JPH02261926A - Universal joint - Google Patents

Abstract

PURPOSE:To absorb the eccentricity and the deflection angle sufficiently, and eliminate the back rush, and enlarge the torsional rigidity by connecting a first projecting part and a second projecting part of an intermediate ring to a first recessed channel and a second recessed channel of an input buff through an elastic linear material. CONSTITUTION:When the rotation is applied to an input shaft 10, the rotation is transmitted to an input hub 13 connected to the input shaft. When the input hub 13 is rotated, the rotation is transmitted to an intermediate ring 15 by pulling a first projecting part 19 inside of a first recessed channel 18 with a wire passing through a through hole formed in a step 16. Wen the rotation is transmitted to the intermediate ring 15, the rotation is transmitted from a second projecting part 21 to a step 22 through a wire in the same way, and an output hub 14 is rotated to transmit the rotation to an output shaft 11. In the case that the eccentricity and the deflection angle are generated in the input shaft 10 and the output shaft 11, since the intermediate ring 15 is floated by a wire 20, first and second projecting parts 19, 21 are oscillated in the first and the second recessed parts 18, 22 to absorb the eccentricity and the deflection angle.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a universal joint that transmits rotational force between an input shaft and an output shaft via an intermediate ring.

<Prior art> Joints are generally used to connect shafts. This joint is mainly used under constant rotation, and is intended to accurately transmit torque, and is used to connect a servo motor with an encoder or feed screw, and is used to transmit rotation angle more accurately than torque transmission. There is a purpose. The former includes hook joints, etc., in which a cross-diameter intermediate pin is rotatably connected to U-shaped hooks formed on two rotating shafts, and because the purpose is to transmit rotation, the load capacity and durability are limited. However, in the latter case, rotation and stopping are often repeated, and problems such as baracula/touch and torsional okagaki occur. Also, the important role of the joint is to absorb eccentricity and declination between the shafts. For this reason, conventionally, the shafts are connected to each other via a plate spring or a coil spring, or an intermediate member is arranged between two rotating shafts, and a convex part is formed perpendicular to the intermediate member and one of the rotating shafts. On the other hand, there was an Oldham type shaft joint that had a groove that fit loosely into the convex part.

<Problems to be Solved by the Invention> However, none of the above-mentioned products satisfactorily satisfies all of the requirements such as being able to sufficiently absorb eccentricity and declination, having no backlash, and having high torsional rigidity.

Means for Solving the Problems> The present invention has been made to satisfy all of the above-mentioned requirements, and includes an intermediate ring disposed between the input shaft and the output shaft, and a second ring disposed between the intermediate ring and the input shaft. a first convex portion is formed on the other side, a first concave groove that fits with the first convex portion with a gap is formed, and a second concave groove that extends in a direction perpendicular to the first convex portion is formed on one of the output shaft and the intermediate ring. A convex portion is formed on the other side, and this second
forming a second groove that fits with the convex part with a gap, and connecting the manpower shaft or intermediate shaft in which the first groove is formed and the first convex part in the circumferential direction with a bendable elastic wire; The input shaft or the second convex portion of the intermediate shaft having the second concave groove formed therein is coupled in the circumferential direction with a bendable elastic wire.

In addition, the above-mentioned No. 1. The radial end surface of the second convex portion and the axial end surface of the second groove are connected by a plate spring twisted by 90 degrees.

<Operation> When connected using an elastic wire member, the input shaft and output shaft are rigid in the rotational direction due to the axial rigidity of the elastic wire member, so rotational force is reliably transmitted and the input shaft and output shaft are By curving the wire member in the axial and radial directions, it is possible to absorb eccentricity and deviation of the shaft. Similarly, in the case of a temporary spring twisted by 90 degrees, the rotational force is transmitted reliably in the rotational direction of the input and output shafts, and since there is elastic force in the axial and radial directions, the spring bends and prevents eccentricity of the shaft. It can sufficiently absorb the declination angle.

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

In FIG. 1, 10 is an input shaft, and 11 is an output shaft. These input shafts 10 and output shafts 11 have an input hub 1
3 and an output hub 14 are connected to each other. An intermediate ring 15 is arranged between the input hub and the output hub. On the end surface of the human power hub 13, a fan-shaped stepped portion 16 is formed with a length of 1 m in the vertical direction in the drawing, and a cutout portion 17 is formed in the horizontal direction. A first groove 18 is formed in this stepped portion 16, and a first convex portion 19 formed in the longitudinal direction of the circumference of the intermediate ring 15 is formed in the first groove 18 with a gap in the axial and radial directions. They are mated together. A through hole 9 is formed in the circumferential direction of the stepped portion 16, and a first through hole 9 is formed in the circumferential direction of the stepped portion 16.
As shown in FIG. 2, a wire 20 is passed through the convex portion 19 and the step portions 16 located on both sides. This wire 20 is welded to both ends of the through hole and to the first convex portion 19. This allows the intermediate ring 15 to swing in the radial and axial directions. A second protrusion 21 is formed on the circumference of the intermediate ring 15 and extends in a direction perpendicular to the first protrusion 19 . Opposite to the input hub, the output hub 14 is formed with a fan-shaped stepped portion 22 in the horizontal direction and a notch portion 23 in the vertical direction, and the stepped portion 22 is formed with a gap between the second convex portion 21 and the stepped portion 22 . A second groove 24 that fits is formed. A through hole 9 is formed in the circumferential direction of the stepped portion 22 in the same manner as the stepped portion 16, and the through hole 9 has a second convex portion 21 and stepped portions 22 located on both sides as shown in FIG. Wire 20 as shown
is being passed. This wire 20 is welded to both ends of the through hole 9 and to the second convex portion 22 . Further, the stepped portion 16
and the notch 23 are fitted with a gap, and the stepped part 22 is fitted in the same way.
and the notch 17 are fitted with a gap.

The input shaft 10 with the above configuration and its operation will be explained.
When rotation is applied to the input hub 13, the rotation is transmitted to the connected input hub 13. When the input hub 13 rotates, the first groove 1
The first convex portion 19 within the ring 8 is pulled by the wire 20, and rotation is transmitted to the intermediate ring 15. When the rotation is transmitted to the intermediate ring 15, the wire 2 is transferred from the second convex portion 21 to the stepped portion 22.
0, the output hub 14 rotates, and the rotation is transmitted to the output shaft. In addition, the input shaft 10 and the output shaft 11
If there is eccentricity or declination, wire 202 fi
Since the intermediate ring is floating due to the first. The second convex portion 19.21 swings within the 1° second concave portion 1B, 24, and can absorb eccentricity and declination. In addition,
This wire 20. It is also possible to replace the =2″ pin with a small diameter pin.

Further, as shown in FIG. 3, by connecting the end surface of the stepped portion 16 facing the output hub 14 and the upper surface of the first convex portion 19 with the leaf spring 30 twisted by 90 inches, the temporary spring 30 is aligned in the axial direction. Since it flexes only in the radial direction and not in the rotational direction, it absorbs eccentricity and angular deviation, making it possible to accurately transmit rotation.

<Effects of the Invention> As described above, in the present invention, both ends of the first convex portion and the first concave groove and the second convex portion and the second concave groove are connected by an elastic wire or a plate spring twisted by 90 degrees. This has the advantage that it can sufficiently absorb eccentricity and declination, provide a universal joint with no backlash and high torsional rigidity.

[Brief explanation of drawings]

The drawings are for explaining the present invention in detail, and FIG. 1 is an exploded perspective view for explaining the structure of a universal joint, FIG. 2 is a sectional view of essential parts of a universal joint according to the first embodiment, and FIG. The figure is the second
FIG. 2 is an enlarged view of the main part of the embodiment. 10... Input shaft, 11... Output shaft, 13... Input hub, 14... Output hub, 15... Intermediate ring, 1
8... First concave groove, 19... First convex portion, 20 Two-piece stand.
... Wire, 21 ... Second convex portion, 22 ... Second groove, 30 ... Temporary spring.

Claims (2)

[Claims] (1) An intermediate ring is arranged between the input shaft and the output shaft, a first convex portion is formed on one side of the intermediate ring and the input shaft, and a first concave portion that fits with the first convex portion with a gap is formed on the other side. a second convex portion extending in a direction orthogonal to the first convex portion is formed on one of the output shaft and the intermediate ring, and a second concave groove that fits with the second convex portion with a gap on the other side; and this first
The input shaft or the intermediate shaft having the concave groove formed therein and the first convex portion are coupled in the circumferential direction with a bendable elastic wire material, and
A universal joint characterized in that the second convex portion of the input shaft or intermediate shaft having a groove formed therein is connected in the circumferential direction with a bendable elastic wire. (2) An intermediate ring is arranged between the input shaft and the output shaft, a first convex portion is formed on one side of the intermediate ring and the input shaft, and a first concave portion that fits with the first convex portion with a gap is formed on the other side. a second convex portion extending in a direction orthogonal to the first convex portion is formed on one of the output shaft and the intermediate ring, and a second concave groove that fits with the second convex portion with a gap on the other side; forming the first
A universal joint characterized in that the radial end face of the second convex portion and the axial end face of the first and second grooves are connected by a plate spring twisted by 90°.