JPS6323647Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a mechanical seal, and more specifically, to an improvement of a floating seal type mechanical seal used as an external seal for truck crawlers, etc. of civil engineering and construction vehicles. .

[Conventional technology]

Conventionally, mechanical seals used in truck crawlers of construction machines include those shown in FIGS.

That is, in the figure, 1 is a non-rotating arm, 2 is a non-rotating arm,
is a housing formed on the arm 1; 3 is a rotating roller; 4 is a bearing interposed between the roller 3 and the arm 1;
A non-rotating side floating sheet 5 is fitted and fixed to the inner peripheral stepped portion 2' of the housing 2 through a rubber packing 6a, and is formed on the roller 3 so as to face the inner peripheral stepped portion 2' of the housing 2. A rotating side floating sheet 7 is fitted and fixed to the inner circumferential stepped portion 3' via a rubber packing 6b, and the floating sheets 5 and 7 are pressed against each other by the packings 6a and 6b, respectively. They slide closely together, and the sliding surfaces 5' and 7' prevent fluids such as oil sealed inside the machine from leaking. Further, reference numeral 8 denotes an annular clamping tool having a substantially U-shaped cross section, which includes sliding ends 5'' of both floating sheets 5 and 7,
7'', and prevents the relative displacement of both floating sheets 5, 7, etc., and the two sliding ends 5'', It is holding 7″.

[Problem that the invention attempts to solve]

However, although the clamping tool 8 has the role of assembling the non-rotating side floating sheet 5 and the rotating side floating sheet 7 at the outer circumferential sides of both sliding ends 5'' and 7'', the flange portion 8
a, 8b are not structured to have a sealing function, so the flanges 8a, 8b and both sliding ends 5'',
Muddy water and foreign matter easily enter through the small gap A between the floating sheets 5 and 7'', and this causes rust to occur on the sliding surfaces 5' and 7' of both floating sheets 5 and 7.
Alternatively, they have had problems such as abnormal wear.

In addition, since the clamping tool 8 is attached to the outer periphery of both sliding ends 5'' and 7'' with almost no play, it is possible to slide both floating sheets 5 and 7.
There is also a problem in that the clamping tool 8 is easily destroyed if a relatively large force is applied that causes the clamping tool 8 to become relatively eccentric and separated.

This invention was devised in order to solve the above-mentioned conventional problems, and protects the sliding surface by providing the clamp with a sealing function and a structure that is not easily destroyed. The purpose is to provide a mechanical seal with excellent durability.

[Means for solving problems]

In order to achieve the above object, the mechanical seal of the present invention collectively clamps both the sliding ends of the non-rotating side floating sheet and the rotating side floating sheet that slide closely together, and at least the outer periphery of the sliding end. A ring-shaped clamping tool having a substantially C-shaped cross section is attached to the cap so as to separate and cover the neighboring parts,
It is constructed by sealing grease or the like in a sealed space formed between the clamping tool and the sliding end.

[Effect]

According to the above configuration, both inner circumferential ends of the clamping tool that collectively clamps the sliding ends of both floating sheets slide closely or closely against each sliding end like a lip seal. Therefore, this part prevents muddy water and foreign matter from entering the sliding surface, and grease, etc. sealed in the space between the clamping tool and both sliding ends prevents generation of water and foreign matter from entering the sliding surface. Prevents rust and provides lubrication.

In addition, the inner wall of the clamping tool is spaced apart from the sliding ends through a space filled with grease or the like, in other words, there is "play" between the sliding ends. Even if a force is applied to the floating sheet to cause it to become relatively eccentric and separate, it will not be easily destroyed.

〔Example〕

Next, a preferred embodiment of the mechanical seal of the present invention will be described with reference to the drawings.

Fig. 1 is a sectional view showing how it is attached to a truck roller of a construction machine, and Fig. 2 is an enlarged sectional view of the mechanical seal of this embodiment.
Components having the same configuration as those of the conventional example shown in FIG. 4 and FIG. 4 are designated by the same reference numerals. That is, 1 is a non-rotating arm, 2 is a housing, 3 is a roller, and 4
5 is a bearing, 5 is a floating seat on the non-rotating side, 6a and 6b are packings, and 7 is a floating seat on the rotating side.Both floating seats 5 and 7 slide closely against each other and their sliding surfaces 5',
A fluid seal is provided at 7'. Also 9
is an abbreviated cross-section that collectively clamps the respective sliding ends 5'' and 7'' of both the floating sheets 5 and 7, and also separates and covers the vicinity of the outer periphery of both the sliding ends 5'' and 7''. It is a C-shaped annular clamp and is attached to both the sliding ends 5'', 7'', and the lips 9a, 9b formed on the inner circumferential ends are attached to the sliding ends 5''. ，
7'', and the sealed space formed between the clamping tool 9 and both sliding ends 5'' and 7'' is filled with grease. Muddy water and foreign matter enter between the housing 2 and the roller 3, but the muddy water and foreign matter are trapped on the sliding surfaces 5', 7' of the floating sheets 5, 7. The intrusion into is prevented by the lips 9a, 9b,
Furthermore, since the sliding surfaces 5' and 7' are always protected by the grease G, corrosion such as rusting and abnormal wear are prevented. Furthermore, since the clamping tool 9 is mounted so as to enclose the space in which the grease G is sealed, it is easily destroyed even if a force that causes the floating sheets 5 and 7 to be eccentric and separated from each other is applied. There is no chance that it will happen. Furthermore, the sliding surfaces 5' and 7' are exposed to outside air and corroded during the period before the mechanical seal is installed on the equipment and during the period when the mechanical seal is left unused after installation until the mechanical seal is put into operation. This can also be prevented.

[Effect of idea]

As described in detail above, the mechanical seal of the present invention is used as an external seal for civil engineering and construction vehicles, and is designed to seal the sliding ends of both floating sheets that slide against each other. By attaching an annular clamping tool with a substantially C-shaped cross section to the part and filling the sealed space formed by the capping with grease, etc., it is possible to prevent muddy water, foreign matter, etc. from entering the sliding surface. , and has the effect of preventing the sliding surface from coming into direct contact with the outside air, and in addition, even if force such as relative eccentricity is applied due to the sliding of both floating sheets, the clamping tool can be easily held. Since the structure is unbreakable, it is possible to protect the sliding surface for a long period of time, prevent corrosion, abnormal wear, etc., and prolong the sealing performance. It is extremely large.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a preferred embodiment of the mechanical seal of the present invention in an installed state, FIG. 2 is an enlarged sectional view showing the same embodiment, and FIG. 3 is a sectional view showing a conventional mechanical seal in an installed state. FIG. 4 is an enlarged sectional view showing the conventional example. 2... Housing, 3... Roller, 5, 7...
Floating sheet, 5', 7'...sliding surface,
5″, 7″…Sliding end, 9…Holder, 9a, 9
b...lip, G...grease.

Claims (1)

[Scope of utility model registration request] In a mechanical seal in which a non-rotating side floating seat fixed to a non-rotating member and a rotating side floating seat fixed to a rotating member slide closely against each other on their opposing end surfaces to prevent leakage of internal oil, etc. , a ring-shaped clamping tool having a substantially C-shaped cross section is attached to clamp the sliding ends of both floating sheets together and to cover at least a portion near the outer periphery of the sliding ends;
A mechanical seal characterized in that grease or the like is sealed in a sealed space formed between the clamping tool and the sliding end.