JP2010203522A - Bearing device with pulley - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device with a pulley, not causing abnormal noise and vibration in a belt and inhibiting deterioration of the durability even when vibration is caused in the belt. <P>SOLUTION: The bearing device 1 with the pulley includes a rolling bearing 2 and the annular pulley 3 formed on an outer periphery with a guide surface 8a around which the belt B is wound. In the inside of the pulley 3, an annular space 11 is formed along a circumferential direction of the pulley 3 for absorbing the vibration transmitted to the guide surface 8a from the belt B. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a bearing device with a pulley including, for example, a pulley around which a belt for driving auxiliary machinery of an automobile engine is wound.

2. Description of the Related Art In an auxiliary machine drive system for driving auxiliary machinery and the like of an automobile engine with a belt, a bearing device with a pulley is used to guide the running of the belt.
Such a pulley-equipped bearing device includes a rolling bearing and a resin pulley fixed to the outer ring of the rolling bearing. The pulley includes an outer cylindrical portion in which a guide surface around which a belt is wound is formed on an outer peripheral surface, an inner cylindrical portion fixed to an outer ring of a rolling bearing, and a disk portion connecting these.
In addition, since the disc portion is provided in the substantially axial center of the outer cylindrical portion and the inner cylindrical portion, the strength of the outer cylindrical portion when the belt is offset in the axial direction with respect to the center of the guide surface. In order to ensure this, a large number of reinforcing ribs that extend radially and connect the outer cylindrical portion and the inner cylindrical portion are arranged in the circumferential direction in the disk portion (see, for example, Patent Document 1).

JP-A-7-63249

In the bearing device with a pulley of the conventional example, the outer cylindrical portion is connected to a large number of reinforcing ribs arranged in the circumferential direction, so that the roundness of the outer cylindrical portion is likely to deteriorate during resin molding. Had a problem. When the roundness of the outer cylindrical portion of the pulley deteriorates, there is a risk that the belt may generate abnormal noise or vibration when the belt travels on the guide surface.
When vibration occurs in the belt, the vibration is directly transmitted to the rolling bearing via the pulley, and an excessive load acts on the rolling bearing, and abnormal separation of the raceway surface is likely to occur, and the durability of the rolling bearing is increased. It becomes a factor to reduce.
The present invention has been made in view of such circumstances, and does not cause abnormal noise or vibration in the belt, and suppresses a decrease in durability even if vibration occurs in the belt for some reason. An object of the present invention is to provide a pulley-equipped bearing device.

  To achieve the above object, the present invention provides a rolling bearing, and an annular pulley having an inner peripheral surface fixed to the outer ring of the rolling bearing and a guide surface around which a belt is wound. In the bearing device with a pulley provided, an annular space for absorbing vibration from the belt transmitted to the guide surface is formed in the pulley along the circumferential direction of the pulley. .

  According to the pulley-equipped bearing device configured as described above, even if vibration generated in the belt is transmitted to the guide surface, the vibration can be absorbed by the annular space formed inside the pulley. It is possible to suppress vibration from being transmitted to the rolling bearing. As a result, it is possible to prevent an excessive load caused by vibration from acting on the rolling bearing, and it is possible to suppress a decrease in durability of the rolling bearing.

In the bearing device with a pulley, the pulley is disposed concentrically on the inner peripheral side of the outer cylindrical portion and the outer cylindrical portion having the guide surface formed on the outer peripheral surface, and the inner peripheral surface is external to the outer ring. A fitted inner cylindrical portion, a pair of annular walls connecting the axial end portions of the inner cylindrical portion, and the axial end portions of the outer cylindrical portion, and the annular space of the outer cylindrical portion It is preferable that the inner circumferential surface, the outer circumferential surface of the inner cylindrical portion, and the inner surfaces of the pair of annular walls are defined.
In this case, since the outer cylindrical portion on which the guide surface is formed is supported by the inner cylindrical portion via the pair of annular walls, the circularity of the outer cylindrical portion is reduced as in the conventional example. Even if the reinforcing rib is not provided, the radial strength can be ensured when the belt is offset in the axial direction with respect to the center of the guide surface. Thereby, the fall of the roundness of an outer side cylindrical part can be suppressed, and it can suppress making a noise and a vibration generate | occur | produce in the belt wound around the said guide surface.

In addition, the pulley includes an annular first pulley member having a first annular recess opening along one circumferential end in the axial direction and a second annular recess opening circumferentially along the other axial end. An annular second pulley member formed along the first pulley member, and is configured by joining one axial end surface of the first pulley member and the other axial end surface of the second pulley member, The annular space may be formed by abutting the respective openings of the first annular recess and the second annular recess.
In this case, an annular space can be easily formed inside the pulley.

  In the bearing device with a pulley, it is preferable that a vibration damping member made of a vibration damping material is disposed in the annular space. In this case, the effect of absorbing vibration from the belt transmitted to the guide surface by the annular space is further improved. Can be increased.

  According to the bearing device with a pulley of the present invention, it is possible to suppress a decrease in durability even if abnormal noise or vibration is not generated in the belt and even if vibration is generated in the belt for some reason.

It is sectional drawing which shows the structure of the bearing apparatus with a pulley which concerns on 1st embodiment of this invention. It is sectional drawing which showed the aspect of the pulley at the time of assembling the bearing apparatus with a pulley. It is sectional drawing which shows the structure of the bearing apparatus with a pulley which concerns on 2nd embodiment of this invention.

Next, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing a configuration of a pulley-equipped bearing device according to a first embodiment of the present invention.
This bearing device with pulley 1 is used for guiding the travel of a belt in an accessory drive system for driving auxiliary machinery of an engine such as an automobile with a belt, and includes a support shaft ( A rolling bearing 2 fixed to the rolling bearing 2 and an annular pulley 3 fixed to the outer peripheral side of the rolling bearing 2 and around which a belt B for driving auxiliary machinery is wound.

  The rolling bearing 2 includes a plurality of balls that are rolling elements interposed between the inner ring 4 fitted and fixed to the support shaft, the outer ring 5 to which the pulley 3 is fixed, and the inner and outer rings 4 and 5. 6 and a cage 7 that holds the plurality of balls 6 at equal intervals in the circumferential direction.

  The pulley 3 is an annular member formed of, for example, phenol resin, and is disposed concentrically on the inner peripheral side of the outer cylindrical portion and the outer cylindrical portion 8 on which the guide surface 8a around which the belt B is wound is formed. And an inner cylindrical portion 9 whose inner peripheral surface 9a is fitted and fixed to the outer ring 5, and a pair of annular walls 10 that connect both axial ends of the inner cylindrical portion 9 and both axial ends of the outer cylindrical portion 8; It has.

  That is, since the outer cylindrical portion 8 is supported by the inner cylindrical portion 9 via the pair of annular walls 10, a reinforcing rib or the like that causes a decrease in the roundness of the outer cylindrical portion 8 as in the conventional example is provided. Even if it is not provided, it is possible to ensure the radial strength when the belt B is offset in the axial direction with respect to the center of the guide surface 8a. Thereby, the fall of the roundness of the outer cylindrical part 8 can be suppressed, and it is possible to suppress the generation of abnormal noise and vibration in the belt B wound around the guide surface 8a.

  On the inner peripheral surface 9a of the inner cylindrical portion 9, a pair of annular projections 9a1 that sandwich both end surfaces in the axial direction of the outer ring 5 are provided to protrude radially inward over the entire circumference. The pulley 3 is fixed to the outer ring 5 so that the inner cylindrical portion 9 is fitted and fixed to the outer ring 5 and the outer ring 5 is sandwiched between the pair of annular protrusions 9a1 so as to be integrally rotatable.

Inside the pulley 3, an annular space 11 is formed along the circumferential direction of the pulley. The annular space 11 is defined by the inner peripheral surface 8 b of the outer cylindrical portion 8, the outer peripheral surface 9 b of the inner cylindrical portion 9, and the inner side surfaces 10 a of the pair of annular walls 10.
As shown in FIG. 1, since the annular space 11 formed inside the pulley 3 is located between the outer cylindrical portion 8 and the inner cylindrical portion 9, the outer cylindrical portion 8 (the guide surface 8a thereof) Even if the vibration from the belt B is transmitted, it is possible to prevent the vibration from being transmitted directly from the outer cylindrical portion 8 to the inner cylindrical portion 9, and to relax and absorb the vibration. That is, the annular space 11 has a function of relaxing and absorbing vibration from the belt B transmitted to the guide surface 8a.

The pulley 3 is formed by joining two members divided in the axial direction along a broken line H in FIG.
Here, the manufacturing method of the bearing apparatus with a pulley of this embodiment is demonstrated.
FIG. 2 is a cross-sectional view showing an aspect of the pulley when the pulley-equipped bearing device is assembled. As shown in the figure, the pulley 3 includes an annular first pulley member 20 in which a first annular recess 20a that is open on one axial end face side is formed along the circumferential direction, and an opening on the other axial end face side. The second annular recess 21a is formed by combining and joining the annular second pulley member 21 formed along the circumferential direction.

  The first pulley member 20 includes a cylindrical first outer cylindrical portion 22, a first inner cylindrical portion 23 arranged concentrically on the inner peripheral side of the first outer cylindrical portion 22, and the annular wall shown in FIG. 10. The annular wall 10 on the first pulley member 20 side is erected from the other axial end of the first inner cylindrical portion 23 and connects the other axial end of the first outer cylindrical portion 22. The first annular recess 20a is formed by the inner peripheral surface of the first outer cylindrical portion 22, the outer peripheral surface of the first inner cylindrical portion 23, and the inner side surface of the annular wall 10 so as to open toward one end surface in the axial direction. ing.

  On the other hand, the second pulley member 21 is shown in FIG. 1 as a cylindrical second outer cylindrical portion 24, a second inner cylindrical portion 25 arranged concentrically on the inner peripheral side of the second outer cylindrical portion 24, and the like. And an annular wall 10. The annular wall 10 on the second pulley member 21 side is erected from one axial end of the second inner cylindrical portion 25 and connects one axial end of the second outer cylindrical portion 24. The second annular recess 21a is formed so as to open to the other axial end surface side by the inner peripheral surface of the second outer cylindrical portion 24, the outer peripheral surface of the second inner cylindrical portion 25, and the inner side surface of the annular wall 10. ing.

In order to manufacture the pulley bearing device 1, the first inner cylindrical portion 23 and the second inner cylindrical portion 25 are fitted on the outer ring 5 of the rolling bearing 2, while one end surface of the first pulley member 20 and the second The other end surface of the pulley member 21 is abutted. And while joining the end surface 22a of the axial direction one side of the 1st outer side cylindrical part 22 and the end surface 24a of the axial direction other end side of the 2nd outer side cylindrical part 24, it is the axial direction one side of the 1st inner side cylindrical part 23 The end surface 23a of the second inner cylindrical portion 25 and the end surface 25a on the other axial end side of the second inner cylindrical portion 25 are joined.
The joining between the end faces 22a and 24a and between the end faces 23a and 25a is fused by heating in a state where the two faces each other. Note that the end faces can be joined by using an adhesive or the like in addition to fusion.

As described above, by joining the first pulley member 20 and the second pulley member 21, the pulley 3 shown in FIG. 1 is configured, and the pulley bearing device 1 can be obtained.
Moreover, the 1st outer side cylindrical part 22 and the 2nd outer side cylindrical part 24 which were mutually joined as mentioned above comprise the outer side cylindrical part 8 shown in FIG. The cylindrical portion 23 and the second inner cylindrical portion 25 constitute the inner cylindrical portion 9 in FIG.

  Furthermore, when the annular space 11 in FIG. 1 is joined by abutting and joining one end face of the first pulley member 20 and the other end face of the second pulley member 21, the first annular recess 20 a of the first pulley member 20. And the opening of the second annular recess 21a of the second pulley member 21 are abutted against each other. Thus, since the annular space 11 is formed by abutting the opening of the first annular recess 20a and the opening of the second annular recess 21a, the annular space 11 is easily formed inside the pulley 3. be able to.

  Further, the first pulley member 20 and the second pulley member 21 constituting the pulley 3 sandwich each other's joint surface (a surface along the broken line H in FIG. 1) when viewed in the axial direction. It is formed symmetrically. In this case, since the first pulley member 20 and the second pulley member 21 can be formed in substantially the same shape, the pulley members 20 and 21 are common without preparing dedicated molds. It can be formed with a mold. As a result, the manufacturing cost can be reduced compared to the case where the shapes of the pulley members 20 and 21 are different from each other.

  According to the pulley-equipped bearing device 1 configured as described above, even if the vibration generated in the belt B is transmitted to the guide surface 8a, the vibration from the belt B formed in the pulley 3 and transmitted to the guide surface 8a. The vibration can be absorbed by the annular space 11 for absorbing the vibration, and the transmission of the vibration to the rolling bearing 2 can be suppressed. As a result, it is possible to prevent an excessive load caused by vibration from acting on the rolling bearing 2 and to suppress a decrease in durability of the rolling bearing 2.

FIG. 3 is a cross-sectional view showing the configuration of the pulley bearing device according to the second embodiment of the present invention.
The difference between this embodiment and the first embodiment is that a damping member 30 made of a damping material is arranged in the annular space 11. Since other points are the same as those in the first embodiment, description thereof is omitted.

In the figure, the damping member 30 is a member using, for example, foamed urethane resin, and is formed in an annular shape along the inner surface of the annular space 11. The urethane foam resin is a porous member and has vibration damping properties. As shown in FIG. 3, the damping member 30 is disposed inside the annular space 11 located between the outer cylindrical portion 8 and the inner cylindrical portion 9. When vibration from the belt B is transmitted to the surface 8a), the damping member 30 can more effectively absorb the vibration and prevent it from being transmitted to the inner cylindrical portion 9.
As described above, in the present embodiment, by arranging the damping member 30 in the annular space 11, the effect of absorbing vibration from the belt B transmitted to the guide surface 8a can be further enhanced.

  The present invention is not limited to the above embodiments. In each of the above embodiments, the case where the pulley 3 is formed of a phenol resin is exemplified, but nylon such as PA66, PA6, and PA612, PPS (polyphenylene sulfide) resin, and the like can be used, and the resin is further limited to the resin. For example, a light metal alloy such as an aluminum alloy may be used.

  Moreover, in the said 2nd embodiment, although the damping member 30 was formed with the foaming urethane resin, it can also form using the porous sintered alloy material which has damping property, a metallic rubber etc., for example. And the damping member 30 can also be comprised by filling the annular space 11 with steel wool.

DESCRIPTION OF SYMBOLS 1 Bearing apparatus with pulley 2 Rolling bearing 3 Pulley 5 Outer ring 8 Outer cylindrical part 8a Guide surface 8b Inner peripheral surface 9 Inner cylindrical part 9b Outer peripheral surface 10 Annular wall 10a Inner side surface 11 Annular space 10 Sealing device 11 Core metal 20 First pulley member 20a First annular recess 21 Second pulley member 21a Second annular recess B Belt

Claims (4)

Rolling bearings,
In a bearing device with a pulley comprising: an inner peripheral surface fixed to an outer ring of the rolling bearing, and an annular pulley formed with a guide surface on which the belt is wound on the outer periphery;
An annular space for absorbing vibration from the belt transmitted to the guide surface is formed in the pulley along the circumferential direction of the pulley. The pulley is
An outer cylindrical portion in which the guide surface is formed on the outer peripheral surface;
An inner cylindrical portion that is arranged concentrically on the inner peripheral side of the outer cylindrical portion and whose inner peripheral surface is externally fitted to the outer ring;
A pair of annular walls connecting the axial end portions of the inner cylindrical portion and the axial end portions of the outer cylindrical portion;
2. The bearing device with a pulley according to claim 1, wherein the annular space is defined by an inner peripheral surface of the outer cylindrical portion, an outer peripheral surface of the inner cylindrical portion, and inner surfaces of the pair of annular walls. The pulley is
An annular first pulley member in which a first annular recess opening on one end surface side in the axial direction is formed along the circumferential direction;
An annular second pulley member formed along the circumferential direction with a second annular recess opening on the other end surface side in the axial direction,
It is configured by joining one axial end surface of the first pulley member and the other axial end surface of the second pulley member,
The bearing device with a pulley according to claim 1, wherein the annular space is formed by abutting openings of the first annular recess and the second annular recess.   The bearing device with a pulley according to any one of claims 1 to 3, wherein a damping member made of a damping material is disposed in the annular space.

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