JP2004360793A - Pin-type cage for rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pin-type cage capable of surely connecting an annular disc and a pin by simple procedure and stable in its quality free from distortion with high strength. <P>SOLUTION: An upper end part of the pin 2 is fitted to a cut formed on the first disc plate 5 by tight-fitting, a lower part of an inner diameter part 9 of the second annular plate 6 is brought into contact with an inner diameter-side side face of the upper end part of the pin 2 to keep the upper end part of the pin 2 in a state of being pressed into the cut, and the first annular plate 5 and the second annular plate are integrated by screwing. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to the structure of a pin type cage for a rolling bearing.
[0002]
[Prior art]
DESCRIPTION OF RELATED ART Conventionally, as a rolling bearing using a pin type | mold cage, there exists a thing described in the prior art document 1, for example.
That is, each hollow rolling element is held by a pin penetrating the hollow, and both ends of each pin are fixed to an annular plate, which is a pair of annular members opposed in the axial direction of the bearing.
[0003]
A plurality of pin receiving holes are respectively opened in the pair of annular plates constituting the retainer. The pin receiving hole formed in one of the annular plates is a screw hole, and one end of the pin is screwed and fixed to the screw hole.
The pin hole formed in the other annular plate is a welding hole into which the other end of the pin can be loosely inserted, that is, a welding hole (pin hole) having an appropriate clearance fit between the pin and the other end. ), The other end of the pin is inserted into the welding hole, and the end is fixed by welding.
[0004]
In the invention described in the prior art document 1, since the welded portion is only the outer end portion of the welding hole and there is a clearance fit between the other end of the pin and the pin hole, the welding hole is not provided. Is tapered so that the diameter increases toward the outer end, and a tapered bush is inserted between the welding hole and the other end of the pin, thereby eliminating the clearance between the pin side surface and the annular plate. By mechanically fitting, the structure is designed to reduce the concentration of stress generated in the cage during operation and increase the strength.
[0005]
[Patent Document 1]
Japanese Utility Model Publication No. 53-41642
[Problems to be solved by the invention]
As described above, in the conventional cage, since the end of the pin is fixed by welding, the deformation of the cage and the deformation of the cage due to the large heat generated during the welding process become large enough to take the penetration depth of the welded portion sufficiently. Changes in the material structure are unavoidable, and it is difficult to obtain dimensional accuracy and strength exceeding predetermined levels.
Also, depending on the operation pattern of the device incorporating the bearing, stress is repeatedly generated in the bearing retainer.However, the welded part has a complicated material structure due to heating and cooling during processing, penetration of the welding material, and residual stress. Also occur, and tend to be inferior in strength to fracture due to fatigue as compared with other parts.
[0007]
In addition, in the welded area, delicate changes in welding conditions may cause defects peculiar to welding, such as poor penetration of welding and blowholes.Processing conditions must be managed to obtain stable quality. is there. Ultrasonic inspection and X-ray inspection are generally used for inspection of internal defects, but special equipment and equipment are required, and inspection management is difficult.
In addition, when assembling the retainer, one pin is individually fastened and welded to each of the pair of annular plates, so that when a geometrical distortion occurs due to a processing error or an assembly procedure, the distortion is reduced. However, they tend to be partially concentrated without being dispersed.
The present invention has been made in view of the above-mentioned problems, and by mechanically joining, the fastening between the annular plate and the pin can be performed with stable strength, and a highly accurate pin with less distortion It is an object to provide a structure of a mold retainer.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a pin type retainer for a rolling bearing in which both ends of a pin are fixed to a pair of annular members, respectively.
At least one annular member of the pair of annular members is provided with a first annular plate formed with a notch for fitting a pin end side surface, and disposed opposite to the notch and from the opening side of the notch. A second annular plate having a pressing surface that abuts on the side surface of the pin end and presses the pin fitted into the notch, and fastens the first annular plate and the second annular plate. It is characterized by the following.
According to the present invention, at least one of the pin ends, the ends of all the pins are simultaneously fixed to the pair of annular plates by fitting.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
In the present embodiment, a pin type cage based on the present invention will be described by taking a rolling bearing composed of a tapered roller bearing as an example.
As shown in the partially enlarged cross-sectional view of FIG. 1, the tapered roller 1 is provided with a through hole 1a at the center in the axial direction, and the pin 2 passes through the through hole 1a. The central axes p of all the pins 2 are arranged on a conical surface that converges at one point. One end (lower end) of the pin 2 is fixed to the lower annular member 3, and the other end of the pin 2 is fixed to the upper annular member 4.
[0010]
The lower annular member 3 is formed of a single annular plate, and has a screw hole 3a opened coaxially with the axis of the pin 2 with respect to the pin mounting position. Then, the lower end of the pin 2 is fixed to the lower annular member 3 by screwing the male screw formed at the lower end of the pin 2 into the screw hole 3a.
The upper annular member 4 is composed of a first annular plate 5 (lower plate) and a second annular plate 6 (upper plate) that are stacked and arranged in the bearing axial direction. As shown in FIG. 2, 5, 5 are integrated by screwing. Reference numeral 7 indicates a screw.
[0011]
As shown in FIG. 3, the first annular plate 5 is a ring-shaped plate material, and has a semi-fitting surface that can be fitted to the upper end side surface (the outer diameter side surface) of the pin 2 by an interference fit. A first notch 10 having a cylindrical surface is formed. Each first notch 10 opens toward the radial center (inner diameter side) of the first annular plate 5. Reference numeral 11 denotes a screw hole.
Here, the first notch 10 corresponds to the notch described in the claims. The notch 10 is expressed as a semi-cylindrical surface assuming that the pin end is circular in cross section. However, if the pin end side is rectangular in cross section, the notch is also rectangular. The notch 10 has a shape that can be engaged with the side surface of the pin end.
[0012]
As can be seen from FIGS. 1 and 2, the second annular plate 6 is also a ring-shaped plate having an outer diameter equal to that of the first annular plate 5 but having an inner diameter equal to the first annular plate. Less than 5. The second annular plate 6 is opposed to the first annular plate 5 in the up-down direction (bearing axial direction), and has an outer diameter portion 8 which is in contact with the upper surface of the first annular plate 5 and an inner periphery of the outer diameter portion 8. The lower portion 9 </ b> A, which is continuous to the side, includes an inner diameter portion 9 which radially opposes the inner diameter surface of the first annular plate 5. The second annular plate 6 has a second notch 12 into which the upper end of the pin 2 can be inserted.
[0013]
As shown in FIG. 4, the lower side of the second notch 12 corresponding to the inner diameter portion 9 faces the first notch 10 with the upper end of the pin 2 interposed therebetween, and the upper end of the pin 2. The fitting portion 13A has a semicircular cross-section that can be fitted with a tight fit on the side surface. The lower portion 9A of the inner diameter portion 9, particularly the surface of the fitting portion 13A, which is the portion of the second notch 12, constitutes a pressing surface referred to in the claims.
[0014]
Here, the first notch 10 and the inner surface of the fitting portion 13 formed in the inner diameter portion 9 are engaged with the upper end side surface of the pin 2 having the central axis arranged along the conical surface. It has a shape. In the present embodiment, the fitting portion 13 of the first annular plate 5 and the second annular plate 6 is divided into two parts at a conical surface position where the center axes of the pins 2 are arranged. ing. However, the position is not limited to the conical surface position.
[0015]
Then, after fitting the outer diameter side surface of the upper end portion of each pin 2 into the first notch 10 of the first annular plate 5, the second annular plate 6 is lowered from above as shown in FIG. Then, the upper ends of the corresponding pins 2 are arranged in the respective second notches 12 of the second annular plate 6, and the fitting portions 13 are brought into contact with the inner diameter side surfaces of the pins. Further, the second annular plate 6 is lowered downward until the outer diameter portion 8 contacts the upper surface of the first annular plate 5. At this time, the fitting portion 13 is relatively guided by the inner diameter side surface of the pin and moves downward.
[0016]
Thereby, the portion of the second notch 12 of the inner diameter portion 9, that is, the fitting portion 13 is opposed to the notch 10 with the pin 2 interposed therebetween. Is pushed into the first notch 10 to be held down.
In this state, the first annular body and the second annular body are integrated by screwing the first annular body and the second annular plate 6 together.
Next, the operation and effect of the present embodiment will be described.
According to the present embodiment, since the welded portion used in the conventional cage is positioned and fastened by fitting by interference fit, it is possible to obtain stable quality in terms of shape accuracy and strength.
[0017]
Further, in the present embodiment, one end (lower end) of the pin 2 is screwed to the lower annular member 3 as before, but the other end (upper end) is formed of two annular plates 5 and 5. 6 and is fixed by fitting with a screw hole 11 provided in 6. For this reason, even if there is a variation in the screwing position of the screw portion at the lower end of each pin 2, the fixing position of the pin 2 in the axial direction has a degree of freedom in mounting to the upper annular member 4. That is, since the mounting position of the upper end of the pin 2 can be moved slightly in the axial direction, the axial clearance between the rolling element and the retainer (upper and lower annular members) can be accurately adjusted without causing distortion. It can be set to the desired value. That is, since the upper ends of all the pins 2 are simultaneously positioned and fastened by the two annular plates 5 and 6, distortion can be dispersed, and a cage having high strength and stable dimensions can be obtained. Distortion is unlikely to occur when the product is completed.
[0018]
Furthermore, quality control is possible by controlling the dimensions of the parts and controlling the fastening of the two annular plates 5 and 6.
Here, in the above-described embodiment, the case where the pin end fixing method according to the present invention is adopted to only one end is described, but both ends of the pin 2 are connected to the two annular plates. It may be adopted and fixed to an annular member composed of 5 and 6.
Further, in order to prevent the pin 2 from coming off and to strengthen the joint, the upper annular member 4 composed of the two annular plates 5 and 6 and the fitted pin 2 are connected to each other by spot-tig welding with a relatively small heat input. May be used to reinforce the fixation.
Here, the processing of the first notch 10 and the second notch 12 portion (fitting portion 13) of the inner diameter portion 9 to be a pin fitting portion in the two annular plates 5 and 6 is performed by two sheets. Since the annular plates 5 and 6 can be easily formed by drilling coaxially with the axis of the pin 2 in a state where the annular plates 5 and 6 are screwed, a special processing step is not required.
[0019]
Further, in the above embodiment, since the tapered roller bearing is assumed, the first notch 10 formed in the first annular plate 5 is opened on the inner diameter side, and the second notch 10 formed in the second annular plate 6 is formed. The case where the notch 12 opens to the outer diameter side is illustrated. In the case of another rolling bearing, a first notch 10 formed in the first annular plate 5 opens on the outer diameter side, and a second notch 12 formed on the second annular plate 6 opens on the inner diameter side. May be set. The point is that the first notch 10 and the second notch 12 only need to be arranged so as to face each other with the pin 2 interposed therebetween. However, it is preferable that the bearings face each other in the radial direction of the bearing. Further, the second notch may be a hole other than the notch except the portion of the fitting portion 13. In short, it is only necessary that the pin be movable in the axial direction.
[0020]
Further, in the above-described embodiment, the fitting portion 13 formed in the lower portion 9A of the inner diameter portion 9 of the second notch 12 is fitted to the upper end side surface of the pin 2, but is not limited thereto. For example, as shown in FIG. 6, a portion 9 </ b> A radially opposed to the first notch 10 in the inner diameter portion 9 abuts on the inner diameter side surface of the upper end of the pin 2 from the inner side in the radial direction, and the pin 2 is cut into the first notch. It is sufficient that the pin 2 is pushed into the notch 10 to prevent the upper end of the pin 2 from coming off from the first notch 10. However, as described above, it is possible to fix more firmly in the tight fit state.
[0021]
Further, in the above-described embodiment, the tapered roller bearing is illustrated, but other rolling bearings such as a spherical roller bearing (self-aligning roller bearing) can be applied.
As described above, in the pin-type cage according to the present embodiment, one end of all the pins 2 can be evenly tightened and fixed by the pair of annular plates 5 and 6, so that the distortion is dispersed. In addition, it is possible to provide a pin-type cage having a stable shape and quality.
Further, the pin type cage can be manufactured even if the component parts are difficult to weld materials (high carbon steel, copper alloy, ceramics, aluminum alloy, etc.) or a combination of different materials.
[0022]
【The invention's effect】
As described above, according to the present invention, it is possible to accurately fix a pin to an annular member, to provide a pin-shaped retainer with small distortion, stable shape and high quality in terms of strength. I can do it.
[Brief description of the drawings]
FIG. 1 is a partially enlarged view illustrating attachment of a pin and a retainer according to an embodiment of the present invention.
FIG. 2 is a perspective view showing an assembly of two annular plates according to the embodiment according to the present invention.
FIG. 3 is a plan view showing a first annular plate according to the embodiment according to the present invention.
FIG. 4 is a sectional view taken along line XX in FIG.
FIG. 5 is a diagram illustrating an assembly according to the embodiment based on the present invention.
FIG. 6 is a diagram illustrating another example of the fitting portion according to the embodiment based on the present invention.
[Explanation of symbols]
1 roller 2 pin 3, 4 annular member 5 first annular plate (inside)
6 Second annular plate (outside)
7 Screw 8 Outer diameter part 9 Inner diameter part 10 First notch (notch)
11 screw hole 12 second notch 13 fitting part

Claims (1)

In a pin type retainer for a rolling bearing in which both ends of a pin are respectively fixed to a pair of annular members,
At least one annular member of the pair of annular members has a first annular plate formed with a notch for fitting a pin end side surface, and is disposed to face the notch and from the opening side of the notch. A second annular plate having a pressing surface that abuts on the side surface of the pin end and presses the pin fitted into the notch, and fastens the first annular plate and the second annular plate. A pin type retainer for a rolling bearing, characterized in that:

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