JP2000062937A - Roller device and roller conveyer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the idle running of the inner rings of bearings and a shaft, and to stabilize the bearing performance for a long period. SOLUTION: Near the both ends of a shaft 2 where the journalled parts 4 are formed by providing recesses 3 at both end by a necking process, a pair of bearings 5 and 5 is installed. The bearings 5 and 5 are installed to the installing parts 16 and 16 at both ends of an about cylindrical roller 15, and journalled rotatable to the shaft 2. Between the shaft 2, and the inner rings 7 and 7 of the bearings 5 and 5, a rotation regulating body 18 with the elasticity is pressed in to one side recess 3 of the journalled part 4. The axial centers of the shaft 2 and the inner rings 7 and 7 are deviated, and press-contacted to each other to prevent the idle running. A cap 20 with the elasticity is installed to the journalled parts 4 and 4 by abutting to the inner rings 7 and 7. The journalled parts 4 and 4 are supported to a pair of conveyer frames 25, provided in parallel, and they are made rotatable by contacting a belt 27 rotated by a driving means to a roller 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller device for rotatably supporting a roller portion on a shaft via a bearing and a roller conveyor using the roller device.

[0002]

2. Description of the Related Art Conventionally, a roller device of this type has a pair of conveyor frames 31 as shown in FIGS.
They are arranged in parallel along the gap, and both ends are supported by a pair of conveyor frames 31, respectively, that is, backrest processing, that is, a part of the circumferential surface located in the radial direction is recessed into an arcuate concave shape. A shaft 33 having a shaft support portion 32 is provided.
At both ends of the shaft 33, a ring-shaped inner ring portion 34 and an outer ring portion 35 are located closer to the intermediate portion than the shaft support portion 32.
A bearing 37 such as a press bearing or a JIS bearing is provided concentrically with the rolling element 36 interposed therebetween. Further, the roller device 38 has a bearing 37,
A substantially cylindrical roller portion 39 is provided rotatably with respect to the shaft 33 by fitting 37 to the inner circumferences of both ends. further,
Synthetic resin caps 40 and 40 are fitted to the shaft support portions at both ends.

Further, the shaft supporting portions 32 are respectively supported by the conveyor frames 31, are arranged in parallel with the pair of conveyor frames 31, and the belt 41 which is rotated by a driving means such as an electric motor is provided on the outer peripheral surface of the roller portion 39. The rollers 41 are brought into contact with each other and the roller portion 39 is rotated by the driving of the electric motor, and the object to be conveyed is conveyed.

[0004]

By the way, in the conventional roller device 38 shown in FIG. 7 and FIG. 8, the shaft support portions 32, 32 are formed in order to fit the bearings 37, 37 to both ends of the shaft 33.
32 is formed into a backrest so that the outer diameters of the bearings 37, 37 are substantially the same as or slightly smaller than the inner diameter of the inner ring portion 34 of the bearings 37, 37. Therefore, for example, when a JIS bearing having a relatively large rotational resistance is used for the bearing 37, and when the roller portion 39 is rotated in a state where the rotating load of the rotating belt 41 is small, the inner ring portion of the bearing 37, 37 is rotated. The inner ring parts 34, 34 of the bearings 37, 37 slide on the shaft by sliding between the shafts 33, 34.
There is a risk of idling against 33. Therefore, the idle rotation between the shaft 33 and the inner ring portions 34, 34 of the bearings 37, 37 makes it impossible to obtain smooth rotation due to wear of iron powder or the like, rusting, or rattling due to wear. There is a risk that smooth rotation may not be obtained and noise may occur.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a roller device and a roller conveyor capable of suppressing idle rotation between an inner ring portion of a bearing and a shaft and obtaining stable bearing characteristics for a long period of time. With the goal.

[0006]

According to a first aspect of the present invention, there is provided a roller device including a shaft having shaft supporting portions at both ends, a roller portion having a cylindrical outer periphery, an inner ring portion fitted into the shaft, and an inner ring portion of the inner ring portion. A pair of bearings that are attached to the roller portion coaxially with respect to the ring portion, include an outer ring portion that is rotatable with respect to the inner ring portion, and support the roller portion rotatably with respect to the shaft; A rotation restricting body that is disposed between the shaft and the inner ring portion of the bearing and restricts relative rotation of the shaft and the inner ring portion.

In the vicinity of both ends of the shaft having shaft supporting portions at both ends, an inner ring portion rotatably fitted to the shaft and an outer ring portion fitted to the roller portion are coaxially provided. Bearings that rotatably support the shaft and the rotation restricting body that restricts relative rotation between the shaft and the inner ring portion of the bearing. , It is possible to prevent the bearing characteristics from being deteriorated due to idle rotation between the inner ring portion of the bearing and the shaft.

According to a second aspect of the present invention, there is provided the roller device according to the first aspect, wherein the rotation restricting member is disposed at a portion in a circumferential direction between the inner ring portion of the shaft and the bearing. And the center axis of the inner ring portion are eccentric.

The rotation restricting body is disposed at a portion in the circumferential direction between the inner ring portions of the shaft and the bearing, and the central axis of the shaft and the central axis of the inner ring portion are eccentric. The inner ring portion of the bearing is brought into close contact, and idling between the inner ring portion of the bearing and the shaft can be suppressed with a simple configuration.

According to a third aspect of the present invention, in the roller device according to the first or second aspect, the rotation restricting body is formed of an elastic member.

Since the rotation restricting body is formed of an elastic member, even if the outer diameter of the shaft and the inner diameter of the inner ring portion of the bearing vary, the shaft and the inner ring portion of the bearing are evenly adhered to each other. Is obtained,
It is possible to suppress idling between the inner ring portion of the bearing and the shaft with a simple configuration.

According to a fourth aspect of the present invention, in the roller device according to any one of the first to third aspects, the shaft support has a recess into which the rotation restricting body is inserted.

Since the shaft support portion is provided with the concave portion into which the rotation restricting body is inserted, it becomes easy to dispose the rotation restricting body between the shaft and the inner ring portion of the bearing, and the manufacturability is improved.

According to a fifth aspect of the present invention, there is provided the roller device according to the fourth aspect, wherein the shaft support portion has a backrest processed.

Further, since the shaft supporting portion is processed into the back, the concave portion into which the rotation restricting body is inserted can be easily formed, and the manufacturability is improved.

A roller device according to a sixth aspect of the present invention is the roller device according to any one of the first to fifth aspects, further comprising an elastic cap for covering the outer peripheral surface of the shaft support portion.

Since the shaft supporting portion is provided with the elastic cap for covering the outer peripheral surface, for example, the shaft supporting portion can be supported on the conveyor frame while suppressing the generation of noise, and the inner ring portion of the shaft and the bearing can be supported. The rotation restricting body provided therebetween is prevented from falling off.

A roller device according to a seventh aspect is the roller device according to the sixth aspect, wherein the rotation restricting body is integrally provided on the cap.

Since the rotation restricting body is provided integrally with the cap, the rotation restricting body is provided between the shaft and the inner ring portion of the bearing when the cap is attached, which reduces the number of manufacturing steps and improves manufacturability. .

The roller conveyor according to claim 8 is provided with a pair of conveyor frames, and a plurality of roller conveyors are arranged side by side along the pair of conveyor frames, and the shaft supporting portions at both ends are attached to the conveyor frames. 7. The roller device according to any one of 7 above.

Since a plurality of roller portions of the roller device according to any one of claims 1 to 7 are arranged in parallel along a pair of conveyor frames, for example, rotation by the driving force transmitting means for transmitting the driving force from the driving means. Even if the roller part is rotated under a light load, the idling of the shaft of the roller device and the inner ring part of the bearing is restricted, so stable bearing characteristics can be obtained for a long period of time, and the rotation of the roller part of the roller device is prevented. Generation of noise due to noise is suppressed.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a roller body as a roller device, and the roller body 1 has a shaft 2 having a substantially cylindrical shape. Both ends of the shaft 2 are respectively processed into a backrest, that is, a concave portion 3 in which a part of the circumferential surface located in the radial direction is depressed in an arcuate concave shape is provided so as to face each other, and a shaft supporting portion 4 is formed. .

In the vicinity of both ends of the shaft 2, bearings 5 and 5 are attached so as to be located on the center side of a predetermined distance from both ends. These bearings 5 and 5 are substantially cylindrical and have an inner ring portion 7 having an inner rolling groove 6 on the outer peripheral surface along the circumferential direction, and a substantially cylindrical shape having a smaller axial dimension than the inner ring portion 7 and a large diameter. Between the inner ring portion 7 and the outer ring portion 9 and the inner ring portion 7 and the outer ring portion 9 each having an outer rolling groove 8 on the inner circumferential surface along the circumferential direction. A plurality of spherical rolling elements 10, 10 located in the outer rolling groove 8 of the ring portion 9 and interposed, a spacer 11 for holding a gap between the rolling elements 10, 10 and an outer ring portion 9 are fitted on the inner peripheral side. The inner ring portion 7 and the outer ring portion 9 are covered by a cover body 12 that covers the inner ring portion 7 and the outer ring portion 9, and the rolling of the rolling element 10 causes the inner ring portion 7 and the outer ring portion 9 to relatively rotate. And
The cover body 12 is provided at one edge with a locking portion 13 projecting like a flange in the outer peripheral direction, and the bearing 5 is attached so that the locking portion 13 is located on the end side of the shaft 2. In addition, the cover body 12 is formed with an opening 14 for injecting a lubricant or the like without coming into contact with the inner ring portion 7.

Since the inner diameter of the inner ring portion 7 of the bearing 5 is such that the shaft 2 can be fitted and mounted,
The outer diameter of the shaft support portion 4 of the shaft 2 is equal to or larger than the outer diameter of the shaft support portion 4, that is, substantially the same as or slightly larger than the outer diameter of the shaft support portion 4.

On the other hand, 15 is a roller portion, and this roller portion 15
Is formed in a substantially cylindrical shape, and at both ends, fitting portions 16 are formed, the end edges of which are bent inward in an arc shape. And
The roller portion 15 has bearings 5 and 5 attached to the shaft 2 fitted into fitting portions 16 and 16 at both ends, and is rotatably supported on the shaft 2.

Between the shaft 2 and the inner ring portion 7 of the bearing 5, a member having elasticity such as synthetic resin or hard rubber is located in one of the recesses 3 of the shaft supporting portion 4 of the shaft 2. The rotation regulating bodies 18 formed in a columnar shape are respectively interposed. These rotation restricting bodies 18 are, as shown in FIG.
The shaft center of the shaft support portion 4 is press-fitted so as to be located in a part of the circumferential direction in one of the recesses 3 so as to bias the shaft center of the inner ring portion 7 of the bearing 5 in a direction eccentric to the shaft center of the shaft 2. The outer peripheral surface of the support portion 4 is in pressure contact with the inner peripheral surface of the inner ring portion 7 of the bearing 5.

Further, the shaft supporting portions 4 at both ends of the shaft 2 are
4 is provided with caps 20 and 20 each having a cylindrical shape with a bottom and made of an elastic member such as synthetic resin. These caps 20 and 20 have an inner diameter dimension into which the end of the shaft 2 can be fitted, and the end edge on the opening side when fitted to the shaft support 4 is the end edge of the inner ring portion 7 of the bearing 5. Is formed to have an axial dimension that substantially abuts against the. Further, a flange portion 21 projecting in the outer diameter direction is provided at the edge of the cap 20 on the opening side.

In the roller body 1, the flange portion 21 of the cap 20 is brought into contact with the facing surfaces of the pair of conveyor frames 25 so that the axial movement of the roller body 1 is restricted.
The shaft supporting portions 4 provided with the caps 20 are engaged with and supported by the bearing recesses 26 provided in the 25, and are arranged in parallel along the pair of conveyor frames 25.

Further, the outer peripheral surface of the roller portion 15 of the roller body 1 arranged on the conveyor frame 25 is wound around a plurality of pulleys arranged on the conveyor frame 25 by driving means such as an electric motor (not shown). An endless belt-shaped belt 27 as a drive transmission means that rotates around is contacted, and the rotational driving force of the drive means is transmitted through the rotating belt 27 to form a roller conveyor 28 in which the roller portion 15 rotates. .

Next, the operation of this embodiment will be described.

First, when the roller body 1 is assembled, the shaft 2 is inserted into the inner peripheral side of the roller portion 15. Then, the bearings 5 and 5 are attached to both ends of the shaft 2, respectively. That is, the shaft supporting portion 4 of the shaft 2 is fitted into the inner peripheral side of the inner ring portion 7 of the bearing 5, and the outer ring portion 9 of the bearing 5 is fixed to the locking portion 13 of the cover body 12 to be the roller portion.
The bearings 5 and 5 are fitted into the fitting portion 16 so that the end portion of the inner ring portion 7 comes into a predetermined position from the end portion of the shaft 2 by abutting on the end portion of the fitting portion 16 of the shaft 2. Assemble integrally with. In addition, since the shaft supporting portion 4 is processed to have the back, the shaft supporting portion 4 of the shaft 2 can be easily fitted into the inner ring portion 7 of the bearing 5.

Next, the rotation restricting body 18 is press-fitted into the one concave portion 3 of the shaft supporting portion 4. By the press-fitting of the rotation restricting body 18, the shaft center of the shaft support part 4 is biased in a direction eccentric from the shaft center of the inner ring part 7 of the bearing 5, and the outer peripheral surface of the shaft support part 4 of the shaft 2 becomes a bearing. The inner ring portion 7 of 5 is pressed against the inner peripheral surface of the inner ring portion 7.

Thereafter, the cap 20 is fitted to the shaft support portion 4 of the shaft 2 until the end edge on the opening side substantially abuts on the end edge of the inner ring portion 7 of the bearing 5, so that the roller body 1 is assembled and formed. To do.

Then, while the flange portion 21 of the cap 20 is brought into contact with the facing surfaces of the pair of conveyor frames 25, the shaft support portions 4 are engaged with and supported by the bearing recesses 26 of the pair of conveyor frames 25, respectively. A belt 27 previously hung on the outer peripheral surface of the roller portion 15 is brought into contact with the conveyor frame 25 and the roller bodies 1 are arranged in parallel.
28 is assembled and formed.

When the object to be conveyed is conveyed, the belt 27 is rotated by driving the driving means of the roller conveyor 28, and the outer peripheral surface of the roller 27 comes into contact with the belt 27.
The roller portion 15 rotates with the outer ring portion 9 of the bearing 5.

Here, in the bearing 5, the outer ring portion 9 causes the shaft 2 and the inner ring portion 7 by the rolling of the rolling element 10.
The shaft 2 supported by the conveyor frame 25 and the inner ring portion 7 whose inner peripheral surface is in close contact with the shaft 2 are rotated while being supported by the conveyor frame 25. do not do.

By the way, when the roller portion 15 is rotated in a state where the rotational load is small, for example, the roller portion 15 is rotated at a high speed, the outer ring portion 9 and the inner ring portion 7 of the bearing 5 due to the rolling of the rolling elements 10. If the rotation resistance of the shaft is relatively large, such as a JIS bearing, there is a risk of slipping between the shaft 2 and the inner ring portion 7, but the rotation regulator 18 is press-fitted between the shaft 2 and the inner ring portion 7. As a result, the shaft 2 and the inner ring portion 7 can be prevented from idling because they are in close contact with each other. As a result, rattling, iron powder, rust, and the like due to wear are generated in the idle rotation between the shaft 2 and the inner ring portion 7 of the bearing 5.
Noise such as rattling can be prevented, stable rotation can be obtained for a long time, and the life of the roller body 1 can be extended.
Good bearing characteristics can be obtained for a long time, and maintenance can be done easily at low cost.

In order to prevent this idling, a rotation restricting body 18 is interposed between the shaft 2 and the inner ring portion 7 at a part in the circumferential direction, and the center axis of the shaft 2 and the center of the inner ring portion 7 are arranged. Since the shafts are made eccentric and brought into close contact with each other, idling can be easily prevented with a simple configuration.

Further, since the recess 3 is formed by carrying out the backing up to the portion where the inner ring portion 7 of the bearing 5 is located, and the rotation restricting body 18 is inserted into this recess 3, the rotation restricting body 18 is easily formed.
Can be easily located with a simple structure between the shaft 2 and the inner ring portion 7 at a position in the circumferential direction, which can improve the manufacturability and the bearing 5 can be easily attached to the shaft 2. It is also possible to improve the assembly workability.

Since the rotation restricting body 18 is made of elastic synthetic resin or the like, the outer diameter of the shaft 2 and the inner peripheral surface of the inner ring 7 of the bearing 5 are different for each roller body 1 and the outer peripheral surface of the shaft 2 and the bearing. Even if the clearance between the inner ring portion 7 and the inner peripheral surface of the inner ring portion 7 varies, the close contact state of the shaft 2 and the inner ring portion 7 of the bearing 5 can be reliably obtained, and idling can be prevented with a simple configuration.

Further, since the elastic cap 20 is provided on the shaft supporting portion 4 which is supported by the conveyor frame 25, it serves as a cushioning material for supporting the shaft and prevents noise from being generated.
The rotation restricting body 18 interposed between the shaft 2 and the inner ring portion 7 of the bearing 5 can be prevented from falling off.

In the above embodiment, the roller body 1 used for the roller conveyor 28 has been described.
Any structure in which the shaft 2 and the roller portion 15 are relatively rotatable by the bearing 5 can be applied.

Further, the rotation restricting body 18 is made of an elastic synthetic resin or the like. For example, the rotation restricting body 18 is formed in the shape of a metal wedge and is driven between the shaft 2 and the inner ring portion 7 of the bearing 5. It may be provided in the.

Then, the shaft 2 is processed into the back to form the concave portion 3 and the rotation restricting body 18 is press-fitted into the concave portion 3 for explanation. However, the concave portion 3 is simply formed by pressing, or the shaft 2 and the bearing 5 are formed. If it is not difficult to interpose the rotation restricting body 18 with the inner ring portion 7, the recess 3
Need not be provided.

The cap 20 is attached after the rotation restricting body 18 is interposed between them.
As shown in FIG. 5, a rotation restricting body 18 is integrally and substantially integrally provided on the edge of the cap 20 facing the inner ring portion 7 so as to project.
It is also possible to interpose a rotation restricting body 18 that is provided so as to protrude during the attachment. According to the configurations shown in FIGS. 3 to 6, the mounting of the cap 20 and the interposition of the rotation restricting body 18 can be performed in one operation, the number of manufacturing steps can be reduced, and the manufacturability can be improved.

[0047]

According to the roller device of the first aspect of the present invention, the shaft and the inner ring are provided between the inner ring portion and the shaft of the bearing which is mounted near both ends of the shaft and rotatably supports the roller portion. Since the rotation restricting body that restricts the relative rotation of the bearing portion is provided, it is possible to prevent the bearing characteristics from being reduced due to idle rotation between the inner ring portion of the bearing and the shaft.

According to the roller device of the second aspect, in addition to the effect of the roller device of the first aspect, the rotation restricting body is disposed between the shaft and the inner ring portion of the bearing at a part in the circumferential direction, Since the central axis of the shaft and the central axis of the inner ring portion are eccentric to closely contact the shaft and the inner ring portion, idling between the inner ring portion and the shaft can be suppressed with a simple configuration.

According to the roller device of the third aspect, in addition to the effect of the roller device of the first or second aspect, since the rotation restricting body is formed by the elastic member, the outer diameter of the shaft and the inner ring portion of the bearing are formed. Even if the inner diameter of the bearing varies, the shaft and the inner ring portion of the bearing can be evenly adhered to each other, and idling between the inner ring portion and the shaft can be suppressed with a simple configuration.

According to the roller device of the fourth aspect, in addition to the effect of the roller device of the first aspect, a recess for inserting the rotation restricting body is provided in the shaft support portion.
The rotation regulator can be easily interposed between the shaft and the inner ring portion of the bearing, and the manufacturability can be improved.

According to the roller device of the fifth aspect, in addition to the effect of the roller device of the fourth aspect, since the shaft supporting portion is subjected to the backrest processing, it is possible to easily form the concave portion into which the rotation restricting body is inserted, and the manufacturability is improved. Can be improved.

According to the roller device of the sixth aspect, in addition to the effect of the roller device according to any one of the first to fifth aspects, since the shaft supporting portion is provided with the elastic cap for covering the outer peripheral surface, for example, the conveyor. The shaft support portion can be supported by the frame while suppressing noise generation, and the rotation restricting body provided between the inner ring portion of the shaft and the bearing can be prevented from falling off.

According to the roller device of the seventh aspect, in addition to the effect of the roller device of the sixth aspect, the rotation restricting body is integrally provided on the cap, so that the cap is attached and the shaft and the inner ring portion of the bearing are mounted together. A rotation regulator can be attached, the number of manufacturing steps can be reduced, and manufacturability can be improved.

According to the roller conveyor of claim 8,
A plurality of roller portions of the roller device according to any one of claims 1 to 7 are arranged side by side along a pair of conveyor frames, so that a rotational load is small due to, for example, a driving force transmitting means for transmitting a driving force of a driving means. Even if the roller portion is rotated by, the idling of the shaft of the roller device and the inner ring portion of the bearing can be prevented, stable bearing characteristics can be obtained for a long period of time, and the generation of noise due to the rotation of the roller portion of the roller device can be prevented. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a roller device showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a relationship between the shaft and bearings of the same.

FIG. 3 is a side view of a cap showing another embodiment of the present invention.

FIG. 4 is a plan view of the same.

FIG. 5 is a rear view of the same.

FIG. 6 is a front view of the same.

FIG. 7 is a cross-sectional view showing a conventional roller device.

FIG. 8 is an explanatory diagram showing a relationship between the shaft and bearings of the same.

[Explanation of symbols]

1 Roller body as a roller device 2 shafts 3 recess 4 shaft support 5 bearings 7 Inner ring 9 Outer ring part 15 Roller part 18 Rotation control body 20 caps 25 conveyor frame

Claims (8)

[Claims] 1. A shaft having shaft-supporting portions at both ends, a roller portion having an outer periphery of a cylindrical shape, an inner ring portion fitted into the shaft, and attached to the roller portion coaxially with the inner ring portion. A pair of bearings for rotatably supporting the roller portion with respect to the shaft, the outer ring portion being rotatable with respect to the inner ring portion, and being located between the shaft and the inner ring portion of the bearing. A roller device provided with a rotation restricting body that restricts relative rotation of the shaft and the inner ring portion. 2. The rotation restricting body is disposed at a portion in the circumferential direction between the inner ring portions of the shaft and the bearing, and eccentric the central axis of the shaft and the central axis of the inner ring portion. The roller device according to claim 1, wherein: 3. The roller device according to claim 1, wherein the rotation restricting body is formed of an elastic member. 4. The roller device according to claim 1, wherein the shaft supporting portion has a recess into which the rotation restricting body is inserted. 5. The roller device according to claim 4, wherein the shaft support portion has a backrest processed. 6. The roller device according to claim 1, further comprising an elastic cap that covers an outer peripheral surface of the shaft support portion. 7. The roller device according to claim 6, wherein the rotation restricting body is provided integrally with the cap. 8. A pair of conveyor frames, a plurality of which are arranged in parallel along the pair of conveyor frames,
A roller conveyor comprising the roller device according to any one of claims 1 to 7, wherein each shaft support portion at both ends is attached to each conveyor frame.