JPH0699789A - Panel for preventing freezing wiper for vehicle - Google Patents

Abstract

PURPOSE:To perform easy manufacture with high processing precision at a low cost by a method wherein a heating fluid flow passage part having a panel and a hollow part, through which heating fluid flows, is an integral molded product injection-molded by using thermoplastic resin. CONSTITUTION:A panel 12 for preventing freezing of the wiper of a vehicle and a heating fluid flow passage part 14 having a hollow part through which heating fluid flows are an integral molded prod which is injection-molded by using thermoplastic resin. In this case, the heating fluid flow passage 14 is integrally molded such that a pre-molded panel 12 is placed in a mold cavity, and molten thermoplastic resin is injected in the mold cavity and thereafter, pressure gas is injected in molten thermoplastic resin to form a hollow part 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiper antifreezing panel for preventing a vehicle wiper in a locked position from freezing and sticking to a glass window.

[0002]

2. Description of the Related Art In vehicles such as automobiles, snowmobiles, and snowplows used in cold regions, the wiper in the locked position is frozen to prevent it from sticking to the glass window. The prevention panel is installed. The wiper anti-freezing panel includes a type using an electric heater, a type using a heating fluid, and the like. Since the wiper antifreezing panel of the type using an electric heater consumes a lot of battery, a wiper antifreezing panel of the type using a heating fluid is usually used.

A wiper antifreezing panel 50 of the type using a heated fluid is shown in a plan view in FIG.
As shown in the cross-sectional view taken along line BB in (B), the panel 52 is usually made of a metal plate (for example, an iron plate having a thickness of 0.6 mm) and has an outer diameter of 8 mm and a wall thickness of about 1 mm. The heating fluid flow path portion 54 is formed by flattening a copper pipe. The heating fluid channel portion 54 is attached to the panel 52 by brazing or the like.

As shown in the schematic partial cross-sectional view of FIG. 6B, this wiper anti-freezing panel 50 is mounted in a vehicle facing a windshield portion 58 to which a wiper 56 is locked. ing. In addition, in (B) of FIG.
Reference numeral 60 is a dashboard. The engine cooling water, which is hot water after cooling the engine, is made to flow in the heating fluid flow path portion 54 as a heating fluid. The heating fluid discharged from the heating fluid channel portion 54 is returned to the radiator. When the heating fluid flows in the heating fluid channel portion 54, the panel 52 made of a metal plate is heated, and the heat conduction from the panel 52 heats the glass window portion 58. As a result, the glass window portion 58 is heated. It is possible to prevent the locked wiper 56 from freezing.

[0005]

The conventional wiper antifreeze panel as described above has the following problems. (A) The heating fluid flow passage 54 is provided on the panel 52 made of a metal plate.
When attached, the panel 52 is likely to be deformed. Moreover, since the molding accuracy of the front window is generally low, it is not easy to attach the wiper freeze prevention panel 50 to the front window 58. (B) A relatively large gap is formed between the wiper freeze prevention panel 50 and the front window 58. (C) When the copper pipe is bent to form the heating fluid passage 54, the copper pipe has a small cross-sectional area at the bent portion, and the copper pipe is flat to increase the contact area with the panel. Therefore, the flow rate of the heating fluid flowing through the heating fluid channel portion 54 cannot be sufficiently secured. (D) Since the heating fluid channel portion 54 made of a copper pipe has good heat conduction, when the flow rate of the heating fluid is low, the temperature of the heating fluid flowing into the heating fluid channel portion 54 and the heating fluid channel portion 5
The difference from the temperature of the heating fluid discharged from No. 4 becomes too large, and the panel 52 has a large temperature distribution. (E) Since the panel 52 and the heating fluid channel portion 54 are made of metal, they are heavy. (F) It is extremely difficult to manufacture the panel 52 integrally with the heating fluid flow path 54. Moreover, a process such as brazing is required, many assembling processes are required, and the manufacturing cost is high.

Therefore, the present invention has a high processing accuracy,
A wiper anti-freezing panel that can be easily attached to a window or the like, can secure a sufficient flow rate of heating fluid, does not easily generate a large temperature distribution on the panel, is lightweight, and can be easily manufactured at a low cost. To provide.

[0007]

[Means for Solving the Problems]
And a heating fluid flow path section disposed on the panel, which is mounted on the inside of the vehicle facing the portion of the glass window to which the wiper is locked, the panel for preventing the wiper from freezing, the panel and the heating fluid. The heating fluid flow path portion having a hollow portion in which the air flows can be achieved by a wiper anti-freezing panel, which is an integrally molded product obtained by injection molding a thermoplastic resin.

According to a preferred aspect of the present invention, in the heating fluid flow path section, a preformed panel is mounted in a mold cavity, and a molten thermoplastic resin is injected into the mold cavity, Then, it can be integrally molded by injecting a pressurized gas into the molten thermoplastic resin to form the hollow portion.

According to another preferred aspect of the present invention, the heating fluid channel portion is formed by extruding a thermoplastic resin into a predetermined shape by an extrusion molding method or a hollow molding method, and thereafter, the heating fluid channel portion is thermoplastic. It is fixed to the panel made of resin. The heating fluid channel portion can be fixed to the panel using an adhesive, an ultrasonic bonding technique, a heat welding technique, or the like.

It is preferable from the viewpoint of heat conduction of the panel and / or the heating fluid channel section that the plastic molded article forming the panel and / or the heating fluid channel section contains a metal filler. Examples of the metal filler include copper, aluminum, and stainless steel powders, particles, fibers, and the like.

Alternatively, the cross-sectional shape of the hollow portion of the heating fluid channel portion may be a trapezoid in which the length of the lower side is longer than the upper side and the lower side faces the panel, or the chord is a bow shape that faces the panel. It is preferable from the viewpoint of heat conduction from the heating fluid channel portion to the panel. That is, the outer cross-sectional shape of the hollow portion is shown in FIG.
4A, a trapezoidal shape as shown in FIG. 4B, a semicircle as shown in FIG. 4B, and an arcuate shape as shown in FIG.

Further, the average wall thickness of the portion of the heating fluid flow passage portion which contacts the panel is larger than the average wall thickness of the portion of the heating fluid flow passage portion which faces the panel portion which contacts the panel with the hollow portion interposed therebetween. It is preferable that the thickness is thin from the viewpoint of heat conduction from the heating fluid channel portion to the panel.

The thickness of the panel is not particularly limited, but is 0.3 mm to 0.5 in terms of the temperature of the heating fluid and the heat conduction of the panel.
About mm is desirable. The panel has a width that is about the same as or less than the width of the glass window portion. The shape of the panel may be a flat plate or a shape along the glass window.

The thermoplastic resin which is the raw material of the panel and the thermoplastic resin which is the raw material of the heating fluid passage portion may be the same or different, but when the heating fluid passage portion is integrally molded, it is heated. It is more preferable to select a thermoplastic resin in which the fluid channel portion is welded to the panel as a raw material for the panel and the heating fluid channel portion.

The thermoplastic resin which is a raw material of the panel and the heating fluid flow passage portion may be any one as long as it satisfies various conditions such as chemical resistance and heat resistance required for the wiper anti-freezing panel.
Any resin can be used. As such resins, not only plastics exemplified by polyolefin resins, polystyrene resins, methacrylic resins, fluorine-containing resins, but also nylon resins, polyacrylate resins,
Although engineering plastics exemplified by polyacetal resin, polysulfone resin, modified polyphenylene ether resin and the like can be used, engineering plastics is more preferable. Here, examples of the nylon resin include nylon 66, polymeta-xylylene adipamide resin, and poly-meta-xylylene sebacamide resin. As the engineering plastics, a resin composition or a polymer alloy obtained by mixing the above may also be used.

The thermoplastic resin includes various fillers such as reinforcing fibers, in addition to the above-mentioned metal fillers for improving heat conduction.
Various additives such as pigments and stabilizers can be added.

[0017]

Since the wiper antifreezing panel of the present invention is molded using a thermoplastic resin, it can be easily manufactured with high processing accuracy and at low cost, and can be easily mounted on a window or the like. Moreover, a large temperature distribution is unlikely to occur in the panel. Moreover, since the heating fluid flows through the hollow portion of the heating fluid channel, a sufficient flow rate of the heating fluid can be secured.

If the heating fluid passage is formed integrally with the panel, or alternatively, the heating fluid passage is formed into a predetermined shape by extrusion molding or hollow molding of a thermoplastic resin, and then the heating fluid passage is formed. If is fixed to the panel, the wiper antifreezing panel can be manufactured more easily and highly accurately.

By incorporating a metal filler in the plastic molded product forming the panel and / or the heating fluid flow path, or the hollow portion has a cross-sectional shape in which the lower side is longer than the upper side and the lower side is the panel. By having a trapezoid facing the surface, or an arc shape in which the strings face the panel, the average wall thickness of the portion of the heating fluid flow path portion in contact with the panel is also defined by sandwiching this portion in contact with the panel and the hollow portion. The heating fluid can heat the panel more effectively by making the thickness smaller than the average thickness of the portions of the heating fluid flow path portion facing each other.

Preferred embodiments of the present invention will be described below with reference to the drawings.

As shown in the schematic plan view of FIG. 1A and the sectional view taken along line BB of FIG. 1B, the wiper antifreezing panel 10 of the present invention is a panel. 12 and a heating fluid channel portion 14 arranged on this panel. The panel 12 is formed of a thermoplastic resin. In addition, the cross-sectional shape of the hollow portion 16 is substantially similar to the cross-sectional shape of the heating fluid channel portion 14, and the average thickness (t1) of the portion 14A of the heating fluid channel portion that contacts the panel 12 is
Average thickness (t2) of the portion 14B of the heating fluid flow path portion that faces the panel-contacting portion 14A with the hollow portion 16 in between.
Thinner than. The cross-sectional shape of the hollow portion 16 is a trapezoid whose lower side is longer than its upper side and whose lower side faces the panel.
The upper side is slightly curved. The bottom side is generally parallel to the panel.

The thermoplastic resins for molding the panel 12 and the heating fluid channel portion 14 may be the same or different, but more preferably, the heating fluid when molding the heating fluid channel portion 14 is used. A thermoplastic resin is selected so that the flow path portion 14 is welded to the panel 12. In the above-described embodiment, various engineering plastics other than the polyamide resin can be used as the raw material of the panel 12 and the heating fluid flow path portion 14. In the above-described embodiment, the panel 12 and the heating fluid channel portion 14 are integrally formed.

For example, engine cooling water, which is hot water after cooling the engine, is used as a heating fluid, and the heating fluid is introduced from the heating fluid inlet port 18A formed in the heating fluid passage portion 14 into the heating fluid passage portion 14. And discharge from the heated fluid outlet 18B. The heating fluid flowing out from the heating fluid channel 54 is
Returned to the radiator.

As shown in the schematic partial cross-sectional view of FIG. 2A, the wiper antifreezing panel 10 includes the wiper 3
It is attached to the inside of the vehicle at a portion 32 of a glass window formed of, for example, a front window to which 0 is locked. Alternatively,
The wiper antifreezing panel 10 is attached to the glass window portion 32.
It may be attached to the vehicle body or the like facing the above by using an appropriate means. The panel 12 has a width that is narrower than the width of the glass window portion 32. When the portion of the glass window is curved, the panel 12 may have a similar curvature, but may have a flat plate shape. This is because if the panel 12 is flexible, it can be easily bent according to the curvature of the glass window portion. In the conventional wiper anti-freezing panel composed of a metal plate and a metal pipe, the distance between the heating fluid passage and the glass window is usually required to be about 2.6 mm due to the processing accuracy of the wiper anti-freezing panel. However, in the wiper anti-freezing panel of the present invention, this distance can be further shortened. In FIG. 2, reference numeral 26 is a dashboard. FIG. 2B shows a front view of the vehicle.

The heating fluid flows through the hollow portion 16 of the heating fluid flow path portion 14 to heat the panel 12, and the heat conduction from the panel 12 heats the glass window portion 32. As a result, the glass window portion 32 is heated. It is possible to prevent the wiper 30 locked to the portion 32 from freezing.

The wiper antifreezing panel 10 can be manufactured by the method described below. First, the panel 12 is molded using a known plastic molding technique.
Next, the heating fluid channel portion 14 is integrally formed on the panel 12. Therefore, after the panel 12 is mounted in the molding die cavity, the heating fluid channel portion 14 is formed by the hollow molding method. That is, the molten thermoplastic resin is injected into the mold cavity. Then, after the injection of the molten thermoplastic resin in an amount necessary to form the hollow structure portion is completed, or during the injection of the molten thermoplastic resin, a high-pressure gas is injected into the injected molten thermoplastic resin. As high pressure gas,
A gaseous substance such as nitrogen gas, carbon dioxide gas, air, or helium gas at room temperature can be used, but a gas liquefied under high pressure may also be included. The injection amount of the molten thermoplastic resin may be an injection amount that fills the resin required to form the heating fluid channel portion 14.

By injecting a high pressure gas into the molten thermoplastic resin, a hollow portion 16 through which the heating fluid flows is formed. By cooling and solidifying the molten thermoplastic resin while maintaining the pressure of the high-pressure gas, the heating fluid channel portion 14 formed of the thermoplastic resin is completed. When the molten thermoplastic resin is injected into the cavity, the surface portion of the panel 12 that comes into contact with the molten thermoplastic resin is brought into a molten state by the molten thermoplastic resin. When the molten thermoplastic resin injected into the cavity cools and solidifies, the injected molten thermoplastic resin that should form the heating fluid flow path section is fused with the thermoplastic resin of the panel in the molten state to form an integral body. Become.
If necessary, the end of the hollow portion may be cut into a pipe shape. In this way, the heating fluid channel portion 14 is connected to the panel 1
2 and the heating fluid flow path portion 14 is integrally formed with the panel 12
Placed on top.

In the molding of the heating fluid flow path portion, various factors such as the amount of molten thermoplastic resin, temperature, pressure or injection speed, amount of high pressure gas, pressure or speed, mold cooling time, etc. at the time of injection molding can be used. The condition (1) must be appropriately selected and controlled depending on the type of thermoplastic resin used, the shape of the mold, etc., and cannot be uniquely determined. The cross-sectional shape of the hollow portion also depends on these conditions.

The wiper antifreezing panel can also be formed by the method described below. First, the panel 12 is molded by a known thermoplastic resin injection molding method. The heating fluid flow path section 14 is a molded article having a continuous hollow structure formed by a hollow molding method in which a required amount of molten thermoplastic resin is injected into the mold cavity and then pressurized gas is injected into the molten resin. Then, both ends of this molded product are machined into a required shape. next,
The plate-shaped portion of the panel and the pipe-shaped portion of the heating fluid channel portion may be adhered to each other by heat welding, an adhesive such as an epoxy resin, or may be integrated by meshing.

Although the preferred embodiments have been described above, the present invention is not limited to the above embodiments.

The size of the wiper antifreeze panel 10 depends on the size of the vehicle to be mounted. The wiper anti-freezing panel can be applied not only to the anti-freezing of the wiper for the front window but also to the anti-freezing of the wiper for the rear window if necessary. Examples of the vehicle include various automobiles such as passenger cars, trucks and buses, snow vehicles, snow plows and the like.

The shape of the heating fluid channel portion 14, the hollow portion 16
The cross-sectional shape depends on the size of the wiper anti-freezing panel, the required heat radiation amount, and the like. For example, various shapes of the heating fluid channel portion 14 are illustrated in FIG. It is also possible to arrange a plurality of heating fluid flow passages 14 on the panel 12 and connect the open ends of the heating fluid flow passages 14 with suitable pipes 20.
The shapes of the heating fluid inlet 18A and the heating fluid outlet 18B formed in the heating fluid channel portion 14 can be appropriately changed. As the heating fluid, not only the engine cooling water but also the coolant for the wiper anti-freezing panel can be used. In this case, the coolant may be circulated in the hollow portion of the heating fluid channel portion of the panel by using an appropriate pump or the like.

As shown in the partial sectional view of FIG.
In order to improve the efficiency of heat radiation, a metal foil 22 such as an aluminum foil having a thickness of about 0.1 to 0.2 mm, and a glass window when the glass window is in contact with the surface of the glass window facing the second glass window. A protective film or protective coating layer 24 for protecting the above can be laminated by using or applying an adhesive, for example.

The thermoplastic resin which is the raw material for the panel 12 and the heating fluid flow path portion 14 may be appropriately selected according to the characteristics required for the wiper anti-freezing panel.

[0035]

The wiper anti-freezing panel of the present invention comprises:
Since it is molded using a thermoplastic resin, it can be easily manufactured with high processing accuracy and at low cost, can be easily mounted on a window or the like, and is lightweight. Since the processing accuracy is high, the gap between the wiper anti-freezing panel and the glass window can be reduced, and the glass window of the wiper anti-freezing panel can be heated more efficiently.

Further, since the wiper anti-freezing panel of the present invention is formed by using the thermoplastic resin, it has a proper heat retaining effect and a heat insulating effect, and further, a proper heat conduction and a large flow rate of the heating fluid. Therefore, a large temperature distribution is unlikely to occur on the panel. Furthermore, rust does not occur in the heating fluid flow path portion.

If the heating fluid channel portion is formed integrally with the panel, or alternatively, the heating fluid channel portion is molded into a predetermined shape by extrusion molding or hollow molding of a thermoplastic resin, and then the heating fluid channel portion is formed. If is fixed to the panel, the wiper antifreezing panel can be manufactured more easily and highly accurately.

By incorporating a metal filler in the thermoplastic resin composition used for molding the panel and / or the heating fluid flow path portion, or the hollow portion has a cross-sectional shape in which the length of the lower side is longer than that of the upper side, and By forming the trapezoid whose lower side faces the panel or the bow whose chord faces the panel, the average wall thickness of the portion of the heating fluid flow path portion which comes into contact with the panel is also made hollow with this portion which comes into contact with the panel. The heating fluid can heat the panel more effectively by making the thickness smaller than the average thickness of the portions of the heating fluid flow path portion that face each other with the portion sandwiched therebetween.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of a wiper freeze prevention panel of the present invention.

FIG. 2 is a schematic partial cross-sectional view showing an arrangement of a wiper anti-freezing panel of the present invention in a vehicle.

FIG. 3 is a view showing a shape different from that of FIG. 1 of the heating fluid flow path section of the wiper freeze prevention panel of the present invention.

FIG. 4 is a view showing a cross-sectional shape of a heating fluid flow path portion of the wiper freeze prevention panel of the present invention.

FIG. 5 is a sectional view showing still another embodiment of the wiper anti-freezing panel of the present invention.

FIG. 6 is a view showing an example of a conventional wiper freeze prevention panel.

[Explanation of symbols]

 10 wiper antifreeze panel 12 panel 14 heating fluid flow passage portion 14A portion of heating fluid flow passage portion in contact with panel 12 14B portion of heating fluid flow passage portion facing portion 14A 16 hollow portion 18A heating fluid inlet 18B heating fluid Outlet 20 Pipe 22 Metal foil 24 Protective film or protective coating layer 30 Wiper 32 Glass window part 50 Wiper antifreeze panel 52 Panel 54 Heating fluid flow path part 56 Wiper 58 Glass window part

Claims (6)

[Claims] 1. A wiper anti-freezing panel for a vehicle, which comprises a panel and a heating fluid flow path section arranged on the panel, and which is mounted in a vehicle facing a portion of a glass window where the wiper is locked. The wiper anti-freezing panel, wherein the panel and the heating fluid channel portion having a hollow portion through which the heating fluid flows are integrally molded by injection molding using a thermoplastic resin. 2. A preformed thermoplastic resin panel is mounted in a mold cavity, and the thermoplastic resin is injected into the cavity portion forming the heating fluid flow path portion, hollow molded, and fused to the panel. The wiper anti-freezing panel according to claim 1, which is an integrally molded product. 3. A wiper anti-freezing panel for a vehicle, which comprises a panel and a heating fluid flow path section arranged on the panel, and which is mounted in a vehicle facing a glass window portion where the wiper is locked. The heating fluid channel section is formed by extruding a thermoplastic resin into a predetermined shape by an extrusion molding method or a hollow molding method, and then fixing the heating fluid channel section to the panel made of a thermoplastic resin. A wiper anti-freezing panel. 4. The wiper freeze prevention according to claim 1, wherein the thermoplastic resin molded product forming the panel and / or the heating fluid flow path section contains a metal filler. panel. 5. The cross-sectional shape of the hollow portion is a trapezoid in which the length of the lower side is longer than that of the upper side and the lower side faces the panel, or the chord is an arch shape that faces the panel. The wiper anti-freezing panel according to item 3. 6. The average thickness of the heating fluid channel portion that contacts the panel is smaller than the average thickness of the portion of the heating fluid channel portion that opposes the portion that contacts the panel with a hollow portion in between. The wiper anti-freezing panel according to any one of claims 1 to 3, wherein: