JP3201028U - Bearing extraction jig - Google Patents

Abstract

A bearing is pulled out while preventing damage to the bearing and the like. A bearing extraction jig 200 for extracting an outer race on which a roller array is held slides into a core member 210 having an outer diameter smaller than the inner diameter of the roller array and a radial guide hole 211 formed in the core member 210. A claw member 212 that is movably inserted and abuts against the axial end surface of the outer race when the tip protrudes from the guide hole; a coil spring 214 (biasing member) that urges the claw member 212 in the radial direction; A push bolt 216 (fixing member) that fixes the member 212 at a position where the tip portion does not protrude from the guide hole 211 is provided. [Selection] Figure 3

Description

  The present invention relates to a bearing extracting jig used for extracting an outer race of a bearing from a bearing mounting hole.

  As a jig for extracting the outer race (C) of the bearing press-fitted into the bearing mounting hole (B), for example, an inner adapter member (2) inserted inside the outer race (C) and a concentric relative thereto Inner end face of outer race (C) held in a freely swingable manner between outer adapter member (3), which is rotatably mounted, and outer peripheral recess (2F) and inner peripheral recess (3C) formed in these The thing provided with the several engagement hook member (4) which can be engaged / disengaged to (C1) is known (for example, refer patent document 1).

JP 2001-287171 A

  The extraction jig constituted by the inner adapter member, the outer adapter member, and the engaging hook member as described above forms a recess in the inner adapter or the outer adapter, or swings the engaging hook member to engage with the outer race. In order to form a shape to be combined, a relatively complicated cutting process or the like is required. For this reason, it is difficult to produce a high-precision jig, and in particular when the size of the bearing is large, the bearing can be pulled out while reliably preventing damage to the bearing and the member to which the bearing is mounted. It was difficult to make it difficult.

  The present invention has been made in view of such a point, and an object of the present invention is to enable easy removal of the bearing while reliably preventing damage to the bearing and a member to which the bearing is mounted.

The first idea is
A bearing extraction jig used for the operation of extracting the outer race holding the roller row from the bearing mounting hole,
A core member having an outer diameter smaller than the inner diameter of the roller row;
A claw member that is slidably inserted into a radial guide hole formed in the core member, and that can contact the axial end surface of the outer race of the bearing when the tip projects from the guide hole;
A biasing member that biases the claw member in a radial direction;
A fixing member for fixing the claw member at a position where the tip portion does not protrude from the guide hole;
It is provided with.

  Thus, after inserting the core member into which the claw member has been pushed into the guide hole into the outer race and the roller row, the claw member is protruded and brought into contact with the end surface of the outer race, thereby reliably damaging the bearing and the like. The bearing can be extracted while preventing.

The second idea is
A bearing extraction jig of the first device,
The guide hole is formed by welding an embedding member having a shape filling the space between the guide holes in an annular groove formed between a pair of disk-like portions joined by a shaft portion. It is characterized by that.

The third idea is
A bearing extraction jig of the second device,
After the embedded member is welded, the outer peripheral surface of the new member is cut by a lathe.

  Accordingly, the clearance between the guide hole and the claw member can be set appropriately, or the outer diameter accuracy of the core member can be increased.

The fourth idea is
Any one of the first to third devices is a bearing extracting jig,
Projecting members that project in the axial direction are provided on both axial sides of the core member.

The fifth idea is
A bearing extraction jig according to a fourth device,
One of the overhang members is a shaft member capable of applying a force for pushing the core member in the axial direction,
The other overhang member is a handle portion capable of supporting the weight of the core member.

  Accordingly, it is possible to easily insert the bearing extraction jig into the outer race of the bearing.

The sixth idea is
Any one of the first to third devices is a bearing extracting jig,
The fixing member is a push bolt that holds the claw member in a position where it is pushed into the guide hole.

  Thereby, it is possible to easily insert the bearing extraction jig while preventing damage to the roller of the bearing.

  According to the present invention, the bearing can be easily extracted while reliably preventing damage to the bearing and the member to which the bearing is mounted.

It is a longitudinal cross-sectional view which shows the example of the roll apparatus from which a bearing is extracted by the bearing extraction jig | tool of embodiment. It is a cross-sectional view of the outer ring of the roll device. It is a perspective view which shows the structure of the bearing extraction jig | tool of embodiment. It is a longitudinal cross-sectional view which shows the structure of the principal part of the bearing extraction jig | tool of embodiment. It is a cross-sectional view which shows the structure of the principal part of the bearing extraction jig | tool of embodiment. It is explanatory drawing which shows the state which extracts the outer race of a bearing using the bearing extraction jig | tool of embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Structure of backup roll 100)
First, a backup roll 100 as an example of a member on which a bearing extracted by a bearing extraction jig is mounted will be described with reference to FIGS. 1 and 2. This backup roll 100 is used to support the pressing force of the work roll that is in direct contact with the steel sheet in a device for correcting the distortion of the steel sheet. A pair of backup rolls 100 is provided between the cylindrical roll 110 and the roll shaft 120. The roller bearing 130 is provided. Each of the roller bearings 130 is configured such that, for example, two rows of rollers 133 are held by a cage 134 between an inner race 131 and an outer race 132.

  In the vicinity of the central portion on the inner peripheral side of the roll 110, an outer race abutting portion 110a with a small inner diameter and abutting the axial end surface of the outer race 132 is formed. The outer race abutting portion 110a is formed with notches 110b at equal intervals in the circumferential direction, so that the hook allowance of the claw member 212 in the bearing extraction jig 200 described later to abut on the outer race 132 can be increased. .

  In the backup roll 100 as described above, it is relatively easy to extract the roll shaft 120 and the inner race 131, but it is difficult to extract the outer race 132 from the roll 110. This is because the outer races 132 of the pair of roller bearings 130 arranged in the axial direction must be extracted from the central portion in the axial direction toward both ends, and for that purpose, a portion having an outer diameter larger than the inner diameter of the outer race 132 is required. This is because it is necessary to insert a jig having a gap between the two outer races 132.

(Structure of bearing extraction jig 200)
Hereinafter, a bearing extraction jig 200 that can be used to extract the roller bearing 130 attached to the backup roll 100 as described above will be described with reference to FIGS.

  The bearing extraction jig 200 includes a cylindrical core member 210, push rod portions 220 provided on both sides in the axial direction, and a handle portion 230. The outer diameter of the core member 210 is set slightly smaller than the inner diameter of the row of rollers 133 held by the cage 134 in the roller bearing 130. The core member 210 is formed with four rectangular guide holes 211 arranged at equal intervals in the circumferential direction, and a claw member 212 that is slidably guided in the radial direction is provided therein. . The claw member 212 is biased toward the outer peripheral side by a coil spring 214 attached to the spring receiving hole 213. Further, the claw member 212 resists the urging force of the coil spring 214 by, for example, a hexagon socket head cap screw 216 being screwed into a bolt hole 215 formed on the axial end surface of the core member 210. It can be fixed at a position that does not protrude beyond the outer diameter of the.

  The method of forming the guide hole 211 of the core member 210 as described above is not particularly limited. For example, as shown in FIG. 4, an annular shape between a pair of disk-shaped portions arranged at predetermined intervals in the axial direction After the embedded member 217 having a fan-shaped cross-sectional shape as shown in FIG. 5 and having a groove 217a is welded to the groove, the outer diameters of the core member 210 and the embedded member 217 are cut by a lathe. Has been formed. Accordingly, the clearance between the guide hole 211 and the claw member 212 is appropriately set, and the core member 210 and the embedded member 217 are held by the cage 134 in the roller bearing 130 so as to have a predetermined outer diameter accuracy. Thus, the core member 210 can be easily inserted without damaging the roller 133.

(How to extract the roller bearing 130)
An example of an operation of extracting the roller bearing 130 from the backup roll 100 using the bearing extraction jig 200 as described above will be described.

  First, the roll shaft 120 is pushed out by a hydraulic jack or the like, and is extracted from the backup roll 100, and the inner race is also removed.

  Next, the backup roll 100 is mounted on a roller mounting table 300 as shown in FIG. The roller mounting base 300 includes, for example, a flat base plate 301, a roller support portion 302 provided near both ends of the upper surface thereof, and a hydraulic jack support portion 303. The roller support portion 302 is composed of a pair of plate members arranged in a direction perpendicular to the paper surface of FIG. 6, and regulates the movement of the roll 110 of the backup roll 100. Further, the hydraulic jack support portion 303 regulates the movement of the cylinder 311 of the hydraulic jack 310.

  On the other hand, the bearing extraction jig 200 inserts the core member 210 into the backup roll 100 in a state where the claw member 212 is pushed into the guide hole 211 and fixed by the push bolt 216 as described above. At this time, by supporting the core member 210 with the push rod portion 220 and the handle portion 230, it is possible to easily insert the core member 210 while preventing damage to the roller 133 and the like of the roller bearing 130. When the claw member 212 reaches the position of the outer race contact portion 110a of the roll 110, that is, the position between the pair of outer races 132, the push bolt 216 is loosened, so that the claw member 212 is radiated in the radial direction by the biasing force of the coil spring 214. Can jump out to the outer race 132. Further, at this time, the engagement position between the claw member 212 and the outer race 132 is increased by making the position of the bearing extraction jig 200 in the rotation direction correspond to the position of the notch 110b of the outer race contact portion 110a. be able to.

  Next, the hydraulic jack 310 is attached between the push rod portion 220 of the bearing extraction jig 200 and the hydraulic jack support portion 303 of the roller mounting table 300. More specifically, the cylinder 311 of the hydraulic jack 310 is in contact with the hydraulic jack support portion 303, and the piston 312 is in contact with the push rod portion 220 of the bearing extraction jig 200. Therefore, by extending the piston 312 of the hydraulic jack 310, the operating force of the hydraulic jack 310 is uniformly applied to the four locations of the outer race 132 of the one roller bearing 130, and is extracted from the roll 110 together with the roller 133 and the cage 134. be able to. The force required at this time can be quite large, but the jig 200 does not move in an unexpected direction and does not damage the bearings, rolls, and the like. This is because the core member 210 is kept within the bearing roller 133 with an appropriate clearance, thereby enabling only the bearing to be stably pushed out. In addition, the backup roll 100 can be reversed in the axial direction and placed on the roller mounting table 300, and the outer race 132 of the other roller bearing 130 can be similarly extracted.

  As described above, after inserting and removing the claw member 212 and inserting it into the roll 110, the outer race 132 is pulled out while reliably preventing damage to the roller bearing 130 and the like by contacting the end surface of the outer race 132. be able to. In particular, since the strength of the claw member 212 can be easily increased, it is easy to extract even a bearing having a high load capability such as a double row bearing in which a plurality of rollers 133 are provided as described above or a bearing having a long roller 133. It is possible to easily reduce the working time.

(Other matters)
In the above example, the backup roll 100 of the apparatus for correcting the distortion of the steel sheet has been described as the member for extracting the bearing by the bearing extracting jig 200. However, the apparatus in which the bearing extracting jig 200 is used is particularly limited. is not.

  Also, the type of bearing is not limited to the double row roller bearing 130 as described above, but can be similarly used for various bearings.

  Further, the bearing extraction jig 200 is not pushed by the hydraulic jack 310, but a pulling force may be applied by the hydraulic cylinder. In this case, for example, a bearing mounted in a blind hole can be pulled out.

  Further, the number of the claw members 212 provided on the core member 210 is not limited to four, and may be set as appropriate according to the size of the roller bearing 130 and the force required for extraction.

  Further, although it is not always necessary to provide the push rod portion 220, it is sufficient if the force of the hydraulic jack 310 can be applied to the core member 210. However, if the push rod portion 220 is provided, the axial direction of the backup roll 100 can be increased. Since force can be applied to the push rod portion 220, the degree of freedom of the drive device such as the hydraulic jack 310 can be increased.

  Further, by providing the handle portion 230 and the push rod portion 220 on the core member 210, the bearing extraction jig 200 can be supported from both sides in the axial direction of the backup roll 100, so that the bearing extraction jig 200 can be easily inserted and positioned. Can be. A member similar to the handle portion 230 may be provided on both sides of the core member 210.

  Further, by providing the notch 110b in the outer race contact portion 110a formed between the two roller bearings 130 in the roll 110, the allowance between the claw member 212 and the outer race 132 can be increased. In the case where a sufficient extraction force can be applied, the notch 110b as described above is not necessarily provided.

DESCRIPTION OF SYMBOLS 100 Backup roll 110 Roll 110a Outer race contact part 110b Notch 120 Roll shaft 130 Roller bearing 131 Inner race 132 Outer race 133 Roller 134 Cage 200 Bearing extraction jig 210 Core member 211 Guide hole 212 Claw member 213 Spring receiving hole 214 Coil spring 215 Bolt hole 216 Push bolt 217 Embedded member 217a Groove 220 Push rod portion 230 Handle portion 300 Roller mounting base 301 Base plate 302 Roller support portion 303 Hydraulic jack support portion 310 Hydraulic jack 311 Cylinder 312 Piston

Claims (6)

A bearing extraction jig used for the operation of extracting the outer race holding the roller row from the bearing mounting hole,
A core member having an outer diameter smaller than the inner diameter of the roller row;
A claw member that is slidably inserted into a radial guide hole formed in the core member, and that can contact the axial end surface of the outer race of the bearing when the tip projects from the guide hole;
A biasing member that biases the claw member in a radial direction;
A fixing member for fixing the claw member at a position where the tip portion does not protrude from the guide hole;
A bearing extraction jig characterized by comprising: The bearing extraction jig according to claim 1,
The guide hole is formed by welding an embedding member having a shape filling the space between the guide holes in an annular groove formed between a pair of disk-like portions joined by a shaft portion. A bearing extraction jig characterized by that. The bearing extraction jig according to claim 2,
A bearing extraction jig, wherein an outer peripheral surface of a new member is cut by a lathe after the embedded member is welded. A bearing extraction jig according to any one of claims 1 to 3,
A bearing extracting jig, characterized in that an extending member extending in the axial direction is provided on both axial sides of the core member. The bearing extraction jig according to claim 4,
One of the overhang members is a shaft member capable of applying a force for pushing the core member in the axial direction,
The other overhang member is a handle portion that can support the weight of the core member. A bearing extraction jig according to any one of claims 1 to 5,
The bearing extracting jig, wherein the fixing member is a push bolt that holds the claw member at a position where the claw member is pushed into the guide hole.

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