JPH1172395A - Burying method for sensor in sandwiching preventive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost of a device by a method wherein a sensor is buried easily in a protector part. SOLUTION: A sandwiching protective device 20 is constituted so as to be attached to the motorized slide door of an automobile. In this case, a protector part 23 is vulcanized and molded of a material in which 30 to 70 pts.wt. of polyethylene is mixed with 100 pts.wt. of EPDM rubber. After the protector part 23 is molded, its hollow part 24 is heated, a high-temperature and high- pressure gas is filled into the hollow part 24 so as to be pressurized and then cooled, and a sensor 22 is inserted loosely into the expanded hollow part in a state that the inside diameter of the hollow part 24 is expanded. In addition, the hollow part 24 is heated again, it is shrunk to a state which is prior to the expansion of the inside diameter of the hollow part by the high-pressure gas, and the sensor 22 is fitted closely into the hollow part 24 without any gap.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for embedding a sensor in a protector of an anti-jamming device mounted on an electric sliding door of an automobile.

[0002]

2. Description of the Related Art A description will be given with reference to FIGS.
In an automobile having a mechanism in which a door is automatically opened and closed and locked, the door is automatically closed as an anti-jamming device 20 for preventing a human body from being pinched between the door and the body. At this time, there is a mechanism that stops the door closing and opens the door immediately by sensing the pressure by the human body sandwiched. This is controlled by a motor, a controller, sensors 22 and the like.

In this conventional pinching prevention device 20, a sensor 22 for sensing a pressure when a human body is pinched has a plurality of electrodes running in the longitudinal direction inside the sensor 22, and this electrode is made of rubber and heat. It has a substantially circular cross section integrally formed by coating with an insulating material such as a plastic elastomer. A lead wire 25 extends from an end of the sensor 22 through a lead wire lead-out portion, and a connector 26 for connecting to a controller is connected to an end of the lead wire.

The sensor 22 is buried in the center of a protector 23 having a hollow cross section, and the sensor 22 and the protector 23 constitute a sensor function unit 21 for detecting pressure.

[0005] The sensor 22 is connected to the controller with the rated current flowing at all times. When the sensor 22 receives pressure when the door is closed, the sensor 22 bends.
A plurality of internal electrodes come into contact with each other to be turned on, and the controller issues an instruction to stop and open the door based on the electric signal.

The sensor 2 of the conventional anti-jamming device 20
2 has a diameter as small as 8 mm or less, preferably 4 to 7 mm, and its length is about 1.2 m, which is almost the same as the door height.
Therefore, the man-hour for inserting from the end of the protector section 23 becomes large, so that the cost for embedding the sensor 22 and the cost of the pinch prevention device 20 increase.

In order to facilitate the insertion of the sensor 22 into the protector 23, a gap G may be provided between the protector 23 and the sensor 22, as shown in FIG. However, if the gap G is set to be large, it is difficult for the sensor 22 to detect the pressure due to the play due to the gap G, and the sensor 22 is susceptible to the influence of vibration of the automobile, so that there is a problem in durability.

The gap G where such a problem is unlikely to occur is 0.4.
mm or less, but as the gap G approaches zero, the number of insertion steps increases and the complexity increases. Further, if the gap is designed to be negative, the initial load based on only the protector section 23 is applied to the sensor 22, and the sensor malfunctions. When powder such as talc or silicon oil is applied to the surface of the sensor 22 to improve the slidability and facilitate the insertion, the number of insertion steps can be reduced, but the working environment is deteriorated or the sensor is deteriorated. 22 may malfunction due to the influence of moisture, resulting in poor reliability.

[0009]

In the conventional anti-jamming device 20, it is difficult to embed the sensor 22 in the protector portion 23, which increases the cost of the device.

[0010]

A description will be given with reference to FIGS. 1 to 3 and FIGS. 5 and 6. In the first invention, in a pinch prevention device 20 attached to an electric sliding door 10 of an automobile, a protector portion 23 having a hollow cross section is formed by an E.
30 to 100 parts by weight of PDM rubber
Vulcanizing with 70 parts by weight of the mixed material, heating the protector portion 23 after molding, filling the hollow portion 24 with a high-pressure gas, pressurizing, and then cooling to expand the inner diameter of the hollow portion 24. A step of loosely inserting the sensor 22 into the enlarged hollow part 24, a step of reheating and contracting the hollow part 24 under the atmospheric pressure into which the sensor 22 is inserted, and embedding the sensor 22 in the hollow part 24 without any gap. It consists of

According to a second aspect of the present invention, in the first aspect, the heating temperature and the reheating temperature are set to 120 ° C. to 200 ° C., and the pressure is set to more than 1 atm.

[0012]

Embodiments of the present invention will be described. In the present invention, in the anti-jamming device 20 attached to the flange 11 of the electric sliding door 10 of an automobile, first, the protector 23 having a hollow cross section is mixed with 30 to 70 parts by weight of polyethylene with respect to 100 parts by weight of EPDM rubber. Vulcanization molding with the material.

In this case, if the amount of the polyethylene to be mixed is less than 30 parts by weight with respect to 100 parts by weight of the EPDM rubber, the shape of the hollow portion is difficult to expand when heated and pressed. If it exceeds 70 parts by weight, even if the expanded hollow shape is reheated, it is difficult to shrink to the original size.

After the vulcanization molding, the hollow portion 24 of the protector portion 23 is heated with heat of 120 ° C. to 200 ° C., and a gas exceeding 1 atm is filled in the hollow portion 24 at a high temperature, and then the pressure is applied. The inside diameter of the part 24 is enlarged.

In this case, if the heating temperature is lower than 120 ° C., the hollow shape does not expand when the hollow shape is expanded, and the hollow shape does not shrink when the hollow shape shrinks. When the heating temperature is 2
If the temperature exceeds 00 ° C., the aging of the base rubber proceeds, and the hollow portion becomes brittle.

Next, as shown in FIG. 5, the sensor 22 is loosely inserted into the hollow portion 24 having an enlarged inner diameter. By applying heat again at 120 ° C. to 200 ° C. to the hollow portion 24 into which the sensor 22 is inserted while the inside of the hollow portion 24 is at atmospheric pressure, the hollow portion 24 expanded by the high-pressure gas is applied.
To shrink. Thereby, the hollow portion 24 and the sensor 2
The sensor 22 is buried in the hollow portion 24 without forming a gap between the sensor 22 and the hollow portion 24 without an external force being applied to the hollow portion 24 from the outer periphery.

When the hollow portion 24 is enlarged, the insertion space S, which is temporarily formed between the enlarged protector portion 23 and the sensor 22 in FIG. Is easy to achieve. Also,
The necessary pressure varies depending on the diameter and thickness of the hollow portion, and is appropriately set in accordance with these.

The anti-jamming device 20 according to the present embodiment comprises:
It is composed of a sensor function part 21 and a substantially U-shaped mounting part 29 mounted on the flange 11 of the electric sliding door 10. The mounting part 29 has a rigidity to enhance the mounting force on the flange 11. A core bar 27 is embedded, and a lip 28 for maintaining an assembling force with the flange 11 is provided.

The protector portion 23 may be formed into a sponge shape by further mixing a foaming material with the material forming the protector portion 23. In addition, after the sensor 22 is inserted, it is preferable to add a terminal molding to the end of the protector portion 23 in order to improve the waterproofness in the hollow portion 24 and the appearance of the exterior.

The operation will be described. In the state where the inner diameter of the hollow portion 24 of the protector portion 23 is enlarged,
After the insertion of the sensor 22 into the inside 4, the hollow portion 24 was contracted to the state before the inner diameter was enlarged.
Can be easily buried with a small number of man-hours.
No gap is formed between the protector portion 23 and the sensor 22 and the protector portion 23
Since no external force based only on the external force is applied, the detection capability of the sensor 22 can be kept high, and the durability does not decrease due to vibration or the like.

[0021]

After the sensor 22 is inserted by expanding the inner diameter of the hollow portion 24 of the protector portion 23, the hollow portion 24 is contracted to the original inner diameter.
Of the sensor 22 and the manufacturing cost of the anti-jamming device 20 can be reduced.
Since no gap is formed between the sensor 3 and the sensor 22, the detection capability and durability of the sensor 22 can be maintained in an excellent state for a long time.

[Brief description of the drawings]

FIG. 1 is a side view showing an automobile and a slide door to which an anti-jamming device is attached.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is an overall elevation view of the pinch prevention device.

FIG. 4 is a sectional view taken along line BB of FIG.

FIG. 5 is a sectional view of an anti-jamming device showing the method of the present invention.

FIG. 6 is a cross-sectional view taken along the line BB of FIG. 3, illustrating the anti-trapping device formed by the method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Electric sliding door 11 Flange 20 Anti-trapping device 21 Sensor function part 22 Sensor 23 Protector part 24 Hollow part 25 Lead wire 26 Connector 27 Core metal 28 Lip 29 Mounting part 30 Body G Gap S Insertion gap

Claims (2)

[Claims] 1. An anti-jamming device (20) mounted on an electric sliding door (10) of an automobile, wherein a protector portion (23) having a hollow cross section is made of 30 to 70 parts by weight of polyethylene with respect to 100 parts by weight of EPDM rubber. Step of vulcanizing and molding the mixed material. After the molding, the protector section (23) is heated, a high-pressure gas is charged into the hollow section (24), pressurized, and then cooled to cool the hollow section (24). A step of loosely inserting the sensor (22) into the enlarged hollow portion (24) in the step of expanding the inner diameter of the sensor (2);
2) A method of embedding a sensor in an anti-jamming device, comprising a step of reheating and shrinking the hollow portion (24) at atmospheric pressure into which the inserted sensor (22) is inserted without any gap in the hollow portion (24). 2. An anti-jamming device (20) attached to an electric sliding door (10) of an automobile, wherein a protector portion (23) having a hollow cross section is made of 30 to 70 parts by weight of polyethylene with respect to 100 parts by weight of EPDM rubber. After vulcanizing and molding the mixed material, after the molding, the protector part (23) is heated at 120 ° C to 200 ° C and a gas exceeding 1 atm is filled into the hollow part (24) at a high temperature and pressurized. In the step of cooling and expanding the inner diameter of the hollow portion (24),
Step of loosely inserting the sensor (22) into the enlarged hollow portion (24), inserting the sensor (22), and heating and shrinking the hollow portion (24) under atmospheric pressure again at 120 ° C to 200 ° C. A method of burying the sensor (22) in the hollow portion (24) without gaps.