JPH11271423A - Ultrasonic sensor attaching structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ultrasonic sensor attaching structure which can surely prevent an ultrasonic sensor attached to a vehicle from being loosened by vibration, etc., of the vehicle without increasing the number of parts. SOLUTION: An ultrasonic sensor attaching structure is provided with a saw-tooth section having triangular teeth each composed of a gentle slope and a steep slope on one end face of the outer peripheral section of a nut fitted on the male screw section 1 of a cylindrical ultrasonic sensor 7, having the male screw section 1 on its outer periphery, a rib 8 larger than the diameter of the thread of the male screw section 1 around the cylinder, and a pawl section 9 integrally molded with the sensor 7 in the direction perpendicular to the threads of the male screw section 1 and the rib 8, for fixing the sensor 7 to the bumper 3 of a vehicle by tightly engaging the nut and male screw section 1 with each other on both sides of the bumper 3 of a vehicle after the sensor 7 is inserted into the attaching hole 4 of the bumper 3, etc., of the vehicle.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure of an ultrasonic sensor in a vehicle obstacle detecting device which detects an obstacle around a vehicle using an ultrasonic wave and notifies the driver of the obstacle.

[0002]

2. Description of the Related Art As shown in FIG. 5, a conventional ultrasonic sensor mounting structure for an obstacle detecting device for a vehicle includes an ultrasonic sensor 2 having a male screw portion 1 on a cylindrical outer peripheral portion and a bumper 3 or the like. When sandwiched between the mounting holes 4 that have been drilled and fastened and fixed with nuts 5 or the like,
In order to prevent loosening, a method has been adopted in which a special washer 6 for preventing loosening is inserted between the bumper 3 and the nut 5 and fixed. The exclusive washer 6 is mainly made of a rubber material or the like that has a large sliding resistance with the bumper 3 and the nut 5 and is not easily loosened.

[0003]

However, the conventional ultrasonic sensor mounting structure requires special parts for preventing loosening due to vibration of the vehicle and the like, resulting in an increase in the number of parts and an increase in cost. Was.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an ultrasonic sensor mounting structure capable of reliably preventing loosening due to vehicle vibration without increasing the number of parts. It is intended for.

[0005]

According to the present invention, there is provided an ultrasonic sensor mounting structure comprising: a male screw portion provided along an outer peripheral portion of a cylindrical ultrasonic sensor; and a male screw thread provided on one end surface of the cylindrical member. An ultrasonic sensor in which a rib larger than the diameter is provided on the entire circumference of the cylinder, and a claw portion perpendicular to the rib is formed integrally with the resin so as to be orthogonal to the thread direction of the male screw portion at one or several places of the rib, In order to insert into a mounting hole pre-drilled in a vehicle bumper or the like, and to clamp and fix the bumper or the like, on one side end surface of the cylinder outer peripheral portion of the nut to be engaged with the male screw, a gentle slope and a steep slope are formed. A substantially triangular cross-section saw-tooth portion is provided by being integrally molded with resin at a position one step lower than the contact surface to the bumper, etc., and when tightening the nut to the male screw portion of the ultrasonic sensor, at the final stage of tightening,
The claws of the ultrasonic sensor and the serrated portions of the nut are slidably contacted and meshed with each other so that the nut can be tightened and the nut is prevented from loosening.

[0006] Further, a nut having a sawtooth portion for clamping and fixing the ultrasonic sensor between bumpers or the like,
On the outer periphery of the sawtooth portion, a sawtooth portion having a substantially triangular cross section including a gentle slope and a steep slope is provided by integrally molding resin on a surface that comes into contact with a bumper or the like, and when tightening the nut to the bumper or the like, This is a means for solving the problem by having a configuration in which the saw tooth bites into a bumper or the like to prevent loosening of the nut with a double structure.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a mounting structure of an ultrasonic sensor in an obstacle detecting device for a vehicle according to the present invention, in which a male screw portion 1 is provided on an outer peripheral portion of a cylindrical ultrasonic sensor 7 and the male screw portion is provided on one end surface of the cylinder. A rib 8 larger than the mountain diameter is provided on the entire circumference of the cylinder. In one or several places of the rib 8, the rib 8 is perpendicular to the thread direction of the male screw part 1.
Are formed by integrally molding a claw portion 9 with the resin. The ultrasonic sensor 7 thus configured is inserted into a mounting hole 4 previously formed in a bumper 3 or the like of the vehicle, and the bumper 3 or the like is sandwiched and fastened and fixed. On the end surface, a sawtooth portion 13 having a substantially triangular cross section composed of a gentle slope 11 and a steep slope 12 is integrally molded with resin at a position one step lower than the contact surface 14 for the bumper 3 or the like. In addition,
Reference numeral 15 denotes an electric wire for transmitting / receiving a signal to / from the ultrasonic sensor 7.

FIG. 2 is a perspective view of the ultrasonic sensor according to the present invention in an arrow A direction in a mounted state, and shows a final stage of tightening the ultrasonic sensor 7 and the nut 10. The tip of the claw portion 9 of the ultrasonic sensor 7 is tapered as shown in FIG. 2, and the gentle slope 11 and the steep slope 12 of the nut 10 are formed.
The shape is such that it can smoothly mesh with the sawtooth portion 13 having a substantially triangular cross section. The gentle slope 11 and the steep slope 12 of the nut 10 can be easily tightened and hard to loosen by providing the gentle slope 11 in the tightening direction and the steep slope 12 in the loosening direction.

The operation of the ultrasonic sensor mounting structure thus constructed will be described below. When the nut 10 having the sawtooth portion 13 integrally formed with resin is fastened to the male screw portion 1 of the ultrasonic sensor 7 fitted in the mounting hole 4 of the bumper 3 or the like, at the final stage of the tightening, the ultrasonic sensor 7 and a saw-tooth portion 1 of a nut 10 integrally formed with resin.
3 are engaged while being in sliding contact with each other and tightened. At this time, the claw portion 9 of the ultrasonic sensor 7 gets over the sawtooth portion 13 of the nut 10 due to the resiliency of the resin, and can be tightened.
The shape and positional relationship are determined so that the claw portion 9 of the ultrasonic sensor 7 meshes with the valley of the sawtooth portion 13 of the nut 10 in a completely tightened state. Further, since the nut 10 is provided with a gentle slope 11 in the tightening direction and a steep slope 12 in the loosening direction, the nut 10 has an effect of being easily tightened and not easily loosened.

FIG. 3 shows another embodiment of the ultrasonic sensor mounting structure according to the present invention, in which a nut 10 having a saw-tooth portion 13 for clamping and fixing the ultrasonic sensor 7 to the bumper 3 or the like is attached to the nut 10. The gentle slope 1 on the outer periphery of the part 13
6 and a steep slope 17, a sawtooth portion 18 having a substantially triangular cross section,
An example of a nut 19 molded integrally with a resin on a surface 14 that contacts the bumper 3 or the like is shown.

FIG. 4 is a perspective view of an ultrasonic sensor according to another embodiment of the present invention in an arrow A direction, showing a final stage of tightening the ultrasonic sensor 7 and the nut 19. Saw tooth portion 18 further provided on the outer periphery of saw tooth portion 13 of nut 19
The gentle slope 16 and the steep slope 17 are provided with a gentle slope 16 in the tightening direction and a steep slope 17 in the loosening direction, so that the structure is easy to tighten when tightening to the bumper and hard to loosen.

Next, the operation will be described. The nut 19
When tightening to the bumper 3 etc.
8 gradually penetrates the bumper 3 and the like. As shown in FIG. 4, the sawtooth portion 18 has a wedge-like shape including a gentle slope 16 and a steep slope 17, and has a shape that is easy to tighten and does not easily loosen. It is clear that once bitten into the bumper 3, it is difficult to return due to the wedge shape. As described above, the loosening of the nut 19 is combined with the above-described loosening prevention mechanism,
This is a means for solving the problem by having a double loosening prevention structure.

[0013]

According to the ultrasonic sensor mounting structure having the above-described structure, the mechanism for preventing the loosening due to the vibration of the vehicle or the like is eliminated, so that there is no fear of loosening. Since the claw portion on the ultrasonic sensor side, which is the main part of the mechanism, and the sawtooth portion having a substantially triangular cross section on the outer periphery of the nut are integrally molded with resin, the number of parts can be reduced.

Further, on the outer periphery of the sawtooth portion of the nut, a sawtooth portion having a substantially triangular cross section including a gentle slope and a steep slope is integrally molded with a resin, and the sawtooth portion is cut into a bumper or the like so that the nut can be cut. Looseness can be firmly prevented. As a result, a double loosening prevention mechanism can be configured without increasing the number of parts, and loosening can be strongly and inexpensively prevented.

[0015]

[Brief description of the drawings]

FIG. 1 is a mounting structure of an ultrasonic sensor according to the present invention.

FIG. 2 is a perspective view of an arrow A in an attached state of the ultrasonic sensor according to the present invention.

FIG. 3 is another embodiment of the mounting structure of the ultrasonic sensor according to the present invention.

FIG. 4 is a perspective view of an ultrasonic sensor according to another embodiment of the present invention in an arrow A direction in another embodiment.

FIG. 5 shows a conventional ultrasonic sensor mounting structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Male thread part 2 ... Conventional ultrasonic sensor 3 ... Bumper 4 ... Mounting hole 5 ... Conventional nut 6 ... Exclusive washer 7 for preventing loosening 7 ... Ultrasonic sensor according to the present invention 8 ... Rib 9 ... Claw part 10 ... Present invention 11 ... gentle slope 12 ... steep slope 13 ... serrated part 14 ... contact surface to bumper 15 ... electric wire 16 ... gentle slope 17 ... steep slope 18 ... saw tooth part 19 ... nut according to the present invention

Claims (2)

[Claims] 1. An ultrasonic sensor mounting structure for transmitting an ultrasonic wave, receiving a reflected wave from an obstacle and detecting the obstacle, and comprising a male screw portion provided along an outer peripheral portion of the cylindrical ultrasonic sensor. On one end surface of the cylindrical ultrasonic sensor, a rib larger than the external thread diameter is provided on the entire circumference of the cylinder, and one or several positions of the rib are orthogonal to the thread direction of the external thread portion. A claw perpendicular to the rib is integrally molded with a resin, and a serrated portion having a substantially triangular cross section composed of a gentle slope and a steep slope is provided on one side end surface of the cylinder outer peripheral portion of the nut to be fitted with the male screw. Ultrasonic sensor mounting structure. 2. A mounting structure for an ultrasonic sensor according to claim 1, wherein a sawtooth portion having a substantially triangular cross section is mounted on the tightening end surface of the nut according to claim 1. [0001]