CN1296633C - Self-compensation lubricating sliding bearing - Google Patents

Abstract

The invention relates to a self-compensating lubricating sliding bearing, which comprises a bearing seat (1) and a bearing bush (5), the bearing seat (1) is set on the bearing bush (5), the bearing seat (1) and the bearing bush (5 ) is provided with a porous wear-resistant sintered sleeve (2), the sleeve wall of the porous wear-resistant sintered sleeve (2) is provided with an oil storage tank, and the oil storage tank is filled with high-temperature lubricating grease (3). Since the porous wear-resistant sintered sleeve is arranged between the bearing seat and the bearing bush of the bearing of the present invention, an oil storage tank is opened on the wall of the porous wear-resistant sintered sleeve, and the oil storage tank is filled with high-temperature lubricating grease. After the grease is diluted, it passes through the micropore lubrication friction interface in the porous wear-resistant sintered sleeve, so that the bearing not only has a very low friction coefficient and a high PV value; but also solves the self-compensation problem of bearing lubrication and improves the service life of the bearing, so , the bearing is especially suitable for working conditions that require long-term continuous operation, high ambient temperature and difficult maintenance.

Description

Self-compensating lubricated plain bearings

technical field

The invention relates to bearings, especially self-lubricating plain bearings.

Background technique

Powder metallurgy oil-impregnated bearings impregnate lubricating oil in the sintered body during its preparation process. When in use, the bearing can realize self-lubrication under the action of frictional heat, but this kind of bearing cannot realize self-compensation of lubricating oil. After volatilization and exhaustion under the action of heat, the bearing will fail rapidly. In order to realize the compensation of lubricating oil, there are mainly two existing methods: (1) drilling holes in the shaft sleeve and adopting an external oil supply system; (2) setting up an oil storage tank in the bearing housing, and placing oil felt to gradually immerse it into the lubricating oil. compensation in the bearing. The former requires a special device, which is difficult to achieve for some difficult supports, and is not suitable for high-altitude operations; although the latter has wide applicability, because the immersion of oil in the felt is based on the principle of capillary suction, the oil in the felt is used It is a liquid oil, and its operating temperature is limited. With the development of engineering technology, the compensation methods of these two lubricating oils can no longer meet the requirements for the use of bearings in some occasions, such as: they cannot meet the requirements for the roller bearings of the feeding conveyor used in the smelting process. During the smelting process, the roller bearings of the feeding conveyor bear high loads, have a certain ambient temperature, work in dusty and harsh environments, and are mostly transported over long distances and at high altitudes. The maintenance of the lubricating oil compensation of the bearing is very difficult and has potential safety hazards. If the maintenance of the lubrication compensation is not realized, the bearing is prone to early failure; the failed bearing restricts the free rotation of the idler roller and makes the belt and the surface of the idler roller opposite each other. Sliding; this not only accelerates the wear of the idler rollers, but also increases the movement resistance between the conveyor belt and the idler rollers, making the rotation noise of the conveyor larger and the conveyor belt easily damaged.

Contents of the invention

The technical problem to be solved by the present invention is to provide a self-compensating lubricating sliding bearing which can automatically compensate lubricating oil for the bearing.

The technical solution adopted by the present invention to solve the problems of the technologies described above is:

It includes a bearing seat and a bearing bush, the bearing seat is set on the bearing bush, a porous wear-resistant sintered sleeve is arranged between the bearing seat and the bearing bush, and an oil storage tank is opened on the wall of the porous wear-resistant sintered sleeve. Filled with high temperature grease.

The porous wear-resistant sintered sleeve is installed in the bearing seat with tight fit, and the bearing bush is installed in the porous wear-resistant sintered sleeve with dynamic fit; the oil storage tank is opened on the outer wall of the porous wear-resistant sintered sleeve.

Its two ends are provided with thrust positions respectively, and the thrust positions at both ends are respectively set on the end faces of the bearing housing and the bearing bush; Grinding gasket.

The porous wear-resistant sintered sleeve and the wear-resistant gasket are sintered bodies of Fe-Ni-Cu based powder metallurgy materials. The sintered body is mixed with Fe, Ni, Cu, pore-forming agent and solid lubricant, and is formed by cold mold pressing at 1020 It is sintered under vacuum at -1120°C; the weight percentage ratio of the above components is:

Fe 50-70%, Ni 20-30%, Cu 5-10%, pore forming agent 2-8%, and the balance is solid lubricant.

The porosity of the sintered body is 15-30%.

The titer of the high-temperature grease is higher than the service temperature of the lubricating oil impregnated during the preparation of the sintered body.

Since the porous wear-resistant sintered sleeve is arranged between the bearing seat and the bearing bush of the bearing of the present invention, an oil storage tank is opened on the wall of the porous wear-resistant sintered sleeve, and the oil storage tank is filled with high-temperature lubricating grease. After the grease is diluted, it passes through the micropores in the porous wear-resistant sintered sleeve to lubricate the friction interface, so that the bearing not only has a very low friction coefficient (f≤0.10) and a high PV (load x speed) value (≥6.5MPa m/s ); and it solves the self-compensation problem of bearing lubrication and improves the service life of the bearing. Therefore, the bearing is especially suitable for working conditions that require long-term continuous operation, have high ambient temperature and are difficult to achieve oil maintenance.

The main difference between the present invention and the existing powder metallurgy oil-impregnated bearing is:

The way to realize self-lubrication in the present invention is: the frictional heat provides the driving force for realizing the self-compensation of interface lubrication while volatilizing the interface lubricating oil; through the heat conduction of the sintered body, the internal lubricating grease is melted and passed through the micropores in the sintered body Diffusion to the friction interface to achieve self-lubricating and self-compensating functions.

Description of drawings

Fig. 1 is the structural sectional view of the embodiment of the present invention

Detailed ways

As shown in Figure 1, the embodiment of the present invention includes a bearing seat 1 and a bearing bush 5, the bearing seat 1 is set on the bearing bush 5, and a porous wear-resistant sintered sleeve is arranged between the bearing seat 1 and the bearing bush 5 2. The porous wear-resistant sintered sleeve 2 is installed in the bearing seat 1 with a tight fit, and the bearing bush 5 is installed in the porous wear-resistant sintered sleeve 2 with a dynamic fit; the outer wall of the porous wear-resistant sintered sleeve 2 is provided with an oil storage tank. The oil groove is filled with high-temperature grease 3 . The two ends of the bearing are provided with thrust positions 6 and 7 respectively, and the thrust positions 6 and 7 at both ends are respectively arranged on the end surfaces of the bearing seat 1 and the bearing bush 5 . A wear-resistant gasket 4 is provided between the end surface of the porous wear-resistant inner sleeve 2 and the thrust position 7 of the end surface of the bearing bush 5, and differential sliding can occur between the wear-resistant gasket 4 and the end surface of the porous wear-resistant inner sleeve 2, so that The relative sliding of the end faces of the bearing sleeve and the bearing bush can improve the service life of the bearing while satisfying the axial thrust of the bearing.

The bearing bush 5 is made of GCr15 material through heat treatment. Bearing seat 1 is prepared by heat treatment of 45# steel. The porous wear-resistant sintered sleeve 2 and the wear-resistant gasket 4 are sintered bodies of Fe-Ni-Cu based powder metallurgy materials. MoS ₂ ) mixed, formed by cold molding and sintered under vacuum at 1020-1150°C; the weight percentage ratio of the above components is: Fe 50-70%, Ni 20-30%, Cu 5-10 %, pore-forming agent 2-8%, and the balance is solid lubricant; the porosity of the sintered body is 15-30%.

The invention can increase the operating temperature and sliding speed range of the bearing by increasing the titer of the lubricating grease, so as to meet the requirements of different working conditions on the operating temperature of the bearing. The titer of the high-temperature lubricating grease 3 in the embodiment of the present invention is higher than the service temperature of the lubricating oil that the sintered body is impregnated in the preparation process.

Since the self-lubricating material in the inner sleeve of the bearing has a certain content of Ni-Cu material, when the bearing is working, the Ni-Cu element, which is superior to the thermal conductivity of Fe, increases the conductivity of the sintered body, making the friction generated by the friction interface The heat is easily transferred to the outer surface; and the grease lubricating oil on the surface of the bearing sleeve is melted; the lubricating oil diffuses to the friction surface through the micropores in the sintered body under the action of the thermal gradient; during the preparation process, the micropores in the sintered body of the bearing sleeve are formed by The pore former controls, therefore, the Ni-Cu composition and porosity in the sintered body of the bearing controls the lubrication self-compensation rate of the bearing during the friction process.

Claims (6)

1. A self-compensating lubricating sliding bearing, which includes a bearing seat (1) and a bearing bush (5), the bearing seat (1) is set on the bearing bush (5), and it is characterized in that: A porous wear-resistant sintered sleeve (2) is arranged between the sleeves (5), and an oil storage tank is opened on the sleeve wall of the porous wear-resistant sintered sleeve (2), and the oil storage tank is filled with high-temperature lubricating grease (3). 2. The self-compensating lubricating sliding bearing according to claim 1, characterized in that: the porous wear-resistant sintered sleeve (2) is installed in the bearing housing (1) with a tight fit, and the bearing bush (5) is installed in the bearing seat (1) with a dynamic fit. Inside the porous wear-resistant sintered sleeve (2); the oil storage tank is opened on the outer wall of the porous wear-resistant sintered sleeve (2). 3. The self-compensating lubricating sliding bearing according to claim 2, characterized in that: its two ends are respectively provided with thrust positions (6, 7), and the thrust positions (6, 7) at both ends are respectively set on the bearing The end face of the seat (1) and the bearing bush (5); a wear-resistant gasket (4) is provided between the end face of the porous wear-resistant sintered sleeve (2) and the thrust position (7) of the end face of the bearing bush (5) . 4. The self-compensating lubricating oil-impregnated bearing according to claim 3, characterized in that: the porous wear-resistant sintered sleeve (2) and the wear-resistant gasket (4) are sintered bodies of Fe-Ni-Cu-based powder metallurgy materials, and the sintered bodies It is made of Fe, Ni, Cu, pore-forming agent and solid lubricant mixed, formed by cold molding and sintered under vacuum at 1020-1150°C; the weight percentage ratio of the above components is: Fe 50-70%, Ni 20-30%, Cu 5-10%, pore forming agent 2-8%, and the balance is solid lubricant. 5. The self-compensating lubricating sliding bearing according to claim 4, characterized in that the porosity of the sintered body is 15-30%. 6. The self-compensating lubricating sliding bearing according to claim 4, characterized in that the titer of the high-temperature lubricating grease (3) is higher than the service temperature of the lubricating oil impregnated in the sintered body during the preparation process.