JPS6320822Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cylinder cover that covers the cylinders of an engine.

Generally, in portable engines such as brush cutters, the cylinder cover has one side of the cover body that covers the cylinder connected to the fan cover, and a lid part on the other side.
It was formed on the body. Air from the fan was guided from the fan cover to the cover body, passed around the cylinder, and was released into the atmosphere from the lid. Warm air that has cooled the cylinder and warmed it up causes discomfort when blown onto the worker, so it must always be blown toward the opposite side of the worker, backwards, or downwards. The direction of the guide piece provided on the lid differs depending on whether it is used as a backpack or as a backpack, and it is necessary to manufacture a separate cover body in each case, so an expensive cover body is required. I had to prepare several types.

The present invention reduces inventory costs and manufacturing costs by fixing a separately formed lid to the cover body, and by preparing various inexpensive lids and selecting them as appropriate and fixing them to the cover body. It is an attempt to measure the

Hereinafter, one embodiment of the present invention will be described in detail using the drawings.

In FIGS. 1 to 9, 1 indicates the engine of the brush cutter. 3 is a cylinder, 5 is a crankcase, 7 is a flywheel fixed to the drive shaft 9, 1
A fan 11 is provided on one side, and a centrifugal clutch 13 is provided on the other side. Reference numeral 15 denotes a clutch drum located close to the outside of the centrifugal clutch 13 and fixed to the transmission shaft 17. 19 is a recoil starter, 21 is an ignition plug, and 23 is an electronic ignition device.
A fan cover 25 covers the fan 11 and guides the air generated by the fan 11 toward the cylinder 3. 27 is a carburetor, 29 is a silencer communicating with the carburetor 27, 31 is a muffler cover that covers a muffler (not shown), and 33 is a fuel tank.

Reference numeral 35 denotes a cylinder cover, which is divided into a cover body 37 that covers the cylinder 11 and a lid portion 39. The cover body 37 is divided into a connecting portion 41 that connects to the fan cover 25 and a main body portion 43. The connecting portion 41, the main body 43, and the lid portion 39 are formed separately in advance and are fixed as one body by spot welding. 45 is an electric wire hole through which a high-voltage electric wire 47 communicating with the ignition plug 21 passes; 49 is an ignition plug hole through which the ignition plug 11 passes; 51 is a screw hole for fixing the main body 43 to the cylinder 11 with a screw 53; 55 is a screw hole for fixing the connecting portion 41 to the crankcase 5 with a screw 57.
Reference numeral 59 indicates an exhaust hole opening at the rear of the lid portion 39, and reference numerals 61 and 63 indicate notch holes cut out in the side surface of the main body portion 43 on the carburetor 27 side and the side surface on the muffler cover 31 side, respectively.

In the above embodiment, the air generated by the fan 11 that is rotated by the drive of the engine 1 is guided by the fan cover 25 and the cylinder cover 35, passes around the outer periphery of the cylinder 3, and passes through the outer periphery of the cylinder 3.
Air is exhausted backward from the exhaust hole 59 of 9. When assembling the cylinder cover 35, when using a lid part 67 equipped with a guide piece 65 as shown in FIGS. 10 and 11 in order to exhaust air downward,
This lid part 67, which is manufactured separately in advance, is attached to the main body part 43.
It can be welded by spot welding. Similarly, the 12th
Various types of pre-fabricated lids are available, such as a lid part 71 equipped with a wire mesh 69 as shown in FIGS. Various types of cylinder covers 35 can be assembled by selecting and fixing parts to the main body part 43 as necessary.

Also, depending on the type of work, it may be easier to use a brush cutter with an inverted engine.In this case, the same engine is used inverted, but the exhaust muffler needs to be located on the outside opposite to the worker. Therefore, the mounting sides of the muffler and carburetor are opposite for upright and inverted engines. In addition, the muffler has a large cutout hole to send cooling air, and the carburetor has a small cutout hole to prevent overheating.
The shape of the notch on the muffler side and the carburetor side of the cylinder cover is different. Conventional cylinder covers had a connecting part, main body part, and lid part formed in one piece from the beginning, so it was necessary to prepare cylinder covers with different main parts according to these changes. Combining the changes meant that many types of cylinder covers had to be prepared. As shown in this embodiment, if the connecting part 41, the main body part 43, and the lid part 39 are configured to be formed separately and fixed in advance, various main parts and lid parts can be prepared in advance and selected as appropriate. It is something that can be assembled.

Since the present invention has the configuration as described in claim (1), it can be used in combination with various lid parts as needed, and an inexpensive lid can be used without preparing various expensive entire cylinder covers. Since it is only necessary to prepare various parts, the inventory price is low and the manufacturing cost is low. Also, the plate thickness can be changed depending on the load on each part. Further claims
If the structure is as described in (2), various types of main body parts can be prepared and combined with various types of lid parts, and the inventory price can be further reduced.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can be implemented in other embodiments as well. Further, the symbols shown in the claims do not limit the technical scope of the present invention.

[Brief explanation of the drawing]

Figures 1, 2, and 3 are each a part of the present invention.
Side sectional view, side view, and plan view of the engine equipped with the embodiment, FIGS. 4, 5, 6, 7, and 8
9 are respectively a perspective explanatory view, a rear view, a side sectional view, a top view, a side view, and a rear view of one embodiment of the present invention. FIG. 10 is a side sectional view of a second embodiment, and FIG.
12 is a rear view of the third embodiment, FIG. 13 is a cross-sectional plan view, FIG. 14 is a rear view of the fourth embodiment, and FIG. 15 is a cross-sectional plan view of the fourth embodiment. be. Explanation of the symbols representing the main parts of the drawing, 3...
Cylinder, 25...Fan cover, 37...Cover body, 39...Lid part, 41...Connection part, 43
...Main body.

Claims (1)

[Claims for Utility Model Registration] (1) One side of the cover body 37 covering the cylinder 3 is connected to the fan cover 25, and a separately formed lid part 39 is fixedly provided on the other side.・Cylinder cover. (2) The cover main body 37 is divided into a main body part 43 that covers the cylinder 3 and a connecting part 41 to which the fan cover 25 is connected, and the main body part 43 and the connecting part 41 are formed separately. Cylinder covers set forth in claim (1) for utility model registration that are fixedly attached to each other.