JPH11143565A - Operation shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an operation shaft made of synthetic resin which prolongs service life in comparison with the conventional shaft made of synthetic resin. SOLUTION: This operation shaft 100 which has an attaching part 111 which attaches knob that gives rotational force on one side and a rotational force communicating part 112 which communicates the rotational force on the other side and forms a notch 111b to fix the knob at the part 111 is integrally molded with synthetic resin. A reinforcing means is embedded in at least a part which has the notch 111b in the shaft.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating shaft, and more particularly to an operating shaft used in a brake mechanism that transmits rotation of the operating shaft to a driving member but prevents reverse rotation of the driving member.

[0002]

2. Description of the Related Art Conventional operation shafts include those described in, for example, Japanese Utility Model Publication No. 4-50845 and Japanese Utility Model Application Laid-Open No. 2-127252. FIG. 6 shows the actual Kaihei 2-1.
No. 27252, which shows an example of a conventional product. The operation shaft 10 shown in FIG. 6 is used in the brake mechanism 1 that transmits the rotation of the operation shaft 10 to the driving member 4 but prevents the driving member 4 from rotating in the reverse direction.

Here, the brake mechanism 1 will be described. The brake mechanism 1 is used in a hip support swinging device for a vehicle seat as described in Japanese Utility Model Laid-Open No. 2-127252. A coiled torsion spring 3 having a joining portion 3a at both ends and arranged in close contact with the inside of the brake housing 2, an operating shaft 10 to which a rotational force is applied, and a driving member 4 rotatably attached to the operating shaft 10. Is made up of

FIGS. 7 and 8 are cross-sectional views for explaining the operation of the brake mechanism 1. FIG. As shown in FIGS. 7 and 8, in the brake housing 2, together with the torsion spring 3, the engaging portion 3 a of the torsion spring 3 is engaged from the inside of the engaging portion 3 a, and the operating shaft 10 is interposed through the torsion spring 3. The engaged portion 11 of the operating shaft 10 as a rotational force transmitting portion for transmitting the rotational force of the driving member 4 to the driving member 4, the engaging portion 3 a of the torsion spring 3, and the driving member 4 engaging from outside the engaging portion 3 a. The engaged portion 4a is disposed.

In the brake mechanism 1 described above, when a clockwise or counterclockwise rotational force is applied to the operating shaft 10,
As shown in FIG. 7, the operating shaft 10 has its engaged portion 11 engaged with the engaging portion 3 a of the torsion spring 3, so that the close contact of the torsion spring 3 with the brake housing 2 is reduced. The rotational force of the operation shaft 10 is transmitted to the drive member 4 via the control unit 10 to rotate the drive member 4.

On the other hand, when the driving member 4 tries to reverse, the engaged portion 4a of the driving member 4 engages with the engaging portion 3a of the torsion spring 3, as shown in FIG. The close contact of the torsion spring 3 with the brake housing 2 is enhanced, and the reverse rotation of the driving member 4 is prevented.

An operating shaft 1 used for the brake mechanism 1
6, as shown in FIG. 6, one has a mounting portion 12 for mounting a knob for applying a rotational force, and the other has an engagement portion as a rotational force transmitting portion for transmitting the rotational force. It has a mating portion 11 and a fitting shaft 13 projecting from the engaged portion 11 along the axis and allowing the driving member 4 to be loosely fitted.

A notch 12a for fixing the knob is formed in the mounting portion 12 over the entire circumference in the circumferential direction. Serration part 12b which has been subjected to serration processing and has irregularities along the axial direction
Are formed. In FIG. 6, reference numeral 4b is
3 shows a gear of a driving member.

[0009]

SUMMARY OF THE INVENTION The operating shaft 1 described above
In order to reduce the cost and weight of the brake mechanism 1,
Synthetic resin molded integrally with synthetic resin has already been used. However, a notch 12 to secure the knob
The conventional product made of a synthetic resin having "a" has a problem that the life is inevitably shortened.

Therefore, an object of the present invention is to provide a synthetic resin operation shaft that can have a longer life than conventional synthetic resin products.

[0011]

As means for solving the above-mentioned problems, the invention according to claim 1 has, on one side, a mounting portion for mounting a knob for applying a rotating force, and on the other side, a mounting portion for mounting a knob for applying a rotating force. An operating shaft having a rotational force transmitting portion for transmitting a force, and a cutout for fixing the knob formed on the mounting portion, integrally formed of synthetic resin, at least in a portion having the cutout The configuration in which the reinforcing means is embedded is adopted.

According to the first aspect of the present invention, since the reinforcing means is embedded in at least the portion having the cut, at least the portion having the cut can be reinforced by the reinforcing means.

According to a second aspect of the present invention, there is provided the operating shaft according to the first aspect, wherein the reinforcing means is a metal rod.

Therefore, according to the second aspect of the present invention, at least a portion having a cut can be reinforced with a metal bar.

According to a third aspect of the present invention, there is provided the operating shaft according to the first aspect, wherein the reinforcing means is a bar reinforced with glass fiber.

Therefore, according to the third aspect of the present invention, at least a portion having a cut can be reinforced with a bar reinforced with glass fibers.

According to a fourth aspect of the present invention, there is provided the operating shaft according to the first aspect, wherein the reinforcing means is a bar reinforced with carbon fibers.

Therefore, according to the fourth aspect of the present invention, at least a portion having a cut can be reinforced with a bar reinforced with carbon fibers.

According to a fifth aspect of the present invention, there is provided the operating shaft according to any one of the first to fourth aspects, wherein a hollow portion is formed along the axis during molding. .

When the operating shaft is integrally formed of synthetic resin, the resin injected into the mold and molded is gradually cooled and solidified from the surface of the operating shaft which is a molded product. For this reason, at the time of molding, voids tend to concentrate on the axis of the operation shaft, and nests are likely to occur.

However, according to the fifth aspect of the present invention, since the hollow portion is formed along the axis at the time of molding, when the operation shaft is integrally molded with synthetic resin, nests which are likely to occur at the axis are generated. Can be prevented.

According to a sixth aspect of the present invention, there is provided the operating shaft according to any of the second to fifth aspects, wherein a cross-sectional shape of the bar is a shape other than a circle.

In the case where the rod material as reinforcing means embedded in the operating shaft has a circular cross-sectional shape, when a rotational force is applied to the operating shaft via the knob, the inside of the operating shaft becomes Sliding easily occurs on the outer peripheral surface of the bar.

However, in the invention of claim 6, since the cross-sectional shape of the bar is excluding the circular shape, the operation of the operating shaft via the knob is more difficult than when the cross-sectional shape of the bar is circular. The slip is less likely to occur when a rotational force is applied.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIGS.
FIG. 1 shows an example of a first embodiment in which the inventions of claims 1, 2, 5 and 6 are implemented together, FIG. 1 is a perspective view showing an example of the first embodiment, and FIG. FIG. 3 is a sectional view taken along line XX of FIG. 1, and FIG.
FIG. 4 is a sectional view taken along line -Y.

The operating shaft 100 shown in FIG. 1 is used in a brake mechanism, like the conventional operating shaft 10 shown in FIG. Since the brake mechanism has already been described in the section of the related art, the description thereof will be omitted here.

As shown in FIG. 2, the operating shaft 100 includes an operating shaft body 110 integrally formed of a synthetic resin, and reinforcing means 1 which is a metal rod embedded in the operating shaft body 110.
It consists of 20.

As shown in FIG. 1 and FIG.
0 has, on one side, a mounting portion 111 for mounting a knob 130 for applying a rotational force, and, on the other hand, a rotational force transmitting portion 11 for transmitting the rotational force to a driving member of the brake mechanism.
2 and a cylindrical projection 113 protruding from the rotational force transmitting portion 112 along the axis and rotatably mounting the driving member. A hollow portion 114 extending along the axis is provided inside. Have.

The mounting portion 111 of the operation shaft main body 110 has a notch 111b for fixing the knob 130 formed over the entire circumference in a portion near the end face 111a, and the notch 1
Serration part 111c from 11b to end face 111a
And the outer peripheral surface of the serration portion 111c includes
Irregularities are formed along the axial direction of the operation shaft main body 110.

Although the knob 130 is not shown,
On the inner peripheral surface of the fitting hole in which the serration portion 111c of the operation shaft main body 110 fits, irregularities which engage with the irregularities of the serration portion 111c are formed, and the operation shaft main body 110 is attached to the mounting portion 111 of the operation shaft main body 110. At a part of the portion corresponding to the cut 111b of the mounting portion 111, the cut 111
A groove communicating with b is provided through the groove.

The knob 130 is fixed to the operating shaft 100 by an E-shaped retaining ring that penetrates the concave groove and reaches the cut 111b of the operating shaft main body 110.
The rotational force is applied to the operation shaft 100 by the unevenness engaging with the unevenness of the serration portion 111c.

The hollow portion 114 of the operating shaft main body 110 is formed by the end face 1 of the operating shaft main body 110 when the operating shaft main body 110 is formed.
An opening-side portion formed along the axis of the operation shaft main body 110 from the base 11a to the center of the rotational force transmission portion 112 and having a cross-sectional shape larger than that of the bottom portion of the hollow portion 114 corresponds to the operation shaft. Reinforcing means 1 press-fitted after molding of body 110
Blocked by 20.

As shown in FIG. 3, the reinforcing means 120 has a square cross section with four chamfered corners, and as shown in FIG.
1a through the mounting portion 111 to the bottom end of the cavity portion 114 on the side of the opening, and cuts 111b
And the entire mounting portion 111 of the operation shaft main body 110 is reinforced.

[0034] As shown in FIG.
The hollow portion 114 having a zero cross section has a square cross section. Slight gaps 114a are formed at the four corners between the hollow section 114 and the reinforcing means 120 having a square cross section having four chamfered corners. The cavity 114a communicates the inside of the cavity 114 with the outside.

For this reason, the reinforcing means 120 is inserted into the cavity 114.
When press-fitting the air, the air in the cavity 114 is
It is discharged outside through 14a, and the press-fitting is performed without any trouble.

In the operation shaft 100 described above, the cut 1
Since the entire mounting portion 111 of the operation shaft main body 110 including the base 11b is reinforced by the reinforcing means 120, the life can be extended as compared with a conventional synthetic resin product.

In the operation shaft 100, the operation shaft main body 11
At the time of molding 0, since the hollow portion 114 is formed along the axis, when the operation shaft main body 110 is integrally molded with synthetic resin, it is possible to prevent nests that are likely to occur at the axis, Therefore, it is possible to prevent a decrease in the yield of the operation shaft main body 110 due to the occurrence of the nest, and to improve the yield.

When the reinforcing means 120 embedded in the operation shaft main body 110 has a circular cross-sectional shape, when a rotational force is applied to the operation shaft 100 via the knob 130, the operation shaft main body 110 is rotated. Slippage easily occurs on the contact surface with the reinforcing means 120.

However, in the operating shaft 100, the reinforcing means 12
0 is a square with four corners chamfered, so that when the rotational force is applied to the operation shaft 100 via the knob 130, the slippage is reduced as compared with the case where the cross-sectional shape of the reinforcing means 120 is circular. Is unlikely to occur.

Therefore, in the operating shaft 100, the reinforcing means 12
By 0, not only the bending of the operating shaft 100 but also the torsion of the operating shaft 100 can be reliably performed. As a result, as compared with the case where the cross-sectional shape of the reinforcing means 120 is circular, the operating shaft 100 can have a longer life.

In the operating shaft 100, the reinforcing means 120
Is embedded in the operation shaft main body 110 by press fitting, so that it is easy to cope with a change in the material of the reinforcing means 120.

In the operation shaft 100, the reinforcing means 120
Was a square with four chamfered corners. However, the cross-sectional shape of the reinforcing means 120 may be any shape other than a circle. Therefore, the cross-sectional shape of the reinforcing means 120 is
For example, the shape may be triangular, hexagonal, elliptical, or the like, or may be one in which irregularities are formed on a circular outer periphery, as described later.

By the way, in the operating shaft 100, the reinforcing means 110, which is a metal bar, is pressed into the operating shaft main body 11.
Embedded in 0. However, the press-fitting operation shaft body 11
The reinforcing means embedded in 0 is not limited to a metal bar, but may be a metal plate or a bar or plate reinforced with carbon fiber or glass fiber. is there.

(Second Embodiment) FIGS. 4 and 5 show an example of a second embodiment in which the first, fourth and sixth aspects of the present invention are implemented together. FIG. FIG. 5 is a sectional view similar to FIG. 2 showing an example of the embodiment, and FIG. 5 is an end view showing a reinforcing means in FIG. 4. Note that, in the following description of the second embodiment, the description overlapping with the description of the first embodiment will be omitted.

As shown in FIG. 4, in the operating shaft 200, the reinforcing means 220 extends along the axis of the operating shaft main body 210 from the end surface 211 a of the operating shaft main body 210 on the mounting portion 211 side to the end surface 213 a on the protruding portion 213 side. The entire operation shaft main body 210 is reinforced by the reinforcing means 220.

As shown in FIG. 5, the reinforcing means 220 is a rod material in which carbon fibers are arranged along the axial direction and hardened with resin, and irregularities along the axial direction are formed on the outer peripheral surface. .
The reinforcing means 220 is embedded in the operation shaft main body 210 by insert molding when the operation shaft main body 210 is formed.

In the operation shaft 200 described above, since the entire operation shaft main body 210 is reinforced by the reinforcing means 220, the life can be extended as compared with the conventional product made of synthetic resin, like the operation shaft 100.

Further, in the operating shaft 200, similarly to the operating shaft 100, the reinforcing means 220 can surely perform not only the bending of the operating shaft 200 but also the torsion of the operating shaft 200. The life of the operation shaft 200 can be extended as compared with the case where the cross-sectional shape of the 220 is circular.

In the operation shaft 200, the operation shaft body 21
Since the reinforcing means 220 is embedded in the operation shaft main body 210 by insert molding at the time of molding of No. 0, labor for press-fitting is not required as compared with the operation shaft 100 for press-fitting the reinforcing means 110, and manufacturing cost can be reduced.

Further, in the operating shaft 200, the reinforcing means 220
Is a bar reinforced with carbon fiber, so that the reinforcing means 1
As compared with the operation shaft 100 in which 10 is a metal rod, the weight can be reduced with the same reinforcement strength.

By using glass fibers instead of carbon fibers, it is of course possible to use a bar reinforced with glass fibers as the reinforcing means. When the rod reinforced with the glass fiber is used as the reinforcing means of the operation shaft, the weight can be reduced as compared with the operation shaft 100, similarly to the operation shaft 200. It is also possible to reduce the manufacturing cost as compared with the operation shaft 200 that performs the operation.

However, the operating shaft 200 using the bar reinforced with carbon fiber as the reinforcing means 220 has a greater reinforcing force than the case where the bar reinforced with glass fiber is used as the reinforcing means for the operating shaft. Can increase the strength of the means,
Therefore, the life of the operation shaft can be extended.

In the operating shaft 200, when the operating shaft main body 210 is formed, the reinforcing means 220, which is a bar reinforced with carbon fiber, is inserted into the operating shaft main body 21 by insert molding.
Embedded in 0. However, the reinforcing means embedded in the operation shaft main body 210 by insert molding is not limited to a rod material reinforced with carbon fiber or glass fiber, but may be a metal rod material or a plate material. It is.

[0054]

According to the first aspect of the present invention, at least the portion having the cut can be reinforced by the reinforcing means.
The service life can be extended as compared with conventional products made of synthetic resin.

According to the second aspect of the present invention, at least a portion having a cut can be reinforced with a metal bar, so that the life is prolonged as compared with the conventional synthetic resin product as in the first aspect of the present invention. be able to.

According to the third aspect of the present invention, at least a portion having a cut can be reinforced with a bar reinforced with glass fiber. Life can be extended.

According to the third aspect of the present invention, the reinforcing means comprises:
Since the bar is reinforced with glass fiber, the weight of the operating shaft can be reduced as compared with the invention of claim 2 in which the reinforcing means is a metal bar.

According to the fourth aspect of the present invention, at least a portion having a cut can be reinforced with a bar reinforced with carbon fibers. Life can be extended.

According to the fourth aspect of the present invention, the reinforcing means comprises:
Since the bar is reinforced with carbon fiber, the weight of the operating shaft can be reduced as compared with the invention of claim 2, wherein the reinforcing means is a metal bar. The strength of the reinforcing means can be increased and the life of the operation shaft can be prolonged, as compared with the invention of the third aspect, which is a bar reinforced with.

According to the fifth aspect of the present invention, when the operating shaft is integrally formed of synthetic resin, it is possible to prevent the occurrence of a nest which is likely to be generated at the shaft center, so that the yield of the operating shaft due to the occurrence of the nest can be reduced. The yield can be improved by preventing the reduction.

According to the sixth aspect of the present invention, when a rotational force is applied to the operating shaft via the knob, the outer peripheral surface of the operating rod is different from the case where the cross-sectional shape of the operating rod is circular. This makes it harder for slip to occur, so it is possible not only to reinforce the bending of the operating shaft, but also to reinforce the torsion of the operating shaft. The life of the shaft can be extended.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating an example of a first embodiment.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a sectional view taken along line YY of FIG.

FIG. 4 is a cross-sectional view illustrating an example of a second embodiment.

FIG. 5 is an end view showing the reinforcing means in FIG. 4;

FIG. 6 is an exploded perspective view showing an example of a conventional product.

FIG. 7 is a cross-sectional view for explaining the operation of the one shown in FIG.

FIG. 8 is a cross-sectional view for explaining the operation of the one shown in FIG.

[Explanation of symbols]

 100, 200 Operating shaft 111, 211 Mounting part 111b Cut 112 Rotational force transmitting part 114 Cavity part 120, 220 Reinforcement means 130 Knob

Claims (6)

[Claims] 1. One of the above has a mounting portion for mounting a knob for applying a rotating force, and the other has a rotating force transmitting portion for transmitting the rotating force, and the knob is fixed to the mounting portion. An operating shaft provided with a notch for performing the cutting operation, wherein the operating shaft is integrally formed of a synthetic resin, and a reinforcing means is embedded at least in a portion having the notch. 2. The operating shaft according to claim 1, wherein said reinforcing means is a metal bar. 3. The operating shaft according to claim 1, wherein said reinforcing means is a bar reinforced with glass fiber. 4. The operating shaft according to claim 1, wherein the reinforcing means is a bar reinforced with carbon fibers. 5. The operating shaft according to claim 1, wherein a hollow portion is formed along an axis during molding. 6. The operating shaft according to claim 2, wherein the bar has a cross-sectional shape other than a circle.