JP2006239804A - Drawing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drawing device, preventing a holding member for holding the end face of a drawing material from being detached from the drawing material not to cause damage of the device at the time of drawing the drawing material such as an inner ring or a collar of a bearing pressed in or shrinkage-fitted to a material to be drawn such as a shaft. <P>SOLUTION: This drawing device includes: a first connecting disc 5 to which a hydraulic device 9 is connected; a second connecting disc 6 connected to the first connecting disc 5 at predetermined spaces by a plurality of bolts 7; a cylindrical holding part formed of a lower holding part 42 and an upper holding part 43 which are respectively semi-cylindrical; an insert part 13 provided in the central part of the disc surface of the second connecting disc 6 to insert a member to be drawn; a locking groove 4a provided in the holding part, in which the circumferential part of the second connecting disc 6 is locked; and a locking part 12 provided on the holding part, in which the drawing member is locked, wherein the member to be drawn is pressed by a piston rod of the hydraulic device 9 to draw the drawing member locked on the locking part 12from the member to be drawn. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a novel pulling device for pulling out an inner ring or collar of a bearing press-fitted or shrink-fitted into a shaft from the shaft.

  When disassembling the rotor of a rotating electrical machine during periodic inspection or repair of a rotating electrical machine such as an electric motor or generator used in various mechanical equipment, a bearing (ball bearing) that is integrated into the shaft by press fitting or shrink fitting , Roller bearings, etc.). In this electric motor, a general structure is such that an outer ring of a bearing is fitted into a housing and an inner ring is press-fitted or shrink-fitted into a shaft. After removing the housing and exposing the bearing, it is easy to remove the ball or roller and the outer ring, but the inner ring is firmly fitted to the shaft, so the inner ring is not deformed and is not damaged. In order to remove it, it is necessary to use a drawing device.

  As a conventional drawing device of this type, a method of combining a hydraulic device is widely adopted, but a holding member that holds the end face of the inner ring is a disk that is bolted with a half disk facing each other, and this disk and The structure is such that the disk connected to the hydraulic system is bolted, so that when the inner ring is pulled out, an equal force is not applied to the entire surface of the disk in the axial direction against the half disk, and the joint between the half disks is at the junction. There was a problem that excessive stress was applied, the half disk was detached from the end face of the inner ring, and the fastening bolt was broken.

  In addition, since the electric motor has various sizes and the shaft diameter, the bearing size, the distance from the shaft end surface to the bearing, and the like are different, it is necessary to prepare a dedicated drawing device.

  Further, Patent Document 1 proposes a drawing device that combines a high-frequency heating device and a hydraulic device as a device that pulls out an inner ring of a bearing fitted to a hollow shaft of a track vehicle or the like. In the cited document 1, since the inner ring fitted to the hollow axle can be effectively heated by the high frequency heating device, it can be effectively pulled out from the axle. However, when the hollow axle is large, or when the motor is a solid shaft, the inner ring cannot be heated effectively, and it is difficult to perform the drawing operation, which is the same as the conventional drawing device described above. In addition, since the holding member that holds the end face of the inner ring is a disk that is bolted with the half disk facing each other, an equal force is not applied to the half disk, and excessive stress is applied to the joint of the half disk As a result, there is a problem that the half disk is detached from the end face of the inner ring or the fastening bolt is broken.

JP-A-8-150524

  The object of the present invention is to prevent the holding member that holds the end surface of the drawing material from coming off from the drawing material when drawing the drawing material such as the inner ring of the bearing or the collar press-fitted or shrink-fitted into the drawing material such as the shaft. Another object of the present invention is to provide a drawing device that can be pulled out with a simple operation without causing damage to the device.

  The present invention includes a first coupling disk to which a hydraulic device is coupled, a second coupling disk coupled to the first coupling disk by a plurality of bolts at a predetermined interval, and each of which is a semi-cylindrical shape. A cylindrical holding portion formed by integrally coupling the side holding portion and the upper holding portion, an insertion hole for inserting a member to be pulled out provided in a central portion of the disk surface of the second connecting disc, A member having a locking groove for locking the circumferential portion of the second connecting disk provided in the holding portion, and a locking portion for locking the pulling member provided in the holding portion; Is pulled out by the piston rod of the hydraulic device, and the pulling member locked to the locking portion is pulled out from the pulled member.

  The drawing device of the present invention has an adapter serving as a spacer at at least one end of the piston rod and the drawn member, the drawn member is a shaft constituting a rotor of a rotating electrical machine, and the drawn member is the An inner ring or collar of a bearing press-fitted or shrink-fitted into a shaft, and a male screw provided in the hydraulic device on the female screw, the female screw having a female screw that connects the hydraulic device to the center of the disk surface of the first connecting disk It is preferable to have at least one of screwing and fixing.

  According to the present invention, when pulling out a drawing material such as an inner ring or collar of a bearing press-fitted or shrink-fitted into a drawing material such as a shaft, the holding member that holds the end surface of the drawing material does not come off from the drawing material. Also, it is possible to provide a drawing device that can be pulled out with a simple operation without causing damage to the device.

  The best mode for carrying out the present invention will be described below in detail with reference to the accompanying drawings.

  FIG. 1 is an exploded perspective view showing a principle structure of a drawing apparatus according to the present invention. As shown in FIG. 1, the drawing device according to the present invention has a first connecting disk 5 and a second connecting disk 6 connected by a predetermined distance L and four bolts 7 between them. The connecting disk 5 is integrated with a fixed side of the hydraulic device 9 and is composed of a lower holding part 42 and an upper holding part 43 having a half-cylindrical half structure, and has a holding part 4 for holding a drawing material. The holding portion 4 is formed with locking grooves 4a into which the outer peripheral portion of the second connecting disk 6 is inserted and fixed at positions corresponding to the lower holding portion 42 and the upper holding portion 43, respectively. The holding portion 42 and the upper holding portion 43 are combined to form a ring shape, and a male screw is inserted into the play hole 43a and is fastened and integrated by screwing into the female screw hole 42a. The play holes 43a and the female screw holes 42a are provided on both sides on the locking portion 12 side described later.

  When pulling out the inner ring 2a fitted to the shaft 1 that is the material to be pulled, the shaft 1 is sandwiched between the semi-cylindrical lower holding portion 42 and the upper holding portion 43 to form the cylindrical holding portion 4. Keep it integrated.

  The lower holding portion 42 and the upper holding portion 43 are latched by semi-ring-shaped protrusions that are fixed when the inner ring 2a and the collar 3 of the bearing 2 as the drawing material shown below are pulled out from the shaft 1 of the drawn material. The locking portion 12 has a shape inclined from the semi-cylindrical body portion having the portion 12 and the locking groove 4a to the semiconical shape.

  FIG. 2 is a side sectional view showing a part of an electric motor rotor in which a bearing and a collar are mounted on a solid shaft. The inner ring 2a and the collar 3 of the bearing 2 shown in FIG. 2 can be pulled out by the pulling device of the present invention.

  The ball bearing 2 includes an inner ring 2a, a ball 2b, and an outer ring 2c, and the inner ring 2a is press-fitted or shrink-fitted into the shaft 1. The outer diameter of the outer ring 2c is fitted in the housing HG of the electric motor so that the shaft 1 can rotate. A rotating device (not shown) such as a blower is coupled to the screw portion 1a. The collar 3 is press-fitted to the shaft 1, and a labyrinth portion 3b formed on one wall surface is opposed to the labyrinth portion 3b of the housing HG through a gap.

  FIG. 3 is a cross-sectional view showing a drawing device according to the present invention showing a situation where the inner ring of the motor rotor is drawn from the shaft. The housing HG is removed from the motor rotor shown in FIG. 2, the ball 2b is extracted, and the outer ring 2c is removed. Then, after leaving only the inner ring 2a of the bearing 2 on the shaft 1, a method of pulling out the inner ring 2a using the pulling device of the present invention will be described below.

  A male screw 9 a is provided on the fixed side of the hydraulic device 9, and the first connecting disk 5 and the hydraulic device 9 are integrated by screwing into a female screw provided on the first connecting disk 5. The female thread portion provided on the first coupling disk 5 is formed thicker than the coupling portion of the bolt 7 and has a ring-shaped projection that serves as a stopper for the hydraulic device 9. It has a gap that allows the female thread to escape. This thick wall increases the coupling force between the first connecting disk 5 and the hydraulic device 9.

  The first connecting disk 5 and the second connecting disk 6 are fastened by bolts 7 at a predetermined interval. Both of the first connecting disks 5 are carried out by nuts 8b and 8c through washers 18, and the second connecting disk 6 is screwed with a male screw of a bolt 7 into a penetrating female screw provided therein, and a washer by a nut 8a. 18 is fixed.

  When the hydraulic pressure is applied from the hydraulic pressure introduction base 9d, the piston rod 9c is pushed leftward. A first adapter 10 is inserted and fixed as a spacer on the front end side of the piston rod 9c so that the second adapter 11 can contact with the right end of the shaft 1 as a spacer. After the application of the oil pressure from the oil pressure introduction base 9d is completed, the piston rod 9c to which the oil pressure is applied from the oil introduction base 9b is returned to the right.

  The first adapter 10 and the second adapter 11 are spacers, but are also in a block shape for preventing deformation of both the piston rod 9c and the shaft 1 due to mutual pressing. The first adapter 10 has a recess formed along the tip shape of the piston rod 9c, and is mounted by fitting. The second adapter 11 has a female thread formed on a threaded portion 1a having a male thread formed at the end of the shaft 1 and is not attached to the threaded portion 1a of the shaft 1 so that a pressing force against the male screw is not applied. It comes to contact.

  The semi-cylindrical lower holding part 42 and the upper holding part 43 are aligned so as to sandwich the shaft 1, and the second connecting disk 6 is coupled to and integrated with the holding part 4 formed in a cylindrical shape. Next, the left side of the bolt 7 is screwed into a female screw 15 provided on the second connecting disk 6 and locked with a nut 8a. And after making the right side of the volt | bolt 7 penetrate the bolt insertion hole 16 provided in the 1st connection disk 5, nuts 8b and 8c are clamp | tightened and couple | bonded. This completes the preparation for the drawing operation. The four bolts 7 are arranged symmetrically with respect to the first connecting disk 5 and the second connecting disk 6, but the number of bolts 7 is set as necessary. The holding part 4 formed in a cylindrical shape has an inner diameter smaller than the outer diameter of the inner ring 2a of the bearing, and a ring-shaped locking part 12 slightly larger than the outer diameter of the shaft 1 is formed. The inner ring 2a is fixed and can be pulled out.

  When a hydraulic pressure is applied to the hydraulic pressure introduction base 9b, the piston rod 9c is pushed leftward, the end surface of the first adapter 10 comes into contact with the end surface of the second adapter 11, and the two stick together. For this reason, an axial force pushed rightward is applied to the left end surface of the inner ring 2a via the first connecting disk 5, the bolt 7, the second connecting disk 6, and the holding portion 4. The inner ring 2a can be pulled out by increasing the hydraulic pressure so that a force stronger than the fitting force press-fitted or shrink-fitted into the shaft 1 is applied.

  According to the present embodiment, the second connecting disk 6 is joined to the locking groove 4a of the lower holding part 42 and the upper holding 43, and this is connected to the first connecting disk 5 with the bolt 7, so that during the pulling operation Since the outer peripheral portion of the second coupling disk 6 is inserted and fixed to the holding portion 4 as a whole, an axial force is uniformly applied, and the second coupling disk 6 is not detached from the holding portion 4. Further, since the ring-shaped locking portion 12 is integrally formed by the body portion of the holding portion 4, the locking portion 12 is not deformed, and therefore the inner ring 2 a is not detached from the locking portion 12. Further, the connecting bolt 7 is not broken.

  In addition, according to the present embodiment, the apparatus can be easily mounted on the drawing material, and the distance L can be set constant without using a heating apparatus that has been conventionally used. Pulling out the inner ring 2a and collar 3 fitted on different shafts can be handled only by changing the shape of the holding part, and the parts that make up the pulling device can be greatly shared, and there are many types of rotors with fewer types. Can be supported.

  Further, when the fitting position of the inner ring 2a is far from the end surface of the shaft 1, there may be a case where a space for mounting the first adapter 10 may not be taken. In this case, the end surface of the piston rod 9c is the end surface of the shaft 1. Set to abut. Alternatively, only the second adapter 11 may be attached and the first adapter 10 may not be attached, and any form corresponding to the specification of the shaft 1 can be adopted.

  In the present embodiment, an example in which the inner ring of the motor rotor is pulled out from the shaft has been shown. However, the present invention can also be used as a pulling-out device that pulls out the inner ring of a bearing fitted to a hollow shaft of a track vehicle or the like.

  FIG. 4 is a cross-sectional view showing a drawing device according to the present invention showing a situation where the collar of the motor rotor is drawn from the solid shaft. After the inner ring 2a shown in the first embodiment is pulled out, the ring-shaped locking portion 12 formed by the holding portion 14 is held in the axial direction longer than that in FIG. Part 14 is used. The distance L from the left end of the first connecting disk 5 to the right end of the second connecting disk 6 is set to be the same as in the first embodiment so that the same parts as in FIG. Things are used. The pull-out operation of the collar 3 is performed in the same manner as the inner ring 2a. The holding portion 14 is formed in a ring shape by combining the lower holding portion and the upper holding portion in the same manner as in the first embodiment, and is fastened and integrated by inserting a male screw into the play hole and screwing into the female screw hole. Is done. The play holes and the female screw holes are provided on both sides on the locking portion 12 side.

  Also in the present embodiment, as in the first embodiment, the second connecting disk 6 does not come off from the holding portion 14. In addition, since the ring-shaped locking portion 12 is integrally formed by the body portion, the locking portion 12 is not deformed, so that the locking groove 3a of the collar 3 is detached from the locking portion 12, or for connection. The bolt 7 is not broken, and the same effect as in the first embodiment can be obtained.

  Also in this embodiment, the setting may be such that the end surface of the piston rod 9c contacts the end surface of the shaft 1, or only the second adapter is mounted and the first adapter is not mounted. Arbitrary forms corresponding to the specifications can be adopted, and further, by setting the distance L constant, it is possible to respond to the shafts with different specifications only by changing the shape of the holding part, and the pulling device is configured. The parts to be used can be greatly shared.

  FIG. 5 is a cross-sectional view showing a drawing device according to the present invention showing a situation in which an inner ring of an electric motor rotor is drawn from a solid shaft. When the inner ring 2a is fitted near the end face of the shaft 1 and no threaded portion is formed on the right end face of the shaft 1, the first adapter 20 is axially moved from the first embodiment without changing the distance L. The length of the holding portion 17 is made shorter than that of the first and second embodiments so as to make it longer and come into contact with the end face of the shaft 1. The distance L from the left end of the first connecting disk 5 to the right end of the second connecting disk 6 is set to be the same as in the first embodiment so that the same parts as in FIG. Things are used. The procedure for the drawing operation can be performed in the same manner as in the first embodiment. The holding part 17 has the same structure as that of the first embodiment.

  Also in the present embodiment, as in the first embodiment, the second connecting disk 6 does not come off from the holding portion 17. Further, since the ring-shaped locking portion 12 is integrally formed by the body portion, the locking portion 12 is not deformed, so that the inner ring 2a is detached from the locking portion 12 or the connecting bolt 7 is broken. The effect similar to Example 1 is acquired.

  Also in this embodiment, the setting may be such that the end surface of the piston rod 9c contacts the end surface of the shaft 1, or only the second adapter is mounted and the first adapter is not mounted. Arbitrary forms corresponding to the specifications can be adopted, and further, by setting the distance L constant, it is possible to respond to the shafts with different specifications only by changing the shape of the holding part, and the pulling device is configured. The parts to be used can be greatly shared.

It is a disassembled perspective view which shows the structure of the drawing apparatus which concerns on this invention. It is a sectional side view of an electric motor rotor with which a bearing and a collar were attached to a shaft. It is a sectional side view which shows the extraction state of an inner ring | wheel with the extraction apparatus which concerns on this invention. It is a sectional side view which shows the color drawing-out state by the drawing-out apparatus which concerns on this invention. It is a sectional side view which shows the extraction state of an inner ring | wheel with the extraction apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Shaft, 2 ... Bearing, 2a ... Inner ring, 3 ... Collar, 4, 14, 17 ... Holding part, 4a ... Locking groove, 5 ... First connection disk, 6 ... Second connection disk, 7 ... Bolt 8a, 8b, 8c ... nut, 9 ... hydraulic device, 9a ... male screw, 9b, 9d ... base, 9c ... piston rod, 10, 20 ... first adapter, 11 ... second adapter, 12 ... locking part , 13 ... insertion hole, 15 ... female screw, 16 ... bolt insertion hole, 18 ... washer, 42 ... lower holding part, 42a ... female screw hole, 43 ... upper holding part, 43a ... play hole.

Claims (4)

  A first coupling disk to which a hydraulic device is coupled; a second coupling disk coupled to the first coupling disk by a plurality of bolts at a predetermined interval; and a lower holding portion each having a semi-cylindrical shape; A cylindrical holding portion integrally formed by the upper holding portion, an insertion hole for inserting a member to be pulled out provided in a central portion of the disk surface of the second connection disk, and a circumference of the second connection disk A locking groove provided in the holding part for locking the part, and a locking part provided in the holding part for locking the pull-out member, and the member to be pulled out by a piston rod of the hydraulic device. A pulling device, wherein the pulling member pressed and pulled out by the locking portion is pulled out from the pulled member.   2. The drawing apparatus according to claim 1, further comprising an adapter serving as a spacer at a tip of at least one of the piston rod and the drawn member.   3. The extraction according to claim 1, wherein the member to be extracted is a shaft constituting a rotor of a rotating electric machine, and the extraction member is an inner ring or a collar of a bearing press-fitted or shrink-fitted into the shaft. apparatus. 4. The method according to claim 1, further comprising: a female screw that connects the hydraulic device to a central portion of the disk surface of the first connecting disk, and a male screw provided in the hydraulic device is screwed and fixed to the female screw. A drawing device characterized by that.

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