JPS5851452Y2 - universal joint - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a universal joint that is extremely easy to manufacture and has a structure with good torque transmission efficiency.

Conventionally, this type of universal joint has been proposed, for example, as described in detail in Japanese Utility Model Publication No. 52-55569.

However, in the structure detailed in Utility Model Publication No. 52-55569, a connecting head is provided on one of a pair of mutually connected shafts, and this connecting head is fitted onto the other shaft. There is a recess for stopping.

The connecting head has a polygonal cross-section taken along a plane orthogonal to the central axis, and the outer surface is curved so that the cross-sectional area is widest at the middle part of the head and gradually narrows as it approaches the tip and base. It was a universal joint in which the concave portion was formed into a polygonal column shape matching the cross-sectional shape of the connecting head.

Therefore, depending on the connection between the polygonal prism-shaped recess and the outer surface, there is a drawback that a misalignment occurs between the pair of mutually coupled shafts, reducing the torque transmission efficiency. There was a problem in processing that it was difficult to form the recesses.

The object of this invention is to provide a universal joint that overcomes the drawbacks of the prior art described above.

The feature of this device is that at least one side wall with an engaging surface for transmitting rotational force is formed at the end of one of a pair of mutually coupled shafts, and the tip of the shaft is formed on the side wall. The support shaft and the side wall are arranged in parallel with each other, and the end of the other shaft is cut out in the axial direction and on the sides, and the end of the other shaft has a band-shaped convex curved surface, and The universal joint is formed by forming an outer surface that comes into contact with the engagement surface and a recess that fits into the support shaft, and in which the two ends are always elastically biased in the direction of contact with each other.

The following will explain the embodiments shown in the drawings.

1 to 3 show a first embodiment of the present invention. As shown in FIG. 1, the universal joint 1 consists of a driving shaft 2, a connecting shaft 3, and a driven shaft 4 connected in series. There is.

The drive shaft 2 is provided with a rectangular recess 2a at one end thereof.

A coil spring 5 is provided in this concave portion 2a to constantly bias the connecting shaft 3 toward the connecting end 4a of the driven shaft 4.
is installed inside, and this coil spring 5 is in contact with one end of the rectangular connecting shaft 3.

A connecting head 3a for power transmission is formed at the other end of the connecting shaft 3 that the coil spring 5 comes into contact with.

A conical recess 3b" having an apex on the central axis of the connecting shaft 3 is provided at the distal end of the connecting head 3a. Even if the central axes of the driven shaft 2 and the driven shaft 4 are not on a straight line, the rotation is transmitted, so that the cross-sectional area when the connecting head 3a is cut along a plane perpendicular to the central axis is the largest at the middle part of the connecting head. It is a curved surface, that is, a band-shaped curved surface.

FIG. 2 shows the cross-sectional shape of the connecting head 3 at this intermediate portion.

In this embodiment, this curved outer surface 3c
.

3c are positioned opposite to each other.

Further, a support shaft 4b that fits into the recess 3b of the connecting head 3 is located on the central axis of the driven shaft 4, and is provided at the connecting end 4a by a fixing means such as screwing.

A pair of side walls 4c, 4c forming retaining surfaces 4d, 4d that contact the outer surfaces 3c, 3c of the connecting head 3a and transmit rotational force, respectively, are disposed on the connecting end 4a, and They are facing each other.

In the case of the universal joint according to this invention, a centripetal action is exerted between the support shaft 4b of the driven shaft 4 and the recess 3b of the connecting head 3a due to the resilient urging force of the coil spring 5.
Misalignment can be prevented, and therefore the side walls 4c, 4c of the driven shaft 4
This ensures that the outer surfaces 3c, 3c of the connecting head 3 are in contact with each other.

FIG. 4 shows another embodiment of the universal joint according to this invention, in which only one side wall 4C having a retaining surface 4d is provided on the driven shaft 4 instead of providing a pair of side walls 4C.

In this case, it is not necessary to provide a pair of curved surfaces for the outer surfaces 3c and 3c of the connecting head 3a, and only the outer surface 3c on the side that comes into contact with the engaging surface 4d of the side wall 4c may have a curved surface similar to that described above.

In this case, since the drive must be transmitted through only one side wall 4c, it is necessary to increase the strength of the support shaft 4b and the side wall 4c compared to the previous embodiment.

As explained above, this device is configured so that the centripetal action acts at the connecting ends of the pair of shafts, so it has the effect of increasing the transmission efficiency. Since it is not necessary to form a universal joint, it is also possible to easily manufacture the universal joint.

[Brief explanation of the drawing]

Fig. 1 is a partial side view partially showing the structure of the universal joint of this invention, Fig. 2 is a sectional view of the universal joint of Fig. 1 as seen from the 1-1 line direction, and Fig. 3 is a partial side view of the universal joint of this invention. FIG. 4 is a partially exploded perspective view of a universal joint according to the invention, and FIG. 4 is a partial side view showing another embodiment of the universal joint according to this invention. 1...Universal joint, 3...Connection shaft, 3a
......Connection head, 3b...Concave part, 3c.
...outer surface, 4...driven shaft, 4a...
...Connection end, 4b...Support shaft, 4d...
...Engagement surface, 5... Coil spring.

Claims (1)

[Scope of utility model registration request] At least one side wall provided with an engagement surface for transmitting rotational force is formed at the end of one of the pair of shafts to be mutually coupled, and the shaft tip is formed in the axial direction and side while leaving the side wall. one side is notched, a support shaft and a side wall located on the central axis of the shaft are arranged in parallel with each other, and the end of the other shaft has a band-shaped convex curved surface,
The universal joint further includes an outer surface that abuts the engagement surface and a recess that fits the support shaft, and the two ends are constantly elastically biased in the direction of contact with each other.