JPH05288223A - Shaft coupling - Google Patents

Abstract

PURPOSE:To provide a shaft coupling capable of properly dealing with the eccentricity and angle of deviation between a drive shaft and a driven shaft and with thrust movement, having high efficiency, capable of being miniaturized and having sufficient strength even when miniaturized. CONSTITUTION:A pair of sliding surfaces 10 parallel to an Y-Z plane are formed in a drive shaft side attaching member 6 attached to a drive shaft end portion 2. A pair of sliding surfaces 12 parallel to an X-Z plane are formed in a driven shaft side attaching member 8 attached to a driven shaft end portion 4. A torque transmission member 14 has a first member 15a having a pair of first sliding surfaces 16 slidable against the drive shaft side sliding surfaces 10 and a second member 15b having a pair of second sliding surfaces 18 slidable against the driven shaft side sliding surfaces 12. The first 15a and second 15b members are supported by a ring-shaped member 20 and are located adjacent each other along Z-axis.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft coupling, and more particularly, it can cope well with eccentricity, declination, and thrust direction movement between a driving shaft side and a driven shaft side, which is efficient and can be downsized. And a shaft coupling having sufficient strength.

[0002]

2. Description of the Related Art In various torque transmission mechanisms, the ends of two rotary shafts are connected by a joint. For example, the output rotary shaft of the motor and the input rotary shaft of the pump are connected by a joint. In this case, it takes a great deal of effort to carefully install the motor and the pump so that the output rotation shaft of the motor and the input rotation shaft of the pump are sufficiently aligned. In addition, even if you pay attention to such alignment and install it, some eccentricity and declination remain between both rotating shafts, and further vibration occurs in the motor and pump during operation, In order to absorb these in the joint portion, a flexible shaft joint using a flexible member such as a spring or rubber has been conventionally used. Also,
An Oldham coupling is used as a coupling capable of coping with eccentricity, declination, and thrust direction movement.

In such a shaft coupling, a proper mounting member is attached to each of the driving shaft end portion and the driven shaft end portion, and the driving shaft side mounting member and the driven shaft side mounting member are connected by a proper mechanism. Is common.

The present invention improves upon the conventional Oldham coupling,
It can deal well with eccentricity, declination and thrust movement between the driving shaft side and the driven shaft side, and it is highly efficient and can be downsized.
Moreover, it is an object of the present invention to provide a shaft coupling having sufficient strength even if it is downsized.

Another object of the present invention is to provide a shaft coupling which can smoothly transmit a rotational force and is easy to maintain.

[0006]

According to the present invention, in order to achieve the above object, a driving shaft side mounting member and a driven shaft side mounting member are arranged to face each other, and the driven shaft side mounting member is driven. The side end surface is formed with a pair of slide surfaces parallel to the first direction surface passing through the axial direction, and the driven side end surface of the driven shaft side mounting member is parallel to the second direction surface passing through the axial direction. A pair of slide surfaces are formed, and a rotational force transmitting member is disposed between the driving shaft side mounting member and the driven shaft side mounting member, and the rotational force transmitting member is the driving shaft side. It has a first member having a first slide surface which makes a pair slidable with respect to the slide surface of the mounting member, and a second slide surface which makes a pair slidable with respect to the slide surface of the driven shaft side mounting member. Has a second member and these Both end portions of the first member and the second member is supported by a common ring-shaped member, moreover the first
There is provided a shaft coupling, wherein the member and the second member are positioned adjacent to each other in the axial direction.

In one aspect of the present invention, at least a sliding surface of the driving shaft side mounting member and at least a sliding surface of the driven shaft side mounting member are made of metal, and at least a first sliding surface and a first sliding surface of the rotational force transmitting member are provided. 2 The sliding surface is made of plastic. In the present invention,
The rotational force transmitting member may be made of a plastic integrally molded product. Further, in the present invention, the first
It is preferable that the direction and the second direction are orthogonal to each other.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view showing a first embodiment of a shaft coupling according to the present invention, FIG. 2 is a perspective view of its assembled state, FIG. 3 is a partially omitted front view, and FIG. FIG.

In these figures, 2 is a cylindrical driving shaft end portion, and 2'is a driving shaft rotation center. Also, 4
Is a cylindrical driven shaft end, and 4'is a driven shaft rotation center. The driving shaft end portion 2 and the driven shaft end portion 4 are arranged so as to face each other and the rotation centers 2 ′ and 4 ′ coincide with each other in the Z direction. That is, the axial direction is the Z direction.

A metallic driving shaft side mounting member 6 is attached to the driving shaft end portion 2. The mounting member has a through hole in the Z direction, and the inner surface of the through hole is fitted to the outer peripheral surface of the drive shaft end 2. A key or a spline may be used to mount the mounting member 6, and further, the cylindrical outer peripheral surface of the driving shaft end portion 2 may be mounted without being processed or after being processed by press fitting. The driven side end of the driving shaft side mounting member 6 is formed as a flange 7, and two grooves in the Y direction are formed on the driven side end surface of the flange, and each groove has a rectangular cross section. A pair of side surfaces parallel to the -Z plane are the slide inner surface 10.

Similarly, a driven shaft side mounting member 8 made of metal is attached to the driven shaft end 4. The mounting member is Z
Direction through hole, and the inner surface of the through hole is fitted to the outer peripheral surface of the driven shaft end 4. A key or a spline may be used to mount the mounting member 8, and further, the cylindrical outer peripheral surface of the driven shaft end 4 may be mounted without being processed or by press fitting. The driven side end of the driven shaft side mounting member 8 is formed as a flange 9, and two grooves in the X direction are formed on the driven side end surface of the flange, and each groove has a rectangular cross section. A pair of side surfaces parallel to the -Z plane are the slide inner surface 12.

A rotational force transmitting member 14 is located between the driving shaft side mounting member 6 and the driven shaft side mounting member 8. The rotational force transmitting member 14 has a first member 15a having two pairs of first slide outer surfaces 16 slidably fitted to the two pairs of slide inner surfaces 10 of the driving shaft side mounting member 6, and a driven shaft side mounting member 8. Two slide inner surfaces 12 and a second member 15b having two pairs of second slide outer surfaces 18 slidably adapted. The first member and the second member have a rectangular cross section, and both ends thereof are connected to and supported by the ring-shaped member 20. That is, the torque transmission member 14 is the first
It comprises a member 15a, a second member 15b and a ring-shaped member 20.

Incidentally, FIG. 3 is a view seen from the driven side with the driven shaft side mounting member 8 removed.

The rotational force transmitting member 14 is made of a plastic integrally molded product. As the plastic material, a synthetic material having a proper sliding property with respect to the metal material of the driving shaft side mounting member 6 and the driven shaft side mounting member 8 such as iron, having a suitable strength, and further having a suitable flexibility. Resins such as polyacetal resin and polyamide resin can be used. The first member 15a and the second member 15b of the plastic rotational force transmitting member 14 have self-lubricating properties, and are formed on the slide inner surface 10 of the driving shaft side mounting member 6 and the slide inner surface 12 of the driven shaft side mounting member 8. Continues to lubricate at contact.

Thus, in the present embodiment, in the rotational force transmitting member 14, the first slide outer surface 16 of the driving side first member 15a slides in the Y direction relative to the slide inner surface 10 of the driving shaft side mounting member, and the Z direction. Of the driven shaft side mounting member 6 can be moved relative to the driving shaft side mounting member 6, and the second slide outer surface 18 of the driven side second member 15b is the slide inner surface of the driven shaft side mounting member. By performing a sliding movement in the X direction, a sliding movement in the Z direction, and a rotation around the Y direction with respect to 12, it is possible to move relative to the driven shaft side mounting member 8.

In this embodiment, when the driving shaft end portion 2 is rotated, its rotational force is transmitted from the driving shaft side mounting member 6 to the driven shaft side mounting member 8 via the rotational force transmitting member 14, and the driven shaft end portion 8 is driven. The part 4 is rotated. When eccentricity, declination, or thrust movement occurs between the driving shaft end 2 and the driven shaft end 4, relative movement between the rotational force transmitting member 14 and the driving shaft side mounting member 6 as described above and Rotational force transmission member 14
The relative movement between the driven shaft side attachment member 8 and the driven shaft side attachment member 8 can be dealt with well. The distance between the driving shaft side mounting member 6 and the driven shaft side mounting member 8 may be appropriately determined according to the expected eccentricity, declination, or thrust movement. The same applies to the difference between the outer diameter of the flange 7 of the driving shaft side mounting member and the flange 9 of the driven shaft side mounting member and the inner diameter of the ring-shaped member 20.

In this embodiment, as can be seen from FIGS. 1 and 4, in the rotational force transmitting member 14, the first member 15a and the second member 15b are adjacent to each other in the Z-axis direction (that is, there is no inclusion). positioned. Therefore, the driving shaft side mounting member 6 and the driven shaft side mounting member 8 can be brought sufficiently close to each other, the axial dimension can be reduced, the size can be reduced, and the rotational force transmission efficiency can be improved. be able to. Further, since the first member 15a and the second member 15b are supported by the ring-shaped member 20, the rotational force transmitting member 14 having sufficient strength can be obtained, and even if the rotational force transmitting member is reduced in size and weight, it is sufficient. A large torque can be transmitted.

In this embodiment, since the rotational force transmitting member 14 has an appropriate degree of flexibility, it is possible to suppress vibration transmission between the driving shaft side and the driven shaft side, and to further prevent the rotational force when a sudden load change occurs. The transmission can be changed smoothly.

Further, in this embodiment, the rotational force transmitting member 14
Since it exhibits self-lubricating properties in sliding contact with the driving shaft side mounting member 6 and the driven shaft side mounting member 8, it is not necessary to use lubricating oil and maintenance is simple. In addition, in this embodiment, since the rotational force transmitting member 14 is made of insulating plastic, the driving shaft side and the driven shaft side can be electrically insulated.

Since the present embodiment is not based on the deformation of the flexible member only, unlike the conventional flexible shaft coupling, energy loss is small and the rotational force transmission efficiency is good. Further, in the present embodiment, since the rotational force transmitting member 14 is made of plastic and is lightweight, even if the rotational force transmitting member eccentrically moves due to eccentricity and its change at high speed rotation, vibrations due to it are less likely to occur.

FIG. 5 is a partially cutaway exploded perspective view showing a second embodiment of the shaft coupling according to the present invention, and FIG. 6 is a perspective view showing its assembled state. In these figures, members having the same functions as those in FIGS. 1 to 4 are designated by the same reference numerals.

In this embodiment, both the driving shaft side mounting member 6 and the driven shaft side mounting member 8 are substantially cylindrical. Further, the number of grooves formed in these mounting members is four, and correspondingly, the first member 1 of the rotational force transmission member 14 is formed.
The number of 5a and the number of second members 15b are also four. Also,
As shown in FIG. 5, in the present embodiment, the second member 15
A recess is formed on the surface of the driven side of b. Although not shown, a recess is also formed in the surface of the first member 15a on the driving side. This is due to the reason for molding the plastic, but it also helps to improve the strength.

Further, in this embodiment, the rotational force transmitting member 14
A through hole in the Z direction is formed in the center of the. The inner diameter of the through hole may be formed to be slightly larger than the outer diameters of the driving shaft end and the driven shaft end, and the tip of the driving shaft end and the tip of the driven shaft end may be positioned in the through hole. This makes it possible to further reduce the axial length of the entire rotational force transmission mechanism.

The function of the shaft joint of this embodiment is basically the same as that of the shaft joint of the first embodiment. The present embodiment is particularly suitable for large diameter shaft couplings.

In the above embodiments, the sliding surfaces of the driving shaft end portion and the driven shaft end portion are inner surfaces, and the first sliding surface and the second sliding surface of the rotational force transmitting member are outer surfaces. However, in the present invention, the sliding surfaces of the driving shaft end portion and the driven shaft end portion are outer surfaces and the first of the rotational force transmitting members is provided.
The slide surface and the second slide surface may be inner surfaces.

Although the driving shaft side mounting member and the driven shaft side mounting member are made of metal and the rotational force transmitting member is made of plastic in the above embodiment, both of them are made of metal. Or both may be made of plastic.

[0028]

As described above, according to the present invention, it is possible to satisfactorily deal with eccentricity, declination, and thrust movement between the driving shaft side and the driven shaft side, the efficiency of torque transmission is high, and the size is small. There is provided a shaft coupling that can be made compact and has sufficient strength even if it is downsized. Further, according to the present invention, a shaft coupling that can smoothly transmit a rotational force and is easy to maintain is provided.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of a shaft coupling according to the present invention.

FIG. 2 is a perspective view of the shaft coupling of FIG. 1 in an assembled state.

3 is a partially omitted front view of the shaft coupling of FIG. 1. FIG.

FIG. 4 is a vertical sectional view of the shaft coupling of FIG.

FIG. 5 is a partially cutaway exploded perspective view showing a second embodiment of the shaft coupling according to the present invention.

FIG. 6 is a perspective view of the shaft coupling of FIG. 5 in an assembled state.

[Explanation of symbols]

 2 Drive shaft end 2'Drive shaft rotation center 4 Driven shaft end 4'Drive shaft rotation center 6 Drive shaft side mounting member 7,9 Flange 8 Drive shaft side mounting member 10,12 Slide inner surface 14 Rotational force transmission member 15a No. 1 member 15b 2nd member 16 1st slide outer surface 18 2nd slide outer surface 20 Ring-shaped member

Claims (4)

[Claims] 1. A driving shaft side mounting member and a driven shaft side mounting member are arranged so as to face each other, and a pair parallel to a surface in the first direction passing through the axial direction is formed on the driven side end surface of the driving shaft side mounting member. The driving shaft side mounting member is formed with a sliding surface formed in parallel with a surface in the second direction passing through the axial direction at the driving side end surface of the driven shaft side mounting member. And a driven shaft side attachment member, a rotational force transmission member is disposed between the driven shaft side attachment member and the driven shaft side attachment member. A first member having a surface and a second member having a second sliding surface that makes a pair slidable with respect to the sliding surface of the driven shaft side mounting member. The first member and the second member Both ends of are supported by a common ring-shaped member. A shaft coupling, wherein the first member and the second member are positioned adjacent to each other in the axial direction. 2. The driving shaft side mounting member at least the sliding surface and the driven shaft side mounting member at least the sliding surface are made of metal, and the rotational force transmitting member at least the first sliding surface and the second sliding surface are made of plastic. The shaft coupling according to claim 1, wherein 3. The shaft coupling according to claim 1, wherein the rotational force transmitting member is made of a plastic integrally molded product. 4. The shaft coupling according to claim 1, wherein the first direction and the second direction are orthogonal to each other.