JPS6139149Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a reed valve used in a secondary air supply system of an exhaust gas purification device for an internal combustion engine, an intake system of a two-stroke engine, and the like.

A reed made of an elastic thin plate is attached to one side of a valve body with a flow hole in the secondary air supply device used as an exhaust gas purification means of an internal combustion engine or in the intake system of a two-stroke engine. A lead designed to allow fluid on the high pressure side to flow to the low pressure side when the fluid pressure on the opposite side is higher than the fluid pressure of the adhesive, and to block fluid flow when the pressure contrast is opposite to the above. Many valves are used. Figure 1 shows the general structure of this type of reed valve disclosed in Utility Model Application Publication No. 56-70266 and others. A lead 5 made of a thin plate material is attached, and one end is fastened to the valve body 1 with a tightening screw 7, and the free end side is brought into contact with and separated from the surface of the valve body 1 to close or close the flow hole 2. It is configured to open. Valve body 1
A valve seat 3 is baked with a rubber-like elastic material around the communication hole 2, which completely blocks the reed 5 and functions to buffer the impact of the reed 5 against the valve body 1 when the valve is closed. A stopper 10 formed by bending a plate material of an appropriate thickness is placed on the back of the lead 5, and is fastened together with the lead 5 by a tightening screw 7 to prevent bending deformation of the lead 3 when the valve is opened. This serves to prevent the lead from being damaged due to excessive bending deformation. The stopper 10 is required to have the strength to withstand the pressing force due to the fluid pressure acting on the reed 3 during the valve opening operation and the inertia force of the reed 3 during the valve opening operation, and to not resonate with the vibration of the reed. thickness and weight.

The present invention aims to reduce the weight of the stopper, and its gist is that the stopper is formed by a main body that supports the reed when the valve reaches its maximum open state, and side ribs that extend integrally from the side edges of the main body. This strengthens the strength of the stopper as a cantilever. The thickness of the side ribs is made equal to the thickness of the main body part for convenience in manufacturing, or the height dimension is made higher on the fixed end side where the stopper is a cantilever, and higher on the free end side. It is formed by gradually decreasing towards the end.

Since the reed valve according to the present invention has the above-described configuration, the following effects are brought about.

Because the stopper has side ribs that extend integrally from the side edges of the main body that supports the lead, the moment of inertia of the cantilevered stopper becomes large even if the stopper is thin.
The load capacity for bending loads is enhanced.

During bending of the stopper, the ribs formed on the sides act to restrain the bending deformation of the main body, thereby preventing springback of the main body and maintaining high bending accuracy.

The ribs formed on the sides of the stopper as a cantilever beam avoid resonance with the vibration of the reed that occurs due to the thinness of the stopper, and prevent damage to the stopper due to the resonance.

Embodiments of the present invention will be described below with reference to the drawings. In the embodiments shown in FIGS. 2 and 3, a stopper 10 is overlapped with the lead 5 and extends along the lead 5 from the fixed end portion fastened to the valve body 1 by the tightening screw 7, and extends to the maximum valve opening. A main body part 11 that supports the lead 5 at the time, a side rib 12 extending from the side edge of the main body part 11 in a direction substantially perpendicular to the main body part 11, and a main body part 11 from the fixed side edge.
It has a rear rib 13 extending substantially perpendicularly thereto and connecting the ribs 12 on both sides. The height of the side ribs 12 from the main body 11 gradually decreases from the fixed end side to the free end side, and the rear rib 13 is formed slightly lower than the height of the rear end of the side rib 12. ing.

Another embodiment shown in FIGS. 4 and 5 shows the structure of a stopper in a reed valve having two reeds connected to each other, and has side ribs on the outer edges of each main body 11, 11. 12,1
2 is attached, and a rear rib 13 is attached to the fixed end edge.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a reed valve according to the prior art, FIG. 2 is a sectional view of an embodiment of the reed valve according to the present invention, and FIG. 3 is a plan view of the embodiment of FIG.
FIG. 4 is a plan view of another embodiment of the stopper for a reed valve according to the present invention, and FIG. 5 is an arrow V shown in FIG. 4.
It is a sectional view shown with -V. 1... Valve body, 2... Communication hole, 3... Seat, 5... Lead, 7... Tightening screw, 10... Stopper, 11... Main body, 12... Side rib, 1
3...Backward rib.

Claims (1)

[Scope of utility model registration request] A valve body 1 having a communication hole 2, a reed 5 made of an elastic plate and attached to the side of the valve body 1 to open and close the communication hole 2, and a reed 5 attached to the back of the reed 5 to open and close the valve. A stopper 10 is provided to prevent excessive warping and deformation of the lead 5 during operation, and the stopper 10 is made of a plate material and has a rib 12 on at least the side edge of the main body 11 from the fixed end side to the free end side. Reed valve provided.