JP4341900B2 - Operation torque setting mechanism of rotary operation knob - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an operation torque setting mechanism for a rotary operation knob, and more particularly to an operation torque setting mechanism for a rotary operation knob that can easily set the operation torque of the rotary operation knob to an optimum value.
[0002]
[Prior art]
Conventionally, in order to select the tuning frequency, volume, etc. of a radio device, etc., the knob for rotating the rotary operation part has been set to an appropriate value so that the tuning frequency, volume, etc. can be easily adjusted and kept in a stopped state. It was.
[0003]
Conventionally, the operating torque has been set according to the amount of grease applied to the rotary sliding portion of the variable resistor (hereinafter referred to as volume) or the ball bearing. According to this method, the upper limit of the operating torque was limited, and the viscosity of the grease changed depending on the usage environment such as temperature difference, and the operating torque varied greatly.
[0004]
In the conventional operating torque setting mechanism shown in FIG. 4, a leaf spring 8 is interposed between a bearing 2b that rotatably supports the rotary shaft 2a of the volume 2 and a step portion of the rotary shaft 2a. The operating torque was increased by the frictional force between 2b and the rotating shaft 2a. Also in this case, the upper limit of the operating torque is limited, and it is difficult to obtain a stable operating torque.
[0005]
In the conventional operating torque setting mechanism shown in FIG. 5, a bearing 2b that rotatably supports the rotary shaft 2a of the volume 2 is inserted into the hole 1a of the panel 1, and a nut 3 is attached to a male screw provided on the outer periphery of the bearing 2b. And the volume 2 is fixed to the panel 1 by tightening the nut 3.
[0006]
The knob 6 is fixed to the rotating shaft 2a. At this time, a dish-like friction member 9 having a hole in the center made of rubber is attached to the knob so as to rotate integrally with the knob 6, and the friction member 9 and the panel 1 are attached. The operating torque is set by the frictional force between
[0007]
In this operating torque setting mechanism, the frictional force between the friction member 9 and the panel 1 is unstable due to variations in the vertical position of the panel 1 and the knob 6, so that the operating torque varies and can be set to an optimum value. There wasn't.
[0008]
In the conventional operating torque setting mechanism shown in FIG. 6, a bearing 2b that rotatably supports the rotary shaft 2a of the volume 2 is inserted into a hole in the chassis 7, and a nut 3 is screwed into a male screw provided on the outer periphery of the bearing 2b. Then, the volume 2 is fixed to the chassis by tightening the nut 3.
[0009]
The O-ring 5 is bonded and fixed to the knob 6 fixed to the rotating shaft 2a. The O-ring 5 is pressed against the panel 1 through which the knob 6 is inserted, and the operation torque is set by the frictional force between the O-ring 5 and the panel 1.
[0010]
In this operating torque setting mechanism, the operating torque varies due to component variations and cannot be set to an optimum value. Further, since an adhesive for adhering the O-ring 5 to the knob 6 is necessary, it is necessary to manage the application amount and the adhesion state, and the productivity cannot be increased.
[0011]
The rotational torque adjusting device for a shaft proposed in Japanese Utility Model Publication No. 6-7381 discloses a helical spring screwed onto a male screw provided on the outer periphery of a bearing that rotatably supports the shaft, and a small diameter at one end of the helical spring. The retaining ring that is fitted in the groove of the rotating shaft through the washer is suppressed at the portion, and the operation torque setting is set by the frictional force between the retaining ring and the bearing.
[0012]
In this rotational torque adjusting device, the rotational torque can be adjusted by changing the amount by which the helical spring is threadedly engaged with the male screw provided on the outer periphery of the bearing, but the helical spring is threadedly adjusted to a screw having a small pitch. Was extremely difficult.
[0013]
[Patent Document 1]
No. 6-7381 (2nd page, FIG. 8)
[0014]
[Problems to be solved by the invention]
The present invention has been made in view of the above points, and an object of the present invention is to provide an operation torque setting mechanism for a rotary operation knob capable of setting the rotation torque to a stable value.
[0015]
[Means for Solving the Problems]
The operating torque setting mechanism for the rotary operation knob according to the present invention is a mechanism for setting the operation torque of the rotary operation knob fixed to the rotary shaft of the rotary operation component to an optimum value, and is rotatable by inserting the rotary shaft. A bag that is provided with a front end face of a bearing that is supported on the shaft and an elastic ring that is pressed against the rotating shaft, and that the elastic ring is screwed into a male screw provided on an outer periphery of a bearing that rotatably supports the rotating shaft. A compression amount that is compressed and deformed by being pressed against the front end surface by a nut is variable, a pressing force according to the compression amount is applied to the rotating shaft, and the operation torque is set by a rotational position of the cap nut. is there.
[0017]
Further, the operating torque setting mechanism before Kikai rolling operation knob, in which the elastic ring and an O-ring.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
A torque variable mechanism for a rotary operation knob according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing an operation torque setting mechanism for a rotary operation knob as a reference example of the present invention, and FIG. 2 is a partial cross-sectional view for explaining the operation of the operation torque setting mechanism for the rotation operation knob.
[0019]
A bearing 2b that rotatably supports the rotary shaft 2a of the volume 2 shown in FIG. 1 is inserted into the hole 1a of the panel 1, and a cap nut 4 is screwed into a male screw provided on the outer periphery of the bearing 2b. The volume 2 is fixed to the panel 1 by tightening.
[0020]
Since the O-ring 5 is placed on the bearing 2b and the cap nut 4 is tightened so as to cover the O-ring 5, the O-ring 5 is compressed and deformed to a thickness of X as shown in FIG. At this time, the outer periphery of the O-ring 5 is expanded and the inner periphery is reduced, and the O-ring 5 is pressed against the rotating shaft 2 a and the cap nut 4.
[0021]
The O-ring 5 has a small change in elasticity with respect to the change in elastic deformation, so that even when the cap nut 4 and the bearing 2b have some variation in size, a stable pressure contact force to the rotary shaft 2a is obtained, and the operation torque of the rotary operation knob is stable. To do. The O-ring 5 also functions as a waterproof in the volume 2.
[0022]
Figure 3 is a sectional view showing an operating torque setting mechanism of the rotational operation knob is a real施例of the present invention. In this example, a bearing 2b that rotatably supports the rotary shaft 2a of the volume 2 is inserted into the hole 1a of the panel 1, and the nut 3 is screwed into a male screw provided on the outer periphery of the bearing 2b to tighten the nut 3. Thus, the volume 2 is fixed to the panel 1.
[0023]
An O-ring 5 is placed on the bearing 2b, and the cap nut 4 is screwed onto a male screw provided on the outer periphery of the bearing 2b so as to cover the O-ring 5. When the cap nut 4 is tightened, the O-ring 5 is compressed and deformed to a thickness of X as shown in FIG.
[0024]
At this time, the outer periphery of the O-ring 5 is expanded and the inner periphery is reduced, and the O-ring 5 is pressed against the rotating shaft 2 a and the cap nut 4. In this example, the pressure contact force of the O-ring 5 can be easily changed by the tightening amount of the cap nut 4. Therefore, it is easy to set the operation torque by the frictional force between the O-ring 5 and the rotary shaft 2a and the cap nut 4, and the set operation torque is stabilized.
[0025]
The embodiment is configured as described above, but the invention is not limited to this. For example, another ring-shaped elastic member may be used instead of the O-ring. Further , the present invention can be applied to other rotational operation parts other than the volume .
[0026]
【The invention's effect】
According to the operating torque setting mechanism of the present invention, it is extremely easy to set or change the operating torque, and the productivity is increased.
[0027]
Further, since the operating torque is not set by grease whose viscosity changes greatly with temperature change, the set torque does not fluctuate greatly with temperature change.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an operation torque setting mechanism of a rotary operation knob as a reference example of the present invention.
FIG. 2 is a partial cross-sectional view for explaining an operation of an operation torque setting mechanism of the rotation operation knob.
3 is a cross-sectional view showing an operating torque setting mechanism of the rotational operation knob is a real施例of the present invention.
FIG. 4 is a cross-sectional view showing an example of an operation torque setting mechanism of a conventional rotary operation knob.
FIG. 5 is a cross-sectional view showing another example of an operation torque setting mechanism of a conventional rotary operation knob.
FIG. 6 is a cross-sectional view showing still another example of an operation torque setting mechanism for a conventional rotary operation knob.
[Explanation of symbols]
1 Panel 1a Hole 2 Volume 2a Rotating shaft 2b Bearing 3 Nut 4 Cap nut 5 O-ring 6 Knob 7 Chassis 8 Leaf spring 9 Friction member

Claims (2)

In a mechanism for setting the operation torque of a rotary operation knob fixed to the rotary shaft of a rotary operation component to an optimum value, the front end surface of a bearing that is rotatably supported by inserting the rotary shaft and press-contacting the rotary shaft A compression ring that is compressed and deformed by being pressed against the front end surface by a cap nut screwed to a male screw provided on an outer periphery of a bearing that rotatably supports the rotating shaft. An operation torque setting mechanism for a rotary operation knob, characterized in that the amount is variable, a pressure contact force corresponding to the compression amount is applied to the rotation shaft, and the operation torque is set according to a rotation position of the cap nut . The operation torque setting mechanism for a rotary operation knob according to claim 1, wherein the elastic ring is an O-ring .

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