WO2016194998A1

WO2016194998A1 - Power transmission roller

Info

Publication number: WO2016194998A1
Application number: PCT/JP2016/066358
Authority: WO
Inventors: 中尾　吾朗
Original assignee: Ntn株式会社
Priority date: 2015-06-05
Filing date: 2016-06-02
Publication date: 2016-12-08
Also published as: JP2017002931A; JP6552877B2

Abstract

A power transmission roller comprises: a roller body (2); a housing (6); a bearing (5) for enabling the roller body (2) and the housing (6) to rotate relative to each other; a rocking shaft (3) affixed to the vehicle main body side; a rocking arm (4) provided in a rockable manner to the rocking shaft (3); a pair of housing pressing members (7, 7) for pressing the roller body (2) so that the force of contact of the roller body (2) with a drive roller (D) and the force of contact of the roller body (2) with a driven roller (S) are in balance with each other; resistance bodies (8) for pressing the shafts (7a) of the housing pressing members (7) in the axial direction of the shafts (7a) by means of gripping force which is the combination of the pressing force of the housing pressing members (7) and press-on force applied by the housing (6) in the direction opposite the direction of the pressing force; and sleeves (9) for pressing the resistance bodies (8) against the pressing force of the housing pressing members (7). The sleeves (9) press the resistance bodies (8) to release the contact between the housing (6) and the resistance bodies (8).

Description

Power transmission roller

The present invention relates to a power transmission roller that is interposed between a driving roller and a driven roller and transmits the 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, as shown in FIG. 1 of the following Patent Document 1, instead of using an auxiliary machine belt, power transmission is performed between a driving roller (crankshaft pulley) and a driven roller (friction pulley). A technique is disclosed in which the idler roller (friction wheel) 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. When moved in the direction, the idler roller Ri, the driving roller D and the driven roller S1 come into contact with each other, 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, the driving roller D, and the driven roller S1 are separated from each other, so that transmission of power can be interrupted.

A mechanism (cam actuator) for advancing and retracting the idler roller to uniformly contact the driving roller and the driven roller will be described with reference to FIG. The cam actuator shown in this figure decelerates the rotation of the motor with a planetary speed reducer, converts the reduced rotation into reciprocating movement of the connecting rod by an eccentric cam, and advances and retracts the pulley supported by the end of the connecting rod. It is made to let you. By moving the pulley 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.

This connecting rod is configured to be swingable by a slight amount from the shaft axis direction in the middle. In this way, by allowing the swing, the connecting rod swings so that the contact force between the pulley and each roller is substantially equal when the pulley contacts the drive roller and the driven roller. The pulley 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 rotating shaft of a pulley (idler roller), and its swing fulcrum is located outside the pulley (near the center in the length direction of the connecting rod). For this reason, it is necessary to secure a space for swinging around the pulley, which causes a problem in miniaturization of the power transmission mechanism and impairs the degree of freedom of the system layout. In addition, since the pulley is positioned by swinging one connecting rod, there is a risk of twisting around the shaft of the connecting rod, resulting in poor contact between the pulley, the driving roller and the driven roller, and friction. There is also a problem that power transmission due to is likely to be 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 becomes unstable (the pulley jumps in small increments due to self-excited vibration or resonance), and power transmission cannot be stably performed. There is also a problem that the power transmission between the roller and the driven roller cannot be smoothly turned on and off.

Therefore, the present invention aims to reduce the size of the power transmission mechanism, stably perform power transmission by friction between the driving roller and the driven roller, and further input power transmission between the driving roller and the driven roller. The task is to cut smoothly.

In order to solve this problem, in 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 frictional force, the drive A roller body contacting and separating from the roller and the driven roller, a housing provided on an inner diameter side of the roller body, a bearing provided at a rotation center of the roller body, and relatively rotatable between the roller body and the housing. A swing shaft fixed to the vehicle body side, a swing arm disposed on the inner diameter side of the roller body and swingably provided on the swing shaft, and a shaft passing through the housing and the swing arm And an elastic body provided coaxially with the shaft and biasing the housing so that the housing is separated from the swing arm, A pair of housing urging members that urge the roller body to a predetermined position between the driving roller and the driven roller so that the abutting force of both rollers is balanced, and the shaft is inserted into the shaft. An urging force and a resistor that presses the shaft in the axial direction by a pinching force between the urging force and a pressing force from the housing that acts in an opposite direction to the axial direction of the shaft; and the resistor A sleeve that presses against the urging force of the elastic body, and forms a first inclined surface with respect to the axial direction of the shaft on the surface side of the resistor that contacts the housing, A second inclined surface that contacts the first inclined surface is formed on a surface facing the resistor, and the pressing of the resistor by the sleeve causes the first inclined surface and the second inclined surface. To constitute a power transmission roller, wherein done is that to release the contact between.

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 housing urging members independently expand and contract by the contact force, and the swing arm swings. Swing around the axis. By this swing, the swing arm is displaced to a position corresponding to the position of each roller, and the contact force between the driving roller and the power transmission roller and between the driven roller and the power transmission roller is substantially equal. 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 the bearing for swinging the swing arm are also disposed on the inner diameter side of the roller body. The power transmission roller including the whole can be downsized. Furthermore, the housing urging member is configured as a pair, so that the housing urging member is hardly twisted at the time of urging, and the power transmission roller can be reliably brought into contact with the driving roller and the driven roller. Become. For this reason, power transmission by friction between the driving roller and the driven roller can be stably performed. In addition, a bearing can be provided in the middle of the pair of housing urging members, and stability during rotation of the bearing can be ensured.

When the roller body moves toward the driving roller and the driven roller (that is, when the housing moves so as to protrude from the swing arm), the biasing force from the elastic body and the force acting on the housing are in the same direction. Thus, the pressing force in the shaft axial direction hardly acts on the resistor, and the deformation of the resistor in the shaft axial direction is small. For this reason, almost no frictional force acts between the resistor and the shaft, 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 body moves away from the driving roller and the driven roller (that is, when the housing moves so as to be pushed into the swing arm side), the biasing force from the elastic body and the biasing force are opposed to each other. The reaction force from the housing that occurs in the direction that is applied acts on the resistor, and a reverse pressing force in the axial direction of the shaft acts on the resistor. By this pressing force, the resistor is greatly deformed to the shaft side, and the frictional force between the resistor and the shaft is increased. For this reason, when the force which leaves | separates from a drive roller and a driven roller acts on a roller main body, the function as a damper which delays a motion of a roller main body is exhibited.

This function as a damper also occurs when the power transmission mechanism is turned off, that is, when the housing is displaced in a direction away from the driving roller and the driven roller to separate the roller body from the driving roller and the driven roller. obtain. At this time, the damper function can be temporarily stopped by pressing the resistor with the sleeve so as to release the contact between the first inclined surface and the second inclined surface. Thus, by providing the stop function of the damper function, the power transmission mechanism can be smoothly switched from the on state to the off state.

Thus, by providing a damper function and allowing the damper function to be temporarily stopped, for example, the driving roller and the driven roller are not completely perfect circles, and self-excited vibrations occur as they rotate. Even when resonance occurs, the driving roller and the driven roller and the roller main body are stably maintained in contact with each other to reliably transmit power from the driving roller to the driven roller, and the operating status of the engine, etc. The power transmission mechanism can be smoothly turned off according to the various conditions.

In the above configuration, it is preferable that a movement limiting member for limiting the moving range of the sleeve within a predetermined range is formed on the housing.

Thus, by restricting the movement range, when the power transmission mechanism is turned on, the sleeve inadvertently biases the resistor against the biasing force of the elastic body, and the damper function decreases. In addition, when the power transmission mechanism is switched from the on state to the off state, the sleeve is largely separated from the resistor, thereby preventing the pressing of the resistor by the sleeve from being delayed.

In each of the above configurations, it is preferable that a sleeve urging member for urging the sleeve in a direction away from the resistor is provided.

Thus, by energizing the resistor, when the power transmission mechanism is turned on, the sleeve inadvertently energizes the resistor against the urging force of the elastic body, and the damper function is lowered. Can be prevented.

According to the present invention, in a 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, the driving roller and the driven roller are in contact with and separated from each other. A roller main body, a housing provided on an inner diameter side of the roller main body, a bearing provided at a rotation center of the roller main body and relatively rotatable between the roller main body and the housing, and fixed to the vehicle main body side. A swinging shaft, a swinging arm disposed on the inner diameter side of the roller main body and swingably provided on the swinging shaft, a shaft passing through the housing and the swinging arm, and provided coaxially with the shaft And an elastic body that urges the housing so that the housing is separated from the swing arm, and the roller body is the drive roller. A pair of housing urging members for urging so that the abutting force between the two rollers is balanced at a predetermined position between the driven roller, an urging force by the elastic body, inserted through the shaft, and the urging force; Is a resistor that presses the shaft in the axial direction by a sandwiching force with a pressing force from the housing acting in the opposite direction to the axial direction of the shaft, and the biasing force by the elastic body And a first inclined surface with respect to the axial direction of the shaft on the surface side of the resistor that contacts the housing, and on the surface of the housing facing the resistor Forming a second inclined surface in contact with the first inclined surface, so that the pressing of the resistor by the sleeve releases the contact between the first inclined surface and the second inclined surface. To constitute a power transmission roller, characterized in that it is made.

As described above, when the swing arm swings around the swing shaft, the rough position of the power transmission roller with respect to the drive roller and the driven roller is determined. And the pair of housing urging members independently expand and contract in accordance with the contact force between the driven roller and the power transmission roller. Positioning can be performed easily and smoothly.

Further, by disposing the swing arm on the inner diameter side of the roller body, the swing shaft and the bearing for swinging the swing arm are also disposed on the inner diameter side of the roller body. The power transmission roller including the whole can be downsized. Furthermore, the housing urging member is configured as a pair, so that the housing urging member is hardly twisted at the time of urging, and the power transmission roller can be reliably brought into contact with the driving roller and the driven roller. Become. For this reason, power transmission by friction between the driving roller and the driven roller can be stably performed. In addition, a bearing can be provided in the middle of the pair of housing urging members, and stability during rotation of the bearing can be ensured.

In addition, by providing a resistor on the shaft and providing a damper function, the drive roller and driven roller are not completely perfect circles, and even when self-excited vibration or resonance occurs due to their rotation, this drive The contact state between the roller and the driven roller and the roller body can be stably maintained, and power can be reliably transmitted from the driving roller to the driven roller.

In addition, when the sleeve for pressing the resistor is provided and the power transmission mechanism is turned off, the first inclined surface formed on the resistor by pressing the resistor with the sleeve and the second inclined surface formed on the housing Since the damper function is temporarily stopped by releasing the contact with the power transmission mechanism, the power transmission mechanism can be smoothly switched from the on state to the off state.

A longitudinal sectional view showing an embodiment of a power transmission roller according to the present invention Sectional view along line II-II in Fig. 1 of the power transmission roller The longitudinal cross-sectional view which shows the principal part of a power transmission roller same as the above which shows the state by which the damper function is exhibited by the frictional force between a shaft and a resistor. The longitudinal cross-sectional view which shows the principal part of a power transmission roller same as the above which shows the state where the frictional force between a shaft and a resistor is small and the damper function is not exhibited. The longitudinal cross-sectional view which shows the insertion state of the power transmission mechanism of a power transmission roller same as the above The longitudinal section which shows the stage in the middle of switching the power transmission mechanism of a power transmission roller same as the above from an ON state to a OFF state The longitudinal section of the principal part showing the middle stage of switching the power transmission mechanism of the power transmission roller from the on state to the off state The longitudinal cross-sectional view which shows the cutting state of the power transmission mechanism of a power transmission roller same as the above Plan view showing the arrangement of each roller

Embodiments of the power transmission roller 1 according to the present invention are shown in FIGS. 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). For transmitting the rotational force to the driven roller S side by frictional force, the roller main body 2, the swing shaft 3, the swing arm 4, the bearing 5, the housing 6, the pair of

housing urging members

7, 7, The main component is a resistor 8 that generates a frictional force with the shaft 7a of the housing urging member 7, a sleeve 9, a sleeve urging member 10 that urges the sleeve 9, and a cam member 11. 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 directly contacts the driving roller D and the driven roller S as shown in FIG. 2 (see FIG. 2). A plurality of holes 2a 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 2b is formed at the rotation center of the roller body 2, and the bearing holding member 12 is inserted into the inner diameter of the inner ring 5a of the bearing 5 (in this embodiment, a ball bearing is used) and the bearing hole 2b. The roller main body 2 provided on the inner ring 5a side and the outer ring 5b of the bearing 5 are rotatable relative to each other. In this way, by configuring the roller body 2 to rotate together with the inner ring 5a, the load on the bearing 5 is reduced as compared with the case where the outer ring is a rotating ring, and the service life can be extended.

The housing 6 is fitted into the outer ring 5b of the bearing 5. As shown in FIG. 1, a pair of through

holes

6 a and 6 a are formed in the housing 6 at symmetrical positions around the bearing 5. The shaft 7a of the housing urging member 7 is inserted into each through hole 6a, and the head side (the lower end side of the shaft 7a in FIG. 1) is swingably provided by the swing shaft 3. It is fixed to the moving arm 4. A bolt is employed as the swing shaft 3 (see FIG. 2). The distal end side of the shaft 7a (in FIG. 1, the upper end side of the shaft 7a) is freely protruded from the housing 6 while being prevented from being detached by the retaining ring 7b.

A coil spring (hereinafter denoted by the same reference numeral 7c as the elastic body) is provided as the elastic body 7c coaxially with the shaft 7a, and biases the resistor 8 toward the housing 6 via the pressure receiving plate 7d. To do. The pair of

coil springs

7c and 7c correspond to the respective contact forces of the driving roller D and the driven roller S when at least one of the driving roller D or the driven roller S contacts the upper half of the roller body 2 shown in FIG. Each expands and contracts independently. Further, the swing arm 4 swings around the swing shaft 3 so that the roller body 2 is in contact with both the drive roller D and the driven roller S evenly.

By configuring the housing urging member 7 as a pair, the housing urging member 7 is hardly twisted during urging, and the power transmission roller 1 is reliably brought into contact with the driving roller D and the driven roller S. Is possible. For this reason, power transmission by friction between the driving roller D and the driven roller S can be stably performed. In addition, the bearing 5 can be provided between the pair of

housing urging members

7, 7, and the stability of the bearing 5 during rotation can be ensured.

The shaft 7 a is provided with a coil spring 7 c and a resistor 8 interposed in the housing 6. An inclined surface 8a inclined with respect to the axial direction of the shaft 7a is formed on the surface side of the resistor 8 that contacts the housing 6. On the other hand, on the surface side of the housing 6 that contacts the resistor 8, there is an inclined surface 6 b that has the same inclination angle as the inclined surface 8 a formed on the resistor 8 and that contacts the inclined surface 8 a. Is formed. The inclined surface 8a formed on the resistor 8 is formed so as to be reduced in diameter as it is separated from the coil spring 7c in the shaft axial direction.

When a flexible material such as a rubber material is used for the resistor 8, the resistor 8 is deformed even if it has a shape that is not continuous in the circumferential direction as in this embodiment. The inner peripheral surface of the body 8 can be brought into strong contact and a frictional force can be generated between them. On the other hand, when using a material such as a resin material or a metal material that is not easily deformed even when subjected to a biasing force from the coil spring 7 c or a reaction force from the housing 6, a part of the resistor 8 in the circumferential direction is used. It is preferable that a notch is formed in the cross section to form a C-shaped cross section, or that the resistor 8 is divided into a plurality of resistors in the circumferential direction. In this way, by forming a notch portion or by using a split resistor, even if a biasing force from the coil spring 7c or a reaction force from the housing 6 is received, such as a resin material or a metal material, deformation occurs. Even if it is a material which does not easily occur, the frictional force between the shaft 7a and the resistor 8 can be easily generated.

A gap is formed between the pair of through

holes

6a and 6a of the housing 6 and the

shafts

7a and 7a inserted into the through

holes

6a and 6a. The sleeve 9 moves in the axial direction in the gap. It is inserted freely. The distal end side of the sleeve 9 (in FIG. 1, the lower end side of the sleeve 9) is disposed so as to face the end surface of the resistor 8 on the reduced diameter side. The pair of

sleeves

9 and 9 are connected by a sleeve connecting member 13, and the sleeve 9 (sleeve connecting member 13) is interposed between the housing 6 and the sleeve 9 (sleeve connecting member 13). Thus, the sleeve 9 is biased in a direction away from the resistor 8.

At this time, the distal end portion of the sleeve 9 is slightly in contact with the end face of the resistor 8 or slightly touching the resistor 8 downward (to the extent that the damper function of the resistor 8 is not impaired). It has become. Further, a slight gap g is formed between the housing 6 and the surface of the sleeve connecting member 13 facing each other.

A through hole extending in the same direction as the shaft 7 a is formed in the sleeve connecting member 13, and a movement limiting member 14 formed in the housing 6 is inserted into the through hole. The movement restricting member 14 has an enlarged diameter portion at its head, and the sleeve 9 (sleeve connecting member 13) can move in the axial direction of the shaft 7a within the range of the length direction of the movement restricting member 14. it can. In this way, by limiting the movable range of the sleeve 9, the sleeve 9 can be moved when the power transmission mechanism is turned on (the power transmission roller 1, the driving roller D and the driven roller S are in contact). The resistor 8 is inadvertently urged against the urging force of the coil spring 7c to prevent the damper function from being lowered, and the power transmission mechanism is switched from the on state to the off state (with the power transmission roller 1 and When switching to the state in which the driving roller D and the driven roller S are separated from each other, the sleeve 9 is largely separated from the resistor 8, whereby the pressing of the resistor 8 by the sleeve 9 can be prevented from being delayed.

The rotating shaft 11a of the cam member 11 is provided on the cover (not shown) side that covers the driving roller D and the driven roller S. When the cam member 11 rotates about the rotation shaft 11a, the cam member 11 contacts the sleeve connecting member 13 and is disposed at a position where the sleeve connecting member 13 (sleeve 9) can be pressed.

In this embodiment, the bearing 5 and the housing urging member 7 are disposed in a plane that passes through the center in the width direction of the outer diameter surface of the roller body 2 (the surface that contacts the driving roller D and the driven roller S). With this arrangement, when the bearing 5 is urged by the housing urging member 7, a moment due to the urging force is prevented and the roller body 2 is prevented from being inclined due to this moment. be able to. 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 bearing 5, and the housing urging member 7 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 arranged at a predetermined position between the driving roller D and the driven roller S by fixing the swing shaft 3 to the cover via the spacer 15 and fitting the cover into the predetermined position. It has come to be. At this time, the power transmission roller 1 is provided with a mechanism (not shown) that can freely hold and release the housing urging member 7 in a contracted state, so that the power transmission roller 1 and the drive can be driven when the cover is fitted. By preventing the roller D and the driven roller S from coming into contact with each other, the power transmission roller 1 can be attached easily and smoothly.

In the above, the configuration in which the power transmission roller 1 is provided on the cover side has been described. However, if the installation 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 driving roller D or the driven roller S comes into contact with the roller body 2 of the power transmission roller 1, the contact force of the coil springs 7c, 7c of the pair of

housing urging members

7, 7 is increased. Each of them swings independently, and the swing arm 4 swings around the swing shaft 3. By this swinging, the respective contact forces between the driving roller D and the power transmission roller 1 and between the driven roller S and the power transmission roller 1 become substantially equal, and in this state, the driving roller D changes to the driven roller S. Power can be transmitted stably.

The damper function of the resistor 8 provided on the power transmission roller 1 will be described with reference to FIGS. 3A and 3B. When the roller body 2 (housing 6) moves toward the driving roller D and the driven roller S (that is, when the housing 6 moves so as to protrude from the swing arm 4), the biasing force F from the coil spring 7c is Since the force W acting on the resistor 8 is in the same direction (see FIG. 3B), the pressing force in the shaft axis direction acting on the resistor 8 is small and its deformation is small (see arrow P in FIG. 3B). Frictional force hardly acts between the resistor 8 and the shaft 7a. Therefore, the roller body 2 can be rapidly protruded and brought into contact with the driving roller D and the driven roller S.

On the other hand, the driving roller D and the driven roller S and the roller body 2 are in contact with each other, and a force is applied to the roller body 2 (housing 6) in a direction in which the roller body 2 is separated from the driving roller D and the driven roller S. Is moved (that is, when the housing 6 is moved so as to be pushed into the swing arm 4 side), the urging force F from the coil spring 7c and the reaction force generated from the housing 6 in a direction opposite to the urging force F are generated. W acts on the resistor 8, and a pressing force in the shaft axial direction acts on the resistor 8. This pressing force greatly deforms the resistor 8 (see arrow P in FIG. 3A), and the frictional force between the resistor 8 and the shaft 7a increases. Therefore, when a force that causes the roller body 2 to move away from the driving roller D and the driven roller S is applied, a function as a damper that delays the movement of the roller 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.

The function of the sleeve 9 provided on the power transmission roller 1 will be described with reference to FIGS.

When the power transmission mechanism of the power transmission roller 1 is in the on state (the state where the power transmission roller 1, the driving roller D, and the driven roller S are in contact with each other (see FIG. 1)), as shown in FIG. Does not come into contact with the sleeve connecting member 13 and the urging force of the sleeve urging member 10 causes the tip of the sleeve 9 to be separated from the end face of the resistor 8 or not press the resistor 8 downward (resistance) The damper function by the body 8 is in slight contact with the damper function). At this time, a slight gap g is formed between the housing 6 and the surface of the sleeve connecting member 13 facing each other.

Here, when the cam member 11 is rotated around the rotation shaft 11 a, the cam member 11 comes into contact with the sleeve coupling member 13 and presses the sleeve contact member 13 against the urging force of the sleeve urging member 10. (In FIG. 4, the pressing direction is downward). 5A, the sleeve connecting member 13 and the pair of

sleeves

9 and 9 are displaced in the pressing direction until the gap g (see FIG. 4) between the housing 6 and the sleeve connecting member 13 disappears (see FIG. 5A). (See the white arrow in FIG. 5A). At this time, the tip of the sleeve 9 presses the resistor 8 in the displacement direction against the urging force of the coil spring 7c. Then, as shown in the enlarged view of the main part in FIG. 5B, the inclined surface 6b of the housing 6 and the inclined surface 8a of the resistor 8 are separated from each other, and the frictional force between the

inclined surfaces

6b and 8a does not act.

Thus, by eliminating the frictional force between the

inclined surfaces

6b and 8a, the friction between the shaft 7a and the resistor 8 when the cam member 11 is rotated is also reduced. For this reason, as shown in FIG. 6, as the cam member 11 rotates, the housing 6 is pressed by the cam member 11 together with the sleeve connecting member 13 so that the roller body 2 is separated from the driving roller D and the driven roller S ( It can be displaced to (see the white arrow in FIG. 6). By this displacement, the power transmission mechanism can be switched from the on state to the off state (the state where the power transmission roller 1, the driving roller D, and the driven roller S are separated).

Incidentally, by rotating the cam member 11 in the direction opposite to the rotation direction shown in FIGS. 4 to 6, the sleeve 9 is separated from the end face of the resistor 8 by the urging force of the sleeve urging member 10, or resistance is increased. Retreat to the extent that the body 8 is not pressed downward. Thereby, the inclined surface 6b of the housing 6 and the inclined surface 8a of the resistor 8 are brought into contact with each other by the biasing force of the coil spring 7c, and the power transmission mechanism can be switched from the cut state to the on state.

The power transmission roller 1 according to the above embodiment is merely an example, and the power transmission mechanism is reduced in size, and power transmission by friction between the driving roller D and the driven roller S is stably performed. As long as the problem of the present invention that the power transmission between the roller D and the driven roller S is smoothly turned on and off can be solved, the shape and arrangement of each component part can be changed, or a separate part can be added. It is also permissible. For example, instead of pressing the sleeve connecting member 13 that connects the sleeves 9 with the cam member 11, the cam member 11 is provided on each of the pair of

sleeves

9 and 9 that can be moved independently, and the

sleeves

9 and 9 are independent. It is also possible to adopt a configuration in which the shape of the inclined surface 8a of the resistor 8 and the shape of the inclined surface 6b of the housing 6 are different shapes.

DESCRIPTION OF SYMBOLS 1 Power transmission roller 2 Roller main body 2a Hole 2b Bearing hole 3 Swing shaft 4 Swing arm 5 Bearing 5a Inner ring 5b Outer ring 6 Housing 7 Housing biasing member 7a Shaft 7b Retaining ring 7c Elastic body (coil spring)
7d Pressure receiving plate 8 Resistor 8a Inclined surface 9 Sleeve 10 Sleeve urging member 11 Cam member 11a Rotating shaft 12 Bearing holding member 13 Sleeve connecting member 14 Movement restricting member 15 Spacer D Drive roller S Driven roller g Gap

Claims

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) contacting and separating from the driving roller (D) and the driven roller (S);
A housing (6) provided on the inner diameter side of the roller body (2);
A bearing (5) provided at the center of rotation of the roller body (2) and configured to allow relative rotation between the roller body (2) and the housing (6);
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 shaft (7a) passing through the housing (6) and the swing arm (4), and the housing (6) are provided coaxially with the shaft (7a) and separated from the swing arm (4). And an elastic body (7c) for urging the housing (6), and the roller body (2) is placed at a predetermined position between the drive roller (D) and the driven roller (S). A pair of housing urging members (7, 7) for urging so that the contact force with the rollers (D, S) is balanced;
The urging force of the elastic body (7c) inserted through the shaft (7a) and the urging force acting on the shaft (7a) in an opposite direction to the axial direction of the shaft (7a). A resistor (8) that presses the shaft (7a) in its axial direction by a pinching force between
A sleeve (9) for pressing the resistor against the urging force of the elastic body;
A first inclined surface (8a) with respect to the axial direction of the shaft (7a) is formed on the surface of the resistor (8) that contacts the housing (6), and the resistance of the housing (6) A second inclined surface (6b) that abuts on the first inclined surface (8a) is formed on the surface facing the body (8), and the pressing of the resistor (8) by the sleeve (9) A power transmission roller configured to release contact between one inclined surface (8a) and the second inclined surface (6b).
The power transmission roller according to claim 1, wherein a movement limiting member (14) for limiting a moving range of the sleeve (9) to a predetermined range is formed in the housing (6).
The power transmission roller according to claim 1 or 2, further comprising a sleeve urging member (10) for urging the sleeve (9) in a direction away from the resistor (8).