KR100457468B1 - hermetic centrifugal hydraulic bearing method - Google Patents

Abstract

SUMMARY OF THE INVENTION The present invention is a hermetic hydraulic bearing device, which is capable of installing at least one internal sharing tank along an axial interior of an axial core, injecting lubricant, and sealing the opening so that the lubricant is stored in the internal sharing tank. In addition, at least one annular recess is formed on the outer diameter of the shaft core, and at least one oil distribution hole is provided between the annular recess and the inner share tank. A closed space for lubricating oil storage is formed between the circumferential recess, the inner wall of the oil sharing tank and the bearing cover, so that the lubricant is sealed inside, and the circulating fluid can flow from the inner sharing tank to the circumferential opening. will be.

Description

Hermetic centrifugal hydraulic bearing method

The present invention relates to a hermetic hydraulic bearing device, and more specifically, to seal the lubricating oil and the like in a bearing cover without installing a hydraulic pressure supply device outside the bearing device to facilitate the hydraulic lubrication operation by using the centrifugal force during rotation of the shaft. It was made possible.

Conventional bearing devices are capable of bearing a high degree of rotation and load, or the lubricity between the shaft and the bearing cover is extremely important for improving precision and service life, but the disadvantages of various bearings are as follows.

First, powder metallurgical lubricated bearings use oil-bearing bearing cover to lubricate oil by using high heat generated when the shaft is rotated. Since the amount of lubricant contained in the bearing is relatively small, the rotational speed of the shaft core is limited by the amount of the lubricant flowing out. If the rotation speed of the shaft core is too high, it may cause a malfunction due to lack of lubrication, and because of the low flow rate, it does not effectively reduce the high heat generated by the shaft rotation friction, so the lubricant easily evaporates and its lubricity is degraded. Due to the high temperature caused by axial rotational failure, high temperature caused by axial rotational friction, the bearing causes thermal expansion and changes in the size of the bearing cover and shaft, and after a period of use, the lubricant contained in the self-lubricating bearing It is easily lost and dried out, or dust and foreign matters can block the lubricating oil leak hole, causing malfunction. Further, since the bearing cannot effectively lower the lateral force action generated when the shaft core is loaded, the bearing cover easily causes the shaft core and mutual wear. For this reason, self-lubricated bearings have a relatively short service life, and due to their relatively low rotational speed and load, their application range is extremely limited.

Second, taking groove-type bearings as an example, this method installs grooves of various types in the inner ring of the bearing cover or the outer ring of the shaft core and applies lubricant to the groove to accommodate a relatively large amount of lubricant between the shaft core and the bearing cover. By doing so, it can reduce the bad operation. Grooved bearings can be applied to various kinds of materials such as metal or ceramic materials, but the drawbacks are as follows.

Since the lubricating oil is in a positive pressure state when the shaft is rotated, the bearing cover cannot easily reduce the lateral force generated when the shaft is loaded. Although the lubricant contains a relatively large amount of lubricant inside, the lubricant is likely to leave the part requiring lubrication due to centrifugal action. For this reason, grooved bearings also cannot overcome traditional rotational speeds and load limits, nor can they prevent high heat and thermal expansion from friction.

Third, ball bearings (rolling type) and column bearings (rolling type such as pillars) are both higher than those of general bearings, but the drawbacks are as follows.

There are relatively many parts, and the precision demand of production is relatively high. The price is relatively expensive. Bearings of the mainstream are affected by the size change that causes thermal expansion at high speeds or under high loads, and the precision and stability thereof are lowered accordingly.

Fourth, the current conventional hydraulic bearing device is to inject lubricating oil into the bearing structure through an external device, etc., and simultaneously pressurize the lubricating oil so that the positive oil is generated to act between the bearing cover and the shaft center. It should be possible to achieve the effect of lubrication. The positive pressure action of the lubricating oil enables the bearing to achieve sufficient lubricity and maintain good rotation for a long time, but the hydraulic oil supply device such as the oil supply line and the pressurized power system must be installed outside the bearing so that it is relatively large. It requires an installation space, requires a separate power source to drive the pressurized power unit, and has the disadvantage of requiring a lot of installation cost, so it is applied only to high volume and high value-added machine tools. There was a closed end such as not being applied to the bearing.

The present invention is to store and seal the lubricating oil in the inner share tank inside the shaft without the need to install a separate hydraulic pressure supply device to the outside of the bearing in order to eliminate the above-mentioned closed end and the centrifugal force generated during the rotation of the shaft to the lubricant It flows from the inner tank to the annular groove between the shaft core and the inner wall of the bearing cover, and creates a positive pressure in the place, causing the effect of hydraulic lubrication, and the centrifugal force when the shaft stops rotating. After being lost, the lubricating oil of the ring-shaped mouth is returned by the negative pressure inside the inner core tank of the shaft, so that the lubricating oil can be re-stored in the inner core tank. It can be applied to micro bearings, thereby reducing maintenance and maintenance costs and improving bearing performance and lifespan. When standing described in detail by the accompanying drawings, that invention to be used for a long time as follows.

1 is an exploded perspective view of the present invention.

(A), (b) is a longitudinal cross-sectional view of this invention.

Figure 3 is an exploded perspective view of another embodiment of the present invention.

Figure 4 (a), (b) is a longitudinal cross-sectional view of another embodiment of the present invention

<Explanation of symbols for the main parts of the drawings>

One; Hydraulic bearing device 2; Bearing cover 3,11; My share tank 4; Oil distributor

5; Outlet 6,12; Circulatory floating moth 7; Axial 8; Oil absorption material 9; Opening

10; Oil stopper

Referring to FIGS. 1, 2 (a) and (b), which are one of the ideal embodiments of the present invention, the hydraulic bearing device 1 is composed of a shaft core 7 and a bearing cover 2 as a bearing cover 2. ) May be made of various materials such as metals or ceramics, and is covered on the outer diameter of the shaft core (7), the shaft core (7) is a minimum length of a certain length along the inner direction of the shaft from the opening (9) at one end thereof After making one inner share tank 3, inserting lubricating oil into the inside share tank 3 through the opening 9 (not shown in the drawing), and then sealing the opening 9 with an oil stopper 10 to seal it. When the oil storage chamber is formed and the oil-resistant tank 3 is microscopic, the lubricant can be adsorbed by capillary suction, so that it is not necessary to put the oil-absorbing material 8 (oil absorbing cotton or sponge rod, etc.) and the oil-resistant tank (3). Is in a relatively large state, the oil absorption material (8) can be put to help the absorption and storage of lubricating oil Can. In the present embodiment, the oil outlet hole 4 intersects and communicates with the oil distribution hole 4 at right angles at the inner end of the inner sharing tank 3, and the end outlet 5 of the oil distribution hole 4 is mutually with the annular recess 6. Correspondingly, the annular recess 6 may be installed on the outer diameter of the shaft 7 (see FIGS. 1 and 2 (a)) or on the inner wall of the bearing cover 2 (see FIG. 2 (b)). The annular recess-type opening 6 penetrates with the other one end of the oil distribution hole 4 so that one end of the oil outlet 5 is formed so that the bearing cover 2 is covered with the outer diameter of the shaft center 7. An enclosed space for storing a kind of lubricating oil is formed between the mold opening 6 and the oil distribution hole 4, the inner wall 3, and the inner wall of the bearing cover 2. As shown in the above structure, when the shaft center 7 rotates, the lubricating oil in the inner share tank 3 is centrifugally applied and flows out from the outlet 5 to flow out into the recessed recess 6, and the lubricating oil is required. After filling the shaping hole 6, the pressure is continuously increased by the centrifugal force of the lubricating oil that flows out. Therefore, a kind of positive pressure is created inside the circumferential shaping hole 6 so as to provide a high degree of lubrication and lateral force. It can achieve hydraulic lubrication effects such as reduced action, reduced friction, reduced temperature rise, improved internal load capacity and extended service life. In addition, since the lubricating oil inside the inner-coating tank 3 flows out of the outlet port 5 under the centrifugal force action, it creates a kind of negative pressure (vacuum and capillary phenomenon), so when the shaft core 7 stops rotating. As the centrifugal force stops, due to the negative pressure phenomenon of the inner sharing tank 3, the lubricant inside the recessed recessed mouth 6 is sucked back from the outlet port 5 into the inner sharing tank 3 and stored so that it does not dry out. This is continued until the negative pressure phenomenon in the internal sharing tank 3 disappears, and the internal sharing tank 3 and the annular recessed groove 6 are formed to maintain the same pressure, or some of the lubricant oil is a circular recessed type. By staying inside the retaining hole 6, the shaft center 7 helps to be used for lubrication when starting to rotate again. By repeating the above-described action in this way, the hydraulic lubrication action is maintained when the hydraulic bearing device 1 rotates for a long time.

3, 4 (a), (b) is another embodiment of the present invention, the hydraulic bearing device (1) is also composed of a combination of the shaft center (7) and the bearing cover (2), among which The bearing cover 2 may be made of various materials such as metals or ceramics, and is overlaid on the outer diameter of the shaft core 7, and installs at least one internal sharing tank 11 upward along the diameter of the shaft core 7, The inner sharing tank 11 may be installed along the first direction in the shaft center 7, and for convenience of understanding, the first direction is referred to as the X direction in other embodiments, or the second direction in the shaft center 7 may be set. According to another embodiment, the second direction is referred to as the Y direction, and the inner sharing tank 11 may be installed after a predetermined distance from the first direction X and the second direction Y, respectively (FIG. 3, 4 (a) and 4 (b)), and lubricating oil is injected into the inner sharing tank 11 (not shown). In view of the size of the oil-resistant tank 11, a material for absorbing oil (for example, oil absorbing cotton or sponge rod, etc., a person skilled in the art may be replaced by another object), that is, the oil-resistant tank 11 may be In the micro state, since the lubricating oil can be adsorbed by the capillary action, there is no need to add the oil absorbing material 8 separately, and when the oil-resistant tank 3 is relatively large, the oil absorbing material 8 can be inserted as necessary. The absorbent material 8 may assist in the absorption and storage of the lubricating oil. In other embodiments, the two ends of the inner sharing tank 11 correspond to each other with the annular recess 12, among which the annular recess 12 may be installed on the outer diameter of the shaft 7 (FIG. 1, 4 (a)) or on the inner wall of the bearing cover 2 (see FIG. 4 (b)), and at least one end of the annular recess 12 and the inner sharing tank 11 penetrate each other. The end portion forms an outlet port 5 (see FIGS. 3, 4 (a) and (b)), whereby the annular recess 12 is formed when the bearing cover 2 is covered on the outer diameter of the shaft center 7. And a sealed space for storing one lubricant oil between the inner wall of the inner share tank 11 and the bearing cover 2 (see FIGS. 4 (a) and 4 (b)). When the device 1 rotates, the lubricating oil is allowed to flow repeatedly between the inner share tank 11, the outlet port 5 and the annular recess 12 without any difference from the principle of operation described in the previous embodiment. As fluid pressure bearing device 1 will be able to maintain smooth fluid pressure lubrication even during prolonged rotation.

The present invention thus eliminates the need to install a separate hydraulic pressure supply device outside the hydraulic bearing device (1), thereby reducing facility costs, reducing volume, reducing maintenance costs, and commonly used in general bearings and micro bearings. Not only can it be rotated for a long time there is an effect that the lubricant is not lost.

Claims (2)

Inner portion of the outer bearing cover 2 of the hydraulic bearing device 1 is formed with an inner sharing tank 3 along the axial direction and drilled through the oil distribution hole 4 in a direction perpendicular to the inner end portion, so that the outlet port 5 of the end portion is formed. Insert the shaft core (7) formed with the annular recess (6) in communication with the inside of the inner common tank (3), the oil-absorbing material (8) inside the opening (9) by sealing the oil plug (10) Hermetic hydraulic bearing device. The sealed hydraulic bearing according to claim 1, wherein the inner share tank (11) is formed separately along the diameter of the shaft core (7), and the recessed groove (12) is formed on the inner wall of each outlet facing bearing cover. Device.