JP2007198440A - Manufacturing method for bearing-integrated type pulley - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for a bearing-integrated type pulley, capable of washing a painting object face of a pulley without leaving an unwashed area, in a washing process that is a preprocess of a painting process. <P>SOLUTION: This manufacturing method for the bearing-integrated type pulley of the present invention has the process wherein a lip part 15d of a seal 15 is arranged in an annular recess 3c provided in an axial-directional end part inner circumferential face of the pulley 3, wherein an outer diameter of a masking tool 17 for covering an axial-directional end part opening of the pulley 3 when washing is formed into an outside diameter substantially consistent with an inside diameter of the recess 3c, wherein the masking tool 17 is pushed into the recess 3c under the condition where an outer end face thereof is brought into noncontact with an axial-directional side face of the pulley 3 and under the condition where a tool outer circumferential face is laid along a bottom wall inner circumferential face 3d, wherein the lip part 15d is brought into pressure contact annularly with a side wall annular face 3e of the recess 3c by an outer diameter side of the masking tool 17 in the condition having a fastening margin, and wherein the painting-objective faces 3a, 3f are washed under the annularly pressure-contacting condition. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method of manufacturing a bearing-integrated pulley in which a rolling bearing is integrally attached to a pulley. Bearing-integrated pulleys are guided by winding a belt around the outer peripheral surface of the pulley, for example, a crank pulley attached to a crankshaft of an engine such as an automobile, and each auxiliary machine attached to the periphery of the engine. Auxiliary pulleys, tension pulleys for adjusting belt tension, and idler pulleys for guiding the belt. Examples of the auxiliary machine include an air conditioner compressor, a water pump, an alternator, a cooling fan, and an engine starting motor.

  A pulley unit used in a belt transmission system includes a pulley that wraps and guides a belt, and a rolling bearing that supports the pulley. Generally, the pulley has an outer surface and an axial side surface (surface to be painted) with rust and corrosion protection. For the purpose of, etc., coating is performed (for example, see Patent Document 1). A pulley incorporated in such a pulley unit includes a bearing-integrated pulley in which a rolling bearing is integrated. In the pulley with integrated bearing, the outer peripheral surface and both side surfaces (surfaces to be coated) of the pulley are painted for rust prevention, corrosion prevention, and the like. By this coating, a coating film is formed with a certain film thickness on the surface to be coated.

  In the bearing-integrated pulley, since the rolling bearing is integrated on the inner diameter side of the pulley, no painting is performed on the inner diameter side of the pulley. Further, in the case of painting, there is a washing process for washing the surface to be painted of the pulley so as to prevent coating unevenness as a pre-process.

  The cleaning process will be described with reference to FIG. The bearing-integrated pulley shown in FIG. 7 has an outer peripheral surface 3a of the pulley 3 as a belt guide surface, and an inner ring 7 is arranged on the inner diameter side via a rolling element (not shown). A contact type seal (sealing device) 13 for sealing a lubricant such as grease for lubricating the inside of the bearing is disposed between the inner peripheral surface of the end portion and the outer peripheral surface of the end portion in the axial direction of the inner ring 7. In addition, a lip portion 15d of a contact-type seal 15 that mainly prevents intrusion of muddy water, sand dust and the like is disposed in the annular recess 3c on the outside in the axial direction.

  In the cleaning process, it is necessary to prevent the cleaning liquid from entering so that the cleaning liquid does not enter the inside of the bearing to contaminate the lubricant. Even when the seal 15 is disposed on the bearing, for example, when cleaning is performed by ultrasonic cleaning or the like, the lip portion 15d of the seal 15 is a rubber material, and the lip portion 15d is almost slidable with respect to the mating contact surface. Because of the light contact without tightening allowance, the lip part is deformed by the cleaning pressure, and a gap is generated between the tip of the lip part and the mating contact surface. The internal lubricant is contaminated. In addition, the seal 15 is not a contact-type seal, but a non-contact-type seal, of course, allows cleaning liquid to easily enter the bearing.

   Moreover, since the inner peripheral surface of the inner ring 7 is a highly accurate fit with a shaft body or the like inserted through the inner peripheral side, it is necessary to prevent contamination with the cleaning liquid.

  Therefore, when cleaning, the outer diameter side 17c of the outer end surface of the masking jig 17 is pressed against the inner diameter side region 3f1 of the axial side surface 3f of the pulley 3 so as to cover the opening of the pulley 3 and is coated by ultrasonic cleaning or the like. Clean the target surface.

However, in the conventional cleaning, since the inner diameter side region 3f1 of the axial side surface 3f of the pulley 3 is covered with the outer diameter side 17c of the outer end surface of the masking jig 17, the inner diameter side region 3f1 becomes an uncleaned region. The unwashed area becomes a poor coating area in the subsequent coating process, and rust is not developed, and the life of the bearing-integrated pulley may be shortened.
JP 2004-205009 A

  An object of the present invention is to provide a method of manufacturing a bearing-integrated pulley that can clean the surface to be painted of the pulley without a region that has not been cleaned in a cleaning process that is a pre-process of the coating process.

  In the manufacturing method of a bearing-integrated pulley according to the present invention, a rolling bearing is disposed integrally with the pulley on the inner diameter side of the pulley, and the inner peripheral surface of the pulley in the axial direction and the outer peripheral surface of the axial end of the inner ring of the rolling bearing. A bearing unit having a cleaning step of cleaning the surface to be coated as a step before coating the outer peripheral surface and the axial side surface of the pulley, which is the surface to be coated, with a bearing-integrated pulley having a seal interposed therebetween. In the body pulley manufacturing method, in the cleaning step, the lip portion of the seal is disposed in an annular recess provided on the inner peripheral surface of the axial end portion of the pulley, and covers the axial end opening of the pulley during cleaning. The masking jig is pressed into the recess with the outer end surface of the jig not contacting the axial side surface of the pulley, and the lip portion arranged above is pressed into contact with the inner wall surface of the recess. This pressure contact In state is characterized in that a step of washing the coated target surface.

  The rolling bearing may be one in which an outer ring raceway is provided on the inner peripheral surface of the pulley and the pulley is used as a substitute for the outer ring, or the outer ring is fitted and fixed to the inner peripheral surface of the pulley.

  The rolling bearing may be provided with an inner ring raceway on the outer peripheral surface of the shaft body, the shaft body serving as a substitute for the inner ring, or an inner ring fitted and fixed to the outer peripheral surface of the shaft body.

  The rolling bearing is not limited to its type such as a ball bearing or a roller bearing.

  The seal includes a seal that seals the inside of the bearing with a lubricant that lubricates the inside of the bearing, a seal that prevents muddy water, dust, and the like from entering the inside of the bearing from the outside of the bearing.

  The seal may be a contact seal in which the lip portion contacts the inner peripheral surface of the pulley, or a non-contact seal in which the lip portion faces the inner peripheral surface of the pulley with a minute seal gap.

  The pulley with integrated bearing has a pulley and a shaft body arranged concentrically on the inner diameter side thereof, a one-way clutch in an annular space between the pulley and the shaft body, and first and second rolling bearings on both sides in the axial direction. And at least one rolling bearing integrated with a pulley.

  The bearing-integrated pulley includes a pulley and a rolling bearing, and includes an outer ring in which the rolling bearing is fitted and fixed to the inner peripheral surface of the pulley, an inner ring arranged concentrically on the inner diameter side of the outer ring, and an outer ring and an inner ring. The present invention can also be applied to a device provided with a plurality of rolling elements arranged so as to freely roll. In this case, a seal is disposed between the axial ends of the outer ring and the inner ring, and when the surface to be painted of the pulley is cleaned, the seal is pressed against the annular surface of the annular recess of the pulley with a masking jig. It may be allowed to.

  According to the present invention, when the pulley opening is covered with a masking jig when the bearing-integrated pulley is cleaned, the outer end surface outer diameter side of the masking jig covers the inner diameter side region on the side surface in the axial direction of the pulley which is the surface to be coated with the pulley. There is nothing. Further, since the inside of the bearing is sealed by pressing the lip portion in the recess with a masking jig in a state where the inner wall surface of the recess has an allowance, there is no possibility that the cleaning liquid enters the bearing. Therefore, in the present invention, the entire surface to be coated can be cleaned before coating, and there is no region left uncleaned.

  As described above, according to the present invention, the surface to be coated can be coated without coating defects to prevent rust and the like, and the life of the bearing-integrated pulley can be maintained for a long time.

  In the above, it is preferable to include a painting step of painting the surface to be painted in a state where the axial end opening of the pulley is covered with the masking jig after the washing in the washing step. In this case, since the masking jig used in the cleaning process is used, the side surface in the axial direction of the pulley, which is the surface to be painted, is not covered with the masking jig even in the painting process, and an unpainted area can be eliminated.

  In the above, the outer diameter of the masking jig is the outer diameter substantially matching the inner diameter of the inner peripheral surface of the bottom wall of the recess, and the outer diameter side of the masking jig is along the inner peripheral surface of the bottom wall of the recess It is preferable to push the masking jig into the recess. In such a case, since the outer diameter of the masking jig is substantially the same as the inner diameter of the inner peripheral surface of the bottom wall of the recess, when the masking jig is pushed into the recess, the masking jig is moved to the outer diameter side. Can be guided and pushed by the inner peripheral surface of the bottom wall of the recess, and the masking jig can be easily mounted.

  In this case, the overall outer diameter of the masking jig is not limited to an outer diameter that substantially matches the inner diameter of the inner peripheral surface of the bottom wall of the recess, but a part of the outer diameter on the outer end side of the masking jig. May be an outer diameter that substantially matches the inner diameter of the inner peripheral surface of the bottom wall of the recess. For example, a protruding portion is provided at the outer diameter end of the outer end surface of the masking jig, and the outer diameter of the protruding portion substantially matches the inner diameter of the inner peripheral surface of the bottom wall of the recess so that the outer end surface does not contact the side surface of the pulley. An outer diameter may be sufficient.

  According to the present invention, a bearing that can clean the outer peripheral surface of the pulley and both side surfaces in the axial direction without any uncleaned area in the cleaning process, which is the previous process of the painting process, so that there is no coating defect in the entire area to be painted in the painting process. A method of manufacturing a body pulley can be provided. In addition, it is possible to easily and reliably prevent the cleaning liquid from entering the bearing by using the seal mounted on the bearing-integrated pulley.

  Hereinafter, a method for manufacturing a bearing-integrated pulley according to an embodiment of the present invention will be described with reference to the accompanying drawings.

(Embodiment 1)
FIG. 1 and FIG. 2 are for explaining the cleaning process during the manufacturing process of the bearing-integrated pulley. FIG. 1 shows a state of the bearing just before the masking jig is pushed into the axial end opening of the pulley. FIG. 2 is a cross-sectional view of an essential part of a pulley with an integrated bearing, showing a state in which a masking jig is pushed into the axial end opening of the pulley.

  FIG. 3 is a cross-sectional view of a main part of the bearing-integrated pulley for explaining the painting process during the manufacturing process of the bearing-integrated pulley and showing a state in which the masking jig is pushed into the axial end opening of the pulley. It is.

  The manufacturing process of the bearing-integrated pulley includes a coating process in which the outer peripheral surface, which is the surface to be painted of the pulley, and both side surfaces in the axial direction are coated for rust prevention or the like. In the manufacturing process of the bearing integrated pulley, there is a cleaning process for cleaning the surface to be painted as a pre-process of the painting process.

  Referring to FIG. 1, a bearing-integrated pulley 1 to be cleaned has an annular shape as a whole by a metal material such as carbon steel having a belt guide surface composed of a plurality of V-grooves arranged in parallel with an outer peripheral surface 3 a. An inner ring 7 is disposed on the inner diameter side of the formed pulley 3 via a plurality of rolling elements (not shown). The pulley 3 has an outer ring raceway on its inner peripheral surface. In this case, although not shown, the outer ring may be fitted and fixed to the inner peripheral surface. The inner ring 7 includes an inner ring raceway facing the outer ring raceway on the outer peripheral surface thereof. Between the outer ring raceway and the inner ring raceway, a plurality of rolling elements made of balls or rollers (not shown) held in a cage are arranged. Thus, the bearing-integrated pulley 1 to be cleaned has an inner ring 7 disposed on the inner diameter side of the pulley 3 with respect to the pulley 3, and a plurality of rolling elements that are held in a cage and disposed on the outer ring raceway and the inner ring raceway. The rolling bearing 11 which consists of is integrated. When the outer ring separate from the pulley 3 is fitted and fixed to the inner peripheral surface of the pulley 3, the rolling bearing is held on the outer ring, the inner ring 7, and the cage and arranged on the outer ring raceway and the inner ring raceway. It consists of a plurality of rolling elements. The rolling bearing 11 is further provided with an internal seal 13 that seals a lubricant such as grease that lubricates the inside of the bearing, and an axial end portion side of the internal seal 13 so that muddy water and sand dust enter the bearing. And an external seal 15 to prevent. The names of the inner seal 13 and the outer seal 15 are given merely for the purpose of understanding the arrangement position in the axial direction. In this case, the present invention is not limited to the two inner and outer seals 13 and 15 as described above, and includes the case where one seal is arranged. The external seal 15 is configured by fixing an elastic rubber material 15b to a metal ring (annular core) 15a by vulcanization bonding or the like. The elastic rubber material 15b forms an annular base portion 15c fitted and fixed to the inner ring 7 side, and an annular lip portion 15d extending from the annular base portion 15c to the pulley 3 side.

  The annular base portion 15c of the outer seal 15 is fixed to the outer peripheral surface of the inner ring 7 in the axial direction as described above, and the annular lip portion 15d is disposed in the annular recess 3c on the inner peripheral surface of the pulley 3 in the axial direction. Yes. The annular recess 3c has a bottom wall inner peripheral surface 3d that faces the inner diameter side and is substantially flat in the axial direction, and a side wall annular surface that rises in an annular shape radially inward from the axially inner depth of the bottom wall inner peripheral surface 3d. It is composed of a space surrounded by 3e. The annular lip portion 15d of the outer seal 15 makes slight contact with the side wall inner surface 3e of the annular recess 3c with a slight margin to seal the inside of the bearing, thereby preventing intrusion of drunk from the outside.

  However, in the light contact state, a non-contact state is likely to occur due to external pressure, vibration, or the like.

  In the bearing-integrated pulley 1 whose configuration has been described in detail for the understanding of the cleaning process according to the embodiment, the masking jig 17 includes the outer peripheral surface 3a of the pulley, which is the coating target surface, and the side surfaces 3f on both axial sides. In order to cover the opening in the axial direction so that the cleaning liquid does not enter the inside of the pulley 3 at the time of cleaning before coating.

  In the masking jig 17, the outer diameter side 17 a of the axial jig end is arranged so as to substantially match the inner diameter of the inner peripheral surface 3 d of the bottom wall of the annular recess 3 c provided on the inner peripheral surface of the pulley 3 in the axial direction. A lip portion pressing portion 17b having a diameter (however, the outer diameter is slightly smaller than the inner diameter) and projecting in an annular shape is formed.

  The masking jig 17 may be made entirely of an elastic rubber material, or only the lip portion pressing portion 17b may be made of an elastic rubber material. Similarly, by using at least the lip portion pressing portion 17b as an elastic rubber material, when the lip portion 15d made of the elastic rubber material is pushed toward the side wall annular surface 3e of the annular recess 3c, the lip portion 15d is damaged by the pressing. So that you do n’t have to.

  The cleaning process will be described. As shown in FIG. 1, a masking jig 17 is disposed on one axial side of the bearing-integrated pulley 1. Next, as shown in FIG. 2, the masking jig 17 is moved along the outer peripheral surface of the lip pressing portion 17 b of the masking jig 17 along the inner peripheral surface 3 d of the bottom wall of the annular recess 3 c at the axial end of the pulley 3. While positioning, the lip portion pressing portion 17b is pushed into the annular recess 3c, thereby pressing the lip portion 15d of the external seal 15. Since the lip portion 15d is made of an elastic rubber material, the lip portion 15d is compressed and brought into contact with the side wall annular surface 3e of the annular recess 3c with a sufficient allowance. A compressed portion of the lip portion 15d due to this contact is indicated by a virtual line. When the lip portion 15d comes into contact with the side wall annular surface 3e of the annular recess 3c in a state having a tightening margin, the cleaning liquid cannot enter the bearing through the lip portion 15d. In this state, the inner diameter side 3f1 of the side surface 3f of the pulley 3 is not covered with the outer diameter side of the outer end face of the masking jig 17, and is exposed so as to be cleaned. In this state, the outer peripheral surface 3a and the side surface 3f, which are the coating target surfaces of the pulley 3, are cleaned. The cleaning method is not particularly limited, and examples include ultrasonic cleaning, spray nozzle cleaning, jet nozzle cleaning, and dip cleaning. The cleaning liquid is not particularly limited as long as it can move, remove, and disperse solid dirt, liquid dirt, and the like from the outer peripheral surface 3a and the side face 3f of the pulley 3. For example, pure water, alkaline water Etc.

  In the above cleaning process, the outer peripheral surface 3a and the side surface 3f, which are the coating target surfaces of the pulley 3, can be cleaned. In particular, the inner diameter side region 3f1 of the side surface 3f is conventionally covered with the outer diameter side of the outer end surface of the masking jig 17, and is left uncleaned. In the present embodiment, the inner diameter side region 3f1 is cleaned. I was able to do that.

  After the above cleaning process is performed, the coating target surfaces 3a and 3f of the pulley 3 are dried, and then, as shown in FIG. 3, the lip pressing part 17b of the masking jig 17 is circularly moved as in the cleaning process. The side wall annular surface 3e of the annular recess 3c is annularly pressed into a state having a tightening margin, and the coating target surfaces 3a and 3f of the pulley 3 are painted in this pressure-contacted state. In this case, for example, there are spray coating, dip coating, etc., in which a coating is formed into fine particles and sprayed toward the surface to be coated to form a coating film. There are no particular limitations on the type of paint, but there are resins excellent in rust prevention and corrosion resistance, such as water-soluble alkyd resin paints, and further epoxy ester resin paints. In this way, the anticorrosive and anticorrosive coating film 19 is formed with a required film thickness on the coating target surfaces 3a and 3f of the pulley.

(Embodiment 2)
A method for manufacturing the bearing-integrated pulley according to the second embodiment will be described with reference to FIGS. FIG. 4 is a cross-sectional view of the main part of the bearing-integrated pulley immediately before the masking jig is pushed into the axial end opening of the pulley, and FIG. 5 is the masking jig pushed into the axial end opening of the pulley. It is principal part sectional drawing of the bearing integrated pulley which shows the state which was carried out.

  In the method for manufacturing the bearing-integrated pulley according to the second embodiment, the annular lip portion 15d of the outer seal 15 includes the inner peripheral surface 3d of the bottom wall and the annular annular surface of the annular recess 3c on the inner peripheral surface of the pulley 3 in the axial direction. The labyrinth seal structure is non-contact with 3e. The annular lip portion 15d is pushed from the state shown in FIG. 5 to the state shown in FIG. 6 by the pressing portion 17b of the masking jig 17, and the annular lip portion 15d comes into pressure contact with the side wall annular surface 3e of the annular recess 3c. The coating target surfaces 3a and 3f are cleaned in the state.

  Note that the pushing prevents the cored bar from being permanently plastically deformed within the elastic deformation region of the cored bar.

  In the second embodiment as well, as in the first embodiment, the inner diameter side region 3f1 of the side surface 3f is conventionally covered with the outer diameter side of the outer end surface of the masking jig 17, and is left uncleaned. The inner diameter side region 3f1 can be cleaned.

  Note that the painting process for coating the outer peripheral surface 3a and the side surface 3f of the washed pulley 3 in the second embodiment is the same as the painting process in FIG. 3 described in the first embodiment, and therefore illustration and description thereof are omitted. .

(Application example of the embodiment)
The above-described bearing-integrated pulley 1 can be applied to an alternator pulley unit 21 shown in FIG. The pulley unit 21 includes a pulley 3, a shaft body 23 (corresponding to the inner ring 7) concentrically arranged with the pulley, a one-way clutch 24 interposed in an annular space between the pulley 3 and the shaft body 23, A first rolling bearing 25 (corresponding to the rolling bearing 11) composed of a deep groove ball bearing disposed on both axial sides of the directional clutch 24 and a second rolling bearing 27 (corresponding to the rolling bearing 11) composed of a needle roller bearing are provided. . Since the configuration of the pulley unit 1 is detailed in Japanese Patent Application Laid-Open Nos. 2003-21225 and 2004-205090, detailed description thereof is omitted here. A belt 29 is wound around the outer peripheral surface of the pulley 3.

  The present invention is not limited to the above-described embodiment, and includes various changes or modifications within the scope described in the claims.

It is sectional drawing which uses for the description of the washing | cleaning process in the manufacturing method of the bearing integrated pulley which concerns on Embodiment 1, and shows the principal part of a bearing integrated pulley in the state which has arrange | positioned the masking jig in the front. It is sectional drawing which shows the principal part of the pulley with an integrated bearing in relation to FIG. 1 in a state where the lip portion of the seal is pressed by a masking jig. It is sectional drawing which shows the principal part of a bearing integrated pulley in the state by which the lip | rip part of the seal was pressed with the masking jig regarding the coating process after completion | finish of washing | cleaning. It is sectional drawing which uses for the description of the washing | cleaning process in the manufacturing method of the bearing integrated pulley which concerns on Embodiment 2, and shows the principal part of a bearing integrated pulley in the state which has arrange | positioned the masking jig in the front. FIG. 5 is a cross-sectional view showing the main part of the bearing-integrated pulley in a state where the lip portion of the seal is pressed by a masking jig in relation to FIG. 4. It is sectional drawing of the pulley unit incorporating the bearing integrated pulley to which the washing | cleaning process of embodiment is applied. FIG. 10 is a cross-sectional view illustrating a conventional cleaning process for a bearing-integrated pulley, with a main part of the bearing-integrated pulley covered with a masking jig.

Explanation of symbols

1 Bearing integrated pulley 3 Pulley 3a Outer peripheral surface (surface to be painted)
3b outer ring raceway 3c annular recess 3d bottom wall inner peripheral surface 3e side wall annular surface 3f side surface (surface to be painted)
7 Inner ring 15 External seal 17 Masking jig

Claims (3)

A rolling bearing is arranged integrally with the pulley on the inner diameter side of the pulley, and a seal is disposed between the inner peripheral surface of the axial end of the pulley and the outer peripheral surface of the axial end of the inner ring of the rolling bearing. In the manufacturing method of a pulley with integrated bearing, including a cleaning step of cleaning the coating target surface as a step before coating the outer peripheral surface and the axial side surface of the pulley that is the coating target surface,
The washing step is
A lip portion of the seal is arranged in an annular recess provided on the inner peripheral surface of the axial end portion of the pulley, and a masking jig for covering the axial end opening of the pulley during cleaning is disposed on the outer end surface of the pulley. A step of pressing the lip portion into a state of being tightly contacted with the inner wall surface of the concave portion in a state of non-contact with the axial side surface, and cleaning the surface to be coated in the state of the pressure contact. A method for producing a bearing-integrated pulley, characterized in that   2. The bearing integrated type according to claim 1, further comprising a coating step of coating the surface to be coated in a state where the axial end opening of the pulley is covered with the masking jig after the cleaning in the cleaning step. A pulley manufacturing method.   The masking jig has an outer diameter substantially equal to the inner diameter of the inner peripheral surface of the bottom wall of the recess, and the masking jig is in a state where the outer diameter side of the masking jig is along the inner peripheral surface of the bottom wall of the recess. The method for manufacturing a pulley with an integrated bearing according to claim 1, wherein the pulley is pushed into the recess.

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