JPH0272255A - Rotary transmission device - Google Patents

Abstract

PURPOSE:To permit the transmission of the revolution torque from one to the other and suppress the transmission of the torque in the reverse direction by constituting the titled device so that the contact pressure with a winding cylindrical part of a coil spring is reduced by the application of the revolution torque supplied from one shaft and rewinding the spring by the torque supplied from the other shaft and increasing the contact pressure. CONSTITUTION:When an input shaft 1 is revolved in the clockwise direction, the edge part Xa of the groove part 1a of the input shaft 1 pushes the hook part 3a in engagement in the direction of arrow, and a coil spring 3 is wound. Then, the outside diameter of the spring 3 reduces, and the frictional force between the inner cylindrical part 4a of a housing 4 on the outer periphery reduces, and the corevolution with the input shaft 1 is permitted. When the other hook part 3b of the spring 3 is held in the state where said hook part 3b does not contact the edge part Xc of the groove part 1b of the input shaft 1 or the edge part Yc of the opened port part 2b of the output shaft 2, the spring 3 can be wound. Then, the output shaft 2 is revolved in the clockwise direction by allowing the edge part Yb of the opened port part 2a to be pressed by the edge part Xa of the groove part 1a of the input shaft 1 through the hook part 3a of the spring 3, and the revolution torque in the clockwise direction of the input shaft 1 is transmitted to the output shaft 2 side.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a rotation transmission system that transmits rotational torque from the input shaft side to the output shaft side and prevents the transmission of rotational torque from the output shaft side to the input shaft side. It is related to the device.

[Conventional technology]

If the driven device rotates due to inertia force etc. even after the drive source such as a motor stops, and the rotation of the drive shaft of the drive source due to this rotational torque is undesirable, there is a possibility that the drive shaft between the drive source and the driven device is A rotation transmission device is used that prevents transmission of rotational torque from the output shaft side to the input shaft side.

Fig. 12 and Fig. 13 are cross-sectional views of a conventional rotation transmission device used for the above purpose.
The figure shows a case where the rotational torque is transmitted.

In the figure, aυ is the input axis.

0z is the output shaft, α3 is a coil for pressing the flange portion of the input shaft (1) against the brake plate α9, and aS is a key that connects the input shaft U and the output shaft (IX5'e) in the rotation direction.

Next, the operation will be explained. Input shaft αD side output shaft u
When transmitting torque to the Z side, move the input shaft t111 to the output shaft α2 side as shown in Fig. 13 from the state shown in Fig. 12, that is, the state in which the flange of the input shaft aD and the brake plate contact After pressing and separating the flange part of the input shaft αD from the brake plate α9.

Apply rotational torque to the input shaft aD. Rotational torque is the key
(Output shaft a'avc is transmitted via IG. Input shaft r
A state in which there is no transmission of rotational torque from iυ, that is, the second
In the state shown in the figure, the output shaft α3#J and the input shaft αυ
When back torque is applied to the side, the flange part of the input shaft αυ is pressed against the brake plate rib by the coil Q3, so a reactionary torque due to friction acts, and the input shaft αD and the output shaft valve 3 Does not co-rotate.

[Problem that the invention attempts to solve]

In conventional rotation transmission devices, when trying to transmit rotational torque from the input shaft (11+ side to the output shaft +13 side), the input shaft θB is always pushed toward the output shaft α2 side against the reaction force of the coil spring 0. However, there is a problem in that it is necessary to separate the flange portion of the input shaft αυ from the brake plate.

This invention was made to solve this problem, and rotational torque can be transmitted from the input shaft to the output shaft without applying any axial movement to the input shaft.

It is also an object of the present invention to provide a rotation transmission device that can prevent rotational torque from being transmitted from the output shaft side to the input shaft side.

[Means to solve all problems]

The rotation transmission device according to the present invention includes a housing having a cylindrical portion, a coil spring whose outer peripheral portion is pressed into the cylindrical portion of the housing and is inserted therein, a shaft end portion of which is inserted into the coil spring, and the shaft end of which is inserted into the coil spring. a first shaft having a cylindrical portion formed at its end and first and second openings having a predetermined width in the circumferential direction at locations corresponding to both ends of the coil spring; A shaft end portion is inserted into the cylindrical portion of the first shaft, and corresponds to the first and second openings of the first shaft, respectively.

a second shaft having first and second grooves having a predetermined width in the circumferential direction that engage with both ends of the coil spring; 2nd above
The opening and the second groove overlap each other by a predetermined width, and the first opening and the second opening that do not overlap, or the first groove and the second groove, overlap each other by a predetermined width. One engagement location and the other engagement location of both ends are formed in different directions.

[Effect]

In this invention, when a rotational torque is applied from one of the first or second shafts, the coil spring is wound up, the contact pressure due to pressure contact with the cylindrical portion of the housing is reduced, and the spring is applied to the other shaft. Rotational torque is transmitted through the coil spring, and conversely, when rotation torque is applied from the other shaft side, the coil spring is unwound and the contact force with the cylindrical portion of the housing increases, and the Both the first and second shafts are restrained and transmission of the two-rotation torque is prevented.

[Embodiments of the invention]

An embodiment of the present invention will be explained with reference to FIGS. 1 to 11. FIG. 1 is a cross-sectional view of the rotation transmission device of this embodiment, and FIG. 2 is an exploded perspective view of the device shown in FIG.

In the figure, (1) is an input shaft as a second shaft in which first and second grooves (1a) and (1b) having a predetermined width in the circumferential direction are formed in the circumferential part; (2) is the cylindrical part (
2C) and has a predetermined width in the circumferential direction.
and an output shaft as a first shaft in which second openings (2a) and (2'') are formed, and (3) has claws (
A coil spring having 3a) and (3b), and a housing having a cylindrical portion (4a) (4). The input shaft (11 is inserted into the cylindrical part (2) of the output shaft (2), and the coil (11) is inserted into the cylindrical part (2) of the output shaft (2).
3) is arranged on the outer periphery of the output shaft (2). Claws (3a) at both ends of this coil spring (3).

At the position (3b), the first and second
The grooves (1a) and (1b) of the output shaft and the first and second openings (2a) of the output shaft overlap each other by a predetermined width, and the claw part (3a) of the coil spring (3) is inserted into this part. )
(5b) are engaged with each other. The first groove portion (1
a), opening (2a) and second groove (1'b)
The part where the and opening (2b) do not overlap is the claw part (2b).
3a) (6b) The positional relationship in one circumferential direction at the engagement location is different, and the positional relationship is completely opposite. Co., Ltd. 7 consisting of the input shaft (1), output shaft (21, and coil spring (3))
The bones are inserted into the cylindrical part (4a) of the housing (4).

The outer shape of the coil spring (3) is slightly larger than the inner diameter of the cylindrical portion (4a) of the housing (4).

When inserted into the inner cylinder part (4a) of the housing (4), the outer periphery of the coil spring (3) and the housing (4)
The output @ (2
1 is constructed so that it does not easily rotate.

Next, the principle of operation will be explained with reference to FIG.

This 0m3 diagram shows the cylindrical part (4 VC cord) of the housing (4).
(/L/ This is a diagram showing a cross section perpendicular to the axis in a state where the spring (3) is inserted. Now, the claw part (3a) on the near side is shown in the direction of the arrow, that is, the counterclockwise direction (hereinafter COW direction). When the blade is applied to the rotating direction (rotating direction), a frictional force due to the tension of the coil spring (3) is generated between the outer periphery of the coil spring (3) and the inner cylindrical part (4a) of the housing (4) as described above. Although it exists, it can be removed by further applying force to the claw portion (3a).

Connect the outer periphery of the coil spring (3) to the inner cylindrical part (of the housing (4)).
A pressing force acts on the inner wall of 4a), the frictional force increases, and the rotation of the coil spring (3) is completely restrained. Conversely, if a force is applied to the claw part (3a) on the 2nd front side from the direction opposite to the arrow shown in Fig. 3, that is, in the clockwise direction (hereinafter referred to as CW direction), the coil will spring up (3a). ) first
The stripes become rolled up and their outer diameter becomes smaller. The force that winds up the coil spring (3) is the second article.

The third thread propagates and acts one after another, and as a result, the outer diameter of the coil spring (3) becomes smaller overall in a tapered shape. As a result, the contact between the outer periphery of the coil spring (3) and the inner wall of the inner cylindrical part (4a) of the housing (4) is limited to the other claw part (3b).
), the frictional force is significantly reduced,
The coil spring (3) is connected to the cylindrical part (4) of the housing (4).
a) It becomes possible to rotate inside.

The same result can be obtained not only when a force is applied to the claw part (3a) on the far side, but also when a force is applied to the claw part (3b) on the rear side. However, when viewed from the front side, the acting direction of the force on the claw part (3b) and the resulting phenomenon are naturally related to the winding direction of the coil spring (3). The case is completely opposite.

Next, the operation of the rotation transmission device shown in FIG. 1 will be explained. FIGS. 4 and 5 are views showing cross sections A-A and B-B in FIG.

In Fig. 4, when the input shaft (1) is rotated in the CW direction, the end (Xa) of the groove (1a) of the input @ (1) has a claw (3a) that engages with this part. By pushing in the direction of the arrow, the coil spring (3) is rolled up, and the coil spring (
The outer diameter of the input shaft (1) is reduced, reducing the frictional force between the outer periphery and the inner cylindrical portion (4a) of the housing (4).
It becomes possible to combine with 1. The other claw part (5b) of the coil spring (31) or the groove part (1) of the input shaft (1) as shown in FIG.
1b) end (Xc) or the output shaft (2'I opening (
The coil spring (3) can be wound in by being held so as not to contact the end (Yb) of the opening (2a), and the output shaft (2) ) is connected to the input shaft (11) via the claw (3a) of the coil (3).
is pushed by the end (Xa) of the groove (1a) to rotate in the CW direction, and as a result, the CW rotation torque of the input shaft (11) is transmitted to the output shaft (21 side).

Figures 6 and 7 show A-A and B- in Figure 1 when the input shaft (1) is rotated in the CaW direction, respectively.
It is a figure showing B cross section. In this case, in FIG. 7, the end (
X (1) engages with the claw (5b) and pushes in the direction of the arrow C to wind up the coil spring (3).

That is, the other claw portion (3a) is as shown in FIG.

By being held in a state where it does not come into contact with the end (Xb) of the groove (1a) of the input shaft (1) or the end (Yb) of the opening (2a) of the output shaft (21), the coil is (3), and the output shaft (2) is connected to its opening (2b).
) end (YC) tClaw part (5b) of coil spring (3)
is pushed by the end (Xd) of the groove (1b) of the input shaft (11) through the input shaft (
The CaW direction torque of 1) is transmitted to the output shaft (21 side).

Figures 8 and 9 show the output shaft (21 when rotated in the CaW direction, Figures 10 and 11 show the output shaft (2)
2A and 2B are diagrams showing cross sections AA and BB in FIG. 1, respectively, when rotated in the CW force direction.

When attempting to rotate the output shaft (2) in the CaW direction, the first opening (2) of the output shaft (2) in FIG.
The end (yb) of a) is the claw part (3a) of the coil spring (3)
At this time, a force is applied to the claw part (6a) in the direction of expanding the coil spring (31t), and a frictional force is generated between the outer circumference of the coil spring (3) and the cylindrical part (4a) of the nozzle (4). is increased, and the rotation of the coil spring (3) is prevented.As a result, neither the input shaft (1) nor the output shaft (2) rotates in the CaW direction.

Furthermore, when attempting to rotate the output shaft (2) in the CW force direction, the end (YC) of the second opening (2b) of the output shaft (2) will splatter ( 3) claw part (3)
In case b), a force is applied to the claw part (6b) in the direction of spreading the coil spring (3), and the reason is the same as when trying to rotate the output shaft (2) in the CaW direction. The input shaft (
1) and the output shaft (2) do not rotate in the CW force direction.

That is, rotation from the output shaft (2) toward the input shaft (1) is not transmitted in both the CW force direction and the CaW direction.

As mentioned above, the reason why the rotation of the input shaft (1) in both the CW force direction and the CCW direction can be transmitted to the output shaft (2) side is because the outer diameter of the coil spring (3) is Although it can be made smaller, when one of the claws 9, for example (5a), is engaged with the end (Xa) of the groove (1a) of the input shaft (11) to wind up the coil spring (3).

It is necessary to generate a relative displacement in the circumferential direction between the claw part (6a) and the other claw part (6b). In order to prevent the generation of this relative deviation width A, it is necessary to
The groove (1b) of the input shaft (1) and the opening (2b) of the output shaft (2) engaged with b) have a sufficient width B in the circumferential direction.
It is necessary to have the following.

In reality, the rotation is transmitted to the CW force direction of the input shaft (1) and the CaW direction output shaft (2), and the C
Rotation toward the input shaft (1) must be prevented in both the W force direction and the CaW direction. To achieve this objective, the first and second grooves (ta,), (1b) and the first
and the circumferential width of the second openings (2a) and (2'') is the same as above and <B, and the width of the first groove part (1a) and the opening (2a
), and the width of the portion where the second groove portion (1b) and the opening portion (2b) overlap in the circumferential direction is C.

The width of the overlapping part 9 is B-C, and the width C of the overlapping part and the width B-C of the non-overlapping part are the claw part (3a) when the coil spring (3) is wound.
, ), and (3b) are formed to be wider than the relative deviation width A.

Furthermore, the positional relationship of the above non-overlapping parts is shown in Figure 4~
They are formed in the relationship shown in FIG. That is,
The non-overlapping portions are formed in different circumferential directions at engagement points with the claws (3a) and (3b) at both ends of the coil spring (3).

For example, when rotating the input shaft (11 in the CW force direction), in FIG. In FIG. 4, the end of the first groove (1a) (X
When the input shaft (1) is rotated in the CaW direction as shown in P1 so that the input shaft (1) a) comes into contact with the claw part (3a) and winds up the coil spring (3), as shown in FIG. In FIG. 7, before the end (Xb) of the first groove (1a) of the input shaft (1) comes into contact with the claw (3a) of the coil spring (3), the second groove (11) ) O end (Xd) is the claw part (
The first and M2 grooves (1a) and (1b) of the input shaft fil have a positional relationship such that the coil spring (3) is brought into contact with the coil spring (3b).

Input shaft (11 first and second grooves (ja), (1"
) and the first and second openings (2a
).

As a result of the positional relationship (2b) being formed as described above, when trying to rotate the output shaft (2), the coil spring (3) is unwound in the CCW direction and the CW force direction. As a result, both the input shaft (1) and the output shaft (2) are restrained. If the first groove (1a) and the opening (
1b) and the positional relationship of the non-overlapping portions of the second groove (1b) and the opening (2b) is in the opposite relationship to the above, from the output shaft (2) side as the first shaft. The rotational torque is transmitted, and the transmission of the rotational torque from the input shaft (11 side) as the second shaft is prevented. In other words, in this case, the opening (2a).

(2b) is used as the input shaft, and the second shaft on which the S portion is formed is used as the output shaft, and the same effect as above can be obtained.

In addition, the first groove (1a), the opening (2a) and the second
Even if the positional relationship between the groove (1b) and the opening (2b) is as shown in Figures 4 to 11, if the winding direction of the coil spring (3) is different from the above case, the rotation will occur. The torque transmission and blocking directions are also opposite, and in this case, a rotation transmission device is obtained in which the first shaft is the input shaft and the second shaft is the output shaft.

〔Effect of the invention〕

As described above, according to the present invention, when rotational torque is applied from one of the first or second shafts, the coil spring is wound up, reducing the contact force with the cylindrical portion of the nozzle, and vice versa. When a rotational torque is applied from the other shaft side to the coil spring, the coil spring is unwound and the contact force with the cylindrical portion of the housing is increased. This has the effect of providing an easy-to-handle rotation transmission device in which rotational torque is transmitted from one shaft side to the other shaft, and transmission of rotational torque in the opposite direction is prevented.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a rotation transmission device according to an embodiment of the present invention, Fig. 2 is an exploded perspective view of the device shown in Fig. 1, and Fig. 3 is a state in which a coil spring is inserted into the nozzle. Explanatory diagrams showing the action of the coil spring in Figures 4 to 11
The figure shows the A-A cross section or the B-B cross section of FIG. FIG. 7 is an explanatory diagram when a CaW force direction rotation torque is applied to the input shaft. Figures 8 and 9 are explanatory diagrams when a rotational torque in the CCW direction is applied to the output shaft, Figures 10 and 11 are explanatory diagrams when a rotational torque in the CW force direction is applied to the output shaft, and Figure 1
2 and 13 are cross-sectional views showing conventional rotation transmission devices. In the figure, (1) is the input axis, (Ia, l, (1b
, ) are the first and second grooves, (2) is the output shaft, (
2a), (2b) are the first and second openings, (3c
) is the cylindrical part, (3) is the coil spring, (3a), (3
b) is the claw part of the coil spring, (4) is the nozzle, (
4a) Shows the inner cylinder part of the Id housing. In addition, in FIG. 1, the same reference numerals indicate the same or half parts.

Claims (1)

[Claims] a housing having a cylindrical portion; a coil spring having an outer peripheral portion pressed into the cylindrical portion of the housing and inserted therein; a shaft end portion being inserted into the coil spring; and a cylindrical portion formed in the shaft end; and a first shaft in which first and second openings having a predetermined width in the circumferential direction are formed at locations corresponding to both ends of the coil spring, and a shaft in the cylindrical portion of the first shaft. first and second coil springs having a predetermined width in the circumferential direction, the ends of which are inserted and correspond to the first and second openings of the first shaft, respectively, and which engage with both ends of the coil spring; a second shaft having a groove formed therein, the first opening and the first groove overlap each other by a predetermined width, and the second axis and the second groove overlap each other by a predetermined width; The first opening and the second opening or the first groove and the second groove are formed in different directions at one engagement point and the other engagement point at both ends of the coil spring. A rotation transmission device characterized by: