JP3533565B2 - Bearing seat of spline shaft and bearing mechanism using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing sheet for a spline shaft used in a light and medium load driving roller conveyor and the like, and a bearing mechanism using the same, and in particular, an outer periphery of a thin-walled steel pipe is adhesively coated. The present invention relates to a bearing sheet wound around a coating resin so as to rotatably support a spline shaft formed by alternately arranging axially concave and convex ridges in the circumferential direction, and a bearing mechanism using the same.

[0002]

2. Description of the Related Art Light and medium load drive roller conveyor 30
For the purpose of weight reduction and rust prevention, for example, as shown in FIG. 7, a support member 31a, a beam member 31b, and a girder member 31c made of a resin-coated steel pipe in which a synthetic resin is adhesively coated on the outer periphery of the thin-walled steel pipe are connected to the joint 32a. , 32b to join the frame 31
A plurality of conveyor rollers 34, each of which is formed of a similar resin-coated steel pipe and has a pulley 33 continuously provided at one end, are arranged in parallel between the girder members 31c of the frame 31 via bearings 35, and the outer periphery of the thin-walled steel pipe is formed. Axial groove 3 on the adhesive coated resin
6a and ridges 36b are alternately continuous in the circumferential direction, and the spline shaft 36 is rotatably supported by a bearing mechanism described later and is driven by a rotation drive device (not shown) to rotate the spline shaft 36. A belt 38 wound around a pulley 37 slidably fitted to a pulley 33 and an arbitrary pulley 33 of a conveyor roller 34, and a belt 39 wound between pulleys 33 of adjacent conveyor rollers 34.
It is configured to be transmitted to each conveyor roller 34 via.

Conventionally, in order to rotatably support the spline shaft 36, the spline shaft 36 is formed by injection molding of a synthetic resin such as polyacetal. The spline bush 40 which is provided on the surface and is slidably fitted to the spline shaft 36.
Is used. Further, a bearing mechanism 41 using the spline bush 40 includes a spline bush 40, a bearing 42 fitted in the spline bush 40,
A cage 43 for holding the bearing 42, and the bearing 42 fitted to the spline bush 40 is the cage 4
3, the holder 43 is attached to a bracket 44 formed integrally with the joints 32a, 32a of the frame 31 via bolts 45.

[0004]

However, since the conventional spline bush is rotatably supported by the retainer and is held through a bearing to prevent the spline from coming off, dimensional accuracy is required, A jig is required for each fitting. Therefore, there is a problem that the assembly becomes complicated, which in turn leads to a high cost. The spline bush may have a ring shape that can rotate on the spline shaft without forming a concave line and a convex line on the inner peripheral surface, and may be configured to be fitted to the cage without using a bearing. However, since the dimensional accuracy is still required for the fitting to the retainer to prevent the retainer from coming off, there is a similar problem. Further, since the bearing mechanism of the spline shaft has a large number of parts and dimensional accuracy is required, there is a problem that a jig is required for fitting the bearing, which makes the assembly complicated, which in turn leads to high cost. There is.

On the other hand, in the spline shaft, nylon having excellent hardness and abrasion resistance is adhesively coated on the outer circumference of a thin-walled steel pipe through an adhesive polymer composed of a modified polyolefin, and the coating resin is provided with an axial concave line and a convex line. Although the strips are alternately continuous in the circumferential direction, there is a problem that the coating resin peels off at the interface between the thin steel pipe and the adhesive polymer because water easily penetrates. In particular, in the spline shaft of a drive roller conveyor used outdoors or for agricultural and marine products, water often penetrates, which promotes peeling of the coating resin. Further, the torque acts at the connecting portion that connects the ends of the spline shaft with each other by a coupling or the like, and the engaging portion of the pulley that is fitted to the spline shaft, further promoting the peeling of the coating resin. .
Also, although nylon has excellent hardness and wear resistance,
Since the melt viscosity is low and the shrinkage rate is large, there is a problem that the dimensional accuracy and the stability of shape formation are low when molding into a spline shape. Therefore, as a coating resin for the spline shaft, a rubber-based adhesive that has less hardness and wear resistance than nylon but has excellent interface water resistance and does not cause peeling can be used in bonding with a thin-walled steel pipe. AAS, AB
There is a demand for a bearing mechanism that can use synthetic resins such as S, AES, and PETG.

Therefore, it is a first object of the present invention to provide a bearing sheet for a spline shaft having a simple structure and easy to assemble. Further, it is possible to provide a bearing mechanism for a spline shaft that has a small number of parts, is easy to assemble, and can widen the selection range of the coating resin for the spline shaft, and that can prevent wear of the coating resin. The second purpose.

[0007]

In order to solve the above-mentioned problems, a bearing sheet for a spline shaft according to the present invention has a coating resin adhesively coated on the outer periphery of a thin-walled steel pipe in which circumferential concave and convex ridges are alternately arranged in the circumferential direction. A bearing sheet wound around the outer periphery of the spline shaft to rotatably support the spline shaft, the bearing sheet having a bearing hole having an inner diameter slightly larger than the outer diameter of the spline shaft. large vertical dimension, than the depth of the concave lateral dimensions and spline shaft size of the same, such as the length of the outer periphery except for one ridges of the spline shaft
0.1 to 0.2 mm has a large thickness dimension, fit fits to the convex strip while wound around the spline shaft and laterally vent holes have Ri length by length <br/> rectangular bearing hole characterized by comprising the flexible resin sheets spaced apart to. On the other hand, the bearing mechanism of a spline shaft is a bearing mechanism that rotatably supports a spline shaft, which is formed by alternately arranging axially concave and convex ridges in a coating resin that is adhesively coated on the outer circumference of a thin-walled steel pipe. Te, and a cage having a bearing bore of inner diameter slightly larger than the outside diameter of the spline shaft, a large vertical dimension appropriately than the length of the bearing hole of the cage, and the length of the outer periphery except for one ridges of the spline shaft It has a 0.1 to 0.2 mm larger thickness dimension than the depth of the concave lateral dimension and the spline shaft of the same size as such,
And a bearing seat made of a punched hole of Ri by length have long rectangular Mari fit and the bearing hole fitted to the convex strip while wound around the spline shaft from spaced apart from the formed flexible resin sheet in the transverse direction, It is characterized in that the spline shaft is inserted into the bearing hole of the cage, which is rolled up in the lateral direction and inserted into the bearing hole of the cage.

The bearing sheet for the spline shaft has a structure in which a required number of rectangular holes are provided in a rectangular resin sheet, and the bearing sheet is mounted in a cage in a rolled state. It is done by inserting.

On the other hand, in the bearing mechanism of the spline shaft, the rotation of the spline shaft is supported by the sliding contact between the bearing seat and the bearing surface of the bearing hole of the cage, and the bearing seat protruding from the bearing hole of the cage. The outer diameter formed by both ends in the vertical direction is larger than the inner diameter of the bearing hole of the cage because it is wound around the convex line of the spline shaft.

The inner diameter slightly larger than the outer diameter of the spline shaft means a wall diameter 0.3 to 0.4 mm larger than the outer diameter of the spline shaft so as to allow sliding contact of the bearing seat. The length of the bearing hole of the cage is selected to be 0.4 to 0.7 times the outer diameter of the spline shaft. A vertical dimension that is appropriately larger than the length of the bearing hole of the cage means that the outer diameter increases when both ends of the bearing seat are wrapped around the spline shaft, and there is no whitening phenomenon caused by bending at a steep angle. Refers to the dimension with a margin. Flexible resin sheet, ultra high molecular weight polyethylene, polypropylene, nylon, polytetrafluoroethylene.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a perspective view showing an example of an embodiment of a bearing mechanism for a spline shaft according to the present invention and an enlarged perspective view in which a part of FIG.
3, 4 and 5 are plan / front and right side views, bottom / back and left side views showing an example of an embodiment of a bearing sheet for a spline shaft according to the present invention. It is a perspective view showing a usage state. The bearing mechanism 1 of this spline shaft is configured such that a spline shaft 2 formed by alternately forming axially recessed ridges 2c and ridges 2d in a coating resin 2b adhesively coated on the outer periphery of a thin steel pipe 2a in the circumferential direction is rotatable. The holder 3 is attached to a fixed system such as a frame, which will be described later, and a bearing sheet 5 that is rolled into a bearing hole 4 of the holder 3 and inserted.

The coating resin 2b of the spline shaft 2 is made of a synthetic resin such as AAS, ABS, AES, PETG or the like which can be bonded by a rubber adhesive having excellent water resistance at the interface with the thin steel pipe 2a. The depth of the groove 2c is 1 m
It is provided at about m.

The retainer 3 extends outward in the radial direction from a plate-shaped base 6 having an insertion hole 6a at its center and two locations separated by about 1/4 of the outer circumference of the base 6. One end of a rectangular plate for forming a joint in cooperation with each joint piece 7 which is curved in a semi-cylindrical shape and has an engaging portion 7a having a trapezoidal concave and convex shape at its end portion. The side is curved into a semi-cylindrical shape, and an engaging portion 8a having a trapezoidal shape that engages with the engaging portion 7a is provided at one end edge portion, and a bolt 9 is provided on the base 6.
And a bearing piece 4 having an inner diameter slightly larger (about 29 mm) than the outer diameter of the spline shaft 2 and a step portion 10a having a different diameter on the outer periphery,
Moreover, the cylindrical member 10 has a length 0.4 to 0.7 times the outer diameter of the spline shaft 2 and is inserted into the insertion hole 6a of the base 6 by welding or the like. And the cage 3
Is attached to a post member 11 and a beam member 12 of a frame, which will be described later, via a joint composed of joint pieces 7 and 8.

The bearing sheet 5 is appropriately larger than the length of the bearing hole 4 of the cage 3, that is, the vertical dimension A has a margin that does not cause the whitening phenomenon caused by bending the bearing sheet 5 at a steep angle. one of the outer periphery except for the projections 2d length the same like the size of the spline shaft 2, for example, the outer periphery of the spline shaft 2 from the length of one of which the ridges 2d width min size of minus of transverse dimension B, and from about 0.1mm larger thickness T than the depth of the concave 2c of the spline shaft 2
Together with a, and spaced apart a drain hole 5a of about 10mm length pray shape than the length of the Mari fit and retainer 3 of the bearing hole 4 fits in the ridge 2d in a state wound around the spline shaft 2 in the transverse direction And is made of a sheet of synthetic resin having a small friction coefficient such as ultra-high molecular weight polyethylene, polypropylene, nylon, and polytetrafluoroethylene .

The bearing mechanism 1 of the spline shaft 2 is
The bearing sheet 5 is rolled in the lateral direction and inserted into the bearing hole 4 of the cage 3, and the spline shaft 2 is fitted in the bearing sheet 5 with the ridge 2d thereof in the hole 5a of the bearing sheet 5. 5 through the hole 5a of the spline shaft 2
It is configured to be inserted according to the ridge 2a.

The bearing mechanism 1 of the spline shaft 2 described above is
For example, as shown in FIG. 6, for the purpose of weight reduction and rust prevention,
The pillar member 11 and the beam member 1 made of a resin-coated steel pipe in which a synthetic resin such as AAS or ABS is adhesively coated on the outer circumference of the thin-walled steel pipe.
2. Frame 1 with spar material 13 spliced together via joint 14
5 is made of the same resin-coated steel pipe, and a large number of conveyor rollers 17 in which pulleys 16 are continuously provided at one end are used as bearings 18.
Via the brackets 13 of the frame 15 in parallel with each other, the supporting member 11 and the beam member 12 of the frame 15 in the light and medium load drive roller conveyor 19 have the joint piece 7 of the cage 3 and the joint piece. 8 and a bolt 9 and is driven by a rotation driving device (not shown).
Is rotated around the pulley 20 slidably fitted to the spline shaft 2 and the pulley 16 of the optional conveyor roller 17, and between the pulley 16 of the adjacent conveyor roller 17. It is transmitted to each conveyor roller 17 via the belt 22.

In the above-described embodiment, the case where the bearing mechanism 1 of the spline shaft 2 is applied to the light and medium load drive roller conveyor 19 has been described, but the present invention is not limited to this. Any device having a shaft as a drive shaft can be applied. Further, the cage 3 is not limited to the case in which the cage 3 is composed of the base 6 and the tubular member 10 having the bearing hole 4 inserted into the insertion hole 6a thereof.
The plate-shaped base 6 may be formed by drawing the bearing hole 4 by pressing, or may be a block-shaped base 6 having a bearing hole. Furthermore, the coating resin 2b of the spline shaft 2 is made of AAS that can be adhered by a rubber adhesive having excellent water resistance at the interface,
Not limited to synthetic resin such as ABS, nylon may be used when used in a place where there is no risk of water penetration.

[0018]

As described above, according to the bearing sheet of the spline shaft of the present invention, the structure is only that the required number of rectangular holes are provided in the rectangular resin sheet, and the bearing sheet for the cage is formed. Since the mounting is performed by inserting it into the bearing hole in a rolled state, it is possible to have a simple structure, and
It can be easily assembled.

Further, according to the bearing mechanism of the spline shaft, the rotation of the spline shaft is supported by a simple structure of sliding contact between the resin sheet and the bearing surface of the bearing hole of the cage,
In addition, since the outer diameter of both ends of the resin sheet protruding from the bearing hole of the retainer in the longitudinal direction is larger than the inner diameter of the bearing hole of the retainer, there is no risk of the resin sheet coming out of the retainer, which prevents the resin sheet from coming off. No parts are needed, the number of parts can be reduced compared to the conventional one, assembly can be done easily, and the selection range can be expanded without sticking to the friction coefficient of the spline shaft coating resin,
As a result, the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of an embodiment of a bearing mechanism for a spline shaft according to the present invention.

FIG. 2 is an enlarged perspective view in which a part of FIG. 1 is broken and omitted.

FIG. 3 is a plan view, a front view, and a right side view showing an example of an embodiment of a bearing sheet for a spline shaft according to the present invention.

FIG. 4 is a view showing a bottom surface, a rear surface, and a left side view of a bearing sheet of the spline shaft of FIG.

FIG. 5 is a perspective view showing a usage state of the bearing sheet of the spline shaft of FIG.

6 is a perspective view of a main part of a drive roller conveyor including the bearing mechanism of the spline shaft of FIG.

FIG. 7 is a perspective view of a main part of a drive roller conveyor including a conventional spline shaft bearing mechanism.

[Explanation of symbols]

1 Bearing mechanism 2 spline shaft 2a Thin-walled steel pipe 2b coating resin 2c concave line 2d convex stripe 3 cage 4 bearing holes 5 Bearing seat 5a hole 6 base 6a insertion hole 10 Cylindrical member

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-10-103452 (JP, A) JP-A-7-291414 (JP, A) JP-A-3-97414 (JP, A) JP-A-8- 135659 (JP, A) JP-A-4-321813 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16C 17/00-17/26 F16C 33/00-33/28 B65G 13/11

Claims (2)

(57) [Claims] 1. A bearing sheet wound around an outer periphery of a thin-walled steel pipe so as to rotatably support a spline shaft formed by alternately arranging axially concave and convex ridges in a coating resin that is adhesively coated on the outer periphery. a is a large vertical dimension appropriately than the length of the bearing hole of the retainer slightly with a bearing hole of a larger inner diameter than the outer diameter of the spline shaft, the length of the outer periphery except for one ridges of the spline shaft and the like It has a lateral dimension of about 0.1 mm and a thickness dimension 0.1 to 0.2 mm larger than the depth of the concave line of the spline shaft, and it fits into the convex line while being wound around the spline shaft and the length of the bearing hole. Ri spline shaft bearing sheet, characterized by comprising a vent hole of the rectangular has a length from the spaced to form the flexible resin sheet in the transverse direction. 2. A bearing mechanism for rotatably supporting a spline shaft formed by alternately arranging axially recessed ridges and ridges in a circumferential direction in a coating resin adhesively coated on the outer circumference of a thin-walled steel pipe,
A cage having a bearing hole having an inner diameter slightly larger than the outer diameter of the spline shaft, a vertical dimension appropriately larger than the length of the bearing hole of the retainer, and an outer peripheral length of the spline shaft excluding one protrusion.
And has a transverse dimension and 0.1 to 0.2 mm larger thickness dimension than the depth of the concave stripes of the spline shaft size of the same, etc., Mari fit and the bearing hole fitted to the convex strip while wound around the spline shaft was formed of the drain hole of the rectangle Ri has length by length spaced apart in the lateral direction
And a bearing seat made of flexible resin sheet, the bearing sheet inserted through the bearing hole of the retainer rounded laterally, that is configured to be inserted by fitting the projections in piercing the spline shaft The bearing mechanism of the spline shaft.