JPS6218738Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a lubrication structure that uses magnetic fluid as a lubricant for ultra-high-speed train axle bearings. It is connected to a suction pipe with cooling fins installed in the middle of the suction pipe pulled out from the hole, and the discharge port is connected to a flow path drilled in the center of the axle shaft neck, and a radial flow path that is integrated with the inside of the bearing is drilled radially from there. The invention relates to a forced circulation lubrication structure.

Conventionally, bearings for high-speed trains, i.e. Shinkansen train axles, have a large d x n value (bearing inner diameter x rotational speed).
Grease lubrication produces a large amount of heat due to poor lubrication and grease stirring resistance, which can cause seizure, so oil lubrication is used. In the case of lubrication, the temperature of the lubricating oil increases significantly, and the lubricating performance decreases significantly as a result, and the development of higher performance lubricants and lubrication structures is desired.

The present invention was made to eliminate the above-mentioned drawbacks, and by making minimal modifications to the existing Shinkansen train axle, or by building a completely new one, a magnet is attached to the internal spacer gap, etc., and the magnetic force is According to
Magnetic fluid with excellent heat capacity and thermal conductivity as a lubricant (iron hydroxide as a ferromagnetic material by adding fine powder of iron oxide to a base liquid such as carbon fluoride, diester, silicone oil, etc. with the help of an activator) A liquid supply pump that is operated by the rotation of the axle is attached to the tip of the axle neck, and the suction port of the pump is fixed to the lubricated surface of the bearing rolling element to prevent it from scattering. is connected to a suction pipe with cooling fins installed in the middle of the oil sump hole in the oil sump, and the discharge port is connected to a flow path drilled in the center of the axle shaft neck. The present invention provides a structure in which an integrated radial flow path is provided to force the circulation of magnetic fluid as a lubricant.

Embodiments of the present invention will be specifically described below with reference to the drawings. Figure 1 shows the cross section of existing high-speed (Shinkansen) train axle bearings, including double-row cylindrical roller bearing 1,
A ball bearing 2 is inserted into an axle neck 4 of an axle 3, covered with an axle box body 5, and the end of the axle is covered with a front cover 6. An oil sump 13 provided at the bottom of the axle box body 5 is filled with turbine oil as a lubricant up to the middle of the rolling elements 10 of the ball bearing 2, and the rolling elements 10 are partially immersed in the oil sump 13. The lubricant is applied to the rolling element surface for lubrication. In addition, 7 is an oil plug and a hole, 8 is an oil seal, 9 is an outer ring, 11 is an inner ring,
12 is a retainer, and 14 is a spacer.

Fig. 2a shows the cross-sectional configuration of an axle bearing for an ultrahigh-speed train according to the present invention, in which a ring-shaped solid magnet 18 is installed in the spacer gap, and the lines of magnetic force 21 emitted by the magnet 18 act as a lubricant. The magnetic fluid 15 is sufficiently spatially restrained on the rolling element surfaces 16 of the double-row cylindrical roller bearing 1 and the ball bearing 2 to perform lubrication without uneven lubrication. When renewing or replacing lubricating oil, use the cooling fins 23 provided in the oil plug and the borehole 7.
The magnetic fluid 15 stored in the oil sump 13 is sent through a filter 25 through a suction pipe 2 by a liquid supply pump 24 that operates as the axle 3 rotates. A radial flow path 27 provided in the axle 3 and a radial flow path 28 provided in the inner ring 11 are connected to each other via an in-shaft flow path 26 provided in the axle 3.
The structure is such that a magnetic fluid 15 as a lubricant is forcibly fed onto the surface of the inner ring 11 of the bearing, that is, the rolling element surface 16, to lubricate it. Axle 3
Since there is a possibility that the shaft neck 4 and the inner ring 11 of the axle are displaced during movement, the lubricant pumping is not hindered even if the radial flow passage 27 in the axle and the radial flow passage 28 in the inner ring are displaced from each other. A circumferential groove 29 is provided around the shaft neck 4. 17 is a magnetic fluid applied to the shaft neck, 19 is a ring-shaped solid magnet at the tip of the shaft neck, and 20 is a ring-shaped solid magnet in the oil seal groove. FIG. 2b shows a cross section taken along line AA. Note that 9 is an outer ring, 10 is a rolling element, 11 is an inner ring, 16 is a rolling element surface, 25 is a filter, 27 is a radial flow path in the axle, 28 is a radial flow path in the inner ring, and 29 is a circumferential groove.

3a and 3b show the structure of an electromagnetic pump as an embodiment of the liquid supply pump in the above-mentioned forced circulation liquid supply structure, in which a gear mounting flange 30 is implanted into the end face of the shaft neck 4 with a flange stud bolt, and the flange 30 is equipped with a large gear 30' that transmits rotation to a small gear 31'. The casing made of non-magnetic material such as plastic material has a conical inner casing cylinder 32 and an outer casing cylinder 33.
Inside the casing inner cylinder 32, there is a gear mounting flange 3 attached to the tip of the shaft neck 4.
By rotating the large gear 30' of 0, the small gear 31' supported by the support flange 39' is rotated at high speed, thereby rotating the rotor mounting flange 31 attached to the tip of the small gear 31'.
Furthermore, due to the rotation of the rotor mounting flange 31,
A conical rotor 40 mounted on the rotor mounting flange 31 rotates. Since a rotor-embedded solid magnet 41 is embedded in the surface of the rotor 40, the magnetic fluid in the pump chamber 36 is rotated by the remote positioning action of magnetic lines of force, and moves forward toward the pump chamber outlet 37 by the action of centrifugal force. do. Due to this movement, the magnetic fluid flows from the pump chamber outlet 37 to the check valves 34, 34' and the swivel joint 42.
The oil is sent out to the radial flow path 28 in the inner ring via the shaft flow path 26 and the radial flow path 27, and after being lubricated on the rolling element surface 16, it returns to the oil sump 13 to complete one cycle. In the figure, 35 is a pump chamber inlet, 38 is a flow direction, and 39 is a cover flange. In addition, in the above embodiment, an electromagnetic pump was used as an example of the liquid supply pump 24, but
Other pumps, such as conventional gear pumps, can also be used in the same manner. At the tip of the shaft neck, due to the interaction between the magnet 19 at the tip of the shaft neck and the magnetic fluid 17 applied to the shaft neck, on the other hand, at the shaft neck, the interaction between the magnet 20 in the oil seal groove and the magnetic fluid 17 applied to the shaft neck occurs. By interaction with the fluid 17, the tip of the shaft neck and the neck of the shaft are completely sealed, preventing infiltration of rainwater etc. and leakage of lubricant.

As explained above in the embodiments, the structure in which a magnetic fluid is used as a lubricant for the ultra-high-speed train axle bearing according to the present invention, and the fluid is forcibly supplied and circulated by the rotation of the axle, can be used to minimize the Furthermore, compared to conventional methods, the lubricant has a large heat capacity and good thermal conductivity, so it has the advantages of requiring a small amount of lubricant and being capable of high-speed lubrication. The effect of contributing to speeding up is significant.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional high-speed train axle bearing, Fig. 2a is a front sectional view of the axle bearing according to the present invention, Fig. 2b is a sectional view of line AA in the same front section, and Fig. 3 Figures a and b are cross-sectional views of an electromagnetic pump in a lubricant forced circulation structure. 1...Double row cylindrical roller bearing, 2...Ball bearing, 3...
... Axle, 4 ... Axle head, 5 ... Axle box body, 6 ... Front cover, 7 ... Oil plug and borehole, 8 ... Oil seal, 9 ... Outer ring, 10 ... Rolling element, 11 ... Inner ring, 12...Cage, 13...Oil sump, 14...
Spacer, 15...Magnetic fluid, 16...Rolling element surface, 1
7...Magnetic fluid applied to the shaft neck, 18...Magnet in the spacer gap, 19...Magnet at the tip of the shaft neck, 20...Magnet in the oil seal groove, 21
...Magnetic field lines, 22...Suction pipe, 23...
...Cooling fin, 24...Liquid supply pump, 25...
...Filter, 26... Channel in the shaft, 27... Radial channel in the axle, 28... Radial channel in the inner ring, 29... Inner groove, 30... Gear mounting flange, 30'... Large gear, 31 ... Rotor mounting flange, 31'... Small gear, 32... Casing inner cylinder, 33... Casing outer cylinder, 34, 34'...
...Check valve, 35... Pump chamber inlet, 36... Pump chamber, 37... Pump chamber outlet, 38... Flow direction, 39... Cover flange, 39'... Support flange, 40... Rotor, 41...Solid magnet embedded in the rotor, 42...Swivel joint, 43...Rotation direction.

Claims (1)

[Scope of utility model registration request] A lubrication method that uses magnetic fluid as the lubricant for ultra-high-speed train axle bearings and binds the magnetic fluid to the rolling element surfaces of double-row cylindrical roller bearings and ball bearings by magnetic force, which is attached to the tip of the axle neck. A conical rotor with a small gear connected to a large gear, a solid magnet attached to the small gear, and a casing outer cylinder and a casing inner cylinder provided on the outer periphery closest to the rotor. A liquid supply pump consisting of a conical pump chamber is installed in the space within the support flange and cover flange so that the large gear at the end of the axle shaft and the small gear of the liquid supply pump are connected, and the liquid supply pump is cooled. It communicates with the oil sump provided at the bottom of the axle box body through a suction pipe with fins, and also communicates with the radial flow path provided in the inner ring through the shaft center flow path and radial flow path provided in the center of the axle. A ring-shaped solid magnet 18 is placed in the gap of the spacer 14 of the bearing, and a ring-shaped solid magnet 18 is placed at the tip of the shaft. A lubrication structure for an ultra-high-speed train axle bearing, characterized in that a ring-shaped solid magnet 19 is attached to the shaft neck, and a ring-shaped solid magnet 20 is attached to the oil seal groove of the shaft neck.