CZ24436U1 - Bearing provided with fluoroplastic lining - Google Patents

Description

Bearing with fluoroplastic liner

Technical field

The proposed solution falls within the area of bearings for rotating parts, namely between spherical and sliding bearings, and furthermore relates to their lining based on fluoroplastics, most often represented by polytetrafluoroethylene (hereinafter PTFE).

BACKGROUND OF THE INVENTION

Spherical plain bearings are composed of an inner and an outer ring having a spherical functional surface. The bearings are mainly used where high loads are applied at low peripheral speeds. They can perform slow movements, compensate for misalignment, and perform rocking movements. Spherical plain bearings are produced in a combination of different types of sliding surfaces: steel to steel to be lubricated, or a combination of steel with sintered bronze, a combination of steel with PTFE with a fabric or a PTFE composition that does not need to be relubricated. As for the sliding surfaces, it is similar in the case of articulated heads and sliding bearings - cylindrical bushings.

Due to the inferior mechanical properties of PTFE, the linings on this basis are most often reinforced with a bronze fabric. Another possibility is to use a mixture of PTFE and lead and roll it into porous tin bronze or to use a composite material comprising PTFE and a glass fiber fabric in an epoxy or phenolic resin.

The essence of the technical solution

The essence of the proposed technical solution is the material composition of the lining, which is made in the form of foil and which is glued or otherwise attached to the inner surface of the outer ring of the spherical bearing. The lining is made of a sintered mixture of PTFE powder and bronze powder. The composition comprises 20% to 80% by weight of the composition. bronze. In order to achieve certain physical properties, this mixture may optionally be supplemented with an additive in an amount of about 10% to 20% by weight. These additives may in particular be molybdenum simic or ceramic powder. Lining made of this material is resistant to abrasion, withstands heavy loads. PTFE provides self-lubricating lining capability at very low coefficient of friction, bronze provides shape stability, rigidity and prevents rapid wear under heavy loads. At the same time, this lining is resistant to aggressive chemical environments, absorbs vibrations and withstands shock loads.

BRIEF DESCRIPTION OF THE DRAWINGS

An exemplary embodiment of the proposed solution is described with reference to the drawing, in which Fig. 1 is an overview of spherical plain bearings with a fluoroplastic liner.

Example of technical solution

According to the proposed technical solution, the fluoroplastic liner, even in the form of a foil of 0.3 mm thickness, is adhered to the inner spherical surface of the outer ring of the radial spherical plain bearing 2. This liner is made by sintering a mixture of 20 µm PTFE and bronze powder of 32 pm. The bronze content of the mixture in this case is 40% by weight. The composition further comprises 5 wt. admixtures consisting of molybdenum disulfide. Said radial spherical plain bearing 2 has an inner diameter of 30 mm, an outer diameter of 47 mm, an inner ring width of 22 mm, an outer ring width of 18 mm. The described embodiment is the fifth of FIG. 1.

Claims (4)

PROTECTION REQUIREMENTS A liner with a foil-lining made of a fluoroplastic material, characterized in that the lining (1) is made of a sintered mixture consisting of PTFE powder and bronze powder, the mixture comprising 20 to 80 wt. bronze. 5 A liner with a plastics liner according to claim 1, characterized in that the mixture constituting the liner (1) comprises 10 to 20 wt. impurities consisting of MoS ₂ - and / or ceramic powder of less than 30 µm particle size. Bearing with a fluoroplastic liner according to claims 1 and 2, characterized in that it is self-lubricating and therefore maintenance-free. O 4. A bearing with a plastics liner according to claims 1, 2 and 3, characterized in that it comprises a spherical plain bearing radial (2), axial (3) and angular contact (4) including hinged heads, a plain bearing radial (5) and axial (6). ).