JP2007224953A - Split-type rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it realize for rollers to be equally spaced along the circumference of a retainer and to increase the number of the rollers without giving rise to vibrations in a bearing operation, which are caused by unequally-spaced rolling bodies, thus reducing the vibrations in the bearing operation. <P>SOLUTION: In a split-type rolling bearing, a split position 12 of the retainer 10 is one where a pair of pockets 11 opposed to each other in a radial direction of the retainer 10 is axially decoupled in a circumferential end face 13. The roller held in each pocket 11 is equally spaced along the circumference of the retainer 10. In other word, a width P of a pole 14 of the retainer 10 is equal over the entire periphery to equally space the pockets 11 over the entire periphery. Due to equally spacing the pockets 11, the rollers are spaced at equal interval along the circumference of the retainer 10. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a split rolling bearing for rotatably supporting a crankshaft of an automobile engine, for example, in which a raceway and a cage of a rolling element are divided at least in the circumferential direction.

  In general, a sliding bearing is used as a bearing that rotatably supports a crankshaft and a camshaft of an internal combustion engine such as an automobile engine. However, in recent years, aggressive environmental technology has been pursued, and the use of rolling bearings is considered from the viewpoint of improving fuel consumption, reducing exhaust gas and noise, and the like. As a rolling bearing for supporting a crankshaft or the like of an automobile engine, a split type rolling bearing divided into two parts is mainly used because of restrictions on assembly.

Conventionally, split-type rolling bearings are known (see, for example, Patent Document 1).
11 is a cross-sectional view of a main part of the split cylindrical roller bearing disclosed in Patent Document 1, FIG. 12 is a perspective view showing an outer ring of the split cylindrical roller bearing of FIG. 11, and FIG. FIG. 14 is a perspective view showing a cage of the split cylindrical roller bearing of FIG. 11, and FIG. 14 is a perspective view showing a cage of the split cylindrical roller bearing of FIG.

  As shown in FIGS. 11 to 14, the split-type cylindrical roller bearing 100 includes an outer ring 101, an inner ring 102, and a cage 103 that are divided into two at predetermined positions in the circumferential direction. On the divided surfaces 104a, 104b, and 104c of the vessel 103, interposing materials 105a, 105b, and 105c having thicknesses equivalent to the respective cutting allowances are interposed. The round members 105a, 105b, 105c maintain the roundness of the outer ring 101, the inner ring 102, and the cage 103 that are divided into two parts, thereby eliminating waste during production.

  Here, in the case of a split-type rolling bearing such as the split-type cylindrical roller bearing 100 described above, vibration during bearing operation becomes a problem as compared with a sliding bearing. That is, in the split cylindrical roller bearing 100, increasing the number of cylindrical rollers 106 can reduce vibration, so it is desirable to increase the number of rollers.

  On the other hand, when the number of rollers is increased, the width of the pillar 103b between the pockets 103a for holding the cylindrical roller 106 so as to roll is reduced in the cage 103. Further, since the columns are in contact with each other at the divided portion, the pocket pitch is not constant, and therefore, the cylindrical rollers 106 are unevenly distributed in the circumferential direction, and the divided portion of the cage 103 passes through the load region when the bearing 100 is operated. There was a problem that vibrations occurred due to fluctuations in the load distribution at the time.

Further, Patent Document 2 describes a roller bearing split cage 110 used for a split type rolling bearing in which semicircular holding members 111 and 112 are arranged in an annular shape.
FIG. 15 is a cross-sectional view showing the roller bearing split cage disclosed in Patent Document 2. As shown in FIG.

  As shown in FIG. 15, the roller bearing split cage 110 is divided into a perfect annular retainer 110 along a diameter a passing through the center O into a pair of semi-annular retaining members 111 and 112. At the same time, the semi-annular holding members 111 and 112 are configured in an annular shape. The diameter R passes through the center in the circumferential direction of the upper column 113 of the two columns 113 and 114 facing each other in the diameter direction and the circumferential end surface of the lower column 114. Accordingly, the upper column portion 113 is divided at the center in the circumferential direction, and the lower column portion 114 is divided at the end surface in the circumferential direction.

  Even if such a roller bearing split cage 110 is used, like the above-described split cylindrical roller bearing 100 described in Patent Document 1, the rollers are unevenly distributed in the circumferential direction. There was a problem that vibration was generated due to fluctuations in the load distribution when the divided portion of the split cage 110 passed through the load region.

Therefore, conventionally, referring to FIG. 16 and FIG. 17, as disclosed in, for example, Patent Document 3, in the plate material N that forms the cage 121 of the roller bearing 120, the column Na at both ends (both sides of the divided portion) is formed. By making the width P / 2 narrower than the width P of the other column portion Nb, uneven distribution along the circumferential direction of the roller 122 is suppressed.
16 is an exploded perspective view of a main part showing the periphery of a cam shaft of a cylinder head to which the roller bearing disclosed in Patent Document 3 is applied, and FIG. 17 is a plate material forming a cage of the roller bearing of FIG. FIG.
Japanese Patent Laying-Open No. 2005-3166 (pages 3 to 4, FIGS. 1 to 4) Japanese Utility Model Publication No. 6-4431 (pages 8-9, FIG. 1) Japanese Patent Laying-Open No. 2005-180459 (pages 5 to 7, FIGS. 2 and 7)

  However, in the conventional roller bearing 120 shown in FIG. 16 and FIG. 17 described in Patent Document 3 described above, the width P / 2 of the column part Na on both sides of the divided part in the cage 121 is set to the width P of the other column part Nb. Even if it is narrower, there is a problem that the uneven distribution along the circumferential direction of the rollers 122 cannot be suppressed to a level that does not adversely affect the bearing performance. In addition, from the viewpoint of maintaining the strength of the cage 121, there is a limit in reducing the width of the column portion Na.

  The present invention can realize equal distribution of rolling elements along the circumferential direction of the cage, and increases the number of rolling elements without causing vibration during bearing operation due to uneven distribution of the rolling elements. It is an object of the present invention to provide a split type rolling bearing that can reduce vibration during bearing operation.

The above object of the present invention is achieved by the following configurations.
(1) In a split type rolling bearing in which an outer ring and a cage for rolling elements are divided at least in the circumferential direction and the shaft is rotatably supported.
An inner ring raceway of rolling elements formed on the outer peripheral surface of the shaft;
An outer ring formed with an outer ring raceway of rolling elements on the inner circumferential surface;
A cage disposed between the inner ring raceway and the outer ring raceway, each holding a plurality of rolling elements in a pocket portion so as to be able to roll, and having a column formed between the pockets having the same width.
The split type rolling bearing, wherein the cage is divided at a position where the pocket portion is divided in the circumferential direction, and the rolling elements are arranged at equal intervals along the circumferential direction of the cage.

  In the split type rolling bearing described in (1), the column widths between the pockets are all formed to be equal, and the split position of the cage is a position where the pair of pocket portions opposed to the radial direction of the cage are divided in the axial direction. Since the equal distribution of rolling elements along the circumferential direction of the cage is realized, the number of rolling elements can be increased without causing vibration during bearing operation due to uneven distribution of the rolling elements. Is done. Thereby, the vibration during the bearing operation is reduced.

  (2) The division position of the retainer is a position where the pair of pocket portions facing in the radial direction of the retainer is a position where the pair of pocket portions are divided in the axial direction at substantially the center in the circumferential direction. Split type rolling bearing.

In the split type rolling bearing described in (2) above, the split position of the cage is a position at which a pair of pocket portions opposed to the radial direction of the cage are divided in the axial direction at a substantially center in the circumferential direction. Since the rolling elements are evenly distributed along the circumferential direction, the number of rolling elements can be increased without causing vibration during bearing operation due to the uneven distribution of the rolling elements. Thereby, the vibration during the bearing operation is reduced.
Moreover, when the pocket portion is divided at the substantially central portion in the circumferential direction, the circumferential lengths of the rim portions of the cage to be divided become substantially equal. This makes it difficult for the rim portion to break and the strength of the cage is improved.

  (3) A fitting shape portion is provided on each of the circumferential end surfaces of the division portion of the cage, and the fitting shape portions facing each other at the division portions are each formed in a predetermined shape forming a pair. And the division | segmentation type rolling bearing of the said (1) or (2) description characterized by connecting corresponding division parts by being mutually fitted.

  In the split type rolling bearing described in the above (3), the fitting shape portions facing each of the divided portions of the cage are each formed in a predetermined shape forming a pair, and can be handled by being fitted to each other. Since the divided parts to be connected are connected to each other, it is difficult to cause misalignment or the like at the time of assembling the bearing, and good bearing assemblability is secured.

  (4) The fitting shape portions opposed to each of the divided portions of the cage are connected to each other to connect the corresponding divided portions so as not to be relatively displaceable in the axial direction. 3) The split-type rolling bearing described.

  In the split type rolling bearing described in (4), the fitting shape portions facing each of the split portions of the cage are connected to each other so that the corresponding split portions are connected so as not to be relatively displaceable in the axial direction. As a result, misalignment or the like hardly occurs at the time of bearing assembly, and good bearing assemblability is ensured.

  (5) One of the fitting shape portions protrudes in a triangular shape, and the other of the fitting shape portions is formed in an inverted triangle shape corresponding to the one triangle shape. The split type rolling bearing described.

  In the split type rolling bearing described in (5), one of the fitting shape portions facing each of the split portions of the cage protrudes in a triangular shape, and the other is an inverted triangular shape corresponding to the one triangular shape. Since the corresponding divided portions are connected to each other so as not to be relatively displaceable in the axial direction by being fitted to each other, misalignment or the like hardly occurs at the time of bearing assembly, and good bearing assemblability is ensured. .

  (6) The fitting shape portions facing each of the divided portions of the cage are connected to each other, thereby connecting the corresponding divided portions to each other so as not to be relatively displaceable in the circumferential direction and the axial direction. The split type rolling bearing according to (3) above.

  In the split type rolling bearing described in (6) above, the fitting shape portions facing each of the split portions of the cage are fitted to each other so that the corresponding split portions are relative to each other in the circumferential direction and the axial direction. Since they are connected so that they cannot be displaced, it is difficult to cause misalignment or the like during the assembly of the bearing, and good bearing assembly is ensured.

  (7) One of the fitting shape portions protrudes in a hook shape, and the other of the fitting shape portions is formed in a hook shape interlocked with one of the hook shapes. (6) The split type rolling bearing according to (6).

  In the split type rolling bearing described in (7) above, one of the fitting shape portions facing each of the split portions of the cage is protruded in a hook shape, and the other is mutually locked with the hook shape. Since it is formed in a hook shape and is fitted to each other, the corresponding divided parts are connected to each other so as not to be relatively displaceable in the circumferential direction and the axial direction. Bearing assemblability is ensured.

  (8) The fitting shape portions facing each of the divided portions of the cage have a predetermined tightening allowance in a mutually fitted state, and connect and fix the corresponding divided portions. The split type rolling bearing according to (3) above.

  In the split type rolling bearing described in (8), the fitting shape portions facing each of the split portions of the cage have a predetermined tightening allowance in a state of being fitted to each other, and the corresponding split portions are As the bearings are connected and fixed, good bearing assemblability is ensured without causing misalignment or the like at the time of bearing assembly, and vibration and noise due to collision between the divided portions during bearing operation are prevented.

  (9) One of the fitting shape portions is formed in a cylindrical convex shape, and the other fitting shape portion is formed in a cylindrical concave shape corresponding to the one cylindrical convex shape. The split type rolling bearing according to (8), wherein one of the shapes is fitted into the other of the cylindrical concave shapes of the fitting shape portion by press-fitting.

  In the split type rolling bearing according to (9), one of the fitting shape portions facing each split portion of the cage is formed in a cylindrical convex shape, and the other is a cylindrical concave shape corresponding to the one cylindrical convex shape. Are formed with a predetermined tightening allowance when they are fitted to each other by press-fitting, and the corresponding divided parts are connected and fixed, so that there is no misalignment at the time of assembling the bearing. Performance is ensured, and vibration and noise due to collision between the divided parts during the bearing operation are prevented.

According to the split type rolling bearing of the present invention, it is possible to realize equal distribution of the rollers along the circumferential direction of the cage, without causing vibration during bearing operation due to uneven distribution of the rollers. The number of moving bodies can be increased, thereby reducing vibration during bearing operation.
The split type rolling bearing obtained by the present invention is suitably used for supporting a crankshaft of an automobile engine when low vibration, high load resistance and high durability are required.

Hereinafter, the present invention will be described with reference to illustrated embodiments.
FIG. 1 is a plan view of an essential part showing a cage of a split type rolling bearing according to a first embodiment of the present invention, where (a) shows a state at the time of assembly, and (b) shows a state before the assembly. Each is shown. FIG. 2 is an exploded perspective view of the cage of FIG.

  In the split roller bearing of the first embodiment (not shown), the outer ring and the cage 10 (see FIGS. 1 and 2) are equally divided into two in the circumferential direction, and a crankshaft (not shown) of an automobile engine is used. A crankshaft is rotatably supported as a bearing to be supported. That is, the split roller bearing is disposed between the inner ring raceway of the roller formed on the outer peripheral surface of the crankshaft, the outer ring formed with the outer ring raceway of the roller on the inner peripheral surface, the inner ring raceway and the outer ring raceway, A plurality of rollers arranged in the circumferential direction are each constituted by a cage 10 that holds the rollers in the pocket portion 11 so as to be able to roll.

  Referring to FIGS. 1 and 2, the cage 10 is made of metal or resin. The division position 12 of the cage 10 is a position at which a pair of pocket portions 11 facing in the radial direction of the cage 10 is divided along the axial direction by a circumferential end surface 13, and is held by each pocket portion 11. The rollers are arranged at equal intervals along the circumferential direction of the cage 10.

  In other words, the width P of the column portion 14 of the cage 10 is uniform over the entire circumference, and the pocket portions 11 are arranged at equal intervals over the entire circumference. Due to the equidistant arrangement of the pocket portions 11, the rollers are arranged at regular intervals along the circumferential direction of the cage 10. Therefore, the number of rollers can be increased without causing vibration during bearing operation due to uneven roller distribution, and vibration during bearing operation is reduced.

  FIGS. 3A and 3B are main part plan views showing the cage of the split rolling bearing according to the second embodiment of the present invention, wherein FIG. 3A shows a state at the time of assembly, and FIG. 3B shows a state before the assembly. Each is shown. 4 is an exploded perspective view of the cage of FIG.

Referring to FIGS. 3 and 4, in the split type rolling bearing of the second embodiment, the split position 22 of the cage 20 has a pair of pocket portions 21 that are opposed to the radial direction of the cage 20 at a substantially central position in the circumferential direction. It is a position to divide along the axial direction. When the pocket portion 21 is divided at substantially the center in the circumferential direction, the circumferential length of the divided rim portion 23 becomes substantially equal on the left and right in FIG. As a result, the rim portion 23 is hardly broken and the strength of the cage 20 is improved.
Other configurations and operations are the same as those in the first embodiment.

  FIGS. 5A and 5B are main part plan views showing a cage of a split rolling bearing according to a third embodiment of the present invention, wherein FIG. 5A shows a state at the time of assembly, and FIG. 5B shows a state before the assembly. Each is shown. 6 is an exploded perspective view of the cage of FIG. 5, and FIG. 7 is a schematic enlarged view of the main part of the cage of FIG.

Referring to FIGS. 5 to 7, in the split type rolling bearing of the third embodiment, a fitting shape portion 32 is provided on each circumferential end surface of the split portion 31 of the cage 30. As for the fitting shape part 32 which opposes in each division | segmentation part 31, one 32a (upper side in FIG. 7) protrudes in a triangle shape, and the other 32b (lower side in FIG. 7) has a triangular shape of one 32a. It forms in the shape of a corresponding inverted triangle, and when it mutually fits, the corresponding division parts 31 are connected so that relative displacement is impossible in an axial direction. As a result, misalignment or the like hardly occurs at the time of assembling the bearing, and good bearing assemblability is ensured.
Other configurations and operations are the same as those in the first embodiment.

  FIG. 8 is a schematic enlarged view of a main part showing a cage of a split type rolling bearing according to a fourth embodiment of the present invention.

Referring to FIG. 8, in the divided type rolling bearing of the fourth embodiment, one of the fitting shape portions 42 facing each divided portion 41 of the cage 40 protrudes in a hook shape. And the other 42b (upper side in FIG. 8) is formed in a hook shape that is mutually locked with the hook shape of the one 42a. Are connected in the circumferential direction and the axial direction so as not to be relatively displaceable. As a result, misalignment or the like hardly occurs at the time of assembling the bearing, and good bearing assemblability is ensured.
Other configurations and operations are the same as those in the first embodiment.

  FIG. 9 is an exploded perspective view showing the cage of the split rolling bearing according to the fifth embodiment of the present invention, and FIG. 10 is a schematic enlarged view of the main part of the cage of FIG.

Referring to FIGS. 9 and 10, in the split type rolling bearing of the fifth embodiment, one of the fitting shape portions 52 facing each split portion 51 of the cage 50 is a cylinder 52a (lower side in FIG. 10). It is formed in a convex shape, and the other 52b (upper side in FIG. 10) is formed in a cylindrical concave shape corresponding to the cylindrical convex shape of the one 52a. And having the corresponding divided parts 51 connected and fixed. As a result, good bearing assemblability is ensured without causing misalignment or the like at the time of assembling the bearing, and vibration and noise due to collision between the divided portions 51 during bearing operation are prevented.
Other configurations and operations are the same as those in the first embodiment.

  As described above, according to the above embodiments, the division positions 12, 22, 31, 41, 51 of the cages 10, 20, 30, 40, 50 are the diameters of the cages 10, 20, 30, 40, 50. The pair of pocket portions 11 and 21 facing each other in a direction are axially divided, and the rollers held by the pocket portions 11 and 21 are arranged in the circumferential direction of the cages 10, 20, 30, 40, and 50. Are equally spaced along.

  Therefore, it is possible to realize the equal distribution of the rollers along the circumferential direction of the cages 10, 20, 30, 40, 50, and without causing the vibration during the bearing operation due to the uneven distribution of the rollers. You can increase the number. As a result, vibration during bearing operation can be reduced, and particularly for supporting the crankshaft of an automobile engine, low vibration, high load resistance, and high durability can be realized without causing any restrictions on assembly. it can.

  Further, according to the second embodiment, since the pocket portion 21 is divided at substantially the center in the circumferential direction, the circumferential length of the divided rim portion 23 is made substantially equal on the left and right in FIG. Can do. Thereby, breakage of the rim portion 23 can be made difficult to occur, and the strength of the cage 20 can be improved.

  According to the third and fourth embodiments, the end faces in the circumferential direction of the divided portions 31 and 41 of the cages 30 and 40 are respectively fitted with triangular fitting shapes 32 and inverted triangular shapes (third embodiment), Or the hook-shaped fitting shape part 42 (4th Embodiment) is provided, and when the fitting shape parts 32 and 42 which oppose in each division part 31 and 41 are mutually fitted, corresponding division | segmentation is carried out. The parts 31 and 41 are connected to each other such that they cannot be displaced relative to each other in the axial direction (third embodiment), or cannot be relatively displaced in the circumferential direction and the axial direction (fourth embodiment). Thereby, favorable bearing assemblability can be ensured without causing misalignment or the like during the assembly of the bearing.

  According to the fifth embodiment, each of the circumferential end surfaces of the split portions 51 of the cage 50 is provided with a cylindrical convex shape and a cylindrical concave fitting shape portion 52, and the fittings facing each of the split portions 51. In a state where the shaped portions 52 are fitted to each other by press-fitting, they have a predetermined allowance, and the corresponding divided portions 51 are connected and fixed. As a result, it is possible to ensure good bearing assemblability without causing misalignment or the like during the assembly of the bearing, and it is possible to prevent vibration and noise due to collision between the divided portions during the bearing operation.

It is a principal part top view which shows the holder | retainer of the split type rolling bearing which is 1st Embodiment of this invention. It is a disassembled perspective view of the holder | retainer of FIG. It is a principal part top view which shows the holder | retainer of the split type rolling bearing which is 2nd Embodiment of this invention. It is a disassembled perspective view of the holder | retainer of FIG. It is a principal part top view which shows the holder | retainer of the split type rolling bearing which is 3rd Embodiment of this invention. It is a disassembled perspective view of the holder | retainer of FIG. FIG. 6 is a schematic enlarged view of a main part of the cage in FIG. 5. It is a schematic principal part enlarged view which shows the holder | retainer of the split-type rolling bearing which is 4th Embodiment of this invention. It is a disassembled perspective view which shows the holder | retainer of the split type rolling bearing which is 5th Embodiment of this invention. It is a schematic principal part enlarged view of the holder | retainer of FIG. FIG. 3 is a cross-sectional view of a main part showing a split cylindrical roller bearing disclosed in Patent Document 1. It is a perspective view which shows the outer ring | wheel of the split-type cylindrical roller bearing of FIG. It is a perspective view which shows the inner ring | wheel of the split-type cylindrical roller bearing of FIG. It is a perspective view which shows the holder | retainer of the split-type cylindrical roller bearing of FIG. It is sectional drawing which shows the split cage for roller bearings currently disclosed by patent document 2. FIG. It is a principal part disassembled perspective view which shows the surroundings of the cam shaft of the cylinder head to which the roller bearing currently disclosed by patent document 3 is applied. It is a top view which shows the board | plate material which forms the holder | retainer of the roller bearing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Cage 11 Pocket part 12 Dividing position 13 Circumferential end face 14 Column part 20 Cage 21 Pocket part 22 Dividing position 23 Rim part 30 Cage 31 Dividing part 32 Fitting shape part 32a One of fitting shape parts 32b Fitting The other of the shape part 40 The cage 41 The divided part 42 The fitting shape part 42a One of the fitting shape part 42b The other of the fitting shape part 50 The cage 51 The dividing part 52 The fitting shape part 52a The one of the fitting shape part 52b The fitting The other side of the shape part P Column width

Claims (9)

In the split type rolling bearing in which the outer ring and the cage of the rolling element are divided at least in the circumferential direction and the shaft is rotatably supported.
An inner ring raceway of rolling elements formed on the outer peripheral surface of the shaft;
An outer ring formed with an outer ring raceway of rolling elements on the inner circumferential surface;
A cage disposed between the inner ring raceway and the outer ring raceway, each holding a plurality of rolling elements in a pocket portion so as to be able to roll, and having a column formed between the pockets having the same width.
The split type rolling bearing, wherein the cage is divided at a position where the pocket portion is divided in the circumferential direction, and the rolling elements are arranged at equal intervals along the circumferential direction of the cage.   2. The split type rolling bearing according to claim 1, wherein the division position of the cage is a position where the pocket portion of the cage is divided at a substantially central portion in the circumferential direction.   Each of the circumferential end surfaces of the divided portions of the cage is provided with a fitting shape portion, and the fitting shape portions facing each other in the divided portions are each formed in a predetermined shape forming a pair, The split type rolling bearing according to claim 1, wherein the divided parts are connected to each other by being fitted to each other.   The fitting shape part which opposes in each division part of the said holder | retainer connects the corresponding division parts so that relative displacement is impossible in an axial direction by being mutually fitted. Split type rolling bearing.   5. The split mold according to claim 4, wherein one of the fitting shape portions protrudes in a triangular shape, and the other of the fitting shape portions is formed in an inverted triangle shape corresponding to the one triangle shape. Rolling bearing.   The fitting shape portions facing each of the divided portions of the cage are connected to each other so as to connect the corresponding divided portions so as not to be relatively displaceable in the circumferential direction and the axial direction. Item 4. The split type rolling bearing according to Item 3.   7. One of the fitting shape portions protrudes in a hook shape, and the other of the fitting shape portions is formed in a hook shape interlocked with one of the hook shapes. Split type rolling bearing.   The fitting shape portions facing each of the divided portions of the cage have a predetermined tightening allowance in a state of being fitted to each other, and connect and fix the corresponding divided portions to each other. Item 4. The split type rolling bearing according to Item 3.   One of the fitting shape portions is formed in a cylindrical convex shape, and the other of the fitting shape portions is formed in a cylindrical concave shape corresponding to one cylindrical convex shape, and one of the cylindrical convex shapes of the fitting shape portions 9. The split type rolling bearing according to claim 8, wherein the split type rolling bearing is fitted to the other cylindrical concave shape of the fitting shape portion by press-fitting.

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