JP2011220371A - Dynamic damper system and dynamic damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a dynamic damper to effectively suppress vibration transmission of a frequency of comparatively high frequency.SOLUTION: In a dynamic damper system 10, a mounting bracket 12 extending from an inverter 8 side as a vibration source to a vehicle body side as a target to which vibration transmission is to be suppressed, and a dynamic damper 30 at a connection fixed position 20 with the mounting bracket 16 extending from the vehicle body side to the inverter 8 side are installed. The mounting brackets 12, 16 are provided with connection seats, respectively, for restricting the connection fixed positions. The dynamic damper 30 includes: a fastening member 40 for fastening a connection seat of the mounting bracket 12 and a connection seat of the connecting fitting 16, which are superimposed at the connection fixed position; a spring 50 extending form one end to another end with a fastening part of the fastening member as the one end; and a mass weight 60 provided at a front end of the another end of the spring 50.

Description

  The present invention relates to a dynamic damper system and a dynamic damper, and more particularly to a dynamic damper system and a dynamic damper used when a vibration source and an object whose vibration transmission is to be suppressed are connected.

  For example, some devices mounted on a vehicle generate vibration, and when this is transmitted to a vehicle body or the like, vibration, noise, or the like may occur in the vehicle. Therefore, a dynamic damper or the like is used so that the vibration from the vibration source is not transmitted to the vehicle body or the like.

  For example, Patent Document 1 points out that when rubber is used as a dynamic damper, there is a limit in hardness and it cannot effectively cope with high frequencies. Here, a structure is disclosed in which two slits are provided between an engine side mounting portion and a vehicle body side mounting portion of a bracket of a dynamic damper to form a leaf spring portion, and a weight member is mounted and fixed thereto.

  Patent Document 2 points out that if an adhesive is used for the dynamic damper, a contact failure of other electronic components may occur due to a halogen component contained therein. Here, for a dynamic damper applied to a vehicle rearview mirror with built-in electronic components, its mounting bracket and mass bracket are connected by a coil spring, and a rubber elastic material is disposed around the coil spring in a non-adhesive manner. Sometimes, it is stated that the natural length of the rubber elastic body is slightly longer than the natural length of the coil spring so that a compression force is applied to the rubber elastic body in advance. As a non-adhesive arrangement, it is stated that a coil spring and a rubber elastic body may be integrally formed.

Japanese Utility Model Publication No. 6-73492 JP 2007-198477 A

  In the prior art, many are used at a relatively low frequency of about several hundred Hz. By the way, when trying to suppress vibration of a relatively high frequency of several kHz to 10 kHz or more using a dynamic damper, depending on the length of a mounting member such as a bracket to which the dynamic damper is attached, a large number of vibrations and nodes on the mounting member are present. May occur and the resonance of the dynamic damper cannot be transmitted well.

  An object of the present invention is to provide a dynamic damper system and a dynamic damper capable of effectively suppressing transmission of vibrations having a relatively high frequency.

  A dynamic damper system according to the present invention is a connection member extending from a vibration source side toward an object side on which vibration transmission is to be suppressed, and includes a vibration source side connection seat provided at a connection fixing position with the object side. A vibration source side connection member and a connection member extending from the object side to which vibration transmission is to be suppressed toward the vibration source side, and having an object side connection seat provided at a connection fixing position with the vibration source side One end of the fastening member for fastening the object side connecting member, the vibration source side connecting seat and the object side connecting seat overlapped at the connection fixing position, and the fastening portion of the fastening member as one end And a mass weight portion provided at the tip of the other end of the spring portion.

  Further, the dynamic damper according to the present invention has a fastening member for fastening the connecting member from the vibration source side and the connecting member from the object side to suppress the transmission of vibration, and a fastening portion of the fastening member as one end. A spring portion extending from one end to the other end and a mass weight portion provided at the tip of the other end of the spring portion are provided.

  In the dynamic damper according to the present invention, it is preferable that the spring portion is a shaft-shaped member and is a shaft-shaped spring portion having a hollow portion extending in the axial direction.

  In the dynamic damper according to the present invention, it is preferable that the shaft-like spring portion has a partial groove cut around the shaft and penetrating through the hollow portion.

  Moreover, in the dynamic damper according to the present invention, it is preferable that the shaft-like spring portion has a spiral groove that is spirally cut around the shaft as a partial groove.

  Further, in the dynamic damper according to the present invention, the fastening member is configured by a bolt part and a nut part that integrally fasten the connection member from the vibration source side and the connection member from the object side for which vibration transmission is to be suppressed. It is preferable.

  With at least one of the above-described configurations, the dynamic damper system includes a connection seat for a connection member extending from the vibration source side toward the object side, and a connection seat for the connection member extending from the object side toward the vibration source side. The spring part is extended from the fastening part of the fastening member, and a mass weight part is provided at the tip thereof. Thus, a dynamic damper including a spring portion and a mass weight portion can be configured at the position where the vibration source side and the object side are connected. Therefore, there is no need for a mounting member such as a bracket for mounting the dynamic damper, and there is no influence of vibration antinodes and nodes generated by using the mounting member at a relatively high frequency, so that the resonance of the dynamic damper is effective. Therefore, transmission of vibration having a relatively high frequency can be effectively suppressed.

  According to at least one of the above configurations, the dynamic damper includes a fastening member that fastens the connection member from the vibration source side and the connection member from the object side, a spring portion that extends from the fastening portion of the fastening member, and a spring portion. And a mass weight portion at the tip of the other end. This eliminates the need for a mounting member such as a bracket for mounting the dynamic damper and eliminates the effects of vibration antinodes and nodes generated by using the mounting member at a relatively high frequency. Can communicate effectively. Therefore, transmission of vibration having a relatively high frequency can be effectively suppressed.

  Further, in the dynamic damper, the spring portion is an axial spring portion having a hollow portion extending in the axial direction, so that it can be easily integrated with the fastening member. Further, in the dynamic damper, the shaft-like spring portion has a partial groove cut around the shaft and penetrating through the hollow portion, so that it is easy to arbitrarily change the spring constant by setting the size of the partial groove and the like. Further, in the dynamic damper, the shaft spring portion has a spiral groove that is engraved in a spiral shape around the shaft as a partial groove. It is easy to arbitrarily change the spring constant by setting the dimensions of the spiral groove. Further, in the dynamic damper, the fastening member is composed of a bolt part and a nut part, so that the structure of the dynamic damper can be simplified.

It is a figure explaining the structure of the dynamic damper system of embodiment which concerns on this invention. It is a partial expanded sectional view of FIG. It is a figure explaining the structure of the dynamic damper of FIG. It is a figure explaining the example of other composition of the dynamic damper system of an embodiment concerning the invention. It is a figure explaining one of the other structural examples of the dynamic damper of embodiment which concerns on this invention. It is a figure explaining one of the structural examples different from FIG. It is a figure explaining one of the structural examples different from FIG. It is a figure explaining one of the structural examples different from FIG. It is a figure explaining one of the structural examples different from FIG.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. Hereinafter, a dynamic damper system will be described in which an inverter mounted on a vehicle is used as a vibration source and transmission of the vibration to the vehicle body is suppressed. However, a dynamic damper system other than for a vehicle may be used, and the vibration source May be a vibrating body other than an inverter. Conversely, the vehicle body may be a vibration source, and another vehicle mounting member may be an object for which vibration transmission is to be suppressed.

  Also, in the following, as a method of mounting the inverter as a vibration source to the vehicle, a method using a mounting bracket attached to the inverter housing and a mounting bracket on the vehicle body side will be described. Even if this method is used, the present invention can be applied as long as it is an attachment method having a connection fixing position for connecting the vibration source side and the object side. In addition, the shape, dimensions, materials, and the like described below are exemplifications for explanation, and can be appropriately changed according to the content of vibration to be suppressed.

  Below, the same code | symbol is attached | subjected to the same element in all the drawings, and the overlapping description is abbreviate | omitted. In the description in the text, the symbols described before are used as necessary.

  FIG. 1 is a diagram illustrating the configuration of a vehicle dynamic damper system 10. This dynamic damper system 10 uses an inverter 8 mounted on a vehicle as a vibration source, and uses the vehicle body as an object for which transmission of the vibration is to be suppressed.

  The inverter 8 is an orthogonal transform circuit that performs conversion between DC power and AC power, and includes a capacitive element, a reactor element, a switching element, and the like, and operates at a switching frequency or the like. Since this switching frequency is a high frequency determined by the specifications of the inverter 8, when the inverter 8 is operated, a high-frequency ripple current flows through the capacitive element, reactor element, etc., and an excitation force is generated due to electrical and magnetic fluctuations. These elements and components vibrate. When this vibration vibrates the casing of the inverter 8 and propagates into the vehicle interior via the attachment portion to the vehicle, it becomes vibration and noise for the user. The dynamic damper system 10 is provided to suppress transmission of such vibration to the vehicle body.

  The dynamic damper system 10 includes a mounting bracket 12 extending from the side of the inverter 8 that is a vibration source, a mounting bracket 16 extending from the side of the vehicle body that is an object for which transmission of vibration is to be suppressed, and the two mounting brackets 12, The fastening member 40 includes a fastening member 40 that is superposed and fastened at 16 connection fixing positions 20, a spring portion 50 that extends from the fastening member 40, and a mass weight portion 60 that is attached to the tip of the spring portion 50.

  Here, the fastening member 40, the spring portion 50, and the mass weight portion 60 constitute the dynamic damper 30. As described above, the dynamic damper system 10 is characterized in that the fastening member used at the connection and fixing position between the vibration source side and the object side is provided with the function of the dynamic damper 30. That is, it is greatly different from the conventional dynamic damper system in that it does not require a bracket or the like as a member to which the dynamic damper 30 is attached.

  FIG. 2 is an enlarged cross-sectional view in the vicinity of the connection fixing position 20 in FIG. 1, and FIG. 3 is a diagram for explaining the configuration of the dynamic damper 30.

  As described above, the mounting bracket 12 is a bracket extending from the inverter 8 side, and corresponds to a vibration source side connecting member. The mounting bracket 12 is a metal plate whose one end is fixed to the casing of the inverter 8 and whose other end extends to the vehicle body side (not shown), that is, the vehicle body side.

  The connecting seat 14 provided on the mounting bracket 12 is a seat-like portion provided to clarify the connection fixing position 20 between the mounting bracket 16 and the screw portion 42 of the fastening member 40 at the center. A through hole is provided for passing through. The connection seat portion 14 is obtained by increasing the plate thickness on both sides in the plate thickness direction of a part of the mounting bracket 12. The thickened portion is a seat-like portion, but the size of the region is preferably substantially the same as the fastening area of the fastening member 40 that fastens both the mounting brackets 12 and 16 at the connection fixing position. .

  For example, when a bolt having a nominal head diameter of 10 mm and a nut having a nominal outer diameter of 10 mm are used as the fastening member 40, the connecting seat portion 14 is a circular portion having a diameter of 10 mm, and the thickness of the mounting bracket 12 at that portion is set. The thickness is about 1 mm larger than the thickness of the other portions, and the thickness is increased on both sides in the thickness direction. In addition, the dimension of said fastening member 40 and the dimension of the seat part 14 for a connection are examples.

  As described above, the mounting bracket 16 is a bracket extending from the side of the vehicle body (not shown) and corresponds to the object-side connection member. The mounting bracket 16 is a metal plate whose one end is fixed to a vehicle body (not shown) and whose other end extends to the inverter 8 side.

  The connecting seat 18 provided on the mounting bracket 16 is a seat-like portion provided to clarify the connection fixing position 20 between the mounting bracket 12 and the screw portion 42 of the fastening member 40 at the center. A through hole is provided for passing through. The dimensions and the like of the connection seat 18 are the same as those of the connection seat 14 of the mounting bracket 12.

  The dynamic damper 30 includes a fastening member 40, a spring portion 50, and a mass weight portion 60. The fastening member 40 includes a bolt portion and a nut 70. The bolt portion is integrated with the spring portion 50 and the mass weight portion 60, whereas a standard nut 70 can be used. Therefore, the nut 70 is omitted in FIG. That is, FIG. 3 is a diagram showing a dedicated portion of the dynamic damper 30 and can be said to be a dynamic damper in a narrow sense. In the following, unless otherwise specified, the explanation of a dynamic damper in a narrow sense excluding standard parts will proceed.

  The fastening member 40 of the dynamic damper 30 includes a screw part 42 of a bolt and a head part 44 thereof. The screw portion 42 is a shaft portion in which a male screw is engraved, and the male screw meshes with a female screw of a standard commercially available nut 70 so that the head 44 and the nut 70 can be fastened. As shown in FIG. 2, the head 44 has a function as a flange for overlapping the connection seat 14 of the mounting bracket 12 and the connection seat 18 of the mounting bracket 16 together with the nut 70. It is a part that has. That is, the head 44 is a portion corresponding to the fastening portion of the fastening member 40.

  The fastening member 40 and the nut 70 in FIG. 3 can fasten the mounting bracket 12 and the mounting bracket 16 at the connection fixing position 20 as follows. That is, the screw portion 42 of the fastening member 40 is sequentially passed through the through hole provided in the connection seat portion 18 of the mounting bracket 16 and the through hole provided also in the connection seat portion 14 of the mounting bracket 12. Then, the nut 70 is aligned with the screw portion 42 of the fastening member 40 and rotated in the fastening direction. By proceeding with the rotation, the connection seat 18 on the upper surface side of the mounting bracket 16 abuts on the lower side of the head 44 of the fastening member 40, and the connection seat 18 and the mounting bracket on the lower surface side of the mounting bracket 16 are attached. 12, the connection seat 14 on the upper surface side contacts, and the connection seat 14 on the lower surface side of the mounting bracket 12 contacts the upper surface side of the nut 70.

  Furthermore, by rotating the nut 70 with respect to the screw portion 42 of the fastening member 40, these are firmly fastened. In this state, the fastening member 40 that is an element of the dynamic damper 30 is attached from the mounting bracket 12 that is the vibration source side connection member from the inverter 8 that is the vibration source, and the vehicle body that is the object for which vibration transmission is to be suppressed. These two mounting brackets 12 and 16 can be overlapped and fastened at just the connection fixing position 20 with the mounting bracket 16 which is the object side connection member. In other words, the dynamic damper 30 is disposed just at the connection fixing position 20 where these two mounting brackets 12 and 16 are overlapped and fastened.

  As described above, the connection seats 14 and 18 are provided on the two mounting brackets 12 and 16, respectively, thereby limiting the vibration transmission path from the inverter 8 that is the vibration source, and the resonance of the dynamic damper 30 is caused here. Can act directly. From the results of experiments with various connection positions of the dynamic damper, it has been confirmed that the vibration reducing effect is most produced when the dynamic damper 30 is installed at the connection fixing position 20.

  The spring portion 50 of the dynamic damper 30 is an elastic member that extends from one end to the other end with the head 44 that is the fastening portion of the fastening member 40 as one end. Specifically, the spring portion 50 is an axial member 52 extending coaxially with the fastening member 40 on the upper portion of the head portion 44 of the fastening member 40, and includes a hollow portion 54 extending in the axial direction and the axial member 52. A spiral groove 56 is formed so as to penetrate the hollow portion 54 by being spirally wound around the periphery.

  The shaft-like member 52 is made of the same material as the fastening member 40 and is integral with the fastening member 40. That is, the fastening member 40 and the shaft-like member 52 are formed by processing the portion of the fastening member 40 in the lower portion from the same blank material and forming the portion of the shaft-like member 52 in the upper portion thereof. Each one is obtained. Therefore, when the dynamic damper 30 is disposed at the connection fixing position 20 of the two mounting brackets 12 and 16, the shaft constituting the spring portion 50 extends from the fastening member 40 in the axial direction at the connection fixing position 20. The shaped member 52 is arranged.

  The hollow portion 54 is a central gap provided along the axial direction at the center of the shaft-like member 52. That is, it is a bottomed hole in which the place of the head 44 of the fastening member 40 is the bottom along the central axis of the shaft-shaped member 52 and the tip of the shaft-shaped member 52 is the tip opening. The helical groove 56 is a helical partial groove that reaches the gap of the hollow portion 54 from the outer peripheral side of the shaft-like member 52. The meaning of the partial groove is that when the entire shaft-shaped member 52 is engraved, the shaft-shaped member 52 is divided into two members, so that the spiral groove 56 is engraved over the entire shaft-shaped member 52. That is not.

  Thus, the shaft-like member 52 in which the spiral groove 56 is partially engraved so that the groove bottom reaches the hollow portion 54 can be treated as having a function as a coil spring approximately. That is, as shown in FIG. 2, the thick part with the axial height h divided by the outer diameter D of the shaft-shaped member 52, the inner diameter d of the hollow portion 54, and the spiral groove 56 of the shaft-shaped member 52 is A predetermined spring constant can be obtained by appropriately setting these dimensions as corresponding to the cross-sectional shape. The spiral groove 56 preferably has two or more rounds. This is because the coil-corresponding portion makes one turn around the groove.

  In general, when a thick coil is to be wound with a coil spring, the inner diameter of the coil cannot be reduced so much due to restrictions of a jig or the like, and the entire size is increased. As described above, a hollow portion 54 is provided in the columnar shaft-shaped member 52, and a cylindrical shape with the hollow portion 54 as an inner diameter side allows a small inner diameter. A miniaturized coil spring is possible. By using the function as a coil spring in this manner, a spring portion corresponding to a thick coil spring can be configured as compared with a configuration suitable for low frequencies, as in the case of a conventional dynamic damper, so that a relatively high frequency can be handled. It can be a dynamic damper. For example, the vibration frequency of the inverter 8 can be set sufficiently from several kHz to 10 kHz or more.

  The mass weight part 60 is a weight fitted to the tip of the other end of the spring part 50. Specifically, a metal cylindrical member having a bottomed hole having an inner diameter that matches the outer diameter of the shaft-shaped member 52 of the spring portion 50 can be used as the mass weight portion 60. The other end of the spring portion 50 is fitted into the bottomed hole.

  In this manner, by providing the mass weight portion 60 at the tip of the spring portion 50, a mass-spring resonance system can be configured, and vibration transmitted from the connection fixing position 20 can be suppressed by the resonance. This is the function of the dynamic damper 30.

  In FIG. 1, the dynamic damper 30 is installed on the upper side of the connection fixing position 20, that is, on the upper side with respect to the direction of gravity. This may be installed on the lower side of the connection fixing position 20. The dynamic damper system 11 of FIG. 2 is a diagram illustrating an example in which a dynamic damper 31 is provided below the connection fixing position 20. The dynamic damper 31 is the same as the dynamic damper 30 described with reference to FIG. 1, but with the mounting direction turned upside down. Therefore, the function and effect described with reference to FIG.

  As the dynamic damper, a modification of the dynamic damper will be described below, which is integrated with the connection member at the connection fixing position 20.

  The dynamic damper 32 shown in FIG. 5 is obtained by extending the other end of the shaft-like member 58 and providing the function of the mass weight portion there. The contents of the other elements are the same as those described with reference to FIG. By doing so, the number of parts can be reduced and the cost can be reduced.

  The dynamic damper 33 in FIG. 6 uses a nut as a fastening member, and is provided with a spring portion and a mass weight portion at the other end of the nut. Here, a nut screw portion 46 and a head portion 44 integrated with the nut screw portion 46 are shown as the nut portion 41, and a spring portion and a mass weight portion extending to the other end are provided with the head portion 44 as one end. The configuration described in FIG. 5 is used for the spring portion and the mass weight portion. That is, the long shaft-shaped member 80, the hollow portion 84, and the spiral groove 86 constitute a spring portion and a mass weight portion.

  The dynamic damper 34 in FIG. 7 is an example in which a partial groove cut around the shaft and penetrating through the hollow portion is used as a spring portion instead of the spiral groove of the dynamic damper 30 described in FIG. Here, as the spring portion 90, a plurality of partial grooves 96 penetrating the hollow portion 54 are provided alternately around the shaft-like member 52. Therefore, the plurality of partial grooves 96 are not connected to each other. Each of the partial grooves 96 is a semicircular groove, and the length of the groove along the periphery of the shaft is 180 degrees or more, with the circumference of the shaft being 360 degrees, and is in a range of 200 degrees to 270 degrees. It is good. Thereby, the flexibility of the shaft-shaped member 52 which is a hollow cylinder can be ensured, and the function as the spring part 90 is exhibited.

  The dynamic damper 35 shown in FIG. 8 is not flexible by a spiral groove or a semicircular partial groove, but is made flexible by reducing the thickness of the hollow cylindrical portion and elastically deforming the thin portion. It is a figure which shows the example used as a certain spring part. Here, a screw shaft is used as the fastening member 100, and the head portion 102 is the bottom of the cylindrical member 104. As described above, the cylindrical member 104 has such a thin thickness that it can expand to the outer peripheral side and function as a spring part when it constitutes a resonance system with the mass weight part 106.

  The dynamic damper 36 in FIG. 9 is a diagram illustrating an example in which a spring portion is configured by a separate member from the fastening member. Here, as the fastening member 110, a standard commercially available bolt having a screw portion 112 and a head portion 114 is used. And the washer part 116 is arrange | positioned between the upper surface of the seat part 18 for a connection of the attachment bracket 16, and the lower surface of the head part 114 of the fastening member 110. FIG. This sandwiched position corresponds to the connection fixing position. The washer portion 116 includes a beam portion 118 extending to the other end side with the connection fixing position as one end, and a mass weight portion 120 provided at the tip of the other end of the beam portion 118. Here, although the mass weight part 120 is integrated with the beam part 118, it is good also as another member.

  The dynamic damper system and the dynamic damper according to the present invention can be used for suppressing vibration transmission in a vehicle, for example.

  10, 11 Dynamic damper system, 12, 16 Mounting bracket, 14, 18 Connection seat, 20 Connection fixing position, 30, 31, 32, 33, 34, 35, 36 Dynamic damper, 40, 100, 110 Fastening member, 41 Nut, 42, 112 Screw, 44, 102, 114 Head, 46 Nut, 50, 90 Spring, 52 Shaft, 54, 84 Hollow, 56, 86 Spiral, 58, 80 Shaft Member, 60, 106, 120 Mass weight part, 70 nut, 96 partial groove, 104 cylindrical member, 116 washer part, 118 beam part.

Claims (6)

A connection member extending from the vibration source side toward the object side where vibration transmission is desired to be suppressed, and a vibration source side connection member having a vibration source side connection seat provided at a connection fixing position with the object side;
A connection member extending from the object side to which vibration transmission is to be suppressed toward the vibration source side, the object side connection member having an object side connection seat provided at a connection fixing position with the vibration source side;
A fastening member for fastening the vibration source side connection seat and the object side connection seat overlapped at the connection fixing position;
A spring portion extending from one end to the other end, with the fastening portion of the fastening member as one end,
A mass weight portion provided at the tip of the other end of the spring portion;
A dynamic damper system characterized by comprising: A fastening member that fastens the connection member from the vibration source side and the connection member from the object side on which vibration transmission is to be suppressed;
A spring portion extending from one end to the other end, with the fastening portion of the fastening member as one end,
A mass weight portion provided at the tip of the other end of the spring portion;
Dynamic damper characterized by comprising. The dynamic damper according to claim 2,
The spring part
A dynamic damper which is a shaft-shaped member and is a shaft-shaped spring portion having a hollow portion extending in the axial direction. The dynamic damper according to claim 3,
The shaft spring is
A dynamic damper having a partial groove cut around a shaft and penetrating through a hollow portion. The dynamic damper according to claim 4,
The shaft spring is
A dynamic damper characterized by having a spiral groove carved into a spiral around the shaft as a partial groove. The dynamic damper according to claim 2,
The fastening member is
A dynamic damper comprising: a bolt part and a nut part for integrally fastening a connection member from a vibration source side and a connection member from an object side for which transmission of vibration is to be suppressed.

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