JPH0585196A - Anti-vibration device for single cylinder vertical engine - Google Patents

Abstract

(57) [Abstract] [Purpose] A vibration isolation device for a single-cylinder vertical engine that prevents swinging of the engine head when starting or stopping the engine and suppresses fine engine vibration. [Structure] The anti-vibration rubber 1 is made of a rubber member having a low elastic coefficient, and the fine vibration of the engine E is absorbed by the soft anti-vibration rubber 1. In addition, the flexible support member 3 is attached to the single-cylinder engine E.
Is attached to the crankshaft 4 in a direction orthogonal to the lateral direction of the engine E, and the weight cone member 6 is supported near the tip 5 of the support member 3, so that the head of the engine E is rubber-stabilized when the engine is started. When trying to swing to the left or right with 1 as the fulcrum,
The heavy pyramid member 6 swings through the support member 3 in the direction opposite to the swinging motion, and suppresses the swinging motion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolation device for a single-cylinder vertical engine, and when the engine is started or stopped, or at low speed rotation, the engine is mainly supported on the lower left and right by a vibration isolation rubber as a fulcrum. The thing which can prevent swinging well is provided.

[0002]

2. Description of the Related Art Generally, an operating engine has a vertical center of gravity due to a vertical movement of a piston and a connecting rod and an inertial force caused by a connecting rod swinging to the left and right of a crankshaft. Appears as vibration. The smaller the number of cylinders, that is, the larger the opening angle between the connecting rods, the intermittently the force acting in the vertical direction and the force in the lateral direction act, and the lower the engine speed, the more intermittent it becomes. Since the influence of the force that acts on the engine becomes large, vibration is suppressed by using a vibration-proof rubber in a single-cylinder engine.

The present invention is directed to a vibration isolation device for a single-cylinder vertical engine, and its basic structure is as shown in FIG. 1 or FIG. It is of a type that is mounted on the base 2 via the above.

In the above single-cylinder vertical engine E, when the engine is started or stopped, there is a strong swinging phenomenon in which the head of the cylinder head of the engine E swings to the left or right around the vibration-proof rubber 1 as a fulcrum. Conventionally, as shown in FIG. 3, a soft vibration-proof rubber is replaced with a hard member 1 having a large elastic coefficient to prevent swinging.

[0005]

In the above-mentioned prior art, since the antivibration rubber 1 is made hard, fine vibrations other than swinging are easily propagated to the base 2 (that is, the vehicle body) side, and the operator feels uncomfortable. I often remember. Further, the propagation of the vibration sound of the engine E is promoted, and the soundproof effect is reduced. An object of the present invention is to satisfactorily prevent swinging of the head while suppressing fine vibration of the engine.

[0006]

Means for achieving the above object will be described below with reference to the drawings illustrating an embodiment. That is, according to the present invention, in the vibration isolator of the single-cylinder vertical engine having the basic structure, the flexible support member 3 is oriented to the single-cylinder engine E in a direction orthogonal to the crankshaft 4 in the lateral direction of the engine E. The vibration-damping rubber 1 is made of a rubber member having a low elastic coefficient, while supporting the weight cone member 6 near the tip 5 of the support member 3 and attaching it. The lateral support of the support member 3 is not limited to the horizontal support,
This also includes the case where the horizontal component in the supporting direction is large.

[0007]

Since the vibration isolating rubber 1 is made of a rubber member having a low elastic coefficient, the fine vibration of the engine E can be absorbed by the soft vibration isolating rubber 1. When the head of the engine E tries to swing to the left or right with the anti-vibration rubber 1 as a fulcrum when the single-cylinder vertical engine E is started or stopped, the weight cone member 6 causes the flexible support member 3 to rotate. The engine E swings in a direction opposite to the swinging direction of the engine E to suppress this swinging.

[0008]

The vibration isolating rubber having a low elastic coefficient can absorb fine vibrations of the engine, and the pyramid member swings through the flexible supporting member when the engine is started or stopped, or when the engine is rotated at a low speed. Thus, swinging of the engine head can be suppressed well.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic explanatory view of a vibration isolation device for a single cylinder vertical engine, and FIG. 2 is a schematic perspective view of the engine.

As shown in FIG. 1, a bracket 7 is supported below the single cylinder vertical engine E, and the bracket 7
Is fixed to the base 2 via the anti-vibration rubber 1, and the single cylinder engine E is mounted on the base 2. The anti-vibration rubber 1 is formed of a soft rubber member having a low elastic coefficient so as to be capable of absorbing the fine vibration of the engine E in the left-right direction or the vertical direction. A flexible support member 3 is fixed to one of the brackets 7 projecting from the single cylinder engine E, and a heavy pyramid member, that is, a damper 6 is supported on the tip portion 5 of the support member 3. The support member 3 is an elastic material such as a spiral spring having a tightly packed pitch, or a leaf spring. As shown in FIG. 2, the support member 3 has a non-intersecting orthogonal shape with the axis 8 of the crankshaft 4, and , Oriented horizontally and mounted on the engine E. However, the mounting direction 10 of the support member 3 may be appropriately inclined from the horizontal direction as long as the horizontal component is sufficient as shown by the phantom line P or the broken line Q in FIG.

Therefore, the function of the vibration isolator of this embodiment will be described. Since the vibration isolator 1 is made of a soft rubber material, minute vibrations of the engine E can be absorbed by the antivibration rubber 1.
Further, when the single-cylinder vertical engine E is started, stopped, or rotated at a low speed, the anti-vibration rubber 1 with the head of the engine E at the bottom is provided.
When trying to swing to the left or right with the fulcrum as the fulcrum, the damper 6 swings through the flexible member 3 in the direction opposite to the swinging direction of the engine E, and the swinging force of the engine itself is swung backward. Since it is attenuated by the force, the swing of the engine E can be suppressed. Actually, in the swinging prevention work, it is necessary to adjust the length of the supporting member 4 in accordance with the swinging frequencies of various single-cylinder engines E. It is convenient to configure so that the displacement can be fixed along.
The weight of the damper 6 is appropriately selected according to the weight of the engine body.

[Brief description of drawings]

FIG. 1 is a schematic explanatory diagram of a vibration isolation device for a single-cylinder vertical engine.

FIG. 2 is a schematic perspective view of the engine.

FIG. 3 is a view equivalent to FIG. 1 showing a conventional technique.

[Explanation of symbols]

 E Single-cylinder vertical engine 1 Anti-vibration rubber 2 Base 3 Flexible support member 4 Crankshaft 5 3 near tip of tip 6 Frustum member

Claims (1)

[Claims] 1. An anti-vibration device for a single-cylinder vertical engine in which a lower portion of the single-cylinder vertical engine (E) is mounted on a base (2) through a vibration-isolating rubber (1), wherein the single-cylinder engine (E) ), A flexible support member (3) is attached to the crankshaft (4) in a direction orthogonal to the lateral direction of the engine (E), and a weight cone member is attached to the end portion (5) of the support member (3).
An anti-vibration device for a single-cylinder vertical engine, which supports (6) and comprises the anti-vibration rubber (1) made of a rubber member having a low elastic coefficient.