RU2337848C2 - Device for filling oil into motor-axle bearing with constant level of lubrication - Google Patents

Abstract

FIELD: transportation.

SUBSTANCE: filling axle bearing is done through pneumo-hydraulic sprayer. On gooseneck in the zone of working chamber, there is signal port (9) at a distance of 48 mm from the lower part of the retaining cone, joined to sensor (15) for excess pressure through pneumatic pipeline (10), to which air at 0.1 MPa pressure flows.

EFFECT: more reliable device and longevity of axle bearing; possibility of single filling of axle box and low expenditure of lubricant.

3 cl, 2 dwg

Description

The invention relates to the field of railway transport and can be used for refueling axle boxes of motor-axial bearings (MOS) of locomotives.

The disadvantage of the existing method of refueling axle boxes in the railway transport is the manual filling of lubricant. Lubricant is supplied through the hose from the pump until grease from the bearings of the bearing assembly appears. However, it is not possible to accurately determine the required dose of lubricant. Both insufficient and excessive supply of lubricant to the assembly are possible. In the first case, there is a rapid deterioration of expensive bearings and their failure. With excessive supply, the loss of lubricant, the cost of acquiring it, the contamination of the production areas and access roads with grease increase significantly, and the ecology of the environment deteriorates.

A device for dispensing grease (patent No. 2161946) is known, mainly for a single dispensing of grease in large volumes supplied to large friction units. A device for dispensing grease contains a reservoir for lubrication, a rotary pump, a four-line on-off dispenser, connecting and supply pipelines and an electrical control system. The dispenser is made in the form of a sealed cylinder in which a piston is installed, guide bushings are mounted in the cylinder covers parallel to its axis, in which the rods are movably mounted. On the inner ends of the rods located in the cylinder, thrust washers are fixed that interact with the end surfaces of the piston, springs are installed between the thrust washers and the cylinder covers on the rods. The electrical control system contains two limit switches interacting with the outer ends of the movable cylinder rods. The disadvantage of this device is the possible inaccurate operation of the pressure sensor for several reasons:

- when filling a small capacity (such as a MOSBOX), the pressure sensor has a low sensitivity;

- clogging of the pipeline, as a result - increased pressure of the lubricant;

- inaccuracy in the measurement of the pressure sensor due to the temperature of the lubricant other than that planned by the sensor;

- possible measurement error of the pressure sensor, since the function of the dependence of pressure on the liquid level varies monotonously;

- after filling, the liquid continues to flow out of the filling element.

A device for filling oil with a two-chamber axle box MOS (patent for the invention of the Russian Federation No. 2273580) is known. Two identical thermistors are placed on the oil filling tube of this device in the area of the axial box of the motor-axial bearing, each of which is connected to the corresponding input of the comparison unit, the output of which is connected to the alarm unit, while one of the thermistors with its middle part is at the end of the air pipe and the second is above the end of the specified tube. The dosing process consists in the following: the heated lubricant enters through the oil filling tube into the MOS axle box filling chamber, and when it is filled, the lubricant enters the axle box working chamber. When the heated grease reaches the level of the lower thermistor, its temperature rises, the balance of resistances at the input of the comparison unit is violated, which leads to the appearance of the output voltage of the pump shutdown relay, which supplies oil to the oil filling pipe. Thermistors are located inside the oil filling tube, separated from the lubricant by a U-shaped plate and closed on the outside with a perforated protective cover.

The disadvantages of this design include:

- the need to clean the thermistors from lubrication before using the refueling unit, as the threshold of operation of the comparison unit increases;

- immersion in the grease of both thermistors at the initial stage of refueling may not provide further shutdown of the refueling process;

- during prolonged refueling with heated grease, the oil filling tube is heated, which leads to a failure of the comparison unit and, as a result, to the failure of the lubricant supply system.

The objective of the invention is the provision of operational and guaranteed control of the oil level in the working and refueling chambers of the MOS axle box during the refueling process.

The operation of the axle box with a constant level of lubrication (Fig. 1) is as follows: braids 7 made from wool padding in contact with the motor-axial bearing 8 are immersed in grease 6, which rises up along the braids 7, thereby lubricating the surface of the bearing 8. If the lubrication level in chamber 1 has dropped below the level of channel 4, then air will begin to flow from chamber 1 to chamber 2, and the vacuum in chamber 2 will decrease, as a result of which the lubricant from chamber 2 passes through channel 3 to chamber 1. When refueling the MOSFOX axle box with a remote control, the lubrication first fills chamber 2 through the conical opening of the channel 3 and when it is filled up to the chamber 1 through the channel 4.

The axle box is refueled through a pneumohydro console, and on the gander in the area of the working chamber there is a signal hole at a distance of 48 mm from the bottom of the landing cone connected to the overpressure sensor through a pneumatic pipe to which air with a pressure of 0.1 MPa enters.

A signal hole 9 was made on the pneumohydropult (Fig. 2), connected to the signal pneumatic pipe 10, into which air was supplied from the compressor 16 with a pressure of 0.1 MPa, and located on the gander in the zone of the working chamber at a distance of 48 mm from the landing part. On the gander, in addition to the signal hole 9, there is a valve 11, consisting of a spring and a ball, which prevents the pouring of residual grease when the device stops working. The normal state of the valve 11, in the absence of oil pressure, is closed. On the pneumatic control panel there are buttons for turning on and off the device 14, as well as lamps for indicating the operation of the device 13.

The general operation of the filling device is carried out as follows: a pneumohydro console is installed in the filling hole of the axle box, which is inserted with its end into the conical hole, after which the pump (not shown) for oil supply is turned on. Lubrication through the pneumohydro console begins to fill the axle box chambers. When the lubricant overlaps the signal hole 9, the air pressure in the signal pneumatic line instantly changes, which triggers the overpressure sensor 15, the latter breaks the supply circuit of the lubricant supply device, the lubricant supply stops, and the red indicator on the pneumatic control panel lights up.

Through the use of an overpressure sensor, the reliability of the device and the dosing accuracy are significantly increased. Cases of both insufficient and excessive supply of lubricant to friction units are excluded. The device is characterized by extreme simplicity. Grease consumption is reduced, grease pollution in production facilities is reduced, and the environmental situation in the locomotive depot and adjacent access roads is improved. Thus, the application of the proposed device ensures the achievement of the goal of the invention and can be recommended for widespread use when refueling axle boxes of motor-axial bearings of VL series locomotives.

Literature

1. Device for dispensing grease. Patent No. 2161946. Application No. 98120322 of 12/12/1998. Date publ. 06/27/2000.

2. Device for refueling a two-chamber axle box axial motor bearing. Patent for the invention of the Russian Federation No. 2273580. Publ. 04/10/2006 Bull. No. 10.

Claims (3)

1. A device for filling the lubricant of a double-chamber axle box of a motor-axial bearing, including a baffle with a hole located in a tank divided into a filling and working chamber, a tube, the upper end of which is located in the filling chamber and connected to the atmosphere, and the lower end is attached to the partition and communicated with a working chamber, as well as an oil filling tube located in said tube, the lower end of which is aligned with an opening communicating the working and filling chambers, and an air supply tube, one end of which is located in the upper part of the refueling chamber, and the other is in communication with the working chamber, characterized in that the axle box is refilled through a pneumatic control panel, and on the gander in the zone of the working chamber there is a signal hole at a distance of 48 mm from the bottom of the landing cone, connected with an overpressure sensor through the pneumatic pipe to which air arrives at a pressure of 0.1 MPa. 2. A device for refueling a two-chamber axle box of a motor-axial bearing according to claim 1, characterized in that the device uses an overpressure sensor that detects when the axle box is filled with grease. 3. The device for filling grease with a two-chamber axle box motor-axial bearing according to claim 1, characterized in that the device uses a valve to prevent leakage of grease after the end of filling axle box.

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