JPH06294414A - Shaft locking device - Google Patents

Abstract

PURPOSE:To obtain a stabilized torque by attaching friction plates to a pivot- shaft of members to be turned so that they can move in the axial direction with their rotation restricted. CONSTITUTION:For example, when a shaft locking device is applied to the pivot-shaft of a panel display of a word processor, the fixing part 2d of a fixing member 2 is fixed to a device body through screw holes 2c, and the connecting part 3d of a rotary shaft 3 is connected and attached to the panel display. In such an example, for the shaft locking device 1, when the tilt angle of the panel display is adjusted, the rotary shaft is turned integrally with the panel display, and friction plates 4, 5, a disc spring 7, and a cap plate 6 are turned together with the rotary shaft 3. Thus, since friction producing surfaces of the shaft locking device 1 are limited to the surfaces on which the respective friction plates 4 and 5 abut against a bearing part 2b, and further the surface pressures and areas of the friction producing surfaces are not changed even when the rotary shaft 3 is rotated, generated torque of the shaft locking device 1 is stabilized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a member such as a laptop or notebook type word processor, a panel display such as a personal computer, or an opening / closing part such as a lid of a mechanical device, which is required to adjust an inclination angle. Axis locking device

[0002]

2. Description of the Related Art A conventional axis lock device 100 of this type is attached to a pivot support portion A of a panel display 201 of a word processor as shown in FIG. As shown in FIGS. 12 and 14, the shaft locking device 100 at this time is a fixing member 101 fixed to the device main body 200, rotatably supported by the fixing member 101, and integrally connected to the panel display 201. Rotating shaft 102,
The rotating shaft 102 is arranged on both sides of the fixing member 101.
Friction plates 103 and 104 that are rotatably supported by a disc spring 106 as a pressing member that is disposed between the friction plates 104 and the pressing plate 105 and that is rotatably supported by the rotating shaft 102. And the front end portion of the rotary shaft 102 is swaged 102a (see FIG. 14) to constitute the whole.
In this shaft lock device 100, the flange portion 102b of the rotary shaft 102 and the friction plate 103, the friction plate 103 and the fixing member 101, the fixing member 101 and the friction plate 104, and the friction plate 104 are included.
Grease is applied between the disc spring 106, the disc spring 106, and the pressing plate 105.

Such a conventional shaft locking device 100 is
When used in the pivot A of the panel display 201 shown in FIG. 13, the disc spring 106 pressurizes a frictional force between each grease application, and this frictional force keeps the panel display 201 at an arbitrary inclination angle. Has become.

[0004]

However, in the conventional shaft lock device 100, the friction plate 103 is attached to the rotary shaft 102.
Since and 104 are rotatably attached, when the frictional force (torque) is generated on the rotating shaft 102, the surface on which the frictional force is generated is not fixed, and the torque becomes unstable.

That is, the conventional shaft locking device 100 is
The friction generating surface is only between the flange portion 102b and the friction plate 103, between the flange portion 102b and the friction plate 103, between the fixing member 101 and the friction plate 104, or between the fixing member 101 and the friction plates 103 and 104. Or between the flange portion 102b and the friction plate 103, between the fixed member 101 and the friction plate 104, and between the holding plate 105 and the disc spring 106. Since it changes depending on the change in pressure and the friction coefficient of grease, the fluctuation range of torque becomes large. As described above, in the conventional shaft lock device 100, the fluctuation amount of the initial torque value becomes large depending on the number of times of operation and the conditions when the operation time is earlier or later than the initial torque value.

Further, in the conventional shaft lock device 100, a lubricant (such as grease) is applied to each friction generating surface, but the grease is pushed out from the friction generating surface by the pressing force of the disc spring 106, and the rotary shaft is rotated. There is also a problem that the torque generated in 102 becomes unstable and the torque declines in long-term use.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to provide a shaft lock device capable of obtaining a stable torque.

[0008]

In order to achieve the above-mentioned object, the present invention provides a shaft locking device for holding a rotated member at an arbitrary inclination angle by using a friction plate and a pressing member. Is attached to the pivot shaft of the rotated member so as to be axially movable while being restrained from rotating.

Further, according to the present invention, a lubricant may be applied to the friction generating surface of the friction plate.

Further, according to the present invention, a lubricant holding portion may be formed on the friction plate and / or the contact member of the friction plate.

[0011]

Since the present invention has the above-described structure, the friction generating surface is always constant between the friction plate and the abutting member of the friction plate and is not changed, so that the generated friction torque is stable. To do.

Further, in the structure in which the lubricant is applied to the friction generating surface of the friction plate, the abrasion of the friction generating surface with improved lubrication performance is prevented and stable friction torque is produced.

Further, in the structure in which the lubricant holding portion is formed on the friction plate and / or the abutting member of the friction plate, the lubricant is held on the friction plate or the abutting member even if the pressing force of the pressing member becomes high. Since it is not pushed out from the friction generating surface, the generated friction torque can be maintained and stabilized for a long period of time.

[0014]

The present invention will be described in detail below with reference to the illustrated embodiments. 1 and 2 show a shaft lock device 1 as a first embodiment of the present invention. This axis lock device 1
The fixed member 2, the rotary shaft 3 rotatably supported by the fixed member 2, the friction plates 4 and 5 arranged so as to sandwich the fixed member 2 and attached to the rotary shaft 3 so as to rotate integrally. And a disc spring 7 as a pressing member which is disposed between the friction plate 5 and the pressing plate 6 and attached to the rotating shaft 3. The fixing member 2 has a circular bearing hole 2a.
Is formed by an L-shaped member having a bearing portion 2b having a hole formed therein and a fixed portion 2d having a screw hole 2c formed therein. Rotating shaft 3
Is a shaft body composed of a large-diameter shaft portion 3a and a small-diameter shaft portion 3b cut in parallel. The large-diameter shaft portion 3a and the small-diameter shaft portion 3 are formed.
A flange portion 3c is formed at a step with b, and a connecting portion 3d to the rotated member is formed at the end of the large-diameter shaft portion 3a by being cut in parallel. The rotary shaft 3 is rotatably attached to the fixed member 2 by inserting the small diameter shaft portion 3b into the bearing hole 2a.

The friction plates 4 and 5 are formed of a disk body having an outer diameter substantially equal to that of the flange portion 3c, and an oval through hole 4 corresponding to the cross-sectional shape of the small diameter shaft portion 3b is formed in the central portion thereof.
a and 5a are provided. The friction plates 4 and 5 are arranged on both sides of the bearing portion 2b and the through holes 4a and 5 are formed.
The small-diameter shaft portion 3b is attached to a through. The friction plates 4 and 5 thus mounted are restrained from rotating with respect to the small-diameter shaft portion 3b and are movable in the axial direction. Therefore, the friction plates 4 and 5 rotate together with the rotary shaft 3.
Further, the holding plate 6 is composed of a disc body having an outer diameter substantially equal to that of the flange portion 3c, and the small diameter shaft portion 3b is provided at the center thereof.
A through hole 6a corresponding to the cross-sectional shape is formed, and the through hole 6a is attached to the rotary shaft 3 by being externally inserted into the small diameter shaft portion 3b. Therefore, the holding plate 6 is attached to the rotary shaft 3 so as to be rotationally restrained and axially movable, and rotates integrally with the rotary shaft 3.

Further, the disc spring 7 is arranged between the friction plate 5 and the pressing plate 6, and is attached to the circular hole 7a at the center thereof through the small diameter shaft portion 3b. After the friction plates 4, 5, the disc springs 7, and the holding plate 6 are thus passed through the small-diameter shaft portion 3b, the tip end portion of the small-diameter shaft portion 3b protruding outward of the holding plate 6 located on the outermost side. The shaft locking device 1 is provided by caulking 8 (see FIG. 2) to prevent the rotary shaft 3 from coming off.
Is assembled. This shaft lock device 1 includes friction plates 4
Grease as a lubricant is applied to the contact surfaces between the bearings 5 and 5 and the bearing portion 2b.

The shaft lock device 1 having the above-described structure is used by being attached to the pivot portion of the rotated member as in the conventional shaft lock device 100. For example, when the axis lock device 1 is applied to the pivot portion of the panel display of the word processor shown in FIGS. 13 and 14, the conventional axis lock device 1 is used.
Similarly to 00, the fixing portion 2d of the fixing member 2 is fixed to the apparatus main body through the screw hole 2c, and the connecting portion 3d of the rotating shaft 3 is connected and attached to the panel display. In such a usage example, the shaft lock device 1 rotates the rotary shaft 3 together with the panel display when adjusting the tilt angle of the panel display, and the friction plates 4 and 5, the disc springs 7, and the holding plate 6
Rotate integrally with the rotating shaft 3. Therefore, the friction generating surface of the shaft locking device 1 is limited to the contact surface between the friction plates 4 and 5 and the bearing portion 2b, and the surface pressure and area of the friction generating surface are the same as those of the rotating shaft 3.
The torque generated by the shaft lock device 1 is stable because it does not change due to rotation of the shaft lock device 1. Thus, the axis lock device 1
With the lubrication performance of the grease applied to the friction generating surface, an excessive operating force can be avoided, and the stable generated torque can securely hold the panel display at an arbitrary inclination angle.

FIG. 3 and FIG. 4 show a shaft lock device 10 as a second embodiment. This shaft locking device 10 is the same as the above-described shaft locking device 1 except that the retaining means for the rotating shaft 3 is different.
Since it has the same configuration as the above, the same components are designated by the same reference numerals and the duplicate description will be omitted. The shaft lock device 10 prevents the rotary shaft 3 from coming off by screwing a nut 9 into the small diameter shaft portion 3b. Therefore, the small diameter shaft portion 3b
A screw thread 3e with which the nut 9 is screwed is engraved on the.
That is, the shaft lock device 10 has the friction plates 4 and 5, the disc springs 7, and the holding plate 6 attached to the small-diameter shaft portion 3b of the rotating shaft 3 rotatably supported by the fixing member 2, and the holding plate located on the outermost side. 6, the nut 9 is attached to the tip of the small-diameter shaft portion 3b protruding outward.
It is assembled by screwing. This shaft lock device 10 also operates similarly to the shaft lock device 1 described above.

5 and 6 show a lubricant holding type shaft lock device, FIG. 5 shows a shaft lock device 20 as a third embodiment, and FIG. 6 shows a shaft lock device 30 as a fourth embodiment. Show. The shaft locking devices 20 and 30 have the same configuration as the shaft locking device 1 described above except that a lubricant holding portion is formed, and therefore, the same components are denoted by the same reference numerals and duplicate description will be omitted. The shaft lock device 20 includes the friction plate 4
A holding hole 21 as a lubricant holding portion is formed in each of 5 and 5. The holding holes 21 are formed into a round shape (circular shape or elliptical shape) or a rectangular shape, and the number of the holding holes is four in this embodiment.
The number is not limited to one, and one or a plurality of five or more can be provided. Further, in the shaft lock device 30, a cutout groove 31 as a lubricant holding portion is formed in the bearing hole 2a of the fixing member 2. In the present embodiment, two notch grooves 31 are provided at symmetrical positions, but the present invention is not limited to this, and one or three or more may be provided. In the shaft lock devices 20 and 30, since the grease is held in the holding hole 21 and the notch groove 31 without being pushed out from the friction generating surface even if the pressing force of the disc spring 7 becomes high, the lubricating performance is stable and the rotary shaft The torque generated in 3 can be maintained for a long period of time and is stable.

Next, the above-mentioned shaft lock devices 1, 10, 2
It will be described because 0 and 30 confirmed that the generated torque is more stable than the conventional shaft lock device 100 by the durability test. The durability test was performed by connecting a rotary shaft to a pneumatic rotary actuator (rotary actuator), fixing a fixing member, and rotating the rotary shaft. The operating angle of the rotating shaft at this time is set to 180 ° which is a general product use angle, and the rotating shaft is set within 2 ° within the operating angle.
The reciprocating operation was repeated at a rate of 0 reciprocation / minute. Then, the torque of the shaft locking device was measured after the shaft locking device was left at room temperature for about 1 hour after the specified number of times. Graphs shown in FIGS. 7 to 9 were obtained from the durability test data at this time. That is, FIG. 7 shows a conventional shaft locking device 100, and FIG.
Shows the durability test data of the shaft lock devices 1 and 10 (the shaft lock device of the present invention), and FIG. 9 shows the durability test data of the shaft lock devices 20 and 30 (the lubricant holding type shaft lock device of the present invention).

From these test data, it is understood that the shaft locking device of the present invention and the lubricant holding type shaft locking device have a smaller fluctuation range of the torque than that of the conventional shaft locking device, and a stable torque can be obtained. In the shaft lock device of the present invention, as shown in FIG. 8, the torque value decreases depending on the number of times of operation. The surface pressure causes the grease to be pushed out to the periphery of the friction plates 4 and 5, so that the oil film becomes thin and the friction surface becomes worn and This is because the pressure drops. Further, particularly in the lubricant retaining type shaft locking device of the present invention, the grease retained in the retaining hole 21 or the notch groove 31 causes the fixing member 2 to rotate at the same time as the rotation of the rotating shaft 3.
And / or it is applied to the friction plates 4 and 5, and then the friction plates 4 and 5 come into contact with each other, so that a sufficient lubrication effect can be obtained, and stable torque can be obtained with a small decrease in torque even at a high operation frequency.

The present invention is not limited to the embodiments described above, but includes the following modifications. Figure 10
The shaft locking device 40 shown in (1) is the same as the shaft locking device 1 described above except that the shaft locking device 40 is attached to an applicable member. That is, the axis locking device 40
Is a rotary member 41 in which members corresponding to the fixed member 2 and the rotary shaft 3 of the shaft lock device 1 are fixed to the panel display 201, and the fixed shaft 4 attached to the main body 200.
It is 2.

A shaft locking device 50 shown in FIG. 11 is a further modified example of the shaft locking device 40, and is a flat plate-shaped rotating member 5.
The structure is the same as that of the shaft lock device 40 except that 1 is used.

In these shaft lock devices 40 and 50, the friction plates 4 and 5 are attached to the fixed shaft 42 so as to be rotatable and axially movable, and the rotary members 41 and 51 that rotate integrally with the display 201. Friction torque is generated between the and.

The holding hole 21 may be formed in the fixed member 2, or may be formed in both the friction plates 4, 5 and the fixed member 2. Further, the retaining means for the rotating shaft 3 may be an E ring fitted to the tip of the small diameter shaft portion 3b. Further, as the pressing member, a coil spring, a leaf spring, a corrugated washer or the like can be used in addition to the disc spring 7, and the number of sheets to be used is not limited to one sheet, but a plurality of sheets can be used in piles according to the required torque. .

[0026]

As described above, according to the present invention, since the friction plate is assembled so as to rotate integrally with the rotary shaft, the friction generating surface does not change, and it always becomes the contact surface between the friction plate and the fixing member. Since the surface pressure and the area are always constant, it is possible to provide a shaft locking device with stable generated torque. Further, in the shaft lock device provided with the lubricant holding portion of the present invention, the lubricant is held in the holding portion without being pushed out from the friction plate by the pressing force of the pressing member, so that it can be used for a long time. Lubricating performance is maintained, torque is not reduced, and stable torque can be obtained.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a shaft locking device of the present invention.

FIG. 2 is a vertical cross-sectional view of an assembled state of the shaft locking device of FIG.

FIG. 3 is an exploded perspective view of the shaft locking device of the present invention.

FIG. 4 is a vertical cross-sectional view of an assembled state of the shaft locking device of FIG.

FIG. 5 is an exploded perspective view of the shaft locking device of the present invention.

FIG. 6 is an exploded perspective view of the shaft locking device of the present invention.

FIG. 7 is a graph showing durability test data of a conventional shaft locking device.

FIG. 8 is a graph showing durability test data of the shaft locking device of the present invention.

FIG. 9 is a graph showing durability test data of the shaft locking device of the present invention.

FIG. 10 is a partially cutaway side view showing a usage state of the shaft locking device of the present invention.

FIG. 11 is a partially cutaway side view showing a usage state of the shaft locking device of the present invention.

FIG. 12 is an exploded perspective view of a conventional shaft locking device.

FIG. 13 is a perspective view showing a usage state of a conventional shaft locking device.

FIG. 14 is a side view of the main part of the use state of FIG. 11 partially broken away.

[Explanation of symbols]

 1, 10, 20, 30, 40, 50 Shaft lock device 2 Fixing member 3 Rotating shaft (pivot shaft) 4,5 Friction plate 7 Disc spring (pressurizing member) 21 Holding hole (lubricant holding portion) 31 Notch groove (Lubricant holding portion) 41 Rotating member 42 Fixed shaft (pivot shaft) 51 Rotating member 200 Main body 201 Panel display (rotated member)

Claims (3)

[Claims] 1. A shaft lock device for holding a rotated member at an arbitrary inclination angle by using a friction plate and a pressing member, wherein the friction plate is restrained from rotating by a pivot shaft of the rotated member. A shaft lock device which is mounted so as to be movable in the axial direction. 2. The shaft lock device according to claim 1, wherein a lubricant is applied to a friction generating surface of the friction plate. 3. The shaft lock device according to claim 1, wherein a lubricant holding portion is formed on the friction plate and / or the abutting member of the friction plate.