JPH0743501Y2 - Universal joint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a universal joint used for connecting a propulsion shaft between a transmission output shaft and a final reduction gear in a vehicle, for example.

[Prior Art] The universal joint disclosed in Japanese Utility Model Laid-Open No. 57-53124 has a large shape of the spasda and is difficult to machine. Easy to cause.

The universal joint disclosed in Japanese Patent Laid-Open No. 61-59022 uses a threaded pin as a part of a mechanism for transmitting one shaft to the other shaft, so that the surface pressure of the sliding portion between the pin and the groove is reduced. This is high, and there is a problem that the transmission torque is limited by the lubrication performance of the sliding portion and the strength of the pin.

[Problems to be Solved by the Invention] In view of the above problems, an object of the present invention is to provide a universal joint which is small in size, has a small surface pressure at a sliding portion, and has excellent lubricating performance.

[Means for Solving the Problem] In order to achieve the above object, the structure of the present invention has a spherical surface at the end of the first shaft having a spherical concave portion engaging with a ball provided at the end of the second shaft. A cover having a concave portion is joined, and a groove and a ridge in a meridian direction that engage with each other are provided at an engaging portion between the spherical concave portion of the cover and the bowl body, and an engaging portion between the spherical concave portion of the bowl body and the spherical portion. Further, it is provided with a groove and a ridge in the meridian direction which are out of phase with each other by 90 degrees in phase with the meridian engaging with each other, and the second shaft is projected to the outside from the central hole of the bowl and the cover.

[Operation] Since the spherical portion formed at the end of the second shaft is accommodated through the bowl into the spherical space formed inside the cover at the end of the first shaft, the whole is sealed and lubricating oil is provided. There is no fear of leaking to the outside.

The rotation of the first shaft is transmitted to the second shaft by the engagement between the groove of the cover and the ridge of the bowl and the engagement of the groove of the bowl and the ridge of the ball portion. Because of the engagement, the surface pressure of the sliding portion is small, there is no problem in lubrication, and the durability is high for high transmission torque.

[Embodiment of the Invention] The right half of FIG. 1 is a plan sectional view of a universal joint according to the present invention.
The left half is a side sectional view of the same, and FIG. 2 is an exploded perspective view of the universal joint. As shown in FIG. 2, the universal joint according to the present invention has a first shaft 2 having a spherical concave portion 5 at the center of the flange 3 at the end and a spherical portion 6 engaging with the spherical concave portion 5 at the end. A cover 13 having a second shaft 7, a bowl 8 for accommodating the ball portion 6, a spherical recess 15 for accommodating the bowl 8 and a flange 14.
Consists of.

A pair of arc-shaped ridges 6a extending parallel to the shaft 7 are provided on the hemispherical portion of the sphere 6 closer to the shaft 7. The bowl 8 is on the inside,
A spherical hole 9 preferably having a hemispherical shape and provided with a spherical convex portion 10 on the outer surface thereof, and a conical hole through which the shaft 7 penetrates at the center.
Twelve are provided. The spherical concave portion 9 is provided with a pair of grooves 8b extending in the meridian direction, and the groove 8b is configured to be engaged with the aforementioned ridge 6a. The spherical convex portion 10 has a phase different from the groove 8b by 90 degrees,
A pair of ridges 8a extending in the meridian direction are provided.

The cover 13 has a hemispherical spherical concave portion 15, a conical hole 16 through which the shaft 7 penetrates, and a flange 14 at the opening edge, respectively. The spherical concave portion 15 is provided with a pair of grooves 13b extending in the meridian direction, and is configured to engage the above-mentioned ridge 8a.

The above-mentioned members are assembled as shown in FIG.
That is, the flange 14 of the cover 13 is superposed on the flange 3 at the end of the shaft 2 and is joined to the plurality of bolts 4 by nuts. A gap 17 between the cover 13 and the flange 3 is filled with grease from the nipple 17. Spherical recess of cover 13
At the same time that the bowl 8 is engaged with the bowl 15, the projection 8a of the bowl 8 is engaged with the groove 13b of the spherical recess 15. The spherical portion 6 of the shaft 7 is engaged with the spherical concave portion 9 of the bowl 8 and the spherical concave portion 5 at the end of the shaft 2, and at the same time, the protrusion 6a of the spherical portion 6 is engaged with the groove 8b of the bowl 8. To be done. The shaft 7 is projected to the outside through the hole 12 of the bowl 8 and the hole 16 of the cover 13. An elastic boot 18 that closes the inside of the cover 13 is mounted between the shaft 7 and the cover 14.

Next, the operation of the universal joint according to the present invention will be described.
For example, when the shaft 2 is rotated, the rotation of the shaft 2 is transmitted to the bowl 8 by the engagement between the groove 13b of the cover 13 integral with the shaft 2 and the protrusion 8a, and the rotation of the bowl 8 is transmitted to the bowl 8. It is transmitted to the ball portion 6 by the engagement between the groove 8b and the protrusion 6a of the ball portion 6. In this way, the rotation of the shaft 2 is transmitted to the shaft 7.

In FIG. 1, the bending of the shaft 7 in the left-right direction with respect to the shaft 2 is achieved by the groove-direction sliding of the protrusion 6a with respect to the groove 8b.
Further, as is apparent from FIG. 2, the bending in the direction perpendicular to the paper surface is such that the spherical portion 6 and the bowl 8 are integrally moved and the groove of the cover 13 is moved.
It is reached by sliding the protrusion 8a of the bowl 8 on the groove 13b in the groove direction. Therefore, even if the shaft 7 is tilted with respect to the shaft 2 about the spherical portion 6, sliding of the protrusion 8a in the groove 13b,
Due to the combined movement of the ridge 6a sliding in the groove 8b, the shaft 2
Is transmitted to the shaft 7. Grease is filled in the sliding portions between the grooves and the protrusions, and the inside of the cover 13 is sealed by the boots 18. Therefore, the grease does not leak to the outside, and the overall size is small and the operation is smooth. The clearance between the spherical concave portion 9 and the engaging portion of the spherical portion 6 with respect to the spherical concave portion 5 is adjusted by interposing a shim (not shown) having an appropriate thickness between the flange 3 and the flange 14.

It should be noted that, conversely to the above-mentioned embodiment, each groove 13b, 8b is a spherical convex portion.
The ridges 8a and 6a may be provided in the spherical concave portions 15 and 9 in addition to the spherical concave portion 10 and the spherical portion 6.

[Advantages of the Invention] As described above, the present invention connects the cover having the spherical recess to the end of the first shaft having the spherical recess that engages with the spherical portion provided at the end of the second shaft, and covers the cover. The engaging portion between the spherical concave portion and the bowl is provided with a groove and a ridge in the meridian direction that engage with each other, and the engaging portion between the spherical concave portion and the spherical portion of the bowl has the meridian line that engages with each other. It has a meridional groove and a ridge that are 90 degrees out of phase, and the second shaft projects outside from the center hole of the bowl and the cover, so the whole is small and sealed, so the inside The grease filled in ensures smooth sliding operation between the groove and the ridge, and does not cause seizure.

Since the torque transmission is achieved by the engagement of the groove and the ridge,
The sliding part has low surface pressure and high strength, and has excellent durability.

[Brief description of drawings]

FIG. 1 is a sectional view of the universal joint according to the present invention taken along line I-I in FIG. 2, and FIG. 2 is an exploded perspective view of the universal joint. 2,7: Shaft, 5,9,15: Spherical recess, 6: Sphere, 6a, 8a: Ridge, 8: Bowl, 8b, 13b: Groove, 13: Cover, 12, 16: Hole

Claims (1)

[Scope of utility model registration request] 1. A cover having a spherical concave portion is coupled to an end portion of a first shaft having a spherical concave portion that engages with a spherical portion provided at an end portion of a second shaft, and the spherical concave portion of the cover and the bowl body are joined together. The engaging portion is provided with a groove and a protrusion in the meridian direction that engage with each other, and the engaging portion between the spherical concave portion of the bowl and the spherical portion has a meridian that is 90 degrees out of phase with the meridian engaging with each other. A universal joint that has a groove in the direction and a ridge, and the second shaft is projected outside from the center hole of the bowl and the cover.