Abstract:
A motor with single bearing comprises a fan blade set, a motor set and a fan blade base. The fan blade set has a fan blade hub to join with a spindle fitting with a bearing. The motor set is attached to the fan blade base and a hollow axial seat is provided in the fan blade base to receive the bearing. Further, an elastic element or magnetic element is disposed at the axial seat to avoid internal clearance being created by lacking preset pressure acing to the bearing casing and balls therein. The balls and the bearing itself can run successfully to enhance operation of the motor effectively.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention is related to a motor with single bearing and particularly to an elastic element or magnetic element provided in the axial seat of a motor and the elastic element or the magnetic element to offer preset pressure to the bearing casing and the balls therein such that it prevents from producing internal clearance and allows the balls and the bearing run successfully. 
     2. Brief Description of the Related Art 
     Due to rapid progress of computer information industry, the central processing unit in the information product provides much faster operation speed and heat generation becomes much more increased. Cooling device is utilized as a basic arrangement in the information product to dissipate heat. Currently, the most popular cooling device is cooling fan because of being convenient in use and cheap in cost. Quality of a cooling fan completely depends on the operational state being good or bad. Unsteady motor significantly influences normal operation of entire system or device. More specifically, the bearing in the motor is key factor influencing quality and steadiness of the motor. 
     Generally, ball bearings in the motor provide a plurality of balls turning in the bearing casing while the bearing runs. It is very easy for the bearings to create internal clearances and these internal clearances affect operation and effect of the motor to result in deficiencies such as vibration, noise, heat generation and power abnormal consumption. 
     In addition, balls vibrate in the bearing can cause the rolling channel minor vibrating wear. Thus, it is required to exert an appropriate preset pressure to solve the problem resulting from internal clearances. 
     SUMMARY OF THE INVENTION 
     An object of the present invention is to provide a motor with single bearing with which an elastic element or magnetic element is disposed at the axial seat to create a preset pressure against the bearing casing and balls therein to avoid internal clearance being created so that balls and the bearing itself can run successfully to enhance operation of the motor effectively. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The detail structure, the applied principle, the function and the effectiveness of the present invention can be more fully understood with reference to the following description and accompanying drawings, in which: 
         FIG. 1  is a sectional view of the first embodiment of single bearing of a motor according to the present invention; 
         FIG. 2  is a sectional view of the second embodiment of single bearing of a motor according to the present invention; 
         FIG. 3  is a sectional view of the third embodiment of single bearing of a motor according to the present invention; 
         FIG. 4  is a sectional view of the fourth embodiment of single bearing of a motor according to the present invention; 
         FIG. 5  is a sectional view of the fifth embodiment of single bearing of a motor according to the present invention; 
         FIG. 6  is a sectional view of the sixth embodiment of single bearing of a motor according to the present invention; 
         FIG. 7  is a sectional view of the seventh embodiment of single bearing of a motor according to the present invention; 
         FIG. 8  is a sectional view of the eighth embodiment of single bearing of a motor according to the present invention; 
         FIG. 9  is a sectional view of the ninth embodiment of single bearing of a motor according to the present invention; 
         FIG. 10  is a sectional view of the tenth embodiment of single bearing of a motor according to the present invention; 
         FIG. 11  is a sectional view of the eleventh embodiment of single bearing of a motor according to the present invention; 
         FIG. 12  is a sectional view of the twelfth embodiment of single bearing of a motor according to the present invention; 
         FIG. 13  is a sectional view of the thirteenth embodiment of single bearing of a motor according to the present invention; 
         FIG. 14  is a sectional view of the fourteenth embodiment of single bearing of a motor according to the present invention; 
         FIG. 15  is a sectional view of the fifteenth embodiment of single bearing of a motor according to the present invention; 
         FIG. 16  is a sectional view of the sixteenth embodiment of single bearing of a motor according to the present invention; 
         FIG. 17  is a sectional view of the seventeenth embodiment of single bearing of a motor according to the present invention; 
         FIG. 18  is a sectional view of the eighteenth embodiment of single bearing of a motor according to the present invention; 
         FIG. 19  is a sectional view of the nineteenth embodiment of single bearing of a motor according to the present invention; 
         FIG. 20  is a sectional view of the twentieth embodiment of single bearing of a motor according to the present invention; 
         FIG. 21  is a sectional view of the twenty-first embodiment of single bearing of a motor according to the present invention; 
         FIG. 22  is a sectional view of the twenty-second embodiment of single bearing of a motor according to the present invention; 
         FIG. 23  is a sectional view of the twenty-third embodiment of single bearing of a motor according to the present invention; 
         FIG. 24  is a sectional view of the twenty-fourth embodiment of single bearing of a motor according to the present invention; 
         FIG. 25  is a sectional view of the twenty-fifth embodiment of single bearing of a motor according to the present invention; 
         FIG. 26  is a sectional view of the twenty-sixth embodiment of single bearing of a motor according to the present invention; 
         FIG. 27  is a sectional view of the twenty-seventh embodiment of single bearing of a motor according to the present invention; 
         FIG. 28  is a sectional view of the twenty-eighth embodiment of single bearing of a motor according to the present invention; and 
         FIG. 29  is a sectional view of the twenty-ninth embodiment of single bearing of a motor according to the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Referring to  FIG. 1 , the first embodiment of a motor with single bearing according to the present invention comprises a fan blade set  10 , a motor set  20  and a fan base  30 . The fan blade set  10  is composed of a fan blade hub  11 , a spindle  12 , a motor casing  13  and a magnetic strip  14 . The spindle  12  is attached to a spindle seat  111  at the central bottom of the fan blade hub  11 . The motor casing  13  is provided at the inner side of the fan blade hub  11  and the magnetic stripe  14  is disposed at the inner side of the motor casing  13 . 
     The motor set  20  is attached to the fan base  30  and is composed of an insulation frame  21 , silicon-steel sheet  22 , a circuit board  23  and a coil  24 . The silicon-steel stripe  22  is disposed outside the insulation frame  21  and surrounds the insulation frame  21  with the coil  24 . The fan base  30  has a hollow axial seat  31  at the center thereof and the circuit board  23  is disposed between the axial seat  31  and the bottom of the insulation frame  21 . The spindle  12  is mounted in a receiving space of the axial seat  31 . A bearing  32  is fitted between the spindle  12  and the axial seat  31  with a plurality of balls in the bearing  32  (not shown) to allow the spindle  12  rotating under being loaded with the bearing  32 . Further, a oil ring R is provided between the bearing  32  and the fan blade hub  11 . 
     The axial seat  31  has a jut part  311  and an engaging piece  312  at the inner side thereof and the spindle  12  has a circular shape with a retaining ring  15  at an end thereof without connecting with the fan blade hub  11 . The bearing  32  can be located by way of the jut part  311  limiting the bearing  32  and the bearing  32  interferes with the retaining ring  15  to prevent the spindle  12  from escaping from the axial seat  31 . The axial seat  31  has a bottom  313  to limit the end of the spindle  12  not connecting with the fan lade hub  11 . An elastic element A is provided between the engaging piece  312  and the bottom  313  of the axial seat  31  to produce an elastic force against the bearing including the bearing casing and the internal balls as a preset pressure so as to avoid internal clearance caused by lacking the preset pressure and to facilitate successful running of the balls and the bearing  32  for enhancing the operational effect of the motor and such as reducing vibration, noise, heat generation and power consumption and prolonging the life span. In practice, the elastic element A can be a spring, an elastic sheet, an elastic washer or a magnetic component. The elastic element A shown in the figure is a spring. Besides, the bottom  313  of the axial seat  31  can be an independent part of the axial seat  31 . 
     Referring to  FIG. 2 , the second embodiment of a motor with single bearing according to the present invention is illustrated. The structure of the second embodiment is almost the same as the first embodiment and the difference of the second embodiment from the first embodiment is in that the elastic element A is an elastic stripe. 
     Referring to  FIG. 3 , the third embodiment of a motor with single bearing according to the present invention is illustrated. The structure of the third embodiment is almost the same as the first embodiment and the difference of the third embodiment from the first embodiment is in that a wear elastic stripe G can be added between the bottom  313  and the end without connecting with the fan blade hub  11  on the spindle  12 , i.e., the wear elastic sheet G can be attached to a lateral side of the bottom  313  of the axial seat  31  so that that the spindle  12  or the axial seat  31  becomes less wear and life span thereof can be extended. 
     Referring to  FIG. 4 , the fourth embodiment of a motor with single bearing according to the present invention is illustrated. The structure of the fourth embodiment is almost the same as the second embodiment and the difference of the fourth embodiment from the second embodiment is in that a wear elastic stripe G can be added between the bottom  313  and the end without connecting with the fan blade hub  11  on the spindle  12 , i.e., the wear elastic sheet G can be attached to a lateral side of the bottom  313  of the axial seat  31  such that the spindle  12  can be free from contacting with bottom  313  of the axial seat  31  to provide a function of the third embodiment. 
     Referring to  FIG. 5 , the fifth embodiment of a motor with single bearing according to the present invention is illustrated. The structure of the fifth embodiment is almost the same as the first embodiment and the difference of the fifth embodiment from the first embodiment is in that the center of the fan base  3  has a central hole  33  and a baffle piece B can be inserted between the elastic element A and the engaging piece  312  to hide the central hole  33  for keeping the entire fan base  3  being pleased to the eye. 
     Referring to  FIG. 6 , the sixth embodiment of a motor with single bearing according to the present invention is illustrated. The structure of the sixth embodiment is almost the same as the second embodiment and the difference of the sixth embodiment from the second embodiment is in that the center of the fan base  3  has a central hole  33  and a baffle piece B can be inserted between the elastic element A and the engaging piece  312  to hide the central hole  33 . It provides the same function as the fifth embodiment. 
     Referring to  FIG. 7 , the seventh embodiment of a motor with single bearing according to the present invention is illustrated. The structure of the seventh embodiment is almost the same as the third embodiment and the difference of the seventh embodiment from the third embodiment is in that the center of the fan base  3  has a central hole  33  and a baffle piece B can be inserted between the elastic element A and the engaging piece  312  to hide the central hole  33 . It provides the same function as the fifth embodiment. 
     Referring to  FIG. 8 , the eighth embodiment of a motor with single bearing according to the present invention is illustrated. The structure of the seventh embodiment is almost the same as the fourth embodiment and the difference of the seventh embodiment from the fourth embodiment is in that the center of the fan base  3  has a central hole  33  and a baffle piece B can be inserted between the elastic element A and the engaging piece  312  to hide the central hole  33 . It provides the same function as the fifth embodiment. 
     Referring to  FIG. 9 , the ninth embodiment of a motor with single bearing according to the present invention is illustrated. The structure of the ninth embodiment is almost the same as the first embodiment and the difference of the seventh embodiment from the fourth embodiment is in that the spindle  12  has a circular end without connecting with the preceding fan blade hub  11  and the bottom  313  has a circular groove  3131  corresponding to the circular end of the spindle  12  so as to connect with the spindle  12 . Thus, the spindle  12  can rotate in accordance with the circular groove  3131  and the spindle  12  can a function of locating to constitute a steady state of rotation by way of support of the bottom  313  of the axial seat  31  and the bearing  32 . 
     Referring to  FIG. 10 , the tenth embodiment of a motor with single bearing according to the present invention is illustrated. The structure of the seventh embodiment is almost the same as the second embodiment and the difference of the tenth embodiment from the second embodiment is in that the spindle  12  has a circular end without connecting with the preceding fan blade hub  11  and the bottom  313  has a circular groove  3131  corresponding to the circular end of the spindle  12  so as to connect with the spindle  12 . Thus, the spindle  12  can rotate in accordance with the circular groove  3131  and the spindle  12  can provide a function of locating and constitute a steady state of rotation by way of support of the bottom  313  of the axial seat  31 . The bottom  313  provides a function the same as the ninth embodiment and no further detail will be described here. 
     Referring to  FIG. 11 , the eleventh embodiment of a motor with single bearing according to the present invention is illustrated. The structure of the eleventh embodiment is almost the same as the ninth embodiment and the difference of the tenth embodiment from the ninth embodiment is in that the center of the fan base  3  has a central hole  33  and a baffle piece B can be inserted between the elastic element A and the engaging piece  312  to hide the central hole  33 . The baffle piece B provides the same function as the fifth embodiment and no further detail will be described here. 
     Referring to  FIG. 12 , the twelfth embodiment of a motor with single bearing according to the present invention is illustrated. The structure of the twelfth embodiment is almost the same as the tenth embodiment and the difference of the tenth embodiment from the ninth embodiment is in that the center of the fan base  3  has a central hole  33  and a baffle piece B can be inserted between the elastic element A and the engaging piece  312  to hide the central hole  33 . The baffle piece B provides the same function as the fifth embodiment and no further detail will be described here. 
     Referring to  FIG. 13 , the thirteenth embodiment of a motor with single bearing according to the present invention is illustrated. The structure of the thirteenth embodiment is almost the same as the first embodiment and the difference of the thirteenth embodiment from the tenth embodiment is in that the elastic element A is provided between the engaging piece  312  and an end of the spindle  12  without connecting with the fan blade hub  11 . It is noted that the axial seat is without the preceding bottom  313 . 
     Referring to  FIG. 14 , the fourteenth embodiment of a motor with single bearing according to the present invention is illustrated. The structure of the fourteenth embodiment is almost the same as the thirteenth embodiment and the difference of the tenth embodiment from the ninth embodiment is in that the center of the fan base  3  has a central hole  33  and a baffle piece B can be inserted between the elastic element A and the engaging piece  312  to hide the central hole  33 . The baffle piece B provides the same function as the fifth embodiment. 
     Referring to  FIG. 15 , the fifteenth embodiment of a motor with single bearing according to the present invention is illustrated. The structure of the fifteenth embodiment is almost the same as the first embodiment and the difference of the fifteenth embodiment from the first embodiment is in that the elastic element A is provided between the bearing  32  and the jut part  311 . Besides, referring to  FIG. 16 , the sixteenth embodiment of a motor with single bearing according to the present invention is illustrated. The structure of the sixteenth embodiment is almost the same as the fifteenth embodiment and the difference of the tenth embodiment from the ninth embodiment is in that a wear elastic stripe G can be added between the bottom  313  and the end without connecting with the fan blade hub  11  on the spindle  12 , i.e., the wear elastic sheet G can be attached to a lateral side of the bottom  313  of the axial seat  31  so that the spindle  12  do not touch the bottom  313  to lessen wear of the spindle  12  or the axial seat  31 . 
     Referring to  FIG. 17 , the seventeenth embodiment of a motor with single bearing according to the present invention is illustrated. The structure of the seventeenth embodiment is almost the same as the fifteenth embodiment and the difference of the seventh embodiment from the fifteenth embodiment is in that the spindle  12  has a circular end without connecting with the preceding fan blade hub  11  and the bottom  313  has a circular groove  3131  corresponding to the circular end of the spindle  12  so as to connect with the spindle  12 . Thus, the spindle  12  can rotate in accordance with the circular groove  3131 . The bottom  313  provides the same function as ninth embodiment so that no further detail will be described. 
     Referring to  FIG. 18 , the eighteenth embodiment of a motor with single bearing according to the present invention is illustrated. The structure of the eighteenth embodiment is almost the same as the first embodiment and the difference of the eighteenth embodiment from the first embodiment is in that the elastic element A is disposed between the bearing  32  and the retaining ring  15 . 
     Referring to  FIG. 19 , the nineteenth embodiment of a motor with single bearing according to the present invention is illustrated. The structure of the nineteenth embodiment is almost the same as the eighteenth embodiment and the difference of the nineteenth embodiment from the eighteenth embodiment is in that a wear elastic stripe G can be added between the bottom  313  and the end without connecting with the fan blade hub  11  on the spindle  12 , i.e., the wear elastic sheet G can be attached to a lateral side of the bottom  313  of the axial seat  31  so that the spindle  12  do not touch the bottom  313  to lessen wear of the spindle  12  or the axial seat  31 . 
     Referring to  FIG. 20 , the twentieth embodiment of a motor with single bearing according to the present invention is illustrated. The structure of the twentieth embodiment is almost the same as the eighteenth embodiment and the difference of the seventh embodiment from the fifteenth embodiment is in that the spindle  12  has a circular end without connecting with the preceding fan blade hub  11  and the bottom  313  has a circular groove  3131  corresponding to the circular end of the spindle  12  so as to connect with the spindle  12 . Thus, the spindle  12  can rotate in accordance with the circular groove  3131 . The bottom  313  provides the same function as ninth embodiment so that no further detail will be described. 
     Referring to  FIG. 21 , the twenty-first embodiment of a motor with single bearing according to the present invention is illustrated. The structure of the twenty-first embodiment is almost the same as the first embodiment and the difference of the twenty-first embodiment from the first embodiment is in that the elastic element A is replaced with magnetic elements A 1 , A 2  to be provided between the bottom  313  and the engaging piece  31 . The magnetic elements A 1 , A 2  provide identical magnetic-poles so as to reject to each other and produce a preset pressure to the bearing including the bearing case and the balls therein. The effect of the magnetic elements A 1 , A 2  is the same as the elastic element and no further detail will be described. 
     Referring to  FIG. 22 , the twenty-second embodiment of a motor with single bearing according to the present invention is illustrated. The structure of the twenty-second embodiment is almost the same as the twenty-first embodiment and the difference of the twenty-second embodiment from the twenty-first embodiment is in that a wear elastic stripe G can be added between the bottom  313  and the end without connecting with the fan blade hub  11  on the spindle  12 , i.e., the wear elastic sheet G can be attached to a lateral side of the bottom  313  of the axial seat  31  so that the spindle  12  do not touch the bottom  313  to lessen wear of the spindle  12  or the axial seat  31 . The function of the wear elastic stripe G is the same as the third embodiment. 
     Referring to  FIG. 23 , the twenty-third embodiment of a motor with single bearing according to the present invention is illustrated. The structure of the twenty-second embodiment is almost the same as the twenty-first embodiment and the difference of the twenty-second embodiment from the twenty-first embodiment is in that the bottom  313  has a circular groove  3131  to connect with the spindle  12 . Thus, the spindle  12  can rotate in accordance with the circular groove  3131 . The bottom  313  provides the same function as ninth embodiment so that no further detail will be described. 
     Referring to  FIG. 24 , the twenty-fourth embodiment of a motor with single bearing according to the present invention is illustrated. The structure of the twenty-fourth embodiment is almost the same as the twenty-first embodiment and the difference of the twenty-second embodiment from the twenty-first embodiment is in that the magnetic elements A 1 , A 2  are provided between the jut part  311  and the bearing  32  respectively. Besides, referring to  FIG. 25 , the twenty-fifth embodiment of a motor with single bearing according to the present invention is illustrated. The structure of the twenty-fifth embodiment is almost the same as the twenty-fourth embodiment and the difference of the twenty-sixth embodiment from the twenty-fourth embodiment is in that a wear elastic stripe G can be added between the bottom  313  and the end without connecting with the fan blade hub  11  on the spindle  12 , i.e., the wear elastic sheet G can be attached to a lateral side of the bottom  313  of the axial seat  31  so that the spindle  12  do not touch the bottom  313  to lessen wear of the spindle  12  or the axial seat  31 . The function of the wear elastic stripe G is the same as the third embodiment. 
     Referring to  FIG. 26 , the twenty-sixth embodiment of a motor with single bearing according to the present invention is illustrated. The structure of the twenty-sixth embodiment is almost the same as the twenty-fourth embodiment and the difference of the twenty-sixth embodiment from the twenty-fourth embodiment is in that the bottom  313  has a circular groove  3131  corresponding to the circular end of the spindle  12  so as to connect with the spindle  12 . Thus, the spindle  12  can rotate in accordance with the circular groove  3131 . The bottom  313  provides the same function as ninth embodiment so that no further detail will be described. 
     Referring to  FIG. 27 , the twenty-seventh embodiment of a motor with single bearing according to the present invention is illustrated. The structure of the twenty-seventh embodiment is almost the same as the twenty-first embodiment and the difference of the twenty-seventh embodiment from the twenty-first embodiment is in that the bearing  32  can be located by way of the jut part  311  limiting the bearing  32  and the bearing  32  interferes with the retaining ring  15  to prevent the spindle  12  from escaping from the axial seat  31 . The axial seat  31  in the present embodiment is provided without the bottom  313 . Besides, the magnetic elements A 1 , A 2  are provided between the engaging piece  312  and an edge of an end on the spindle  12  without connecting with the a fan blade hub  11  respectively. It is noted that the edge can facially contact with the retaining ring  15 . 
     Referring to  FIG. 28 , the twenty-eighth embodiment of a motor with single bearing according to the present invention is illustrated. The structure of the twenty-eighth embodiment is almost the same as the twenty-seventh embodiment and the difference of the twenty-eighth embodiment from the twenty-seventh embodiment is in that the magnetic elements A 1 , A 2  are provided between the jut part  311  and the bearing  32  respectively. 
     Referring to  FIG. 29 , the twenty-ninth embodiment of a motor with single bearing according to the present invention is illustrated. The structure of the twenty-ninth embodiment is almost the same as the twenty-seventh embodiment and the difference of the twenty-ninth embodiment from the twenty-eighth embodiment is in that the magnetic element A 2  is provided at the inner side of the axial seat  111 . 
     While the invention has been described with referencing to preferred embodiments thereof, it is to be understood that modifications or variations may be easily made without departing from the spirit of this invention, which is defined by the appended claims.