JP2008208896A - Two-split outer ring and method for manufacturing two-split outer ring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a two-split outer ring easily assembled and integrally holdable for polishing after splitting, and a method for manufacturing two-split outer rings. <P>SOLUTION: The two-split outer ring 20 used for a roller bearing 1 is formed to be a pair of split pieces 2, 3 both of which have an approximately semicircular shape. The pair of split pieces 2, 3 are provided with through-holes 2h, 3h opposing to each other on the straight line orthogonal to the axial line when both circumferential end faces of the pair of split pieces 2, 3 are combined with each other and joined together to form an approximately cylindrical shape and penetrating to the radial direction so that both ends of a bar-shaped tool to integrally hold the pair of split pieces 2, 3 in the state of the cylindrical shape can be inserted into the through-holes 2h, 3h. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a two-part outer ring and a method for manufacturing the two-part outer ring.

  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

  However, the split machining is unstable and difficult to control and form the same dividing surface. For example, even if a defect occurs only on one side, it cannot be compensated for by another and the cost is high. turn into. On the other hand, by cutting the end portion in the form of a strip-shaped metal plate, the division surface can be obtained in a desired shape that is less likely to be displaced in the axial direction, but it is complicated to curve the metal plate into a semicircular shape It is. In addition, once these split bearing rings are split once to form two (a pair) split pieces, they cannot be held in a combined state, so the outer peripheral surface is subjected to a finishing process such as polishing. There is a dilemma that cannot be done.

  Therefore, a method of forming the split bearing ring by cutting rather than splitting the bearing ring is conceivable. However, as shown in FIG. 7 (7-1), for example, when the circular bearing ring 100 is cut along the straight line U by wire-cut electric discharge machining or the like, the bearing ring 100 is divided into two divided pieces 101 and 101. (See FIG. 7 (7-2)), but at this time, the part to be cut 101 a is scraped off by the wire. Accordingly, as shown in FIG. 7 (7-3), when the two divided pieces 101, 101 are combined again, the cut portion 101a disappears, so that the elliptical shape distorted from the shape of the bearing ring 100 before the division is obtained. turn into. Since it cannot hold | maintain in the state which combined the two division | segmentation pieces 101 and 101, there is a dilemma that an outer peripheral surface cannot be grind | polished circularly and cannot be used as an outer ring | wheel of a roller bearing in this state. .

  The present invention has been made in view of the above circumstances, and provides a two-part outer ring that is easy to assemble and can be integrally held for polishing even after being divided, and a method for manufacturing the two-part outer ring. It is to provide.

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
A two-part outer ring used for roller bearings,
Both are formed to be a pair of divided pieces having a substantially semi-cylindrical shape,
The pair of split pieces are radial so that they face each other on a straight line perpendicular to the axis when the circumferential ends of the pair of split pieces are combined with each other so that they form a cylindrical shape. A through-hole penetrating in the direction is formed.

Moreover, in order to solve the said subject, the two-part outer ring of this invention is
A two-part outer ring used for roller bearings,
Both are formed to be a pair of divided pieces having a substantially semi-cylindrical shape,
When the pair of divided pieces are combined with each other in a circumferential state so that the pair of divided pieces have a substantially cylindrical shape, the opposing pieces are opposed to each other on a straight line orthogonal to the axis line, A through-hole penetrating in the radial direction capable of fitting both ends of a rod-shaped jig for integrally holding the pair of divided pieces in a cylindrical shape is formed.

Moreover, in order to solve the said subject, the manufacturing method of the 2-part outer ring of this invention is the following.
A method of manufacturing a split outer ring used for a roller bearing,
A through hole forming step for forming a through hole that penetrates in a radial direction so as to face a cylindrical bearing ring that is supposed to be an outer ring of a roller bearing on a straight line orthogonal to the axis;
A splitting process in which the bearing ring is split or cut, both of which include a through-hole and split into a pair of split pieces having a substantially semi-cylindrical shape;
The pair of divided pieces are combined in a circumferential state with both circumferential end surfaces so that they have a substantially cylindrical shape, and both ends of the rod-shaped jig are respectively fitted into through-holes facing each other in a straight line. A holding step of holding the divided pieces integrally in a substantially cylindrical shape;
In a state where the pair of divided pieces are integrally held by the holding step, a polishing step for polishing to adjust the outer peripheral surface of the cylindrical shape collapsed during the dividing step;
It is characterized by providing.

  According to the present invention, the pair of divided pieces having a substantially semi-cylindrical shape are formed with through holes penetrating in the radial direction. And the through-hole is formed so that it may oppose on the straight line orthogonal to an axis line, when a pair of division | segmentation piece is combined. According to this, since both ends of the rod-shaped jig can be fitted into the opposing through holes, the pair of divided pieces can be held in a substantially cylindrical shape via the rod-shaped jig, and the outer peripheral surface is polished. Can be processed.

  Therefore, for example, as described above, the cutting allowance is eliminated by the cutting process, and the deviation or distortion generated when the pair of divided pieces are combined can be eliminated, such as when the shape before cutting is not obtained even when combined again. That is, since processing can be performed even after the division, it is possible to provide a reliable and good two-part outer ring. Further, it is also suitable when the split piece is deformed due to stress release that occurs when the split piece is formed by split processing, or when the split piece is formed by curving a metal plate.

  Further, the through hole in the two-part outer ring can be formed in a substantially intermediate region in the circumferential direction of the divided piece. Thereby, both ends of the rod-shaped jig can be easily press-fitted (inserted).

  Furthermore, at least one of the through holes in the two-split outer ring can also be used as a positioning hole corresponding to a positioning pin provided at a predetermined assembly location.

  That is, it is possible to include an assembling step for assembling at least one of the through holes in the split outer ring as a positioning hole corresponding to a positioning pin provided at a predetermined mounting location after the polishing step.

  In this way, by using the holding through hole at the time of polishing also as the positioning hole at the mounting location, it is not necessary to separately form the positioning hole, and the manufacturing cost can be reduced. Moreover, since the through-hole is formed in both of a pair of division | segmentation pieces, it becomes possible to position in any division | segmentation piece, and an assembly | attachment becomes easier. As a result, since at least two through holes are formed, one can be used as a positioning hole and the other can also be used as an oil hole.

  Therefore, it is possible to form a roller bearing that provides the split outer ring of the present invention having the above-described configuration. That is, by performing processing after the division, it is possible to realize a roller bearing having a reliable two-part outer ring that is reliable.

  Hereinafter, embodiments of a roller bearing and a two-part outer ring according to the present invention will be described 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 the assembled state in FIG. 2, and FIG. 4 is a perspective view, a cross-sectional view taken along the line XX, and a cross-sectional view taken along the line Y-Y according to the embodiment of the present invention.

  As shown in FIG. 1, the roller bearing 1 is arranged inside a two-part outer ring 20 composed of a pair of split pieces 2, 3 having a substantially semi-cylindrical shape, and the pair of split pieces 2, 3. Are provided with a plurality of rollers 4 whose inner circumferential surface is the raceway surface, and a pair of cages 5 and 6 having a semi-cylindrical shape for holding each roller 4. The cages 5 and 6 are provided with a plurality of pocket portions P penetrating inward and outward in the radial direction at equal intervals along the circumferential direction, and the rollers 4 are accommodated in the pocket portions P, respectively.

  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 two-split outer ring 20 composed of a pair of split pieces 2 and 3 rotates integrally with the connecting rod 9, and the crankpin 72 is connected as an inner ring so as to be relatively rotatable.

  Next, the split outer ring 20 will be described in detail with reference to FIG. The upper divided piece in the figure will be described as the first divided piece 2, and the lower divided piece will be described as the second divided piece 3. As described above, the two-divided outer ring 20 is formed by the first and second divided pieces 2 and 3 having a substantially semi-cylindrical shape. As shown in FIG. 4 (b), the two-part 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, 3a of the second divided piece 3 are combined in a palm-like state and formed in a cylindrical shape. And the 1st and 2nd dividing line L1, L2 is formed in the 2 division | segmentation outer ring | wheel 20 (refer Fig.4 (a)).

  Further, the first and second divided pieces 2 and 3 have through holes 2h penetrating in the radial direction (radial direction) so as to face the other side on a straight line orthogonal to the axis O1 (for example, on the straight line O2). 3h is formed. These through-holes 2h and 3h are temporarily fixed by holding both ends of the rod-shaped jig together and fitting them together so that the first and second divided pieces 2 and 3 have a cylindrical shape. Is to do.

  The through holes 2h and 3h are preferably formed in a substantially intermediate region in the circumferential direction of the first and second divided pieces 2 and 3. Thereby, the 1st and 2nd division | segmentation pieces 2 and 3 can be hold | maintained in the state combined stably. A plurality of through holes formed in one divided piece may be provided. At least one of the through holes 2h and 3h can be used as a positioning hole corresponding to a positioning pin (not shown) provided at a predetermined mounting location. For example, a positioning pin (not shown) is provided in the concave portion 91a of the main body portion 91 or the concave portion 92a of the cap portion 92 at the large end portion 9B of the connecting rod 9, and is positioned when assembled. Further, a hole (through hole) may be provided in a shaft (crank pin or the like) or a cage to temporarily hold (temporarily fix).

  Here, the first and second dividing lines L1 and L2 are desirably formed in a non-linear shape that is curved or bent with respect to the direction of the axis O1. Thereby, the shift | offset | difference with respect to the axial direction at the time of an assembly | attachment can be suppressed or prevented effectively. In this embodiment, as shown in FIG. 4C, the second dividing line L2 has an inverted N-shape (S) including vertices P and Q one above and below the axis O1 when viewed from the Y direction. (Shape). On the other hand, the first parting line L1 is formed so as to be point symmetric at the center of the parting line L2 and the two-part outer ring 20. Thereby, it becomes possible to share.

  Next, a method for manufacturing a two-part outer ring according to the present invention will be described with reference to FIGS. First, as shown in FIG. 5 (5-1), a cylindrical bearing ring 21 is formed by a known forming method using a metal material such as JIS standard SCM415 or JIS standard SPCC, and the bearing is formed by a drill or the like. The through holes 2h and 3h that penetrate in the radial direction (radial direction) facing each other on a straight line orthogonal to the axis of the ring 21 are drilled.

  Next, as shown in FIG. 5 (5-2), the bearing ring 21 is cut by a cutting device such as a wire cut electric discharge machine. As a position to cut at this time, both are divided into a pair of divided pieces 2 and 3 having a substantially semi-cylindrical shape including a through hole. Specifically, the 1st and 2nd division | segmentation pieces 2 and 3 are cut | disconnected so that the through-holes 2h and 3h may become an intermediate area of each circumferential direction. In addition, the cut surfaces (both end surfaces) 2a, 2b, 3a, 3b of the first and second divided pieces 2, 3 are not limited to the cut shape described above by being cut by a cutting device, and may be any shape. Can be cut. In addition, the 1st and 2nd division | segmentation pieces 2 and 3 have comprised the form by which the to-be-cut parts 2c and 3c were scraped off with the wire.

  Subsequently, as shown in FIG. 5 (5-3), a rod-shaped jig 30 having a thickness corresponding to the through holes 2 h and 3 h is prepared and sandwiched between the first and second divided pieces 2 and 3. A rod-shaped jig 30 is disposed on the surface. Then, as shown in FIG. 6 (6-1), both end portions 30a, 30b of the rod-shaped jig 30 are press-fitted (inserted) into the corresponding through holes 2h, 3h, and the first and second divided pieces 2, 3 are integrally held in a state of being combined with each other so as to have a substantially cylindrical shape. At this time, the combined first and second divided pieces 2 and 3 are not rounded in a side view as indicated by an imaginary line because the cut portions 2c and 3c are cut off during the cutting process. It has an elliptical shape.

  Then, as shown in FIG. 6 (6-2), the outer peripheral surfaces 2s and 3s are polished (for example, as shown in FIG. 6) in a state where the first and second divided pieces 30 are integrally held by the rod-shaped jig 30. The middle broken line portion is cut and polished, and processed (adjusted) so as to form a cylindrical shape (circular shape in a side view). Then, after removing the rod-shaped jig 30, the first and second divided pieces 2 and 3 are pressed into the annular jig 40 from the axial direction and held inside the annular jig 40. Polishing the surface (for example, cutting and polishing the broken line portion in the figure) and processing (adjusting) the cylindrical jig 40 so as to form a cylindrical shape (a circular shape in a side view as indicated by the phantom line). The two-part outer ring 20 having a highly accurate cylindrical shape can be formed by removing.

  That is, a highly accurate roller bearing can be formed by disposing a roller and a cage inside the two-split outer ring 20 (see FIG. 1).

  Further, since the first and second divided pieces 2 and 3 have through holes 2h and 3h, respectively, pins (positioning pins) corresponding to the through holes 2h and 3h are provided at predetermined mounting locations. The two-part outer ring 20 is assembled using the through holes 2h and 3h as positioning holes. As a result, the roller bearing provided with the split outer ring 20 can be easily assembled.

  Thus, by simply providing a through hole in the pair of divided pieces, finishing adjustment such as polishing can be easily performed after forming the pair of divided pieces in the two-part outer ring, so that it is inexpensive and highly accurate. A two-part outer ring can be formed.

  In addition, in this invention, it is not limited to the said Example, It can also be set as the Example variously changed within the range of this invention according to the objective and the use. For example, in this embodiment, the cutting process is exemplified as a means for dividing the bearing ring. However, the present invention is also effective when the bearing ring is deformed due to stress release when the bearing ring is divided by the split process. In addition, the order of the polishing process (finishing process) between the outer peripheral surface and the inner peripheral surface in the pair of split pieces combined in the hand-held state may be from either.

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 perspective view, XX sectional drawing, and YY sectional drawing of the two-part outer ring which concern on embodiment of this invention. Explanatory drawing which shows the manufacturing process of a two-part outer ring. The figure which shows the manufacturing process of the split outer ring following FIG. The figure which shows the cutting process of a bearing ring.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Roller bearing 2 1st division | segmentation piece 2h, 3h Through-hole 3 2nd division | segmentation piece 4 Roller 5, 6 Cage O1 Axis line

Claims (3)

A two-part outer ring used for roller bearings,
Both are formed to be a pair of divided pieces having a substantially semi-cylindrical shape,
When the pair of divided pieces are combined with both ends in the circumferential direction so as to have a cylindrical shape, the pair of divided pieces are opposed to the other side on a straight line perpendicular to the axis. A two-part outer ring characterized in that a through-hole penetrating in the radial direction is formed. A two-part outer ring used for roller bearings,
Both are formed to be a pair of divided pieces having a substantially semi-cylindrical shape,
The pair of divided pieces are opposed to the other side on a straight line orthogonal to the axis when the circumferential ends of the pair of divided pieces are combined with each other so as to be substantially cylindrical. A two-part outer ring characterized in that a through-hole penetrating in the radial direction into which both ends of a rod-like jig for holding the pair of divided pieces integrally in a cylindrical shape can be fitted is formed. A method of manufacturing a split outer ring used for a roller bearing,
A through-hole forming step of forming a through-hole penetrating in a radial direction so as to face a cylindrical bearing ring that is supposed to be an outer ring of the roller bearing on a straight line orthogonal to the axis;
A splitting process in which the bearing ring is split or cut, both of which include the through-hole and split into a pair of split pieces having a substantially semi-cylindrical shape,
Combining both ends of the circumferential direction of the pair of split pieces into a substantially cylindrical shape in a palmed state, and inserting both ends of the rod-shaped jig into the through holes opposed on the straight line, A holding step for integrally holding the pair of divided pieces in a substantially cylindrical shape;
A polishing step for polishing in order to adjust the outer peripheral surface of the cylindrical shape collapsed during the dividing step, with the pair of divided pieces held integrally by the holding step;
A method of manufacturing a two-part outer ring, comprising:

Images