JP2018159421A - bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing easy to hold lubricant and form an oil film.SOLUTION: A bearing 200 includes an oil reservoir 221 formed on an inner peripheral surface 220 and configured to hold lubricant, wherein by forming a plurality of oil reservoir 221 on a row along a circumferential direction, an oil reservoir group A is formed. In the oil reservoir group A, oil reservoirs 332 adjacent in the circumferential direction are formed at an interval D that is equal to or more than 30% of a circumferential length of the inner peripheral surface 220.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a technology for a bearing that rotatably supports a shaft member.

  Conventionally, the technology of a bearing that rotatably supports a shaft member has been publicly known. For example, as described in Patent Document 1.

  Patent Document 1 discloses a technique related to a bearing (slide bearing) that supports a shaft member (specifically, a technique related to a thin plate-like sliding member used in the bearing). On the sliding surface (sintered alloy layer) of the sliding member, a large number of hemispherical recesses that form oil pools are formed over the entire surface. Thus, by forming the concave portion over the entire sliding surface, it is possible to easily hold the lubricating oil on the sliding surface.

  However, when a recess is formed in the entire sliding surface as in the technique described in Patent Document 1, it is easy to hold the lubricating oil on the sliding surface, while generating an oil film pressure (forming an oil film). It is difficult to ensure a smooth sliding surface (flat surface). For this reason, there exists a possibility that the performance (seizure resistance, abrasion resistance) as a bearing may fall.

JP 2009-2410 A

  The present invention has been made in view of the situation as described above, and a problem to be solved is to provide a bearing that is easy to hold a lubricating oil and easily form an oil film.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, in claim 1, the bearing is provided with a lubricating oil holding portion for holding lubricating oil on the inner peripheral surface, and the lubricating oil is formed by forming a plurality of the lubricating oil holding portions on a row along the circumferential direction. A holding portion group is formed, and in the lubricating oil holding portion group, the circumferentially adjacent lubricating oil holding portions are formed at intervals of not less than 30% of the circumferential length of the inner peripheral surface. It is what is done.

  According to a second aspect of the present invention, the lubricating oil holding portion groups are formed in a plurality of rows in the axial direction, and the lubricating oil holding portion groups adjacent in the axial direction are formed at intervals.

  According to a third aspect of the present invention, the lubricating oil retaining portion is formed in a shape having a longer circumferential length than an axial length.

  According to a fourth aspect of the present invention, the ratio of the region where the lubricating oil retaining portion group is formed to the axial width of the inner peripheral surface is set to be 60% or less.

  As effects of the present invention, the following effects can be obtained.

  According to the first aspect, the lubricating oil can be easily held and an oil film can be easily formed.

  According to the second aspect, it is possible to easily form the oil film more effectively.

  According to the third aspect, the oil film can be easily formed more effectively.

  According to the fourth aspect, the lubricating oil can be easily held and an oil film can be easily formed.

Sectional drawing which shows the use condition of the bearing which concerns on 1st embodiment of this invention. (A) The expansion | deployment schematic diagram of the bearing which concerns on 1st embodiment. (B) The expansion | deployment schematic diagram of the bearing which concerns on a 1st modification. (A) The expansion | deployment schematic diagram of the bearing which concerns on a 2nd modification. (B) The expansion | deployment schematic diagram of the bearing which concerns on a 3rd modification. (A) The expansion | deployment schematic diagram of the bearing which concerns on a 4th modification. (B) The expansion | deployment schematic diagram of the bearing which concerns on a 5th modification. (A) The expansion | deployment schematic diagram of the bearing which concerns on 2nd embodiment. (B) The expansion | deployment schematic diagram of the bearing which concerns on a 6th modification. (A) The expansion | deployment schematic diagram of the bearing which concerns on 3rd embodiment. (B) The expansion | deployment schematic diagram of the bearing which concerns on 4th embodiment. (A) The expansion | deployment schematic diagram of the bearing which concerns on 5th embodiment. (B) The expansion | deployment schematic diagram of the bearing which concerns on a 7th modification. The expansion | deployment schematic diagram of the bearing which concerns on an 8th modification. The figure which showed the example of the shape of an oil pool. The figure which showed the cross-sectional shape of the oil pool. The figure which showed the example of the cross-sectional shape of an oil pool.

  In the following description, directions indicated by arrows C, R, and S in the figure are defined as an axial direction, a radial direction, and a circumferential direction of a bearing 100 (shaft 2) to be described later, respectively.

  First, the state where the bearing 100 according to the first embodiment of the present invention is used will be described with reference to FIG.

  The bearing 100 supports a shaft member (a shaft 2 described later in the present embodiment) so as to be smoothly rotatable. The bearing 100 according to the present embodiment is provided in a transmission (for example, an automatic transmission (A / T), a continuously variable transmission (CVT), etc.) included in an automobile. The bearing 100 is attached to the housing 1 of the transmission and supports the shaft 2 to be rotatable.

  The housing 1 is a member that supports various shaft members, gears, and the like provided in the transmission. The housing 1 is formed with a bearing portion 1a through which the shaft 2 can be inserted. The bearing portion 1a is formed so as to penetrate the housing 1 along the axial direction. The bearing portion 1a is formed to have a circular cross section when viewed in the axial direction.

  The bearing 100 is formed in a substantially cylindrical shape. The bearing 100 is fixed to the housing 1 by fitting the outer peripheral surface 110 of the bearing 100 into the bearing portion 1 a of the housing 1.

  The shaft 2 is a member that transmits driving force by rotating. The shaft 2 is inserted into the bearing 100 and is rotatably supported by the inner peripheral surface 120 of the bearing 100. An axial oil passage 2a, which is an oil passage for guiding the lubricating oil, is formed at the center (axial center) of the shaft 2. Further, the shaft 2 has a radial oil passage 2b which is an oil passage for guiding the lubricating oil from the axial oil passage 2a to the outer peripheral surface of the shaft 2 (a portion facing the axial central portion of the bearing 100). It is formed.

  Lubricating oil is supplied to the bearing 100 configured in this way via the oil passages (the axial oil passage 2a and the radial oil passage 2b) of the shaft 2. Specifically, when the engine of the automobile is started, the oil pump is operated by the driving force of the engine, the driving force of the electric motor, or the like. Lubricating oil is pumped by the oil pump, and the lubricating oil is supplied to the bearing 100 through the axial oil passage 2a and the radial oil passage 2b.

  A lubricating oil film (oil film) is formed between the inner peripheral surface 120 of the bearing 100 and the shaft 2 by the lubricating oil supplied to the bearing 100. The shaft 2 is rotatably supported by the bearing 100 through the oil film. Moreover, since the bearing 100 supports the shaft 2 via an oil film, the occurrence of seizure between the bearing 100 and the shaft 2 can be suppressed.

  Next, a detailed configuration of the bearing 100 will be described with reference to FIG.

  A plurality of oil pools 121 are formed on the inner peripheral surface 120 of the bearing 100.

  The oil sump 121 is a recess formed so as to recess the inner peripheral surface 120 of the bearing 100. The oil sump 121 is formed in a substantially elliptical shape elongated in the circumferential direction. Specifically, the oil sump 121 is formed such that the circumferential length (width) is longer than the axial length (width). It is desirable that the circumferential width of the oil sump 121 be formed to be twice or more the axial width.

  In the present embodiment, the plurality of oil reservoirs 121 are formed in a predetermined range on the inner peripheral surface 120 of the bearing 100. Hereinafter, the range in which the oil pool 121 is formed will be specifically described.

  As shown in FIG. 2A, the inner peripheral surface 120 is set with two regions (oil sump formation region T1 and smooth region T2) in the axial direction.

  The oil pool formation region T1 is a region where the oil pool 121 is formed. One oil pool formation region T1 is set at the axially central portion of the inner peripheral surface 120.

  In the one oil pool formation region T1, a plurality of oil pools 121 are formed side by side in the circumferential direction. The oil pool 121 is formed at an appropriate interval in the circumferential direction. In the oil pool formation region T1, a pair (two) of oil pools 121 and one oil pool 121 are alternately formed along the circumferential direction of the inner peripheral surface 120.

  2A is a schematic diagram to the last, and the number of the oil sump 121 is not limited to that shown in FIG. 2A. Further, all the oil reservoirs 121 may be arranged alternately (with the phase shifted in the circumferential direction).

  The smooth region T2 is a region other than the oil pool formation region T1 on the inner peripheral surface 120, and is a region where the oil pool 121 is not formed. In the smooth region T2, the oil pool 121 is not formed over the entire circumferential direction. The smooth region T2 is set at both axial ends of the inner peripheral surface 120 (two locations, one end and the other end).

  Here, the axial width of the oil pool formation region T1 is set to be 50% or less of the axial width of the inner peripheral surface 120. That is, the oil puddle formation region T1 is set so as not to occupy a large proportion on the inner peripheral surface 120. In particular, in the present embodiment, since the oil pool 121 is elongated in the circumferential direction, it is easy to suppress the axial width of the oil pool formation region T1 (the ratio occupied in the inner circumferential surface 120).

  Thus, in the bearing 100 according to the first embodiment, the oil pool forming region T1 is set at one place on the inner peripheral surface 120, and the oil pool forming region is included in the axial width of the inner peripheral surface 120. The ratio occupied by T1 is set to be 50% or less.

  When the shaft 2 is supported by the bearing 100 configured as described above, the lubricating oil can be held in the oil pool formation region T1 (oil pool 121), and therefore the lubricating oil is hardly insufficient. In particular, a plurality of oil reservoirs 121 according to the present embodiment are formed so as to be divided in the circumferential direction. For this reason, it is possible to prevent the lubricating oil in the oil pool 121 from flowing downward due to gravity, and to increase the holding force of the lubricating oil in the oil pool 121. As a result, even when the lubricating oil from the oil pump is not supplied, such as immediately after the engine is started, lubrication can be performed with the lubricating oil held in the oil pool 121.

  Further, when the shaft 2 rotates, an oil film can be generated without interruption throughout the entire circumferential direction in the smooth region T2. Thereby, seizure resistance and wear resistance can be ensured. In particular, in the present embodiment, the oil pool formation region T1 and the smooth region T2 are set symmetrically across the axial center of the inner peripheral surface 120, so that the oil film is formed substantially symmetrical (generally symmetrical) in the axial direction. Therefore, stable seizure resistance and wear resistance can be ensured. Furthermore, in this embodiment, by forming the oil reservoir 121 in the center in the axial direction of the inner peripheral surface 120, an oil film can be generated at both ends (smooth region T2) of the inner peripheral surface 120, and the shaft High seizure resistance and the like can be exhibited even with respect to 2 pieces. Furthermore, as in this embodiment, when the oil passage formed in the shaft 2 (the radial oil passage 2b, see FIG. 1) is opposed to the axially central portion of the inner peripheral surface 120, the radial oil Lubricating oil from the path 2b can be easily guided to the oil pool formation region T1 (oil pool 121).

  Moreover, in the axial direction, the smooth surface (smooth region T2) for forming the oil film can be secured widely by suppressing the ratio of the oil puddle formation region T1 in the inner peripheral surface 120 to 50% or less. Thereby, seizure resistance and wear resistance can be effectively ensured.

  Below, the modification (from a 1st modification to a 5th modification) of the above-mentioned 1st embodiment is demonstrated.

  First, the bearing 100 which concerns on a 1st modification is demonstrated using FIG.2 (b). In the bearing 100 according to the first modification shown in FIG. 2 (b), the oil pool formation region T1 is 1 at a position offset in the axial direction of the inner peripheral surface 120, more specifically, slightly to the right of the page. Is set. In the oil pool formation region T1, a plurality of oil pools 121 are formed in a line in the circumferential direction.

  As described above, the oil pool formation region T1 is not necessarily set at the center in the axial direction of the inner peripheral surface 120, and can be set at an arbitrary position. For example, the lubricating oil can be easily guided to the oil pool formation region T1 (oil pool 121) by setting the position according to the oil path formed in the shaft 2 (the radial oil path 2b, see FIG. 1). Can do.

  Next, the bearing 100 which concerns on a 2nd modification is demonstrated using Fig.3 (a). In the bearing 100 according to the second modification shown in FIG. 3A, one oil pool formation region T <b> 1 is set at the axially central portion of the inner peripheral surface 120. The oil sump 121 formed in the oil sump formation region T1 is formed at an asymmetric position with the axial center of the inner peripheral surface 120 (the axial center of the oil sump formation region T1) interposed therebetween. Thus, the oil pool 121 can be formed at an arbitrary position in the oil pool formation region T1.

  Next, the bearing 100 which concerns on a 3rd modification is demonstrated using FIG.3 (b). In the bearing 100 according to the third modification shown in FIG. 3B, one oil pool formation region T <b> 1 is set at the axial end of the inner peripheral surface 120. Thus, the oil pool formation region T1 can be set not at the midway portion of the axial width of the inner peripheral surface 120 but at the end portion.

  Next, the bearing 100 which concerns on a 4th modification is demonstrated using Fig.4 (a). In the bearing 100 according to the fourth modification shown in FIG. 4A, one oil pool formation region T <b> 1 is set at the axially central portion of the inner peripheral surface 120. In the oil pool formation region T1, a plurality of oil pools 121 are formed in two rows in the circumferential direction.

  Here, in the present embodiment, as shown in FIG. 4A, even if there is a region t in which the oil puddle 121 is not formed between the oil puddles 121, the oil puddle 121 is formed. This region is regarded as one oil pool formation region T1. Specifically, when the axial width of the region t is 40% or less of the axial width of the inner peripheral surface 120, the region where the oil pool 121 is formed may be regarded as one oil pool forming region T1. it can.

  Thus, there may be some regions where the oil pool 121 is not formed in one oil pool formation region T1.

  Next, the bearing 100 which concerns on a 5th modification is demonstrated using FIG.4 (b). In the bearing 100 according to the fifth modification shown in FIG. 4B, one oil pool formation region T <b> 1 is set at the axially central portion of the inner peripheral surface 120. In the oil pool formation region T1, a plurality of oil pools 121 are formed in three rows in the circumferential direction. Compared with the oil reservoir 121 in the center row, the oil reservoirs 121 on the left and right sides of the drawing are formed in an elongated shape (the width in the axial direction is narrow).

  Thus, it is not necessary to form all the oil reservoirs 121 in the same shape, and it is also possible to form them in different shapes. Further, the number of rows of the oil sump 121 formed in one oil sump formation region T1 can be arbitrarily determined.

As described above, the bearing 100 according to the first embodiment is a bearing 100 in which an oil sump 121 (lubricating oil retaining portion) that retains lubricating oil is formed on the inner peripheral surface 120 (sliding surface). The peripheral surface 120 is a region set in a predetermined range in the axial direction, and an oil puddle formation region T1 (first region) that is a region where the oil puddle 121 is formed in at least a part of the circumferential direction. A smooth region T2 (second region) that is a region set in a range other than the oil pool formation region T1 and in which the oil pool 121 is not formed over the entire circumferential direction. And the ratio which the said oil pool formation area T1 accounts among the axial direction width | variety of the said internal peripheral surface 120 is set so that it may become 60% or less.
By comprising in this way, it can be made easy to hold | maintain lubricating oil and to form an oil film easily. That is, while the lubricating oil is retained by the oil pool 121, a smooth surface (smooth region T2) for forming an oil film is secured by limiting the range of the oil pool formation region T1 in which the oil pool 121 is formed. can do.

The oil pool formation region T1 is
One location is set on the inner peripheral surface 120,
Of the axial width of the inner peripheral surface 120, the ratio occupied by the oil pool formation region T1 is set to be 50% or less.
By comprising in this way, it can be made easy to hold | maintain lubricating oil and to form an oil film easily. In particular, by arranging the oil pool 121 in a concentrated manner in one oil pool formation region T1, it is possible to easily secure a relatively wide other region (smooth region T2), and thus to easily form an oil film. be able to.

Further, the oil reservoir 121 is formed in a shape having a long circumferential length with respect to an axial length.
By comprising in this way, it can be made easy to form an oil film more effectively. That is, by making the oil sump 121 into an elongated shape (narrow shape), the oil sump formation region T1 can be easily narrowed, and as a result, a smooth surface (smooth region T2) can be easily secured.

The inner peripheral surface 120 according to the present embodiment is an embodiment of the sliding surface according to the present invention.
Moreover, the oil sump 121 which concerns on this embodiment is one Embodiment of the lubricating oil holding | maintenance part which concerns on this invention.
Moreover, the oil pool formation area | region T1 which concerns on this embodiment is one Embodiment of the 1st area | region which concerns on this invention.
Moreover, the smooth region T2 according to the present embodiment is an embodiment of the second region according to the present invention.

  Below, the bearing 200 which concerns on 2nd embodiment is demonstrated using Fig.5 (a). Similar to the bearing 100 according to the first embodiment, the bearing 200 according to the second embodiment includes an outer peripheral surface (not shown) and an inner peripheral surface 220, and the inner peripheral surface 220 includes a plurality of oil reservoirs 221. Is formed.

  In the bearing 200 according to the present embodiment, two oil puddle formation regions T1 are set at both axial ends of the inner peripheral surface 220, respectively. The axial widths of the two oil pool formation regions T1 are set to be substantially the same. That is, the oil pool formation region T1 is set substantially symmetrically in the axial direction.

  Further, the total value of the axial widths of the two oil pool formation regions T1 is set to be 60% or less of the axial width of the inner peripheral surface 120.

  By setting the oil pool formation region T1 in this way, the smooth region T2 can be widely secured at the center in the axial direction of the inner peripheral surface 220. As a result, the oil film can be concentrated at the center in the axial direction of the inner peripheral surface 220, and the oil film thickness can be easily ensured. As a result, stable seizure resistance and wear resistance can be ensured. Moreover, since stable seizure resistance and wear resistance can be ensured in this way, the ratio (60% or less) of the oil pool formation region T1 on the inner peripheral surface 120 is set to be less than that of the first embodiment (50% or less). Can also be increased.

  Hereinafter, a modified example (sixth modified example) of the above-described second embodiment will be described with reference to FIG.

  In the bearing 200 according to the sixth modified example, unlike the second embodiment (FIG. 5A), two oil pool formation regions T1 are set asymmetrically across the center of the inner peripheral surface 220. Specifically, in the example shown in FIG. 5B, the width of the oil pool formation region T1 on the right side of the paper is set to be larger than the width of the oil pool formation region T1 on the left side of the paper. . Thus, the two oil sump formation regions T1 may be set asymmetrically.

As described above, the oil pool formation region T1 according to the second embodiment is
It is set at two locations, one end and the other end in the axial direction of the inner circumference 2120,
Of the axial width of the inner peripheral surface 220, the ratio occupied by the oil pool formation region T1 is set to be 60% or less.
By comprising in this way, an oil film can be concentrated on the axial direction center of the internal peripheral surface 220, and it can be made easy to ensure an oil film thickness.

  Below, the bearing 300 which concerns on 3rd embodiment is demonstrated using Fig.6 (a). Similar to the bearing 100 according to the first embodiment, the bearing 300 according to the third embodiment includes an outer peripheral surface (not shown) and an inner peripheral surface 320, and the inner peripheral surface 320 includes a plurality of oil pools 321. Is formed.

  In the bearing 300 according to the present embodiment, the two oil pool formation regions T1 are set in the midway portion of the inner peripheral surface 320 in the axial direction (positions away from both axial end portions of the inner peripheral surface 320). The two oil puddle formation regions T1 are set at symmetrical positions with respect to the axial center of the inner peripheral surface 320.

  The total value of the axial widths of the two oil pool formation regions T1 is set to be 40% or less of the axial width of the inner peripheral surface 320.

  By setting the oil pool formation region T1 in this way, the smooth region T2 is not concentrated on a part (for example, the central portion) of the inner peripheral surface 320, but is set dispersed in the axial direction of the inner peripheral surface 320. can do. This makes it possible to equalize the oil film in the axial width of the inner peripheral surface 320 (generate it as evenly as possible), and to secure a load capacity over the entire inner peripheral surface 320.

As described above, the oil pool formation region T1 according to the third embodiment is
It is set at two places other than both ends in the axial direction of the inner peripheral surface 320,
Of the axial width of the inner peripheral surface 320, the ratio occupied by the oil pool formation region T1 is set to be 40% or less.
By comprising in this way, the equalization of the oil film in the internal peripheral surface 320 can be achieved.

  Note that the two oil puddle formation regions T1 according to the third embodiment are set symmetrically with respect to the center in the axial direction of the inner peripheral surface 320, but may be set asymmetrical.

  Below, the bearing 400 which concerns on 4th embodiment is demonstrated using FIG.6 (b). Similar to the bearing 100 according to the first embodiment, the bearing 400 according to the fourth embodiment includes an outer peripheral surface (not shown) and an inner peripheral surface 420, and the inner peripheral surface 420 has a plurality of oil reservoirs 421. Is formed.

  In the bearing 400 according to the present embodiment, the three oil puddle formation regions T1 are set at a midway portion in the axial direction of the inner peripheral surface 420 (a position away from both axial end portions of the inner peripheral surface 420). The three oil puddle formation regions T1 are set at symmetrical positions with respect to the axial center of the inner peripheral surface 420.

  The total value of the axial widths of the three oil pool formation regions T1 is set to be 50% or less of the axial width of the inner peripheral surface 420.

  By setting the oil pool formation region T1 in this way, the smooth region T2 is not concentrated on a part of the inner peripheral surface 420 (for example, the central portion), but is set dispersed in the axial direction of the inner peripheral surface 420. can do. This makes it possible to equalize the oil film in the axial width of the inner peripheral surface 420 (generate it as evenly as possible), and to secure a load capacity over the entire inner peripheral surface 420.

As described above, the oil pool formation region T1 according to the fourth embodiment is
It is set at three or more locations other than both axial end portions of the inner peripheral surface 420,
Of the axial width of the inner peripheral surface 420, the ratio occupied by the oil pool formation region T1 is set to be 50% or less.
By configuring in this way, the oil film on the inner peripheral surface 420 can be equalized.

  The two oil puddle formation regions T1 according to the fourth embodiment are set symmetrically with respect to the center in the axial direction of the inner peripheral surface 420, but can also be set asymmetrical.

  Below, the bearing 500 which concerns on 5th embodiment is demonstrated using Fig.7 (a). Similar to the bearing 100 according to the first embodiment, the bearing 500 according to the fifth embodiment includes an outer peripheral surface (not shown) and an inner peripheral surface 520, and the inner peripheral surface 520 includes a plurality of oil reservoirs 521. Is formed.

  In the present embodiment, the plurality of oil reservoirs 521 are formed so as to be arranged in a line along the circumferential direction on the inner peripheral surface 520, thereby forming the oil reservoir group A. Furthermore, in the present embodiment, three (three rows) oil sump groups A are formed on the inner peripheral surface 520. The oil sump group A is formed at an appropriate interval in the axial direction so that the widths do not overlap with the oil sump group A in the adjacent row.

  In the oil sump group A, the interval D (distance between the centers of the adjacent oil sumps 221) in the circumferentially adjacent oil sump 521 is 30% or more of the circumferential length (peripheral length) of the inner peripheral surface 520. Is set to be That is, it is formed so that adjacent oil pools 521 do not approach too much.

  Moreover, the oil sump 521 of the adjacent oil sump group A is formed alternately in the circumferential direction. Specifically, the oil puddle 521 of one oil puddle group A and the oil puddle 521 of the other oil puddle group A are formed with their phases shifted in the circumferential direction. At this time, the oil sump 521 of one oil sump group A and the oil sump 521 of the other oil sump group A are alternately formed in the circumferential direction.

  When the shaft 2 is supported by the bearing 500 configured as described above, the lubricating oil can be held in the oil pool 521, and therefore the lubricating oil is hardly insufficient.

  Further, the lubricating oil that has flowed out of the oil pool 521 in response to the rotation of the shaft 2 generates an oil film pressure on a smooth surface between the circumferentially adjacent oil pools 521 and forms an oil film. Here, in this embodiment, since the interval D between adjacent oil pools 521 is large (30% or more of the circumferential length of the inner peripheral surface 520), the oil film pressure is easily generated (an oil film is formed). easy). Thereby, stable seizure resistance and wear resistance can be ensured.

  In particular, in the present embodiment, the oil puddles 521 of the adjacent oil puddle groups A are alternately formed, so that the oil puddles 521 are prevented from concentrating on a part of the inner peripheral surface 520, and the inner peripheral surface 520 is smooth. Can be easily secured. Thereby, seizure resistance and wear resistance can be effectively ensured.

  In the present embodiment, the interval D between the oil reservoirs 521 adjacent in the circumferential direction has been described as the distance between the centers of the adjacent oil reservoirs 521. For example, between the opposing ends of the adjacent oil reservoirs 521 The distance D can also be set as the interval D. That is, the length of the smooth surface between adjacent oil reservoirs 521 can be set to be 30% or more of the circumferential length (circumferential length) of the inner peripheral surface 520. By comprising in this way, it becomes easy to ensure a smooth surface widely.

  Below, the modification (7th modification and 8th modification) of the above-mentioned 5th embodiment is demonstrated.

  First, the bearing 500 which concerns on a 7th modification is demonstrated using FIG.7 (b). In the seventh modification shown in FIG. 7B, the oil pool formation region T1 and the smooth region T2 are set in the same manner as the bearing 400 according to the fourth embodiment (see FIG. 6B, etc.). That is, the total axial width of the oil pool formation region T1 is set to be 50% or less of the axial width of the inner peripheral surface 520. That is, the oil pool formation region T1 is set so as not to occupy a very large proportion on the inner peripheral surface 520. For this reason, the oil sump 521 is formed with an axial width appropriately reduced.

  By setting the oil pool formation region T1 and the smooth region T2 in this way, a wide smooth surface (smooth region T2) for forming the oil film can be secured. Thereby, seizure resistance and wear resistance can be effectively ensured.

  Next, the bearing 500 which concerns on an 8th modification is demonstrated using FIG. In the eighth modified example shown in FIG. 8, unlike the bearing 500 according to the fifth embodiment (see FIG. 7A), the oil sumps 521 of the adjacent oil sump group A are formed alternately in the circumferential direction. However, they are formed at the same circumferential position. Thus, the position of the oil sump 521 in the circumferential direction can be arbitrarily determined.

As described above, the bearing 500 according to the present embodiment is a bearing 500 in which the oil sump 521 (lubricating oil holding portion) that holds the lubricating oil is formed on the inner peripheral surface 520, and the bearing 500 is arranged on the row along the circumferential direction. By forming a plurality of oil sumps 521, an oil sump group A (lubricating oil holding portion group) is formed. In the oil sump group A, the oil sump 521 adjacent in the circumferential direction is the circumferential direction of the inner peripheral surface 520. They are formed with a distance D from each other by a length of 30% or more of the length.
By comprising in this way, it can be made easy to hold | maintain lubricating oil and to form an oil film easily. That is, while the lubricating oil is retained by the oil pool 521, the formation of an oil film can be promoted by ensuring a wide smooth surface between the adjacent oil pools 521.

The oil pool groups A are formed in a plurality of rows in the axial direction, and the oil pool groups A adjacent in the axial direction are formed at intervals.
By comprising in this way, it can be made easy to form an oil film more effectively. That is, by ensuring a smooth surface between adjacent oil pool groups A, formation of an oil film can be promoted.

Further, the oil sump 521 is formed in a shape having a longer circumferential length than an axial length.
By comprising in this way, it can be made easy to form an oil film more effectively. That is, by making the oil sump 521 into an elongated shape (narrow shape), the width of the oil sump group A can be easily narrowed, and as a result, a smooth surface between adjacent oil sump groups A can be easily secured. Can do.

Moreover, in the bearing 500 (refer FIG.7 (b)) which concerns on the 7th modification of this embodiment, the area | region (oil pool formation) in which the said oil pool group A is formed among the axial direction widths of the said internal peripheral surface 520. The ratio of the area T1) is set to be 60% or less.
By comprising in this way, it can be made easy to hold | maintain lubricating oil and to form an oil film easily. That is, while the lubricating oil is held by the oil pool 521, a smooth surface (smooth area T2) for forming an oil film is secured by limiting the range of the oil pool formation area T1 in which the oil pool 521 is formed. can do.

  Next, the shape (shape seen from the inner peripheral side) of the oil sump 121 (oil sump 221) will be described. In addition, although the shape of the oil sump 121 which concerns on 1st embodiment is demonstrated below, it is the same also about the oil sump (oil sump 221 grade | etc.,) Which concerns on other embodiment.

  In the first embodiment, the shape of the oil sump 121 is exemplified by a substantially elliptical shape as shown in FIG. 9A, but the present invention is not limited to this. That is, the oil sump 121 only needs to be longer in the circumferential length (width) than in the axial length (width). For example, the oil reservoir 121 may be formed in a diamond shape that is long in the circumferential direction (see FIG. 9B). Moreover, you may form each vertex of the said rhombus in R shape (refer FIG.9 (c)). Moreover, you may form in the oval shape which tied a pair of semicircle which opposes the circumferential direction with the line segment (refer FIG.9 (d)). Moreover, you may form in the hexagon shape formed long in the circumferential direction (refer FIG.9 (e)). Moreover, you may form in the shape asymmetrical in the circumferential direction (refer FIG.9 (f)). The same applies to the oil sump 221 according to the second embodiment.

  Next, the cross-sectional shape (shape in a cross section perpendicular to the axial direction) of the oil sump 121 (oil sump 221) will be described. In the following, the cross-sectional shape of the oil reservoir 121 according to the first embodiment will be described, but the same applies to the oil reservoirs (oil reservoir 221 and the like) according to other embodiments.

  As shown in FIG. 10, the oil sump 121 according to the first embodiment can be formed by a cutting process in which the inner peripheral surface 120 of the bearing 100 is cut with a sharp tool (cutting tool) E. In this case, the shape of the oil sump 121 (the shape viewed from the inner peripheral side) is a shape (substantially rhombus) as shown in FIG. 9B or FIG. 9C. By forming the oil pool 121 by cutting as described above, the stress concentration is less than that in the case of forming by pressing or the like, and the occurrence of material cracking can be suppressed.

  In the cutting process, the tool E is brought into contact with the inner peripheral surface 120 of the bearing 100 while rotating around the predetermined rotation axis (in the example shown in FIG. 10, rotating clockwise along the locus L1). The surface of the peripheral surface 120 is scraped off. For this reason, the cross-sectional shape (shape in a cross section perpendicular | vertical to an axial direction) of the oil sump 121 becomes a substantially circular arc shape.

  Here, the oil sump 121 according to the first embodiment is formed in a shape elongated in the circumferential direction (see FIG. 9 and the like). However, when the oil pool 121 is formed in a shape that is not elongated in the circumferential direction (circular shape or the like), for example, the rotational radius of the tool E is smaller than the locus L1 as shown by the locus L2 in FIG. Will be set. In this case, the angle β between the locus L2 and the inner peripheral surface 120 (smooth surface) is larger than the angle α between the locus L1 and the inner peripheral surface 120 (smooth surface).

  In other words, in this embodiment, the angle α between the oil reservoir 121 and the inner peripheral surface 120 (smooth surface) can be kept small by making the oil reservoir 121 elongated in the circumferential direction. In this way, by suppressing the angle α to be small, it is possible to promote the generation of an oil film pressure due to the wedge effect, and as a result, seizure resistance and wear resistance can be effectively ensured.

  Although FIG. 10 shows an example in which the cross-sectional shape of the oil sump 121 is formed in a substantially arc shape, the present invention is not limited to this. For example, the oil sump 121 may have a linear shape in a cross-sectional view (see FIG. 11A). Further, the oil sump 121 may have a shape that is asymmetric in the circumferential direction (see FIG. 11B). Further, the oil sump 121 may be formed in a rectangular shape in cross section (see FIG. 11B). By forming such a rectangular oil pool 121, the amount of lubricating oil retained can be increased.

  As mentioned above, although embodiment and the modification of this invention were described, this invention is not limited to the said structure, A various change is possible within the range of the invention described in the claim.

  For example, the shape, number, size, and the like of the oil puddle 121 (including other oil puddles 221 and the like) shown in the above-described embodiments and modifications are examples, and can be changed as appropriate. Moreover, you may form the some oil sump 121 in a mutually different shape, a magnitude | size, etc.

  In addition, the numbers, ranges, and the like of the oil puddle formation region T1 and the smooth region T2 shown in the embodiment and the modification are examples, and can be appropriately changed.

  Moreover, the number, arrangement | positioning, etc. of the oil sump group A shown in the said embodiment and modification are examples, and can be changed suitably.

  Further, in the fifth embodiment (see FIG. 7), an example has been shown in which the oil sump group 521 is formed by arranging the oil sump 521 straight in a line along the circumferential direction. It is not limited. That is, the oil pool group A may be slightly shifted in the axial direction as long as the plurality of oil pools 521 are arranged in a line (if the oil pool group A partially overlaps in the circumferential direction).

  In the above-described embodiment, the bearing 100 is described as being provided in a transmission included in an automobile. However, the present invention is not limited to this and can be used for various applications. The same applies to the bearing 200 according to other embodiments.

  Moreover, in the said embodiment, although the inner peripheral surface 120 of the bearing 100 and the shaft 2 demonstrated the example which slides, this invention is not restricted to this, The outer peripheral surface 110 of the bearing 100, another member, May slide. In this case, an oil pool similar to that in the above embodiment can be formed on the outer peripheral surface 110. The same applies to the bearing 200 according to other embodiments.

  Moreover, in the said embodiment, although the example which forms the oil sump 121 (other oil sumps 221 grade | etc.,) By cutting was shown, this invention is not limited to this, It forms with various processing methods. It is possible.

  Further, as shown in the seventh modification of the fifth embodiment (see FIG. 7B), the configurations from the first embodiment to the fourth embodiment and the configuration of the fifth embodiment are combined. It is also possible. For example, the distance between the oil reservoirs 121 formed in the oil reservoir formation region T1 in the first embodiment (for example, see FIG. 2A) is set to the circumferential length of the inner peripheral surface 220 as in the fifth embodiment ( It is also possible to set the length to be 30% or more of (peripheral length).

  In the above embodiment, for simplification of description, the axial end portion of the bearing 100 is described as not chamfered. In this case, since the axial width of the entire bearing 100 is equal to the axial width of the inner peripheral surface 120, the arrangement of the oil sump 121 and the like has been described with reference to the axial width.

  However, when chamfering the axial end of the bearing 100, the inner circumferential surface 120 (specifically, the inner surface of the bearing 100 (the surface facing inward) is not the axial width of the entire bearing 100. Among these, the arrangement of the oil sump 121 is determined based on the axial width of the portion excluding the chamfered portion. The same applies to the bearing 200 according to other embodiments.

DESCRIPTION OF SYMBOLS 1 Housing 2 Shaft 500 Bearing 520 Inner peripheral surface 521 Oil pool

Claims (4)

A bearing in which a lubricating oil retaining portion for retaining lubricating oil is formed on an inner peripheral surface,
A lubricating oil holding part group is formed by forming a plurality of the lubricating oil holding parts on a row along the circumferential direction,
In the lubricating oil holding part group,
The lubricating oil holding portion adjacent in the circumferential direction is
The inner circumferential surface is formed at a distance from each other by a length of 30% or more of the circumferential length.
bearing. The lubricating oil holding portion group is formed in a plurality of rows in the axial direction,
The lubricating oil holding portion group adjacent in the axial direction is
Formed at intervals from each other,
The bearing according to claim 1. The lubricating oil holding part is
Formed in a shape with a long circumferential length relative to the axial length,
The bearing according to claim 1 or claim 2. Of the axial width of the inner peripheral surface, the ratio of the region where the lubricating oil retaining portion group is formed is set to be 60% or less.
The bearing according to any one of claims 1 to 3.

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