JPS6091027A - Bearing device of universal coupling - Google Patents

Abstract

PURPOSE:To keep the prescribed precision of the device for a long period, by fixing a wound bush, on whose back metal's inner surface, a thin synthetic resin layer is formed, into a cylindric concavity of a cap which is fixed in a hole for a bearing device, of a yoke. CONSTITUTION:A bearing device 10 is formed of a cap 11 and a wound bush 12. In the central 1 side of the cap 11, a cylindric concavity 11a is formed, and in another side of the cap 11, in the closed part, a stepped projection 11b is formed. On the inner surface of a back metal 12a of the wound bush 12, a low friction synthetic resin layer 12c, which is 0.1-0.5mm. in thickness, is formed, and the joint part c slightly opens, inevitably. Then, in the situation that a cylindric shaft 9a of a trunnion 9 is set in a hole 7 of a yoke 2, 3, an O-ring 15 is set between a step part 9b of the trunnion 9 and the back metal 12a, and the bearing device 10 is inserted into the hole 7.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a universal joint, particularly a universal joint used in a steering section of an automobile, and more particularly to a bearing device between a trunnion and a yoke in a universal joint generally called a cardan type. .

Conventionally, needle bearings have been used in bearing devices for this type of universal joint, and for this reason, the surface hardness of the trunnion,
It is necessary to strictly control the roughness and dimensions, which, together with the high price of the needle bearing itself and the trouble of assembly, causes an increase in costs.

Therefore, the present applicant proposed a universal shaft joint using a synthetic resin bearing (see Utility Model Application Publication No. 116824/1982), but the bearing device of the universal shaft joint is made of synthetic resin such as Delrin (trade name). Since it is constructed by fitting a resin bearing into a cap, a synthetic resin bearing with a predetermined wall thickness is required, and when the resin bearing is press-fitted into the cap, permanent deformation tends to occur in the bearing. Coupled with the fact that the dimensional accuracy of the manufactured bearing is not perfect enough to provide the desired clearance (0.03 to 0.10 mm) between it and the trunnion, the reliability of the bearing is insufficient, and furthermore, the characteristics of the synthetic resin Due to a certain low thermal conductivity, heat dissipation from the bearing part is insufficient (1), and if it breaks, there is a risk that it will lack reliability as a universal joint for an automobile steering part, which could lead to a serious accident.

Furthermore, a bearing device for a universal joint has been devised in which the trunnion has a tapered surface and a synthetic resin bearing with a tapered inner surface that slides in sliding contact with the tapered surface is installed with an appropriate preload. Publication No. 56-22029 and Utility Model Publication No. 5
[Refer to Publication i-163820). However, since the sliding bearing has a tapered inner surface, its molding is extremely troublesome, resulting in even lower accuracy than the aforementioned cylindrical resin bearing, and This may cause undesirable writhing movements and vibrations on the unit.

The present invention has been made in view of the above-mentioned circumstances, and provides a highly reliable swivel shaft that can be easily and inexpensively manufactured, maintains a predetermined accuracy over a long period of time, and eliminates the above-mentioned drawbacks. The purpose is to provide a joint.

A feature of the present invention is that a wound bushing made of a thin synthetic resin layer formed on the inner surface of a metal backing is fitted into the cylindrical recess of the cap, and the cap is fixed in the hole for the bearing device of the yoke. In addition, there is provided a bearing device for a universal shaft joint constructed by slidingly contacting a synthetic resin layer of a wound bushing with a trunnion of a spider.

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

As shown in FIG. 1, the universal joint 1 consists of a yoke 2 connected to a drive shaft, a yoke 3 connected to a wave shaft, and a cross-shaped spider 5. Furthermore, each yoke 2
, 3 are each provided with a hole 7 for a bearing device, and each trunnion 9 of the spider 5 is fitted into these holes 7 with a bearing device 10 according to the present invention interposed therebetween. There is.

As shown in FIGS. 2, 4, and 5, the bearing device 10 consists of a cap 11 and a winding bush 12, and the cap 1" has a cylindrical recess 11a formed in its center 1 side. At the same time, a stepped protrusion 11b is formed on the other side closing portion. Further, the winding bush 12 is formed by forming a low friction synthetic resin layer 12c in a range of 0.01 to 0.5 on the inner surface of a back metal 12a, and inevitably has a small gap at the joint portion C thereof. Further, when the winding block 12 is enlarged, as shown in FIG. Alternatively, it is constructed by impregnating and integrating 72 layers 12c with a polyacetal resin as a main ingredient, a lubricant such as lead or lubricating oil, and a reinforcing synthetic resin such as polyphenylsulfide.

As shown in FIG. 7, the bearing device 10 is constructed by press-fitting the wound bushing 12 into the cylindrical recess 11a of the cap 11. At this time, the synthetic resin layer 12c of the wound bushing 12 is completely C Because it is thin (0.2~0.3Inf
f+), its thickness accuracy can be precisely defined, permanent deformation will not occur, and the seam C has a predetermined elasticity. Depending on the vanilla or l1lF machining process, the cylindrical four parts 11n are tightly formed to ensure accurate dimensional accuracy, and the winding bushing 12 is shaped by its spring action. , Taper 11 of cap 11. In combination with c, it can be press-fitted into the recess 11a of the cap extremely easily, and the seam C (
When fitted to the cap 11, it is closed and continuous, and the winding sleeve 12 is inserted into the recess 1 of the cap 11 without any equivalent fixing means. is held securely within la.

Furthermore, as shown in FIGS. 1, 2, and 3, with the cylindrical shaft portion 9a of the trunnion 9 positioned within the hole 7 of the yokes 2 and 3, the O-ring 15 is inserted into the stepped portion 9b of the trunnion 9. The bearing device 1° is inserted into the hole 7, interposed between the two. At this time, a clearance of 0.03 to 0.10 mm is provided between the trunnion shaft portion 9a and the surface of the wound bushing resin layer 12c, and a small amount of grease is applied to the inner surface of the wound bushing 12 in advance. In this state, the caulking pawls 16 formed around the holes 7 of the yokes 2 and 3 are bent and abut against the stepped protrusion 11b of the cap 11, thereby preventing the bearing device 1o from coming off. Then, the universal joint 1 is assembled. In the above-mentioned embodiment, the pawl J6 was formed around the hole 7 of the yoke 2°3, but the pawl 16 was not formed, and after the bearing device 1o was press-fitted into the hole 7, the area around the hole 7 was crimped with l. You can also prevent it from coming out by riveting it.

Since the present embodiment has the above-described configuration, relative sliding movement occurs between the synthetic resin layer 12C of the bearing device 10 and the trunnion shaft portion 9a due to the use of the universal joint 1.
The resin layer surface portion 120' is scraped off at the initial wear stage during the break-in operation, and the scraped portion adheres to the shaft portion 9a and is supplied to the joint C portion of the winding bushing 12, so that the resin layer 12c is completely continuous. . As the use progresses, the bronze sintered porous layer 12b begins to be exposed, and the lubricant impregnated in the resin layer 12c is gradually replenished, completely separating the shaft portion 9a and the bearing metal surface even without lubrication.・A predetermined bearing performance can be maintained over a long period of time by coating, and the layer between the shaft portion 9a and the bearing metal surface, together with the spring action of the winding cover J2, allows for flexible The impact load acting on the joint 1 can be dispersed and absorbed. Furthermore, a synthetic resin layer 12
Since c is extremely thin and impregnated with the bronze sintered porous layer, heat dissipates well and the temperature of the bearing device 10 portion does not rise.

As explained above, according to the present invention, the bearing device 10 is configured such that the wound bushing 12 formed by forming the thin synthetic resin layer 12C on the inner surface of the back metal 12a is attached to the cylindrical recess 11a of the cap 1.
Since the synthetic resin layer 12c is configured to be fitted into the cap 11, it is sufficient that the synthetic resin layer 12c is extremely thin. Therefore, in conjunction with the spring action based on the wound bushing 12, it is possible to ensure accurate dimensional accuracy and prevent permanent deformation when press-fitting into the cap 11. It is possible to improve the bearing accuracy by providing a desired clearance with the trunnion shaft portion 9a without causing any problems, and because it does not require lubrication, the bearing accuracy can be maintained for a long period of time. Furthermore, it is possible to disperse and absorb impact loads, as well as to dissipate heat well, and by combining the above effects, it is possible to obtain a highly reliable universal joint 1.

Further, the wound bushing 12 has a predetermined elasticity due to the joint C, and based on this elasticity, the bushing 12 can be easily fitted into the cylindrical recess 11a of the cap 11, and the fitted state can be reliably maintained. In addition to the improved dimensional accuracy, the assembly of the universal joint 1 can be greatly facilitated. Furthermore, since the bearing surface of the bearing device 1O is cylindrical and its dimensional accuracy is accurate, there is no possibility of contact between the bearing device 10 and the trunnion 9, and the trunnion 9 is free from shearing motion and vibration. It is possible to reliably prevent the occurrence of movement (as desired).

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the universal joint according to the present invention, FIG. Fig. 5 is a perspective view showing the cap, Fig. 5 is a perspective view showing the winding bushing, Fig. 6 is a perspective view showing the cap.
The figure is an enlarged cross-sectional view of the winding bush, and FIG. 7 is a cross-sectional view showing the bearing device. 1. Universal joint, 2, 3... Yoke, 5 Spider, 7 Bearing device hole, 9... Trunnion, 10. Bearing device, 11... Cap, 1
Volume 2 Bush, 12a Backing metal, 12c...Synthetic resin layer Figure 1 Procedural amendment (method) February 2, 1980 1 Date of case 1982 Patent application No. 200582 2 Name of invention flexible shaft Joint bearing device 3 Relationship with old case to be amended Patent applicant address I!\!Pg prefecture aXM Ichijima 1?1fff89 (
l 1Jfi Name: Kyowa Sangyo Co., Ltd. Representative Precious Wood Somen 4 Agent (Shipped on January 31, 1980)

Claims (1)

[Claims] (11) In a universal shaft joint that has drive-side and wave-side yokes and a cross-shaped spider, and further has a bearing device interposed between the hole for the bearing device in the yoke and the trunnion of the stopper and rider, the cap A winding bushing with a thin synthetic resin layer formed on the inner surface of the backing metal is fitted into the cylindrical recess of the metal backing, and the cap is fixed in the hole for the bearing device of the yoke, and the synthetic resin layer of the winding bushing is slid onto the spider's trunnion. A bearing device with a universal joint that is in contact with the other.