JP2006153147A - Power transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power transmission device capable of suppressing the drive load from varying at the time of intercepting the power transmission into a compressor, and smoothly transmitting the power when the load torque is not greater than a predetermined value. <P>SOLUTION: The power transmission device is provided with a location plate 9 connected to a pulley 4 and having a pin 6, a pin 11 installed in a hub 7, and a leaf spring shaped connecting member 12 to connect the pins 6, 11. Resin made ribs 15 to rotate the connecting member 12 in the axial direction are installed in the location plate 9 along the circumference of the location plate 9 by the number of connecting members 12. The connecting member 12 is a biforked shape formed by openably and closably connecting each one end of a pair of side pieces 25 with each other. The connection end side is rotatably engaged with the outer periphery of the pin 11, while the pin 6 on the opening end side is disengageable sandwiched in the direction opposite to the connection end side. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a power transmission device in a compressor.

  FIG. 12 is a sectional view showing a conventional example of this type of power transmission device, and FIG. 13 is an exploded perspective view of the power transmission device of FIG. In these drawings, reference numeral 101 denotes a housing of a clutchless compressor, and a pulley 104 is rotatably supported by a boss portion 102 via a bearing 103. The housing 101 accommodates a rotating shaft 105 that is coaxially disposed with respect to the boss portion 102 and protrudes outward from the boss portion 102, and a bolt 106 and a washer 107 are provided at the end thereof. The hub 108 is fixed.

  A disc-shaped cover member 110 is fixed to the hub 108 via a rivet 109, and a plurality of recesses 111 are arranged at a peripheral portion of the hub 108 at a predetermined angular interval on the same circumference around the rotation shaft 105. Formed. A cylindrical buffer rubber 112 is bonded and fixed in each recess 111, and at one end thereof, a hole for allowing the rolling ball 113 to roll is formed so as to partially protrude.

  In addition, holes 115 for accommodating the rolling balls 113 are formed on the same circumference on the surface of the pulley 104 facing the cover member 110, and each hole is provided on the same circumference. A hole 116 is formed for dropping the rolling ball 113 detached from 115.

  A belt (not shown) is wound around the outer periphery of the pulley 104, and this belt is connected to a crankshaft of an engine (not shown). When the engine is driven, the pulley 104 rotates, and power is transmitted to the rotating shaft 105 via the rolling ball 113, the buffer rubber 112, the cover member 110, and the hub 108.

In the conventional power transmission device configured as described above, when an abnormality such as seizure occurs inside the clutchless compressor and the load torque exceeds a predetermined value, each buffer rubber 112 is deformed and rotated. Each of the rolling balls 113 is released from the hole 115 by being pushed by the cover member 110 and enters the hole 116. As a result, transmission of power from the pulley 104 to the rotating shaft 105 is interrupted, and the pulley 104 is idled. In addition, what is described, for example in patent document 1 as such a prior art is proposed.
JP 2000-87850 A (paragraph numbers 0018 to 0027, FIG. 1)

  In the above prior art, when the load torque of the clutchless compressor exceeds a predetermined value, each buffer rubber 112 is deformed and detached from the rolling ball 113, and each rolling ball 113 is in the hole 115. Since the transmission of power to the compressor is cut off by entering into the other hole 116 from when the power transmission to the compressor is cut off due to wear or deterioration over time of the buffer rubber 112, etc. There is a problem that the load torque limit value is lowered, and therefore there is a difficulty in reliability as a power transmission device.

  The present invention has been made in consideration of the above-described prior art, and an object of the present invention is to suppress fluctuations in the driving load when power transmission to the compressor is interrupted, and the compressor load torque is predetermined. An object of the present invention is to provide a power transmission device capable of interrupting power transmission to a compressor when a value is exceeded.

  In order to achieve the above object, the present invention provides a first transmission member rotatably supported by a boss portion of a compressor housing, a coaxial member disposed with respect to the boss portion, and external to the boss portion. And a second transmission member fixed to the end of the rotating shaft that protrudes in the direction, the power is transmitted from the first transmission member to the second transmission member, and the load torque of the compressor is predetermined. A power transmission device that interrupts transmission of power when a value is exceeded, and is a cylindrical first protrusion that is coupled to the first transmission member and protrudes in the direction of the second transmission member A location plate having a cylindrical shape, a columnar second projection provided in the second transmission member and projecting in the direction of the first transmission member, and the first projection and the second projection connected to each other And a leaf spring-shaped connecting member, The plate is provided with resin rib portions for rotating the connecting member in the axial direction in the axial direction by at least the number of the connecting members along the circumferential direction of the location plate, and the connecting member is a pair of side pieces. One end of each of the two protrusions is connected to be openable and closable, and the connecting end side of the connecting portion is rotatably engaged with the outer peripheral portion of the second protrusion, and the open end side is connected to the first protrusion. It is configured so as to be detachable in a direction opposite to that.

  In the present invention configured as described above, the connection end side of the leaf spring-shaped connection member is connected to the second protrusion provided on the second transmission member, and the open end side sandwiches the first protrusion provided on the location plate. By doing so, a power transmission path of the first transmission member-location plate-first projection-connecting member-second projection-second transmission member is formed, so that power transmission to the compressor is performed. . Further, when the load torque of the compressor exceeds a predetermined value, the open end side of the connecting member is elastically deformed and separated from the first projection provided on the location plate, so that the power transmission path is disconnected and compressed. The power transmission state to the machine is released. Next, each resin rib provided on the location plate rotates the connecting member in the axial direction, so that the connecting member is kept away from the first protrusion. Thereby, it can prevent that metal parts of a connection member and a 1st protrusion collide repeatedly.

  As described above, in the power transmission device of the present invention, the leaf spring-like connection member is less likely to change with time and wear compared to the conventional case of using a cushion rubber, and the first protrusion is connected. Since the tip end portion of the open end is not worn by being held by the open end of the member, the force required for detachment of the first protrusion is unlikely to fluctuate. As a result, the problem that the load torque limit value when the power transmission to the compressor is cut off can be prevented, and the power transmission to the compressor is cut off when the load torque of the compressor exceeds a predetermined value. be able to. Therefore, power transmission to the compressor can be performed smoothly, and when an abnormality such as seizure occurs inside the compressor, engine stall due to excessive load on the engine can be prevented, so a highly reliable power transmission device There is an effect that can be provided. Further, when the connecting member is detached from the first protrusion, each resin rib portion rotates the connecting member in the axial direction and keeps it away from the first protrusion. Since it can prevent that the metal parts of a protrusion collide repeatedly, generation | occurrence | production of noise can be suppressed. Therefore, there is also an effect that it is possible to maintain a low noise state when the power transmission to the compressor is released.

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

  1 is a side view showing a power transmission device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the present embodiment, FIG. 3 is a cross-sectional view taken along line AA in FIG. 1, and FIG. FIG. 5 is an enlarged view showing a portion on the open end side of the connecting member provided in this embodiment, and FIG. 6 shows a state in which the open end side of the connecting member is expanded. FIG. 7 is a side view showing a state immediately after the open end side of the connecting member is detached from the first protrusion, and FIG. 8 is a side view showing a state where the open end side of the connecting member is further detached from the first protrusion. 9 is a side view showing a state in which the initial contact portion of the rib portion is in contact with the connecting member, FIG. 10 is a side view showing a state in which the final contact portion of the rib portion is in contact with the connecting member, and FIG. It is a side view which shows the state which the member rotated to the predetermined position toward the axial center direction. 4A is a cross-sectional view showing the configuration of the location plate, and FIG. 4B is a cross-sectional view showing a location axis portion provided on the location plate.

  In FIG. 3, reference numeral 1 denotes a housing of a clutchless compressor. The housing 1 accommodates a rotating shaft 5 that is disposed coaxially with the boss portion 2 and protrudes outward from the boss portion 2. A pulley 4 (first transmission member) is rotatably supported on the boss portion 2 via a bearing 3. A hub 7 (second transmission member) is fixed to the end of the rotating shaft 5 via a bolt 8. Although not shown, a belt connected to the crankshaft of the engine is wound around the outer periphery of the pulley 4. When the engine is driven, the pulley 4 rotates and power is transmitted.

  In this embodiment, a location plate 9 that similarly constitutes a drive body is attached to a pulley 4 that is a drive body in a connected state, and a constant angular interval is provided on the same circumference centered on the center point of the location plate 9. For example, a plurality of cylindrical pins 6 (first protrusions) are arranged at an angular interval of 120 °, and each pin 6 protrudes in the axial direction from the location plate 9 toward the hub 7. A plurality of pin insertion holes 10 are formed in the hub 7 at an angular interval of 120 ° on the same circumference with the rotation axis 5 as the center, and a cylindrical pin 11 (second protrusion) is formed here. ) Are fixed in a penetrating state, and each pin 11 protrudes in the axial direction from the hub 7 toward the location plate 9.

  As shown in FIG. 1, the pin 11 is connected to the pin 6 via a plurality of leaf spring-like connecting members 12 made of a spring material such as high carbon steel. Since the hub 7 which is a driving body is connected by a plurality of connecting members 12, the driving force (rotation) on the driving body side is transmitted to the driven body side. As shown in FIGS. 2 and 3, since the spring washer 14 is interposed between the flange 13 at one end of the pin 11 and the connecting member 12, the connecting member 12 is rotatable, and It is supported by pressing without rattling. The location plate 9 is provided with resin rib portions 15 corresponding to at least the number of the connecting members 12 along the circumferential direction, and the connecting members 12 are rotated in the axial direction by the rib portions 15. Yes.

  As shown in FIG. 2, a plurality of storage spaces 17 partitioned by a plurality of rib portions 16 extending radially inward in the radial direction are formed inside the pulley 4, and dampers 18 are provided in each storage space 17. It is stored. The damper 18 includes a pair of damper main bodies 19 formed in a block shape, and a connecting band 20 that connects the pair of damper main bodies 19 on one side of the damper main body 19, and the entirety is made of rubber, soft resin, or the like. The whole is formed of an elastic body. An insertion space 21 is formed between the pair of damper main bodies 19. When the damper 18 is stored, the connecting band 20 side is stored first, so that the insertion space 21 is positioned on the location plate 9 side.

  The location plate 9 is formed in a circular ring shape, and an insertion hole 22 into which the cylindrical pin 6 (first protrusion) is inserted is divided into three equal positions on the circumference around the rotation shaft 5. Is provided. As shown in FIGS. 2, 3, and 4 (a), a plurality of radially extending rib portions 23 are formed on the inner surface of the location plate 9, and each rib portion 23 is inserted into the insertion space 21 of the damper 18. By inserting, the location plate 9 is connected to the pulley 4 via the damper 18 and the rib portion 23, and the location plate 9 rotates integrally with the pulley 4. As shown in FIG. 4B, the location shafts 24 may protrude from the location plate 9 in the direction of the pulley 4 so that the location shafts 24 are held between the dampers 18.

  The connecting member 12 has a bifurcated shape in which one end of a pair of side pieces 25 is connected so as to be openable and closable, and has a through hole 26 that rotatably engages with the outer peripheral portion of the pin 11 on the connecting end side. . In addition, as shown in FIG. 5, in the plan view, each side piece 25 is formed on the inner surface on the open end side at intervals in the circumferential direction of the outer peripheral portion of the pin 6, and is a point contact with the outer peripheral portion of the pin 6 Parts 27 and 28, and a curved surface 29 that is formed between them and opposed to the outer peripheral portion of the pin 6 with a gap therebetween, and the pin 6 is sandwiched between the curved surfaces 29 in the radial direction. .

  The rib portion 15 includes an initial contact portion 30 that contacts the connecting member 12, a final contact portion 31 that protrudes in the axial direction from the initial contact portion 30, an initial contact portion 30, and a final contact portion 31. And a rotation guide portion 32 formed in an arc shape along the circumferential direction of the rib portion 15.

  In such an embodiment, when the pin 6 and the pin 11 are connected by the connecting member 12, each pin 11 passes through the through hole 26 on the connecting end side of the connecting member 12 and the pin insertion hole 10 of the hub 7. Then, the connecting end side of the connecting member 12 is connected to the hub 7 by crimping and fixing the tip to the hub 7. Next, the hub 7 is fixed so as not to rotate, and the pulley 4 is rotated in the direction of the arrow, so that each pin 6 is pressed into the gap between the side pieces 25 on the open end side of the connecting member 12. Thereby, each connecting member 12 is elastically deformed in the direction in which the side piece 25 is opened, and each pin 6 is pushed into the curved surface 29. Then, the side piece 25 is elastically restored and the pins 6 are held between the open ends of the connecting members 12. As a result, as shown in FIG. 1, the connecting member 12 is attached in a spanning manner between the pin 11 and the pin 6, so that the hub 7 is connected to the location plate 9 via the connecting member 12.

  In the state where the hub 7 is connected to the location plate 9 via the connecting member 12 as described above, when the load torque on the compressor side is a predetermined value or less, the engine given to the pulley 4 via a belt (not shown). Is transmitted to the hub 7 through the power transmission path of the pulley 4-damper 18-location plate 9-pin 6-connecting member 12-pin 11-hub 7, and is fixed to the hub 7 via the bolt 8. The rotation shaft 5 thus rotated rotates.

  Further, when seizure or the like occurs inside the compressor and the load torque exceeds a predetermined value, as shown in FIGS. 6, 7 and 8, the pin 6 held between the open ends of each connecting member 12. Pushes the side piece 25 of the connecting member 12 apart and separates from the connecting member 12. As a result, transmission of power from the pulley 4 to the rotary shaft 5 is interrupted, so that the pulley 4 and the location plate 9 idle.

  Next, as shown in FIG. 9, after the initial contact portion 30 of the rib portion 15 provided on the location plate 9 contacts the connecting member 12, the rotation guide portion 32 contacts the connecting member 12, as shown in FIG. When the final abutting portion 31 finally abuts, the connecting member 12 is gradually rotated to a predetermined position in the axial direction as shown in FIG.

  In the present embodiment configured as described above, the connecting member 12 formed of a leaf spring-like spring material is less likely to change with time and wear compared to the case of using a cushion rubber as in the prior art. Since the tip of the open end is not worn by pinching the open end of the connecting member 12, the force required for detaching the pin 6 is unlikely to fluctuate. Therefore, the problem that the load torque limit value when the power transmission to the compressor is interrupted can be prevented, and the power transmission to the compressor is interrupted when the load torque of the compressor exceeds a predetermined value. Can do. Further, since the connecting member 12 when the transmission of power to the compressor is interrupted is provided symmetrically around the rotation shaft 5 at equal angular intervals, it depends on variations in strength and dimensions of each connecting member 12. The influence is reduced, and fluctuations in the driving load when power transmission to the compressor is interrupted can be suppressed from this point as well.

  Further, in the present embodiment, when the connecting member 12 is detached from the pin 6, the resin rib portion 15 rotates each connecting member 12 in the axial direction and keeps it away from the pin 6. Since the generation of noise that occurs when the metal parts of the connecting member 12 and the pin 6 repeatedly collide with each other is prevented, it is possible to maintain a low noise state when the power transmission to the compressor is released. Furthermore, there is a concern that the repeated collision of the connecting member 12 and the pin 6 may cause damage to parts and a locked state of the rotating body (location plate 9 and pulley 4). By rotating and maintaining the state away from the pin 6, it is possible to prevent the parts from being damaged and the rotating body from being locked.

  In the present embodiment, the location plate 9 is provided with the rib portion 15 formed of the initial contact portion 30, the final contact portion 31 and the rotation guide portion 32 and formed in an arc shape, so that the rigidity of the location plate 9 is improved. Since the release torque is stabilized, a material having a low elastic modulus can be used for the location plate 9. For example, the location plate 9 and the rib portion 15 can be integrally formed using a low elastic modulus resin material.

  In the above-described embodiment, the initial contact portion 30, the rotation guide portion 32, and the final contact portion 31 of the rib portion 15 are sequentially in contact with the connecting member 12. However, the location plate 9 may be used as necessary. By changing the position of the rib portion 15 in the circumferential direction, the portion where the rib portion 15 abuts on the connecting member 12 can be reduced, and for example, only one location can be provided.

  The present invention can provide a highly reliable power transmission device and can maintain a low noise state when the power transmission to the compressor is released. Therefore, the clutchless provided in a vehicle air conditioner or the like is effective. In addition to being applicable as a compressor, it is also widely applicable as a compressor for general machinery or industrial machinery.

It is a side view which shows the power transmission device which concerns on one Embodiment of this invention. It is a disassembled perspective view of this embodiment. It is the sectional view on the AA line of FIG. It is sectional drawing explaining the location plate provided in this embodiment. It is a figure which expands and shows the part by the side of the open end of the connection member provided in this embodiment. It is a side view which shows the state by which the open end side of the connection member was pushed and expanded. FIG. 6 is a side view showing a state immediately after the open end side of the connecting member is detached from the second protrusion. It is a side view which shows the state which the open end side of the connection member further separated from the 2nd protrusion. It is a side view which shows the state which the initial contact part of the rib part contact | abutted to the connection member. It is a side view which shows the state which the last contact part of the rib part contact | abutted to the connection member. It is a side view which shows the state which the connection member rotated to the predetermined position toward the axial direction. It is sectional drawing which shows the prior art example of a power transmission device. It is a disassembled perspective view which shows the prior art example of a power transmission device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 2 Boss part 4 Pulley (1st power transmission member)
5 Rotating shaft 6 Pin (first protrusion)
7 Hub (second transmission member)
9 Location plate 11 Pin (2nd protrusion)
12 connecting member 15 rib part 25 side piece 30 initial contact part 31 final contact part 32 rotation guide part

Claims (3)

A first transmission member (4) rotatably supported by a boss part (2) of a housing (1) of the compressor, and the boss part (4) arranged coaxially with the boss part (2) 2) and a second transmission member (7) fixed to the end of the rotating shaft (5) protruding outward from the first transmission member (4) to the second transmission member ( 7) a power transmission device that transmits power to 7) and interrupts power transmission when a load torque of the compressor exceeds a predetermined value;
A location plate (9) connected to the first transmission member (4) and having a cylindrical first protrusion (6) protruding in the direction of the second transmission member (7); A cylindrical second protrusion (11) provided on the transmission member (7) and protruding in the direction of the first transmission member (4), the first protrusion (6), and the second protrusion ( 11) and a leaf rib-like connecting member (12) for connecting the connecting member (12) to the location plate (9) and rotating the connecting member (12) in the axial direction. ) Is provided in the circumferential direction of the location plate (9) by at least the number of the connecting members (12),
The connecting member (12) has a bifurcated shape in which one ends of a pair of side pieces (25) are connected so as to be openable and closable, and the connecting end side is freely rotatable on the outer periphery of the second protrusion (11). The power transmission device is characterized in that the first end (6) is detachably held in the direction opposite to the connecting end side while the open end side is engaged with the first end (6).   The rib portion (15) includes an initial contact portion (30) that contacts the connection member (12) and a final contact portion (31) that protrudes in the axial direction from the initial contact portion (30). The power transmission device according to claim 1, wherein the power transmission device is provided. The power transmission device according to claim 2, wherein a rotation guide portion (32) formed in an arc shape is provided between the initial contact portion (30) and the final contact portion (31).

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