JP2006214537A - Power transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the positions of bearings from being displaced even if a load is applied to a pulley from the outside in a power transmission device. <P>SOLUTION: This power transmission device for transmitting a rotatingly driving force from a drive device such as an engine to a driven device such as a compressor comprises the pulley to which a belt transmitting the rotatingly driving force is installed, a hub connecting the pulley to the rotating shaft of the driven device, the bearings rotatably pivoting the pulley, and a ring fixedly fitted to the pulley and allowing the bearings to be unmovably installed on the pulley. The ring comprises, at a first end part on the opposite side of the drive device, a bent part acting so that the bearings come into contact with the ring and are not moved further. Rings are formed on the driven device side of the bearings, and the second end part of the ring on the opposite side of the first end part is caulked to fix the bearings to the ring through the rings. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a power transmission mechanism, and more particularly to a power transmission device having a function of a torque limiter, which is suitable for being used in a compressor for a vehicle.

  A vehicle air conditioner, a so-called car air conditioner refrigerant compressor, is driven from an external power source such as an engine via a belt, a pulley, or the like. In this case, an electromagnetic clutch may be inserted between them to disconnect the engine and the compressor. However, if the electromagnetic clutch is not inserted, the cost is reduced and there is a merit, so the electromagnetic clutch is often omitted. In this case, a torque limiter is provided in the power transmission mechanism for the reason that a failure on the compressor side does not affect the engine side.

  FIG. 6 shows a conventional example of a power transmission device with a torque limiter used in a car air conditioner. FIG. 7 shows an enlarged view of the ring portion of such a power transmission device 50. In the structure shown in FIG. 6, a metal ring 5 that is insert-molded on the resin pulley 1 is provided with a bent portion 5 b in which a rear portion (right side in the drawing) of the ring 5 is bent inward. The bearing 7 is inserted into the ring 5 from the front (left side in FIG. 6) of the ring 5 until it contacts the bent portion 5b. Furthermore, the bearing 7 is assembled | attached to the ring 5 by crimping the crimping part 5a ahead of the ring 5 shown in FIG. In this way, the bearing 7 is attached to the pulley 1. However, in this structure, when a load is applied in the forward direction of the pulley from the outside, the portion that receives the load becomes the crimping portion 5a, so that the crimping strength is not secured and the crimping 5a is loosened. The position of the ring 5, that is, the pulley 1 is shifted, which causes problems such as damage to the bearing.

In a conventional power transmission device that transmits power to a compressor of a car air conditioner, a metal ring for inserting a bearing installed on the inner periphery of a resin pulley is provided (see, for example, Patent Document 1). This ring has the effect of dissipating heat generated in the bearing portion generated by the rotation of the resin pulley, but the ring shape of Patent Document 1 is inserted from the front of the ring insert-molded into the resin pulley, The front end of the ring was swaged.
With this structure, as in the conventional example shown in FIG. 6, when external force acts on the pulley, the pulley is subjected to a load on the rear side, so that the caulking portion of the ring is loosened and the installation position of the bearing is shifted. There was a problem.

JP 2001-227620

  The present invention was made in view of the above-mentioned circumstances, and the conventional ring was manufactured by bending the rear, and the bearing was installed by crimping the front end of the ring after inserting the bearing. In this proposal, the shape of the ring is changed, the front of the ring is bent, the bearing is mounted from the rear of the ring, and an annular part is mounted from the rear of the ring to be caulked. An object of the present invention is to provide a power transmission device that can solve the problem that the position of the bearing shifts even when a load is applied to the pulley from the outside.

  According to the first aspect of the present invention, in order to achieve the above-described object, the power transmission device (20) for transmitting the rotational driving force from the driving device such as the engine to the driven device such as the compressor, A pulley (1) to which a belt for transmitting rotational driving force is mounted, a hub (2) for connecting the pulley (1) to a rotating shaft (4) of a driven device, and the pulley (1) can be rotated. A bearing (7) to be supported, and a ring (5) which is fitted and fixed to the pulley (1) and attaches the bearing (7) so as not to move relative to the pulley (1). To do. The ring (5) has a bent portion (5b) acting so that the bearing (7) abuts on the ring (5) and does not move any further, and a first bent portion (5b) opposite to the driven device side. The bearing (7) is mounted on the second end (5a) of the ring opposite to the first end by carrying out processing such as deformation, joining, and crimping. It is fixed to the ring (5).

  By constructing in this way, the first end (front side) opposite to the driven device side of the ring is bent and manufactured, and the bearing is connected to the second end side (the driven device side of the ring) ( Since the structure is mounted from the rear and the second end of the ring is crimped, this structure can solve the problem that the position of the bearing shifts even when a load is applied to the pulley from the outside.

According to a second aspect of the present invention, in the first aspect, the power transmission device further includes a ring (6), and the ring (5) accommodates the bearing (7) therein. To do. The said ring (6) is installed inside the said ring (5), and is installed so that it may contact | abut to the said bearing (7) by the side of a to-be-driven device.
According to this embodiment, by providing the ring, the bearing can be more easily fixed to the ring by various methods.

According to a third aspect of the present invention, in the second aspect, the ring (6) has a circular ring shape such as a square, rectangular, circular, elliptical, or U-shaped cross section. And
According to this form, a more specific form is disclosed about a ring.

According to a fourth aspect of the present invention, the bearing (7) according to any one of the first to third aspects is formed by caulking the second end (5a) of the ring (5). ) Is fixed to the ring (5).
According to the present embodiment, the method for fixing the bearing to the ring is more specific.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the bent portion (5b) is formed separately from the ring (5). The power transmission device according to any one of claims 1 to 4.
According to this embodiment, the ring and the bent portion are formed separately, and they can be formed in a simpler shape, so that the ring can be easily processed.

According to a sixth aspect of the present invention, according to any one of the first to fifth aspects, further comprising a torque limiter (3). The power transmission device described.
According to this embodiment, the configuration of the present invention is further embodied.

According to a seventh aspect of the present invention, in any one of the first to sixth aspects, the present invention is used in a vehicle air conditioner.
According to this embodiment, the application of the present invention is further embodied.

Hereinafter, a power transmission device according to a preferred embodiment of the present invention will be described in detail with reference to the drawings. The power transmission device described in the embodiment of the present invention is used for a car air conditioner that is driven from an external power source such as an engine via a belt or the like, and always has no electromagnetic clutch mechanism. Power is transmitted to the operation type refrigerant compressor. In the case of a car air conditioner that does not have an electromagnetic clutch, a torque limiter is usually installed in the power transmission system.
1 and 2 schematically show a first embodiment of a power transmission device according to the present invention, and FIG. 1 is a side sectional view of an upper half of a power transmission device 20 according to the first embodiment. FIG. 2 is a partially enlarged cross-sectional view of the vicinity of the ring of the power transmission device 20 of FIG. Elements of FIGS. 1 and 2 that are the same as or similar to those of the prior art of FIGS. 6 and 7 described above are designated by the same reference numerals.

  The configuration of the power transmission device 20 shown in FIG. 1 will be described below. The power transmission device 20 transmits power from the outside such as an engine via a belt (not shown), and further transmits it to a compressor (not shown). The power transmission device 20 acts to connect the pulley 1 to which the belt is mounted, the hub 2 for connecting the pulley 1 to the rotating shaft 4 of the compressor, and also to connect the pulley 1 to the rotating shaft 4 and It includes a torque limiter 3 that disconnects the connection and protects the drive device when excessive torque is transmitted, and a bearing 7 that rotatably supports the pulley 1. In the present embodiment, the pulley 1 is preferably made of resin.

The hub 2 includes an inner thick cylindrical inner hub 2e, an outer plate-shaped cylindrical outer hub 2c, and an elastic portion 2d connecting the inner hub 2a and the outer hub 2c. The elastic portion 2d is formed of an elastic material such as resin or rubber. In the hub 2, the inner hub 2a and the elastic portion 2d are joined, and the elastic portion 2d and the outer hub 2c are joined, and these are integrally formed. As shown in FIG. 1, the outer hub 2 c and the surrounding elastic portion 2 d have a shape protruding in a cylindrical shape, and are inserted into a space formed by the uneven portion 1 a and the pocket portion 1 c of the pulley 1. An uneven portion 2b having an uneven shape is formed on the outer periphery of the hub 2, that is, the outer periphery of the elastic portion 2d, and is fitted to the uneven shape of the uneven portion 1a of the pulley 1. Further, the uneven surface 2b of the hub 2 and the surface of the uneven surface 1a of the pulley 1 are welded and joined, and the pulley 1 and the hub 2 are firmly joined.
In the present invention, the joining of the pulley 1 and the hub 2 is not limited to the above-described form. For example, the joining of the inner face of the flat pulley 1 and the outer peripheral face of the flat hub 2 may be performed in other forms. There may be.

On the other hand, the torque limiter 3 has a cylindrical shape composed of a large outer diameter portion and a small outer diameter portion so as to correspond to the inner hub 2e of the hub 2, and a step-shaped step is fitted on the outer peripheral surface thereof. A portion 3 a is formed and is fitted to the fitting portion 2 g of the hub 2. A female screw portion 3c is engraved on the substantially entire inner peripheral surface of the small outer diameter portion. An annular notch 3b is formed in the vicinity of the end of the female screw portion 3c on the inner surface side of the torque limiter 3 so that it can be easily broken when it receives an excessive axial force. .
The rotating shaft 4 of the compressor is provided with an assembling tool shape 4b at a tip portion where the male screw portion 4a is formed. Further, as shown in FIG. 1, an O-ring 15 is attached and sealed in the gap between the torque limiter 3 and the rotary shaft in the vicinity of the front end side of the male screw portion 4a of the rotary shaft 4.

  The hub 2, the torque limiter 3, and the rotating shaft 4 having the above-described structure are combined as follows. That is, the fitting portion 3a of the torque limiter 3 becomes the fitting portion 2g of the hub 2 by screw-fitting the female screw portion 3c of the small outer diameter portion of the torque limiter 3 and the male screw portion 4a of the rotating shaft 4. The torque limiter 3 is inserted into the hub 2 so as to abut. By further screwing the torque limiter 3 into the rotating shaft 4, the torque limiter 3 presses the hub 2 against the compressor casing, so that the rotating shaft 4 and the hub 2 or the pulley 1 are fixedly coupled.

The pulley 1 (that is, the power transmission device 20) is connected to the rotating shaft 4 of the compressor as described above, and is rotatably supported via the bearing 7 by the boss portion 9a that is a part of the casing 9 of the compressor. Is done. As shown in FIG. 1, the bearing 7 is fitted into a stepped boss portion 9 a and the inner ring is fixed to the boss portion 9 a by a washer 8 so as not to move.
The configuration of the components of the power transmission device 20 such as the pulley 1, the hub 2, the torque limiter 3 and the like and the form of assembly of these components are merely examples, and the present invention is not limited thereto, and these are not limited to those skilled in the art. Various configurations or forms known in the art may be used.

  Next, the joining of the outer ring side of the bearing 7 and the pulley 1 will be described. The features of the present invention reside in this part. FIG. 1 is a diagram showing a representative example. The metal ring 5 insert-molded in the resin pulley 1 is formed by bending the front (left side as viewed in the figure) of the pulley 1 inward. A bearing 7 is attached to the ring 5 from the rear side of the ring 5. A ring 6 having a square or rectangular cross section is further inserted into the ring 5 fitted with the bearing 7 from the rear side, and the rear end portion (crimping portion 5a) of the ring 5 is crimped, whereby the ring 5 and the bearing 7 are assembled. It is done. Since the ring 6 is present, the bearing 7 is not damaged even if the ring 5 is caulked.

  FIG. 2 shows an enlarged view of the ring portion of FIG. The ring 5 insert-molded on the resin pulley 1 has a bent portion 5b bent inward, an insertion portion 5c of the ring 6, and a crimped portion 5a that is crimped after the ring 6 is attached. The bearing 7 is mounted from the rear of the ring 5, is inserted up to the bent portion 5 b, is mounted with the ring 6, and is assembled by the crimping portion 5 a being crimped. With this structure, even if a load is applied to the pulley itself from the front of the pulley (leftward in the figure), the bent portion 5b bent inward can be replaced, so that the bearing 7 can be displaced from the ring 5, that is, the pulley 1. Absent.

  Here, at the corner of the bent portion 5b opposite to the compressor side (front side) and on the pulley 1 side (outer diameter side), a recess 5d like a step is provided as shown in FIG. Correspondingly, a projection 1d is provided on the pulley 1 side. The recess 5d and the protrusion 1d are fitted, and the protrusion 1d acts so as to receive a load from the rear (compression device side). For example, when caulking the caulking part 5a and the ring 6 from the rear, Since the axial force acting forward is supported by the protrusion 1d, the protrusion 1d functions so that the caulking force does not act on the bearing 7. At this time, since the bent portion 5b has a long lever, it bends even if it receives an axial load acting from the rear to the front, and the protrusion 1d substantially takes charge of the load.

  Further, at the corner of the ring 5 on the compressor side (rear side) and on the pulley 1 side (outer diameter side), as shown in FIG. 2, an extension 5e is provided so as to bend in the outer diameter direction. Correspondingly, a step 1e is provided on the pulley 1 side. The extending portion 5e and the stepped portion 1e are fitted and act to assist the attachment of the ring 5 to the pulley 1. Further, when the pulley 1 rotates, heat is generated in the bearing 7, but the expansion portion 5e has a widened shape as shown in the figure, so that the heat radiation area is increased and this heat is compressed through the expansion portion 5e. It acts to escape to the space 13 on the machine side, that is, to improve the heat dissipation performance.

3 and 4 show a second embodiment of the present invention and variations thereof. Referring to FIGS. 3 and 4, the element parts of FIGS. 3 and 4 that are the same as or similar to the element parts of the first embodiment disclosed in FIGS. 1 and 2 are designated by the same reference numerals. In the first embodiment, as shown in FIG. 3, the ring 6 may be a U-shaped ring. Further, a wire having a circular or elliptical cross section as shown in FIG. 4 may be used.
Instead of mounting the bearing 7 by caulking of the ring 5, it is possible to press-fit the ring 6. The same effect can be obtained by bonding. Furthermore, the bending part 5b should just be bend | folded inside. The shape may be circumferential (or annular), but may be partially bent.
Since other configurations are the same as those of the first embodiment, description thereof will be omitted.

FIG. 5 shows a third embodiment of the present invention. Referring to FIG. 5, the element parts of FIG. 5 that are the same as or similar to the element parts of the first embodiment disclosed in FIGS. 1 and 2 are designated by the same reference numerals.
In the present embodiment, as shown in FIG. 5, another example of the ring bent portion is shown. The same effect can be obtained with a structure in which the bent portion is a separate part. The annular plate-shaped receiving member 5b and the ring 5 are integrated by means such as press fitting and welding.
Other configurations are the same as those of the first embodiment.

Next, effects and operations of the above embodiment will be described. The following effects can be expected from the power transmission device according to the first embodiment of the present invention.
-In the past, the bearing was installed by inserting the bearing into the ring and then crimping the front end of the ring, so the position of the bearing could shift when an external load was applied to the pulley. On the other hand, in the present invention, the front part of the ring is manufactured by bending, the bearing is attached from the rear of the ring, and the annular part is attached from the rear of the ring to be caulked. On the other hand, even if a load is applied from the outside, the position of the bearing can be prevented from shifting.

  In addition to the effects of the first embodiment, the power transmission device according to the second embodiment of the present invention enables various bearing and ring fixing methods such as crimping and bonding in addition to caulking. Show.

With the power transmission device according to the third embodiment of the present invention, the following effects can be further expected.
-By forming the ring and the bent part separately, they can be formed in a simpler shape, so that the ring can be easily processed.

In the above description, the power transmission device of the present invention has been described as being used for a car air conditioner. However, the present invention is not limited to this and may be used for devices other than a car air conditioner.
In the embodiment described above or shown in the accompanying drawings, the torque limiter is a type that breaks at the notch, but the present invention is not limited to this. For example, the connecting pin is sheared. Another type of torque limiter that breaks may be used. Further, the torque limiter is provided at a position different from the above, such as provided on the rotating shaft side or provided on the elastic part of the hub. There may be.

  In addition, the power transmission device of the present invention is characterized by a configuration including a pulley, a bearing for supporting the pulley, and a ring for attaching the bearing to the pulley. For example, a hub, a torque limiter, a pulley The connecting structure between the hub and the hub, the connecting structure between the hub and the rotating shaft, etc. may be other than the above.

  The above-described embodiment is an example of the present invention, and the present invention is not limited by the embodiment, but is defined only by matters described in the claims, and other embodiments than the above are also possible. It can be implemented.

FIG. 1 is a side sectional view of the upper half of the power transmission device 20 according to the first embodiment. FIG. 2 is a partially enlarged cross-sectional view of the vicinity of the ring of the power transmission device 20 of FIG. FIG. 3 is a partial cross-sectional view of the vicinity of the ring similar to FIG. 2 according to the second embodiment of the present invention. FIG. 4 is a partial cross-sectional view of the vicinity of the ring similar to FIG. 2 of the modification of the second embodiment of the present invention. FIG. 5 is a partial cross-sectional view of the vicinity of the ring similar to FIG. 2 according to the third embodiment of the present invention. FIG. 6 is a side sectional view similar to FIG. 1 showing a conventional example of a power transmission device with a torque limiter used in a car air conditioner. FIG. 7 is a partially enlarged cross-sectional view of the vicinity of the ring of the power transmission device 50 of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pulley 1a Uneven part 1c Pocket part 2 Hub 2b Uneven part 2c Outer hub 2d Elastic part 2e Inner hub 2g Fitting part 3 Torque limiter 3a Fitting part 3b Notch part 3c Screw part 4 Shaft 4a Screw part 4b Tool shape 5 Ring 5a Caulking portion 5b Bending portion 5c Ring insertion portion 6 Ring 7 Bearing 8 Washer
9 Casing 9a Boss part 20 Power transmission device

Claims (7)

In the power transmission device (20) for transmitting a rotational driving force from a driving device such as an engine to a driven device such as a compressor, the power transmission device includes:
A pulley (1) to which a belt for transmitting rotational driving force is attached;
A hub (2) connecting the pulley (1) to a rotating shaft (4) of a driven device;
A bearing (7) for supporting the pulley (1) in a rotatable manner;
A ring (5) which is fitted and fixed to the pulley (1) and attaches the bearing (7) so as not to move relative to the pulley (1);
It has
The ring (5) has a bent portion (5b) acting so that the bearing (7) abuts on the ring (5) and does not move any further, and a first bent portion (5b) opposite to the driven device side. The bearing (7) is mounted on the second end (5a) of the ring opposite to the first end by carrying out processing such as deformation, joining, and crimping. A power transmission device fixed to the ring (5). A ring (6) is further provided, the ring (5) accommodates the bearing (7) therein;
The power transmission according to claim 1, wherein the ring (6) is installed inside the ring (5) so as to come into contact with the bearing (7) on the driven device side. apparatus.   The power transmission device according to claim 2, wherein the ring (6) has a circular ring shape having a square, rectangular, circular, elliptical, or U-shaped cross section.   4. The bearing (7) is fixed to the ring (5) by caulking the second end (5a) of the ring (5). The power transmission device according to claim 1.   The power transmission device according to any one of claims 1 to 4, wherein the bent portion (5b) is formed separately from the ring (5).   The power transmission device according to any one of claims 1 to 5, further comprising a torque limiter (3).   The power transmission device according to any one of claims 1 to 6, wherein the power transmission device is used in a vehicle air conditioner.

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