JP2007263315A - Pulley - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pulley capable of absorbing rotational fluctuation in various input modes. <P>SOLUTION: The pulley 1A is equipped with a hub 2 fixed to a rotary shaft and having a hub side rotation transmitting projection 11, a pulley body 3 having a body side rotation transmitting projection 13, and rotational fluctuation absorbing members 5 disposed in a plurality of rotational fluctuation absorbing spaces 15 formed between the hub side rotation transmitting projection 11 and the body side rotation transmitting projection 13. In the pulley 1A, rotation between the pulley body 3 and the hub 2 is transmitted by the rotational fluctuation absorbing members 5. Each of the rotational fluctuation absorbing members 5 is composed of a first elastic body 16, a second elastic body 18, and either of leaf springs of a first leaf spring 17b and a second leaf spring 17c disposed deformably together in the circumferential direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pulley that is used in a winding transmission mechanism and that can absorb belt tension fluctuation caused by rotational fluctuation on a driving side.

  For example, a wrapping transmission mechanism is used to transmit the rotational force of the engine to an auxiliary machine (air conditioner compressor, power steering, alternator, water pump, etc.). As a conventional auxiliary machine-side pulley used in this winding transmission mechanism, there is one disclosed in Patent Document 1.

  As shown in FIGS. 12 and 13, the auxiliary machine side pulley 100 is provided with a hub 101 fixed to an auxiliary machine side rotating shaft (not shown) and rotatably provided on the outer peripheral side of the hub 101. Formed by a pulley body 102 having a belt (not shown) wound around the surface, three hub side rotation transmission protrusions 101a of the hub 101, and three body side rotation transmission protrusions 102a of the pulley body 102. Six elastic bodies 104 respectively disposed in the six rotation fluctuation absorbing spaces 103, a pair of metal bearings 105 and 106 disposed on both side surfaces of each elastic body 104, and the hub 101 are press-fitted into the pulleys. The main body 102 and a pair of metal bearings 105, 106 are configured with a stopper plate 107 that prevents movement in the axial direction.

  In the above configuration, when a moving force acts on a belt (not shown) due to the rotation of the driving pulley (not shown), the pulley body 102 of the auxiliary pulley 100 is rotated by the frictional force with the belt (not shown). Power is transmitted. Then, each main body side rotation transmission protrusion 102 a of the pulley main body 102 transmits the rotation to the hub side rotation transmission protrusion 101 a of the hub 101 via each elastic body 104. The rotation of the hub 101 rotates an auxiliary machine side rotation shaft (not shown).

In the rotation transmission process, when a rotation fluctuation occurs in the rotation on the driving side, the moving speed of a belt (not shown) fluctuates due to the rotation fluctuation. On the other hand, since the auxiliary side tries to rotate at a constant rotation speed due to inertia, a fluctuation in tension occurs in a belt (not shown). However, if the pulley body 102 has a rotation variation, the elastic body 104 transmits the rotation to the hub 101 while elastically deforming to absorb the rotation variation. Thereby, fluctuations in tension of the belt (not shown) are absorbed, and durability of the belt (not shown) is improved.
Japanese Patent Laid-Open No. 2004-232778

  However, since the conventional auxiliary pulley 100 is configured to absorb the tension of a belt (not shown) by an elastic body 104 such as rubber, it cannot cope with rotational fluctuations in various input modes. That is, since the elastic body 104 such as rubber has a low spring constant, it can absorb the rotational fluctuation with respect to the rotational fluctuation at low torque. However, the rotational fluctuation at the time of high torque in which the input load exceeding the spring constant of the elastic body 104 acts cannot be absorbed. Therefore, with the conventional auxiliary pulley 100, the durability of the belt (not shown) could not be sufficiently achieved.

  Accordingly, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a pulley that can absorb rotational fluctuations in various input modes.

  According to the first aspect of the present invention, there is provided a hub that is fixed to the rotating shaft and has a hub-side rotation transmission protrusion, a pulley body that is rotatably provided on the outer periphery of the hub and has a body-side rotation transmission protrusion, and the hub side. A rotation fluctuation absorbing member disposed in a plurality of rotation fluctuation absorbing spaces formed between the rotation transmission protrusion and the main body side rotation transmission protrusion, and the rotation between the pulley body and the hub absorbs the rotation fluctuation. In the pulley transmitted through the member, each of the rotation fluctuation absorbing members is composed of an elastic body and a leaf spring member arranged so as to be deformable together in the circumferential direction.

  The invention according to claim 2 is the pulley according to claim 1, wherein the leaf spring member includes a first leaf spring and a second leaf spring, and the first spring receives a compression force according to one rotational fluctuation direction. The leaf spring and the second leaf spring that receives a compressive force depending on the other rotational fluctuation direction have different spring constants.

  A third aspect of the invention is the pulley according to the first aspect, wherein the leaf spring member includes a first leaf spring and a second leaf spring, and the first spring receives a compressive force according to one rotational fluctuation direction. The spring constant of the leaf spring and the second leaf spring that receives the compressive force by the other rotational fluctuation direction is the same.

  Invention of Claim 4 is a pulley of any one of Claims 1-3, Comprising: The 1st leaf | plate spring which is the said leaf | plate spring member each arrange | positioned in the said rotation fluctuation absorption space adjacent, and 1st The two leaf springs are characterized by being integrally formed by a connecting portion.

  The invention according to claim 5 is the pulley according to claim 4, wherein the elastic body includes a first elastic body fixed to one of the hub and the pulley body, and first and second leaf springs. And a second elastic body fixed to a plate spring member formed integrally.

  As described above, according to the first aspect of the present invention, when there is rotational fluctuation at low torque, the leaf spring does not compressively deform, but the elastic body compresses and absorbs rotational fluctuation, and rotational fluctuation occurs at high torque. In this case, the elastic body compresses and deforms to the maximum and does not contribute to the absorption of rotational fluctuations, but the leaf spring compresses and absorbs rotational fluctuations. Therefore, it is possible to absorb rotational fluctuations during various input modes.

  According to the invention of claim 2, in addition to the effect of the invention of claim 1, there may be a case where different rotational fluctuation absorption characteristics are required depending on the direction of rotational fluctuation, and a pulley suitable for such conditions can be provided.

  According to the invention of claim 3, in addition to the effect of the invention of claim 1, the same rotation fluctuation absorption characteristic may be necessary regardless of the direction of the rotation fluctuation, and a pulley suitable for such conditions can be provided.

  According to the invention of claim 4, in addition to the effects of the inventions of claims 1 to 3, the first and second leaf springs are assembled to the two rotational fluctuation absorbing spaces only by assembling the leaf spring member. As a result, assembly is improved. Further, since the first and second leaf springs are connected to each other, it is possible to avoid as much as possible the situation where the first and second leaf springs fall off from the rotational fluctuation absorbing space or the proper arrangement posture is lost.

  According to the fifth aspect of the invention, in addition to the effect of the fourth aspect of the invention, the first elastic body can be assembled simply by disposing the leaf spring in the rotation fluctuation absorbing space, and the assemblability is further improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
1 to 6 show a first embodiment of the present invention. FIG. 1 is an exploded perspective view of an auxiliary pulley 1A, FIG. 2 is a sectional view of the auxiliary pulley 1A, and FIG. 4 is a front view of the hub, FIG. 5 is a front view of the pulley body 3 and the first elastic body 16, and FIG. 6 is a front view of the pair of leaf spring members 17 and the second elastic body 18.

  1 to 3, an auxiliary machine side pulley 1 </ b> A, which is a pulley, is disposed on an outer peripheral side of the hub 2 fixed to an auxiliary machine side rotating shaft (not shown), and a belt ( A pulley body 3 around which is wound), a ball bearing 4 interposed between the outer peripheral surface of the hub 2 and the inner peripheral surface of the pulley body 3 and allowing relative rotation of both within a certain range; The rotation fluctuation absorbing member 5 accommodated in the hub 2 and the pulley body 3, the collar 6 press-fitted into the ball bearing 4, and a stopper plate 7 inserted on one end side of the hub 2 are configured.

  As shown in FIG. 4, the hub 2 has a cylindrical cylindrical press-fit portion 10 into which an accessory-side rotating shaft (not shown) is press-fitted, and a position 180 degrees opposite to the outer peripheral surface of the cylindrical press-fit portion 10. And two hub side rotation transmission projections 11 projecting from each other.

  As shown in FIG. 5, the pulley body 3 protrudes to a position opposite to the cylindrical rim portion 12 around which a belt (not shown) is wound, and an inner peripheral surface of the rim portion 12 at an angle of 180 degrees. And two main-body-side rotation transmission protrusions 13. The two hub side rotation transmission protrusions 11 of the hub 2 and the two main body side rotation transmission protrusions 13 of the pulley body 3 are arranged on the same circumference, and their rotational positions are shifted by 90 degrees respectively. Has been placed. Then, four rotation fluctuation absorbing spaces 15 are formed by the adjacent hub side rotation transmission protrusion 11 and main body side rotation transmission protrusion 13.

  The rotation fluctuation absorbing member 5 is formed of a first elastic body 16 formed of an elastic material such as a rubber material, a pair of leaf spring members 17 formed of a leaf spring material, and an elastic material such as a rubber material. The second elastic body 18 is configured.

  As shown in FIG. 5, the first elastic body 16 has a frame shape along the inner peripheral surface of the pulley main body 3, and is lap-bonded to the inner peripheral surface of the pulley main body 3. In the first elastic body 16, the portions arranged between the hub side rotation transmission projection 11 and the main body side rotation transmission projection 13 are arranged in the respective rotation fluctuation absorbing spaces 15.

  As shown in FIG. 6, each leaf spring member 17 includes a connecting portion 17a extending substantially linearly, a first plate spring 17b extending in a curved shape from one end side of the connecting portion 17a, and a connecting portion 17a. And a second leaf spring 17c extending in a curved shape from the other end side. The first plate spring 17b and the second plate spring 17c are set to have different curved lengths and thereby have different spring constants. Thus, the first leaf springs 17b and the second leaf springs 17c having different spring constants are alternately arranged in the four rotation fluctuation absorbing spaces 15, and one of the rotation fluctuation directions (when the hub 2 is fixed) is arranged. In the direction of arrow a in FIG. 2, the first leaf spring 17 b receives a compressive force, and in the other rotational fluctuation direction (in the direction of arrow b in FIG. 2 when the hub 2 is fixed), the second leaf spring 17 c exerts a compressive force. To receive. Further, the spring member 17 is attached by fitting the portion of the connecting portion 17a with the hub-side rotation transmission protrusion 11.

  As shown in FIG. 6, each second elastic body 18 is energized over the entire area of the outer peripheral surface of the connecting portion 17a of the plate spring member 17 and a partial range of the first plate spring 17b and the second plate spring 17c. It is bonded by bonding. The portions of the second elastic bodies 18 bonded to the partial ranges of the first plate spring 17b and the second plate spring 17c are respectively disposed in the adjacent rotation fluctuation absorbing spaces 15.

  As described above, each of the four rotational fluctuation absorbing spaces 15 has an elastic body composed of one of the first plate spring 17b and the second plate spring 17c, and the first elastic body 16 and the second elastic body 18. Are arranged so as to be deformable together in the circumferential direction.

  Further, the first elastic body 16 and the second elastic body 18 have lower spring constants than the first and second leaf springs 17b and 17c, and are compressed and deformed when the input rotational torque is low. The first plate spring 17b and the second plate spring 17c have higher spring constants than the first and second elastic bodies 16 and 18 (the two spring constants themselves are different as described above), and the input rotational torque is high. It is set to compress and deform during torque.

  The stopper plate 7 has a disk shape, and a press-fitting hole 7a to be press-fitted into the cylindrical press-fitting portion 10 is formed at the center thereof.

  In the above configuration, when a moving force acts on a belt (not shown) by rotation of a driving pulley (not shown), the pulley body 3 of the auxiliary pulley 1A is rotated by frictional force with the belt (not shown). Power is transmitted. Then, each main body side rotation transmission protrusion 13 of the pulley main body 3 transmits the hub side rotation transmission of the hub 2 via the first elastic body 16, the second elastic body 18, and the first plate spring 17b (or the second plate spring 17c). The rotation is transmitted to the protrusion 11. The rotation of the hub 2 rotates an auxiliary machine side rotation shaft (not shown).

  In the rotation transmission process, if a rotation fluctuation occurs in the rotation on the driving side, a belt (not shown) changes the moving speed so as to follow the rotation fluctuation. On the other hand, since the auxiliary side tries to rotate at a constant rotation speed due to inertia, a fluctuation in tension occurs in a belt (not shown). However, if the pulley body 3 rotates, the first elastic body 16, the second elastic body 18, and the first leaf spring 17b (or the second leaf spring 17c) are deformed to absorb the rotation variation, and the hub. 2 to transmit the rotation.

  Here, at the time of low torque rotation, the first leaf spring 17b (or the second leaf spring 17c) having a high spring constant hardly deforms in the compression direction, but the first elastic body 16 and the second elastic body 18 having a low spring constant are Compressive deformation according to the input rotational torque. Therefore, if there is a fluctuation in rotation at low torque, the second elastic body 18 is sandwiched between the first leaf spring 17b and the connecting portion 17a (hub-side rotation transmission projection 11) and is compressed and deformed (only in the direction a). The elastic body 16 is pressed against the main body side rotation transmission protrusion 13 and the first plate spring 17b or the second plate spring 17c and compressively deforms to absorb the rotational fluctuation. Furthermore, if the second leaf spring 17c has the same shape as the first leaf spring 17b, the second elastic body 18 is sandwiched between the second leaf spring 17c and the connecting portion 17a and can be compressed and deformed. Further, at the time of high torque, the first elastic body 16 and the second elastic body 18 having a low spring constant are in a maximum compression deformation state and do not compress and deform, but the first leaf spring 17b (or the second leaf spring 17c) having a high spring constant. Is deformed in the compression direction in accordance with the input rotational torque. Therefore, if there is a rotational fluctuation during high torque rotation, the first leaf spring 17b (or the second leaf spring 17c) is deformed in the compression direction and absorbs the rotational fluctuation. As described above, the auxiliary machine side pulley 1A can absorb the tension fluctuation of a belt (not shown) due to the rotational fluctuation on the driving side in various input modes (low torque, high torque), and the belt (not shown). )) Can be sufficiently improved.

  In the first embodiment, the first leaf spring 17b that receives a compressive force according to one rotational fluctuation direction and the second leaf spring 17c that receives a compressive force according to the other rotational fluctuation direction are configured to have different spring constants. Therefore, there may be a case where different rotational fluctuation absorption characteristics are required depending on the direction of the rotational fluctuation, and the auxiliary machine side pulley 1A suitable for such conditions can be provided. Further, the first plate spring 17b that receives the compressive force in one rotational fluctuation direction and the second plate spring 17c that receives the compressive force in the other rotational fluctuation direction may have the same spring constant. If comprised in this way, the same rotational fluctuation absorption characteristic may be required depending on the direction of rotational fluctuation, and an accessory side pulley suitable for such conditions can be provided.

  In the first embodiment, the two first plate springs 17b and the second plate springs 17c arranged in the adjacent rotation fluctuation absorbing spaces 15 are integrally formed by the connecting portion 17a. Since the first plate spring 17b and the second plate spring 17c can be assembled to the two rotation fluctuation absorbing spaces 15 simply by assembling the to the hub side rotation transmission protrusion 11, the assemblability is improved. Further, since the first plate spring 17b and the second plate spring 17c are connected to each other, it is possible to avoid as much as possible the situation where the first variation spring 15b falls off from the rotation fluctuation absorbing space 15 or the proper arrangement posture is lost.

  In the first embodiment, each rotation fluctuation absorbing member 5 has a first elastic body 16 bonded to the pulley body 3 and a second elastic body 18 bonded to each other, and a first plate spring 17b and a second plate spring 17c are connected to each other. Since the plate spring member 17 is integrally formed, if only the plate spring member 17 is disposed in the rotation fluctuation absorbing space 15, the second elastic body 18 is assembled, so that the assembly performance is further improved. .

  In the conventional example, since the metal bearing is interposed between the hub and the pulley body, the change in the frictional resistance between the pulley body and the metal bearing becomes larger due to variations in input conditions and dimensions, and the required tension fluctuation Absorption could not be performed sufficiently. On the other hand, in the first embodiment, since the ball bearing 4 is interposed between the hub 2 and the pulley body 3, the above-described problems do not occur and the necessary tension fluctuation is sufficiently absorbed. be able to.

(Second Embodiment)
FIGS. 7 to 11 show a second embodiment of the present invention, FIG. 7 is a sectional view of the auxiliary pulley 1B, FIG. 8 is a sectional view taken along the line BB of FIG. 7, and FIG. FIG. 10 is a front view of the pulley body 3, and FIG. 11 is a front view of the pair of leaf spring members 22 and the second elastic body 23.

  As shown in FIGS. 7 to 11, the auxiliary pulley 1 </ b> B, which is a pulley, is the same as that of the first embodiment except for the rotation fluctuation absorbing member 20. Reference numerals are assigned and explanations thereof are omitted. Hereinafter, the rotation fluctuation absorbing member 20 having a different configuration will be described.

  The rotational fluctuation absorbing member 20 has the same components as in the first embodiment, and includes a first elastic body 21 formed of an elastic material such as a rubber material and a pair of plates formed of a leaf spring material. It is comprised from the spring member 22 and the 2nd elastic body 23 formed from elastic materials, such as a rubber material.

  As shown in FIG. 9, the first elastic body 21 has a frame shape along the outer peripheral surface of the hub 2, and is bonded to the outer peripheral surface of the hub 2 by vortex. As for the 1st elastic body 21, the location arrange | positioned between each of the hub side rotation transmission protrusion 11 and the main body side rotation transmission protrusion 13 is each arrange | positioned in each rotation fluctuation absorption space 15. FIG.

  As shown in FIG. 11, each leaf spring member 22 includes a connecting portion 22a extending substantially linearly, a first leaf spring 22b extending in a curved shape from one end of the connecting portion 22a, and a connecting portion 22a. And a second leaf spring 22c extending in a curved shape from the other end side. The first plate spring 22b and the second plate spring 22c are set to have different curved lengths and thereby have different spring constants. Thus, the first leaf springs 22b and the second leaf springs 22c having different spring constants are alternately arranged in the four rotation fluctuation absorbing spaces 15, and one of the rotation fluctuation directions (when the hub 2 is fixed) is arranged. In the direction of arrow a in FIG. 7, the first leaf spring 22 b receives a compression force, and in the other direction of fluctuation in rotation (in the direction of arrow b in FIG. 7 when the hub 2 is fixed), the second leaf spring 22 c exerts a compression force. To receive.

  As shown in FIG. 11, each second elastic body 23 is bonded to the entire area of the inner peripheral surface of the connecting portion 22 a of the leaf spring member 22 by flow bonding. Both end portions of the second elastic body 23 are bent to the first leaf spring 22b side and the second leaf spring 22c side without being applied and bonded. The portions of the second elastic body 23 bent toward the first leaf spring 22b side and the second leaf spring 22c side are respectively disposed in the adjacent rotation fluctuation absorbing spaces 15. As described above, each of the four rotational fluctuation absorbing spaces 15 has an elastic body composed of one of the first plate spring 22b and the second plate spring 22c, and the first elastic body 21 and the second elastic body 23. Are arranged so as to be deformable together in the circumferential direction.

  The first elastic body 21 and the second elastic body 23 have a lower spring constant than the first and second leaf springs 22b and 22c, and when the input rotational torque is low, as in the first embodiment. Compressive deformation. The first leaf spring 22b and the second leaf spring 22c have higher spring constants than the first and second elastic bodies 21 and 23 (both spring constants are different as described above), and the input rotational torque is high. It is set to compress and deform during torque.

  That is, in the first embodiment, the first elastic body 16 is vulcanized and bonded to the pulley body 3 side, but in the second embodiment, the first elastic body 21 is vulcanized and bonded to the hub 2 side. Is different. Along with this difference, some changes are made to the configuration of the leaf spring member 22 and the second elastic body 23.

  Therefore, also in the second embodiment, the rotation fluctuation can be absorbed by the same action as the first embodiment, and the belt (due to the rotation fluctuation on the driving side in various input modes (low torque, high torque)) The tension fluctuation of the belt (not shown) can be absorbed, and the durability of the belt (not shown) can be sufficiently improved.

  In the first and second embodiments, each rotational fluctuation absorbing space 15 is provided with two members, ie, first elastic bodies 16 and 21 and second elastic bodies 18 and 23 as elastic bodies. It may be a member. In the first and second embodiments, the first elastic bodies 16, 21 and the second elastic bodies 18, 23 may have the same spring constant or different values. If the value is set to a different value, the range of absorption of rotational fluctuation at low torque can be widened.

  In the first and second embodiments, the present invention is applied to the auxiliary pulleys 1A and 1B. However, the present invention needs to absorb fluctuations in the tension of a belt (not shown). Of course, it can be applied to all pulleys.

FIG. 2 is an exploded perspective view of the auxiliary pulley, showing the first embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of an accessory-side pulley according to a first embodiment of the present invention. FIG. 3 shows the first embodiment of the present invention and is a cross-sectional view taken along line AA in FIG. 2. 1 is a front view of a hub according to a first embodiment of the present invention. It is a front view of a pulley main part and the 1st elastic body which shows a 1st embodiment of the present invention. FIG. 2 is a front view of the pair of leaf spring members and the second elastic body according to the first embodiment of the present invention. It is sectional drawing of the auxiliary machine side pulley which shows 2nd Embodiment of this invention. FIG. 8 shows a second embodiment of the present invention and is a cross-sectional view taken along line BB in FIG. 7. It is a front view of a hub and the 1st elastic body which shows a 2nd embodiment of the present invention. It is a front view of a pulley main part, showing a 2nd embodiment of the present invention. FIG. 5 is a front view of a pair of leaf spring members and a second elastic body according to the second embodiment of the present invention. It is a disassembled perspective view of the auxiliary machine side pulley of a prior art example. It is sectional drawing of the auxiliary machine side pulley of a prior art example.

Explanation of symbols

1A, 1B Auxiliary machine side pulley (pulley)
2 Hub 3 Pulley body 5 Rotation fluctuation absorbing member 11 Hub side rotation transmission protrusion 13 Body side rotation transmission protrusion 16 First elastic body (elastic body)
17 Leaf spring member 17a Connecting portion (leaf spring)
17b First leaf spring (leaf spring)
17c Second leaf spring (leaf spring)
18 Second elastic body (elastic body)
20 rotational fluctuation absorbing member 21 first elastic body (elastic body)
22 Leaf spring member 22a Connecting portion (leaf spring)
22b First leaf spring (leaf spring)
22c Second leaf spring (leaf spring)
23 Second elastic body (elastic body)

Claims (5)

A hub fixed to the rotation shaft and having a hub-side rotation transmission projection;
A pulley body that is rotatably provided on the outer periphery of the hub and has a body-side rotation transmission protrusion,
A rotation fluctuation absorbing member disposed in a plurality of rotation fluctuation absorbing spaces formed between the hub side rotation transmission protrusion and the main body side rotation transmission protrusion;
In the pulley in which the rotation between the pulley body and the hub is transmitted via the rotation fluctuation absorbing member,
Each of the rotation fluctuation absorbing members is composed of an elastic body and a leaf spring member that are arranged so as to be deformable together in the circumferential direction. The pulley according to claim 1,
The leaf spring member has a first leaf spring and a second leaf spring,
A pulley characterized in that the first leaf spring that receives a compressive force according to one rotational fluctuation direction and the second leaf spring that receives a compressive force according to the other rotational fluctuation direction have different spring constants. The pulley according to claim 1,
The leaf spring member has a first leaf spring and a second leaf spring,
A pulley having the same spring constant as the first leaf spring that receives a compressive force in one rotational fluctuation direction and the second leaf spring that receives a compressive force in the other rotational fluctuation direction. The pulley according to any one of claims 1 to 3,
The pulley, wherein the first leaf spring and the second leaf spring, which are the leaf spring members respectively disposed in the adjacent rotation fluctuation absorbing spaces, are integrally formed by a connecting portion. The pulley according to claim 4, wherein
The elastic body includes a first elastic body fixed to one of the hub and the pulley body, and a second elastic body fixed to a leaf spring member integrally formed with the first and second leaf springs. A pulley characterized by comprising:

Images