JP2000227122A - Flange type bearing unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove extremely easily from a machine without impairing an external appearance thereof caused by a flaw received at removal. SOLUTION: This flange type bearing unit 1 is provided with a rolling bearing 10 and a bearing box 20 comprising an annular bearing holding part 21 which holds the rolling bearing 10 inside and a flange part 22 which extends from the bearing holding part 21 toward outside, and is mounted with a mounting face on a back side of the flange part 22 being contacted to a flame 52 of a machine by a mounting bolt 51 inserted in a mounting bolt-hole 27 formed in the flange part 22. Multiple tapped holes 28 which penetrates the flange part 22 in the axial direction is arranged at approximately even intervals in the circumferential direction with avoiding a position to have the mounting bolt-hole 27 formed, and a bolt 57 is screwed into each tapped hole 28 from the right side of the flange part 22 to press the flame 52 at a tip of each bolt 57.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flange type bearing unit which can be easily removed from a machine.

[0002]

2. Description of the Related Art Generally, a bearing unit including a rolling bearing and a bearing housing for holding the rolling bearing is generally known as a bearing unit.
A type called a "pillow type" and a type called a "flange type" are used properly depending on the application.
Among the above, the flange type bearing unit is, for example, as shown in FIG.
It is as shown in FIG. That is, the flange type bearing unit 41 is composed of the rolling bearing 42 and the bearing box 43. The rolling bearing 42 includes an outer ring 44 and an inner ring 4.
5, and rolling elements (not shown) such as balls interposed between the outer ring 44 and the inner ring 45. On the other hand, the bearing box 43 includes an annular bearing holding portion 46 for holding the rolling bearing 42, and a flange portion 47 projecting outward from the bearing holding portion 46, and the flange portion 47 has four mounting bolt holes. (Not shown) are formed.

In this flange type bearing unit 41, a bearing box 43 is fixed to a frame 52 of a machine with mounting bolts 51 inserted into the mounting bolt holes, and an inner ring 45 and a shaft 53 inserted therethrough are two. It is used in a state where it is fixed with a set screw 54.

Incidentally, when the flange type bearing unit 41 is replaced with a new one due to wear of the rolling bearing 42,
When the shaft 53 is to be removed for maintenance inside the machine, the flanged bearing unit 41 in the attached state must be removed from the machine. However, the removal operation is not easy.

That is, when the flange type bearing unit 41 has been used for a long period of time, the flange portion 47 of the bearing box 43 and the frame 52 of the machine may be rusted or the adhesiveness of the paint applied to the machine may be reduced. In many cases, they are firmly fixed. Also, between the inner ring 45 of the rolling bearing 42 and the shaft 53, in addition to the originally small gap, the rusting and the flaw of the set screw 54 on the peripheral surface of the shaft 53 are made. For this reason, it often fits in a state where it cannot be easily removed. Therefore, the flange-type bearing unit 41 does not come off just by pulling it by hand.

Therefore, conventionally, a flange type bearing unit 41
In order to remove the screw, loosen the set screw 54 and remove the mounting bolt 51, and then insert a tool 55 having a flat tip such as a flathead screwdriver or a spatula between the frame 52 and the flange 47 as shown in FIG. The bearing box 43 is lifted from the frame 52 by hitting the tip of the tool 55 between the two by hitting with a hammer in the direction of the arrow in the figure. In that case, the bearing housing 43
The tool 55 is alternately applied from both sides in the diametric direction of the bearing box 43 so as to float up little by little in order to prevent the bearing 55 from being inclined with respect to the frame 52.

[0007]

However, in the above-mentioned prior art, another part or the like disposed around the flange type bearing unit 41 hinders the driving of the tool 55 from a desired direction. In some cases, the removal work is extremely difficult, and it takes an average of 30 to 40 minutes to remove one flange-type bearing unit 41, so labor costs related to maintenance are reduced. It was also expensive. In addition, there is also a problem that the appearance of the machine is impaired because the frame 52 is scratched when the tip of the tool 55 is beaten.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is very easy to remove the machine from the machine. It is an object of the present invention to provide a flange-type bearing unit without any problem.

[0009]

In order to achieve the above object, the present invention provides a rolling bearing having a rolling element interposed between an outer ring and an inner ring, and supporting the outer ring of the rolling bearing on an inner peripheral surface. An annular bearing holding portion having a bearing seat formed therein and a bearing box having a flange portion projecting outward from the bearing holding portion, and a mounting bolt inserted through a mounting bolt hole formed in the flange portion. A flange-type bearing unit which is mounted in a state where the mounting surface on the back side of the flange portion is in contact with the frame of the machine, wherein the flange portion has a plurality of screw holes axially penetrating the flange portion; Are arranged at substantially equal intervals in the circumferential direction, avoiding the formation positions of the bolts. Bolts can be screwed into the respective screw holes from the front side of the flange portion, and the end of each bolt can press the frame of the machine. Are those configured urchin.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A flange type bearing unit according to an embodiment of the present invention will be described below with reference to FIGS. The flange type bearing unit indicated by reference numeral 1 in the whole is composed of a rolling bearing 10 and a bearing box 20.

The rolling bearing 10 includes a number of balls 13 (rolling elements) held at predetermined intervals by a retainer 14 between an outer ring 11 and an inner ring 12.
Is formed on a centering seat 15 having a convex spherical surface. Two setscrews 54 are screwed into the inner ring 12.

On the other hand, the bearing housing 20 has an annular bearing holding portion 2.
1 and a flange portion 22 that protrudes outward (that is, radially outward) from the bearing holding portion 21.
A concave spherical bearing seat 23 is formed on the inner peripheral surface of the bearing holding portion 21, and the outer ring 11 of the rolling bearing 10 is held by the bearing holding portion 21 by the engagement of the bearing seat 23 and the alignment seat 15. Have been.

The rear side of the flange portion 22 is the frame 5 of the machine.
2 and the mounting surface 2
At the center of 4, a cylindrical stamping part 25 integrated with the bearing holding part 21 and the flange part 22 is protruded. The flange portion 22 has four protrusions 26 whose upper surface is continuous with the upper surface of the bearing holding portion 21 at equal intervals in the circumferential direction. Each of the protrusions 26 has a mounting bolt hole 27 (a so-called “fool hole”). )).

Further, two screw holes 28 are formed in the flange portion 22 so as to penetrate the flange portion 22 in the axial direction of a shaft 53 described later. On the inner peripheral surface of each screw hole 28, a female screw to be screwed with a bolt having an appropriate diameter (for example, about M8 to M12) is cut. Such a screw hole 28
The mounting bolt holes 27 are provided at substantially equal intervals in the circumferential direction (in this embodiment, at positions shifted from each other in the circumferential direction by about 180 °), avoiding the formation positions of the mounting bolt holes 27.

When the flange type bearing unit 1 is mounted, the stamping portion 25 is fitted into a stamping portion fitting hole 56 formed in the machine frame 52, and the mounting bolts 51 inserted into the respective mounting bolt holes 27. The mounting surface 24
The bearing box 43 is fixed to the frame 52 in a state in which the shaft is in contact with the surface of the frame 52, the shaft 53 is inserted through the inner ring 12, and the shaft 53 and the inner ring 12 are fixed with two setscrews 54.

On the other hand, when removing the mounted flange type bearing unit 1 from the machine, the set screw 54 is loosened, the mounting bolt 51 is removed, and each screw hole 28 is removed.
Then, a bolt 57 having an appropriate length and a diameter to be screwed into these screw holes 28 is screwed in from the front side of the flange portion 22. After the tips of the bolts 57 come into contact with the surface of the frame 52, the bolts 57 are further screwed using a tool (not shown) such as a spanner or a wrench, and the tips of the bolts 57 press the frame 52. As a result, the bearing box 20 is moved in the axial direction away from the frame 52 by the reaction force (see FIG. 3). At this time, by alternately screwing the two bolts 57 at an appropriate rotation angle, the bearing housing 20 can be moved while the mounting surface 24 is kept substantially parallel to the surface of the frame 52. As described above, since the bearing box 20 can be prevented from being inclined, there is no problem that the stamping part 25 is caught in the hole 56 and does not come out smoothly.

As shown in FIG. 3, when the bearing housing 20 is lifted to some extent from the surface of the frame 52, the fixed state between the inner ring 12 of the rolling bearing 10 and the shaft 53 is also loosened. The flange type bearing unit 1 can be pulled out of the shaft 53 by pulling, but the inner ring 12
If the shaft 53 and the shaft 53 are firmly fitted and cannot be pulled out by hand, a so-called “pull puller” (gear puller) can be used.

As described above, in this embodiment, the flange type bearing unit 1 is moved in the axial direction by the reaction force generated by the tip of the bolt 57 screwed into the screw hole 28 pressing the frame 52. It is raised from the frame 52. Therefore, even when the space between the mounting surface 24 of the bearing housing 20 and the frame 52 and the space between the inner ring 12 of the rolling bearing 10 and the shaft 53 are firmly fixed due to rust or the like, the flange-type bearing unit is reliably provided. 1 can be moved and removed.

In the prior art, if another part or the like is provided around the flange-type bearing unit, it becomes a hindrance, and it becomes more difficult to remove the bearing unit. On the other hand, in this embodiment, if there is no obstacle even in front of the flange type bearing unit 1, even if another component or the like is arranged around, the bolt 57 is turned using a long T wrench or the like. The flange-type bearing unit 1 can be removed very easily. Further, by using the bolt 57 that is sufficiently long, it is possible to turn the bolt 57 without disturbing surrounding parts. By performing the above, the operation of removing one flange-type bearing unit, which conventionally took 30 to 40 minutes, can be performed in a short time of about 5 minutes in the present invention. Savings.

Furthermore, the frame 52 may be scratched by the contact of the tip of the bolt 57,
The scratches are extremely small as compared with the scratches caused by hammering the tool in the prior art, and when the flange type bearing unit 1 is mounted again, the scratches become deep inside the screw holes 28 and are almost invisible from the outside. Thus, the scratch does not impair the appearance of the machine.

It is needless to say that the present invention is not limited to the above embodiment. For example, in the above description, two screw holes 28 are formed in the flange portion 22, but three or more screw holes 28 are formed substantially in the circumferential direction. It is also conceivable to arrange them at intervals.
In the above description, the one having the sealing part 25 is shown.
The present invention is also applicable to a flange type bearing unit in which a bearing box is not provided with a sealing part. Further, in the above description, the ball 13 is used as a rolling element, but the present invention is also applicable to a flange type bearing unit provided with a rolling bearing using a roller as a rolling element. Furthermore, in the above, the bearing housing 1
Although the so-called "round flange-shaped" bearing unit in which the flange portion 22 is circular is shown, a so-called "square flange-shaped" bearing unit in which the flange portion is substantially square, or a substantially triangular shape on both sides in the diameter direction of the bearing holding portion. The so-called “diamond flange type” bearing unit (with two mounting bolt holes) and the flange type bearing unit provided with bearing boxes of various shapes other than those described above are also applicable to the present invention. The invention is applicable.

[0022]

As described above, according to the present invention,
The tip of the bolt screwed into the screw hole in the flange moves the flange-type bearing unit in the axial direction due to the reaction force generated by pressing the machine frame, lifts it off the frame, and removes it. Even if another part is provided, the device can be reliably and easily removed, and the appearance of the machine is not impaired by the flaws that occur during removal as in the related art.

[Brief description of the drawings]

FIG. 1 is a front view showing a mounting state of a flange type bearing unit according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line AA of FIG.

FIG. 3 is an enlarged cross-sectional view of a cut surface corresponding to FIG. 2 for explaining a state in which a flange type bearing unit is removed.

FIG. 4 is an explanatory diagram for explaining how to attach and remove a conventional flange type bearing unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flange type bearing unit 10 Rolling bearing 11 Outer ring 12 Inner ring 13 Ball (rolling element) 20 Bearing box 21 Bearing holding part 22 Flange part 23 Bearing seat 24 Mounting surface 27 Mounting bolt hole 28 Screw hole 51 Mounting bolt 52 Frame 57 Bolt

Claims (1)

[Claims] 1. A rolling bearing having a rolling element interposed between an outer ring and an inner ring, an annular bearing holding portion having an inner peripheral surface formed with a bearing seat for supporting the outer ring of the rolling bearing, and the bearing. A bearing box having a flange portion projecting outward from the holding portion, wherein the mounting surface on the back side of the flange portion is brought into contact with a machine frame by a mounting bolt inserted into a mounting bolt hole formed in the flange portion. In the flange-type bearing unit mounted in a state, a plurality of screw holes which penetrate the flange portion in the axial direction are arranged at substantially equal intervals in the circumferential direction, avoiding a position where the mounting bolt hole is formed. A flange-type shaft, wherein a bolt is screwed into each of the screw holes from the front side of the flange portion so that a frame of the machine can be pressed by a tip end of each bolt. Unit.