JP6094039B2 - Fastening member - Google Patents

Description

  The present invention relates to a fastening member used when an electric unit is attached to a vehicle body.

  Conventionally, when an electric unit is fixed to a vehicle body, a support structure that can suppress vibration caused by cantilever support has been proposed in order to suppress input vibration from the vehicle body and vibration propagation generated from the electric unit. (See Patent Document 1).

  This is because the electric unit is fixed to the vehicle body in two vertical and horizontal directions, and the vertical axis passing through the center of gravity of the electric unit is within the two vertical and horizontal support widths. Is suppressed.

Patent 3720278

  By the way, in a power unit mounting chamber or the like for mounting a power unit of a vehicle, the space is narrow, and the electric unit can be fastened to the vehicle body only from the upper surface in the vertical direction, and the support structure as in the conventional example cannot be adopted. For this reason, the fastening position of the electric unit to the vehicle body is restricted. As a result, the support rigidity of the electric unit is lowered, and there is a possibility that the fastening member to the vehicle body is damaged due to resonance due to vibration.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a fastening member that holds the electric unit fixed and is fixed to the vehicle body, and is suitable for securing support rigidity.

The present invention is directed to a support structure including a fastening member that fixes and holds an electric unit and fixes the electric unit to a vehicle body from the upper surface via a plurality of attachment points arranged outside a vertical projection surface of the electric unit. And at least one of the attachment points to the vehicle body of the fastening member is disposed on the surface including the inertial main shaft obtained from the electrical unit and the fastening member or outside the vertical projection surface of the electrical unit close to the surface , The other attachment points excluding at least one attachment point are positions on the opposite side of the electric unit from the at least one attachment point and outside the vertical projection surface of the electric unit, and the inertia main axis is It was arranged at two points apart from the containing surface .

Therefore, in the present invention , even when the electric unit can be fastened to the vehicle body only from the upper surface in the vertical direction , at least one attachment point when the resonance around the inertia main axis obtained from the electric unit component or the equivalent occurs. The vibration displacement around can be reduced, and the stress generated in the fastening member can be kept low. As a result, the support rigidity of the electric unit can be improved.

The top view of the support structure of the electric unit which shows one Embodiment of this invention. The side view from the vehicle rear of the support structure of an electric unit similarly. The side view from the vehicle side of the support structure of an electric unit similarly. The top view which shows the modification of the support structure of the electric unit of 1st Embodiment. The top view of the support structure of the electric unit which shows the 1st Example of 2nd Embodiment of this invention. The side view from the vehicle rear of the support structure of the electric unit of 1st Example shown in FIG. The top view of the support structure of the electric unit which shows the 2nd Example of 2nd Embodiment of this invention. The top view of the support structure of the electric unit which shows 3rd Embodiment of this invention. The side view from the vehicle rear of the support structure of the electric unit shown in FIG.

  Hereinafter, the support structure of the electric unit of the present invention will be described based on each embodiment.

(First embodiment)
1 to 3 are a plan view showing a first embodiment of a support structure for an electric unit to which the present invention is applied, and a side view from the vehicle rear side and the vehicle side. In FIG. 1, the support structure of the electric unit 1 fixes attachment portions 11 provided at both ends of the electric unit 1 in the left-right direction of the vehicle to attachment brackets 2 that are fastening members to the vehicle body 3. And the structure which fixes the both ends of the vehicle left-right direction of the mounting bracket 2 to the vehicle body 3 via an elastic bush etc. is provided, respectively. The mounting portions 11 of the electric unit 1 are arranged at the four corners in the lower part of the electric unit 1 and are fixed to the mounting bracket 2 via elastic bushes or the like. Here, a mass body constituted by the electric unit 1 and the mounting bracket 2 integrated through an elastic bush or the like is defined as an electric unit constituent body, and hereinafter referred to as an “electric unit constituent body”. This electrical unit arrangement comprises a plurality of inertial spindles passing through the center of gravity obtained from its own mass arrangement. In the present invention, the inertia main shaft 5 in the left-right direction of the vehicle (X direction in the drawing) of the plurality of inertia main shafts is used as a reference for mounting the mounting bracket 2 to the vehicle body.

  A mounting point 21 provided on one side of the mounting bracket 2 in the left-right direction of the vehicle and fixed to the vehicle body 3 via an elastic bush intersects the mounting bracket 2 with the vertical plane S including the inertia main shaft 5 obtained from the electric unit structure. Arranged at one point. An attachment point 22 fixed to the vehicle body 3 via an elastic bush provided on the other side of the attachment bracket 2 in the vehicle left-right direction is a vehicle front-rear direction with respect to the vertical plane S including the inertia main shaft 5 obtained from the electric unit structure. Are arranged at two points apart from each other. In addition, the height position of the attachment points 21 and 22 to the vehicle body 3 of the attachment bracket 2 is made into the substantially same surface.

  As described above, the other mounting point 22 of the mounting bracket 2 is disposed in the vehicle longitudinal direction with respect to the vertical plane S including the inertia main shaft 5, while the one mounting point 21 of the mounting bracket 2 includes the inertia main shaft 5. The vertical surface S and the mounting bracket 2 are arranged at one point where they intersect. For this reason, the virtual support shaft and the inertia main shaft 5 of the electric unit component body can be approximated in the vertical direction by the attachment points 21 and 22 in the left and right direction of the mounting bracket 2 to the vehicle body 3. Therefore, even if the electric unit 1 is vibrated in the vertical direction due to input vibration from the vehicle or vibration generated from the electric unit 1, the moment of inertia acting on the mounting bracket 2 can be minimized. For this reason, even when the resonance around the inertial main shaft 5 obtained from the electric unit constituting body or a resonance corresponding thereto occurs, the vibration displacement around the support shaft of the mounting bracket 2, that is, around one mounting point 21 can be reduced. The stress generated in the mounting bracket 2 can be kept low. As a result, the support rigidity of the electric unit 1 can be improved. Further, the mounting bracket 2 can be reduced in size and thickness, and a high-strength member such as a high-strength steel plate is not necessarily required as a material used for the mounting bracket 2, and the options can be expanded. It is done.

  In the above embodiment, the mounting point 21 provided on one side of the mounting bracket 2 in the left-right direction of the vehicle is arranged at one point where the vertical plane S including the inertia main shaft 5 obtained from the electric unit structure and the mounting bracket 2 intersect. Explained things. However, as shown in FIG. 4, the attachment point 21 provided on one side of the mounting bracket 2 in the left-right direction of the vehicle is a point where the surface S ′ including the inertia main shaft 5 obtained from the electric unit structure and the mounting bracket 2 intersect. It may be arranged. Thus, in the case where the attachment point 21A provided on one side of the mounting bracket 2 in the left-right direction of the vehicle is disposed away from the surface S ′ of the inertia main shaft 5 of the electric unit constituting body, the virtual support shaft of the mounting bracket 2 The inertia main shaft 5 is displaced on the plane, and the electric unit 1 is slightly cantilevered. For this reason, it is necessary to set the deviation of the attachment point 21 from the vertical surface S or the surface S ′ of the inertia main shaft 5 within a range allowed by the rigidity of the attachment bracket 2.

  In the present embodiment, the following effects can be achieved.

  (A) A support structure including an electric unit 1 and an attachment bracket 2 that fixes and holds the electric unit 1 and is fixed to the vehicle body 3 through a plurality of attachment points 21 and 22. Then, at least one attachment point 21 of attachment points 21 and 22 to the vehicle body 3 of the attachment bracket 2 is on or close to the vertical surface S including the inertia main shaft 5 obtained from the electric unit 1 and the attachment bracket 2. It is characterized by being arranged. For this reason, even when the resonance around the inertial main shaft 5 obtained from the electric unit constituting body or according to the resonance occurs, the vibration displacement around at least one attachment point 21 can be reduced, and the stress generated in the attachment bracket 2 can be reduced. Can be kept low. As a result, the support rigidity of the electric unit 1 can be improved.

  (A) When at least one of the attachment points 21 and 22 of the attachment bracket 2 to the vehicle body 3 is arranged on the vertical plane S including the inertia main shaft 5 obtained from the electric unit 1 and the attachment bracket 2. The vibration displacement around the at least one attachment point 21 can be further reduced, and the stress generated in the attachment bracket 2 can be further suppressed. As a result, the support rigidity of the electric unit 1 can be further improved.

(Second Embodiment)
5 to 7 show a second embodiment of an electric unit support structure to which the present invention is applied. FIGS. 5 and 6 are a plan view and a side view of the first embodiment, and FIG. 7 is a plan view of the second embodiment. It is a top view. In the present embodiment, a configuration in which the position of the attachment point provided on the vertical surface including the inertia main shaft obtained from the electric unit structure or in the vicinity thereof is arranged on the inertia main shaft is added to the first embodiment. The same devices as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted or simplified.

  In the support structure for the electric unit 1 according to the present embodiment, as shown in FIGS. 5 and 6, an attachment point 21 </ b> A provided on one side of the mounting bracket 2 in the left-right direction of the vehicle is provided on the inertia main shaft 5 obtained from the electric unit structure or It is arranged in the vicinity. In order to achieve this configuration, one member 31 constituting the vehicle body 3 is configured such that the upper surface position thereof is raised to the vicinity of the height position of the inertia main shaft 5 with respect to the other member 32. Other configurations are the same as those in the first embodiment.

  In the present embodiment, an attachment point 21A provided on one side of the mounting bracket 2 in the left-right direction of the vehicle is arranged on or near the inertia main shaft 5 obtained from the electric unit structure. Therefore, the inertia acting on the mounting bracket 2 even when resonance centered on the inertia main shaft 5 obtained from the electric unit constituting body or its vicinity is generated by the input vibration from the vehicle or the vibration generated from the electric unit 1. The moment can be minimized. By suppressing the moment of inertia low, the vibration displacement with respect to the mounting bracket 2 and the mounting point 21A can be reduced, and the stress generated in the mounting bracket 2 can be suppressed low. For this reason, the support rigidity of the electric unit 1 can be further improved.

  In the support device for the electric unit 1 of the second embodiment shown in FIG. 7, the mounting portion 11 provided on the other side of the electric unit 1 of the first embodiment in the left-right direction of the vehicle is a mounting bracket 2 that is a fastening member to the vehicle body 3. Without being interposed, it is directly fixed to the vehicle body 3 via an elastic bush or the like. The mounting bracket 2 is fixed to the vehicle body 3 through the other two attachment points 22A by shortening the length in the vehicle left-right direction. In this embodiment, the mounting bracket 2 as a fastening member to the vehicle body 3 can be reduced in size, and the cost can be further reduced.

  In the present embodiment, in addition to the effects (a) and (b) in the first embodiment, the following effects can be achieved.

  (C) At least one attachment point 21A of the attachment points 21A, 22 of the attachment bracket 2 to the vehicle body 3 is arranged on the extension line of the inertia main shaft 5 obtained from the electric unit 1 and the attachment bracket 2 or close to the extension line. did. Therefore, the inertia acting on the mounting bracket 2 even when resonance centered on the inertia main shaft 5 obtained from the electric unit constituting body or its vicinity is generated by the input vibration from the vehicle or the vibration generated from the electric unit 1. The moment can be minimized. And the vibration displacement with respect to the attachment bracket 2 and the attachment point 21A can be made small, and the stress which generate | occur | produces in the attachment bracket 2 can be restrained low. For this reason, the support rigidity of the electric unit 1 can be further improved.

(Third embodiment)
8 and 9 show a third embodiment of a support structure for an electric unit to which the present invention is applied. FIG. 8 is a plan view and FIG. 9 is a side view. In the present embodiment, the position of the attachment point provided on or near the vertical plane including the inertia main axis obtained from the electric unit structure is the center of gravity of the electric unit structure and the other attachment point provided in the vehicle lateral direction. The structure arrange | positioned on the elastic main axis | shaft which ties with or its vicinity is added to 1st Embodiment. In addition, the same code | symbol is attached | subjected to the same apparatus as 1st, 2 embodiment, and the description is abbreviate | omitted or simplified.

  In the support structure for the electric unit 1 of the present embodiment, as shown in FIGS. 8 and 9, the attachment point 21 </ b> B provided on one side of the mounting bracket 2 in the left-right direction of the vehicle is connected to the gravity center G of the electric unit component and the vehicle body 3. Is arranged on or near the elastic main shaft 8 connecting the other attachment point 22 provided in the vehicle left-right direction. The other attachment points 22 provided on the vehicle body 3 in the left-right direction of the vehicle are arranged at different positions in the vehicle front-rear direction in the illustrated example, but the virtual attachment points 22B are obtained by taking an average value of both. The elastic main shaft 8 is set based on the virtual attachment point 22B. In order to achieve this configuration, one member 31 constituting the vehicle body 3 is configured such that the upper surface position thereof is raised to a height position close to the elastic main shaft 8 with respect to the other member 32. Other configurations are the same as those in the first embodiment.

  In this embodiment, the attachment point 21B provided on one side of the mounting bracket 2 in the left-right direction of the vehicle is connected to the center of gravity position G of the electric unit constituting body and the other mounting point 22B provided on the vehicle body 3 in the left-right direction of the vehicle. It arrange | positions on the main axis | shaft 8 or its vicinity.

  For this reason, the moment of inertia can be reduced with respect to the resonance centered on the elastic main shaft 8 or its vicinity obtained from the electric unit structure. By suppressing the moment of inertia low, the vibration displacement with respect to the mounting bracket 2 and the mounting point 21B can be reduced, and the stress generated in the mounting bracket 2 can be suppressed low. For this reason, the support rigidity of the electric unit 1 can be further improved.

  In the present embodiment, in addition to the effects (a) and (b) in the first embodiment, the following effects can be achieved.

  (D) At least one attachment point 21B of attachment points 21B, 22 to the vehicle body 3 of the attachment bracket 2 is electrically connected to other attachment points 22 excluding at least one attachment point 21B to the vehicle body 3 of the attachment bracket 2. The unit 1 and the center of gravity G of the mounting bracket 2 are arranged on the extension line of the elastic main shaft 8 that is connected to or close to the extension line. For this reason, the moment of inertia can be reduced with respect to the resonance centered on the elastic main shaft 8 or its vicinity obtained from the electric unit structure. By suppressing the moment of inertia low, the vibration displacement with respect to the mounting bracket 2 and the mounting point 21B can be reduced, and the stress generated in the mounting bracket 2 can be suppressed low. For this reason, the support rigidity of the electric unit 1 can be further improved.

S Vertical surface 1 Electric unit 2 Mounting bracket (fastening member)
3 Body 5 Inertial spindle 8 Elastic spindle 21, 21, A, 21B, 22 Attachment point

Claims (4)

In the fastening member that is fixed to the vehicle body from the upper surface through a plurality of attachment points that are fixedly held and held outside the vertical projection surface of the electric unit,
Least one of the point of attachment into the body of the fastening member, outside the vertical projection plane of the electric unit is brought close to the surface or on the surface including a principal axis of inertia derived from the fastening member and the electrical unit Is located at
The other attachment points excluding the at least one attachment point are positions on the opposite side of the electric unit from the at least one attachment point and outside the vertical projection surface of the electric unit. The fastening member arrange | positioned at two points spaced apart from the surface containing the said inertial main axis | shaft . The fastening member according to claim 1, wherein at least one of the attachment points of the fastening member to the vehicle body is disposed at a position on a vertical plane including the inertia main shaft obtained from the electric unit and the fastening member. . At least one of the attachment points of the fastening member to the vehicle body is disposed on an extension line of the inertia main shaft obtained from the electric unit and the fastening member or at a height position close to the extension line . The fastening member according to claim 1 or claim 2. At least one of the attachment points of the fastening member to the vehicle body includes the other attachment points excluding at least one attachment point of the fastening member to the vehicle body, and the center of gravity of the electric unit and the fastening member. The fastening member according to claim 1, wherein the fastening member is disposed on an extension line of the elastic main shaft that connects to the extension line or at a height position close to the extension line.

Images