JP5668877B2 - Bi-splitting rolling bearing and bearing device having the same - Google Patents

Description

  The present invention relates to a split bearing and a bearing device including the same.

  In engines such as automobiles and ships, the support bearing that supports the crankshaft that converts the reciprocating motion of the piston into rotational motion is arranged between the counterweights or between the counterweight and the connecting rod large end, A split bearing divided in two in the direction is used.

  Conventionally, a sliding bearing having a large rotational loss is used as the support bearing. However, in recent years, the demand for an engine with less fuel consumption has been increasing, so in order to reduce the rotation loss, it has been proposed to use a rolling bearing divided into two in the circumferential direction instead of the sliding bearing. (For example, refer to Patent Document 1).

  This split type rolling bearing includes, for example, an outer ring divided in two in the circumferential direction, a plurality of rolling elements that roll on the inner raceway surface of both outer rings, and each rolling element substantially in the circumferential direction. And a retainer for holding at intervals. The journal portion of the crankshaft is fitted into the rolling bearing as an inner ring member. The retainer is guided in rotation by the outer peripheral surface thereof being in sliding contact with the inner peripheral surface of the outer ring. Further, the rolling bearing is configured such that lubricating oil is supplied into the bearing from an oil supply hole formed in the outer ring so as to penetrate in the radial direction.

JP 2006-234074 A

In the above rolling bearing, in order to suppress an increase in bearing torque due to the lubricating oil supplied to the inside of the bearing, the supply amount of the lubricating oil tends to be greatly reduced. However, in this case, when the crankshaft is rotated at a high speed, the lubricating oil supplied from the oil supply hole is pushed back radially outward along the oil supply hole due to the centrifugal force associated with the rotation of the cage, and sufficiently enters the bearing. May not be introduced. In this case, the bearing temperature rapidly increases due to insufficient lubrication, and the bearing tends to be seized, which may cause a problem that the durability of the split roller bearing is lowered.
The present invention has been made in view of the above problems, and includes a two-rolling bearing capable of suppressing a decrease in the durability of the bearing even when the amount of lubricating oil supplied is small, and the same. An object is to provide a bearing device.

In order to achieve the above object, the split bearing according to the present invention has a lubrication hole that penetrates in the radial direction, a plurality of outer rings that are split in the circumferential direction, and a plurality of rollers that roll on the inner raceway surface of the outer ring. Each of the rolling elements, and a cage that is divided at at least one location on the circumference and holds the rolling elements at a predetermined interval along the circumferential direction. The split roller bearing for guiding the rotation of the cage, wherein the cage is gradually inclined in the reverse direction with respect to the rotation direction of the cage from the radially outer side toward the radially inner side, An inclined surface is formed in which the lubricating oil supplied from the hole is scraped inward in the radial direction by rotation of the cage, and the inclined surface corresponds to the oil supply hole in the column portion between the pockets of the cage. It has been formed in a portion to It is characterized in.

According to this configuration, the lubricating oil supplied from the oil supply hole of the outer ring is held by the inclined surface of the cage that gradually inclines in the opposite direction to the rotation direction of the cage as it goes from the radially outer side to the radially inner side. By rotating the device, it can be squeezed radially inward and guided into the bearing. Thereby, even if the supply amount of the lubricating oil is small, it is possible to suppress seizure of the bearing due to insufficient lubrication, and therefore it is possible to improve the durability of the double split bearing.
Further, since the inclined surface is formed in a portion corresponding to the oil supply hole in the column portion between the pockets of the cage, the oil supply hole of the outer ring is formed by the inclined surface formed in the column portion of the cage. Lubricating oil supplied from can be scraped inward in the radial direction by rotation of the cage and guided into the bearing. Thereby, even if the supply amount of the lubricating oil is small, it is possible to suppress seizure of the bearing due to insufficient lubrication, and therefore it is possible to improve the durability of the double split bearing .

  Moreover, it is preferable that the said inclined surface is formed in at least one partial cross section of the circumferential direction both partial cross section of the said holder | retainer. According to this structure, it can suppress that the intensity | strength of a holder | retainer falls resulting from forming an inclined surface.

  Moreover, it is preferable that the said inclined surface is formed over the axial direction full length of the said dividing surface. According to this configuration, the lubricating oil can be scraped efficiently by the inclined surface.

The bearing device of the present invention is characterized by comprising the above-mentioned two-rolling bearing and a housing having a support hole for closely supporting the two-rolling bearing.
In the bearing device of the present invention, since the above-described split roller bearing is used, it is possible to suppress the occurrence of seizure in the bearing due to insufficient lubrication inside the bearing even if the amount of lubricating oil supplied is small. Thereby, the durability of the bearing device can be improved.

  According to the present invention, even if the supply amount of the lubricating oil is small, it is possible to suppress the seizure of the bearing due to insufficient lubrication, and therefore it is possible to improve the durability of the double split bearing.

It is sectional drawing which shows the two-part rolling bearing which concerns on the reference form of this invention, and a bearing apparatus using the same. It is AA sectional drawing of FIG. It is a principal part enlarged view of FIG. It is a sectional view showing a split rolling bearing and the bearing device using the same according to an embodiment of the present invention. It is BB sectional drawing of FIG. It is a principal part enlarged view of FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a bi-rolling bearing and a bearing device using the same according to the present invention will be described below in detail with reference to the drawings.
FIG. 1 shows that in the present invention , the cage gradually inclines in the opposite direction with respect to the rotation direction of the cage as it goes from the radially outer side to the radially inner side, and the lubricating oil supplied from the oil supply hole It is sectional drawing which shows the double split bearing which concerns on the reference form for demonstrating the structure and effect | action in which the inclined surface which rakes in radial direction by rotation is formed, and a bearing apparatus using the same. This bearing device is a bearing device for supporting a crankshaft, and includes a housing 21 that is a part of the crankshaft support portion 20. The housing 21 includes an upper block 22 and a lower block 23, and a support hole 24 is formed by the lower surface of the upper block 22 and the upper surface of the lower block 23. The upper block 22 and the lower block 23 are integrated by a pair of fixing bolts 25. In the upper block 22, a supply passage 26 for supplying lubricating oil to the double split bearing 1 is formed so as to penetrate from the upper surface 22 a of the upper block 22 toward the support hole 24.

  In the support hole 24 of the housing 21, the outer ring 2 of the two-rolled bearing 1 according to one embodiment of the present invention is closely fitted. The two-way split bearing 1 includes the outer ring 2 divided into two in the circumferential direction, a plurality of rolling elements 3 that roll on the inner raceway surface 11 of the outer ring 2, and two locations on the circumference. And the retainer 4 divided by. A shaft 5 that is a journal portion of the crankshaft is rotatably supported by the rolling bearing 1 by being fitted in a portion surrounded by the plurality of rollers 3 of the split roller bearing 1. The shaft 5 also functions as an inner ring member of the split split bearing 1.

  The outer ring 2 includes two half outer rings 2a and 2b formed in a semi-cylindrical shape, and includes a circumferential end face of the half outer ring 2a and a circumferential end face of the half outer ring 2b facing the end face. Thus, the mating surface 6 is configured.

  2 is a cross-sectional view taken along the line AA in FIG. On the inner peripheral surfaces of the half outer rings 2a and 2b, the raceway surface 11 on which the roller 3 rolls in the axial center portion, and a pair of flanges projecting radially inward on both axial sides of the raceway surface 11 12 are integrally formed. In the axially intermediate portion of the half outer ring 2a, in order to supply the lubricating oil supplied to the supply passage 26 to the inside of the bearing, the outer peripheral surface of the half outer ring 2a is directed toward the raceway surface 11 which is the inner peripheral surface. An oil supply hole 13 penetrating in the radial direction is formed. The oil supply hole 13 may be formed in the half outer ring 2 b or the mating surface 6.

  In FIG. 1, the cage 4 holds the rollers 3 at substantially equal intervals in the circumferential direction, and is composed of a pair of semicircular halves 4a and 4b. There is a gap between the circumferential end faces (divided sections) 4a1 and 4a2 of the half cage 4a and the end faces (divided sections) 4b2 and 4b1 of the half cage 4b opposed to the end faces 4a1 and 4a2. S1 and S2 are formed.

  FIG. 3 is an enlarged view of a main part of FIG. Out of the circumferential end faces 4a1 and 4a2 of the half cage 4a, the end surface 4a1 located in front of the half cage 4a in the rotational direction (arrow a direction) is a radial direction for lubricating oil supplied from the oil supply hole 13 The inclined surface 14 is raked inward. The inclined surface 14 is gradually inclined in the opposite direction with respect to the rotation direction of the half cage 4a as it goes from the radially outer side to the radially inner side of the half cage 4a. The inclination angle θ1 of the inclined surface 14 is set to 15 to 65 degrees with respect to an imaginary line X1 connecting the axis C1 of the cage 4 and the inner peripheral end P1 of the inclined surface 14.

  In FIG. 1, among the circumferential end surfaces 4b1 and 4b2 of the half cage 4b, the end surface 4b1 located forward of the half cage 4b in the rotational direction (arrow a direction) is the end surface 4a1 of the half cage 4b. It is set as the inclined surface 14 similarly. As shown in FIG. 2, each inclined surface 14 is formed over the entire length L1 in the axial direction of the end surfaces 4a1 and 4b1. Accordingly, as shown in FIG. 3, when the lubricating oil flowing in the direction of the arrow b along the oil supply hole 13 through the supply passage 26 reaches the inner peripheral surface of the half outer ring 2a, each half retainer 4a, 4a. Is guided in the radially inward direction (arrow c direction) along each inclined surface 14 by rotating in the arrow a direction.

  According to the split roller bearing 1 having the above-described configuration, the inclination of the half cages 4a and 4b that gradually inclines in the opposite direction with respect to the rotation direction of the half cages 4a and 4b from the radially outer side toward the radially inner side. Due to the surface 14, the lubricant supplied from the oil supply hole 13 of the half outer ring 2 a is scraped inward in the radial direction by the half cages 4 a and 4 b by the high-speed rotation of the shaft 5 and guided into the bearing. be able to. Thereby, even if the supply amount of the lubricating oil is small, it is possible to suppress the seizure of the bearing due to insufficient lubrication, and thus the durability of the split roller bearing 1 can be improved.

  Further, since the inclined surface 14 is formed on the circumferential end surfaces 4a1 and 4b1 of the half cages 4a and 4b, the strength of the half cages 4a and 4b is caused by the formation of the inclined surface 14. It can suppress that it falls.

  Further, since the inclined surface 14 is formed over the entire length L1 in the axial direction of the end surfaces 4a1 and 4b1, the lubricating oil can be scraped efficiently by the inclined surface 14.

Figure 4 is a sectional view showing a split rolling bearing according to the implementation embodiments of the present invention. The difference between the second embodiment and the first embodiment is that the inclined surface formation position in the cage is different. Among the embodiments, the reference embodiment as the same structure will be omitted denoted the reference embodiment and the same reference numerals.

Holder 30 in the embodiment of this is, semicircular pair of half cage 30a, consists 30b. 5 is a cross-sectional view taken along line BB in FIG. 4 and 5, the half cages 30a and 30b are a pair of annular portions 31 arranged at both ends in the axial direction, and extend in the axial direction between the annular portions 31, and are equally spaced in the circumferential direction. And a plurality of pillars 32 that connect the two annular parts 31 to each other. The roller 3 is accommodated in a pocket 33 surrounded by the adjacent column part 32 and the pair of annular parts 31, and the roller 3 is held at a predetermined interval along the circumferential direction (see FIG. 6).

  6 is an enlarged view of a main part of FIG. Of the side wall surfaces on both sides in the circumferential direction of each column part 32, the lubricating oil supplied from the oil supply hole 13 has a diameter on the side wall surface 32 a positioned in front of the rotation direction of the half cages 30 a and 30 b (arrow a direction). An inclined surface 34 is formed to be raked inward in the direction. The inclined surface 34 is gradually inclined in the opposite direction with respect to the rotation direction (arrow a direction) of the half cages 30a and 30b from the outside in the radial direction to the inside in the radial direction of the half cages 30a and 30b. Yes. The inclination angle θ2 of the inclined surface 34 is set to 15 to 65 degrees with respect to a virtual line X2 connecting the axis C2 of the cage 30 and the inner peripheral end P2 of the inclined surface 34.

  In FIG. 5, each inclined surface 34 is formed on a part of the side wall surface 32 a in the axial direction so as to correspond to the oil supply hole 13. Specifically, an inclined surface 34 is formed in a portion of the side wall surface 32a that is located radially inward of the oil supply hole 13 over a length L2 that is slightly longer than the hole diameter of the oil supply hole 13. Thus, as shown in FIG. 6, when the lubricating oil flowing in the direction of the arrow b along the oil supply hole 13 through the supply passage 26 reaches the inner peripheral surface of the half outer ring 2a, each half retainer 30a, 30b. Is guided in the radially inward direction (arrow d direction) along each inclined surface 34 by rotating in the arrow a direction.

  Also in the split roller bearing having the above-described configuration, the lubricating oil supplied from the oil supply hole 13 of the half outer ring 2 a is rotated by the inclined surface 34 by rotating the half retainers 30 a and 30 b by the high-speed rotation of the shaft 5. It can be squeezed inward and guided into the bearing. Thereby, even if the supply amount of the lubricating oil is small, it is possible to suppress seizure of the bearing due to insufficient lubrication, and therefore it is possible to improve the durability of the double split bearing. Moreover, since the inclined surface 34 is formed only in a part of the column portion 32 in the axial direction, it is possible to prevent the strength of the half cages 30a and 30b from being reduced due to the formation of the inclined surface 34. can do.

The present invention is not limited to the above embodiment and can be implemented with appropriate modifications. For example, in the embodiment of this, the inclined surface 34 is formed on the column portion 32, to which pressurized forte, inclined slope 14 may be formed on the partial cross-section of the cage 4.

A plurality of oil supply holes 13 may be formed in the axial direction of the outer ring 2. In this case, a plurality of the inclined surfaces 34 of the second embodiment may be formed in the axial direction of the column portion 32 so as to be disposed radially inward of each oil supply hole 13.
Further, although the journal portion of the crankshaft is exemplified as the shaft fitted into the bearing, the bearing device of the present invention can be applied to other shafts such as a crankpin of the crankshaft and a camshaft.

Moreover, although embodiment mentioned above is provided with the needle bearing which used the roller as a rolling element, the ball bearing which used the ball as a rolling element can also be employ | adopted.
Further, the cage is not limited to the split structure, but may be configured to have a ring structure divided at one place in the circumferential direction, and the divided place may be expanded and attached to the outer peripheral side of the shaft. In this case, an inclined surface may be formed on at least one of the two cross sections in the circumferential direction of the cage.

  1: two split rolling bearing, 2: outer ring, 3: roller (rolling element), 4, 30: cage, 4a1, 4b1: end face (divided section), 5: shaft, 11: raceway surface, 13: oil supply hole, 14 , 34: inclined surface, 24: support hole, 21: housing, 32: pillar, 33: pocket

Claims (4)

An outer ring having an oil supply hole penetrating in the radial direction and divided in two in the circumferential direction;
A plurality of rolling elements that roll on the inner raceway surface of the outer ring;
A cage that is divided at at least one location on the circumference and holds the rolling elements at a predetermined interval along the circumferential direction;
A split bearing in which a shaft is internally fitted and rotation of the cage is guided by the outer ring,
The cage is gradually inclined in the reverse direction with respect to the rotation direction of the cage as it goes from the radially outer side to the radially inner side, and the lubricating oil supplied from the oil supply hole is changed in diameter by the rotation of the cage. An inclined surface that is scraped inward is formed ,
2. The two-rolling bearing according to claim 1, wherein the inclined surface is formed in a portion corresponding to the oil supply hole in a column portion between pockets of the cage.   2. The split bearing according to claim 1, wherein the inclined surface is formed on at least one of the circumferentially divided sections of the cage.   The split bearing according to claim 2, wherein the inclined surface is formed over the entire axial length of the divided section. Two split rolling bearings according to any one of claims 1 to 3 ,
And a housing having a support hole for tightly fitting and supporting an outer ring of the split roller bearing.

Images