JPS58101252A - Engine member of non-metallic inorganic material - Google Patents

Abstract

PURPOSE:To prevent the fuel leakage and the dropping of the inorganic material while lowering the engine noise, by constructing the engine member such as a block body with non-metallic inorganic material such as concrete or ceramic then forming a thin film layer of resin onto the surface. CONSTITUTION:A block body 26 to which a cylinder body 84 and a cylinder head 86 of an engine 10 are secured through bolts is integrally formed with non- metallic material or concrete where an approximately cylindrical metal casting boss 68 will support a crank shaft 70 through a bearing 80. After the concrete has been dried properly, the block body 26 is demolded to form a thin resin film layer of acryl system or polyester system having low viscosity, heat resistance, low surface tension, durability and excellent sealing performance is formed onto the entire surface. Consequently the sealing performance is improved while the fuel leakage is prevented and the dropping of concrete from the surface is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an engine member made of a non-metallic inorganic material such as concrete or ceramics.

It is being considered to make engine parts such as exhaust silencers and crankcases using non-metallic inorganic materials such as concrete and ceramics, which have excellent sound insulation, heat resistance, and vibration absorption properties. In this case, it is possible not only to significantly reduce engine noise, but also to reduce the number of parts and improve productivity.

However, most non-metallic inorganic materials such as concrete and ceramics are porous and have poor sealing properties, so fuel such as gasoline comes into direct contact with the inorganic materials.

In some cases, this fuel could leak or fall off the surface in the form of fine powder.

Furthermore, porous inorganic materials have poor sealing properties, so if the engine parts are left to stand after being removed from the mold, moisture will evaporate and the engine parts will shrink. This sometimes resulted in poor dimensional accuracy. - This invention was made in view of the above circumstances, and is a non-metallic material that can prevent leakage of fuel, etc., prevent inorganic materials from falling off in the form of fine powder from the surface, and further reduce dimensional deviations. The purpose is to provide engine parts made of inorganic materials.

In order to achieve the above object, the present invention forms a thin resin film layer on the surface of an engine member made of non-metallic and inorganic materials. The present invention will be described in detail below based on the illustrated embodiments.

The drawings show an embodiment in which the present invention is applied to a portable pressure engine engine, in which Fig. 1 is a front view thereof, Fig. 2 is a right side view, 1 Fig. 3 is a sectional view taken along the line ■-■ in Fig. 1, Figure 4 is a front view of the block body in which the crankcase, exhaust muffler, intake chamber, etc. are integrally formed, and Figure 5 is the v-VIi in Figure 1.
l cross-sectional view, Figure 6.7.8 is Vl-Vl in Figure 4.
1 and 9 are sectional views taken along line IX--IX in FIG. 8.

In FIG. 1.2.3, reference numeral 10 is a two-stroke single cylinder engine, 12 is a generator driven by this engine 10, and 14 is a recoil type starter (FIG. 2). This recoil type starter 14 has a third. As shown in the figure, a blower fan 16 is provided, and the cooling air sent out by the blower fan 16 is guided to a cover 18 (FIGS. 1 and 3) to forcibly cool the engine 10. The engine 12 protrudes forward from the engine 10, and has two legs 20 (20as20) at its front end that extend downward as shown in FIG.
b) is fixed.

In FIGS. 1 to 3, 22 is an instrument panel, and 24 is a fuel tank, and this fuel tank 24 contains a mixed oil consisting of gasoline and lubricating oil.

26 is a block body as one of the engine members, and is integrally made of concrete as a non-metallic inorganic material. The block body 26 includes an intake chamber 28, a first expansion chamber 30, a resonance chamber 32, and a second expansion chamber 34 in order from the right side in FIG.
A crank chamber 36 is formed above each of these chambers 28-34. All of these chambers 28 to 36 are open to the front side. Note that the first thing. 2nd expansion chamber 30%3
Lightweight foamed concrete (hereinafter referred to as ALC) layers 37 and 38 are formed on the inner surface of 4. This ALC layer 37.38
has the effect of increasing sound absorption. 39.40 is intake chamber 28
and the first expansion chamber 30, and the first and second expansion chambers 30.
．． 34 and the crank chamber 36, respectively. These air passages 39 and 40 are connected to the block body 2.
6 in the front-rear direction to form a heat insulating air layer.

An intake pipe 42 that protrudes to the right as shown in FIG. 1.4 communicates with the intake chamber 28, and a filter 44 that removes dust from the intake air from the front as shown in FIG. 5 is connected to the intake chamber 28.
is attached, and a cover plate 46 is attached from the front side. This cover plate 46 has an air intake hole 48 opened therein.

A muffler cover material 50 made of a concrete block is attached to the first and second expansion chambers 30, 34 and the resonance chamber 32 from the front. As is clear from FIGS. 1.2.6 to 8, an exhaust pipe 52 that protrudes to the left is embedded in this lid member 50, and the right end of the exhaust pipe 52 communicates with the first expansion chamber 30. (Figure 6).

54 and 56 are exhaust passages formed between the block body 26 and the base of the lid member 50, the exhaust passage 54 communicates with the first and second expansion chambers 30, 34, and the exhaust passage 56 communicates with the exhaust passage 54. The resonance chambers 32 are communicated with each other (No. 4.6.7).
figure).

In Figure 4.8.9, 58.60 is block body 2
The rear end of the exhaust passage 58 is connected to the second Jl tension chamber 34 through a pipe 62, and the exhaust passage 60
- The rear seven ends are open at the back surface of the block body 26.

The front ends of both of these exhaust passages 58 and 60 are connected to the block body 2.
6 and the base of the lid member 50 through a passage 64 formed between them.

Next, the engine 10 will be explained. The crank chamber 36 formed in the block body 26 has a wide opening at the front, as shown in FIG. It has a diameter. Further, a metal substantially cylindrical boss 68 is integrally cast into the block body 26, and this boss 68 supports a crankshaft 70, which will be described later.

In FIG. 3, 70 is a crankshaft, and 72 is a connecting rod. These assemblies are installed into the crank chamber 36 through the opening of the crank chamber 36, and the rear part of the crankshaft 70 is supported pivotally on the boss 68 by a bearing 74. Suru. 76 is a crankcase lid material made of concrete block,
A metal substantially cylindrical boss 78 is integrally cast in the center thereof. This cover member 76 is attached to the opening of the crank chamber 36 from the front side of the block body 26, and at this time, the front portion of the crankshaft 70 is supported on the boss 78 by a bearing 80.

82 is a piston S attached to the upper end of the connecting rod 72
84 is a cylinder body, 86 is a cylinder head,
The cylinder body 84 and the cylinder head 86 are fixed to the block body 26 by means of holes 88 (see FIG. 4) embedded in the block body 26. In FIG. 3, 90 is a scavenging passage, and 92 is a spark plug.

In FIG. 1.3, 100 is a carburetor, and this carburetor 100 is installed in the block body 26.
2 (FIG. 4), it is attached to the block body 26 via a reed valve 104. Further, 104 is a duct connecting the intake pipe 42 and the carburetor 100.

In FIG. 1, reference numeral 108 indicates the exhaust pipe 52 that connects the exhaust gas of the engine 10 to the exhaust pipe 52.
This is the exhaust pipe that leads to the

Next, the operation of this embodiment will be explained. First, the main switch is turned on and the engine 10 is manually started using the recoil starter 14. Intake air passes through the intake hole 48, filter 44, intake chamber 28, intake pipe 42, duct 106, carburetor 100, and reed valve 104, and is drawn into the crank chamber 36 as the piston 82 moves upward. vaporizer 10
The mixture of fuel and intake air created at 0 is prepressurized within the crank chamber 36 as the piston 82 descends, and then enters the combustion chamber through the scavenging passage 90 and is combusted.

The exhaust of the engine io passes through the exhaust pipe 108.52 to the first
It enters the expansion chamber 30 and expands here. The exhaust gas is then throttled through the exhaust passage 54, enters the second expansion chamber 34, and expands again. That is, the exhaust gas interferes with each other while expanding within these expansion chambers 30 and 34, and the exhaust noise is attenuated. Meanwhile, the resonance chamber 32 absorbs the vibration energy of the exhaust gas. The exhaust air is then exhausted through exhaust passages 58,60.

Here, the block body 26, the muffler lid 50, and the crankcase lid 76 will be explained. These are also engine parts made of concrete, which is a non-metallic inorganic material. These engine parts are made by pouring a mixture of cement, aggregate (sand, sand, etc.), and water into a predetermined mold. After the curing engine part has sufficiently increased its strength and dried properly, it is removed from the mold.

After demolding, a thin resin film layer is immediately formed on the entire surface of the engine member. There are various types of resins and methods for forming thin film layers2, and various combinations thereof are also possible.

Various resins such as acrylic, polyester, diallyl phthalate, and silicate resins can be used as the resin, but resins that are excellent in low viscosity, heat resistance, low surface tension, durability, sealability, etc. are preferred.

Methods for forming the thin film layer can be roughly divided into methods of coating by coating, spraying, etc., and methods of impregnation into a porous inorganic material. Impregnation methods include a dipping impregnation method, a vacuum impregnation method, a pressure impregnation method, and various combinations of these methods. The optimal method for forming the thin film layer is selected depending on the resin used.

There are also methods for curing the thin film layer, such as natural leaving, hot air drying, hot water immersion, pressure heating, etc., and the most suitable curing method is selected depending on the resin used.

In this embodiment, since the thin film layer is formed immediately after the engine member is demolded, the water contained in the engine member hardly changes thereafter. Therefore, after demolding, there is almost no shrinkage due to evaporation of water, and it is possible to prevent changes in dimensional accuracy over time or changes in the use environment, especially changes in humidity.

In the above embodiments, since concrete was used as the non-metallic inorganic material, it is not only easy to manufacture by simply pouring concrete into a mold and hardening it, but also the material is inexpensive. However, it goes without saying that this invention may use materials other than concrete, such as ceramics.

As described above, in this invention, a thin resin film layer is formed on the surface of an engine member made of a non-metallic inorganic material, so that sealing performance is improved and leakage of fuel etc. can be reliably prevented. In addition, non-metallic inorganic materials will not fall off the surface, and the mechanical strength of the engine components themselves will improve.

Furthermore, since the content of moisture in engine parts remains unchanged after the thin film layer is formed, the engine parts do not shrink or expand due to changes in this content, and this eliminates changes in dimensional accuracy over time and changes in the environment, especially humidity. Dimensional changes are less likely to occur.

[Brief explanation of drawings]

Fig. 1 is a front view showing one embodiment of the present invention, Fig. 2 is a right side view, Fig. 3 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 4 is a front view of the block main body. Figure 5 is a sectional view taken along line v-v in Figure 1, and Figures 6 to d are VI in Figure 4.
-Vl line sectional view, ■--■ line sectional view, ■--■ line sectional view, and FIG. 9 is an IX-IX line sectional view in FIG. 26...Block body as an engine member, 50.
... Silencer cover material as an engine member, 76... Crankcase cover material as an engine member. Patent Applicant Yamaha Motor Co., Ltd. Agent Patent Attorney Yama 1) Text of Written Amendment J7. F3 Kato8 Patent Office Commissioner Shima 1) Haru Judono 1, Indication of the case 1989 patent @ No. 199043 2, Title of invention Engine member made of non-metallic inorganic material 3, Relationship with the amended person case Patent Applicant 71 Gana 25-00 Shingai, Iwata City, Shizuoka Prefecture Address 8 (8*) (A07) Yamaha Motor Co., Ltd. Representative Hisao Koike 4 Agent Address: 105 Phone: 03 (,591) 75
565 Date of amendment order Voluntary 6
Number of inventions that can be increased by amendment 〇As shown in the attached sheet. (Attachment) 8. Contents of the amendment (1) On page 4, line 10 of the specification, the phrase "lightweight foamed concrete" is amended to read "lightweight foamed concrete IJ-)J, which is a type of lightweight porous material." Q) In the same book, page 12, line 12, "39.40 is" should be corrected to "Instead of ALC, the layer may be formed of various lightweight porous materials. 39.40 is."'(3) Ibid. No. 7
On the 12th line of the page, 1'-104J is corrected to rl'06J. (4) Correct Figure 1 as marked in red on the attached sheet. (5) Correct Figure 3.6.8 as attached. Above Figure 5-334- Figure 6

Claims (1)

[Claims] An engine member made of non-metallic and inorganic material, characterized by having a thin resin film layer formed on its surface.