JP2006316748A - Engine and vibration restraining member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an engine capable of effectively restraining vibration generated on a cover such as a fan cover. <P>SOLUTION: The vibration restraining member 30 is arranged so as to cover the fan cover 20 attached to an engine body 11. The vibration restraining member 30 preferably comprises a cover pressing member 31, and an elastic member 32 arranged on a side to face the fan cover 20 with respect to the cover pressing member 31. The elastic member 32 of the vibration restraining member 30 is abutted to a part in a fan cover 20 wherein the vibration is easily generated, and thus, the vibration restraining efficiency is enhanced. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an engine or the like provided with a cover that can generate vibration during operation.

The engine is provided with various covers. For example, there are a fan cover that covers a fan for cooling the engine body, a chain cover and a belt cover that cover a chain and a belt for driving each part of the engine, and the like.
These covers are made with lower rigidity compared to crankcases, cylinders, and the like where a large force acts for the original purpose of covering fans, chains, belts and the like. In particular, in a general-purpose engine or the like, these covers are not a cast aluminum similar to a crankcase or the like, but are often made of steel press-molded thin plates.
For this reason, when vibration of the engine itself, vibration due to the operation of the fan, or the like is transmitted to the cover, there is a problem that the cover formed of a thin plate material resonates and this causes noise.

  On the other hand, a structure in which the cover is formed of resin and reinforced with a reinforcing material (for example, see Patent Document 1), or a structure in which an elastic seal member is interposed between the edge of the cover and the engine (for example, Patent Document 1). Measures such as 2) have been proposed.

Japanese Utility Model Publication No. 55-140711 JP 2001-12255 A

However, as a general-purpose engine used in various applications, if the fan cover is made of resin, it is needless to say that the durability is inferior to that of steel or the like. Further, in a cover formed of a thin plate material, vibration is likely to occur not at the edge contacting the elastic seal member but at a position away from the edge, so that the elastic seal is formed between the cover edge and the engine. It is difficult to effectively suppress vibration generated in the cover only by interposing a member. In addition, when an elastic seal member is interposed between the edge of the cover and the engine, the elastic seal member is bent by the fastening force of the bolt or the like when the cover is attached to the engine body with a bolt or the like. Part of the force escapes, and the elastic seal member may become loose due to use over a long period of time, which tends to cause the bolt to loosen.
The present invention has been made based on such a technical problem, and an object thereof is to provide an engine or the like that can effectively suppress vibration generated in a cover such as a fan cover.

For this purpose, the engine of the present invention includes an engine main body, a cover that covers a part that is mounted on the engine main body, and a vibration suppression member that abuts on the outer peripheral surface of the cover in order to suppress vibration generated in the cover. It is characterized by providing. By bringing the vibration suppressing member into contact with the outer peripheral surface of the cover, the vibration of the cover can be effectively suppressed. For this reason, it is preferable that the vibration suppressing member is provided so as to abut on the outer peripheral surface of the cover at a portion where vibration is likely to occur in the cover.
Such a vibration suppressing member may include a holding member that holds the cover between the engine body and an elastic member that is provided on the cover-side surface of the holding member and contacts the outer peripheral surface of the cover. it can. The holding member of the vibration suppressing member may be fixed to the engine body with a plurality of legs, preferably three or more legs, from the viewpoint of mounting stability.
In addition, by attaching a rubber belt-like member to the engine body in contact with the outer peripheral surface of the cover, it can be used as a vibration suppressing member.

  In addition, an elastic inclusion can be interposed between the cover and the engine body. Thereby, the cover is sandwiched between the engine main body and the vibration suppressing member, vibration from the engine main body side is suppressed by inclusions, and the vibration of the cover that still occurs can be suppressed by the vibration suppressing member.

  Preferably, the engine body is formed with a groove having a shape corresponding to the outer edge portion of the cover, and the inclusion and the outer edge portion of the cover are fitted into the groove. Accordingly, the cover can be positioned with respect to the engine body, and the vibration suppressing member only needs to press the cover against the engine body side.

The present invention can also be used as a vibration suppressing member that suppresses vibrations that occur due to the operation of the device in the cover attached to the device. The device in this case is not limited to the engine, and any device may be used as long as it has a cover that generates vibration due to the operation of the device.
The vibration suppression member is provided on a leg portion fixed to the device, a frame provided along the outer peripheral surface of the cover in a state where the leg portion is fixed to the device, and a side of the frame facing the outer peripheral surface of the cover. And an elastic member that comes into contact with the outer peripheral surface of the cover in a state where the leg portion is fixed to the device.
By providing such a vibration suppressing member so that the elastic member contacts the outer peripheral surface of the cover, it is possible to effectively suppress vibration generated in the cover due to the operation of the device.
This vibration suppression member may be provided in addition to existing equipment.

  According to the present invention, it is possible to effectively suppress the vibration generated in the cover by providing the vibration suppressing member so as to contact the outer peripheral surface of the cover.

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.
[First embodiment]
FIG. 1 is a diagram for explaining a configuration of a main part of an engine (device) 10 in the present embodiment.
As shown in FIG. 1, a shaft 12 protrudes laterally from the engine body 11. A fan 13 for generating wind for cooling the engine body 11 is mounted on the shaft 12.

A fan cover (cover) 20 that covers the fan 13 is attached to the side surface of the engine body 11. The fan cover 20 has an opening 20a for mounting a recoil starter (not shown) on the shaft 12.
An elastic member (inclusion) 21 made of a rubber-based material or the like is attached to the fan cover 20 at the outer edge on the side facing the engine body 11. On the other hand, as shown in FIGS. 1 and 2, the engine body 11 has a groove 14 formed in a portion corresponding to the outer edge portion of the fan cover 20, and the outer edge portion of the fan cover 20 to which the elastic member 21 is attached. The fan cover 20 is positioned by being fitted in the groove 14.

The engine 10 is configured such that the vibration suppressing member 30 is attached to the engine body 11 so as to cover the fan cover 20.
The vibration suppressing member 30 includes a cover pressing member (holding member, frame) 31 formed of metal or resin, and an elastic member 32 provided on the side facing the fan cover 20 with respect to the cover pressing member 31. It is formed.

  The cover pressing member 31 is formed in an annular shape so as to face the periphery of the opening 20a of the fan cover 20, and has a plurality of leg portions 33 extending toward the engine body 11 side. Then, the cover pressing member 31 is attached and fixed to the engine body 11 by passing through a through-hole 33a formed at the distal end portion of the leg portion 33 and fastening to the attachment base portion 15 provided in the engine body 11 with a bolt 34 or the like. It has come to be. At this time, it is preferable to provide three or more legs 33 in order to ensure stability in the attached state.

  The elastic member 32 is made of a rubber-based material, a sponge-based material, or the like having a predetermined thickness, and is integrated with the cover pressing member 31 with an adhesive or the like. The elastic member 32 is provided so as to contact the outer peripheral surface of the fan cover 20 in a state where the cover pressing member 31 is attached and fixed to the engine body 11. At this time, the elastic member 32 is preferably provided so as to come into contact with a surface of the fan cover 20 where vibration is likely to occur.

As a result, the elastic member 21 is positioned on the engine body 11 side and the elastic member 32 is positioned on the cover pressing member 31 side. Therefore, the fan cover 20 is sandwiched between the engine body 11 and the cover pressing member 31 and is elastic. The members 21 and 32 are in a so-called floating state. Thereby, it can suppress that the fan cover 20 vibrates by the vibration of the engine main body 11, etc. FIG.
Furthermore, the vibration suppressing effect is further enhanced by bringing the elastic member 32 of the vibration suppressing member 30 into contact with a location where vibration is likely to occur in the fan cover 20.
The fan cover 20 is substantially fixed to the engine body 11 by a cover pressing member 31 of the vibration suppressing member 30. Since the cover pressing member 31 does not interpose an elastic member or the like between the mounting portion with respect to the engine main body 11, that is, the mounting base portion 15 of the engine main body 11 and the leg portion 33 of the cover pressing member 31, the fastening with the bolt 34 or the like is ensured. Even in long-term use, it is possible to avoid loosening of the bolts 34 due to the settling of inclusions such as elastic members, and the durability is excellent.

By the way, in the said embodiment, although the cover holding member 31 of the vibration suppression member 30 has a ring-shaped shape surrounding the opening part 20a of the fan cover 20, it is not restricted to this, If it does not interfere with the mounting of components, etc., for example, as shown in FIG. 3, it is possible to form a cover pressing member 31 ′ having a continuous shape and fixing both ends to the engine body 11 as shown in FIG. good. Other than this, as long as the function of abutting the elastic member 32 against the fan cover 20 so as to absorb the vibration of the fan cover 20 while fixing the fan cover 20 to the engine main body 11 can be realized. Also good.
Further, the cover holding member 31 itself is eliminated, the entire vibration suppressing member 30 is formed of a rubber belt, and both ends thereof are fixed to the engine body 11 with metal fittings, so that the fan cover 20 is attached to the engine body 11. It is also possible to adopt a configuration that absorbs vibration of the fan cover 20 while being fixed thereto.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. Here, in the following description, about the structure which is common in said 1st embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.
As shown in FIG. 4, the engine 10 is configured such that a fan cover 20 ′ and a vibration suppressing member 30 are sequentially attached to the engine body 11 ′ (in FIG. 4, the fan 13 is omitted). .
Here, as in the first embodiment, the groove 14 is not formed in the engine body 11 ′, and the fan cover 20 ′ is directly brought into contact with the mounting surface 11a.
On the other hand, the fan cover 20 ′ is provided with an elastic member 21 ′ at the outer edge that contacts the mounting surface 11 a of the engine body 11 ′. The fan cover 20 ′ is formed with a mounting flange portion 25 in which a through hole 25a is formed at a position corresponding to the mounting base portion 15 of the engine body 11 ′.

The fan cover 20 ′ has a bolt 34 passing through the through holes 33 a and 25 a in a state where the mounting flange portion 25 is sandwiched between the mounting base portion 15 of the engine body 11 ′ and the leg portion 33 of the vibration suppressing member 30. By being fastened to the mounting flange portion 25, it is fixed to the engine body 11 '.
In such a configuration, the fan cover 20 ′ is not sandwiched between the elastic members 21 and 32 and held floating as in the first embodiment, but the elastic member 32 of the vibration suppressing member 30 is not attached to the fan cover 20 ′. By bringing the cover 20 'into contact with a place where vibration is likely to occur, a vibration suppressing effect can be ensured. Also in this case, since the cover pressing member 31 and the fan cover 20 ′ do not interpose an elastic member or the like in the attachment portion with respect to the engine body 11 ′, the fastening by the bolt 34 or the like can be performed reliably, and even in long-term use, It is possible to avoid loosening of the bolt 34 due to the settling of inclusions such as an elastic member, and the durability is excellent.

In the above-described embodiment, the example in which the vibration suppressing member 30 is provided to suppress the vibration of the fan covers 20 and 20 ′ has been described. However, the present invention is not limited to this, and the engine body 11 such as a belt cover and an oil pan is used. , 11 ′, the same configuration can be applied to various other things.
Furthermore, not only the engine 10 but also other devices and devices can achieve the same effects as described above by applying the present invention.
In addition to this, as long as it does not depart from the gist of the present invention, the configuration described in the above embodiment can be selected or changed to another configuration as appropriate.

It is a perspective view which shows the structure of the engine in 1st embodiment. It is sectional drawing which shows the attachment structure with respect to an engine main body of a fan cover and a vibration suppression member. It is a figure which shows the other example of a vibration suppression member. It is a perspective view which shows the structure of the engine in 2nd embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Engine (equipment), 11 ... Engine main body, 13 ... Fan, 14 ... Groove, 20 ... Fan cover (cover), 21 ... Elastic member (inclusion), 25 ... Mounting flange part, 30 ... Vibration suppression member, 31 ... cover pressing member (holding member, frame), 32 ... elastic member, 33 ... leg, 34 ... bolt

Claims (6)

The engine body,
A cover that covers parts to be mounted on the engine body;
In order to suppress vibration generated in the cover, a vibration suppressing member that contacts the outer peripheral surface of the cover;
An engine comprising: The vibration suppressing member includes a holding member that holds the cover between the engine body and the holding member,
The engine according to claim 1, further comprising an elastic member provided on a surface of the holding member on the cover side and abutting on an outer peripheral surface of the cover.   The engine according to claim 1, wherein an elastic inclusion is interposed between the cover and the engine body.   The groove of the shape corresponding to the outer edge part of the cover is formed in the engine body, and the outer edge part of the inclusion and the cover is fitted in the groove. Engine.   The engine according to any one of claims 1 to 4, wherein the vibration suppressing member is provided so as to abut on an outer peripheral surface of the cover at a portion where vibration is likely to occur in the cover. A vibration suppressing member that suppresses vibration generated due to the operation of the device in a cover attached to the device,
Legs fixed to the device;
A frame provided along the outer peripheral surface of the cover in a state where the legs are fixed to the device;
An elastic member provided on a side of the frame facing the outer peripheral surface of the cover, and abutting on the outer peripheral surface of the cover in a state where the leg portion is fixed to the device;
A vibration suppressing member comprising:

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