JPH02225824A - Universal coupling - Google Patents

Abstract

PURPOSE:To reduce howling noise at time of rotation and to have a connection state between a driving axis and a driven axis maintained at the time of pin damage by putting a flexible ring between the first and the second sleeves so that displacement of a central axis of the driving axis and the driven axis is capable. CONSTITUTION:A universal coupling is formed by the first sleeve 1 engaged with a driving axis A and the second sleeve 2 engaged with a driven axis B through a flexible ring 3 made of spring steel. In both the sleeves, collets 5 are attached to each of cylinder-shaped sleeve bodies 4 and the collets 5 are held by cap screws 6 engaged with the inner sides of base ends of the sleeve bodies 4. When one of the axes is inclined in the direction of an arrow 14 and displaced, a side of the flexible ring 3 is deflected and displacement of the axis is absorbed, and displacement of the axis in all the directions including the displacement in the parallel direction can be absorbed by the flexible ring 3. Moreover, as the flexible ring 3 is a ring and its restoring force is strong, it is quickly restored when the axis returns to a predetermined position.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a universal coupling used to connect two rotating shafts whose central axes are substantially aligned.

(Prior Art) Various camp rings are used as devices for connecting a drive shaft of a motor to a driven wheel. Even when the drive shaft and the driven wheel are designed so that their central axes coincide, in many cases a universal coupling is used as the coupling.

This is because the center shaft, which is defective in design, may shift slightly during installation of equipment, and the shaft shake due to vibrations that occur during operation must be absorbed by the coupling. be.

However, since the center shift that needs to be absorbed by the coupling is extremely small, it is sufficient that the drive shaft side and the driven wheel side of the compulsion are displaced by a small angle.

By the way, a typical coupling that has been used in the past has a structure in which two flanged collets are connected via a temporary spring interposed between the flanges in parallel with the flanges.

(Problems to be Solved by the Invention) According to the above-mentioned conventional universal coupling, although sufficient displacement between the drive shaft side and the driven wheel side can be obtained, there is a problem in that it generates extremely loud wind noise when rotating. there were. This is due to the large unevenness of the outer surface in the direction of rotation, and it has been structurally impossible to improve wind noise. For this reason, when using conventional couplings, the actual situation is to put a cover over the compulsion ring for soundproofing.

In addition, the flange and leaf spring are connected using screws, but if one screw breaks during rotation, the balance of force applied to the other screws will be disrupted, and the other screws will also break instantly, causing the cup to break. There was a risk that the ring would fall apart.

(Means for Solving the Problems) The universal coupling of the present invention includes a first sleeve fitted to one shaft, a second sleeve fitted to the other shaft, and a first sleeve fitted to the other shaft. The tongues protruding from the tips of both sleeves are connected to the flexible ring by pins, and the tongues protruding from both sleeves are diametrically symmetrical. It is arranged and configured.

The bending ring may be a cylindrical integral body, or may be constructed by combining two pieces of arc-shaped spring steel.

(Operation of the Invention) In this invention, the flexible ring is interposed between the first sleeve and the second sleeve, so that the central axes of the driven wheel and the drive shaft can be displaced. Since the entire body is cylindrical, there are few irregularities on the outer surface, and wind noise generated during rotation is also reduced as much as possible. In addition, even if the pin connecting the flexible ring and the tongue is damaged due to an accident, the drive shaft and driven wheel will be maintained in a connected state by the engagement of the tongues protruding from both sleeves, and the coupling will remain intact. There is no risk of it falling apart.

Embodiments of the present invention will be described below based on the drawings.

(Example 1) As shown in FIG. 1, a first sleeve 1 fitted to the drive shaft A and a second sleeve 2 fitted to the driven shaft B are connected by a flexible ring made of spring steel. The universal force of this invention, bling, is comprised through 3.

As shown in FIGS. 2 and 5, each of the sleeves has a collet 5 fitted into the cylindrical sleeve body 4, and the collet 5 is screwed inside the proximal end of the sleeve body 4. It is configured to be held down by a cap screw 6.

The sleeve main body 4 is made of iron, and its inner wall has a tapered surface 7 (taper angle of 3 degrees),
A tongue piece 8 is provided protruding from one side of the tip. As shown in FIG.
It has a width of about 3 mm, and its center part is an arcuate part 8a that comes into contact with the flexible ring 3, and both sides thereof have cutout parts 8b that do not come into contact with the flexible ring.
The end of the notch 8b is a rounded portion 8 located slightly inside the flexible ring 3 (about l+n for a ring diameter of 30).
It is c.

Two screw insertion holes 9 are formed in each of the tongue pieces 8, and the tongue pieces 8.8 of both sleeves are fixed diametrically symmetrically by the screws 10 inserted into the insertion holes 9. 1st year of junior high school
1 is a washer, 12 is a nut, and both the washer and the nut have the same length as the flexible ring 3, and the flexible ring 3
It has the function of suppressing the

The collet 5 is made of aluminum and has a slit 13 formed therein, and its outer wall has a tapered surface that matches the tapered surface 7 of the sleeve body 4, and the shafts A, B are fitted into the collet 5. By later tightening the cap screw 6, the shaft is evenly tightened from the circumference by the inner wall of the collet 5, and the shaft center is not shifted and is firmly fixed.

According to this embodiment, for example, one axis is
If the flexible ring 3 is tilted and displaced in the direction indicated by arrow 15, one side of the flexible ring 3 will be bent, and the displacement of the shaft will be absorbed. The deflection ring 3 can absorb the displacement of the shaft in all directions including the displacement in the parallel direction as shown in FIG. Furthermore, since the flexible ring 3 is a ring, it has a strong restoring force, and when the shaft returns to a predetermined position, it returns quickly.

However, since it is preferable that the flexible ring 3 maintains a perfect circle, the rounded portions 8C are provided at both ends of the tongue piece 8, and if the flexible ring 3 is to be deformed in an elliptical direction beyond a certain level, the flexible ring 3 is The inner side abuts against the rounded portion 8C to prevent deformation beyond a predetermined level. However, such a configuration is not an essential requirement.

(Embodiment 2) Next, another embodiment of the present invention shown in FIGS. 6 and 7 will be described.

This embodiment has the same basic structure as the first embodiment, but differs in the structure of the deflection ring and shaft tightening device.

That is, for the flexible ring, two arc-shaped spring steels 3a and 3b are used, both ends of one spring steel 3a are overlapped on the outside of the other spring steel 3b, and a tongue piece is attached to the overlapped part. The flexible ring 3 is constructed by connecting two pieces of spring steel by inserting a fixing screw 10 therethrough. The screw 10 is tightened with a screw 16 on the inside of the tongue.

Next, the structure of the shaft tightening device is as follows.

The inner side of the base of the sleeve body 4 is straight, and a taper flange 19 having a thick tapered surface (approximately 1.5 degrees > 17 and a flange 18 at the base) is fitted therein. The tapered surface 17
A collet 20 with a slit corresponding to the slit is fitted.

The base of the collet 2° projects outside the flange 19 and has a thread formed on its outer periphery, into which a cap screw 21 is screwed. When the J-cap screw 21 is tightened, the taper flange 19 is pressed and the collet 20 is attracted, so the inner diameter of the collet is narrowed and the attached shaft is tightened evenly from the periphery. At this time, the tapered flange 19 expands outward, so that the tapered flange and the sleeve body are tightly fixed.

In each of the above embodiments, since the sleeve body 4 is cylindrical, there are almost no irregularities in the direction of rotation of the outer side of the camp ring, and almost no wind noise is generated during rotation.
However, even if the coupling has a polygonal shape instead of a cylinder, the unevenness is extremely small compared to conventional couplings, and the effect of reducing wind noise can be obtained. Included in technical scope.

In each of the above embodiments, the collet 5 or 20 is used to tighten and fix the arm shaft, so that the shaft receives uniform force from the surroundings and is fixed, and there is no movement of the center of the shaft. Therefore, as long as the centers of the two collets are aligned, the axes A and B can be connected with their centers aligned. Furthermore, by replacing the collet, it is possible to easily connect shafts with different diameters. Therefore, unlike conventional couplings, there is no need to reshape the fitting hole to match the shaft diameter, and the coupling can be installed with a single touch. If necessary, insert the cap screw into the collet 5 through the holo set.
Alternatively, by fixing it to the tapered flange 19, loosening of the cap screw can be reliably prevented.

However, the use of a collet is not an essential requirement of this invention, and the connection structure with the shaft can be arbitrarily selected.

Further, although in this embodiment the flexible ring 3 is fitted on the outside of the tongue 8, it may also be fitted on the inside of the tongue.

In addition, in the drawing, the length of the flexible ring 3 corresponds to the tongue piece 8, but the flexible ring 3 may be longer than the tongue piece, and the shape, length, and number of fixing screws of the front part may vary depending on the transmission. It can be selected as appropriate by taking into consideration the required torque and other conditions. It is also possible to shorten the overall length of the coupling by making the flexible ring long enough to reach about the middle of the sleeve body, and the tongue pieces being long enough to form a through hole.

(Effects of the Invention) According to the present invention, the displacement of the central axis occurring between the first sleeve fitted on one shaft and the second sleeve fitted on the other shaft is This is absorbed by the flexural deformation of the flexure ring installed between them, and the possibility that the displacement of one shaft will affect the other shaft is prevented.

Further, since the only members appearing on the outside are the sleeve and the flexible ring, there are few irregularities on the outside, and wind noise, which has been a problem in the past, can be reduced as much as possible. Moreover,
Since the number of parts is reduced and no adjustment is required during assembly, it also contributes to improved productivity and reduced costs.

[Brief explanation of the drawing]

Fig. 1 is a front view of an embodiment of the present invention, Fig. 2 is a sectional view, Fig. 3 is an exploded perspective view, Fig. 4 is a side view of the sleeve body, and Fig. 5 is an exploded perspective view of the sleeve. , FIG. 6 and FIG. 7 show other embodiments, and FIG. 6 is a sectional view,
FIG. 7 is a perspective view of the flexure ring. 1.2... Sleeve 3... Deflection ring 4...
Sleeve body 5... Collet 6.21... Cap screw 7.17... Tapered surface 8... Tongue piece 8a... Arc-shaped part

Claims (1)

[Claims] 1. Consisting of a first sleeve fitted to one shaft, a second sleeve fitted to the other shaft, and a flexible ring fitted across both sleeves. , the tongues protruding from one side of the ends of both sleeves and the bending ring are connected by a pin, and the tongues of both sleeves are arranged diametrically symmetrically;
The universal coupling 3 according to claim 1, wherein the flexible ring is constructed by combining two pieces of arc-shaped spring steel, and the sleeve includes a sleeve main body having a tongue protruding from one side of the tip; A taper flange having a thick tapered surface on the inside, a flange formed at the base, and fitted into the sleeve body, a collet having an outer peripheral surface corresponding to the tapered surface and having a slit formed therein, and a base of the collet. A universal coupling 4 according to claim 1, comprising a sleeve main body having a tapered surface on the inside and a tongue protruding from one side of the distal end; 2. The collet according to claim 1, comprising: a collet with a slit that has an outer peripheral surface corresponding to the tapered surface and is fitted into the sleeve body; and a cap screw that is screwed into the base of the sleeve body and presses the collet. universal coupling