JP5758600B2 - Fan press hub - Google Patents

Description

  The present invention relates to a fan press hub for attaching a fan impeller to a drive shaft.

  For example, a sirocco fan that is widely used as a home or industrial ventilation fan is a type of centrifugal fan that performs a required air blowing action by rotationally driving a cylindrical impeller inside a casing. Therefore, it has a feature that it can be operated in a wide flow rate range. The impeller of such a sirocco fan is attached to a drive shaft such as an electric motor as a drive source via a hub fixed to the center portion of the support plate.

  By the way, as the hub, there are known an aluminum die-cast hub 110 as shown in FIG. 10 and a hub formed by forging. The hub 110 is formed by integrally forming a boss portion 110B at the center of the flange portion 110A, and a shaft hole 110a through which a drive shaft 105 such as a motor is inserted is formed through the boss portion 110B by machining. Yes. And the ditch | groove 110b is formed in the end surface of the boss | hub part 110B.

  The hub 110 is fastened by a nut 112 through a plate-shaped washer 111 to a screw portion 105a protruding from the boss portion 110B of the drive shaft 105 through a shaft hole 110a that is provided in the boss portion 110B. Is attached to the drive shaft 105. Here, a part of the outer periphery of the screw portion 105 a of the drive shaft 105 is cut flat to be formed into a D shape, and a D-shaped hole 111 a is formed in the center portion of the washer 111. Accordingly, the D-shaped screw portion 105a of the drive shaft 105 is fitted into the D-shaped hole 111a of the washer 111, and the washer 111 is fitted into the concave groove 110b formed in the boss portion 110B of the hub 110, whereby A rotation prevention with respect to the drive shaft 105 is made.

  However, in the die-cast hub 110, the washer 111 is required as a detent part, and the concave groove 110b must be formed in the boss part 110B of the hub 110 by machining. There was a problem that the processing man-hours increased and the cost increase was unavoidable. In addition, the die-cast hub 110 has a high ratio of material cost to the cost, and this also increases the cost of the hub 110.

  Further, Patent Document 1 proposes a hub 210 that is integrally formed by pressing an iron plate or the like as shown in FIG. 11. In this hub 210, mounting to a drive shaft is proposed. Since the weld nut 214 welded to the boss portion 210B of the hub 210 and the bolt 215 screwed to the weld nut 214 are formed, the thin boss portion 210B is deformed by welding heat when welding the weld nut 214, or the strength is insufficient. There are problems such as.

  Further, Patent Document 2 proposes a hub 310 formed integrally with the support plate 309 by pressing the support plate 309 as shown in FIG. In this hub 310, a set screw 315 is screwed into a female screw portion 310a formed into a cylindrical shape by burring processing, and a tip portion of the set screw 315 is pressed against the folded portion 310b of the hub 310 to thereby turn the folded portion 310b. Since the hub 310 is fixed to the drive shaft 305 by bringing the hub 310 into close contact with the drive shaft 305, there is a possibility that the hub 310 is deformed and insufficient strength or misalignment occurs in the hub 310.

  Therefore, the present applicant has previously proposed a press hub 410 as shown in FIG. 13 (see Patent Document 3). The press hub 410 is integrally formed by pressing a metal plate, and includes a disc-shaped flange portion 410A and a cylindrical boss portion 410B that integrally extends from the center of the flange portion 410A in a direction perpendicular to the flange surface. And a drive shaft 405 inserted through the boss portion 410B and a nut 412 screwed into the drive shaft 405, and is detachably attached to the drive shaft 405 together with a fan impeller (not shown). Although not shown, the press hub 410 is attached to a fan impeller.

  A D-shaped hole 410a for preventing rotation is integrally formed at the tip of the boss portion 410B of the press hub 410 by pressing, and a screw portion 405A is formed at the tip of the drive shaft 405. A flat D-shaped cut portion 405 a is formed on the outer periphery of the screw portion 405 A of the drive shaft 405, and a snap ring 411 as a stopper is fitted at a predetermined position of the drive shaft 405.

  Thus, to attach the impeller formed by fixing the press hub 410 to the drive shaft 405, the drive shaft 405 is passed through the boss portion 410 B of the press hub 410, and the D-shaped screw portion 405 A of the drive shaft 405 is inserted into the press hub 410. It passes through a D-shaped hole 410a for rotation prevention formed at the tip of the boss 410B. When the nut 412 is screwed into the screw portion 405A protruding from the boss portion 410B of the press hub 410 of the drive shaft 405 and tightened, the impeller is attached to the drive shaft 405 via the press hub 410, and the drive shaft 405 When the D-cut portion 405a formed on the screw portion 405A is engaged with the D-shaped hole portion 410a formed on the boss portion 410B of the press hub 410, the impeller is reliably prevented from rotating with respect to the drive shaft 405.

Japanese Utility Model Publication No. 57-107996 Japanese Utility Model Publication No. 57-164299 Japanese Patent Laid-Open No. 2002-039095

  However, in the press hub 410 shown in FIG. 13 proposed in Patent Document 3, when the drive shaft 405 is passed through the boss portion 410B, the D formed on the boss portion 410B is slightly displaced in the circumferential direction. There is a problem that the drive shaft 405 is not easily inserted because the mold hole portion 410a and the D-cut portion 405a formed on the screw portion 405A of the drive shaft 405 do not coincide with each other, and the assemblability is poor.

  The present invention has been made in view of the above problems, and an object thereof is to provide a fan press hub in which a drive shaft can be easily inserted.

In order to achieve the above object, an invention according to claim 1 is a component attached to a fan, which is integrally formed by pressing, and has a disk-like flange portion and a flange surface from the center of the flange portion. A fan press hub having a cylindrical boss portion integrally extending in a right angle direction and detachably attached to the drive shaft together with the fan by a drive shaft inserted through the boss portion and a fixing part attached thereto. A D-shaped hole is formed in a part of the boss, and a slope-shaped guide for guiding the insertion of the drive shaft is formed between the D-shaped hole and the cylindrical portion of the boss. The D-shaped hole portion and the guide portion are formed by deforming a part of the boss portion by press working.

  According to the first aspect of the present invention, since the inclined guide portion is formed between the D-shaped hole portion formed in a part of the boss portion of the fan press hub and the cylindrical portion of the boss portion, the boss portion is driven. Even when the D-shaped hole of the boss part and the D-cut part of the drive shaft do not coincide with each other because the two are displaced in the circumferential direction when the shaft is inserted, the tip of the drive shaft is in contact with the boss part of the press hub. By engaging the formed inclined guide portion, the circumferential position of the drive shaft is corrected, and the D-cut portion of the drive shaft is guided to the D-shaped hole portion of the press hub so that they coincide. For this reason, the drive shaft can be easily inserted into the press hub, the fan can be easily assembled, and the D-cut portion of the drive shaft is engaged with the D-shaped hole formed in the boss portion of the press hub. And the fan impeller is reliably prevented from rotating with respect to the drive shaft.

According to the invention of claim 1 wherein, due to so as to form a D-type hole and the guide portion by deforming by pressing a portion of the boss portion of Puresuhabu, detent parts and machining as a separate component This eliminates the need to reduce the number of parts and the number of processing steps, thereby reducing costs. Also, if the press hub and the drive shaft are made of metal, the difference in strength between them can be kept small, and the material cost and processing cost can be reduced, thereby reducing the cost of the press hub.

It is a front view of a sirocco fan. It is a fracture | rupture side view (fracture sectional view of the arrow A direction of FIG. 1) of a sirocco fan. It is the B section expanded sectional view of FIG. FIG. 4 is an enlarged sectional view taken along the line CC in FIG. 3. It is a disassembled perspective view which shows the assembly structure of the press hub which concerns on this invention. It is a front view of the press hub which concerns on this invention. It is a side view of the press hub which concerns on this invention. It is the DD sectional view taken on the line of FIG. It is the EE sectional view taken on the line of FIG. It is a disassembled perspective view which shows the assembly | attachment structure of the hub for conventional sirocco fans made from aluminum die-casting. It is a perspective view of the conventional press hub. It is sectional drawing of the conventional press hub. It is a disassembled perspective view which shows the assembly structure of the conventional press hub.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 is a front view of the sirocco fan, FIG. 2 is a cutaway side view of the sirocco fan (fracture cross-sectional view in the direction of arrow A in FIG. 1), FIG. 3 is an enlarged cross-sectional view of portion B in FIG. FIG. 5 is an exploded perspective view showing the assembly structure of the press hub according to the present invention, FIG. 6 is a front view of the press hub, FIG. 7 is a side view of the press hub, and FIG. FIG. 9 is a sectional view taken along line E-E in FIG.

  A sirocco fan 1 shown in FIGS. 1 and 2 is configured by rotatably accommodating a cylindrical impeller 3 in a sheet metal casing 2, and the impeller 3 is attached to one end surface of the casing 2. It is attached to the end of the drive shaft 5 of the electric motor 4 as a drive source in a cantilever state.

  A circular suction port 2a is opened on the other end surface of the casing 2 (the surface opposite to the surface on which the electric motor 4 is attached) (see FIG. 1), and air is introduced into the periphery of the suction port 2a. A bell mouth-shaped inlet ring 6 for guiding to the impeller 3 is attached. A scroll-like flow path is formed in the casing 2, and a rectangular discharge port 2b is opened in the upper portion of the casing 2 (see FIG. 2).

  By the way, the impeller 3 is formed in a cylindrical shape by arranging a plurality of blades (blades) 7 at equal angular pitches in the circumferential direction, and a reinforcing ring 8 is attached to one end thereof and the other end is attached to the other end. A disc-shaped support plate (back plate) 9 is attached. A press hub 10 according to the present invention is fixed to the center portion of the support plate 9, and the impeller 3 is attached to the drive shaft 5 of the electric motor 4 via the press hub 10.

  Here, the detail of the structure of the said press hub 10 which concerns on this invention is demonstrated based on FIGS.

  The press hub 10 according to the present invention is integrally formed by pressing a metal plate such as an iron plate. The press hub 10 includes a disc-shaped flange portion 10A and a right angle from the center of the flange portion 10A to the flange surface. It has a cylindrical boss portion 10B extending integrally in the direction.

  Thus, a flange-shaped receiving seat 10C is integrally formed at the tip of the boss portion 10B of the press hub 10 according to the present embodiment, and a recess 10D is formed at the axially intermediate portion of the boss portion 10B. ing. The concave portion 10D is formed by deforming the outer periphery of the intermediate portion in the axial direction of the boss portion 10B into a concave shape by pressing.

  By forming the recess 10D in the boss 10B of the press hub 10, a D-shaped hole 10a having a D-shaped cross section is formed inside the boss 10B as shown in FIGS. An inclined guide portion 10c for guiding the insertion of the drive shaft 5 is formed between the D-shaped hole 10a and the cylindrical portion 10b. The inner diameter of the cylindrical portion 10b of the boss portion 10B is set to be slightly larger than the outer diameter of the drive shaft 5 of the electric motor 4.

  On the same circumference of one end surface of the flange portion 10A of the press hub 10 (the surface on which the boss portion 10B extends), six cylindrical projections 10d are formed at an equiangular pitch (60 ° pitch) by burring. Projected as a single unit. In addition, the deep drawing of the boss part 10B is performed in multiple steps for the cylindrical deep drawing with large flanges by press working (the flange diameter is more than twice the shaft diameter and the drawing depth is more than twice the shaft diameter). Can be done in pieces.

  Next, a structure for attaching the press hub 10 having the above-described configuration to the support plate 9 and the drive shaft 5 will be described.

  As shown in FIG. 3, a circular hole 9a through which the boss 10B of the press hub 10 passes is formed at the center of the support plate 9, and is formed around the flange 10A of the press hub 10 at the periphery thereof. In addition, six small-diameter circular holes 9b through which the cylindrical protrusion 10d passes are formed on the same circumference at an equiangular pitch (60 ° pitch).

  Thus, the boss portion 10B of the press hub 10 is passed through the circular hole 9a formed in the central portion of the support plate 9 as shown in FIG. 3, and the cylindrical protrusion 10d protruding from the flange portion 10A of the press hub 10 is provided. A portion protruding from the support plate 9 of each cylindrical projection 10d of the press hub 10 in a state where the flange portion 10A of the press hub 10 is brought into close contact with the support plate 9 through the circular hole 9b formed in the support plate 9. By pressing outward and crimping, the press hub 10 is securely fixed to the center portion of the support plate 9, and the boss portion 10 B of the press hub 10 passes through the center portion of the support plate 9 toward the inside of the impeller 3. Protruding.

  In order to attach the impeller 3 formed by fixing the press hub 10 to the support plate 9 by caulking (eyelet caulking) as described above to the drive shaft 5 of the electric motor 4, the inlet ring 6 shown in FIGS. 2, the impeller 3 is pushed into the casing 2 from the suction port 2 a of the casing 2 with the press hub 10 at the tip side, and the drive shaft 5 of the electric motor 4 is passed through the boss portion 10 </ b> B of the press hub 10.

  Here, as shown in FIG. 5, a screw portion 5A and a flat D-cut portion 5a are formed at the tip of the drive shaft 5 of the electric motor 4, and a snap as a stopper is provided at a predetermined position of the drive shaft 5. A ring 11 is fitted.

  Thus, when the impeller 3 is pushed together with the press hub 10 while the drive shaft 5 of the electric motor 4 is passed through the boss portion 10B of the press hub 10 as described above, the press hub 10 and the drive shaft 5 are displaced in the circumferential direction. 9, the D-shaped hole 10 a formed in the boss portion 10 </ b> B of the press hub 10 and the D-cut portion 5 a of the drive shaft 5 do not coincide with each other as shown by a chain line in FIG. The portion engages with an inclined guide portion 10 c formed on the boss portion 10 </ b> B of the press hub 10. When the impeller 3 is pushed together with the press hub 10 in a state where the tip end portion of the drive shaft 5 is engaged with the guide portion 10c formed on the boss portion 10B of the press hub 10, the circumferential position of the drive shaft 5 is corrected. The D-cut portion 5a of the drive shaft 5 is guided to the D-shaped hole portion 10a of the press hub 10 so that they coincide with each other. Therefore, the drive shaft 5 can be easily inserted into the boss portion 10B of the press hub 10, the assemblability of the impeller 3 is improved, and the drive shaft is inserted into the D-shaped hole 10a formed in the boss portion 10B of the press hub 10. As a result, the press hub 10 and the impeller 3 are reliably prevented from rotating with respect to the drive shaft 5.

  When the drive shaft 5 is passed through the boss portion 10B of the press hub 10 as described above, the fixed component 12 is screwed into the screw portion 5a protruding from the boss portion 10B of the press hub 10 of the drive shaft 5 and tightened. The entire impeller 3 is attached to the drive shaft 5 via the press hub 10, and the D-cut portion 5a of the drive shaft 5 is engaged with the D-shaped hole 10a formed in the boss portion 10B of the press hub 10 as described above. By doing so, the impeller 3 is reliably prevented from rotating with respect to the drive shaft 5. Note that a reverse screw is engraved on the fixed component 12, and its tightening direction coincides with the rotational direction of the drive shaft 5.

  When the impeller 3 is attached to the drive shaft 5 of the electric motor 4 in the casing 2 as described above, the inlet ring 6 is attached to the peripheral edge of the intake port 2a of the casing 2, and all assembling operations are completed.

  Thus, when the drive shaft 5 is driven to rotate at a predetermined speed by driving the electric motor 4, the impeller 3 attached to the drive shaft 5 via the press hub 10 rotates at the same speed in the casing 2. The rotation of the impeller 3 introduces air into the impeller 3 while being guided by the inlet ring 6 from the inlet 2a of the casing 2, and the air is given kinetic energy by the impeller 3 to be pressurized and then centrifuged. It is discharged radially outward from the periphery of the impeller 3 by force, and is discharged from a discharge port 2b of the casing 2 to a duct or the like (not shown) through a scroll-like flow path in the casing 2, thereby Ventilation is performed.

  As described above, in the present embodiment, the inclined guide portion 10c is formed between the D-shaped hole portion 10a formed inside the boss portion 10B of the press hub 10 and the cylindrical portion 10b of the boss portion 10B. Even when the D-shaped hole 10a of the boss 10B and the D-cut 5a of the drive shaft 5 do not coincide with each other because the both are displaced in the circumferential direction when the drive shaft 5 is inserted into the boss 10B. The circumferential position of the drive shaft 5 is corrected by engaging the tip portion of the shaft 5 with the inclined guide portion 10c formed on the boss portion 10B of the press hub 10, and the D-cut portion 5a of the drive shaft 5 is fixed to the press hub. They are guided to 10 D-shaped holes 10a so that they coincide with each other. For this reason, the drive shaft 5 can be easily inserted into the press hub 10, the assemblability of the impeller 3 is improved, and the D-shaped hole 10a formed in the boss portion 10B of the press hub 10 has a D-cut. The press hub 10 and the impeller 3 are reliably prevented from rotating with respect to the drive shaft 5 by the engagement of the portion 5a.

  In the present embodiment, a concave portion 10D is formed by deforming a part of the boss portion 10B of the press hub 10 by press working, and the D-shaped hole portion 10a and the guide portion 10c are formed inside the boss portion 10B. Therefore, non-rotating parts and machining as separate parts are not required, and the number of parts and the number of processing steps are reduced, thereby reducing costs. If the press hub 10 and the drive shaft 5 are made of metal as in the present embodiment, the difference in strength between them can be kept small, and the material cost and the processing cost can be reduced. This also reduces the cost of the press hub 10. Down is planned.

  Although the present invention has been described with respect to the embodiment in which the present invention is applied particularly to the press hub of a single-suction sirocco fan, the present invention applies to a press hub of a fan other than a sirocco fan in addition to a press hub of a double-suction sirocco fan. Of course, the same applies.

DESCRIPTION OF SYMBOLS 1 Sirocco fan 2 Casing 2a Casing suction port 2b Casing discharge port 3 Impeller 4 Electric motor 5 Drive shaft 5A Drive shaft screw part 5a Drive shaft D cut part 6 Inlet ring 7 Blade 8 Reinforcement ring 9 Support plate 9a, 9b Circular hole of support plate 10 Press hub 10A Press hub flange 10B Press hub boss 10C Press hub receiving seat 10D Press hub recess 10a B hub D-shaped hole 10b Boss cylinder 10c Boss guide 10d Press hub Cylindrical projection 11 Snap ring 12 Fixed part

Claims (1)

A component that is attached to a fan, and is integrally formed by pressing, and has a disc-shaped flange portion and a cylindrical boss portion that integrally extends from the center of the flange portion in a direction perpendicular to the flange surface. In a fan press hub that is detachably attached to the drive shaft together with the fan by a drive shaft that is inserted into the boss portion and a fixing part that is attached to the drive shaft.
A D-shaped hole is formed in a part of the boss, and an inclined guide for guiding the insertion of the drive shaft is formed between the D-shaped hole and the cylindrical portion of the boss. ,
A fan press hub, wherein the D-shaped hole portion and the guide portion are formed by deforming a part of the boss portion by press working.

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