JP6511815B2 - Manufacturing method of split type bearing ring - Google Patents

Description

The present invention relates to the production how the split bearing ring for use in split bearings.

  Conventionally, split type bearings are adopted for bearings that support an integral crankshaft, camshaft, balancer, etc. for free rotation, large diameter end bearings of con rods, etc. There is. As a split type bearing ring of such a split type bearing, there is known a manufacturing method in which a strip-like steel plate is bent and formed (see, for example, Patent Document 1). In addition, as shown in FIG. 4, after manufacturing a ring-shaped bearing ring 102 having a ridge 101 at the side edge and having a polishing notch 105 at the base of the ridge 101, the ridge 101 is formed at the side edge of the bearing ring 102. A notch 106 is provided for the width, and a split groove 107 continuing from the notch 106 is formed over the entire width of the rolling surface on the rolling surface of the race 102 on the rolling surface side. Apply to finish the width, outer diameter and rolling surface. Then, a bearing ring manufacturing method is known in which the bearing ring 102 is axially divided along the split groove 107 by radially pressing the bearing ring 102 between the pair of pressure members 108 and 109 (for example, , Patent Document 2).

Unexamined-Japanese-Patent No. 2006-200673 Patent No. 3046645

  However, according to Patent Document 1, since the radial thickness of the outer ring depends on the thickness of the material, the dimensional tolerance (for example, ± 0.03 mm or more) applied to the thickness of a normal plate material It is difficult to ensure the inscribed circle diameter accuracy required for the outer ring of the needle bearing. Further, according to Patent Document 2, a step of compressing the turning ring 102 having the wedge 101 at the side edge one by one and dividing it in the axial direction along the dividing groove 107 is necessary, which causes problems in mass productivity and cost. There is. Further, the manufacturing method of Patent Document 2 is difficult to apply to a bearing ring other than a turning bearing ring 102 having a weir 101 at the side edge and having a grinding notch 105 at the base of the weir 101.

The present invention has been made in view of the above-described problems, and an object thereof is a split type capable of manufacturing a high-precision split-type race at low cost without depending on the thickness tolerance of the material. is to provide a manufacturing how race.

The above object of the present invention is achieved by the following constitution.
(1) A method of manufacturing a split type bearing ring,
Drawing a plate-like material to form a cylindrical material;
Forming a slit portion extending in the axial direction to the vicinity of both axial end portions of the cylindrical material at two places separated in the circumferential direction of the cylindrical material;
Forming a pair of bearing ring split pieces from the cylindrical material by cutting and removing the connection between the axial end of the cylindrical material and the slit;
Equipped with
The connecting portion is provided axially outside the raceway surface of the bearing ring,
The method for manufacturing a split type bearing ring, wherein the slit portions have the same shape in which circumferential end portions opposed in the circumferential direction can be in contact with each other, and are formed by one processing.
(2) The split type according to (1), wherein the drawing process forms 5% to 20% of the thickness of the plate-like material to form the cylindrical material from the plate-like material. Bearing ring manufacturing method.
(3) The pair of raceway ring split pieces are formed in a cylindrical shape by contacting circumferential end portions of the slit portion with each other,
In the drawing process, the circumferential length of the outer circumferential surface of the cylindrical material corresponds to the circumferential length of the outer circumferential surface of the pair of bearing ring split pieces combined in a cylindrical shape. The method according to (1) or (2), wherein the method is performed so as to have a length obtained by adding a length twice a direction width .

According to the method of manufacturing a split type bearing ring of the present invention, the step of drawing a plate-like material to form a cylindrical material, the axis of the cylindrical material at two places separated in the circumferential direction of the cylindrical material Forming a slit extending in the axial direction to near both ends of the direction, cutting and removing the connection between the axial end of the cylindrical material and the slit to obtain a pair of raceway ring segments from the cylindrical material And the forming step, so that an accurate divided bearing ring can be manufactured at low cost.
Further, since the connection portion is provided axially outside the raceway surface of the bearing ring, the influence of the removal of the connection portion on the raceway surface on which the rolling element travels can be prevented.
Further, since the slit portions have the same shape in which circumferential end opposing in the circumferential direction can contact each other and are formed by one processing, the manufacturing cost of the split type outer ring can be further suppressed It can .

(A) is a figure which shows the connecting rod large end part to which the split type bearing ring of this embodiment is applied, (b) is a perspective view of a split type bearing ring. It is a perspective view which shows the manufacturing process of the split type bearing ring of this embodiment. It is a principal part side view of a split type bearing ring which shows the shape of other various slit parts. (A)-(d) is process explanatory drawing which shows the manufacturing method of the conventional split-type bearing ring.

Hereinafter, a method of manufacturing a split type bearing ring according to the present invention will be described in detail based on the drawings.
The split type bearing ring (split type outer ring) 10 of the present embodiment, as shown in FIG. 1A, is for connecting and supporting the crankpin 1 of the crankshaft and the large end of the connecting rod (connecting rod) 2. Is applied to a rolling bearing (needle bearing) 5 used for The connecting rod 2 has connecting rod divided pieces 2 a and 2 b divided in two in the circumferential direction (vertical direction) in the connecting rod divided parts 3 and 3.

The rolling bearing 5 includes a plurality of rolling elements (needles) 6 held by a split type cage 7 and an outer ring 10, and the rolling elements 6 are split from the outer circumferential surface of the crankpin 1 constituting the raceway surface. It rolls between the inner circumferential surface of the mold outer ring 10. As shown in FIG. 1 (b), the split-type outer ring 10 is a pair of outer ring split pieces (track ring split pieces) 10a formed in a substantially semi-cylindrical shape that is split in two in the circumferential direction at a location 180 ° apart , 10a.
The present embodiment relates to a method of manufacturing such a split-type outer ring.

  In the split-type outer ring 10 of the present embodiment, a drawing process is performed on a steel plate that is a normal plate-like material (for example, low carbon steel such as SPCC), and a bottom surface is punched out as shown in FIG. As shown in FIG. 1, a flanged cylinder 20 having a flange portion 21 at one end in the axial direction is formed.

  The drawing process is performed so that the radial thickness t of the flanged cylinder 20 after the drawing process is 5% to 20% thinner than the thickness of the steel plate. Generally, the plate thickness dimensional tolerance of the steel plate is relatively large, and it is difficult to satisfy the dimensional accuracy required by the split type outer ring 10 with the dimensional tolerance as it is. By ironing such that the plate thickness t1 is reduced by about 5% to 20%, the radial thickness t2 (inner and outer diameter dimension) of the flanged cylinder 20 is processed so as to have a desired dimensional tolerance.

  The reason why the working ratio of the steel plate is set to 5% to 20% is that if the working ratio is less than 5%, there is a possibility that the plate thickness dimension accuracy may be insufficient. Moreover, when the processing rate exceeds 20%, not only processing of the steel plate becomes difficult, but also there is a possibility that the steel plate may be work-hardened.

  The circumferential length L1 of the outer peripheral surface of the flanged cylinder 20 (cylindrical material 30 and slitted cylindrical material 40) formed in the drawing process is the value when the pair of outer ring split pieces 10a are combined in a cylindrical shape. A length (L1 = L + 2 × L2) obtained by adding a double length of the outer circumferential surface side circumferential width L2 of the slit portion 41 described later to the circumferential length L of the outer circumferential surface (see FIG. 1B) It has become.

  Next, as shown in FIG. 2B, the flanged cylinder 21 at the axial end is removed, and the flanged cylinder 20 is formed into a cylindrical material 30 in which the shapes of both axial ends 31 are arranged.

  Then, as shown in FIG. 2C, in the cylindrical material 30, the axially extending slit portions 41 are pierced at a single time in two places on the cylindrical surface 32 separated by 180 ° in the circumferential direction. It forms simultaneously and it becomes the cylindrical raw material 40 with a slit.

  The connecting portion 42 is left between the axial end 41 a of the slit 41 and the axial end 31 of the slitted cylindrical material 40 so that the slitted cylindrical material 40 is not separated by the slit 41. . The slit portion 41 shown in the figure is a groove having a substantially V-shape extending to the vicinity of both axial end portions 31 of the slitted cylindrical material 40 and having a linear shape at both ends. The shapes of the portions 43 and 44 are the same.

Then, the slit cylindrical material 40, two places of the connecting portion 42 that remains between the axial ends 31 of the axial end portion 41a and the slit cylindrical material 40 of the slit portion 41 is cut and removed, FIG. 2 ( As shown in d), a pair of outer ring split pieces 10a, 10a are formed.

  The pair of outer ring split pieces 10a and 10a from which the connecting portion 42 is removed can be combined in a cylindrical shape by the circumferential end portions 43 and 44 of the slit portion 41 being in contact with each other. The connection portion 42 is set axially outside of the raceway surface of the outer ring. Thus, the influence of the removal range of the connection portion 42 on the raceway surface of the outer ring is suppressed.

Next, as shown in FIG. 2 (e), the pair of outer ring split pieces 10a and 10a are subjected to hardening treatment such as hardening to obtain predetermined mechanical properties such as hardness required by the split outer ring 10. After that, the inner and outer peripheral surfaces and the axially opposite end portions 31 are polished and finished to a predetermined size, whereby the split type outer ring 10 is formed.

  In addition, the shape of the slit part 41 will not be specifically limited if it is the same shape so that circumferential direction edge parts 43 and 44 can contact | abut. For example, with respect to the straight groove 45 shown in FIG. 3 (a), the V-shaped groove 46 shown in FIG. 3 (b), the S-shaped curved groove 47 shown in FIG. 3 (c), and the axis shown in FIG. It can be of any shape, such as an inclined groove 48 that slopes.

As explained above, according to the manufacturing method of the split type bearing ring of the present embodiment, the step of drawing the steel plate which is a plate material to form the cylindrical material 30, and the circumferential direction of the cylindrical material 30 Forming a slit 41 extending in the axial direction to the vicinity of both axial ends 31 of the cylindrical material 30 at two places separated from each other, and between the axial end 31 of the cylindrical material 30 and the slit 41 And a step of cutting and removing the connecting portion 42 to form the pair of outer ring divided pieces 10a and 10a from the cylindrical raw material 30, so that the divided outer ring 10 with high accuracy can be manufactured at low cost. Further, the split-type outer ring 10 can be formed from a steel plate by drawing with high productivity, and the split-type outer ring 10 can be efficiently manufactured.
Further, since the connection portion 42 is axially outside the raceway surface of the outer ring 10, the influence of the removal of the connection portion on the raceway surface on which the rolling element travels can be prevented.
Furthermore, since the slit portions 41 have the same shape in which the circumferential end portions 43 and 44 opposed in the circumferential direction can contact each other and are formed by one processing, the manufacturing cost of the split-type outer ring 10 can be increased. It can be further suppressed.

  Further, since the drawing process forms the cylindrical material 30 from the steel plate by drawing 5% to 20% of the plate thickness t1 of the steel plate, the split-type outer ring with high accuracy without depending on the plate thickness dimension tolerance of the steel plate. 10 can be easily manufactured.

  Further, the pair of outer ring divided pieces 10a, 10a are formed in a cylindrical shape by bringing circumferential end portions 43, 44 of the slit portion 41 into contact with each other, and the drawing process is performed in the circumferential direction of the outer peripheral surface of the cylindrical material 30. The length L1 is obtained by adding twice the length of the circumferential width L2 of the outer circumferential surface side of the slit 41 to the circumferential length L of the outer circumferential surface of the pair of outer ring split pieces 10a and 10a combined in a cylindrical shape. Since the process is performed so as to have a length, a pair of outer ring material 50 having a predetermined size can be formed only by cutting and removing the connection portion 42 from the slitted cylindrical material 40 having the slit portion 41.

The present invention is not limited to the above-described embodiment, and appropriate modifications, improvements, and the like can be made.
For example, although the bearing ring is described as the outer ring in the above embodiment, the present invention is not limited to this, and the bearing ring may be the inner ring.
Further, the split type bearing ring of the present invention is applicable to a rolling bearing of a portion where assembly from the axial direction is difficult, and applicable to a portion rotatably supporting a camshaft, a balancer shaft or the like besides a crankshaft. It is.

10 split type outer ring (split type race ring)
DESCRIPTION OF SYMBOLS 10a Bearing ring divided piece 20 collared cylinder 30 Cylindrical material 31 Axial end 32 Cylindrical surface 40 Slitted cylindrical material 41 Slit part 42 Connecting part 43, 44 Circumferential end L The circumferential length L1 of the outer peripheral surface of the divided piece The circumferential length L2 of the outer peripheral surface of the cylindrical material The outer peripheral surface side circumferential width of the slit portion

Claims (3)

A method of manufacturing a split type bearing ring,
Drawing a plate-like material to form a cylindrical material;
Forming a slit portion extending in the axial direction to the vicinity of both axial end portions of the cylindrical material at two places separated in the circumferential direction of the cylindrical material;
Forming a pair of bearing ring split pieces from the cylindrical material by cutting and removing the connection between the axial end of the cylindrical material and the slit;
Equipped with
The connecting portion is provided axially outside the raceway surface of the bearing ring,
The method for manufacturing a split type bearing ring, wherein the slit portions have the same shape in which circumferential end portions opposed in the circumferential direction can be in contact with each other, and are formed by one processing.   The split type bearing ring according to claim 1, wherein the drawing process forms the cylindrical material from the plate material by dividing 5% to 20% of the thickness of the plate material. Production method. The pair of bearing ring split pieces are formed in a cylindrical shape by abutting circumferential end portions of the slit portion with each other,
In the drawing process, the circumferential length of the outer circumferential surface of the cylindrical material corresponds to the circumferential length of the outer circumferential surface of the pair of bearing ring split pieces combined in a cylindrical shape. The method for manufacturing a split type bearing ring according to claim 1 or 2, which is performed to have a length obtained by adding a length twice a direction width .

Images