JP2010242883A - Bearing with pulley - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent seal suction even if the pressure of a bearing interior changes while maintaining sealability of a seal member. <P>SOLUTION: In the bearing with a pulley equipped with a rolling bearing 2 interposing a plurality of rolling elements 6 between an inner ring 4 and an outer ring 5 and sealing axial both ends between the inner ring 4 and the outer ring 5 by annular seal members 8, 9, and a resin pulley 3 fixed to an outer peripheral surface of the outer ring 5 of the rolling bearing 2, one seal member 8 has a seal lip 14 contacting an inner side groove wall 15 of a seal groove 10 formed in the inner ring 4 or the outer ring 5, and the other seal member 9 has a seal lip 16 contacting an outer side groove wall 17 of the seal groove 10 formed in the inner ring 4 or the outer ring 5. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a bearing with a pulley in which a resin pulley is fixed to an outer peripheral portion of a rolling bearing in which both axial ends between an inner ring and an outer ring are sealed with an annular seal member.

  A pulley-equipped bearing is used as an idler pulley or tension pulley for guiding the movement of a timing belt for driving an engine cam or an auxiliary belt for driving an auxiliary machine. In this bearing with pulley, a resin pulley is fixed to the outer peripheral portion of the outer ring of the rolling bearing.

  As a rolling bearing of this pulley-equipped bearing, there is known one in which a plurality of balls are interposed between an inner ring and an outer ring, and both axial ends between the inner ring and the outer ring are sealed with an annular seal member.

  In the rolling bearing, seal grooves are formed at both axial ends of the outer peripheral surface of the inner ring, and a locking groove is formed on the inner peripheral surface of the outer ring so as to face the seal groove. The outer peripheral part of the member is press-fitted and fixed.

  Each seal member has a seal lip on its inner periphery, and both of the seal lips contact the outer groove wall of the seal groove or the inner groove wall. Thereby, leakage of the lubricant from the inside of the bearing surrounded by both the inner ring and the outer ring and the entry of foreign matter from the outside is prevented.

  However, in the above rolling bearing, when the pressure inside the bearing changes in accordance with the temperature change inside the bearing, seal adsorption in which the seal lip firmly adheres to the seal groove may occur. When seal adsorption occurs, the friction generated between the seal member and the inner ring increases, and the rotational torque of the rolling bearing increases.

  Here, in the rolling bearing in which the seal lip is in contact with the outer groove wall of the seal groove, the seal lip is sucked toward the inside of the bearing even if the pressure inside the bearing is reduced. The contact pressure on the surface becomes weak and seal adsorption does not occur, but when the pressure inside the bearing rises, the seal lip is pressed toward the outside, so the seal lip adheres to the outer groove wall and seal adsorption occurs. There is.

  On the other hand, in a rolling bearing in which both seal lips contact the inner groove wall of the seal groove, even if the pressure inside the bearing rises, the seal lip is pressed toward the outside. The contact pressure becomes weak and seal adsorption does not occur, but when the pressure inside the bearing decreases, the seal lip is sucked toward the inside of the bearing, so the seal lip is adsorbed on the inner groove wall and seal adsorption may occur. is there.

  Therefore, as a rolling bearing capable of preventing the occurrence of the above-mentioned seal adsorption in both cases where the pressure inside the bearing rises and falls, a slit that communicates the inside and outside of the bearing with the seal lip of the seal member (For example, refer to Patent Documents 1 and 2). This rolling bearing discharges air inside the bearing from the slit when the pressure inside the bearing rises, and sucks outside air from the slit when the pressure inside the bearing drops, Is the same as the external pressure to prevent the occurrence of sticking.

Japanese Utility Model Publication No. 06-73454 Republished 2003-042563

  However, since the above-mentioned rolling bearing is in a state where the inside and outside of the bearing are in continuous communication through the slit, foreign matters such as water and dust are likely to enter together when taking in external air from the slit. For this reason, there is a possibility that the raceway surfaces and balls of the inner and outer rings may be damaged by the invading foreign matter and the life of the bearing may be reduced.

  The problem to be solved by the present invention is to prevent the sticking of the seal even if the pressure inside the bearing changes while maintaining the sealing performance of the seal member.

  In order to solve the above-described problems, the pulley-equipped bearing according to the present invention has a plurality of rolling elements interposed between the inner ring and the outer ring, and both axial ends between the inner ring and the outer ring are sealed with annular seal members. A rolling bearing and a resin pulley fixed to an outer peripheral surface of the outer ring of the rolling bearing, and the one seal member has a seal lip that contacts an inner groove wall of a seal groove formed in the inner ring or the outer ring. The other seal member has a seal lip that contacts an outer groove wall of a seal groove formed in the inner ring or the outer ring.

  In this way, the seal lip of one seal member contacts the inner groove wall of the seal groove. Therefore, when the pressure inside the bearing rises, the seal lip that contacts the inner groove wall is deformed outward. Away from the inner groove wall, the air inside the bearing is discharged to the outside. Therefore, the pressure rise inside the bearing is suppressed, and the occurrence of seal adsorption can be prevented.

  Further, since the seal lip of the other seal member contacts the outer groove wall of the seal groove, when the pressure inside the bearing decreases, the seal lip that contacts the outer groove wall is deformed toward the inside of the bearing and the outer groove wall The outside air is sucked into the bearing. Therefore, the pressure drop inside the bearing can be suppressed and the occurrence of seal adsorption can be prevented.

  When the pressure change inside the bearing is suppressed, the seal lip comes into contact with the groove wall of the seal groove and the inside of the bearing returns to the sealed state, so that foreign matter such as water and dust enters when external air is sucked in. Hard to do. On the other hand, when the seal lip moves away from the inner groove wall and the air inside the bearing is discharged, the discharged air can prevent foreign matter from entering the bearing.

  When the outer ring is formed with a locking groove facing the sealing groove at both axial ends of the inner ring, and the seal member is fixed to the locking groove, it is used in an environment where water tends to accumulate near the locking groove of the outer ring. It is effective when If the fixed part end surface of the pulley is located outside the locking groove of the outer ring in the axial direction, water tends to accumulate on the fixed part end surface. However, since the sealing member is fixed to the locking groove, the bearing is supported by the sealing member. This is because water can be reliably prevented from entering the inside.

  When the inner ring is formed with a locking groove facing the seal groove at both axial ends of the outer ring, and the seal member is fixed to the locking groove, it is used in an environment where water tends to accumulate near the locking groove of the inner ring. It is effective when If dust covers that cover the axial ends of the inner ring and the outer ring are attached to both sides of the inner ring in the axial direction, water tends to accumulate near the locking groove between the seal member and the dust cover. This is because since the member is fixed, the seal member reliably prevents water from entering the bearing.

  A locking groove facing the sealing groove at one axial end of the inner ring is formed in the outer ring, the one sealing member is fixed to the locking groove, and a sealing groove at the other axial end of the outer ring. When the inner ring is formed with a locking groove opposite to the inner ring and the other seal member is fixed to the locking groove, it is used in an environment where water is likely to accumulate in the vicinity of the inner ring locking groove and the outer ring locking groove. It is effective in the case. For example, a dust cover that covers the axial end between the inner ring and the outer ring is attached to the side where the locking groove of the inner ring is formed, and the fixed part end surface of the pulley is located on the outer side in the axial direction of the locking groove of the outer ring. .

  The seal member can be provided with a labyrinth slip that forms a labyrinth with an outer peripheral surface of the inner ring in which the seal groove is formed or an inner peripheral surface of the outer ring in which the seal groove is formed. In this way, the labyrin slip can prevent the lubricant from flowing out to the bottom of the seal groove.

  When the resin pulley fixed to the rolling bearing is used as a guide for the movement of a belt for transmitting the driving force of the engine to a camshaft or an auxiliary machine, when the bearing with each pulley is attached to the engine, the seal member Among them, a seal member where the seal lip contacts the outer groove wall of the seal groove is disposed on the engine side, and a seal member where the seal lip contacts the inner groove wall of the seal groove is disposed on the opposite side of the engine. It is preferable to do so.

  Since the bearings with pulleys are usually mounted close to the engine, there is hardly any foreign matter such as water or dust between them, and the seal lip of the engine side seal member is separated from the outer groove wall and externally attached. This is because when the air is sucked in, foreign matter hardly enters the bearing.

  A slit that communicates the inside and outside of the bearing surrounded by the inner ring, the outer ring, and the seal member may be formed in the seal member disposed on the engine side. Even if a slit is formed in the seal member disposed on the engine side, it is considered that there is no problem because foreign matter such as water and dust hardly enters when external air is sucked into the bearing. If it does in this way, since the pressure inside a bearing can be made the same as an external pressure through a slit, the rotational torque of a bearing can be kept constant.

  In the rolling bearing, a resin pulley is preferably fixed to the outer peripheral surface of the outer ring by insert molding. In insert molding, the temperature inside the bearing at the time of molding becomes very high, so the pressure inside the bearing decreases greatly when the temperature inside the bearing returns to room temperature after molding, and the seal lip is placed on the inner groove wall of the seal groove. This is because seal adsorption that strongly adsorbs is particularly likely to occur. According to this pulley-equipped bearing, the seal lip that contacts the outer groove wall of the seal groove of the seal member is separated from the outer groove wall, and external air is sucked into the bearing, thereby preventing the occurrence of seal adsorption. it can.

  In the bearing with a pulley according to the present invention, when the pressure inside the bearing changes, either one of the seal lips is deformed and separated from the groove wall of the seal groove, so that the pressure change inside the bearing can be suppressed. Can be prevented. In addition, when the pressure change inside the bearing is suppressed, the seal lip contacts the groove wall of the seal groove and the inside of the bearing returns to the sealed state. Therefore, when external air is sucked into the bearing, water and dust It is difficult for foreign objects such as

The expanded sectional view which shows the bearing with a pulley of 1st Embodiment of this invention Fig. 1 is an enlarged cross-sectional view of the vicinity of the ball bearing of the pulley-equipped bearing shown in Fig. 1. 2 is an enlarged cross-sectional view of the vicinity of the seal lip that contacts the inner groove wall of the ball bearing shown in FIG. 2 is an enlarged cross-sectional view of the vicinity of the seal lip that contacts the outer groove wall of the ball bearing shown in FIG. Sectional drawing which shows the ball bearing which provided the labyrin slip in the sealing member shown in FIG. Sectional drawing which shows the bearing with a pulley of 2nd Embodiment of this invention. Sectional drawing which shows the ball bearing which provided the labyrin slip in the sealing member shown in FIG. Sectional drawing which shows the bearing with a pulley of 3rd Embodiment of this invention. Sectional drawing which shows the ball bearing which provided the labyrin slip in the sealing member shown in FIG. Sectional drawing which shows the state which attached the bearing with a pulley shown in FIG. 2 to the engine FIG. 10 is an enlarged cross-sectional view of the vicinity of the seal lip of the seal member on the engine side of the bearing with pulley shown in FIG.

A pulley-equipped bearing according to a first embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the pulley-equipped bearing 1 includes a ball bearing 2 and a resin pulley 3, and an inner peripheral portion of the resin pulley 3 is fixed to the outer peripheral portion of the ball bearing 2 by insert molding. .

  As shown in FIG. 2, the ball bearing 2 includes an inner ring 4, an outer ring 5 fixed to the resin pulley 3, balls 6 as a plurality of rolling elements interposed between the inner ring 4 and the outer ring 5, A cage 7 that holds 6 at a predetermined interval in the circumferential direction, and annular seal members 8 and 9 that seal both axial ends between the inner ring 4 and the outer ring 5 are provided.

  The inner ring 4 is formed with circumferentially continuous seal grooves 10 and 10 at both axial ends of the outer peripheral surface 4a. The outer ring 5 is formed with locking grooves 11, 11 that are continuous in the circumferential direction so as to face the seal grooves 10, 10 on the inner peripheral surface 5 a thereof.

  Each of the seal members 8 and 9 is an elastic body made of synthetic rubber or the like (for example, nitrile rubber or the like) reinforced with a cored bar 12, and its outer peripheral portion 13 is press-fitted and fixed in the locking grooves 11 and 11, respectively. Yes.

  One seal member 8 has a seal lip 14 that extends to the inner diameter side at its inner peripheral portion and that has its tip end bent inward in the axial direction. The tip of the seal lip 14 has a seal groove as shown in FIG. 10 inner groove walls 15 are in contact.

  The other seal member 9 has a seal lip 16 extending on the inner diameter side at its inner peripheral portion and having its tip end bent outward in the axial direction, and the tip of the seal lip 16 has a seal groove as shown in FIG. 10 outer groove walls 17 are in contact. As a result, the bearing interior 18 surrounded by the inner ring 4, the outer ring 5, and the seal members 8 and 9 is sealed, and leakage of lubricant from the bearing interior 18 and entry of foreign matter from the outside are prevented.

  The pulley-equipped bearing 1 according to the present invention configured as described above is caused by friction between the inner and outer rings 4, 5 and the balls 6 and friction between the inner ring 4 and the seal members 8, 9 during rotation. When the temperature of the interior 18 rises and the pressure in the bearing interior 18 increases, the seal lips 14 and 16 are deformed so as to be pressed toward the outside. For this reason, there is a possibility that seal adsorption occurs in which the seal lip 16 of the seal member 9 is firmly adhered to the outer groove wall 17. When seal adsorption occurs, friction generated between the seal members 8 and 9 and the inner ring 4 increases, and the rotational torque of the ball bearing 2 increases.

  However, the seal lip 14 of the seal member 8 is deformed so as to be pressed toward the outside as shown by a one-dot chain line in FIG. 3, and is separated from the inner groove wall 15 so that the air inside the bearing 18 is discharged to the outside. The Therefore, the pressure increase in the bearing interior 18 can be suppressed, and the occurrence of sticking can be prevented. When the pressure increase in the bearing interior 18 is suppressed, the seal lip 14 comes into contact with the inner groove wall 15 and the bearing interior 18 returns to the sealed state.

  On the other hand, in the bearing 1 with pulley, when the temperature inside the bearing 18 decreases due to external moisture, the pressure inside the bearing 18 decreases, so that the seal lips 14 and 16 are sucked toward the bearing inside 18. Deform. Therefore, there is a possibility that the seal lip 14 of the seal member 8 is attracted to the inner groove wall 15 and the seal torque is generated, and the rotational torque of the ball bearing 2 is increased.

  However, the seal lip 16 of the seal member 9 is deformed so as to be sucked toward the bearing interior 18 as shown by a one-dot chain line in FIG. Sucked. Therefore, the pressure drop in the bearing interior 18 is suppressed, and the occurrence of sticking can be prevented. When the pressure drop in the bearing interior 18 is suppressed, the seal lip 16 contacts the outer groove wall 17 and the bearing interior 18 returns to the sealed state.

  Thus, in the bearing 1 with pulley, the seal lip 16 contacts the outer groove wall 17 when the pressure drop in the bearing inner 18 is suppressed even if the seal lip 16 is separated from the outer groove wall 17. Since the state 18 returns to the sealed state, foreign matters such as water and dust are less likely to enter when external air is sucked into the bearing interior 18. On the other hand, when the seal lip 14 is separated from the inner groove wall 15 and the air inside the bearing 18 is discharged, the discharged air can prevent foreign matter from entering the bearing inside 18.

  Further, in the bearing 1 with pulley, when the ball bearing 2 is fixed to the resin pulley 3 by insert molding, the temperature inside the bearing 18 becomes very high, and therefore, when the temperature inside the bearing 18 returns to room temperature after molding. In particular, the pressure drop in the bearing interior 18 becomes large, and seal adsorption in which the seal lip 14 firmly adheres to the inner groove wall 15 of the seal groove 10 is particularly likely to occur. However, in the bearing with pulley 1 of this embodiment, when the pressure inside the bearing interior 18 decreases, the seal lip 16 of the seal member 9 moves away from the outer groove wall 17 and external air is sucked into the bearing interior 18. The occurrence of sticking can be prevented.

  Furthermore, as shown in FIG. 2, the pulley-equipped bearing 1 has the fixed portion end surface 3 a of the resin pulley 3 on the outer side in the axial direction of the locking groove 11 of the outer ring 5, so that water tends to accumulate on the fixed portion end surface 3 a, There is a possibility that water accumulated on the fixed portion end surface 3a may enter the bearing interior 18 through the locking groove 11. However, since the outer peripheral portion 13 of the seal members 8 and 9 is fixed to the locking groove 11 in the bearing 1 with pulley, the outer peripheral portion 13 of the seal members 8 and 9 connects the fixed portion end surface 3a to the bearing inner portion 18. Water entry is reliably prevented.

  Moreover, in the bearing 1 with a pulley of this embodiment, you may form the labyrinth slips 19 and 20 in the inner peripheral part of each seal member 8 and 9, as shown in FIG. The labyrinth slips 19, 20 are located on the outer diameter side of the outer peripheral surface 4 a of the inner ring 4, are close to the opening edge 10 a on the inner side in the axial direction of the seal groove 10 via a minute gap, and the outer peripheral surface 4 a of the inner ring 4. A labyrinth is formed between them. As a result, the lubricant can be prevented from flowing out to the bottom of the seal groove 10, and leakage of the lubricant to the outside can be reliably prevented.

  FIG. 6 shows a pulley-equipped bearing 21 according to the second embodiment of the present invention. The bearing with pulley 21 is different from the first embodiment in that seal members 22 and 23 that are fixed to the inner ring 4 and are in contact with the outer ring 5 are used, and other parts are the same as those in the first embodiment. Hereinafter, parts corresponding to those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  Seal grooves 24, 24 that are continuous in the circumferential direction are formed at both axial ends of the inner peripheral surface 5 a of the outer ring 5. The outer circumferential surface 4a of the inner ring 4 is formed with locking grooves 25, 25 that are continuous in the circumferential direction so as to face the sealing grooves 24, 24. The locking grooves 25, 25 have seal members 22, The inner peripheral part 26 of 23 is press-fitted and fixed.

  The outer peripheral portion of one seal member 22 has a seal lip 27 that extends to the outer diameter side and has a tip end bent inward in the axial direction, and the tip end of the seal lip 27 contacts the inner groove wall 28 of the seal groove 24. is doing. The outer peripheral portion of the other seal member 23 has a seal lip 29 that extends to the outer diameter side and has its tip end bent outward in the axial direction, and the tip of the seal lip 29 contacts the outer groove wall 30 of the seal groove 24. ing. As a result, the bearing interior 18 surrounded by the inner ring 4, the outer ring 5, and the seal members 22 and 23 is sealed, and leakage of lubricant from the bearing interior 18 and entry of foreign matter from the outside are prevented.

  The pulley-equipped bearing 21 is effective when used in an environment where water tends to accumulate in the vicinity of the locking grooves 25, 25 of the inner ring 4. For example, when dust covers that cover the axial ends between the inner ring 4 and the outer ring 5 are attached to both sides in the axial direction of the inner ring 4, between the dust covers and the inner peripheral portions 26 of the seal members 22 and 23. Although water tends to accumulate, the inner peripheral portions 26 of the seal members 22 and 23 are respectively fixed to the locking grooves 25 and 25 of the inner ring 4. This is because water can be prevented from entering.

  Further, the pulley-equipped bearing 21 of the second embodiment, as shown in FIG. 7, may have labyrin slips 31 and 32 formed on the outer peripheral portions of the seal members 22 and 23 as in the case of the first embodiment. Good. The labyrinth slips 31 and 32 are located on the inner diameter side of the inner peripheral surface 5a of the outer ring 5 and are close to the opening edge 24a on the inner side in the axial direction of the seal groove 24 through a minute gap. A labyrinth is formed with 5a.

  FIG. 8 shows a bearing 33 with a pulley according to a third embodiment of the present invention. The ball bearing 33 is obtained by replacing the seal member 9 of the first embodiment with a seal member 39 fixed to the inner ring 4 and in contact with the outer ring 5. Hereinafter, parts corresponding to those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In the bearing 33 with pulley, a circumferentially continuous seal groove 34 is formed at one axial end portion of the outer peripheral surface 4 a of the inner ring 4, and the inner peripheral surface 5 a of the outer ring 5 is circumferentially opposed to the seal groove 34. A locking groove 35 that is continuous with the groove is formed. One seal member 8 has an outer peripheral portion 13 that is press-fitted and fixed in a locking groove 35, and an inner peripheral seal lip 14 is in contact with an inner groove wall 36 of the seal groove 34.

  A seal groove 37 continuous in the circumferential direction is formed at the other axial end portion of the inner peripheral surface 5a of the outer ring 5. A circumferentially continuous locking groove 38 is formed on the outer peripheral surface 4 a of the inner ring 4 so as to face the seal groove 37, and the inner peripheral portion 40 of the other seal member 39 is press-fitted and fixed to the locking groove 38. Has been.

  The outer peripheral portion of the other seal member 39 has a seal lip 41 that extends to the outer diameter side and has a distal end portion bent outward in the axial direction, and the distal end of the seal lip 41 contacts the outer groove wall 42 of the seal groove 37. ing. As a result, the bearing interior 18 is sealed, and leakage of lubricant from the bearing interior 18 surrounded by the inner ring 4, the outer ring 5, and the seal members 8 and 39 and entry of foreign matter from the outside are prevented.

  The pulley-equipped bearing 33 can be used even in an environment where water tends to accumulate in the vicinity of the locking groove 38 of the inner ring 4. For example, the case where the dust cover which prevents the penetration | invasion of the dust to the bearing inside 18 is attached to the side in which the locking groove 38 of the inner ring | wheel 4 was formed is mentioned.

  As in the first embodiment, the bearing with pulley 33 forms the labyrinth slip 19 on the inner peripheral portion of the seal member 8 and the labyrin slip 43 on the outer peripheral portion of the seal member 39 as shown in FIG. May be. The labyrinth slip 43 is located on the inner diameter side of the inner peripheral surface 5a of the outer ring 5 and is close to the opening edge 37a on the inner side in the axial direction of the seal groove 37 via a minute gap. A labyrinth is formed between them.

  The resin pulleys 3 of the bearings with pulleys 1, 21 and 33 of the above embodiments are used as, for example, idler pulleys or tension pulleys that guide the movement of the belt that transmits the driving force of the engine to the camshaft or auxiliary equipment. Can do. When the pulley-equipped bearing 1 according to the first embodiment is attached to the engine, as shown in FIG. 10, the seal member 9 is disposed on the engine 44 side and the seal member 8 is disposed on the opposite side of the engine 44. preferable.

  Since the pulley-equipped bearing 1 is mounted close to the engine 44, foreign matter such as water and dust is unlikely to exist between them, and the seal lip 16 is separated from the outer groove wall 17 and the bearing interior 18 This is because the entry of foreign matter hardly occurs when external air is sucked.

  Similarly, when attaching the bearings 21 and 33 with pulleys of the second embodiment and the third embodiment to the engine 44 respectively, the seal members 23 and 39 are arranged on the engine 44 side, and the seal members 8 and 22 are connected to the engine 44. Can be placed on the opposite side.

  When the pulley-equipped bearing 1 according to the first embodiment is attached to the engine 44, as shown by a broken line in FIG. 11, the bearing interior 18 and the exterior are connected to the tip of the seal lip 16 of the seal member 9 disposed on the engine 44 side. It is preferable to form a slit 45 that communicates with each other. Even if the slit 45 is formed in the seal member 9 disposed on the engine 44 side, it is considered that there is no problem because foreign matter such as water and dust hardly enters when external air is sucked.

  In this way, since the bearing interior 18 and the exterior communicate with each other through the slit 45, the pressure in the bearing interior 18 can be made the same as the external pressure, and the rotational torque of the bearing 1 with pulley can be kept constant. .

  Similarly, when the pulley-equipped bearings 21 and 33 of the second embodiment and the third embodiment are respectively attached to the engine, the bearing interior 18 and the tip of the seal lips 29 and 41 of the seal members 23 and 39 arranged on the engine side are provided. A slit communicating with the outside can be formed.

2 Ball bearing 3 Resin pulley 4 Inner ring 4a Outer surface 5 Outer ring 5a Inner surface 6 Balls 8, 9, 22, 23, 39 Seal members 10, 24, 34, 37 Seal grooves 11, 25, 35, 38 Locking groove 14 , 16, 27, 29, 41 Seal lip 15 Inner groove wall 17 Outer groove wall 19, 20, 31, 32, 43 Labyrinth slip 44 Engine 45 Slit

Claims (8)

A plurality of rolling elements (6) are interposed between the inner ring (4) and the outer ring (5), and both end portions in the axial direction between the inner ring (4) and the outer ring (5) are annular seal members (8, 9). In a bearing with a pulley comprising a rolling bearing (2) sealed with a resin pulley (3) fixed to the outer peripheral surface of an outer ring (5) of the rolling bearing (2),
The one seal member (8) has a seal lip (14) that contacts an inner groove wall (15) of a seal groove (10) formed in the inner ring (4) or the outer ring (5). The seal member (9) of the pulley has a seal lip (16) that contacts an outer groove wall (17) of the seal groove (10) formed in the inner ring (4) or the outer ring (5). With bearing.   Locking grooves (11, 11) facing the seal grooves (10, 10) at both axial ends of the inner ring (4) are formed in the outer ring (5), and the locking grooves (11, 11) The bearing with a pulley according to claim 1, wherein the seal member (8, 9) is fixed.   Locking grooves (25, 25) facing the seal grooves (24, 24) at both axial ends of the outer ring (5) are formed in the inner ring (4), and the locking grooves (25, 25) The bearing with a pulley according to claim 1, wherein the seal member (22, 23) is fixed.   A locking groove (35) facing the sealing groove (34) at one axial end of the inner ring (4) is formed in the outer ring (5), and the one sealing member (8) is formed in the locking groove (35). ) And a locking groove (38) facing the sealing groove (37) at the other axial end of the outer ring (5) is formed in the inner ring (4), and the locking groove (38) The bearing with a pulley according to claim 1, wherein the other seal member (39) is fixed.   The seal member (8, 9) is provided with a labyrin slip (19, 20), and the labyrin slip (19, 20) is formed on the outer peripheral surface (4a) of the inner ring (4) in which the seal groove (10) is formed. The bearing with a pulley according to any one of claims 1 to 4, wherein a labyrinth is formed with an inner peripheral surface (5a) of the outer ring (5) in which the seal groove (24) is formed.   The resin pulley (3) fixed to the rolling bearing (2) guides the movement of the belt that transmits the driving force of the engine (44) to the camshaft or auxiliary equipment, and is attached to the engine (44). At this time, of the seal members (8, 9), the seal member (9) in which the seal lip (16) contacts the outer groove wall (17) of the seal groove (10) is disposed on the engine (44) side. The seal member (8), wherein the seal lip (14) contacts the inner groove wall (15) of the seal groove (10), is disposed on the opposite side of the engine (44). Bearing with pulley as described.   A seal member (9) disposed on the engine (44) side includes an inner bearing (18) surrounded by the inner ring (4), an outer ring (5), and both the seal members (8, 9), and an outside. The bearing with a pulley according to claim 6, wherein a slit (45) that communicates with each other is formed.   The said rolling bearing (2) is a bearing with a pulley in any one of Claims 1-7 by which the resin pulley (3) was fixed to the outer peripheral surface of the outer ring | wheel (5) by insert molding.

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