JPH0630439U - Intake valve device - Google Patents

Abstract

(57) [Abstract] [Purpose] The purpose of the present invention is to improve the intake efficiency of fuel gas by improving the structure of the intake valve in order to eliminate the drawbacks of the conventional reed valves. An intake valve device utilizing the crank chamber pressure of a two-cycle engine is characterized in that the intake valve 1 is formed in a box shape having side plates 6 on both sides of two surfaces having a bend.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an intake valve device that utilizes the crank chamber pressure of a two-cycle engine.

[0002]

[Prior art]

 Up to now, the intake valve device is made of an elastic flat plate, and in order to regulate the opening of the intake valve, a curved stopper is fixedly provided on the downstream surface of the valve body, which is a so-called reed valve device. there were. The conventional reed valve has a window frame that supports the reed at the outlet of the intake passage of the reed valve body.The reed consisting of a flat plate has one end fixed to this inclined flat window frame and the other end It makes elastic contact and opens and closes, and the valve seat on the window frame seals it. Further, in order to regulate the opening degree of the reed, a curved topper is fixedly provided on the reed valve body together with the reed. Therefore, when the fuel gas passes through the reed valve body, the window frame at the outlet of the passage obstructs the flow of the fuel gas, and a sufficient opening at high speed cannot be obtained. Especially when two reeds are used facing each other, the flow of fuel gas collides with the center of the inside of the tip of the reed valve body and is disturbed. In addition, since the lead inclination angle is steep, the opening and closing resistance of the lead is large, the crank chamber pressure cannot be sensed sensitively, and the low-speed followability deteriorates. Furthermore, when the fuel gas passes through the intake valve, the reed valve is a flat plate, so it hits the surface and scatters in the lateral direction of the valve. Due to these factors, improvement of inhalation efficiency is hindered.

[0003]

[Problems to be solved by the device]

 The present invention has been made in view of the above points and aims to improve the intake efficiency of fuel gas by improving the structure of the intake valve.

[0004]

In order to achieve the above object, in an intake valve device that utilizes the crank chamber pressure of a two-cycle engine, a box-shaped intake valve 1 having two surfaces on each side of a bent surface. It is formed and provided.

[0005]

[Action]

 With this configuration, the fuel gas that pushes open the intake valve 1 and flows into the crank chamber flows to the free end side along the surface of the intake valve 1 that is obliquely arranged. At this time, since the inclination angle of the intake valve 1 can be made small by providing a bend in the downstream portion of the intake valve 1, the crank chamber pressure can be sensed more sensitively, and particularly the low-speed follow-up property is improved. Further, at high speed, the intake resistance can be reduced by making the outlet window 3 of the valve body 2 large. Especially when two intake valves 1 are used facing each other, by making the center of the valve body 2 into a thin plate shape parallel to the flow of fuel gas, it is possible to make the window frame as a passage extremely wide. A gas rectifying action is also produced. Furthermore, since the fuel gas hits the bent portion on the downstream side of the intake valve 1 more strongly, the opening degree of the intake valve 1 can be easily increased, and the flow of the fuel gas is converged and the intake valve 1 It is guided by the side plate 6 into the crank chamber without leaking laterally. Therefore, the intake efficiency is increased and the engine output is improved.

[0006]

【Example】

 An embodiment of the present invention will be described below. FIG. 1 is a perspective view of the product of the present invention, in which an intake valve 1 is attached to a valve body 2 together with a stopper 4 with a fixing screw 5. Further, intake valves 1 are provided above and below the valve body 3. In FIG. 1, the intake valve 1 has an obtuse angle bend at the downstream side of the fuel gas flow, has triangular surfaces on both sides, and has a seal width at the tip to allow fuel gas flow. Provide a fold parallel to. FIG. 2 shows the valve body 2, and the shape of the valve body 2 provided with the outlet window 3 conforms to the shape of the intake valve 1 so as to be inside. Further, the center of the tip of the valve body 2 is formed into a thin plate shape parallel to the flow of fuel gas. Further, the surface of the portion of the intake valve 1 that comes into elastic contact with the seal width is coated with rubber. FIG. 3 is a conventional reed valve, and FIG. 4 is a partially longitudinal front view of the intake valve 1 according to the embodiment of the present invention during operation. In Fig. 3, when the engine is sucked in, the fuel gas that flows in by pushing and opening the reed valve flows along the reed valve diagonally arranged, and leaks to both sides immediately after passing through the outlet window 3. However, by the side plate 6 provided on the side surface of the intake valve 1 of the present invention shown in FIG. 4, it flows straightly, is focused, and is introduced into the crank chamber. In particular, when the opening degree of the intake valve 1 is small, the intake valve 1 covers the valve body 2, and the effect is great. FIG. 4 is a front view of the valve body of the present invention viewed from the upstream inlet side of fuel gas, and FIG. 5 is a front view of the valve body of the conventional product viewed from the upstream inlet side of fuel gas. It is shown. Comparing the two, the difference between the resistance of the fuel gas passage and the opening area can be seen clearly. In this embodiment, two surfaces having obtuse angles are formed, but a single curved surface may be used. Alternatively, an integrally molded product including the side plate 6 may be used.

[0007]

[Effect of device]

 (A) Since the intake air is not disturbed inside the valve body and the opening area of the outlet window can be widened, the intake efficiency is increased. (B) Since the inclination angle at the base of the intake valve can be made small, the crank chamber pressure can be sensed more sensitively, and especially the low-speed followability is improved. The results shown above have the effect of improving the engine output. Therefore, fuel efficiency is also improved.

[Brief description of drawings]

FIG. 1 is an assembled perspective view of the present invention.

FIG. 2 is a perspective view of the valve body 2 of the present invention.

FIG. 3 is a partially longitudinal front view of a conventional reed valve during operation.

FIG. 4 is a partially longitudinal front view of the intake valve according to the embodiment of the present invention during operation.

FIG. 5 is a front view of the valve body of the present invention as viewed from the upstream inlet side of fuel gas.

FIG. 6 is a front view of a conventional valve body as seen from the upstream inlet side of fuel gas.

FIG. 7 is a side view in which a conventional reed valve is partially cut away.

[Explanation of symbols]

 1 intake valve 2 valve body 3 outlet window 4 stopper 5 fixing screw 6 side plate

Claims (1)

[Scope of utility model registration request] 1. An intake valve device using the crank chamber pressure of a two-cycle engine, characterized in that the intake valve 1 is formed in a box shape having side plates 6 on both sides of two faces having a bend. Intake valve device.