JP4925684B2 - Thrust roller bearing assembly method - Google Patents

Description

The present invention also relates to the assembly how the thrust roller bearings.

  A thrust roller bearing is a roller in which a plurality of rollers arranged radially between two parallel race rings are held in pockets formed radially at equal intervals in the circumferential direction of an annular cage. The wheel may be substituted with a receiving surface for the part of the device to be incorporated.

  There are two types of annular cages, one made of metal and one made of resin. Usually, a metal cage is formed by joining two annular metal plates having pocket holes to each other at an inner periphery and an outer periphery. In the center portion where the pocket hole is formed, a gap is formed between the two, and the roller is held by the pocket hole edge of the two metal plates spaced apart from each other (for example, see Patent Document 1). The cage made by injection molding or the like is integrally molded, and on the opposite circumferential side surfaces of the pocket, there are two protrusions projecting toward the pocket side, and the rollers are held between the upper and lower protrusions. (For example, refer to Patent Document 2). Each of Patent Documents 1 and 2 is a double-row thrust roller bearing in which rollers are held in two rows on the inner peripheral side and the outer peripheral side in each pocket of the cage.

  When assembling the roller and cage of the thrust roller bearing as described above integrally, a metal or resin cage is arranged perpendicular to the axis, and one or two rows of rollers are placed horizontally, such as a hammer. A press-fitting tool is used to press-fit into the pocket from above. There is also a thrust roller bearing assembly device in which a cage is intermittently rotated around a vertical axis and a roller is press-fitted with a press-fitting tool into a pocket that is sequentially intermittently rotated at one place in the circumferential direction.

JP 2004-44655 A (FIG. 1-5) Japanese Patent Laying-Open No. 2005-61614 (FIG. 1-5)

  As described above, the conventional thrust roller bearing assembly method and assembly apparatus in which the cage is arranged vertically and the horizontally oriented roller is press-fitted into the pocket from above with a press-fitting tool are easy to roll the horizontally oriented roller. Since the posture becomes unstable, there is a problem that a press-fitting mistake into the pocket is likely to occur, and it takes time to assemble and the assembly time becomes long. In particular, in the case of a double row thrust roller bearing, a large number of rollers are press-fitted into the pocket and a roller having a small length-to-diameter ratio tends to roll irregularly, so that the assembly time is further increased.

An object of the present invention hardly occurs pressed misses to the pockets of the rollers is to provide an assembly how the thrust roller bearing can shorten the assembly time.

In order to solve the above problems, the thrust roller bearing assembling method of the present invention is configured such that a roller is press-fitted into a plurality of pockets formed radially at equal intervals in the circumferential direction of an annular cage, and the roller is held. In the method of assembling the thrust roller bearing for assembling the cage integrally, the annular cage is arranged horizontally on the shaft, intermittently rotated around the horizontal shaft, and a roller housing member is arranged on one side of the cage that rotates intermittently. The roller storage member is radially formed with a plurality of groove-shaped storage portions whose outer diameter side is opened and whose inner diameter side is closed by a cylindrical rod at the same circumferential interval as the pocket of the cage. The annular roller storage member is provided with a hole in the bottom of each storage portion, and the annular roller storage member is disposed on one side of the cage so that the storage portions face the pockets. Spacing around the horizontal axis, along with the cage Rolling and rolling the roller storage member at the upper position of the roller storage member, and the roller is inserted into the storage portion in the vertical direction from the outer diameter side, and the roller stored in the storage portion and supported by the flange To simultaneously press-fit into the pocket of the cage by a press-fitting tool that is pushed into the hole in the bottom of the storage unit at a position where the storage unit is rotated at least one pitch from the roller insertion position. It was adopted.

  That is, an annular cage is arranged horizontally on the shaft, intermittently rotated around the horizontal axis, and on one side of the cage that rotates intermittently, facing one pocket that rotates to a predetermined upper position. A roller storage member having a groove-shaped storage portion with an open upper end side where the rollers are stored vertically, and a hole is provided in the bottom of the groove-shaped storage portion. Roller is inserted vertically into the storage part from above, and when the pocket of the cage that rotates intermittently faces the storage part in which the roller is inserted, it is pressed into the hole provided in the bottom of this storage part. And press the roller stored in the storage unit into the pocket of the cage facing this storage unit, so that the roller press-fitted into the pocket is held in the storage unit in a stable vertical orientation. Makes it difficult to make a press-fitting error in the pocket and shortens the assembly time. And it can be so.

  The roller storage member is radially formed with the groove-shaped storage portions opened on the outer diameter side at the same circumferential intervals as the pockets of the cage, and the holes are provided at the bottoms of these storage portions. The annular roller storage member is disposed on one side of the retainer so that the storage portions face the pockets, and the annular roller storage member is intermittently mounted around the horizontal axis together with the retainer. The roller is inserted vertically from the outer diameter side into the storage part that is rotated and rotated at the upper part of the roller storage member, and the roller stored in the storage part is inserted into the storage part. A roller inserted into the storage unit and a roller from the storage unit by being press-fitted into the pocket of the cage by a press-fitting tool pushed into the hole in the bottom of the storage unit at a position rotated at least 1 pitch from the position. Simultaneous extrusion at different intermittent rotation positions Done, it is possible to further reduce the assembly time.

  The cage and the storage member are intermittently rotated by the first servo motor, and the press-fitting tool is intermittently inserted into the hole at the bottom of the storage portion by a linear motion cam that reciprocates by converting the rotation of the second servo motor. The second servo is synchronized with the intermittent rotation of the first servo motor and the reciprocating motion of the linear cam obtained by converting the rotation of the second servo motor. The motor can be continuously rotated, and the intermittent rotation speed of the cage and the storage member can be increased to shorten the time pitch of roller insertion and extrusion into the storage unit, thereby further reducing the assembly time. .

  The method of assembling each thrust roller bearing described above is a double-row thrust roller bearing in which the thrust roller bearing is press-fitted into each pocket of the retainer two by two on the inner peripheral side and the outer peripheral side, It is suitable for one in which the two rollers on the inner diameter side and the outer diameter side are simultaneously press-fitted into each pocket.

  The cage can be a resin cage made of resin.

  In the method of assembling the thrust roller bearing of the present invention, an annular cage is arranged horizontally on the shaft, intermittently rotated around the horizontal shaft, and rotated to a predetermined upper position on one side of the cage that rotates intermittently. A roller storage member having a groove-shaped storage portion with an open upper end side where a roller is stored vertically so as to face one incoming pocket and having a hole provided at the bottom of the groove-shaped storage portion. When the roller is inserted vertically into the storage part of this roller storage member from above and the pocket of the cage that rotates intermittently faces the storage part in which the roller is inserted, Pressing the press-fitting tool into the hole provided in the bottom and press-fitting the roller stored in the storage part into the pocket of the cage facing this storage part makes the roller press-fitted into the pocket a stable posture in the vertical direction. So that it can be held in the storage section. And less likely to occur the press mistake to Tsu door, it is possible to shorten the assembly time.

  The roller storage member is annularly formed with a groove-shaped storage portion having a radially open outer diameter side at the same circumferential interval as the cage pocket, and a hole is provided at the bottom of each storage portion. This annular roller storage member is placed on one side of the cage so that each storage part faces each pocket, and is rotated intermittently around the horizontal axis together with the cage. Rollers are inserted vertically into the storage section that comes to the upper position of the roller storage member from the outer diameter side, and the rollers stored in this storage section are rotated at least 1 pitch from the roller insertion position. At the same time, by pressing into the cage pocket with a press-fit tool that is pushed into the hole in the bottom of the storage unit, the roller can be inserted into the storage unit and the roller can be pushed out of the storage unit at the same intermittent rotation position. The assembly time can be further reduced .

  The cage member is intermittently rotated by the first servo motor, and the press-fitting tool is intermittently inserted into the hole at the bottom of the storage portion by a linear motion cam that reciprocates by converting the rotation of the second servo motor. By pushing in and synchronizing the intermittent rotation of the first servo motor and the reciprocating motion of the linear motion cam converted from the rotation of the second servo motor (two-axis complement), the second servo motor is continuously operated. The intermittent rotation speed of the cage and the storage member can be increased, the time pitch of inserting and extruding rollers into the storage portion can be shortened, and the assembly time can be further shortened.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIGS. 1A and 1B show an example of a thrust roller bearing assembled by the method and apparatus for assembling a thrust roller bearing according to the present invention. This thrust roller bearing is a double row in which rollers 4 are held in two rows on the inner peripheral side and the outer peripheral side in a plurality of pockets 2 formed radially at equal intervals in the circumferential direction of the annular cage 1. This is a thrust roller bearing, and the cage 1 is integrally formed of resin. On the opposite circumferential side surfaces of the pocket 2, protrusions 3 that protrude to the pocket side and hold the rollers 4 are provided at two locations on the upper and lower sides. Yes.

  2 to 7 show an embodiment of the above-described thrust roller bearing assembly apparatus. As shown in FIG. 2, the assembling apparatus is configured so that the retainer 1 faces the annular roller storage member 11 (to be described later) and a shaft unit with the axial center aligned, and the support unit 20 faces the front side of the support unit 20. The intermittent rotation unit 40 that intermittently rotates the cage 1 set on the support unit 20 together with the roller storage member 11, and the rear surface side of the support unit 20, and the chute 12 on the roller storage member 11. Are basically composed of a press-fit unit 50 for press-fitting the rollers 4 into the respective pockets 2 of the cage 1, and these are arranged on the same base 10.

  As shown in FIGS. 3 (a) and 3 (b), the roller storage member 11 has a groove-shaped storage portion 11a whose outer diameter side is opened at the same circumferential interval as the pocket 2 of the cage 1. A hole 11b that is formed in a radial shape and into which a tip of a press-fitting bar 57 as a press-fitting tool described later is pushed is provided at the bottom of each storage portion 11a. The inner diameter side of each storage portion 11 a is closed by a flange 11 c at a radial position substantially equal to the inner diameter end of the pocket 2 of the cage 1, and the two rollers 4 are stored vertically in the radial direction. .

  As shown in FIGS. 4 and 5, the support unit 20 includes a casing 21 in which a hollow horizontal shaft member 22 having an enlarged tip is rotatably supported by bearings 23 a and 23 b, and the diameter of the horizontal shaft member 22 is increased. The roller storage member 11 is fixed to the outer diameter surface of the tip portion so as to rotate together with the horizontal shaft member 22 with the groove-shaped storage portion 11a facing the front side. 1 is set with each pocket 2 facing each storage portion 11a.

  The roller housing member 11 is connected to the outer diameter side of the roller housing member 11 at the tip end of the chute 12, and is provided with a roller feeding member 24 provided with a feeding hole 24a that opens to the outer diameter side of the housing portion 11a at one place in the circumferential direction. 21 is attached. Moreover, the cap 25 provided with the unevenness | corrugation 25a engaged with the unevenness | corrugation 43a of the clamp member 43 of the intermittent rotation unit 40 mentioned later at the front-end | tip of the horizontal shaft member 22 is attached.

  The hollow horizontal shaft member 22 is fitted with a centering member 28 urged rearward by a coil spring 26 and pushed forward by a cylinder 27 attached to a frame 51 of a press-fit unit 50 described later. In addition, three centering claws 31 that are biased so as to rotate outwardly by a spring 30 attached to the cap 25 are provided in the enlarged diameter portion of the horizontal shaft member 22 with the pin 29 as a fulcrum. It has been. The three centering claws 31 are arranged radially at a phase of 120 ° and press the inner diameter surface of the cage 1 so as to center the roller storage member 11 fixed to the horizontal shaft member 22. Set. When exchanging the cage 1, the centering member 28 is pushed forward by the cylinder 27, whereby each centering claw 31 is rotated inward, and the setting of the cage 1 is released.

  The chute 12 is formed of a flexible tube, the base end is connected to the discharge port of the high-speed component supply device 13 above, and the rollers 4 aligned by the component supply device 13 are supplied at high speed from above in the axial direction. Is done. The roller 4 supplied to the chute 12 is opened to the storage portion 11a that rotates to the position immediately before the uppermost portion of the roller storage member 11 that rotates intermittently through the insertion hole 24a of the roller insertion member 24. Two are put vertically from the outer diameter side.

  A press-fitting bar 57 of the press-fitting unit 50 is horizontally inserted into the upper portion of the casing 21 of the support unit 20, and the tip thereof is provided at the bottom of the storage portion 11 a that rotates to the uppermost position of the storage member 11. The two rollers 4 which are pushed into the holes 11b and are put into the storage portion 11a at a position one pitch before the holes 11b are pushed forward and pressed into the pockets 2 of the opposing cage 1. The press-fitting bar 57 is pressed by a spring 58 on a projecting portion 57a projecting at a right angle and is urged rearward, and the rear end thereof is intermittently pressed by a reciprocating press-fitting hammer 56, as will be described later. It is pushed into the hole 11b. Accordingly, the roller 4 is inserted into the storage portion 11a at the position one pitch before the uppermost portion of the roller storage member 11, and the press-fitting into the pocket 2 is simultaneously performed by pushing the roller 4 at the storage portion 11a at the uppermost position. be able to.

  As shown in FIG. 2, the intermittent rotation unit 40 has a clamp member 43 attached to a first servo motor 41 horizontally directed to the front side of the support unit 20 via a speed reducer 42. Guided by the rail 44, it is advanced and retracted by a cylinder (not shown) toward the front side of the support unit 20, and retracted when replacing the retainer 1 attached to the support unit 20, Advances when roller 4 is press-fitted into 1.

  When the intermittent rotation unit 40 advances, the unevenness 43a on the front surface of the clamp member 43 engages with the unevenness 25a on the cap 25 of the horizontal shaft member 22, and the annular portion 43b on the front surface of the clamp member 43 is connected to the support unit 20. Clamp the front surface of the set cage 1 so as to press it down. The servo motor 41 intermittently rotates the clamp member 43 based on the output of the sensor 61 that detects the reciprocating motion of the linear motion cam 54 driven by the second servo motor 52 of the press-fitting unit 50 to be described later. The horizontal shaft member 22 to which the roller storage member 11 and the cage 1 are attached is intermittently rotated so that the roller 4 is intermittently synchronized with the timing of pushing out the rollers 4 of the storage portion 11a.

  As shown in FIGS. 6 and 7, the press-fitting unit 50 engages an eccentric roller 53 provided on the output shaft 52 a of the servo motor 52 attached to the frame 51 with a groove 54 a provided on the linear cam 54. The reciprocating motion of the linear motion cam 54 is connected to the linear motion cam 54 via a universal joint 55 and the rear end of the press-fitting bar 57 is moved by a press-fitting hammer 56 guided by a guide hole 51 a provided in the frame 51. It pushes forward intermittently, pushes the tip of the press-fit bar 57 into the hole 11b at the bottom of the storage portion 11a, and presses the rollers 4 stored in the storage portion 11a into the pocket 2 of the cage 1 two by two. is there.

  Two guide bars 59 are attached to both sides of the linear cam 54, and reciprocating motion is guided through guide holes 51 b provided in the frame 51. A damper cylinder 60 for absorbing abnormal pressure input acting on the press-fitting hammer 56 is also attached to the linear cam 54. The frame 51 is provided with a sensor 61 for detecting the reciprocating motion of the linear cam 54 and synchronizing the intermittent rotation of the servo motor 41 with the reciprocating motion of the linear cam 54.

  In the above-described embodiment, the thrust roller bearing to be assembled is a double row thrust roller bearing using a resin cage, but the thrust roller bearing assembly method and assembly apparatus according to the present invention is a single row thrust roller bearing. The present invention can also be applied to those using a bearing or a metal cage.

a is a side view showing an example of a thrust roller bearing assembled by the method and apparatus for assembling a thrust roller bearing according to the present invention, and b is a partially enlarged perspective view of a. Longitudinal front view showing an embodiment of an assembly apparatus for a thrust roller bearing a is an external perspective view showing the roller storage member of FIG. 2, and b is a cross-sectional view taken along line IIIb-IIIb of a. A longitudinal front view showing the support unit of FIG. Side view of FIG. Vertical front view showing the press-fitting unit of FIG. Sectional drawing along the VII-VII line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cage 2 Pocket 3 Protrusion 4 Roller 10 Base 11 Roller storage member 11a Storage part 11b Hole 11c 鍔 12 Chute 13 Parts supply device 20 Support unit 21 Casing 22 Horizontal shaft member 23a, 23b Bearing 24 Roller input member 24a Input hole 25 Cap 25a Concavity and convexity 26 Coil spring 27 Cylinder 28 Centering member 29 Pin 30 Spring 31 Centering claw 40 Intermittent rotation unit 41 Servo motor 42 Reducer 43 Clamp member 43a Concavity and convexity 44 Guide rail 50 Press-fit unit 51 Frames 51a and 51b Guide hole 52 Servo Motor 52a Output shaft 53 Eccentric roller 54 Linear motion cam 54a Groove 55 Universal joint 56 Press fit hammer 57 Press fit bar 57a Overhang portion 58 Spring 59 Guide bar 60 Damper cylinder 61 Sensor

Claims (4)

In a method of assembling a thrust roller bearing in which rollers are press-fitted into a plurality of pockets formed radially at equal intervals in the circumferential direction of an annular cage, and the rollers and the cage are assembled together, the annular cage is pivoted. Place horizontally, rotate intermittently around the horizontal axis, and place the roller storage member on one side of the cage that rotates intermittently, and the roller storage member is spaced in the same circumferential direction as the pocket of the cage A plurality of groove-like storage portions whose outer diameter side is open and whose inner diameter side is closed with a cylindrical ridge are formed radially, and each of the storage portions has an annular shape with a hole provided at the bottom thereof. An annular roller storage member is disposed on one side of the cage so that the storage portions face the pockets, and is rotated intermittently around a horizontal axis together with the cage. In the storage part that comes to the upper position of the storage member The operation of throwing the roller vertically from the outer diameter side, and the roller housed in the housing part and supported by the scissors at the position where the housing part is intermittently rotated by 1 pitch or more from the roller insertion position, A thrust roller bearing assembling method characterized in that the press-fitting tool pushed into the hole in the bottom of the storage portion simultaneously performs the press-fitting operation into the pocket of the cage . The cage and the storage member are intermittently rotated by the first servo motor, and the press-fitting tool is intermittently inserted into the hole at the bottom of the storage portion by a linear motion cam that reciprocates by converting the rotation of the second servo motor. 2. The thrust roller bearing according to claim 1 , wherein the thrust roller bearing according to claim 1 is configured to synchronize the intermittent rotation of the first servo motor and the reciprocating motion of the linear cam obtained by converting the rotation of the second servo motor. Assembly method. The thrust roller bearing is a double row thrust roller bearing in which the rollers are press-fitted into each pocket of the cage in two at the inner peripheral side and the outer peripheral side, and the inner diameter side and the outer diameter are inserted into each pocket. The thrust roller bearing assembly method according to claim 1 or 2, wherein the two rollers on the side are press-fitted simultaneously. The method of assembling a thrust roller bearing according to any one of claims 1 to 3 , wherein the cage is a resin cage made of resin.

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