JPH0422047Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a control valve device that is installed in an intake system that supplies air or air-fuel mixture to an engine to control the amount of intake air, and is mainly used in the intake system of an automobile engine. used for.

Prior art and its problems It is not possible to install multiple intake passages for each engine cylinder for the purpose of creating a swirl in the combustion chamber of an engine or controlling the amount of intake air according to engine operating conditions. widely known. In order to simultaneously open and close corresponding ones of these intake passages, instead of providing control valves for each and interlocking them with mechanical means such as a link mechanism, a configuration in which multiple valve bodies are attached to a single valve shaft is used. Efforts are being made to simplify the locking mechanism.

Figure 3 shows two air intake passages 1 and 2 arranged in parallel.
A valve shaft 6 in which disc-shaped valve bodies 3 and 4 that open and close pass through a body (or throttle body) 5 of the intake system.
This shows a conventional example installed in
The valve stem 6 is rotatably supported by bearings 7, 7 made of ball bearings on both outer walls 5a, 5a of the body 5, and is supported in the air intake passages 1, 2 of the body 5.
It is rotatably supported by a bearing part 8 made of a sliding bearing at an intermediate wall part 5b that partitions the two parts.

In this configuration, the inner diameter D2 of the three bearing parts 7, 7, ₈ with respect to the shaft diameter _D1 of the valve shaft 6 is set to a diameter that provides the minimum necessary clearance, and the intermediate bearing part 8 is set at both ends. Same inner diameter as the bearing part 7, 7 of the part D ₂
It is processed into Therefore, when the valve bodies 3 and 4 receive negative intake pressure from the engine and the valve stem 6 bends, the middle portion that bends the most strongly contacts the bearing part 8, causing wear and instability of the opening/closing force. . As a countermeasure, the load on the valve closing spring has been increased, but this has resulted in the problem that a large valve opening force is required.

Purpose of the invention This invention solves the above-mentioned problems of a control valve device in which a plurality of valve bodies for opening and closing each of a plurality of intake passages are attached to a single valve shaft that is rotatably supported in a body. To solve this problem, we provide a control valve device that does not require a large opening/closing force, and does not cause the valve stem to come into strong contact with the bearing in the area between the intake passages, causing wear and instability of the opening/closing force. It is intended to.

Structure of the invention In order to achieve the above-mentioned object, the present invention is based on the size of the gap between the valve shaft and the bearing provided on the intermediate wall that partitions the intake passage of the fuselage, based on the maximum amount of deflection of the valve shaft due to negative suction pressure. It is characterized by the above.

Embodiment An embodiment of the present invention will be described based on the drawings. In FIGS. 1 and 2, a disc-shaped valve body 1 opens and closes two intake passages 11 and 12 arranged in parallel.
3 and 14 are attached to a single valve shaft 16 that passes through the body 15 of the intake system. Therefore, it is rotatably supported, and the intake passage 11 of the fuselage 15,
It is rotatably supported by a bearing part 18 made of a sliding bearing at an intermediate wall part 15b that partitions the two parts.

The embodiment of FIG. 1 has three bearing parts 17, 17, 1.
It is the same as the conventional product in that the inner diameter D ₂ of the valve stem 16 is selected to provide the minimum necessary clearance with respect to the shaft diameter D ₁ of the valve stem 16, but A notch 19 is formed in the portion where the valve shaft 16 is bent, so that the size of the gap between the valve shaft 16 and the bearing portion 18 is made larger than the maximum amount of deflection of the valve shaft 16 due to negative suction pressure. still,
Instead of the cutout portion 19, a shallow annular groove may be provided to form the small diameter portion.

In the embodiment shown in FIG. 2, the diameter D ₃ of the shaft hole 20 formed through the body 15 is set to a diameter that provides a gap greater than the maximum deflection amount of the valve shaft 16 with respect to the shaft diameter D ₁ of the valve shaft 16. The inner diameter D ₂ of the bearing parts 17, 17 is the valve shaft 1.
The inner peripheral surface of _the shaft hole 20 passing through the intermediate wall portion 15b directly forms a sliding bearing.

In addition, even when one valve stem is arranged for three or more intake passages, the size of the gap between the valve stem and the bearing provided on the intermediate wall that partitions each intake passage must be determined. Of course, the amount of deflection must be greater than the maximum amount of deflection of the valve stem due to negative suction pressure.

Effects of the invention According to the invention, the maximum amount of deflection of the valve stem due to negative suction pressure is reduced by reducing the gap between the bearing part of the intermediate wall part that supports the part where the valve stem is deflected the most due to negative suction pressure of the engine, and the valve stem. As a result, the valve stem does not come into contact with the bearing even when the high suction negative pressure occurs when the engine is idling or decelerating, which prevents wear of the valve stem and bearing and instability of the opening/closing force. Therefore, it is possible to use a valve closing spring with a small load, and the valve can be operated with a small opening force.

[Brief explanation of the drawing]

1 and 2 are longitudinal sectional views of different embodiments of the present invention, and FIG. 3 is a longitudinal sectional view of a conventional example. 11, 12... Intake path, 13, 14... Valve body,
15...Body, 15b...Intermediate wall portion, 16...Valve shaft, 18...Bearing portion.

Claims (1)

[Scope of utility model registration request] In an engine intake air amount control valve device in which a plurality of valve bodies for opening and closing each of a plurality of intake passages are attached to a single valve shaft rotatably supported in a body, an intermediate wall portion that partitions the intake passages of the body. A control valve device in which the size of the gap between the bearing part provided in the valve shaft and the valve shaft is greater than or equal to the maximum amount of deflection of the valve shaft due to suction negative pressure.