JP5924239B2 - Anti-vibration bush and electronic device - Google Patents

Description

The present invention relates to an anti-vibration bush and an electronic device , and more particularly to an anti-vibration bush suitable for an in-vehicle electronic device.

  2. Description of the Related Art Conventionally, a vibration isolating bush that is attached to a bracket of an electronic device and attenuates vibration transmitted from the mounted body to the electronic device in order to attenuate the vibration transmitted from the mounted body is known. Moreover, as such an anti-vibration bush, the thing of patent document 1 is known, for example.

  The anti-vibration bush described in Patent Document 1 includes an inner cylinder part (rigid inner cylinder) and a central through hole, and includes an outer cylinder part made of rubber (anti-vibration rubber) fixed to the inner cylinder part. And a pair of pushing members disposed with a central through hole therebetween.

JP 2012-92854 A

  In the anti-vibration bush described in Patent Literature 1, the pair of pushing members have tapered surfaces that face each other. And the taper surface of the pushing member is pushed into the central through hole by tightening a bolt arranged so as to penetrate both the pushing members and the inner cylinder portion, and the outer cylinder portion is expanded in diameter. As a result, the outer cylinder portion is brought into close contact with the inner peripheral surface of the go bracket and is attached to the bracket.

  As described above, according to Patent Document 1, the vibration isolating bush can be firmly attached to the bracket without using an adhesive. However, since a pair of pushing members is required, there is a problem that the number of parts increases.

  In addition, if the outer cylinder part cracks in the axial direction of the inner cylinder part due to deterioration of the rubber constituting the outer cylinder part or application of external force, the outer cylinder part between the inner cylinder part and the surrounding bracket There is a risk that at least a part of it falls out. That is, the vibration damping function cannot be exhibited stably over a long period.

In view of the above problems, an object of the present invention is to provide an anti-vibration bush and an electronic device that can be brought into close contact with a bracket while reducing the number of components and that can stably exhibit a vibration damping function over a long period of time. .

In order to achieve the above object, the present invention provides an electronic device bracket (30) for attenuating vibration transmitted from an attached body to the electronic device (10) fixed to the attached body (80) by screws. Anti-vibration bush attached to
An inner cylinder part (42) formed of metal and having a through hole (44) into which a pillar part (32a) of the screw (32) is inserted;
An outer cylinder part (46) formed using rubber and fixed to the outer surface of the inner cylinder part;
A washer portion (52) fixed to one surface (46a) facing the screw head (32b) in the outer cylinder portion,
The outer cylinder part is provided along the circumferential direction on the outer surface, and has a groove part (50) into which the bracket is inserted and arranged.
The washer portion is provided in the entire region overlapping with the screw head on one surface of the outer cylinder portion in the orthogonal direction orthogonal to the axial direction of the inner cylinder portion with the screw disposed in the through hole. It is provided to overlap with
By tightening the screw, in the axial direction, the outer cylinder portion is compressed between the head portion of the screw and the mounted body via the washer portion, and the bottom wall surface (50a) and the side wall surfaces (50b, 50c) of the groove portion The side wall surface is in close contact with both surfaces (30a, 30b) of the bracket ,
The groove is provided on the entire circumference in the circumferential direction,
In one of the orthogonal directions, the same bracket is disposed on both sides of the outer cylinder part ,
The bracket has a hole (34),
The outer cylinder part is in close contact with the peripheral edge of the hole of the bracket on the entire circumference in the circumferential direction,
The outer cylinder is
A first cylinder having a thick part (62) provided on the screw head side in the axial direction and a thin part (64) provided on the mounted body side is fixed to the inner cylinder part in a cylindrical shape. A member (60);
A second member (66) attached to the thin portion so as to face only a part of the thin portion from the end on the attached body side in the axial direction in the axial direction;
The washer is fixed to the thick part of the first member,
The first member has a first convex portion (70) on the outer surface of the thin wall portion, the second member has a second convex portion (72) on the inner surface, and the second convex portion is the first convex portion in the axial direction. The second member is mounted on the first member in a state of being over the part and being closer to the washer part than the first convex part,
Of the outer surface of the thin portion, the portion not facing the second member forms the bottom wall surface of the groove portion, and the end surface on the thin portion side of the thick portion and the end surface on the thick portion side of the second member form the sidewall surface of the groove portion. ,
Of the first member and the second member, only the first member is disposed in the hole of the bracket, and the second member is attached to the first member outside the body to be taken with respect to the hole. To do.

  According to this, the outer cylinder part (46) has the groove part (50) in the outer surface, and a bracket (30) is arrange | positioned at a groove part (50). Further, in the outer tube portion (46), the washer portion (52) is fixed to the surface (46a) of the screw (32) facing the head portion (32b). Thus, when the electronic device (10) is screwed to the attached body (80), the outer cylinder part (46) is connected to the head part (32b) and the attached body (80) via the washer part (52). The side wall surfaces (50b, 50c) of the groove (50) are brought into close contact with both surfaces (30a, 30b) of the bracket. Therefore, the anti-vibration bush (40) can be brought into close contact with the bracket without using a pair of pushing members as in the prior art.

  In addition, the washer portion (52) is provided over the entire region overlapping the head portion (32b) of the screw (32) on one surface (46a) of the outer tube portion (46) in the orthogonal direction, and the bracket (30). And are provided to overlap. Therefore, a portion of the outer tube portion (46) located between the inner tube portion (42) and the bracket (30) in the orthogonal direction is connected to the head of the screw (32) via the washer portion (52). 32b) and the mounted body (80) are held in a compressed state. As a result, even if a crack occurs in the outer cylinder part (46) in the axial direction due to deterioration of the rubber or application of external force, at least a part of the part contributing to vibration damping in the outer cylinder part (46) falls off. Can be suppressed. Therefore, the vibration damping function can be more stably exhibited over a longer period than before.

It is a top view which shows schematic structure of the electronic device which concerns on 1st Embodiment. It is a side view which shows an electronic device. For convenience, the attached body is not shown. It is sectional drawing which follows the III-III line | wire of FIG. 1, and has shown the attachment structure of the electronic device. It is sectional drawing which shows schematic structure of a vibration proof bush, and has shown the state before the fastening of a screw. It is sectional drawing which shows the arrangement | positioning process which has arrange | positioned the anti-vibration bush to the bracket. It is sectional drawing which shows schematic structure of the anti-vibration bush which concerns on 2nd Embodiment. It is sectional drawing which shows the attachment structure of the electronic device using the anti-vibration bush shown in FIG. It is sectional drawing which shows the attachment structure of the electronic device using the vibration proof bush which concerns on 3rd Embodiment. It is sectional drawing which shows the attachment structure of the electronic device using the vibration proof bush which concerns on 4th Embodiment. It is sectional drawing which shows a 1st member among the outer cylinder parts which comprise the vibration proof bush shown in FIG. It is sectional drawing which shows a 2nd member among the outer cylinder parts which comprise the anti-vibration bush shown in FIG. It is sectional drawing which shows the assembly | attachment process of assembling the 1st member and the 2nd member. It is a top view which shows a 1st modification. It is a top view which shows the 2nd modification. It is sectional drawing which follows the XV-XV line | wire of FIG. It is sectional drawing which shows a 3rd modification. It is sectional drawing which shows the attachment structure of the electronic device using the anti-vibration bush shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, common or related elements are given the same reference numerals. Further, the axial direction of the inner cylinder portion is simply referred to as an axial direction, and the direction orthogonal to the axial direction is referred to as an orthogonal direction.

(First embodiment)
First, the structure of an electronic device using the vibration-proof bushing according to the present embodiment will be described with reference to FIGS. 1 and 2.

  An electronic device 10 shown in FIGS. 1 and 2 is configured as an electronic control unit (ECU) that controls a vehicle engine.

  The electronic device 10 has a housing 12. In this embodiment, the housing 12 includes two members, an upper case 14 and a lower case 16, and the housing 12 is formed by assembling the upper case 14 and the lower case 16 with screws 18. A circuit board (not shown) is accommodated in the internal space of the housing 12. A connector 20 is mounted on the circuit board, and a part of the connector 20 is exposed to the outside from the housing 12. A wire harness 24 is electrically connected to the connector 20 via an external connector 22 on the vehicle side.

  The upper case 14 has a box shape with one surface open, and a breathing filter 26 is attached to the bottom thereof. On the other hand, the lower case 16 has a shallow box shape whose one surface is open. The upper case 14 and the lower case 16 have flanges at the periphery of the opening, and are assembled by screws 18 with the flanges facing each other. In addition, the electronic device 10 has a bracket 30 for mounting on the mounted body 80. As shown in FIG. 1, the flange 16 a of the lower case 16 extends outward from the flange of the upper case 14, and a bracket 30 is fixed to the extended portion by screws 28.

  The bracket 30 is disposed on an engine block that is the mounted body 80 and is fixed by fastening screws 32. As described above, the electronic device 10 is fixed to the attachment body 80 by the screw 32. Further, the vibration isolating bush 40 is attached to the bracket 30 in order to attenuate the vibration transmitted from the attached body 80 to the electronic device 10.

  Next, the structure of the anti-vibration bush 40, the attachment structure of the anti-vibration bush 40, and the attachment structure of the electronic device 10 will be described with reference to FIGS.

  As shown in FIGS. 3 and 4, the anti-vibration bush 40 has two cylindrical members, an inner cylinder part 42 and an outer cylinder part 46, as main parts. The inner cylinder part 42 is formed using a metal and is also called a metal collar. The inner cylinder portion 42 has a through hole 44 into which the column portion 32a of the screw 32 is inserted. In the present embodiment, the cross section perpendicular to the axial direction of the through hole 44 is circular.

  On the other hand, the outer cylinder portion 46 is formed using rubber and is bonded and fixed to the outer surface of the inner cylinder portion 42. The outer cylinder portion 46 also has a through hole 48 extending in the axial direction, and it can be said that the inner cylinder portion 42 is accommodated in the through hole 48.

  Further, in the present embodiment, the lengths of the inner cylindrical portion 42 and the outer cylindrical portion 46 are substantially equal in the axial direction in a state before the fastening of the screw 32 shown in FIG. 4 (hereinafter referred to as a state before the fastening). ing. Further, even in the tightened state (hereinafter, referred to as a tightened state) of the screw 32 shown in FIG. 3, the inner cylindrical portion 42 and the outer cylindrical portion 46 have substantially the same length in the axial direction. In other words, it can be said that the tightening amount of the screw 32 is defined by the length of the inner cylindrical portion 42.

  A groove portion 50 is provided on the outer surface of the outer tube portion 46 along the circumferential direction. As shown in FIG. 4, the bracket 30 is inserted into the groove 50. In the present embodiment, as shown in FIGS. 3 and 4, the groove portion 50 is provided in the central portion of the outer cylinder portion 46 in the axial direction. In the outer cylinder portion 46 having a substantially U-shaped cross section, the axial lengths of both end portions sandwiching the groove portion 50 are substantially equal to each other. In the present embodiment, the bracket 30 has a hole 34 (through hole) for attaching a vibration isolating bush. The outer cylinder portion 46 has a groove portion 50 on the entire circumference in the circumferential direction corresponding to the hole portion 34. Therefore, the vibration isolating bush 40 is disposed in the hole 34 of the bracket 30 and the hole periphery of the bracket 30 is disposed in the groove 50 on the entire circumference.

  The groove 50 has a bottom wall surface 50a and side wall surfaces 50b and 50c. The side wall surface 50b is opposed to the peripheral portion of the hole of the one surface 30a out of both surfaces 30a and 30b orthogonal to the axial direction of the bracket 30. Moreover, the side wall surface 50c opposes the hole peripheral part of the back surface 30b. The bottom wall surface 50 a faces the end surface 30 c of the bracket 30 that constitutes the inner wall of the hole 34.

  In the present embodiment, the width W1 of the groove portion 50 in the axial direction is shorter than the thickness T1 of the bracket 30 in a state before fastening. In addition, in FIG. 4, the bracket 30 is shown with the broken line for reference. In the fastened state, the side wall surface 50b is in close contact with the one surface 30a and the side wall surface 50c is in close contact with the back surface 30b due to the axial deformation of the outer cylinder portion 46. That is, the bracket 30 is sandwiched between the outer cylindrical portions 46 in the axial direction.

  Here, in the state before fastening, the maximum value of the outer diameter of the bottom wall surface 50a of the outer cylindrical portion 46 is set to D1. On the other hand, as shown in FIG. 3, the diameter of the hole 34 of the bracket 30 is D2. Then, in this embodiment, the maximum value D1 of the outer diameter of the bottom wall surface 50a is smaller than the diameter D2 of the hole 34 in the state before fastening. Even in the fastened state, the maximum value D1 of the outer diameter of the bottom wall surface 50a is smaller than the diameter D2 of the hole 34. For this reason, the bottom wall surface 50a is not in contact with the end surface 30c in any state before and after the screw 32 is fastened.

  Further, in the outer cylinder portion 46, the surface roughness of the portion that contacts the bracket 30 is smaller than the surface roughness of the portion that does not contact the bracket 30. Specifically, the surface roughness of the side wall surfaces 50 b and 50 c is smaller than the surface roughness of the outer surface other than the bottom wall surface 50 a and the wall surface of the groove portion 50.

  Further, in the present embodiment, the vibration isolating bush 40 has a washer portion 52. The washer portion 52 is fixed to one surface 46 a that faces the head portion 32 b of the screw 32, among the one surface 46 a and the back surface 46 b that are end surfaces of the outer cylinder portion 46. Further, the washer portion 52 is provided in the entire region overlapping the head portion 32b of the screw 32 on the one surface 46a in the orthogonal direction, and is provided so as to necessarily overlap the bracket 30 disposed in the groove portion 50. . The washer portion 52 is provided so as to necessarily overlap the bracket 30 as long as it is within a tolerance range of the mounting position of the bracket 30 with respect to the groove portion 50.

  In the present embodiment, the washer portion 52 is bonded and fixed to the one surface 46 a of the outer tube portion 46. Further, the washer portion 52 has an annular shape, and the inner periphery thereof substantially coincides with the inner peripheral surface of the inner cylinder portion 42 and the outer periphery thereof is substantially the same as the outer peripheral end of the one surface 46a of the outer cylinder portion 46 before being fastened. Match. That is, the washer portion 52 is disposed on the entire one end surface of the inner tube portion 42 and the entire one surface 46 a of the outer tube portion 46. The washer portion 52 is also bonded and fixed to one end surface of the inner cylinder portion 42. Such a washer part 52 can also be integrally formed using the same material as the inner cylinder part 42.

  Thus, since the vibration isolating bush 40 has the washer portion 52, the head portion 32b of the screw 32 contacts the washer portion 52 in the fastened state. The outer cylinder portion 46 is disposed on the mounted body 80 with the back surface 46b as a contact surface, and is compressed and deformed between the head portion 32b and the mounted body 80 via the washer portion 52. As a result, the outer cylinder portion 46 is in close contact with the bracket 30 and attached to the bracket 30. 3 is a screw hole for the screw 32 provided in the mounted body 80.

  Next, the mounting method of the above-described vibration-proof bushing 40, in other words, the mounting method of the electronic device 10 will be described with reference to FIGS.

  First, an anti-vibration bush 40 shown in FIG. 4 is prepared. In this preparation step, as described above, the vibration isolating bush 40 having the inner cylinder part 42, the outer cylinder part 46, and the washer part 52 is prepared. In addition, the electronic device 10 in which the bracket 30 is fixed to the housing 12 is prepared.

  Next, as shown in FIG. 5, the bracket 30 is inserted into the groove portion 50 of the prepared vibration isolating bush 40. In other words, in this arrangement step, the vibration isolating bush 40 is fitted into the hole 34 of the bracket 30 while elastically deforming the outer cylinder portion 46. In the present embodiment, the width W <b> 1 of the groove portion 50 in the axial direction is shorter than the thickness T <b> 1 of the bracket 30 before the fastening. Accordingly, when the vibration isolating bush 40 is attached to the bracket 30, the outer cylinder portion 46 is pushed in the axial direction by the bracket 30, and the outer cylinder portion 46 is deformed in the axial direction. The axial length of the outer cylindrical portion 46 is longer than the axial length of the inner cylindrical portion 42, and the outer cylindrical portion 46 is in a state of protruding in the axial direction with respect to the inner cylindrical portion 42. In this embodiment, the outer cylinder part 46 becomes 2 mm long in the axial direction.

  Next, the screw 32 is fastened to fix the electronic device 10 to the mounted body 80. In this fastening step, the pillar portion 32a is inserted into the through hole 44 of the inner cylinder portion 42 and the through hole 48 of the outer cylinder portion 46, and the head portion 32b is in contact with the washer portion 52 with respect to the vibration isolating bush 40. The screw 32 is disposed. And it positions so that the front-end | tip of the column part 32a which protrudes in the back surface 46b side of the outer cylinder part 46 may be inserted in the screw hole 82 of the to-be-attached body 80. FIG. In this positioning state, the screw 32 is tightened. Along with this tightening, the washer portion 52 is also displaced toward the attached body 80 together with the head portion 32 b, and the outer tube portion 46 is compressed and deformed between the washer portion 52 and the attached body 80. The axial length of the outer cylindrical portion 46 is substantially equal to the length of the inner cylindrical portion 42, that is, the distance between the head portion 32 b and the mounted body 80 is the length of the inner cylindrical portion 42 and the thickness of the washer portion 52. When it becomes almost equal to the sum, tightening is completed. That is, the outer cylinder portion 46 is compressed by 2 mm extended by attachment to the bracket 30. Specifically, the portion located on one surface 30a of the bracket 30 and the portion located on the back surface 30b are mainly compressed. In the state where the fastening of the screw 32 is completed, as shown in FIG. 3, the side wall surface 50b is in close contact with the one surface 30a, and the side wall surface 50c is in close contact with the back surface 30b. That is, in the axial direction, the bracket 30 is sandwiched by the outer tube portion 46 having a substantially U-shaped cross section. In this manner, the vibration isolating bush 40 can be attached to the bracket 30 and the electronic device 10 can be fixed to the attached body 80.

  The anti-vibration bush 40 integrated with the bracket 30 may be disposed on the mounted body 80 so that the through hole 44 overlaps the screw hole 82, and then the screw 32 may be inserted through the through hole 44. .

  Next, the effect of the characteristic part of this embodiment is demonstrated.

  In the present embodiment, the groove portion 50 is provided on the outer surface of the outer cylinder portion 46, and the bracket 30 is inserted and disposed in the groove portion 50. A washer portion 52 is provided on one surface 46 a of the outer cylinder portion 46. Therefore, when the electronic device 10 is screwed to the attached body 80, the outer cylindrical portion 46 is compressed and deformed in the axial direction between the head 32 b of the screw 32 and the attached body 80 via the washer portion 52. Can be made. And by this compressive deformation, the side wall surfaces 50b and 50c of the groove part 50 can be closely_contact | adhered to both the surfaces 30a and 30b of the bracket 30. FIG. Therefore, the electronic device 10 can be fixed to the mounted body 80 and the vibration isolating bush 40 can be closely attached to the bracket 30 in the same process without using a pair of pushing members as in the prior art.

  Further, the washer portion 52 is provided over the entire region overlapping with the head portion 32 b of the screw 32 on the one surface 46 a of the outer cylinder portion 46 in the orthogonal direction, and is provided so as to overlap the bracket 30. Therefore, a portion of the outer cylinder portion 46 located between the inner cylinder portion 42 and the bracket 30 in the orthogonal direction is compressed between the head portion 32b of the screw 32 and the mounted body 80 via the washer portion 52. Held in a state. Thereby, even if a crack occurs in the outer cylindrical portion 46 in the axial direction due to rubber deterioration or application of external force, at least a part of the portion contributing to vibration damping in the outer cylindrical portion 46 is prevented from falling off. it can. Therefore, the vibration damping function can be more stably exhibited over a longer period than before.

  In addition, since the width W1 of the groove part 50 is shorter than the thickness T1 of the bracket 30, even when the vibration isolating bush 40 is attached to the bracket 30, the outer cylinder part 46 is deformed not a little in the axial direction. However, in the present embodiment, the side walls 50 b and 50 c of the groove portion 50 are brought into close contact with both surfaces 30 a and 30 b of the bracket 30 by further using the fastening of the screw 32. Therefore, if the holding force of the outer cylinder part 46 with respect to the bracket 30 is made the same, the holding force of the outer cylinder part 46 itself can be reduced by the amount of fastening of the screw 32. In this case, it becomes easy to attach the vibration isolating bush 40 to the bracket 30. On the other hand, if the holding force of the outer cylinder part 46 itself is the same, the holding force of the outer cylinder part 46 with respect to the bracket 30 can be increased by the fastening of the screw 32. In this case, as shown in FIG. 3, even if the end surface 30 c of the bracket 30 is not in contact with the bottom wall surface 50 a of the groove 50, the bracket 30 is removed due to a phase shift due to the vibration in the orthogonal direction of the mounted body 80. Slight sliding with respect to the cylindrical portion 46 can be suppressed. Further, the vibration isolating bush 40 can be firmly fixed to the bracket 30 without using an adhesive.

  Further, in the axial direction, the outer cylinder portion 46 is held from both ends by the head portion 32 b of the screw 32 and the mounted body 80 via the washer portion 52. As described above, since the groove portion 50 of the outer cylindrical portion 46 is not expanded, the head portion 32b and the mounted body 80 are pressed, so that the vibration isolating bush 40 can be firmly fixed to the bracket 30 also by this. it can. In particular, since T1> W1, the groove 50 is easy to open, but this opening can be suppressed.

  Further, the outer cylinder portion 46 has a substantially U-shaped cross section, has a long facing distance to the bracket 30, and the facing directions are a combination of a plurality of directions. Therefore, even if a crack or the like occurs in the outer cylindrical portion 46, it is possible to suppress the electronic device 10 from falling off together with the vibration isolating bush 40.

  Moreover, the hole part 34 is provided in the bracket 30, and the outer cylinder part 46 is closely_contact | adhered to the hole peripheral part of the bracket 30 in the circumferential direction perimeter. Accordingly, in the fastening state of the screw 32, it is difficult to cause a positional deviation between the vibration isolating bush 40 and the bracket 30. In addition, it is possible to prevent the vibration isolating bush 40 from falling out of the bracket 30, in other words, the electronic device 10 including the bracket 30 from falling out of the vibration isolating bush 40.

  Further, in the outer cylinder portion 46, the surface roughness of the portion that contacts the bracket 30 is smaller than the surface roughness of the portion that does not contact the bracket 30. Therefore, even if the above-described slight sliding of the bracket 30 occurs, the wear of the outer cylinder portion 46 can be suppressed. For this reason, the anti-vibration bush 40 can ensure desired vibration damping properties over a long period of time. However, the surface roughness of the portion that contacts the bracket 30 may be the same as the surface roughness of the portion that does not contact the bracket 30.

(Second Embodiment)
In the present embodiment, the description of the anti-vibration bush 40, the attachment method of the anti-vibration bush 40 (the attachment method of the electronic device 10), and the parts common to the electronic device 10 including the anti-vibration bush 40 described in the above embodiment will be given. Omit.

  In the present embodiment, the maximum value D1 of the outer diameter of the bottom wall surface 50a of the outer cylindrical portion 46 shown in FIG. 6 is larger than the diameter D2 of the hole portion 34 of the bracket 30 shown in FIG. ing. Other points are the same as in the first embodiment.

  The anti-vibration bushing 40 having the outer cylinder part 46 is also attached to the peripheral edge of the hole of the bracket 30 while elastically deforming the outer cylinder part 46 as in the first embodiment. As described above, since the maximum value D1> the diameter D2, the portion of the outer cylindrical portion 46 facing the inner peripheral surface of the bracket 30 is compressed in the orthogonal direction. In a state where the vibration isolating bush 40 is attached to the bracket 30, the bottom wall surface 50 a is in close contact with the end surface 30 c of the bracket 30. Therefore, the maximum value D1 of the outer diameter of the bottom wall surface 50a of the outer cylindrical portion 46 is substantially equal to the diameter D2 of the hole 34. Furthermore, by fastening the screw 32, the outer cylindrical portion 46 is compressed and deformed in the axial direction, and attempts to increase the diameter in the orthogonal direction. That is, the bracket 30 is in close contact with the end surface 30c.

  As described above, in the fastening state shown in FIG. 7, that is, in a state where the electronic device 10 is fixed to the mounted body 80, the thin portion corresponding to the bottom wall surface 50a of the outer cylindrical portion 46 is compressed and deformed in the orthogonal direction. The wall surface 50a is in close contact with the end surface 30c of the bracket 30 on the entire circumference. Therefore, in the present embodiment, the vibration isolating bush 40 is in close contact with the both surfaces 30a and 30b and the end surface 30c of the bracket 30 on the entire circumference. Thereby, compared with the structure shown in 1st Embodiment, the fine sliding of the bracket 30 in an orthogonal direction can be suppressed more effectively.

(Third embodiment)
In the present embodiment, the description of the anti-vibration bush 40, the attachment method of the anti-vibration bush 40 (the attachment method of the electronic device 10), and the parts common to the electronic device 10 including the anti-vibration bush 40 described in the above embodiment will be given. Omit.

  The feature of this embodiment is that the groove portion 50 is provided with projections 54, 56a, and 56b. Other points are the same as in the second embodiment.

  As shown in FIG. 8, the outer cylinder part 46 has the 1st projection part 54 which protrudes with respect to the other part of this bottom wall surface 50a as a part of bottom wall surface 50a of the groove part 50. As shown in FIG. The first protrusion 54 is provided so as to be in contact with the central portion 30ca of the end surface 30c of the bracket 30 excluding a portion within a predetermined range from both ends in the axial direction on the entire circumference. The outer diameter of the bottom wall surface 50a of the outer cylindrical portion 46 is maximum at the tip surface of the first protrusion 54, and the maximum value D1 is the diameter of the hole 34 of the bracket 30 as in the second embodiment. It is larger than D2. Therefore, the first protrusion 54 is in close contact with the end face 30 c of the bracket 30 in a state before fastening, that is, in a state where the vibration isolating bush 40 is attached to the bracket 30.

  Moreover, it has 2nd projection part 56a, 56b which protrudes with respect to the other part of this side wall surface 50b, 50c as a part of side wall surface 50b, 50c. The second projecting portion 56a protrudes from the side wall surface 50b, and is provided so as to be in contact with the entire circumference of the one surface 30a of the bracket 30 excluding a portion within a predetermined range from the inner peripheral end in at least a fastening state. ing. Moreover, the 2nd protrusion part 56b protrudes from the side wall surface 50c, and contacts the part except the part of the predetermined range from the inner peripheral end among the back surfaces 30b of the bracket 30 at least in the fastening state. Is provided. And the outer cylinder part 46 has the recessed part 58 which connects the 1st projection part 54 and 2nd projection part 56a, 56b in the part corresponding to the edge 30d of the bracket 30. As shown in FIG.

  In this embodiment, since the width W1 of the groove 50 is shorter than the thickness T1 of the bracket 30 as in the above-described embodiment, the first protrusion 54 is in the axial direction with the vibration isolating bush 40 attached to the bracket 30. And is in close contact with the end face 30 c of the bracket 30. The second protrusions 56a and 56b are also compressed and deformed in the axial direction, and are in close contact with both surfaces 30a and 30b of the bracket 30. On the other hand, the outer cylinder portion 46 is separated from the edge 30 d of the bracket 30. In other words, the concave portion 58 is a gap. Further, by tightening the screw 32, the outer tube portion 46 is compressed and deformed between the head portion 32 b of the screw 32 and the mounted body 80 via the washer portion 52. Specifically, the portion located on one surface 30a of the bracket 30 and the portion located on the back surface 30b are mainly compressed. Even in this fastened state, the outer cylindrical portion 46 is separated from the edge 30 d of the bracket 30.

  According to the present embodiment, the outer cylinder portion 46 can be brought into close contact with the three surfaces 30a, 30b, and 30c of the bracket 30 while avoiding the edge 30d of the bracket 30 where stress is easily concentrated. Therefore, the durability of the outer cylinder part 46 can be improved as compared with the configuration in which the outer cylinder part 46 is also in close contact with the edge 30d. Moreover, since the outer cylinder part 46 is easily deformed as compared with the configuration in which the outer cylinder part 46 is also in close contact with the edge 30d, vibration damping can be improved. In addition, since the outer cylinder part 46 is closely_contact | adhered to 3 surfaces 30a, 30b, 30c of the bracket 30 like 2nd Embodiment, the fine sliding of the bracket 30 in an orthogonal direction can be suppressed effectively.

(Fourth embodiment)
In the present embodiment, the description of the anti-vibration bush 40, the attachment method of the anti-vibration bush 40 (the attachment method of the electronic device 10), and the parts common to the electronic device 10 including the anti-vibration bush 40 described in the above embodiment will be given. Omit.

  In the present embodiment, as shown in FIG. 9, the outer cylindrical portion 46 is composed of two cylindrical members, a first member 60 and a second member 66. As shown in FIGS. 9 and 10, the first member 60 has the above-described through hole 48 and is fixed to the outer surface of the inner cylinder portion 42. Moreover, it has the thick part 62 provided in the head 32b side of the screw 32 in the axial direction, and the thin part 64 provided in the to-be-attached body 80 side. In addition, in FIG. 10, the inner cylinder part 42 and the washer part 52 are also shown in figure.

  On the other hand, as shown in FIGS. 9 and 11, the second member 66 has a through hole 68, and faces only a part from the end of the thin portion 64 on the attached body 80 side in the axial direction. Thus, it is attached to the outer surface of the thin portion 64.

  Further, the first member 60 has a first convex portion 70 on the outer surface of the thin portion 64. On the other hand, the 2nd member 66 has the 2nd convex part 72 in the inner surface. The first member 70 and the second member 72 are protrusions for mounting the second member 66 on the first member 60. In this embodiment, it is formed on the entire circumference in the circumferential direction. Then, the first member 60 and the second member 66 are relatively moved in the axial direction in a state where the thin portion 64 of the first member 60 is disposed in the through hole 68 of the second member 66. Then, in the axial direction, the second projecting portion 72 rides over the first projecting portion 70, is positioned closer to the washer portion 52 than the first projecting portion 70, and the second member 66 is attached to the first member 60. It has become.

  Further, in a state where the second member 66 is mounted on the first member 60, a portion of the outer surface of the thin portion 64 that does not face the second member 66 forms the bottom wall surface 50 a of the groove portion 50, and the thin portion in the thick portion 62. The end surface on the 64 side and the end surface on the thick portion 62 side of the second member 66 form side wall surfaces 50b and 50c. Other points are the same as in the third embodiment.

  That is, in the thick portion 62 of the first member 60, the surface on the head portion 32 b side in the axial direction forms one surface 46 a of the outer cylinder portion 46. And the washer part 52 is being fixed to the one surface 46a. Moreover, the 1st projection part 54 is formed in the part which does not oppose the 2nd member 66 among the outer surfaces of the thin part 64, and makes the bottom wall surface 50a. Further, in the thick portion 62, a second protrusion 56a is formed on the end surface on the thin portion 64 side forming the side wall portion 50b. Further, in the second member 66, a second protrusion 56b is formed on the end surface on the thick portion 62 side forming the side wall portion 50c. Furthermore, the width W1 of the groove 50 is shorter than the thickness T1 of the bracket 30, and the maximum outer diameter D1 of the bottom wall surface 50a of the outer cylinder 46 is larger than the diameter D2 of the hole 34 of the bracket 30. It has become.

  Such an anti-vibration bushing 40 can be attached to the bracket 30 after the first member 60 and the second member 66 are assembled to form the outer cylinder portion 46 and thus the anti-vibration bushing 40. That is, the same attachment method as that in the third embodiment (that is, the first embodiment) can be employed. However, it is preferable to employ the mounting method described below.

  First, the first member 60 and the second member 66 fixed to the inner cylinder portion 42 are prepared. In this embodiment, the 1st member 60 with which the washer part 52 was fixed to the one surface 46a is prepared. In addition, the electronic device 10 in which the bracket 30 is fixed to the housing 12 is prepared.

  Next, the first member 60 and the second member 66 are assembled so that the bracket 30 is positioned in the groove 50. In this assembly process, the first member 60 and the second member 66 are assembled so that the hole periphery of the bracket 30 is positioned in the groove 50. Specifically, as shown in FIG. 12, the bracket 30 is arranged on the first member 60 so that the end surface 30c is in close contact with the first protrusion 54 and the one surface 30a is in contact with the second protrusion 56a. Then, the first member 60 and the second member 66 are moved so that the second member 66 approaches the washer portion 52 in a state where the thin portion 64 of the first member 60 is disposed in the through hole 68 of the second member 66. Move relative to the axial direction.

  In this embodiment, since the thickness T1 of the bracket 30> the width W1 of the groove portion 50, an external force is applied so that the second convex portion 72 is positioned closer to the washer portion 52 than the first convex portion 70. However, when the external force is removed, the second convex portion 72 returns to a position farther from the washer portion 52 than the first convex portion 70 due to the reaction force of the rubber. That is, when the assembly process is completed, the first member 60 and the second member 66 are temporarily attached. Therefore, although the first protrusion 54 is compressed and deformed in the orthogonal direction, the second protrusions 56a and 56b are not compressed and deformed in the axial direction and are in contact with the surfaces 30a and 30b of the bracket 30. .

  Next, the electronic device 10 is fixed to the mounted body 80 with the screws 32. This fastening process is the same as the fastening process shown in the first embodiment. Specifically, the screw 32 is fastened to fix the electronic device 10 to the mounted body 80. Also in this fastening process, by fastening the screw 32, the washer portion 52 is displaced to the attached body 80 side together with the head portion 32b, and the outer tubular portion 46 is compressed and deformed between the washer portion 52 and the attached body 80. Specifically, in the axial direction, the second protrusions 56a and 56b of the first member 60 are mainly compressed. In this embodiment, each is compressed by 1 mm in the axial direction. As a result, the second convex portion 72 gets over the first convex portion 70, becomes closer to the washer portion 52 than the first convex portion 70, and the second member 66 is attached to the first member 60. That is, the outer cylinder part 46 is formed. Further, in the axial direction, the length of the outer cylinder portion 46 is substantially equal to the length of the inner cylinder portion 42. In other words, the distance between the head portion 32b and the mounted body 80 becomes substantially equal to the sum of the length of the inner cylinder portion 42 and the thickness of the washer portion 52, and the tightening is completed.

  In the state where the fastening of the screw 32 is completed, as shown in FIG. 9, the first protrusion 54 is in close contact with the end surface 50c, the second protrusion 56a is in close contact with the one surface 30a, and the second protrusion 56b is in contact with the back surface 30b. It will be in close contact. Thus, according to the above attachment method, it is possible to attach without increasing the number of steps while adopting the outer cylinder portion 46 composed of the two members 60 and 66.

  As described above, according to the present embodiment, the first member 60 and the second member 66 are relatively moved in the axial direction in a state where the thin portion 64 of the first member 60 is disposed in the through hole 68 of the second member 66. By moving the first member 60 to the first member 60, the second member 66 is attached. At the time of mounting, the bracket 30 is disposed in the groove portion 50 and the vibration isolating bush 40 is attached to the bracket 30. Therefore, the outer cylinder part 46 does not need to be deformed as in the case where the vibration isolating bush 40 having the outer cylinder part 46 made of a single part is attached to the bracket 30. Therefore, the vibration isolating bush 40 can be easily attached to the bracket 30 having the hole 34 in particular.

  In addition, about the outer cylinder part 46 which consists of the 1st member 60 and the 2nd member 66, it can apply also about the structure shown in 1st Embodiment or 2nd Embodiment. When the configuration shown in the first embodiment or the second embodiment is applied, when the screw 32 is fastened, the portion located on the one surface 30a of the bracket 30 and the portion located on the back surface 30b are mainly compressed. The

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

(First modification)
As a configuration in which the groove portion 50 is provided on the entire outer surface of the outer cylinder portion 46 in the circumferential direction, and the same bracket 30 is disposed on both sides of the outer cylinder portion 46 in one of the orthogonal directions. The present invention is not limited to the above embodiment. For example, as shown in FIG. 13, in the case of the substantially U-shaped bracket 30 in which a notch 74 is formed and provided with two legs 76, the legs 76 of the bracket 30 are provided on both sides of the column part 32 a of the screw 32. Is configured to be sandwiched between the outer cylindrical portions 46. Also in this case, since the vibration isolating bush 40 is fixed to the bracket 30 at a plurality of locations, relative displacement between the bracket 30 and the anti vibration isolating bush 40 is less likely to occur. Further, it is possible to make it difficult for the vibration isolating bush 40 to fall off the bracket 30 in one of the orthogonal directions.

(Second modification)
The configuration in which the bracket 30 is inserted and disposed in the groove portion 50 and the outer cylinder portion 46 is compressed and deformed by the fastening of the screw 32 and is in close contact with the bracket 30 is not limited to the above embodiment. In the example shown in FIGS. 14 and 15, the bracket 30 has one leg portion 76 that is orthogonal to the axial direction, and the outer cylinder portion 46 corresponds to the leg portion 76 of the bracket 30, and has an outer surface. The groove portion 50 is provided only in a part in the circumferential direction. In FIG. 15, the outer tube portion 46 has the first protrusion portion 54 and the second protrusion portions 56 a and 56 b as in the third embodiment, but the present invention is also applicable to the configuration shown in the other embodiments. Can do.

(Third Modification)
In the said embodiment, the example of thickness T1 of the bracket 30> width W1 of the groove part 50 was shown. However, in each embodiment, the thickness T <b> 1 of the bracket 30 ≦ the width W <b> 1 of the groove 50 can also be set. For example, in the example shown in FIG. 16, the thickness T1 of the bracket 30 <the width W1 of the groove 50 before the fastening. Also in such a case, by fastening the screw 32, the cylindrical portion 46 is compressed in the axial direction between the head portion 32b of the screw 32 and the mounted body 80 via the washer portion 52 as shown in FIG. Can be deformed. And by this compressive deformation, the side wall surfaces 50b and 50c of the groove part 50 can be closely_contact | adhered to both the surfaces 30a and 30b of the bracket 30. FIG. 16 and 17 show an example in which the thickness T1 of the bracket 30 is smaller than the width W1 of the groove 50 in the first embodiment.

  In the case of T1 ≦ W1, as shown in FIG. 16, the outer cylindrical portion 46 does not extend in the axial direction in a state where the vibration isolating bush 40 is attached to the bracket 30. Therefore, it is necessary to make the length of the inner cylinder part 42 shorter than the length of the outer cylinder part 46 so as not to prevent the compression deformation of the outer cylinder part 46 when the screw 32 is fastened. In FIG. 16, the inner cylinder part 42 is located in the center part away from the both ends of the outer cylinder part 46 in the state before fastening. The washer portion 52 is provided on the entire surface of the outer tube portion 46.

  As described above, the thickness T1 of the bracket 30 ≦ the width W1 of the groove portion 50 can also be satisfied. However, in this configuration, it is conceivable that foreign matter enters the gap between the groove 50 and the bracket 30 before being fastened, and stress is concentrated at the place where the foreign matter is bitten in the fastened state. On the other hand, the thickness T1 of the bracket 30 described above> the width W1 of the groove portion 50 is preferable because the entry of foreign matter can be suppressed. Further, when T1> width W1, the temporarily fixed state of the vibration isolating bush 40 with respect to the bracket 30 can be stabilized.

(Fourth modification)
In the said embodiment, the washer part 52 was fixed to the outer cylinder part 46, and the anti-vibration bush 40 showed the example provided with the washer part 52. FIG. However, the vibration isolating bush 40 and the washer portion 52 can be separate members. In this case, in the state where the bracket 30 is disposed in the groove portion 50 of the vibration isolating bush 40 including the inner cylinder portion 42 and the outer cylinder portion 46, the washer portion 52 is disposed on the one surface 46 a of the outer cylinder portion 46 and the screw 32 is fastened. Should be done.

(5th modification)
Although the example of the vehicle engine was shown as the to-be-attached body 80, it is not limited to the said example. Even when the vehicle component other than the engine is used as the mounted body 80, the above-described vibration isolating bush 40, the mounting method thereof, and the electronic device 10 can be applied. Further, the above-described anti-vibration bushing 40, its mounting method, and the electronic device 10 can be applied to the mounted body 80 other than the vehicle components. The electronic device 10 is not limited to the ECU.

(Sixth Modification)
In 4th Embodiment, the washer part 52 was provided in the one surface 46a side among the end surfaces 46a and 46b of the outer cylinder part 46 which consists of the two members 60 and 66, and the example in which nothing was arrange | positioned on the back surface 46b was shown. . However, a configuration in which a plate-like metal fitting is fixed to the back surface 46b so as not to block the through holes 44 and 48 may be employed. Thereby, it can prevent that an outer cylinder part (rubber) contacts the to-be-attached body 80 directly. In addition, since the outer cylinder part 46 is formed by relatively moving the first member 60 and the second member 66 in the axial direction, and the outer cylinder part 46 (anti-vibration bushing 40) is attached to the bracket 30, the back surface 46b. Even if a metal fitting is provided on the bracket 30, the bracket 30 can be attached.

DESCRIPTION OF SYMBOLS 10 ... Electronic device, 12 ... Housing, 14 ... Upper case, 16 ... Lower case, 16a ... Flange, 18 ... Screw, 20 ... Connector, 22 ... External connector 24 ... Wire harness 26 ... Respiratory filter 28 ... Screw 30 ... Bracket 30a ... One side 30b ... Back side 30c ... End face 30ca ... -Center part, 30d ... Edge, 32 ... Screw, 32a ... Column, 32b ... Head, 34 ... Hole, 40 ... Anti-vibration bush, 42 ... Inside Cylindrical part, 44 ... through hole, 46 ... outer cylindrical part, 46a ... one surface, 46b ... back surface, 48 ... through hole, 50 ... groove part, 50a ... bottom wall surface, 50b, 50c ... side wall surface, 52 ... washer, 54 ... first projection, 56a, 56b ... Second projecting portion, 58 ... concave portion, 60 ... first member, 62 ... thick portion, 64 ... thin portion, 66 ... second member, 68 ... through hole, 70 ... 1st convex part, 72 ... 2nd convex part, 74 ... Notch, 76 ... Leg part, 80 ... Attachment body, 82 ... Screw hole,

Claims (7)

An anti-vibration bush attached to the bracket (30) of the electronic device for attenuating vibration transmitted from the attached body to the electronic device (10) fixed by screws to the attached body (80). ,
An inner cylinder portion (42) formed of metal and having a through hole (44) into which the pillar portion (32a) of the screw (32) is inserted;
An outer cylinder part (46) formed using rubber and fixed to the outer surface of the inner cylinder part;
A washer part (52) fixed to one surface (46a) facing the head part (32b) of the screw in the outer cylinder part,
The outer cylinder part is provided along the circumferential direction on the outer surface, and has a groove part (50) into which the bracket is inserted and arranged.
The washer portion is an entire region overlapping with the screw head on one surface of the outer cylinder portion in an orthogonal direction orthogonal to the axial direction of the inner cylinder portion in a state where the screw is disposed in the through hole. Provided to overlap with the bracket,
By fastening the screw, the outer cylinder portion is compressed and deformed between the head portion of the screw and the attached body via the washer portion in the axial direction, and the bottom wall surface (50a) and the side of the groove portion are compressed. Of the wall surfaces (50b, 50c), the side wall surfaces are in close contact with both surfaces (30a, 30b) of the bracket ,
The groove is provided on the entire circumference in the circumferential direction,
In one direction among the orthogonal directions, the same brackets are respectively disposed on both sides of the outer cylinder portion ,
The bracket has a hole (34);
The outer cylinder part is in close contact with the peripheral edge of the hole of the bracket on the entire circumference in the circumferential direction,
The outer cylinder part is
A cylindrical shape is fixed to the inner cylinder portion, and a thick portion (62) provided on the head side of the screw in the axial direction, and a thin portion (64) provided on the attached body side, A first member (60) having:
A second member (66) attached to the thin portion so as to face only a part of the thin portion from the end on the attached body side in the axial direction in the axial direction;
The washer part is fixed to the thick part in the first member,
The first member has a first convex portion (70) on the outer surface of the thin-walled portion, the second member has a second convex portion (72) on the inner surface, and the second convex portion in the axial direction. The second member is mounted on the first member in a state where the part is over the first convex part and is positioned closer to the washer part than the first convex part,
Of the outer surface of the thin portion, the portion that does not face the second member forms the bottom wall surface of the groove, and the end surface on the thin portion side of the thick portion and the end surface on the thick portion side of the second member are , Forming the side wall surface of the groove,
Of the first member and the second member, only the first member is disposed in the hole of the bracket, and the second member is located on the outside of the body to be taken with respect to the hole. An anti-vibration bush mounted on a member . The maximum value (D1) of the outer diameter of the bottom wall surface is set to be larger than the diameter (D2) of the hole of the bracket in a state before the screw is fastened.
2. The anti-vibration bushing according to claim 1 , wherein the outer cylindrical portion has a bottom wall surface of the groove portion that is in close contact with an end surface (30 c) facing the bottom wall surface of the groove portion in the bracket. The outer cylinder part is
As a part of the bottom wall surface, a central portion (30ca) excluding a portion within a predetermined range from both ends in the axial direction, of the end surface of the bracket that protrudes with respect to the other portion of the bottom wall surface and faces the bottom wall surface Having a first protrusion (54) that makes contact with the entire circumference,
As a part of the side wall surface, a second protrusion that protrudes with respect to the other part of the side wall surface and contacts the entire surface of the two surfaces of the bracket except for a part within a predetermined range from the inner peripheral end. (56a, 56b)
The anti-vibration bush according to claim 2 , wherein the outer cylinder part is separated from an edge (30d) formed by both surfaces and end surfaces of the bracket in a state where the screw is fastened. . The anti-vibration bush according to any one of claims 1 to 3 , wherein a width (W1) of the groove portion is shorter than a thickness (T1) of the bracket in the axial direction. 5. The anti-vibration bush according to claim 1 , wherein a surface roughness of a contact portion with the bracket is smaller than a surface roughness of a portion not in contact with the bracket in the outer cylinder portion. . The vibration-proof bushing according to any one of claims 1 to 5 , wherein the attached body is an engine of a vehicle. An electronic device screwed to a body to be attached (80),
A housing (12) containing a circuit board;
A bracket (30) attached to the housing (12);
An electronic device comprising: a vibration isolating bush (40) according to any one of claims 1 to 6, which is attached to the bracket for attenuating vibration transmitted from the attached body.

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