JP2020199987A - Sensor mounting structure - Google Patents

Abstract

To suppress vibration of a sensor.SOLUTION: A sensor mounting structure for mounting a sensor 6 to detect an object on a side of a vehicle in a vehicle includes: a side frame 2; cross members 4 and 5 connected to the side frame 2; a main sill 8 which is arranged on the side frame 2; a fastening member 7 which fastens the side frame 2 to the main sill 8; and a bracket 1 which is extended from the side frame 2 to the side and has a tip on which the sensor 6 is mounted. The fastening member 7 is provided to be closer to the bracket 1 than intermediate positions M1 and M2 in a longitudinal direction of the bracket 1 and the cross members 4 and 5.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to a sensor mounting structure for mounting a sensor for detecting an object on the side of the vehicle on the vehicle.

Conventionally, a technology (so-called blind spot assist) that detects objects such as other vehicles and pedestrians existing in the blind spot of the driver of the vehicle with a camera or a sensor (hereinafter, simply referred to as "sensor") and informs the driver. Is known (see, for example, Patent Document 1). Generally, the sensors used in such techniques are attached to the vehicle frame via brackets.

JP-A-2009-151606

By the way, when the above-mentioned sensor is attached to the side frame of the vehicle to detect an object on the side of the vehicle, the bracket is laterally (left-right direction) from the side frame so that an extra in-vehicle device does not enter the detection range of the sensor. It is desirable to extend to the outside) and attach the sensor to the tip. However, in such a cantilevered bracket, the sensor at the tip is likely to vibrate due to the vibration of the side frame. Therefore, the detection accuracy of the sensor may be lowered.

The sensor mounting structure of the present disclosure was devised in view of the above-mentioned problems, and one of the purposes is to suppress the vibration of the sensor.

The sensor mounting structure disclosed here is for mounting a sensor for detecting an object on the side of the vehicle on the vehicle, and the side frame extending in the front-rear direction of the vehicle and the left and right sides of the vehicle. A fastening member that fastens a cross member that extends in the direction and is connected to the side frame, a vertical root that extends in the front-rear direction and is arranged on the side frame, and the side frame and the vertical root. And a bracket extending from the side frame to the side and to which the sensor is attached to the tip, the fastening member is the bracket from the intermediate position in the front-rear direction between the bracket and the cross member. It is characterized by being provided in close proximity to.

At the place where the fastening member is arranged, the side frame and the vertical joist are integrated, so that the rigidity is increased. Therefore, by devising the position of the fastening member with respect to the bracket as described above, the portion of the side frame to which the bracket is connected is efficiently reinforced. As a result, the vibration of the bracket is suppressed, so that the vibration of the sensor is also suppressed.

According to the sensor mounting structure of the present disclosure, vibration of the sensor can be suppressed.

It is a schematic top view which shows the lower structure of the vehicle to which the sensor mounting structure as an embodiment is applied. It is a perspective view which looked at the main part of the vehicle of FIG. 1 from an oblique rear view. It is a side view of the main part of the vehicle of FIG.

The sensor mounting structure as an embodiment will be described with reference to the drawings. The embodiments shown below are merely examples, and there is no intention of excluding the application of various modifications and techniques not specified in this embodiment. Each configuration of the present embodiment can be variously modified and implemented without departing from the gist thereof. In addition, it can be selected as needed, or can be combined as appropriate.

[1. Constitution]
The sensor mounting structure of the present embodiment is applied to the vehicle 10 shown in FIG. Hereinafter, the forward direction of the vehicle 10 is set to the front, and the left and right are determined based on the state of facing forward. Further, the direction orthogonal to both the front-rear direction and the left-right direction is defined as the vertical direction.

The vehicle 10 is a truck including a cab 11 provided with a driver's seat and a packing box 12 arranged behind the cab 11. In the present embodiment, the case where the vehicle 10 is a right-hand drive vehicle and the left side (side) of the packing box 12 is a blind spot for the driver of the vehicle 10 will be described.

The vehicle 10 is provided with two side frames 2 extending in the front-rear direction and a plurality of cross members 3 to 5 extending in the left-right direction. The two side frames 2 are arranged apart from each other in the left-right direction. The cross members 3 to 5 are arranged apart from each other in the front-rear direction, extend between the side frames 2, and are coupled to the side frames 2. In this embodiment, an example in which three cross members 3 to 5 are provided is shown.

Hereinafter, the three cross members 3 to 5 are also referred to as "No. 1 cross member 3", "No. 2 cross member 4", and "No. 3 cross member 5" in order from the front side. The No. 1 cross member 3 is provided in front of the front axle 16 that supports the front wheels 15 of the vehicle 10. The No. 2 cross member 4 is provided between the rear axle 14 supporting the rear wheel 13 of the vehicle 10 and the front axle 16 at a position closer to the front axle 16. The No. 3 cross member 5 is provided between the front axle 16 and the rear axle 14 at a position closer to the rear axle 14. The No. 1 cross member 3 is provided below the cab 11, while the No. 2 cross member 4 and the No. 3 cross member 5 are provided below the packing box 12.

The side frame 2 of the present embodiment is a so-called super frame configured to absorb an input from a road surface by elastically deforming. The side frame 2 has a substantially U-shaped cross section, and has upper and lower flanges 2a and a web 2b that connects the upper and lower flanges 2a. The ends of each of the cross members 3 to 5 are coupled to the web 2b of the side frame 2 to allow elastic deformation of the side frame 2.

As shown by the alternate long and short dash line in FIG. 1, vertical joists 8 extending in the front-rear direction are arranged on each side frame 2. Further, although not shown, the vehicle 10 is also provided with a horizontal root thickness extending in the left-right direction. These vertical joists 8 and horizontal joists are arranged in a grid pattern and support the packing box 12. The vertical joists 8 and the horizontal joists are formed of, for example, wood or aluminum in a prismatic shape.

The vehicle 10 is equipped with a sensor 6 that detects an object (for example, another vehicle or a pedestrian) in the blind spot. The sensor 6 referred to here includes a radar and a camera. The sensor 6 of the present embodiment is arranged substantially directly below the left side surface of the packing box 12 so as to detect an object existing on the left side (side side) of the vehicle 10. The height position of the sensor 6 is set so that the distance from the road surface is within a predetermined range.

The sensor 6 is attached to the side frame 2 via the bracket 1. The bracket 1 extends from the left side frame 2 to the left (side) at a position where it does not interfere with other in-vehicle devices (fuel tank, battery box, etc.). In the present embodiment, the bracket 1 arranged behind the No. 2 cross member 4 and in front of the No. 3 cross member 5 is illustrated.

As shown in FIG. 2, the bracket 1 includes an arm portion 1a extending to the left (side) from the left side frame 2 and a sensor mounting portion 1b provided at the left end (tip) of the arm portion 1a. It is provided with a fixing portion 1c provided at the right end (base end) of the arm portion 1a. The bracket 1 is formed by, for example, pressing a steel plate.

The arm portion 1a is formed so as to extend to the optimum mounting position of the sensor 6. The arm portion 1a of the present embodiment extends from the left side frame 2 to substantially directly below the left side surface of the packing box 12 with a gentle downward inclination. As a result, the sensor mounting portion 1b is arranged substantially directly below the left side surface of the packing box 12 and at a distance within a predetermined range from the road surface. The sensor 6 is attached to the sensor attachment portion 1b.

The fixing portion 1c is formed in a flat plate shape, and is arranged in contact with the web 2b of the left side frame 2 from the outside (left side in the present embodiment). In this embodiment, an example in which two front and rear fixing portions 1c are provided is shown. Each fixing portion 1c is connected to the web 2b of the left side rail 2 by, for example, a bolt and a nut. The method of connecting the fixing portion 1c to the side rail 2 is not limited to this, and welding may be used, for example.

Fastening members 7 for fastening the left side rail 2 and the vertical joist 8 are arranged at the front of the fixing portion 1c on the front side and the rear of the fixing portion 1c on the rear side, respectively. The fastening member 7 has a function of increasing the cross-sectional secondary moment of the side rail 2 by the amount of the vertical joist 8 by integrating the vertical joist 8 with the side rail 2.
In the present embodiment, the U bolt 7A arranged so as to surround the side rail 2 and the vertical joist 8, the plate 7B that sandwiches the side rail 2 and the vertical joist 8 together with the U bolt 7A, and the plate 7B are fixed to the U bolt 7A. An example is a fastening member 7 composed of a nut 7C.

Here, the arrangement of each fastening member 7 in the front-rear direction will be described in detail.
As shown in FIG. 3, the fastening member 7 on the front side (left side in FIG. 3) is in the front-rear direction with respect to the No. 2 cross member 4 which is the closest to the bracket 1 in front of the bracket 1 among the cross members 3 to 5. The distance is specified. Specifically, the fastening member 7 on the front side is provided closer to the bracket 1 (rear than the intermediate position M1) than the intermediate position M1 in the front-rear direction between the bracket 1 and the No. 2 cross member 4. .. The intermediate position M1 referred to here is based on the front end of the bracket 1 and the rear end of the No. 2 cross member 4.

Similarly, the fastening member 7 on the rear side (right side in FIG. 3) is a distance in the front-rear direction with respect to the No. 3 cross member 5 which is the closest to the bracket 1 behind the bracket 1 among the cross members 3 to 5. Is stipulated. Specifically, the fastening member 7 on the rear side is provided closer to the bracket 1 (in front of the intermediate position M2) than the intermediate position M2 in the front-rear direction between the bracket 1 and the No. 3 cross member 5. There is. The intermediate position M2 referred to here is based on the rear end of the bracket 1 and the front end of the No. 3 cross member 5.

From the viewpoint of suppressing the vibration of the bracket 1, the fastening member 7 is preferably arranged as close as possible to the bracket 1 so as not to interfere with the bracket 1. All of the fastening members 7 of the present embodiment are arranged adjacent to the fixing portion 1c of the bracket 1 with a slight gap.
Note that FIGS. 2 and 3 show two fastening members 7 arranged adjacent to the bracket 1, but the side rails 2 and the vertical joists 8 are separated from the bracket 1 in addition to these fastening members 7. They are also fastened to each other by other fastening members (not shown) arranged.

[2. Action, effect]
At the place where the fastening member 7 is arranged, the side frame 2 and the vertical joist 8 are integrated, so that the rigidity is increased. More specifically, the moment of inertia of area of the side frame 2 is increased by the amount of the vertical joist 8 integrated by the fastening member 7. Therefore, by devising the position of the fastening member 7 with respect to the bracket 1 as described above, the portion of the side frame 2 to which the bracket 1 is connected can be efficiently reinforced. As a result, the vibration of the bracket 1 is suppressed, so that the vibration of the sensor 6 can be suppressed. Therefore, it is possible to suppress a decrease in the detection accuracy of the sensor 6.

Further, in the present embodiment, since the fastening members 7 are arranged at the front and the rear of the bracket 1, the rigidity of the portion of the side frame 2 to which the bracket 1 is connected can be further increased. As a result, the vibration of the bracket 1 is further suppressed, so that the vibration of the sensor 6 can be further suppressed.

Further, in the present embodiment, since the fastening member 7 is arranged adjacent to the fixing portion 1c of the bracket 1 as close as possible, the rigidity of the portion of the side frame 2 to which the bracket 1 is connected can be further increased. This also further suppresses the vibration of the bracket 1, so that the vibration of the sensor 6 can be further suppressed.

[3. Modification example]
The configuration of the fastening member 7 described above is an example. The fastening member 7 may be any as long as it fastens the side rail 2 and the vertical joist 8, and may be, for example, an opposed bracket that diagonally fastens the side rail 2 and the vertical joist 8. Further, the above-mentioned U bolt 7A may be arranged in the direction opposite to the direction shown in FIGS. 2 and 3.
Further, the bracket of the fastening member 7 may be provided on the fixing portion 1c, and the side rail 2 and the vertical joist 8 may be fastened together with the fixing portion 1c by the fastening member 7.

At least one fastening member 7 may be provided within a range closer to the bracket 1 than the above-mentioned intermediate positions M1 and M2. According to this sensor mounting structure, even if one of the two front and rear fastening members 7 described above is omitted, the portion of the side rail 2 to which the bracket 1 is connected can be reinforced, so that the bracket 1 and the sensor 6 can be reinforced. Vibration can be suppressed.

The vehicle 10 to which the bracket 1 is applied is not limited to the truck described above.
When the vehicle 10 is a left-hand steering wheel vehicle, the driver's blind spot is on the right side (side) of the vehicle 10, so the bracket 1 is fixed to the right side rail 2 and the detection range of the sensor 6 is set to the vehicle 10. It may be set to the right of.

1 Bracket 1a Arm 1b Sensor mounting 1c Fixing 2 Side frame 2a Flange 2b Web 3 No.1 Cross member 4 No.2 Cross member (Cross member)
5 No.3 Cross member (Cross member)
6 Sensor 7 Fastening member 7A U bolt 7B Plate 7C Nut 8 Vertical joist 10 Vehicle 11 Cab 12 Packing box 13 Rear wheel 14 Rear axle 15 Front wheel 16 Front axle M1 Intermediate position M2 Intermediate position

Claims (1)

It is a sensor mounting structure for mounting a sensor that detects an object on the side of the vehicle on the vehicle.
The side frame extending in the front-rear direction of the vehicle and
A cross member extending in the left-right direction of the vehicle and connected to the side frame,
The vertical joists extending in the front-rear direction and arranged on the side frame,
A fastening member that fastens the side frame and the vertical joist,
A bracket extending from the side frame to the side and to which the sensor is attached is provided at the tip thereof.
A sensor mounting structure characterized in that the fastening member is provided closer to the bracket than an intermediate position between the bracket and the cross member in the front-rear direction.

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