Abstract:
An end bearing, a one-way clutch device and a method of manufacturing the end bearing, capable of preventing abrasion or scorching of the end bearing while improving the productivity. The annular end bearing which is interposed between an inner race and an outer race of the one-way clutch device and is in a slidable contact with the inner race or the outer race when it is operated, wherein a recess having the depth of 5 to 30 μm is formed on a slidable contact surface with inner race or the outer race. The method comprises a blanking step of blanking an annular blank from a metal plate, a recess forming step of forming a recess in a predetermined portion of said blank, and a drawing step of forming a flange on said blank by drawing, wherein the above recess forming step is executed before or after the blanking step, or at the same time with the blanking step.

Description:
[0001]    This application claims the benefit of Japanese Patent application No. 2001-040423 which is hereby incorporated by reference.  
         BACKGROUND OF THE INVENTION  
         [0002]    1. Field of the Invention  
           [0003]    The present invention relates to a one-way clutch device for constituting an automatic transmission or the like for vehicles, an end bearing for constituting the one-way clutch device, and a method of manufacturing such an end bearing.  
           [0004]    2. Related Background Art  
           [0005]    An automatic transmission for vehicles is generally provided with a planetary gear transmission mechanism of three-speed to five-speed or around, in addition to a torque converter serving as a fluid coupling, and is adapted to change the speed by properly fixing or releasing the constituent elements (such as a sun gear or a planetary gear) of the planetary gear transmission mechanism by means of frictional engaging means such as a clutch or a brake. As such a frictional engaging means to be provided inside the automatic transmission, there is employed a multiple disc wet clutch which has friction plates and separator plates alternately disposed thereon, with the exception of band brakes of a specific type. For pressure contact (frictional engagement) between the both plates, pressure oil from a transmission control oil pressure circuit is employed. Also, some automatic transmissions employ, as such frictional engagement means, the one which incorporates therein a one-way clutch device to freely rotate a gear shaft, or the like, in one direction of rotation, thereby realizing easier transmission control.  
           [0006]    In a one-way clutch device, normally an annular end bearing for regulating the movement of the clutch constituent elements, such as a sprag, is interposed between an inner race and an outer race, in order to secure an action of the constituent elements. In the one-way clutch device, either one of the inner race and the outer race is fixed and the other is rotated, so that the end bearing is brought into slidable contact with the inner race or the outer race. Then, in the one-way clutch device with, for instance, the fixed inner race, lubrication using centrifugal force can not be conducted for the one-way clutch mechanism, so that lubricating oil is supplied with pressure by a forcible lubricating means, such as a pressure pump, to an oil path formed on the inner race. The supplied lubricating oil flows out through a gap between the end bearing and the inner race after lubricating or cooling the sprag, or the like, through the oil path.  
           [0007]    In a one-way clutch device of this type, the end bearing works to secure an action of the sprag, as described above. However, in a relative rotation between the inner race and the outer race (i.e., in an operation of the automatic transmission, or the like), the end bearing is always in slidable contact with the outer peripheral surface of the inner race, irrespective of an operational state of the one-way clutch mechanism. For this reason, if the lubricating oil is not supplied appropriately into the gap between the inner race and the end bearing, the slide surface may be worn away to an impermissible extent, or the frictional heat may be accumulated to scorch the slide surface.  
           [0008]    Accordingly, as shown in FIG. 27, some of conventional one-way clutch devices employ such a structure that spiral oil grooves  71  are formed on the inner peripheral surface of an end bearing  21 , thereby realizing smooth supply of lubricating oil. However, though lubrication can be satisfactorily conducted even with the end bearing  21  shown in FIG. 27, problems as described below may occur in this case. Specifically, since the contact facial pressure around the oil grooves  71  locally rises on the slide surface of the end bearing  21 , it is inevitable that the end bearing  21  is abraded further in driving for a long time. The abrasion of the end bearing  21  becomes a factor for impeding a proper performance of a cage, and for mixing abrasion powder into transmission oil.  
         SUMMARY OF THE INVENTION  
         [0009]    The present invention is contrived considering the above circumstances, and an object thereof is to provide a one-way clutch device and a method of manufacturing an end bearing, capable of preventing abrasion or scorching of the end bearing while improving the productivity.  
           [0010]    In order to solve the above problems, according to the present invention, there is proposed an annular end bearing which is interposed between an inner race and an outer race of a one-way clutch device and is in a slidable contact with the inner race or the outer race when it is operated, wherein a recess having the depth of 5 to 30 μm is formed on a slidable contact surface with inner race or the outer race.  
           [0011]    Also, in the end bearing of the present invention, said recess is preferably formed by a circumferential groove, a spiral groove, or a dimple, or a combination thereof.  
           [0012]    Also, in the end bearing of the present invention, it is preferable that a flange is formed on at least one of the inner periphery and the outer periphery thereof by plastic working of a metal plate, and said recess is also formed by plastic working.  
           [0013]    It is also preferable that the end bearing of the present invention is interposed between the inner race and the outer race.  
           [0014]    According to the present invention, there is also provided a method of manufacturing an end bearing which is interposed between an inner race and an outer race of a one-way clutch device, which method comprises a blanking step of blanking an annular blank from a metal plate, a recess forming step of forming a recess in a predetermined portion of said blank, and a drawing step of forming a flange on said blank by drawing, wherein the above recess forming step is executed before or after the blanking step, or at the same time with the blanking step.  
           [0015]    Also, according to the present invention, there is proposed a method of manufacturing an end bearing which is interposed between an inner race and an outer race of a one-way clutch device, which method comprises a blanking step of blanking an annular blank out of a metal plate material, a recess forming step of forming a recess in a predetermined portion of said blank, and a drawing step of forming a flange on said blank by drawing, wherein the above recess forming step is executed at the same time with the drawing step.  
           [0016]    Also, in the method of manufacturing an end bearing of the present invention, it is preferable that the recess forming step is for forming said recess by plastic working. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0017]    [0017]FIG. 1 is a longitudinal cross-sectional view for showing the essential portion of a one-way clutch device according to an embodiment of the present invention;  
         [0018]    [0018]FIG. 2 is a longitudinal cross-sectional view for showing the essential portion of an end bearing according to the embodiment in an enlarged manner;  
         [0019]    [0019]FIG. 3 is a view for showing a recess formed on an inner flange of the end bearing;  
         [0020]    [0020]FIG. 4 is a view for showing a recess formed on the inner flange of the end bearing;  
         [0021]    [0021]FIG. 5 is a view for showing a recess formed on the inner flange of the end bearing;  
         [0022]    [0022]FIG. 6 is a view for showing a recess formed on the inner flange of the end bearing;  
         [0023]    [0023]FIG. 7 is a view for showing a recess formed on the inner flange of the end bearing;  
         [0024]    [0024]FIG. 8 is a view for showing a recess formed on the inner flange of the end bearing;  
         [0025]    [0025]FIG. 9 is a view for showing a recess formed on the inner flange of the end bearing;  
         [0026]    [0026]FIG. 10 is a view for showing a recess formed on the inner flange of the end bearing;  
         [0027]    [0027]FIGS. 11A to  11 D represent views for explaining a first embodiment of a method of manufacturing the end bearing;  
         [0028]    [0028]FIGS. 12A to  12 C represent views for explaining a second embodiment of the method of manufacturing the end bearing;  
         [0029]    [0029]FIGS. 13A to  13 D represent views for explaining a third embodiment of the method of manufacturing the end bearing;  
         [0030]    [0030]FIGS. 14A to  14 E represent views for explaining a fourth embodiment of the method of manufacturing the end bearing;  
         [0031]    [0031]FIGS. 15A to  15 F represent views for explaining a fifth embodiment of the method of manufacturing the end bearing;  
         [0032]    [0032]FIGS. 16A to  16 D represent views for explaining a sixth embodiment of the method of manufacturing the end bearing;  
         [0033]    [0033]FIGS. 17A to  17 E represent views for explaining a seventh embodiment of the method of manufacturing the end bearing;  
         [0034]    [0034]FIGS. 18A to  18 E represent views for explaining an eighth embodiment of the method of manufacturing the end bearing;  
         [0035]    [0035]FIGS. 19A to  19 F represent views for explaining a ninth embodiment of the method of manufacturing the end bearing;  
         [0036]    [0036]FIGS. 20A to  20 F represent views for explaining a tenth embodiment of the method of manufacturing the end bearing;  
         [0037]    [0037]FIGS. 21A to  21 F represent views for explaining an eleventh embodiment of the method of manufacturing the end bearing;  
         [0038]    [0038]FIGS. 22A to  22 E represent views for explaining a twelfth embodiment of the method of manufacturing the end bearing;  
         [0039]    [0039]FIGS. 23A to  23 F represent views for explaining a thirteenth embodiment of the method of manufacturing the end bearing;  
         [0040]    [0040]FIGS. 24A to  24 E represent views for explaining a fourteenth embodiment of the method of manufacturing the end bearing;  
         [0041]    [0041]FIGS. 25A to  25 E represent views for explaining a fifteenth embodiment of the method of manufacturing the end bearing;  
         [0042]    [0042]FIGS. 26A to  26 F represent views for explaining a sixteenth embodiment of the method of manufacturing the end bearing; and  
         [0043]    [0043]FIG. 27 is a longitudinal cross-sectional view for showing a conventional end bearing. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0044]    Detailed description will be made below on embodiments of a one-way clutch device and an end bearing and embodiments of a method of manufacturing the end bearing according to the present invention, with reference to the drawings.  
         [0045]    [0045]FIG. 1 is a longitudinal cross-sectional view for showing an embodiment of a one-way clutch device of the present invention. The one-way clutch device of the present embodiment is built in a multiple disc wet clutch of an automatic transmission which, however, has no relation to the gist of the present invention, so that description on the multiple disc wet clutch will be omitted.  
         [0046]    The one-way clutch device  1  is comprised of an inner race  5  on which an oil path  3  is formed to open on the outer peripheral surface thereof, an outer race  9  which is supported coaxially and relatively rotatably with respect to this inner race  5 , a one-way clutch mechanism  11  interposed between the inner race  5  and the outer race  9 , and the like. The one-way clutch mechanism  11  is comprised of a large number of sprags  13  serving as torque transmission members, a ribbon spring  15  for retaining the sprags  13  and, at the same time, for biasing the sprags in the direction of engagement, an outer cage  17  for annularly holding the ribbon spring  15 , an inner cage  19  for suppressing an excessive inclination of the sprags  13  together with the outer cage  17 , a pair of annular end bearings  21  for maintaining the both cages  17  and  19  with a predetermined interval to secure an action of the sprags  13 , and the like.  
         [0047]    In this one-way clutch device  1 , while the inner race  5  is fixed, the outer race  9  is rotated, whereby the one-way clutch mechanism  11  is rotated integrally with the outer race. In FIG. 1, reference numeral  23  denotes retainers which are mounted on the outer race  9  for limiting an axial movement of the end bearings  21 , while reference numeral  25  denotes thrust washers each interposed between the retainer  23  and a member to be retained.  
         [0048]    In this one-way clutch device  1 , lubrication using centrifugal force can not be conducted since the inner race  5  is fixed, so that lubricating oil is supplied with pressure to an oil path  3  of the inner race  5  by means of a forcible lubrication means such as a pressure pump. As indicated by the arrow in FIG. 1, the lubricating oil supplied from the inner peripheral side of the inner race  5  flows into the inner peripheral side of the sprags  13  through the oil path  3 , and then flows out through a gap between the end bearings  21  and the inner race  5 . Then, since the sprags  13  and the end bearings  21  are rotated integrally with the outer race  9 , slide surfaces between these members and the inner race  5  are lubricated by the supplied lubricating oil.  
         [0049]    [0049]FIG. 2 is a longitudinal cross-sectional view for showing the essential portion of the end bearing  21  in an enlarged manner. As shown in FIG. 2, the end bearing  21  is plastically formed of a phosphor bronze plate to have a cross section substantially in a U shape, in which an inner flange  33  and an outer flange  35  are extended on the inner and outer peripheries of an annular web  31 . On the inner peripheral surface of the inner flange  33 , there are formed a large number of small circumferential grooves  41  having the depth of 5 to 30 μm, as recesses. Note that though, for simplifying the description, the circumferential grooves  41  are shown in an exaggerated (enlarged) manner in FIG. 2, the actual depth and the width of the grooves are extremely small and the actual number of the grooves are far more than that shown in the figure.  
         [0050]    In the one-way clutch device  1  of the present embodiment, since a large number of the small circumferential grooves  41  are provided on the inner peripheral surface of the inner flange  33  of the end bearing  21 , the lubricating oil supplied through the oil path  3  of the inner race  5  advances into these circumferential grooves  41  and is retained therein, so that lubrication between the inner race  5  and the end bearing  21  is conducted with most satisfaction. Moreover, the contact facial pressure does nor rise locally between the inner race  5  and the end bearing  21 , so that the end bearing  21  is hardly abraded even with a long-term driving. As a result, there arises no such inconveniences as that the sprags  13  are prevented from properly being held by the both cages  17  and  19 , or abrasion powder from the end bearings  21  is mixed into the transmission oil.  
         [0051]    [0051]FIGS. 3 through 10 show examples of a recess to be formed on the inner flange  33  of the end bearing  21 . The depth of all these recesses is in a range from 5 to 30 μm, and the action and the effect thereof are the same as those of the circumferential grooves  41  described above.  
         [0052]    [0052]FIG. 3 shows a recess having a large number of spiral grooves  43 , in the same enlarged manner as that for the circumferential grooves  41  described above. A recess shown in FIG. 4 has a combination of two spiral grooves  43  and  45  with different directions of inclination.  
         [0053]    [0053]FIG. 5 shows a recess having a large number of dimples  47  extending in the circumferential direction, while FIG. 6 shows a recess having a large number of dimples  49  extending in a spiral direction. FIG. 7 shows a recess having a large number of dimples  51  extending in the axial direction.  
         [0054]    [0054]FIG. 8 shows a recess having circumferential grooves  41  and dimples  47  which are disposed alternately therein, while FIG. 9 shows a recess having spiral grooves  43  and dimples  49  which are disposed alternately therein. FIG. 10 shows a recess which has circumferential grooves  41  and dimples  51  extending in the axial direction connected to each other.  
         [0055]    A method of manufacturing the end bearing will be described below.  
         [0056]    [0056]FIGS. 11A to  11 D represent views for explaining a first embodiment of the method of manufacturing the end bearing, in which the manufacturing processing is conducted in the order from FIGS. 11A to  11 D. In the present embodiment, a recess  63  is annularly formed in the step of FIG. 11B by pressing a material (phosphor bronze plate)  61  shown in FIG. 11A. In the step of FIG. 11C, an annular blank  65  including the recess  63  is blanked, so as to form an end bearing  21  having an inner flange  33  and an outer flange  35  with a drawing die in the step of FIG. 11D. Note that on the formed end bearing  21 , a recess  63  is naturally positioned on the inner peripheral surface of the inner flange  33 .  
         [0057]    [0057]FIGS. 12A to  12 C represent views for explaining a second embodiment of the method of manufacturing the end bearing, in which the manufacturing processing is conducted in the order from FIGS. 12A to  12 C. In the present embodiment, a recess  63  is annularly formed by pressing a material  61  shown in FIG. 12A and, at the same time, by blanking an annular blank  65  with die cutting in the step of FIG. 12B, so as to form the end bearing  21  having the inner flange  33  and the outer flange  35  by means of a drawing die in the step of FIG. 12C.  
         [0058]    [0058]FIGS. 13A to  13 D represent views for explaining a third embodiment of the method of manufacturing the end bearing, in which the manufacturing processing is conducted in the order from FIGS. 13A to  13 D. In the present embodiment, an annular blank  65  is blanked in the step of FIG. 13B from a material  61  shown in FIG. 13A, a recess  63  is formed annularly by pressing work in the step of FIG. 13C, and then the end bearing  21  having the inner flange  33  and the outer flange  35  is formed with a drawing die in the step of FIG. 13D.  
         [0059]    [0059]FIGS. 14A to  14 E represent views for explaining a fourth embodiment of the method of manufacturing the end bearing, in which the manufacturing processing is conducted in the order from FIGS. 14A to  14 E. In the present embodiment, an annular blank  65  is formed by pressing work in the step of FIG. 14B from a material  61  shown in FIG. 14A. Then, in the steps of FIGS. 14C and 14D, the end bearing  21  having the inner flange  33  and the outer flange  35  is formed while forming a recess  63  annularly with a drawing die.  
         [0060]    [0060]FIGS. 15A to  15 F represent views for explaining a fifth embodiment of the method of manufacturing the end bearing, in which the manufacturing processing is conducted in the order from FIGS. 15A to  15 F. In the present embodiment, a recess  63  is annularly formed by pressing work in the step of FIG. 15B from a material  61  shown in FIG. 15A. Then, in the steps of FIGS. 15C and 15D, a disc-shaped blank  65  including the recess  63  is formed by blanking work. In the step of FIG. 15E, the central portion of the blank  65  is blanked, so as to form the end bearing  21  having the inner flange  33  and the outer flange  35  with a drawing die in the step of FIG. 15F.  
         [0061]    [0061]FIGS. 16A to  16 D represent views for explaining a sixth embodiment of the method of manufacturing the end bearing, in which the manufacturing processing is conducted in the order from FIGS. 16A to  16 D. In the present embodiment, a recess  63  is annularly formed by pressing work from a material  61  shown in FIG. 16A and, at the same time, a disc-shaped blank  65  is blanked in the step of FIG. 16B, and the central portion of the blank  65  is blanked in the step of FIG. 16D, so as to form, in the step of FIG. 16D, the end bearing  21  having the inner flange  33  and the outer flange  35  with a drawing die.  
         [0062]    [0062]FIGS. 17A to  17 E represent views for explaining a seventh embodiment of the method of manufacturing the end bearing, in which the manufacturing processing is conducted in the order from FIGS. 17A to  17 E. In the present embodiment, a disc-shaped blank  65  is formed by blanking work in the step of FIG. 17B from a material  61  shown in FIG. 17A, a recess  63  is formed annularly by pressing working in the step of FIG. 17C, and the central portion of the blank  65  is blanked in the step of FIG. 17D, so as to form, in the step of FIG. 17E, the end bearing  21  having the inner flange  33  and the outer flange  35  with a drawing die.  
         [0063]    [0063]FIGS. 18A to  18 E represent views for explaining an eighth embodiment of the method of manufacturing the end bearing, in which the manufacturing processing is conducted in the order from FIGS. 18A to  18 E. In the present embodiment, a disc-shaped blank  65  is formed by blanking work in the steps of FIGS. 18B and 18C from a material  61  shown in FIG. 18A, a recess  63  is annularly formed by pressing work and, at the same time, the central portion of the blank  65  is blanked in the step of FIG. 18D, so as to form, in the step of FIG. 18E, the end bearing  21  having the inner flange  33  and the outer flange  35  with a drawing die.  
         [0064]    [0064]FIGS. 19A to  19 F represent views for explaining a ninth embodiment of the method of manufacturing the end bearing, in which the manufacturing processing is conducted in the order from FIGS. 19A to  19 F. In the present embodiment, a disc-shaped blank  65  is formed by blanking work in the steps of FIGS. 19B and 19C, from a material  61  shown in FIG. 19A, the central portion of the blank  65  is blanked in the step of FIG. 19D, and a recess  63  is formed annularly by pressing work in the step of FIG. 19E, so as to form, in the step of FIG. 19F, the end bearing  21  having the inner flange  33  and the outer flange  35  with a drawing die.  
         [0065]    [0065]FIGS. 20A to  20 F represent views for explaining a tenth embodiment of the method of manufacturing the end bearing, in which the manufacturing processing is conducted in the order from FIGS. 20A to  20 F. In the present embodiment, a disc-shaped blank  65  is obtained by blanking a material  61  shown in FIG. 20A in the steps of FIGS. 20B and 20C and, in the step of FIG. 20D, the central portion of the blank  65  is blanked in the step of FIG. 20D, so as to form the end bearing  21  having the inner flange  33  and the outer flange  35  with a drawing die while forming the recess  63  annularly, in the step of FIGS. 20E and 20F.  
         [0066]    [0066]FIGS. 21A to  21 F represent views for explaining an eleventh embodiment of the method of manufacturing the end bearing, in which the manufacturing processing is conducted in the order from FIGS. 21A to  21 F. In the present embodiment, a recess  63  is annularly formed by pressing work in the step of FIG. 21B from a material  61  shown in FIG. 21A, an inner part of the recess  63  is blanked in the step of FIG. 21C, and the blank  65  is blanked from the material  61  in the step of FIGS. 21D and 21E, so as to form the end bearing  21  having the inner flange  33  and the outer flange  35  with a drawing die in the step of FIG. 21F.  
         [0067]    [0067]FIGS. 22A to  22 E represent views for explaining a twelfth embodiment of the method of manufacturing the end bearing, in which the manufacturing processing is conducted in the order from FIGS. 22A to  22 E. In the present embodiment, while a an inner part of a material  61  shown in FIG. 22A is blanked so as to annularly form a recess  63  by pressing work, the blank  65  is blanked from the material  61  at the same time in the step of FIGS. 22C and 22D, so that the end bearing  21  having the inner flange  33  and the outer flange  35  is formed with a drawing die in the step of FIG. 22E.  
         [0068]    [0068]FIGS. 23A to  23 F represent views for explaining a thirteenth embodiment of the method of manufacturing the end bearing, in which the manufacturing processing is conducted in the order from FIGS. 23A to  23 F. In the present embodiment, an inner part of a material  61  shown in FIG. 23A is blanked in the step of FIG. 23B, a recess  63  is formed annularly by pressing work in the step of FIG. 23C, and a blank  65  is blanked in the steps of FIGS. 23D and 23E, so as to form the end bearing  21  having the inner flange  33  and the outer flange  35  with a drawing die in the step of FIG. 23F  
         [0069]    [0069]FIGS. 24A to  24 E represent views for explaining a fourteenth embodiment of the method of manufacturing the end bearing, in which the manufacturing processing is conducted in the order from FIGS. 24A to  24 E. In the present embodiment, an inner part of a material  61  shown in FIG. 24A is blanked in the step of FIG. 24B, and while a recess  63  is formed annularly by pressing work and a blank  65  is formed by blanking work in the steps of FIGS. 24C and 24D, the blank  65  is obtained by blanking work at the same time, so as to form the end bearing  21  having the inner flange  33  and the outer flange  35  with a drawing die in the step of FIG. 24E.  
         [0070]    [0070]FIGS. 25A to  25 E represent views for explaining a fifteenth embodiment of the method of manufacturing the end bearing, in which the manufacturing processing is conducted in the order from FIGS. 25A to  25 E. In the present embodiment, an inner part of a material  61  shown in FIG. 25A is blanked in the step of FIG. 25B, a blank  65  is blanked in the steps of FIG. 25C and a recess  63  is annularly formed by pressing work in the step of FIG. 25D, so as to form the end bearing  21  having the inner flange  33  and the outer flange  35  with a drawing die in the step of FIG. 25E.  
         [0071]    [0071]FIGS. 26A to  26 F represent views for explaining a sixteenth embodiment of the method of manufacturing the end bearing, in which the manufacturing processing is conducted in the order from FIGS. 26A to  26 F. In the present embodiment, an inner part of a material  61  shown in FIG. 26A is blanked in the step of FIG. 26B, and a blank  65  is blanked in the steps of FIGS. 26C and 26D, so as to form the end bearing  21  having the inner flange  33  and the outer flange  35  while forming a recess  63  annularly with a drawing die in the steps of FIGS. 26E and 26F.  
         [0072]    Though specific embodiments of the invention are as described above, the present invention is not limited to these. For example, the present invention may be applied to an end bearing of a one-way clutch device of a type other than a sprag type. Besides, in an end bearing in slidable contact with an outer race, a recess may be formed on the outer peripheral surface thereof. The end bearing and the recess are not always required to be formed by plastic pressing, but may be formed by cutting work. A sole material for the end bearing may include copper alloy other than phosphor bronze, soft steel, stainless steel, or the like. As a bimetal material for the end bearing, a material such as lead bronze, high lead bronze, copper lead, Babbit&#39;s metal, cadmium alloy, plated silver, or the like, may be employed on the bearing side, while copper, cast iron, bronze, or the like, may be employed on the rear metal side. In addition, soft steel coated with any of kind of copper alloy or lead may be employed. The shapes or layout of the recesses arranged on the end bearing are not limited to those shown in the drawings. It is possible to coat or bury the recesses prepared in advance. In this case, when the coating agent is constricted or peeled off, the recesses are gradually exposed. Other specific arrangements of the one-way clutch device such as the shape of the web, or the like, of the end bearing can be properly changed within the scope of the spirit of the present invention.  
         [0073]    According to the end bearing of the present invention, it is possible to prevent local abrasion or scorching of the end bearing, and according to the method of manufacturing the end bearing of the present invention, it is possible to manufacture the end bearing with efficiency.