WO2000073674A1

WO2000073674A1 - A ball coupling

Info

Publication number: WO2000073674A1
Application number: PCT/CN2000/000133
Authority: WO
Inventors: Jiqing Liu; Yi Tan; Xianao Yin
Original assignee: Jiqing Liu; Yi Tan; Xianao Yin
Priority date: 1999-05-28
Filing date: 2000-05-29
Publication date: 2000-12-07
Also published as: CN2378570Y; AU4908700A

Abstract

A ball coupling comprises a driving member (1), a plurality of balls (2) and a driven member (3), wherein the opposite faces, for connecting the driving member (1) and driven member (3), which a gap (5) is provided there between, have concave and convex which face staggeringly to each other, each of said balls (2) with a diameter larger than the gap (5) is disposed in a rolling slot (4) which is formed in the side of the concave and convex. The ball coupling of the invention has some advantages, such as, large load capacity, high efficiency in anti-shock, adaptable to couple two shafts which have larger crossing angle of their axes, insensitive to the alignment of the two coupled shafts, long service life and so on.

Description

TECHNICAL FIELD The present invention relates to a coupling, and more particularly to a ball coupling. The prior art coupling is a device that is widely used in the industrial field. In order to meet the needs of different industries or occasions, people have developed different couplings, such as rigid couplings, toothed couplings, + -slide couplings, universal joints, reed couplings And ball couplings. However, the existing couplings have such disadvantages. Such wheel couplings are mainly transmitted by teeth. The angle of intersection may change at any time during work. When the intersection angle changes, the tooth contact is a point contact, so the transmission torque is small, the service life is low, at the same time, the tooth processing is difficult, the cost is high, and the lubrication condition is poor. Cross universal coupling is a widely used coupling at present, but there are still some shortcomings: the manufacturing process of the arc guide groove is complicated, the coupled shaft cannot have axial displacement, the ball and the active and passive parts There is sliding friction between them, the service life is short, the transmission efficiency is low, and the maximum stress point contact is the contact between the ball and the sharp corner, which generates additional force and has a small load bearing capacity. Chinese utility model patent 90215888.0 discloses a ball coupling. The opposing surface of the driving member and the driven member of the ball coupling for coupling is a cylindrical surface with a gap therebetween. Balls with a diameter larger than the gap are embedded in the master and slave. In the rolling groove between the moving parts, the best force-receiving part of the ball, namely the distribution circle, is located in the gap area. However, this kind of ball coupling force transmission is achieved by rolling grooves on the driving member and the corresponding cylindrical surface of the driven member to press and cut the ball spherical surface, because the cylindrical surface under force is less than 1/4 circumference This results in a small bearing capacity and poor impact resistance, and it is easy for the cylindrical surface of the rolling groove to be crushed and fail, which affects the service life of the coupling. When the coupled shafts cross, the The gap increases on one side and decreases on the other side. The ball cannot be held in the center of the cylindrical surface, which causes the radial positioning of the ball in the cylindrical surface to fail. The effective bearing area is further reduced, which adversely affects the service life of the coupling: Balls can only roll axially in a cylindrical surface It cannot move in the radial direction, because the parallel alignment facing the coupled shaft is relatively high. OBJECTS OF THE INVENTION The object of the present invention is to provide a ball coupling with large bearing capacity, good impact resistance, suitable for coupling with larger cross-angle shafts, low parallel alignment requirements for the coupled shafts, and long service life. SUMMARY OF THE INVENTION The present invention provides a ball coupling, which includes a driving member, a ball, and a driven member, wherein the opposing surfaces ω of the driving member and the driven member used for coupling are staggered with a gap, The ball is installed in a rolling groove formed on the side of the concave and convex portion, and the diameter of the ball is larger than the gap between the driving member and the driven member.

According to the ball coupling of the present invention, the gap is located at both pole portions of the ball.

Compared with the prior art, the ball coupling of the present invention has the following advantages:

1. The transmission of force is achieved by directly pressing the ball spheres on the corresponding surfaces of the driving and driven parts by rolling. Since the gap is located at the poles of the ball, the round part of the ball contacts the rolling groove, so the effective bearing area is increased. Improved carrying capacity and impact resistance, and long service life;

2. When the coupled shafts cross, the ball center of the ball can always be maintained at the intersection of the center line of the working surface of the rolling groove, the effective bearing area remains unchanged, and it can be applied to the connection of larger cross-angle shafts without affecting the joint. Service life of the shaft;

3. The ball can roll both axially and radially in the rolling groove, so the parallel alignment requirements of the coupled shaft are low. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of an embodiment of a ball coupling of the present invention. FIG. 2 is a sectional view of the ball coupling shown in FIG. 1.

FIG. 3 is a cross-sectional view of the ball coupling shown in FIG. 1 when the coupling shaft crosses.

Figure 4 shows the state of the ball under stress.

Codes in the picture: 1. Active part 2. Ball 3. Follower 4. Rolling groove

5. Gap 6/8, concave 7/9, convex 10, distribution circle 1 1, two poles The best way to implement the present invention The following describes an embodiment of the ball coupling of the present invention in more detail with reference to the drawings. It should be understood that the present invention is not limited to the embodiments.

In Fig. 1-3, the opposite surfaces of the driving member 1 and the driven member 3 for coupling are uneven with gaps 5 and the balls 2 are mounted on the sides of the concave and convex portions 6, 8, and 7, 9 of the driven members 1, 2. In the opened rolling groove 4, the diameter of the ball 2 is larger than the gap 5 between the driving member 1 and the driven member 3.

As shown in FIG. 1 and FIG. 2, the effective contact area between the working surface of the rolling groove 4 of the ball 2 on the driving member 1 and the driven member 3 and the ball 2 increases, that is, the gap 5 is located at the two pole portions of the ball 2, and the ball 2 The distribution circular portion 10 is in contact with the rolling groove 4 so that the bearing capacity and impact resistance of each ball 2 are improved, and the additional pressure caused by the asymmetric distribution of the working surface pressure can be eliminated.

As shown in FIG. 3, when the coupled shafts of the driving member 1 and the driven member 3 intersect, since the gap between the driving member 1 and the driven member 3 is located in the area of the poles 11 where the ball 2 bears very little load, the driving force is increased. The gap between the element 1 and the follower 3 will not substantially weaken the bearing capacity of the ball 2 and its rolling groove 4 on the working surface contact surface of the driver 1 and the follower 3, but under the constraint of the working cylindrical surfaces on both sides The center of the sphere is always maintained at the intersection of the centerlines of the two working surfaces of the rolling, and it continues to work in a good state. The transmitted torque is not affected, so a larger axis crossing angle is allowed, up to 18 °. .

As shown in Figures 1, 2, and 3, because the pressured surface of the ball 2 is lengthened, and the symmetry plane of the two pressured surfaces is close to the axis of the coupling, the surface contact state has changed fundamentally. The rolling concavo-convex rolls in the axial direction of the coupling and can also roll in the radial direction, which reduces the parallel alignment requirements of the coupled shafts of the driving member 1 and the driven member 3, so that the ball coupling provided by the present invention Not only can easily and efficiently connect cross misaligned shafts, but also Connect poorly aligned shafts.

As shown in FIG. 4, the stress situation of the ball 2 is shown. Referring to FIG. 1, when the driving member 1 rotates in the counterclockwise direction R, the ball 2 is subjected to a relatively uniform compressive stress under the force F.

To sum up, since the ball coupling of the present invention adopts a concave-convex staggered surface with gaps on the opposing surfaces of the driving member and the driven member, the ball is installed in a rolling groove opened on the side of the omega convex portion. The gap between the workpiece and the driven part is located at the poles of the ball. The driving part and the driven part do not directly contact each other. When the relative position changes, the ball performs a pure rolling motion in the middle, and the friction loss is small. The rolling groove contains the ball with the same diameter, and the contact compressive stress distribution is relatively uniform. The distribution center is located in the solid central area of the rolling groove shaft section, and the resultant force passes through the center of the ball, giving it a large bearing capacity, good impact resistance, It is suitable for shaft coupling with larger cross angles, and has the advantages of low parallel alignment requirements for the shafts to be coupled, long service life, etc. The invention is applicable to various couplings.

A comparison of the ball coupling of the present invention with some existing couplings is shown in the table below.

Comparison of the invention with other couplings

* ΐ. The more. The better the performance

INDUSTRIAL APPLICABILITY The ball coupling of the present invention can be widely used for coupling between various shafts, and has large bearing capacity, good impact resistance, suitable for coupling with larger cross-angle shafts, and parallel pairs of coupled shafts. Low to medium, long life.

Claims

Claim, a ball coupling, comprising a driving member (1), a ball (2) and a driven member (3), characterized in that the driving member (1) and the driven member (3) are opposite surfaces for coupling The bumps are staggered with a gap (5), and the balls (2) are installed in the rolling grooves (4) on the side of the bumps. The diameter of the balls (2) is larger than the driving member (1) and the driven member.

(3) The gap (5).

The ball coupling according to claim 1, characterized in that: the gap (5) is located at the poles of the ball.