JPH0710436U - 2-cycle engine - Google Patents

Abstract

(57) [Summary] [Purpose] When a small general-purpose two-cycle engine used for a brush cutter or the like comes into contact with a fan that rotates inside when a part of the worker's body, especially a finger, enters from the cooling air inlet. The present invention relates to a structure intended to avoid danger. [Structure] A crankcase 2 supporting a crankshaft and having a cooling air inlet 4 to a cooling fan attached to the crankshaft, and a fuel tank 3 provided along the crankcase 2. In the two-cycle engine including the above, the protrusion 6 extending along the peripheral edge portion 5 of the cooling air suction port 4 is integrally formed on the fuel tank 3, and thus the operator's fingers or the like can cool the cooling air suction port. It is designed so as to prevent entry into 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention avoids danger in a small general-purpose two-cycle engine used for a brush cutter, etc., when a part of the operator's body, especially fingers enters from the cooling air inlet and touches a fan rotating inside. It relates to a structure intended to do.

[0002]

[Prior art]

 Conventionally, the following structures have been proposed for the above purpose. That is, a grid is provided integrally with the crankcase at the cooling air suction port of the crankcase. Attach a cover such as a steel plate or a lattice made of synthetic resin to the cooling air inlet of the crankcase.

[0003]

[Problems to be solved by the device]

 As described above, when the grid is provided integrally with the crankcase, the grid is necessarily provided near the cooling air suction port, which results in resistance to the cooling air suction and further for manufacturing the crankcase. The mold becomes complicated and the durability of the mold is impaired.

Further, when using a cover with separate parts as described above, there is the inconvenience that although the shape can be arbitrarily selected, the cost is high and maintenance such as cleaning the inside requires time and effort.

[0005]

[Means for Solving the Problems]

 Here, the present invention is directed to a crankcase supporting a crankshaft and forming a cooling air suction port to a cooling fan attached to the crankshaft, and a fuel tank installed along the crankcase. In a two-cycle engine equipped with, a protrusion that extends along the peripheral edge of the cooling air intake port is integrally formed with the fuel tank, so that the operator's fingers and the like enter the cooling air intake port. It proposes a two-cycle engine designed to prevent this.

[0006]

[Action]

 In the two-cycle engine configured as described above, the outside air sucked by the cooling fan from the cooling air suction port in which the fingers and the like are prevented from entering by the protrusions cools the electronic parts of the engine. At the same time, it flows between the cooling fan of the cylinder of the engine and the cylinder cover to cool the engine.

[0007]

【Example】

 FIG. 2 shows an example of a compact general-purpose two-cycle engine, where 1 is an engine body, 2 is a crankcase, and 3 is a fuel tank. FIG. 3, which is an enlarged view of a part thereof, shows a crankcase 2 in which a crankshaft is axially supported, and a cooling air suction port 4 to a cooling fan attached to the crankshaft is formed. A fuel tank 3 is provided along the crankcase 2.

As shown in the figure, the cooling air suction port 4 is actually relatively wide and is curved and long so as to follow the shape of the side surface of the crankcase 2. There is a risk of injuring the crankcase 2 when it enters the crankcase 2 through the cooling air suction port 4 due to contact with the internally rotating cooling fan.

Therefore, in the present invention, as shown in FIG. 1, it is proposed that a part of the fuel tank 3 is integrally formed with a protrusion 6 extending along the peripheral edge 5 of the cooling air inlet 4. It is a sipping thing. Since a small-sized general-purpose two-cycle engine fuel tank that is generally used in a working machine for agricultural work is a plastic molded product, there is no technical difficulty in forming the protrusion 6 as described above.

Due to the presence of the protrusion 6, it is possible to prevent the operator's fingers and the like from entering the crankcase 2 from the cooling air inlet 4, and to use the engine of the present invention for mowing work and the like. When used, foreign matter such as cut grass can be prevented from entering the crankcase 2 through the cooling air inlet 4.

[0011]

[Effect of device]

 According to the present invention, the protrusion is simply integrated with the fuel tank without giving the crankcase having the cooling air suction port a complicated shape or requiring special parts such as the cover. By molding, it is possible to avoid the risk of the operator's fingers and the like entering the crankcase from the cooling air suction port, and therefore safety can be very simply and inexpensively secured. is there.

[Submission date] August 25, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

[0006]

[Action]

In the two-cycle engine configured as described above, the outside air sucked by the cooling fan from the cooling air suction port in which the fingers and the like are prevented from entering by the protrusions cools the electronic parts of the engine. together, it is intended to cool the engine flows between the cooling off Lee Nshi Linda cover of the engine cylinders.

[Brief description of drawings]

FIG. 1 is a side view of an essential part showing an embodiment of the present invention.

FIG. 2 is a perspective view of a general small-sized general-purpose two-cycle engine.

FIG. 3 is a side view showing a general structure to which the present invention is not applied.

[Explanation of symbols]

 2 Crank case 3 Fuel tank 4 Cooling air suction port 5 Edge 6 Protrusion

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[Procedure amendment]

[Submission date] August 25, 1993

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

Claims (1)

[Scope of utility model registration request] 1. A crankcase for supporting a crankshaft and having a cooling air suction port for a cooling fan attached to the crankshaft, and a fuel tank provided along the crankcase. In the two-cycle engine, the protrusion extending along the peripheral edge of the cooling air intake port is integrally formed with the fuel tank, and thus the operator's fingers and the like are prevented from entering the cooling air intake port. A two-cycle engine that you can do.