JP2016128699A - Power transmission roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably transmit power by friction between a driving roller D and a driven roller S, and to make a power transmission mechanism therefor compact.SOLUTION: There is constituted a power transmission roller that comprises a bearing 2 which has an outer ring 2a and an inner ring 2b made relatively rotatable with rolling elements 2d interposed between the inner and outer rings 2a, 2b, a retaining member 3 provided on an inner diameter side of the inner ring 2b with a gap left with the inner diameter side, a first energizing member 4 interposed between the inner diameter side of the inner ring 2b and the retaining member 3, and a second energizing member 5 interposed between the inner diameter side of the inner ring 2b and the retaining member 3 and differing in energizing force from the first energizing member 4, and displaces the retaining member 3 with respect to the bearing 2 against energizing force of the first energizing member 4 and second energizing member 5 with external force operating on the side of the outer ring 2a as the driving roller D and driven roller S abuts on each other.SELECTED DRAWING: Figure 1

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.

  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 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. 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.

  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, in the present invention, in 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 side by a frictional force, A bearing in which the inner and outer rings are relatively rotatable via a rolling element between the inner ring, a support member provided on the inner diameter side of the inner ring with a gap between the inner ring side, and an inner diameter of the inner ring And a first biasing member provided between the support member and the inner diameter side of the inner ring and the support member, and the biasing direction is different from that of the first biasing member. A biasing force of the first biasing member and the second biasing member by an external force acting on the outer ring side in contact with the driving roller and the driven roller. Accordingly, the support member is displaced relative to the bearing. To constitute a power transmission roller, wherein Rukoto.

  According to this configuration, the power transmission roller contacts the driving roller and the driven roller, and the first biasing member and the second biasing member expand and contract independently by the contact force, and the inner diameter of the inner ring of the bearing with respect to the bearing The support member can be displaced within the range of the gap between the sides. Due to this displacement, the respective contact forces between the driving roller and the power transmission roller and between the driven roller and the power transmission roller become substantially equal. Therefore, power can be stably transmitted from the driving roller to the driven roller in this state. In addition, since the urging directions of the first urging member and the second urging member are different, the abutment force is freely displaced in an equal direction regardless of the direction around the power transmission roller. It becomes possible to make it.

  In addition, since the supporting member and the first urging member and the second urging member interposed between the inner diameter side of the inner ring and the supporting member are arranged on the inner diameter side of the inner ring of the bearing, the power transmission roller can be reduced in size. Can be achieved. Furthermore, since the first urging member and the second urging member are configured as a pair, twisting of the urging members at the time of urging is unlikely to occur, and the power transmission roller is surely connected to the driving roller and the driven roller. It is possible to abut. For this reason, power transmission by friction between the driving roller and the driven roller can be stably performed.

  In the above configuration, the outer ring may be integrally provided with a pulley that contacts the driving roller and the driven roller.

  By providing the pulley on the outer ring in this way, the outer diameter of the bearing can be reduced and the weight can be reduced. It can also be used at high rotations.

  In each said structure, said 1st biasing member and said 2nd biasing member each have a shaft and the spring member provided coaxially with this shaft, The edge part by the side of the said inner ring of each said shaft Is the fixed end to the inner ring side, while the other end of each shaft is inserted into the support member, and its insertion depth and insertion position can be changed within a predetermined range. Preferably, each of the spring members is configured to urge the support member in a direction from the fixed end side to the free end side of each shaft.

  By providing the shaft in this way, when an external force is applied to the outer ring side of the bearing, it is possible to prevent the biasing member from buckling due to the external force and the support member from being displaced in the axial direction of the bearing. For this reason, the power transmission roller, the driving roller, and the driven roller can be reliably brought into contact with each other, and the rotation of the driving roller can be transmitted to the driven roller without loss.

  In the configuration in which each of the first urging member and the second urging member includes a shaft and a spring member provided coaxially with the shaft, the first urging member and the second urging member are provided on the support member. It is preferable that an abutting surface with the urging direction of the urging member as a normal line is formed and the spring member abuts on the abutting surface.

  As described above, the free end of the shaft can change the insertion depth and the insertion position within a predetermined range with respect to the support member, but when the insertion position changes, it is provided coaxially with the shaft. The formed spring member slides with respect to the support member. Therefore, by forming a contact surface with the urging direction as a normal line on the support member, the spring member can slide smoothly along the contact surface, and the support member is quickly displaced. The

  Further, in the configuration in which each of the first urging member and the second urging member includes a shaft and a spring member provided coaxially with the shaft, a collar member is integrally provided on the inner diameter side of the inner ring. It is preferable that the fixed end of the shaft is inserted into the collar member.

  By providing the collar member in this way, it is not necessary to form an insertion hole for inserting the fixed end of the shaft into the inner ring of the bearing, so that the work complexity can be reduced and the insertion hole is formed in the inner ring. It is possible to prevent a decrease in the strength of the inner ring due to this.

  In each of the above configurations, the urging directions of the first urging member and the second urging member are respectively along the direction connecting the support member and the central portion of the driving roller or the driven roller. It is preferable that both biasing members are arranged.

  By arranging both the urging members in this way, the contact force acting on the outer ring side from the drive roller and the driven roller is easily transmitted directly to the support member, and the displacement of the support member with respect to the bearing is made smooth.

  In the present invention, a bearing in which the inner and outer rings are relatively rotatable via a rolling element between the outer ring and the inner ring, and a support provided on the inner diameter side of the inner ring with a gap between the inner ring side and the inner ring side. A first urging member provided between a member, an inner diameter side of the inner ring and the support member, and a first urging member interposed between the inner diameter side of the inner ring and the support member. The power transmission roller provided with the member and the 2nd biasing member from which a biasing direction differs was comprised.

  Thus, by configuring, the external force acting on the outer ring side with the contact with the driving roller and the driven roller resists the urging force of the first urging member and the second urging member, The support member can be displaced with respect to the bearing. By this displacement, the contact force between the power transmission roller, the driving roller and the driven roller can be made substantially equal, and the power transmission roller can be positioned easily and smoothly.

  Further, since the support member, the first urging member, and the second urging member are disposed on the inner diameter side of the inner ring of the bearing, the power transmission roller can be reduced in size. Further, since the first urging member and the second urging member are configured as a pair, the urging member is less likely to be twisted during urging, and the power transmission roller is reliably applied to the driving roller and the driven roller. It is possible to contact. For this reason, power transmission by friction between the driving roller and the driven roller can be stably performed.

1 shows a first embodiment of a power transmission roller according to the present invention, where (a) is a front view, and (b) is a cross-sectional view taken along line bb in (a). 1 is a longitudinal sectional view of the power transmission roller shown in FIG. 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. FIG. 1 is a longitudinal sectional view showing a manner in which the power transmission roller shown in FIG. 1 is a longitudinal sectional view showing the operation of the power transmission roller shown in FIG. The longitudinal cross-sectional view which shows the principal part of the power transmission roller shown in FIG. The front view which shows 2nd embodiment of the power transmission roller which concerns on this invention Front view showing a third embodiment of the power transmission roller according to the present invention and its operation Front view showing an example of the arrangement of each roller

  1 to 7 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 bearing 2, the support member 3, the first urging member 4, and the second urging member 5 are the main components (FIG. 1). (See (a) etc.). 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 bearing 2 includes an outer ring 2a and an inner ring 2b, and a plurality of rolling elements 2d held by a cage 2c are provided between the outer ring 2a and the inner ring 2b. Thereby, the outer ring 2a and the inner ring 2b can be relatively rotated around the axis. A pulley 6 that contacts the driving roller D and the driven roller S is integrally provided on the outer diameter side of the outer ring 2 a, and the outer ring 2 a rotates together with the pulley 6. The pulley 6 has a U-shaped circumferential cross section, and a hollow portion 6a is formed inside (see FIG. 1B). By forming the hollow portion 6a in this way, the pulley 6 can be reduced in weight and the rotation loss can be reduced. However, the inside may be in a solid state.

  As the pulley 6, in addition to a metal press-molded one, a resin molded into a predetermined shape can be used as long as it has a strength required for rotation transmission. Further, the outer diameter surface of the pulley 6 that contacts the driving roller D and the driven roller S is knurled to increase the friction between the power transmission roller 1 and the driving roller D and the driven roller S, thereby generating rotation loss. It can be reduced as much as possible.

  The support member 3 is a trapezoidal member that is provided on the inner diameter side of the inner ring 2b with a gap between the support member 3 and the inner diameter side. The support member 3 is formed with two through holes 3a and 3a penetrating the front and back surfaces. Long holes 3b and 3b are formed in the end surfaces of the non-parallel two sides of the support member 3, and the bottoms of the long holes 3b and 3b are connected to each other inside the support member 3 (see FIG. 2). . Note that the shape of the support member 3 is not limited to a trapezoidal shape, and may be other shapes such as a triangular shape.

  The first urging member 4 and the second urging member 5 are both provided between the inner diameter side of the inner ring 2 b and the support member 3. Each of the urging members 4 and 5 includes shafts 4a and 5a and spring members 4b and 5b provided coaxially with the shafts 4a and 5a. The first urging member 4 and the second urging member 5 are different from each other in the urging direction, that is, the directions of the shafts 4a and 5a (see FIG. 2 and the like). In this embodiment, the two urging members 4 and 5 are used. However, it is allowed to increase the number of urging members.

  An insertion hole 2e is formed on the inner surface side of the inner ring 2b, and one end sides of the shafts 4a and 5a are inserted into the insertion hole 2e. The shafts 4a and 5a inserted into the insertion holes 2e are in a state where they cannot be inserted and removed. Hereinafter, the end portions of the shafts 4a and 5a inserted into the insertion holes 2e are referred to as fixed ends. One end side (fixed end side) of the spring members 4b and 5b provided coaxially with the shafts 4a and 5a is in contact with the inner diameter side of the inner ring 2b (see FIG. 2).

  On the other hand, the ends of the shafts 4 a and 5 a opposite to the fixed ends are inserted into the long holes 3 b formed in the support member 3. The width of the long hole 3b is larger than the outer diameter of the shafts 4a and 5a and smaller than the spring diameter of the spring members 4b and 5b. Therefore, the end portions of the shafts 4a and 5a can be freely changed within a predetermined range (within the formation range of the long hole 3b) within the long hole 3b. Hereinafter, the end portions of the shafts 4a and 5a inserted into the elongated holes 3b are referred to as free ends.

  Further, the other end side (free end side) opposite to the fixed end side of the spring members 4b and 5b provided coaxially with the shafts 4a and 5a is in contact with the end faces of the two non-parallel sides. Hereinafter, the end surface of the support member 3 with which the other ends of the spring members 4b and 5b abut is referred to as an abutment surface 3c. The spring members 4b and 5b urge the support member 3 in a direction from the fixed end side to the free end side of the shafts 4a and 5a (see FIG. 2).

  The power transmission roller 1 is provided with washers 7 and 7 on both sides in the rotation axis direction of the inner ring 2b and the support member 3 of the bearing 2, and a fixing member 9 such as a bolt via a spacer 8 on the vehicle body B side. (See FIG. 5). A slight gap is provided between the washer 7 and the inner ring 2b, and the first urging member is prevented while the washer 7 prevents the inner ring 2b (bearing 2) from being displaced in the rotation axis direction of the bearing 2. 4 and the urging force of the second urging member 5 allow the bearing 2 to guide the support member 3 in a direction perpendicular to the rotation axis. In order to perform this guidance smoothly, it is necessary to make the outer diameter of the washer 7 larger than the inner diameter of the inner ring 2b. Further, it is preferable that the outer diameter of the washer 7 is made smaller than the inner diameter of the outer ring 2a so that the washer 7 does not inadvertently contact the outer ring 2a and the pulley 6 and hinder the rotation of the outer ring 2a and the like. The washer 7 is not an essential member, and can be omitted as appropriate. Moreover, in this embodiment, it was set as the aspect fixed to the main body B side with the two fixing members 9 and 9, However, As long as the fixing strength to the main body B of the power transmission roller 1 can be ensured, one fixing member 9 may be fixed.

  When an external force acts on the outer ring 2 a side of the bearing 2 in contact with the driving roller D and the driven roller S, the external force resists the urging force of the first urging member 4 and the second urging member 5. Thus, the support member 3 is displaced with respect to the bearing 2. 6 and 7 show a state in which the bearing 2 is slightly displaced downward from the position (the position indicated by an imaginary line (two-dot chain line) in each figure) before the external force is applied to the support member 3 (each The position shown by the solid line in the figure).

  At this time, the spring member 4b of the first biasing member 4 is in a contracted state as compared with the case where no external force is acting, while the spring member 5b of the second biasing member 5 is subjected to an external force. It is in an extended state compared to the case where it is not. By this displacement, the contact force between the power transmission roller 1 and the driving roller D and the driven roller S can be made uniform, and the transmission of rotation from the driving roller D to the driven roller S can be performed without causing a rotation loss. It can be done smoothly.

  The normal line of the abutting surface 3c with which the ends of the spring members 4b and 5b (the free ends of the shafts 4a and 5a) abut matches the urging direction of the first urging member 4 and the second urging member 5. ing. That is, the spring members 4b and 5b are configured to abut on the abutment surface 3c perpendicularly (see FIG. 7 and the like). In this way, by bringing the spring members 4b and 5b into contact with the contact surface 3c vertically, the spring members 4b and 5b can smoothly slide along the contact surface 3c, and the support member 3 is quickly made. In addition, since the first urging member 4 and the second urging member 5 are configured so that the urging directions thereof are different, the abutting force is equalized regardless of the external force acting around the power transmission roller 1. The supporting member 3 can be freely displaced in the direction

  The biasing direction of the first biasing member 4 is a direction connecting the support member 3 and the central portion of the driving roller D, and the biasing direction of the second biasing member 5 is the support member 3. And the center of the driven roller S are arranged (see FIG. 7 and the like). By arranging the urging members 4 and 5 in this way, the contact force acting on the outer ring 2a side from the driving roller D and the driven roller S is easily transmitted directly to the support member 3, and the displacement of the support member 3 with respect to the bearing 2 is reduced. Made smooth.

  In this embodiment, the support member 3, the first urging member 4, and the second urging member 5 are provided on the inner diameter side of the inner ring 2 b of the bearing 2. For this reason, size reduction of the power transmission mechanism including this power transmission roller 1 can be achieved.

  FIG. 8 shows a second embodiment of the power transmission roller 1 according to the present invention. The power transmission roller 1 includes a bearing 2, a support member 3, a first biasing member 4, and a second biasing member 5 as main components, and the basic configuration is a power transmission roller according to the first embodiment. 1 and in common. On the other hand, the difference is that the collar member 10 is provided integrally with the inner ring 2b on the inner diameter side of the inner ring 2b of the bearing 2.

  The collar member 10 is formed with an insertion hole for inserting the fixed ends of the shafts 4a and 5a, and the fixed ends of the shafts 4a and 5a are inserted into the insertion holes. Thus, by providing the collar member 10, it is not necessary to form the insertion hole 2e for inserting the fixed ends of the shafts 4a and 5a into the inner ring 2b of the bearing 2, and the work complexity can be reduced. Further, it is possible to prevent the strength of the inner ring 2b from being reduced due to the insertion hole 2e being formed in the inner ring 2b.

  FIG. 9 shows a third embodiment of the power transmission roller 1 according to the present invention. The power transmission roller 1 includes a bearing 2, a support member 3, a first biasing member 4, and a second biasing member 5 as main components, and the basic configuration is a power transmission roller according to the first embodiment. 1 and in common. On the other hand, there is a difference in that the pulley 6 is not provided on the outer diameter side of the outer ring 2a and the outer ring 2a directly contacts the driving roller D and the driven roller S. Thus, by setting it as the structure which does not provide the pulley 6 in the outer ring | wheel 2a, a number of parts can be reduced and the suppression of manufacturing cost can be aimed at.

  The power transmission roller 1 according to each of the embodiments described above is merely an example, and 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 above-described problem of the present invention can be solved, it is allowed to change the shape and arrangement of each component part or add a separate part.

DESCRIPTION OF SYMBOLS 1 Power transmission roller 2 Bearing 2a Outer ring 2b Inner ring 2c Cage 2d Rolling body 2e Insertion hole 3 Support member 3a Through-hole 3b Long hole 3c Contact surface 4 First biasing member 4a Shaft 4b Spring member 5 Second biasing member 5a Shaft 5b Spring member 6 Pulley 6a Cavity 7 Washer 8 Spacer 9 Fixing member 10 Color member D Drive roller S Follower roller

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 bearing (2) in which the inner and outer rings (2a, 2b) are relatively rotatable via a rolling element (2d) between the outer ring (2a) and the inner ring (2b);
A support member (3) provided on the inner diameter side of the inner ring (2b) with a gap between the inner ring (2b) and the inner diameter side;
A first biasing member (4) provided between the inner diameter side of the inner ring (2b) and the support member (3);
A second urging member (5) interposed between the inner diameter side of the inner ring (2b) and the support member (3), and having a different urging direction from the first urging member (4);
And the first biasing member (4) and the second biasing force by an external force acting on the outer ring (2a) side in contact with the driving roller (D) and the driven roller (S). A power transmission roller for displacing the support member (3) with respect to the bearing (2) against the urging force of the member (5).   2. The power transmission roller according to claim 1, wherein a pulley (6) that abuts against the driving roller (D) and the driven roller (S) is integrally provided on the outer ring (2 a).   The first urging member (4) and the second urging member (5) are a shaft (4a, 5a) and a spring member (4b, 5b) provided coaxially with the shaft (4a, 5a), respectively. The end of each shaft (4a, 5a) on the inner ring (2b) side is a fixed end to the inner ring (2b) side, while the other side of each shaft (4a, 5a) Are inserted into the support member (3), and the insertion depth and insertion position thereof can be changed within a predetermined range. The spring members (4b, 5b) The power transmission roller according to claim 1 or 2, wherein the support member (3) is urged in a direction from the fixed end side to the free end side of each shaft (4a, 5a).   The support member (3) is formed with a contact surface (3c) whose normal is the urging direction of the first urging member (4) and the second urging member (5). The power transmission roller according to claim 3, wherein the spring member (4b, 5b) abuts on 3c).   The collar member (10) is integrally provided on the inner diameter side of the inner ring (2b), and the fixed end of the shaft (4a, 5a) is inserted into the collar member (10). 4. The power transmission roller according to 4.   The urging directions of the first urging member (4) and the second urging member (5) are the support member (3) and the central portion of the driving roller (D) or the driven roller (S). The power transmission roller according to any one of claims 1 to 5, wherein the two urging members (4, 5) are arranged so as to be along the connecting direction.

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