric cam 12, power transmission and cutting between the driving roller D and the driven roller S can be performed easily and smoothly. Even if various actuators are employed instead of using the eccentric cam 12 and the roller bearing 5 is pushed by this actuator, the same effect can be obtained. It should be noted that the roller bearing 5 is not necessarily pushed directly by the eccentric cam 12 but may be pushed via a pressing member (not shown) provided on the roller bearing 5. .

  FIG. 9 shows a second embodiment of the power transmission roller 1 according to the present invention. The power transmission roller 1 includes a roller main body 2, a swing shaft 3, a swing arm 4, a roller bearing 5, a pair of shafts 6 and 6, and a receiving member 7 that holds the roller body 2. A sliding member 8 that intervenes to generate a frictional force, and a pair of biasing members 9 and 9 that are provided between the swing arm 4 and the sliding member 8 are the main constituent elements. The configuration is the same as that of the power transmission roller 1 according to the first embodiment, but an auxiliary biasing member 14 that biases the receiving member 7 in a direction away from the swing arm 4 is provided coaxially with the shaft 6. Are different.

  Thus, by providing the auxiliary urging member 14, the urging force of the urging member 9 against the receiving member 7 can be supplemented, and the roller body 2 can be stably brought into contact with the driving roller D and the auxiliary roller S. .

  The power transmission roller 1 according to each of the above embodiments is merely an example, and the power transmission by friction between the driving roller D and the driven roller S is stably performed, and the power transmission mechanism is downsized. As long as the problems of the present invention can be solved, it is allowed to change the shape and arrangement of each component and to add additional components.

DESCRIPTION OF SYMBOLS 1 Power transmission roller 2 Roller body 2a Knurled part 2b Hole 2c Bearing hole 3 Swing shaft 4 Swing arm 5 Roller bearing 5a Inner ring 5b Outer ring 6 Shaft 6a Retaining ring 7 Receiving member 7a Through hole 7b Inclined surface 8 Sliding member 8a Inclined surface 8b Protruding portion 9 Biasing member 10 Bearing holding member 11 Spacer 12 Eccentric cam 12a Eccentric shaft 13 Deceleration mechanism 14 Auxiliary urging member D Driving roller S Follower roller

Claims (4)

In a power transmission roller that is interposed between the driving roller (D) and the driven roller (S) and transmits the rotational force of the driving roller (D) to the driven roller (S) side by a frictional force.
A roller body (2) that is held by a receiving member (7) and that can freely contact and separate from the drive roller (D) and the driven roller (S);
A swing shaft (3) fixed to the vehicle body side;
A swing arm (4) disposed on the inner diameter side of the roller body (2) and swingably provided on the swing shaft (3);
A roller bearing (5) for rotatably supporting the roller body (2);
A pair of shafts (6, 6) for guiding the receiving member (7) in a direction in which the receiving member (7) is in contact with and away from the swing arm (4);
A sliding member (8) provided between the swing arm (4) and the receiving member (7);
A pair of biasing members (9, 9) provided between the swing arm (4) and the sliding member (8);
The receiving member (7) has an inclined surface (7b) inclined with respect to the urging direction of the urging member (9), and the sliding member (8) is provided with the receiving member (7). ), And the sliding member (8) moves along with the relative movement of the receiving member (7) toward the swing arm (4). A reaction force is received from the receiving member (7) via the both inclined surfaces (7b, 8a), and the sliding member (8) is swayed by the reaction force and the urging force from the urging member (9). It is pressed to the moving arm (4) side, and this pressing causes friction between the swing arm (4) and the receiving member (7) and the sliding member (8). Power transmission roller.   The resin material is provided on at least one of the surfaces of the sliding member (8) sliding with the swing arm (4) and the receiving member (7). The described power transmission roller.   The power transmission roller according to claim 1 or 2, wherein a projection (8b) for holding the biasing member (9) is formed on the sliding member (8).   An auxiliary biasing member (14) for biasing the receiving member (7) in a direction away from the swing arm (4) is provided coaxially with the shaft (6). The power transmission roller according to any one of 1 to 3.

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