JP2008121743A - Conical bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conical bearing which can make a load capacity equal or larger while being made compact in size. <P>SOLUTION: The conical bearing comprises: an inner ring 11; an outer ring 12; a plurality of conical rollers 13 arranged between the inner ring 11 and the outer ring 12 so as to freely be turnable; and a cage 14 for holding the conical rollers 13 at prescribed circumferential intervals. The small-diameter face 13a and the large-diameter face 13b of the conical roller 13 are reessed each. The cage 14 comprises a small-diameter side annular body 15 having a protrusion 25 which is engaged with the recess 23 of the small-diameter face 13a of the conical roller 13, and a large-diameter side annular body 16 having a protrusion 26 which is engaged with the recess 24 of the large-diameter face 13b of the conical roller 13. The small-diameter side annular body 15 and the large-diameter side annular body 16 are connected to each other by using poles 17 smaller than the arranged conical rollers 13 in number. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a tapered roller bearing, and more particularly to a tapered roller bearing used in a vehicle (automobile) or the like.

  As shown in FIG. 4, the tapered roller bearing includes an inner ring 1 having a conical raceway surface 1 a on the outer peripheral surface, an outer ring 2 having a conical raceway surface 2 a on the inner peripheral surface, and a raceway surface 1 a of the inner ring 1. A plurality of tapered rollers 3 that are arranged so as to roll freely between the raceway surface 2a of the outer ring 2 and a retainer 4 that holds the tapered rollers 3 at equal circumferential intervals are provided.

  In this tapered roller bearing, the roller 3 and the raceway surfaces 1a and 2a of the inner and outer rings 1 and 2 are in line contact, and the inner and outer ring raceway surfaces and the roller center O are at one point (not shown) on the axis P. Designed to match. When a load is applied, the roller 3 is pressed to the large end side (large diameter surface 3a side). Therefore, in order to receive this load, the outer periphery of the inner ring 1 on the roller large end side has a flange (large ) 9a is provided. Further, in order to prevent the roller from dropping off to the small end before the bearing is assembled in a machine or the like, a collar (small collar) 9b is provided on the outer periphery of the inner ring on the roller small end side.

  As shown in FIG. 5, the retainer 4 includes a small-diameter side annular body 5, a large-diameter side annular body 6, and a column 7 that connects both the annular bodies 5 and 6. That is, the pocket 8 in which the tapered roller 3 is accommodated is formed between the columns 7 and 7 adjacent in the circumferential direction. The small-diameter-side annular body 5 includes a ring-shaped radial wall portion 5a and a peripheral wall 5b extending from the radial wall portion 5a so as to increase in diameter toward the large-diameter-side annular body 6 side.

  In recent years, with the expansion of the interior space of automobiles, reduction of the engine room, higher output of the engine, and multistage transmission for improving fuel efficiency have been promoted. For this reason, tapered roller bearings used therein are required to have a load capacity that is equal to or greater than that of conventional ones, and are required to be compact.

  By the way, in order to make the load capacity equal to or more than compact, there are methods such as increasing the roller length, increasing the roller diameter, and increasing the number of rollers. However, in this type of tapered roller bearing, as shown in FIG. 4, the inner ring 1 has flanges 9a and 9b, and a column 7 is disposed between the rollers. It was difficult to make it equal or better.

Therefore, there is a conventional structure in which one of the flanges 9b of the inner ring 1 can be omitted (Patent Document 1). That is, by reducing the flange 9b of the inner ring 1, the tapered roller bearing is reduced in weight and size.
JP 2002-54638 A

  However, even if the flange 9b of the inner ring 1 is omitted, the roller diameter cannot be increased and the number of rollers cannot be increased. It is possible to increase the roller length by omitting the flange 9b of the inner ring 1. However, when the roller length is increased, the cage 4 that houses the tapered rollers is enlarged, and the small-diameter annular body 5 protrudes from the back surface 10 of the outer ring 2. For this reason, depending on the position where this tapered roller bearing is installed, there may be a problem of interference with peripheral parts of the small-diameter side annular body 5.

  Therefore, in the past, it has been extremely difficult to make the load capacity equal to or greater than that of a compact size.

  In view of the above problems, the present invention provides a tapered roller bearing that can be made compact and can have a load capacity equal to or greater than that.

  A tapered roller bearing according to the present invention includes an inner ring, an outer ring, a plurality of tapered rollers arranged to roll between the inner ring and the outer ring, and a cage that holds the tapered rollers at a predetermined circumferential interval. In the tapered roller bearing provided, a concave portion is provided on each of the small diameter surface and the large diameter surface of the tapered roller, and the cage includes a small diameter side annular body having a convex portion that engages with the concave portion of the small diameter surface of the tapered roller; A large-diameter-side annular body having a convex portion that engages with a concave portion of a large-diameter surface of the tapered roller, and the smaller-diameter-side annular body and the large-diameter-side annular body are formed into a smaller number of columns than the tapered rollers to be arranged. Connected.

  According to the tapered roller bearing of the present invention, the convex portion of the small-diameter side annular body engages with the concave portion of the small-diameter surface of the roller, and the convex portion of the large-diameter side annular body engages with the concave portion of the large-diameter surface of the roller. Each roller is held by a cage. For this reason, it is not necessary to sandwich each roller with a pillar, and the number of pillars can be made smaller than that of a tapered roller.

  Moreover, since it can be set as the assembly body which assembled | attached the roller and the holder | retainer, a collar part can be abbreviate | omitted on the small diameter side of the inner ring | wheel which prevents the roller from detaching.

  The cage may be made of iron plate or resin.

  In the tapered roller bearing of the present invention, the number of columns can be reduced as compared with a tapered roller. Therefore, the number of rollers can be increased or the roller diameter can be increased without increasing the outer shape of the tapered roller bearing. it can. For this reason, the load capacity can be made equal to or more than compact, interference with surrounding parts is not a major problem, and the installation position (mounting position) regulation of this tapered roller bearing can be reduced, and installation ( Mounting) can be facilitated.

  Further, since the flange portion can be omitted on the small diameter side of the inner ring that prevents the rollers from coming off, it is possible to reduce the size and weight.

  By making the cage into an iron plate, the rigidity of the cage can be increased and the rollers can be stably held over a long period of time. Moreover, it is excellent in oil resistance and can prevent material deterioration due to immersion in oil. If the cage is made of resin, it is light in weight and has a small coefficient of friction, which is suitable for reducing torque loss and cage wear when starting the bearing. In particular, since the resin cage can be formed by injection molding, there is an advantage that even a cage having a unique shape can be easily manufactured.

  An embodiment of a tapered roller bearing according to the present invention will be described with reference to FIGS.

  FIG. 1 shows a simplified plan view of a retainer of a tapered roller bearing, FIG. 2 shows a side view of an essential part of the retainer, and FIG. 3 shows an enlarged sectional view of an essential part of the tapered roller bearing. This tapered roller bearing includes an inner ring 11 having a conical raceway surface 11 a on the outer peripheral surface, an outer ring 12 having a conical raceway surface 12 a on the inner peripheral surface, a raceway surface 11 a of the inner ring 11, and a raceway surface of the outer ring 12. A plurality of tapered rollers 13 disposed so as to be freely rollable between the roller 12a and a retainer 14 for holding the tapered rollers 13 at equal circumferential intervals.

  The inner ring 11 is provided with a flange portion 21 extending in the outer diameter direction on the large diameter side of the raceway surface 11a, and a corner portion 22 between the flange portion 21 and the raceway surface 11a. The inner ring 11 is not provided with a flange on the small diameter side of the raceway surface 11a. Further, the outer ring 12 is not provided with a flange or the like on the large diameter side and the small diameter side of the raceway surface 12a.

  The tapered roller 13 is provided with recesses 23 and 24 on the small diameter surface 13a and the large diameter surface 13b, respectively. In this case, each recessed part 23 and 24 consists of a hemispherical recessed part, and is provided in the center part of the small diameter surface 13a and the large diameter surface 13b, respectively.

  As shown in FIGS. 1 and 2, the retainer 14 includes a small-diameter side annular body 15, a large-diameter side annular body 16, and a column 17 that connects both the annular bodies 15 and 16. The small-diameter-side annular body 15 is provided with a convex portion (projection) 25 facing the large-diameter-side annular body 16, and the large-diameter-side annular body 16 has a small-diameter side corresponding to the convex portion (protrusion) 25. A convex portion (projecting portion) 26 facing the annular body 15 is provided.

  The convex portions (protrusions) 25 and 26 have a semi-circular cross section, and the curvature radius R1 of the outer surface is set smaller than the curvature radius R of the concave portions 23 and 24 of the tapered roller 13, and the convex portions 25 and 26 The contact with the inner surfaces of the recesses 23 and 24 is a point contact.

  Moreover, the convex parts 25 and 26 are arrange | positioned according to the number of the rollers 13 each arrange | positioned. Therefore, in each tapered roller 13, the convex portion 25 of the small diameter side annular body 15 is engaged with the concave portion 23 of the small diameter surface 13a, and the convex portion 26 of the large diameter side annular body 16 is engaged with the concave portion 24 of the large diameter surface 13b. Engage. Thereby, each tapered roller 13 is held by the cage 14.

  By the way, since the 16 tapered rollers 13 are disposed in the retainer 14, the convex portions 25 and 26 are disposed at a pitch of 22.5 degrees in the circumferential direction, respectively. Therefore, in the illustrated example, as shown in FIG. 1, only the columns 17 sandwiching the rollers 13 held by 26A, 26B, 26C, and 26D arranged at a pitch of 90 degrees along the circumferential direction are arranged. That is, four annular body connecting columns 19 including a pair of columns 17 forming a pocket 18 for accommodating the tapered rollers 13 are provided at a pitch of 90 degrees along the circumferential direction. A large pocket 27 for accommodating three tapered rollers is provided between the annular connecting columns 19.

  The cage 14 is formed, for example, by press-molding a metal plate into a truncated trapezoidal shape and then press punching the pockets 18 and 27. As the metal plate, rolled steel plate such as cold rolled steel plate (SPC) and hot rolled mild steel plate (SPH), spring steel, and the like can be used. In the case of a cold rolled steel plate (SPC) or a hot rolled mild steel plate (SPH), it is preferable to subject the surface to surface hardening treatment such as carbonitriding treatment or gas soft nitriding treatment.

  Here, carbonitriding is a method in which nitriding is performed at the same time as carburizing, in which carbon C and nitrogen N are diffused. For example, ammonia (NH 3) (0. For example, at about 850 ° C. The gas soft nitriding treatment is a method in which soft nitriding is performed with a gas, and there are a method in which ammonia gas and a carburizing gas are mixed and a method in which urea is decomposed. Soft nitriding using a mixture of ammonia gas and carburizing gas in a ratio of 1: 1 is the mainstream of gas soft nitriding.

  Further, the retainer 14 may be made of resin, that is, engineering plastic, instead of an iron plate. Here, the engineering plastic is an abbreviation for engineering plastics, which is excellent in heat resistance among synthetic resins and can be used in fields where strength is required. Engineering plastics include general-purpose engineering plastics and super engineering plastics. The engineering plastics used for the cage 14 include both. The following are typical examples. These are examples of engineering plastics, and engineering plastics are not limited to the following. Moreover, in this resin holder | retainer 14, it can form by injection molding, for example.

  General-purpose engineering plastics include polycarbonate (PC), polyamide 6 (PA6), polyamide 66 (PA66), polyacetal (POM), modified polyphenylene ether (m-PPE), polybutylene terephthalate (PBT), and GF reinforced polyethylene terephthalate (GF). -PET), ultra high molecular weight polyethylene (UHMW-PE) and the like. Super engineering plastics include polysulfone (PSF), polyethersulfone (PES), polyphenylene sulfide (PPS), polyarylate (PAR), polyamideimide (PAI), polyetherimide (PEI), polyetheretherketone. (PEEK), liquid crystal polymer (LCP), thermoplastic polyimide (TPI), polybenzimidazole (PBI), polymethylbenten (TPX), poly 1,4-cyclohexanedimethylene terephthalate (PCT), polyamide 46 (PA46), There are polyamide 6T (PA6T), polyamide 9T (PA9T), polyamide 11,12 (PA11,12), fluororesin, polyphthalamide (PPA) and the like.

  According to the tapered roller bearing of the present invention, the convex portion 25 of the small diameter side annular body 15 engages with the concave portion 23 of the small diameter surface 13 a of the tapered roller 13, and the large diameter side of the concave portion 24 of the large diameter surface 13 b of the tapered roller 13. Since the convex portions 26 of the annular body 16 are engaged, each tapered roller 13 is held by the cage 14. For this reason, it is not necessary to sandwich the tapered rollers 13 with the pillars 17, and the number of the pillars 17 can be smaller than that of the tapered rollers 13. Can be increased. That is, it is possible to make the load capacity equal to or greater than the compact size.

  Moreover, since it can be set as the assembly body which assembled | attached the tapered roller 13 and the holder | retainer 14, a collar part can be abbreviate | omitted on the small diameter side of the inner ring | wheel 11 which prevents the roller 13 from detaching, and compactness and weight reduction are achieved. Can be planned.

  By making the cage 14 made of iron plate, the rigidity of the cage 14 can be increased, and the rollers can be stably held over a long period of time. Moreover, it is excellent in oil resistance and can prevent material deterioration due to immersion in oil. If the cage 14 is made of resin, the weight is light and the coefficient of friction is small, which is suitable for reducing torque loss and cage wear when starting the bearing. In particular, since the resin cage can be formed by injection molding, there is an advantage that even a cage having a unique shape can be easily manufactured.

  As described above, the embodiments of the present invention have been described. However, the present invention is not limited to the above-described embodiments, and various modifications are possible. For example, the number of pillars 17 of the cage 14 can be increased or decreased. The number of tapered rollers 13 to be arranged is also arbitrary. That is, it is only necessary to connect the small-diameter side annular body 15 and the large-diameter side annular body 16 with a smaller number of columns 17 than the tapered rollers 13 arranged. The shape and size of the recesses 23 and 24 formed on the small diameter surface 13a and the large diameter surface 13b of the tapered roller 13 are the same as the shape of the protrusions 25 and 26 on the cage side that engage with the recesses 23 and 24. Various changes can be made according to the size and the like. That is, the concave portions 23 and 24 and the convex portions 25 and 26 can be engaged with each other so that the tapered rollers 13 can be held by the cage 14, and the tapered rollers 13 do not hinder rolling. In addition, you may use what mix | blended glass fiber or carbon fiber, etc. with these resin materials or other engineering plastics for the intensity | strength enhancement as the holder | retainer 14. FIG.

It is a simplified top view of the retainer of the tapered roller bearing which shows the embodiment of the present invention. It is a principal part side view of the holder | retainer of the said tapered roller bearing. It is a principal part expanded sectional view of the said tapered roller bearing. It is sectional drawing of the conventional tapered roller bearing. It is a perspective view of the conventional tapered roller holder.

Explanation of symbols

11 Inner ring 12 Outer ring 13 Tapered roller 13a Small-diameter surface 13b Large-diameter surface 14 Cage 15 Small-diameter side annular body 16 Large-diameter-side annular body 17 Columns 23, 24 Concave portions 25, 26 Convex portions

Claims (3)

In a tapered roller bearing comprising an inner ring, an outer ring, a plurality of tapered rollers arranged to roll between the inner ring and the outer ring, and a retainer for holding the tapered rollers at a predetermined circumferential interval,
Recesses are provided on the small diameter surface and the large diameter surface of the tapered roller, respectively, and the cage includes a small diameter side annular body having a convex portion engaged with the concave portion of the small diameter surface of the tapered roller, and a large diameter surface of the tapered roller. A large-diameter-side annular body having a convex portion that engages with the concave portion, and the small-diameter-side annular body and the large-diameter-side annular body are connected by a smaller number of columns than the tapered rollers that are arranged. Tapered roller bearing.   2. The tapered roller bearing according to claim 1, wherein the cage is made of an iron plate.   2. The tapered roller bearing according to claim 1, wherein the cage is made of resin.

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