JP2003336644A - Roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roller bearing provided with a pin type retainer in which processing is easy, the number of parts is not increased and positioning of both annular side plates against the pin is easy. <P>SOLUTION: The roller bearing has the pin type retainer 2 for retaining a plurality of cylindrical hollow rollers 1 rollably clamped between an inner ring and an outer ring at a predetermined space. The pin type retainer 2 comprises first and second annular side plates 3, 4 coaxially arranged opposed to each other; and a plurality of pins 5 of which both ends are bonded to these both annular side plates 3, 4 and the hollow rollers 1 are rotatably supported onto outer peripheries of the respective pins 5. Both ends of the pin 5 are bonded to the first and second annular side plates 3, 4 by thread-engaging a parallel male screw part 6 with a screw hole 8 of the first annular side plate 3 by press-fitting the press-insertion shaft part 7 to a fitting hole 9 of the second annular side plate 4. Butting stepped parts 10, 11 provided at a base part side of the parallel male screw part 6 and the press-insertion shaft part 7 are butted to corresponding inner side surfaces of the first and second annular side plates 3, 4. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller bearing, and more particularly to improvement of a roller bearing in which a hollow roller is held between inner and outer rings by a pin type cage.

[0002]

2. Description of the Related Art As a type of large-sized roller bearings used in steelmaking equipment and papermaking machines, the "rollers" that are rolling elements are made hollow, and pins are inserted into the through holes of the rollers to make each roller freely rotatable. A roller bearing having a pin type cage is known in which both ends of a supporting pin are connected to first and second annular side plates that are coaxially opposed to each other to hold each roller at a constant interval between an inner ring and an outer ring. (Japanese Utility Model Publication No. 5-13381,
JP-A-11-51062).

For example, in one conventional example (conventional example 1) of this type of roller bearing, as a structure in which both ends of the pin are connected to an annular side plate, a male screw portion is formed at one end of the pin, and the male screw portion is formed into an annular shape. In addition to being fastened to the screw hole of the side plate, a fitting shaft part is formed at the other end of the pin, and the fitting shaft part is fitted in the fitting hole of the annular side plate with a gap and then fixed by full circumference welding. is doing.

In another conventional example (conventional example 2), the one end portion of the pin is connected with a screw as in the prior art example 1, and the other end portion is fixed by welding. A structure is adopted in which a tapered fitting shaft portion is formed at the other end, and the fitting shaft portion is fitted into a tapered fitting hole of the annular side plate and then fixed by welding all around. Also,
The fitting hole of the annular side plate is a straight hole, a bush having a tapered hole is driven between the straight hole and the tapered fitting shaft portion, and the end of the pin is welded to the annular side plate around the entire circumference. There is also a conventional example (conventional example 3) that adopts a structure for fixing by.

[0005]

By the way, in the conventional example 1 as described above, since the pin end portion on the welding side and the annular side plate are fitted in the gap and then fixed by welding, the existence of the gap causes the pin to be fixed to the pin. Since the repeated load applied mainly acts on the welded portion, there is a problem that the welded portion is likely to be damaged by long-term use.

Further, in the conventional examples 2 and 3 as described above, the end portion of the pin, the fitting hole of the annular side plate or the bush must be tapered, and the tapered surface on the pin side and the annular side plate or the bush side. If the fitting accuracy with the tapered surface does not match, a gap may be created between the fitting surfaces, and the same problem as in Conventional Example 1 may occur. There is a problem of having to manage it strictly. Further, when the bush is used, the cost is increased due to the increase in the number of parts.

Further, when assembling this type of roller bearing, it is necessary to accurately determine the distance between the annular side plates supporting both ends of the pin according to the length of the hollow roller. The roller bearing itself did not define the position between the annular side plates, so the alignment work was difficult.

Therefore, an object of the present invention is to solve the above problems, and a pin type cage is provided which is easy to process and does not increase the number of parts, and moreover, positions both annular side plates with respect to the pins. It is to provide a roller bearing.

[0009]

The above object of the present invention is to provide a pin type retainer having a plurality of pins whose both ends are coupled to first and second annular side plates that are coaxially opposed to each other.
A roller bearing comprising: a plurality of hollow rollers rotatably supported on the outer circumference of each pin and rotatably provided between an inner ring and an outer ring, wherein the first annular shape is provided at one end of each pin. A parallel male screw portion that is screwed into a screw hole formed in the side plate is formed, and a press-fitting shaft portion that is press-fitted into a fitting hole formed in the second annular side plate is formed on the other end side. The parallel male screw portion and the press-fitting shaft portion are provided at the base side with an abutting step portion that abuts against the inner side surfaces of the corresponding first and second annular side plates to define the connecting position. Achieved by roller bearings.

According to the above construction, the other end side of the pin (the side opposite to the side to which the screw is connected) is press-fitted (tightly fitted) into the fitting hole of the second annular side plate. There is no gap in. Therefore, the repeated load (especially radial load) applied to the pin can be surely received on the entire fitting surface.

Further, at the time of assembling the bearing, the abutting step portions formed on both end sides of the pin abut on the inner side surfaces of the first and second annular side plates to define the connecting position of the pin and each annular side plate. Therefore, the positioning between the first and second annular side plates with respect to the length of the hollow roller can be performed easily and accurately.

Further, since the pin is provided with the abutting step portion, the repetitive load (particularly the thrust load) applied to the pin can be received by the inner side surface of each annular side plate which is in contact with the abutting step portion. Therefore, it is not necessary to perform sufficient welding over the entire circumference so that the entire load can be received between the pin end portion and each annular side plate, and thus the annular shape caused by the temperature rise during welding is eliminated. The thermal deformation of the entire side plate can be suppressed to a minimum, and the reliability of the bearing can be improved.

Further, in assembling the pin type retainer, after one end side of each pin is screwed to the first annular side plate, the second annular side plate is hit with a hammer or the like to fit the second annular side plate. Since it can be performed by press-fitting the dowel hole into the press-fitting shaft portion on the other end side of each pin, the assembling work can be simplified. Further, since the end portion of the pin or the fitting hole of the second annular side plate is not tapered, it is easy to process, and there is no need to use a separate part such as a bush, so that the number of parts does not increase, It is possible to avoid unnecessary cost increase.

Preferably, both ends of the pin coupled to the corresponding first and second annular side plates are welded to the screw hole or the fitting hole to prevent rotation. In this case, since both ends of the pin are welded to the annular side plates to prevent the pin from rotating, the robustness of the cage can be further enhanced. It should be noted that this welding is a detent only, and unlike the conventional sufficient welding capable of receiving a full load, thermal deformation of the entire annular side plate caused by a temperature rise during welding is minimized.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION A roller bearing according to an embodiment of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a sectional view of an essential part of a roller bearing according to a first embodiment of the present invention. The roller bearing of the first embodiment includes an inner ring and an outer ring (not shown), a plurality of cylindrical hollow rollers 1 rotatably sandwiched between the inner ring and the outer ring, and the plurality of hollow rollers 1
And a pin type retainer 2 for holding at a predetermined interval.

As shown in FIG. 1, the pin type cage 2 has first and second annular side plates 3 and 4 which are coaxially opposed to each other, and both ends of which are connected to the annular side plates 3 and 4, respectively. The hollow rollers 1 are rotatably supported on the outer circumference of each pin 5 by passing each pin 5 through the through hole 1a of each hollow roller 1.

At both ends of the pin 5, a parallel male screw portion 6 provided on one end side is screwed into a screw hole 8 of the first annular side plate 3,
The press-fitting shaft portion 7 provided on the other end side is press-fitted (tight fit) into the fitting hole 9 of the second annular side plate 4 so as to be coupled to the first and second annular side plates 3 and 4. .

Further, the abutting step portions 10 and 11 provided on the base side of the parallel male screw portion 6 and the press-fitting shaft portion 7 are brought into contact with the inner surfaces of the corresponding first and second annular side plates 3 and 4. By doing so, the pin 5 and the first and second annular side plates 3, 4
The binding position with is defined. These butting step 1
Nos. 0 and 11 are formed by making the parallel male screw portion 6 and the press-fitting shaft portion 7 smaller in diameter than the body portion 5a at the center of the pin 5 in the axial direction.

Further, both ends of the pin 5 are screwed and press-fitted to the first and second annular side plates 3 and 4, respectively, and then, to the screw hole 8 or the fitting hole 9. It is welded in and stopped. Since the welding in this case is for the purpose of preventing the pin 5 from rotating, a simple full circumference welding may be used,
Spot welding may be used.

The welding on the side of the press-fitting shaft portion 7 (the welded portion is indicated by W1) is a V-shaped cross section formed by the chamfered portion 12 of the press-fitting shaft portion 7 and the chamfered portion 13 of the opening edge of the fitting hole 9. Is performed on the annular groove. Welding on the male screw portion 6 side (the welded portion is indicated by W2) is performed between the tip peripheral edge of the male screw portion 6 and the opening edge of the screw hole 8.

That is, according to the roller bearing of the first embodiment, the pin 5 for supporting the hollow roller 1 has the press-fitting shaft portion 7 side as the second side.
Since it is press-fitted into the fitting hole 9 of the annular side plate 4, there is no gap between the fitting surfaces (the outer peripheral surface of the press-fitting shaft portion 7 and the inner peripheral surface of the fitting hole 9). Therefore, the repeated load (in particular, the radial load) applied to the pin 5 can be entirely received by the fitting surface.

When assembling the bearing, the pin 5 is used.
The abutting step portions 10 and 11 formed on both end sides of the abutment contact the inner side surfaces of the first and second annular side plates 3 and 4, thereby defining the connecting position of the pin 5 and the annular side plates 3 and 4. . Therefore, the positioning of the first and second annular side plates 3 and 4 with respect to the length of the hollow roller 1 can be performed easily and accurately.

For example, the male screw portion 6 side of each pin 5 is screwed to the first annular side plate 3, the hollow roller 1 is fitted in each pin 5, and then the second annular side plate 4 is hit with a hammer or the like. , By press-fitting the fitting hole 9 of the second annular side plate 4 into the press-fitting shaft portion 7 of each pin 5, it is easy to assemble the first and second annular side plates 3 and 4 and the pin 5 at proper positions. Therefore, the assembling work can be simplified.

Moreover, since the pin 5 is provided with the abutting step portions 10 and 11, the repetitive load (in particular, the thrust load) applied to the pin 5 is brought into contact with the abutting step portions 10 and 11 of the pin 5. It can be reliably received by the inner side surfaces of the annular side plates 3 and 4.

Therefore, the ends of the pin 5 and the respective annular side plates 3, 4 are
Since it is not necessary to perform sufficient welding over the entire circumference so that the entire load can be received, it is possible to minimize the thermal deformation of the entire annular side plate caused by the temperature rise during welding. It can be suppressed and the reliability as a bearing can be improved.

Further, in the case of the roller bearing of the first embodiment,
Since the end portion of the pin 5 and the fitting hole 9 of the second annular side plate 4 are not tapered, the machining is easy, and no separate parts such as bushes are used, so that the number of parts does not increase. It is possible to avoid unnecessary cost increase.

FIG. 2 is a sectional view of the essential parts of a roller bearing according to the second embodiment of the present invention. The roller bearing of the second embodiment is
A plurality of cylindrical hollow rollers 21 rotatably sandwiched between an inner ring and an outer ring (not shown), and the plurality of hollow rollers 21.
And a pin type retainer 20 for holding at a predetermined interval.

As shown in FIG. 2, the pin type cage 20 has a collar portion 40 on the base side of the press-fitting shaft portion 27 of the pin 25.
By providing the abutting step portion 11 of the first embodiment.
The abutting step portion 41 having the same role as (see FIG. 1) is formed. Further, a counterbore portion 42 concentric with the fitting hole 29 is formed on the inner surface of the second annular side plate 24 so as to correspond to the collar portion 40.
Is provided so that the collar portion 40 can be accommodated.

Also on the male screw portion 26 side, a counterbore portion 43 is provided on the inner side surface of the first annular side plate 23 with which the butting step portion 30 on the base side of the male screw portion 26 abuts, and the bottom surface of the countersunk portion 43 is provided. The butting step portion 30 is adapted to abut. That is, in the roller bearing of the second embodiment, the counterbore portions 43, 42 are provided on the first and second annular side plates 23, 24.
Is provided, and the abutting step 3 of the pin 25 is provided on the inner bottom surface thereof.
Since 0 and 41 are brought into contact with each other, these counterbores 43 and 42
The positioning accuracy of the first and second annular side plates 23 and 24 and the pin 25 can be easily obtained by only obtaining the processing accuracy of the bottom surface of the. Other functions and effects are exactly the same as those of the roller bearing of the first embodiment.

The configurations of the first and second annular side plates, the pins, the hollow rollers, the abutting step portions, and the like in the roller bearing of the present invention are not limited to the configurations of the above respective embodiments, and the present invention is not limited thereto. It goes without saying that various forms can be adopted based on the spirit of the invention. For example, the roller bearing of the present invention is mainly applied to a single-row or multi-row cylindrical roller bearing, but can also be applied to a single-row or multi-row tapered roller bearing. However, in the case of applying to the tapered roller bearing, when the second annular side plate is press-fitted to the other end side of the pin, the pitch circle on the press-fitting end side of the pin is fixed to the second annular side plate by some jig. Press it by slightly deforming it so that it fits the pitch circle of the fitting hole. Then, after the press-fitting is completed, the pin may be fixed to the first and second annular side plates by spot welding or full-circle welding for the purpose of preventing rotation.

[0031]

As described above, according to the roller bearing of the present invention, since the other end side of the pin is press-fitted into the fitting hole of the second annular side plate, a gap is formed between the fitting surfaces. not exist. Therefore, the repeated load applied to the pin can be surely received on the entire fitting surface.

Further, at the time of assembling the bearing, the abutting stepped portions formed on both end sides of the pin contact the inner side surfaces of the first and second annular side plates to define the connecting position of the pin and each annular side plate. Therefore, the positioning between the first and second annular side plates with respect to the length of the hollow roller can be performed easily and accurately.

Further, by providing the pin with the butting step, the repeated load applied to the pin can be received by the inner side surface of each annular side plate which is in contact with the butting step. Therefore, since it is not necessary to perform sufficient welding over the entire circumference so that the entire load can be received between the pin end portion and each annular side plate, the annular shape caused by the temperature rise during welding is eliminated. The thermal deformation of the entire side plate can be suppressed to a minimum, and the reliability of the bearing can be improved.

Further, in assembling the pin type retainer, after one end side of each pin is screwed to the first annular side plate, the second annular side plate is hit with a hammer or the like to fit the second annular side plate. Since it can be performed by press-fitting the dowel hole into the press-fitting shaft portion on the other end side of each pin, the assembling work can be simplified. Further, since the end portion of the pin or the fitting hole of the second annular side plate is not tapered, it is easy to process, and there is no need to use a separate part such as a bush, so that the number of parts does not increase, It is possible to avoid unnecessary cost increase.

[Brief description of drawings]

FIG. 1 is a sectional view of essential parts of a roller bearing according to a first embodiment of the present invention.

FIG. 2 is a sectional view of an essential part of a roller bearing according to a second embodiment of the present invention.

[Explanation of symbols]

1 hollow roller 2-pin type cage 3 First annular side plate 4 Second annular side plate 5 pin 6 Parallel male thread 7 Press-fit shaft 8 screw holes 9 Fitting hole 10, 11 butting step W1, W2 weld

Claims (2)

[Claims] 1. A pin type retainer having a plurality of pins whose both ends are coupled to first and second annular side plates that are coaxially opposed to each other, and rotatably supported on the outer circumference of each of the pins. A roller bearing including a plurality of hollow rollers rotatably provided between an inner ring and an outer ring, wherein one end of each pin is screwed into a screw hole formed in the first annular side plate. A parallel male screw portion is formed, a press-fitting shaft portion that is press-fitted into a fitting hole formed in the second annular side plate is formed on the other end side, and a base portion side of the parallel male screw portion and the press-fitting shaft portion is formed. Is a roller bearing characterized in that it is provided with an abutting step portion that abuts on the inner surface of the corresponding first and second annular side plates to define a coupling position. 2. Both ends of the pin coupled to the corresponding first and second annular side plates are welded to the screw hole or the fitting hole to prevent rotation. The roller bearing according to claim 1.