JP2000192983A - Rotary object installing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of items of installing intermediary members, and to improve installing workability and the cost aspect on condition of preventing slipping-out of a rotary object by a head part of a machine screw and preventing rotation of the machine screw. SOLUTION: A projection 11c is integrally projected inward in the radial direction from a peripheral directional part of a shaft hole 11a of a rotary object 11, and a projection 12c is integrally projected in the axial direction from a shaft end surface 12a of a fixed shaft 12. The rotary object 11 is fitted to the fixed shaft 12 in the shaft hole 11a, and a male screw part 14b of a machine screw 14 is threadedly engaged with and fastened to a machine screw hole 12b of the fixed shaft 12, but is fastened until an under surface of a head part 14a of the machine screw 14 abuts to the projection 12c of the fixed shaft 12, and the projection 11c of the rotary object 11 is structured so as to enter between an under surface of the head part 14a of the machine screw 14 and the shaft end surface 12a of the fixed shaft 12 in the state by interposing clearance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating object mounting structure for rotatably mounting a rotating object as a rotating object to a fixed shaft as a supporting shaft thereof. The rotating object mounting structure targeted by the present invention is suitable when the dial adjustment knob is mounted on a fixed shaft, but is not limited to such, and is applicable to any device / apparatus. Shall be.

[0002]

2. Description of the Related Art FIG. 7 is a perspective view showing an example of a conventional rotating object mounting structure in a disassembled state. In this figure, 1 is a rotating object, 2 is a fixed shaft, 3 is a washer,
4 is a screw and 5 is a flanged screw. The rotating body 1 is fitted to the fixed shaft 2 in the shaft hole 1a, and the washer 3 whose hole is aligned with the screw hole 2b of the fixed shaft 2 is fixed to the fixed shaft 2.
The screw 4 is screwed into the screw hole 2b of the fixed shaft 2 through the hole of the washer 3 and tightened, and the screw 4 is screwed into the screw hole 2b of the fixed shaft 2 through the hole of the washer 3. Are attached to the fixed shaft 2 in a retaining state. The flanged screw 5 will be described later.

Since the outer diameter of the head 4a of the screw 4 is substantially the same as the outer diameter of the fixed shaft 2, the rotating body 1 cannot be directly stopped by the head 4a of the screw 4 without the washer 3. Therefore, the washer 3 is used. That is,
The washer 3 is used as a means for expanding the working diameter of the head 4 a of the screw 4. The washer 3 is the head 4a of the screw 4.
Of the rotating object 1 to the center of the surface 1b of the rotating object 1. The lower surface of the head 4a of the screw 4 holds the washer 3 under a sufficient area.
Presses the central portion of the surface 1b of the rotating object 1 with a sufficient area. As a result, the washer 3 stops the rotating object 1 in cooperation with the screw 4.

Further, the following can be said. In the attached state, the washer 3 is pressed by the head 4 a of the screw 4. By this pressing, the washer 3 is pressed against the shaft end face 2a of the fixed shaft 2, but as a reaction,
Receives a reaction force from the shaft end face 2a. In other words, washer 3
Is held between the screw 4 and the fixed shaft 2, so that the position is fixed to the fixed shaft 2 both in the axial direction and in the circumferential direction around the axis. The rotating object 1 rotates with respect to the fixed shaft 2. At this time, since the washer 3 is fixed to the fixed shaft 2, the co-rotation (follow-up rotation) of the washer 3 due to the rotation of the rotating object 1 is prevented. Since the co-rotation of the screws 4 is also prevented, the screws 4 are prevented from loosening.

Further, since the position of the washer 3 is restricted in the axial direction by contacting the fixed shaft 2, even if the washer 3 is tightened by the screw 4, the washer 3 may press the rotating object 1 more than necessary. Absent. That is, a gap is secured between the washer 3 and the rotating object 1, the rotational resistance to the rotating object 1 is reduced as much as possible, and the rotation of the rotating object 1 is made smooth.

In some cases, a flanged screw 5 is used instead of the washer 3 and the screw 4 described above. The flanged screw 5 is screwed into the screw hole 2b of the fixed shaft 2 through the hole of the washer 3, and the flange portion 5b of the flanged screw 5 extends from the shaft end surface 2a of the fixed shaft 2 to the center of the surface 1b of the rotating body 1. The flanged screw 5 is in contact with
b, and the rotating object 1 is attached to the fixed shaft 2 in a locked state by tightening. In this case, the flange portion 5a of the flanged screw 5 has almost the same function as the washer 3.

[0007]

The above-mentioned prior art has the following problems. First, regarding the rotating object mounting structure using the washer 3 and the screw 4, the screw 4 is used as an intermediate means for mounting the rotating object 1 to the fixed shaft 2.
Not only that, but also two washers 3 are required, which is disadvantageous in terms of cost and poor in installation workability. In the case of the flanged screw 5, which is one member, the flanged screw 5 is a screw of a special form, which is disadvantageous in cost.

Further, since the central portion of the surface 1b of the rotating object 1 is covered with the washer 3 and the flange 5b, the usable area when the surface 1b of the rotating object 1 is used for a print display surface or the like is small. ing. When used on a print display surface, the printed content is difficult to see.

FIG. 8 shows an embodiment in which the head 4a of the screw 4 does not protrude above the surface 1b of the rotating object 1. On the surface 1b side of the rotating object 1, a circular concave portion 1d for fitting the washer 3 to the axial center portion is formed. Recess 1
The depth of d is substantially equal to the height of the head 4a of the screw 4. The diameter φ _{1 of the} concave portion 1 d is the rotating object 1 for fitting the washer 3.
Is relatively large with reference to the outer diameter R of the surface 1b, and as a result, the available area corresponding to the range indicated by the thick line that can be used for the printed display surface of the surface 1b is narrowed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is an ordinary and cost-effective ordinary shaft for mounting a rotating object on a fixed shaft in a state in which the rotating object is prevented from falling out and allows smooth rotation. It is an object of the present invention to be able to mount as intended using screws and using only one screw. In addition, it is another object of the present invention to ensure a sufficient available area of the surface of the rotating object.

[0011]

The rotating object mounting structure according to the first aspect of the present invention has the following structure. In other words, as a premise configuration, the rotating body is fitted to the fixed shaft by fitting the shaft hole of the rotating body along the axial direction from the shaft end face side, and screwing the screw to the fixed shaft to tighten the rotating body. It is configured to be attached to the fixed shaft in a state where it is prevented from coming off in the axial direction and is rotatable. In this case, in order to avoid using a washer and not to use a screw with a flange when stopping a rotating object with a screw head (screw head), the screw head is caught on the screw head. The resulting projection is projected radially inward from a part of the shaft hole of the rotating object. Further, in order to fix the position of the screw head with respect to the fixed shaft, a projection for contacting and receiving the screw head is projected in the axial direction from the shaft end face of the fixed shaft. In other words, in the state where the rotating object is fitted to the fixed shaft and the screw is screwed to the fixed shaft and tightened, the screw head is brought into contact with the protrusion of the fixed shaft, and the screw head and the shaft end surface of the fixed shaft are in contact with each other. The structure is such that the projection of the rotating object enters between them. According to this configuration, when attaching the rotating object to the fixed shaft in a state where the rotating object is prevented from falling off and allowing smooth rotation, a projection that is retained by the screw head is provided on the rotating object, and a projection that supports the screw head is provided. This is supported by providing it on a fixed shaft. And as a means for attaching the rotating object to the fixed shaft, only one screw is used as an intermediate means, and an ordinary screw may be used, and a washer or a flange as in the case of the conventional technology is used. Since a special form of screw such as a screw need not be used, the workability of the attachment is improved, and the development of the cost is advantageous. Further, as a means for bridging between the screw head and the surface of the rotating object, a projection protruding from the rotating object is configured to enter under the screw head, and a washer or a flanged screw as in the case of the conventional technology is used. When the surface of the rotating object is to be used for a print display surface or the like, the available area is sufficient.

According to a second aspect of the present invention, in the first aspect, when the axial length of the projection of the rotating object is H1 and the axial length of the projection of the fixed shaft is H2,
The relationship between the two is set as H1 <H2. According to this configuration, in a state where the screw head is brought into contact with the projection of the fixed shaft to prevent the screw from rotating, the necessary rotation of the rotating object between the screw head and the projection of the rotating object is necessary. A gap is secured.

According to a third aspect of the present invention, there is provided a rotating object mounting structure according to the first and second aspects, wherein the projection of the rotating object and the projection of the fixed shaft are formed in a positional relationship in which their side surfaces overlap in the radial direction. The two side surfaces are configured to abut as the rotating object rotates. According to this configuration, a stopper function for restricting further rotation is exerted by contact between the side surfaces of both projections in both clockwise rotation and counterclockwise rotation.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a rotating object mounting structure according to the present invention will be described below in detail with reference to the drawings. In the following embodiments, a dial adjustment knob for channel selection in a channel selection adjustment device of a radio receiver will be described as an example of a rotating object. However, the technical scope of the present invention is not limited thereby, and any rotating object may be adopted.

FIG. 1 is an exploded perspective view of a rotating object mounting structure according to an embodiment, FIG. 2 is a vertical sectional view of a main part of the rotating object mounting structure, and FIG. It is a top view. Rotating object 11 as dial adjustment knob
Is formed with a shaft hole 11a penetrating the shaft center thereof.
A projection 11c is integrally protruded radially inward from a part of the arc facing the shaft hole 11a on the surface 11b of the rotating body 11. The outer diameter of the fixed shaft 12 into which the rotating object 11 is fitted in the shaft hole 11a is slightly smaller than the inner diameter of the shaft hole 11a. The fixed shaft 12 is formed with a screw hole 12b extending from the shaft end face 12a in the axial direction at a certain depth. On the inner peripheral surface of the screw hole 12b, a female screw for screwing the male screw portion 14b of the mounting screw 14 is formed. The outer diameter of the head 14 a of the screw 14 is substantially the same as the outer diameter of the fixed shaft 12. Shaft end surface 12a of fixed shaft 12
A projection 12c is integrally protruded outwardly in the axial direction. The length of the protrusion 11c of the rotating body 11 protruding inward in the radial direction is determined by a screw 14
Is set as long as possible without interfering with the insertion of the male screw portion 14b. Specifically, the protruding length of the protrusion 11 c inward in the radial direction substantially corresponds to the thickness of the fixed shaft 12. Under the condition that the lower surface 11c ₁ of the protrusion 11c of the rotating object 11 is in contact with the axial end face 12a of the fixed shaft 12, the surface 11 of the projecting end surface 12c ₁ of the protrusion 12c of the fixed shaft 12 is rotating object 11
b. In order to set in this way, specifically, assuming that the axial length of the protrusion 11c of the rotating object 11 is H1 and the axial length of the protrusion 12c of the fixed shaft 12 is H2, H1 <H2 is set. It is. In the above contact condition, if H1 <H2, the fixed shaft 1
Protruding end surface 12c ₁ of the second protrusion 12c will be positioned above the surface 11b of the rotating object 11. It is preferable that H1 and H2 have values as close as possible.

A rotating object 11 is fitted to a fixed shaft 12 in a shaft hole 11a. At this time, the lower surface 11c ₁ of the projection 11c of the rotating object 11 is the shaft end surface 12a of the fixed shaft 12.
Is in contact with Male screw part 14b of screw 14 is fixed shaft 1
2 is screwed into the screw hole 12b.
Projections of the fixed shaft 12 is the lower surface 14a ₁ of 4 of the head 14a 12
c is in contact with the protruding end surface 12c ₁ and the head 14a is
Since the head 14a receives the reaction force from the projection 12c by pressing the screw c, the screw 14 is in the state of being prevented from rotating, that is, in the state of being prevented from loosening due to the static friction force due to the reaction force. Fixed shaft 1
Since has entered the projection 11c of the rotating object 11 is further below the bottom surface 14a ₁ of 2 screwed bis 14 of the head 14a, the protrusion 11c thus rotating object 11 is retained by the head 14a of the screw 14 ing. H1 <H2
From the relationship, the clearance 13 is secured between the surface of the protrusion 11c of the lower surface 14a ₁ and the rotating object 11 of the head 14a of the screw 14, the head 14a of the screw 14 presses the rotating object 11 If not, or even if it is pressed, the pressing force is sufficiently small, so that the rotating body 11 can rotate smoothly. In addition, the presence of the gap 13 prevents co-rotation (follow-up rotation) of the screw 14 due to rotation of the rotating object 11 and prevents loosening of the screw 14. In addition,
The rotating object 11 as a dial adjusting knob for channel selection in the channel selecting / adjusting device has a portion connected to the variable condenser, but is not directly related to the gist of the present invention, so that illustration and description thereof are omitted here.

The rotating object mounting structure of the present embodiment uses only the screw 14 as an intermediate means for mounting the rotating object 11 on the fixed shaft 12, and does not use a washer as in the case of the prior art. No special form of flanged screw is used, and the screw 14 used is an ordinary screw. Since the number of members is small as described above, the workability of mounting is good, and the use of ordinary screws and the good workability of mounting are combined, which is advantageous in terms of cost.

In order to attach the rotating body 11 to the fixed shaft 12 in a state where the rotating body 11 is prevented from coming off in the axial direction by the screw 14, the washer or the flange of the flanged screw is not used.
Since the shaft hole 11a of the rotating object 11 are as retained by causing enter further below the lower surface 14a ₁ of the head portion 14a of the screw 14 a protrusion 11c which is protruded radially inward, being attached by screws 14 And the head 14a of the screw 14 covers the surface 11b of the rotating body 11 is a projection 11c.
Since there is no other place, the available area when the surface 11b of the rotating object 11 is used for a print display surface or the like is maximized. When used on the print display surface, the printed contents can be viewed easily. When the rotating object 11 is used as a dial adjustment knob for channel selection in the channel selection adjustment device, a dial scale is written on the dial adjustment knob, but the written content is easy to see.

FIG. 4 shows that the head 14a of the screw 14 is
An embodiment is shown in which the projection 11 does not protrude above the surface 11b. On the surface 11b side of the rotating body 11, a circular concave portion 11d is formed in the axial center portion. The depth of the concave portion 11d is equal to or greater than the height of the head portion 14a of the screw 14. The diameter φ _{0 of the} recess 11 d is slightly larger than the diameter of the head 14 a of the screw 14, and is relatively small with respect to the outer diameter R of the surface 11 b of the rotating body 11. That is, since a washer or a screw with a flange as in the case of the conventional technique is not used, the diameter φ _{0 of the} recess 11 d is considerably smaller than the diameter φ ₁ of the recess 1 d in FIG. 8 in the case of the conventional technique. In this case, the available area corresponding to the range shown by the thick line that can be used for the print display surface of the surface 11b of the rotating object 11 is π · ｛(φ ₁ / 2) ^2- (φ ₀ /
2) It has increased by ² mm. The notation contents such as dial scales written on the relatively large available area are easy to see.

In both the embodiment of FIGS. 1 to 3 and the embodiment of FIG. 4, the protrusion 11c of the rotating body 11 and the fixed shaft 1
The two projections 12c are formed in a positional relationship in which the two side surfaces overlap in the radial direction, and the two side surfaces come into contact with the rotation of the rotating object 11. When the rotating object 11 is rotated clockwise, the protrusion 1 of the rotating object 11
The side surface of 1c and the side surface of the projection 12c of the fixed shaft 12 contact each other, and this state becomes the limit of the clockwise rotation. Also,
Conversely, when the rotating object 11 is turned counterclockwise, the two projections 11c,
The other side of 12c abuts against each other, and that condition becomes the limit of rotation in the counterclockwise direction. Assuming that the effective center angle of the protrusion 11c of the rotating object 11 is θ1 and the effective center angle of the protrusion 12c of the fixed shaft 12 is θ2, the allowable rotation range (maximum rotation angle) of the rotating object 11 is 360 ° − ( θ1 + θ2). By appropriately determining the center angles θ1 and θ2 of the projections 11c and 12c, the allowable rotation range can be adjusted. θ1 and θ2 may be different or the same. The functions of the stopper for setting the allowable rotation range can be shared by the projections 11c and 12c.

In general, a stopper for regulating rotation is used to prevent the variable condenser from being damaged when an excessive force is applied to the tuning mechanism of the variable condenser. The stopper function of both the projections 11c and 12c is used.
The stopper of the variable condenser can be used or assisted, so that the stopper of the variable condenser can be omitted or simplified.

As another embodiment different from the above, as shown in FIG. 5, two projections 11c are provided on a rotating
You may be comprised so that two may be provided 180 degrees apart.
In this case, the allowable rotation range of the rotating object 11 is 180 °-
(Θ1 + θ2).

In the case of the embodiment shown in FIG. 5, the head 14a of the screw 14 is
Since it is supported by 2c, the posture of the screw 14 is stabilized. In addition, since the two protrusions 11c positioned in the diametrical direction of the rotating body 11 prevent the head 14a of the screw 14 from falling off, the effect of preventing the falling off becomes more reliable, and the posture of the rotating body 11 is stabilized. I do. When the allowable rotation range may be small, the number of protrusions 11c and 12c may be further increased. The number of projections 11c of the rotating object 11 and the number of projections 12c of the fixed shaft 12 may be the same or different. In any case, it is preferable to provide them at equal intervals in the circumferential direction.

As still another embodiment, as shown in FIG. 6, a plurality of projections 11c of
When a plurality of the second protrusions 12c are provided, an endless rotation exceeding 360 ° may be allowed. Rotating object 11
The plurality of protrusions 11c on the side have a radially inwardly projecting length of about half the thickness of the fixed shaft 12 and the fixed shaft 1
The width of the plurality of protrusions 12c on the second side in the radial direction is set to about half of the thickness of the fixed shaft 12 from a position corresponding to the inner peripheral surface of the screw hole 12b. The size and the positional relationship are such that 11c and 12c do not collide. In this case, the projections 11c, 12c
Are shown by two, but the number is also arbitrary. The protrusion 11c and the protrusion 12c are each 1
A structure that allows endless rotation even if one by one may be used.

The structure of the embodiment shown in FIG. 5 or the structure of the embodiment 3 shown in FIG. 6 may be applied to a rotating body 11 having a recess 11d as shown in FIG.

The rotating object 11 does not need to be limited to a dial adjusting knob for channel selection in the channel selecting / adjusting device, but may be an arbitrary one.

[0027]

According to the first aspect of the present invention, there is provided a rotating object mounting structure for mounting a rotating object to a fixed shaft. At the time of installation, a projection that prevents the screw head from coming off is provided on the rotating body, and a projection that supports the screw head is provided on the fixed shaft, so that the washer or special form of the flanged screw as in the case of the conventional technology It is not necessary to use a single screw, and only one member of ordinary screws may be used, so that the workability of mounting can be improved.
The cost can be advantageously developed from both the number of parts mentioned above and the workability improvement of mounting. Further, when the surface of the rotating object is to be used for a print display surface or the like, it is possible to sufficiently secure the usable area in a state where the surface of the rotating object is used to the maximum.

According to the second aspect of the present invention, the screw head is brought into contact with the projection of the fixed shaft to prevent the screw from rotating, while only the simple dimensional relationship is set. It is possible to secure a gap between the head and the projection of the rotating object to ensure smooth rotation of the rotating object.

According to the third aspect of the present invention, the function of the stopper for defining the allowable rotation range is also provided by a structure in which the side surfaces of both the projection of the rotating object and the projection of the fixed shaft abut against each other. be able to.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a rotating object mounting structure according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a main part of the rotating object mounting structure according to the embodiment;

FIG. 3 is a plan view of a main part of the rotating object mounting structure according to the embodiment with screws removed.

FIG. 4 is a vertical sectional view of a rotating object mounting structure according to an embodiment in which a screw head does not protrude from a rotating object surface in the present invention.

FIG. 5 is a plan view of a main part of another embodiment of the rotating object mounting structure with screws removed.

FIG. 6 is a plan view of a main part of a rotating object mounting structure according to still another embodiment with screws removed.

FIG. 7 is an exploded perspective view showing an example of a rotating object mounting structure according to the related art.

FIG. 8 is a vertical sectional view of a rotating object mounting structure in which a screw head does not protrude from the surface of the rotating object in the related art.

[Explanation of symbols]

11: rotating object, 11a: shaft hole of rotating object, 11b:
The surface of the rotating object (print display surface), projections 11c ...... rotating object, 11c ₁ the lower surface of the projection ...... rotating object, 11d ...... recess 12 ...... fixed shaft, the shaft end faces of 12a ...... fixed shaft, 12
b: screw hole of fixed shaft, 12c: protrusion of fixed shaft, 12
c ₁ ... the protruding end face of the projection of the fixed shaft, 13...
...... bis, 14a ...... bis head, the lower surface of the head of 14a ₁ ...... bis, 14b ...... male threaded portion

Claims (3)

[Claims] 1. A rotating body has a projection protruding radially inward from a part of a shaft hole thereof, and a fixed shaft having a projection protruding in an axial direction from an end face of the shaft to fix the rotating body. In the state where the screw is screwed into the fixed shaft and screwed to the fixed shaft, the head of the screw is brought into contact with the projection of the fixed shaft, and the rotation of the rotating object is made between the head of the screw and the shaft end face of the fixed shaft. Rotating object mounting structure with protrusions. 2. The rotating object mounting structure according to claim 1, wherein the relationship between the axial length H1 of the projection of the rotating object and the axial length H2 of the projection of the fixed shaft is H1 <H2. 3. The projection of the rotating object and the projection of the fixed shaft are formed in a positional relationship in which their side surfaces overlap in the radial direction, and the two side surfaces are configured to abut as the rotating object rotates. The rotating object mounting structure according to claim 1 or 2, wherein: