JPH1182756A - Bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To extend the life of a bearing by forming a gap space which is kept at the atmospheric pressure or higher between a lubricant-sealing member and a foreign matter-sealing member. SOLUTION: A bearing box 2 is fitted in the outer circumference of an axis 1 of a bearing apparatus and dust seals 3 are fitted respectively in the inner circumferential faces in both side parts of the bearing box 2. A bearing 4 fitted in the outer circumferential face of the axis 1 is housed in the middle part of the inside of the bearing box 2 and the inside of the bearing 4 is filled with a lubricant. Contact type grease seals 5 are installed respectively in both side parts of the bearing 4 to prevent the leakage of grease outside the bearing 4. Moreover, gap spaces 6 are formed respectively between the dust seals 3 and the grease seals 5 in both sides of the bearing box 2. A precision regulator 7 and a precision relief regulator 8 are connected with each of the gap spaces 6 through pipes 9, 10 to supply air to the gap spaces 6 or discharge air out of the gap spaces 6 responding to the inner pressure of the gap spaces 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricant seal member provided in parallel with a bearing fitted on the outer periphery of a shaft and for preventing lubricant filled inside the bearing from leaking out of the bearing. The present invention relates to a bearing device having a foreign matter sealing member for preventing foreign matter from entering the inside of the bearing.

[0002]

2. Description of the Related Art In a steel production system, for example, the operating environment conditions are severe such as exposure to dust such as iron oxide, cooling water or high temperature. Therefore, a conventional bearing device used therein is shown in FIG. It has been known.

FIG. 8 is a longitudinal sectional view showing the configuration of a main part of a conventional bearing device. This bearing device accommodates a bearing (rolling bearing) 802 fitted on the outer periphery of a shaft 801 and a bearing 802. A bearing box 803 fitted on the outer periphery of the shaft 801, and bearings 802 provided on inner circumferential surfaces on both sides of the bearing box 803.
And grease seals 804 and 804 made of synthetic rubber or the like for preventing the grease that has been collectively filled into the inside of the bearing box 803 from leaking out of the bearing box 803 to the outside. These grease seals 804 and 804 slide in contact with the outer peripheral surface of the shaft 801. And the bearing box 803
Grease supply port 80 provided on the outer surface of the upper part in the substantially central portion in the axial direction of
By filling grease from step 5, grease is periodically supplied from outside the bearing box 803 to the inside of the bearing 802 and the inside of the bearing box 803 collectively.

[0004]

However, in the conventional bearing device, grease is frequently filled from the grease replenishing port 805 in order to prevent the grease from flowing out and deteriorating due to high temperature or water intrusion. Maintenance is costly due to the need to replenish. A particular problem is that the pressure inside the bearing fluctuates due to temperature changes, and when the pressure inside the bearing rises, the grease seal 804 loses its sealing function and grease leaks outside the bearing 802 and outside the bearing box 803. In addition, when the internal pressure of the bearing 802 becomes low, the sealing function of the grease seal 804 is lost, and foreign substances such as water vapor, water, and dust are sucked in (the breathing action of the seal). Is to lead to early damage to the rolling surface of
As a result, the maintenance cost of the bearing device is enormous.

The present invention has been made in view of the above-mentioned problems of the above-described conventional technology, and an object of the present invention is to prevent foreign matters such as water vapor, water and dust from entering the inside of a bearing from the outside. An object of the present invention is to provide a bearing device that can reliably prevent intrusion, extend the life of a bearing, and reduce maintenance costs.

[0006]

According to a first aspect of the present invention, there is provided a bearing device which is provided with a bearing fitted around an outer periphery of a shaft and is filled with a lubricant filled in the bearing. In a bearing device having a lubricant seal member for preventing leakage to the outside and a foreign material seal member for preventing intrusion of a foreign material into the inside of the bearing, a bearing device having a lubricant seal member and a foreign material seal member A gap chamber that is maintained at a pressure higher than the atmospheric pressure.

According to the bearing device of the present invention, a lubricant seal member for preventing the lubricant filled in the bearing from leaking to the outside of the bearing and a lubricant for preventing foreign matter from entering the inside of the bearing. Since the gap between the foreign material seal member and the foreign material seal member is maintained at atmospheric pressure or higher, when the temperature rises, the lubricant inside the bearing expands and leaks to the outside of the bearing through the lubricant seal member. When the pressure inside the bearing drops and the pressure difference between the inside of the bearing and the gap chamber exceeds the pressure resistance value of the lubricant seal member, dry air from the gap chamber enters the bearing and adjusts the pressure inside the bearing. I do. On the other hand, since the gap chamber is always higher than the atmospheric pressure, it is possible to prevent foreign substances such as water vapor, water, and dust from entering between the foreign substance sealing member on the air side and the shaft.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.

(First Embodiment) First, a first embodiment of the present invention will be described.
The embodiment will be described with reference to FIG. FIG. 1 is a longitudinal sectional view showing a configuration of a main part of a bearing device according to a first embodiment of the present invention. In the figure, reference numeral 1 denotes a shaft, and a bearing housing 2 is fitted around the shaft. Dust seals (foreign matter sealing members) 3 made of synthetic rubber or the like are attached to the inner peripheral surfaces of both sides of the bearing box 2, respectively, so that foreign substances such as water vapor, water, and dust do not enter the bearing box 2. It has become.

A bearing (rolling bearing) 4 fitted on the outer peripheral surface of the shaft 1 is accommodated in an inner intermediate portion of the bearing housing 2. The inside of the bearing 4 is filled with a lubricant (grease or the like). Contact type grease seals (lubricant seal members) 5 are respectively attached to both sides of the bearing 4, and the grease seals 5 prevent the grease from leaking out of the bearing 4.

On both sides of the bearing housing 2, void spaces 6 are provided between the dust seal 3 and the grease seal 5, respectively. The interior of these gap chambers 6 is maintained at a pressure higher than the atmospheric pressure (positive pressure with respect to the atmosphere). That is,
A precision regulator 7 and a precision relief regulator 8 are connected to these gap chambers 6 via independent pipes 9 and 10, respectively. The precision regulator 7 supplies air into the gap chamber 6 in order to maintain the gap chamber 6 at a pressure higher than the atmospheric pressure (positive pressure with respect to the atmosphere). The precision relief regulator 8 discharges the air in the space 6 to the outside when the pressure in the space 6 exceeds a certain value.

Next, the operation of the bearing device according to the present embodiment having the above configuration will be described.

The bearing 4 is lubricated by grease filled therein, and the grease does not leak out of the bearing 4 by the contact type grease seal 5. Further, the inside of the gap chamber 6 is always maintained at a constant pressure value equal to or higher than the atmospheric pressure (positive pressure with respect to the atmosphere) by the action of the precision regulator 7 and the precision relief regulator 8.

As described above, by maintaining the air gap chamber 6 that is sealed adjacent to both sides of the bearing 4 at a pressure higher than the atmospheric pressure (positive pressure with respect to the atmosphere), water vapor, water, Foreign matter such as dust can be prevented from entering. Further, even if the outside air is sucked into the bearing 4 due to the decrease in temperature, the air flows into the bearing 4 from the gap chamber 6 maintained at the atmospheric pressure or higher (positive pressure with respect to the atmosphere). Since the internal pressure of the bearing 4 is adjusted by the inflow, it is possible to prevent foreign matters such as water and dust from entering the inside of the bearing 4 from outside the bearing box 2. Further, even if the pressure value in the gap chamber 6 increases due to the temperature rise, the relief regulator 8 operates to discharge air to the outside of the gap chamber 6, so that the pressure inside the gap chamber 6 does not exceed a certain pressure value. Therefore, it is possible to prevent the pressure value in the gap chamber 6 from being larger than the pressure resistance value of the dust seal 3, thereby preventing the dust seal 3 from opening and foreign matter from entering there.

(Second Embodiment) Next, a second embodiment of the present invention will be described.
The embodiment will be described with reference to FIG. FIG. 2 is a longitudinal sectional view showing a main part configuration of a bearing device according to a second embodiment of the present invention. In FIG. 2, the same functional portions as those in FIG. The code is attached.

FIG. 2 differs from FIG. 1 in that a second dust seal (foreign matter sealing member) 11, a second gap chamber 12, and an air operated precision regulator 13 are added to the configuration of FIG. . That is, the second dust seal (foreign matter sealing member) 11 is located outside the first dust seal (foreign matter sealing member) 3 and disposed on both inner peripheral surfaces of the bearing housing 2. The second gap chamber 12 is provided between the first dust seal (foreign matter sealing member) 3 and the second dust seal (foreign matter sealing member) 11. The air operated type precision regulator 13 is connected to the first and second gap chambers 6 and 12 via independent pipes 14 and 15, respectively.

The pressure in the second gap chamber 12 is increased by the operation of the air operated precision regulator 13 to the first space.
Is sensed, and the pressure in the first gap chamber 6 is adjusted and maintained.

As described above, the double positive pressure space chambers 6 and 12 are provided inside the bearing 4, and further, the pressure difference between the first space chamber 6 and the second space chamber 12 is eliminated. The first embodiment described above prevents the intrusion of foreign matters such as water vapor, water, and dust into the bearing 4 by completely eliminating the suction of air from the outside and the discharge of air to the outside through the dust seal 3. Can be performed more robustly than

The other configurations and operations according to this embodiment are the same as those of the above-described first embodiment, and a description thereof will not be repeated.

(Third Embodiment) Next, a third embodiment of the present invention will be described.
The embodiment will be described with reference to FIG. FIG. 3 is a longitudinal sectional view showing a main configuration of a bearing device according to a third embodiment of the present invention. In FIG. 3, the same reference numerals are given to the same functional portions as those in FIG. 2 in the second embodiment described above.

FIG. 3 differs from FIG. 1 in that a grease seal and a dust seal are integrally formed of synthetic rubber. That is, in the present embodiment, the grease seal lip 17 and the dust seal lip 18 are integrally formed on one inner peripheral surface of the seal body 16 and the other inner peripheral surface, respectively.
The space between the lips 17 and 18 is defined as the gap chamber 6.

The bearing 4 is lubricated by the grease filled therein, and the grease does not leak out of the bearing 4 by the grease sealing lips 17, 17. Further, the inside of the gap chamber 6 is always maintained at a constant pressure value equal to or higher than the atmospheric pressure (positive pressure with respect to the atmosphere) by the action of the precision regulator 7 and the precision relief regulator 8.

According to the present embodiment, since the grease seal and the dust seal are integrally formed of synthetic rubber, a new bearing design is not required for the conventional bearing device, and the present invention can be modified with minimum modification. Can be implemented.

The other configuration and operation according to the present embodiment are the same as those of the above-described first embodiment, and the description thereof will be omitted.

(Fourth Embodiment) Next, a fourth embodiment of the present invention will be described.
The embodiment will be described with reference to FIG. FIG. 4 is a longitudinal sectional view showing a main configuration of a bearing device according to a fourth embodiment of the present invention. 4, the same reference numerals are given to the same functional portions as those in FIG. 3 in the third embodiment.

FIG. 4 differs from FIG. 3 in that a grease seal lip 17 is provided on the inner peripheral surface of one side of the seal body 16.
Dust sealing lips 18a, 1 on the inner peripheral surfaces on the middle and other sides
8b are integrally formed, and the grease seal lip 1
7 and the first dust sealing lip 18a are defined as a first void space 6a, and both dust sealing lips 18a, 1
That is, the second space 6b is provided between the spaces 8b and the air-operated precision regulator 19 is provided. The air operated precision regulator 19 is connected to the first and second gap chambers 6a and 6b by independent pipes 20 and 21.

The pressure in the second gap chamber 6 b is increased by the operation of the air-operated precision regulator 19.
Of the first gap chamber 6a is sensed.
The pressure is adjusted and maintained at the same pressure as the pressure in a.

According to the present embodiment, since the grease seal and the dust seal are integrally formed of synthetic rubber, a new bearing design is not required for the conventional bearing device, and the present invention can be implemented with minimal modification. Can be implemented first
Since there is no difference in pressure value between the void space 6a and the second void space 6b, the first dust sealing lip 18a is completely prevented from sucking air from the outside or discharging air to the outside, and The intrusion of foreign matter such as water and dust can be more firmly performed than in the above-described third embodiment.

The other constructions and operations according to the present embodiment are the same as those of the first embodiment described above, and the description thereof will be omitted.

(Fifth Embodiment) Next, a fifth embodiment of the present invention will be described.
The embodiment will be described with reference to FIG. FIG. 5 is a longitudinal sectional view showing a configuration of a main part of a bearing device according to a fifth embodiment of the present invention. 5, the same reference numerals are given to the same functional portions as those in FIG. 3 in the third embodiment.

FIG. 4 differs from FIG. 3 in that the bearing housing 2 having the structure shown in FIG. 3 is of a grease (lubricant) recovery type. That is, a grease supply port 22 communicating with one side surface of the bearing 4 and a grease discharge port 23 communicating with the other side surface of the bearing 4 are provided on the outer peripheral surface of the bearing housing 2. The grease supply port 22 is connected to a grease supply device 25 via a grease supply pipe 24, and the grease discharge port 23 is connected to a grease recovery unit (not shown) via a grease discharge pipe 26.

In the grease recovery method, grease is continuously supplied from the grease supply device 25 to the inside of the bearing 4 via the grease supply pipe 24 and the grease supply port 22, and the same amount of deteriorated grease as the supply amount is supplied. Is discharged from the bearing 4 to a grease collecting portion (not shown) through the grease discharge port 23 and the grease discharge pipe 26, and is used when grease is severely deteriorated.

According to the present embodiment, the bearing housing 2 is of a grease (lubricant) recovery type, so that the grease filled in the bearing 4 is gradually replaced with new grease over time. Foreign matter such as water vapor, water, and dust can be prevented from entering between the lips 17, 18 and the shaft 1.

The other constructions and operations according to the present embodiment are the same as those of the third embodiment described above, and the description thereof will be omitted.

(Sixth Embodiment) Next, a sixth embodiment of the present invention will be described.
The embodiment will be described with reference to FIG. FIG. 6 is a vertical cross-sectional view showing the configuration of a main part of a bearing device according to a sixth embodiment of the present invention. In FIG. 6, the same functional portions as those in FIG. The code is attached.

FIG. 6 differs from FIG. 1 in that the bearing housing 2 having the structure of FIG. 1 is of a grease (lubricant) recovery type. That is, the outer peripheral surface of the bearing housing 2 is provided with a grease supply port 27 communicating with the central upper surface of the bearing 4 and a grease discharge port 28 communicating with the central lower surface of the bearing 4. The grease supply port 27 is connected to a grease supply device 30 via a grease supply pipe 29, and the grease discharge port 28 is connected to a grease recovery unit (not shown) via a grease discharge pipe 31.

The grease recovery method is to continuously supply grease from the grease supply device 30 to the inside of the bearing 4 through the grease supply pipe 29 and the grease supply port 27, and to supply the same amount of deteriorated grease as the supply amount. Is discharged from the bearing 4 to a grease collecting section (not shown) through the grease discharge port 28 and the grease discharge pipe 31, and is used when grease is severely deteriorated.

According to the present embodiment, since the bearing housing 2 is of a grease (lubricant) recovery type, the grease filled in the bearing 4 is gradually replaced with new grease over time. It is possible to prevent foreign matters such as water vapor, water, and dust from entering between the dust seal 3 and the shaft 1 and to save space in the axial direction of the shaft 2.

The other configurations and operations according to the present embodiment are the same as those of the above-described first embodiment, and the description thereof will be omitted.

(Seventh Embodiment) Next, a seventh embodiment of the present invention will be described.
The embodiment will be described with reference to FIG. FIG. 7 is a longitudinal sectional view showing a main part configuration of a bearing device according to a seventh embodiment of the present invention. In FIG. 7, the same functional portions as those in FIG. The code is attached.

FIG. 7 differs from FIG. 1 in that the grease supply pipe 29 and the grease discharge pipe 31 are directly connected to the grease seal 5 of the bearing 4. Then, grease is supplied from a grease supply device (not shown) to the inside of the bearing 4 through the grease supply pipe 29 and the grease seal 5, and the same amount of deteriorated grease as the supply amount is supplied from the bearing 4 to the grease seal 5 and the grease discharge pipe. The grease is discharged to a grease collecting section (not shown) via the base 31 and is used when the grease is severely deteriorated.

According to the present embodiment, the grease supply pipe 2
9 and the grease discharge pipe 31 are directly connected to the grease seal 5 of the bearing 4, so that the grease filled in the bearing 4 is gradually replaced with new grease over time while the dust seal 3 and the shaft 1 are connected. It is possible to prevent foreign matters such as water vapor, water, dust and the like from entering from between the shaft 2 and the shaft 2.
In the axial direction can be realized.

The other constructions and operations according to the present embodiment are the same as those of the first embodiment described above, and the description thereof will be omitted.

[0044]

As described in detail above, according to the bearing device of the present invention, the lubricant sealing member for preventing the lubricant filled in the bearing from leaking to the outside of the bearing, and the foreign matter entering the bearing. By providing a gap chamber maintained at a constant pressure equal to or higher than the atmospheric pressure between a foreign material sealing member and a foreign material sealing member for preventing the intrusion of foreign materials, it is possible to reliably prevent foreign materials such as water vapor, water, and dust from entering from the outside. It has the effect of being able to do so.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a main configuration of a bearing device according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a main configuration of a bearing device according to a second embodiment of the present invention.

FIG. 3 is a longitudinal sectional view showing a main configuration of a bearing device according to a third embodiment of the present invention.

FIG. 4 is a longitudinal sectional view showing a main configuration of a bearing device according to a fourth embodiment of the present invention.

FIG. 5 is a cross-sectional view illustrating a main configuration of a bearing device according to a fifth embodiment of the present invention.

FIG. 6 is a longitudinal sectional view showing a main configuration of a bearing device according to a sixth embodiment of the present invention.

FIG. 7 is a cross-sectional view illustrating a main configuration of a bearing device according to a seventh embodiment of the present invention.

FIG. 8 is a longitudinal sectional view showing a configuration of a main part of a conventional bearing device.

[Explanation of symbols]

 1 shaft 2 bearing box 3 dust seal (seal member) 5 grease seal (seal member) 6 void chamber 6a void chamber 6b void chamber 7 precision regulator 8 precision relief regulator 9 piping 10 piping 11 dust seal (seal member) 12 void chamber 13 air operated Mold precision regulator 14 Piping 15 Piping 16 Seal body 17 Grease seal lip 18 Dust seal lip 18a Dust seal lip 18b Dust seal lip 19 Air operated precision regulator 20 Pipe 21 Pipe 22 Grease (lubricant) supply port 23 Grease (lubricant) ) Discharge port 24 Grease (lubricant) supply pipe 25 Grease (lubricant) supply device 26 Grease (lubricant) discharge pipe 27 Grease (lubricant) supply port 28 Grease (lubricant) discharge port 29 grease (Lubricant) supply pipe 30 Grease (lubricant) supply device 31 Grease (lubricant) discharge pipe

Claims (1)

[Claims] 1. A lubricant seal member attached to a bearing fitted on the outer periphery of a shaft and for preventing a lubricant filled in the bearing from leaking out of the bearing, and a foreign matter entering the bearing. A bearing device having a foreign material seal member for preventing intrusion of air, wherein a gap chamber maintained at atmospheric pressure or higher is provided between the lubricant seal member and the foreign material seal member. .