JPH0241325Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an intake system device for an internal combustion engine, and more specifically, to an improvement in an operating valve attached to the device.

[Conventional technology]

BACKGROUND ART Conventionally, in an internal combustion engine, an operating valve that controls the flow rate of gas flowing through the flow path has been installed in a flow path provided in an intake manifold that distributes air-fuel mixture from a carburetor to each cylinder. FIGS. 5 and 6 show an example of this operating valve according to the prior art.
The operating valve is attached to. That is, a rotatable shaft 3 is pivotally attached to approximately the center of the flow path 2, and a plate 4 whose front face (direction of arrow A) is elliptical is fixed to the shaft 3. A hole 5 indicated by a broken line in the figure is opened, and a lead 6 made of a flexible material is made to open and close the hole 5.
is secured with screw 7.

[Problems that this invention attempts to solve]

The operating valve described above adjusts the gas flow rate by changing the opening cross-sectional area of the flow path 2 by rotating the shaft 3. In the low rotation range of the internal combustion engine, the plate 4 controls the flow path 2. Close, just lead 6
opens to allow only a small amount of gas to flow from the hole 5, and in the high rotation range, the plate 4 itself opens to allow a large amount of gas to flow; however, in the latter case, when the plate 4 itself rotates open, As shown by the chain line in FIG. 5, the plate 4 is located in the center of the flow path 2, which increases the ventilation resistance. The resistance becomes larger and larger. Further, according to the above-mentioned conventional example, the hole 5 is opened in the plate 4, and the step portion 8 is provided on the wall surface of the flow path 2 so that the peripheral edge of the plate 4 engages with the wall surface of the flow path 2 to reliably close the flow path 2. Therefore, there was a problem in that immediately after the gas passes through the hole 5, there is a possibility that turbulent flow occurs near the stepped portion 8, and the smooth flow of the gas may be obstructed.

[Means for solving problems]

In view of the above points, the purpose of this invention is to lower the ventilation resistance when the plate valve is open, and to prevent turbulence in the gas flow due to the reed valve opening when the plate is closed, and to achieve this purpose. Therefore, the cross-sectional shape of the flow passage opened in the body is formed to be approximately rectangular, and at least a part of the shaft is rotatably installed along one side wall of the flow passage so as to be embedded in the one side wall. The base end of a plate having a U-shape from the front is fixed, and a reed for opening and closing the central recess of the plate is attached to the plate to form an operating valve.

[Effect]

The device of the present invention equipped with an operating valve configured as described above is such that when the internal combustion engine is in a high rotation range and the plate itself opens, the plate is semi-buried on one side of the flow path, as if it were a single-opening door. In this state, the shaft rotates around the shaft attached to the shaft and stops at a position along the one side wall, and because it does not sit in the center of the flow path as in the conventional case, the flow path resistance is reduced by this amount. can be done. In addition, when only the reed is opened with the plate closed, gas passes through the central recess formed in the plate, but the open side of the central part is connected to the side wall of the flow path (one side wall on which the shaft is attached). The opposite side wall) is located so that the gas flows smoothly along the opposite side wall. The side wall does not have a stepped portion as in the conventional example.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

1 and 2, a flow passage 12 having a rectangular cross section is formed in the body 11, and the flow passage 12 has the following features:
A shaft 15 is rotatably installed on one side wall 13 located at the upper side in the figure, in a direction directly to the penetrating direction of the flow path 12 and partially embedded in the one side wall 13. There is. A portion of the circumferential surface of the shaft 15 forms a flat mounting surface, and the base end 17 of the plate 16 is fixed to the mounting surface with screws 20 in such a manner that the base end of the lead 19 is sandwiched therebetween. As shown in FIG. 3, this plate 16 is formed in a U-shape in front with the base end 17 as a connecting part, and has a central recess 18 formed between the left and right sides, and has a rectangular shape in the front. The formed leads 19 are
The central recess 18 is opened and closed. The tip of the plate 16 and the tip of the lead 19 simultaneously contact the side wall 14 of the channel 12 on the opposite side to the one side wall 13. The side wall 14 is formed as a flat surface, and the step portion 8 unlike the conventional example is not formed.

In the intake system device of the present invention equipped with the operating valve configured as described above, when the internal combustion engine is in a high rotation range and a large amount of gas needs to flow, the shaft 16 itself partially connects to one side wall 13 of the flow path 12. The one side wall 13 rotates around a shaft 15 that is embedded in the shaft.
Since the valve opens so that it approaches the side wall 13, especially when the diameter of the shaft 15 is larger than the thickness of the plate 16, a part of the shaft 15 is embedded in the one side wall 13, which reduces ventilation resistance compared to conventional products. Can be lowered. Further, when the internal combustion engine is in a low rotation range and a relatively small amount of gas is flowing, the plate 16 itself remains closed, and the reed 19 opens the central recess 18 of the plate 16, allowing gas to pass through the central recess 18. At this time, the opening side of the central recess 18 has a flow path 1.
2 side walls 14 are located so that the gas flows smoothly along the side walls 14. Said plate 1
6 has reinforcing ribs 21 as shown in FIG.
may be constructed between the left and right side parts.

[Effect of idea]

As explained above, the intake system device for an internal combustion engine of the present invention includes a shaft rotatably installed along one side wall of a flow path having a substantially rectangular cross section so that at least a part of the shaft is embedded in the one side wall; The proximal end of an operating valve is fixed to the shaft, and the valve is opened by moving the plate itself to one side of the flow path. This reduces ventilation resistance, and when the reed valve is opened, the gas passes from the central recess formed in the plate along the side wall of the flow path, allowing the gas to flow smoothly.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an operating valve of an intake system device according to an embodiment of the present invention, Fig. 2 is a view taken in the direction of arrow C in Fig. 1, and Figs. 3 a and b are side and front views of the plate. , Fig. 4 a, b, and c are a side view, plan view, and front view showing a modified example of the plate, Fig. 5 is a sectional view showing an example of a conventional operating valve, and Fig. 6 is a direction B in Fig. 5. It is an arrow view. 11... Body, 12... Channel, 13... One side wall, 14... Side wall, 15... Shaft, 16...
Plate, 17...Proximal end, 18...Central recess, 1
9...lead, 20...bis.

Claims (1)

[Scope of utility model registration request] In an intake system device for an internal combustion engine that is equipped with an operating valve that opens and closes a gas flow path provided in a body and controls the gas flow rate, the gas flow path has a substantially rectangular cross-sectional shape, and one of the gas flow paths is A shaft is rotatably installed along a side wall with at least a portion of the shaft embedded in the one side wall, the base end of a plate having a U-shape in front is fixed to the shaft, and a lead opens and closes a central recess of the plate. An intake system device for an internal combustion engine, characterized in that the operating valve is formed by attaching a.