JP2008157344A - One-way clutch unit assembling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a one-way clutch unit assembling method allowing easy installation of rolling bearings while preventing a reduction in the sealing performance of contact type seals. <P>SOLUTION: In the one-way clutch unit assembling method, a one-way clutch 23 is arranged at an axial middle between a rotating shaft 21 and a pulley 22 arranged concentrically inside and outside in the radial direction, and rolling bearings 24, 25 having the contact type seals 29, 30 which are fixed to one bearing rings 24b, 25b and whose lip portions 29b, 30b contact the other bearing rings 24a, 25a are pressed and fitted into both sides of the one-way clutch 23. After one rolling bearing 24 is incorporated to one side of the one-way clutch 23 between the rotating shaft 21 and the pulley 22, the rolling bearing 25 before assembling the contact type seal thereon is pressed into the other side of the one-way clutch 23 and then the contact type seal 30 is installed on the rolling bearing 25. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is incorporated in a pulley of an auxiliary machine such as an alternator of an automobile, an air conditioner compressor, a water pump, a cooling fan, etc., and is unidirectional between two rotating members concentrically arranged inside and outside in the radial direction. The present invention relates to a method for assembling a one-way clutch unit in which a clutch is incorporated and bearings are arranged on both sides of the one-way clutch.

  For example, some pulleys of auxiliary machines such as an alternator of an automobile, a compressor for an air conditioner, a water pump and a cooling fan incorporate a one-way clutch unit (see, for example, Patent Document 1).

  FIG. 5 shows an example of the overall structure of the one-way clutch unit disclosed in Patent Document 1. As shown in the figure, the one-way clutch unit is interposed between a rotating shaft 1 and a pulley 2 that are concentrically arranged inside and outside in the radial direction, and an axially central portion between the rotating shaft 1 and the pulley 2. The main part is composed of the one-way clutch 3 and the two rolling bearings 4 and 5 disposed on both sides of the one-way clutch 3 between the rotary shaft 1 and the pulley 2.

  The one-way clutch 3 includes an inner ring 6 fitted to the rotary shaft 1 by press-fitting, an outer ring also used as the pulley 2 (hereinafter referred to as a pulley), an outer diameter surface of the inner ring 6 and an inner diameter surface of the pulley 2. A plurality of rollers 7 interposed so as to be disengageable between them and a retainer 8 for holding each roller 7 constitute a main part.

  In the one-way clutch 3, a cam surface is formed on the outer diameter surface of the inner ring 6, and a wedge-shaped gap is formed in the circumferential direction between the cam surface and the inner diameter surface of the pulley 2. By controlling engagement / disengagement of the roller 7 in the wedge-shaped gap by a coil spring (not shown) attached to the cage 8 and energizing the roller 7 with an elastic force, the inner ring 6 (rotary shaft 1) is controlled. Rotational torque is transmitted / interrupted between the pulley 2 and the pulley 2.

  The two rolling bearings 4 and 5 disposed on both sides of the one-way clutch 3 are fitted between the outer diameter surface of the rotary shaft 1 and the inner diameter surface of the pulley 2 by press-fitting. That is, the inner rings 4a and 5a, which are one of the components of the rolling bearings 4 and 5, are fitted to the rotary shaft 1 by press-fitting, and the outer rings 4b and 5b which are other components are connected to the pulley 2. Are fitted by press fitting.

On the other hand, contact type seals 9 and 10 are assembled to the rolling bearings 4 and 5 in order to prevent foreign matter and water from entering the inside of the one-way clutch unit. The contact type seals 9 and 10 ensure the dust resistance and water resistance of the one-way clutch unit. The contact-type seals 9 and 10 are disposed between the inner rings 4a and 5a and the outer rings 4b and 5b at the outer ends of the rolling bearings 4 and 5, and are fixed to inner diameter surfaces of the outer ends of the outer rings 4b and 5b, for example. The lip portions 9b and 10b are brought into contact with the outer diameter surfaces of the outer end portions of 4a and 5a.
JP 2000-227129 A

  By the way, in the conventional one-way clutch unit described above, as shown in FIG. 6, after the one-way clutch 3 and one rolling bearing 4 are assembled between the rotating shaft 1 and the pulley 2, the other rolling bearing 5 is rotated. It is assembled by press-fitting between the shaft 1 and the pulley 2.

  When the other rolling bearing 5 is assembled, the inner ring 5a of the rolling bearing 5 is press-fitted into the rotary shaft 1 and the outer ring 5b is press-fitted into the pulley 2. Therefore, between the inner ring 5a and the rotary shaft 1 and between the outer ring 5b and Since there is no gap between the pulleys 2 and the contact-type seal 10 is assembled at the outer end of the rolling bearing 5, there is no escape space for the internal air of the one-way clutch unit.

  As a result, the pressure of the internal air of the one-way clutch unit increases, and it becomes difficult to press-fit the other rolling bearing 5. Further, since the internal air whose pressure has been increased tends to escape from the lip portion 10b of the contact type seal 10 of the rolling bearing 5, the lip portion 10b of the contact type seal 10 is easily deformed, and the sealing performance of the one-way clutch unit. It will cause a decline.

  Accordingly, the present invention has been proposed in view of the above-described problems, and the object of the present invention is to facilitate the incorporation of a rolling bearing and to prevent the deterioration of the sealing performance due to the contact-type seal. An object of the present invention is to provide a method for assembling a directional clutch unit.

  As a technical means for achieving the above-described object, the present invention provides a one-way clutch disposed at a central portion in the axial direction between a rotating shaft and a pulley disposed concentrically on the outer side in the radial direction. An assembly method for a one-way clutch unit, in which rolling bearings having contact-type seals fixed to one bearing ring and having a lip portion in contact with the other bearing ring are fitted and inserted by press-fitting on both sides of the direction clutch, After incorporating one rolling bearing on one side of the one-way clutch between the rotary shaft and pulley, press the rolling bearing before assembly of the contact seal on the other side of the one-way clutch, and then roll the rolling bearing. A contact type seal is assembled to the bearing.

  In the present invention, after one rolling bearing is incorporated on one side of the one-way clutch between the rotating shaft and the pulley, the rolling bearing before assembly of the contact type seal is press-fitted on the other side of the one-way clutch. Thus, by assembling the contact type seal to the rolling bearing, when press-fitting the rolling bearing before the assembly of the contact type seal, the internal air of the one-way clutch unit can escape from between the inner and outer rings of the rolling bearing. The internal air pressure rise of the direction clutch unit is eliminated. In addition, since the contact type seal is assembled after the rolling bearing is press-fitted, the lip portion of the contact type seal is not deformed by escape of internal air.

  In the present invention, after one rolling bearing is incorporated on one side of the one-way clutch between the rotating shaft and the pulley, the rolling bearing before assembly of the contact type seal is press-fitted on the other side of the one-way clutch. Then, a contact type seal is assembled to the rolling bearing.

  Thus, when press-fitting the rolling bearing before the assembly of the contact-type seal, the internal air of the one-way clutch unit can be released from between the inner and outer rings of the rolling bearing. As a result, the rolling bearing can be easily press-fitted and the assembly of the one-way clutch unit is improved.

  Further, since the contact-type seal is assembled after the rolling bearing is press-fitted, the lip portion of the contact-type seal is not deformed by the escape of internal air, so that the sealing performance of the one-way clutch unit can be ensured.

  An embodiment of a method for assembling a one-way clutch unit according to the present invention will be described in detail below. In the following embodiments, for example, a one-way clutch unit incorporated in a pulley of an auxiliary machine such as an automobile alternator, an air conditioner compressor, a water pump or a cooling fan will be described, but the present invention is limited to this. Without limitation, the present invention can be applied to devices other than auxiliary pulleys.

  1 and 2 show an example of the overall structure of a one-way clutch unit in an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line AA in FIG.

  As shown in the figure, the one-way clutch unit is disposed in the axially central portion between the rotary shaft 21 and the pulley 22 and the rotary shaft 21 and the pulley 22 that are concentrically arranged inside and outside in the radial direction. The main part is composed of the one-way clutch 23 and the two rolling bearings 24 and 25 disposed on both sides of the one-way clutch 23 between the rotary shaft 21 and the pulley 22.

  The one-way clutch 23 is fitted to the rotary shaft 21 by press-fitting, and is used as the pulley 22 and the inner ring 26 in which a plurality of flat cam surfaces 26a are formed on the outer diameter surface at equal intervals in the circumferential direction. An outer ring having a cylindrical surface 22a, a plurality of rollers 27 detachably interposed between the cam surface 26a of the inner ring 26 and the cylindrical surface 22a of the pulley 22, and the rollers 27 are held at equal intervals in the circumferential direction. The main part is composed of the cage 28. In this embodiment, a roller type one-way clutch will be described. However, the present invention can also be applied to a type one-way clutch using another engagement element such as a sprag.

  In the cage 28, a plurality of pockets 28a are formed at equal intervals in the circumferential direction at positions corresponding to the cam surface 26a of the inner ring 26, and rollers 27 are individually accommodated in the respective pockets 28a so as to be able to roll. In addition, a coil spring 31 is attached to the retainer 28 along the circumferential direction thereof, and the tip of the coil spring 31 protrudes from the retainer 28 and contacts the roller 27 accommodated in the pocket 28a. (Refer to FIG. 2).

  In the one-way clutch 23, a wedge-shaped gap 32 (see FIG. 2) is formed in the circumferential direction between a cam surface 26 a formed on the outer diameter surface of the inner ring 26 and the cylindrical surface 22 a of the pulley 22. By controlling the engagement / disengagement of the roller 27 in the wedge-shaped gap 32 with the elastic force of the coil spring 31 in contact with the roller 27, the rotational torque between the inner ring 26 (rotary shaft 21) and the pulley 22 is controlled. Transmission and interruption are performed.

  For example, when the pulley 22 is rotated and driven only in one direction (clockwise in FIG. 2) and the rotary shaft 21 is driven, the operation of the one-way clutch 23 is as follows. When the rotational speed of the pulley 22 is increased, the roller 27 rolls toward the narrow side of the wedge-shaped gap 32 between the pulley 22 and the inner ring 26 by the elastic force of the coil spring 31 and engages between the pulley 22 and the inner ring 26. Include. As a result, the inner ring 26 (rotating shaft 21) is integrated with the pulley 22 to be locked and rotate synchronously. On the other hand, when the rotation speed of the pulley 22 decreases and the rotation speed of the inner ring 26 becomes higher than that of the pulley 22, the roller 27 rolls toward the wide side of the wedge-shaped gap 32 against the elastic force of the coil spring 31 and rotates. become. As a result, the pulley 22 and the inner ring 26 (rotating shaft 21) are in a free state and rotate relative to each other.

  The two rolling bearings 24 and 25 arranged on both sides of the one-way clutch 23 are fitted into the inner rings 24a and 25a fitted by press-fitting to the outer diameter surface of the rotary shaft 21 and the cylindrical surface 22a of the pulley 22 by press-fitting. A plurality of balls 24c and 25c, which are interposed between the outer diameters of the outer rings 24b and 25b, the outer diameter surfaces of the inner rings 24a and 25a and the inner diameter surfaces of the outer rings 24b and 25b, and the plurality of balls 24c and 25c. The main part is comprised with the holder | retainers 24d and 25d hold | maintained at the circumferential direction equal intervals.

  Contact rolling seals 29 and 30 are assembled to the rolling bearings 24 and 25 in order to prevent foreign matter and water from entering the one-way clutch unit. The contact-type seals 29 and 30 are closed at the outer ends of the gaps between the outer rings 24b and 25b and the inner rings 24a and 25a, thereby ensuring the dust resistance and water resistance of the one-way clutch unit. ing.

  The contact-type seals 29 and 30 are disposed between the inner rings 24a and 25a and the outer rings 24b and 25b at the outer ends of the rolling bearings 24 and 25, and are fixed to the inner diameter surfaces of the outer ends of the outer rings 24b and 25b, for example. Lip portions 29b and 30b are in contact with the outer diameter surfaces of the outer ends of the inner rings 24a and 25a. Specifically, the contact-type seals 29 and 30 are obtained by fixing seal materials 29c and 30c formed of synthetic rubber to steel cores 29a and 30a, and a lip portion on the inner peripheral side of the seal materials 29c and 30c. 29b and 30b are provided.

  A method for assembling the one-way clutch unit configured as described above will be described in detail below.

  First, as shown in FIG. 3, a one-way clutch 23 is incorporated in the central portion in the axial direction between the rotary shaft 21 and the pulley 22, and one rolling bearing 24 is provided on one side (left side in the drawing) of the one-way clutch 23. Assemble. The one rolling bearing 24 is fitted between the rotary shaft 21 and the pulley 22 by press-fitting in a state where a contact seal 29 is incorporated between the inner ring 24a and the outer ring 24b.

  After one rolling bearing 24 is assembled in this way, the other rolling bearing 25 is assembled to the other side (right side in the drawing) of the one-way clutch 23. At this time, the other rolling bearing 25 does not have the contact seal 30 attached. The other rolling bearing 25 is fitted between the rotary shaft 21 and the pulley 22 by press-fitting, but since the contact seal 30 is not attached, it is unidirectional from between the inner ring 25a and the outer ring 25b of the rolling bearing 25. The internal air of the clutch unit can be released and the pressure of the internal air of the one-way clutch unit is not increased. As a result, press-fitting of the rolling bearing 25 is facilitated, and the assemblability of the one-way clutch unit is improved.

  After press-fitting the rolling bearing 25 before the assembly of the contact seal, the contact seal 30 is assembled between the inner ring 25a and the outer ring 25b of the rolling bearing 25 as shown in FIG. Thus, since the contact-type seal 30 is assembled after the rolling bearing 25 is press-fitted, the lip portion 30b of the contact-type seal 30 is not deformed by the escape of internal air. As a result, the sealing performance of the one-way clutch unit can be ensured.

  The present invention is not limited to the above-described embodiments, and can of course be implemented in various forms without departing from the scope of the present invention. The scope of the present invention is not limited to patents. It includes the equivalent meanings recited in the claims, and the equivalent meanings recited in the claims, and all modifications within the scope.

In embodiment of this invention, it is sectional drawing which shows the whole structure of a one-way clutch unit. It is sectional drawing which follows the AA line of FIG. In embodiment of this invention, it is sectional drawing which shows the state which incorporates the other rolling bearing, after incorporating one rolling bearing. FIG. 4 is a cross-sectional view showing a state in which the contact seal is assembled from the state of FIG. 3 in the embodiment of the present invention. It is sectional drawing which shows the whole structure of a one way clutch unit. In a prior art example, it is sectional drawing which shows the state which incorporates the rolling bearing which assembled | attached the other contact type seal | sticker after incorporating one rolling bearing.

Explanation of symbols

21 Rotating shaft 22 Pulley 23 One-way clutch 24, 25 Rolling bearing 24a, 25a Race ring (inner ring)
24b, 25b Raceway (outer ring)
29, 30 Contact type seal 29b, 30b Lip part

Claims (1)

  A one-way clutch is disposed in the central portion in the axial direction between the rotary shaft and a pulley arranged concentrically on the outer side in the radial direction. The one track is fixed to one raceway on both sides of the one-way clutch. An assembly method for a one-way clutch unit in which a rolling bearing having a contact-type seal with a ring in contact with a ring is press-fitted into the wheel, on one side of the one-way clutch between the rotating shaft and a pulley. One-way clutch characterized in that, after one rolling bearing is assembled, a rolling bearing before assembling the contact seal is press-fitted into the other side of the one-way clutch, and then the contact seal is assembled to the rolling bearing. Unit assembly method.

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