JP2013223390A - Method for replacing bearing part of rotary electric machine and replacement holder thereof - Google Patents

Abstract

[PROBLEMS] To replace a bearing, the rotor needs to be pulled out from the stator frame. The rotor is attracted to the stator by the magnetic force of a strong permanent magnet inserted into the rotor, and the rotor is removed. There is a risk that it may not be possible to take out. For this reason, a large dismantling device is necessary so that the rotor is not attracted to the stator by the magnetic force of a strong permanent magnet.
A joint shaft is fixed to an end of a rotating shaft of a rotating electrical machine, a first jig supporting the joint shaft is fixed to the bearing bracket, and the bearing assembly is removed from the bearing bracket. The second jig supporting the rotating shaft from which the bearing assembly has been removed is fixed to the bearing bracket, the bearing assembly and the first jig are removed, and then the new bearing assembly is placed between the bearing bracket and the rotating shaft. I tried to intervene.
[Selection] Figure 11

Description

  The present invention relates to a method for replacing a bearing portion for bearing a rotating shaft of a rotary electric machine such as a generator or an electric motor, and an exchange jig therefor.

  Rotating electrical machines such as generators and electric motors are used in many industrial fields. By the way, this type of rotating electrical machine needs to be replaced while the bearing supporting the rotating shaft is worn and damaged during use.

  In a small rotating electrical machine, it is conceivable to replace the rotating electrical machine itself, but since a relatively large rotating electrical machine is expensive, it cannot be easily replaced. For this reason, the bearing itself is replaced with a new bearing.

  For example, a generator mounted on a diesel locomotive or the like is installed directly connected to a diesel engine in a power room of the vehicle. One of the rotating shafts with the generator rotor is connected and fixed to the crankshaft of the diesel engine via a coupling, but the rotating shaft on the opposite side is a bearing provided in the generator casing. It is supported.

  This bearing is worn and damaged when the generator is operated for a long period of time, and is therefore replaced as necessary. In order to replace the bearing, it is necessary to pull out the rotor from the stator frame.

  Here, for example, there is a technique described in Japanese Patent Application Laid-Open No. 2008-99491 (Patent Document 1) as a method for replacing the bearing. In this Patent Document 1, a method is described in which a rotor support device is provided inside an electric motor, and the support device is moved to fix the rotor to the stator frame and replace the bearing. The bearings are replaced without removing them from the stator frame.

JP 2008-99491 A

  For example, in recent years, a high-efficiency generator has been demanded, and a permanent magnet generator in which a strong permanent magnet such as a neodymium magnet is inserted inside the rotor has begun to be adopted.

  In order to replace the bearing, it is necessary to pull out the rotor from the stator frame, but the rotor is attracted to the stator by the magnetic force of the strong permanent magnet inserted inside the rotor, and the rotor can be taken out. There is a risk that nothing will happen. For this reason, a large dismantling device is necessary so that the rotor is not attracted to the stator by the magnetic force of a strong permanent magnet. However, it is impossible to arrange a large dismantling device in a narrow vehicle space such as a generator of a diesel locomotive, which is not a preferable method.

  Even if the rotor is successfully pulled out, a strong permanent magnet is inserted inside the rotor, which may increase the risk that the permanent magnet will attract metal tools and damage the rotor. There is also.

  An object of the present invention is to propose a method of replacing a bearing portion of a rotating electrical machine that does not require a large dismantling device and a replacement jig thereof.

  A feature of the present invention is that the joint shaft is fixed to the end of the rotating shaft portion of the rotating electric machine, and the first jig supporting the joint shaft is fixed to the bearing bracket, and then the joint shaft is fixed by the first jig. The bearing assembly is removed from the bearing bracket in a supported state, and then a second jig supporting the rotating shaft from which the bearing assembly has been removed is fixed to the bearing bracket, and then rotated by the second jig. Remove the bearing assembly and the first jig while the shaft is supported, and then insert the new bearing assembly and the first jig into the joint shaft to support the joint shaft with the first jig. With the first jig supporting the joint shaft, the second jig is removed and a new bearing assembly is interposed between the bearing bracket and the rotating shaft.

  According to the present invention, since the bearing assembly can be replaced without removing the rotor from the stator, the bearing assembly can be replaced without requiring a large dismantling device.

It is sectional drawing which shows the structure of the generator driven by the diesel engine to which this invention is applied. FIG. 2 is a partially enlarged view of the vicinity of the bearing assembly shown in FIG. 1. It is a front view of the 1st replacement jig used for replacement | exchange of a bearing part in one Example of this invention. It is AA sectional drawing of the 1st replacement jig shown in FIG. It is a front view of the 2nd exchange jig used for exchange of a bearing part in one example of the present invention. It is BB sectional drawing of the 2nd exchange jig shown in FIG. FIG. 5 is a partial cross-sectional view showing a procedure for replacing the bearing portion according to an embodiment of the present invention, with the stopper of the bearing and the external lid portion removed. FIG. 5 is a partial cross-sectional view showing a procedure for replacing the bearing portion according to an embodiment of the present invention, in which a joint shaft and a first replacement jig are attached. It is a fragmentary sectional view of the state where the exchange procedure of a bearing part was shown in one example of the present invention, and the bearing box was moved horizontally. It is a fragmentary sectional view in the state where the exchange procedure of the bearing part was shown in the example of the present invention, and the joint shaft and the 2nd exchange jig were attached. It is a fragmentary sectional view in the state where the exchange procedure of a bearing part was shown in one example of the present invention, and the 1st exchange jig and the bearing assembly were removed.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to these embodiments, and includes various modifications and applications within the basic concept of the present invention.

  FIG. 1 shows a cross-sectional view of a generator mounted on a diesel locomotive or the like, and the generator is installed directly connected to a diesel engine in a power room of the vehicle.

  One shaft portion 103B of the rotating shaft 103A provided with the generator rotor 103 is connected and fixed to a crank shaft of a diesel engine (not shown) via a coupling 111, and the rotating shaft 103A on the opposite side is connected to the crank shaft. The other shaft portion 103C is supported by a bearing assembly 115 provided on the stator frame 101 of the generator.

  The stator frame 101 is cylindrical and has a side plate 101A on one end side, and the other end side is opened, and a bearing bracket (hereinafter referred to as a bracket) 104 is fixed with a bolt 116 so as to close the open portion.

  A stator 102 having a stator winding 102A is fixed to the inner periphery of the stator frame 101 by means such as adhesion and bolting.

  A rotor 103 is disposed inside the stator 102, and the rotor 103 is fixed to a rotating shaft 103A. As described above, the coupling 111 that is directly connected to the crankshaft of the engine is attached to one shaft portion 103B of the rotating shaft 103A. Therefore, the rotation of the engine is transmitted to the rotating shaft 103A through the coupling 111 to rotate the rotor 103.

  The other shaft portion 103C of the rotating shaft 103A is rotatably supported by a bearing assembly 115 attached to the bracket 104. Therefore, the rotating shaft 103 is supported by the coupling 111 and the bearing assembly 115.

  The bearing assembly 115 is provided near the center of the bracket 104, and the bearing assembly 115 is fixed to the bracket 104 via a bearing box 106. The bearing housing 106 is fixed to the outer side surface of the bracket 104 by bolts 117.

  A bearing 105 is provided in the bearing housing 106 so as to be interposed between the shaft portion 103 </ b> C and the bearing housing 106, and the bearing 105 is held and fixed in the bearing housing 106 from both ends by the bearing holding lids 107 and 108. ing.

  A stopper 109 is attached to the shaft end of the shaft portion 103 </ b> C, and the bearing 105 is covered with an external lid 110 that prevents intrusion of dust and the like from the outside of the stopper 109.

  The stopper 109 is provided with three fixing bolts 120. The bolts 120 are screwed into screw holes formed in the axial direction of the shaft portion 103C of the rotating shaft 103A to fix the shaft portion 103C and the stopper 109. It is what. Although the screw hole of the shaft portion 103C will be described later, it is used when the joint shaft and the shaft portion 103C are integrated when the bearing assembly 115 is replaced.

  FIG. 2 is a partially enlarged view of the vicinity of the bearing assembly 115 shown in FIG. 1, and the bracket 104 is formed with a circular first positioning projection 118 extending from the surface of the bracket 104 toward the outer side of the rotating shaft 103A. Has been.

  Further, an annular second positioning projection 119 is formed inside the circular projection 118, and the bearing box 106 is fixed by a bolt 117 inside the annular second positioning projection 119. It has become so. Therefore, the positioning projection 119 defines the mounting position of the bearing housing 106.

  As will be described later, in this embodiment, the circular first positioning protrusion 118 and the annular second positioning protrusion 119 define the mounting position of the replacement jig when the bearing assembly 115 is replaced. It is what has.

  Next, an exchange jig used for exchanging the bearing assembly 115 will be described. In this exchange method, two kinds of exchange jigs are used.

  3 and 4 show the first replacement jig 112, which has a cage shape. Specifically, an annular positioning part 121, four support pillars 122A fixed to the annular positioning part 121 at an interval of 90 degrees and planted vertically from the positioning part 121, and a plane in which the support pillars 122A are assembled. The shaft support hole 122C is formed in the portion 122B. As will be described later, the support column 122A extends along the joint shaft during replacement work.

  The shape of the annular positioning portion 121 of the first replacement jig 121 matches the shape of the circular first positioning projection 118 formed on the bracket 104 shown in FIGS. The inner peripheral surface of the annular positioning portion 121 is engaged with the outer peripheral surface of the circular first positioning projection 118.

  The shaft support hole 122C has a function of supporting a joint shaft described later. This will be shown when explaining the method of replacing the bearing assembly.

  Next, FIGS. 5 and 6 show a second replacement jig 113, which is a semicircular jig piece divided into two. Specifically, it is composed of a semicircular support portion 131, a positioning portion 132A projecting outward from the support portion 131, and a shaft portion support hole 132B formed in the center of the support portion 131.

  Further, a bolt insertion hole 133 is formed in the support portion 131, and a fixing bolt equivalent to the bolt 117 for attaching the bearing box 106 is attached to the bolt insertion hole 133. Of course, the fixing bolt 117 can be used.

  Therefore, the shaft part 103C of the rotating shaft 103 is supported by combining the two jig pieces. The two jig shaft pieces can be accommodated in the first exchange jig 112 through a gap between the columns 122A of the first exchange jig, and can be assembled and attached to the bracket 104 in the accommodated state.

  The shape of the positioning portion 132B of the second replacement jig 113 is the same as the shape of the annular second positioning projection 119 formed inside the first positioning projection 118 formed on the bracket 104 shown in FIGS. In other words, the outer peripheral surface of the positioning portion 132B is engaged with the inner peripheral surface of the annular second positioning projection 119.

  Further, the shaft portion support hole 122C has a function of supporting the shaft portion 103C of the rotating shaft 103. This will be shown when explaining the method of replacing the bearing assembly.

  A method of replacing the bearing assembly 115 using the first replacement jig 112 and the second replacement jig 113 having the above-described configuration will be described with reference to FIGS.

  In FIG. 7, when the bearing assembly 115 is replaced, first, the outer lid 110 is removed, and then the fixing bolt 120 is removed, and the stopper 109 is removed from the shaft portion 103C. In this state, the bearing assembly 115 is removable.

  Next, in FIG. 8, the first replacement jig 112 is fixed to the bracket 104. As described above, since the shape of the annular positioning portion 121 of the first replacement jig 121 matches the shape of the circular first positioning protrusion 118, the first replacement jig 112 has the axial center of the rotating shaft 103. The centers of the shaft support holes 122C coincide with each other.

  In this state, the joint shaft 140 (which is also one of the jigs) is passed through the shaft support hole 122C and brought into contact with the end surface of the shaft portion 103C of the rotary shaft 103, and three insertions provided in the axial direction of the joint shaft 140. By inserting a through bolt (not shown) into the hole (not shown) and screwing it into the screw hole of the fixing bolt 120, the joint shaft 140 and the shaft portion 103C can be integrated.

  Here, the diameter of the joint shaft 140 is configured to be substantially the same as or slightly smaller than the shaft portion 103 </ b> C in order to remove the bearing assembly 115. In this state, the rotating shaft 103 is indirectly supported by the shaft support hole 122 </ b> C of the first jig 112.

  Next, in FIG. 9, by removing the fixing bolts of the bearing housing 106 of the bearing assembly 115 from the bracket 104, the bearing assembly 115 becomes free from the bracket 104. As shown in FIG. Can be moved to. Even in this state, the rotating shaft 103 is supported by the first replacement jig 12 by the joint shaft 140.

  Next, in FIG. 10, each jig piece of the second exchange jig 113 is inserted from between the columns 122 </ b> A of the first exchange jig 112, and the shaft portion support hole 132 </ b> B of each jig piece is aligned with the shaft portion 103 </ b> C. The outer periphery of 132B is fixed so as to engage with the inner peripheral surface of the annular second positioning projection 119 formed inside the positioning projection 118 formed on the bracket 104.

  In the present embodiment, the bracket 104 and the second replacement jig 113 are integrated using the fixing bolt 117 through the bolt insertion hole 133 of the support portion 131. Of course, a dedicated bolt different from the fixing bolt 117 may be used.

  In this state, the rotating shaft 103 is supported by the first exchange jig 112 and the second exchange jig 113.

  Next, since the rotary shaft 103 is supported by the second replacement jig 13 in FIG. 11, the first replacement jig 112 can be removed from the bracket 104. Therefore, the bearing assembly 115 can be removed from the joint shaft 140 after the first replacement jig 112 is removed from the bracket 104.

  As a result, the worn or damaged bearing assembly 115 can be removed from the bracket 104 without removing the rotor 103 from the stator frame 101.

  In addition, when attaching the new bearing assembly 115, the operation | work mentioned above should just be performed reversely. That is, the new bearing assembly 115 is inserted into the joint shaft 140, and then the first jig 112 is attached to the bracket 104 and set so as to support the joint shaft 140. Next, the second jig 113 is removed, and the new bearing assembly 115 supported by the joint shaft 140 is moved between the shaft portion 103C of the rotating shaft from which the second jig 113 is removed and the bracket 104, thereby rotating the shaft. A new bearing assembly 115 can be interposed between the shaft portion 103C of the shaft and the bracket 104 for replacement.

  In this way, by using the primary tool 112, the second jig 113, and the joint shaft 140, the bearing assembly 115 is interposed between the bracket 104 and the shaft portion 103C, so that the new bearing assembly 115 is replaced. Can do. According to this, the bearing assembly 115 can be efficiently replaced by using a simple jig.

  Conventionally, in order to replace the bearing assembly, it is necessary to pull out the rotor from the stator frame. However, the rotor is attracted to the stator by the magnetic force of a strong permanent magnet inserted into the rotor and rotates. There was a risk that the child could not be removed. For this reason, a large dismantling device is necessary so that the rotor is not attracted to the stator by the magnetic force of a strong permanent magnet.

  On the other hand, in the present invention, the bearing assembly of the rotating electrical machine can be replaced without requiring a large dismantling device.

  Further, since the replacement work can be performed even in a narrow place, the bearing assembly can be easily replaced even in a narrow vehicle space such as a generator of a diesel locomotive.

  DESCRIPTION OF SYMBOLS 101 ... Stator frame part, 102 ... Stator, 103 ... Rotor, 104 ... Bearing bracket part, 105 ... Bearing part, 106 ... Bearing box, 107, 108 ... Bearing holding lid, 109 ... Stopper, 110 ... External lid, DESCRIPTION OF SYMBOLS 111 ... Coupling, 112 ... 1st exchange jig, 113 ... 2nd exchange jig, 121 ... Positioning part, 122A ... Column, 122C ... Shaft support hole, 131 ... Support part, 132B ... Shaft support hole, 140 ... Joint shaft .

Claims (4)

A stator arranged inside the stator frame, a rotor arranged inside the stator frame, a bearing bracket fixed to the stator frame and through which a rotation shaft of the rotor is inserted, and the bearing bracket And a rotating electrical machine comprising a bearing assembly provided between the rotating shafts,
Fixing a joint shaft to an end of the rotating shaft, and fixing a first jig for supporting the joint shaft to the bearing bracket;
Removing the bearing assembly from the bearing bracket in a state where the joint shaft is supported by the first jig;
Fixing a second jig supporting the rotating shaft from which the bearing assembly is removed to the bearing bracket;
Removing the bearing assembly and the first jig in a state where the rotating shaft is supported by the second jig;
Thereafter, a new bearing assembly and the first jig are inserted into the joint shaft, and the joint shaft is supported by the first jig.
The rotation is characterized in that the second jig is removed while the joint shaft is supported by the first jig, and the new bearing assembly is interposed between the bearing bracket and the rotating shaft. How to replace the bearing part of an electric machine. In the exchange jig used for the exchange method of the bearing part of the rotation electrical machinery according to claim 1,
The first jig joins the positioning portion that matches the shape of the positioning projection formed on the bearing bracket, the flat portion on which the shaft support hole for supporting the joint shaft is formed, and the positioning portion and the flat portion. An exchange jig comprising a plurality of struts extending along the joint shaft. In the exchange jig used for the exchange method of the bearing part of the rotation electrical machinery according to claim 1,
The second jig has a positioning portion that matches the shape of the second positioning protrusion formed inside the first positioning protrusion formed on the bearing bracket, and a shaft portion support hole that supports the rotating shaft. An exchange jig characterized in that the exchange jig is composed of a two-piece jig piece having a formed support portion. In the exchange jig used for the exchange method of the bearing part of the rotation electrical machinery according to claim 1,
The first jig joins the positioning portion that matches the shape of the positioning projection formed on the bearing bracket, the flat portion on which the shaft support hole for supporting the joint shaft is formed, and the positioning portion and the flat portion. It is composed of a plurality of struts extending along the joint shaft,
The second jig has a positioning portion that matches the shape of the second positioning protrusion formed inside the first positioning protrusion formed on the bearing bracket, and a shaft portion support hole that supports the rotating shaft. Consists of two-piece jig pieces having a formed support,
The jig piece constituting the second jig is housed in the first jig from between the columns provided in the first jig, and the second jig piece is assembled. Jig.

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