JP4310089B2 - Roller bearing - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a roller bearing.
[0002]
[Prior art]
As a conventional example, there is a needle roller bearing as shown in FIG. 8 (see, for example, Patent Document 1). In the figure, 81 is the entire needle roller bearing, 82 is a shell-shaped outer ring, 83 is a plurality of needle rollers, and 84 is a cage ring.
[0003]
The outer ring 82 is manufactured by pressing a single metal plate, and bent pieces 82b and 82c are provided on both axial sides of the cylindrical portion 82a. The bent pieces 82b and 82c are bent by 180 degrees with respect to the cylindrical portion 82a, so that the upper half of the cross section is a U-shaped sideways.
[0004]
The tip surfaces of the two bent pieces 82b and 82c serve as guide surfaces for the needle rollers 83, and the inner peripheral surfaces of the two bent pieces 82b and 82c serve as guide surfaces for the cage ring 84.
[0005]
[Patent Document 1]
JP-A-6-264930 (FIGS. 15 and 16)
[0006]
[Problems to be solved by the invention]
The needle roller bearing 81 is excellent in that the strength of the bent pieces 82b and 82c is high and the guide of the needle roller 83 and the cage ring 84 by the bent pieces 82b and 82c is good.
[0007]
However, since the bent pieces 82b and 82c are bent 180 degrees with respect to the cylindrical portion 82a, the length of the needle roller 83 is defined for the axial length of the bent pieces 82b and 82c. If the total length of the needle roller bearing 81 is restricted, the length of the needle roller 83 will be shortened. Moreover, in order to facilitate processing when the bent pieces 82b and 82c are bent 180 degrees with respect to the cylindrical portion 82a, the thickness of the outer ring 4 as a whole is made as thin as possible. For example, under conditions where an excessive impact load is applied to the outer ring 82, the outer ring 82 may be damaged. For this, it is only necessary to make the outer ring 82 as thick as possible. However, if the outer ring 82 is made too thick, the bent pieces 82b and 82c on both sides in the axial direction of the outer ring 82 are bent 180 degrees with respect to the cylindrical portion 82a. It becomes extremely difficult to achieve this state.
[0008]
[Means for Solving the Problems]
The present invention is a roller bearing disposed in an annular space formed between an outer cylinder and a shaft inserted through the outer cylinder, and is fitted and fixed to the inner peripheral surface of the outer cylinder and presses a metal plate A shell-shaped outer ring, a plurality of rollers disposed on the inner periphery of the outer ring and having the outer peripheral surface of the shaft body as an inner ring raceway, and housed in the inner periphery of the outer ring at several locations around the circumference. A retainer ring for holding the roller, and is bent at least at one side in the axial direction of the outer ring so as to fall into the inner side of the outer ring rather than a surface along the radial direction and linearly toward the tip thereof A radially oblique inwardly bent piece extending to the roller, and an end surface of the roller has a shape substantially parallel to a surface perpendicular to the rotation axis of the roller, One end in the axial direction is smaller than the diameter of the circle connecting the centers of the rollers. Further, it is disposed on the inner diameter side of the bent piece of the outer ring with a predetermined gap, and within the thickness range on the distal end side of the bent piece, the surface with respect to the end face of the roller in accordance with the axial displacement of the rotating roller The roller guide surface that can be contacted by the roller and the cage guide surface that can contact the outer peripheral surface of the cage ring are chamfered, respectively, and the radial width of the roller guide surface and the cage The width of the guide surface in the axial direction is formed to be smaller than the thickness of the bent piece .
[0009]
In addition, the said outer cylinder is a cylindrical member arrange | positioned at the outer diameter side of a roller bearing. The shaft body is a member arranged on the inner diameter side of the roller bearing, and may be a hollow member or a solid member.
[0010]
In this case, since the bent piece provided on at least one axial side of the outer ring is not bent at a large angle (180 degrees) as in the conventional example, it is advantageous in reducing the axial dimension compared to the conventional example. Become. Moreover, even when the thickness of the outer ring is increased in order to increase the strength of the outer ring, it becomes easy to process with high accuracy. In addition, even when the roller interferes with the bent piece, the roller end surface does not contact the edge with respect to the roller guide surface provided on the distal end side of the bent piece, which adversely affects the rotational tone of the roller. It is not necessary to give.
[0012]
Further, since the peripheral speed of the cage ring can be reduced, wear and heat generation between the cage ring and the bent piece of the outer ring are suppressed when the cage ring interferes with the cage guide surface of the bent piece of the outer ring. It becomes possible.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
1 to 4 show Embodiment 1 of the present invention. In the first embodiment, a needle roller bearing is exemplified as a roller bearing. As shown in the drawing, a shaft body 2 is inserted concentrically on the inner periphery of the outer cylinder 1, and a needle roller bearing 3 is interposed in an annular space between the outer cylinder 1 and the shaft body 2.
[0014]
Specifically, the needle roller bearing 3 includes a shell-shaped outer ring 4, a plurality of needle rollers 5, and a cage ring 6.
[0015]
The shell-shaped outer ring 4 is fitted and fixed to the inner peripheral surface of the outer cylinder 1 by, for example, press-fitting, and bent pieces 4b and 4c are provided on both axial sides of the cylindrical portion 4a. The shell-shaped outer ring 4 is manufactured by bending a single metal plate (such as a thin steel plate) by pressing.
[0016]
Both ends of the needle roller 5 have a shape substantially parallel to a surface orthogonal to the rotation axis, and the corners of the outer peripheral surface and the end surface are rounded and chamfered. In addition, although the end surface of the needle roller 5 is substantially parallel, it may have a slightly wavy shape. In the needle roller 5, the amount of displacement in the axial direction is restricted by the two bent pieces 4b and 4c of the outer ring 4. A predetermined gap is provided between the end face of the needle roller 5 and the two bent pieces 4b and 4c.
[0017]
The cage ring 6 has a shape in which pockets 6a penetrating inward and outward in the radial direction are provided at several circumferential positions of a cylindrical member, and is disposed on the inner diameter side of the bent pieces 4b and 4c of the outer ring 4. Specifically, as shown in FIG. 2, the outer diameter of the cage ring 6 is set smaller than the diameter (PCD) of the circle connecting the centers of the needle rollers 5, and the circumferential width W of the pocket 6a is set to be smaller. By setting the diameter smaller than the diameter R of the needle roller 5, the needle roller 5 is prevented from coming out from the pocket 6a of the cage ring 6 toward the inner diameter side. The cage ring 6 is manufactured by bending a single metal plate (such as a thin steel plate) by press working.
[0018]
By the way, in the shell-shaped outer ring 4, the first bent piece 4b is set to the same thickness as the cylindrical portion 4a, but the second bent piece 4c and the cylindrical portion 4a are closer to the second bent piece 4c. The region is set to be thinner than the thickness of the raceway surface region of the cylindrical portion 4a. The reason why the second bent piece 4c is thus thin is that the second bent piece 4c is bent after the outer ring 4 is drawn into a bottomed cylindrical shape by pressing, This is to facilitate the subsequent bending work.
[0019]
In this embodiment, the bent shape of the bent pieces 4b and 4c provided on both sides in the axial direction is devised.
[0020]
That is, as shown in FIG. 3, the bent pieces 4 b and 4 c are bent in such a manner as to fall inward of the outer ring 4 with respect to the surface X along the radial direction, thereby being in a radially oblique inward posture. The bending angle θ1 of the bending pieces 4b and 4c with respect to the cylindrical portion 4a can be set to more than 90 degrees and less than 180 degrees, and preferably 135 degrees. When the bending angle θ1 is set to 135 degrees, the angle θ2 sandwiched between the surface X along the radial direction and the center line Y of the bending pieces 4b and 4c is 45 degrees.
[0021]
The front end surfaces 7 b and 7 c of the bent pieces 4 b and 4 c in the outer ring 4 are both set substantially parallel to the diameter (PCD) of the circle connecting the centers of the needle rollers 5 and the outer peripheral surface of the cage ring 6. Has been. The front end surfaces 7b and 7c of the bent pieces 4b and 4c are guides that guide the cage ring 6 by contacting the outer circumferential surface of the cage ring 6 with the surface when the cage ring 6 is displaced in the radial direction. It becomes a surface.
[0022]
Tapered chamfers 8b and 8c that are substantially parallel to the surface X along the radial direction are formed at the inner corners at the ends of the bent pieces 4b and 4c of the outer ring 4. The chamfers 8b and 8c serve as guide surfaces for guiding the needle rollers 5 by making contact with the substantially flat end surfaces of the needle rollers 5 when the needle rollers 5 are displaced in the axial direction. The chamfers 8b and 8c of the bent pieces 4b and 4c are substantially orthogonal to the distal end surfaces 7b and 7c of the bent pieces 4b and 4c.
[0023]
The first bent piece 4b is bent in the process of squeezing the outer ring 4 from a single metal plate by pressing. Further, in the second bent piece 4c and the cylindrical portion 4a described above, the thin region near the second bent piece 4b is crushed by pressing before the outer ring 4 is squeezed from one metal plate by pressing. It can be formed, or can be formed by cutting in the aforementioned stage. Moreover, the front end surfaces 7b and 7c and the chamfers 8b and 8c of the first and second bent pieces 4b and 4c can be formed by being crushed by pressing or the like, or by being cut by cutting or the like.
[0024]
In the first embodiment described above, since the bent pieces 4b and 4c of the outer ring 4 are not bent back as in the conventional example, the axial dimension can be made smaller than in the conventional example. Moreover, even when the thickness of the outer ring 4 is increased in order to increase the strength of the outer ring 4, it can be processed with high accuracy. Incidentally, in the outer ring 4 shown in the first embodiment, the thickness of the cylindrical portion 4a and the first bent piece 4b is 50% thicker than that of the conventional example shown in FIG. However, when the thickness of the outer ring 4 is not increased, the needle roller bearing 3 is superior to the conventional example in that the needle roller bearing 3 can be made compact in the axial direction as described above.
[0025]
Further, guide chamfers 8b and 8c for the needle rollers 5 and guide surfaces 7b and 7c for the cage ring 6 are provided on the distal end side of the bent pieces 4b and 4c of the outer ring 4, so that FIG. As shown, when the needle rollers 5 are displaced in the axial direction and interfere with the bent pieces 4b and 4c, or when the cage ring 6 is displaced in the radial direction and interfered with the bent pieces 4b and 4c, Thus, the end surfaces of the needle rollers 5 and the outer peripheral surface of the cage ring 6 can be brought into contact with each other without causing contact with the edges. For this reason, it is not necessary to adversely affect the rotational tone of the needle roller 5 and the cage ring 6, thereby contributing to stabilization of the rolling characteristics of the needle roller bearing 3.
[0026]
As described above, the needle roller bearing 3 of the above embodiment can achieve the downsizing in the axial direction and the strength of the outer ring 4 while inheriting the excellent points of the conventional needle roller bearing. .
[0027]
In addition, this invention is not limited only to embodiment mentioned above, Various application and deformation | transformation can be considered.
[0028]
(1) FIG. 5 shows a second embodiment of the present invention. In the second embodiment, the tip surface 7c of the second bent piece 4c of the outer ring 4 shown in the first embodiment is orthogonal to the center line Y of the second bent piece 4c, and the second bent Tapered chamfers 9c1 and 9c2 are formed at the inner corner and the outer corner at the tip of the piece 4c. The posture and shape of the first bent piece 4b are the same as those in the first embodiment. Specifically, the chamfer 9c1 at the inner corner is substantially parallel to the end face of the needle roller 5, and the chamfer 9c2 at the outer corner is substantially parallel to the outer peripheral surface of the cage ring 6. Is set. For example, when the angle θ2 sandwiched between the surface X along the radial direction and the center line Y of the second bent piece 4c is 45 degrees, a circle connecting the tip surface 7c of the second bent piece 4c and the center of each of the needle rollers 5 The angle θ3 sandwiched between the diameters (PCDs) is set to 45 degrees, and the angle θ4 sandwiched between the chamfers 9c1 and 9c2 and the tip surface 7c is set to 45 degrees. Thereby, when the needle roller 5 or the cage ring 6 interferes with the second bent piece 4c, the needle roller 5 or the cage ring 6 comes into contact with the surface without hitting the edge. This will not adversely affect the rotation of the machine. In addition, about the attitude | position and shape of the 1st bending piece 4b, you may make it the same structure as the 2nd bending piece 4c demonstrated by this item.
[0029]
(2) FIG. 6 shows a reference example of the present invention. In this reference example , a round chamfer 10 is formed on the entire tip of the second bent piece 4c of the outer ring 4 shown in the first embodiment. The posture and shape of the first bent piece 4b are the same as those in the first embodiment. In this case, when the needle roller 5 or the cage ring 6 interferes with the tip of the second bent piece 4c, the needle roller 5 or the retainer ring 6 comes into contact with a line or surface without hitting the edge. There is no need to adversely affect the rotational tone of the cage ring 6. In addition, about the attitude | position and shape of the 1st bending piece 4b, you may make it the same structure as the 2nd bending piece 4c demonstrated by this item.
[0030]
(3) FIG. 7 shows Embodiment 3 of the present invention. In the third embodiment, the first bent piece 4b of the outer ring 4 shown in the first embodiment is set to a posture along the radial direction, that is, approximately 90 degrees with respect to the cylindrical portion 4a. The posture and shape of the second bent piece 4c are the same as those in the first embodiment. Specifically, the front end surface 7b of the first bent piece 4b is set substantially parallel to the diameter (PCD) of the circle connecting the centers of the needle rollers 5. In addition, about the attitude | position and shape of the 2nd bending piece 4c, you may make it the same structure as the said Embodiment 2. FIG.
[0031]
(4) The cage ring 6 shown in the first to third embodiments may be manufactured by injection molding a synthetic resin. In this case, it can be manufactured easily and at a lower cost than the case of manufacturing by press working. In addition, when the cage ring 6 is made of a synthetic resin, when the cage ring 6 is in sliding contact with the bent pieces 4b and 4c of the outer ring 4, no sliding contact between the metals occurs. This is advantageous in that it is less likely to be damaged. The synthetic resin used as the material for the cage ring 6 is a synthetic resin having high strength and high heat resistance, such as PES (polyethersulfone), PPS (polyphenylene sulfide), PEEK (polyetheretherketone), nylon. 46, nylon 66, and the like.
[0032]
(5) In the first to third embodiments, the needle roller bearing 3 has been described as an example, but a roller bearing can be used.
[0033]
【The invention's effect】
In the present invention, since the bent piece provided on at least one axial direction side of the shell-shaped outer ring is not folded back as in the conventional example and is inclined, the axial dimension can be reduced as compared with the conventional example. In addition, even if the thickness of the outer ring is increased to increase the strength of the outer ring, it can be processed with high accuracy. Further, even when the roller interferes with the bent piece, the roller end face does not contact the edge with respect to the guide surface provided on the distal end side of the bent piece, which adversely affects the rotational tone of the roller. You don't have to give it.
[Brief description of the drawings]
1 is a cross-sectional view showing an upper half of a needle roller bearing according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view taken along line (2)-(2) of FIG. FIG. 4 is an enlarged view of the second bent piece. FIG. 4 is a view showing a state in which the needle rollers and the cage ring interfere with the second bent piece in FIG. 3. FIG. 5 is a needle shape according to Embodiment 2 of the present invention. in roller bearing, a needle-shaped roller bearing according to a reference example of FIG. 6 present invention corresponding to FIG. 3, the needle roller bearing according to the third embodiment of FIG. 7 present invention corresponding to FIG. 3 Cross-sectional view showing the upper half [Fig. 8] Cross-sectional view showing the upper half of the conventional needle roller bearing [Description of symbols]
DESCRIPTION OF SYMBOLS 1 Outer cylinder 2 Shaft body 3 Needle roller bearing 4 Shell-shaped outer ring 5 Needle roller 6 Cage ring 4b First bent piece of outer ring 4c Second bent piece of outer ring 8c Chamfer of second bent piece

Claims (1)

A roller bearing disposed in an annular space formed between an outer cylinder and a shaft inserted through the outer cylinder,
A shell-shaped outer ring that is fitted and fixed to the inner peripheral surface of the outer cylinder and is manufactured by pressing a metal plate, and a plurality of outer rings arranged on the inner periphery of the outer ring and having the outer peripheral surface of the shaft body as an inner ring raceway And a retainer ring that is housed in the inner periphery of the outer ring and holds the roller at several locations around the circumference,
A radially inclined inwardly bent piece is provided at least on one side in the axial direction of the outer ring so as to be bent only at one place so as to fall inside the outer ring from the surface along the radial direction and extend linearly toward the tip. And
The end surface of the roller has a shape substantially parallel to a surface orthogonal to the rotation axis of the roller,
One end in the axial direction of the retainer ring is smaller than the diameter of a circle connecting the centers of the rollers, and is arranged on the inner diameter side of the bent piece of the outer ring with a predetermined gap,
Within the thickness range on the tip side of the bent piece, a roller guide surface that can come into contact with the end surface of the roller along the axial displacement of the rotating roller and a surface with respect to the outer peripheral surface of the cage ring. The cage guide surfaces that can come into contact with each other are chamfered, and the radial width of the roller guide surface and the axial width of the cage guide surface are formed to be smaller than the thickness of the bent piece, respectively. Has been a roller bearing.

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