JP2005299695A - Power transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To cover the inside of a driving body in a power transmission device to improve the appearance and attach a cover body simply. <P>SOLUTION: This power transmission device has a driven body 10 fixed on a rotatable driven shaft 7 by a screw and the cover body 41 covering an outer peripheral side of the driven body 10, connects the driven body 10 with a driving body 4 to transmit driving force, and shuts off transmission of driving force when load torque of the driven body 10 exceeds a predetermined value. The driven body 10 has a rotation regulation part 45 regulating relative rotation with the driven shaft 7 when fixing it to the driven shaft 7 by a screw, and the cover body 41 is fixed to the rotation regulation part 45. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a power transmission device that transmits a driving force of a driving body to a driven body.

  When a driven body and a drive body that drives the driven body are connected to the compressor of the vehicle air conditioner to transmit the driving force, and the load torque to the driven body exceeds a predetermined value A power transmission device for interrupting transmission of driving force is incorporated.

  FIG. 4 is a cross-sectional view of a conventional power transmission device described in JP-A-2002-54711. A boss portion 102 is formed in the housing 101 of the compressor, and a pulley 104 as a driving body is rotatably supported by the boss portion 102 via a bearing 103. A belt (not shown) from the crankshaft of the engine is stretched around the pulley 104, and the pulley 104 is driven to rotate by driving the engine.

  The housing 101 is provided with a rotation shaft 105 protruding outward from the boss portion 102 so as to be coaxial with the boss portion 102. An output disk 106 as a driven body is fixed to the rotating shaft 105. The output disk 106 includes an outer hub 107 disposed on the outer peripheral side and an inner hub 108 coupled to the rotating shaft 105.

  A plurality of holes 104a are formed in the pulley 104 at a plurality of locations in the circumferential direction, and rubber dampers 109 are fitted into the holes 104a. A pin 110 is inserted into the rubber damper 109, and the driving force of the pulley 104 is transmitted to the outer hub 107 by engaging the pin 110 with the outer hub 107.

  The inner hub 108 includes an outer ring 108a inserted into the outer hub 107, an inner ring 108b that is screwed to the rotary shaft 105, and a bridge 108c that connects the outer ring 108a and the inner ring 108b. The bridge 108c is formed with a damaged portion 111 that is preferentially damaged when an overload overload torque is applied.

  In such a structure, when the engine is driven, the pulley 104 rotates and power is transmitted to the rotating shaft 105 via the rubber damper 109, the pin 110, the outer hub 107, and the inner hub 108.

When an abnormality such as burn-in occurs in the compressor, the rotary shaft 105 is locked, and the pulley 104 continues to rotate while the output disk 106 stops rotating, so the load torque exceeds a predetermined value. In this case, the damaged portion 111 of the inner hub 108 breaks preferentially and breaks. As a result, the inner hub 108 and the outer hub 107 are separated from each other and the transmission of power from the pulley 104 to the rotating shaft 105 is cut off, so that the pulley 104 rotates idle.
JP 2002-54711 A

  In the power transmission device having the structure shown in FIG. 4, since the shaft end portion of the pulley 104 is in an open state, the outer hub 107, the inner hub 108, and the rubber damper 109 are visible from the outside, and the appearance is deteriorated and dangerous. ing. In addition, when foreign matter such as pebbles or sand enters the pulley 104 from the inside of the vehicle body, it is blown off by the output disk 106 rotating in the pulley 104, and noise and noise are generated. doing.

  Therefore, it is conceivable that the cover body is provided at the shaft end portion of the pulley 104. However, when the cover body is provided at the shaft end portion of the pulley 104, the cover body is attached to the outer peripheral portion of the outer hub 107 or the pulley 104. The cover body cannot be easily attached.

  Therefore, an object of the present invention is to provide a power transmission device that has a structure in which the inside of a pulley is closed by a cover body, and that can be easily attached.

  In order to achieve the above object, the invention of claim 1 includes a driven body screwed and fixed to a rotatable driven shaft, and a cover body covering an outer peripheral side of the driven body, and the driven A power transmission device that connects a driving body that drives a body to transmit a driving force, and that interrupts transmission of the driving force when a load torque to the driven body exceeds a predetermined value, The driven body has a rotation restricting portion that restricts relative rotation with the driven shaft when the screw is fixed to the driven shaft, and the cover body is fixed to the rotation restricting portion. And

  In this power transmission device, the cover body can be easily attached by fixing the cover body to the rotation restricting portion used when the driven body is screwed and fixed to the driven shaft, and the inside of the pulley is closed. It can be a structure.

  The invention according to claim 2 is the power transmission device according to claim 1, wherein the rotation restricting portion is provided on the driven body and a fixing member is inserted when the screw is fixed to the driven shaft. It comprises a hole for restricting the rotation of the drive body, and the cover body has a protrusion inserted into and engaged with the hole.

  In this power transmission device, the cover body can be easily attached with one touch by inserting and engaging the projection of the cover body into the hole provided in the driven body. Further, when it is necessary to remove the cover body for maintenance, the cover body can be easily removed. Furthermore, it is not necessary to process the pulley for attaching the cover body.

  A third aspect of the present invention is the power transmission device according to the first aspect, wherein the rotation restricting portion is provided in the driven body and a fixing member is inserted when the screw is fixed to the driven shaft. It comprises a hole for restricting rotation of the driving body, and the cover body is fixed to the hole by screwing.

  In this power transmission device, the cover body can be firmly fixed to the driven body by screwing and fixing the cover body to the hole provided in the driven body. In this case, since the hole of the driven body uses a hole for restricting rotation when the driven body is fixed to the driven shaft, the processing for attaching the cover body is performed by a pulley or a driven body. There is no need to apply.

  According to the first aspect of the present invention, since the driven body is covered by the cover body, the inside of the driving body is not seen, the appearance is improved, and safety is ensured. It does not enter, and noise and noise caused by foreign matter are not generated. In the first aspect of the invention, since the rotation restricting portion used when the driven body is screwed and fixed to the driven shaft is used, it is not necessary to perform processing for attaching the cover body.

  According to the invention of claim 2, the cover body can be easily attached with one touch by inserting and engaging the projection of the cover body into the hole provided in the driven body. Further, when it is necessary to remove the cover body for maintenance, the cover body can be easily removed. Furthermore, it is not necessary to process the pulley for attaching the cover body.

  According to the invention of claim 3, the cover body can be firmly fixed to the driven body by screwing and fixing the cover body to the hole provided in the driven body. In this case, since the hole of the driven body uses a hole for restricting rotation when the driven body is fixed to the driven shaft, the processing for attaching the cover body is performed by a pulley or a driven body. There is no need to apply.

  FIG. 1 is an exploded perspective view of a power transmission device according to an embodiment of the present invention, FIG. 2 is a side view of a state where a cover body is removed, and FIG. 3 is a cross-sectional view taken along line AA of FIG.

  In these drawings, reference numeral 1 is a housing of a clutchless compressor, and a pulley 4 as a driving body is rotatably supported by a boss portion (see FIG. 3) 2 via a bearing (see FIG. 3) 3. ing. The housing 1 is coaxially arranged with respect to the boss portion 2 and accommodates a rotating shaft 7 protruding outward from the boss portion 2, and a driven body via a bolt 8 at the end thereof. A disk-shaped hub (driven body) 10 is fixed. Further, a cover body 41 is disposed on the outer peripheral side of the hub 10 to close the inside of the pulley 4.

  In the power transmission device of the present embodiment, the hub 10 has a rotation restricting portion 45 that restricts relative rotation with the driven shaft when the bolt 10 is fixed to the rotating shaft (drive shaft) 7 with the bolts 8. The cover body 41 is fixed to the rotation restricting portion 41. The rotation restricting portion 45 is provided in the hub 10 and includes four holes 47, 47, 47 for restricting the rotation of the hub 10 by inserting a fixing member (not shown) when screwing and fixing the rotating shaft 7. 47. The cover body 41 has four protrusions 49, 49, 49, 49 that are inserted into and engaged with the hole 47.

  The bearing 3 is held in a state in which an outer race is press-fitted into an insert fitting 9 provided inside the pulley 4 so as to be positioned around the rotary shaft 7.

  The hub 10 is configured by integrally forming a shaft portion 10a that is serrated with the rotary shaft 7 and a flange portion 10b that extends in a radial direction from the shaft portion 10a. The flange portion 10b includes a plurality of flange portions 10b. Fastening holes 11 are formed along the circumference. The fastening holes 11 are formed at four locations at equal intervals of 90 ° on the same circumference around the rotation shaft 7, and fastening pins 13 are fixed in a through state in the respective fastening holes 11. The penetrating end of the fastening pin 13 is connected to the other end 12c of the leaf spring 12 in an engaged state. The engagement of the fastening pin 13 with the leaf spring 12 is performed by caulking the penetrating end portion of the fastening pin 13 penetrating the leaf spring 12.

  The leaf spring 12 connects the pulley 4 as a driving body and the hub 10 as a driven body to transmit the rotational driving force of the pulley 4 to the hub 10, and the leaf driving force 12 is transmitted by the rotational driving force transmitted to the hub 10. The rotating shaft 7 rotates. Further, the leaf spring 12 acts so as to cut off the transmission of the driving force when the load torque to the hub 10 exceeds a predetermined value.

  Four leaf springs 12 are arranged so as to correspond to the fastening pins 13, and each leaf spring 12 has the same shape and size. As the leaf spring 12, a metal such as high carbon steel or bearing steel is used, and spring properties are imparted by forming the metal into a thin plate shape.

  The leaf spring 12 has a bifurcated shape in which one end of a pair of side pieces 12a having a distance 16 is connected to be openable and closable. A penetrating pin hole 14 that is rotatably engaged with the outer peripheral portion of the pin 13 is formed. The fastening pin 13 penetrates through the pin hole 14 and acts to connect the leaf spring 12 and the hub 10 by caulking the penetrating end portion. Further, a pin-like protrusion 22 of the transmission shaft 21 described later is inserted and held at the open end, which is one end 12b of the leaf spring 12, so that the protrusion 22 of the transmission shaft 21 can be freely engaged and disengaged. A mating holding surface 15 is formed.

  The transmission shaft 21 is a constituent member of the transmission member 20. The transmission member 20 has a circular ring-shaped location plate 23 as a transmission plate, and a transmission shaft 21 is attached to the location plate 23. In the location plate 23, insertion holes 24 penetrate in the thickness direction at four equal positions on the circumference around the rotation shaft 7, and the protrusions 22 of the transmission shaft 21 penetrate the respective insertion holes 24. doing. The penetrating end of the protrusion 22 is detachably held by the holding surface 15 of the leaf spring 12.

  The transmission shaft 21 has a protruding portion 22 on the leaf spring 12 side and a shaft plate 25 that is coaxial with the protruding portion 22 and integrally extends to the pulley 4 side. It extends so as to be parallel to. The shaft plate 25 has a flat shaft shape, and the shaft plate 25 is connected to the pulley 4 via the damper 30.

  As shown in FIG. 3, the transmission shaft 21 is formed with a fixing portion 27 whose outer surface is serrated. The fixing portion 27 is provided between the protruding portion 22 and the shaft plate 25 and is inserted into the insertion hole 24 formed in the location plate 23. Serrations that mesh with the serrations of the fixing portion 27 are formed on the inner peripheral surface of the insertion hole 24, and the transmission shaft 21 is coupled to the location plate 23 in a rotationally stopped state by meshing these serrations.

  As shown in FIG. 1, the damper 30 includes a pair of damper main bodies 31 and 32 formed in a substantially square columnar block shape, and a connecting band 33 that connects the pair of damper main bodies 31 and 32. The whole is formed of an elastic body such as rubber or soft resin. The connecting band 33 connects the damper main bodies 31 and 32 on one side in the height direction of the pair of damper main bodies 31 and 32. Further, in a connected state by the connecting band 33, an insertion space 34 in which the shaft plate 25 of the transmission shaft 21 is inserted is provided between the pair of damper main bodies 31 and 32.

  As shown in FIG. 1, groove portions 31 a and 32 a are formed in the damper main bodies 31 and 32, and when the driving force from the pulley 4 acts, the groove portions 31 a and 32 a are elastically compressed. It has become.

  The damper 30 is inserted and housed inside the pulley 4 to transmit the driving force of the pulley 4 to the transmission shaft 21. Inside the pulley 4, a plurality of rib portions 36 extending radially inward from the inner wall thereof are formed, and a step portion 37 protruding in a step shape between the rib portions 36 is formed. The damper 30 is inserted and stored in a storage space 38 surrounded by the rib portion 36 and the step portion 37. At the time of storage, it is inserted into the storage space 38 from the connecting band 33 side, and thereby the insertion space 34 is positioned on the transmission member 20 side.

  By inserting the shaft plate 25 into the insertion space 34 with respect to the damper 30 inserted into the storage space 38, the pulley 4 and the transmission member 20 are connected via the damper 30 and the transmission shaft 21. Then, the protrusion 22 of the transmission shaft 21 is fitted and engaged with the holding surface 15 of the leaf spring 12 attached to the hub 10 by the fastening pin 13. Thereby, the pulley 4 and the hub 10 are connected via the damper 30, the transmission member 20, and the leaf spring 12.

  As shown in FIG. 2, the leaf spring 12 is assembled so as to be substantially perpendicular to a straight line connecting the center of the rotating shaft and the pin 13 of the hub 10. In such assembling, the space for arranging the leaf springs 12 can be reduced, the size can be reduced, and the arm of the load torque to be transmitted can be lengthened.

  The holding surface 15 of the leaf spring 12 is formed with a curvature that matches the outer peripheral portion of the protruding portion 22 of the transmission shaft 21, so that the holding surface 15 can securely hold the protruding portion 22. It has become. On the other hand, when the protrusion 22 moves along the holding surface 15 toward the open end 12 b, the protrusion 22 can come out of the open end 12 b of the leaf spring 12. As a result, the connection between the leaf spring 12 and the transmission member 20 is released, and the leaf spring 12 is released from the connected state between the pulley 4 and the hub 10.

  In such a structure, when the load torque from the compressor side is a predetermined value or less, the driving force of the engine applied to the pulley 4 via a belt (not shown) is transmitted via the damper 30, the transmission member 20, and the pin 13. Is transmitted to the hub 10 and the rotary shaft 7 rotates. A damper 30 made of an elastic member is disposed in the driving force transmission path, and the damper 30 absorbs or attenuates shocks, unnecessary vibrations, and the like, so that only the driving force of the pulley 4 is transmitted to the hub 10 and the rotating shaft 7. The rotating shaft 7 can rotate smoothly. Further, the damper 30 is inserted into the storage space 38 partitioned by the rib portion 36, and when the driving force is transmitted, the damper 30 is compressed in the storage space 38, so that the driving force is reliably transmitted to the transmission member 20. Can communicate.

  When seizure or the like occurs inside the compressor and the load torque exceeds a predetermined value, the protrusion 22 held on the holding surface 15 of the leaf spring 12 is detached from the open end 12b. As a result, transmission of power from the pulley 4 to the rotating shaft 7 is interrupted, so that the pulley 4 idles. In such a structure in which the leaf spring 12 is detached from the connected state, the leaf spring 12 does not break. For this reason, it is not necessary to replace the leaf spring 12, the transmission member 20, and the like, and reassembly can be easily performed.

  In addition to the above, in this embodiment, the cover body 41 is assembled to the hub 10. As shown in FIG. 1, the cover body 41 has a disk shape that is slightly larger than the flange portion 10 b of the hub 10, substantially the same diameter as the outer diameter of the location plate 23, and smaller than the inner diameter of the pulley 4. A bolt hole 43 through which a bolt 8 screwed to the rotating shaft 7 passes is formed in the center portion. The cover body 41 is attached so as to be located outside the hub 10, whereby the inside of the pulley 4 is covered by the cover body 41.

  The cover body 41 has four protrusions 49, 49, 49 formed on the circumference on the back side. These protrusions 49, 49, 49, 49 are inserted into and engaged with the hole 47.

  The cover body 41 is attached by fixing the hub 10 to the rotary shaft 7 with the bolt 8 after the location plate 21 is assembled inside the pulley 4. At this time, a fixing member such as a jig is inserted into the holes 47, 47, 47, 47, and the bolt 8 is tightened in a state where relative rotation between the hub 10 and the rotating shaft 7 is restricted.

  Next, the protrusion 49 of the cover body 41 is inserted into and engaged with the hole 47 to fix the cover body 41 to the hub 10. Thereby, the cover body 41 can be easily assembled by one touch.

  Thus, when the cover body 41 is provided outside the hub 10, the hub 10 is covered by the cover body 41, so that the inside of the pulley 4 is not seen, the appearance is improved, and safety is achieved. In addition, foreign matter such as pebbles and sand does not enter the pulley 4, and noise and noise caused by the foreign matter are not generated. Furthermore, in this embodiment, since the cover body 41 can be assembled using the hole 47 as a rotation restricting portion when the hub 10 and the rotary shaft 7 are fixed with screws, the cover body 41 is assembled. There is no need to apply the process.

  In the above embodiment, the protrusion 49 is provided on the back surface side of the cover body 41 and the protrusion 47 is inserted into and engaged with the hole 47. However, the bolt that penetrates the cover body 41 is screwed into the cover body 41. It may be fixed by screwing.

  In the above embodiment, an example in which the hole 47 is used as the rotation restricting portion 45 is shown. However, as the rotation restricting portion, a protrusion protrudes from the hub 10, and this protrusion is inserted into and engaged with the cover body 41. Anyway.

It is a disassembled perspective view of the power transmission device in one Embodiment of this invention. It is a side view of the power transmission device in a state where a cover body is removed. It is the sectional view on the AA line of FIG. It is sectional drawing of the conventional power transmission device.

Explanation of symbols

1 Housing 3 Bearing
4 Pulley (Driver)
7 Rotating shaft 10 Hub (driven body)
12 Leaf spring 11 Fastening hole 13 Fastening pin 14 Pin hole 20 Transmission member 21 Transmission shaft 22 Projection portion 23 Location plate 25 Shaft plate 30 Damper 38 Storage space 41 Cover body 45 Rotation restricting portion 47 Hole portion 49 Projection

Claims (3)

A driven body (10) fixed by screwing to a rotatable driven shaft (7) and a cover body (41) covering the outer peripheral side of the driven body (10), the driven body ( Power that connects the driving body (4) that drives 10) to transmit the driving force, and that interrupts transmission of the driving force when the load torque to the driven body (10) exceeds a predetermined value A transmission device,
The driven body (10) has a rotation restricting portion (45) for restricting relative rotation with the driven shaft (7) when screwed to the driven shaft (7). (41) is being fixed to the said rotation control part (45), The power transmission device characterized by the above-mentioned. The power transmission device according to claim 1,
The rotation restricting portion (45) is provided in the driven body (10) and inserts a fixing member when the screw is fixed to the driven shaft (7) to restrict the rotation of the driven body (10). A power transmission device comprising a hole (47), wherein the cover body (41) has a protrusion (49) inserted into and engaged with the hole (47). The power transmission device according to claim 1,
The rotation restricting portion (45) is provided in the driven body (10) and inserts a fixing member when the screw is fixed to the driven shaft (7) to restrict the rotation of the driven body (10). A power transmission device comprising a hole (47), wherein the cover body (41) is screwed and fixed to the hole (47).

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