JPH04185915A - Shaft coupling - Google Patents

Abstract

PURPOSE:To accept declination and eccentricity to an axis and allow thrust movement by providing guide means around the rotational center of a primary shaft and a follower shaft and also providing flexible torque transmitting members between both guide means. CONSTITUTION:Multiple 1st guide means 12a to 12h are formed at a primary shaft-end 3 in circumferential direction at equal intervals, and 2nd guide means 14a to 14h are formed at a follower shaft end 5 with these positions corresponding to those of the 1st guide means 12a to 12h. The 1st guide means 12a to 12h are composed of oval holes extended in X-axis direction and the 2nd guide means 14a to 14h is composed of oval holes extended in Y-axis direction. Flexible torque transmitting members 16a to 16h are provided between the 1st and 2nd guide means, and the transmitting members 16a to 16h are composed of primary side slide units 18a to 18h and follower side slide units 20a to 20h. Thus, when a torque is transmitted, eccentric and declined thrusts are acceptable by the deformation of the torque transmitting members 16a to 16h and the movement of the slide members 18a to 18h and 20a to 20h in the oval holes of the guide members.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a shaft coupling, and particularly to eccentricity between a driving shaft and a driven shaft,
The present invention relates to a shaft coupling that can handle both deflection angle and thrust movement and can transmit good rotational force.

[Prior Art and Problems to be Solved by the Invention] In various rotational force transmission mechanisms, the ends of two shafts are connected by a joint. In this connection, even if both shafts have the same center of rotation, due to various reasons, the axis deviation angle, that is, the angle formed by the rotation centers, and the axis eccentricity, that is, the angle between the rotation centers, may occur between the driving shaft side and the driven shaft side. Parallel misalignment may occur, and a joint that can effectively deal with this is used. Hook joints and the like are effective for dealing with deviation angles, and Oldham joints, Schmidt joints, etc. are effective for dealing with eccentricity.

Although these joints are extremely effective against one side of declination and eccentricity, they cannot effectively deal with both.

Furthermore, relative movement (thrust movement) in the axial direction may occur between the driving shaft and the driven shaft, and it is desirable to be able to deal with this effectively.

Therefore, a flexible shaft joint using a flexible member is used as a shaft joint that can effectively deal with both the declination and eccentricity and is capable of thrust movement.

Examples of the flexible shaft joint include those using a spring or a wire as a flexible member. However, in these conventional flexible shaft joints, measures against eccentricity, declination, and thrust movement are imposed only on the deformation of the flexible member, so the flexible member has a relatively large amount of deformation. That is, a relatively soft material had to be used, and as a result, rotational force transmission during the transition period when the equilibrium state changed was not sufficiently good.

Therefore, the present invention provides an improvement that can effectively cope with both shaft deviation angle and shaft eccentricity, can perform thrust movement, and can also transmit rotational force well even during the transition period when the equilibrium state changes. The purpose is to provide a shaft coupling that is

[Means for Solving the Problems] According to the present invention, the above object is achieved by: A driving shaft end portion and a driven shaft end portion are disposed facing each other, and the driving shaft end portion has a direction toward the rotation center of the driving shaft. A plurality of first guide means are formed around the rotation center of the driving shaft in a plane orthogonal to the driven shaft. The same number of second guide means as the first guide means are formed around the driven shaft rotation center in a plane perpendicular to the driven shaft rotation center direction at the end portion, and the second guide means all have a guiding function along the second direction, and a flexible rotational force transmitting member is interposed between the corresponding first guide means and second guide means, respectively, These rotational force transmitting members are guided by the first guide means and are slidable in the first direction and in the direction of the rotation center of the drive shaft, and are guided by the second guide means and moved in the second direction. This is achieved by a shaft joint, characterized in that it has a driven side sliding portion that is slidable in the direction and the direction of the rotation center of the driven shaft.

[Example] Hereinafter, specific examples of the present invention will be described with reference to the drawings.

FIG. 1 is an exploded perspective view showing a first embodiment of a shaft joint according to the present invention, and FIG. 2 is a sectional view taken along the X-Z plane.

In these figures, 2 is a driving shaft, 2' is its center of rotation, and 3 is an end of the driving shaft.

Further, 4° is the center of rotation of the driven shaft, and 5 is the end of the driven shaft. Although not shown in FIG. 1, the driven shaft 4 has the same structure as the driving shaft 2 described above. The driving shaft 2 and the driven shaft 4 have their end portions 3 and 5 facing each other, and have a rotation center 2.
and 4 degrees coincide with each other in the Z direction.

The end surface of the drive shaft end 3 on the driven shaft end 5 side is a plane (xy plane) orthogonal to the drive shaft rotation center 2°. Similarly, the end surface of the driven shaft end 5 on the drive shaft end 3 side is a plane (X-Y plane) orthogonal to the driven shaft rotation center 4°.

On the driven shaft end portion 5, eight second guide means 14a to 14h are formed at equal intervals in the circumferential direction at positions a specific distance from the driven shaft rotation center 4°. The second guide means consists of an elongated hole with a predetermined width in the Y direction. Similarly, eight first guide means 12a to 1 are provided at equal intervals in the circumferential direction at the drive shaft end 3 at a position at the specified distance from the drive shaft rotation center 2°.
2h is formed. The first guide means also consists of an elongated hole in the X direction having the predetermined width.

The driving shaft end 3 and the driven shaft end 5 have the same configuration. And these are the center of rotation of 2°.

By arranging them at an angle of 90 degrees around 4°, the result will be as shown in Fig. 1. Therefore, the first guide means 12a to 1
2h and the configurations of the second guide means 14a to 14h are as follows.
This can be easily understood by looking at the driving shaft end 3 and the driven shaft end 5 together in the figure and by referring to FIG. 2. That is, these guide means consist of an elongated hole formed at the end of the shaft and a backup cap member attached to the elongated hole.

The first guide means 12a and the second guide means 1
4a, a flexible rotational force transmitting member 16a is interposed. The rotational force transmitting member includes a driving side slide portion 18a housed within the first guide means 12a and a driven side slide portion 20a housed within the second guide means 14a. Drive side slide part 18a
The width of the slide portion 18a is approximately the same as the width of the first guide means 12a, and the length of the slide portion 18a is the same as the width of the first guide means 12a.
shorter than the length of a. Similarly, the width of the driven slide portion 20a is approximately the same as the width of the second guide means 14a,
The length of the slide portion 20a is determined by the length of the second guide means 14a.
shorter than the length of

Similarly, the first guide means 12b to 12h and the second guide means 12b to 12h are
Flexible rotational force transmitting members 16b to 16h are interposed between the guide means 14b to 14h, respectively. The rotational force transmitting members 16b to 16h include drive side slide portions 18b to 18h housed in the first guide means 12b to 12h, respectively, and the second guide means 14.
Driven side slide portion 20b accommodated in b to 14h
~20h.

The eight rotational force transmission members 16a to 16h are all equal. Further, the driving side sliding portion and the driven side sliding portion of each rotational force transmitting member are equal.

The rotational force transmitting members 16a to 16h are made of a synthetic resin (for example, Delrin [trade name]) having appropriate flexibility, appropriate slipperiness, and appropriate strength. Further, the rotational force transmitting member has self-lubricating properties and continuously performs a lubricating action on the first guide means 12a to 12h and the second guide means 14a to 14h.

The shaft joint of this embodiment as described above can be easily manufactured by assembling the constituent members as shown in FIG. 1, and parts replacement work is also simple. Furthermore, since all rotational force transmitting members are made the same, the number of types of parts can be reduced.

In this embodiment, when the driving shaft 2 rotates, the rotational force is transferred to the driving side slide portion 1 of the rotational force transmitting members 16a to 16h.
8a to 18h and the driven side slide parts 20a to 20h, and the driven shaft 4 is rotated. On this occasion,
Driving side slide portion 18 of rotational force transmission members 168 to 16h
A to 18h, driven side slide portions 20a to 20h, and especially the joint portions thereof, are allowed to undergo some deformation.

If eccentricity occurs between the driving shaft rotation center 2° and the driven shaft rotation center 4°, mainly the first guide means 12a to 1
Due to the sliding movement of the driving side sliding parts 18a to 18h within 2h and the sliding movement of the driving side sliding parts 20a to 20h within the second guide means 14a to 14h, the driving side sliding parts 18a to 18h and the driven side are further moved. Bending deformation of the joint portions with the slide portions 208 to 20h can also be dealt with favorably.

Further, if an deviation occurs between the driving shaft rotation center 2° and the driven shaft rotation center 4°, the first guide means 12a to 12
Deformation and rocking of the driving side slide portions 18a to 18h (unequal movement in the 2° direction of the rotation center of the driving shaft) within the second guide means 14a to 14h, and of the driven side slide portions 208 to 20h within the second guide means 14a to 14h. Deformation and rocking (driven shaft rotation center 4°
Due to the uneven movement in the direction), the drive side slide part]8
It is possible to cope with the bending deformation of the joints between a to 18h and the driven slide portions 20a to 20h.

Furthermore, the driving shaft rotation center 2° and the driven shaft rotation center 4°
In the case of thrust movement with the first guide means 12a~
Parallel movement of the driving side slide parts 18a to 18h in the direction of the driving shaft rotation center 2' within 12h and the second guide means 1
The driven side slide portions 20a to 20 within 4a to 14h
This can be dealt with satisfactorily by moving h in parallel in the 4° direction of the rotation center of the driven shaft.

In reality, the eccentricity, yaw angle, and thrust movement described above occur in combination, and accordingly, a combination of the above movements is exhibited.

Incidentally, since the magnitudes of the eccentricity, declination angle, and thrust movement are limited within a range that is substantially within the range, the driving side slide portion 1 of the rotational force transmitting members 16a to 16h is
8a to 18h and the driven side slide portions 208 to 20h will not separate from the guide means, and each part of the rotational force transmitting member will not be deformed beyond the allowable limit.

As described above, according to this embodiment, the rotational force transmission member 1
Modifications of 6a-16h and first guide means 12a-
By performing three types of deformation/displacement at the same time: movement of the driving side slide portions 188 to 18h within 12h and movement of the driven side slide portions 20a to 20h within the second guide means 14a to 14h, each deformation/displacement is Even if it is small, a desired amount of overall deformation/displacement can be obtained, and thus the rotational force is transmitted particularly well during the transition period when the equilibrium state changes. In addition, in this embodiment, the synthetic resin rotational force transmission member 1
Since 6a to 16h are used, the effect of damping vibrations and suppressing transmission of the vibrations is also good. Furthermore, in this embodiment, a plurality of rotational force transmitting members 16a to 16h are provided in the circumferential direction.
, it is possible to transmit relatively large rotational force.

FIG. 3 is an exploded perspective view showing a second embodiment of the shaft joint according to the present invention, and FIG. 4 is a sectional view taken along the x-2 plane. In these figures, the same members as in FIGS. 1 and 2 are given the same reference numerals.

In this embodiment, the second guide means 14a to 14h are different from the second guide means 14a to 14h of the first embodiment. That is, in this embodiment, each of the second guide means 14a' to 14h is constituted by attaching two parallel screen members to the surface of the driven shaft end 5 on the driving shaft end 3 side.

Although the first guide means 12a° to 12h' are not shown in FIG. 3, they are equivalent to the second guide means 14a' to 14h' (see FIG. 4). Incidentally, the second guide means 14a'' to 14h° are similar to the first embodiment.
It is oriented perpendicularly to angles 4a' to 14h.

This embodiment also provides the same effects as the first embodiment.

FIG. 5 is a partially exploded side view showing a third embodiment of the shaft joint according to the present invention, and FIGS. 6 and 7 are views of the driving shaft side and the driven shaft side, respectively.

In these figures, the same members as in FIGS. 3 and 4 are given the same reference numerals.

In this embodiment, the first guide means 12a'' to 12h'' and the second guide means 14a'' to 14h'' are different from the first guide means and second guide means of the second embodiment. That is, in this embodiment, two of each of the first guide means of the second embodiment are arranged side by side on the surface of the driving shaft end 3 on the driven shaft end 5 side. Two of the second guide means of the second embodiment are arranged side by side on the surface of the section 5 on the driving shaft end 3 side. FIG. 8 is an exploded view of the screen member constituting the guide means of this embodiment.

In addition, in this embodiment, the synthetic resin rotational force transmission member 16a
The rotational force transmitting members 16a to 16h made of synthetic resin are also different from the rotational force transmitting members 16a to 16h of the second embodiment. That is, in this embodiment, for example, the rotational force transmitting member 16a' has two parallel drive-side slide parts 18a' and 19, as shown in FIG.
a' and two parallel driven side slide parts 20a', 2
1a' is formed into a cross-shaped structure. The same applies to the other rotational force transmitting members 16b to 16h.

In this embodiment, the first guide means 12a" to 12d"
and second guide means 14a'' to 14d'' are arranged at positions dividing the circumferential direction into four equal parts at a first distance from the driving shaft rotation center 2' and the driven shaft rotation center 4°, and between these, the first
Guide means 12e'' to 12h'' and second guide means 14
e'' to 14h'' are arranged at positions that equally divide the circumferential direction by a second distance (smaller than the first distance) from the driving shaft rotation center 2° and the driven shaft rotation center 4'.

This embodiment also provides the same effects as the first and second embodiments.

[Effects of the Invention] As described above, the shaft joint of the present invention has a plurality of first guide means formed around the rotation center of the driving shaft, and a plurality of first guide means formed around the rotation center of the driven shaft corresponding to the first guide means. The same number of second guide means are formed, and a flexible rotational force transmission member having a driving side sliding part and a driven side sliding part is interposed between the corresponding first guide means and second guide means. According to
It can cope well with both shaft deflection angle and shaft eccentricity, allows thrust movement, and can transmit rotational force well even during the transition period when the equilibrium state changes.

Moreover, according to the shaft joint of the present invention, vibration transmission can be suppressed.

Further, according to the shaft joint of the present invention, since a plurality of rotational force transmission members are arranged in the circumferential direction, a relatively large rotational force can be transmitted.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of a shaft joint according to the present invention, and FIG. 2 is a sectional view taken along the line X-2. FIG. 3 is an exploded perspective view showing a second embodiment of the shaft joint according to the present invention, and FIG. 4 is a sectional view taken along the line X-2. FIG. 5 is a partially exploded side view showing a third embodiment of the shaft joint according to the present invention, and FIGS. 6 and 7 are views of the driving shaft side and the driven shaft side, respectively. FIG. 8 is an exploded view of the screen member constituting the guide means of this embodiment, and FIG. 9 is a perspective view of the rotational force transmission member of this embodiment. 2: Driving shaft, 2': Driving shaft rotation center, 3:
Driving shaft end, 4°: Driven shaft rotation center, 5: Driven shaft end, 12a
- 12h: first guide means, 14a - 14h: second guide means, 16a - 16h: rotational force transmission member, 18a - 18h: driving side slide part, 20a - 20h: driven side slide part. Fig. 2 15'4 b ゛Hegawa Fig. 6 12' Fig. 7 Fig. 8 Fig. 9

Claims (1)

[Claims] (1) A driving shaft end and a driven shaft end are arranged to face each other, and the driving shaft end has a plurality of shafts around the driving shaft rotation center in a plane orthogonal to the driving shaft rotation center direction. 1 guide means are formed, all of the first guide means have a guiding function along the first direction, and the driven shaft end has a guide means in a plane perpendicular to the rotation center direction of the driven shaft. The same number of second guide means as the first guide means are formed around the rotation center of the driven shaft, and
All of the guide means have a guiding function along the second direction, and flexible rotational force transmission members are interposed between the corresponding first guide means and second guide means. These rotational force transmitting members are guided by the first guide means and are slidable in the first direction and in the direction of the rotation center of the drive shaft, and are guided by the second guide means and are slidable in the first direction and in the direction of the rotation center of the drive shaft. 2 and a driven side slide portion that is slidable in the rotation center direction of the driven shaft.