JP5548018B2 - Pulley bearing device and belt drive device - Google Patents

Description

  The present invention relates to a pulley bearing device and a belt driving device, and more particularly to a shaftless end type pulley bearing device and a belt driving device provided with an automatic alignment mechanism.

  In the conventional pulley bearing device and belt driving device, a shaft support device such as a chain sprocket, a coupling or a speed reducer for power transmission is arranged on the shaft portion protruding from the belt width. .

  In addition, the driven pulley is provided with a screw part and a spring part with a shaft end as a take-up mechanism, especially for belt tension, and further, the meandering of the belt is adjusted by the "centering" operation. . A trapezoidal girder is provided at the center of the belt and at the ears, referred to as `` meandering-less '', etc., and a groove is provided on the pulley side. We could not escape the shortening of wear.

  Patent Document 1 describes a meandering correction device for a belt traveling device having self-aligning bearings at both ends of a shaft.

JP-A-6-247526

  In the conventional belt driving device described above, it is necessary to provide a mechanism for adjusting the belt at the shaft portion protruding from the belt width, and there is a limit to making the pulley bearing device and the belt driving device itself compact. It was. Furthermore, especially in food and semiconductor belt conveyors, the belt must be frequently removed and disinfected, sterilized, and washed. If the belt is adjusted each time, a considerable amount of work time is required.

  The present invention has been made in view of the above problems, and an object thereof is to provide a compact pulley bearing device and a belt driving device that are of a shaftless end type equipped with an automatic alignment mechanism, are easy to mount a belt, and are compact. .

  In order to achieve the above object, the pulley bearing device of the present invention includes a shaft having a spherical surface provided with a groove extending in the axial direction in the center, and an outer ring having a spherical inner surface fitted to the spherical surface of the shaft, A bolt that is screwed into the outer ring and has a tip inserted into the groove; a bracket that is composed of two cylindrical members and that clamps and fixes the outer ring from both sides at the inner step; and the bracket And a pulley that is fixed to both sides of the shaft, and when the bracket rotates, the shaft also rotates via the outer ring and the bolt, The pulley may be tilted at a certain angle with respect to the bracket and the outer ring.

  The pulley bearing device of the present invention further includes a semi-cylindrical belt retainer supported on the shaft via a bearing outside the bracket, and the belt retainer has a roller disposed along the circumference of the semi-cylindrical. A semi-cylindrical central circumferential end portion having a projecting portion projecting in a tangential direction, the projecting portion having an arc shape centering on the tilting center of the shaft, and a stopper receiving portion provided in the chassis It is characterized by abutting.

Furthermore pulley bearing device of the present invention, the transmission member is attached to the bracket, power to the heat transfer movement member is characterized in that it is transmitted.
Furthermore, the pulley bearing device of the present invention is characterized in that the bearing mounting portion of the chassis is movable in a belt extending direction applied to the pulley bearing device.

  Moreover, the belt drive device of the present invention includes the pulley bearing device described above and an endless belt that is put between the pulley bearing devices.

  According to the present invention, the pulley bearing device and the belt driving device are provided with the automatic alignment mechanism, so that the belt can be easily mounted and made compact.

It is a plane sectional view of the drive side pulley bearing device in the present invention. It is side surface sectional drawing of the drive side pulley bearing apparatus in this invention. It is a perspective view of the drive side pulley bearing device in the present invention. It is a perspective view which shows the outer ring and boss | hub bolt in this invention. It is a perspective view of the shaft in this invention. It is a perspective view of the belt retainer in the present invention. It is a perspective view of the driven pulley bearing device in the present invention.

  A mode for carrying out the present invention will be described.

  FIG. 1 is a plan sectional view of a drive side pulley bearing device 1 according to the present invention. FIG. 2 is a side sectional view of the driving pulley bearing device 1 according to the present invention. FIG. 3 is a perspective view of the drive-side pulley bearing device 1 according to the present invention. In FIG. 1, the left pulley 90 is not shown.

  In the drive unit chassis 10, bearing mounting portions 11 and 12 are provided in parallel with a predetermined interval. A bearing 16 is attached to each of the bearing attaching portions 11 and 12. In addition, the drive unit chassis 10 has two stopper receiving units 13 arranged vertically. The stopper receiving part 13 uses a material with low frictional resistance. For example, high-density polyethylene or hard fluororesin.

  The first bracket 20 and the second bracket 30 are separate members with the center line O as a boundary. The first bracket 20 is a cylinder, and has a thin portion 24 at one end and a thick portion 25 at the other end. The thick portion 25 is provided with a plurality of holes 21 having step portions on the outer periphery in parallel with the cylindrical axis direction, and an inner step portion 22 having a large side diameter on the thick portion 25 side is provided inside. Yes. The second bracket 30 is a cylinder, and has a thin portion 34 at one end and a thick portion 35 at the other end. The thick portion 35 has a plurality of screw holes 31 on the outer periphery parallel to the cylindrical axis direction, and an inner step 32 having a large diameter on the side surface on the thick portion 35 side is provided on the inner side.

  The outer ring 40 includes a first semicircular portion 41 and a second semicircular portion 45 as shown in FIG. The first semicircular portion 41 has a spherical inner surface 42 on the inner side and an arc-shaped surface 43 on the outer side. Moreover, it has one screw hole 44 that penetrates from the outside to the inside. The second semicircular portion 45 has a spherical inner surface 46 on the inner side and an R-shaped surface 47 on the outer side. The screw hole may be provided in the second semicircular portion 45 at a position 180 ° with the screw hole 44.

  As shown in FIG. 5, the shaft 50 has an inner portion 52 at a central portion, and shaft portions 51 extend at both ends. The inner portion 52 has a spherical surface 53 on the surface, partially extends in the axial direction, and has a circular arc-shaped groove portion 54 at the bottom.

  The boss bolt 60 has a screw portion 61 at one end and a rod-shaped tip portion 62 at the other end.

  The belt retainer 70 has a semi-cylindrical shape having an internal space. As shown in FIG. 6, the two belt members 71, a bearing mounting member 72, a stopper member 73, a pin-type roller 75, And a fixing pin 76. The semicircular members 71 serving as side surfaces are installed in parallel, and a stopper member 73 is installed between the semicircular members 71 on the side surfaces of the semicircular end portions of the two semicircular members 71, and the roller 75 includes two semicircular members. A plurality of (seven in FIG. 2) are installed along the circumference of the semicircular member 71 with the distance between 71 as the longitudinal direction. Similarly, a plurality of fixing pins 76 are installed along the circumference of the semicircular member 71 with the interval between the two semicircular members 71 as the longitudinal direction, and the strength between the semicircular members 71 is maintained. The roller 75 is installed so that the outer periphery of the roller protrudes slightly outside the outer periphery of the semicircular member 71. The pin roller 75 may be a bearing built-in type or a semicircular member 71 having a bearing. The stopper member 73 has a protrusion 73a at the center, and the protrusion 73a protrudes toward the tangential direction of the semi-cylinder. The protrusion 73a has an arcuate R shape, and its center coincides with the center of the sphere (center of tilting) of the spherical surface 53 of the inner portion 52 of the shaft 50 as viewed from above. At the center of the semicircular member 71, a semicircular bearing receiving portion 71a is provided. The bearing 78 is installed here, and the semicircular bearing mounting member 72 is mounted in accordance with the bearing receiving portion 71 a of the semicircular member 71 to fix the bearing 78.

  The pulley 90 has a cylindrical shape, has a stepped portion 91 on one side surface, and a taper member 92 can be mounted in the vicinity of the central axis. The outer diameter of the pulley 90 is substantially the same as the outer diameter of the semi-cylindrical portion of the belt retainer 70 connected by the outer circumferences of the plurality of rollers 75.

  The flange 100 has a stepped portion 101. Further, the outer diameter of the flange 100 is slightly larger than the outer diameter of the pulley 90 (d in FIG. 1). The size of d is at least larger than the thickness of the belt 3 (for example, about twice the thickness of the conveyor).

  A motor 110 is installed in the drive unit chassis 10, and power is transmitted to the sprocket 65 via the chain 111.

  Next, the overall arrangement of each element will be described. The spherical inner surface 42, 46 of the outer ring 40 is installed on the spherical surface 53 of the shaft 50 so as to be inscribed therein. Then, the screw portion 61 of the boss bolt 60 is screwed into the screw hole 44 of the outer ring 40, and the tip end portion 62 of the boss bolt 60 is inserted into the groove portion 54 of the shaft 50. On the other hand, the first bracket 20 and the second bracket 30 are attached by aligning the side surfaces on the thick portions 25 and 35 side, inserting bolts from the hole 21 side, screwing them in the screw holes 31, and tightening the screws. At this time, the R-shaped surfaces 43 and 47 of the outer ring 40 are inscribed and fitted to the inner stepped portions 22 and 32. The outer ring 40 is fixed to the brackets 20 and 30 by making the width of the outer ring 40 slightly larger than the width obtained by combining the inner stepped portions 22 and 32. The inner side of the bearing 16 attached to the bearing attachment portions 11 and 12 of the drive unit chassis 10 is attached to the outer periphery of the thin portion 24 of the first bracket 20 and the outer periphery of the thin portion 34 of the second bracket 30. A sprocket 65 is fixed to the outer periphery between the first bracket 20 and the second bracket 30. Note that a pulley, a spur gear, or a bevel gear may be provided instead of the sprocket 65, and transmission may be performed via another transmission member such as a belt, a gear, or a bevel gear.

  A belt retainer 70 is installed outside the brackets 20 and 30. Two bearings 78 are attached to the shaft portion 51 of the shaft 50, and a bearing receiving portion 71 a of the belt retainer 70 and a bearing attachment member 72 are installed on the outer periphery thereof. In addition, positioning bushes 80 are fixed to the shaft portion 51 of the shaft 50 on the outer side surfaces of the two bearings 78 to position the belt retainer 70. Further, the upper and lower two protrusions 73 a of the belt retainer 70 are configured to contact the two stopper receiving portions 13 provided in the drive unit chassis 10, respectively.

  Pulleys 90 are attached to the shaft portions 51 at both ends outside the belt retainer 70, and are fixed to the shaft portions 51 via taper members 92. In addition, the flange 100 is fixed to the outer end portion of the pulley 90 by combining the step portion 101 and the step portion 91.

  Next, the movement of the drive side pulley bearing device 1 will be described. The power of the motor 110 is transmitted to the sprocket 65 via the chain 111, and the brackets 20 and 30 and the outer ring 40 rotate. Furthermore, since the tip end portion 62 of the boss bolt 60 attached to the outer ring 40 is inserted into the groove portion 54 of the shaft 50, the shaft 50 also rotates. And the pulley 90 of the both ends fixed to the shaft 50 also rotates.

  On the other hand, the belt retainer 70 does not rotate because the upper and lower protrusions 73 a are in contact with the stopper receiving portions 13 of the drive unit chassis 10.

  The spherical inner surfaces 42 and 46 of the outer ring 40 and the spherical surface 53 of the shaft 50 are slidably fitted, and further, spaces 23 and 33 are provided between the brackets 20 and 30 and the shaft portion 51 of the shaft 50. Therefore, the shaft 50 can be tilted at a constant angle with respect to the outer ring 40 and the brackets 20 and 30. At this time, the pulley 90 fixed to the shaft 50 and the belt retainer 70 installed via the shaft 50 and the bearing 78 also tilt together. In the belt retainer 70, the upper and lower protrusions 73a are in contact with the stopper receiving part 13 of the drive unit chassis 10, respectively. However, since the center of R of the protrusion 73a coincides with the center of tilting, the above-mentioned contact is made. However, it is possible to swing along with the shaft 50. The direction of shake is the direction AB in FIG.

  FIG. 7 is a perspective view of the driven pulley bearing device 2 according to the present invention.

  The driven-side pulley bearing device 2 moves the handle 231 interlocking with the cam plate 230 in the direction C by the cam plate 230 provided in the driven portion chassis 210, thereby causing the pulley housing 220 attached to the tip of the rod 221 to The belt 3 can be moved in the direction D, which is a direction in which the belt 3 is loosened. The extension of the belt 3 is the reverse operation. For this reason, attachment, removal, and extension of the belt 3 are enabled. Further, the pulley 240 is urged by the spring 240 provided in the rod 221 in the direction in which the belt 3 is extended, and the tension of the belt 3 is maintained. This urging force can be changed by changing the position of the tension adjusting bush 245. The belt extension can be applied to a screw rod type or a hydraulic jack set, but a one-shaft type as shown in FIG. 7 is advantageous if priority is given to simple and safe operation.

  The pulley housing 220 has a bearing mounting portion 220a, and the bearing 16 can be installed. The brackets 20 and 30 are attached to this portion, and further, each component such as the outer ring 40, the shaft 50, the belt retainer 70, and the pulley 90 is attached. That is, components other than the sprocket 65, the chain 111, and the drive unit chassis 10 in FIG. 1 are attached. The pulley housing 220 is also provided with two stopper receivers 13 similar to those of the drive unit chassis 10 (not shown).

  Next, the driving of the entire belt 3 will be described. The belt driving device in which the driving pulley bearing device 1 and the driven pulley bearing device 2 are installed pulls the handle 231 and moves the pulley housing 220 in the pulling direction, and the belt 3 is moved to the pulley 90 of the two bearing devices 1 and 2. Call. And the handle 231 is pushed and the pulley housing 220 is extended. Then, tension is applied to the belt 3. As a result, the angle of the shaft 50 of the two bearing devices 1 and 2 is automatically adjusted in parallel by the automatic centering mechanism configured by the outer ring 40 and the shaft 50, etc., and can be driven without any special adjustment. You can start. Further, when the belt 3 comes into contact with the flange 100 during driving, the shaft 50 is tilted by the force and the centering is automatically performed. Therefore, the belt 3 does not run on the flange 100 and is not derailed. Does not have to be high. The belt 3 is driven by the rotation of the pulley 90 of the driving pulley bearing device 1, and the belt 3 is smoothly fed by the rotation of the roller 75 in the belt retainer 70. The plurality of rollers 75 only need to cover the semicircle (180 °) of the belt retainer 70. Further, the belt 3 can be removed by pulling the handle 231 and moving the pulley housing 220 in the pulling direction.

  The belt 3 can be an endless belt for a belt conveyor, and can be widely applied to resin belts, rubber belts, metal belts, and the like. The metal belt may be configured such that the belt retainer 70 is not required as long as the rigidity of the central portion can be maintained. However, considering the case of buckling, having the belt retainer 70 is effective even in the case of a metal belt.

  With these configurations, the drive-side pulley bearing device 1 and the driven-side pulley bearing device 2 can all be arranged inside the belt 3, and the overall configuration can be made compact.

DESCRIPTION OF SYMBOLS 1 Drive side pulley bearing apparatus 2 Driven side pulley bearing apparatus 3 Belt 10 Drive part chassis 11, 12 Bearing mounting part 13 Stopper receiving part 20 First bracket 22 Inner step part 30 Second bracket 32 Inner step part 40 Outer ring 41 First Semicircular portion 42 Spherical inner surface 45 Second semicircular portion 46 Spherical inner surface 50 Shaft 51 Shaft portion 53 Spherical surface 54 Groove portion 60 Boss bolt 65 Sprocket 70 Belt retainer 71 Semicircular member 73 Stopper member 73a Projection portion 75 Roller 90 Pulley 100 Flange 110 Motor 111 Chain 210 Follower chassis 220 Pulley housing 220a Bearing mounting part 221 Rod 230 Cam plate 231 Handle 240 Spring

Claims (5)

A shaft having a spherical surface in the center provided with a groove extending in the axial direction, an outer ring having a spherical inner surface that fits the spherical surface of the shaft, and a tip that is screwed into the outer ring and inserted into the groove. A bolt configured to include two cylindrical members, and a bracket that clamps and fixes the outer ring from both side surfaces at an inner step, a chassis that supports the bracket to a bearing mounting portion via a bearing, A pulley fixed on both sides of the shaft,
When the bracket rotates, the shaft also rotates through the outer ring and the bolt, and the shaft and the pulley can be tilted at a fixed angle with respect to the bracket and the outer ring. In the pulley bearing device according to claim 1,
A semi-cylindrical belt retainer supported on the shaft via a bearing outside the bracket;
The belt retainer has a roller disposed along the circumference of the semi-cylinder, and has a projecting portion protruding in a tangential direction at a circumferential end of the center of the semi-cylindrical, and the projecting portion has a tilt center of the shaft. A pulley bearing device having a circular arc shape as a center and abutting against a stopper receiving portion provided in the chassis. In the pulley bearing device according to claim 1 or 2,
A transmission member attached to said bracket, a pulley bearing and wherein the power is transmitted to the heat transfer movement member. In the pulley bearing device according to claim 1 or 2,
A pulley bearing device, wherein a bearing mounting portion of the chassis is movable in a belt extending direction applied to the pulley bearing device.   A belt drive device comprising: the pulley bearing device according to claim 3; the pulley bearing device according to claim 4; and an endless belt placed between the pulley bearing devices.

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