JPS6233100Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a heating/cooling switching device for an air cleaner equipped with an intake air temperature control device installed in an automobile engine.

As part of specific measures to comply with exhaust gas regulations, an air cleaner equipped with an intake air temperature control device that dilutes the air-fuel mixture to reduce CO and HC, prevents icing in cold weather, and improves warm-up performance has been put into production. It is shown in Publication No. 1974-94006. This intake control valve will be explained with reference to FIG. 3. It is attached to the intake pipe as follows. The intake control valve, which is slightly smaller than the width of the intake pipe, is provided with semicircular bulges facing vertically at the approximate center thereof, and a shaft is passed through the bulges to make the intake control valve rotatable. It is inserted into bearings in openings provided on both side walls of the intake pipe. When the intake air temperature is low, the bimetal 9 of the temperature sensor 10 is displaced upward, and the valve 11 connected to the bimetal 9 closes the opening of the temperature sensor chamber 12, and the suction negative pressure generated in the intake manifold is transferred to the vacuum motor 13. The diaphragm is pulled up against the spring, and the spindle 14 connected to the diaphragm is moved upward, thereby interlocking the intake air temperature control valves 1 and 1', closing the intake pipe 8, and opening the warm air pipe. 15 is opened and warm air 15 is inhaled. When the intake air temperature rises, the bimetal 9 of the temperature sensor 10 moves downward, the valve 11 opens, and the temperature sensor chamber 12 communicates with the atmosphere, so the inside of the vacuum motor 13 becomes atmospheric pressure, and the spindle 14 also moves downward to adjust the intake air. The valves 1 and 1' become horizontal, allowing cold air 8 to flow in from the intake pipe 8, and the warm air pipe 15 is closed, reducing the temperature of the intake air. In this way, the intake air temperature and the intake negative pressure displace the intake air regulating valves 1 and 1', thereby adjusting the intake air temperature.

The intake control valve moves left and right on its shaft due to vehicle body vibrations, engine vibrations, and rotation to mix hot and cold air, causing the outer edge of the control valve and the intake pipe to come into contact and damage each other over a long period of time. It ends up. By the way, in rural areas and coastal areas where rock salt is sprayed on roads to prevent road surfaces from freezing due to snowfall, rust tends to form due to the salt, and the outer edges of damaged intake control valves will soon rust as well as damaged intake pipes. Particularly when the engine is stopped, rust grows in the gap between the intake pipe and intake control valve as they remain in contact with each other, impeding the rotation of the intake control valve. This has the disadvantage that the intake control valve becomes stuck and becomes unable to rotate.

The present invention provides a cooling/heating air switching device that eliminates these drawbacks. A shaft made of stainless steel is passed through the semicylindrical bulge provided on the intake control valve, and the shaft is inserted into the opening of the intake pipe from the inside. It is inserted into the hollow part of a hollow cylindrical patch plate made of stainless steel with one end expanded, and the patch plate prevents contact between the intake control valve and the intake pipe. Even when rust occurs, the valve can be rotated to mix hot and cold air.

Figures 1 and 2 show an embodiment of the present invention, in which an intake pipe 8 for taking in air is provided on the side wall of a cylindrical housing housing an element, a pipe for taking in warm air is provided in the intake pipe, and a branch path is provided for cooling and heating. An intake control valve 1 for switching air is provided. Intake pipe 8
Openings are provided in both walls of the intake pipe 8, and a hollow cylindrical patch plate 7 made of rust-resistant steel with an enlarged end is inserted into the opening and fixed so that the enlarged part is located inside the intake pipe 8. . In addition, semicircular bulges 2 and 3 are vertically bulged out alternately in a semicylindrical shape on the flat intake control valve 1, and a shaft made of stainless steel is inserted into the through hole 4 formed by the bulges 2 and 3. 6 to make the intake control valve 1 rotatable. Then, both ends of the shaft 6 are inserted into the hollow portion of the patch plate 7, and the shaft 6 and the patch plate 7 are fixed.

Depending on the temperature of the air taken in by the air cleaner, an intake control valve 1 connected to a vacuum motor (not shown) rotates to open and close the intake pipe 1 and the warm air pipe to maintain an appropriate temperature. Due to vibrations, rotation for mixing hot and cold air, etc., the intake control valve 1 moves on the shaft 6 and comes into contact with the expanded part of the patch plate 7 at the outer edge 5, causing damage. There is no contact due to the gap corresponding to the wall thickness. Even if the outer edge 5 of the intake air control valve 1 becomes rusty due to salt, it will not stick to the metal it comes into contact with and will rotate. Intake pipe 8
There is no contact with the intake control valve 1, so there is no damage, and the occurrence of rust is delayed.

As described above, in the present invention, the shaft on which the warm air control valve is rotatably mounted and the patch plate that supports the shaft in the intake pipe are made of stainless steel, and the expanded part of the patch plate is fixed to the inside of the intake pipe. Even if the intake control valve moves along the axis within the intake pipe, the expanded portion of the patch plate breaks contact between the outer edge of the intake control valve and the intake pipe, and the intake pipe is not damaged. Even if rust occurs on the outer edge of the intake control valve,
The contacting patch plate is made of stainless steel,
Since no rust occurs, the intake control valve can be rotated without sticking due to rust, and switching between cooling and heating can always be performed normally.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional plan view of an intake pipe according to the present invention, FIG. 2 is a perspective view of an intake air regulating valve, and FIG. 3 is a sectional view of an air cleaner equipped with an automatic intake air temperature regulating device. Further, FIG. 4 is a plan view showing the assembled state of a conventional intake control valve. 1... Intake control valve, 2, 3... Swelling part, 4...
...through hole, 5...outer edge of intake control valve, 6...shaft,
7...Patch plate, 8...Intake pipe.

Claims (1)

[Scope of utility model registration request] A hot air pipe communicating with a hot air source is provided in the intake pipe of the air cleaner, openings are provided on both side walls of the intake pipe, and a hollow cylindrical patch plate made of stainless steel and having an expanded portion at one end is attached to the opening. The shaft is inserted into the through-hole of the intake control valve, which has a through-hole formed by vertically bulging alternating semicylindrical bulges on the shaft made of stainless steel. At the same time, both ends of the shaft are inserted into the hollow part of the patch plate, and an intake control valve is rotatably attached.