JP2007057012A - Rolling bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing device capable of imparting a consistently stable preload for a long period of time without causing axial rattling. <P>SOLUTION: The rolling bearing device comprises a rolling bearing 6 for rotatably bearing a rotating shaft 1 on a housing 10, and a preload imparting device 9 for thrusting an outer ring 13 in the axial direction to impart preload thereto. The preload imparting device 9 has a holder 14 fixed to the housing 10, a pusher 15 opposed to the holder 14 in the axial direction and having a thrusting face 15b for abutting on an end face 13b of the outer ring 13, and a torsional coil spring 16 mounted between the pusher 15 and the holder 14 in the energized condition. The pusher 15 is cylindrically fitted to the holder 14 via a screw portion and held to be movable forward/backward relative to the holder 14 in the axal direction. Ends 16a, 16b of the torsional coil spring 16 are locked to the holder 14 and the pusher 15, respectively. Thus, rotating force is imparted to the pusher 15 in a predetermined direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing device used for a reduction gear of an automobile or a general industrial machine, and more particularly to a rolling bearing device incorporating a preload applying device for holding the rolling bearing with a constant preload for a long period of time. .

  In general, a rolling bearing device rotatably supports a rotating shaft with respect to a housing by a rolling bearing composed of an angular ball bearing, a tapered roller bearing or the like fitted to both ends of the rotating shaft. The rolling bearing includes, for example, an inner ring that is externally fitted to a rotating shaft, an outer ring that is internally fitted to a housing, and a rolling element that is rotatably accommodated between the inner and outer rings. By applying a certain preload during the period, a predetermined bearing rigidity and stable rotation can be obtained.

  The fundamental effect of the preload is that the fulcrum of the rotating shaft, that is, the contact point between the rolling elements and the inner and outer rings is constantly subjected to an elastic compressive force, so that not only the clearance can be killed but also the rigidity against displacement is increased. As a means for applying such preload, for example, a so-called fixed position preloading method in which the axial position between the inner ring and the outer ring is set by applying a plane setting or a spacer or the like between the inner and outer rings to apply the preload; There is a so-called constant pressure preloading method in which a preload is applied between an inner ring and an outer ring using an elastic member such as a spring having a predetermined spring constant.

  However, in the case of the former fixed position preloading method, it is required to set the mounting accuracy including the processing accuracy of the rolling bearing, the rotating shaft and the housing with high accuracy. A dimensional change due to the difference affects the amount of preload, and it is difficult to stably secure a desired amount of preload.

  In the latter constant pressure preloading method, preload can be applied simply and stably without being affected by machining accuracy. However, when an impact load is applied to the rolling bearing, the elastic member bends and rotates. There was a problem that the shaft was displaced and it was difficult to maintain a constant preload.

  As a rolling bearing device that solves such a conventional problem, the one shown in FIG. 9A is known. The rolling bearing device 50 is fitted to a rotary shaft 51 connected to a drive motor (not shown) and fitting portions 51a and 51b formed on the rotary shaft 51 at a predetermined interval, and becomes a fixed member. The first and second ball bearings 53 and 54 that rotatably support the rotating shaft 51 with respect to the housing 52 and the housing 52 and the first ball bearing 53 are mounted, and the preload member 55 is held. Holder 56.

  As shown in FIG. 9B, the first and second ball bearings 53, 54 are extrapolated to the inner ring 57 that is fitted onto the fitting portion 51 a (51 b) of the rotating shaft 51, and the inner ring 57. The outer ring 58 is fitted in the housing 52, and the ball 59 is rotatably accommodated between the inner ring 57 and the outer ring 58.

  The holder 56 is fixed to the outer ring 58 of the ball bearing 53, and is provided with a positioning portion 56a that is disposed so as to be able to come in contact with and away from the engaging portion a formed in the housing 52, and an engaging portion 56b provided on the inner surface thereof. It is formed in an annular shape as a whole in a substantially U-shape. The preload member 55 is formed of a compression spring, a disc spring, or the like, and is held in the holder 56. One end of the preload member 55 is engaged with the engagement portion 56b. The preload member 55 is set with a predetermined urging force corresponding to the preload amount required for the first and second ball bearings 53, 54, and the other end is engaged with the engaging portion 52 a of the housing 52. ing. The preload member 55 applies a predetermined preload to the first ball bearing 53 in a state where the gap between the engaging portion 52a of the housing 52 and the positioning portion 56a of the holder 56 is maintained at L dimension. Similarly, a predetermined preload is applied to the second ball bearing 54 via the housing 52.

  In such a configuration, as shown in FIG. 9A, the preload member 55 urges the holder 56 in the direction of arrow A by its spring force to apply a predetermined preload to the first ball bearing 53. Simultaneously with the application, the second ball bearing 54 is applied with an urging force in the direction of arrow B through the housing 52 by the urging force of the preload member 55 in the direction of arrow A, and is similarly given a predetermined preload. Accordingly, the first and second ball bearings 53 and 54 are in a constant pressure preload state, and the rotary shaft 51 can be supported with high accuracy with respect to the housing 52.

When a load in the direction of arrow B is applied to the rotating shaft 51, the first ball bearing 53 is moved and urged in the same direction, and the holder 56 is moved in the same direction against the urging force of the preload member 55. Energize. Then, when the holder 56 is moved by the gap of the L dimension, the positioning portion 56 a comes into contact with the engaging portion 52 a of the housing 52 and the movement is restricted. As a result, the first and second ball bearings 53 and 54 are switched from the constant pressure preload state to the fixed position preload state by the action of the housing 52 and the holder 56, and can support the rotating shaft 51 with high accuracy. . As a result, both the first and second ball bearings 53 and 54 are provided with a stable constant pressure preload by the preload member 55, and when a load is applied, the positioning portion 56a of the holder 56 and the housing 56 are The fixed position preload is executed by the engaging portion 52a of the 52, and the rotation of the rotating shaft 51 is realized.
JP-A-9-217739

  However, in such a conventional rolling bearing device 50, the gap L between the engaging portion 52a of the housing 52 and the holder 56 corresponds to the axial play between the housing 52 and the first ball bearing 53, and basically. Since it is a constant pressure preload system, when the load is applied to the rotating shaft 51, the preload member 55 bends and the rotating shaft 51 is displaced, and during that time, it is difficult to maintain a constant preload.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a rolling bearing device that eliminates axial backlash and can always provide a stable preload over a long period of time.

  In order to achieve such an object, the invention according to claim 1 of the present invention includes an inner ring externally fitted to the rotary shaft, and an outer ring externally fitted to the inner ring via a plurality of rolling elements and fitted to the housing. A rolling bearing comprising: a rolling bearing comprising: a holder fixed to the housing; and a rolling bearing device comprising: a rolling bearing comprising: a rolling bearing comprising: A pusher having a pressing surface disposed opposite to the end surface of the outer ring, and an elastic member interposed between the pusher and the holder. A predetermined preload is applied to the rolling bearing by the urging force of the elastic member, and the holder and the pusher are engaged via a one-way clutch, and the pusher is engaged via the outer ring by the one-way clutch. Shah was made to prevent the axial movement.

  Thus, in the rolling bearing device incorporating the preload application device, the preload application device includes a holder fixed to the housing, and a pressing surface that is disposed facing the axial direction of the holder and abuts against the end surface of the outer ring. And an elastic member interposed between the pusher and the holder. The biasing force of the elastic member applies a predetermined preload to the rolling bearing, and the holder and the pusher are integrated with each other. Since the pusher is prevented from moving in the axial direction via the outer ring by this one-way clutch, the linear expansion coefficient of the material is changed due to wear due to aging or temperature change. It is possible to provide a rolling bearing device that eliminates axial play caused by the difference and can always provide a stable preload over a long period of time. As the rolling bearing, for example, a tapered roller bearing or an angular ball bearing can be used.

  According to a second aspect of the present invention, a cylindrical portion is formed on the pusher and the holder, and the cylindrical portion is fitted through a screw portion so that the pusher can advance and retract in the axial direction with respect to the holder. The elastic member is formed of a torsion coil spring or a spring, and the ends of the springs are respectively engaged with the pusher and the holder, and a rotational force is applied to the pusher by the spring. The pusher can press the outer ring through the pressing surface by the rotational force, and can apply a predetermined preload to the rolling bearing. On the other hand, when an external force is applied to the rolling bearing and an axial load is applied to the pusher via the outer ring, the pusher and the holder are screw-engaged. Will never retreat.

  According to a third aspect of the present invention, a tapered clutch surface having a gradually increasing diameter toward the rolling bearing side is formed on the outer periphery of the pusher, and between the clutch surface and the inner peripheral surface of the holder. A plurality of engagement elements are accommodated in an annular wedge-shaped space formed on the elastic member, and an elastic member is interposed between the holder and the holder that holds the engagement elements in a circumferentially equidistant manner. Since the engaging member is pressed against the wedge-shaped space by the elastic member via the cage, it is possible to reliably and instantaneously prevent the pusher from moving in the axial direction via the outer ring. It is possible to eliminate axial backlash and always apply a stable preload to the rolling bearing over a long period of time.

  According to a fourth aspect of the present invention, inclined cam surfaces are formed on the opposing end surfaces of the pusher and the holder, the cam surfaces are in contact with each other, and the elastic member is a torsion coil spring or a spring. Each end of the spring is locked to the pusher and the holder, and a rotational force is applied to the pusher by the spring, so that the pusher presses the outer ring through the pressing surface by the rotational force, A predetermined preload can be applied to the rolling bearing. On the other hand, when an external force is applied to the rolling bearing and an axial load is applied to the pusher via the outer ring, the pusher and the holder are engaged with each other on the cam surface, so that the reverse rotational force does not act on the spring. As long as the pusher does not retreat.

  According to a fifth aspect of the present invention, the rotating shaft is rotatably supported with respect to the housing by a pair of rolling bearings, and the preload applying device is arranged on the rolling bearing on the end side of the rotating shaft. If it is installed, when a thrust load is applied to the rotating shaft, the rotating shaft tries to displace in the axial direction, but one rolling bearing has no clearance and a preload corresponding to the thrust load is applied, The play on the opposite side of the rolling bearing is generated, but at this time, the play in the axial direction is instantaneously filled by the preload applying device, and the play in the axial direction can be prevented. Further, when the thrust load is released, the preload is divided into two and acts equally on each rolling bearing.

  A rolling bearing device according to the present invention includes an inner ring that is externally fitted to a rotating shaft, an outer ring that is externally inserted into the inner ring via a plurality of rolling elements, and is fitted to a housing, and the outer ring. In a rolling bearing device comprising a preload applying device that applies a preload to the rolling bearing by pressing in the axial direction, the preload applying device is opposed to the holder fixed to the housing and the axial direction of the holder. And a pusher having a pressing surface that contacts the end surface of the outer ring, and an elastic member interposed between the pusher and the holder. The rolling member is urged by the urging force of the elastic member. A predetermined preload is applied to the bearing, and the holder and the pusher are engaged via a one-way clutch, and the one-way clutch moves the pusher in the axial direction via the outer ring. A rolling bearing device that eliminates axial play caused by differences in the linear expansion coefficient of materials due to wear due to aging or temperature changes, and can always provide a stable preload over a long period of time. Can be provided.

  A rolling bearing having an inner ring externally fitted to the rotating shaft, and an outer ring inserted into the inner ring via a plurality of rolling elements and fitted in the housing; and the rolling by pressing the outer ring in the axial direction In a rolling bearing device comprising a preload applying device for applying preload to the bearing, the preload applying device is disposed opposite to a holder fixed to the housing and an axial direction of the holder, and contacts the end face of the outer ring. And a torsion coil spring interposed between the pusher and the holder, and a cylindrical portion is formed on the pusher and the holder, and the cylindrical portion is screwed. And the pusher is held so as to be movable forward and backward in the axial direction with respect to the holder, and the ends of the torsion coil springs are respectively locked to the pusher and the holder, Rotational force is imparted to the pusher by Ri coil spring.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a gear reducer incorporating a rolling bearing device according to the present invention, FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG. 3 is a preload applying device according to the present invention in a housing. It is explanatory drawing which shows the method of assembling.

  The gear reducer meshes with an input shaft 1, an output shaft 2 disposed parallel to the input shaft 1, a helical gear 3 fixed to the input shaft 1, and the helical gear 3. The helical gear 4 fixed to the output shaft 2, the pair of rolling bearings 5 and 6 that are fitted to the end of the input shaft 1 and support the helical gear 3 in a both-end supported state, and the output shaft 2 And a pair of rolling bearings 7 and 8 that support the helical gear 4 in a state of being supported at both ends, and are disposed on the respective end side of the input shaft 1 and the output shaft 2. 7 is provided with preload applying devices 9 and 9 for applying a preload.

  Since the input shaft 1 and the output shaft 2 are engaged by helical gears 3 and 4, when a rotational torque from a drive motor (not shown) acts on the input shaft 1, a thrust load is applied in the direction of the arrow as a reaction force. Be loaded. The rolling bearings 5 and 6 on the input shaft 1 side and the rolling bearings 7 and 8 on the output shaft 2 side are tapered roller bearings, and are arranged face to face (DF set) in order to apply the thrust load.

  As shown in an enlarged view in FIG. 2, the rolling bearing 6 (5, 7, 8) includes an inner ring 11 that is externally fitted to the end of the input shaft 1, and the inner ring 11 via a rolling element (conical roller) 12. And an outer ring 13 fitted in the housing 10. A tapered inner rolling surface 11a is formed on the outer periphery of the inner ring 11, and a large hook 11b and a small hook 11c are formed at both ends of the inner rolling surface 11a. On the other hand, a tapered outer rolling surface 13 a facing the inner rolling surface 11 a of the inner ring 11 is formed on the inner periphery of the outer ring 13. And the rolling element 12 is hold | maintained so that rolling is possible between both rolling surfaces 11a and 13a via the holder | retainer which is not illustrated in the state guided by the large collar 11b of the inner ring | wheel 11. The other rolling bearings 5, 7, 8 have substantially the same configuration as the rolling bearing 6 and will not be described in detail.

  The preload applying device 9 is disposed on the shaft end of the input shaft 1, that is, on the axially outer side of the rolling bearing 6, and includes a holder 14 and a pusher 15 inserted into the holder 14 via a screw portion. A torsion coil spring 16 interposed between the pusher 15 and the holder 14 is provided. A spiral spring may be used instead of the torsion coil spring 16.

  The holder 14 forms a lid member that closes the opening of the housing 10, and is fitted into the disk-shaped mounting portion 18 that is fixed to the housing 10 via the fixing bolt 17 and the opening of the housing 10, and has an inner circumference. And a cylindrical portion 19 in which a female screw 19a is formed. The mounting portion 18 is formed with a circular hole 18a that engages with a hook portion 16a on one end side of a torsion coil spring 16 described later.

  The pusher 15 is formed in a cup shape having a bottom portion 20, has a pressing surface 15 b in contact with the back surface 13 b of the outer ring 13 of the rolling bearing 6 at one end portion, and a male screw 15 a is formed on the outer periphery. The male screw 15a is engaged with the female screw 19a of the holder 14, and the pusher 15 is held so as to be movable forward and backward in the axial direction with respect to the holder 14 serving as a fixed side member. A circular hole 15c is formed in the bottom portion 20 of the pusher 15 so that the hook portion 16b on the other end side of the torsion coil spring 16 is engaged.

  The torsion coil spring 16 is accommodated in a state of being urged in an annular space formed by the pusher 15 and the holder 14. Therefore, the pusher 15 can be rotated in a predetermined direction by the urging force of the torsion coil spring 16, and the pusher 15 presses the outer ring 13 through the pressing surface 15b by this rotation, and a predetermined preload is applied to the rolling bearing 6. Can be granted. On the other hand, when an external force is applied to the rolling bearing 6 and an axial load is applied to the pusher 15 via the outer ring 13, the pusher 15 and the holder 14 are screw-engaged. The pusher 15 does not move backward unless the rotational force is applied.

  Here, in FIG. 1, when rotational torque acts on the input shaft 1 and a thrust load is applied to the input shaft 1 and the output shaft 2 in the directions indicated by the arrows, the input shaft 1 and the output shaft 2 are moved in the directions of the arrows. For example, the rolling bearing 5 of the input shaft 1 has no clearance and is given a preload corresponding to the thrust load. On the other hand, play occurs in the rolling bearing 6 on the opposite side. At this time, the play in the axial direction is instantaneously filled by the preload applying device 9. As described above, in this embodiment, when the preload is applied by the rotational torque acting on the input shaft 1, the preload applying device 9 is set in a state where the axial backlash is clogged. Therefore, the meshing state of the helical gears 3 and 4 can be kept good, the generation of vibration and noise can be suppressed, and the desired bearing rigidity can be maintained and the durability can be improved. Further, when the rotational torque of the input shaft 1 is stopped, the preload is divided into two and acts equally on the respective rolling bearings 5 and 6. In the rolling bearings 7 and 8 on the output shaft 2 side, a preload similar to that of the rolling bearings 5 and 6 on the input shaft 1 side is applied by the preload applying device 9 disposed on the rolling bearing 7 side.

  Here, the tapered roller bearing is applied to the rolling bearings 5 to 8, but the rolling bearing device according to the present invention is not limited thereto, and is, for example, an angular ball bearing using a ball for the rolling element 12. Also good. Further, the application is not limited to such a reduction gear, but can be applied to a rolling bearing device that supports a rotating shaft in another general industrial machine or an automobile.

Next, an assembly method of the preload applying device 9 will be described with reference to FIG.
First, the hook portion 16 a on one end side of the torsion coil spring 16 is locked in the circular hole 18 b of the holder 14, and the hook portion 16 b on the other end side is locked in the circular hole 15 c of the pusher 15. From this state, the pusher 15 is screwed into the holder 14 and the assembly of the pusher 15 and the holder 14 is completed in a state where the torsion coil spring 16 is compressed. In this state, the urging force of the torsion coil spring 16 applies a rotational force to the pusher 15 with respect to the holder 14 and tries to come out, so that the set pin 21 is inserted between the holder 14 and the pusher 15 and the pusher 15 rotates. Is blocking. Then, the preload applying device 9 is fitted in the opening of the housing 10, and the holder 14 is fixed to the housing 10 by the fixing bolt 17. Thereafter, the set pin 21 is removed, and the assembly of the preload applying device 9 is completed. In addition, after the set pin 21 is removed, it is preferable to close the pin hole 22 with a stopper plug 23 made of a screw or the like in order to prevent rainwater, dust or the like from entering the inside of the bearing from the pin hole 22 (FIG. 2).

  In this embodiment, as a preload applying device 9 for the rolling bearing 6, a holder 14, a pusher 15 that is screw-engaged with the holder 14, and a torsion coil whose ends 16a and 16b are engaged with the holder 14 and the pusher 15, respectively. Since the torsion coil spring 16 is mounted between the spring 16 and the torsion coil spring 16, the preload applying device 9 having a so-called one-way clutch function is obtained. Therefore, it is possible to prevent the pusher 15 from being displaced in the axial direction due to the load from the rolling bearing 6, and to prevent axial backlash caused by wear due to secular change or a difference in linear expansion coefficient of the material due to temperature change. Therefore, it is possible to provide a rolling bearing device that can always apply a stable preload over a long period of time.

  FIG. 4 is a cross-sectional view of an essential part showing a second embodiment of the rolling bearing device according to the present invention, FIG. 5A is a longitudinal cross-sectional view showing a pusher according to the present invention, and FIG. 4B is a cross-sectional view of FIG. FIG. 6 is a side view, FIG. 6 is an enlarged view of the main part of FIG. 4, FIG. 7 (a) is an explanatory view showing an assembling method of the preload applying device according to the present invention, and (b) is a method of assembling the preload applying device to the housing. It is explanatory drawing shown. Note that this embodiment is different from the first embodiment described above only in the configuration of the preload application device, and the same reference numerals are given to the same parts, parts, parts having the same functions as those of the first embodiment. A duplicate description will be omitted.

  The preload applying device 24 is disposed on the axially outer side of the rolling bearing 6, and includes a holder 25, a pusher 26 inserted in the holder 25, and an annular formed between the pusher 26 and the holder 25. A one-way clutch 27 interposed in the space and a disc spring 28 interposed between the pusher 26 and the holder 25 are provided.

  The holder 25 forms a lid member that closes the opening of the housing 10, and has a disk-shaped attachment portion 29 that is fixed to the housing 10 via the fixing bolt 17, and a cylindrical portion that is fitted in the opening of the housing 10. 30. An inner peripheral surface 30a of the cylindrical portion 30 forms a clutch surface of a one-way clutch 27 described later. A bolt hole 29 a is formed at the center of the attachment portion 29.

  As shown in an enlarged view in FIG. 5, the pusher 26 is formed in a cup shape having a bottom portion 31, has a flange portion 32 at one end portion, and has a tapered shape that gradually increases in diameter toward the rolling bearing 6 on the outer periphery. The clutch surface 33 is formed. The end surface of the flange portion 32 constitutes a pressing surface 26 a that contacts the back surface 13 b of the outer ring 13 of the rolling bearing 6, and a plurality (three in this case) of slits 32 a are formed at circumferentially equidistant positions of the flange portion 32. ing. A bolt hole 31 a is formed at the center of the bottom 31.

  As shown in an enlarged view in FIG. 6, a one-way clutch 27 is interposed in an annular wedge-shaped space 34 formed between the inner peripheral surface 30 a of the cylindrical portion 30 and the clutch surface 33 of the pusher 26 in the holder 25. Yes. The one-way clutch 27 is interposed between a plurality of engagement elements (balls) 35, a retainer 36 that retains the engagement elements 35 at equal intervals in the circumferential direction, and the retainer 36 and the holder 25. It is comprised with the elastic member 37 which consists of a coil spring etc. The elastic member 37 is interposed in a biased state, and always presses the engagement element 35 against the wedge-shaped space 34 via the retainer 36. Therefore, when the pusher 26 tries to displace to the rolling bearing 6 side (left direction in the figure) by the urging force of the disc spring 28, the one-way clutch 27 is released and can be moved. The one-way clutch 27 reliably and instantly prevents the movement even if it is going to be displaced axially outward (rightward in the figure). That is, a predetermined preload can be applied to the rolling bearing 6 by the disc spring 28, an external force acts on the rolling bearing 6, and a load in the axial direction (right direction in the figure) is applied to the pusher 15 via the outer ring 13. In this case, since the one-way clutch 27 is interposed between the pusher 26 and the holder 25, the pusher 26 does not move backward. Accordingly, it is possible to eliminate the backlash in the axial direction of the rolling bearing 6 and to always apply a stable preload over a long period of time.

Next, an assembly method of the preload applying device 24 will be described with reference to FIG.
First, the retainer 36 is pressed against the elastic member 37 by the pressing jig 38 in the axial direction (downward in the figure), and the engaging member 35 is separated from the wedge-shaped space 34 via the retainer 36. At this time, the pusher 26 is pressed in the same direction by the pressing jig 38 and the disc spring 28 is biased. In this state, the set bolt 39 is screwed into the bolt hole 31 a and the pusher 26 is held in the holder 25.

FIG. 7B shows a method of assembling the preload applying device 24 to the housing 10.
First, the preload applying device 24 is fitted into the opening of the housing 10, and the holder 25 is fixed to the housing 10 by the fixing bolt 17. Thereafter, the set bolt 39 is removed, and the assembly of the preload applying device 24 is completed. After the set bolt 39 is removed, it is preferable to close the bolt hole 29a with a stopper plug 40 made of a screw or the like in order to prevent rainwater, dust or the like from entering the bearing from the bolt hole 29a (see FIG. 4).

  In the present embodiment, as a preload applying device 24 for the rolling bearing 6, a holder 25, a pusher 26 inserted in the holder 25, and an annular wedge-shaped space 34 formed between the holder 25 and the pusher 26 are interposed. In the rolling bearing device, the pusher 26 is pressed against the rolling bearing 6 by a disc spring 28 that is provided with the mounted one-way clutch 27 and is biased between the holder 25 and the pusher 26. Abrasion due to secular change or axial backlash generated due to a difference in linear expansion coefficient of the material due to temperature change can be eliminated, and a stable preload can be constantly applied over a long period of time.

  Fig.8 (a) is principal part sectional drawing which shows 3rd Embodiment of the rolling bearing apparatus based on this invention, (b) is A arrow directional view of (a). Note that this embodiment is different from the above-described embodiment only in the configuration of the preload application device, and the same parts, parts, parts having the same function, and parts are denoted by the same reference numerals and redundant description is omitted. .

  The preload applying device 41 is disposed on the axially outer side of the rolling bearing 6, and includes a holder 42, a pusher 43 disposed to face the holder 42 in the axial direction, and between the pusher 43 and the holder 42. And a torsion coil spring 44 interposed therebetween. A spring instead of the torsion coil spring 44 may be used.

  The holder 42 is a lid member that closes the opening of the housing 10, and has a disk-like mounting portion 45 that is fixed to the housing 10 via the fixing bolt 17, and a cylindrical portion that is fitted into the opening of the housing 10. 46. A plurality of (here, three) inclined cam surfaces 42 a are formed on the end surface of the holder 42 at equal circumferential positions. The mounting portion 45 is formed with a circular hole 45a into which a hook portion 44a on one end side of a torsion coil spring 44 described later is engaged.

  The pusher 43 is formed in a disc shape, and has a pressing surface 43a that abuts the back surface 13b of the outer ring 13 of the rolling bearing 6 on one end surface, and a plurality of (three in this case) inclinations at circumferentially equidistant positions on the other end surface. The cam surface 47 is formed. The cam surface 47 is in contact with a cam surface 42 a formed on the end surface of the holder 42. Thereby, when the pusher 43 rotates, the pusher 43 can advance and retreat in the axial direction with respect to the holder 42 serving as the fixed member. A circular hole 43 b is formed in the end face of the pusher 43 to engage with the hook portion 44 b on the other end side of the torsion coil spring 44.

  The torsion coil spring 44 is accommodated in a state of being biased between the pusher 43 and the holder 42. Therefore, the pusher 43 can be rotated by the urging force of the torsion coil spring 44. By this rotation, the pusher 43 can press the outer ring 13 via the pressing surface 43a, thereby applying a predetermined preload to the rolling bearing 6. it can. On the other hand, when an external force is applied to the rolling bearing 6 and a load in the axial direction (rightward in the figure) is applied to the pusher 43 via the outer ring 13, the pusher 43 and the holder 42 are cam-engaged. The pusher 43 is not retracted unless a reverse rotational force acts on the coil spring 44.

  In the present embodiment, as a preload application device 41 for the rolling bearing 6, a holder 42, a pusher 43 disposed opposite to the holder 42 in the axial direction, and end portions of the holder 42 and the pusher 43 are respectively locked. A torsion coil spring 44 interposed between the holder 42 and the pusher 43 is formed with cam surfaces 42a and 47 that engage with each other, so-called one-way clutch function. A preload applying device 41 having Therefore, as in the above-described embodiment, in the rolling bearing device, the preload is always stable over a long period of time by eliminating wear due to secular change or axial backlash caused by the difference in the coefficient of linear expansion of the material due to temperature change. Can be granted.

  The embodiment of the present invention has been described above, but the present invention is not limited to such an embodiment, and is merely an example, and various modifications can be made without departing from the scope of the present invention. Of course, the scope of the present invention is indicated by the description of the scope of claims, and further, the equivalent meanings described in the scope of claims and all modifications within the scope of the scope of the present invention are included. Including.

  The rolling bearing device according to the present invention can be applied to a rolling bearing device that rotatably supports a rotating shaft such as an automobile or a general industrial machine device with respect to a housing.

It is a longitudinal cross-sectional view which shows the gear reducer with which the rolling bearing apparatus which concerns on this invention was integrated. It is a principal part enlarged view of FIG. It is explanatory drawing which shows the method of assembling the preload provision apparatus of FIG. 2 to a housing. It is principal part sectional drawing which shows 2nd Embodiment of the rolling bearing apparatus which concerns on this invention. (A) is a longitudinal cross-sectional view which shows the pusher of FIG. (B) is a side view of (a). It is a principal part enlarged view of FIG. (A) is explanatory drawing which shows the assembly method of the preload provision apparatus of FIG. (B) is explanatory drawing which shows the method of assembling a preload provision apparatus same as the above to a housing. (A) is principal part sectional drawing which shows 3rd Embodiment of the rolling bearing apparatus which concerns on this invention. (B) is an A arrow view of (a). (A) is a longitudinal cross-sectional view which shows the conventional rolling bearing apparatus. (B) is the principal part enlarged view of (a).

Explanation of symbols

1 ... Input shaft 2 ... Output shaft 3, 4, ..... Helical gears 5, 6, 7, 8 ... Rolling bearings 9, 24, 41 ... ... Preloading device 10 ... Housing 11 ... .... Inner ring 11a ..... Inner rolling surface 11b ... Oiso 11c ··········································· ......・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer ring 13a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Outer rolling surface 13b ・ ・ ・ ・ ・ ・ ・ ・ ・... Back 14, 25, 42 ... Holder 15, 26, 43 ... Pusher 15a ...・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Male thread 15b, 26a, 43a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Pressing surface 15c, 18a, 19b, 43b, 45a ..... Torsion coil springs 16a, 16b, 44a, 44b ..... Hook part 17 ...........・ ・ ・ ・ Fixing bolts 18, 29, 45 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Mounting parts 19, 30, 46 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Cylindrical part 19a ..... Internal thread 20, 31 ..... Bottom part 21 ...・ ・ ・ ・ ・ ・ Set pin 2 ······················ Pin hole 23, 40 ································· 27・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ One-way clutch 28 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Belleville springs 29a, 31a ・ ・ ・ ・ ・ ・..... Bolt hole 30a ..... Inner peripheral surface 32 ........... Flange part 32a ... Slit 33 ... Clutch surface 34 ... ..... Wedge shaped space 35 ......... engagement element 36 ...・ ・ ・ ・ ・ ・ Retainer 37 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Elastic member 38 ............ Pressure jig 39 ...・ ・ ・ Cam surface 50 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rolling bearing device 51 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Rotating shaft 51a, 51b ..... mating surface 52 ..... housing 52a ... ···························· Engagement parts 53, 54 ... .... Preloading member 56 ......... Holder 56a ... Positioning part 56b・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Engagement section 57 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・... Inner ring 58 ... Outer ring 59 ... Rolling element L ... ..... Gap between housing and holder

Claims (5)

A rolling bearing comprising an inner ring externally fitted to the rotating shaft, and an outer ring externally fitted to the inner ring via a plurality of rolling elements and fitted into the housing;
In a rolling bearing device comprising a preload applying device that applies a preload to the rolling bearing by pressing the outer ring in an axial direction,
The preload applying device is a holder fixed to the housing;
A pusher that is disposed opposite to the axial direction of the holder and has a pressing surface that contacts the end surface of the outer ring;
An elastic member interposed between the pusher and the holder in a biased state,
While applying a predetermined preload to the rolling bearing by the biasing force of this elastic member,
2. A rolling bearing device according to claim 1, wherein the holder and the pusher are engaged via a one-way clutch, and the pusher is prevented from moving in the axial direction via the outer ring by the one-way clutch.   A cylindrical portion is formed on the pusher and the holder, and the cylindrical portion is fitted via a screw portion, and the pusher is held so as to be movable back and forth in the axial direction with respect to the holder, and the elastic member is a torsion coil. The rolling bearing device according to claim 1, wherein the rolling bearing device includes a spring or a spring, and ends of the spring are respectively engaged with the pusher and a holder, and a rotational force is applied to the pusher by the spring.   A tapered clutch surface having a gradually increasing diameter toward the rolling bearing side is formed on the outer periphery of the pusher, and a plurality of wedge-shaped spaces formed between the clutch surface and the inner peripheral surface of the holder are provided. An elastic member is interposed between the holder and the holder that holds the engaging element in a circumferentially equidistant manner, and the elastic member is interposed by the elastic member via the holder. The rolling bearing device according to claim 1, wherein the engagement element is pressed against the wedge-shaped space.   Inclined cam surfaces are formed on the opposing end surfaces of the pusher and the holder, the cam surfaces are in contact with each other, and the elastic member is a torsion coil spring or a spring. The end of the spring is the pusher. The rolling bearing device according to claim 1, wherein a rotational force is applied to the pusher by the spring.   The rotary shaft is rotatably supported by a pair of rolling bearings with respect to the housing, and the preload applying device is disposed on the rolling bearing on the end side of the rotary shaft. Rolling bearing device.

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