JPH0356052A - Shaft sealing device for gear device - Google Patents

Abstract

PURPOSE:To check oil leakage by installing a pair of oil seals in a housing, forming space and filling this space with grease. CONSTITUTION:The inside of a gear box 11 is filled with lubricant, and a pair of oil seals 4a and 4b are installed with a collar 6 between inside a housing 11 provided in a gear box 11. A bearing 10 lies outside of it, and a shaft 2 is set in its inside diameter such that it rotates. The housing 11a of the gear box 11 is provided with a grease nipple 7 and an oil drain plug 8, and when grease is injected through the grease nipple 7, the grease fills the space 9 between the oil seals 4a and 4b, passing through the hole provided at a collar. Accordingly, the oil leakage is checked by the wall of the grease without fluidity.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a shaft sealing device for a gear device.

[Conventional technology]

FIG. 4 is a cross-sectional view showing the main parts of a conventional example, in which a gear train consisting of a plurality of gears, some of which are not shown, is installed in a gear box 1 filled with lubricating oil 3, and a bearing lO is mounted on the housing 1a. A rotating shaft 2 supported by a gear 40 and having a fixed gear 40 passes through the shaft and is sealed with an oil seal 4.

[Problem to be solved by the invention]

In the conventional technology described above, it is not expected that the oil seal 4 will completely eliminate oil leakage of the lubricating oil 3, so it is difficult to use this gear device in applications where oil leakage is extremely averse, such as food processing machines. There is a problem with this.

An object of the present invention is to provide a shaft sealing device for a gear device that can effectively prevent lubricating oil sealed in a gear box from leaking from a penetrating portion of a rotating shaft.

[Means to solve the problem]

The shaft sealing device for a gear device of the present invention is such that a housing is formed in a gearbox equipped with a gear train and filled with lubricating oil, and a rotating shaft supported by a bearing passes through the housing, and a pair of oil seals are installed in the housing. This creates a space and fills this space with grease.

[Effect]

Even if fluid lubricating oil tries to leak from the inside of the pair of oil seals into the space formed by the pair of oil seals, it cannot easily enter because it is filled with grease 7. Also, even if it penetrates little by little while mixing with the grease, such grease has a much higher viscosity than lubricating oil, so the amount leaking from the outer oil seal will be larger than that of fluid lubricating oil as in the conventional case. This is much less than the amount leaking from the oil seal. In other words, a wall of non-flowing grease is provided between the free-flowing refined oil and the outside air.

〔Example〕

FIG. 1 is a sectional view showing the main parts of Embodiment 1, FIG. 2 is a sectional view showing the main parts of Embodiment 2, and FIG. 3 is a sectional view showing the main parts of Embodiment 3. illustration is omitted. Components having the same reference numerals as those in the conventional example and each embodiment have approximately the same functions.

In FIG. 1, there is lubricating oil 3 inside the gear box 11.
A pair of oil seals 4a and 4b are installed in a housing lla provided in the gear box 11 with a collar 6 in between. There is a bearing 10 on the outside, and a shaft 2 is fitted into the inner diameter of the bearing 10 so that it can rotate.

The housing lla of the GABOSOX 1l is provided with a grease nipple 7 and an oil drain plug 8. When grease is injected from the grease nipple 7, the grease passes through the hole provided in the collar 6 and enters the space 9 between the oil seals 4a and 4b. 5 is full.

FIG. 2 shows a second embodiment, which differs from FIG. 1 in that the bearing 10 is located closest to the inside of the gearbox lla.

FIG. 3 shows Embodiment 3, which differs from FIG. 1 in that only one oil seal 4a is used and a sealed bearing 30 is used instead.

In both embodiments, the mixing ratio of lubricating oil mixed in the grease 5 removed by removing the oil drain plug 8 during periodic inspection is checked, and an appropriate grease replenishment period is set to prevent oil leakage in advance. .

〔Effect of the invention〕

The shaft sealing device for a gear device according to the present invention is a gearbox equipped with a gear train and filled with lubricating oil, in which a housing is formed and a rotating shaft supported by a bearing passes through the gearbox, and a pair of oil seals are provided in the housing. Since the lubricating oil sealed in the gearbox is fluid and the lubricating oil sealed in the gearbox is replaced by the non-fluid grease that is filled in the space between the pair of oil seals. This wall has the effect of preventing oil leakage, and by extracting the grease and detecting the amount of mixed lubricating oil, it is possible to know in advance when lubricating oil is likely to leak.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the main parts of Example 1, FIG. 2 is a cross-sectional view showing the main parts of Example 2, FIG. 3 is a cross-sectional view showing the main parts of Example 3, and FIG. is a sectional view showing the main parts of a conventional example. 1.11... Gear box, la, lla... Housing, 2... Rotating shaft, 3... Lubricating oil, 4.4a.
4b...Oil seal, 5...Grease, 9...
Space, 10.30...Bearing, 40...Gear. Figure l Figure 11 Figure 2

Claims (1)

[Scope of Claims] 1) A gear box equipped with a gear train and filled with lubricating oil has a housing formed therein to allow a rotating shaft supported by a bearing to pass through the gear box, wherein a pair of oil seals are mounted on the housing. A shaft sealing device for a gear device, characterized in that a space is formed and the space is filled with grease.