JPS5839881A - Shaft sealing device - Google Patents

Abstract

PURPOSE:To prevent sealing material from the influence of freezing or surge pressure by providing rings to be separated from bearings and the sealing material. CONSTITUTION:An input shaft 4 and a driven shaft 5 are supported in a case 2 via bearings 3 and 3' to be rotatable, and gears 6 and 7 are fast fixed on these shafts 4 and 5. Meanwhile, oil seals 8 are provided inside bearings 3 and 3', and an oil seal 9 is provided outside the bearing 3. Gaps between oil seals 8 and 9 and bearings 3 and 3' are respectively filled with grease. Both shafts 4 and 5 are equipped with rings 10 and 11 to be separated from bearings 3 and 3' and oil seals 8 and 9. Consequently, the water to enter the case 2 is perfectly intercepted by the ring 11, and the pressure oil caused to flow in from side ends of gears 6 and 7 by the generation of surge pressure is perfectly intercepted by a ring 10.

Description

[Detailed description of the invention] The present invention relates to a shaft sealing device.

Conventionally, in gear pumps and vane pumps for refueling mounted on tanker trucks, etc., lightning and moisture that adhere to the exposed part of the shaft in cold weather freezes and melts, and when refueling is interrupted, the flow path is blocked and surges occur. Pressure was generated, which had an adverse effect on the sealing material. Specifically, Fig. 1 shows a gear pump @1, and the input shaft 02 exposed to the outside.
is supported by a bearing 04 inside a case 03, and oil seals 05 and 06 are installed on the inside and outside of the bearing 04. ◇In cold weather, lightning and moisture S attached to the input shaft 02 can reach the oil seal 06. When it infiltrates and freezes, the oil seal 06 hardens and breaks (as oil seals are generally made of rubber), resulting in the leakage of lubricants such as grease filled in the bearing 0 part. Seizure occurs in bearing 04.

In addition, when the pump is being driven to refuel, if the flow path is shut off with a cock or the like to interrupt refueling, pressure will be generated within the closed flow path, and this will also occur inside pump 01. As shown by the 1st W4 arrow, the pressure oil reaches the oil seal 05, but since the pressure resistance of oil seals is generally low, it is damaged and ends.

The bearing 04 seizes due to leakage of lubricant such as grease.

The present invention solves the above-mentioned drawbacks, and an embodiment thereof will be described below with reference to FIG. 2. 1 is a gear pump (the same applies to a vane pump) mounted on a tank truck, and bearings 3 and 3' are installed in a case 2. An input shaft 4 and a driven shaft 5 are rotatably supported through the shaft, and gears 6 and 7 are fixed to both shafts 4 and 5, and an oil seal 8 is installed inside the bearings 3 and 3).
is installed, and an oil seal 9 is also installed on the outside of the bearing 3, and each oil seal 8, 9 and the bearing 3, 3)
The space between them is filled with grease. In addition, the two wheels 4.5 are located at positions separated from the bearings 3, 3' and the oil seals 8, 9.
That is, a ring 10 is attached to the inside of the oil seal 8, and a ring 11 is attached to the outside of the oil seal 9. The rings 10 and 11 are made of synthetic resin such as Teyan resin, and a material with high pressure resistance and weather resistance is selected. Although the ring 10, 11 shown in FIG. 2 is directly attached, it is also possible to use a pad, a taa, or a printer in combination. Further, although the ring 10 is mounted on the shaft 4.5 at a spaced position inside the oil seal 8, it may be mounted so as to be in sliding contact with the side end surface of the gear 6.6.

Next, to explain the operation of the present invention, the tank row 9
Even if water such as rainwater or muddy water adhering to the input shaft 4 tries to enter the case 2 while the car is running, it is completely blocked by the ring 11 □ On the other hand, when refueling is performed while driving the ring 1, When the flow path is interrupted and the flow path is blocked with a cock or the like, surge pressure is generated in the closed flow path and inside the pump 1, but the pressure oil flowing in from the side end surfaces of the gears 6 and 7 is completely blocked by the ring 10. .

As described above, in the present invention, since the ring is mounted at a position separated from the sealing material such as a bearing or an oil seal, the effect of freezing or the generation of pressure does not affect the sealing material, and the shaft sealing device such as a pump can be used. Can be maintained in good condition.

[Brief explanation of the drawing]

Figure 1 is a partial sectional view showing a conventional example, and Figure 2 is a longitudinal sectional view of the present invention. 6.6'...Bearing, 8.9...Oil seal (
sealing material), io, 1i...ring.

Claims (1)

[Claims] 1. A shaft sealing device in which a sealing material is mounted on the inside or outside of a bearing, characterized in that a ring is mounted at a position separated from the bearing and the sealing material.