JP2879473B2 - Slow rotation shaft device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slow rotating shaft device that rotatably supports a second member that rotates relative to a first member.

This slowly rotating shaft device is used for a pivot portion of an opening / closing device such as a compact case for makeup, a radio cassette, or a dashboard of an automobile.

2. Description of the Related Art As shown in FIG. 7, this kind of slowly rotating shaft device includes a shaft 3 that rotatably supports a rotating member 1 that rotates relative to a fixed member 2.

As shown in FIGS. 8 and 9, the shaft body 3 includes a hollow shaft body 31, cap members 32 and 33 rotatably inserted on both sides of the shaft body 31, and a one-end hook portion 41. The torsion bar 4 having the other end hook portion 42 engaged within the cap member 33, the shaft main body 31 and the cap member 32.
, And viscous grease (not shown) enclosed between 33.

The shaft body 31 is provided with cap members 3 on both sides of the central large-diameter shaft portion 31a.
A small-diameter shaft portion 31b for rotatably extrapolating 2, 2 and 33 is formed with a stepped shaft body, and a slit-shaped through hole 34 is formed in the length direction, and a large-diameter shaft is formed. Part 31a
Is formed with a key 35 protruding therefrom. Cap member 32 and
33 has a bottomed cylindrical body whose inner diameter is substantially the same as the outer diameter of the small-diameter shaft portion 31b, and whose outer diameter is substantially the same as the outer diameter of the large-diameter shaft portion 31a. And 38 are protruded.

At the bottom of one of the cap members 33, a slit-shaped recess is provided.
36 are formed. The cap members 32 and 33 are externally inserted into the small-diameter shaft portions 31b and 31b, and the annular grooves 32a and 33a of the cap members 32 and 33 are formed in the annular ribs 31c of the small-diameter shaft portions 31b.
The shaft body 31
It is rotatably assembled to

In this assembled state, the torsion bar 4 is
31 is inserted into the through-hole 34, one end hook part 41 is engaged with the through-hole 34, and the other end hook part 42 is a cap member.
The viscous grease is sealed between the cap members 32 and 33 and each of the small-diameter shaft portions 31b.

As shown in FIG. 10, the shaft body 3 assembled as described above is provided with a key provided at each of the shaft support portions of the rotating member 1 and the fixed member 2 by raising the rotating member 1 by 90 ° with respect to the fixed member 2. The groove (not shown) is inserted into the shaft support portion by aligning the grooves. By this insertion, the shaft body 3 becomes the large diameter shaft portion 31 of the shaft body 31.
a is located in the bearing portion 21 of the fixed member 2, and the cap members 32 and 33 are located in the shaft supports 11 and 12, respectively, of the rotating member 1, and the keys 35, 37, and 38 are connected to the bearing portion 21,
The large-diameter shaft portion 31a is fitted to the bearing portion 21 and the cap members 32 and 33 are fitted to the shaft support portions 11 and 12, respectively, so that the large-diameter shaft portion 31a is fitted into key grooves (not shown) formed in the shaft support portions 11 and 12, respectively. Mounted.

In the conventional slow-rotating rotating shaft device configured as described above, the rotating member 1 is rotated from the neutral point b in the closing direction, so that the jumping torque is accumulated in the torsion bar 4, and the jumping torque is maximized. At the fully closed point a, the rotating member 1 is fixed to the fixing member 2 using an appropriate locking means (see FIG. 10). For this reason, when the locking means is released, the rotating member 1 rotates in the opening direction due to the flip-up torque of the torsion bar 4. At this rotation, shear resistance of viscous grease is generated, and the torque load of the torsion bar 4 is also reduced. Regardless, it can rotate at a slow speed and stop at the neutral point b.

Thus conventional slower rotational shaft device achieves a for slow operation in alpha ₁ range up neutral point b from all closed point a of the rotating member 1, as shown in Figure 10.

[Problem to be Solved by the Invention] In such an opening and closing device, as shown in FIG. 10, the maximum rotation angle α of the rotating member 1 is set to approximately 135 °, and the neutral point b
Rotating member 1 alpha ₂ zone to a fully open point c there is a desire like to free stop region which can be stopped at any position from. In this case, the above-mentioned demand cannot be achieved by using the above-mentioned conventional slow rotating shaft device.

That is, when the rotary member 1 from the neutral point b to the fully open point c, the torsion bar 4 in the shaft 3 is twisted in the opposite direction to the time of the closing rotating in alpha ₁ domain described above, the torsion bar 4
Torque is accumulated in the motor. The accumulated torque acts to overcome the shear resistance of the viscous grease and return the rotating member 1 toward the neutral point b, so that the rotating member 1 cannot be stopped at an arbitrary position.

Also, an initial torque is applied to the torsion bar 4 to make α ₁
In ₂ zone alpha when the entire area of the band and alpha ₂ region to rotate the rotary member 1 by torque of the torsion bar 4 coincides with the acting direction of the torque of the rotational moment and the torsion bar 4 of the rotary member 1 is viscous grease The rotation member 1 cannot be stopped at an arbitrary position only by the shear resistance.

Moreover, the torsion bar 4 are limited in torsional direction in use by setting process, the durability of the torsion bar 4 is lowered caused a permanent set when the rotation angle of the alpha ₂ domain becomes large, also has the problems referred to.

The present invention has been made in view of the circumstances described above,
The purpose of this is a slow rotating shaft device used for a pivotal portion of a switchgear in which the rotation angle of the rotating member exceeds a neutral point, and in a rotation range within the neutral point, the rotating member is loosened by the torsion bar flip-up torque. It is an object of the present invention to provide a slow-moving rotary shaft device which can be rotated at a speed and can be set in a free stop region in which a rotary member can be stopped at an arbitrary position in a rotation range exceeding a neutral point.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention relates to a structure in which a shaft that rotatably supports a second member that rotates relative to the first member is related to the first member. A combined hollow shaft main body, a cap member rotatably inserted at the end of the shaft main body and engaged with the second member, and a cap member having one end engaged with the shaft main body and the other end connected to the cap member. A torsion bar engaged with
It consists of viscous grease sealed between the shaft main body and the cap member, and one of the hollow shaft main body and the cap member is non-rotatably engaged, and the other is engaged with an idle space. It is characterized by being.

[Operation] The shaft body and the cap member are integrated with the first and second members, respectively, and one of the first and second members is rotated about the pivotal support portion with respect to the other member. I do. This rotation occurs over the torsional bar in the positive and negative torsional regions.

In this case, the relative rotation of the first or second member in the forward torsion region is performed by the torque of the torsion bar. Despite this torque load, the shear resistance of the viscous grease sealed between the shaft body and the cap member is reduced. The speed becomes slower.

In addition, the relative rotation of the first or second member in the initial region where the torsion bar is converted from the positive torsion to the negative torsion is not affected by the external force. 1
This operation is performed within the idling area for the member of the above. The rotated member in this region also has a small rotational moment, and stops at an arbitrary position due to friction of the pivotal portion and shear resistance of viscous grease when the external force load is released.

Further, the relative rotation of the first or second member in the negative torsion region of the torsion bar beyond the idling region is performed while the torsion bar is twisted in the negative direction by an external force load. When the external member in this area releases the external force load on the member, the resultant force of the rotational moment of the rotational member and the shear resistance of the viscous grease balances with the torque of the torsion bar and stops the rotational member at an arbitrary position. Can be done.

As described above, since the relative rotation of the first or second member in the negative torsion region of the torsion bar is performed through the idling region, the torsion angle of the torsion bar in the negative direction can be reduced, and The entire negative torsional area can be a free stop area in which the rotated member can be stopped at an arbitrary position by releasing the external force.

[Examples] Hereinafter, the present invention will be specifically described based on illustrated examples.

In this embodiment, the same elements as those of the conventional example will be denoted by the same reference numerals.

In FIGS. 1 and 2, a shaft body 3 of the present embodiment includes a hollow shaft body 31 and a shaft body 31 similar to the above-described conventional shaft body.
Cap members 32 and 33 rotatably extrapolated on both sides of the
And a torsion bar 4 having one end hook portion 41 engaged in the shaft body 31 and the other end hook portion 42 engaged in the cap member 33.
And the viscous grease 5 enclosed between the shaft main body 31 and the cap members 32 and 33.

The shaft body 31 is provided with cap members 3 on both sides of the central large-diameter shaft portion 31a.
A small diameter shaft portion 31b for rotatably extrapolating 2 and 33 respectively and
31b is formed with a stepped shaft body. The shaft main body 31 has a through hole formed of a slit-like hole 34a opening at one end side and a circular hole 34b communicating with the slit-like hole 34a and opening at the other end side, and a large-diameter shaft portion. A key 35 is formed outside 31a.

The cap members 32 and 33 are provided with a small-diameter shaft portion 31b of the shaft main body 31.
The cap member 33 is provided with a slit-shaped recess 36 at the bottom thereof.

The outer diameters of the cap members 32 and 33 are formed to be the same as the large-diameter shaft portion 31a of the shaft main body 31, and keys 37 and 38 are formed on the outside.

Then, the cap members 32 and 33 are connected to the respective small diameter shaft portions 31b and 31b.
Are rotatably assembled to the shaft main body 31 by extrapolating to the shaft body 31 respectively.

The viscous grease 5 is applied to the outer surfaces of the small diameter shaft portions 31b and 31b at the time of the extrapolation of the cap members 32 and 33, and the cap members 32 and 33 and the small diameter shaft portions 31b, 31b.

In this assembled state, the torsion bar 4 is attached to the shaft body 31.
And the other end hook portion 41 is engaged with the slit-shaped hole 34a, and the other end hook portion 42 is
And is engaged with the slit-shaped recess 36 of the cap member 33 and assembled in the shaft 3.

The shaft body 3 assembled in this manner is attached to the pivot of the opening / closing device 60 shown in FIG. 3 to form a slow rotating shaft device.

The opening / closing device 60 is configured such that the rotating member 1 is
It is supported so that it can rotate around. The rotating member 1 is formed at one end face with a shaft support portion 11 through which the shaft body 3 can be inserted.
The upper surface of the shaft support 11 is formed as a tapered surface 12, and a stopper surface 13 is formed on the top end surface of the tapered surface 12.

Bearings 21 and 22 are formed on the fixed member 2 so as to sandwich the shaft support 11 of the rotating member 1, and a stopper surface 13 of the rotating member 1 is formed on an end face on the formation side of the bearings 21 and 22.
Abutment surface 23 is formed.

For this reason, in the opening / closing device 60, the rotating member 1 is brought into contact with the contact surface 23 through the neutral point in FIG. 4 (a) which stands substantially vertically from the fully closed state in FIG. 3 (c). FIG. 4B shows the fully opened state in which the rotation is restricted. At this time, the rotation angle α from the fully closed state to the fully opened state of the rotating member 1 is approximately 135 °.

The shaft body 3 is inserted into a pivot portion of the rotating member 1 at a neutral point of the rotating member 1.

That is, as shown in FIG. 4 (a), the rotary member 1 is erected substantially vertically so that the insertion holes and the key grooves provided in the bearing portions 21 and 22 of the fixed member 2 and the shaft support portion 11 of the rotary member 1, respectively. After matching, the shaft body 3 is made to pass through the insertion hole,
Insert the key 37 of the cap member 32 into the keyway of the bearing 22
31 key 35 in the keyway of the shaft support 11 and the cap member 33
By fitting the key 38 into the key groove of the bearing portion 21, the shaft main body 31 and the cap members 32 and 33 are attached to the rotating member 1 and the fixed member 2, respectively. At this time, the key grooves of the bearing portions 21 and 22 integrally formed on the fixing member 2 are formed in a shape corresponding to the keys 37 and 38 of the cap members 32 and 33, and the bearing portions 21 and 22 of the keys 37 and 38 are provided. Of the cap members 32 and 33 into the bearing portions 21 and
It is attached to 22 in a non-rotatable state.

As shown in FIG. 5, the key groove of the shaft support portion 11 of the rotating member 1 corresponds to the key groove formed in the large-diameter shaft portion 31a of the shaft main body 31. (Opening direction 1) of the airbag 1 is formed by bulging a gap portion 7 that can idle. For this reason, the shaft main body 31 (large-diameter shaft portion 31a) in which the key 35 is fitted into the key groove of the shaft support portion 11 is engaged with the shaft support portion 11 while leaving the gap portion 7 as an air gap. Can idle in the gap 7 independently of the shaft body 31.

 Next, the operation of the present embodiment will be described.

When the rotating member 1 is located at the neutral point (FIG. 4A), the state of engagement between the large-diameter shaft portion 31a of the shaft main body 31 and the shaft support 11 of the rotating member 1 is as shown in FIG. The gap portion 7 in the support portion 11 is engaged while leaving a gap.

From this neutral point, the rotating member 1 is closed (direction B in FIG. 5).
When rotated, the shaft main body 31 rotates together with the rotating member 1 in the direction C shown in FIG. 2 (c). Due to the rotation of the rotating member 1 in the closing direction, the torsion bar 4 is twisted in the forward direction, and energy for rotating the rotating member 1 in the opening direction is accumulated.
Then, a fully closed state shown in FIG. In the fully closed state, the rotating member 1 is maintained in the fully closed state by an appropriate locking means (not shown).

When the lock of the rotating member 1 in the fully closed state is released, the rotating member 1 rotates in the opening direction by the torque of the torsion bar 4. The rotation at this time causes shear resistance of the viscous grease, and the rotation is performed at a slow speed regardless of the torque load of the torsion bar 4. Then, the rotating member 1 stops near the neutral point in FIG. 4 (a). Subsequent rotation of the rotating member 1 in the opening direction is performed manually.

First, an external force is applied to the rotating member 1 stopped near the neutral point to further rotate in the opening direction. This rotation is the rotation of the rotating member 1 in the direction A shown in FIG. 5, and the rotating member 1 idles in the gap 7 of the shaft support 11, and the regulating wall 7a of the gap 7
This idling is restricted by contacting the key 35 as shown by the two-dot chain line in the figure. Since the rotation of the rotating member 1 does not accompany the rotation of the shaft main body 31, the torsion bar 4 is in a no-load state without being twisted at all, and the rotating member 1 is moved to an arbitrary position by releasing the external force. Can be stopped. This is the rotation angle α ₃ of the rotating member 1.
Is approximately 30 ° and the rotational moment of the rotating member 1 is small, so that the rotation of the rotating member 1 can be stopped only by the friction between the shaft support 11 and the large-diameter shaft 31a.

Further, an external force is applied to the rotating member 1 to rotate the rotating member 1 in an opening direction (A direction in FIG. 5) to bring the rotating member 1 to a fully opened state (FIG. 4B). This fully opened state is shown by a three-dot chain line in FIG. During this time, the rotation of the rotating member 1 causes the shaft main body 31 to move to the second
The rotation of the torsion bar 4 is performed in the negative direction opposite to the rotation of the rotating member 1 in the closing direction, with the rotation in the direction D in FIG. It can be stopped at any position. This the rotation angle alpha ₄ of the rotary member 1 is located ° approximately 15, not the torque to the torsion which corresponds to the rotation angle returns to the neutral point a rotational member 1 even if they are added to the torsion bar 4 The reason is that the torque can balance the rotational moment of the rotating member 1 and the resultant force of the shearing resistance of the viscous grease to stop the rotating member 1 at an arbitrary position.

At this time, the torsion angle of the torsion bar 4 in the negative direction is reduced, so that the torsion bar 4 is not settled by the torsion in the negative direction.

As described above, in the present embodiment, the open rotation area after the neutral point of the rotary member 1 can be set as the free stop area.

 Next, another embodiment will be described.

Another embodiment is a case where the opening and closing device is different from the above embodiment.

In this example, the shaft 3 is attached to the pivot of the opening / closing device 6 described in the prior art. In this case, the cap members 32 and 3 are used.
Reference numeral 3 designates a shaft body 31 and a shaft support portion 11 and 12 of the rotating member 1, respectively.
Are attached to the bearing portions 21 of the fixing member 2, respectively. At this time, the keyway of the bearing portion 21 formed in the fixing member 2 is
The shaft main body 31 is attached to the bearing 21 in a non-rotatable state by fitting the key 35 into the key groove of the bearing 21.

As shown in FIG. 6, the key groove corresponding to the key 38 of the cap member 33 is inserted into the key groove of the one shaft support portion 11 formed in the rotary member 1 in the direction A (the opening direction of the rotary member 1). ) Is formed by bulging a gap portion 7 that can idle. For this reason, the cap member 33 in which the key 38 is fitted into the key groove of the shaft support portion 11 leaves the space 6 as a space, and
Attached to

Further, the key groove of the other shaft support 12 may be formed in a shape corresponding to the key 37 of the cap member 32, and a void may be formed in the key groove of the shaft support 12 similarly to the above-described shaft support 11. Alternatively, it may be formed. In the former case, the cap member 32 is
The cap member 32 is attached to the shaft support 12 in the latter case while leaving the gap of the shaft support 12 as an air gap. The latter mounting condition is the shaft body shown in FIG.
This is the same as the attachment state of the 31 (large-diameter shaft portion 31a) and the shaft support portion 11.

This embodiment, shaft support 11 without any twisting that rotational member 1 is a torsion bar 4 is in alpha ₃ regions shown in FIG. 5
It idles the gap portion of the inner, in the alpha ₄ regions rotary member 1 is rotated in the opening direction while twisting the torsion bar 4 in the negative direction is accompanied with rotation of the cap member 33. At this time, the free stop the alpha ₃ domain shear resistance of the viscous grease 5 sealed between the small diameter portion 31b of the cap member 32 and the shaft body in the case where the cap member 32 is attached in a non-rotatable state to the shaft supporting portion 12 In the case where the cap member 32 is obtained by the frictional force between the cap member 33 and the shaft support portion 11 and is attached to the shaft support portion 12 while leaving the gap, the cap members 32 and 33 and the respective shaft support portions 12 and 11 Obtained by the frictional force generated between

The free stop of alpha ₄ region is obtained in the same manner as in the embodiment described above.

Incidentally, may be sealed viscous grease this case between the cap member 32 and 33 and the shaft supporting portion 12 and 11 in the present embodiment, the free stop the alpha ₃ domain utilizing shear resistance of the viscous grease Can be.

As described above, also in this embodiment, the torsion bar 4 is twisted in the negative direction after the rotating member passes through the idling region, so that the torsion angle of the torsion bar 4 in the negative direction is reduced,
No settling of the torsion bar 4 occurs.

[Effects of the Invention] As described above, according to the present invention, the rotating member that rotates with respect to the fixed member is rotated from the fully closed state to the neutral point at a slow speed by the spring force of the torsion bar and the shear resistance of the viscous grease. In addition to this, the open rotation area after the neutral point where the torsion bar is twisted in the negative direction can be used as the free stop area, so that it is possible to provide an easy-to-use opening / closing device.

In the opening direction rotation region after the neutral point, the torsion bar is twisted in the negative direction through the idling region, so that the torsion angle is small enough not to cause settling of the torsion bar and the original durability is reduced. Can be maintained.

[Brief description of the drawings]

FIG. 1 shows a shaft constituting a slow rotating shaft device according to the present invention, wherein FIG. 1 (a) is a longitudinal sectional view, FIG. 1 (b) is a left side view thereof, and FIG. (A) is a sectional view taken along the line aa, and (b) is a sectional view taken along the line bb.
(C) is a cross-sectional view taken along the line c-c, FIG. (D) is a cross-sectional view taken along the line d-d, and FIG.
FIG. 3 is a sectional view taken along a line, FIG. 3 shows an opening / closing device to which the shaft body is attached, FIG. 3A is a front view thereof, and FIGS.
Fig. 4 shows the operation of the opening and closing device, Fig. 4 (a) is a side view of the neutral point state, Fig. 4 (b) is a side view of the fully opened state, and Fig. 5 is Fig. 4. FIG. 6 is a side view of another embodiment corresponding to FIG. 4 (a), and FIG. 7 is a perspective view of an opening / closing device using a conventional slow rotating shaft device. Fig. 8 is an exploded longitudinal sectional view of a shaft constituting the slow-rotating rotary shaft device, Fig. 9 (a) is a right side view of one cap member of the shaft, and Fig. 9 (b) is 9 (c) is a left side view of the other cap member of the shaft, and FIG. 10 is a side view showing the operation of the opening / closing device. DESCRIPTION OF SYMBOLS 1 ... Rotating member (2nd member), 2 ... Fixed member (1st member), 3 ... Shaft, 4 ... Torsion bar, 5 ... Viscous grease, 6,60 ... Opening / closing device, 7: void portion, 31: hollow shaft body, 32, 33: cap member, 41: one end hook portion, 42: other end hook portion.

Claims (1)

(57) [Claims] A shaft member rotatably supporting a second member which rotates relative to the first member; a hollow shaft body engaged with the first member; and an end portion of the shaft body. It is extrapolated rotatably and the second
A torsion bar having one end engaged with the shaft body and the other end engaged with the cap member, and viscous grease sealed between the shaft body and the cap member. A slow rotating shaft device, wherein one of the hollow shaft main body and the cap member is non-rotatably engaged, and the other is engaged with an idling gap.