JPS6339128Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a switching valve used for switching air passages in an automotive air conditioning system.

Prior Art In the past, switching valves such as those described above were supported using metal bushings by connecting metal plates, rods, etc. with screws, but in recent years, with the development of synthetic resins, This has led to a reduction in the number of parts, assembly man-hours, and noise reduction. For example, Jitsukō 49-35066, Jitsukō 51
-24569 has already disclosed the use of synthetic resins.
Examples of concrete structures currently in use made of synthetic resin include those shown in FIGS. 3 and 4. In FIG. 3, the valve plate 2 has a shaft 4;
An axial hole is drilled at both ends. A bush 20 and an operating lever 10 for supporting and operating the valve plate are opposed to each other and are snap-fitted to the case 1 using a claw 12 or the like. The bush 20 and the shaft of the operating lever 10 extend axially into the hole in the shaft of the valve plate and support the valve body. Alternatively, as shown in Fig. 4, instead of providing a hole in the shaft of the valve body, the shaft may be extended outward and the extensions 5 and 8 supported by a hole provided in the case and an operating lever. are doing. In addition, the conventional snack fighter used in the examples shown in Figs. 3 and 4 has a fifth
As shown in Figures A and 5B, a pawl 12 is provided over almost the entire circumference of the bush, lever, etc., and is divided into two by two axial slits, making it flexible in the radial direction.

Problems to be Solved by the Invention However, such conventional technology has the drawback that it requires a large number of parts, such as the bush 20 required in the example shown in FIG. 3, and is difficult to assemble. Further, in the example shown in FIG. 4, after the valve plate is brought into the case, it is necessary to move the extension portion 5 to engage with the hole in the case wall, so that the gap between the valve plate and the inner surface of the case is reduced. necessarily become larger. Furthermore, the conventional snap-fit with the structure shown in Fig. 5, which is used in Figs. 3 and 4, has no problem with the function of fixing the pushbutton and operating lever against the wall so that they do not move in the axial direction. If forces perpendicular to the axis are applied from the wall to the bushing or operating lever, these forces can be absorbed by the flexible claw 12.
This is not desirable in terms of strength and rigidity. The present invention aims to overcome the drawbacks of the conventional switching valves as described above.

Means for Solving the Problems In order to solve the above technical problem, in the present invention, one end of the shaft 4 of the valve plate is made to protrude outward from the plate part of the valve plate so as to engage with the hole in the case 1. A hole is provided at the other end of the shaft 4, and the shaft 4 is engaged with the shaft 11 of the operating lever 10. The operating lever 10 is snap-fitted to the wall of the case 1, and the pawl 12 is divided into three or more pieces when viewed in the circumferential direction, and each divided pawl has an outer diameter that fits into the inner diameter of a hole in the wall. A solid portion 13 is arranged.

Effect of the invention This invention has the following unique effects.

Few parts.

The gap between the valve body and the case is small.

The snap-fit portion of the operating lever has sufficient rigidity and strength against lateral loads.

Embodiment FIG. 1 shows an embodiment of the present invention, in which a valve body 2 for controlling airflow is placed inside a case 1 and can be operated from outside the case via an operating lever 10. The case 1 is made of a resin material such as polypropylene, has a valve body 2 attached thereto, and defines an air flow path 20. The valve body 2 is also made of a resin material such as polypropylene, and a plate portion 3 having an area large enough to cover the air flow path 20 and a shaft 4 for mounting the valve body are integrally molded. One end of the shaft 4 is extended outward from the plate part 3 to form an extension part 5, which is fitted into a corresponding hole provided in the case 1 and is rotatably supported. The other end of the shaft 4 extends to the side edge of the plate portion 3, has a large outer diameter, and has an axial hole 7.
is provided. The operating lever 10 is made of a highly elastic resin material such as polyacetal, and includes an arm 14 to which operating force is applied from the outside, neck portions 12 and 13 that engage with corresponding holes provided in the case 1, and a hole in the valve body. 7 and a shaft portion 11 that engages with the shaft portion 7 . As shown in FIG. 2C, the bottom of the hole 7 and the tip of the shaft 11 both have non-circular cross sections and engage with each other, so that torque about the axis can be transmitted. In addition, cantilever beam-shaped claws 12 as shown in FIG. 1 are arranged on the neck and divided into three in the circumferential direction as shown in FIG. 2A. There is also a solid portion 13 divided into three parts, and the solid portion has an outer diameter that rotatably fits into a hole in the case. When inserting the operating lever 10 into the hole in the case, use the claw 12.
bends inward, the toe 15 passes through the hole while contacting the inner surface of the hole, and after passing, it expands outward again due to the elasticity of the pawl 12, the toe 15 engages with the wall surface, and the operating lever 10
to case 1. When a lateral force perpendicular to the axial direction acts on the neck of the operating lever due to wind pressure applied to the valve body 2 or operating force applied to the operating arm 14, these lateral forces are divided into three parts as described above. The pawl 12 is mainly supported by the solid portion 13 and has low rigidity, so that no excessive force is applied to the pawl 12. That is, when the operation lever 10 is mounted on the wall 1, its axial direction is restrained by the claw 12, and the vertical direction to its axis is restrained by the solid part 1.
By having each person divide the work according to 3,
The load on the claw 12, which is relatively easily damaged, is reduced,
Its lifespan can be extended. When assembling the entire valve, first put the valve plate 2 into the case 1, and insert the shaft extension 5 of the valve plate 2 into the receiving part 9 provided at the bottom of the case.
position it above. Next, the operating lever 10 is inserted into the hole of the case 1, and at the same time, the relative angular position is determined so that the tip of the shaft of the operating lever, which has a non-circular cross section, engages with the bottom of the non-circular cross section of the hole 7 of the valve body 2. When the operating lever is pushed in, the shaft extension 5 of the valve body enters the hole in the wall of the case, and the operating lever is snapped onto the wall of the case, completing the assembly.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the air flow switching valve according to the present invention, and FIGS. 2A, 2B, 2C, and 2D are AA, BB, CC, and D- of FIG. 1.
3 and 4 are cross-sectional views of a conventional air flow switching valve, and FIG. 5A is a cross-sectional view of a conventional snap-fit structure.
FIG. 5B is a sectional view taken along line BB in FIG. 5A. In the figure, 1...case, 2...valve plate, 4...valve plate shaft, 10...operation lever, 12...claw, 13...solid part.

Claims (1)

[Scope of Claim for Utility Model Registration] A switching valve for controlling the flow of gas inside a case, comprising a valve plate that is rotatable relative to the case, and an operating lever that operates and rotates the valve plate from outside the case. The valve plate has a protrusion on one side thereof that protrudes in the direction of the rotation axis of the valve plate, the protrusion is rotatably supported by the case, and the protrusion is rotatably supported by the case, and The other side of the valve plate has a recess that engages with the operating lever, and the operating lever passes through a wall of the case in the direction of the rotational axis of the valve plate and is rotated by the wall. a portion of which extends into and engages a recess in the valve plate for torque transmission about the axis, and is further supported by a wall of the case of the operating lever; The supported cylindrical neck is arranged between three or more claws arranged on the circumference of the cylinder and bendable toward the inside in the radial direction of the cylinder, and between the claws when viewed in the circumferential direction. and a solid portion, wherein the force applied to the operating lever in the direction of the rotation axis is supported by the pawl, and the force in the direction perpendicular to the axis is supported by the solid portion. A switching valve.