Plummer block

Abstract

To provide a plummer block capable of easily being changed to specifications in which it can be attached to an external structure.SOLUTION: A plummer block comprises a bearing and a bearing box housing the bearing, where the bearing box is attached to an external structure via an attachment structure. The attachment structure comprises a bolt member, and an attachment that is detachably attached to an attachment hole formed in the bearing box. The attachment has an insertion hole through which the bolt member is inserted and which protrudes outward from the bearing box, and an external protrusion part of the bolt member that protrudes outward through the insertion hole is fastened to the structure.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a plasma block including a bearing and a bearing housing that supports the bearing.

Background Art

[0002] As plasma blocks, there are those described in Patent Document 1 and Patent Document 2 in the prior art. In general, a plasma block includes a rolling bearing that rotatably supports a shaft and a bearing housing that houses this rolling bearing. A conventional general bearing housing 1 is shown in FIGS. 9 and 10.

[0003] As shown in FIG. 9, the conventional bearing housing 1 has an upper housing 1A above and a lower housing 1B below. The upper housing 1A and the lower housing 1B above and below are combined. Note that the upper housing 1A and the lower housing 1B are connected and integrated via a bolt member 2. The bolt member 2 includes a head 2a and a shaft portion having a male screw portion. That is, an insertion hole through which the shaft portion of the bolt member 2 is inserted is provided in the upper housing 1A, and a screw hole (female screw hole) is provided in the lower housing 1B. For this reason, the male screw portion of the shaft portion of the bolt member 2 protruding from the upper housing 1A through the insertion hole of the upper housing 1A is screwed into the screw hole of the lower housing 1B. Thereby, the upper housing 1A and the lower housing 1B are integrated.

[0004] Also, the lower housing 1B is attached to an external structure K (for example, a pedestal). In this case, a base portion 3 having a rectangular shape in plan view is provided in the lower housing 1B, and the lower housing 1B is fixed to the base portion 3 by an attachment structure 6 (6A, 6B) having a bolt member 5 to be attached. In those shown in FIGS. 9 and 10, a screw hole 8 is provided in a corresponding portion of the pedestal K corresponding to one end portion of the base portion 3, and a through hole 7 is provided in one end portion of the base portion 3 so as to face the screw hole 8. For this reason, in one attachment structure 6A, the screw shaft portion of the bolt member 5 is inserted through the through hole 7 of the outer flange portion 3, and the male screw portion of the screw shaft portion is screwed into the screw hole (female screw portion) 8 of the pedestal K.

[0005] On the other hand, a through hole 9 is provided in the corresponding portion of the pedestal K corresponding to the other end of the base portion 3, and a through hole 7 is provided in the other end of the base portion 3 facing the through hole 9. Therefore, the threaded shaft portion 5b of the bolt member 5 is inserted through the through hole 9 and the through hole 7 from the pedestal side, the male thread 5b1 of the threaded shaft portion 5b of the bolt member 5 is projected upward, and a nut member 10 is screwed onto the male thread 5b1. In the attachment structure 6A, a threaded hole 8 was provided on the pedestal side, and the male threaded portion of the threaded shaft portion of the bolt member 5 was screwed into the threaded hole 8 of the pedestal K. However, instead of the threaded hole 8 on the pedestal side, a through hole may be provided, and a nut member may be screwed onto the male threaded portion of the threaded shaft portion protruding to the back surface side of the pedestal through the through hole.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] Conventional plasma blocks are manufactured by casting, which melts the material and pours the molten material into a mold filled with sand according to the mold. The mounting bolt hole portion (through hole 7) is formed by a mold or machining. Therefore, when dealing with the special mounting hole specifications of the plasma block, it is necessary to newly create, modify the mold, or change the machining, resulting in a long production and delivery time. In addition, special products for mounting holes are unique to each product, and it tends to be more difficult to handle in terms of cost.

[0008] Therefore, the present application provides a plasma block that can be easily changed to a specification that can be attached to various external structures.

Means for Solving the Problems

[0009] The plasma block of the present invention includes a bearing and a bearing housing for housing the bearing, and the bearing housing is a plasma block attached to an external structure via an attachment structure. The attachment structure includes a bolt member and an attachment that is detachably attached to a mounting hole formed in the bearing housing. The attachment has an insertion hole through which the bolt member is inserted, and a nut member is screwed onto the bolt member inserted through the insertion hole and a mounting hole provided in the external structure, or the bolt member inserted through the insertion hole is screwed into a threaded hole of the external structure.

[0010] In the plasma block of the present invention, since a nut member is screwed onto the bolt member inserted through the insertion hole and the mounting hole provided in the external structure, or the bolt member inserted through the insertion hole is screwed into the threaded hole of the external structure, an attachment corresponding to the mounting hole or threaded hole of the structure can be used.

[0011] The bearing housing may be formed as a separate upper housing and lower housing, or may be an integral body. Therefore, this plasma block is excellent in design.

[0012] The bearing housing and the attachment may be made of different materials. For example, an attachment having higher strength and higher rigidity than the material constituting the bearing housing can be used, the strength and rigidity of the insertion hole portion of the attachment can be improved, and the plasma block can be stably attached to the structure.

[0013] The attachment includes a plurality of types having different shapes, arrangement positions, and numbers of insertion holes, and the attachment suitable for the mounting hole or threaded hole of the external structure is selected and used. In this way, if a plurality of types of attachments are prepared, it is possible to attach to various structures with one type of bearing housing.

Effect of the Invention

[0014] In the present invention, by replacing the attachment, it can be made to correspond to the mounting holes and screw holes of the structure. Therefore, even if the external structure has a special mounting hole specification, by replacing it with an attachment having a special mounting hole specification, it is common to the bearing housing itself and can be corresponded to, without the need for new manufacturing, modification, or change in machining of the mold, and the production lead time will not be lengthened.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying Out the Invention

[0016] Embodiments of the present invention will be described below with reference to FIGS. 1 to 8. As shown in FIG. 3, the plasma block according to the present invention includes a rolling bearing 22 that rotatably supports a shaft 21, and a bearing box 23 that houses the rolling bearing 22.

[0017] 25a is illustrated. As shown in FIGS. 1 and 3, the bearing box 23 has an upper upper box 23A and a lower lower box 23B. The upper upper box 23A and the lower lower box 23B are combined to form the bearing box 23. The upper box 23A and the lower box 23B are connected and integrated via a connecting member 24. The connecting member 24, the bolt member 25, includes a head 25a and a shaft portion (not shown) having a male screw portion.

[0018] The upper box 23A includes an upper box main body portion 23A1 having a semi-cylindrical hole portion into which the upper half of the bearing 22 is fitted, and connecting convex portions 23A2, 23A2 provided at side end portions of the upper box main body portion 23A1 (provided at both left and right end portions of the upper box main body portion 23A1 in FIG. 1). Through holes 30 into which the shaft portions of the bolt members 24 are inserted are formed in the connecting convex portions 23A2, 23A2. Further, as shown in FIG. 3, semi-circular arc-shaped inner flange portions 23A1a, 23A1b are formed at the axial end portions of the upper box main body portion 23A1.

[0019] Further, the lower case 23B includes a lower case main body portion 23B1 having a semi-cylindrical hole portion into which the lower half of the bearing 22 is fitted, and a rectangular base member 23B2 (see FIG. 2) in a plan view that receives the lower case main body portion 23B1. The lower case 23B is provided with connecting convex portions 29, 29 having receiving surfaces 29a, 29a on which the lower surfaces 28a of the connecting convex portions 23A2, 23A2 of the upper case 23A abut when the upper case 23A and the lower case 23B are overlapped (provided on both left and right end portions of the lower case main body portion 23B1 in FIG. 1). In this case, each of the connecting convex portions 29, 29 stands upright from the base member 23B2 (provided on both left and right end portions of the lower part of the lower case main body portion 23B1 in FIG. 1). And, screw holes 31 corresponding to the through holes 30 of the connecting convex portions 23A2, 23A2 are provided in the connecting convex portions 29, 29 in a state where the lower surfaces 28a of the connecting convex portions 23A2, 23A2 abut against the receiving surfaces 29a, 29a of the connecting convex portions 29, 29 when the upper case 23A and the lower case 23B are overlapped. As shown in FIG. 3, semi-circular arc-shaped inner flange portions 23B1a, 23B1b are formed at the axial end portions of the lower case main body portion 23B1.

[0020] Therefore, as shown in FIG. 1, the shaft portion of the bolt member 4 is inserted into the through holes 30 of the connecting convex portions 23A2, 23A2 from above, and the male screw portion of the shaft portion of the bolt member 4 is screwed into the screw holes 31 of the connecting convex portions 29, 29, whereby the upper case 23A and the lower case 23B are connected.

[0021] In this way, in a state where the upper case 23A and the lower case 23B are connected to form the bearing box 23, inner flange portions 32, 32 are formed in a ring shape by the inner flange portions 23A1a, 23A1b of the upper case 23A and the inner flange portions 23B1a, 23B1b of the lower case 23B. And, concave circumferential grooves 32a, 32a are provided on the inner diameter surfaces of the inner flange portions 32, 32, and seal members 33, 33 are fitted into the respective concave circumferential grooves 32a, 32a.

[0022] Incidentally, in this case, the bearing housing 23 is attached to an external structure K (for example, a pedestal in the shape of a flat substrate) via an attachment structure M. In this case, fitting holes 50, 50 are provided at both ends on the base member 23B2 of the lower housing 23B of the bearing housing 23. The attachment structure M includes an attachment 51 that is detachably fitted into the fitting hole 50, and a bolt member 53 that is inserted through an insertion hole 52 provided in the attachment 51.

[0023] As shown in FIG. 2, the fitting hole 50 has a rectangular shape that is long in the front-rear direction (the short-side direction of the base member) of the bearing housing 23, and has a narrow-width main body portion 50a on the pedestal side and a wide-width portion 50b on the upper-opening side (opposite to the pedestal side). Therefore, as shown in FIGS. 4 to 8, the attachment 51 has a rectangular parallelepiped shape and includes a narrow-width main body portion 51a corresponding to the narrow-width main body portion 50a of the fitting hole 50 and a wide-width portion 51b corresponding to the wide-width engaging portion 50b of the fitting hole 50. An insertion hole 52 through which the bolt member 53 is inserted is provided in the attachment 51.

[0024] Incidentally, as shown in FIGS. 4 to 8, a plurality of types of attachments 51 are prepared. In those shown in FIGS. 4(a) and 4(b), two insertion holes 52 are formed and provided at both ends in the longitudinal direction of the attachment. In this case, the insertion holes 52 are oval holes 52A that are oval in plan view (a shape in which a straight line is inserted between two semi-circles). Further, the longitudinal direction of the insertion holes 52 (oval holes 52A) is perpendicular to the longitudinal direction of the attachment 51. In those shown in FIGS. 5(a) and 5(b), one insertion hole 52 is provided in the middle part in the longitudinal direction of the attachment, and the shape of the insertion hole 52 is also the oval hole 52A. In those shown in FIGS. 6(a) and 6(b), two insertion holes 52 are formed and provided at both ends in the longitudinal direction of the attachment. In this case, the insertion holes 52 are circular holes 52B that are circular in plan view. In those shown in FIGS. 7(a) and 7(b), one insertion hole 52 is provided in the middle part in the longitudinal direction of the attachment, and this insertion hole 52 is the circular hole 52B. In those shown in FIGS. 8(a) and 8(b), two insertion holes 52 are formed. In this case, one of the insertion holes 52 is an oval hole 52A, and the other insertion hole 52 is a circular hole 52B. Further, the circular hole 52B is provided between the middle part in the longitudinal direction of the attachment and the end on the side opposite to the oval hole.

[0025] Assuming that the pedestal as the external structure K in this case is provided with mounting holes 55 instead of screw holes, when the screw shaft portion 53b of the bolt member 53 is inserted into the mounting hole 55 from below the pedestal K and the male screw portion 53b1 of the screw shaft portion is exposed to the upper box side from the insertion hole 52 of the attachment 51 fitted in the fitting hole portion 50, and a nut member 56 is screwed onto the exposed portion, this plasma block can be attached to the pedestal K.

[0026] Also, assuming that the pedestal as the external structure K is provided with screw holes, the screw shaft portion of the bolt member 53 is inserted into the insertion hole 52 of the attachment 51 fitted in the fitting hole portion 50 from the upper box 23A side, and the male screw portion of the screw shaft portion of the bolt member 53 is screwed into the screw hole of the pedestal, so that this plasma block can be attached to the pedestal K.

[0027] Therefore, as the attachment 51 to be used, one having insertion holes 52 corresponding to the mounting holes 55 and the positions and numbers of the screw holes of the pedestal as the structure K can be used.

[0028] That is, the attachment 51 includes a plurality of types with different shapes, arrangement positions, and numbers of the insertion holes 52, and an attachment suitable for the mounting holes and screw holes of the external structure K is selected and used.

[0029] By the way, the bearing box 23 and the attachment 51 may be made of different materials, and an attachment 51 having higher strength and higher rigidity than the material constituting the bearing box 23 can be used. For example, even when the bearing box 23 (the upper box 23A and the lower box 23B) is made of FC200 (gray cast iron) or the like, the attachment 51 can be made of carbon steel such as S35C. Therefore, the strength and rigidity of the insertion hole portion of the attachment can be improved, and the plasma block can be stably attached to the structure K.

[0030] Further, in the above embodiment, the bearing box 23 has an upper box 23A and a lower box 23B separate from the upper box 23A, and the upper box 23A and the lower box 23B are integrated via a connecting tool 24, but the bearing box may be an integrally formed product.

[0031] In the present invention, since the nut member 56 is screwed onto the bolt member 53 inserted through the insertion hole 52 and the mounting hole 55 provided in the external structure K, or the bolt member 53 inserted through the insertion hole 52 is screwed into the screw hole of the external structure K, an attachment 51 corresponding to the mounting hole or the 55 screw hole of the structure K can be used.

[0032] Therefore, even if the external structure K has a special mounting hole specification, by replacing it with an attachment having a special mounting hole specification, it can be dealt with using a common bearing box itself, without the need for new mold making, modification, or change in machining, and the production delivery period will not be prolonged.

[0033] As the bearing housing 23, as described above, there may be a case where the upper housing 23A and the upper housing 23B are formed separately, or they may be integrally formed. For this reason, this plan block is excellent in design.

[0034] The attachment 51 can be made of a material with higher strength and higher rigidity than the material constituting the bearing housing 23, the strength and rigidity of the insertion hole 52 portion of the attachment 51 can be improved, and the plan block can be stably attached to the structure K.

[0035] The attachment 51 includes a plurality of types with different shapes, arrangement positions, and numbers of the insertion holes 52, and the attachment 51 suitable for the mounting holes or screw holes of the external structure K is selected and used. In this way, if a plurality of types of attachments 51 are prepared, it is possible to attach to various structures K with one type of bearing housing.

[0036] As described above, the embodiments of the present invention have been described. However, the present invention is not limited to the above embodiments and can be variously modified. As the rolling bearing 22, a bearing for an automatic aligning roller or an automatic aligning ball bearing can be used. Further, one opening of the bearing housing 23 may be closed with an end plate.

[0037] The types of the attachment 51 are not limited to those shown in FIGS. 4 to 8. For example, even if three or more insertion holes 52 are provided, or when the insertion hole 52 is an oval hole, the longitudinal direction thereof may be along the longitudinal direction of the attachment. In the attachments 51 shown in FIGS. 4 and 6, if one insertion hole 52 is provided at the central portion in the longitudinal direction of the attachment, three insertion holes 52 will be formed in this attachment. In this case, the central insertion hole 52 can be an oval hole 52A or a circular hole 52B. Also, in the attachments shown in FIGS. 5 and 7, if insertion holes 52, 52 are provided on both end portions sides in the longitudinal direction of the attachment, three insertion holes 52 will be formed in these attachments. In this case, both insertion holes 52, 52 at both end portions can be oval holes 52A, 52A, or both can be circular holes 52B, 52B, or further, one can be an oval hole 52A and the other can be a circular hole 52B. In the attachment 51 of FIG. 8, the insertion hole 52 on the end portion side in the longitudinal direction of the attachment is an oval hole 52A and the other insertion hole 52 is a circular hole 52B, but conversely, the insertion hole 52 on the end portion side in the longitudinal direction of the attachment can be a circular hole 52B and the other insertion hole 52 can be an oval hole 52A.

[0038] Also, since the attachments 51 shown in FIGS. 4 to 7 are symmetric with respect to the center line L, in the horizontal plane, even if reversed, the positions and shapes of the insertion holes 52 do not change, and it is easy to use. Also, since the attachment 51 in FIG. 8 is asymmetric with respect to the center line L, in the horizontal plane, if reversed, the positions and shapes of the insertion holes 52 change, and two types of usage methods are possible.

[0039] Also, in the embodiment, it was preferable that the attachment 51 and the bearing box 23 be made of different materials, but of course, they may be made of the same material.

[0040] Note that in the embodiment, mounting holes 50 into which the attachments 51 are respectively fitted are provided at both end portions of the base member 23B2 having a rectangular shape in plan view, but either one of them may be omitted.

Explanation of Signs

[0041] 22 bearings 23 bearing housing 23A upper housing 23B lower housing 25 connector 50 fitting hole part 51 attachment 52 insertion hole 53 bolt member K structure (pedestal) M mounting structure

Claims

1. A plummer block comprising a bearing and a bearing housing for housing the bearing, wherein the bearing housing is attached to an external structure via an attachment structure, the attachment structure includes a bolt member and an attachment that is detachably attached to a mounting hole formed in the bearing housing. The attachment has an insertion hole through which the bolt member is inserted, and a nut member is screwed onto the bolt member inserted through the insertion hole and a mounting hole provided in the external structure, or the bolt member inserted through the insertion hole is screwed into a threaded hole of the external structure. A plummer block characterized by this.

2. The bearing housing has an upper housing and a lower housing separate from the upper housing, and the upper housing and the lower housing are integrated via a connecting member, and the mounting hole is provided in the lower housing. The plummer block according to claim 1, characterized by this.

3. The plummer block according to claim 1, characterized in that the bearing housing is an integrally formed product.

4. The plummer block according to claim 1, characterized in that the bearing housing and the attachment are made of different materials.

5. The attachment includes a plurality of types having different shapes, arrangement positions, and numbers of insertion holes, and the attachment suitable for the mounting hole or threaded hole of the external structure is selected and used. The plummer block according to claim 1, characterized by this.

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