JP2017193093A - Manufacturing method of molded article with vibration attenuation function or the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molded article with vibration attenuation function with shortening manufacturing time caused by being constituted by many components conventionally and reducing loads such as cost, and excellent in treatment property or recyclability during disposal.SOLUTION: There is adopted a manufacturing method of a molded article with vibration attenuation function, which is constituted by a first injection molding process for obtaining a first molded article constituted by a bearing part, a disc part and a joint part, a second injection molding process for inserting the same into a mold to mold a part of the vibration attenuation part by elastomer and a third injection molding process for inserting the same into the mold to integral mold the rotor, the vibration attenuation part forms an integral structure from both sides of the disc part via the communication hole and the rotor forms an integral structure from both sides of the disc part via the communication hole for rotor.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method of manufacturing an injection-molded product having a bearing portion having a vibration damping function, and more specifically, a bearing portion having a structure for damping vibration at a connecting portion that connects an output shaft of a motor and a rotating object. The present invention relates to a method of manufacturing a rotationally-molded product having an integral structure, and to a molded product, particularly a sirocco fan for air conditioning and a fan manufacturing technique used for line flow.

  For rotating objects attached to rotating output shafts, vibration-absorbing materials such as damping rubber are used between the output shaft of motors and the output shaft of acceleration / deceleration gearheads, especially in products that rotate at high speed. There are many things that use. For example, in a fan for air conditioning, when a motor such as a sirocco fan or a fan of line flow is driven by a motor, a bearing portion made by cutting a metal such as aluminum and a disk-shaped plate made of a plated metal plate are made of elastic rubber. A technique of integrating by a rubber vulcanization manufacturing method that dramatically increases the limit, and performing insert molding in the injection molding of the fan part is used.

  However, such technology requires many parts such as plating, cutting, and assembly because it involves many parts such as dissimilar materials and includes metal parts. It is extremely difficult to keep costs down.

  Further, in the prior art, a process of applying an adhesive was necessary to fix different materials, but in order to strongly bond a rubber material such as a natural rubber used for these, xylene, There are many adhesives which use toluene as a solvent, and it has an influence on a worker's human body, and it is not preferable to use these materials also from a viewpoint of preventing a working environment from deteriorating.

  Therefore, there is a current situation that the bearing portion is supported by using a metal material that is lightweight and excellent in machinability such as aluminum. In addition, the rubber part for damping vibration exhibits a vibration absorbing function by rubber granulation molding that improves the elastic limit of the rubber, and these problems are solved by the technology that makes the bearing part and the disk part an integral structure. Have responded to.

  However, even if it is lightweight aluminum, it will become heavier in weight compared with resin. In addition, the rubber material cannot avoid a decrease in vibration absorption characteristics due to aging.

  In view of the above problems, various technical proposals have been made in addition to the inventors of the present application. For example, Patent Document 1 describes a “torsional vibration damper” that is intended to provide a torsional vibration damper capable of obtaining high damping against torsional vibration, and is a known technique. Specifically, a hub attached to the rotating shaft, an annular mass body concentrically arranged with the hub, and a plurality of elastic bodies made of elastomer that elastically connect the hub and the mass body are provided. The invention is characterized in that a fluid sealing chamber in which a viscous fluid is sealed is defined between the hub, the mass body, and the plurality of elastic bodies.

  In Patent Document 2, the metal plate only needs to be a single material, and the elastic body for vibration isolation only partially covers a part of the plate, thereby saving the size of the metal plate as much as possible. Further, it is an object to provide an anti-vibration mount that reduces the amount of use of an elastic body and further provides an anti-vibration elastic body on the inner periphery of a mounting hole such as a tightening screw so that the entire body can be formed thin. "Anti-vibration mount" is described and is a known technique. Specifically, mounting holes are drilled on the left and right sides of the upper surface that has a central hole and abuts one mounting body that has upper and lower mounting holes, and the lower surface that is formed through a step from this surface. The elastic body is attached to the inner peripheral surface of the left and right mounting holes, the lower surface including the inner peripheral surface, and the opposite back surface including the inner peripheral surface. An anti-vibration mount according to the present invention is characterized in that it can be fixed by a tightening member that is in contact with the other vibration member through the mounting hole and is inserted into the mounting hole.

  Patent Document 3 aims to provide a motor fan shroud coupling structure that can reduce vibration energy generated from a fan motor to reduce transmission to the passenger compartment side and reduce manufacturing costs. Techniques relating to the motor fan shroud coupling structure are described and are well known. Specifically, the upper and lower opening edges of the opening in the radiator core support body and the two cylinders of the skirt in the motor fan shroud are connected to each other by four vibration absorbing parts formed in a substantially bellows cross section. In this state, the vibration energy generated from the fan motor is reduced in the vibration absorbing portion by being integrally molded with resin.

  However, any technical content described in Patent Document 1 to Patent Document 3 described above suggests a description of a technique that can exhibit the function of attenuating vibration while reducing the number of processes and parts as in the present invention. However, it can be said that there is still a demand for a technique that can be performed as well as the conventional technique, but the problem has not yet been solved.

  Usually, the insert molding method is a method used when a metal and a resin are integrally molded. However, when the metal and the resin are integrally molded, the metal member taken inside may slip between the resin covering the outside. When such slipping occurs, the output from the motor or the like is not transmitted effectively, which also causes vibration. Furthermore, since there is a limit in weight reduction, there is a problem that these must be solved.

  Therefore, in order to solve the above problem, the present inventor can reduce the number of parts and reduce the burden of the manufacturing process by including all these elements in the resin molding process and simultaneously manufacturing by injection molding. Focusing on the possibility of being able to do so, we have come up with a technical proposal for a "molded product with vibration damping function" that takes advantage of the damping characteristics of elastomers and the molding technology of fine shapes using resin, utilizing the fluidity that is also a feature of injection molding.

JP 2001-12550 A JP2012-219827 Japanese Patent Laying-Open No. 2005-262979

  The present invention ensures vibration damping performance in order to shorten manufacturing time and reduce burdens such as costs due to the fact that it is composed of a large number of molded parts with vibration damping function, which has been a problem in the past. However, it is an object of the present invention to provide a molded product with a vibration damping function that greatly reduces the manufacturing time and the manufacturing cost and is excellent in the processability and recyclability at the time of disposal.

  The molded product with a vibration damping function according to the present invention includes a bearing portion having a bearing hole for inserting and fixing the output shaft, a plurality of communication holes for fixing to the rotating body, and a circle having a communication hole for the rotating body. A first injection molding step of integrally molding a first molded product composed of a plate portion and a connecting portion connecting the space between the bearing portion and the disc portion by injection molding; and the first injection molding step. The obtained first molded product is inserted into a mold, and the second molded product obtained by the second injection molding step and the second injection molded step of integrally molding the vibration damping part by an elastomer, And a third injection molding step of integrally molding the rotating body by being inserted into a mold, wherein the vibration damping portion forms an integral structure from both sides of the disk portion via the communication hole, and the rotating body Through the communication hole for the rotor It was manufacturing method comprising an integral structure from the side.

  According to the present invention, in the first molded product that is integrally molded by the first injection molding step, the bearing portion includes a second disc portion parallel to the disc portion, and the joint portion is the disc. It is also possible to employ means for connecting the portion and the second disc portion in the axial direction.

  Further, the present invention may employ means in which the connecting portion connects the bearing portion and the disc portion in the radial direction from the axial center.

  Further, the present invention provides a bearing part having a bearing hole for fixing the output shaft, a disk part having a large number of communication holes and a communication hole for a rotating body, and a space between the bearing part and the disk part. The vibration damping part is disposed in a bearing unit having a connecting part through the communication hole so as to sandwich the disk part from both sides, and the rotating body mounting part is provided through the communication hole for the rotary body. However, it can also be set as the rotary body with a vibration damping function of the structure arrange | positioned so that the said disc part may be inserted | pinched from both sides.

  In the present invention, the bearing portion includes a second disc portion parallel to the disc portion, and the connecting portion connects the disc portion and the second disc portion in the axial direction. A rotating object with a vibration damping function can also be used.

  Moreover, this invention can also be set as the rotary body with a vibration damping function which is a structure which the said connection part connects to the inner edge part of the said disk part toward the radial direction from the outer periphery of the said bearing part.

  Further, the present invention is characterized in that the rotating body is an air conditioning fan, and the fan can be a rotating object with a vibration damping function related to a blower fan such as a line flow, a sirocco fan, or a turbo fan. .

  According to the molded product with a vibration damping function using the manufacturing method according to the present invention, the vibration is reduced and the performance of the operation having the damping effect is improved.

It is a flowchart which shows each process of the manufacturing method of the molded article with a vibration damping function which concerns on this invention. It is explanatory drawing which shows the conventional product of a molded product with a vibration damping function. It is structure explanatory drawing which shows the structure of the molded article with a vibration damping function which concerns on this invention. It is Example explanatory drawing which shows the state which used the molded article with the vibration damping function which concerns on this invention for the sirocco fan. It is structure explanatory drawing which shows another structure of the molded article with a vibration damping function which concerns on this invention. It is Example explanatory drawing which shows the state used for the shaft type crossflow fan of the molded article with a vibration damping function which concerns on this invention.

  The molded product with vibration damping function of the present invention ensures vibration damping performance in order to reduce the number of parts and processing steps that have been problematic in the past, and to reduce the manufacturing time problem and cost burden caused by them. However, bearing parts and circles, which were previously required, were aimed at providing molded products with a vibration damping function that greatly reduced manufacturing time and manufacturing costs, and also had excellent disposal and recyclability during disposal. The greatest feature is that the plate portion is integrally formed to increase the accuracy of aligning the shaft core, and a connecting portion that does not impede the damping function is provided so that the damping function by the elastomer is sufficiently exhibited. The present invention will be described below with reference to FIGS. Although the motor is not shown in the drawing, the motor viewed from the motor side will be described as a plan view and the side view as viewed from the direction perpendicular to the shaft, with the motor disposed on the upper side in the axial direction.

  The overall shape of the molded article with vibration damping function and the shape of each part shown in the present embodiment are not limited to the embodiments described below, but are within the scope of the technical idea of the present invention, that is, the same. It can change within the range of the shape and dimension which can exhibit an effect.

  FIG. 1 is a flowchart showing the steps of a method for manufacturing a molded article 1 with a vibration damping function according to the present invention.

  FIG. 1A is a flowchart showing each process and the overall flow of the manufacturing method according to the present invention. FIG. 1B shows each process and the overall flow of the conventional manufacturing method for comparison. FIG. As shown in FIG. 1 (a), the present invention includes a first injection molding process A, a second injection molding process B, and a third injection molding process C. Specifically, the first injection molding process A In the second injection molding step B, the first molded product 30 is insert-molded in the first molded product 30 that is integrally molded with the resin as a whole to obtain the second molded product 45 in the second injection molding step B. Molded product with vibration damping function by the third injection molding process C, which shows the molding process B and insert-molds the second molded product 45 obtained by the second injection molding process B to injection-mold the rotating body 50 1 is obtained. Comparing FIG. 1 (a) and FIG. 1 (b) clearly shows that the number of steps in FIG. 1 (a) is small.

  In addition, since the conventional technique shown in FIG. 1B includes an adhesion process, there is a risk of deteriorating the worker's working environment, and more time is required for curing, which requires more manufacturing time. There's a problem. On the other hand, in the method according to the present invention, the first injection molding step A, the second injection molding step B by insert molding, and the third injection molding step C by insert molding are very simple steps. Since it can be integrally formed using various types of raw materials, it does not deteriorate the worker's working environment, shortens the work time, reduces costs, and does not contain metal, making it easy to recycle. It is a manufacturing process that also exhibits excellent effects such as.

  Next, the manufacturing process which concerns on this invention is demonstrated based on FIG.1, FIG.3, FIG.5 and FIG. The manufacturing method according to the present invention is roughly divided into three injection molding steps. The description will be divided into three parts: a first injection molding process A, a second injection molding process B, and a third injection molding process C.

(First Injection Molding Process A) See FIG. 1A and FIG. 3. In the first injection molding process A, the bearing portion 10, the connecting portion 15, and the disk portion 20 are integrated and molded as one injection molding process. It is a process to do. In the conventional manufacturing method, since the bearing portion 10 and the disc portion 20 are each made of metal, the process in which these parts are manufactured by cutting or pressing is integrated in one injection molding in the present invention. The molded first molded product 30 is obtained. Hereinafter, the configuration of each part of the first molded product 30 integrally molded in the first injection molding step A will be described.

  The bearing portion 10 is a member that transmits power by attaching and fixing an output shaft 12 (FIG. 6) such as a motor (FIG. 6). Generally, a press-fitting method by fitting tolerances, a key and a key groove It is a structure that is fixed so as not to cause slipping or the like by a fixing method or the like. A second disc portion 24 (FIG. 3) is integrally formed in the bearing portion 10 as necessary, and a communication hole 21 is formed in the second disc portion 24 similarly to the disc portion 20 (FIG. 3). Is provided. The bearing portion 10 preferably has an output shaft fixing portion. The output shaft fixing portion is formed with a screw portion and fixed by a screwing member, a slip stopper such as a serration or a spline, or a hole. Pinning using a pin can be considered. In other words, any structure that can prevent the output shaft 12 from idling in the bearing hole 11 may be used.

  The disk portion 20 is a portion corresponding to a metal plate of a conventional product, and is formed integrally with the bearing portion 10 via the connecting portion 15 in the first injection molding step A. The holes 21 and the communication holes 22 for the rotating body are provided at a plurality of locations on each circumference.

  The connecting portion 15 is a member that connects the space region between the bearing portion 10 and the disc portion 20, and is a cross-linked body that holds the mutual axis and has a thickness that does not hinder vibration attenuation due to the elastomer. is there. In addition, the cross-linked body is provided with a second disk part 24 parallel to the disk part 20 in the bearing part 10 as shown in FIG. 3, and between the second disk part 24 and the disk part 20. It can also be set as the structure connected in parallel to an axial direction, or the structure connected radially toward the circumferential direction as shown in FIG.

  It is also effective to form the connecting portion 15 in a substantially S-shaped shape as shown in FIG. 5A, which absorbs vibration between the bearing portion 10 and the disc portion 20. It is made into the shape with the bending part for making it easy to do. However, it is not limited to the shape bent in a substantially S shape as shown in FIG. 5 (a), and the cross-linking structure can hold the shaft core and hinder the vibration damping function of the elastomer. If not, it may be a linear shape or other shapes.

(Second Injection Molding Process B) See FIGS. 3 and 5 In the second injection molding process B, conventionally, the bearing portion 10 and the disk portion 20 are integrally connected by a rubber vulcanization method, and the vibration of the rubber portion 60 is related. The process that has exhibited the effect by the damping function is a process that replaces the elastomer, and the first molded product 30 obtained by the first injection molding process A is inserted to form the vibration damping part 40 by the elastomer. This is a step of integrally molding the product 30 so as to cover it. In this process, when the elastomer flows, the vibration damping part 40 is integrally formed so as to penetrate the disk part 20 from both sides via the communication hole 21, and the first molded product 30 and the vibration are formed through the communication hole 21. The damping part 40 is provided with a non-slip structure that does not idle. Therefore, the bonding process which is a problem of the prior art is unnecessary.

  In addition, as a rubber material used in the rubber vulcanization manufacturing process by the conventional manufacturing method, neoprene rubber WX-J type is often used, and the vibration damping function of the rubber material in the vibration damping unit 40 according to the present invention is provided. Therefore, it is necessary to use an elastomer that replaces the rubber material, and the rubber material must have a hardness of around 55 to ± 5 as defined in the JISK6253 standard for the rubber material. It is necessary to be an elastomer that can exhibit a damping function equivalent to or higher than that of other rubbers.

  Conventionally, a resin material is used as an alternative member of the metal portion used in the bearing portion 10 and the disc portion 20, and injection molding materials for forming such a structure with resin include PA, PBT, PC, PPS, PPE, PEEK, PET, SPS, etc. are used, and an elastomer is used for the rubber part 60 used as a conventional vibration damping material. For such elastomers, elastomers having the characteristics of exhibiting the vibration damping function that rubber has conventionally had will be selected. Elastomers include styrene-based, olefin-based, polyester-based, and polyurethane-based elastomers. Polyurethane, which is a very old material, has characteristics such as excellent wear resistance and elasticity, and can be said to be a material that can be easily applied as a vibration absorbing material. Also, since styrene is flexible, stretchable and lightweight, it is suitable for use as a material for the vibration damping part 40 according to the present invention.

  Table 1 below shows the results of rotational balance measurement in order to demonstrate that the elastomer is suitable as a material. As shown in the results of Table 1, although there was no significant difference in peripheral runout, the balance measurement was about 17.1% for the static balance, about 27.8% for the left dynamic balance, and The unbalance is reduced to about 37.6% in the dynamic balance on the right side, and even if any of the maximum value (MAX), minimum value (MIN), and value average value (AVE) is compared, it is a vibration damping material. It was confirmed that it had vibration damping characteristics equivalent to or better than conventional products using rubber.

The measurement conditions were as follows: the number of revolutions was 1400, the cross-flow fan was used for the molded product to be rotated, the FH-216GS made by Mitutoyo was used for the measuring instrument, and the test object was molded rubber granules on a metal plate The static balance, the left and right of the dynamic balance, and the phase difference were measured for a total of 20 of 10 conventional products and 10 combinations of elastomer and resin using the manufacturing method of the present application.

(Third injection molding process C)
The third injection molding step C is a step of inserting the second molded product 45 and injection molding the rotating body 50. In this process, the resin disc portion 20 is injection-molded so that the rotating body 50 covers the both sides, and the second molded product 45 and the rotating body 50 become an integral structure. Further, in the third injection molding step C, since the rotating body communication hole 22 is provided in the resin filling region to be the resin-made rotating body 50, the third injection hole 22 is provided via the rotating body communication hole 22. The molded product 55 is integrally formed. In addition, the second molded product 45 and the rotating body 50 are provided with an anti-slip structure in which the second molded product 45 and the rotating body 50 do not slip through the communication hole 22 for the rotating body or the anti-slip groove 23.

  FIG. 2 is an explanatory view for explaining constituent members of each part in the case of manufacturing a rotary body molded product having a vibration damping function in the related art, and each used in the prior art in the description of FIG. The structural member is shown.

  FIG. 3 is a structural explanatory view showing the basic structure of the molded article 1 with vibration damping function according to the present invention, FIG. 3 (a) is a plan view of the first molded article 30, and FIG. 3 (b) is the second molded article. FIG. FIG. 3A shows a first molded product 30 in which the bearing portion 10, the disc portion 20, and the connecting portion 15 are integrally formed of resin by the first injection molding process A. FIG. 3B shows a second molded product 45 that has become an integral structure by the second injection molding process B so that the vibration damping part 40 covers the first molded product 30. The normal hatched part is the cross section of the first molded product 30, and the cross hatched part is the vibration damping part 40 molded using the second injection molding process B, and the second injection molding process B Shows that the first molded product 30 obtained by the first injection molding step A is manufactured integrally with the vibration damping portion 40 by insert molding.

  FIG. 4 is an embodiment explanatory view for explaining an example of a sirocco fan having the vibration damping structure of the molded article 1 with a vibration damping function according to the present invention. 4A is a plan view of the third molded product 55, and FIG. 4B is a cross-sectional view thereof. The disk portion 20 of the second molded product 45 is in a state where the rotating body 50 (sirocco fan) is integrated as a whole through the rotating body communication hole 22 while covering both sides of the disk portion 20. Although not shown above, it is also desirable to have a non-slip groove 23 that exhibits the same effect as the communication hole 22 for the rotating body.

  FIG. 5 is a structural explanatory view showing the first molded product 30 and the second molded product 45 when the molded product 1 with vibration damping function according to the present invention is a cross flow fan. Fig.5 (a) is a top view of the 1st molded article 30, FIG.5 (b) is the sectional drawing. The connection part 15 in Fig.5 (a) shows the shape at the time of employ | adopting the structure where the member which connects the space area | region between the bearing part 10 and the disc part 20 is connected radially toward the circumferential direction, and the connection concerned The reason why the portion 15 has a substantially S-shaped bent portion is that the shape which does not hinder the vibration damping function of the vibration damping portion 40 is taken into consideration, and is not particularly limited to the shape shown in the drawing. The reason for adopting such a configuration is that in the case of a cross flow fan, position deformation due to contraction is prevented and concentricity is provided.

  FIG. 6 is an embodiment explanatory view for explaining an example of a cross flow fan provided with the vibration damping structure of the molded article 1 with a vibration damping function according to the present invention. 6A is a plan view of the third molded product 55, and FIG. 6B is a cross-sectional view thereof. The disk portion 20 of the second molded product 45 is in a state in which the rotating body 50 (cross-flow fan) is entirely integrated through the rotating body communication hole 22 while covering both sides of the disk portion 20. In FIG. 6B, since a large number of individual double fans each having a continuous cross flow fan are arranged, the opposite side is omitted. The shaft that communicates with the central portion of the cross flow fan is not inserted into the bearing portion 10 according to the present invention, and is separate from the shaft that communicates with the output shaft 12 on the motor side.

The molded product with vibration damping function according to the present invention enables the production of an injection-molded product having an integral structure using a thermoplastic material, so that weight reduction, cost reduction, and vibration damping characteristics, which are conventional problems, are exhibited. Because of its durability, it is a technology widely used for air conditioning fans, etc., and can be applied to industrial parts that require vibration suppression in addition to air conditioning fans. Is a big one.

DESCRIPTION OF SYMBOLS 1 Molded product 10 with vibration damping function Bearing part 11 Bearing hole 12 Output shaft 15 Connecting part 20 Disk part 21 Communication hole 22 Rotating body communication hole 23 Non-slip groove 24 Second disk part 30 First molded part 40 Vibration damping Part 45 Second molded product 50 Rotating body 55 Third molded product 60 Rubber part A First injection molding process B Second injection molding process C Third injection molding process

Therefore, there is a current situation that the bearing portion is supported by using a metal material that is lightweight and excellent in machinability such as aluminum. Further, the rubber portion for being damped vibration causes exhibit vibration absorbing function of rubber vulcanization molding to improve the elastic limit of the rubber, these problems by techniques an integral structure bearing portion and the disc portion Have responded to.

The molded product with a vibration damping function according to the present invention includes a bearing portion having a bearing hole for inserting and fixing the output shaft, a plurality of communication holes for fixing to the rotating body, and a circle having a communication hole for the rotating body. A first injection molding step of integrally molding a first molded product composed of a plate portion and a connecting portion connecting the space between the bearing portion and the disc portion by injection molding; and the first injection molding step. The obtained first molded product is inserted into a mold, and the second molded product obtained by the second injection molding step and the second injection molded step of integrally molding the vibration damping part by an elastomer, a third injection molding step for integrally molding the rotary body is inserted into the mold, is composed of three injection molding process, the vibration attenuating portion of the unitary structure from both sides of the disc portion via the communication hole And the rotating body is connected to the connecting body for the rotating body. It was manufacturing method comprising an integral structure from both sides of the disc portion through the hole.

Further, the present invention provides a bearing part having a bearing hole for fixing the output shaft, a disk part having a large number of communication holes and a communication hole for a rotating body, and a space between the bearing part and the disk part. It possesses a connecting portion, the said bearing portion comprises a second circular disk parallel to the disc portion, the connecting portion connecting the said second circular plate portion and the disc portion axially structure connecting In the bearing unit, the vibration damping portion by the elastomer is disposed through the communication hole so as to sandwich the disk portion from both sides, and the mounting portion of the rotating body is disposed through the communication hole for the rotating body. It can also be set as the rotary body with a vibration damping function of the structure arrange | positioned so that a part may be inserted | pinched from both sides.

A method for manufacturing a molded article with a vibration damping function according to the present invention includes a bearing portion having a bearing hole for inserting and fixing an output shaft, a plurality of communication holes for a rotating body and vibration damping for fixing the rotating body. A disk part having a plurality of communication holes for fixing to the part, a second disk part parallel to the disk part, and a connecting part for connecting the disk part and the second disk part in the axial direction A first injection molding step A for integrally molding a first molded product constituted by injection molding, and the first molded product obtained by the first injection molding step A are inserted into a mold to form an elastomer. A second injection molding step B in which the vibration damping part is integrally molded, and a third injection in which the second molded product obtained by the second injection molding step B is inserted into a mold and the rotating body is integrally molded. The vibration damping portion is formed by three injection molding processes, a molding process C and While sandwiching the disk portion from both sides through the communication hole, form a unitary structure by connecting between the said disc portion second circular disk, the rotary body of the rotary-body communication hole Thus, a manufacturing method having an integrated structure from both sides of the disk portion is provided.

Further, the present invention is a rotating object having a vibration damping function in which a bearing unit and a rotating body are integrally formed of an elastomer, and the bearing unit has a bearing hole for fixing an output shaft. A bearing part, a disk part having a large number of communication holes and a communication hole for a rotating body, a second disk part parallel to the disk part, and the disk part and the second disk part in the axial direction And the elastomer sandwiches the disk part from both sides and forms an integral structure connecting the disk part and the second disk part, and the communication hole In addition, the bearing unit, the rotating body, and the elastomer may be integrated with each other through the communication hole for the rotating body .

Claims (7)

A bearing portion 10 having a bearing hole 11 for inserting and fixing the output shaft 12,
A disk portion 20 having a large number of communicating holes 21 for fixing to the rotating body 50 and communicating holes 22 for the rotating body;
A connecting portion 15 connecting the space between the bearing portion 10 and the disc portion 20;
A first injection molding step A for integrally molding a first molded product 30 comprising:
A second injection molding step B in which the first molded product 30 obtained by the first injection molding step A is inserted into a mold and the vibration damping portion 40 is integrally molded by an elastomer;
A third injection molding step C in which the second molded product 45 obtained by the second injection molding step B is inserted into a mold to integrally mold the rotating body 50;
Consisting of
The vibration attenuating portion 40 has an integral structure from both sides of the disc portion 20 through the communication hole 21, and the rotating body 50 is from both sides of the disc portion 20 through the communicating hole 22 for the rotating body. A method for producing a molded product with a vibration damping function, characterized by having an integral structure. In the first molded product 30 that is integrally molded by the first injection molding step A, the bearing portion 10 includes a second disc portion 24 that is parallel to the disc portion 20, and the connecting portion 15 is the disc. The method for manufacturing a molded article with a vibration damping function according to claim 1, wherein the portion 20 and the second disc portion 24 are connected in the axial direction. The method for manufacturing a molded article with a vibration damping function according to claim 1, wherein the connecting portion 15 connects the bearing portion 10 and the disc portion 20 in a radial direction from an axial center. A bearing portion 10 having a bearing hole 11 for fixing the output shaft 12;
A disc portion 20 having a large number of communication holes 21 and a communication hole 22 for a rotating body;
A connecting portion 15 connecting the space between the bearing portion 10 and the disc portion 20;
In bearing unit with
The vibration damping part 40 is disposed so as to sandwich the disk part 20 from both sides through the communication hole 21;
A mounting portion of the rotating body 50 is disposed so as to sandwich the disk portion 20 from both sides through the communication hole 22 for the rotating body,
Rotating object with vibration damping function characterized by The bearing portion 10 includes a second disc portion 24 parallel to the disc portion 20,
The rotating object with a vibration damping function according to claim 4, wherein the connecting part 15 is configured to connect the disk part 20 and the second disk part 24 in the axial direction. 5. The rotating object with a vibration damping function according to claim 4, wherein the connecting part 15 is configured to connect from the outer periphery of the bearing part 10 to the inner edge of the disk part 20 in a radial direction. The rotating body with a vibration damping function according to claim 4, wherein the rotating body 50 is an air conditioning fan.