JP2001349362A - Torque generating mechanism for rotary body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a torque generating mechanism for a rotary body which has viscosity in rotating simultaneously produces a feeling of not rotating unless by strong force and is simple in structure. SOLUTION: Given torque is generated on a rotation of the rotary body by situating an O-ring in a manner to be squeezed between the upper surface of the rotary body 30 and a case 20. The rotary body 30 is provided with an O-ring containing part 33. An O-ring flying-out preventing part A is situated on the outer peripheral side of an O-ring containing part 33. The O-ring flying- out preventing part A is formed such that a protrusion 5 formed on the rotary body 30 and a recessed part 29 are engaged with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torque generating mechanism for a rotating body used for a rotary electronic component or the like.

[0002]

2. Description of the Related Art Conventionally, rotary electronic components such as rotary encoders have a rotating body mounted on a base so as to be rotatable.
A case is put on the case, and a rotating shaft that rotates integrally with the rotating body protrudes from the case. Then, the rotating body is rotated by rotating the rotating shaft, and the switch mechanism provided between the rotating body and the base is turned on / off.

In this type of rotary electronic parts, there is a torque output mechanism for increasing the rotational torque of a rotary shaft, specifically, a torque output mechanism which has a sticky rotational torque and requires a large torque to rotate. Mechanisms were sometimes required. As such a conventional torque output mechanism, there has been a mechanism that utilizes a grease stickiness by providing a torque spring or providing a grease reservoir between a rotating body and a fixed member such as a case.

However, when a torque spring is used,
The rotation of the rotating shaft is hardly sticky, and it is not possible to produce such a large torque. On the other hand, when grease was used, the rotation of the rotating shaft could be made sticky, but not so large torque.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to provide a torque sense that when rotating, it has a stickiness and at the same time does not rotate unless a strong force is applied. An object of the present invention is to provide a simple rotating body torque output mechanism.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a torque generating mechanism for a rotating body according to the present invention is installed between an upper surface or a lower surface of the rotating body and a fixed member so as to crush the elastic member. By doing so, a predetermined torque is generated in the rotation of the rotating body. Here, the elastic member has a ring shape, and an elastic member storage portion is provided on at least one of the surfaces of the rotating member and the fixed member that crush the elastic member, and an elastic member is provided on the outer peripheral side of the elastic member storage portion. It is preferable to provide a member protrusion prevention portion. Further, it is preferable that the elastic member protrusion preventing portion is configured by engaging a projection provided on one of the rotating body and the fixed side member with a concave portion provided on the other.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic side sectional view showing a rotary electronic component 1 to which the present invention is applied, and FIG. 2 is an exploded perspective view thereof. As shown in both figures, this rotary electronic component 1
The slider fixing plate 50 and the rotating body 30 are placed on the bottom plate 80,
The case 20 is placed on the case 20, and the rotating shaft 10 is inserted from above the case 20. Hereinafter, each component will be described.

The rotary shaft 10 is provided with a stepped portion 11 by reducing its outer diameter below the rotary shaft 10, and further provided with a fitting portion 13 below the both sides of which is cut out in parallel.
An engagement groove 15 is provided in an upper portion of the projection 3, and a projection 17 is projected from a lower end surface of the fitting portion 13. Note that tapered projections 17, 17 are provided below the engaging grooves 15, 15 to increase the outer diameter from the lower side to the upper side.

The case 20 has a box-shaped case body 21 having an open lower surface, a through hole 23 in the center, and four locking grooves 25 from the outer peripheral side surface to the upper surface. In the inside of the through hole 23, the inner diameter is enlarged in two steps in the downward direction, so that two step portions 26 and 27 are formed.
Is formed. The periphery of the through hole 23 on the back surface side of the case body 21 is a ring-shaped O-ring pressing portion 28, and further on the outer peripheral side thereof, a projection 35 of the rotating body 30 described below is provided.
Is provided.

Next, the rotating body 30 is configured by attaching a movable contact pattern 34 to the lower surface of a substantially disk-shaped rotating body main body 31. Here, the rotator main body 31 is formed by integrally molding a synthetic resin, and a substantially oval-shaped fitting hole 3 is provided at the center thereof.
2 is provided, and an O-ring accommodating portion 33 formed of a ring-shaped concave portion is provided around the fitting hole 32 on the upper surface of the rotating body main body 31,
Further, a projection 35 is provided on the outer peripheral side of the O-ring storage portion 33 and is engaged with the concave portion 29 of the case 20. A projection 37 protrudes from the center of the lower surface.

FIG. 3 is a rear view of the rotating body 30.
As shown in FIG. 1 and FIG. 1, the movable contact pattern 34 is made of a thin metal plate, and includes a ring-shaped common pattern 39 provided at the center and two on-off patterns 41 and 43 radially protruding from the outer periphery of the common pattern 39. It is comprised including.

As shown in FIGS. 1 and 2, the slider fixing plate 50 has three sliders 53 inside a plate 51 made of synthetic resin.
(53-1, 53-2, 53-3) and a part of each of the three terminals 55 are manufactured by insert molding.

Here, the plate 51 is formed in a substantially square shape.
Two rectangular holes 59 and 61 and one circular hole 64 are provided therein, and four grooves 65 are provided on the outer peripheral side surface thereof. Each of the sliders 53 protrudes the sliding contact 531 from the side surface inside the holes 59 and 61 and bends obliquely upward. On the other hand, each terminal 55 protrudes from the outer peripheral side surface of the plate body 51 and is bent downward. These three terminals 55 are connected to the three sliders 53, respectively.

The bottom plate 80 includes four locking pieces 81 (only three are shown in the figure) and two locking claws 8 from the outer periphery of the rectangular metal plate.
3 (only one is shown in the drawing), the locking piece 81 is bent upward at a right angle, and the locking claw 83 is bent downward at a right angle.

In order to assemble the rotary electronic component 1, first, as shown in FIG.
3, the step 11 of the rotating shaft 10 is brought into contact with the upper surface of the through hole 23, and the C-ring 90 is inserted from the side of the fitting portion 13 protruding below the case 20 to form a tapered projection. 17 and 17 are engaged with the engagement groove 15 in advance.

Next, the slider fixing plate 50 is placed on the bottom plate 80. At this time, each locking piece 81 is engaged in the groove 65.

Next, the rotating body 30 is mounted on the slider fixing plate 50. At this time, the protrusion 37 of the rotating body 30 is rotatably inserted into the hole 64 of the slider fixing plate 50 and is pivotally supported. At this time, the sliding contact 531 of each slider 53 elastically contacts the movable contact pattern 34 (39, 41, 43) on the lower surface of the rotating body 30.

The O-ring 95 is housed in the O-ring housing portion 33 of the rotating body 30, and the case 20 to which the rotating shaft 10 is attached is put thereon. 30), and each locking piece 81 of the bottom plate 80 is inserted into the locking groove 25 of the case 20 and its upper part is bent on the upper surface of the case 20. Parts are completed. It is preferable that the O-ring 95 is coated with grease.

In FIG. 1, when the rotating shaft 10 is rotated, the rotating body 30 is simultaneously rotated, and the sliding contacts 531 of the respective sliders 53 are brought into sliding contact with the movable contact pattern 34, and the ON / OFF output thereof is output. It can be taken out to each terminal 55.

At this time, as shown in FIG.
5 is an O-ring storage portion 33 of the rotating body 30 and an O-ring of the case 10.
Since it is crushed from above and below by the ring pressing portion 28, a strong torque is required when rotating the rotating body 30. Further, when rotating while overcoming the strong torque, stickiness is generated in the rotation. Therefore, a heavy and sticky rotational torque that could not be output conventionally can be reliably obtained. Moreover, since the O-ring 95 is used, it is inexpensive and the mounting structure is easy.

In the embodiment shown in FIG. 1, an O-ring protrusion preventing portion A is formed by engaging a projection 35 provided on the rotating body 30 with a concave portion 29 provided on the case 20 outside the O-ring housing portion 33. are doing. The O-ring protrusion prevention portion A is provided for the following reason.

That is, the present invention can be configured as shown in FIG. In the case of this embodiment, the O-ring protrusion preventing portion A is not provided, and the O-ring housing portion 33 is simply provided on the rotating body 30 side. Even with such a configuration, the effect of reliably obtaining a heavy and sticky rotational torque that could not be obtained conventionally occurs similarly to the above-described embodiment.

However, in the case of this embodiment, when the rotator 30 is rotated, the crushing force of the O-ring 95 is too strong or the gap between the case 20 and the rotator 30 is large. As shown in FIG.
5 may protrude outward from the O-ring accommodating portion 33, and there is a possibility that the sense of torque generated by the O-ring 95 may not be generated.

Therefore, in the embodiment shown in FIG.
In order to prevent the ring 95 from protruding outward, an O-ring protrusion prevention portion A is provided.

The protrusion 35 is provided on the outside of the O-ring housing portion 33.
When the O-ring 95 is provided, the inner surface of the projection 35 serves as a guide when the O-ring 95 is inserted into the O-ring housing portion 33, and the housing can be easily and reliably stored.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims and the technical idea described in the specification and the drawings. Is possible. It should be noted that any shape or material not directly described in the specification and the drawings is within the scope of the technical idea of the present invention as long as the effects and effects of the present invention are exhibited.

For example, in the above embodiment, an example in which the present invention is applied to a rotary switch has been described.
The present invention may be applied to other various rotary electronic components. Further, the present invention can be used as a torque output mechanism for various types of rotating bodies other than the rotary electronic components.

In the above embodiment, the O-ring is squashed between the upper surface of the rotating body and the case. However, in some cases, the O-ring is crushed between the lower surface of the rotating body and the case. Is also good. The crushing of the O-ring together with the rotating body is not necessarily limited to the case, but may be a fixed-side member.

In the above embodiment, the O-ring housing is provided on the rotating body side. Alternatively, the O-ring housing may be provided on the case (fixed member) side. The shape and structure of the O-ring protrusion preventing portion are not limited to the shape and structure of the above-described embodiment. For example, a concave portion may be provided on the rotating body side, and a protrusion meshing with the concave portion may be provided on the fixed side member side. Can be variously deformed.
Any shape and structure may be used as long as it prevents the ring from popping out.

In the above embodiment, the O-ring is used as the elastic member. However, an elastic member having various shapes other than the O-ring may be used.

[0031]

As described in detail above, the present invention has the following excellent effects. Since the elastic member is arranged to be crushed between the upper surface or the lower surface of the rotating body and the fixed-side member, the rotating member has a stickiness when rotating and at the same time, a torque feeling that does not rotate unless strong force is obtained is easily obtained. .

The structure is simple.

Since the elastic member protrusion preventing portion is provided on the outer peripheral side of the elastic member storage portion, the elastic member does not protrude from the elastic member storage portion, and a desired torque feeling can always be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic side sectional view showing a rotary electronic component 1 to which the present invention is applied.

FIG. 2 is an exploded perspective view showing the rotary electronic component 1 to which the present invention is applied.

FIG. 3 is a rear view of the rotating body 30;

FIG. 4 is a schematic side sectional view showing a rotary electronic component 1 to which another embodiment of the present invention is applied.

FIG. 5 is a diagram for explaining the operation of an O-ring protrusion prevention portion A.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 rotary electronic component 10 rotary shaft 20 case (fixed-side member) 21 case main body 23 through hole 28 O-ring pressing part (elastic member pressing part) 29 recess 30 rotator 31 rotator main body 34 movable contact pattern 33 O-ring housing part (Elastic member storage part) 35 Projection 50 Slider fixing plate 53 Slider 80 Bottom plate 95 O-ring (elastic member) A O-ring protrusion prevention part (elastic member protrusion prevention part)

Claims (3)

[Claims] An elastic member is provided between an upper surface or a lower surface of a rotating body and a fixed side member so as to be crushed.
A torque generating mechanism for a rotating body, which generates a predetermined torque for rotation of the rotating body. 2. The elastic member is ring-shaped, and has an elastic member storage portion provided on at least one of the surfaces of the rotating member and the fixed member that crush the elastic member, and an outer periphery of the elastic member storage portion. 2. The torque output mechanism for a rotating body according to claim 1, wherein an elastic member protrusion prevention portion is provided on the side. 3. The elastic member pop-out preventing portion is configured by engaging a protrusion provided on one of the rotating body and the fixed side member with a concave portion provided on the other. A torque output mechanism for a rotating body as described in the above.