JPH068737U - Intake control valve device for internal combustion engine - Google Patents

Abstract

(57) [Summary] [Objective] The assembling property of the valve shaft can be improved, the sliding resistance against the rotation of the valve shaft can be adjusted, and the elastic member is manufactured with a rough size. A valve shaft 8 is rotatably inserted into a housing 1 provided with a passage hole 2 so as to cross the passage hole 2. A valve 9 is attached to the valve shaft 8 and an actuator for opening and closing the valve 9 is connected to the valve shaft 8. An elastic member 15 having elasticity that abuts the side surface of the tip end portion of the valve shaft 8 and an adjusting mechanism 17 capable of adjusting the pressing force of the elastic member 15 against the valve shaft 8 are provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an intake control valve device for an internal combustion engine applied to an intake system of an engine, for example.

[0002]

[Prior art]

 A conventional intake control valve device for an internal combustion engine is disclosed in, for example, Japanese Utility Model Laid-Open No. 62-151484. As shown in the cross-sectional view of FIG. 5, the conventional device of this publication has a housing 31 in which a plurality of passage holes 32 to 35 are arranged side by side, and a valve shaft 36 that traverses the passage holes 32 to 35. Bearing holes 37 to 41 are provided, a valve shaft 36 is rotatably inserted in the shaft receiving holes 37 to 41, and valves 42 to 45 for opening and closing the passage holes 32 to 35 are attached to the valve shaft 36, respectively. A sealing material 46 that seals the gap between the valve shaft 36 and the bearing hole 36 is brought into close contact with one end of the valve shaft 36, and a handle 47 that communicates with a drive source is provided at one end of the valve shaft 36. is there. Further, between the other end of the valve shaft 36 and the bearing holes 40 and 41 of the housing 31, the shaft 36 and the bearing hole supporting the shaft 36 are supported by the vibration and pulsation of the tip portion of the valve shaft 36. O-rings 48 and 49 are provided to prevent the shocking sound of the shaft generated between them.

[0003]

[Problems to be solved by the device]

 In the conventional apparatus, when the valve shaft 36 is inserted into the housing 31, sliding resistance is generated by the O-rings 48 and 49 attached to the tip end of the shaft 36, so that the valve shaft 36 is not easily assembled. Further, since the O-rings 48 and 49 make elastic contact with the valve shaft 36 over the entire circumference thereof, the sliding resistance against the rotation of the valve shaft 36 greatly changes due to the dimensional error of the diameter. For this reason, it is necessary to precisely manufacture the elastic member, and since it is not possible to adjust the sliding resistance, it is difficult to obtain an appropriate sliding resistance.

Therefore, the present invention has been made to solve the above-mentioned problems, and its purpose is to improve the assemblability of the valve shaft and to adjust the sliding resistance against the rotation of the valve shaft. Another object of the present invention is to provide an intake control valve device for an internal combustion engine, which allows the elastic member to be manufactured with a rough size.

[0005]

[Means for Solving the Problems]

 In the intake control valve device for an internal combustion engine of the present invention which solves the above-mentioned problems, a passage hole communicating with the intake passage of the internal combustion engine is provided in the housing, and the valve shaft is rotated in the housing so as to traverse the passage hole. An intake control valve device for an internal combustion engine, which is inserted through the valve shaft so that a valve for opening and closing the passage hole is attached to the valve shaft, and an actuator for opening and closing the valve is connected to a base end portion of the valve shaft. In the above, an elastic member having elasticity that abuts on the side surface of the tip end portion of the valve shaft and an adjusting mechanism capable of adjusting the pressing force of the elastic member against the valve shaft are provided. Further, it is preferable that the elastic member is arranged on a straight line which is orthogonal to the axis of the valve shaft and is substantially parallel to the axis of the valve (a straight line passing through both open ends of the valve) when fully opened.

[0006]

[Action]

 According to the above means, the elastic member comes into contact with the tip of the valve shaft with a pressing force, so that the vibration of the tip of the valve shaft is prevented, whereby the gap between the valve shaft and the bearing hole that supports it is prevented. Shaft striking sound generated in the is reduced. Further, by assembling the elastic member and the adjusting mechanism after inserting the valve shaft into the housing, the valve shaft can be inserted into the passage hole of the housing without sliding resistance. Further, by adjusting the pressing force of the elastic member against the valve shaft by the adjusting mechanism, the sliding resistance against the rotation of the valve shaft of the elastic member is adjusted. If the elastic member is arranged on a straight line that is orthogonal to the axis of the valve shaft and is substantially parallel to the axis of the valve when fully open, the valve shaft vibration due to intake pulsation when the valve is closed and close to it Can be effectively absorbed by the elasticity of the elastic member.

[0007]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. 1 and 2 in which an intake control valve device for an internal combustion engine is shown, the left and right housings 1 having a two-divided configuration are connected to each other at the center thereof. The left housing 1 has one passage hole 2 and the right housing 1 has two passage holes 2 on the left and right. Although not shown, these passage holes 2 communicate with an intake passage of the engine so as to form a part of the passage. A bearing hole 4 is formed in the housing 1 so as to cross the passage hole 2. The bearing holes 4 located at the outer end of each housing 1 are formed in a bottomed shape, and the other bearing holes 4 are formed in a penetrating shape. Before coupling the two housings 1, a valve shaft 8 is rotatably inserted in the bearing holes 4 so as to cross the passage hole 2 with a slight clearance. Valves 9 for opening and closing the passage holes 2 by rotating the shaft 8 are attached to the valve shaft 8. An interlocking lever 11 that connects an actuator 21 to be described later is attached to a base end portion (left end portion in the drawing) of one (right side in the drawing) valve shaft 8.

Opposing ends of the left and right valve shafts 8 are connected by a connector 19. An actuator 21 is attached to the housing 1 via a bracket 20 as shown in FIG. 3, and an operating rod 22 of the actuator 21 is connected to the interlocking lever 11 by a pin 23. Therefore, when the valve shaft 8 is rotated via the interlocking lever 11 by the operation of the actuator 21, the valve 9 opens and closes the passage hole 2. The actuator 21 may be a diaphragm type that uses negative intake pressure, a stepping motor, a DC motor, or the like. The bracket 20 is also used as a connecting member for both housings 1. Further, as shown in FIG. 1, a seal mounting hole 5 is formed at the opening end of the bearing hole 4 on the coupling side of the housing 1. A ring-shaped oil seal 12 as a sealing material is fitted in the seal mounting hole 5. The inner peripheral surface of the oil seal 12 is in contact with the outer periphery of the valve shaft 8 with its elasticity.

A mounting hole 14 is formed in the housing 1 so as to be orthogonal to the bottomed bearing hole 4. As shown in FIG. 4, a cylindrical elastic member 15 made of hard rubber is inserted into the mounting hole 14, and then an adjusting screw 17 is screwed into the mounting hole 14. Therefore, the elastic member 15 is in contact with the outer surface of the distal end of the valve shaft 8 by its elastic force. The small-diameter shaft 17a protruding from the tip of the adjusting screw 17 is press-fitted into the recess of the elastic member 15. Further, as the adjusting screw 17, a sealing material is applied to the outer periphery of the shaft portion, so that the airtightness between the shaft portion and the mounting hole 14 is maintained. The adjusting screw 17 corresponds to the adjusting mechanism in the present invention. As shown in FIG. 3, the elastic member 15 is a straight line that directly intersects with the axis of the valve shaft 8 and is substantially parallel to the axis of the valve 9 (a straight line passing through both open ends of the valve) when fully opened. It is located on L. Note that the valve 9 is shown in the fully closed state in FIG. 3, and the valve 9 is shown in the fully open state in FIGS. 1 and 2.

According to the intake control valve device for an internal combustion engine, the elastic member 15 is pressed against the tip of the valve shaft 8 so that the tip of the valve shaft 8 is pressed against the wall surface of the bearing hole 4. . For this reason, vibration of the tip end portion of the valve shaft 8 is prevented, and thereby a shaft hammering sound generated between the valve shaft 8 and the bearing hole 4 supporting the valve shaft 8 is reduced. As the valve shaft 8 is rotated by the actuator 21, the elastic member 15 rolls on the outer peripheral surface of the valve shaft 8.

By assembling the elastic member 15 and the adjusting screw 17 after inserting the valve shaft 8 into the housing 1, the valve shaft 8 can be inserted into the passage hole 2 of the housing 1 without sliding resistance. Therefore, the assembling property of the valve shaft 8 is better than that of the conventional device. Further, the pressing force of the elastic member 15 against the valve shaft 8 can be adjusted by rotating the adjusting screw 17 in the screw tightening direction or in the loosening direction, whereby the elastic member 15 rotates the valve shaft 8. The sliding resistance with respect to can be adjusted to an appropriate value, and since the sliding resistance and the size of the elastic member are irrelevant, the elastic member 15 can be manufactured with a rough size. Further, in the case where the elastic member 15 is arranged on the straight line L which is orthogonal to the axis of the valve shaft 8 and is substantially parallel to the axis of the valve 9 when fully opened, the intake pulsation in the valve closed state and the valve open state close to it is caused. The vibration of the valve shaft 8 can be effectively absorbed by the elasticity of the elastic member, and a high vibration damping effect can be obtained.

[0012]

[Effect of device]

 According to the present invention, the following effects can be obtained. In the intake control valve device for an internal combustion engine according to the first aspect of the present invention, the valve shaft can be inserted into the housing without sliding resistance, so that the valve shaft can be assembled more easily than the conventional device. Further, the sliding resistance of the elastic member against the rotation of the valve shaft can be adjusted to an appropriate value by the adjusting mechanism, and since the sliding resistance and the size of the elastic member are irrelevant, the elastic member has a rough size. Can be manufactured. Further, in the intake control valve device for an internal combustion engine according to claim 2, the vibration of the valve shaft due to the intake pulsation in the valve closed state and the valve open state close thereto can be effectively absorbed by the elasticity of the elastic member, which is high. Anti-vibration effect can be obtained.

[Brief description of drawings]

FIG. 1 is a side sectional view of an intake control valve device for an internal combustion engine.

FIG. 2 is a front view of the same device.

FIG. 3 is a side view showing the periphery of the mounting portion of the actuator.

FIG. 4 is an enlarged view of a main part.

FIG. 5 is a cross-sectional view showing a conventional example.

[Explanation of symbols]

 1 Housing 2 Passage Hole 8 Valve Shaft 9 Valve 15 Elastic Member 17 Adjustment Screw (Adjustment Member) 21 Actuator

Front page continuation (72) Inventor Toshiyuki Masui 1-1-1, Kyowa-cho, Obu-shi, Aichi Aisan Industry Co., Ltd.

Claims (2)

[Scope of utility model registration request] 1. A passage hole communicating with an intake passage of an internal combustion engine is provided in a housing, a valve shaft is rotatably inserted in the housing so as to traverse the passage hole, and the passage hole is formed in the valve shaft. In an intake control valve device for an internal combustion engine, in which an opening / closing valve is attached, and an actuator for opening / closing the valve is connected to a base end portion of the valve shaft, which has elasticity to come into contact with a side surface of a tip end portion of the valve shaft. An intake control valve device for an internal combustion engine, comprising: an elastic member; and an adjusting mechanism capable of adjusting a pressing force of the elastic member against a valve shaft. 2. The intake control valve device for an internal combustion engine according to claim 1, wherein the elastic member is arranged on a straight line orthogonal to the axis of the valve shaft and substantially parallel to the axis of the valve when fully opened.