JP2009030799A - Pulley structure and accessory driving system using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pulley structure with rubber elastic bodies having high durability, for preventing the slip and tension irregularity of a belt. <P>SOLUTION: The pulley structure 200 comprises a cylindrical first rotor 1 on which the belt 111 is wound, a cylindrical second rotor 2 provided inside the first rotor 1 rotatably relative to the first rotor 1, and the plurality of rubber elastic bodies 4 installed between the first rotor 1 and the second rotor 2 side by side in the peripheral direction of the rotors and extending in the radial direction of the rotors obliquely in the opposite direction to the rotating direction of the two rotors 1, 2. When the rotating speed of the first rotor 1 is higher than the rotating speed of the second rotor 2, the plurality of rubber elastic bodies 4 each receive compressive force. When the rotating speed of the first rotor 1 is lower than the rotating speed of the second rotor 2, the plurality of rubber elastic bodies 4 each receive tensile force. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pulley structure and an accessory drive system using the pulley structure.

  In an auxiliary machine drive system that drives an auxiliary machine such as an alternator by the power of an engine such as an automobile, a belt extends between a pulley connected to a drive shaft of the auxiliary machine such as an alternator and a pulley connected to an output shaft of the engine. The engine torque is transmitted to the auxiliary machine through the belt. In general, the rotational speed of the output shaft of the engine varies due to factors such as the explosion stroke of the engine, and the traveling speed of the belt also varies accordingly. Therefore, slip occurs between the belt and the pulley connected to the drive shaft of the auxiliary machine, or the tension of the belt greatly fluctuates. Such excessive belt slip and tension fluctuations may cause abnormal noise of the belt and shorten the life. In particular, since the alternator has a large moment of inertia of the power generation shaft, belt slip and tension fluctuation are particularly likely to occur. Furthermore, when the rotational fluctuation of the output shaft is transmitted to the power generation shaft, there is a problem that the durability of the alternator is lowered and the power generation efficiency is adversely affected.

  Therefore, conventionally, a pulley structure capable of absorbing the rotational fluctuation of the output shaft has been employed in such an accessory drive system. Such a pulley structure has a double structure, a first rotating body around which the belt is wound, and a second rotating body provided inside the first rotating body and relatively rotatable with respect to the first rotating body. And a rotating body. An annular rubber elastic body is provided between the two rotating bodies, and the two rotating bodies are connected via the rubber elastic body. When this pulley structure is connected to the drive shaft of the auxiliary machine, that is, when the second rotary body is connected to the drive shaft of the auxiliary machine, the rotation fluctuation of the output shaft is transmitted to the first rotary body via the belt. The When the two rotating bodies rotate relative to each other, the torque is transmitted between the two rotating bodies via the rubber elastic body and the rubber elastic body is twisted in the circumferential direction. , Rotational fluctuations are absorbed. Therefore, belt slip and tension fluctuation can be suppressed. However, when such a pulley structure is used for a long time, the rubber elastic body may be damaged by twisting. Accordingly, various pulley structures having a structure for suppressing excessive twisting of the rubber elastic body have been proposed.

  For example, the pulley structure disclosed in Patent Document 1 includes a deflection limiting portion for restricting relative rotation of two rotating bodies that is greater than or equal to a predetermined relative rotation angle. The deflection limiting portion is composed of a central plate fixed to the outer peripheral surface of the second rotating body and an elastic contact portion disposed on the inner peripheral surface of the first rotating ground body. The rubber elastic body is fixed to the two rotating bodies. When the relative rotation angle between the two rotating bodies reaches a predetermined value, the elastic contact portion comes into contact with the central plate, and further relative rotation of the two rotating bodies is restricted, and at the same time, further twisting of the rubber elastic body. Are also regulated.

  Further, the rubber elastic body of the pulley structure disclosed in Patent Document 2 is fixed to one of the two rotating bodies so as not to be relatively rotatable, and the other rotating body is interposed via a sliding layer. It is slidably connected. When torque of a predetermined value or more acts between the two rotating bodies, the sliding layer and the other rotating body slide and rotate, so that excessive twisting of the rubber elastic body is suppressed.

JP 2006-177548 A Japanese Patent Laid-Open No. 6-200956

  However, according to the pulley structure of Patent Documents 1 and 2 described above, even when the torsion angle of the rubber elastic body is suppressed, when transmitting torque between the two rotating bodies, the inner and outer peripheral portions of the rubber elastic body Shear stress always acts on the part. Therefore, the rubber elastic body is easily damaged.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a pulley structure having high durability of a rubber elastic body and an accessory driving system using the same, while preventing belt slip and tension fluctuation.

Means for Solving the Problems and Effects of the Invention

  The pulley structure according to claim 1 is a cylindrical first rotating body around which a belt is wound, and a cylindrical structure provided inside the first rotating body so as to be relatively rotatable with respect to the first rotating body. A second damper, and a first damper member made of a plurality of rubber elastic bodies arranged side by side in the circumferential direction of the rotor between the first rotor and the second rotor, When the first rotating body rotates relative to the second rotating body in a predetermined direction, the plurality of rubber elastic bodies receive a compression force, respectively, while the first rotating body becomes the second rotating body. On the other hand, the plurality of rubber elastic bodies are each configured to receive a tensile force when they are relatively rotated in a direction opposite to the predetermined direction.

  When the first rotating body and the second rotating body rotate relative to each other, torque is transmitted between these two rotating bodies via the rubber elastic body. At this time, the rubber elastic body is deformed at the same time to absorb the rotational fluctuation of the rotating body. Thereby, it is possible to prevent the belt wound around the first rotating body from slipping or the belt tension from fluctuating excessively. Here, in the case of a conventional pulley structure in which an annular rubber elastic body is installed between two rotating bodies, the rubber elastic body receives a shearing force in the circumferential direction when the two rotating bodies rotate relative to each other. On the other hand, the plurality of rubber elastic bodies of the pulley structure of the present invention receives a compressive force or a tensile force when the two rotating bodies rotate relative to each other. Therefore, the rubber elastic body of the present invention is less likely to be damaged than when subjected to a shearing force. Therefore, the durability of the rubber elastic body can be improved.

  According to a second aspect of the present invention, the pulley structure according to the first aspect is characterized in that the plurality of rubber elastic bodies extend while being inclined in the circumferential direction with respect to the radial direction of the rotating body.

  With the above configuration, the plurality of rubber elastic bodies can receive a compressive force when the first rotating body rotates relative to the second rotating body in a predetermined direction, while the first rotating body is the second rotating body. When it rotates relative to the rotating body in the direction opposite to the predetermined direction, it can receive a tensile force.

  A pulley structure according to a third aspect is the pulley structure according to the first or second aspect, further comprising a restriction member disposed on at least one side of the rubber elastic body in the axial direction of the rotating body, and the rubber elastic body receives the compression force. Thus, the rubber elastic body is further deformed by being expanded and deformed in contact with the restricting member, thereby restricting further deformation of the rubber elastic body.

  When the first rotating body rotates relative to the second rotating body in a predetermined direction, the plurality of rubber elastic bodies receive a compressive force and contract, and simultaneously expand in the axial direction to contact the regulating member. Thereby, since the further deformation | transformation of a rubber elastic body is controlled, durability of a rubber elastic body improves.

  A pulley structure according to a fourth aspect is the pulley structure according to the first aspect, wherein the pulley structure is adjacent to the first damper member between the first rotating body and the second rotating body in the axial direction of the rotating body, and the rotation A second damper member made of a plurality of rubber elastic bodies arranged side by side with respect to the axial direction of the body, and the plurality of the plurality of the plurality of rubber members when the first rotating body rotates relative to the second rotating body in a predetermined direction. When the plurality of rubber elastic bodies constituting the second damper member each receive a tensile force, the first rotating body rotates relative to the second rotating body in a direction opposite to the predetermined direction. The plurality of rubber elastic bodies constituting the plurality of second damper members are each configured to receive a compressive force.

  According to the above configuration, when the two rotating bodies rotate relative to each other and the rubber elastic body constituting one of the two damper members receives a tensile force, the rubber elastic body constituting the other damper member receives a compressive force. The deformation of the rotating body is absorbed by the deformation. For this reason, the tensile force received by the rubber elastic body is reduced as compared with the case where only one damper member is provided, so that the durability of the rubber elastic body is improved.

  A pulley structure according to a fifth aspect is the pulley structure according to the fourth aspect, wherein each of the plurality of rubber elastic bodies extends while being inclined in the circumferential direction with respect to a radial direction of the rotating body. The inclined directions of the plurality of rubber elastic bodies constituting the damper member and the plurality of rubber elastic bodies constituting the two damper members with respect to the radial direction are opposite to each other.

  With the above configuration, when the first rotating body rotates relative to the second rotating body, one of the first damper member and the second damper member can receive a compressive force, and the other can receive a tensile force.

  A pulley structure according to a sixth aspect of the present invention is the pulley structure according to the fourth or fifth aspect, wherein at least one side of the rubber elastic body constituting the first damper member and the second damper member are configured with respect to the axial direction of the rotating body. The rubber elastic body includes a restricting member disposed on at least one side of the rubber elastic body, and the rubber elastic body receives the compressive force, expands and deforms in the axial direction, and comes into contact with the restricting member. It is characterized by restricting further deformation of the body.

  When the first rotating body rotates relative to the second rotating body, the plurality of rubber elastic bodies constituting one of the first damper member and the second damper member receive the compressive force and simultaneously contract in the axial direction. It expands and contacts the regulating member. Thereby, since the further deformation | transformation of this rubber elastic body is controlled, durability improves. Further, since the deformation of the rubber elastic body that receives the compressive force is restricted by the restricting member, the relative rotation of the two rotating bodies is also restricted. Deformation can also be regulated. Accordingly, the durability of the rubber elastic body is further improved.

  A pulley structure according to a seventh aspect is the pulley structure according to any one of the first to sixth aspects, wherein the plurality of rubber elastic bodies are fixed to any one of the first rotary body and the second rotary body. And is slidable with respect to the other rotating body.

  With the above configuration, when the first rotating body rotates relative to the second rotating body and the plurality of rubber elastic bodies receive a tensile force, the plurality of rubber elastic bodies slide on the other rotating body. Can be made. For this reason, the tensile force acting on the rubber elastic body is smaller than when the rubber elastic body is fixed to both of the two rotating bodies, so that the rubber elastic body is hardly broken and durability is improved.

  The pulley structure according to claim 8 is characterized in that, in claim 7, the surface of the plurality of rubber elastic bodies on the side of the other rotating body is covered with a coating material having high wear resistance.

  With the above configuration, the rubber elastic body does not slide directly with respect to the other rotating body, but slides through the covering material, so that the rubber elastic body is prevented from being worn or damaged due to catching, Durability is improved.

  The pulley structure according to claim 9 is the pulley structure according to any one of claims 1 to 8, wherein the plurality of rubber elastic bodies are compressed between the first rotating body and the second rotating body in the radial direction. It is characterized by being installed.

  A rubber elastic body placed in a compressed state with respect to the radial direction is more likely to be compressed and deformed when subjected to a compressive force due to relative rotation of the two rotating bodies than when installed in an unloaded state. Therefore, since the rubber elastic body can reliably receive a large compressive force, torque can be reliably transmitted between the two rotating bodies.

  A pulley structure according to a tenth aspect is the pulley structure according to any one of the first to ninth aspects, made of a material having an elastic modulus lower than an elastic modulus of the rubber elastic body, and among the plurality of rubber elastic bodies, the circumferential direction. It is characterized by comprising a plurality of deformation absorbing members interposed in the gap between two adjacent rubber elastic bodies.

  When the two rotating bodies rotate relative to each other, the plurality of rubber elastic bodies are compressed by receiving a compressive force, and at the same time, try to expand in the circumferential direction. At this time, since the plurality of rubber elastic bodies are sandwiched between the two deformation absorbing members in the circumferential direction, the rubber elastic bodies are smoothly expanded and deformed in the circumferential direction while pressing the deformation absorbing members. As a result, the rubber elastic body is prevented from buckling because rapid deformation in the circumferential direction is suppressed, and durability is improved.

  An auxiliary machine drive system according to claim 11 is an auxiliary machine drive system for driving a plurality of auxiliary machines including an alternator, an output shaft connected to an engine, a first pulley provided on the output shaft, A plurality of accessory drive shafts respectively connected to the plurality of accessories, a plurality of second pulleys respectively provided on the plurality of accessory drive shafts, the first pulley, and the plurality of second pulleys A pulley structure according to any one of claims 1 to 10, wherein a second pulley provided on at least an auxiliary machine drive shaft of the alternator among the plurality of second pulleys includes a belt to be wound. It is characterized by that.

  With the above configuration, excessive slip and tension fluctuations of the belt suspended on the pulley structure according to any one of claims 1 to 10 can be prevented over a long period of time.

Embodiments of the present invention will be described below.
The auxiliary machine drive system 100 of this embodiment is a system that drives an alternator or the like, which is an auxiliary machine of an automobile engine, with the rotational force of the engine. The auxiliary machine drive system 100 includes an engine crankshaft 101, a pulley (first pulley) 102 coupled to the crankshaft, an alternator (Alt) drive shaft 103, and an air compressor (A / C) drive shaft 104. A drive shaft 105 of a power steering (P / S), a drive shaft 106 of a water pump (W / P), and pulleys (second second gears) connected to the drive shafts 103, 104, 105, 106 of these auxiliary machines, respectively. (Pulley) 107, 10, 108, 109, 110, a belt 111 wound around these pulleys 102, 107, 108, 109, 110, and a tension pulley of an auto tensioner that adjusts the tension of the belt 111 ( (A / T) 112 and an idler pulley that abuts on the belt 111 between the pulley 102 and the pulley 108 ( Consists of dler) 113 Metropolitan. The belt 111 is a V-ribbed belt having a plurality of rib portions extending in the belt longitudinal direction.

  The crankshaft 101 rotates with rotational fluctuations resulting from the engine explosion stroke. When the pulley 102 connected to the crankshaft 101 is rotationally driven, the belt 111 travels. As the belt 111 travels, the pulleys 107, 108, 109, and 110 are driven to rotate, thereby driving an auxiliary machine such as an alternator. Hereinafter, the pulley structure applied to the pulley 107 provided on the drive shaft 103 of the alternator will be described in detail.

<First Embodiment>
The pulley structure 200 according to the first embodiment of the present invention will be described.
As shown in FIG. 2, the pulley structure 200 of this embodiment includes a cylindrical first rotating body 1 around which a belt 111 is wound, and a first rotating body 1 relative to the first rotating body 1 inside the first rotating body 1. A damper member (first damper member) 3 comprising a cylindrical second rotating body 2 provided rotatably and a plurality of rubber elastic bodies 4 installed between the first rotating body 1 and the second rotating body 2. With.

  The first rotator 1 and the second rotator 2 rotate around the common rotation axis A in the direction of the arrow in FIG. In the following description of the pulley structure, the axial direction of the rotating shaft A is defined as the axial direction, and the circumferential direction and radial direction of the two rotating bodies 1 and 2 are simply defined as the circumferential direction and radial direction. 2 and 6 is defined as the left-right direction, and the rotation direction of the two rotating bodies 1 and 2 (the direction of the arrow in FIG. 3) is defined as the rotation direction.

  As shown in FIG. 2, a plurality of pulley grooves that engage with the rib portions of the belt 111 are formed on the outer peripheral surface of the first rotating body 1. Further, a drive shaft (not shown) of the alternator is screwed into the second rotating body 2.

  A rolling bearing 5 is interposed between the first rotating body 1 and the second rotating body 2. Thereby, the 1st rotary body 1 and the 2nd rotary body 2 are connected so that relative rotation is possible. The right side surface of the rolling bearing 5 is in contact with a retaining ring 6 fitted and fixed to the inner peripheral surface of the first rotating body 1, and the left side surface of the rolling bearing 5 is in contact with the inner peripheral surface of the first rotating body 1. It is in contact with the formed step surface. Thereby, the rolling bearing 5 does not shift in the axial direction.

  As shown in FIGS. 2 and 3, the plurality of damper members 4 constituting the damper member 3 are disposed on the left side of the rolling bearing 5 between the first rotating body 1 and the second rotating body 2. As shown in FIG. 3, the plurality of rubber elastic bodies 4 are arranged in a blade shape side by side in the circumferential direction. In other words, each of the plurality of rubber elastic bodies 4 extends while being inclined in the circumferential direction with respect to the radial direction, and more specifically, extending in a direction opposite to the rotation direction (the arrow direction in FIG. 3). ing. In addition, both side surfaces 4c and 4d in the circumferential direction of the plurality of rubber elastic bodies 4 are formed as gently curved surfaces. Among the plurality of rubber elastic bodies 4, a gap is formed between the opposing side surfaces 4 c and 4 d of two adjacent rubber elastic bodies 4. The side surface 4c extends in substantially the same direction as the tangential direction of the outer peripheral surface of the second rotating body 2. The side surface 4d is not parallel to the side surface 4c, but is inclined with respect to the extending direction of the side surface 4c in a direction in which the circumferential length of the rubber elastic body 4 on the first rotating body 1 side becomes longer. Further, as shown in FIG. 2, the left and right end surfaces 4a and 4b of the rubber elastic body 4 are formed orthogonal to the axial direction.

  Examples of the material of the rubber elastic body 4 include ethylene / propylene / diene copolymer rubber (EPDM), natural rubber (NR), chloroprene rubber (CR), hydrogenated nitrile rubber (HNBR), and butyl rubber (BR). Rubber or urethane is used.

  Further, the surfaces of the plurality of rubber elastic bodies 4 on the second rotating body 2 side are joined to a common metal ring 7 by vulcanization adhesion or the like. The axial length of the metal ring 7 is the same as the axial length of the rubber elastic body 4. The metal ring 7 is press-fitted and fixed to the outer peripheral surface of the second rotating body 2. Therefore, the plurality of rubber elastic bodies 4 are fixed to the second rotating body 2 via the metal ring 7. By providing the metal ring 7, the assembly workability of the pulley structure 200 is improved as compared with the case where the plurality of rubber elastic bodies 4 are directly fixed to the second rotating body 2 without the metal ring 7 being interposed.

  Further, the surface of the plurality of rubber elastic bodies 4 on the first rotating body 1 side is covered with a canvas (covering material) 8 having high wear resistance. The surface of the canvas 8 on the first rotating body 1 side is defined as a contact surface 8a. A cylindrical member 9 is fitted and fixed to the inner peripheral surface of the first rotating body 1 at a position facing the contact surface 8a. The cylindrical member 9 has an axial length substantially the same as the axial length of the contact surface 8a. The contact surface 8 a is slidable with respect to the inner peripheral surface of the cylindrical member 9. Therefore, the rubber elastic body 4 is slidably installed on the second rotating body 2 via the canvas 8.

  As the canvas 8, as described above, a fiber fabric having excellent wear resistance and high strength is used. As this fiber fabric, for example, synthetic resin fibers such as aramid and polyparaphenylene benzbisoxazole (PBO), and metal fibers such as stainless steel, brass and copper are used alone or in combination. Further, in addition to the fiber material, a woven fabric in which highly lubricated graphite, molybdenum disulfide, or the like is woven may be used. Thereby, the friction coefficient of the contact surface 8a can be lowered. Moreover, in order to lower the friction coefficient of the contact surface 8a, a carbon-based fiber having high lubricity may be used as the fiber fabric material instead of the fiber material.

  Moreover, as the cylindrical member 9, a synthetic resin, a sintered metal, a bearing material or the like excellent in wear resistance is used.

  The length in the radial direction of the so-called unloaded rubber elastic body 4 (and the canvas 8) to which no external force is applied is based on the radial distance from the inner peripheral surface of the cylindrical member 9 to the outer peripheral surface of the metal ring 7. Is also set slightly larger. For this reason, the plurality of rubber elastic bodies 4 are installed between the cylindrical member 9 and the metal ring 7 in a state of being compressed in the radial direction. That is, the plurality of rubber elastic bodies 4 are installed between the first rotating body 1 and the second rotating body 2 in a state compressed in the radial direction.

  The plurality of rubber elastic bodies 4, the canvas 8 and the metal ring 7 can be produced by integrally forming a long length in the axial direction and then cutting it into a predetermined axial length. Specifically, first, an unvulcanized rubber to be the rubber elastic body 4 and a mold formed in the shape of a gap between two adjacent rubber elastic bodies 4 on the outer peripheral surface of the metal cylinder to be the metal ring 7 Are alternately arranged in the circumferential direction. And after covering the outer side of several unvulcanized rubber with the canvas 8, respectively, it pressurizes and heats and bonds rubber | gum and a metal cylinder with rubber | gum vulcanization | cure. Thereafter, it is cut into a predetermined axial length. By mass-producing this method, the manufacturing cost of the pulley structure 200 can be reduced.

Next, the operation of the pulley structure 200 will be described with reference to FIG.
First, when the rotational speed of the first rotating body 1 is higher than the rotating speed of the second rotating body 2, that is, the first rotating body 1 is in the same direction as the rotating direction with respect to the second rotating body 2 (FIG. The case of relative rotation in the direction of arrow A)) will be described.

  As shown in FIG. 4A, the contact surface 8a slides with respect to the first rotating body 1 (and the cylindrical member 9) by the frictional force between the contact surface 8a of the canvas 8 and the cylindrical member 9, and the arrow Rotate in direction A. Since the rubber elastic body 4 extends in a direction opposite to the rotational direction (the direction of the arrow A) with respect to the radial direction, a compression force is applied in the extending direction (hereinafter referred to as the extending direction). Can receive. Therefore, the rubber elastic body 4 expands in the circumferential direction and the axial direction simultaneously with contraction in the extending direction. Further, when the compressive force in the extending direction acting on the rubber elastic body 4 is increased, the frictional force between the contact surface 8a and the cylindrical member 9 is increased, so that the contact surface 8a and the cylindrical member 9 rotate integrally. As described above, the rubber elastic body 4 receives the compressive force and deforms to absorb the rotational fluctuations of the two rotating bodies 1 and 2, and between the two rotating bodies 1 and 2, the rubber elastic body in a compressed state is compressed. Torque is transmitted through the body 4. Thereby, the slip and tension | tensile_strength fluctuation | variation of the belt 111 wound around the 1st rotary body 1 can be prevented.

  Next, when the rotational speed of the first rotating body 1 is slower than the rotating speed of the second rotating body 2, that is, the first rotating body 1 is opposite to the rotating direction with respect to the second rotating body 2 (FIG. 4 ( The case of relative rotation in the direction of arrow B of b) will be described.

  As shown in FIG. 4B, the contact surface 8a slides against the first rotating body 1 (and the cylindrical member 9) by the frictional force between the contact surface 8a of the canvas 8 and the cylindrical member 9, and the arrow B Rotate in the direction of. Since the rubber elastic body 4 extends in a direction opposite to the rotational direction (the direction of the arrow A) with respect to the radial direction, a tensile force is applied in the extending direction (hereinafter referred to as the extending direction). Can receive. Therefore, the frictional force between the contact surface 8a and the cylindrical member 9 is reduced. When the tensile force acting on the rubber elastic body 4 becomes larger than the frictional force between the contact surface 8a and the cylindrical member 9, the contact surface 8a slides with respect to the cylindrical member 9, and the rubber elastic body 4 moves in the extending direction. It will be in the state which only receives slight tensile force. Therefore, the transmission of torque between the two rotating bodies 1 and 2 is interrupted.

  Here, a conventional pulley structure in which an annular rubber elastic body is installed between the first rotating body and the second rotating body will be described. When the two rotating bodies rotate relative to each other, the annular rubber elastic body receives a shearing force in the circumferential direction, so that shear stress is generated intensively in the inner peripheral portion and the outer peripheral portion of the rubber elastic body. On the other hand, as described above, the plurality of rubber elastic bodies 4 of the present embodiment receive a compressive force or a tensile force in the extending direction when the two rotating bodies rotate relative to each other. In the rubber elastic body 4 that receives a compressive force or a tensile force, stress is less likely to be locally generated compared to a case where a shear force is applied. Therefore, the rubber elastic body 4 is less likely to break than the conventional rubber elastic body that receives a shearing force, and the durability becomes high. In addition, since the durability is high, the length in the axial direction and the length in the radial direction of the rubber elastic body 4 can be made smaller than those of the annular rubber elastic body, so that the size of the pulley structure 200 is reduced. Is possible.

  Next, the relationship between the compressive stress and the compressive strain of the rubber elastic body 4 will be described. In FIG. 5, the vertical axis represents the compressive stress in the radial direction, and the horizontal axis represents the compressive strain in the radial direction. The slope of the curve shown in FIG. 5 represents the compression modulus. As shown in FIG. 5, the slope when the compressive strain ε1 is generated is smaller than the slope where the compressive strain is near zero. In addition, the inclination changes greatly when the compression strain is near zero, whereas the inclination is almost constant in the range from the compression strain ε1 to ε2. Therefore, when the compression is performed from the state where the predetermined compression strain ε1 is generated, the compression deformation is more stable and easier than the case where the compression is performed from the no-load state.

  Therefore, when the first rotating body 1 rotates at a higher speed relative to the second rotating body 2, the rubber elastic body 4 installed in a compressed state in the radial direction between the two rotating bodies 1 and 2 is in an unloaded state. Compared to the case where it is installed, it becomes easier to compress and deform stably. Therefore, since the rubber elastic body 4 can reliably receive a large compressive force, torque can be reliably transmitted between the two rotating bodies 1 and 2.

  Moreover, the contact surface 8a and the cylinder member 9 can be reliably contacted by installing the rubber elastic body 4 in a compressed state in the radial direction.

  Further, since both side surfaces 4c and 4d in the circumferential direction of the rubber elastic body 4 are formed as gentle curved surfaces, the seats when the rubber elastic body 4 receives a compressive force as compared with the case where the rubber elastic body 4 is formed in a flat shape. It becomes difficult to bend and the durability of the rubber elastic body 4 is improved.

  Further, since the surface of the rubber elastic body 4 on the first rotating body 1 side is covered with the canvas 8 having high wear resistance, the rubber elastic body 4 directly slides with respect to the cylindrical member 9. In other words, the rubber elastic body 4 is not worn out or damaged by catching. Therefore, the durability of the rubber elastic body 4 is improved.

  The rubber elastic body 4 is fixed to the second rotating body 2 and slidably installed on the first rotating body 1 in this embodiment, but is fixed to the first rotating body 1 and the second rotating body. 2 may be slidably installed.

  The rubber elastic body 4 may be configured to be fixed to both the first rotating body 1 and the second rotating body 2. In this case, when the first rotating body 1 rotates at a reduced speed with respect to the second rotating body 2, the contact surface 8a rotates together with the first rotating body 1 (tubular member 9). Therefore, the rubber elastic body 4 receives a larger tensile force than the case where the rubber elastic body 4 is slidably installed on the first rotating body 1, so that the rubber elastic body 4 is easily broken and has low durability. In that respect, it is preferable that the rubber elastic body 4 is slidably installed on the first rotating body 1.

  The rubber elastic body 4 may be installed between the first rotating body 1 and the second rotating body 2 in a so-called no-load state where no external force is applied.

  The rubber elastic body 4 is arranged side by side in the circumferential direction, and receives a compressive force when the first rotating body 1 rotates relative to the second rotating body 2 in the rotating direction. If the first rotating body 1 is configured to receive a tensile force when the first rotating body 1 is rotated relative to the second rotating body 2 in the direction opposite to the rotation direction, the first rotating body 1 is inclined in the circumferential direction with respect to the radial direction. It does not have to be extended. For example, the side surface 4d in the circumferential direction of the rubber elastic body 4 is formed as a curved surface having a considerably large curvature with respect to the side surface 4c, and it cannot be said that the rubber elastic body 4 extends while being inclined in the circumferential direction. Such a configuration may be adopted.

Second Embodiment
Next, a second embodiment of the present invention will be described focusing on differences from the first embodiment. However, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted as appropriate.

  As shown in FIG. 6, the pulley structure 200 </ b> A of the present embodiment includes two restricting members 20 and 21 disposed on both the left and right sides of the rubber elastic body 4.

  The restricting member 20 disposed on the left side of the rubber elastic body 4 includes a disk-shaped wall plate 22 formed orthogonal to the axial direction, an outer cylinder portion 24 projecting to the left from the outer peripheral edge of the wall plate 22, It is comprised from the inner cylinder part 25 which protrudes to the left from the inner peripheral edge part of the wall board 22, and the canvas 27 which covers the surface of the inner cylinder part 25. As shown in FIG. On the other hand, the restricting member 21 disposed on the right side of the rubber elastic body 4 includes a disk-shaped wall plate 23 formed orthogonal to the axial direction, and an outer cylindrical portion 26 protruding rightward from the outer peripheral edge of the wall plate 23. It consists of.

  The outer cylinder portions 24 and 26 are fitted and fixed to the inner peripheral surface of the first rotating body 1. Accordingly, the two restricting members 20 and 21 are fixed to the inner peripheral surface of the first rotating body 1.

  Surfaces 22a and 23a of the wall plates 22 and 23 on the rubber elastic body 4 side (hereinafter referred to as contact surfaces) 22a and 23a are opposed to the left and right end surfaces 4a and 4b of the rubber elastic body 4 with a predetermined gap therebetween. Yes.

  The wall plates 22 and 23 are made of, for example, a synthetic resin material excellent in wear resistance such as polytetrafluoroethylene (PTFE), ultrahigh molecular weight polyethylene, polyamide, polyacetal, or a thin metal plate. Therefore, the rigidity of the wall plates 22 and 23 is relatively low.

  Further, the contact surfaces 22a and 23a are covered with a coating (not shown) having excellent wear resistance and high lubricity. Examples of the coating material include carbon, polytetrafluoroethylene (PTFE), and boron. In addition, when the wall boards 22 and 23 are formed with the said synthetic resin material, it is not necessary to provide the said film.

  Further, the inner peripheral surface of the inner cylinder portion 25 of the regulating member 20 is covered with a canvas 27. The surface of the canvas 27 on the second rotating body 2 side can slide with respect to the outer peripheral surface of the second rotating body 2 with low friction.

Next, the operation of the pulley structure 200A will be described.
When the rotational speed of the first rotating body 1 becomes higher than the rotating speed of the second rotating body 2, the plurality of rubber elastic bodies 4 are compressed and contracted in the extending direction, and simultaneously expand in the axial direction and the circumferential direction. Then, the gap between the left and right end surfaces 4a, 4b of the rubber elastic body 4 and the contact surfaces 22a, 23a of the regulating members 20, 21 is clogged, and the end surfaces 4a, 4b are in contact with the contact surfaces 22a, 23a, respectively. To do. Thereby, since the further deformation | transformation of the rubber elastic body 4 is controlled, durability of the rubber elastic body 4 improves. The size of the gap between the end surfaces 4a and 4b of the rubber elastic body 4 and the contact surfaces 22a and 23a is, for example, the twist angle of the rubber elastic body 4 (the first elastic elastic body 4 centering on the shaft 3). The rotational angle of the displacement between the surface on the rotating body 1 side and the surface on the second rotating body 2 side) is set to be 20 degrees or less.

  Further, since the wall plates 22 and 23 are made of a material having low rigidity, and the friction coefficient of the contact surfaces 22a and 23a is low, the expansion deformation in the axial direction of the rubber elastic body 4 is rapidly restricted. Absent. That is, after the rubber elastic body 4 is smoothly deformed, further deformation is restricted. Therefore, the rubber elastic body 4 is not easily damaged and the durability is improved.

  Further, since the contact surfaces 22a and 23a are covered with a highly lubricious film, when the rubber elastic body 4 comes into contact with the contact surfaces 22a and 23a, the end surfaces 4a and 4b of the rubber elastic body 4 are It can prevent rubbing and deterioration.

  In addition, although the surface at the side of the rubber elastic body 4 of the wall plates 23 and 23 is covered with a carbon-based coating (not shown) in the present embodiment, it may be covered with a canvas. As the canvas, one having excellent wear resistance and high lubricity is used. For example, a fabric made of carbon fiber can be used. Alternatively, a fabric in which the surface of a fiber fabric made of a high-strength fiber material is coated with a polytetrafluoroethylene (PTFE) -based or boron-based coating may be used.

  Further, the regulating members 20 and 21 may be fixed to the outer peripheral surface of the second rotating body 2 instead of being fixed to the inner peripheral surface of the first rotating body 1. Specifically, the restriction member 20 may be configured such that the inner cylinder portion 25 is fixed to the second rotating body 2 and the outer cylinder portion 24 is slidable with respect to the first rotating body 1. The restricting member 21 includes an inner cylinder portion formed on the inner peripheral edge portion of the wall plate 23 instead of the outer cylinder portion 26, and the inner cylinder portion is fixed to the second rotating body 2. Also good.

  Moreover, although the pulley structure 200A includes the two restricting members 20 and 21 in the present embodiment, the pulley structure 200A may be configured to include only one of them.

<Third Embodiment>
Next, a third embodiment of the present invention will be described focusing on differences from the first embodiment. However, those having the same configuration as in the first embodiment are given the same reference numerals and description thereof is omitted as appropriate.

  As shown in FIG. 7, the pulley structure 200 </ b> B of the present embodiment includes a plurality of deformation absorbing members 30. The plurality of deformation absorbing members 30 are respectively interposed in the gaps between two adjacent rubber elastic bodies 4 among the plurality of rubber elastic bodies 4. The deformation absorbing member 30 is formed of a material having an elastic modulus lower than that of the rubber elastic body 4 such as foamed rubber, foamed urethane, a mixture of a hollow balloon and rubber.

  The length in the radial direction and the axial direction of the deformation absorbing member 30 in an unloaded state is slightly shorter than that of the rubber elastic body 4 in a state installed between the two rotating bodies 1 and 2. Further, the cross-sectional shape orthogonal to the axial direction of the deformation absorbing member 30 in the no-load state is substantially the same as or slightly more than the cross-sectional shape orthogonal to the axial direction of the gap between the two adjacent rubber elastic bodies 4 in the no-load state. large. The rubber elastic body 4 is installed between the two rotating bodies 1 and 2 in a state compressed in the radial direction, contracted in the radial direction, and expanded in the circumferential direction. Therefore, the deformation absorbing member 30 is installed in a state where it is pressed by the rubber elastic body 4 and compressed in the circumferential direction.

Next, the operation of the pulley structure 200B will be described.
When the rotational speed of the first rotating body 1 is higher than the rotating speed of the second rotating body 2, the rubber elastic body 4 is compressed and contracted in the extending direction, and at the same time tries to expand in the circumferential direction. At this time, since both side surfaces 4c and 4d in the circumferential direction of the rubber elastic body 4 are in contact with the two deformation absorbing members 30, the rubber elastic body 4 is pressed in the circumferential direction while pressing the deformation absorbing member 30. Smoothly expands and deforms. Therefore, the rubber elastic body 4 is less likely to buckle because rapid deformation in the circumferential direction is suppressed, and durability is improved.

  In the present embodiment, the deformation absorbing member 30 is installed between the two rotating bodies 1 and 2 in a compressed state in the circumferential direction, but may be installed in a state where no external force is applied. Here, the relationship between the stress and the strain of the rubber elastic body 4 shown in FIG. 5 is also established for the deformation absorbing member 30 formed of foamed rubber or the like. That is, the compression elastic modulus of the deformation absorbing member 30 in a state where the predetermined compressive strain is generated is smaller than the compression elastic modulus in a state where the compression strain is zero. Therefore, the rubber elastic body 4 sandwiched between the deformation absorbing members 30 in the compressed state expands more smoothly in the circumferential direction than the rubber elastic body 4 sandwiched between the deformation absorbing members 30 in the unloaded state. It becomes difficult to bend. In this respect, the deformation absorbing member 30 is preferably installed between the two rotating bodies 1 and 2 in a compressed state.

  Further, the pulley structure 200B may be configured to include the two regulating members 20 and 21 included in the pulley structure 200A of the second embodiment.

<Fourth embodiment>
Next, a fourth embodiment of the present invention will be described focusing on differences from the first embodiment. However, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted as appropriate.

  As shown in FIG. 8, the pulley structure 200 </ b> C of the present embodiment includes the first rotating body 1 and the second rotating body 1 in addition to the first rotating body 1 and the second rotating body 2 having the same configuration as the first embodiment. A first damper member 10 disposed between the rotating body 2 and a second damper member 11 disposed on the left side of the first damper member 10 between the first rotating body 1 and the second rotating body 2; Three restriction members 50, 51, 52 are provided. The restriction member 50 is disposed between the first damper member 10 and the second damper member 11. The restriction member 51 and the restriction member 52 are disposed on the left side of the first damper member 10 and the right side of the second damper member 11, respectively.

  As shown in FIG. 9, the 1st damper member 10 is comprised from the some rubber elastic body 12 arrange | positioned along with the circumferential direction. Each of the plurality of rubber elastic bodies 12 extends while being inclined in the circumferential direction with respect to the radial direction, and more specifically, extending in a direction opposite to the rotation direction (the arrow direction in FIG. 8). . In addition, both side surfaces 12c and 12d in the circumferential direction of the rubber elastic body 12 are formed as gently curved surfaces. In addition, a slight gap (not shown) is formed between the opposing side surfaces 12 c and 12 d of two adjacent rubber elastic bodies 12 among the plurality of rubber elastic bodies 12. The side surfaces 12 c and 12 d extend in substantially the same direction as the tangential direction of the outer peripheral surface of the second rotating body 2. Therefore, the circumferential length of the rubber elastic body 12 increases from the inner peripheral side toward the outer peripheral side.

  As shown in FIG. 8, the left end surface 12a of the rubber elastic body 12 is formed orthogonal to the axial direction. The right end surface 12b of the rubber elastic body 12 is formed in a gently curved surface. The right end surface 12b is inclined in a direction in which the axial length of the rubber elastic body 12 increases from the outer peripheral side toward the inner peripheral side. Specifically, the area of the cross section perpendicular to the extending direction of the rubber elastic body 12 is set to be substantially constant. That is, the ratio of the circumferential lengths of the inner peripheral portion and the outer peripheral portion of the rubber elastic body 12 is almost opposite to the ratio of the axial lengths of the inner peripheral portion and the outer peripheral portion.

  As shown in FIG. 9, the 2nd damper member 11 is comprised from the several rubber elastic body 13 arrange | positioned along with the circumferential direction. The plurality of rubber elastic bodies 13 are each inclined and extended in the circumferential direction with respect to the radial direction, and more specifically, are inclined and extended in the rotation direction (the arrow direction in FIG. 8). That is, the plurality of rubber elastic bodies 12 and the plurality of rubber elastic bodies 13 are inclined in directions opposite to each other in the radial direction. Both side surfaces 13c and 13d in the circumferential direction of the rubber elastic body 13 are formed as gentle curved surfaces as the side surfaces 12c and 12d. Further, among the plurality of rubber elastic bodies 13, a slight gap (not shown) is formed between the side surfaces 13 c and 13 d facing each other between two adjacent rubber elastic bodies 13.

  Further, as shown in FIG. 8, the left and right end faces 13 a and 13 b of the rubber elastic body 13 are respectively formed in symmetrical shapes with respect to the end faces 12 b and 12 a of the rubber elastic body 12.

  The rubber elastic bodies 12 and 13 are made of the same material as the rubber elastic body 4 of the first embodiment.

  The surfaces of the plurality of rubber elastic bodies 12 and 13 on the second rotating body 2 side are joined to a common metal ring 40 by vulcanization adhesion or the like. The metal ring 40 is press-fitted and fixed to the outer peripheral surface of the second rotating body 2. Therefore, the plurality of rubber elastic bodies 12 and 13 are fixed to the second rotating body 2 via the metal ring 40. Note that the metal ring 40 may be formed by connecting and integrating a metal ring joined to the rubber elastic body 12 and a metal ring joined to the rubber elastic body 13.

  Further, the surfaces of the plurality of rubber elastic bodies 12 on the first rotating body 1 side are joined to a common metal ring 41 by vulcanization adhesion or the like. Further, the surfaces of the plurality of rubber elastic bodies 13 on the first rotating body 1 side are joined to a common metal ring 42 by vulcanization adhesion or the like. The metal rings 41 and 42 are press-fitted and fixed to the inner peripheral surface of the first rotating body 1, respectively. Therefore, the plurality of rubber elastic bodies 12 and 13 are fixed to the first rotating body 1 via the metal rings 41 and 42, respectively. The inner diameters of the metal rings 41 and 42 are the same.

  The rubber elastic body 12 performs the first rotation in a state where the outer peripheral surface is twisted in the arrow direction (rotation direction) of FIG. 9 with respect to the inner peripheral surface, that is, in a state compressed in the extending direction of the rubber elastic body 12. It is arranged between the body 1 and the second rotating body 2. Further, the plurality of rubber elastic bodies 13 are in a state where the outer peripheral surface is twisted in the direction opposite to the arrow direction in FIG. In a compressed state, the first rotary body 1 and the second rotary body 2 are disposed.

  The radial lengths of the rubber elastic bodies 12 and 13 in the unloaded state are the same as each other, and are the same as the distance in the radial direction from the outer peripheral surface of the metal ring 40 to the inner peripheral surfaces of the metal rings 41 and 42. Further, among the rubber elastic bodies 12 (13) in an unloaded state, a gap of, for example, 0.05 m or less is provided between the side surfaces 12c, 12d (13c, 13d) facing two adjacent rubber elastic bodies 12 (13). May be formed, but may be in contact.

  Moreover, as shown in FIG. 8, the regulating member 50 disposed between the plurality of rubber elastic bodies 12 and the plurality of rubber elastic bodies 13 is formed in an annular plate shape. The outer peripheral side end of the regulating member 50 is fixed between the metal rings 41 and 42 by fitting or the like. Thereby, the regulating member 50 is fixed to the first rotating body 1 via the metal rings 41 and 42. Further, a portion excluding the outer peripheral side end portion of the regulating member 50 is defined as a wall portion 53. The left and right side surfaces of the wall portion 53 are disposed to face the right end surface 13b of the rubber elastic body 13 and the left end surface 12a of the rubber elastic body 12 with a predetermined gap therebetween.

  The restricting member 51 disposed on the right side of the plurality of rubber elastic bodies 12 includes an annular wall portion 54 and an outer cylinder portion 56 that protrudes to the right from the outer peripheral edge portion of the wall portion 54. The restricting member 52 disposed on the left side of the plurality of rubber elastic bodies 13 includes an annular wall portion 55 and an outer cylinder portion 57 that protrudes to the left from the outer peripheral edge portion of the wall portion 55. The outer cylinder portions 56 and 57 are fitted and fixed to the inner peripheral surface of the metal ring 41, respectively. Thereby, the regulation members 51 and 52 are being fixed to the 1st rotary body 1 via the metal rings 41 and 42, respectively. Further, the surface of the wall 54 on the rubber elastic body 12 side is opposed to the right end surface 12b of the rubber elastic body 12 with a predetermined gap therebetween. Further, the surface of the wall 55 on the rubber elastic body 13 side is disposed to face the left end surface 13a of the rubber elastic body 13 with a predetermined gap.

  The wall portions 53 to 55 are formed of a synthetic resin material similar to the wall plates 22 and 23 of the first embodiment or a thin metal plate. Further, the surfaces of the wall portions 53 to 55 facing the rubber elastic bodies 12 and 13 are covered with a coating having excellent wear resistance and high lubricity, like the contact surfaces 22a and 23a of the first embodiment. Has been.

  An annular member 43 is arranged on the left side of the second damper member 11 between the first rotating body 1 and the second rotating body 2. A flange portion is formed on each of the inner peripheral edge portion and the outer peripheral edge portion of the annular member 43. The flange on the outer peripheral side of the annular member 43 is fitted and fixed to the first rotating body 1. Further, the flange portion on the inner peripheral side of the annular member 43 is connected to the second rotating body 2 via a sliding bearing 44. A space formed between the annular member 43 and the rolling bearing 5 between the first rotating body 1 and the second rotating body 2 is referred to as a rubber accommodating space 45.

  A communication hole 60 extending in the axial direction is formed on the inner peripheral side of the annular member 43. Further, the first rotating body 1 is formed with a communication hole 61 extending substantially in the radial direction. The rubber housing space 45 communicates with the outside through the communication holes 60 and 61. Each of the communication holes 60 and 61 may be one or plural. Further, the communication holes 60 and 61 are respectively provided with filters (not shown) for preventing foreign substances from entering from the outside.

Next, the operation of the pulley structure 200C will be described.
When the two rotating bodies 1 and 2 are relatively rotated, one of the rubber elastic bodies 12 and 13 receives a compressive force in the extending direction, and the other receives a tensile force in the extending direction. Specifically, when the rotational speed of the first rotating body 1 is higher than the rotating speed of the second rotating body 2, the plurality of rubber elastic bodies 12 receive a compressive force, and the plurality of rubber elastic bodies 13 exert a tensile force. receive. Conversely, when the rotational speed of the first rotating body 1 is slower than the rotating speed of the second rotating body 2, the plurality of rubber elastic bodies 12 receive a tensile force, and the plurality of rubber elastic bodies 13 receive a compressive force.

  A case where the rotation speed of the first rotating body 1 is higher than the rotation speed of the second rotating body 2 will be described in detail. The rubber elastic body 12 is compressed and contracted in the extending direction, and simultaneously expands in the axial direction and deforms as shown in FIG. 10 in the circumferential direction. Since the volume of the rubber elastic body 12 does not change even if it is changed by receiving a force, the gap in the circumferential direction is increased by the amount of expansion in the axial direction. On the other hand, the rubber elastic body 13 is stretched and deformed by being pulled in the extending direction. When the rubber elastic bodies 12 and 13 are deformed by receiving force, the rotational fluctuations of the two rotating bodies 1 and 2 are absorbed, and between the two rotating bodies 1 and 2 via the rubber elastic bodies 12 and 13. Torque is transmitted. Thereby, the slip and tension | tensile_strength fluctuation | variation of the belt 111 wound around the 1st rotary body 1 can be prevented.

  Further, when the rubber elastic body 12 expands in the axial direction, the gap between the left and right end faces 12a, 12b of the rubber elastic body 12 and the wall portions 53, 54 is clogged, and the left and right end faces 12a, 12b become the wall portions 53, 54. And a frictional force is generated between the end surfaces 12a and 12b and the wall portions 53 and 54, respectively. Further, when the axial force from the rubber elastic body 12 to the walls 53 and 54 increases, the frictional force increases, and further deformation of the rubber elastic body 12 is restricted. Therefore, the durability of the rubber elastic body 12 is improved.

  On the other hand, when the rotational speed of the 1st rotary body 1 becomes slower than the rotational speed of the 2nd rotary body 2, the effect | action of the rubber elastic bodies 12 and 13 becomes reverse to the above case.

  Further, for example, when the rubber elastic body 12 receives a tensile force, the rubber elastic body 13 receives the compressive force and deforms to absorb rotational fluctuations. Therefore, the tensile force received by the rubber elastic body 12 is the rubber elastic body. This is reduced compared to the case where 13 is not provided. As described above, when one of the rubber elastic bodies 12 and 13 receives a tensile force, the other receives a compressive force, whereby the tensile force received by the rubber elastic bodies 12 and 13 can be reduced. Therefore, the durability of the rubber elastic bodies 12 and 13 is improved.

  Further, for example, when the rubber elastic body 12 receives a tensile force, the deformation of the rubber elastic body 13 is restricted by the wall portions 53 and 55, thereby further restricting relative rotation of the two rotating bodies 1 and 2. The Rukoto. Thereby, the further elastic deformation of the rubber elastic body 12 is also controlled. In this way, by providing the restricting members for the rubber elastic bodies 12 and 13, respectively, when one of the rubber elastic bodies 12 and 13 receives a compressive force, not only the deformation thereof but also the tensile force is controlled. Since the other deformation deformation received is also restricted, the durability of the rubber elastic bodies 12 and 13 is further improved.

  The rubber elastic bodies 12 and 13 are installed between the two rotating bodies 1 and 2 in a compressed state with respect to the extending direction. Therefore, for example, when the two rotating bodies 1 and 2 rotate relative to each other in the direction in which the rubber elastic body 12 receives a tensile force, the tensile stress of the rubber elastic body 12 is reduced as compared with the case where the rubber elastic body 12 is installed in an unloaded state. be able to. In this case, the compressive stress of the rubber elastic body 13 is larger than that in a case where the rubber elastic body 13 is installed in an unloaded state, but generally, rubber is strong against compression, but is easily broken by tension and weak. Therefore, the durability of the rubber elastic bodies 12 and 13 can be improved by reducing the tensile stress acting on the rubber elastic bodies 12 and 13.

  In addition, the rubber elastic bodies 12 and 13 are installed in a compressed state in the extending direction, respectively, so that the rubber elastic bodies 12 and 13 can be stably compressed and deformed more stably than when installed in an unloaded state. Therefore, the rubber elastic bodies 12 and 13 can reliably absorb the rotational fluctuations of the two rotating bodies 1 and 2.

  Further, since the rubber elastic bodies 12 and 13 are set so that the area of the cross section perpendicular to the extending direction (compressing direction) is substantially constant, when the compressive force is applied in the extending direction, the compressive stress is reduced. Almost uniform.

  Further, among the plurality of rubber elastic bodies 12, the gap between the opposing side surfaces 12c and 12d of the two adjacent rubber elastic bodies 12 is relatively small, so that the rubber elastic body 12 buckles when it receives a compressive force. It becomes difficult. The same effect can be obtained with the rubber elastic body 13.

  Further, the rubber elastic bodies 12 and 13 generate heat by repeating deformation. Here, since the rubber accommodating space 45 communicates with the outside through the communication holes 60 and 61, when the rotating bodies 1 and 2 rotate, external air is brought into the rubber accommodating space 45 from the communication hole 60 by centrifugal force. And is discharged from the communication hole 61. That is, in the rubber accommodating space 45, an air flow from the second rotating body 2 side to the first rotating body 1 side is generated. Since the rubber elastic bodies 12 and 13 are cooled by the air flow, deterioration due to heat can be prevented.

  In this embodiment, the rubber elastic bodies 12 and 13 are arranged between the two rotating bodies 1 and 2 while being compressed in the extending direction, but may be arranged in an unloaded state. Good.

  Further, the radial lengths of the rubber elastic bodies 12 and 13 in an unloaded state are formed slightly larger than the radial distance from the outer peripheral surface of the metal ring 40 to the inner peripheral surfaces of the metal rings 41 and 42, and the rubber elasticity The bodies 12 and 13 may be installed between the metal ring 40 and the metal rings 41 and 42 in a compressed state with respect to the radial direction.

  Moreover, although the end surfaces 12a and 13b of the rubber elastic bodies 12 and 13 are formed so as to be orthogonal to the axial direction in this embodiment, they may be formed in the same shape as the end surfaces 13a and 12b, respectively. That is, the rubber elastic bodies 12 and 13 may be formed in a substantially truncated cone shape in the axial section. However, in this case, two regulating members are required for the end faces 12a and 13b. On the other hand, in this embodiment, since one regulating member 50 can be shared with the end faces 12a and 13b, the number of parts of the pulley structure 200C can be reduced and the weight can be reduced. In this respect, the present embodiment is preferable.

  In addition, the surfaces of the wall portions 53 to 55 facing the rubber elastic bodies 12 and 13 are covered with a highly lubricious film in this embodiment, but the surface on which the friction coefficient against rubber is increased instead of the film. Processing may be performed. Examples of the surface treatment include shot blasting and oxide film treatment. Thereby, for example, when the rubber elastic body 12 receives a compressive force and comes into contact with the wall portions 53 and 54, a large frictional force is generated between the rubber elastic body 12 and the wall portions 53 and 54. At a stage where the amount of deformation is smaller than that of the present embodiment, deformation of the rubber elastic body 12 is restricted. Therefore, the durability of the rubber elastic body 12 is further improved.

  The rubber elastic bodies 12 and 13 may be fixed to one of the two rotating bodies 1 and 2 and configured to be slidable with respect to the other. In this case, the surface on the other rotating body side of the rubber elastic bodies 12 and 13 is covered with a canvas or the like having high wear resistance.

  As mentioned above, although 1st Embodiment thru | or 4th Embodiment was described as suitable embodiment of this invention, the pulley structure of the said 1st Embodiment thru | or 3rd Embodiment is 4th instead of the damper member 3. As shown in FIG. The structure provided with the 1st damper member 10 of embodiment may be sufficient.

  First Embodiment The pulley structures 200, 200A, 200B, and 200C of the first to fourth embodiments are not limited to those connected to the drive shaft 103 of the alternator. For example, the drive shaft 104 of the air compressor, the drive shaft 105 of the power steering, and the drive shaft 106 of the water pump may be connected.

It is the schematic which shows the structure of the auxiliary machinery drive system of a motor vehicle. It is an axial sectional view of the pulley structure concerning a 1st embodiment of the present invention. It is the III-III sectional view taken on the line of FIG. (A) is sectional drawing of the state to which the rubber elastic body received the compressive force, (b) is sectional drawing of the state to which the rubber elastic body received the tensile force. It is a graph which shows the relationship between the stress and distortion of a rubber elastic body. It is an axial sectional view of a pulley structure according to a second embodiment of the present invention. It is sectional drawing of the pulley structure which concerns on 3rd Embodiment of this invention, and is a figure equivalent to FIG. It is an axial sectional view of the pulley structure concerning a 4th embodiment of the present invention. It is the IX-IX sectional view taken on the line of FIG. It is sectional drawing of the state in which the rubber elastic body received the compressive force.

Explanation of symbols

100 Auxiliary machine drive system 101 Crankshaft (output shaft)
102 pulley (first pulley)
103, 104, 105, 106 Drive shaft (auxiliary drive shaft)
107, 108, 109, 110 Pulley (second pulley)
111 Belts 200, 200A, 200B, 200C Pulley structure 1 First rotating body 2 Second rotating body 3 Damper member (first damper member)
4 Rubber elastic bodies 4a, 4b End face 8 Canvas (covering material)
20, 21 Restriction member 22, 23 Wall plate 30 Deformation absorbing member 10 First damper member 11 Second damper member 12, 13 Rubber elastic bodies 12a, 12b, 13a, 13b End surfaces 50, 51, 52 Restriction members 53, 54, 55 Wall

Claims (11)

A cylindrical first rotating body around which a belt is wound;
A cylindrical second rotating body provided inside the first rotating body so as to be rotatable relative to the first rotating body;
A first damper member made of a plurality of rubber elastic bodies arranged side by side in the circumferential direction of the rotating body between the first rotating body and the second rotating body;
With
When the first rotating body rotates relative to the second rotating body in a predetermined direction, the plurality of rubber elastic bodies receive a compression force, respectively, while the first rotating body becomes the second rotating body. On the other hand, the pulley structure is configured such that each of the plurality of rubber elastic bodies receives a tensile force when rotated relative to a direction opposite to the predetermined direction.   2. The pulley structure according to claim 1, wherein each of the plurality of rubber elastic bodies extends while being inclined in the circumferential direction with respect to a radial direction of the rotating body. A regulating member disposed on at least one side of the rubber elastic body with respect to the axial direction of the rotating body,
The rubber elastic body receives the compression force, expands and deforms in the axial direction, and contacts the regulating member to restrict further deformation of the rubber elastic body. 2. The pulley structure according to 2. A plurality of rubber elastic members disposed between the first rotating body and the second rotating body, adjacent to the first damper member in the axial direction of the rotating body and arranged side by side in the axial direction of the rotating body. A second damper member comprising a body,
When the first rotating body rotates relative to the second rotating body in a predetermined direction, the plurality of rubber elastic bodies constituting the plurality of second damper members receive a tensile force, respectively, When the one rotating body rotates relative to the second rotating body in the direction opposite to the predetermined direction, each of the plurality of rubber elastic bodies constituting the plurality of second damper members receives a compressive force. The pulley structure according to claim 1, wherein the pulley structure is configured. Each of the plurality of rubber elastic bodies extends while being inclined in the circumferential direction with respect to the radial direction of the rotating body,
Furthermore, the inclined directions of the plurality of rubber elastic bodies constituting the first damper member and the plurality of rubber elastic bodies constituting the second damper member with respect to the radial direction are opposite to each other. The pulley structure according to claim 4. Restricting members arranged on at least one side of the rubber elastic body constituting the first damper member and at least one side of the rubber elastic body constituting the second damper member with respect to the axial direction of the rotating body. Prepared,
The rubber elastic body receives the compression force, expands and deforms in the axial direction, and contacts the regulating member to restrict further deformation of the rubber elastic body. The pulley structure according to claim 5.   The plurality of rubber elastic bodies are fixed to any one of the first rotating body and the second rotating body, and are slidable with respect to the other rotating body. The pulley structure according to any one of claims 1 to 6.   8. The pulley structure according to claim 7, wherein a surface of the plurality of rubber elastic bodies on the other rotating body side is coated with a highly wear-resistant coating material.   The pulley according to claim 1, wherein the rubber elastic body is installed in a compressed state with respect to the radial direction between the first rotating body and the second rotating body. Structure.   It is made of a material having an elastic modulus lower than the elastic modulus of the rubber elastic body, and includes a plurality of deformation absorbing members interposed between the two rubber elastic bodies adjacent to each other in the circumferential direction among the plurality of rubber elastic bodies. The pulley structure according to any one of claims 1 to 9, wherein An auxiliary machine drive system for driving a plurality of auxiliary machines including an alternator,
An output shaft coupled to the engine;
A first pulley provided on the output shaft;
A plurality of accessory drive shafts respectively connected to the plurality of accessories;
A plurality of second pulleys respectively provided on the plurality of accessory drive shafts;
A belt wound around the first pulley and the plurality of second pulleys;
Including
The auxiliary pulley drive system according to any one of claims 1 to 10, wherein the second pulley provided on at least the auxiliary drive shaft of the alternator among the plurality of second pulleys is the pulley structure according to any one of claims 1 to 10. .

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