JPH0519762U - Valve opening and closing device - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent a decrease in holding force for the valve shaft and to smoothly rotate the valve shaft. [Structure] A ball 15 that abuts on the tip of the valve shaft 8, a spring 16 that presses the ball 15 against the valve shaft 8, and an adjusting screw 17 that adjusts the biasing force of the spring 16 against the ball 15. As the valve shaft 8 is rotated, the balls 15 roll on the outer peripheral surface of the valve shaft 8.
The biasing force of the spring 16 with respect to the ball 15 is adjusted by rotating the adjusting screw 17 in the screw tightening direction or the loosening direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a valve opening / closing device applied to an intake system of an engine, for example.

[0002]

[Prior Art]

 A conventional valve opening / closing device is disclosed in, for example, Japanese Utility Model Laid-Open No. 62-151484. As shown in the sectional view of FIG. 6, this valve opening / closing device has a bearing of a valve shaft 36 that traverses the passage holes 32 to 35 in a housing 31 in which a plurality of passage holes 32 to 35 are arranged in parallel. Holes 37 to 41 are provided, a valve shaft 36 is rotatably inserted in the bearing holes 37 to 41, and an on-off valve 42 to 45 for opening and closing the passage holes 32 to 35 is provided on the valve shaft 36, respectively. The seal member 46 is attached to one end of the valve shaft 36 so as to seal the gap between the valve shaft 36 and the bearing hole 36, and the one end of the valve shaft 36 is provided with a handle 47 linked to a drive source. O-rings 48 and 49 as springs are provided between the other end of the valve shaft 36 and the bearing holes 40 and 41 of the housing 31, respectively.

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned conventional valve opening / closing device, the inlet edge A (left side in the drawing) of each of the bearing holes 37 to 41 is angled substantially at a right angle. Therefore, when the valve shaft 36 is inserted into the housing 31, the O-rings 48 and 49 that must pass through the bearing holes 37, 38, ... It is expected that the O-rings 48 and 49 will be damaged due to the action. Note that the breakage of the O-rings 48, 49 leads to a reduction in the holding force (also referred to as a vibration isolation force) against the valve shaft 36. Further, since the O-rings 48 and 49 are made of a rubber material, they are likely to be worn by repeated rotations of the valve shaft 36, and are likely to be permanently deformed due to the heat of the engine. In addition, the anti-vibration force tends to decrease. Further, according to the O-rings 48 and 49, since the entire circumference of the valve shaft 36 is elastically contacted, the sliding resistance associated with the rotation of the valve shaft 36 is large, and the rotation of the valve shaft 36 cannot be performed smoothly. The problem remains. In addition, the above-mentioned problems cause troubles such as shortening of device life and deterioration of quality.

Therefore, the present invention has been made in order to solve the above-mentioned problems, and the purpose thereof is to prevent a decrease in holding force for the valve shaft and to smoothly rotate the valve shaft. An object is to provide a valve opening / closing device.

[0005]

[Means for Solving the Problems]

 According to another aspect of the present invention, there is provided a valve opening / closing device, wherein a plurality of passage holes are provided in a housing, a valve shaft is rotatably inserted through the housing so as to traverse the passage holes, and the valve shaft is provided with the passage shaft. An opening / closing valve for opening / closing a passage hole is attached, and an actuator for opening / closing the opening / closing valve is connected to a base end portion of the valve shaft. A spring that presses the ball against the valve shaft; and an adjusting screw that adjusts the biasing force of the spring with respect to the ball. Further, it is desirable that the urging direction of the ball by the spring is set to be substantially the same as the radial direction of the valve shaft and the direction in which the valve opening force by the actuator is applied to the base end portion of the valve shaft. ..

[0006]

[Action]

 According to the above means, the spring presses the ball against the tip of the valve shaft to prevent vibration and pulsation of the tip of the valve shaft, so that the space between the valve shaft and the bearing hole that supports it is prevented. The tapping sound generated in the is reduced. Also, since the ball makes point contact with the valve shaft, the contact area is much smaller than in the case of the conventional O-ring. Also, the biasing force of the spring with respect to the ball can be adjusted by rotating the adjusting screw in the screw tightening direction or the loosening direction. Also, if the direction of biasing the ball by the spring is set to be almost the same as the direction in which the valve opening force by the actuator is applied to the base end of the valve shaft, the Vibration in the direction opposite to the valve opening force of the actuator can be effectively absorbed by the elasticity of the spring.

[0007]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. Example 1 A valve opening / closing device of Example 1 is shown in a sectional view in FIG. The housing 1 has left and right passage holes 2 and 3. The housing 1 is formed with bearing holes 4 to 6 which traverse the passage holes 2 and 3. In detail, the bearing holes 4 to 6 are bearing holes that penetrate the bearing hole 4 on the left side and the bearing hole 5 in the middle in FIG. 1, and the bearing hole 6 on the right side is a bottomed bearing hole. A valve shaft 8 is rotatably inserted from the left side of the drawing in the bearing holes 4 to 6 so as to cross the passage holes 2 and 3 with a slight clearance. Left and right open / close valves 9 and 10 for opening and closing the passage holes 2 and 3 by rotation of the shaft 8 are attached to the valve shaft 8. An interlocking lever 11 that connects an actuator (21) described later is attached to a base end portion (left end portion in the drawing) of the valve shaft 8.

A seal mounting hole 4 a is formed at the opening end of the left bearing hole 4. A ring-shaped oil seal 12 as a sealing material is fitted in the seal mounting hole 4a. The inner peripheral surface of the oil seal 12 is in contact with the outer periphery of the valve shaft 8 with its elasticity.

Further, as shown in an enlarged view in FIG. 4 in addition to FIG. 1, a mounting hole 14 orthogonal to the bearing hole 6 on the right side is formed in the housing 1. A metal ball 15 and a metal spring 16 are inserted into the mounting hole 14 in this order, and then an adjust screw 17 is screwed. Therefore, the ball 15 is in contact with the outer peripheral surface of the distal end of the valve shaft 8 by the urging force of the spring 16 while being pressed.

As shown in the front view of FIG. 2, the valve opening / closing device is configured as a valve device for the intake system of the engine by connecting the housings 1 symmetrically. By coupling the housings 1, the adjacent interlocking levers 11 are connected by the clip 19. An actuator 21 is attached to the housing 1 via a bracket 20 as shown in a sectional view taken along the line III-III in FIG. 3, and an operating rod 22 of the actuator 21 is attached to an interlocking lever. 11 is connected by a pin 23. Therefore, the valve shaft 8 is rotated via the interlocking lever 11 by the operation of the actuator 21, so that the opening / closing valves 9 and 10 open and close the passage holes 2 and 3.

In addition, the biasing direction of the ball 15 by the spring 16 is such that, in the radial direction of the valve shaft 8, the valve opening action force by the retracting operation of the operating rod 22 of the actuator 21 is the valve shaft 8 The direction is almost the same as the direction (almost downward in FIG. 3) applied to the base end of the.

According to the valve opening / closing device described above, since the ball 15 is pressed against the tip end portion of the valve shaft 8 by the spring 16, the tip end portion of the valve shaft 8 is pressed against the wall surface of the bearing hole 6. Is set For this reason, vibration and pulsation of the tip portion of the valve shaft 8 are prevented, thereby reducing the tapping sound generated between the valve shaft 8 and the bearing hole 6 supporting the valve shaft 8. The ball 15 rolls on the outer peripheral surface of the valve shaft 8 as the valve shaft 8 is rotated by the actuator 21. Therefore, unlike the case where the conventional O-ring is used, it is possible to avoid the reduction of the holding force of the valve shaft 8 due to the damage, wear and permanent set of the O-ring.

Further, since the ball 18 makes point contact with the valve shaft 8, the contact area is considerably smaller than that of the conventional O-ring. Although the ball 18 makes a line contact with the spring 16, the increase in the contact area is small. Therefore, the sliding resistance caused by the rotation of the valve shaft 8 is considerably reduced as compared with the conventional one. Further, by adjusting the biasing force of the spring 16 with respect to the ball 15 by rotating the adjusting screw 17 in the screw tightening direction or in the loosening direction, the sliding resistance related to the rotation of the valve shaft 8 is adjusted. Can be minimized. Therefore, smooth rotation of the valve shaft 8 can be ensured.

Further, since the urging direction of the ball 15 by the spring 16 is set to be substantially the same as the direction in which the valve opening action force by the actuator 21 is applied to the base end portion of the valve shaft 8, the valve opening operation is performed. Vibration in the direction opposite to the valve opening force of the actuator 21 generated at the tip of the valve shaft 8 during operation can be effectively absorbed by the elasticity of the spring 16 and a high vibration damping effect can be obtained.

Second Embodiment A second embodiment will be described. Since this example is a modification of part of the first embodiment, the modified parts will be described in detail, and the parts that are considered to have the same or equivalent configurations as those of the first embodiment will be denoted by the same reference numerals in the drawings and will be duplicated. The description is omitted. In this example, a ball pressing member 18 made of a material such as carbon having a low coefficient of friction is interposed between the ball 15 and the spring 16. According to this, since the sliding resistance between the ball 15 and the spring 16 is reduced, the rotation of the ball 15 becomes smoother, and the valve shaft 8 can be smoothly rotated.

[0016]

[Effect of the device]

 According to the present invention, the following effects can be obtained. In the valve opening / closing device according to the first aspect, since the conventional O-ring is not used, it is possible to avoid a decrease in the holding force for the valve shaft due to breakage, wear and permanent strain of the O-ring. In addition, the contact area with the valve shaft is smaller than the conventional one, and the sliding resistance related to the rotation of the valve shaft is minimized by adjusting the biasing force of the spring against the ball by the rotation of the adjusting screw. Therefore, the smooth rotation of the valve shaft can be ensured. Further, in the valve opening / closing device according to the second aspect of the present invention, the vibration in the direction opposite to the valve opening action force of the actuator generated at the front end portion of the valve shaft 8 during the valve opening operation is effectively caused by the elasticity of the spring. It can be absorbed and a high vibration damping effect can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a valve opening / closing device according to a first embodiment of the present invention.

FIG. 2 is a front view showing a valve opening / closing device applied to an intake system of an engine.

3 is a sectional view taken along line III-III in FIG.

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

FIG. 5 is a cross-sectional view of essential parts showing a second embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a conventional example.

[Explanation of symbols]

 1 Housing 2 and 3 Passage Hole 8 Valve Shaft 9 and 10 Open / close Valve 15 Ball 16 Spring 17 Adjusting Screw 21 Actuator

Claims (2)

[Scope of utility model registration request] 1. A housing is provided with a plurality of passage holes,
A valve shaft is rotatably inserted through the housing so as to traverse the passage hole, an opening / closing valve for opening / closing the passage hole is attached to the valve shaft, and an actuator for opening / closing the opening / closing valve is provided on the valve shaft. In a valve opening / closing device connected to the base end of the valve, a ball that abuts on the tip of the valve shaft, a spring that presses the ball against the valve shaft, and an adjuster that adjusts the urging force of the spring with respect to the ball. A valve opening / closing device comprising a screw and a screw. 2. The ball urging direction by the spring is set to be substantially the same as the radial direction of the valve shaft, in which the valve opening force by the actuator is applied to the base end portion of the valve shaft. The valve opening / closing device according to Item 1.