DE3206436C2 - Articulated coupling - Google Patents

Abstract

The object of the invention is to simplify a universal joint in such a way that it consists of a few simple parts, so that economical production is possible. In addition, a low-friction torque transmission should be sufficient. To solve this problem it is provided that on both sides of the groove (2) of the guide part (1) guide surfaces with a radius of curvature are provided, the centers of which are arranged on the longitudinal axis (3) of the joint part (1) and that the second joint part (5 ) has an inner part (7) with a bore (8) running transversely to the longitudinal axis (3) and that in the inner part (7) at both ends of the bore (8) support surfaces whose radius corresponds to that of the guide surfaces are provided and that in the Bore (8) of the inner part (7) at least three mutually supporting force transmission members (4) are arranged.

Description

a) the driven coupling half (5) has a continuous transverse to the coupling axis (3) Has bore (8).

b) in the bore (8) the two the torque The transferring balls (4, 9) are freely rotatable and can be rolled between them at least one rotationally symmetrical support body (10, 15, 16) is arranged,

c) on both sides of the groove (2) of the driving coupling half (1) to the center of the joint arranged concentric guide surfaces (18) on which the driven coupling half (5) with support surfaces (19) is supported radially, and

d) the support surfaces (19) are curved with a radius corresponding to the guide surfaces (18) and are arranged at both ends of the bore (8).

from one joint part to the other is carried out by means of two balls. These balls condition in the ball head the inner joint part has relatively deep recesses for receiving or mounting them. Such a ball bearing arrangement has the disadvantage that a relatively large amount of space between the ball and the recess Friction occurs. This in turn results in poor efficiency. For sustainable bes'. iteration Such abuses is a corresponding lubrication of the rolling elements as well as those corresponding to them Slideways required. The lubrication or a device that guarantees this is expensive and also makes the production of such joints more expensive. Such an increase in price is, however, also in the In view of the fact that universal joints are in the rain! high-volume products are not acceptable.

In view of this, the present invention has set itself the task of creating an articulated coupling, by means of which a low-friction torque transmission is guaranteed, and soft from only a few and simple parts, which in turn allow economical production.

This object is achieved according to the invention essentially in that

2. Articulated coupling according to Vnspruch 1, thereby characterized in that the driven coupling half (5) has an inner part (7) designed as a tube assigned. soft by means of its outer jacket surface firmly with the driven coupling half communicates.

3. Articulated coupling according to claim 1, characterized in that the two the torque transferring balls (4, 9) are equal to each other, and their outer diameter is the inner diameter corresponds to the through-hole (S)

4. Articulated coupling according to claim 1, characterized in that between two equally large, the torque-transmitting balls (9) at least three opposite the balls (9) in diameter smaller rotationally symmetrical support bodies (10, 15,! 6) are arranged.

a) the driven coupling half has a through hole running transversely to the coupling axis having

b) the two balls transmitting the torque are freely rotatably mounted in the bore and at least one rotationally symmetrical support body is arranged between these, which can be controlled is.

c) on both sides of a groove of the driving coupling half to the center of the joint concentric guide surfaces are arranged on which the driven coupling ^! fte radially supported with support surfaces, and

d) the support surfaces with one of the guide surfaces corresponding radius are curved and arranged at both ends of the bore.

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for connecting shafts to be connected. This solution proves to be special advantageous that the leadership of the two articulated coupling parts to each other by a relatively simple guide part and by the appropriately designed Inside of the driven coupling shafts is reached. The torque itself is transmitted on the one hand by received in the groove of the guide part, known per se and to that extent also proven rolling elements and, on the other hand, by arranging at least one additional rotationally symmetrical

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Coupling halves, the one - driving - coupling halves one in an axial plane with respect to the Coupling axis extending around an axis extending transversely to this circularly curved and to the coupling center has open groove, in which two diametrically opposed, in one Engaged with the driven coupling shafts mounted balls.

In US-PS 17 63 206 a universal joint was already proposed, which consists essentially of & 5 a fork-shaped outer part and a to it corresponding inner part provided with a ball head. The transmission of torque Shape of rolling elements having balls. Such an arrangement allows a low-friction Achieve power transmission.

In a sensible embodiment of the concept underlying the present invention, it is provided that the driven coupling shaft is assigned an inner part designed as a tube, which by means of its outer jacket surface is firmly connected to the driven coupling shafts

In such an embodiment, it has been found to be advantageous that by using a tube as well as balls as rolling elements, a simple and also economical production is guaranteed. Such components are extremely inexpensive. she

offer themselves just about. to be used in a construction on which the invention is based.

Further features of the invention consist, alternatively, that either the two torque ~ <transmitting balls are identical in size and corresponds! Their AUSST. Diameter to the inner diameter of the through hole, or, d & ß equal between two large, the torque transmitting balls at least three over these balls "Rotationally symmetrical support bodies with a small diameter are arranged.

Even those with these Merknials. A .. * going advantages are evident: Through the use and arrangement of appropriate spacers between r. The actual rolling element used for torque transmission in spherical shape is guaranteed that, with the appropriate rotary setting, the rolling elements used for torque transmission never roll against each other, but instead, as a result of deflection 2 » by means of the support element (s), always in the direction of rotation for the correct and insofar low-friction rolling direction is provided

Preferred embodiments of the invention are shown in the drawing schematically 2>

By using appropriate support elements between the actual torque transmission Serving balls is guaranteed that by the corresponding direction of rotation never the Torque transmission serving balls against one- «ι unroll other, but through the deflection through the The support ball always ensures the correct low-friction rolling direction in the direction of rotation

According to a further essential feature it is provided that two force transmission members Balls and a roller arranged between the two balls are provided.

Here, too, the principle of the corresponding direction of roll is in the case of a vortex movement of the universal joint fulfilled, since the two rolling elements serving for power transmission are located on the one between them Support the roller. In order to achieve a lower surface pressure on the role, it is possible that in this role a groove is arranged which corresponds to the radius of the rolling elements. ■ »'

Preferred exemplary embodiments of the invention are shown schematically in the drawings. It shows

F i g. 1 shows a cross-sectional side view of a universal joint,

FIG. 2 is a further view of the one shown in FIG Universal joint, ίο

F i g. 3 the in F i g. 2 shown universal joint in an angled position, partly shown in section.

FIG. 4 shows a cross section of the one shown in FIG Joint.

Fig. 5 and 6 inner parts of the second joint part as Single part shown in section.

7 and 8 show an assembly position of the universal joint shown in FIG. I, together with FIG. 8th as the direction of insertion for the rolling elements.

The universal joint shown in Fig. 1 consists in essential from the two joint parts, wober one Joint part is designed as a guide part 1. A groove running in the shape of an arc of a circle is located in the guide part 2 arranged to run in the direction of the longitudinal axis 3. The groove 2 is used to accommodate the force transmission members 4. This is in the interior of Kihrungsteües 1 second joint part 5 is arranged, which has a flange 6 for connection to a shaft The second Joint part 5 is with an inner part! 7 provided, which is designed as a tube in this embodiment, in its inner bore 8 the power transmission members

4 are included. In this exemplary embodiment, two balls 9 are used as force transmission members 4 been used, which roll in a corresponding groove 2 of the guide part 1 and between the two Balls 9, a roller 10 is provided as a support element. With this arrangement a third Element is obtained when rolling the balls 9 with respect to the roller 10 corresponding in the same direction directed directions of rotation of these elements 9 and IC.

In Fig. 2, the guide part 1 is closed with a groove 2 recognize, as well as the flange 6 of the second joint part

5 together with its inner part "*. In the inner part 7 is the Bore 8 arranged to accommodate the balls 9 serves

F i g. 3 shows an illustration of the in FIG. 2 shown universal joint in an angled position. at If the joint is angled around a corresponding flexion angle 11, the guide part 1 remains together with the groove 2 in the corresponding position and over the balls 9, the second joint part 5 can be angled will. The inner part 7 is rotated relative to the balls 9. These kinematics correspond exactly that of a conventional universal joint with a cross member.

4 shows a section through such a joint, in which the guide part 1 together with the Groove 2 can be seen, the balls 9 in groove 2 are included. The flange 6 has corresponding fastening bores 12. The second joint part 5 is can only be seen here in section, the inner part 7 in its bore 8, which is the power transmission Take up serving balls 9 and serve as Abstützel.ient the roller 10 is provided, in the groove 13 of which the balls 9 roll. The end faces 14 of the roller 10 are provided with a radius that corresponds to the diameter of the Bore corresponds so that a rotation of the entire part is possible

In Fig. 5 shows an inner part 7 in which in FIG Bore 8 three balls of the same size 9 are added. An additional ball serves as a support element 15. so that uniform elements can be used here.

In Fig. 6, however, is in the bore 8 of the inner part 7 two balls 9 are provided for power transmission, while smaller balls 16 are used as the support element will. At least three smaller balls 16 must be distributed over the circumference here, so that the Kugehi 9 is perfectly static Get support.

The F i g. 7 and 8 show the assembly of such a joint, in which in the guide part 1 the second Joint part. 5. rotated by 90 °, is introduced axially through the insertion opening 17, so that then through the same insertion opening 17, the balls 9 together with the roller 10 in the direction of the longitudinal axis 3 are introduced axially. After the second joint part 5 has been bent back, the joint is ready for use and secured axially at the same time.

In addition 5 sheets of drawings

Claims (1)

Patent claims: 1. Articulated coupling with two coupling halves used to connect to shafts to be connected, wherein the one - driving - coupling half is one in an axial plane with respect to the coupling axis extending, curved circularly about an axis extending transversely to this and to the Coupling center point has an open groove in which two diametrically opposed, in one driven coupling shafts engaged balls, characterized in that