JP6352128B2 - Power transmission roller - Google Patents

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, as shown in FIG. 1 of Patent Document 1, power transmission is performed between a driving roller (crankshaft pulley 4) and a driven roller (friction pulley 14) instead of using an auxiliary machine belt. A technique 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.

  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 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.

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

  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 that contacts the roller and the driven roller, a fulcrum shaft fixed to the cover side, a roller bearing that rotatably supports the roller body, and the fulcrum shaft and the roller bearing are attached to the fulcrum shaft. And a swinging arm housed on the inner diameter side of the roller body for rotating the roller bearing about the fulcrum shaft, A swing urging member housed on the inner diameter side of the roller body for urging the arm to rotate about the fulcrum shaft. It was constructed La.

  According to this configuration, when the swinging arm is biased by the swinging biasing member, the swinging arm swings around the fulcrum shaft, and the roller bearing and the power transmission roller (roller main body) also swing. Then, the power transmission roller comes into contact with one of the driving roller and the driven roller and receives a reaction force accompanying this contact. Due to this reaction force, the fulcrum shaft moves relative to the radial direction of the roller bearing by the action of the displacement mechanism, and the power transmission roller contacts the other side of the driving roller or the driven roller that was not initially in contact with this relative movement. . The position of the fulcrum shaft is determined when both the contact force between the power transmission roller and the drive roller and the contact force between the power transmission roller and the driven roller are balanced.

  As described above, the position of the fulcrum shaft and the roller bearing can be moved relative to each other by the contact force between the power transmission roller, the driving roller, and the driven roller. The position of the power transmission roller is determined so that the contact force between the two becomes equal. For this reason, power can be stably transmitted from the driving roller to the driven roller via the power transmission roller. In addition, since the swing arm and swing biasing member are housed on the inner diameter side of the roller body, all components such as a fulcrum shaft and a roller bearing that swing the swing arm are disposed on the inner diameter side of the roller body. Therefore, the power transmission roller including the swing mechanism can be reduced in size.

  In the above configuration, the displacement mechanism may have a guide hole formed in the swing arm, and the fulcrum shaft may be movably provided in the guide hole. In this way, by forming the guide hole and guiding the fulcrum shaft movably through the guide hole, the power transmission roller, the driving roller, and the driven roller can be brought into contact smoothly and evenly. The shape (size, orientation, etc.) of the guide hole is not particularly limited as long as the roller bearing attached to the swing arm and the fulcrum shaft can be relatively contacted and separated by a necessary distance.

  In the configuration for forming the guide hole, it is preferable to further include a biasing member that is provided on the swing arm and biases the fulcrum shaft in one direction within the guide hole. By providing this urging member, it is possible to prevent the fulcrum shaft from rattling in the guide hole and to easily incorporate the power transmission roller into a predetermined position. Although the urging force by the urging member can be determined as appropriate, it may be sufficient to prevent rattling of the fulcrum shaft. This is because if the urging force is excessive, the contact force between the power transmission roller, the driving roller, and the driven roller is excessive, and power transmission loss is likely to occur.

  Instead of forming the guide hole in this way, the displacement mechanism has an eccentric shaft having the fulcrum shaft as an eccentric rotation center, and the eccentric shaft is rotatably held by the swing arm. You can also. By rotating the eccentric shaft eccentrically around the fulcrum shaft in this manner, the position of the fulcrum shaft and the roller bearing is relatively adjusted by the contact force between the power transmission roller, the drive roller and the driven roller, as in the case of forming the guide hole. The position of the power transmission roller is determined so that the contact force between the power transmission roller, the driving roller, and the driven roller becomes equal. For this reason, power can be stably transmitted from the driving roller to the driven roller by the power transmission roller.

  In each said structure, the said rocking | biasing biasing member can be set as the structure which is a hydraulic tensioner apparatus. In the roller body of the power transmission roller, the contact surface with the driving roller and the driven roller may wear with the passage of time, and the surface may be uneven. When the unevenness and the driving roller come into contact with each other, there is a problem that an abnormal noise due to rattling is generated or the life of the power transmission roller is shortened as the driving roller rotates. Therefore, by adopting the hydraulic tensioner device as the swinging urging member, the rattling due to the unevenness can be attenuated by the damping action of the hydraulic tensioner device, and the quietness during the operation of the power transmission roller can be ensured. At the same time, the service life can be extended.

  In each of the above-described configurations, an eccentric cam is provided in the vicinity of the roller bearing, and the eccentric cam rotates around an eccentric rotation shaft so as to contact the roller bearing or a member configured integrally with the roller bearing. It is preferable that the contact between the roller main body and at least one of the drive roller or the driven roller is released by contact. Thus, by adopting the eccentric cam, it is possible to easily switch contact or release between the power transmission roller, the drive roller and the driven roller.

  In the present invention, a roller body that contacts the driving roller and the driven roller, a fulcrum shaft fixed to the vehicle body side, a roller bearing that rotatably supports the roller body, and the fulcrum shaft and the roller bearing are attached. And a swing mechanism housed on the inner diameter side of the roller body that has a displacement mechanism that allows the fulcrum shaft to be relatively movable in the radial direction of the roller bearing, and rotates the roller bearing around the fulcrum shaft. A power transmission roller comprising: an arm; and a swinging biasing member housed on the inner diameter side of the roller body for biasing the swinging arm to rotate about the fulcrum shaft. Configured.

  As described above, the position of the fulcrum shaft and the roller bearing can be moved relative to each other by the contact force between the power transmission roller, the driving roller, and the driven roller. The position of the power transmission roller is determined so that the contact force between the two becomes equal. For this reason, power can be stably transmitted from the driving roller to the driven roller via the power transmission roller. In addition, since the swing arm and swing biasing member are housed on the inner diameter side of the roller body, all components such as a fulcrum shaft and a roller bearing that swing the swing arm are disposed on the inner diameter side of the roller body. Therefore, the power transmission roller including the swing mechanism can be reduced in size.

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). 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. It is a top view which shows the effect | action of the power transmission roller shown in FIG. 1, (a) is the state which the roller main body contact | abutted to one roller, (b) is the state which the roller main body contact | abutted to both rollers 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 It is a figure which shows 2nd 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). FIG. 7 is a plan view showing the operation of the power transmission roller shown in FIG. 6, where (a) shows a state in which the roller main body is in contact with one roller, and (b) shows a state in which the roller main body is in contact with both rollers.

  1 to 3 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, and the roller body 2, the fulcrum shaft 3, the swing arm 4, the roller bearing 5, and the swing biasing member 6 are the 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. A bearing hole 2 a is formed at the rotation center of the roller body 2. An outer ring 5a of a roller bearing 5 (ball bearing) is fitted in the bearing hole 2a. On the inner ring 5 b side of the roller bearing 5, the swing arm 4 is fixed by a bolt 7. The swing arm 4 is a rod-like member, and a roller bearing 5 is attached to the center thereof, a displacement mechanism 8 is provided on one end side, and a contact pin 9 is provided on the other end side. .

  In this configuration, the outer ring 5a of the roller bearing 5 in which the roller body 2 is fitted is rotated. However, while the roller body 2 is fitted on the inner ring 5b side, the swing arm 4 is provided on the outer ring 5a side. It can also be set as the structure to insert.

  The displacement mechanism 8 has a guide hole 8 a formed in the swing arm 4, and the guide member 8 b is inserted into the guide hole 8 a in the length direction of the swing arm 4 (the direction connecting the roller bearing 5 and the fulcrum shaft 3). The guide member 8b is provided with a fulcrum shaft 3. That is, the fulcrum shaft 3 is movable in the guide hole 8 a along the length direction of the swing arm 4. The fulcrum shaft 3 is attached to a cover C (see FIG. 1B) that covers each of the rollers such as the driving roller D. A spring as an urging member 8c is provided between the swing arm 4 and the guide member 8b. The urging member 8c acts to urge the swing arm 4 toward the roller bearing 5 with respect to the guide member 8b (fulcrum shaft 3).

  A swinging biasing member 6 is provided on the contact pin 9 side. The swing urging member 6 is attached to the cover C like the fulcrum shaft 3. In the first embodiment, an actuator (hereinafter referred to as the same as the swinging biasing member 6) is adopted as the swinging biasing member 6, and the pressing part 6b protruding from the main body part 6a of the actuator 6 is used. The swing arm 4 is swung around the fulcrum shaft 3 by pressing the contact pin 9. It is particularly preferable to employ a hydraulic tensioner as the actuator 6.

  In this way, instead of adopting the actuator 6, a pressing spring (not shown) is provided at a position where the actuator 6 is disposed, and the abutting pin 9 is pressed by this pressing spring, or the fulcrum shaft 3 is pressed. Similar to the actuator 6, a torsion coil spring (not shown) that urges the swing arm 4 around the fulcrum shaft 3 in the rotation direction (clockwise direction in FIG. 1A) is provided. Can be obtained.

  Further, instead of fixing the swinging biasing member 6 to the cover C side and the contact pin 9 to the swinging arm 4 side as described above, the contact pin 9 is fixed to the cover C while the swinging biasing member 6 is fixed. Even if the biasing member 6 is fixed to the swing arm 4 side, the swing arm 4 can be swung around the fulcrum shaft 3.

  In this configuration, the fulcrum shaft 3, the swing arm 4, the roller bearing 5, and the swing biasing member 6 are all disposed 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. Further, since the fulcrum shaft 3 and the swing urging member 6 are attached to the cover C that covers the driving roller D and the driven roller S, the roller body is fitted to the driving roller D and the driven roller by fitting the cover C into a predetermined position. The actuator 6 can be reliably and easily disposed at a predetermined position between the actuator S and the position where the contact pin 9 can be pressed.

  The operation of the power transmission roller 1 according to the first embodiment will be described with reference to FIG. When the pressing portion 6 b of the actuator 6 is protruded and the contact pin 9 provided on the swing arm 4 is pressed, the swing arm 4 swings around the fulcrum shaft 3 by this pressing force. Then, the drive roller D contacts the roller body 2 of the power transmission roller 1 (see FIG. 4A). Further, when the pressing portion 6b is protruded, the urging member 8c is compressed by the reaction force from the driving roller D accompanying this pressing, and accordingly, the fulcrum shaft 3 relatively moves in the guide hole 8a, The roller body 2 (roller bearing 5) is displaced toward the fulcrum shaft 3 side. Due to this displacement, the roller body 2 comes into contact with the driven roller S (see FIG. 4B), and power can be transmitted from the driving roller D to the driven roller S.

  In the vicinity of the roller bearing 5 of the power transmission roller 1, as shown in FIG. 5, an eccentric cam 10 that rotates around an eccentric shaft 10 a so as to be able to contact the roller bearing 5 is provided. The eccentric shaft 10a is connected to a motor (not shown) via a speed reduction mechanism 11 such as a planetary gear mechanism. In a state where the eccentric cam 10 is not in contact with the swing arm 4 (see FIG. 5A), the power transmission roller 1 is in contact with the drive roller D and the driven roller S, respectively, and the drive roller D to the driven roller S. Power is transmitted.

  On the other hand, the eccentric cam 10 abuts on the swing arm 4 and resists the biasing force of the swing biasing member 6 (actuator 6) provided on the power transmission roller 1 (so as to push the pressing portion 6b). When the swing arm 4 is swung, the power transmission roller 1 is separated from the drive roller D and the driven roller S (see FIG. 5B), and the power transmission from the drive roller D to the driven roller S is cut off. Is done.

  As described above, by providing the eccentric cam 10, 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 10 and the swing arm 4 or the roller bearing 5 is pushed by this actuator, the same action can be obtained. The pushing of the swing arm 4 or the roller bearing 5 by the eccentric cam 10 does not necessarily have to push the swing arm 4 or the roller bearing 5 directly. You may make it push in via a member (not shown).

  FIG. 6 shows a second embodiment of the power transmission roller 1 according to the present invention. The basic configuration of the power transmission roller 1 is the same as that of the power transmission roller 1 according to the first embodiment, but the configuration of the displacement mechanism 8 provided on the swing arm 4 is different. That is, the displacement mechanism 8 according to the second embodiment has an eccentric shaft 8e having the fulcrum shaft 3 as an eccentric rotation center, and a first bearing 8f is provided between the fulcrum shaft 3 and the eccentric shaft 8e. Both shafts 3 and 8e are rotatable relative to each other. The eccentric shaft 8e is held by the swing arm 4 via the second bearing 8g, and the eccentric shaft 8e and the swing arm 4 can also rotate relative to each other.

  The operation of the power transmission roller according to the second embodiment will be described with reference to FIG. When the pressing portion 6 b of the actuator 6 is protruded and the contact pin 9 provided on the swing arm 4 is pressed, the swing arm 4 swings around the fulcrum shaft 3 by this pressing force. Then, the driving roller D contacts the roller body 2 of the power transmission roller 1 (see FIG. 7A). Further, when the pressing portion 6b is projected, the eccentric shaft 8e rotates eccentrically around the fulcrum shaft 3 due to the reaction force from the driving roller D accompanying this pressing, and accordingly, the relative rotation of the fulcrum shaft 3 within the eccentric shaft 8e The position moves, and the roller body 2 (roller bearing 5) is displaced toward the fulcrum shaft 3 side. Due to this displacement, the roller body 2 comes into contact with the driven roller S (see FIG. 7B), and power can be transmitted from the driving roller D to the driven roller S.

  Also in the second embodiment, as in the first embodiment, an eccentric cam 10 is provided in the vicinity of the roller bearing 5 of the power transmission roller 1, and the eccentric cam 10 is brought into contact with the swing arm 4 around the eccentric shaft 8e. When the swinging arm 4 is swung so as to be able to rotate and resist the biasing force of the swinging biasing member 6 (actuator 6) provided on the power transmission roller 1 (to push the pressing portion 6b). The power transmission roller 1, the driving roller D, and the driven roller S are separated from each other, and the power transmission from the driving roller D to the driven roller S is interrupted (see FIG. 5B).

  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. Further, the configuration of the displacement mechanism 8 shown in each embodiment is merely an example, and the contact between the power transmission roller 1, the drive roller D and the driven roller S is between the fulcrum shaft 3 and the roller bearing 5. Any distance can be adopted as long as the distance can be made variable.

DESCRIPTION OF SYMBOLS 1 Power transmission roller 2 Roller main body 2a Bearing hole 3 Supporting shaft 4 Swing arm 5 Roller bearing 5a Outer ring 5b Inner ring 6 Swing biasing member 7 Bolt 8 Displacement mechanism 8a Guide hole 8b Guide member 8c Biasing member 8e Eccentric shaft 8f First Single bearing 8g Second bearing 9 Contact pin 10 Eccentric cam 10a Eccentric shaft 11 Reduction mechanism D Drive roller S Follower roller C Cover

Claims (6)

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) in contact with the drive roller (D) and the driven roller (S);
A fulcrum shaft (3) fixed to the cover (C) side;
A roller bearing (5) for rotatably supporting the roller body (2);
The fulcrum shaft (3) and the roller bearing (5) are attached, and a displacement mechanism (8) for making the fulcrum shaft (3) relatively movable in the radial direction of the roller bearing (5), A swing arm (4) housed on the inner diameter side of the roller body (2) for rotating the roller bearing (5) around a fulcrum shaft (3);
A swinging biasing member (6) housed on the inner diameter side of the roller body (2) for biasing the swinging arm (4) to rotate about the fulcrum shaft (3);
A power transmission roller comprising:   The displacement mechanism (8) has a guide hole (8a) formed in the swing arm (4), and the fulcrum shaft (3) is movably provided in the guide hole (8a). The power transmission roller according to claim 1.   The biasing member (8c) provided on the swing arm (4) and biasing the fulcrum shaft (3) in one direction in the guide hole (8a) is further provided. The power transmission roller described in 1.   The displacement mechanism (8) has an eccentric shaft (8e) having the fulcrum shaft (3) as an eccentric rotation center, and the eccentric shaft (8e) is rotatably held by the swing arm (4). The power transmission roller according to claim 1, wherein:   The power transmission roller according to any one of claims 1 to 4, wherein the swing urging member (6) is a hydraulic tensioner device.   An eccentric cam (10) is provided in the vicinity of the roller bearing (5), and the eccentric cam (10) is rotated around an eccentric rotation shaft to be integrated with the roller bearing (5) or the roller bearing (5). The contact between the roller main body (2) and at least one of the drive roller (D) or the driven roller (S) is released by contacting the member. The power transmission roller according to any one of 1 to 5.

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