JP2008223951A - Two-split outer ring and roller bearing using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a two-split outer ring which suppresses an axial shift, and can be easily attached to a designated mounting place even when these segments are greatly curved, or bent in both ends partitioned surfaces. <P>SOLUTION: The outer ring is characterized in that segments 2, 3 are formed by partitioning a cylinder element planed to constitute a two-split outer ring 20 with a partition line which is meandered at a designated sway width or bent in an axial line O1 direction, in that tips of the partitioned surfaces formed in circumferential both ends are formed so that a center angle might be 180 degrees or more in big circular arc viewed from the axial line O1 direction, and in that in inner peripheral surfaces of the segments 2, 3, viewed from the axial line O1, a minimum space in inner peripheral surfaces facing each other from both ends locations of designated circular arc portion in which a center angle is 180 degrees to each tip is formed at inner diameters of the segments 2, 3 or more. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a two-part outer ring divided into two in the circumferential direction and a roller bearing including the same.

  In general, for example, a large end portion of a connecting rod (hereinafter referred to as a connecting rod) that is a connecting rod that connects a piston and a crankshaft in an engine is coupled to the crankshaft with a bearing interposed therebetween. For the bearing, for example, a split bearing ring (outer ring) divided into two parts is used due to the characteristics of the crankshaft.

By the way, when the divided bearing rings are formed in a straight line, the divided bearing rings are liable to be displaced in the axial direction at the time of assembly and are not handled well. For this reason, it is desired to be a split surface that is curved or bent, for example, in an S shape with respect to the axial direction. Then, the technique of patent document 1 forms the recess which induces a split in the outer peripheral surface of a bearing ring, presses a bearing ring with a pressurization jig aiming at the recess, and along a recess. A dividing method for dividing into two divided pieces is disclosed. Moreover, the technique of patent document 2 is disclosing the method of curving the strip | belt-shaped metal plate which makes an uneven | corrugated shape in the length direction at an edge part, and forming a semicircle-shaped division piece.
JP 54-163247 A JP 2005-337352 A

  When dividing the bearing ring due to technology improvements, the split surface can be greatly bent or bent with respect to the axial direction, and the axial shift can be effectively prevented. As a result, another assembling problem has arisen.

  For example, in each of the divided pieces, the divided surfaces are interlaced with each other in the circumferential direction, so that the center angle is formed as an arc larger than 180 degrees when viewed from the side. Specifically, as shown in FIG. 8A, the split piece 100 has a semicircular arc (a central angle of 180 degrees) on the right side of the straight line Y orthogonal to the axis Z, and the split surface 101 portion is a straight line Y. It is formed to extend to the left side. At this time, as shown in FIG. 8B, the opening width d at the tip 101 a of the dividing surface 101 is smaller than the inner diameter D of the inner peripheral surface 100 a of the dividing piece 100. Therefore, as shown in FIG. 9, for example, when the split piece 100 (outer ring) placed in a connecting rod (not shown) or the like is fitted into a cage CR with rollers wound around a crankshaft (not shown), the rollers The outer diameter of the attached cage CR is D (equivalent to the inner diameter D of the split piece 100) because the roller uses the inner peripheral surface 100a as the raceway surface, and the opening width d from the direction of the straight line X (see FIG. 8A). Is smaller than the outer diameter D, there is a problem that the tip 101a becomes an obstacle and the assemblability is poor.

  By the way, in Patent Document 2, since the end portion is cut in the form of a strip-shaped metal plate, and the metal plate is bent into a semicircular shape, a straight shape is formed at both ends thereof, and the metal plate is attached when attached to a housing. The straight portion is elastically deformed inward, but it is complicated.

  The present invention has been made in view of the above circumstances, and is divided into two parts that can be easily assembled at a predetermined mounting location even if the divided surfaces of both ends are largely curved or bent with the axial deviation suppressed. The object is to provide an outer ring and a roller bearing used therefor.

Means for Solving the Problems and Effects of the Invention

In order to solve the above problems, the two-part outer ring of the present invention is
It has a raceway surface for receiving rollers on the inner peripheral surface, and is divided into two in the circumferential direction, and is formed into a cylindrical shape by combining those divided pieces,
The split piece is formed by dividing a cylindrical material that constitutes a two-split outer ring into split lines that meander or bend with a predetermined swing width in the axial direction, and has a central angle of 180 degrees when viewed from the axial direction. The tip of the split surface formed at both ends in the circumferential direction is formed so as to be a larger arc,
On the inner peripheral surface of the divided piece, when viewed from the axial direction, the minimum interval on the opposed inner peripheral surface from the both end positions of the predetermined arc portion having a central angle of 180 degrees to each tip is formed to be equal to or larger than the inner diameter of the divided piece It is characterized by being.

  According to the two-split outer ring according to the present invention, the two divided pieces forming the outer ring are formed by being divided by a dividing line that meanders or bends with a predetermined swing width, and the divided piece is centered when viewed from the axial direction. An arc having an angle greater than 180 degrees is formed. The inner circumferential surface of the divided piece has a minimum interval on the opposed inner circumferential surface from the both end positions to each tip of a predetermined arc portion (when viewed from the axial direction) having a central angle of 180 degrees. It is formed with a diameter equal to or greater than the inner diameter of the peripheral surface. That is, the inner peripheral surface of the split piece has a semicircular bottom portion, and the inner peripheral surface adjacent to both ends of the bottom portion serves as a guide surface, and the bottom portion is opened. Accordingly, it is possible to easily dispose a roller-equipped cage whose inner peripheral surface is a raceway surface at a position corresponding to the bottom.

  As a result, in order to improve the workability at the time of assembling, it is possible to implement the split piece having the split surface curved or bent with respect to the axial direction without increasing the number of split pieces. For example, if the cylindrical material is divided so as to meander or bend in two circumferential directions with respect to the dividing line when dividing the cylindrical material by a plane including the axis, an arc larger than the central angle of 180 degrees is formed in both divided pieces. Will do. In that case, the internal peripheral surface in each division | segmentation piece is set as the said structure, and the same effect is enjoyed.

In addition, the two-part outer ring of the present invention can be changed from the viewpoint of
It has a raceway surface for receiving rollers on the inner peripheral surface, and is divided into two in the circumferential direction, and is formed into a cylindrical shape by combining those divided pieces,
The split piece is formed by dividing a cylindrical material that constitutes a two-split outer ring into split lines that meander or bend with a predetermined swing width in the axial direction, and has a central angle of 180 degrees when viewed from the axial direction. The tip of the split surface formed at both ends in the circumferential direction is formed so as to be a larger arc,
On the inner peripheral surface of the divided piece, the inner peripheral surface from the both end positions to the tip end of the predetermined arc portion having a central angle of 180 degrees is formed so as not to enter the inner side of the tangent line at the both end positions when viewed from the axial direction. It is characterized by.

  According to the two-split outer ring according to the present invention, the two divided pieces forming the outer ring are formed by being divided by a dividing line that meanders or bends with a predetermined swing width, and the divided piece is centered when viewed from the axial direction. An arc having an angle greater than 180 degrees is formed. And the inner peripheral surface of the divided piece has an inner peripheral surface from both end positions to each end of a predetermined arc portion (when viewed from the axial direction; the bottom portion) having a central angle of 180 degrees than the tangent line at the both end positions. It is formed so as not to enter inside. That is, the inner peripheral surface from the both end positions of the bottom part which makes | forms a semicircle shape to the front-end | tip is linearly formed along this tangent direction at least. As a result, there is no portion where the interval is narrower than the inner diameter between the opening and the bottom of the tip, and for example, a roller cage with an inner peripheral surface at the position corresponding to the bottom is easily arranged. can do.

  Further, on the inner peripheral surface of the split piece of the two-split outer ring, the linear interval connecting the tip portions on both sides as viewed from the axial direction is formed so as to increase toward the tip side. Can do. In addition, the divided pieces in the two-divided outer ring can be configured to be formed symmetrically with respect to a straight line that is orthogonal to the straight line connecting the tip portions on both sides when viewed from the axial direction. Thereby, since it is formed so as to be before the assembly, it is guided when the roller cage or the like is arranged, and the assembly is improved. Moreover, it can manufacture collectively by forming the front-end | tip part of both sides symmetrically, and can suppress manufacturing cost.

  Accordingly, a roller bearing is provided that includes the two-split outer ring of the present invention having the above-described configuration, and has a plurality of rollers having the inner peripheral surface as a raceway surface inside the two-split outer ring and a cage that holds each roller. can do. That is, it is possible to realize a roller bearing that provides a two-part outer ring excellent in assembling workability.

  Embodiments of a roller bearing according to the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing an example of a roller bearing according to an embodiment of the present invention and an exploded perspective view partially omitted. FIG. 2 is an exploded perspective view showing a state in which the roller bearing is assembled between a crankshaft and a connecting rod large end. 3 is a cross-sectional view showing a state in which the roller bearing is incorporated in FIG. 2, FIG. 4 is a side view and a front view of the split piece constituting the outer ring, and FIG. 5 is a side cross-sectional view of the outer ring combining the split pieces. is there.

  As shown in FIG. 1, the roller bearing 1 includes a two-divided outer ring 20 (hereinafter, abbreviated as an outer ring) composed of a pair of divided pieces 2 and 3 having a substantially semi-cylindrical shape, and the pair of divided pieces 2 and 3. A plurality of rollers 4 disposed on the inner side and having the inner peripheral surface of the pair of split pieces 2 and 3 as raceway surfaces, and a pair of split cages 5 and 6 having a semi-cylindrical shape for holding the rollers 4. I have. In the divided cages 5 and 6, a plurality of pocket portions P penetrating inward and outward in the radial direction are provided at equal intervals along the circumferential direction, and the rollers 4 are accommodated in the respective pocket portions P.

  As shown in FIG. 2, the roller bearing 1 divided into two parts is used when the connecting rod 9 is coupled to a crankshaft 7 including a crank journal 71, a crankpin 72, a counterweight 73, etc. in an engine of a vehicle such as an automobile. Used for. That is, it is used when an integral bearing that is press-fitted from the axial direction and disposed at the mounting location cannot be used. Specifically, it is interposed between the large end portion 9B of the connecting rod 9 and the crank pin 72 (see FIG. 3). The connecting rod 9 is a connecting rod that connects the crankshaft 7 and the piston 8, and plays a role of converting the reciprocating motion of the piston 8 into the rotational motion of the crankshaft 7.

  The connecting rod 9 includes a large end 9B coupled to the crankpin 72 (crankshaft 7) and a small end (not shown) coupled to the piston 9 at both ends. The connecting rod 9 includes a small end portion (not shown), a part of the large end portion 9B, a main body portion 91 including a rod 9R that connects them, a cap portion 92 that forms the remainder of the large end portion 9B, and a cap. And a nut 93 for fixing the portion 92 to the main body portion 91. A bolt 91 b corresponding to the nut 93 is formed in the main body portion 91 and is fastened through a bolt insertion hole 92 b formed in the cap portion 92.

  As shown in FIG. 3, the large end 9B is combined with a substantially semicircular recess 91a provided in the main body 91 and a substantially semicircular recess 92a provided in the cap 92. In this state, the roller bearing 1 is held. That is, the outer ring 20 constituted by the pair of split pieces 2 and 3 rotates integrally with the connecting rod 9, and the crank pin 72 is connected as an inner ring so as to be relatively rotatable.

  Returning to FIG. 1, the outer ring 20 will be described in detail. The upper divided piece in FIG. 1 is referred to as a first divided piece 2, and the lower divided piece is referred to as a second divided piece 3. As described above, the outer ring 20 is formed by the first and second divided pieces 2 and 3 having substantially the same semi-cylindrical shape. The first and second divided pieces 2, 3 are divided by splitting or cutting in the axial direction (axial direction) of a bearing rod (cylindrical material) formed in a cylindrical shape that constitutes the outer ring 20. Is formed.

  As shown in FIG. 1A, the outer ring 20 includes first and second divided pieces 2, 3 having both end surfaces in the circumferential direction, specifically, divided surfaces 2 a, 2 b in the first divided piece 2. And the divided surfaces 3b and 3a of the second divided piece 3 are combined in a palm-like state and formed in a cylindrical shape (see FIG. 1B).

  Here, the first and second divided pieces 2 and 3 are desirably formed in a non-linear shape that is curved (meandering) or bent (bent) with respect to the direction of the axis O1 (see FIG. 4). Thereby, the shift | offset | difference with respect to the axial direction at the time of assembling | attaching to the crankshaft 7, the connecting rod 9, etc. can be suppressed or prevented effectively. In this embodiment, as shown in FIG. 1B, one of the outer rings 20 protrudes in the circumferential direction so that the dividing line formed when the divided pieces 2 and 3 are combined is V-shaped. One is formed to be recessed. The split surfaces 2a and 3a are formed with tip portions 2p and 3p projecting in the center in the width direction, and the split surfaces 2b and 3b are formed with tip portions 2q and 3q projecting on both sides in the width direction.

  Next, each divided piece forming the outer ring 20 will be described in detail with reference to FIG. In addition, since the 1st and 2nd division | segmentation pieces 2 and 3 are substantially equivalent shapes, it demonstrates using the 1st division | segmentation piece 2, and abbreviate | omits description about the 2nd division | segmentation piece 3. FIG. As shown in FIG. 4 (a), the first divided piece 2 has divided surfaces 2a and 2b formed at both ends in the circumferential direction so that the central angle is an arc larger than 180 degrees when viewed from the direction of the axis O1. 2b tip portions 2p and 2q are formed. And the inner peripheral surface 2c of the 1st division | segmentation piece 2 does not enter the inner peripheral surface from the both end positions of the predetermined circular arc part whose center angle is 180 degree | times to the front-end | tip parts 2p and 2q rather than the tangent in the both end positions. It is formed as follows.

  Specifically, since the first divided piece 2 has a circular arc whose central angle is larger than 180 degrees, as shown in FIG. 4A, the first divided piece 2 straddles both the left and right sides of the straight line L1 orthogonal to the axis O1. Is formed. That is, the first divided piece 2 is formed to include an arc portion having a central angle of 180 degrees on the right side of the straight line L1 and an arc portion protruding by a length w on the left side. In addition, the inner peripheral surface 2c of the first divided piece 2 has an inner peripheral surface from both ends A and B of the arc portion having a central angle of 180 degrees to the tip portions 2p and 2q by a polishing process or the like as guide surfaces 2s, 2s.

  The guide surfaces 2s and 2s are formed smoothly so as to extend linearly along the tangent lines L2 and L3 at both end portions A and B (see FIG. 4B). Moreover, the thickness of the part corresponding to the guide surfaces 2s and 2s of the 1st division | segmentation piece 2 is formed thinner than the thickness of a track | orbit part. Further, the distance between the opposing guide surfaces 2 s and 2 s is the same as the inner diameter of the first divided piece 2. According to this, the inner peripheral surface 2c of the first divided piece 2 is formed in a so-called U-shape.

  Further, the inner peripheral surface 2c of the first divided piece 2 has an interval in the linear direction (in the present embodiment, the direction of the straight line L1) connecting the distal end portions 2p and 2q on both sides when viewed from the direction of the axis O1. It is formed so as to become larger toward the side. Furthermore, the 1st division | segmentation piece 2 is formed symmetrically with respect to the straight line orthogonal to the straight line which connects the front-end | tip parts 2p and 2q of both sides, and orthogonal to the axis line O1. As a result, as shown in FIG. 5, when the outer ring 20 is formed by combining the first and second divided pieces 2 and 3, the weight balance can be achieved as a whole, which can contribute to stable rotation. . Further, when the outer ring 20 is formed, the end portions of the divided pieces 2 and 3 are interlaced with each other, so that the raceway surface can be configured without gaps in the circumferential direction, and vibrations and abnormal noise caused by the roller run-up can be generated. Generation | occurrence | production can be suppressed or prevented effectively.

  That is, the first divided piece 2 has opposed inner peripheral surfaces 2s, 2s from the both end positions of the predetermined arc portion having a central angle of 180 degrees to the respective tip portions 2p, 2q on the inner peripheral surface 2c of the first divided piece 2. Is formed to be equal to or larger than the inner diameter of the first divided piece 2.

  When the divided cages 5 and 6 for holding the rollers 4 having the inner peripheral surface 2c as the raceway surface are disposed on the first divided piece 2 (see FIG. 9), the rollers 4 and the like are guided by the guide surfaces 2s, Since it is guided by 2 s, or the rollers 4 and the like can be arranged by being fitted relatively straight from the radial direction without contacting the guide surfaces 2 s, 2 s. That is, there is no part that becomes an obstacle when the divided cages 5 and 6 are arranged, and the assembly efficiency is excellent and the working efficiency is improved. Thereby, the roller bearing 1 excellent in assemblability can be obtained (see FIG. 1).

  Specifically, as shown in FIG. 2, when the outer ring 20 is interposed between the crankshaft 7 and the connecting rod 9, for example, the split cages 5 and 6 holding the rollers 4 are wound around the crankshaft 7. In the attached state, the split cages 5 and 6 can be easily fitted between the first and second split pieces 2 and 3. That is, as shown in FIG. 3, the roller bearing 1 can be easily interposed between the crankshaft 7 and the connecting rod 9, and the roller bearing 1 excellent in assembling property can be obtained.

  Next, another embodiment of the two-split outer ring according to the present invention will be described with reference to FIGS. In the following description, portions different from the above-described embodiment will be mainly described, and overlapping portions will be denoted by the same reference numerals and description thereof will be omitted or simplified. First, as shown in FIG. 6, as a first aspect of another embodiment, the split piece 200 includes, for example, each tangent L5 from intersections C and D that intersect a straight line L4 orthogonal to the axis O1 on the inner peripheral surface 2c. , L6, guide surfaces 20s and 21s are formed. Although the split piece 200 has an arc portion with a central angle of 180 degrees on the right side of the straight line L4 in the drawing, the lengths of the two guide surfaces 20s and 21s extending to the left side are different. Also in this case, since the minimum distance between the two guide surfaces 20 s and 21 s secures a length that is equal to or larger than the inner diameter, a cage for holding a roller having the inner peripheral surface 2 c as a raceway surface inside the divided piece 200. It can be easily fitted.

  As shown in FIG. 7, as a second aspect of the other embodiment, the split piece 300 is, for example, from a position (for example, point E and point F) where the guide surfaces 22s and 23s enter the right side of the straight line L1. Is formed. Thereby, since a space | interval becomes reliably wider than the holder | retainer holding the roller which uses the internal peripheral surface 2c as a track surface inside the division | segmentation piece 200, it is possible to fit the holder | retainer easily.

  In addition, in this invention, it is not limited to the said embodiment, It can also be set as the embodiment variously changed within the range of this invention according to the objective and the use. For example, in the above-described embodiment, the guide surface is formed so as to extend linearly in each tangential direction when viewed from the side, but may be curved so as not to enter the inside of the tangent.

The side view which shows an example of the roller bearing which concerns on embodiment of this invention, and the disassembled perspective view which abbreviate | omitted one part. The exploded perspective view which shows the state which incorporates a roller bearing between a crankshaft and a connecting rod large end part. Sectional drawing which shows the state assembled in FIG. The side view and front view of a division | segmentation piece. Side sectional view of a two-part outer ring. The side view of the division piece which concerns on 1st other embodiment. The side view of the division piece which concerns on 2nd other embodiment. The side view and front view of the conventional division | segmentation piece. The figure which shows the attachment process which concerns on the conventional division | segmentation piece.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Roller bearing 2 1st division | segmentation piece 2c Inner peripheral surface (track surface)
3 Second piece 4 Roller 5, 6 Divided cage (Cage)
20 Outer ring (2 split outer ring)
O1 axis

Claims (4)

It has a raceway surface for receiving rollers on the inner peripheral surface, and is divided into two in the circumferential direction, and is formed into a cylindrical shape by combining those divided pieces,
The split piece is formed by dividing a cylindrical material that constitutes the two-split outer ring with a split line that meanders or bends with a predetermined swing width in the axial direction, and has a central angle when viewed from the axial direction. The tip of the split surface formed at both ends in the circumferential direction is formed so as to be an arc larger than 180 degrees,
On the inner peripheral surface of the divided piece, the minimum interval on the opposing inner peripheral surface from the positions of both ends of the predetermined arc portion with a central angle of 180 degrees when viewed from the axial direction to each tip is formed to be equal to or larger than the inner diameter of the divided piece The outer ring is divided into two parts. It has a raceway surface for receiving rollers on the inner peripheral surface, and is divided into two in the circumferential direction, and is formed into a cylindrical shape by combining those divided pieces,
The split piece is formed by dividing a cylindrical material that constitutes the two-split outer ring with a split line that meanders or bends with a predetermined swing width in the axial direction, and has a central angle when viewed from the axial direction. The tip of the split surface formed at both ends in the circumferential direction is formed so as to be an arc larger than 180 degrees,
On the inner circumferential surface of the divided piece, the inner circumferential surface from the both end positions of the predetermined arc portion having a center angle of 180 degrees to each tip end does not enter inside the tangent line at the both end positions when viewed from the axial direction. The outer ring is divided into two parts.   The inner circumferential surface of the divided piece is formed so that the distance in the linear direction connecting the tip portions on both sides as viewed from the axial direction becomes larger toward the tip side. Two split outer ring.   A two-part outer ring according to any one of claims 1 to 3, comprising a plurality of rollers having the inner peripheral surface as a raceway surface inside the two-part outer ring, and a cage for holding each roller. A roller bearing characterized by that.

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