ELECTRONIC CONTROL COMPONENT BRACKET

Abstract

An electronic control component bracket includes a bottom portion on which a plurality of elastic pieces configured to press a lower surface of an electronic control component upward are provided, and abutting stop portions configured to abut, from above, against the electronic control component that is pressed upward. The plurality of elastic pieces are all the same, all in plate width, plate thickness, plate length, and plate shape. Pressing positions of the plurality of elastic pieces at which the elastic pieces press the lower surface of the electronic control component are arranged such that, when projected in a vertical direction relative to a plane orthogonal to the vertical direction, the plurality of elastic pieces do not have rotational symmetry and line symmetry on the plane of projection so that support for the electronic control component provided by the plurality of elastic pieces are made imbalanced.

Description

BACKGROUND OF THE INVENTION

Field of the Invention

This invention relates to an electronic control component bracket for assembling an electronic control component such as an ECU to a vehicle body side.

Description of Related Art

For example, an ECU (Electronic Control Unit) of a vehicle contains a circuit board inside a casing (ECU case) and is attached to a panel member on the vehicle body side by using a bracket (Japanese Laid-Open Patent Publication No. 2006-220171).

Such a bracket absorbs traveling vibration of the vehicle by utilizing pressing with elastic pieces, and functions to suppress the acceleration (vibration frequency) applied to the ECU by the traveling vibration. This makes it possible to prevent a contact failure of a connector of the electronic control component. However, even in such a situation where the acceleration (vibration frequency) is suppressed, there is a possibility that the acceleration may be increased in a specific frequency band.

An object of this invention is to provide an electronic control component bracket that is less likely to cause a high acceleration (high-speed vibration).

SUMMARY OF THE INVENTION

In order to solve the above-described problem, an electronic control component bracket according to this invention is an electronic control component bracket for assembling an electronic control component to a vehicle body side, the electronic control component bracket including:

• • a bottom portion that is to be disposed on a lower surface side of the electronic control component, and on which a plurality of elastic pieces configured to press the lower surface upward are provided; and
  • abutting stop portions configured to abut, from above, against the electronic control component that is pressed upward, wherein,
  • the plurality of elastic pieces are all the same, all in plate width, plate thickness, plate length, and plate shape, and
  • the electronic control component bracket is a non-conductive resin molded product in which the bottom portion, the plurality of elastic pieces, and the abutting stop portions are integrally molded, preferably as a unitary structure, and
  • the electronic control component is clamped between the plurality of elastic pieces and the abutting stop portions so that relative vibration in a vertical direction is not restricted with respect to the electronic control component bracket for the electronic control component in an assembled state, and
  • pressing positions of the plurality of elastic pieces at which the elastic pieces press the lower surface of the electronic control component are arranged such that, when projected in a vertical direction relative to a plane orthogonal to the vertical direction, the plurality of elastic pieces do not have rotational symmetry and line symmetry on the plane of projection so that support for the electronic control component provided by the plurality of elastic pieces are made imbalanced.

It is noted that, in the electronic control component of this invention, the side that is pressed to the elastic pieces when the electronic control component bracket is assembled is defined as the lower surface side (lower side), and the side that is abutted and stopped by the abutting stop portion is defined as the upper side.

According to a conventional configuration, a plurality of elastic pieces are provided as stabilizers on the electronic control component bracket in order to reduce the acceleration (vibration) of the electronic control component, and the elastic pieces hold the electronic control component in a pressing state. However, those elastic pieces all have the same shape and the same pressing reaction force and press the electronic control component in a well-balanced manner. This good balance, in fact, leads to the matching of the frequency bands in which the acceleration (vibration frequency) is increased in the individual elastic pieces, resulting in a further increased acceleration in the matching frequency band. An object of this invention is to provide an electronic control component bracket that is less likely to cause a high acceleration (high-speed vibration). In order to solve the above-described problem, this invention is configured so that supports for the electronic control component provided by the plurality of elastic pieces are intentionally made imbalanced. Accordingly, the acceleration will not be increased in a specific frequency band in such a form that the individual elastic pieces resonate. That is, the acceleration peaks in the individual elastic pieces are dispersed, whereby the peak can be lowered.

There are two disclosed configurations that intentionally upset the balance of support for the electronic control component. In one form, for example as shown in FIG. 5, at least one of the plurality of elastic pieces has a shape that is different than the other of the plurality of elastic pieces so as to have a different elasticity, and pressing positions of the plurality of elastic pieces at which the elastic pieces press the lower surface of the electronic control component are arranged such that, when projected in a vertical direction relative to a plane orthogonal to the vertical direction, the plurality of elastic pieces have rotational symmetry on the plane of projection. In another form, for example as shown in FIG. 13, the plate width, plate thickness, plate length, and shape are all the same in the plurality of elastic pieces, and the pressing positions of the plurality of elastic pieces may be dispersed such that the elastic pieces do not have rotational symmetry and line symmetry on the above-described plane of projection. Although the above two forms have fundamentally different configurations, either form can solve the problem of the present invention.

In other words, the plurality of elastic pieces are the same, all in plate width, plate thickness, plate length, and plate shape, and pressing positions of the plurality of elastic pieces at which the elastic pieces press the lower surface of the electronic control component are arranged such that, when projected in a vertical direction relative to a plane orthogonal to the vertical direction, the plurality of elastic pieces do not have rotational symmetry and line symmetry on the plane of projection so that supports for the electronic control component provided by the plurality of elastic pieces are made imbalanced. Accordingly, the acceleration will not be increased in a specific frequency band in such a form that the individual elastic pieces resonate. That is, the acceleration peaks in the individual elastic pieces are dispersed, whereby the peak can be lowered.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view showing a state in which an ECU is assembled to an ECU bracket according to a reference example or embodiment of this invention;

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is a front view of FIG. 1;

FIG. 4 is a perspective view showing one reference example of the ECU bracket of FIG. 1;

FIG. 5 is a plan view of FIG. 4;

FIG. 6 is a front view of FIG. 4;

FIG. 7 is a plan view of a conventional ECU bracket;

FIG. 8 is an explanatory diagram showing the accelerations of an ECU in various frequency bands when the ECU is assembled to the conventional ECU bracket and vibration is applied to the ECU;

FIG. 9 is an explanatory diagram showing the accelerations of an ECU in various frequency bands when the ECU is assembled to the ECU bracket according to the reference example of this invention and vibration is applied to the ECU;

FIG. 10 is an enlarged view showing a first modification of the reference example of the ECU bracket shown in FIG. 1;

FIG. 11 is an enlarged view showing a second modification of the reference example of the ECU bracket shown in FIG. 1;

FIG. 12 is an enlarged view showing a third modification of the reference example of the ECU bracket shown in FIG. 1; and

FIG. 13 is a plan view showing one embodiment of the ECU bracket shown in FIG. 1.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

A reference example (an example that can solve the problem of the present invention but has a different configuration from the present invention) or embodiment of this invention will be described with reference to the drawings.

As shown in FIGS. 1 to 3, an electronic control component bracket 1 of this reference example or embodiment includes: first and second engaging portions 2, 6 (engaging portions: see FIG. 3) for assembling an electronic control component 10 to a vehicle body side; a bottom portion 3 that is to be disposed on a lower surface 10b side of the electronic control component 10 and on which a plurality of elastic pieces 3A configured to press the lower surface 10b upward are provided; side wall portions 4, 4 that stand upward so as to cover both lateral sides of the bottom portion 3; and abutting stop portions 5 that extend from upper ends of the side wall portions 4 so as to overlap to the upper surface 10a side. The electronic control component bracket 1 is a non-conductive resin molded product in which the bottom portion 3, the plurality of elastic pieces 3A, and the abutting stop portions 5 are integrally molded, preferably as a unitary structure. The electronic control component 10 is disposed on the bottom portion 3 so as to be sandwiched between the two side wall portions 4, 4 of the electronic control component bracket 1, and is brought into an assembled state in which the electronic control component 10 is clamped by being sandwiched by the elastic pieces 3A and the abutting stop portions 5.

As shown in FIG. 3, the first engaging portion 2 here is formed so as to protrude from a back surface 3b on the side, of the bottom portion 3, that is opposite to a main front surface 3a side on which the electronic control component 10 is disposed. The first engaging portion 2 here is an insertion engaging portion that is to be inserted to a first fixing hole 102H of a panel member 100 on the vehicle body side, and that is to be engaged with and fixed to a peripheral portion of the fixing hole 102H so as to be latched to the peripheral portion at the inserted location. It is noted that the first engaging portion 2 is not limited to the one described in this reference example and may be assembled to the vehicle body side in a different shape by a different engaging method.

The second engaging portion 6 here has an arm shape extending downward from the back surface 3b of the bottom portion 3 and being bent so as to be substantially parallel to the bottom portion 3 at the extension location and is formed as an elastic arm whose distal end side is elastically deformable in a vertical direction. The second engaging portion 6 here is a go-around engaging portion configured such that, when inserted to a second fixing hole 106H of the panel member 100 on the vehicle body side, the distal end side of the engaging portion goes around to the back side of the panel member 100, and a distal end portion 6A is latched to (comes into contact with) the back surface of the panel member 100. When the distal end portion 6A comes into contact with the back surface of the panel member 100, the second engaging portion 6 undergoes elastic deformation in a direction in which the distal end portion 6A side moves away from the back surface of the panel member 100, and the distal end portion 6A presses the panel member 100 from the back surface side to the front side.

When the first and second engaging portions 2, 6 are attached to the panel member 100, first, the second engaging portion 6 is passed through the second fixing hole 106H of the panel member 100. Thereafter, the first engaging portion 2 is passed through the first fixing hole 102H of the panel member 100. This brings about a state in which the first engaging portion 2 is inserted and latched to the first fixing hole 102H while the distal end portion 6A of the second engaging portion 6 presses the panel member 100 from the back surface side to the front side, thus bringing about a state in which the front surface of the panel member 100 abuts against an abutting portion 30 protruding downward from the bottom portion 3, or in other words, a state in which the first and second engaging portions 2, 6 are attached to the panel member 100.

In the bottom portion 3, the main front surface 3a is disposed so as to oppose the lower surface 10b side of the electronic control component 10. The plurality of elastic pieces 3A configured to press the lower surface 10b upward are provided on the bottom portion 3. The bottom portion 3 is made of a single member that is approximately flat, except for parts where the plurality of elastic pieces 3A are provided. The plurality of elastic pieces 3A are each formed in a substantially straight rod shape, and each distal end side thereof extends obliquely upward in a cantilevered manner at an approximately equal angle with the bottom portion 3 as a proximal end side. As shown in FIGS. 4 to 6, each of the elastic pieces 3A here extends obliquely upward in a cantilevered manner above a through hole 3H vertically extending through the bottom portion 3, with a peripheral portion of the through hole 3H as the proximal end side, and the elastic piece 3A is configured to be elastically deformable in the vertical direction, with the distal end side of the elastic piece 3A as a free end. When the electronic control component 10 has been assembled to the electronic control component bracket 1, the elastic pieces 3A are maintained in a state in which the elastic pieces 3A constantly press the electronic control component 10 upward by being bent downward (see FIG. 3).

The bottom portion 3 is provided with a pair of side wall portions 4, 4 that stand upward so as to cover both lateral sides of the bottom portion 3, in addition to the plurality of elastic pieces 3A, and each of the pair of side wall portions 4, 4 is an elastic wall portion whose upper end sides of both ends are elastically deformable independently outward in an opposing direction of the side wall portions 4, 4. As shown in FIGS. 4 to 6, the abutting stop portions 5, 5 are formed so as to protrude inward in the above-described opposing direction from the upper end sides of the side wall portions 4, 4, and have, at the top thereof, inclined surfaces 5a extending downward toward the inner side in the opposing direction. When the electronic control component 10 is assembled, the electronic control component 10 presses the side wall portions 4, 4 apart, outward in the opposing direction of the side wall portions 4, 4 by pressing the inclined surfaces 5a downward, and enters the space between the opposing side wall portions 4, 4. After the entry, the side wall portions 4, 4 are elastically restored, thus bringing about an abutting stop state in which the abutting stop portions 5, 5 abut against the electronic control component 10 from above. The abutting stop portions 5, 5 here abut against the upper surface 10a of the electronic control component 10 from above.

Meanwhile, the plurality of elastic pieces 3A of this reference example are provided such that, when vibration contained in the traveling vibration of the vehicle is applied in an assembled state in which the electronic control component 10 has been assembled to the electronic control component bracket 1 in a clamped state, the amplitude and the vibration period of at least one elastic piece 3A1 are different from those of the other elastic pieces 3A2.

The elastic pieces 3A2 here are provided so as to have a larger pressing reaction force for pressing the lower surface 10b of the electronic control component 10 than the other elastic pieces 3A1. Specifically, the elastic pieces 3A are composed of two elastic pieces 3A1 and two elastic pieces 3A2, and the plate width of the elastic pieces 3A2 is different from the plate width of the elastic pieces 3A1. This difference in the plate width makes a difference in the pressing reaction force, and hence a difference in one of the amplitude and the vibration period. When projected in a vertical direction Z to a plane orthogonal to the vertical direction Z, the four elastic pieces 3A here are provided, on the plane of projection, with two narrow-width elastic pieces 3A1 in a first diagonal direction and two wide-width elastic pieces 3A2 in a second diagonal direction, relative to the substantially rectangular main front surface 3a (see FIG. 5). It is noted that, although FIG. 5 is not a projection drawing, the elastic pieces 3A are illustrated in a plan view in the same manner as in the case of the plane of projection.

In this manner, by including, among the plurality of elastic pieces 3A, an elastic piece having a different amplitude or a different vibration period when vibration is applied, the electronic control component 10 in the above-described assembled state causes vibration having an undulating configuration (a large amplitude on the elastic piece 3A1 side, and a small amplitude on the elastic piece 3A2 side). However, such an imbalanced support configuration that allows undulation can be considered to be a configuration that varies the frequency bands in which the acceleration (vibration frequency) is increased in the individual elastic pieces 3A. That is, this imbalanced support configuration is a configuration in which the frequency bands in which the acceleration is increased in the individual elastic pieces are dispersed. Accordingly, an excessively large acceleration will not be caused in a specific frequency band by resonance.

FIG. 7 shows a conventional electronic control component bracket 1000. The same elements that constitute the above-described embodiment are denoted by the same reference numerals. In the previously described electronic control component bracket 1 (see FIG. 4) of this invention, there is a difference in plate width between the elastic pieces 3A1, 3A2. However, in the electronic control component bracket 1000 shown in FIG. 7, four elastic pieces 3A0 (3A) are the same, all in plate width, plate thickness, plate length, and shape. FIG. 8 shows the result of examining the accelerations at various frequencies in the conventional electronic control component bracket 1000 by attaching an acceleration sensor to a connector portion of the electronic control component 10 and vibrating the electronic control component 10 on a vibration platform so that a vibration in the vertical direction contained in a traveling vibration of the vehicle in a frequency band from 20 to 200 Hz is applied. On the other hand, FIG. 9 shows that when a vibration in the vertical direction contained in a traveling vibration of the vehicle in a frequency band from 20 to 200 Hz is applied, the result of examining the accelerations at various frequencies in the same manner in an assembled state in which the electronic control component 10 has been assembled in a clamped state to the electronic control component bracket 1 of this reference example. The acceleration peak that is increased in the range from 50 to 60 Hz in FIG. 8 is lowered in FIG. 9. That is, it can be seen that, in this reference example, the acceleration that is increased at a specific frequency is significantly suppressed than in the case of the conventional electronic control component bracket and is below a prescribed value (indicated by the broken lines in the drawings). In other words, when a vibration in the vertical direction contained in a traveling vibration of the vehicle in a frequency band from 20 to 200 Hz is applied in the assembled state in which the electronic control component 10 is clamped between the plurality of elastic pieces 3A1, 3A2 and the abutting stop portions 5, 5, a vertical acceleration peak of the electronic control component 10 is suppressed to be below a prescribed value set between 40 and 50 m/s².

Although the reference example of this invention has been described above, the reference example is merely illustrative, and this invention is not limited thereto. Various modifications such as additions and omissions may be made based on the knowledge of a person skilled in the art without departing from the scope of the claims.

In the following, other embodiments different from the above-described reference example, and modifications will be described. It is noted that parts having the same functions as those in the above-described reference example are denoted by the same reference numerals, and the detailed description thereof is omitted. The above-described reference example and the following examples may be combined to be implemented as appropriate as long as no technical contradiction arises.

The plurality of elastic pieces 3A in the above-described reference example include an elastic piece 3A2 having a difference in plate width from at least one elastic piece 3A1. However, as shown in FIGS. 10 to 12, the elastic pieces 3A may be provided such that one or more of the plate width, the plate thickness, the plate length, and the shape of at least one elastic piece 3A1 are different from those of the other elastic pieces 3A3, 3A4, 3A5. Specifically, FIG. 10 shows an example of an elastic piece 3A3 having a plate thickness larger than that of the elastic piece 3A1, FIG. 11 shows an example of an elastic piece 3A4 having a plate length smaller than that of the elastic piece 3A1, and FIG. 12 shows an example of an elastic piece 3A5 having a shape different from that of the elastic piece 3A1.

The pressing positions of the plurality of elastic pieces 3A in the above-described reference example at which the elastic pieces 3A press the lower surface 10b of the electronic control component 10 are arranged such that, when projected in a vertical direction Z relative to a plane (a horizontal projection plane defined by X and Y directions) orthogonal to the vertical direction Z, the four elastic pieces 3A have rotational symmetry on the plane of projection (see FIG. 5). It is noted that, although FIG. 5 is not a projection drawing, the elastic pieces 3A are illustrated in a plan view in the same manner as in the case of the plane of projection. However, the pressing positions of the plurality of elastic pieces 3A may be dispersed such that the elastic pieces 3A do not have rotational symmetry and/or line symmetry on the above-described plane of projection (see FIG. 13). In the case of this embodiment, even if the plurality of elastic pieces 3A are the same, all in plate width, plate thickness, plate length, and shape, the imbalanced pressing positions make it possible to form a support configuration for the electronic control component 10 that produces undulation, as in the case of the above-described reference example. Accordingly, it is possible to cause differences in the pressing reaction forces and the amplitudes of the individual elastic pieces 3A, thus reducing the acceleration that is increased at a specific frequency, as in the case shown in FIG. 9.

DESCRIPTION OF THE REFERENCE CHARACTERS

• • 1 electronic control component bracket
  • 10 electronic control component
  • 10 a upper surface of electronic control component
  • 10 b lower surface of electronic control component
  • 2 engaging portion
  • 3 bottom portion
  • 3 a main front surface of bottom portion
  • 3A elastic piece
  • 4 side wall portion
  • 5 abutting stop portion
  • 5 a inclined surface

Claims

1. An electronic control component bracket for assembling an electronic control component to a vehicle body side, the electronic control component bracket comprising: a bottom portion that is to be disposed on a lower surface side of the electronic control component, and on which a plurality of elastic pieces configured to press the lower surface upward are provided; andabutting stop portions configured to abut, from above, against the electronic control component that is pressed upward, wherein,the plurality of elastic pieces are all the same, all in plate width, plate thickness, plate length, and plate shape, andthe electronic control component bracket is a non-conductive resin molded product in which the bottom portion, the plurality of elastic pieces, and the abutting stop portions are integrally molded as a unitary structure, andthe electronic control component is clamped between the plurality of elastic pieces and the abutting stop portions so that relative vibration in a vertical direction is not restricted with respect to the electronic control component bracket for the electronic control component in an assembled state, andpressing positions of the plurality of elastic pieces at which the elastic pieces press the lower surface of the electronic control component are arranged such that, when projected in a vertical direction relative to a plane orthogonal to the vertical direction, the plurality of elastic pieces do not have rotational symmetry and line symmetry on the plane of projection so that support for the electronic control component provided by the plurality of elastic pieces are made imbalanced.

2. The electronic control component bracket according to claim 1, wherein: the plurality of elastic pieces are arranged so that when a vibration in the vertical direction contained in a traveling vibration of the vehicle in a frequency band from 20 to 200 Hz is applied in the assembled state in which the electronic control component is clamped between the plurality of elastic pieces and the abutting stop portions, a vertical acceleration peak of the electronic control component is configured so that it is below a prescribed value set between 40 and 50 m/s2.

3. The electronic control component bracket according to claim 1, wherein: a number of the plurality of elastic pieces is precisely three.

4. The electronic control component bracket according to claim 1, wherein: the electronic control component is an Electric Control Unit that contains a circuit board inside a casing.

5. The electronic control component bracket according to claim 1, wherein: the bottom portion is provided with a pair of side wall portions that stand upward so as to cover both lateral sides of the bottom portion, in addition to the plurality of elastic pieces, and each of the pair of side wall portions is an elastic wall portion whose upper end sides of both ends are elastically deformable independently outward in an opposing direction of the side wall portions, the abutting stop portions are formed so as to protrude inward in the opposing direction from the upper end sides of the side wall portions, and have, at tops thereof, inclined surfaces extending downward toward an inner side in the opposing direction, andwhen the electronic control component is assembled, the electronic control component presses the side wall portions apart, outward in the opposing direction of the side wall portions by pressing the inclined surfaces downward, and enters a space between the opposing side wall portions.

6. The electronic control component bracket according to claim 1, wherein: the plurality of elastic pieces are each formed in a substantially straight rod shape, and each distal end side thereof extends obliquely upward in a cantilevered manner at an approximately equal angle with the bottom portion as a proximal end side.

7. The electronic control component bracket according to claim 1, wherein: The bottom portion is made of a single member that is approximately flat, except for parts where the plurality of elastic pieces are provided.