JP2010159789A - Thrust roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thrust roller bearing capable of preventing reverse assembly without increasing the rotating torque. <P>SOLUTION: On the outer diameter of an inner race 12, four protruded parts 27 and at least four recessed parts are provided which have maximum diameter portions located outward in the radial direction beyond the outer diameter of a bent part 25 of an outer race 13 to prevent reverse assembly, and which have minimum diameter portions located inward in the radial direction beyond the inner diameter of the bent part 25 of the outer race 13 to form a lubricant distribution passage P between the bent part 25 of the outer race 13 and themselves, respectively. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a thrust roller bearing used in an automobile transmission or the like.

  The thrust roller bearing includes an inner race and an outer race formed annularly, a plurality of rollers arranged between both races, and a cage that holds the plurality of rollers, and is provided in the inner race inner diameter portion. The short cylindrical bent portion and the inner diameter portion of the cage are fitted together, and the short cylindrical bent portion provided in the outer race outer diameter portion and the outer diameter portion of the cage are fitted together. It is known that both races and cages are not separable. The thrust roller bearing is used in such a manner that an outer race is used by being fitted in an outer race guide member (for example, a housing), and an inner race is used by being fitted in an inner race guide member (for example, a rotating shaft). There is an inner race guide to be played.

  In such a thrust roller bearing, if it is assembled in reverse on an automatic transmission or the like, if it is installed in reverse, seizure is likely to occur due to sliding with the mating guide member, etc., so the inner race and outer race directions are assembled correctly. There is a need. In order to prevent reverse assembly, a staking (tab) for preventing reverse assembly is provided at the bent portion of the inner race or outer race, and in Patent Document 1, it is used as an outer race guide. In this case, it is disclosed that reverse assembly is prevented by making the outer diameter of the inner race larger than the outer diameter of the outer race.

  Lubricating of thrust roller bearings used in automobile transmissions is usually performed by lubricating oil that circulates inside the rotating shaft as a passage, and the lubricating oil is divided between the inner race bent portion and the outer race inner diameter portion. Is supplied to the inside of the thrust roller bearing through the gap between the outer race and the gap between the outer diameter portion of the inner race and the bent portion of the outer race.

Japanese Utility Model Publication No. 5-36160

  In thrust roller bearings used in automobiles, there is a problem of contributing to lower fuel consumption by reducing rotational torque. The structure for preventing reverse assembly of the thrust roller bearing of Patent Document 1 is easier to manufacture than the structure in which the anti-reverse anti-assembly staking (tab) is provided at the bent portion of the outer race. And the outer race bend portion become narrow, there is a possibility that the lubricating oil is not properly discharged, and in this case, the rotational torque may increase.

  An object of the present invention is to provide a thrust roller bearing capable of preventing reverse assembly without increasing rotational torque.

  A thrust roller bearing according to a first aspect of the present invention includes an inner race and an outer race both formed in an annular shape, a plurality of rollers disposed between both races, and a cage that holds the plurality of rollers. The short cylindrical bent portion provided in the inner diameter portion and the inner diameter portion of the cage are fitted together, and the short cylindrical bent portion provided in the outer race outer diameter portion and the outer diameter portion of the cage are In the thrust roller bearing in which both the race and the cage cannot be separated by being fitted, and the outer race is fitted in the outer race guide member, the outer diameter portion of the inner race has a maximum diameter portion. At least one convex portion that is positioned radially outward from the outer diameter of the bent portion of the outer race and prevents reverse assembly, and the minimum diameter portion is radially inward from the inner diameter of the bent portion of the outer race It is characterized in that at least one recess forming a lubricant flow path is provided between the bent portion of the position to the outer race.

  A thrust roller bearing according to a second aspect of the present invention includes an inner race and an outer race both formed in an annular shape, a plurality of rollers disposed between both races, and a cage for holding the plurality of rollers. The short cylindrical bent portion provided in the inner diameter portion and the inner diameter portion of the cage are fitted together, and the short cylindrical bent portion provided in the outer race outer diameter portion and the outer diameter portion of the cage are In a thrust roller bearing in which both the race and the cage cannot be separated by being fitted, and the inner race is fitted in the inner race guide member, the inner diameter portion of the outer race has a minimum diameter portion. At least one convex portion that is positioned radially inward from the inner diameter of the bent portion of the race and prevents reverse assembly, and the maximum diameter portion is radially outer than the outer diameter of the inner race bent portion. Position to is characterized in that at least one recess forming a lubricant flow path is provided between the bent portion of the inner race.

  The inner race is usually attached to the end surface of the rotating shaft and rotates together with the rotating shaft. The outer race is attached to a housing such as a carrier, for example, and may be fixed to the housing or the like, and may be rotatable with respect to the housing or the like. The cage is normally rotatable relative to both races.

  In the thrust roller bearing according to the first invention, the bent portion of the outer race is fitted to the inner periphery of the outer race guide member (for example, the cylindrical inner peripheral portion of the housing) (the radial movement of the bent portion of the inner race). The thrust roller bearing according to the second aspect of the invention is used in an outer race guide, and there is no inner race guide member (for example, a small diameter provided at the end of the rotating shaft). The inner race guide is fitted to the outer periphery of the shaft portion (there is no one that regulates the radial movement of the bent portion of the outer race).

  In the thrust roller bearing according to the first aspect of the invention, since the convex portion whose maximum diameter portion is located radially outward from the outer diameter of the bent portion of the outer race is provided at the outer diameter portion of the inner race, the inner race is It is impossible to fit the race guide member, and reverse assembly is prevented. In the thrust roller bearing according to the second aspect of the invention, since the convex portion whose minimum diameter portion is located radially inward from the inner diameter of the bent portion of the inner race is provided at the inner diameter portion of the outer race, It is impossible to fit the guide member and reverse assembly is prevented.

  For lubrication of thrust roller bearings, the lubricant (lubricating oil) supplied to the end of the rotating shaft is supplied into the bearing from between the bent part of the inner race and the inner diameter part of the outer race, and this lubricant is supplied to the inner race. It is carried out by discharging from between the outer diameter part of this and the bent part of the outer race. In the thrust roller bearing of the first invention, the amount of lubricant passing is reduced at the convex portion of the outer diameter portion of the inner race, but the amount of lubricant passing is ensured by the concave portion. Thus, there is no decrease in the amount of lubricant discharged (decrease in lubricant penetration), which causes an increase in rotational torque, and an increase in rotational torque can be prevented while preventing reverse assembly. In the thrust roller bearing according to the second aspect of the invention, the amount of lubricant passing is reduced at the convex portion of the inner diameter portion of the outer race, but the amount of lubricant passing is secured by the concave portion. In addition, there is no decrease in the amount of lubricant inflow (decrease in lubricant penetration), which causes an increase in rotational torque, and an increase in rotational torque can be prevented while preventing reverse assembly.

  The inner race having the convex portion and the concave portion in the outer diameter portion in the thrust roller bearing of the first invention and the outer race having the convex portion and the concave portion in the inner diameter portion in the thrust roller bearing of the second invention can be formed by press molding. In this case, it is only necessary to change the portion which has been conventionally used as a circumferential surface to a non-circumferential surface, so that the time and effort of molding does not increase.

  The convex portion that prevents reverse assembly may have any desired value as long as the maximum diameter or the minimum diameter is a required value. It is sufficient that the number of convex portions is at least one, but it is preferable that a plurality of convex portions are provided at equal intervals so as to be easily pressed and not easily affected by distortion due to heat treatment, for example, every 90 °. Four are provided. The concave portion forming the lubricant flow path can be formed by reducing the diameter of the portion between the adjacent convex portions, and the shape thereof may be a curved surface or a flat surface. The amount of recess with respect to the convex portion of the recess can be adjusted so that the amount of penetrating oil becomes an appropriate amount, thereby further improving the lubricant penetrability.

  Specifically, the outer diameter portion of the inner race of the thrust roller bearing of the first invention and the inner diameter portion of the outer race of the thrust roller bearing of the second invention are generally square (each side is flat), and the corners thereof In the thrust roller bearing of the first invention, the corner portion is used as a convex portion of the outer diameter portion of the inner race (the flat portion is a concave portion), and the thrust roller bearing of the second invention is used. Then, what is necessary is just to use a corner | angular part as a recessed part (flat part is a convex part) of the internal diameter part of an outer race. The shape based on such a flat part is easy to press, and a flat part that fits into the flat part is provided on a mating member (an inner race support member or an outer race support member that is not a guide member). Therefore, it can be used for rotation prevention. The outer diameter portion of the inner race of the thrust roller bearing of the first invention and the inner diameter portion of the outer race of the thrust roller bearing of the second invention may be entirely oval, and in this case, In the thrust roller bearing, both end portions having a large curvature on both sides in the long axis direction are used as convex portions of the outer diameter portion of the inner race (the central portion having a small curvature is a concave portion). In the thrust roller bearing of the second invention, The central portion having a small curvature on both sides in the short axis direction may be used as a convex portion of the inner diameter portion of the outer race (both end portions in the long axis direction having a large curvature are concave portions).

  The shape of the cage is not particularly limited. For example, the cage may be composed of a pair of annular steel plates formed by press molding, or may be composed of a single annular steel plate molded by press molding. The cage made of one annular steel plate formed by press molding is preferably bent several times from the radially inner side to the outer side. In this case, the cage has a minimum diameter portion. In some cases, the bent portion may be fitted to the bent portion of the inner race.

  According to the thrust roller bearing of the present invention, reverse projection is prevented by the convex portion provided on the outer diameter portion of the inner race or the inner diameter portion of the outer race, and the passage amount of the lubricant reduced by the convex portion is ensured by the concave portion. Therefore, the lubricant penetrability that causes an increase in rotational torque does not decrease, and an increase in rotational torque can be prevented while preventing reverse assembly.

FIG. 1 is a longitudinal sectional view showing a first embodiment of a thrust roller bearing according to the present invention. FIG. 2 is a front view of the inner race of the thrust roller bearing of the first embodiment. FIG. 3 is a longitudinal sectional view showing a second embodiment of the thrust roller bearing according to the present invention. FIG. 4 is a front view of the outer race of the thrust roller bearing of the second embodiment.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 and 2 show a first embodiment of a thrust roller bearing of the present invention.

  The thrust roller bearing (10) has an inner race (12) formed in an annular shape and in contact with the end surface (1a) of the rotating shaft (1), and an end surface (1a) formed in an annular shape on the rotating shaft (1). An outer race (13) that abuts the inner surface (2a) of the parallel housing (2), etc., a plurality of needle rollers (14) disposed between both races (12) (13), and a plurality of needle rollers ( A retainer (15) for retaining 14).

  The inner race (12) is sometimes referred to as an L race. The inner race main body (21) orthogonal to the axis of the rotation shaft (1) (parallel to the end face (1a)) and the inner race main body (21 ), A short cylindrical bent part (22) extending from the inner diameter part toward the outer race (13) side, and a retainer retaining projection extending radially outward from the end of the bent part (22) ( 23).

  The outer race (13) is sometimes referred to as a J race, and is formed substantially symmetrically with respect to the inner race (12) with the needle rollers (14) in between, and is orthogonal to the axis of the rotating shaft (1) ( An outer race main body (24) parallel to the end face (1a), a short cylindrical bent portion (25) extending from the outer diameter of the outer race main body (24) toward the inner race (12), It consists of a protrusion (26) for retaining the retainer extending radially inward from the end of the bent portion (25).

  The outer diameter portion of the inner race (12) has conventionally been a circumferential surface, whereas four circular arc surfaces (27) constituting a part of the same circumferential surface and arranged at equal intervals in the circumferential direction. ) And a flat surface (28) connecting these arc surfaces (27) to each other. The outer diameter of the circumferential surface on which the four arc surfaces (27) are based is larger than the outer diameter of the bent portion (25) of the outer race (13). The flat surface (28) is formed by cutting out the circumferential surface on which the four arc surfaces (27) are based so as to leave the four arc surfaces (27). The outer diameter of the most recessed part (28a) is smaller than the inner diameter of the bent part (25) of the outer race (13). Accordingly, the outer diameter portion of the inner race (12) has four convex portions = arc surfaces (27) whose maximum diameter portion is located radially outward from the outer diameter of the bent portion (25) of the outer race (13). ) And four concave portions (28) in which the smallest diameter portion (28a) is located radially inward from the inner diameter of the bent portion (25) of the outer race (13).

  The inner race (12) and the outer race (13) are integrally formed by press forming a steel plate.

  Each needle roller (14) is arranged radially around the center of the bearing and is held in the pocket (34) of the cage (15) so as not to slip out on both sides in the axial direction. (12) and the outer race (13) are brought into contact with the inner surfaces of the main body portions (21) and (24).

  The cage (15) is an integrally processed product by stamping and press forming using a thin steel plate as a raw material, an inner diameter side annular plate (31), an outer diameter side annular plate (32), and both the annular plates (31). A plurality of pillars (33) spanned at a predetermined interval in the circumferential direction of (32), and a plurality of pockets (34) formed between these neighboring pillars (33). Yes. The cage (15) is bent a plurality of times in the radial direction, whereby each pillar portion (33) is formed in a substantially M-shaped cross section.

  The inner race (12) and the outer race (13) are formed so that the protrusion (23) of the inner race (12) is not in contact with the outer race main body (24), and the protrusion (26) of the outer race (13) It is assembled via a cage (15) so as not to contact the inner race body (21). The outer diameter of the projection (23) of the inner race (12) is larger than the inner diameter of the bent portion (31a) of the inner diameter side annular plate (31) of the cage (15), and the outer race (13) The inner diameter of the protrusion (26) is smaller than the outer diameter of the outer diameter side annular plate (32) of the retainer (15), so that the retainer (15) and each race (12) (13) Is not possible to separate in the axial direction.

  According to this thrust roller bearing (10), the needle roller (14) and each race main body (21) (24) can support the load in the axial direction of the rotating shaft (1). When the race (12) and the outer race (13) rotate relative to each other, the needle rollers (14) rotate and the frictional resistance against the rotating shaft (1) is reduced.

  As shown in FIG. 1, the thrust roller bearing (10) is used in an outer race guide in which a bent portion (25) of an outer race (13) is guided to a cylindrical inner peripheral surface (2b) such as a housing (2). Thus, the inner diameter side of the bent portion (22) of the inner race (12) is a space. Lubricating oil supplied to the end of the rotating shaft (1) is lubricated between the bent part (22) of the inner race (12) and the inner diameter part of the outer race (13). The lubricating oil is supplied to the inside and discharged from between the outer diameter portion of the inner race (12) and the bent portion (25) of the outer race (13).

  According to the thrust roller bearing (10), the outer diameter portion of the inner race (12) has a maximum diameter portion that is positioned radially outward from the outer diameter of the bent portion (25) of the outer race (13). By providing four convex portions = arc surface (27) to prevent assembly, the outer diameter portion of the inner race (12) cannot be fitted to the inner peripheral surface (2b) of the housing (2). As a result, reverse assembly is prevented.

  Further, the concave portion of the outer diameter portion of the inner race (12) = flat surface (28) is such that the four convex portions = the arc surface (27) are bent between the outer diameter portion of the inner race (12) and the outer race (13). Since the lubricant flow path (P) between the flat surface (25) and the flat surface (28) is reduced, the lubricant flow passage (P) is narrowed. Since the outer diameter of the most concave portion (minimum diameter portion) (28a) is smaller than the inner diameter of the bent portion (25) of the outer race (13), this lubricant flow passage (P) portion The passage amount of the lubricant is ensured, and the decrease in the lubricant discharge amount (decrease in the lubricant penetrability) that causes the increase in the rotational torque is prevented from occurring.

  As a result, according to the thrust roller bearing (10), it is possible to prevent an increase in rotational torque while preventing reverse assembly.

  3 and 4 show a second embodiment of the thrust roller bearing of the present invention.

  The thrust roller bearing (11) of the second embodiment is used in the inner race guide, whereas the thrust roller bearing (10) of the first embodiment is used in the outer race guide. The same reference numerals are given to the same components as those in the first embodiment, and the description thereof will be omitted, and only the differences will be described.

  The thrust roller bearing (11) of this embodiment is configured such that the bent portion (22) of the inner race (12) is fitted to the small-diameter shaft portion (not shown) of the rotating shaft, and the outer race (13) The outer diameter side of the bent portion (25) is used in an inner race guide that is a space.

  Whereas the inner diameter portion of the outer race (13) has conventionally been a circumferential surface, the four flat surfaces (29a), which are part of the circumferential surface having a square cross section, and these flat surfaces (29a) And an arcuate surface (30) connecting the two. The inner diameter of the square (the diameter of the inscribed circle) on which the four flat surfaces (29a) are based is smaller than the inner diameter of the bent portion (22) of the inner race (12). The arc surface (30) has an outer diameter smaller than the square outer diameter (diameter of the circumscribed circle), but the inner race (12) is bent ( 22) It is assumed to be larger than the outer diameter. As a result, a shape in which the flat surface (29a) protrudes inward with respect to the circumferential surface indicated by a two-dot chain line in FIG. 4 is obtained, and the inner diameter portion of the outer race (13) has a minimum diameter portion as an inner race. (12) Folded part (22) Four convex parts (29) located radially inward from the inner diameter and the largest diameter part in the inner race (12) bent part (22) inner diameter than the inner diameter Four recesses (30) located outward are provided.

  According to the thrust roller bearing (11) of the second embodiment, the inner diameter portion of the outer race (13) has a minimum diameter portion positioned radially inward from the inner diameter of the bent portion (22) of the inner race (12). Since the four convex portions (29) (flat surface (29a)) are provided, the inner diameter portion of the outer race (13) cannot be fitted to the small diameter shaft portion of the rotating shaft (2). Therefore, reverse assembly is prevented.

  Further, the concave portion of the inner race portion of the outer race (13) = arc surface (30) is such that the four convex portions (29) are formed between the inner race portion of the outer race (13) and the bent portion (22) of the inner race (12). Since the lubricant flow passage (P) in between is narrowed, this is to compensate for the decrease in the amount of lubricating oil passing therethrough, and the concave portion = the circle on which the arc surface (30) is based Since the outer diameter of the peripheral surface is smaller than the inner diameter of the bent portion (22) of the inner race (12), the amount of lubricant passing through the lubricant flow passage (P) is ensured, and the rotation A decrease in lubricant discharge amount (a decrease in lubricant penetrability), which causes an increase in torque, is prevented from occurring.

  As a result, according to this thrust roller bearing (11), it is possible to prevent an increase in rotational torque while preventing reverse assembly.

  In the first embodiment, the outer race (13) may have a portion larger than the outer diameter of the bent portion (25) in the outer diameter portion of the inner race (12). The shape of the recess can be variously changed. In the second embodiment, the inner race (12) may have only one portion located radially inward from the inner diameter of the bent portion (22) of the inner race (12). The shape of the convex part and the concave part can be variously changed.

(10) (11) Thrust roller bearing
(12) Inner race
(13) Outer race
(14) Needle roller
(15) Cage
(22) Bending part
(27) Arc surface (convex)
(28) Flat surface (concave)
(29) Convex
(30) Arc surface (concave)
(P) Lubricant flow path

Claims (2)

An inner race and an outer race both formed in an annular shape, a plurality of rollers arranged between both races, and a cage for holding the plurality of rollers, are provided in a short cylindrical shape provided in the inner race inner diameter portion. Both the race and the retainer are fitted by fitting the bent portion and the inner diameter portion of the cage together with the short cylindrical bent portion provided on the outer diameter portion of the outer race and the outer diameter portion of the cage. In a thrust roller bearing in which the outer race is used by being fitted into the outer race guide member.
At the outer diameter of the inner race, at least one convex portion that prevents the reverse assembly by positioning the maximum diameter portion radially outward from the outer diameter of the outer race bent portion, and the minimum diameter portion of the outer race bent portion. A thrust roller bearing comprising: at least one concave portion that is located radially inward of the inner diameter and that forms a lubricant flow path between the outer race and a bent portion of the outer race. An inner race and an outer race both formed in an annular shape, a plurality of rollers arranged between both races, and a cage for holding the plurality of rollers, are provided in a short cylindrical shape provided in the inner race inner diameter portion. Both the race and the retainer are fitted by fitting the bent part and the inner diameter part of the cage together with the short cylindrical bent part provided on the outer diameter part of the outer race and the outer diameter part of the cage. Is a thrust roller bearing used in which the inner race is fitted into the inner race guide member.
At least one convex portion that prevents the reverse assembly by positioning the inner diameter portion of the outer race in the radial direction with respect to the inner diameter of the bent portion of the inner race, and the largest diameter portion outside the bent portion of the inner race. A thrust roller bearing comprising: at least one concave portion that is located radially outward from the diameter and that forms a lubricant flow path between the inner race and a bent portion.

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