JPH078634U - Bearing device for universal joint - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] In particular, the needle bearing is sufficiently lubricated, and the washer does not rotate with the bearing cap. In a universal joint that connects a pair of yokes 1 and 2 by a cross-shaped spider 13 having a cap-type bearing mounted at its ends, between the end surface of each arm 13a of the cross-shaped spider 13 and the cap inner bottom 12a of the bearing 11. A washer 15 provided with a waffle 14 that is in contact with the inner bottom 12a, and each arm 13a of the washer 15 and the spider 13
A groove 13c or 15'a that also serves as an oil groove is formed on either one of the end faces, and a ridge 15a that fits into the groove 13c on the other side.
Alternatively, 13'e may be formed and grease or the like may be supplied to the needle bearing 11 through the concave groove 13c or 15'a and filled near the inner bottom 12a of the bearing cap 12.
And it can also be supplied to the mesh in the waffle 14, therefore
The frictional force between the waffle 14 and the inner bottom 12a of the bearing cap can be further reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a universal joint bearing device used for a propulsion shaft of an automobile or the like.

[0002]

[Prior art]

 As shown in FIG. 6, a universal joint composed of a pair of yokes 1 and 2 provided at the ends of the shaft and a cross-shaped spider 3 that connects the yokes 1 and 2 is used for a propulsion shaft of an automobile or the like. Many joints are used. As shown in Japanese Utility Model Laid-Open No. 56-97630, cap-type bearings are fitted to the ends of a pair of bifurcated yokes, and the ends of the cruciform spider are attached to the cap-type bearings via needle bearings. It is designed to support and to connect a pair of yokes.

In this case, the yoke rotates in accordance with the rotation of the propulsion shaft, and the cross-shaped spider slides, so that each arm end surface of the cross-shaped spider and the bearing cap of the cap-type bearing facing the end surface of the arm. Since it comes into contact with the bottom, it is necessary to reduce the frictional force at that time. As a means for reducing the frictional force, for example, as shown in FIG. 7, the center portion of the inner bottom 5a of the bearing cap 5 fitted through the needle bearing 4 to the end portion of the arm 3a of the cross spider 3. Then, a protrusion 6 called a waffle is formed. The protrusion (hereinafter referred to as a waffle) has a fine mesh 6a formed on the end face 3b side of the arm 3a by means of a knurl or the like so that grease or the like can be held. Further, the waffle 6 has a minimum diameter so that the frictional force between the mesh 6a and the end face 3b of the arm 3a becomes small. For the same purpose, for example, as disclosed in Japanese Utility Model Laid-Open No. 56-97629, a thrust washer having the same diameter as that of the end face is used between the inner bottom of the bearing cap and the end face of the spider. It is known that an oil groove is formed on the sliding surface of the oil passage leading to the oil hole of the spider.

[0004]

However, in the structure shown in FIG. 7, although the waffle 6 has a small diameter and the frictional force between the end face 3b of the arm 3a can be reduced, the oil groove is formed on the bearing cap inner bottom 5a side. Cannot be formed, and in particular, there is a risk that the needle bearing 4 will be insufficiently lubricated. Further, the one described in Japanese Utility Model Laid-Open No. 56-97629 has a large frictional force due to the large diameter of the thrust washer even if the needle bearing can be sufficiently lubricated, and the grease in the thrust washer is large. There is a risk that the frictional force on the hard-to-reach surface such as the bearing cap inner bottom 5a side will increase, causing the washer to loosely rotate with the bearing cap and generate a frictional force with the end surface of the spider. is there. In view of the above, it is an object of the present invention to provide a bearing device for a universal joint in which the needle bearing is sufficiently lubricated and the washer does not rotate with the bearing cap.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the bearing device for a universal joint according to the present invention is a universal joint in which a pair of yokes are connected by a cruciform spider having a cap-type bearing mounted on the ends thereof. A washer equipped with a waffle that contacts the inner bottom is interposed between the inner bottoms of the bearing caps, and a groove that doubles as an oil groove is provided on either one of the washer and the end surface of each arm of the spider. Another feature is that a ridge portion that fits in the groove is formed.

[0006]

[Work]

 For example, the protrusion 15a of the washer 15 is fitted in the groove 13c formed in the cross spider 13, and the washer 15 is combined with the end surface 13b of the cross spider 13, and the bearing cap 12 is attached to the washer 15. If the waffle 14 is fitted to the arm 13a of the cross spider 13 and the waffle 14 is in contact with the inner bottom 12a of the bearing cap 12, grease can be supplied from the oil hole 13d described later of the cross spider 13. The grease is supplied to the needle bearing 11 through the concave groove 13c below the protruding portion 15a of the washer 15 and is filled in the vicinity of the inner bottom 12a of the bearing cap 12 so that the mesh 14a of the waffle 14 will be described later. Is also supplied. Therefore, the frictional force between the waffle 14 and the inner bottom 12a of the bearing cap 12 can be further reduced. Further, since the washer 15 and the arm 13a of the cross spider 13 are integrated, the washer 15 always rotates together with the cross spider 13 and is caught by the bearing cap 12 so that the cross spider 13 and No large frictional force is generated between them.

[0007]

【Example】

 The bearing device according to the present invention will be described in detail with reference to FIGS. 1 to 4. The bearing device according to the present invention includes: an end surface 13b of an arm 13a of a cross-shaped spider 13 on which a bearing cap 12 is fitted via a needle bearing 11; A fine mesh 14a is provided between the inner bottoms 12a of 12 and a washer 15 having a small diameter waffle 14 which is in contact with the inner bottom 12a of the bearing cap 12 is interposed. On each arm end surface 13b of the da 13, a concave groove 13c also serving as an oil groove is formed in a cross shape and communicates with an oil hole 13d formed in the shaft center of the arm 13a, and the washer 15 has a waffle 14 On the opposite side, a ridge 15a is formed which fits into the groove 13c.

The washer 15 including the waffle 14 is made of an oil resistant resin, and the waffle 14 and the washer 15 are integrally formed. Further, the height of the ridge 15a is set lower than the depth of the groove 13c, so that the ridge 15a of the washer 15 is inserted into the groove 13c of the cross-shaped spider 13 as shown in FIGS. When the washer 15 is fitted to the end surface 13b of the cross-shaped spider 13, the lubricating oil G such as grease can be stored below the protruding portion 15a of the washer 15.

As described above, the protrusion 15a of the washer 15 is fitted into the concave groove 13c of the cross spider 13, and the washer 15 is combined with the end surface 13b of the cross spider 13, and then, as shown in FIG. As shown in FIG. 5, the bearing cap 12 is fitted to the washer 15 and the arm 13a of the cross spider 13 via the needle bearing 11 so that the mesh 14a of the waffle 14 contacts the inner bottom 12a of the bearing cap 12. When the grease G is supplied from the oil hole 13d of the cross spider 13 in this state, the grease G is supplied to the needle bearing 11 through the concave groove 13c below the protrusion 15a of the washer 15 and It is filled near the inner bottom 12 a of the bearing cap 12 and is also supplied to the mesh 14 a of the waffle 14. Therefore, the frictional force between the waffle 14 and the inner bottom 12a of the bearing cap 12 can be further reduced.

Further, since the washer 15 is integrated with the arm 13a of the cross spider 13 by the protrusion 15a through the groove 13c, the washer 15 always rotates together with the cross spider 13, As in the thrust washer in Japanese Utility Model Laid-Open No. 56-97629, it is not entrained by the bearing cap and does not generate a large frictional force with the cross spider 13.

In contrast to the embodiment shown in FIGS. 1 to 4, the embodiment shown in FIG. 5 has a groove 15'a also serving as an oil groove on the side of the washer 15 'with the waffle 14' and a cross shape. The spider 13 'has a ridge 13'e formed on the end surface 13'b, and has the same effect as that of the embodiment shown in FIGS.

[0012]

[Effect of device]

 The bearing device for a universal joint of the present invention is a universal joint in which a pair of yokes are connected by a cruciform spider having a cap-type bearing mounted on the ends thereof, wherein the end surface of each arm of the cruciform spider and the cap of the bearing are A washer having a waffle in contact with the inner bottom is interposed between the bottoms, and a groove that also serves as an oil groove is provided on one of the washer and each end surface of each arm of the spider, and on the other side, a groove is formed. Since it is characterized in that the fitting ridge is formed, grease and the like can be supplied to the needle bearing through the concave groove, and it can be filled near the inner bottom of the bearing cap, and also in the mesh of the waffle. Therefore, the frictional force between the waffle and the inner bottom of the bearing cap can be further reduced. Further, since the washer is integrated with the cross-shaped spider, the washer inevitably rotates together with the cross-shaped spider and is entrained by the bearing cap to generate a large frictional force with the cross-shaped spider. Absent.

[Brief description of drawings]

FIG. 1 is an assembled sectional view of an embodiment of a bearing device for a universal joint according to the present invention.

FIG. 2 is an exploded perspective view of essential parts of an embodiment of a universal joint bearing device according to the present invention.

FIG. 3 is an end view of a cruciform spider of an embodiment of a bearing device for a universal joint according to the present invention.

FIG. 4 is a perspective view of a main assembly of an embodiment of a bearing device for a universal joint according to the present invention.

FIG. 5 is an exploded perspective view of essential parts of another embodiment of the universal joint bearing device according to the present invention.

FIG. 6 is a perspective view of a universal joint in which the bearing device for a universal joint of the present invention is used.

FIG. 7 is an assembled cross-sectional view of a conventional universal joint bearing device 1, 2; Yoke 3, 13; Cross-shaped spider 13a; Arm 13b; End face 13c, 15'a; Recessed groove 13d; Oil holes 4, 11; Needle. Bearing 5, 12; Bearing cap 6, 14, 14 '; Waffle (projection) 15, 15'; Washer 15a, 13'e;

Claims (1)

[Scope of utility model registration request] 1. A universal joint for connecting a pair of yokes by means of a cross-shaped spider having a cap-type bearing mounted on an end portion thereof, wherein an inner surface of each of the arms of the cross-shaped spider and an inner bottom of the cap of the bearing are connected to each other. A washer having a waffle in contact with the bottom is interposed, and a groove that doubles as an oil groove is provided on either one of the washer and the end surface of each arm of the spider, and the other is a protrusion that fits into the groove. A bearing device for a universal joint, characterized in that