JP2012225426A - Split type rolling bearing, and split type rolling bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a split type rolling bearing and a split type rolling bearing device, which can suppress generation of noise or vibration without complication of manufacturing or assembling and which can smoothly act.SOLUTION: A split type rolling bearing 5 includes: an outer ring composed of an inside outer ring 10 disposed radially inside and an outside outer ring 20 disposed radially outside the inside outer ring 10; and a plurality of rolling elements 6 rotatably held radially inside the outer ring. The inside outer ring 10 is split at two or more inside splitting sections 11 provided in a circumferential direction, and the outside outer ring 20 is split at two or more outside splitting sections 21 provided in a circumferential direction. The inside split sections 11 and the outside split sections 21 are disposed not to overlap with each other in a radial direction.

Description

  The present invention relates to a split type rolling bearing and a split type rolling bearing device.

  In general, a crankshaft used in a reciprocating engine such as an automobile is integrally formed by casting or forging, and it is difficult to insert the integral bearing from the axial direction. Used. Conventionally, a slide bearing has been often used as a split-type bearing, but in recent years, a rolling bearing having a smaller rotational torque at the time of rotation and a higher energy saving effect than a plain bearing has been applied (for example, see Patent Documents 1 to 4). ).

JP 2003-214442 A JP 2006-258138 A JP 2007-139153 A JP 2009-014078 A

  In the above-mentioned split type rolling bearing, when an error occurs in the assembly of the divided housing case, a positional deviation of about several μm may occur on the raceway surface of the bearing on which the rolling element rolls. There is a problem that the split type rolling bearing cannot operate smoothly due to the occurrence of vibration and vibration. This becomes a problem particularly when the position of the divided part of the housing case matches the position of the divided part of the outer ring. Therefore, conventionally, it has been proposed that the split part of the housing case and the split part of the outer ring are shifted from each other by using a split type rolling bearing in which the outer ring is split into two at a position slightly shifted from 180 degrees. . However, such a split type rolling bearing is difficult to manufacture and assemble, and there is a possibility that noise and vibration cannot be suppressed if the amount of shifting is not sufficient.

  In addition, in order to suppress noise and vibration, it has been conventionally proposed to reduce the bearing load by providing an inclined portion (sloping portion) in the split portion of the outer ring. However, if the slack portion is large, load loss occurs, and the motion of the rolling element may be disturbed. In addition, the rolling element collides with the slack portion of the outer ring due to centrifugal force, and the effect of suppressing noise and vibration is insufficient.

  The present invention has been made in view of the above circumstances, and provides a split-type rolling bearing and a split-type rolling bearing device that can suppress the generation of noise and vibration without complicating manufacture and assembly and that can operate smoothly. For the purpose.

The above object of the present invention can be achieved by the following constitution.
(1) A split-type rolling bearing comprising an outer ring and a plurality of rolling elements that are rotatably held on the radially inner side of the outer ring, wherein the outer ring is divided into two or more in the circumferential direction,
The outer ring includes an inner outer ring arranged radially inside and an outer outer ring arranged radially outside, and the inner outer ring is divided at an inner divided portion provided in two or more circumferential directions, The outer ring is divided at the outer divided portion provided in the circumferential direction by two or more,
A split type rolling bearing, wherein the inner split portion and the outer split portion are arranged so as not to overlap in a radial direction.
(2) The split type rolling bearing according to (1), which is used to support a crankshaft of a reciprocating engine,
The inner outer ring is divided into two at the two inner divided portions provided at positions separated by about 180 ° in the circumferential direction,
The split rolling bearing according to (1) above, wherein the two inner divided portions are arranged with a phase shift of about 90 degrees with respect to the direction of movement of the piston of the reciprocating engine.
(3) A split type rolling bearing device comprising: the split type rolling bearing according to (1) or (2) above; and a housing disposed on a radially outer side of the split type rolling bearing,
The housing is divided at two or more housing divisions provided in the circumferential direction.
The split type rolling bearing device, wherein the housing split portion and the outer split portion are arranged so as not to overlap in the radial direction.

  ADVANTAGE OF THE INVENTION According to this invention, generation | occurrence | production of a noise and a vibration can be suppressed, without complicating manufacture or an assembly, and the split-type rolling bearing and split-type rolling bearing apparatus which can operate | move smoothly can be provided.

It is a figure for demonstrating the assembly of the split type rolling bearing of this embodiment. It is sectional drawing which shows the split type rolling bearing of this embodiment.

  Hereinafter, an embodiment of a split type rolling bearing according to the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1 and 2, the split type rolling bearing 5 according to the present embodiment is for supporting the crankshaft 1 of the reciprocating engine, and the housing case 2 and the split type rolling bearing 5 are cranked. The shaft 1 is assembled from the outside in the radial direction. The split type rolling bearing 5 includes a plurality of rolling elements 6 that are held by a cage (not shown), an inner outer ring 10, and an outer outer ring 20. The rolling element 6 rolls directly on the outer peripheral surface of the crankshaft 1 and also rolls on the inner peripheral surface of the inner outer ring 10. The housing case 2 includes housing divided pieces 2a and 2b that are divided into two in the circumferential direction (vertical direction) in the housing divided portions 3 and 3. Both end surfaces in the circumferential direction of the housing divided piece 2a are formed as divided surfaces 3a and 3a, and are combined with the divided surfaces 3b and 3b on both end surfaces in the circumferential direction of the housing divided piece 2b to form the housing case 2.

  The inner outer ring 10 includes a pair of inner divided pieces 10a and 10b that are divided into two in the circumferential direction by two inner divided portions 11 and 11 that are located at positions separated by about 180 ° in the circumferential direction, and form a semi-cylindrical shape. The outer outer ring 20 has a pair of outer divided pieces 20a and 20b that are divided into two in the circumferential direction by two outer divided portions 21 and 21 that are located at positions spaced apart from each other by about 180 ° in the circumferential direction. Both end surfaces in the circumferential direction of the inner divided piece 10a are formed as divided surfaces 11a and 11a, and are combined with the divided surfaces 11b and 11b on the both end surfaces in the circumferential direction of the inner divided piece 10b to form the inner outer ring 10. Similarly, both end surfaces in the circumferential direction of the outer divided piece 20a are formed as divided surfaces 21a and 21a, and are combined with the divided surfaces 21b and 21b on both end surfaces in the circumferential direction of the outer divided piece 20b to form the outer outer ring 20. To do.

  The pair of inner divided pieces 10a, 10b and the pair of outer divided pieces 20a, 20b can be easily manufactured by naturally dividing or machining the solid inner (cut-out) inner outer ring 10 and outer outer ring 20. Can do. Or a pair of inner side division piece 10a, 10b and a pair of outer side division piece 20a, 20b may be manufactured by press work, and may combine these. The inner outer ring 10 (the pair of inner divided pieces 10a and 10b) is manufactured from a material having a sufficient rolling life as a bearing. The outer outer ring 20 (the pair of outer divided pieces 20a and 20b) is manufactured from a material having sufficient strength, such as a metal material or a resin material. The inner outer rings 10a and 10b and the outer outer rings 20a and 20b have relative rotation (slip) between the housing cases 2a and 2b and the outer outer ring 20, and relative rotation between the outer outer ring 20 and the inner outer ring 10. In order to prevent (slip), protrusions and notches can be provided.

  When the split type rolling bearing 5 is disposed on the crankshaft 1 of the reciprocating engine, a load is applied to the split type rolling bearing 5 in the movement direction of the piston of the reciprocating engine. In order to support this load, the inner divided pieces 10a and 10b are arranged so that the divided surfaces 11a and 11b are orthogonal to the direction of movement of the piston, that is, the crankshaft 1 is sandwiched from above and below.

  When the split type rolling bearing 5 is assembled, as described above, the inner divided pieces 10a and 10b are arranged above and below the crankshaft 1, and then the outer divided pieces 20a and 20b are combined from the left and right. Thereby, the inner divided pieces 10a and 10b are press-fitted while being guided inward in the radial direction of the outer divided pieces 20a and 20b to form the inner outer ring 10, and the outer divided pieces 20a and 20b form the outer outer ring 20. . As described above, since the inner outer ring 10 is pressed from the outer side in the radial direction by the outer outer ring 20, the step generated on the inner peripheral surface of the inner outer ring 10 in the inner divided portions 11 and 11 can be minimized, and the impact load can be reduced. And noise and vibration can be reduced.

  After the inner divided pieces 10a and 10b and the outer divided pieces 20a and 20b are combined to form the inner outer ring 10 and the outer outer ring 20, the housing divided pieces 2a and 2b are combined from above and below on the radially outer side of the outer outer ring 20. . Thus, since the housing divided pieces 2 a and 2 b are combined from both the upper and lower sides of the crankshaft 1, the housing divided portions 3 and 3 are positioned on the left and right sides of the crankshaft 1. On the other hand, since the outer divided pieces 20a and 20b adjacent to the radially inner side of the housing case 2 are combined from the left and right sides of the crankshaft 1 as described above, the outer divided portions 21 and 21 are positioned above and below the crankshaft 1. And the phase is shifted by 90 ° from the housing dividing portions 3 and 3. As described above, the outer divided portions 21 and 21 and the housing divided portions 3 and 3 do not overlap with each other in the radial direction, and are greatly shifted from each other. Even so, it is possible to reduce the occurrence of impact load, noise, and vibration without the positional deviation affecting the split-type rolling bearing 5. Further, the inner outer ring 10 and the outer outer ring 20 are both divided into halves at positions spaced apart by 180 °, and assembly is easy.

  Thus, according to the split type rolling bearing 5 of the present embodiment, by using the inner outer ring 10 and the outer outer ring 20, the inner divided part 11, without being affected by errors generated in the assembly of the housing case 2, 11, the step generated on the inner peripheral surface of the inner outer ring 10 can be minimized. Therefore, according to the present embodiment, it is possible to provide a split type rolling bearing and a split type rolling bearing device that can suppress the generation of impact load, noise, and vibration without complicating manufacture and assembly and that can operate smoothly. Can do.

  In addition, this invention is not limited to embodiment mentioned above, A change, improvement, etc. are possible suitably. For example, the deviation of the outer divided portions 21 and 21 with respect to the housing divided portions 3 and 3 may not be 90 ° but may be an arbitrary angle.

  The split type rolling bearing and the split type rolling bearing device according to the present invention include a crankpin part connected to a crankshaft support part and a large end part of a conrad in addition to an automotive reciprocating engine, an industrial or marine reciprocating engine. Alternatively, it can be suitably used for all applications in which split bearings are used, such as camshafts and balancer shaft support parts.

DESCRIPTION OF SYMBOLS 1 Crankshaft 2 Housing case 5 Split type rolling bearing 10 Inner outer ring 11 Inner divided part 20 Outer outer ring 21 Outer divided part

Claims (3)

A split-type rolling bearing comprising an outer ring and a plurality of rolling elements that are rotatably held on the radially inner side of the outer ring, wherein the outer ring is divided into two or more in the circumferential direction;
The outer ring includes an inner outer ring arranged radially inside and an outer outer ring arranged radially outside, and the inner outer ring is divided at an inner divided portion provided in two or more circumferential directions, The outer ring is divided at the outer divided portion provided in the circumferential direction by two or more,
A split type rolling bearing, wherein the inner split portion and the outer split portion are arranged so as not to overlap in a radial direction. The split type rolling bearing according to claim 1, which is used to support a crankshaft of a reciprocating engine,
The inner outer ring is divided into two at the two inner divided portions provided at positions separated by about 180 ° in the circumferential direction,
2. The split type rolling bearing according to claim 1, wherein the two inner divided portions are arranged with a phase shift of about 90 degrees with respect to a moving direction of a piston of the reciprocating engine. A split type rolling bearing device comprising: the split type rolling bearing according to claim 1; and a housing disposed on a radially outer side of the split type rolling bearing,
The housing is divided at two or more housing divisions provided in the circumferential direction.
The split type rolling bearing device, wherein the housing split portion and the outer split portion are arranged so as not to overlap in the radial direction.

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