JPS6144010Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a universal joint, and more particularly to a two-pot universal joint in which a roller is rotatably mounted on a trunnion shaft protruding from a symmetrical position of the shaft.

In general, constant velocity universal joints used for automobile steering shafts, etc., need to keep play in the rotational and axial directions to a minimum, so those that use balls are not suitable, and cruciform universal joints are not suitable. is also unsuitable because torque fluctuations occur depending on the operating angle. Therefore, it is desirable to use a double two-pot universal joint.

An example of this kind of double two-pot universal joint is one previously proposed by the present applicant, as shown in FIGS. 1 to 3, for example. This double 2-pot universal joint is
Two shafts 1 and 2 for transmitting power are connected by fitting a sphere 3 formed at one end of one shaft into a cylindrical hole 4 formed at the other end of the shaft 2, and connecting these two shafts 1 and 2. Trunnion shafts 5, 5 extending in the diametrical direction are integrally formed near the corresponding tip portions of the trunnion shafts 5, 5,
5, rollers 6, 6 are rotatably attached to the outer member 7, and these rollers 6, 6 are fitted into the connecting portions of the shafts 1, 2. Further, center holes 9, 9 are provided near the tips of the shafts 1, 2, perpendicular to the trunnion shaft 55, and pins 10, 1 are inserted into the center holes 9, 9.
0 is arranged through the pins 10, 10, and the spherical convex portions 10a, 10a provided on the pins 10, 10 are connected to the central portions 9a, 9 of the center holes 9, 9.
9a, and both ends of the pins 10, 10 are fixed to the outer member 7. Power is transmitted between the rollers 6, 6 and the outer member 7 and the trunnion shafts 5, 5. It is carried out between the shafts 1 and 2 via the outer member 7 while performing rolling and rocking movements in accordance with the angular displacement acting on the joint, and when the operating angle is taken,
As shown in FIG.
The operating angle is centered around the spherical convex portions 10a, 10a provided at the center of the spherical convex portions 10a, 10a.

By the way, in the double two-pot universal joint configured as described above, it is possible to adjust the play between the rollers 6, 6 and the raceway surfaces 8, 8 of the outer member 7. However, with preload applied, the rollers 6, 6
If the gap between the rollers 6, 6 and the outer member 7 is reduced to zero to eliminate backlash, there remains the problem that the frictional resistance between the rollers 6, 6 and the outer member 7 increases, resulting in poor operability.

In view of the above-mentioned conventional problems, this invention was developed to improve and eliminate the problems. Two rollers are rotatably mounted on the trunnion shaft, and the contact position of one roller on the raceway surface and the contact position of the other roller on the raceway surface are determined. position approximately
By arranging the rollers at 180° symmetrical positions, the purpose is to provide a universal joint that eliminates play between the rollers and the raceway surface and provides good workability.

This invention will be described below with reference to embodiments shown in the drawings.

In FIGS. 5 to 7, reference numerals 11 and 12 indicate shafts that are driven and connected to each other by a double two-pot universal joint according to this invention, in which a sphere 13 formed at the tip of one shaft 11 and a spherical body 12 formed at the tip of the other shaft 12 A cylindrical body 14 formed at the tip of the cylindrical body 14 is fitted and connected. 15,15
is a trunnion shaft protruding from the shaft center in a symmetrical position near the corresponding tips of the shafts 11, 12 in a radial direction, and rotates two rollers 16, 16 and 17, 17 having different outer diameters. It can be fitted and installed freely. Reference numerals 18 and 18 indicate center holes bored near the corresponding tips of the shafts 11 and 12 so that the trunnion shafts 15 and 15 are perpendicular to each other;
A is formed straight, and its both sides 1
8b and 18b are formed into a funnel shape. 19,
Reference numeral 19 denotes a pin that is disposed through the center holes 18, 18 of the shafts 11, 12, and has a spherical convex portion 19a, 19a formed with a spherical center portion in contact with the center portions 18a, 18a of the center holes 18, 18. I'm letting you touch me. Reference numeral 20 denotes an outer cylindrical member having an irregular cross-sectional shape that is fitted over the connecting portion of the shafts 11 and 12, and is fitted onto the connecting portion of the shafts 11 and 12.
Snap springs 21 and 2 at both ends that protrude from 2.
It is fixed at 1. 22 and 23 are outer members 2
0 inner surface and rollers 16, 16 and 17, 17
One raceway plate 22 is in contact with the large-diameter rollers 16, 16, and the other raceway plate 23 is quenched and hardened by heat treatment.
Elastic bent portions 23a, 23a are bent inwardly at opposing positions of the small diameter side rollers 17, 17.
are provided, and the small diameter rollers 17, 17 are brought into contact with the bent portions 23a, 23a. Therefore, since the bent portions 23a, 23a of the raceway plate 23 have elasticity, the raceway plate 23 presses the trunnion shafts 15, 15 to the left in FIG. The large diameter rollers 16, 16 are pressed against the raceway plate 22 via the rollers 15, 15. As a result, rollers 16, 16 and 1
7, 17 and the raceway plates 22, 23, the large diameter rollers 16, 16 and the raceway plate 22 are in contact and there is a gap between the large diameter rollers 16, 16 and the raceway plate 23, and The small diameter rollers 17, 17 and the raceway plate 23 are in contact with each other, and there is a gap between the small diameter rollers 17, 17 and the raceway plate 22.

According to the double two-pot universal joint, the two rollers 16 and 17 are rotatably mounted on the trunnion shaft 15, and the raceway plate 22 of one roller 16 is attached to the trunnion shaft 15.
The contact position with the raceway plate 23 of the other roller 17
Since the abutment position was set at a symmetrical position of about 180°,
It is possible to eliminate play in the rotational direction without requiring high processing precision, and the two rollers 16 and 1
Since there is a gap between the track plate 7 and the track plates 23 and 22, good operability can be obtained. Further, even when a large torque is applied, the large diameter roller 16 and the track plate 23 come into contact with each other due to the bending of the bent portion 23a of the track plate 23, so that this large torque is supported by the outer member 20. At this time, the contact force between the small-diameter rollers 17, 17 and the raceway plate 23 does not become excessive because the bent portion 23a is elastically deformed.

In the above embodiment, the outer diameters of the two rollers 16 and 17 are made different, but for example, as shown in FIG. If the bent portion 22a is provided by bending and the roller 16 is brought into contact with this bent portion 22a, the two rollers 1
6 and 17 do not necessarily have to have different outer diameters. Further, in the above embodiment, the two rollers 16 and 17 are brought into contact with the raceway plates 22 and 23, but the raceway plates 22 and 23 are omitted, and the rollers 16 and 17 are brought into contact with the inner surface of the outer member 20. The preload may be applied by the elasticity of the square member 20 itself. Furthermore, although the above embodiments are applied to a double two-pot universal joint, the present invention can also be applied to a single two-pot universal joint.

As explained above, this invention forms a trunnion shaft that extends symmetrically in the diametrical direction of the shaft near the tip of the shaft, rotatably attaches rollers to this trunnion shaft, and these rollers are formed on the outer member. In a universal joint that is housed in a track extending in the axial direction, two rollers are rotatably mounted on each of the trunnion shafts, and the contact position of one roller on the track surface and the track of the other roller are fixed. Since the surface contact positions are approximately 180 degrees symmetrical, it is possible to completely eliminate play in the rotational direction without requiring high processing precision, and even in this state good operability can be obtained.

[Brief explanation of drawings]

1 to 4 are drawings showing a double two-pot universal joint previously proposed by the present applicant, in which FIG. 1 is a vertical side view, and FIGS. 2 and 3 are taken along line A-A in FIG. 1. FIG. 4 is a cross-sectional view taken along line B--B, and FIG. 5 to 8 are drawings showing an embodiment of the universal joint according to this invention, in which FIG. 5 is a vertical sectional side view, and FIGS. 6 and 7 are lines C-C and D-D in FIG. 8 is an enlarged view of section E in FIG. 7. FIG. 9 is an enlarged view of section E in FIG. 7 in a state where a large torque is applied, and FIG. 10 is a longitudinal sectional front view showing another embodiment of this invention. 11, 12... shaft, 13... sphere, 14... cylindrical hole, 15, 15... trunnion shaft, 16, 16
... Large diameter side roller, 17, 17... Small diameter side roller, 18, 18... Center hole, 18a, 18a...
...Central part of center hole, 19, 19...Pin, 19
a, 19a... Spherical convex portion, 20... Outer member, 2
1, 21...Snap link, 22, 23...Race plate, 22a, 23a...Bending portion.

Claims (1)

[Scope of utility model registration request] A trunnion shaft that extends symmetrically in the diametrical direction of the shaft is formed near the tip of the shaft, rollers are rotatably mounted on this trunnion shaft, and these rollers are housed in tracks that are formed on the outer member and extend in the axial direction. In the universal joint, two rollers are rotatably mounted on each of the above trunnion shafts, and the contact position of one roller on the raceway surface and the position of contact on the raceway surface of the other roller are approximately 180 degrees. A universal joint characterized by having symmetrical positions.