JPH0535041B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a guide plate for guiding the saw chain of a chain saw used for felling wood, etc., that is, a steel guide plate for a chain saw. It is characterized in that it does not need to be supplied.

[Conventional technology]

As shown in FIG. 6, the chain saw 1 includes a chain saw body 2, a saw chain 3 made of steel that is driven by an internal combustion engine, etc. provided on the chain saw body 2, and a steel guide plate 5 that guides the saw chain 3.
The saw chain 3 is driven along the outer peripheral end surface of the steel guide plate 5.

In addition, in the following description, the "steel guide plate" will be simply referred to as the "guide plate."

Conventionally, the guide plate 5 has been constructed as shown in FIG. That is, the guide plate 5 has side plates 6, 7 and a middle plate 8 integrally formed by adhesion, spot welding, etc., and has a saw chain guide groove 9 on the outer peripheral surface.
was provided, and the saw chain 3 was guided by the saw chain guide groove 9 so that it would not come off.

The conventional guide plate 5 is subjected to heat treatment such as carburizing and induction hardening to impart wear resistance, but since it is used under high pressure due to the tension of the saw chain 3, it is necessary to supply lubricating oil. It was hot.

That is, among the locations where the guide plate 5 and the saw chain 3 come into contact, where the force applied in the normal direction to the contact surface is large, the saw chain 3 of the side plates 6 and 7 receives the force due to the tension of the saw chain 3. The sliding outer peripheral end surfaces 6a, 7a, such end surfaces 6a,
The coefficient of friction between the steel materials in 7a was extremely large, about 0.3. For this reason, lubricating oil is supplied between the saw chain 3 and the guide plate 5, and the side plate 6,
Outer peripheral end surfaces 6a, 7a on which saw chains 3 of No. 7 slide.
Unless lubricating oil is continuously supplied to reduce the coefficient of friction at There was a risk of an accident.

For this reason, the conventional chain saw 1 requires a lubricating oil supply means, such as an oil tank or an oil pump, which makes it impossible to make the chain saw smaller and lighter, and increases costs. However, it has the disadvantage that it requires a lot of effort to replenish the lubricating oil, and it also costs money to purchase the lubricating oil. Furthermore, if the oil pump or the like breaks down, or if the user forgets to replenish the lubricating oil, the above-mentioned serious damage may occur, and there are also problems in terms of reliability and safety.

[Problem that the invention seeks to solve]

The present invention eliminates the above-mentioned drawbacks of the prior art, and eliminates the need to supply lubricating oil, making the chain saw smaller and lighter, reducing costs, eliminating trouble and expense during use, and improving reliability and safety. The purpose of the present invention is to provide a guide plate for a chain saw that makes it possible to improve the performance of the chain saw.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention has a structure in which grooves are provided on the outer peripheral end surface on both sides of the saw chain guide groove on which the saw chain slides, and ceramics are sprayed into the grooves.

[Effect]

In the present invention, as in the prior art, among the parts that come into contact with the saw chain, the places where the force applied in the normal direction to the contact surface is large are the saw chains on both sides of the saw chain guide groove that receive the force due to the tension of the saw chain. This is the outer peripheral end surface that slides. However, according to the present invention, ceramics with high wear resistance and a coefficient of friction with steel material of about 0.2 are located on the end face, so the coefficient of friction of the end face becomes significantly small. Even without supplying lubricating oil, there is almost no wear and heat generation of the guide plate and saw chain. Therefore, according to the present invention, it is not necessary to supply lubricating oil.

Ceramics are generally vulnerable to external impacts, but in the present invention, the ceramics are thermally sprayed into the grooves formed on the outer peripheral end face, so the ceramics are safely protected within the grooves and are protected from damage. There is no risk of receiving such damage.

〔Example〕

The present invention will be described below based on embodiments shown in the drawings.

10 is a guide plate for a saw chain according to an embodiment of the present invention, and in the case of the embodiment shown in the drawing, the side plate 1
1, 12 and a middle plate 13 are integrally formed by bonding, spot welding, etc., and a saw chain guide groove 14 is provided on the outer peripheral surface, and the saw chain 3 is guided by the saw chain guide groove 14 so that it does not come off. . Incidentally, instead of configuring the side plates 11, 12 and the middle plate 13 in one piece, a relatively thick single plate may be used and the saw chain guide groove 14 may be formed on the outer peripheral surface thereof by groove processing. .

In the present invention, the saw chain guide groove 1
A groove 15 is provided on the outer peripheral end surface on which the saw chain 3 slides on both sides of the saw chain 4, and the ceramic 1 is inserted into the groove 15.
6 is thermally sprayed.

In the case of the drawing embodiment, the side plates 11 and 12 as described above
Since the structure uses the middle plate 13,
Both sides of the saw chain guide groove 14 are provided with side plates 11 and 12.
and the outer peripheral end faces 11a, 1 of the side plates 11, 12
A groove 15 is provided in the groove 2a, and a ceramic 16 is thermally sprayed into the groove 15 so as to be slightly raised from the outer peripheral end surfaces 11a and 12a.

The groove 15 has a substantially rectangular cross section in the embodiment shown in FIGS. 1 and 2 and the embodiment shown in FIG. 3, and has a substantially V-shaped cross section in the embodiment shown in FIG. There is. However, the groove 15 is not limited to these shapes, and may have other shapes.

Further, the surfaces forming the grooves 15 are connected at an acute angle part 15a in the embodiment shown in FIG. 3, but in the embodiment shown in FIGS. 1 and 2 and the embodiment shown in FIG. The curved surface 15b is used to prevent the formation of such an acute angle portion 15a, and the surface of the groove 15 is formed smoothly and continuously. Note that the term "acute corner" herein refers to a portion where the connecting portion of the surface forming the groove 15 is not smooth. Therefore, in the embodiments shown in FIGS. 1 and 2 and the embodiment in FIG. 4, the adhesive strength of the ceramics 16 increases compared to the embodiment in FIG. Stress will not be concentrated in one part.

Therefore, from the viewpoint of preventing peeling and damage of the ceramic 16, the surface on which the groove 15 is formed is formed at the acute angle part 1 as in the embodiment shown in FIGS. 1 and 2 and the embodiment shown in FIG.
It is more desirable not to connect at 5a. However, as in the embodiment shown in FIG.
Even if there is, there is almost no problem in practical use.

Also in the present invention having the above configuration, among the parts that come into contact with the saw chain 3, the parts where the force applied in the normal direction to the contact surface is large are the parts of the saw chain 3.
These are the outer peripheral end surfaces 11a, 12a on which the saw chains 3 of the side plates 11, 12 slide, which receive force due to the tension of the side plates 11, 12. However, according to the present invention, since the ceramic 16 is located on the surface of the outer peripheral end surfaces 11a, 12a on which the saw chain 3 slides, the coefficient of friction between the outer peripheral end surfaces 11a, 12a and the saw chain 3 is reduced. 0.2, which is significantly smaller than before, and as a result, even without supplying lubricating oil, wear and heat generation that can actually be a hindrance to the guide plate 10 and the saw chain 3 during normal wood cutting and other operations. is almost non-existent. Therefore, according to the present invention, there is no need to necessarily supply lubricating oil.

Ceramics 16 are generally weak against external impacts, but in the present invention, ceramics 16 are thermally sprayed inside grooves 15.
The ceramics 16 housed in 5 are protected and free from damage. According to the experiment conducted by the inventor of the present invention, the side plate 1 as shown in FIG.
When ceramics are sprayed directly into a flat plate shape without providing grooves on the planes of the outer peripheral end surfaces 11a and 12a of 1 and 12, there is no support surface in the left and right direction, and the ceramics 16 are rubbed by the sliding movement of the saw chain 3. It has been confirmed that it easily peels off and cannot withstand use.

Further, as described above, according to the present invention, there is no need to supply lubricating oil, so the chain saw does not need to be provided with a lubricating oil supply means such as an oil tank or an oil pump, and the chain saw can be made smaller and lighter. It is possible to reduce costs, eliminate trouble and expense during use, and improve reliability and safety.

Note that if lubricating oil is supplied in the same manner as in the past, wear and heat generation of the guide plate 10 and the saw chain 3 can be further reduced even if a small amount is supplied. Furthermore, if the ceramic 16 is impregnated with oil or coated with Teflon, the wear and heat generation of the guide plate 10 and the saw chain 3 can be further reduced.

〔Effect of the invention〕

According to the present invention, since it is not necessary to supply lubricating oil, it is possible to reduce the size and weight of the chain saw, reduce costs, eliminate trouble and expense during use, and improve reliability and safety. It is possible to obtain the desired effect.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a longitudinal sectional view, FIG. 2 is an enlarged view of the main part thereof, and FIG. 3 is a diagram corresponding to FIG. 2 showing another embodiment. , 4th
The figures show still another embodiment and correspond to Fig. 2; Fig. 5 shows an experimental example for carrying out the present invention; Fig. 6 corresponds to Fig. 2; 7 is a front view of a conventional chain saw, and FIG. 7 is a longitudinal sectional view of its guide plate. 10... Saw chain guide plate, 14... Saw chain guide groove, 15... Groove, 16... Ceramics, 15a
...Sharp corner.

Claims (1)

[Scope of Claims] 1. A steel guide plate for a chain saw, characterized in that grooves are formed on the outer circumferential end surface on both sides of the saw chain guide groove on which the saw chain slides, and ceramics are thermally sprayed into the grooves. 2. The steel guide plate for a chain saw according to claim 1, wherein the surface forming the groove is formed smoothly and continuously.