JP2012165570A - Vibration-proof member for motor and method for manufacturing vibration-proof member for motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration-proof member for a motor, which has an excellent vibration-proof function and holding performance for the motor, and to provide a method for manufacturing the vibration-proof member for the motor.SOLUTION: A vibration-proof member 10 for a motor has a structure with a first attachment member 12 provided at a housing 91 side and a second attachment member 13 provided at a motor body 92 side integrated with each other through an elastic member 11. The elastic member 11 is an elastomer composition which has a duro type A hardness of 45 degrees or more but less than 80 degrees measured in conformity to JIS K6253, a strength of a tensile breaking point of 4.5 MPa or more and an elongation of the tensile breaking point of 300% or more measured in conformity to JIS K6251, and a compression set of 50% or less after having been compressed 25% and held for 22 hours at 70°C measured in conformity to JIS K6262.

Description

  The present invention relates to a motor vibration-proof member and a method for manufacturing a motor vibration-proof member.

  Conventionally, an anti-vibration member using an elastic member is installed between the motor and the device main body in order to suppress the vibration generated with the driving of the motor provided in the device from being transmitted to the device main body. The structure is widely adopted. In particular, small DC brushless motors and stepping motors require high mounting position accuracy. However, as shown in Japanese Patent Laid-Open No. 10-110699, when an elastic member is fastened and fixed with a bolt or the like, the elastic member is deformed. The mounting position accuracy of the motor cannot be maintained. Therefore, as shown in Japanese Patent Application Laid-Open No. 07-177701, the mounting plate of the motor and the device is integrated through the elastic member, and the mounting plate, the device and the motor are fixed to each other to fix the elastic member. The structure prevents the deformation of the motor and suppresses the vibration of the motor while maintaining high mounting position accuracy.

  An elastic member used for a vibration-proof member of a small DC brushless motor or a stepping motor as disclosed in Japanese Patent Application Laid-Open No. 07-177701 is a rubber material such as NBR (Nitril Butadiene Rubber) having high vibration-proof function, silicone, or the like. Are known. However, the vibration isolating member using NBR has a high manufacturing cost because the manufacturing process includes a vulcanization bonding process, and there is a problem in the stability of the adhesive strength. Further, silicone has a problem that the material cost is high.

  In recent years, as an alternative to rubber materials, an elastomer composition that has an excellent vibration-proof function, does not require vulcanization, has high moldability, and is easy to injection-mold and extrude. It attracts attention as a member (see, for example, Patent Document 3).

Japanese Patent Laid-Open No. 10-110699 Japanese Patent Application Laid-Open No. 07-177701 Japanese Patent No. 4512803

When considering the use of an elastomer composition as the elastic member of the vibration isolating member, in addition to a high vibration isolating function, it must have a certain level of mechanical strength that can hold the motor inside the device and a high bondability with the mounting plate. Is required. Further, since the motor inside the device reaches a maximum surface temperature of about 120 ° C. when driven, it is required to have high heat resistance.
However, generally, an elastomer composition has a problem in mechanical strength in a high-temperature atmosphere because mechanical strength rapidly decreases at about 80 to 100 ° C. In addition, metal is generally used as the mounting plate for the elastic member, but the elastomer composition has high bondability with a thermoplastic resin, but has low bondability with metal, and depending on the type of elastomer composition. Even if an adhesive is used, sufficient bondability with a metal cannot be obtained. Therefore, materials applicable as the mounting plate for the elastomer composition have been limited. For these reasons, an elastomer composition has not yet been applied particularly as an elastic member of a small motor vibration-proof member.

  This invention is made | formed in view of this point, and it aims at providing the manufacturing method of the anti-vibration member for motors which has the outstanding anti-vibration function and the holding | maintenance performance of the motor, and the anti-vibration member for motors.

As a result of intensive studies, the inventors of the present application have found, through experiments, mechanical properties of an elastomer composition that can be used as an elastic member of a vibration isolator for motors.
That is, the vibration isolating member for a motor of the present invention has a structure in which the first mounting member provided on the housing side and the second mounting member provided on the motor main body side are integrated via the elastic member. The anti-vibration member for a motor, wherein the elastic member has a duro type A hardness measured in accordance with JIS K6253 of 45 degrees or more and less than 80 degrees, and a tensile breaking point strength measured in accordance with JIS K6251 is 4. An elastomer composition having an elongation of 5 MPa or more and an elongation at break of 300% or more, and a compression set after holding at 70 ° C. for 22 hours at 25% compression measured in accordance with JIS K6262 is 50% or less It is a thing.

  When the elastomer composition has a duro type A hardness of 45 degrees or more, the amount of deformation due to the weight (self-weight) of the motor body can be further reduced, and therefore, high mounting accuracy and holding performance of the motor to the device can be obtained. On the other hand, when the durro type A hardness is 80 degrees or more, the vibration isolating function is deteriorated, so that it is not suitable as a vibration isolating member for a motor. Therefore, by using an elastomer composition having a duro type A hardness of 45 degrees or more and less than 80 degrees as an elastic member, it is possible to obtain a vibration isolation member for a motor having an excellent vibration isolation function and motor holding performance. In this case, it is more desirable to obtain an anti-vibration member for a motor having a more excellent anti-vibration function and motor holding performance by using an elastomer composition having a duro type A hardness of 50 degrees to 70 degrees as an elastic member. Can do.

Further, if the strength of the tensile break point of the elastomer composition is 4.5 MPa or more and the elongation of the tensile break point is 300% or more, sufficient motor holding performance can be ensured even when the motor generates heat. In this case, it is more preferable to obtain an anti-vibration member for a motor having excellent motor holding performance even when the motor generates heat by using an elastomer composition having an elongation at a tensile breaking point of 400 to 900% as an elastic member. it can.
Furthermore, if the compression set after holding the elastomer composition at 70 ° C. for 22 hours at 25% compression is 50% or less, the amount of deformation can be sufficiently used even if permanent deformation occurs when the motor generates heat. It can be applied as a vibration isolating member. In this case, more preferably, an elastomer composition having a compression set of 30% or less after being held at 100 ° C. for 24 hours at the time of 25% compression is used as an elastic member, so that the mounting accuracy to a high device can be increased even during motor heat generation. A motor vibration isolator that can be maintained can be obtained.

  In particular, in the vibration isolator for motors of the present invention, the elastic member can be composed of a styrene elastomer or an olefin elastomer.

  The type of elastomer composition used as the elastic member of the vibration isolator for motor is not limited. For example, styrene elastomer, olefin elastomer, urethane elastomer, ester elastomer, vinyl chloride elastomer, amide elastomer can be applied. . Among these, styrene elastomers and olefin elastomers have higher tensile strength and elongation at break at room temperature than other elastomer compositions, and their hardness is also suitable as a vibration isolator for motors. Therefore, more desirably, a styrene elastomer or an olefin elastomer is applied.

  In the motor vibration isolator of the present invention, at least one of the first attachment member and the second attachment member may be made of a metal joined to the elastic member via a resin layer.

  It is known that an elastomer composition used as an elastic member has high bondability with a resin. Therefore, through the resin layer, the elastic member made of the elastomer composition and the first mounting member and the second mounting member made of metal can be firmly joined and integrated. As the metal material used for the first mounting member and the second mounting member, steel materials, plated steel materials, aluminum, aluminum alloys, and the like can be selected. The resin layer can be formed on the first mounting member and the second mounting member by laminating or powder coating, and the type of the resin layer to be formed is one that is heat-welded to the elastomer composition (for example, a thermoplastic resin). ).

  And the vibration isolator for motors of this invention can be set as the structure from which the said resin layer becomes thickness of 0.5 mm or less.

  By setting the thickness of the resin layer to 0.5 mm or less, it is possible to suppress an increase in size and cost of the first mounting member and the second mounting member.

  Further, as a substitute for the resin layer, the joint portion of the first attachment member and the second attachment member may be modified by shot blasting or anodizing treatment in order to improve the joint strength. As a result, minute irregularities are formed, and the metal and the elastomer composition are more firmly bonded by the anchor effect.

  Furthermore, the vibration isolating member for a motor of the present invention may be configured such that the second mounting member is a part of the outer peripheral surface of the motor body.

  That is, the structure which joins the elastic member of the vibration isolator for motors directly to a motor main part may be sufficient (refer FIG. 2).

  Further, the motor vibration isolator of the present invention may be configured such that at least one of the first mounting member and the second mounting member is made of a thermoplastic resin joined to the elastic member by thermal welding.

  As described above, since the elastomer composition used as the elastic member has high bondability with the resin, the elastic member and the first mounting member can be obtained by using the first mounting member and the second mounting member made of thermosetting resin. In addition, the second attachment member can be more firmly joined and integrated by heat welding. As the thermoplastic resin used for the first mounting member and the second mounting member, a thermosetting resin (for example, polyethylene) having a certain level or more of mechanical strength for appropriately holding the motor can be selected. In this case, the elastic member, the first mounting member, and the second mounting member can be easily joined and integrated by using a double mold (two-color molding) or a hot press method.

  And this invention is the vibration isolator for motors of any one of Claim 1-5. WHEREIN: The metal member which has a thermoplastic resin layer at least on one side is installed in a metal mold | die, The said metal member A method of manufacturing a vibration isolating member for a motor, wherein the elastic member, the first mounting member, and the second mounting member are integrated by injection molding an elastomer composition on the thermoplastic resin layer side. is there.

  Injection molding (insert molding) is preferable as a method for joining and integrating the elastic member made of the elastomer composition and the first mounting member and the second mounting member made of metal, but induction overheating welding or hot pressing is used. May be.

  ADVANTAGE OF THE INVENTION According to this invention, the vibration isolator for motors which has the outstanding anti-vibration function and motor holding | maintenance performance can be obtained using the elastic member which consists of an elastomer composition.

It is the figure which showed one structural example of the attachment state of the vibration isolator for motors. It is the figure which showed the other structural example of the attachment state of the vibration isolator for motors. It is the figure which showed the outline of the tensile fracture test of the vibration isolator for motors.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

First, the attachment state of the motor main body to the housing | casing using the vibration isolating member for motors of this invention is demonstrated. FIG. 1 is a diagram showing a configuration example of a mounting state of a vibration isolator 10 for a motor according to the present invention.
The motor vibration isolator 10 has a first mounting member 12 whose one surface is bonded to the surface of the housing 91, a second mounting member 13 whose one surface is bonded to the motor main body 92, the first mounting member 12 and the second mounting member 12. The elastic member 11 is joined to the other surface of the attachment member 13.

  The casing 91 is made of a metal material selected from, for example, a steel plate, a galvanized steel plate, an aluminum plate, an aluminum die cast product, and the like, and is joined to the first mounting member 12 of the vibration isolating member 10 for the motor. The motor body 92 is, for example, a stepping motor, and its outer peripheral surface is made of a metal material selected from a steel plate, a galvanized steel plate, an aluminum plate, an aluminum die cast product, and the like. The motor body 92 is not limited to a stepping motor, and may be another motor such as a DC brushless motor. The surface of the motor main body 92 on the output shaft side is joined to the second mounting member 13 of the motor vibration isolator 10. Thus, the motor main body 92 is attached to the surface of the housing 91 via the motor vibration isolator 10. FIG. 1 shows a case where the output shaft direction of the motor main body 92 is attached to the housing 91 at a substantially right angle to the vertical direction. The vibration generated when the motor main body 92 is driven is prevented from being transmitted to the housing 91 side by the elastic member 11 of the motor vibration isolating member 10.

FIG. 2 is a view showing another configuration example of the mounting state of the motor vibration-proof member 10. In FIG. 2, the elastic member 11 is directly joined to the motor main body 92. That is, the surface on the output shaft side of the motor main body 92 is the second mounting member 13. Even with such a structure, it is possible to suppress the transmission of vibrations generated when the motor main body 92 is driven to the housing 91 side.
In this case, in order to improve the bonding strength, a resin layer having a predetermined thickness or less is provided, or the first mounting member 12 and the second mounting member 13 or the bonding portion on the output shaft side of the motor main body 92 is formed by shot blasting or anodizing. It may be modified.

  Next, the specification of the vibration isolator for motor 10 of Example 1 and the method for measuring the mechanical characteristics will be described. As the first attachment member 12 and the second attachment member 13, a polypropylene-based laminated steel sheet having a laminate thickness of 0.3 mm was applied. The first mounting member 12 and the second mounting member 13 are installed in a mold, and subsequently, the durometer A hardness measured in accordance with JIS K6253 is 60 degrees, and the tensile breaking point measured in accordance with JIS K6251. A styrene-based elastomer composition having a strength of 7.2 MPa, an elongation at break of 450%, and a compression set after holding at 70 ° C. for 22 hours at 25% compression measured in accordance with JIS K6262 is 21%. It was injected into a mold, and insert-molded so that the elastic member 11 had an outer diameter of 32 mm, an inner diameter of 22 mm, and a thickness of 3 mm. As a result, a vibration isolator 10 for a motor in which the elastic member 11 was joined between the first mounting member 12 and the second mounting member 13 was obtained.

  After holding the vibration isolator 10 for motor obtained by the above-mentioned manufacturing method at room temperature and 120 ° C. for 30 minutes, the first mounting member 12 and the second mounting member 13 are moved to a tensile tester (manufactured by IMADA) as shown in FIG. , Electric measurement stand; MV-100, digital force gauge; DSP-100R), a tensile test was performed in the thickness direction of the vibration isolator 10 for the motor, and the tensile breaking strength of the elastic member 11 was measured. Further, the motor body 92 is joined to the second mounting member 13 of the vibration isolating member 10 for the motor, and an acceleration sensor (Emic Co., Ltd., 540-DS) is attached to the first mounting member 12 and the motor body 92 to vibrate. The anti-vibration function was determined by measuring. The measurement result and the determination result will be described later.

Subsequently, the specification of the vibration isolator 20 for a motor of Example 2 and the method for measuring the mechanical characteristics will be described. As the first mounting member 22 and the second mounting member 23, the same polypropylene-based laminated steel sheet as the first mounting member 12 and the second mounting member 13 of Example 1 was applied. The first mounting member 22 and the second mounting member 23 are installed in a mold, followed by a duro type A hardness of 57 degrees, a tensile breaking point strength of 4.8 MPa, a tensile breaking point elongation of 500%, and An olefin-based elastomer composition having a compression set of 34% after being held at 70 ° C. for 22 hours at 25% compression is injected into a mold, and the elastic member 21 has an outer diameter of 32 mm, an inner diameter of 22 mm, and a thickness of 3 mm. Insert molding was performed. Thus, a vibration isolating member 20 for the motor in which the elastic member 21 was joined between the first mounting member 22 and the second mounting member 23 was obtained. The shape of the elastic member 21 was the same as that of the elastic member 11 of Example 1.
With respect to the vibration isolating member 20 for a motor obtained by the above production method, the measurement of the tensile breaking strength and the determination of the vibration isolating function were performed in the same manner as in Example 1.

Next, the specification of the vibration isolator 30 for a motor of Example 3 and the method for measuring the mechanical characteristics will be described. As the first mounting member 32 and the second mounting member 33, the same polypropylene-based laminated steel sheet as the first mounting member 12 and the second mounting member 13 of Example 1 was applied. The first mounting member 32 and the second mounting member 33 are installed in a mold, followed by a durrotype A hardness of 50 degrees, a tensile breaking point strength of 5.0 MPa, a tensile breaking point elongation of 370%, and A styrene elastomer composition having a compression set of 23% after being held at 100 ° C. for 24 hours at 25% compression was injected into a mold, and the shape of the elastic member 31 was 32 mm in outer diameter, 22 mm in inner diameter, and 3 mm in thickness. Insert molding was performed. As a result, the vibration isolator 30 for the motor in which the elastic member 31 was joined between the first attachment member 32 and the second attachment member 33 was obtained. The shape of the elastic member 31 was the same as that of the elastic member 11 of Example 1.
With respect to the vibration isolator 30 for a motor obtained by the above production method, the measurement of the tensile breaking strength and the determination of the vibration isolating function were performed in the same manner as in Example 1.

Subsequently, the specification of the vibration isolator 40 for a motor of Example 4 and a method for measuring the mechanical characteristics will be described. As the first mounting member 42 and the second mounting member 43, the same polypropylene-based laminated steel plate as that of the first mounting member 12 and the second mounting member 13 of Example 1 was applied. The first mounting member 42 and the second mounting member 43 are installed in a mold, followed by a duro type A hardness of 70 degrees, a tensile breaking point strength of 8.0 MPa, a tensile breaking point elongation of 350%, and A styrene-based elastomer composition having a compression set of 20% after being held at 100 ° C. for 24 hours at 25% compression is injected into a mold, and the elastic member 41 has an outer diameter of 32 mm, an inner diameter of 22 mm, and a thickness of 3 mm. Insert molding was performed. As a result, a vibration isolator 40 for a motor in which the elastic member 41 is joined between the first mounting member 42 and the second mounting member 43 was obtained. The shape of the elastic member 41 was the same as that of the elastic member 11 of Example 1.
With respect to the vibration isolator 40 for a motor obtained by the above production method, the measurement of the tensile strength at break and the determination of the vibration isolating function were performed in the same manner as in Example 1.

Subsequently, the specification of the vibration isolator 50 for the motor of Example 5 and the method for measuring the mechanical characteristics will be described. The first mounting member 52 and the second mounting member 53 are made of a cold rolled steel plate (SPCC) coated with polypropylene powder having a coating thickness of 0.3 mm, and the shape thereof is the first of the first embodiment. The mounting member 12 and the second mounting member 13 were the same. The first mounting member 52 and the second mounting member 53 are installed in a mold, followed by a duro type A hardness of 60 degrees, a tensile breaking point strength of 7.2 MPa, a tensile breaking point elongation of 450%, and A styrene-based elastomer composition having a compression set of 21% after being held at 70 ° C. for 22 hours at 25% compression was injected into a mold, and the elastic member 51 had an outer diameter of 32 mm, an inner diameter of 22 mm, and a thickness of 3 mm. Insert molding was performed. As a result, a vibration isolating member 50 for a motor in which the elastic member 51 was joined between the first mounting member 52 and the second mounting member 53 was obtained. The shape of the elastic member 51 was the same as that of the elastic member 11 of Example 1.
With respect to the vibration isolator 50 for a motor obtained by the above production method, the measurement of the tensile breaking strength and the determination of the vibration isolating function were performed in the same manner as in Example 1.

Comparative example

  In order to compare with Examples 1 to 5 of the present application, the following three anti-vibration member samples for motors (Comparative Examples 1 to 3) were prepared. The function was judged. In addition, the shape of the 1st attachment member, the 2nd attachment member, and the elastic member in each comparative example was made the same as Examples 1-5.

  As the specification of Comparative Example 1, a polyester-based laminated steel sheet having a laminate thickness of 0.3 mm was applied to the first mounting member and the second mounting member. In addition, as an elastic member, the compression set after holding for 24 hours at 120 ° C. at the time of compression at 25 ° C. with a durro type A hardness of 67 degrees, a tensile breaking strength of 5.0 MPa, an elongation of 200% tensile elongation A 20% ester-based elastomer composition was applied. That is, in Comparative Example 1, the elongation at break of the elastomer composition was outside the range of the present invention.

  As the specifications of Comparative Example 2, a polypropylene-based laminated steel sheet having a laminate thickness of 0.3 mm as in Example 1 was applied to the first mounting member and the second mounting member. Further, as an elastic member, Duro type A hardness 20 degrees, tensile breaking strength 5.5 MPa, tensile breaking elongation 930%, and compression set after holding at 70 ° C. for 22 hours at 25% compression is 28%. A styrenic elastomer composition was applied. That is, in Comparative Example 2, the duro type A hardness of the elastomer composition was outside the scope of the present invention.

  As the specifications of Comparative Example 3, a polypropylene-based laminated steel sheet having a laminate thickness of 0.3 mm as in Example 1 and Comparative Example 2 was applied as the first mounting member and the second mounting member. Further, as an elastic member, a duro type A hardness of 80 degrees, a tensile breaking strength of 18.1 MPa, a tensile breaking elongation of 800%, and a compression set after holding at 70 ° C. for 22 hours at 25% compression are 42%. A styrenic elastomer composition was applied. That is, in Comparative Example 2, the duro type A hardness of the elastomer composition was outside the scope of the present invention.

The specifications of the elastomer compositions in Examples 1 to 5 and Comparative Examples 1 to 3 are summarized in Table 1.

The measurement results and determination results of the mechanical properties of each sample are shown below. Table 2 shows the measurement results and determination results of Examples and Comparative Examples.

  In all the samples of Examples 1 to 5 and Comparative Examples 1 to 3, the elastic member was broken by the tensile break test. Therefore, by forming a resin layer on the first attachment member and the second attachment member by laminating or powder coating, an elastic member made of an elastomer composition and a first attachment member made of a metal material and a second attachment member It was confirmed that the bonding strength was improved. Further, in each sample after the tensile rupture test, no interfacial peeling was observed between the resin layer and the elastic member, and between the resin layer and the first mounting member and the second mounting member. Therefore, it was found that the resin layer formed by laminating or powder coating is bonded with sufficient strength to the elastic member, the first mounting member, and the second mounting member.

The evaluation of the tensile fracture test will be described. Under the conditions of the tensile rupture test in the present application, if the strength at room temperature is 500 N (Newton) or more and the strength after holding at 120 ° C. for 30 minutes is 200 N or more, the strength that is practical as a vibration isolating member for a motor is obtained. It can be judged that it has. Therefore, a sample satisfying the above-described strength requirement was determined as a non-defective product (indicated as “◯” in Table 2), and a sample that did not satisfy the strength requirement was determined as a defective product (indicated as “X” in Table 2).
The determination of the image stabilization function will be described. Under the vibration measurement conditions in this application, if the damping characteristic of the vibration isolating member in the operating frequency range of the motor is equal to or better than the damping characteristic of the current product (anti-vibration member using NBR as an elastic member), It can be determined that it has a vibration-proof function that is practical as a vibration member. Therefore, a sample satisfying the above-described vibration requirement was determined as a non-defective product (indicated as “◯” in Table 2), and a sample that did not satisfy the vibration requirement was determined as a defective product (indicated as “X” in Table 2).
A sample in which both the tensile strength at break and the anti-vibration function were non-defective was determined as non-defective in comprehensive evaluation (indicated as “◯” in Table 2). On the other hand, a sample in which either the tensile strength at break or the anti-vibration function was a defective product was determined to be a defective product by comprehensive evaluation (indicated as x in Table 2).

  From Table 2, the Duro type A hardness is 45 degrees or more and less than 80 degrees, the strength at the tensile breaking point is 4.5 MPa or more, the elongation at the tensile breaking point is 300% or more, and 22% at 70 ° C. at 25% compression. The anti-vibration members for motors 10 to 50 (Examples 1 to 5) using the elastomer composition having a compression set after holding for 50 hours or less as the elastic members 11 to 55 are all used as anti-vibration members for the motor. It was fit. On the other hand, those having a Duro type A hardness of 80 degrees or more (Comparative Example 3) were not suitable as a vibration isolating member for a motor because the vibration characteristics were deteriorated and the vibration isolating function was lowered. Further, a machine having a duro type A hardness of less than 45 degrees (Comparative Example 2) and a machine having an elongation at a tensile breaking point of less than 300% (Comparative Example 1) are sufficient machines as vibration isolating members for motors. It was incompatible because it did not have sufficient strength.

  The motor vibration isolator in the embodiment of the present application can be applied to various motors, but is particularly effective for a stepping motor.

  As described above, in the motor vibration isolating member of the present embodiment, the first mounting member provided on the housing side and the second mounting member provided on the motor body side are integrated via the elastic member. The durrotype A hardness measured according to JIS K6253 is 45 degrees or more and less than 80 degrees, the tensile breaking strength measured according to JIS K6251 is 4.5 MPa or more, and the tensile breaking point. By using an elastomer composition having an elongation of 300% or more and a compression set after holding at 70 ° C. for 22 hours at 25% compression measured in accordance with JIS K6262 as 50% or less as an elastic member Thus, it is possible to obtain a motor vibration-proof member having an excellent vibration-proof function and motor holding performance.

  Further, the vibration isolating member for a motor of the present embodiment has an elastomer composition by joining the elastic member, the first mounting member, and the second mounting member by thermal welding via a resin layer having a thickness of 0.5 mm or less. Bondability between the elastic member made of a material and the first and second mounting members made of a metal material can be enhanced.

  The above embodiments are merely examples for carrying out the present invention. Therefore, the present invention is not limited to these, and various modifications and changes can be made within the scope of the gist of the present invention described in the claims.

  For example, the shape and dimensions of the elastic member, the first mounting member, and the second mounting member of the vibration isolating member for a motor of the present invention are not limited to those of the embodiments.

  Moreover, the vibration isolator for motors of this invention may join directly the elastic member which consists of an elastomer composition, and the 1st attachment member and 2nd attachment member which consist of a metal by heat welding, without passing through a resin layer. . In this case, in order to improve each joint strength, it is desirable to modify the joint portion of the first mounting member and the second mounting member by shot blasting or anodizing.

10, 20, 30, 40, 50 Anti-vibration member for motor 11, 21, 31, 41, 51 Elastic member 12, 22, 32, 42, 52 First attachment member 13, 23, 33, 43, 53 Second attachment Member 91 Housing 92 Motor body

Claims (7)

A vibration isolating member for a motor having a structure in which a first mounting member provided on the housing side and a second mounting member provided on the motor body side are integrated via an elastic member,
The elastic member has a duro type A hardness of 45 degrees or more and less than 80 degrees measured in accordance with JIS K6253, a tensile breaking point measured in accordance with JIS K6251 of 4.5 MPa or more, and a tensile breaking point. An anti-vibration member for a motor, which is an elastomer composition having an elongation of 300% or more and a compression set after holding at 70 ° C. for 22 hours at 25% compression measured in accordance with JIS K6262.   2. The vibration isolator for motor according to claim 1, wherein the elastic member is made of a styrene elastomer or an olefin elastomer.   3. The vibration isolating member for a motor according to claim 1, wherein at least one of the first mounting member and the second mounting member is made of a metal bonded to the elastic member via a resin layer.   The vibration isolating member for a motor according to claim 3, wherein the resin layer has a thickness of 0.5 mm or less.   5. The vibration isolating member for a motor according to claim 1, wherein the second mounting member is a part of an outer peripheral surface of the motor main body.   3. The vibration isolator for motor according to claim 1, wherein at least one of the first mounting member and the second mounting member is made of a thermoplastic resin bonded to the elastic member by thermal welding. 4. In the vibration isolator for motors according to any one of claims 1 to 5,
A metal member having a thermoplastic resin layer on at least one side is placed in a mold, and an elastomer composition is injection-molded on the thermoplastic resin layer side of the metal member, whereby the elastic member and the first mounting member And the manufacturing method of the vibration isolator for motors characterized by integrating the said 2nd attachment member.

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