TWI565879B - Friction hub with fan - Google Patents

Description

Fan with stamping hub

The present invention relates to a stamping hub for a fan for mounting an impeller of a fan to a drive shaft.

For example, a sirocco fan widely used as a household or industrial ventilating fan is a type of centrifugal fan, and is required to perform a slewing drive of a cylindrical impeller in a casing. The air supply function has the advantage of being able to operate in a wide flow range. The impeller of the multi-blade fan is attached to a drive shaft of an electric motor or the like as a drive source via a hub that is fixed to a center portion of the support plate.

Further, as the above-described hub, a hub 110 made of aluminum die-casting as shown in Fig. 10 or a hub formed by forging is known. The hub 110 is integrally formed with the boss portion 110B at the center of the flange portion 110A, and in the boss portion 110B, there is a shaft hole 110a which is bored according to machining, and the shaft hole 110a is for A drive shaft 105 of a motor or the like is inserted and penetrated. Further, a groove 110b is formed on the end surface of the boss portion 110B.

The hub 110 has a drive shaft 105 passing through a shaft hole 110a formed in the boss portion 110B of the hub 110, and is screwed by the nut 112 to protrude from the sleeve portion 110B of the drive shaft 105. The threaded portion 105a (via a flat washer 111) is used to mount the hub 110 to the drive shaft 105. Here, the threaded portion 105a of the drive shaft 105 is partially cut into a flat shape, and the screw portion 105a is formed in a D shape, and a D-shaped hole 111a is formed in the center portion of the washer 111. Then, the D-shaped thread 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 groove 110b which has been formed on the boss portion 110B of the hub 110, thereby achieving the prevention of the hub. The mechanism by which 110 is rotated relative to the drive shaft 105.

However, in the above-described die-cast manufacturing of the hub 110, there is a problem that the hub 110 requires the washer 111 as an anti-rotation component, and it is necessary to form the groove 110b on the boss portion 110B of the hub 110 according to machining, so the number of parts is The number of processing increases, and the cost increase cannot be avoided. Moreover, the material cost of the hub 110 manufactured by die casting is relatively high in cost, which is also an element of the cost of pulling up the hub 110.

Further, in Patent Document 1, a hub 210 as shown in Fig. 11 is proposed, which is integrally formed by press working on an iron plate or the like, but in the hub 210, it is based on a welded nut 214. The bolt 215 screwed onto the welded nut 214 is used to achieve the function of mounting the hub 210 to the drive shaft, and the welded nut 214 is welded to the sleeve portion 210B of the hub 210, so that there will be When the welding nut 214 is welded, the bush portion 210B having a small thickness is deformed by welding heat, and the strength is insufficient.

Further, Patent Document 2 proposes a hub 310 as shown in Fig. 12, which is integrally formed with the support plate 309 in accordance with press working of the support plate 309. In the hub 310, the fixing screw 315 is screwed to the female thread portion 310a formed into a cylindrical shape by burring, and the front end of the fixing screw 315 is pushed to the hub 310. The folded portion 310b is adhered to the drive shaft 305 so that the hub 310 is fixed to the drive shaft 305. Therefore, the hub 310 may be deformed, resulting in a situation of insufficient toughness or shaft misalignment on the hub 310.

Therefore, the applicant has previously proposed a press hub 410 as shown in Fig. 13 (refer to Patent Document 3). The press hub 410 has a disk-shaped flange portion 410A and a cylindrical boss portion 410B. The flange portion 410A is integrally formed by press working of a metal plate, and the boss portion 410B is from the flange portion. The center of the 410A extends out in a direction perpendicular to the flange face and is integrated with the flange portion 410A, and presses the stamping hub 410 with the drive shaft 405 and the nut 412 screwed to the drive shaft 405. The impeller of a fan (not shown) is detachably attached to the drive shaft 405, and the drive shaft 405 is inserted into and penetrates the boss portion 410B. Further, although not shown, the press hub 410 is mounted on the impeller of the fan.

The front end portion of the boss portion 410B of the press hub 410 has a D-shaped hole portion 410a integrally formed by press working, and the D-shaped hole portion 410a is for preventing rotation, and is at the front end portion of the drive shaft 405. A threaded portion 405A is formed. Further, a flat D-shaped cutout portion 405a is formed on the outer circumference of the screw portion 405A of the drive shaft 405, and a buckle 411 as a brake is fitted to a predetermined position of the drive shaft 405.

Then, in order to fix the impeller hub 410, the impeller is mounted on the drive shaft 405 such that the drive shaft 405 passes through the boss portion 410B of the press hub 410, and the D-shaped threaded portion 405A of the drive shaft 405 is The D-shaped hole portion 410a is formed on the front end portion of the boss portion 410B of the press hub 410, and is used for preventing rotation. Then, if the nut 412 is screwed onto the threaded portion 405A of the drive shaft 405 protruding from the sleeve portion 410B of the punching hub 410 and the nut 412 is tightened, the impeller is mounted via the stamping hub 410. The drive shaft 405 is engaged (engaged) with the D-shaped hole portion 410a formed on the boss portion 410B of the press hub 410 in accordance with the D-shaped cut portion 405a formed on the thread portion 405A of the drive shaft 405. In the middle, a mechanism for preventing the impeller from rotating relative to the drive shaft 405 is surely achieved.

[Advanced technical literature]

(Patent Literature)

Patent Document 1: Japanese Patent Publication No. Sho 57-107996.

Patent Document 2: Japanese Patent Publication No. Sho 57-164299.

Patent Document 3: Japanese Laid-Open Patent Publication No. 2002-039095.

However, in the press hub 410 proposed by Patent Document 3 shown in Fig. 13, there is a problem that when the drive shaft 405 is inserted into the boss portion 410B, if the two are slightly staggered in the circumferential direction, The D-shaped hole portion 410a formed on the boss portion 410B does not coincide with the D-shaped cutout portion 405a formed on the screw portion 405A of the drive shaft 405 (not aligned), so the drive shaft 405 will be difficult to insert. This makes assembly inferior.

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

In order to achieve the above object, the invention of claim 1 is a stamping hub for a fan, which is a component to be mounted to a fan, integrally formed according to a press working, and the stamping hub for the fan has a circular plate a flange portion and a cylindrical sleeve portion integrally extending from a center of the flange portion toward a direction perpendicular to the flange surface, and inserted and penetrated through the sleeve portion The drive shaft and the fixed part mounted on the drive shaft, the fan press hub is detachably mounted on the drive shaft together with the fan, and the fan press hub is characterized in that A part of the boss portion forms a D-shaped hole portion, and a sloped guide portion is formed between the D-shaped hole portion and the cylindrical portion of the boss portion, and the guide portion is used for guiding Insertion of the above drive shaft.

The invention of claim 2 is the invention according to claim 1, wherein the D-shaped hole portion and the guide are formed by deforming a part of the boss portion by press working. Leading section.

According to the invention of claim 1, the slanted surface is formed between the D-shaped hole portion formed in a part of the boss portion of the fan pressing hub and the cylindrical portion of the boss portion. The guide portion, so that even when the drive shaft is inserted into the boss portion, the two are staggered in the circumferential direction, so that the D-shaped hole portion of the sleeve portion is inconsistent (not aligned) with the D-shaped cut portion of the drive shaft In this case, the position of the drive shaft in the circumferential direction can be corrected based on the engagement of the front end portion of the drive shaft with the inclined guide portion formed on the boss portion of the press hub, and the D-shaped drive shaft can be removed. The part is guided to the D-shaped hole of the stamping hub to make the two match. Therefore, the drive shaft can be easily inserted into the press hub, the assemblability of the fan can be improved, and the D-shaped hole portion formed on the boss portion of the press hub can be surely engaged with the D-shaped cut portion of the drive shaft. The impeller and the impeller of the fan are prevented from rotating relative to the drive shaft.

According to the invention of claim 2, since a part of the boss portion of the press hub is deformed by press working, the D-shaped hole portion and the guide portion are formed, so that it is not required as another component. Anti-rotation parts and machining, reducing the number of parts and the number of processing, in order to reduce costs. Further, when the press hub and the drive shaft are formed of metal, the difference in strength between the two can be suppressed to be small, and the material cost and the processing cost can be reduced, whereby the cost of the press hub can be reduced.

Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.

Fig. 1 is a front view of a multi-blade fan, and Fig. 2 is a broken side sectional view of the multi-blade fan (a broken sectional view seen in the direction of arrow A of Fig. 1), and Fig. 3 is FIG. 4 is an enlarged cross-sectional view taken along line CC of FIG. 3, FIG. 5 is an exploded perspective view showing a mounting structure of the press hub of the present invention, and FIG. 6 is an exploded perspective view of the present invention. Front view of the stamping hub, Fig. 7 is a side view of the stamping hub of the present invention, Fig. 8 is a sectional view taken along line DD of Fig. 6, and Fig. 9 is a sectional view taken along line EE of Fig. 8. .

The multi-blade fan 1 shown in FIGS. 1 and 2 is configured such that a cylindrical impeller 3 that is rotatable is housed in the sheet metal casing 2 of the multi-blade fan 1, and the impeller 3 is supported by one side. The state is mounted on the end of the drive shaft 5 of the electric motor 4, which is a drive source mounted on one end face of the outer casing 2.

A circular suction port 2a is opened to the other end surface of the outer casing 2 (opposite side surface to which the surface of the electric motor 4 is mounted) (refer to Fig. 1), and the periphery of the suction port 2a is provided for air The bellows-shaped intake ring 6 in the impeller 3 is introduced. Further, a spiral flow path is formed in the outer casing 2, and a rectangular discharge port 2b is provided in the upper portion of the outer casing 2 (see FIG. 2).

Further, the impeller 3 is formed in a cylindrical shape by arranging a plurality of blades (blades) 7 at equal angular intervals in the circumferential direction, and a reinforcing ring 8 is attached to one end of the impeller 3, and at the other end of the impeller 3 A disc-shaped support plate (back plate) 9 is mounted thereon. Then, the press hub 10 of 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 detailed configuration of the above-described press hub 10 of the present invention will be described based on Figs. 3 to 9 .

The press hub 10 of the present invention is integrally formed by press working a metal plate such as an iron plate, and the press hub 10 has a disk-shaped flange portion 10A and a cylindrical boss portion 10B, the shaft The sleeve portion 10B extends integrally from the center of the flange portion 10A toward the direction perpendicular to the flange surface.

Further, the flange-shaped socket 10C is integrally formed on the front end portion of the boss portion 10B of the press hub 10 of the present embodiment, and the recess portion 10D is formed in the axially intermediate portion of the boss portion 10B. In the recessed portion 10D, the outer periphery of the intermediate portion in the axial direction of the boss portion 10B is formed into a concave shape by press working, whereby the recessed portion 10D is formed.

The concave portion 10D is formed on the boss portion 10B of the press hub 10, and as shown in Figs. 8 and 9, a D-shaped hole portion having a D-shaped cross section is formed inside the boss portion 10B. 10a, and a slope-shaped guide portion 10c for guiding the insertion of the drive shaft 5 is formed between the D-shaped hole portion 10a and the cylindrical portion 10b. Further, the inner diameter of the cylindrical portion 10b of the boss portion 10B is set to be larger than the outer diameter of the drive shaft 5 of the electric motor 4.

Further, 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), according to the burring, the equiangular pitch (60° section) Six cylindrical protrusions 10d are integrally formed to be integrally formed. In addition, regarding the cylindrical deep drawing of the large flange which is performed by press working (the flange diameter is twice or more the diameter of the shaft, and the depth of the drawing is twice or more the diameter of the shaft), the sleeve can be set. The deep drawing processing of the portion 10B is divided into a plurality of steps.

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

As shown in Fig. 3, on the central portion of the above-mentioned support plate 9, a circular hole 9a for penetrating the boss portion 10B of the press hub 10 and penetrating the hole 9a is provided. Around the circumference, six small-diameter circular holes 9b are formed penetrating at equal angular pitches (60° pitch) on the same circumference, and the circular holes 9b are formed on the flange portion 10A of the press hub 10. The cylindrical projection 10d is penetrated.

Further, as shown in Fig. 3, the boss portion 10B of the press hub 10 is inserted through the circular hole 9a which has been penetrated at the center portion of the support plate 9, and is protruded from the flange portion of the press hub 10. The cylindrical projection 10d on the 10A is inserted through the circular hole 9b which has been penetrated and provided on the support plate 9 so that the flange portion 10A of the press hub 10 is adhered to the support plate 9, and then in the closed state, The portion of each of the cylindrical projections 10d of the press hub 10 that protrudes from the support plate 9 is outwardly expanded and crimped, whereby the press hub 10 is securely fixed to the center portion of the support plate 9, and the The boss portion 10B of the press hub 10 penetrates the center portion of the support plate 9 and protrudes toward the inner side of the impeller 3 .

When the impeller 3 is to be mounted on the drive shaft 5 of the electric motor 4 as described above, the impeller 3 is formed by fixing the press hub 10 and the support plate 9 by crimping (aperture crimping). As shown in FIGS. 1 and 2, the intake ring 6 is first detached from the outer casing 2, and then the press hub 10 is used as the front end side, and the impeller 3 is pushed into the outer casing 2 through the suction port 2a of the outer casing 2, so that the impeller 3 is pushed into the outer casing 2 through the suction port 2a of the outer casing 2, The drive shaft 5 of the electric motor 4 passes through the boss portion 10B of the press hub 10.

Here, as shown in Fig. 5, a screw portion 5A and a flat D-shaped cutout portion 5a are formed at the distal end portion of the drive shaft 5 of the electric motor 4, and are embedded at a predetermined position of the drive shaft 5. There is a buckle 11 as a brake.

Then, as described above, in a state where the drive shaft 5 of the electric motor 4 is passed through the boss portion 10B of the press hub 10, if the impeller 3 is pushed together with the press hub 10, the hub 10 and the drive shaft 5 are punched. When the circumferential direction is shifted, as shown by the chain line in Fig. 9, the D-shaped hole 10a formed in the boss portion 10B of the press hub 10 does not coincide with the D-shaped cut portion 5a of the drive shaft 5. (Not aligned), the front end portion of the drive shaft 5 is fitted to the inclined guide portion 10c formed on the boss portion 10B of the press hub 10. As described above, when the front end portion of the drive shaft 5 is engaged with the inclined guide portion 10c formed on the boss portion 10B of the press hub 10, when the impeller 3 is pushed together with the press hub 10, the drive shaft 5 is driven. The position in the circumferential direction is corrected, and the D-shaped cut-out portion 5a of the drive shaft 5 is guided to the D-shaped hole portion 10a of the press hub 10 to match the two. 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 can be improved, and the D-shaped cut-out portion 5a of the drive shaft 5 and the boss portion 10B formed in the press hub 10 can be improved. The engagement of the upper D-shaped hole portion 10a surely prevents the press hub 10 and the impeller 3 from rotating relative to the drive shaft 5.

As described above, after the drive shaft 5 passes through the boss portion 10B of the press hub 10, the fixing member 12 is screwed into the screw portion 5a of the drive shaft 5 that protrudes from the boss portion 10B of the press hub 10, and is tightened. When the component 12 is fixed, the entire impeller 3 is attached to the drive shaft 5 via the press hub 10, and as described above, according to the D-shaped cut-out portion 5a of the drive shaft 5 and the boss portion 10B which has been formed on the press hub 10. The engagement of the D-shaped hole portion 10a surely prevents the impeller 3 from rotating relative to the drive shaft 5. Further, a reverse thread is engraved on the fixed part 12, and the screwing direction of the thread coincides with the direction of rotation of the drive shaft 5.

After the impeller 3 is mounted on the drive shaft 5 of the electric motor 4 in the outer casing 2 as described above, the intake ring 6 is mounted on the periphery of the suction port 2a of the outer casing 2 to complete all assembly work.

Then, when the drive shaft 5 is rotationally driven at a predetermined speed by the driving of the electric motor 4, the impeller 3 attached to the drive shaft 5 via the press hub 10 is also rotated at the same speed in the casing 2, and According to the rotation of the impeller 3, the air is introduced into the impeller 3 from the intake port 2a of the outer casing 2 while being guided by the intake ring 6, and the air is supplied from the impeller 3 to the air to boost the air. The centrifugal force releases the air from the periphery of the impeller 3 toward the outside in the radial direction, and the air is discharged from the discharge port 2b of the casing 2 to the air duct (not shown) through the spiral flow path in the casing 2, thereby performing the air flow. Ventilation in the room, etc.

As described above, in the present embodiment, a bevel-shaped guide portion 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. 10c, therefore, even when the drive shaft 5 is inserted into the boss portion 10B, the two are displaced in the circumferential direction, so that the D-shaped hole portion 10a of the boss portion 10B does not coincide with the D-shaped cut portion 5a of the drive shaft 5 (no In the case of the quasi-), the circumferential position of the drive shaft 5 can be corrected based on the engagement of the front end portion of the drive shaft 5 with the inclined guide portion 10c formed on the boss portion 10B of the press hub 10, and The D-shaped cut-out portion 5a of the drive shaft 5 is guided to the D-shaped hole portion 10a of the press hub 10 so as to match the two. Therefore, the drive shaft 5 can be easily inserted into the press hub 10, the assembly of the impeller 3 can be improved, and the D-shaped hole portion 10a and the drive shaft 5 which are formed on the boss portion 10B of the press hub 10 can be D-shaped. The engagement of the type cutting portion 5a reliably prevents the press hub 10 and the impeller 3 from rotating relative to the drive shaft 5.

Further, in the present embodiment, a part of the boss portion 10B of the press hub 10 is deformed by press working to form the recess 10D, and the D-shaped hole portion 10a and the guide are formed inside the boss portion 10B. Since the portion 10c does not require anti-rotation parts and machining as other parts, the number of parts and the number of processing are reduced, and the cost is reduced. Further, according to the present embodiment, when the press hub 10 and the drive shaft 5 are configured by metal, the difference in strength between the two can be suppressed to be small, and the material cost and the processing cost can be reduced. The cost of the stamping hub 10 can be reduced.

Further, although the above description has been specifically applied to the form of the press hub to which the present invention is applied to the one-side suction type multi-blade fan, the present invention is of course equally applicable to the press hub of the double-side suction type multi-blade fan, and A stamping hub for a fan other than a multi-blade fan.

1. . . Multi-blade fan

2. . . shell

2a. . . Housing inlet

2b. . . Outlet of the outer casing

3. . . impeller

4. . . electric motor

5. . . Drive shaft

5A. . . Thread portion of the drive shaft

5a. . . D-shaped cutting part of the drive shaft

6. . . Intake ring

7. . . blade

8. . . Reinforcement ring

9. . . Support plate

9a, 9b. . . Circular hole of the support plate

10. . . Stamping wheel

10A. . . Stamping the flange of the hub

10B. . . Bushing part of the stamping hub

10C. . . Stamping hub bearing

10D. . . Stamping the recess of the hub

10a. . . D-shaped hole part of the sleeve part

10b. . . Cylinder part of the sleeve part

10c. . . Guide portion of the sleeve portion

10d. . . Cylindrical protrusion of the stamping hub

11. . . Buckle

12. . . Fixed part

Figure 1 is a front elevational view of a multi-blade fan.

Fig. 2 is a broken side view of the multi-blade fan (a broken sectional view seen in the direction of arrow A in Fig. 1).

Fig. 3 is an enlarged cross-sectional view showing a portion B of Fig. 2;

Fig. 4 is an enlarged cross-sectional view taken along line C-C of Fig. 3.

Fig. 5 is an exploded perspective view showing the assembled structure of the press hub of the present invention.

Figure 6 is a front elevational view of the stamping hub of the present invention.

Figure 7 is a side view of the stamping hub of the present invention.

Fig. 8 is a cross-sectional view taken along line D-D of Fig. 6.

Fig. 9 is a cross-sectional view taken along line E-E of Fig. 8.

Fig. 10 is an exploded perspective view showing the assembled structure of the conventional multi-blade fan hub manufactured by aluminum die-casting.

Figure 11 is a perspective view of a prior stamping hub.

Figure 12 is a cross-sectional view of a prior stamping hub.

Fig. 13 is an exploded perspective view showing the assembled structure of the conventional press hub.

4. . . electric motor

5. . . Drive shaft

5A. . . Thread portion of the drive shaft

5a. . . D-shaped cutting part of the drive shaft

9a. . . Circular hole of the support plate

9b. . . Circular hole of the support plate

10. . . Stamping wheel

10A. . . Stamping the flange of the hub

10B. . . Bushing part of the stamping hub

10C. . . Stamping hub bearing

10D. . . D-shaped hole part of the stamping hub

10a. . . D-shaped hole part of the sleeve part

10b. . . Cylinder part of the sleeve part

10c. . . Guide portion of the sleeve portion

10d. . . Cylindrical protrusion of the stamping hub

11. . . Buckle

12. . . Fixed part

Claims (2)

A stamping hub for a fan, which is a part to be attached to a fan, is integrally formed according to a press working, and the press hub for a fan has a disk-shaped flange portion and a cylindrical bush portion, the shaft The sleeve portion integrally extends from a center of the flange portion toward a direction perpendicular to the flange surface, and the fan is used according to a driving shaft inserted into the bushing portion and a fixing member mounted on the driving shaft The ram hub is detachably attached to the drive shaft together with the fan, and the fan ram of the fan is characterized in that a D-shaped hole portion is formed in a part of the boss portion, and A slanted guide portion is formed between the D-shaped hole portion and the cylindrical portion of the boss portion so as to be inclined toward a radial direction of the cylindrical portion, and the guide portion is for guiding the drive shaft The inclined surface guide portion is a planar surface parallel to the axial direction of the cylindrical portion, and is pivoted toward the radial direction of the cylindrical portion by an axis perpendicular to the axial direction. tilt, Inclined from the center to reduce the size of the cylindrical portion of the inclined surface until the guide portion shaped manner. The brushing hub for a fan according to claim 1, wherein the D-shaped hole portion and the guiding portion are formed by deforming a part of the boss portion by press working.