JP3924980B2 - Bearing lubrication and cooling system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lubrication and cooling device for a rolling bearing with high cooling efficiency.
[0002]
[Prior art]
Various lubrication and cooling devices for rolling bearings have been proposed.
[0003]
FIG. 6 shows an apparatus for performing lubrication and cooling with oil and air.
The rolling bearing 10 is inserted between the outer race 11 and the inner race 12 with the ball 13 held by the retainer 14, and the outer race 11 and the inner race rotate relative to each other.
The lubrication and cooling nozzle 20 has injection holes 21 and 22 facing the space of the ball 13 and the retainer 14, and supplies the fluid from the mixing valve 23 between the ball and the race. Oil 24 and air 25 are supplied to the mixing valve 23, and the mixing valve 23 mixes the oil 24 and air 25 to generate a mixed fluid 26, which is injected from the injection holes 21 and 22. The mixed fluid 26 achieves lubrication and cooling of the rolling bearing.
[0004]
FIG. 7 shows a lubrication by an oil mist and a cooling device.
The sprayer 30 is supplied with oil 31 and air 32 to generate oil mist. The oil mist 33 is supplied to the rolling bearing 10 from the injection holes 21 and 22 of the lubrication cooling nozzle 20.
[0005]
FIG. 8 shows a jet lubrication device, in which oil 41 in an oil tank 42 is processed by a pump 40, and an oil jet stream 43 is supplied to the rolling bearing 10 from the injection holes 21 and 22, forcing lubrication and cooling. To do.
[0006]
FIG. 9 shows an under-lace lubrication device using an oil jet.
The inner race 12 of the rolling bearing 10 supports the main shaft 50. The main shaft 50 has a center hole 52 and a small diameter hole 51 that penetrates the inner race 12. The oil jet 43 from the oil pump 40 passes through the small diameter hole 51 from the main shaft center hole 52 and is forcibly injected into the inner race 12.
For example, Japanese Patent Laid-Open No. 6-66324 discloses a cooling device for a rolling bearing using air.
[0007]
[Problems to be solved by the invention]
As a lubrication system for rolling bearings, grease lubrication is the most basic lubrication system, but it cannot be used for a high-speed rotating spindle or a device that dislikes thermal displacement because it generates a lot of heat.
[0008]
Jet lubrication and under-race lubrication supply a large amount of lubricating oil directly to the bearing, so that the lubrication and cooling performance is excellent. However, the lubricating oil sealing technology and the lubricating oil cooling device are important.
[0009]
Oil-air lubrication and oil mist lubrication are methods in which air and a small amount of lubricating oil are mixed and supplied to the bearing from the lubricating oil nozzle, and since the heat generation is small and no processing of the lubricating oil is required, the apparatus is small and most popular.
[0010]
However, some measures are required when further increasing the speed and accuracy of the rotating spindle using oil-air lubrication and oil mist lubrication.
Accordingly, the present invention proposes a nozzle that dramatically improves the cooling efficiency while maintaining the lubrication performance of oil-air lubrication and oil mist lubrication.
[0011]
[Means for Solving the Problems]
Lubrication of bearings of the present invention, the cooling device, as basic means, a ring-shaped nozzle body, and the lubricating oil injection hole for supplying provided on a side surface lubricant facing the bearing of the nozzle body, the nozzle body A plurality of cooling air injection holes provided at positions that do not interfere with the lubricating oil injection holes on the side surface, and a first ring groove provided on the outer peripheral portion of the ring-shaped nozzle body and connected to the lubricating oil injection holes When inserted while holding the balls between the second and a ring groove, the outer race and the inner race coupled to said injection holes of the cooling air is provided in parallel with the first ring groove a lubrication cooling system for a bearing having a retainer to be, the lubricant injection hole is injected toward between between the outer race and the nozzle body side retainer and the inner race of the nozzle body side retainer In each plurality distribution toward between the first from the radial blind hole in towards the inside of the nozzle body which is provided in the ring groove and the outer race and the nozzle body side retainer and between the inner race of the nozzle body side retainer The cooling air injection hole is disposed so as to be injected toward the nozzle body retainer.
[0012]
Furthermore, the temperature of the cooling air can be set to −10 ° C. to −20 ° C.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an explanatory view showing the overall configuration of the present invention, FIG. 2 is a view taken in the direction of arrow A in FIG. 1, FIG. 3 is a view taken in the direction of arrow B in FIG. FIG.
The nozzle device generally indicated by reference numeral 100 has a ring-shaped nozzle body 110 and is disposed adjacent to the rolling bearing 10. The rolling bearing 10 includes an outer race 11 and an inner race 12, and a ball 13 is held by a retainer 14.
[0014]
The nozzle body 110 is provided with two ring grooves 120 and 140 in parallel. The first ring groove 120 opens toward the outer periphery of the main body, and the oil in the oil tank 210 is mixed with air by the pump 200 and pressurized, and is introduced as oil mist through the line 220.
[0015]
The first ring groove 120 has a bottomed hole 121 in the radial direction toward the inside of the nozzle body 110. In the present embodiment, the two bottomed holes 121 are arranged in line symmetry. The number of the bottomed holes 121 can be selected as appropriate.
The bottomed hole 121 has two injection holes 122 and 124 that open to the rolling bearing 10 side. The two injection holes 122 and 124 are opened toward the raceway between the outer race 11 and the inner race 12 and the rolling surface of the ball.
[0016]
The oil supplied to the first ring groove 120 is injected from the injection holes 122 and 124 of the two bottomed holes 121 and lubricates the rolling surfaces between the ball 13 and the outer race 11 and the inner race 12.
The second ring groove 140 provided adjacent to the first ring groove 120 of the nozzle main body 110 opens to the outside of the main body 110, and air from the air supply source 300 is supplied via the line 310.
[0017]
The second ring groove 140 is connected to a plurality of injection holes 142 opened toward the ball rolling surface of the rolling bearing. Many injection holes 142 are provided on the circumference. A suitable hole having a diameter of about 1 mm to 5 mm is used.
[0018]
The air supply source 300 may be a unit that compresses and supplies air at room temperature using an ordinary air compressor, but is preferably a device that supplies cooling air of −10 ° C. to −20 ° C. By using it, the cooling effect can be improved.
The cooling air supplied to the second ring groove 140 via the line 310 is injected from the injection hole 142 toward the ball rolling surface of the rolling bearing 10 to cool the frictional heat generated on the rolling surface.
[0019]
The communicating portions 122a and 124a of the lubricating oil injection holes 122 and 124 with the bottomed hole 121 and the communicating portions 142a of the air injection holes 142 and the ring groove 140 are processed into an R shape by fluid polishing, and are smooth. Injection is achieved.
[0020]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the cooling property with respect to heat_generation | fever can be improved, ensuring the lubrication of the rolling bearing which supports a main shaft etc.
According to experiments, with normal lubrication and cooling methods, this device is used for bearings that have been confirmed to increase in temperature by 10 ° C during rotation, and cold air at -10 ° C is used to improve the temperature to 5 ° C. It was done. A further effect can be obtained by optimizing the amount of cold air and the temperature.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing the overall configuration of a device of the present invention.
FIG. 2 is a view taken in the direction of arrow A in FIG.
FIG. 3 is a view taken in the direction of arrow B in FIG.
FIG. 4 is an enlarged view of a main part of the device of the present invention.
FIG. 5 is an enlarged view of a main part of the device of the present invention.
FIG. 6 is an explanatory diagram of a conventional apparatus.
FIG. 7 is an explanatory diagram of a conventional apparatus.
FIG. 8 is an explanatory diagram of a conventional apparatus.
FIG. 9 is an explanatory diagram of a conventional apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Rolling bearing 11 Outer race 12 Inner race 13 Ball 14 Retainer 100 Lubrication and cooling nozzle device 110 Nozzle body 120 First ring groove 122, 124 Oil injection hole 140 Second ring groove 142 Air injection hole 200 Oil pump 300 Air supply source

Claims (2)

A ring-shaped nozzle body, a lubricating oil injection hole that is provided on the side of the nozzle body that faces the bearing and supplies lubricating oil, and a plurality of cooling holes that are provided at positions that do not interfere with the lubricating oil injection hole on the side of the nozzle body An air injection hole, a first ring groove provided on an outer peripheral portion of the ring-shaped nozzle body and connected to the lubricating oil injection hole, and the cooling air provided in parallel with the first ring groove. A lubrication and cooling device for a bearing having a retainer inserted in a state where a ball is held between an outer race and an inner race, and having a second ring groove connected to the injection hole of the outer race. oil injection hole, so as to be jetted between between the outer race and the nozzle body side retainer and the inner race of the nozzle main body side retainer, of the nozzle body provided in the first ring groove Respectively toward between the blind hole in the radial direction toward the side of the outer race and the nozzle body side retainer and between the inner race of the nozzle main body side retainer arranging a plurality of the injection holes of the cooling air, said nozzle body A lubrication and cooling device for bearings arranged to be injected toward the retainer.   2. The bearing lubrication and cooling device according to claim 1, wherein the temperature of the cooling air is −10 ° C. to −20 ° C. 3.

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