JPH0540666U - Valve device - Google Patents

Abstract

(57) [Abstract] [Purpose] A valve device in which an end 6 of a shaft 4 to which a valve member is fixed is rotatably inserted into a bearing hole 7 of a body. Prevents a loud noise from being repeatedly struck. [Structure] An end 6 of a shaft 4 is hollow, a slit 9 is provided in the end 6, and the end 6 is widened so that an outer diameter dimension M thereof is larger than an inner diameter dimension N of a bearing hole 7, The end portion 6 is made to have a spring property, and the end portion 6 is elastically pressed against the inner peripheral wall of the bearing hole 7 to eliminate the clearance.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of a valve device. The valve device of the present invention is used, for example, as an intake control valve in a drive system of an automobile.

[0002]

[Prior Art]

 Conventionally, as shown in FIG. 3, a required number (two in the figure) of flow paths 2 are provided in an aluminum body 1, a shaft hole 3 is provided in a direction orthogonal to the flow path 2, and the shaft hole 3 is made of iron. There is known a valve device in which a shaft 4 is rotatably inserted and a required number (two in the figure) of disc-shaped valve members 5 are fixed to the shaft 4. In this valve device, an actuator (not shown) is connected to the right end of the shaft 4 in the figure, the shaft 4 is rotated by the drive of this actuator, and the valve member 5 is rotated in the range of 0 to 90 degrees accordingly. Then, the flow rate of the fluid flowing through the flow path 2 is adjusted.

The end portion 6 of the shaft 4 is rotatably inserted into a bearing hole 7 located at the end of the shaft hole 3, and an end portion between the outer peripheral surface of the end portion 6 and the inner peripheral wall of the bearing hole 7 is an end portion. A predetermined clearance 8 is provided in order to make the rotation of 6 smooth.

[0004]

[Problems to be solved by the device]

 In the above-mentioned prior art, since the clearance 8 is provided between the end portion 6 and the inner peripheral wall of the bearing hole 7, and the shaft 4 and the body 1 are both made of metal, pulsation or vibration is generated in the valve device. When applied, the shaft 4 vibrates, and the end 6 of the shaft 4 is repeatedly struck against the inner peripheral wall of the bearing hole 7, causing a large noise. Since the shaft 4 is connected to the actuator at the right end in the figure and is held at this end at one end, the abnormal noise is generated at the left end in the figure and at the end portion 6 and the inner peripheral wall of the bearing hole 7. Part of.

[0005]

[Means for Solving the Problems] In view of the above points, the present invention has been devised to solve the problems found in the above-mentioned conventional techniques, and in order to achieve this object, a valve member is fixed. In a valve device in which an end of a shaft is rotatably inserted into a bearing hole of a body, the end of the shaft is hollow, a slit is provided at the end, and the outer diameter of the end is equal to that of the bearing hole. (EN) Provided is a valve device characterized in that it is expanded so as to be larger than an inner diameter dimension, and the end portion has a spring property.

[0006]

[Action]

 According to the above configuration, the end of the shaft can be elastically pressed against the inner peripheral wall of the bearing hole, and this pressing can prevent the generation of abnormal noise.

In addition, it is not possible to make the entire shaft thicker than before so as to reduce the clearance, because so-called “blistering” or “galling” occurs on the shaft and adversely affects the operability.

[0008]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 and 2, the end portion 6 of the shaft 4 is molded in the air over a predetermined length L, and the end portion 6 has a required number (four in the figure are equally distributed). Is formed so that the maximum outer diameter dimension M of the end portion 6 is larger than the inner diameter dimension N of the bearing hole 7, and the inner peripheral wall of the bearing hole 7 is extended to the end portion 6. Since the end portion 6 elastically presses against the inner peripheral wall of the bearing hole 7 and pulsation or vibration is applied to the valve device, the shaft 4 does not vibrate and abnormal noise occurs. Does not occur.

At the end portion 6, tapered portions 10 and 11 are formed so as to sandwich the maximum outer diameter portion, and in particular, the tapered portion 10 that is tapered on the tip side (the left side in FIG. 1) of the maximum outer diameter portion. This makes it easier to insert the shaft 4 into the bearing hole 7. 1 and 2 show the main parts of the device, and the structure of the parts not shown is the same as the conventional one.

[0011]

[Effect of the device]

 The present invention has the following effects. That is, the end portion of the shaft is hollow, and a slit is provided at the end portion, and the end portion is expanded so that the outer diameter dimension thereof is larger than the inner diameter dimension of the bearing hole, so that the end portion has a spring property. Therefore, the end of the shaft can be elastically pressed against the inner peripheral wall of the bearing hole to eliminate the clearance and prevent generation of abnormal noise.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a valve device according to an embodiment of the present invention.

[Fig. 2] Side view of the shaft

FIG. 3 is a cross-sectional view of a valve device according to a conventional example.

[Explanation of symbols]

 1 Body 2 Flow Path 3 Shaft Hole 4 Shaft 5 Valve Member 6 End 7 Bearing Hole 8 Clearance 9 Slit 10, 11 Tapered Part

Claims (1)

[Scope of utility model registration request] 1. A valve device in which an end portion 6 of a shaft 4 to which a valve member 5 is fixed is rotatably inserted into a bearing hole 7 of a body 1, and the end portion 6 of the shaft 4 is hollow, and the end portion 6 has a hollow portion. A valve device characterized in that a slit 9 is provided and the end portion 6 is widened so that an outer diameter dimension M thereof is larger than an inner diameter dimension N of the bearing hole 7 so that the end portion 6 has a spring property. .