JPH07121568B2 - Ceramic bearing and method for manufacturing the same - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a ceramic bearing having super wear resistance and excellent durability, and a method for manufacturing the same.

[Prior Art] Recently, ceramic bearings using ceramics as a bearing material have come to be used because they have super wear resistance, which is because ceramic flakes are regularly spaced on the inner peripheral surface of a metal shell. It is the one that is opened and arranged in parallel to the axial direction and bonded. However, ceramics have low impact resistance, and if the shaft edge is accidentally hit when the shaft is inserted into the ceramics bearing and the shock is received, the ceramics may be damaged. Is being developed.

An example of this will be described with reference to FIG. 4. The NBR rubber cylinder 12 is shrink-fitted inside the metal shell 11, and the rubber cylinder 1
The inner surface of 2 is shaved, and a ceramic strip 14 having a shorter length in the busbar direction than the metal shell 11 is adhered to the shaved portion with an epoxy resin 15. A resin 15 is arranged and fitted and fixed, and the fluorine resin ring 13 is used as a buffer guide.

[Problems to be solved by the invention] However, the ceramics provided with the above-mentioned buffer guide requires a long time for cutting the inner surface of the NBR rubber cylinder and processing of the fluorine resin, and polymerization of the epoxy resin, resulting in low productivity,
Especially, there is a problem that it is not possible to respond to an urgent request, and there has been a demand for improvement. An object of the present invention is to provide a ceramics bearing that solves the above problems.

[Means for Solving the Problems] Description will be made with reference to FIGS. 1 to 3. A ceramic bearing according to the present invention, which has solved the above-mentioned problems, has a cylindrical metal shell 1 having a thick portion 2a having the same length as the metal shell 1 and having inner gears at both ends of the inner circumference which are thicker than other portions. Forming a rubber tube 2 having a thin portion 3a of fluorine resin adhered to the thick portion 2a, and a ceramic strip 4 between the thick portions 2a, 2a.
Are arranged in the direction of the generatrix and closely adhered.

In addition, the method of manufacturing a ceramic bearing according to the present invention comprises a step of preparing split molds 5 and 5 in which raised portions 8 lower than the peak portions 6 are provided at both ends of a spline-shaped valley portion 7, and a foot on the raised portion 8 is provided. A step of temporarily fixing the base resin thin piece 3 and fitting and temporarily fixing the ceramic strip 4 to each valley 7 so as to be slightly higher than the base fluorine resin thin piece 3, and the ceramic strip 4 and the fluorine resin thin piece 3 The divided mold 5 that has been attached is inserted into the metal shell 1, the rubber 2 is filled, and heat vulcanization molding is performed, and the divided mold 5 is removed.

[Operation] Since the present invention is configured as described above, the necessary split molds 5 and 5 are manufactured in advance to manufacture the same, and the ceramic strip 4 and the fluorine resin thin piece 3 are set. By inserting the divided mold into the metal shell 1 and injecting the rubber 2 into the annular space formed by the metal shell 1 and the divided mold and vulcanizing, a ceramic bearing with a cushion guide is manufactured. With such a configuration, it is possible to manufacture in a short time, and it is possible to easily respond to an urgent production request.

[Embodiment] An embodiment of the present invention will be described with reference to FIGS. 1 to 3.

Reference numeral 1 is a cylindrical metal shell, 2 is a rubber tube such as silicone rubber formed in the metal shell 1, and has the same length as the metal shell 1 and is thicker than other portions in an inner gear shape at both inner peripheral ends. A portion 2a is provided.

Reference numeral 3 is a foamed or non-foamed fluororesin thin piece that is in close contact with the thick portion 2a, and 4 is a ceramic strip arranged between the thick portions 2a, 2a side by side in the generatrix direction.

Further, in manufacturing the ceramic bearing, split molds 5 and 5 in which ridges 8 lower than the peaks 6 are provided at both ends of the spline type valleys 7 in advance are prepared. When the resin thin piece 3 is temporarily fixed, the ceramic strip 4 is fitted in each trough 7 so as to be slightly higher than the fluorine resin thin piece 3, and temporarily fixed, and the ceramic strip 4 and the fluorine resin thin piece 3 are attached. The divided mold 5 is inserted into the metal shell 1, the rubber 2 is filled therein, the mixture is heated and vulcanized and molded, and then the divided mold 5 is taken out and manufactured.

If silicone rubber is used for the rubber tube, the heat resistance of the bearing material will be improved and the ceramic strip 4 will not be pushed and broken by the rubber tube 2 during rubber injection vulcanization. In this case, it is preferable to select a silicone rubber having a viscosity as low as possible. After the vulcanization / molding, it is only necessary to process the fluorocarbon resin 3, and the time required for injecting and vulcanizing the rubber is significantly shorter than the time required for the polymerization of the epoxy resin.

EFFECTS OF THE INVENTION Since the present invention is configured as described above, the manufacturing time is significantly shortened, and it is possible to easily meet the demand for urgent production.

[Brief description of drawings]

FIG. 1 is a perspective view of a ceramics bearing according to an embodiment of the present invention,
FIG. 2 is a cross-sectional view of the ceramic bearing in the generatrix direction, and FIG. 3 is a vertical cross-sectional side view of the split mold, with the upper half showing the peaks and the lower half showing the troughs. FIG. 4 is a view corresponding to FIG. 2 of the conventional example. 1 …… Metal shell 2 …… Rubber cylinder 2a …… Thickened part 3 …… Fluorocarbon resin strip 4 …… Ceramic strip 5 …… Dividing mold 6 …… Mountain part 7 …… Valley part 8 …… Rising part 11 …… Metal shell 12 …… NBR rubber tube 13 …… Fluorocarbon resin ring 14 …… Ceramic strip 15 …… Epoxy resin

Claims (3)

[Claims] 1. A rubber having a thick portion (2a) in the cylindrical metal shell (1), which has the same length as the metal shell (1) and which is thicker than other portions in the shape of an internal gear at both ends of the inner circumference. A cylinder (2) is formed, a thin piece (3) of fluororesin is closely attached to the thick portion (2a), and a ceramic strip (4) is arranged between the thick portions (2a, 2a) in the generatrix direction. Ceramic bearings characterized by close contact. 2. A split mold (5, 5) in which a valley (7) of a spline type is provided with ridges (8) lower than the peaks (6) at both ends.
In the step of preparing, the fluorine resin thin piece (3) is temporarily fixed on the raised portion (8), and the ceramic strip (4) is slightly higher than the fluorine resin thin piece (3) in each valley (7). ) Is inserted and temporarily fixed, the ceramic mold strip (4) and the fluorine resin thin piece (3) are attached, the split mold (5) is inserted into the metal shell (1), and the rubber (2) is attached. A method of manufacturing a ceramic bearing, which comprises a step of filling and hot vulcanization molding, and a step of removing the split mold (5). 3. The method for manufacturing a ceramic bearing according to claim 2, wherein the rubber (2) to be filled is silicone rubber.