JPH05280693A - Greese valve with release hole - Google Patents

Abstract

PURPOSE:To simplify the preservance and inspection of greese pressure by providing a release hole communicating to a communicating hole such that the release hole is closed in the injection of greese and normally closed while being released to the atmosphere or in the injection of grease and released in the heat generation of a bearing section. CONSTITUTION:A greese valve having a release hole 8 normally released to the atmosphere is composed of a greese injection part 1 for holding a nipple like a check valve, a greese introducing tube 2, a hole 3 communicating to a bearing, a movable tube 4, a movable tube fixing ring 5, a support spring 6, an O-ring 7 and a release hole 8. When a greese gun is pressed against the greese injection part 1 to inject grease, the support spring 6 is pushed down and the movable tube 4 is also pushed down to thereby close the release hole 8 with the movable tube 4. Thus, the injection pressure is held so that the grease can be injected through the communicating hole 3. When the greese gun is removed, the movable tube returns to the original position to release the release hole 8 to the atmosphere so that the grease can be automatically emitted in the rise of temperature or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grease valve, and more particularly to a grease valve with a release hole.

[0002]

80% of rotating machines use grease lubrication to lubricate their bearings. Although the grease lubrication method is inferior in lubrication performance to oil lubrication, it has a great advantage in that the structure around the bearing can be simplified and the machine can be downsized, and maintenance and inspection work of lubrication can be easily performed. And the structure of the grease injection part is often
A grease valve (grease niple) is used.

However, regarding grease lubrication using grease niple, (1) seizure of the bearing due to temperature rise in the bearing housing when grease is overfilled, (2) such temperature rise in the housing occurs. The weak points are the damage to the oil seal due to the rise in the pressure inside the bearing housing due to the grease gas that occurs when the oil leaks, and the resulting leakage of grease.

First, (1) will be described in detail.

When a new bearing is set, an appropriate amount of grease can be injected from the capacity of the bearing housing, so troubles of overfilling are unlikely to occur. However, when filling through the conventional grease valve, the internal condition may not be visible during the additional filling during the subsequent regular maintenance and inspection. Another operator mistakenly thinks that the grease has run out, and additional filling has caused seizure failure of the bearing.

Some machines are provided with a grease remover for these problems, but the ratio is low. In addition, even if the grease is removed, there are many cases where the plug is present, and it cannot function effectively unless it is opened (see Fig. 1).

In the case of a machine in which the temperature is likely to rise without removing the grease, there are cases where the grease valve (see FIG. 2) is not removed after the grease is filled and the grease is left until the temperature of the grease stabilizes.

As described above, the grease lubrication of the bearing is a simple operation, but since it is positioned to be important for the stable operation of the machine, it is a work that imposes a heavy mental burden on the operator in important equipment. ..

Next, the item (2) will be described in detail.

FIG. 2 shows some structures of a conventional grease valve. These grease valves are attached to the mechanical structure above the bearing by, for example, screw fitting, and grease is sent to the bearing through a pipe line (communication hole). As shown in the figure, all these grease valves have a check valve structure, so even if the internal pressure of the bearing housing increases due to the grease gas generated by the temperature rise due to the heat generation of the bearing, it will be sealed. The grease is pushed further into the bearing, the oil seal is damaged, and the grease leaks from the oil seal and the like.

[0011]

SUMMARY OF THE INVENTION An object of the present invention is to provide a grease valve in which the above-mentioned weak points are eliminated.

[0012]

As a result of earnest research to solve the above-mentioned problems, the present inventor has found that the structure of a grease valve having a grease injection port of a check valve structure using niple or the like is changed to a normal atmosphere. There is an open hole or a hole that is released to the atmosphere when the internal pressure of the bearing housing gradually rises due to the generation of grease gas due to the rise in internal temperature due to the heat generation of the bearing, and from the release hole during grease injection. It has been found that the above problems can be solved by using a structure in which the injection pressure does not escape, and the present invention has been completed based on such findings.

That is, the present invention is a grease valve having a grease injection port of a check valve structure and a communication hole between the injection port for guiding the injected grease to the bearing part and the bearing part. It has a release hole that is in contact and is closed during grease injection and is normally open to the atmosphere, or a release hole that is closed during grease injection and normal and is open to the atmosphere when heat is generated in the bearing. The present invention relates to a grease valve with a release hole.

In the grease valve of the present invention, the injection pressure is maintained when the grease is pushed in from the grease injection port, and the internal pressure is increased when the pressure in the bearing housing is increased by the grease gas generated by the temperature rise due to the heat generation of the bearing portion. Can be smoothly removed, and grease can be smoothly overflowed in the case of overfilling, so maintenance and inspection of grease lubrication can be performed very easily.

The present invention will be described in detail below.

A grease valve having a check valve structure of the present invention and a communication hole for introducing the injected grease to a bearing portion and between the injection port and the bearing portion, the grease valve communicating with the communication hole. Those skilled in the art can easily manufacture a grease valve with a release hole that is normally open to the atmosphere or has a release hole that is open to the atmosphere only when heat is generated in the bearing. Some examples of such grease valves are given below.

FIG. 3 (a) shows an example of a grease valve having a release hole that is open to the atmosphere during normal operation, in a vertically cut structure. Reference numeral 1 is a grease injection portion for holding niples as a check valve, 2 is a grease introduction tube, 3 is a communication hole to a bearing, 4 is a moving tube, 5 is a moving tube fixing ring, 6 is a support spring, and 7 is an O ring. , And 8 are open holes which are normally open to the atmosphere. A top view is shown in FIG.

In this grease valve, when the grease gun is strongly pressed against the grease injection portion 1 during grease injection, the support spring 6 is pushed down and the wall surface of the movable cylinder 4 closes the release hole 8 and the injection pressure is increased. Is held, and the grease injected from the grease gun flows into the bearing through the communication hole 3. When the injection operation is finished, the movable cylinder 4 is pushed up by the support spring 6, and the release hole 8 is released to the atmosphere.

When the pressure rises in the bearing housing due to the grease gas generated by the temperature rise due to the heat generation of the bearing portion due to overfilling, etc., it is prevented that the grease gas escapes from the release hole 8 and the oil seal is damaged. To be done. Also, even if the grease is overflowed due to overfilling, it is automatically discharged to the outside.

FIG. 4 shows an example in which the grease valve shown in FIG. 3 is used in a horizontal shape in a longitudinal section. The meanings of the symbols are the same as in FIG.

FIG. 5 shows another example of a grease valve having a release hole that is normally open to the atmosphere in a vertically cut structure. 11 is a grease injection part that holds niples like a check valve, 12 is a grease introduction tube, 13 is a communication hole, 14 is a release hole tube, 15 is a moving ball, 16 is a support spring, and 17 is a normal atmosphere open state Shows the release hole at.

In this grease valve, the support spring 16 contracts due to the pressure when the grease is injected by the grease gun, and the release hole is formed.
17 is closed by the moving ball 15 and the injection pressure is maintained.

Even if the pressure rises in the bearing housing due to the grease gas generated by the temperature rise due to the heat generation of the bearing portion, the rising speed is not rapid, so that the support spring 16 cannot be closed and the grease gas is released through the hole. Can be pulled out from 17.

FIG. 6 (a) shows a longitudinal structure of an example of a grease valve in which the release hole is open to the atmosphere only when heat is generated in the bearing portion. Reference numeral 21 is a grease injection portion for holding the niple like a check valve, 22 is a grease introduction tube, 23 is a communication hole, 24 is a moving tube, 25 is a moving tube fixing ring, 26 is a bias spring, and 27 is O.
A ring, 28 is a shape memory alloy spring, and 29 is an open hole. As the shape memory alloy spring 28, for example, Ni-
A spiral spring made of Ti-based shape memory alloy can be used. A top view is shown in FIG. 6 (b).

It is clear that this grease valve holds the injection pressure. Further, for example, when heat is generated in the bearing portion due to overfilling, this valve is heated up to the grease valve by heat conduction. The position of the moving barrel 24 is automatically changed by the shape memory alloy spring 28 that is deformed by this heat, and the release hole
29 is open to the atmosphere, and the grease gas generated by the heat generation of the bearing is discharged.

FIG. 7A shows another example of the grease valve in which the release hole is open to the atmosphere only when heat is generated in the bearing, which has a longitudinal structure. Reference numeral 31 is a grease injecting portion for holding the niple in a check valve manner, 32 is a grease introducing tube, 33 is a communication hole, 34 is a valve rod for sensing heat, and 35 is an opening hole. The valve stem 34 is
For example, it can be made of a copper-based shape memory alloy.

It is obvious that this grease valve also holds the injection pressure. Further, in this valve, when the heat generation of the bearing portion is sensed, the valve rod 34 is deformed and contracted, the release hole 35 is opened to the atmosphere side, and the grease gas generated by the heat generation of the bearing portion is discharged. In FIG. 7, (b) and (c) show the shapes of the valve rod 34 at low temperature and high temperature, respectively.

In any of the grease valves shown in FIGS. 3 to 7, the grease injecting portions at the tips of the moving cylinders 4 and 24 or the grease introducing cylinders 12 and 32 are screw-fitted with a conventional grease valve as shown in FIG. Of course, it may be formed by.

Although the grease valve with a release hole according to the present invention has been described above with reference to some specific examples, the grease valve with a release hole according to the present invention is not limited to these embodiments, and the grease valve is not limited to these modes. The valve has a check valve structure grease injection port and a communication hole between the injection port for guiding the injection grease to the bearing part and the bearing part, and a state of normal atmospheric release in communication with the communication hole. The grease valve with a release hole of the present invention is within the range as long as it has a release hole or a release hole which is open to the atmosphere only when heat is generated in the bearing portion.

The material of the grease valve with a release hole of the present invention may be the same as that of the conventional grease valve, and for example, brass can be used. There is no special limitation on the size of each part. For example, in the case of the grease valve shown in FIG. 3, the outer diameter is around 25 mm,
The height can be around 50 mm. The manufacturing method can also follow the conventional manufacturing method of the grease valve.

The grease valve with release hole of the present invention is used by being attached to the mechanical structure above the bearing by, for example, screw fitting.

[0032]

A grease valve having a check valve structure and a grease injection hole having a check valve structure and a communication hole for guiding the injected grease to the bearing portion and the bearing portion are provided in the release hole or the bearing portion which is normally open to the atmosphere. By providing a release hole that is in an open state to the atmosphere when heat is generated, the overfilling of grease is prevented or eliminated by overflow from the release hole, and the bearing Since the rise in the pressure inside the bearing housing due to the grease gas generated by the heat generation of the part is released through the release hole, the oil seal is prevented from being damaged, and the grease is prevented from leaking.

[0033]

EXAMPLES The present invention will be further described below with reference to examples.

Example 1 (Production Example) The grease valve shown in FIG. 3 was produced.

That is, a brass round bar was machined for each part and assembled in the same manner as the conventionally known grease niple. The grease valve had an outer diameter of 26 mm and a height of 50 mm.

Example 2 (Example of use) The grease valve with the release hole of Example 1 was used as a large water pump (75k).
(W, 1450 rpm), when the bearing was replaced, the housing was almost completely filled with grease, and when the operation was started under the condition that the conventional grease niple burns out, the grease overflowed from the release hole and the bearing had an initial temperature rise. It did not seize, and reached a steady state after 15 minutes.

Therefore, the grease valve with release hole of the present invention is
It is understood that the grease valve is superior to the conventional grease valve in terms of preventing seizure of the bearing in overfilling and easy maintenance.

[0038]

As described above, according to the present invention, a grease valve is provided which allows maintenance and inspection of grease lubrication of a bearing portion to be performed very easily.

[Brief description of drawings]

FIG. 1 shows a bearing to which an example of a conventional grease valve is attached.

FIG. 2 shows some examples of conventional grease valves using niples as check valves.

FIG. 3 shows an example of a grease valve of the present invention having a release hole that is normally open to the atmosphere.

FIG. 4 shows another example of the grease valve of the present invention having a release hole that is normally open to the atmosphere.

FIG. 5 shows still another example of the grease valve of the present invention having a release hole that is normally open to the atmosphere.

FIG. 6 shows an example of the grease valve of the present invention having a release hole that opens when heat is generated in the bearing portion.

FIG. 7 shows another example of the grease valve of the present invention having a release hole that opens when heat is generated in the bearing portion.

[Explanation of symbols]

 1, 11, 21, 31 Grease injection part 3, 13, 23, 33 Communication hole 8, 17, 29, 35 Release hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kiyoshi Sawaguchi 1-1 Suzuki-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Ajinomoto Co., Inc. Kawasaki Plant

Claims (1)

[Claims] 1. A grease valve having a check valve structure, a grease injection port, and a communication hole for guiding the injection grease to a bearing portion between the injection port and the bearing portion, the grease valve being in communication with the communication hole.
Characterized by having a release hole that is closed during grease injection and is normally open to the atmosphere, or a release hole that is closed during grease injection and normal and that is open to the atmosphere when heat is generated in the bearing Grease valve with release hole.