JPS5929150Y2 - universal joint - Google Patents

Description

[Detailed description of the invention] This invention is based on three
The present invention relates to a universal joint having rollers, and particularly relates to a universal joint in which m during torque transmission is taken into consideration.

Conventionally, this type of universal joint has an outer ring 2 fixed to the end of a first shaft 1, as shown in FIG. Tripod shafts 3 are fixed, and these tripod shafts 3 have a spherical surface 4 on the outer periphery.
The cylindrical inner circumferential surface 6 of the roller 5, on which the roller 5 is formed, is covered.

The shaft 7 of the second option has a large diameter at its end, and three cylindrical inner circumferential surfaces 8 are formed there in parallel with the axis of the shaft 7. By being crowned with 5,
The first shaft 1 and the second shaft T transmit torque via rollers 5.

When transmitting torque by intersecting the first and second shafts 1 and 7, the roller 5 rotates around the axis of the tripod shaft 3 and simultaneously moves in the axial direction of the tripod shaft 3. While moving in the longitudinal direction of the cylindrical inner circumferential surface 8 of the shaft 7 of 2, the torque of both shafts is transmitted, and the moment 11iffi of the shafts 1 and 1 is
It is a constant velocity universal joint in which the rotational angular velocity of both shafts is made the same by sequentially changing the center.

Next, what is shown in FIG. 2 is another conventional example, in which the tripod shaft 3 is fixed to the second shaft 7, and the roller 5
is supported by a cylindrical inner circumferential surface 8 formed on the first shaft, and has the same function as that shown in FIG.

When such a universal joint is used with the drive shaft and driven shaft intersecting, the instantaneous rotation centers of both shafts do not coincide as described above, and the instantaneous rotation centers of both shafts are always at different positions.・The rotational angular velocity of both axes is assumed to be the same.

In this case, the rollers 5 perform a relative sliding motion around the axis of the tripod shaft 3 and in the axial direction at a period equal to or twice the revolution period of the driving shaft and driven shaft, so that wear of the fitting surface and Seizing occurs early and the wear life between the roller 5 and the tripod shaft 3 becomes the key to extending the life of the joint.
Conventionally, various measures have been taken such as improving the surface roughness of the resting surface, lowering the surface pressure, and improving the warming agent, but none of them were effective because they did not directly warm the resting surface.

What is shown in Figure 3 is the roller 5 and tripod''@
In this case, it is effective for the rotation of the roller 5 around the axis of the tripod shaft 3, but it is effective for the rotation of the roller 5 in the axial direction of the tripod shaft 3. Regarding movement, it cannot be said that consideration has been given to wear and tear, and this cannot be said to be an effective measure as it increases the number of parts.

Taking these facts into consideration, the present invention provides a universal joint that can minimize the decrease in strength of the tripod shaft, improve lubricity, and improve durability. A gap is provided between the outer end of the tripod shaft and the inner circumferential surface of the roller by cutting out a portion of the first shaft in the axial direction, and this gap is used as a grease reservoir to maintain the temperature between the tripod shaft and the roller. It is something.

Embodiments of the universal joint according to the present invention will be described below with reference to the drawings.

The universal joint of the embodiment shown in FIGS. 4 to 6 has a first shaft 1, a roller 5, and a tripod having a cylindrical inner peripheral surface 8, similar to the conventional universal joint shown in FIG. The shaft 3 and the second shaft 7 are arranged in the same shape as the conventional shaft except for the cap and the tripod shaft 3.

In addition to what is shown in FIG. 2, this tripod shaft 3 includes:
A notch io is formed along the axial direction from the outer end of the tripod shaft 3.
, il are formed.

As shown in FIGS. 5 and 6, this notch 10.11 is parallel to the tangent of the round shaft so as to form a chord of the tripod shaft 3, which is a round shaft when viewed along the axial direction of the tripod shaft 3. It can be easily cut with a milling cutter or the like after manufacturing the tripod shaft 3, which is a round shaft.

This notch 10.11 also indicates that when the universal joint transmits driving force, the tripod shaft 3 receives the load from the shafts 1 and 7.
(Fig. 5, parts 3A and 3B), it is desirable to provide the shafts in the axial direction of the shafts 1 and 7. This minimizes the decrease in the strength of the tripod shaft 3 during the transmission of driving force. can be kept in

When the roller 5 is mounted on the tripod shaft 3 by providing the notches 10.11 in the tripod shaft 3 in this way, the notches 1o and ii will form a gap between the cylindrical inner peripheral surface 6 of the roller 5 and the roller 5. 12.13 is formed, and this gap 12.13
Grease is injected into the tank and used as a grease reservoir.

As the universal joint is driven and the roller 5 slides around the axis of the tripod shaft 3 and in the axial direction, the grease in the grease reservoir 12.13 is applied to the entire outer peripheral surface of the tripod shaft 3 and the entire inner peripheral surface of the roller 5. It penetrates into the water and warms both parties, so there will be no oil slick.

In the above embodiment, both the notches 10 and 110 are formed, but it is sufficient to have either one of the notches, and the other notches are not necessarily planar. It is sufficient that a grease reservoir is provided between the outer circumferential portion of the tripod shaft and the inner curved surface of the roller by cutting out a portion of the outer peripheral portion of the tripod shaft that extends in the axial direction of the first shaft.

Additionally, although the above embodiment has been described with reference to a universal joint having the same shape as the conventional example shown in FIG. 2, the present invention can also be easily applied to a universal joint of the type shown in FIG. It is also possible to use them together.

As explained above, in the universal joint according to the present invention, a grease reservoir is provided between the outer peripheral part of the tripod shaft and the inner peripheral surface of the roller, so that the decrease in the strength of the tripod shaft is kept to a minimum, and the This has the excellent effect of improving the friction conditions of the rollers, reducing wear on the sliding surface, and improving durability.

The coefficient of friction and friction torque of the twisted arm surface are reduced and their fluctuations are reduced, which improves joint efficiency and reduces the amount of vibration generated.

[Brief explanation of the drawing]

Figures 1 to 3 are cross-sectional views showing conventional universal joints;
The figure is a sectional view showing the universal joint according to the present invention, and FIG.
FIG. 6 is a perspective view showing the tripod axis. 1...First shaft, 3...Tripod axis, 5...Roller, 6...Roller inner peripheral surface, I... Second axis, 8... Inner peripheral surface, 1
o, ii... Notch, 12, 13... Grease reservoir.

Claims (1)

[Scope of utility model registration request] The outer periphery of the rollers is supported by a second shaft having three tripod shafts fixed in a radial direction from the axis, and three rollers each having a spherical surface formed on the outer periphery and crowned by each tripod shaft. In a universal joint comprising a second shaft provided with three cylindrical surface grooves, a portion of the outer circumferential portion of the tripod shaft that extends in the axial direction of the first shaft is cut out from the outer end of the tripod shaft to form a tripod shaft. A universal joint characterized in that a gap is provided between the shaft and the inner circumferential surface of a roller that is crowned, and this gap is used as a grease reservoir.