JP4732841B2 - Fan boss - Google Patents

Description

  The present invention relates to a fan boss in a fan such as a blower fan.

  In general, an air blower is provided in an indoor unit and an outdoor unit of an air conditioner. Examples of the blower fan include a turbo fan, a propeller fan, and a cross flow fan according to the application. The configuration of such a blower fan is provided with a substantially cylindrical fan boss at the center thereof, and a blade member is attached to the outer periphery of the fan boss.

The fan boss is a part that is attached to a rotating shaft of a motor that rotates a fan for blowing air. Usually, in order to reduce or block vibration from the rotating shaft of the motor, as shown in FIG. A substantially cylindrical anti-vibration member A is coaxially fitted in the hollow portion of the fan boss body 51. The anti-vibration member A includes a substantially cylindrical metal inner cylinder member 52 serving as a bearing for the rotating shaft of the motor, an anti-vibration rubber layer 53 formed on the outer peripheral surface of the inner cylinder member 52, and the anti-vibration member 53. A material composed of a substantially cylindrical metal outer cylinder member 54 covering the outer peripheral surface of the vibration rubber layer 53 has been proposed (see, for example, Patent Document 1).
JP-A-9-228993 (paragraph [0016])

  However, since the vibration isolator A for the fan boss uses many metal members (the inner cylinder member 52 and the outer cylinder member 54), there is a difficulty in reducing the weight, which is a market need. Moreover, since it is necessary to apply | coat an adhesive agent to the said metal member on the adhesive surface (the outer peripheral surface of the inner cylinder member 52, and the inner peripheral surface of the outer cylinder member 54) with the vibration-proof rubber layer 53, manufacturing cost is expensive. There is also the difficulty of becoming. In addition, the application of the adhesive tends to be uneven (application unevenness) [particularly, since the application of the adhesive to the inner peripheral surface of the cylindrical member (outer cylinder member 54) is difficult, the application becomes uneven. Therefore, the adhesion reliability of the anti-vibration rubber layer 53 is difficult to improve.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a fan boss capable of reducing the weight, reducing the cost, and improving the adhesion reliability of the vibration-proof rubber layer.

In order to achieve the above object, a fan boss of the present invention includes a substantially cylindrical or substantially annular fan boss body, and a substantially cylindrical inner cylinder member provided coaxially in a hollow portion of the fan boss body. A fan boss comprising a vibration-proof rubber layer interposed between the fan boss main body and the inner cylinder member, wherein the inner cylinder member comprises an inner cylinder made of metal and an outer cylinder made of polyamide resin. Constructed in a two-layer structure, on the outer peripheral surface of the inner cylindrical body, a ridge or concave groove extending in the axial direction is formed, and on the inner peripheral surface of the outer cylindrical body, a concave groove corresponding to the ridge Alternatively, ridges corresponding to the concave grooves are formed, the outer cylindrical body is formed by connecting a plurality of cylindrical bodies in the axial direction , and inner cylindrical bodies are provided at both axial ends of the outer cylindrical body. A stopper for restricting the sliding in the axial direction is formed, and the above The fan boss body is made of a polyamide resin, and the anti-vibration rubber layer is made of a vulcanizate of a rubber composition having the following components (A) to (D) as essential components. The outer cylindrical body constituting the cylindrical member is chemically bonded.
(A) Diene rubber or rubber having a methylene group.
(B) Vulcanizing agent.
(C) Resorcinol compound.
(D) Melamine resin.

  The present inventor has intensively studied to solve the above problems. In the course of the research, for the purpose of weight reduction, the outer part (outer cylinder) of the inner cylinder member is made while the inner part (inner cylinder) serving as the bearing of the rotating shaft of the motor is made of metal. ) Was made of polyamide resin, and the fan boss body was also made of polyamide resin. As a result, the weight can be reduced, and sufficient rigidity and strength can be obtained, and the air blowing is equivalent to that using a conventional vibration isolating member including a metal member (an inner cylinder member and an outer cylinder member). The knowledge that it can be used as a fan boss in fans such as industrial fans.

In addition, for the purpose of avoiding the use of an adhesive between the inner cylinder and the outer cylinder constituting the inner cylinder member, a protruding strip or a recess extending in the axial direction is provided on the outer peripheral surface of the inner cylinder. Research was continued with the idea of forming a groove and forming a groove corresponding to the protrusion or a protrusion corresponding to the groove on the inner peripheral surface of the outer cylindrical body. As a result, the anti-vibration rubber layer contracts toward the axis of the fan boss during vulcanization and presses the outer peripheral surface of the outer cylinder, so that the inner cylinder slides in the axial direction to the outside. The problem of protruding from the cylinder occurred. Therefore, in order to solve the problem, the outer cylindrical body is configured by connecting a plurality of cylindrical bodies in the axial direction, and these cylindrical bodies are fitted from both axial ends of the inner cylindrical body. In addition, when a stopper that restricts the sliding of the inner cylinder in the axial direction is formed at both axial ends of the outer cylinder, the knowledge that the inner cylinder does not protrude from the outer cylinder has been obtained.

  Further, for the purpose of preventing the use of an adhesive for bonding the anti-vibration rubber layer to the outer cylinder constituting the fan boss body and the inner cylinder member, a rubber which is a material for forming the anti-vibration rubber layer Recalling that an adhesive component is blended in the composition, the rubber component and the rubber component are bonded so that the adhesiveness between the fan boss body made of polyamide resin and the outer cylindrical body constituting the inner cylindrical member and the anti-vibration rubber layer is increased. As a result of various researches on combinations with adhesive components, diene rubber or rubber having a methylene group was used as the rubber component, and this was combined with a specific adhesive component (resorcinol compound and melamine resin). In addition, it was found that when a special rubber composition blended with these is vulcanized, it is chemically bonded to the polyamide resin and a strong adhesive force can be obtained, and the present invention has been achieved.

  Here, the reason why the rubber component made of the special rubber composition exhibits a strong adhesive force to the polyamide resin is presumed as follows. That is, the resorcinol compound mainly acts as a crosslinking agent, and the melamine resin mainly acts as a crosslinking aid. During the heating process, the resorcinol compound is produced by decomposition of the melamine resin. It is considered that this causes the adhesive force to be exhibited because the aromatic ring of the resorcinol compound and the amide bond (—CONH—) of the polyamide resin are crosslinked (covalent bond). This is represented by the following formula, for example.

  Therefore, in the present invention, chemical adhesion means adhesion by the crosslinking reaction. In addition, because of such chemical bonding, the anti-vibration rubber layer, the fan boss main body made of polyamide resin, and the outer cylindrical body constituting the inner cylindrical member are firmly bonded. Even if it rotates by rotation, the adhesive force is maintained, interface peeling does not occur, and the inner cylinder member does not idle with respect to the fan boss body and the vibration isolating rubber layer. In addition, the use of an adhesive can be made unnecessary by such chemical bonding, so that the adhesive application step can be omitted.

  In the present invention, the term “substantially cylindrical” is not limited to a cylindrical shape, but has a flange or the like formed on a cylindrical end edge, or a ridge or a recess on a cylindrical inner peripheral surface or outer peripheral surface. This means that a groove or the like is formed. The “substantially annular” means not only an annular shape in which a circular hole is formed concentrically in the central portion of the disc, but also an annular shape in which a through hole is formed in an annular plane portion, This means that the outer peripheral edge and the inner peripheral edge are formed in a waveform in the circumferential direction.

  In the present invention, the ridge or groove formed on the outer peripheral surface of the inner cylinder constituting the inner cylinder member is “extending in the axial direction” means that the ridge or groove is formed in parallel to the axis. And a state of being formed in a spiral with an angle with respect to the axis.

The fan boss of the present invention includes an inner cylinder member that is coaxially provided in the hollow portion of the fan boss main body, with the inner portion (inner cylinder body) serving as a bearing for the rotating shaft of the motor being made of metal. While the outer part (outer cylinder) of the member is made of polyamide resin, the fan boss body is also made of polyamide resin. And by interposing an anti-vibration rubber layer made of a vulcanized product of the special rubber composition between the fan boss main body and the outer cylinder constituting the inner cylinder member, the anti-vibration rubber layer and the above-mentioned The fan boss body and the outer cylinder constituting the inner cylinder member are chemically bonded. For this reason, the usage-amount of a metal member can be reduced, As a result, a fan boss | hub can be reduced in weight. Furthermore, it is possible to eliminate the use of an adhesive for the adhesion of the anti-vibration rubber layer, and as a result, there is no adhesive application step (possibility of uneven application of the adhesive). The adhesion reliability of the layer can be improved. And about the said inner cylinder member, while forming the protruding item | line or ditch | groove extended in an axial direction in the outer peripheral surface of the inner side cylinder body which consists of metal, the said protruding item | line is formed in the inner peripheral surface of the outer side cylinder body which consists of polyamide resin. By forming a concave groove corresponding to the concave groove or a ridge corresponding to the concave groove, it is possible to prevent the inner cylindrical body from spinning around without using an adhesive between the inner cylindrical body and the outer cylindrical body. . Further, stoppers plurality of the cylindrical body the outer tubular body is assumed to be constituted by axially connected to both axial ends of the outer cylinder, for regulating the axial sliding of the inner tubular member When forming the anti-vibration rubber layer (vulcanizing the special rubber composition), the inner cylinder can be prevented from protruding from the outer cylinder.

  Furthermore, when the outer circumferential surface of the outer cylindrical body constituting the inner cylindrical member is formed with ridges or grooves extending in the axial direction, the outer circumferential surface of the outer cylindrical body constituting the inner cylindrical member and the vibration isolation Since the adhesion area with the rubber layer is increased, the adhesion reliability is further improved. And since the said protruding item | line and a ditch | groove become resistance with respect to rotation of an inner cylinder member, the idle rotation with respect to the fan boss main body and vibration isolating rubber layer of an inner cylinder member is prevented further.

  In particular, the diene rubber (A) is selected from the group consisting of natural rubber (NR), butadiene rubber (BR), styrene-butadiene rubber (SBR), isoprene rubber (IR), and acrylonitrile-butadiene rubber (NBR). When the vulcanizing agent (B) is a sulfur-based vulcanizing agent, the cross-linking reaction is performed more smoothly, and the anti-vibration rubber layer and the polyamide resin are used. The adhesive force with the fan boss main body and the outer cylinder constituting the inner cylinder member is improved, and it is integrated more firmly.

  The rubber having a methylene group (A) is at least selected from the group consisting of ethylene-propylene-diene rubber (EPDM), ethylene-propylene rubber (EPM), and hydrogenated acrylonitrile-butadiene rubber (H-NBR). Even when the rubber is a rubber and the vulcanizing agent (B) is a peroxide vulcanizing agent, the cross-linking reaction is performed more smoothly, and the fan is composed of a vibration-proof rubber layer and a polyamide resin. Adhesive strength with the outer cylinder constituting the boss body and the inner cylinder member is improved, and the boss body and the outer cylinder are integrated more firmly.

  Next, embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to this.

  1 and 2 show an embodiment of a fan boss of the present invention. In the fan boss of this embodiment, a substantially cylindrical inner cylinder member 2 is coaxially provided in a hollow portion of a cylindrical fan boss main body 1 with an outward flange, and the fan boss main body 1 and the inner cylinder are provided. Between the members 2, a vibration-proof rubber layer 3 is bonded and integrated to the inner peripheral surface of the fan boss body 1 and the outer peripheral surface of the inner cylinder member 2. And the said inner cylinder member 2 is comprised by the two-layer structure of the inner side cylinder 2a which consists of metals, and the outer side cylinder 2b which consists of polyamide resin, Moreover, the said fan boss main body 1 consists of polyamide resin, The anti-vibration rubber layer 3 is made of a vulcanized product of a special rubber composition described later. Thereby, the said adhesion | attachment with the outer cylinder 2b which comprises the said vibration-proof rubber layer 3, the fan boss main body 1, and the inner cylinder member 2 is chemical adhesion.

Further, as shown in FIG. 3, the inner cylinder member 2 has a concave groove 21 having a V-shaped cross section formed continuously on the outer peripheral surface of the inner cylinder 2a in parallel to the axis and in the circumferential direction ( 5), on the inner peripheral surface of the outer cylindrical body 2b on the outer side, a convex strip 22 having a V-shaped cross section corresponding to the concave groove 21 is formed parallel to the axis and continuously in the circumferential direction ( (See FIG. 4). As a result, the inner cylindrical member 2a and the outer cylindrical member 2b constituting the inner cylindrical member 2 are engaged with the concave groove 21 and the ridge 22 and are relatively circumferential without being bonded by an adhesive. It is designed not to rotate. Furthermore, the outer peripheral part of the axial direction both ends of the inner side cylinder 2a is cut and formed in a small diameter part, and the step part 23 is formed over the perimeter. Further, in this embodiment, the outer cylinder 2b is configured by connecting two cylindrical bodies 2c having the same shape in the axial direction, and the cylinder corresponding to both axial ends of the outer cylinder 2b. A stopper (small diameter portion) 24 protruding inward is formed on the inner peripheral portion of one end portion of the body 2c. Each cylindrical body 2c can be externally fitted to the side where the stopper 24 is not formed from both axial ends of the inner cylindrical body 2a. By this external fitting, both axial ends of the inner cylindrical body 2a are fitted. The step part 23 of the part and the stoppers 24 at both ends in the axial direction of the outer cylinder 2b are in contact with each other, and the sliding of the inner cylinder 2a in the axial direction is restricted. Furthermore, in this embodiment, the protrusion 25 extending in the axial direction is formed on the outer peripheral surface of the cylindrical body 2c, and the anti-vibration rubber layer 3 (see FIGS. 1 and 2) adhered to the surface. ) Has a shape corresponding to the outer peripheral surface of the inner cylindrical member 2 on which the ridges 25 are formed.

  That is, as shown in FIGS. 1 and 2, in the present invention, the material for forming the outer cylinder 2b constituting the fan boss body 1 and the inner cylinder member 2 and the material for forming the vibration isolating rubber layer 3 are specified materials. By doing so, the anti-vibration rubber layer 3 and the outer cylinder 2b constituting the fan boss main body 1 and the inner cylinder member 2 are chemically bonded.

  In addition, the vibration-proof rubber layer 3 contracts toward the axis of the fan boss when it is formed (when a special rubber composition is vulcanized). The inner cylinder 2a constituting the inner cylinder member 2 is slid in the axial direction, but as described above, the two cylinders 2c are formed. Since the slide is restricted by the stopper 24 (see FIG. 3), the inner cylinder 2a does not protrude from the outer cylinder 2b. Furthermore, the chemical bonding between the vibration-insulating rubber layer 3 and the outer cylindrical body 2b constituting the inner cylindrical member 2 is strengthened by pressing the outer peripheral surface of the inner cylindrical member 2 during the vulcanization. As a result, the inner cylinder member 2 that serves as a bearing for the rotating shaft of the motor does not idle with respect to the fan boss body 1 and the vibration isolating rubber layer 3. In addition, in this embodiment, since the protrusion 25 extending in the axial direction is formed on the outer peripheral surface of the inner cylindrical member 2, the adhesion area between the outer peripheral surface of the inner cylindrical member 2 and the vibration isolating rubber layer 3 is increased. At the same time, the ridges 25 provide resistance to the rotation of the inner cylinder member 2, and the idle rotation of the inner cylinder member 2 is further prevented.

  The fan boss is formed at the center of a fan such as a blower fan, and a rotation shaft of a motor for rotating the fan is inserted into a hollow portion of the inner cylinder 2a constituting the inner cylinder member 2. Thus, it can be attached to the rotating shaft. The fan is configured by attaching a blade member to the outer peripheral portion of the fan boss (in the present invention, the flange of the fan boss main body 1) by screwing or the like.

  Here, the forming material (polyamide) of the outer cylinder 2b constituting the fan boss main body 1 and the inner cylinder member 2 and the forming material (special rubber composition) of the anti-vibration rubber layer 3 will be described in more detail.

  The polyamide which is a material for forming the fan boss body 1 and the inner cylinder member 2 is not particularly limited as long as it is a polymer compound having an amide bond (—CONH—) as a repeating unit. Can be given.

(A) by polycondensation of diamine and dibasic acid, for example, hexamethylenediamine, decamethylenediamine, dodecamethylenediamine, 2,2,4- or 2,4,4-trimethylhexamethylenediamine, 1,3 -Or 1,4-bis (aminomethyl) cyclohexane, bis (p-aminocyclohexylmethane), aliphatic, alicyclic or aromatic diamines such as m- or p-xylylenediamine and adipic acid, suberin Polyamides made from acids, sebacic acid, cyclohexanedicarboxylic acid, terephthalic acid, and aliphatic, alicyclic or aromatic dicarboxylic acids such as isophthalic acid.

(B) A crystalline or non-crystalline polyamide produced from an aminocarboxylic acid such as 6-aminocaproic acid, 11-aminoundecanoic acid, 12-aminododecanoic acid by polycondensation of aminocarboxylic acid.

(C) Polyamides produced from lactams by ring-opening polymerization of lactams, for example, ε-caprolactam, ω-dodecalactam.

  As a material for forming the fan boss body 1 and the inner cylinder member 2, in addition to the polyamide, a copolymer polyamide, a mixture of polyamides, a polymer blend of these polyamides and other resins, or the like can be used. Specific examples of the polyamide include nylon 6, nylon 66, nylon 610, nylon 612, nylon 11, nylon 12, nylon 46, a copolymer of nylon 6 and nylon 66, aromatic nylon, and amorphous nylon. can give. Among these, nylon 6, nylon 66, and aromatic nylon are preferable in terms of particularly good rigidity and heat resistance. The fan boss body 1 and the inner cylindrical member 2 are preferably set so that the flexural modulus is 6000 MPa or more and TB 120 MPa or more, and glass fiber, carbon fiber, metal fiber, whisker, viscosity mineral, etc. are blended. Can be reinforced. Further, the polyamide that is a forming material of the fan boss body 1 and the polyamide that is a forming material of the inner cylinder member 2 may be the same polyamide or different polyamides.

  A special rubber composition as a material for forming the vibration-proof rubber layer 3 includes a specific vibration-proof rubber (component A), a vulcanizing agent (component B), a resorcinol compound (component C), and a melamine resin. (Component D).

  As the specific vibration-proof rubber (component A), a diene rubber or a rubber having a methylene group is used. The diene rubber is not particularly limited. Specifically, NR, BR, SBR, IR, NBR, H-NBR, chloroprene rubber (CR), butyl rubber (IIR), chlorinated butyl rubber (Cl -IIR), brominated butyl rubber (Br-IIR) and the like. Of these, NR and NBR are preferred in view of strength and oil resistance. Specific examples of the rubber having a methylene group include EPDM, EPM, H-NBR, acrylic rubber (ACM), hydrin rubber (ECO, CO), urethane rubber, hydrogenated styrene-butadiene rubber (H-SBR). ), Silicone rubber (Q), vinyl group-containing silicone rubber (VMQ), fluorosilicone rubber (FVMQ), fluorine rubber (FKM) and the like. Of these, EPDM and H-NBR are preferred in view of strength and heat resistance.

  Examples of the vulcanizing agent (component B) include sulfur-based vulcanizing agents such as sulfur and sulfur chloride, 2,4-dichlorobenzoyl peroxide, benzoyl peroxide, 1,1-di-t-butylperoxy-3, 3,5-trimethylcyclohexane, 2,5-dimethyl-2,5-dibenzoylperoxyhexane, n-butyl-4,4'-di-t-butylperoxyvalerate, dicumyl peroxide, t-butylperoxybenzoate Di-t-butylperoxy-diisopropylbenzene, t-butylcumyl peroxide, 2,5-dimethyl-2,5-di-t-butylperoxyhexane, di-t-butyl peroxide, 2,5-dimethyl- 2,5-di-tert-butylperoxyhexyne-3,1,3-bis- (tert-butylperoxy-iso-propylene ) Peroxide vulcanizing agent such as benzene and the like. These may be used alone or in combination of two or more. Of these, sulfur and dicumyl peroxide are preferably used.

  The A component diene rubber is at least one selected from the group consisting of NR, BR, SBR, IR, and NBR, and the B component vulcanizing agent is a sulfur vulcanizing agent. Since the cross-linking reaction proceeds more smoothly, the adhesive force between the vibration-insulating rubber layer 3 and the fan boss main body 1 and the inner cylinder member 2 is improved, so that it is integrated more firmly. Further, the rubber having a methylene group as the component A is at least one selected from the group consisting of EPDM, EPM, and H-NBR, and the vulcanizing agent as the B component is a peroxide vulcanizing agent. Further, since the cross-linking reaction proceeds more smoothly, the adhesive force between the anti-vibration rubber layer 3 and the fan boss main body 1 and the inner cylinder member 2 is improved, so that it is integrated more firmly.

  The blending ratio of the vulcanizing agent (component B) is preferably in the range of 0.5 to 10 parts with respect to 100 parts by weight (hereinafter abbreviated as “part”) of the specific anti-vibration rubber (component A). That is, if the B component is less than 0.5 parts, the compression set is large because the crosslinking density is low, and the adhesiveness is low. Conversely, if the B component exceeds 10 parts, the crosslinking density is too high, This is because durability tends to decrease.

  The resorcinol compound (C component) used together with the A component and the B component is not particularly limited, and examples thereof include modified resorcin / formaldehyde resin, resorcin, resorcin / formaldehyde (RF) resin, and the like. These may be used alone or in combination of two or more. Among these, a modified resorcin / formaldehyde resin is preferably used in that it has low volatility, low hygroscopicity, and excellent compatibility with rubber.

  Examples of the modified resorcin / formaldehyde resin include those represented by the following general formulas (1) to (3). Among these, those represented by the following general formula (1) are particularly preferable.

  The blending ratio of the resorcinol-based compound (component C) is preferably in the range of 0.1 to 10 parts, particularly preferably 0.5 to 5 parts, with respect to 100 parts of the specific vibration-proof rubber (component A). is there. That is, if the C component is less than 0.1 part, the adhesion to the polyamide resin is poor, and conversely if the C component exceeds 10 parts, the physical properties of the rubber may be reduced.

  The melamine-based resin (component D) used together with the components A to C is not particularly limited as long as it mainly acts as a crosslinking aid and can donate formaldehyde. For example, methyl of formaldehyde / melamine polymer And hexamethylenetetramine. These may be used alone or in combination of two or more. Among these, a methylated formaldehyde / melamine polymer is preferably used because it has low volatility, low hygroscopicity, and excellent compatibility with rubber. These decompose under heating such as a vulcanization step and supply formaldehyde to the system.

  As the methylated product of the formaldehyde / melamine polymer, for example, those represented by the following general formula (4) are preferably used.

  Among the melamine resins (component D), a mixture of compounds represented by the general formula (4) is preferable, a compound with n = 1 is 43 to 44% by weight, and a compound with n = 2 is 27 to 27%. A mixture of 30 to 30% by weight of a compound of 30% by weight and n = 3 is particularly preferred.

  Further, the blending ratio of the resorcinol compound (C component) and the melamine resin (D component) is preferably in the range of C component / D component = 1 / 0.5 to 1/2, particularly by weight ratio. Preferably, C component / D component = 1 / 0.77 to 1 / 1.5. That is, when the weight ratio of the D component is less than 0.5, the tensile strength (TB) and elongation (EB) of the rubber tend to be slightly deteriorated, and conversely, the weight ratio of the D component exceeds 2. This is because the adhesiveness is saturated and the adhesive force is stabilized, so that even if the weight ratio of the D component is further increased, only the cost is increased, and no further effect can be expected.

  The special rubber composition preferably contains carbon black, process oil or the like in addition to the components A to D.

  The blending amount of the carbon black is preferably 30 parts or more, particularly preferably in the range of 30 to 150 parts, with respect to 100 parts of the anti-vibration rubber (component A).

  In addition to the above-mentioned components, the special rubber composition is appropriately blended with an anti-aging agent, a processing aid, a crosslinking accelerator, a white filler, a reactive monomer, a foaming agent and the like as necessary. There is no problem.

  The special rubber composition can be prepared by a conventional method using the components A to D and other components as necessary. That is, each component excluding the vulcanizing agent (component B), resorcinol compound (component C) and melamine resin (component D) is premixed and then kneaded at 80 to 140 ° C. for several minutes. Thereafter, a vulcanizing agent (component B), a resorcinol compound (component C) and a melamine resin (component D) are additionally mixed into the obtained kneaded product [in addition, a resorcinol compound (component C), a melamine resin ( D component) may be added by premixing. These are kneaded at a roll temperature of 40 to 70 ° C. for 5 to 30 minutes using rolls such as open rolls, and then dispensed to obtain a sheet-like or ribbon-like rubber.

  The fan boss of the present invention can be manufactured using, for example, the following materials.

  That is, first, an inner cylindrical body (made of metal) 2a constituting the inner cylindrical member 2 is produced. This forms a concave groove 21 having a V-shaped cross section on the outer peripheral surface of the metal cylinder by drawing the metal cylinder. Then, it cut | disconnects to predetermined length, the outer peripheral part of the axial direction both ends is cut, and the step part 23 is formed over a perimeter. The metal material of the inner cylindrical body (metal cylindrical body) 2a is not particularly limited, but a material such as brass or aluminum that can easily form the concave groove 21 by drawing is preferable.

  Next, the fan boss main body 1 is formed by molding or the like using a forming material (polyamide) of the outer cylindrical body 2b (two cylindrical bodies 2c having the same shape) constituting the fan boss main body 1 and the inner cylindrical member 2. And the outer cylinder 2b (two cylinders 2c of the same shape) is produced. Then, two cylindrical bodies 2c are fitted on the inner cylindrical body 2a constituting the inner cylindrical member 2 to produce the inner cylindrical member 2. Next, the fan boss body 1 and the inner cylinder member 2 are set at predetermined positions in the molding die for the vibration-proof rubber layer 3. And after inject | pouring the special rubber composition prepared as mentioned above in the said shaping | molding metal mold | die, it heat-vulcanizes (about 3 to 30 minutes at the temperature of 150-180 degreeC), and is bridge | crosslinked. Thereby, it is possible to obtain a fan boss in which the anti-vibration rubber layer 3 is formed between the fan boss main body 1 made of polyamide resin and the outer cylindrical body 2 b constituting the inner cylindrical member 2. The special rubber composition may be preformed in advance and then heat vulcanized by sandwiching it between the fan boss body 1 and the outer cylinder 2b constituting the inner cylinder member 2. Further, the surfaces of the outer cylinder 2b constituting the fan boss main body 1 and the inner cylinder member 2 may be subjected to a cleaning process using an alkaline cleaning liquid, or may be subjected to a wet blasting process using an alkaline cleaning liquid and an abrasive. .

In the above embodiment, the outer cylindrical body 2b constituting the inner cylindrical member 2 is configured by connecting two cylindrical bodies 2c having the same shape in the axial direction . However, the present invention is not limited to this. It may be configured by connecting three or more cylindrical bodies in the axial direction .

  Furthermore, in the said embodiment, the outer side cylinder 2b is formed in the outer peripheral surface of the inner side cylinder 2a which comprises the inner cylinder member 2, and the concave groove | channel 21 of a V-shaped cross section is continuously formed in the circumferential direction in parallel with an axis. On the inner circumferential surface, a convex strip 22 having a V-shaped cross section corresponding to the concave groove 21 is formed parallel to the axis and continuously in the circumferential direction, so that the inner cylindrical body 2a and the outer cylindrical body 2b are relative to each other. However, if the relative circumferential rotation can be prevented, the groove 21 and the ridge 22 are not limited to those described above. For example, the cross-sectional shape is U-shaped. The shape extending in the axial direction may be angled with respect to the axis, may be spiral, or may be formed intermittently at intervals in the circumferential direction. Further, a convex strip may be formed on the outer peripheral surface of the inner cylindrical body 2a instead of the concave groove 21, and the convex strip 22 is correspondingly formed on the inner peripheral surface of the outer cylindrical body 2b. Instead of this, a concave groove may be formed.

  Moreover, in the said embodiment, although the protruding item | line 25 extended in an axial direction was formed in the outer peripheral surface of the outer side cylinder 2b (cylindrical body 2c) which comprises the inner cylinder member 2, it replaces with the protruding item | line 25, and is recessed. A groove may be formed, or both the ridge 25 and the groove may be formed. Further, neither the ridge 25 nor the groove may be formed.

  Furthermore, a ridge or a groove extending in the axial direction may be formed on the inner peripheral surface of the fan boss body 1. Thereby, the idling of the anti-vibration rubber layer 3 with respect to the fan boss body 1 can be further prevented.

  Moreover, in the said embodiment, although the fan boss main body 1 was made into the cylindrical shape with an outward flange, it is not limited to this, You may make it a mere cylindrical shape, and an annular | circular shape, an annular | circular plane You may make it the thing by which the through-hole was formed in the part, and the annular | circular shaped outer periphery and inner periphery formed in the waveform in the circumferential direction.

  In the above embodiment, the fan boss main body 1 and the blade member are separated from each other. However, the fan boss main body 1 may be integrated with the blade member.

  In the above embodiment, the vibration-proof rubber layer 3 and the fan boss main body 1 and the inner cylinder member 2 are bonded by chemical bonding and no adhesive is used. An adhesive may be used.

  The fan boss of the present invention thus obtained is used as a fan boss for a blower fan (turbo fan, propeller fan, cross flow fan, etc.) provided in an indoor unit and an outdoor unit of an air conditioner, and a personal computer. It is used as a fan boss for a cooling fan, a ventilation fan or the like built in a household electric appliance.

  Next, examples will be described together with comparative examples.

[Preparation of inner cylinder constituting inner cylinder member]
By drawing out a brass cylinder (outer diameter 15 mm, inner diameter 12 mm), a V-shaped concave groove (depth 0.3 mm, width 1 mm) is formed on the outer peripheral surface in parallel to the axis and in the circumferential direction. Formed continuously. And after cutting it into axial length 30.5mm, the width of 2mm was cut from the both ends over the perimeter, and the diameter of the outer peripheral surface of the both ends was made 14mm.

[Fabrication of outer cylinder (two cylinders) constituting fan boss body and inner cylinder member]
A modified 6-nylon (Aren A335, manufactured by Mitsui Chemicals) is used for mold forming (100 ° C. × 4 minutes), and a fan boss body (see FIG. 1) made of polyamide resin and an outer cylindrical body constituting an inner cylindrical member (Two cylindrical bodies) (see FIG. 3) were produced. The dimensions of the fan boss body were an outer diameter of a cylindrical portion (a portion excluding a flange) of 45 mm and an axial length of 28 mm. The dimensions of each cylindrical body were an outer diameter of 21 mm, an inner diameter of the stopper of 14 mm, an inner diameter of 15 mm other than the stopper, and an axial length of 15.25 mm. In addition, on the inner peripheral surface of each cylindrical body, convex portions (height 0.3 mm, width 1 mm) having a V-shaped cross section are formed continuously in the circumferential direction in a portion other than the stopper. ing.

[Vibration-proof rubber layer forming material]
100 parts of NR (RSS # 3, manufactured by JSR), 5 parts of zinc oxide (ZnO), 1 part of stearic acid, 45 parts of SRF (Seast S, manufactured by Tokai Carbon Co., Ltd.), naphthenic oil (Sansen 410, 3 parts of Nippon Sun Oil Co., Ltd.) was kneaded for 5 minutes at 120 ° C. using a Banbury mixer, and then the modified resorcin / formaldehyde resin represented by the general formula (1) (Sumikanol 620, manufactured by Sumitomo Chemical Co., Ltd.) 4 parts, methylated formaldehyde / melamine polymer (Sumikanol 507A, manufactured by Sumitomo Chemical Co., Ltd.) 3.08 parts, Sunseller CZ-G (manufactured by Sanshin Chemical Co., Ltd.) 0.8 parts, sulfur vulcanizing agent ( S-ptc (manufactured by Tsurumi Chemical Co., Ltd.) and 3.45 parts were further mixed and kneaded at 50 ° C. for 10 minutes using an open roll to prepare a vibration-proof rubber layer forming material (rubber composition).

[Fan boss production]
First, two cylindrical bodies were externally fitted from both axial ends of the inner cylindrical body constituting the inner cylindrical member to produce an inner cylindrical member. Subsequently, the inner cylinder member and the fan boss main body were set at predetermined positions in the molding die for the vibration-proof rubber layer. Then, the vibration-proof rubber layer forming material (rubber composition) prepared as described above was poured into the molding die and then crosslinked by heating vulcanization (170 ° C. × 20 minutes). In this way, the fan boss shown in FIG. 1 was produced.

  Instead of the modified 6-nylon in Example 1 above, 6,6-nylon (Alamine CM3001G-45, as a material for forming the outer cylinder (two cylinders) constituting the fan boss body and the inner cylinder member Toray Industries, Inc.) was used. In addition, BR (BR02L, manufactured by JSR) was used as a vibration-proof rubber layer forming material instead of NR in Example 1 above, and the vibration-proof rubber layer forming material was prepared in the same manner as in Example 1 except that. did. And the fan boss | hub was produced like the said Example 1. FIG.

  Instead of the modified 6-nylon in Example 1 above, 6,6-nylon (Alamine CM3001G-45, as a material for forming the outer cylinder (two cylinders) constituting the fan boss body and the inner cylinder member Toray Industries, Inc.) was used. Further, as the anti-vibration rubber layer forming material, SBR (SL556, manufactured by JSR) was used instead of NR in Example 1 above, and the anti-vibration rubber layer forming material was prepared in the same manner as in Example 1 except that. did. And the fan boss | hub was produced like the said Example 1. FIG.

  Instead of the modified 6-nylon in Example 1 above, 6,6-nylon (Alamine CM3001G-45, as a material for forming the outer cylinder (two cylinders) constituting the fan boss body and the inner cylinder member Toray Industries, Inc.) was used. Further, as a vibration-proof rubber layer forming material, IR (IR2200, manufactured by JSR) was used instead of NR in Example 1 above, and the vibration-proof rubber layer forming material was prepared in the same manner as in Example 1 except that. did. And the fan boss | hub was produced like the said Example 1. FIG.

  Instead of the modified 6-nylon in Example 1 above, 6,6-nylon (Alamine CM3001G-45, as a material for forming the outer cylinder (two cylinders) constituting the fan boss body and the inner cylinder member Toray Industries, Inc.) was used. Further, the vibration-proof rubber layer forming material was replaced with the material of Example 1 above, 100 parts of NBR (N260S, manufactured by JSR), 5 parts of zinc oxide, 1 part of stearic acid, 35 parts of SRF, and phthalate type 5 parts of a plasticizer (DOP, manufactured by Daihachi Chemical Co., Ltd.) was kneaded at 120 ° C. for 5 minutes using a Banbury mixer, and then a modified resorcin / formaldehyde resin (Sumicanol 620) 4 represented by the general formula (1) 4 Part, 3.08 parts of methylated formaldehyde / melamine polymer (Sumikanol 507A), 0.8 parts of Sunseller CZ-G, and 2 parts of sulfur vulcanizing agent (S-ptc), The material for forming a vibration-proof rubber layer was prepared by kneading at 50 ° C. for 10 minutes. And the fan boss | hub was produced like the said Example 1. FIG.

  Instead of the modified 6-nylon in Example 1 above, 6-nylon (Alamine CM1011G-45, Toray Industries, Inc.) was used as a material for forming the outer cylinder (two cylinders) constituting the fan boss body and the inner cylinder member. Made). Further, the vibration-proof rubber layer forming material was replaced with the material of Example 1 above, 100 parts of EPDM (EP474, manufactured by Sumitomo Chemical Co., Ltd.), 5 parts of zinc oxide, 1 part of stearic acid, and HAF (Show Black N330). 45 parts of Showa Cabot) and 5 parts of naphthenic oil (Sansen 410) using a Banbury mixer at 120 ° C. for 5 minutes, and then modified resorcin / formaldehyde represented by the general formula (1) 4 parts of resin (Sumikanol 620), 3.08 parts of methylated formaldehyde / melamine polymer (Sumikanol 507A) and 6.75 parts of Parkmill D-40 (Nippon Yushi Co., Ltd.) are additionally mixed, and an open roll is mixed. The material for forming an anti-vibration rubber layer was prepared by kneading at 50 ° C. for 10 minutes. And the fan boss | hub was produced like the said Example 1. FIG.

  Instead of the modified 6-nylon in Example 1 above, 6,6-nylon (Alamine CM3001G-45, as a material for forming the outer cylinder (two cylinders) constituting the fan boss body and the inner cylinder member Toray Industries, Inc.) was used. Further, the vibration-proof rubber layer forming material was replaced with the material of Example 1 above, 100 parts of EPM (EP11, manufactured by JSR), 5 parts of zinc oxide, 1 part of stearic acid, and HAF (show black N330). 45 parts and 5 parts of naphthenic oil (Sansen 410) were kneaded at 120 ° C. for 5 minutes using a Banbury mixer, and then the modified resorcin / formaldehyde resin (Sumicanol 620) 4 represented by the general formula (1) 4 Part, 3.08 parts of methylated formaldehyde / melamine polymer (Sumikanol 507A) and 6.75 parts of Park Mill D-40 (Nippon Yushi Co., Ltd.) were added and mixed at 50 ° C. using an open roll. An anti-vibration rubber layer forming material was prepared by kneading for a minute. And the fan boss | hub was produced like the said Example 1. FIG.

  Instead of the modified 6-nylon in Example 1 above, 6,6-nylon (Alamine CM3001G-45, as a material for forming the outer cylinder (two cylinders) constituting the fan boss body and the inner cylinder member Toray Industries, Inc.) was used. Further, the vibration-proof rubber layer forming material is replaced with the material of Example 1 above, 100 parts of H-NBR (Zetpole 2010, manufactured by Nippon Zeon Co., Ltd.), 5 parts of zinc oxide, 1 part of stearic acid, and SRF40 Part and 10 parts of phthalate plasticizer (DOP) using a Banbury mixer at 120 ° C. for 5 minutes, and then 4 parts of a modified resorcin / formaldehyde resin (Sumicanol 620) represented by the general formula (1) , 3.08 parts of methylated formaldehyde / melamine polymer (Sumikanol 507A) and 6 parts of Peroximon F-40 (Nippon Yushi Co., Ltd.) were further mixed and kneaded at 50 ° C. for 10 minutes using an open roll. Thus, a vibration-proof rubber layer forming material was prepared. And the fan boss | hub was produced like the said Example 1. FIG.

[Comparative Example 1]
A fan boss having a substantially cylindrical vibration-proof member coaxially fitted to the fan boss main body was produced (see FIG. 5). That is, a brass inner cylinder member and an aluminum outer cylinder member were produced by drawing. On the other hand, the vibration-proof rubber layer forming material is 5 parts at 120 ° C. using a Banbury mixer with 100 parts of NR, 5 parts of zinc oxide, 1 part of stearic acid, 45 parts of SRF, and 3 parts of naphthenic oil (Sansen 410). It knead | mixed for 1 minute, Then, 0.8 parts of sun cellar CZ-G and 3.45 parts of sulfur vulcanizing agents (S-ptc) were added and mixed, and it knead | mixed for 10 minutes at 50 degreeC using the open roll. And after apply | coating the adhesive agent (Chemlock 220, the product made by Road Far East) to the outer peripheral surface of the said brass inner cylinder member and the inner peripheral surface of an aluminum outer cylinder member by spray method, they are used for vibration-proof rubber layers Was set at a predetermined position in the molding die. Next, after the vibration-proof rubber layer forming material (rubber composition) is injected into the molding die, it is crosslinked by heat vulcanization (170 ° C. × 20 minutes) to form a substantially cylindrical vibration-proof member. Obtained. Next, after applying an adhesive (Chemlock 220, manufactured by Road Far East Co.) to the outer peripheral surface of the vibration isolating member, it is coaxially fitted into the same fan boss body as in Example 1 and insert molding is performed. A boss was made.

[Mass comparison]
When the mass of each of the fan bosses of Examples 1 to 8 and Comparative Example 1 thus obtained was measured, all of the fan bosses of Examples 1 to 8 were lighter than the fan boss of Comparative Example 1. .

[Comparison of production time]
The production of the fan boss of Comparative Example 1 had a step of applying an adhesive, which took more time than the production of each fan boss of Examples 1-8.

[Comparison of adhesive strength]
With the fan boss body in each fan boss of Examples 1 to 8 and Comparative Example 1 fixed, the inner cylinder member was pulled and broken in the axial direction at a speed of 50 mm / min. The load at the time of rupture was defined as adhesive strength (MPa), and the state of the fracture surface (fracture state) was measured and evaluated. The results are shown in Table 1 below. In the column of the state of failure in the table, “R100” means that the rubber portion (R) of the vibration-insulating rubber layer is 100% broken, and “R0” means the vibration-insulating rubber layer and the inner cylinder. It means that the rupture rate of the rubber part (R) is 0% because interface peeling occurred at the interface part with the member or the outer cylinder member.

  From this result, it can be seen that each of the fan bosses of Examples 1 to 8 has higher adhesion reliability of the anti-vibration rubber layer than the fan boss of Comparative Example 1.

It is a perspective view which shows one Embodiment of the fan boss | hub of this invention. It is sectional drawing which shows the said fan boss | hub. It is the disassembled side view in which a part which showed the composition of the inner cylinder member provided in the above-mentioned fan boss fractured. It is an expanded sectional view in a section perpendicular to an axis of an outer cylinder (tubular body) which constitutes the above-mentioned inner cylinder member. It is an expanded sectional view in a section perpendicular to an axis of an inner cylinder which constitutes the above-mentioned inner cylinder member. It is sectional drawing which shows the conventional fan boss | hub.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fan boss main body 2 Inner cylinder member 2a Inner cylinder 2b Outer cylinder 3 Anti-vibration rubber layer

Claims (5)

A substantially cylindrical or substantially annular fan boss body, a substantially cylindrical inner cylinder member provided coaxially in a hollow portion of the fan boss body, and interposed between the fan boss body and the inner cylinder member A fan boss composed of an anti-vibration rubber layer, wherein the inner cylindrical member is configured in a two-layer structure of an inner cylindrical body made of metal and an outer cylindrical body made of polyamide resin, on the outer peripheral surface of the inner cylindrical body In addition, a ridge or a groove extending in the axial direction is formed, and a groove corresponding to the ridge or a protrusion corresponding to the groove is formed on the inner peripheral surface of the outer cylindrical body. The outer cylindrical body is configured by connecting a plurality of cylindrical bodies in the axial direction, and stoppers for restricting the sliding of the inner cylindrical body in the axial direction are formed at both axial ends of the outer cylindrical body, And while the said fan boss body consists of polyamide resin, The vibration-proof rubber layer is made of a rubber composition vulcanizate having the following components (A) to (D) as essential components, and a fan boss body made of the polyamide resin and an outer cylinder constituting an inner cylinder member; Fan boss characterized by chemical bonding.
(A) Diene rubber or rubber having a methylene group.
(B) Vulcanizing agent.
(C) Resorcinol compound.
(D) Melamine resin.   The fan boss according to claim 1, wherein a projecting ridge or a groove extending in the axial direction is formed on the outer peripheral surface of the outer cylindrical body constituting the inner cylindrical member.   The chemical adhesion between the anti-vibration rubber layer and the fan boss body made of polyamide resin and the outer cylinder of the inner cylinder member is obtained by using the resorcinol compound (C) as a crosslinking agent and the melamine resin (D) as described above. 3. The fan boss according to claim 1, wherein the fan boss is formed by a crosslinking reaction using a crosslinking aid.   The diene rubber (A) is at least one rubber selected from the group consisting of natural rubber, butadiene rubber, styrene-butadiene rubber, isoprene rubber, acrylonitrile-butadiene rubber, and the vulcanization of (B). The fan boss according to claim 1 or 2, wherein the agent is a sulfur vulcanizing agent.   The rubber having a methylene group (A) is at least one rubber selected from the group consisting of ethylene-propylene-diene rubber, ethylene-propylene rubber, hydrogenated acrylonitrile-butadiene rubber, and the additive (B). The fan boss according to claim 1 or 2, wherein the vulcanizing agent is a peroxide vulcanizing agent.

Images