JPS6181271A - Steering wheel associated with heater - Google Patents

Abstract

PURPOSE:To perform accurate temperature control through temperature sensor while to prevent malfunction of sensor by forming a heater applied on the grip section of ring while sandwiching a temperature sensing element and a heater wire with two sheets. CONSTITUTION:Heaters 3 are applied respectively on the grip sections 2 provided at the left and right sides of ring section 1 in steering wheel. A pair of left and right heaters 3 are connected in series where a temperature sensing element 4 is connected to one heater 3 while a temperature fuse 6 is connected in series with the heater wire 5 to the other heater 3. Here, the heater 3 is formed into rectangular shape while sandwiching the heater wire 5 and the temperature sensing element 4 between two sheets having inflated sections 7a, 8a at one side. The joint 10 between the heater wire 5 and the lead wire 9 is arranged between the inflated sections 7a, 8a.

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) The present invention relates to a steering wheel with a heater having a heater in the ring portion. The ring part of the steering wheel is made elastic or covered with leather to improve the driver's touch sensation with the driver's hands. In addition, a steering wheel in which a heating element is provided in the ring part has been proposed in order to eliminate the discomfort caused when the ring part is held because the ring part is cold during the winter season when the temperature is low. However, conventional heating devices for heating wheels use heating wires and heating wires.
Because the temperature sensing elements such as thermistors and thermostats are not integrated, there is a large variation in temperature during temperature control, making it difficult for the driver to control the temperature at the push part to the temperature that he or she thinks is optimal. There was an inconvenience that the mail was delayed.

(Problems to be Solved by the Invention) The present invention solves the problem in the conventional device (J) that the control of the temperature of the heater is unreliable.

Structure of the Invention (Means for Solving the Problems) As a means for solving the above-mentioned problems, the first invention i15 provides a heater that is attached to a grip part of a ring part of a steering wheel. B. [In the steering wheel, the heater adopts a configuration in which the temperature sensing element and the heater wire are sandwiched between two sheets, and in the second invention, at least the grip portion of the ring portion of the steering wheel is In a heated steering wheel equipped with a heater, the heater is
A three-degree sensing element and a heater wire are held together by two seams 1~, and a connection part between the heater wire and the lead wire is arranged outside the grip part, and the grip is placed near the connection part. An equivalent circuit whose temperature changes in synchrony with the heater circuit disposed in the area is connected in series with the heater circuit, and a thirst sensing element is provided near the equivalent circuit.

(Function) In the present invention, the heater attached to the steering wheel has a humidity sensing element and a heater wire that are sandwiched between two sheets and are integrally formed. Since temperature is detected, reliability is high and temperature variations during drying control are reduced. Further, in the second invention, an equivalent device whose temperature changes in synchronization with a heater circuit disposed in the grip portion near the connection portion between the heater wire and the lead wire disposed outside the grip portion of the ring portion of the steering wheel is provided. The circuit is connected in series to the heater circuit, and the temperature sensing element is placed near the equivalent circuit, so even though the temperature sensing element is placed outside the grip, the humidity sensing element is It is possible to detect the temperature corresponding to the temperature of the grip and accurately control the temperature. Moreover, since the temperature sensing element is disposed in a place other than the grip, even if the driver grips the grip, the grip pressure is not applied to the temperature sensing element, making it difficult for the temperature sensing element to malfunction.

(Example 1) A first example embodying the present invention will be described below with reference to FIGS. 1 to 4. Heaters 3 are attached to grip portions 2 provided on both left and right sides of a ring portion 1 of the steering wheel. A pair of left and right heaters 3 attached to the grip part 2 are connected in series, and the heater 3 mounted on one side (in FIG. 1) has a temperature sensing element 4 approximately in its center. A thermistor is provided, and a temperature sensor 6 for preventing overcurrent and overheating is connected in series with the heater wire 5 to the heater 3 mounted on the other side (on the right side in FIG. 1).

As shown in FIG. 3, the heater 3 has a substantially rectangular plane and has a heater wire 5 and a temperature sensing element 4 between two sheets 7 and 8 each having bulges 7a and 8a formed on one side thereof. It is formed by clamping a thermistor. The connecting portion 10 between the heater wire 5 and the lead wire 9 is connected to the sea 1-
7.8 is disposed between the bulges 7a and 8a. Said 2
Among the sheets 7.8, one of the sheets 7, which becomes the inner side when attached to the steering wheel, is made of 100% polyester fiber in twill or chive weave = 6-, and is elasticated with dynamic treatment. The outer sheet 8 is made of polynysdel 10, which has less elasticity than the one sheets 1 to 7.
It is made of a nonwoven fabric that has been subjected to dynamic treatment at 0%. Therefore, when the heater wire 5, etc. is clamped between both sheets 7.8, as shown in FIG. Seat 1-8 is held flat without any unevenness.

When the heater 3 formed as described above is mounted on a steering wheel, the rectangular part of the heater 3 corresponds to the grip part 2 of the ring part 1, as shown in FIG.
The bulging parts 7a and 8a, to which the connecting part 10 between the heater wire 5 and the lead wire 9 is clamped, are attached to the spoke part 11 in such a manner that they correspond to the back surface thereof. In order to prevent the heat from escaping to the center of the ring part 1, the heater 3 has a polyurethane layer 13 coated on the core metal 12 of the ring part 1, and the outside thereof is covered with a polyurethane layer 13 coated with a heat insulating material such as black [1 prene rubber] around half the circumference. The outside is covered with an outer skin 15 such as genuine leather or synthetic leather.
J, is covered.

Next, we will explain the function of the heater tie/1st f-ring wheel configured as described above.5.
When the ring part 1 is cold, the operator turns on the heater 3's sweet J, the heater wire 5 is heated to a temperature of 40°C, and the outer circumference of the ring part 2 is heated to 30°C in 20 to 30 seconds.
It reaches 1α at about 0°C. [I'm thirsty] J to α sensing probe 4
, nR of the reheater wire 5 is sensed, and temperature control is performed based on it. Further, if an abnormality occurs in the heater 3 and overheating occurs in the heater wire 5, the temperature fuse 6 (which melts at about 110°C) blows out to prevent the abnormal state from continuing.

In the steering boiler with heater configured as described above, the narmistor as the temperature sensing element 4 is disposed in the part attached to the grip part 2, so that it is possible to detect temperature changes in the grip part 2. Since it can be directly detected, it becomes easy to control the temperature so that the grip part 2 is in an optimal condition, and since the temperature 1η of the heater 3 is directly detected, reliability is increased.

(Embodiment 2) Next, an embodiment embodying the M2 invention will be described with reference to FIG. In this embodiment, the structure of the heater 3 attached to the steering wheel is different from that of the first embodiment. That is, the bulges 7a and 8a provided on the back surface of the spoke portion 11 when mounted on the steering wheel.
Connection part 10 between heater wire 5 and lead wire 9 arranged in
An equivalent circuit 16 is disposed near the heater wire 5 by bending the heater wire 5 at a small pitch so that the temperature changes in synchronization with the heater circuit of the portion attached to the grip portion 2. A thermistor as the temperature sensing element 4 is disposed near the equivalent circuit 16. The heater 3 constructed in this way is installed in place of the heater 3 installed on the left side of FIG. 1. Therefore, in the heated steering wheel of this embodiment, since the thermistor as the temperature sensing element 4 senses the temperature change in the equivalent circuit 16, the humidity is controlled so that the temperature of the grip portion 2 reaches a predetermined temperature as in the previous embodiment. Increased reliability when using In addition, in the steering wheel of the present invention, the temperature sensing element 4 is disposed in a part outside the grip, so when operating the steering wheel in the driver's seat, it is necessary to grip the part corresponding to the temperature sensing element 4. Since no pressing force is applied to the temperature sensing element, failure of the temperature sensing element 4 is less likely to occur. In addition, generally, the heater 3 in the part where the temperature sensing element 11 is disposed is a protrusion, so if you touch the protrusion when operating the steering wheel, you may feel uncomfortable. The temperature sensing element 4 is disposed in a part other than the part 2 (there is no risk of it happening).

It should be noted that the present invention is not limited to the above-described embodiments, and for example, the heater 3 may be attached to a grip portion. Itato ring part 1
It can also be attached to the thermostat 1, or it can be attached to the grip part 2 and used to detect the temperature on the heater of one of the pair. Set the element to overheat protection 11 or overcurrent protection + I- element (
J, change the shape of the heater 3, arrange a temperature sensing element on the heater wire 5, change the wiring shape of the heater wire 5, etc. without departing from the spirit of this invention. It is also possible to change the configuration etc. arbitrarily.

Effects of the Invention As described in detail, according to the present invention, since the wet pox sensing element is integrated into the heater, the temperature of the heater can be directly detected, thereby increasing the reliability of temperature control. Furthermore, in the second invention, an equivalent circuit whose temperature changes in synchronization with the heater circuit arranged in the jR section is arranged outside the metropolitan area, and the temperature change of the equivalent circuit is detected by a temperature sensing element. The wetness 1α control of the suppressing part can be controlled with high reliability as in the first invention, and the temperature sensing element is pressed so that the driver does not press the part corresponding to the lag 1α sensing element. Furthermore, the driver does not have to touch the protrusion formed on a part of the reheater due to the arrangement of the temperature sensing element, so there is less risk of the driver feeling uncomfortable. Qin.

[Brief explanation of drawings]

Fig. 1 is a front view of a steering wheel in which the first invention is weaponized, Fig. 2 is an enlarged sectional view taken along the line A-A in Fig. 1, and Fig. 3
FIG. 4 is a partially cutaway plan view of the heater, FIG. 4 is an enlarged sectional view of the main part of the heater, and FIG. 5 is a partially cutaway plan view showing the heater of the second invention. Grip part 2, heater 3, thirst sensing cord 4, heater wire 5
, seat 7.8, spoke portion 11, equivalent circuit 16° Patent applicant Toyoda Gosei Matsushita Electric Industrial Co., Ltd. Toyota Motor Corporation 71

Claims (1)

[Claims] 1. In a steering wheel equipped with a heater in which a heater (3) is attached to at least a grip part (2) of a ring part (1) of the steering wheel, the heater (3) is equipped with a temperature sensing element (4). A steering wheel with a heater, characterized in that it is formed by sandwiching a heater wire (5) between two sheets (7, 8). 2. The steering wheel with a heater according to claim 1, wherein the temperature sensing element (4) is arranged on the heater wire (5). 3. In a steering wheel with a heater in which a heater (3) is attached to at least the grip part (2) of the ring part (1) of the steering wheel, the heater has two temperature sensing elements (4) and two heater wires (5). sheet (7
, 8), and the heater wire (
5) and the lead wire (9) are arranged in a place other than the grip part (2), and a heater circuit arranged in the grip part (2) is arranged near the connection part (10). An equivalent circuit (16) whose temperature changes synchronously is connected in series to the heater circuit, and a temperature sensing element (4) is placed near the equivalent circuit (16).
) A steering wheel with a heater. 4. The steering wheel with a heater according to claim 3, wherein the equivalent circuit (16) is formed by wiring heater wires (5) in a meandering manner at a small pitch. 5. The steering wheel with a heater according to claim 4, wherein the temperature sensing element (4) is arranged on the heater wire (5) constituting the equivalent circuit.