JP2017057907A - Vibration control rubber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a vibration control rubber from being twisted while being rotated when a device generating vibration is fixed by fixing screws through the vibration control rubber, and to enable an anti-vibration performance of the vibration control rubber to be prevented from being reduced.SOLUTION: This invention relates to a vibration control rubber 4 comprising a circular column part 41, an upper end plate 42 formed at an upper end of a circular column part 41 and a lower end plate 43 formed at a lower end of the circular column part 41. Areas S1, S2 of the sections [A-A section and B-B section] of the upper end plate 42 and the lower end plate 43 perpendicular to an axis O of the circular column part 41 are larger than an area S3 of a section [C-C section] of the circular column part 41 perpendicular to an axis O of the circular column part 41. The vibration control rubber 4 comprises a screw inserting and passing hole 44 passing through the circular column part 41 in an axial direction and a connecting wall 45 for connecting the upper end plate 42 and the lower end plate 43 protruded from an outer peripheral surface 411 of the circular column part 41.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an anti-vibration rubber that is provided between a device that generates vibration and an attachment object to which the device that generates vibration is attached, and that suppresses transmission of vibration from the device that generates vibration to the attachment object.

  Conventionally, an outdoor unit of an air conditioner has been equipped with a blower that blows out the outdoor unit after sucking outside air and exchanging heat with the refrigerant. This blower generates vibration connected to the propeller fan and the propeller fan. And a motor that is a device to be operated. This motor is fixed to a motor mounting base that is an object to be erected on the bottom plate of the outdoor unit, and vibrations generated from the motor are suppressed from being transmitted to the motor mounting base, thereby reducing the silence of the outdoor unit. Need to be increased. Therefore, as a countermeasure against this, there is known one that fixes a motor to a motor mounting base via an anti-vibration rubber.

  Thus, as a structure for fixing the motor to the motor mounting base via the vibration isolating rubber, for example, the motor has a plurality of flange portions protruding from the outer surface of the housing, and the vibration isolating rubber is fitted to the flange portion. And a slit cut out for fitting the vibration-proof rubber into the fitting hole. The anti-vibration rubber has a bobbin-like appearance, and includes a cylindrical portion, a circular upper end plate formed at the upper end of the cylindrical portion, and a circular lower end plate formed at the lower end of the cylindrical portion. And the area of the cross section perpendicular | vertical to the axis | shaft of the cylinder part of a lower end plate is larger than the area of the cross section of the cylinder part perpendicular | vertical to the axis | shaft of a cylinder part. The anti-vibration rubber has a screw insertion hole penetrating in the axial direction of the cylindrical portion, and an attachment screw is inserted into the screw insertion hole. The motor mounting base is provided with a screw hole into which a mounting screw inserted into the screw insertion hole is screwed at a position corresponding to the position of the flange portion of the motor. (For example, refer to Patent Document 1).

  This anti-vibration rubber is used to fix the motor to the motor mounting base, after fitting the cylindrical part into the fitting hole via the slit of the flange part and then fitting it into the screw hole of the motor mounting base. The lower end plate is positioned so as to match, and the mounting screw is inserted into the screw insertion hole from the upper end plate side, and the mounting screw is tightened. By tightening the mounting screw, the motor is fixed to the motor mounting base via a vibration-proof rubber in a state where the lower end plate is pressed against the motor mounting base and the upper end plate is pressed against the mounting screw. For this reason, there exists an effect which suppresses that the vibration which generate | occur | produces from a motor is absorbed by vibration-proof rubber, and is transmitted to a motor mounting base.

  However, in the anti-vibration rubber disclosed in Patent Document 1, when the motor is fixed to the motor mounting base with the mounting screw, if the mounting screw is tightened with an electric tool such as an electric screwdriver, the anti-vibration rubber is prevented from being rotated by the rotation of the mounting screw. The vibration rubber sometimes rotated. For example, after fitting the cylindrical part of the anti-vibration rubber into the fitting hole of the flange part, the mounting screw is inserted into the screw insertion hole, the mounting screw is positioned in the screw hole of the motor mounting base, and the mounting screw is Consider the case of tightening.

  In this case, as the mounting screw is tightened, the frictional force due to the contact between the top plate of the anti-vibration rubber and the seat surface of the mounting screw increases, and the friction caused by the contact between the bottom plate of the anti-vibration rubber and the motor mounting base. Strength increases. For this reason, the upper end plate of the anti-vibration rubber rotates with the mounting screw, and the cylindrical portion of the anti-vibration rubber may be twisted (in the worst case, the cylindrical portion of the anti-vibration rubber is twisted). As a result, since the motor is fixed to the motor mount with the anti-vibration rubber twisted, the anti-vibration performance of the anti-vibration rubber is reduced and vibration generated from the motor is prevented from being transmitted to the motor mount. It could not be sufficiently suppressed by the vibration rubber.

Japanese Patent Laid-Open No. 10-110699

  In view of the above-described problems, the present invention prevents the vibration isolating rubber from rotating and twisting when the device that generates vibration through the vibration isolating rubber is fixed to the mounting object with the mounting screw. An object of the present invention is to provide an anti-vibration rubber capable of preventing the performance from deteriorating.

  In order to solve the above-mentioned problems, the vibration-proof rubber of the present invention includes a column part, an upper end plate formed at the upper end of the column part, and a lower end plate formed at the lower end of the column part. The area of the cross section perpendicular to the axis of the cylindrical part of the plate is larger than the area of the cross section of the cylindrical part perpendicular to the axis of the cylindrical part, and the anti-vibration rubber is inserted through the screw in the axial direction of the cylindrical part. A hole and a connection wall that protrudes from the outer peripheral surface of the cylindrical portion and connects the upper end plate and the lower end plate are provided.

  According to the anti-vibration rubber of the present invention, when a device that generates vibration through the anti-vibration rubber is fixed to an object to be attached with an attachment screw, the anti-vibration rubber rotates and twists, and the anti-vibration performance of the anti-vibration rubber is It can be prevented from lowering.

It is explanatory drawing which shows the structure which fixes a motor to a motor mounting base with a mounting screw via the vibration-proof rubber of this invention. It is a front view which shows the structure which fixes a motor to a motor mounting base with a mounting screw via the vibration-proof rubber of this invention. It is explanatory drawing which shows the flange part of the motor housing | casing by which the vibration isolating rubber of this invention is fitted. It is explanatory drawing which shows the vibration isolator rubber of this invention, (a) is a top view, (b) is a side view, (c) is a perspective view, (d) is AA sectional drawing shown in (b), e) is a BB cross-sectional view shown in (b), and (f) is a CC cross-sectional view shown in (b). It is explanatory drawing which shows the state by which the vibration isolator rubber of this invention was fitted by the flange part of the motor housing | casing, (a) is a top view, (b) is a side view.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 to FIG. 5 are diagrams illustrating a configuration in which a vibration generating device is fixed to an attachment target object with an attachment screw via an anti-vibration rubber in the present embodiment. In the present embodiment, an outdoor unit of an air conditioner will be described as an example. The outdoor unit is equipped with a blower for sucking outside air and exchanging heat with the refrigerant and then blowing it out of the outdoor unit. The blower is connected to the propeller fan 1 and the propeller fan 1 as shown in FIGS. 1 and 2. And a motor 2 that is a device that generates vibration. The motor 2 is fixed to a motor mounting base 3 as an attachment object that is erected on the bottom plate of the outdoor unit. The motor 2 is fixed to the motor mount 3 via a vibration isolating rubber 4 in order to suppress vibration generated from the motor 2 from being transmitted to the motor mount 3.

  As shown in FIGS. 2 and 3, the motor 2 has four flange portions 22 projecting from the outer surface of the motor housing 21 as a structure for fixing the motor 2 to the motor mount 3 via the vibration isolating rubber 4. Is formed. Each of the four flange portions 22 includes a circular fitting hole 221 into which the vibration isolating rubber 4 is fitted, and an outer edge 223 of the flange portion 22 and a fitting hole for fitting the vibration isolating rubber 4 into the fitting hole 221. A slit 222 that connects 221 is formed. The anti-vibration rubber 4 is fitted into the fitting hole 221 via the slit 222 in the flange portion 22.

  As shown in FIG. 4, the anti-vibration rubber 4 includes a cylindrical portion 41, a circular upper end plate 42 formed at the upper end of the cylindrical portion 41, and a circular lower end plate 43 formed at the lower end of the cylindrical portion 41. And a screw insertion hole 44 penetrating in the axial direction of the cylindrical portion 41. Further, as shown in FIGS. 4 (d), 4 (e) and 4 (f), which are AA, BB and CC sections shown in FIG. 4 (b), the upper end plate 42 and The areas S1 and S2 of the cross section perpendicular to the axis O of the cylindrical portion 41 of the lower end plate 43 are larger than the area S3 of the cross section of the cylindrical portion 41 perpendicular to the axis O of the cylindrical portion 41. Further, the anti-vibration rubber 4 includes a connecting wall 45 that protrudes in the radial direction from the outer peripheral surface 411 of the cylindrical portion 41 and connects the upper end plate 42 and the lower end plate 43. The connecting wall 45 is connected so as to extend to the outer peripheral ends 421 and 431 of the upper end plate 42 and the lower end plate 43. The anti-vibration rubber 4 has a mounting screw 5 inserted through a screw insertion hole 44.

  As shown in FIGS. 1 and 2, the attachment screw 5 is a stepped screw having a screw head 51 with a flange 52. As shown in FIGS. 1 and 2, the motor mount 3 is formed with a pair of motor fixing plates 31 on the left and right frames 33 for fitting the outer periphery of the motor housing 21 and fixing the motor 2. Around the motor fixing plate 31, the mounting screws 5 inserted through the screw insertion holes 44 of the anti-vibration rubber 4 are screwed into positions corresponding to the positions of the four flange portions 22 of the motor housing 21 4. Two screw holes 32 are provided.

  Next, a procedure for fixing the motor 2 to the motor mounting base 3 with the mounting screw 5 through the anti-vibration rubber 4 will be described with reference to FIGS. First, as shown in FIG. 5, the cylindrical portion 41 of the anti-vibration rubber 4 is fitted into the fitting hole 221 of the flange portion 22 via the slit 222 of the flange portion 22 of the motor housing 21. At the same time, the connecting wall 45 of the anti-vibration rubber 4 is fitted into the slit 222 of the flange portion 22 of the motor housing 21. Here, since the diameter dimension of the cylindrical part 41 of the vibration isolating rubber 4 is larger than the width dimension of the slit 222 of the flange part 22 of the motor housing 21, when the cylindrical part 41 passes through the slit 222, When the cylindrical part 41 is fitted into the fitting hole 221 by being compressed and deformed so that the diameter dimension becomes the width dimension of the slit 222, the diameter dimension of the cylindrical part 41 is restored to the original and the compressive deformation is released. The Next, the lower end plate 43 side of the anti-vibration rubber 5 is positioned so that the screw insertion hole 44 and the mounting screw 5 coincide with the screw hole 32 of the motor mounting base 3. Next, the mounting screw 5 is inserted into the screw insertion hole 44 of the anti-vibration rubber 4 from the upper end plate 42 side. Finally, the mounting screw 5 is tightened using an electric tool (not shown) such as an electric screwdriver.

  In the motor 2, the anti-vibration rubber 4 is compressed between the motor mounting base 3 and the flange 52 attached to the screw head 51 of the attachment screw 5 by tightening the attachment screw 5. To the motor mount 3. In other words, the motor 2 is in a state in which the lower end plate 43 is pressed against the motor mounting base 3 and the upper end plate 42 is pressed against the flange 52 attached to the screw head 51 of the mounting screw 5 by tightening the mounting screw 5. It is fixed to the motor mounting base 3 via a vibration isolating rubber 4.

  In this case, as described in the background art, as the mounting screw 5 is tightened, the contact between the upper end plate 42 of the anti-vibration rubber 4 and the flange 52 (seat surface) attached to the screw head 51 of the mounting screw 5 occurs. In addition, the frictional force generated by the frictional force is increased, and the frictional force generated by the contact between the lower end plate 43 of the vibration isolating rubber 4 and the motor mounting base 3 is increased. As a result, the lower end plate 43 side of the anti-vibration rubber 4 is fixed to the motor mounting base 3, and the upper end plate 42 side of the anti-vibration rubber 4 rotates together with the mounting screw 5 and is transmitted to the cylindrical portion 41 so that the cylindrical portion 41 is twisted. become. However, the anti-vibration rubber 4 according to the present embodiment has a connecting wall 45 that protrudes in the radial direction from the outer peripheral surface 411 of the cylindrical portion 41 and connects the upper end plate 42 and the lower end plate 43, and the slit of the flange portion 22 of the motor housing 21. Since the upper end plate 42 of the anti-vibration rubber 4 tries to rotate as the mounting screw 5 is tightened, the upper end plate 42 of the anti-vibration rubber 4 is prevented from rotating by the connecting wall 45.

  As a result, according to the vibration isolating rubber 4 according to the present embodiment, when the motor 2 is fixed to the motor mounting base 3 with the mounting screw 5 via the vibration isolating rubber 4, the upper end plate 42 of the vibration isolating rubber 4 together with the mounting screw 5. Rotates and the cylindrical portion 41 of the anti-vibration rubber 4 is not twisted, and the motor 2 is not fixed to the motor mount 3 with the anti-vibration rubber 4 being twisted. It is possible to prevent the performance from deteriorating. Further, the upper end plate 42 of the vibration isolating rubber 4 rotates together with the mounting screw 5, and in the worst case, the cylindrical portion 41 of the anti vibration isolating rubber 4 is not threaded, thereby preventing the anti-vibration rubber from being damaged. It is possible to prevent the vibration isolation performance of the vibration isolation rubber 4 from being lowered. Further, as the mounting screw 5 is tightened, the flange 52 (seat surface) attached to the screw head 51 and the upper end plate 42 of the anti-vibration rubber 4 begin to contact, and the lower end plate 43 of the anti-vibration rubber 4 and the motor Although the mounting base 3 starts to contact with each other, the frictional force generated by these contacts is still small, so there is a possibility that the vibration isolating rubber 4 as a whole rotates together with the mounting screw 5. Rubbing or scraping due to contact with the flange portion 22 can be prevented, and deterioration of the vibration isolating performance of the vibration isolating rubber 4 can be prevented.

  In the present embodiment, the anti-vibration rubber 4 is provided with the circular upper end plate 42 and the lower end plate 43. However, the present invention is not limited to this, and other than the circular shape as long as the appearance is a bobbin shape. An upper end plate and a lower end plate having a quadrangular shape or a hexagonal shape may be provided. In the present embodiment, the connecting wall 45 of the anti-vibration rubber 4 is formed so as to extend to the outer peripheral ends 421 and 431 of the upper end plate 42 and the lower end plate 43, but the present invention is not limited to this, and the outer periphery of the cylindrical portion 41. If it protrudes from the surface 411 and can be fitted to the slit 222, the connecting wall 45 is radially extended from the outer peripheral surface 411 of the cylindrical portion 41 to the middle of the outer peripheral surface connecting the outer peripheral end 421 of the upper end plate 42 and the outer peripheral end 431 of the lower end plate 43. You may form so that it may extend. In the present embodiment, the shape of the cross section perpendicular to the axis O of the cylindrical portion 41 of the connecting wall 45 is a rectangular shape, but the present invention is not limited to this, and the shape of the slit 222 of the flange portion 22 is the same. In addition, a trapezoidal shape or a fan shape may be used. Furthermore, in this embodiment, the mounting screw 5 is a stepped screw having a screw head 51 with a flange 52. However, the present invention is not limited to this, and a step in which the screw head 51 has no flange 52 is provided. An attached screw may be used.

1 Propeller fan 2 Motor (device that generates vibration)
21 Motor housing 22 Flange 221 Fitting hole 222 Slit 223 Outer edge 3 Motor mounting base (object to be mounted)
31 Motor fixing plate 32 Screw hole 33 Frame 4 Anti-vibration rubber 41 Cylindrical portion 411 Outer peripheral surface 42 Upper end plate 421 Outer end 43 Lower end plate 431 Outer end 44 Screw insertion hole 45 Connecting wall 5 Mounting screw 51 Screw head 52 Flange O shaft S1 ~ S3 area

Claims (1)

A cylindrical portion, an upper end plate formed at the upper end of the cylindrical portion, and a lower end plate formed at the lower end of the cylindrical portion, and having a cross section perpendicular to the axis of the cylindrical portion of the upper end plate and the lower end plate The vibration isolating rubber has an area larger than an area of a cross section of the cylindrical portion perpendicular to the axis of the cylindrical portion,
The anti-vibration rubber includes a screw insertion hole penetrating in the axial direction of the cylindrical portion, and a connecting wall protruding from an outer peripheral surface of the cylindrical portion and connecting the upper end plate and the lower end plate. Vibration rubber.

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