JPH0717182B2 - Heating device for wiper device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a heat generating device using a positive temperature coefficient semiconductor porcelain, and by heating loamol in winter, especially in cold regions, snow melting (ice) and It prevents freezing and operates the wiper smoothly.

(Prior Art) In recent years, due to a reduction in air resistance of a vehicle, an improvement in fashionability, and the like, the use of a conshield type wiper is increasing. However, in cold regions, especially in snowfall areas, the snow accumulated on the loire freezes during traveling, which causes adverse effects such as malfunction of the wiper and damage to the motor housing.

In order to solve this problem, a heat generating device for heating a lower molding by arranging a copper pipe in the lower molding and guiding radiator cooling water in the pipe has been conventionally considered (Japanese Patent Publication No. 47-10933). .

(Problems to be Solved by the Invention) However, there is a problem in that it takes time until the radiator cooling water warms up, there is a problem in immediate effect, and the structure is complicated, so that the cost is high.

For this reason, the present invention rapidly heats Loamor to melt ice and snow accumulated on Loamol and prevent freezing at the same time.
An object of the present invention is to provide a heat generating device for a wiper device that can smoothly operate the wiper.

(Means for Solving the Problems) For this purpose, the present invention specifically relates to a graphite layer (7) closely provided on the back surface of the lower molding (3) made of a metal plate, and the graphite layer (7). ), A plate-shaped positive-characteristic semiconductor ceramic (1) further closely contacted with the back surface, an insulating ring (8) surrounding the positive-characteristic semiconductor ceramic (1) and the graphite layer (7), and the insulating ring ( 8) is provided between the housing (9) and the positive-characteristic semiconductor porcelain (1) and a box-shaped housing (9) that surrounds the outside of the housing (8) and has an outer peripheral portion fixed to the lower molding (3). A spring (5) for pressing the characteristic semiconductor porcelain (1) against the graphite layer (7), and a lead wire (6) penetrating the housing (9) and connected to the spring (5). is there.

(Effects of the Invention) According to the present invention, since the temperature rises to a predetermined temperature quickly, it is excellent in immediate effect and safety, and further, the control circuit becomes easy, which is advantageous in terms of cost. .

(Example) An outline of this example will be described. As shown in FIG.
The PTC element 1 having the graphite 7 on the lower molding 3 is pressed and fixed by the spring 5, and the electric power supplied by the lead wire 6 passes through the PTC element 1 in the energizing direction to the body molding on the lower molding 3. It has been done.

The details will be described below.

Basically, as shown in the enlarged view of FIG. 2, the structure of the heating device for the lower molding is such that the positive characteristic semiconductor porcelain [hereinafter referred to as PTC element] 1 having graphite 7 is thermally and electrically contacted with the lower molding 3 of the vehicle body. It has a structure.

Further, in this embodiment, the PTC element 1 is pressed into the aluminum housing 9 using the spring 5 which is positioned by the insulating ring 8 made of resin.

In FIG. 1, 2 is a windshield, 20 is an engine hood, 21 is a wiper arm of a wiper device, 22 is a wiper blade, 23 is a pivot part of the wiper device, 24 is a cowl outer, and 25 is a cowl inner.

Further, in FIG. 2, 4 is a lead wire 6 and a housing 9.
It is a rubber bush that insulates and.

(Operation) Conventionally, as a heat generating device of the same kind, there is one that heats the lower mol using radiator cooling water, but in this conventional device, as shown in Fig. 3, it takes 8 minutes or more to operate, There is a problem in terms of immediate effect. In addition, since it is necessary to introduce cooling water into the lower molding with a copper pipe, the structure is complicated, which is a cost problem.

In this respect, according to the present invention, the PTC element is used to heat the lower molding 3, and in particular, as shown in FIG. 4, the snow (ice) accumulated on the shaded portions 10 and 11 which causes the wiper operation failure is concentrated. By heating to 1, the heater functions as an efficient heater. In addition, in FIG. 3, reference numerals 12 and 13 indicate the positions of the pivot portions of the wiper.

In terms of performance, as shown in Fig. 3, the temperature was raised to the desired temperature (+ 20 ° C) in less than 1/5 of the conventional time, and the PT
Since the C element 1 has a self-temperature control action, it is characterized by high safety and an easy control circuit.

Next, another embodiment will be described.

(Example 2) In Example 1, the lower molding 3 is directly used as the heat dissipation plate, but the same result can be obtained even if the heater structure is configured in advance and the structure is connected to the lower molding 3.

(Example 3) The shape, specific resistance, Curie point, etc. of the PTC element 1 may be freely selected in consideration of the shape of the automobile to be mounted, the heat capacity of the lower molding 3, and the like.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a lower portion of a windshield of a vehicle equipped with an embodiment of the device of the present invention, FIG. 2 is an enlarged sectional view of part II of FIG. 1, and FIG. 3 is a device shown in FIG. 2 and a conventional device. And FIG. 4 is a plan view of a vehicle windshield portion for explaining a mounting portion of the device of the present invention shown in FIG. 2 ... Windshield, 3 ... Lower molding, 1 ... Positive characteristic semiconductor porcelain, 7 ... Graphite layer, 8 ... Insulating ring, 9 ... Housing, 5 ... Spring, 6 ... Lead wire.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiya Nagaya 1-1, Showa-cho, Kariya city, Aichi prefecture Nihon Denso Co., Ltd. (72) In-house Akio Nara, 1-1, Showa-cho, Kariya city, Aichi prefecture Nidec Sozo Co., Ltd. (56) Bibliographic references Sho 55-175551 (JP, U)

Claims (1)

[Claims] 1. A heat generating device having a positive-characteristic semiconductor porcelain that generates heat when energized by a lower molding that covers the portion of the windshield wiped by the wiper device in the direction of the ground and near the wiper arm of the wiper device. A heating device for a wiper device in which a body is locally arranged, wherein the heating element is closely attached to a back surface of a lower layer made of a metal plate and a back surface of the graphite layer. A plate-shaped positive characteristic semiconductor porcelain,
An insulating ring that surrounds the positive characteristic semiconductor porcelain and the graphite layer, a box-shaped housing that surrounds the outer side of the insulating ring and has an outer peripheral portion fixed to the lower molding, and between the housing and the positive characteristic semiconductor porcelain. Is provided,
A heating device for a wiper device, comprising a spring that presses the positive-characteristic semiconductor porcelain against the graphite layer, and a lead wire that penetrates the housing and is connected to the spring.