JP2515886Y2 - Hook type fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a hook type joint used for a propeller shaft or the like of an automobile.

[Conventional technology]

As shown in FIG. 3, the hook type joint is composed of a pair of input side and output side yokes (2, 3) and one cross shaft (1) connecting these yokes, and the cross shaft (1) Each shaft portion (4) is connected to the yoke (2,
3) I am stuck in it.

The bearing structure adopted in the hook type joint was mainly the normal type shown in FIG. In this normal type bearing structure, the outer ring (6) of the needle roller bearing (5) and the shaft portion (4) of the cross shaft (1) can come into contact with each other at the annular contact surface (8). There is. Cross axis (1)
A grease hole (7) is axially formed in the shaft portion from the end face. Sufficient grease is filled in to prevent the roller (9) of the total roller type from falling down, and excess grease enters the grease hole (7) of the cross shaft (1) when assembled. This prevents grease leakage and reversal (turning) of the seal lip, and the grease that has entered the grease hole (7) flows out at any time to help lubrication.

In contrast to the normal type described above, the waffle type shown in FIG. 5 has recently been used.

[Problems to be solved by the device]

The waffle type is a normal type because the bottom part of the outer ring (6) and the shaft part (4) of the cross shaft (1) can contact with each other at the circular contact surface (8 ') at the center part of the end face of the shaft part (4). The grease hole (7) cannot be formed in the center of the end face of the shaft (4) as in the above. For this reason, if a large amount of grease is enclosed and installed in the bearing as in the normal type, grease may leak or the seal lip may be reversed (turned over).
Or cause. In order to prevent these problems, the waffle type reduces the grease filling amount. However, when the amount of grease is reduced, the roller (9) becomes unstable and tends to fall down. Further, since there is no grease hole, it is not possible to expect the action of accumulating and replenishing grease as needed unlike the normal type. In the case of a hook type joint, the bearing load is not a complete rotational movement but an oscillating movement.
Replenishing grease is essential.

Therefore, the object of the present invention is to prevent grease leakage and seal lip inversion in a waffle type hook type joint even if enough grease is filled to prevent the roller from falling down, and grease can be replenished. To do so.

[Means for solving the problem]

This invention consists of an input side yoke, an output side yoke, and a cross shaft that connects these, and a needle roller bearing is interposed between the shaft portion of the cross shaft and the yoke, and the outer ring bottom of the needle roller bearing and the cross shaft. In the structure in which the shaft portion of the cross-section can contact with the central portion of the end surface of the shaft portion, the problem is solved by providing the cross-shaped shaft portion with a radial hole located in the non-loaded range of the needle roller bearing. did.

[Action]

During assembly, the hook type joint of this invention has a large amount of grease adhered to the inner diameter surface of the outer ring of the needle roller bearing, and the shaft portion of the cross shaft is inserted into this to form a needle-shaped joint on the cross shaft. Assemble the roller bearing. At this time, excess grease is pushed to the inner side of the outer ring as the shaft is inserted,
When there is no place to go, it goes into the hole in the shaft through the gap between the rollers. Therefore, it is possible to prevent the grease from leaking out and inverting the seal lip. Further, the grease thus accumulated in the holes flows out at any time during use to perform a lubricating action.

[Embodiment] The hook type joint of the present invention is as described above with reference to FIG. 3 as far as basic components are concerned, but as shown in FIG. 1 and FIG. (3) is provided with a radial hole (17). This hole (17)
Need not necessarily be a through hole as shown in the drawing, but may be, for example, a blind blind hole that opens in the outer diameter surface of the shaft portion (14) in the radial direction.

The hole (17) is, as shown in FIG. 2, an unloaded zone, that is, a mechanical load on the cross axis (indicated by a two-dot chain line in FIG. 2)
It is provided in the area shifted by 90 ° in the circumferential direction. In the case of the bearing of the hook type joint, the load is not a complete rotary motion but an oscillating motion, and the direction in which the mechanical load is applied to the cross shaft is limited to the direction in which the cross shaft rotates. Therefore, even if the hole (17) is opened in the non-loaded area, the bearing function is not impaired.

Since the waffle type bearing structure comes into contact with the bottom of the outer ring at the center of the end face of the shaft portion of the cross shaft, the peripheral speed is lower than that of the normal type, which makes contact on the outer peripheral side, which is advantageous from the viewpoint of wear and the like. is there.

[Effect of device]

As described above, the present invention comprises the input side yoke, the output side yoke, and the cross shaft that connects them, and the needle roller bearing is interposed between the shaft portion of the cross shaft and the yoke. In the structure where the bottom of the outer ring and the shaft of the cross shaft can contact at the center of the end surface of the shaft, a radial hole is provided in the shaft of the cross shaft, so grease leakage and seal lip inversion may occur. It is possible to fill a sufficient amount of grease to prevent the rollers from falling, and thus it is also possible to replenish the grease. Moreover, since the radial hole formed in the shaft portion of the cross shaft is located in the non-loaded area of the needle roller bearing, there is no fear of impairing the bearing function.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, FIG. 3 is an exploded perspective view of a hook type joint, and FIGS. 2A and 2B are cross-sectional views of the bearing structure of the hook type joint, showing a normal type and a waffle type respectively. 2, 3: Yoke 11: Cross shaft 14: Shaft part 17: Hole 15: Needle roller bearing 16: Outer ring

Claims (1)

(57) [Scope of utility model registration request] 1. An input-side yoke, an output-side yoke, and a cross shaft that connects these yokes to each other. A needle roller bearing is interposed between the shaft portion of the cross shaft and the yoke, and the outer ring bottom of the needle roller bearing and the cross. In the structure in which the shaft portion of the shaft can contact with the central portion of the end surface of the shaft portion, the shaft portion of the cross shaft is provided with a radial hole located in the non-load zone of the needle roller bearing. Hook type joint.