Patent Publication Number: US-2012036691-A1

Title: Bearing mounting and dismounting tool

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a tool, and more particularly to a bearing mounting and dismounting tool. 
     2. Description of the Related Art 
     Conventionally, a bearing is mounted onto a mechanical component or removed from a mechanical component generally by hammering the bearing, but the hammering method not only damages the mechanical component or the bearing easily, but also incurs a risk of injuring an operator accidentally. 
     In view of the foregoing drawback of the prior art, the inventor of the present invention conducted extensive researches and experiments, and finally invented a bearing mounting and dismounting tool in accordance with the present invention. 
     SUMMARY OF THE INVENTION 
     Therefore, it is a primary objective of the invention to provide a bearing mounting and dismounting tool with the effect of facilitating an operator to mount or dismount a bearing. 
     To achieve the foregoing objectives, the present invention provides a bearing mounting and dismounting tool for mounting or dismounting a bearing at a mounting hole of a mechanical component, and the bearing mounting and dismounting tool comprises: 
     a first pipe, having an internal diameter greater than an external diameter of the bearing, and an external diameter of the first pipe greater than a hole diameter of the mounting hole; 
     a second pipe, coaxially aligned with the first pipe, and having an external diameter smaller than an internal diameter of the first pipe, and abuttable against a distal surface of the bearing; 
     an operating module, including two discs abutted against the first and second pipes respectively, and the two discs having a plurality of abutting surfaces with different widths and in a continuous stairway shape disposed at positions of abutting the distal surfaces of the discs, and a screw rod being coaxially passed through the first and second pipes, and both ends of the screw rod being passed through and out of the discs respectively, and both ends of the screw rod passed out from each disc being screwed with a screw thread insert for forcing the two discs to move the first and second pipes; 
     such that the first pipe can be installed onto a peripheral wall of a mounting hole of a mechanical component that is installed with the bearing, and the second pipe can be abutted against the distal surface of the bearing installed in the mounting hole, and the screw thread insert of the operating module can be rotated to change the relative positions of the first and second pipes in order to mount or dismount the bearing. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an exploded view of a preferred embodiment of the present invention; 
         FIG. 2  is a schematic view of an application of a preferred embodiment of the present invention, showing that a first pipe is abutted against a peripheral wall of a mounting hole and a second pipe is abutted from another side against a distal surface of a bearing installed in the mounting hole; and 
         FIG. 3  is a schematic view of an application of a preferred embodiment of the present invention, showing that a bearing is being dismounted. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     With reference to  FIGS. 1 to 3  for a structure of a preferred embodiment of the present invention, the figures are provided for the illustration purpose only, but not intended for limiting the scope of the present invention. 
     The present invention provides a bearing mounting and dismounting tool for dismounting a bearing  10  from a mounting hole  51  of a mechanical component  50  or mounting the bearing  10  onto the mounting hole  51  of the mechanical component  50 . The bearing mounting and dismounting tool comprises a first pipe  20 , a second pipe  30  and an operating module  40 . 
     The first pipe  20  is a circular pipe with an appropriate length, and an end of the first pipe  20  can be abutted against a peripheral wall of the mounting hole  51  of the mechanical component  50  installed with the bearing  10 . More specifically, the internal diameter of the first pipe  20  should be greater than the external diameter of the bearing  10  to prevent the first pipe  20  from being contacted with a distal surface of the bearing  10 , and the external diameter of the first pipe  20  should be greater than the hole diameter of mounting hole  51  to provide a force applying position to abut against the peripheral wall of the mounting hole  51 . 
     The second pipe  30  is also a circular pipe with an appropriate length, and coaxially aligned with the first pipe  20 , and an end of the second pipe  30  is abutted against a distal surface of the bearing  10 . More specifically, the external diameter of the second pipe  30  should be smaller than the internal diameter of the first pipe  20  to allow the second pipe  30  to passed into the first pipe  20 , and an end of the second pipe  30  can be abutted against the distal surface of the bearing  10  to constitute a contact position with the bearing  10 . 
     The operating module  40  includes two disc  41  abutted against opposite ends of the first and second pipes  20 ,  30  respectively, and the two discs  41  include a plurality of abutting surfaces  411  with different widths and in a continuous stairway shape disposed in the same direction on the distal surface of the corresponding pipes, and an embedding slot  412  concavely formed on another distal surface of each of the two discs  41 , and a screw rod  42  is coaxially passed into the first and second pipes  20 ,  30 , and both ends of the screw rod  42  are passed out from the two discs  41  respectively, and two screw thread inserts  43  are screwed onto both ends of the screw rod  42  respectively, and each screw thread insert  43  further includes a top compressing element  44  sheathed on the screw thread insert  43  and embeddable into the embedding slot  412  of the corresponding disc  41 , and each screw thread insert  43  can be rotated to drive the top compressing element  44  to push the disc  41  to move along the axial direction of the screw rod  42 , and push the first and second pipes  20 ,  30  to change their relative positions. 
     With reference to  FIGS. 2 and 3  for the applications of the bearing mounting and dismounting tool in accordance with the present invention, the first pipe  20  is abutted against the peripheral wall of the mounting hole  51  of the mechanical component  50  installed with the bearing  10 , and the second pipe  30  is abutted from another side against the distal surface of the bearing  10  in the mounting hole  51 , such that the first and second pipes  20 ,  30  are clamped by both sides of the mounting hole  51  of the mechanical component  50  (as shown in  FIG. 2 ), such that when an external force is applied to screw and rotate the screw thread insert  43  abutted against the disc  41  of the second pipe  30 , the disc  41  on the second pipe  30  can push the second pipe  30  to move towards the first pipe  20  while pressing the bearing  10  to move towards the first pipe  20  at the same time, so as to achieve the effect of dismounting the bearing  10  (as shown in  FIG. 3 ). 
     Similarly, the aforementioned method can be used for mounting the bearing  10  into the mechanical component  50  of the mounting hole  51 , so as to achieve the effect of mounting the bearing  10 . 
     It is noteworthy to point out that the size of the first and second pipes  20 ,  30  in accordance with this preferred embodiment can be changed according to the size of the bearing, and the disc having the plurality of abutting surfaces and in the continuous stairway shape and abutted against the end of the corresponding pipe is actually designed according to such size, so that the disc  41  also can be designed according to the size of the first and second pipes. 
     While the invention has been described by device of specific embodiments, numerous modifications and variations such as an increased quantity of the pipes, a different way of connecting the pipes in series could be made thereto by those generally skilled in the art without departing from the scope and spirit of the invention set forth in the claims.