JP3732036B2 - Anti-vibration structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vibration proof structure, and more particularly to a vibration proof structure that reduces vibration transmitted from a vibration member.
[0002]
[Prior art]
Conventionally, an anti-vibration structure as shown in FIG. 5 is known (Japanese Patent Laid-Open No. 10-266867). In FIG. 5, an anti-vibration rubber 11 is interposed between the power source 3 and the human body contact portion 6. A hollow cylindrical spacer 19 is disposed so as to penetrate the vibration isolating rubber 11 and the human body contact portion 6. One end of the spacer 19 is in contact with the power source 3. At the other end of the spacer 19, a flat flange 19a is formed to extend, and serves as a seat guard.
A bolt 15 is inserted from the other end side of the spacer 19, and the tip of the bolt 15 is screwed to a female screw 18 provided in the power source 3.
[0003]
[Problems to be solved by the invention]
By the way, in the conventional anti-vibration structure, since the anti-vibration rubber 11 is disposed only on one side of the power source 3, the anti-vibration effect may be weak accordingly.
Further, the vibration of the power source 3 may be transmitted to the human body contact portion 6 through the bolt 15 and the spacer 19 which is a hard member.
[0004]
Furthermore, since the anti-vibration rubber 11 is sandwiched in series between the power source 3 and the human body contact portion 6 and fastened by the bolts 15, the degree of freedom of vibration dissipation other than the fastening direction is small. For this reason, the omnidirectional vibration-proofing effect generated from the power source 3 may be thin.
[0005]
The present invention has been made in view of such a conventional problem, and an object thereof is to provide a vibration isolation structure that reduces vibration transmitted from a vibration member.
[0006]
[Means for Solving the Problems]
Therefore, the present invention (Claim 1) includes the vibration member (23), the first elastic member (25) having one end surface fixed or screwed to the vibration member (23), and the first elastic member. The other end surface of (25) is brought into contact with the other end surface and the vibration transmission member (29) in which the through hole (31) is opened, and the through hole (31) of the vibration transmission member (29) is inserted, One end is brought into contact with the other end surface of the first elastic member (25) or a stop provided around the through hole (31) on the one end surface side of the vibration transmission member (29), and the other end is A hollow collar (33) projecting a predetermined length from the other end surface of the vibration transmission member (29), and penetrated through the collar (33), one end surface of which is the other end surface of the vibration transmission member (29). The second elastic member (39) in contact with the first elastic member (25) protrudes from the other end surface, and the through hole (31) and a hanging rod (21) penetrating the collar (33), and the other end surface of the second elastic member (39) and / or the collar (33) guided by the hanging rod (21). ), And the through hole (31) is a long hole, and the collar (33) is swingable in the through hole (31). It is characterized in that the direction of the long hole coincides with the direction of vibration to be reduced .
[0007]
One end face of the first elastic member (25) is fixed or screwed to the vibration member (23). The vibration transmission member (29) has one end surface in contact with the other end surface of the first elastic member (25) and has a through hole (31).
[0008]
The collar (33) is hollow. The collar (33) is inserted into the through hole (31) of the vibration transmission member (29), and one end is in contact with the other end surface of the first elastic member (25). However, one end of the collar (33) may be stopped at a stop portion provided inside the through hole (31) on the one end face side of the vibration transmission member (29).
[0009]
The other end of the collar (33) protrudes from the other end surface of the vibration transmitting member (29) by a predetermined length. The second elastic member (39) is penetrated by the collar (33), and one end surface thereof is in contact with the other end surface of the vibration transmitting member (29).
[0010]
The hanging rod (21) protrudes from the other end surface of the first elastic member (25) and penetrates the through hole (31) and the collar (33). The fastening and fixing means (37) is guided by the hanging rod (21) and fastens and fixes the other end surface of the second elastic member (39) and / or the other end of the collar (33). Here, when only the other end of the collar (33) is fastened and fixed, the thickness of the second elastic member (39) is projected from the other end surface of the vibration transmitting member (29) of the collar (33). It is desirable to match the length.
[0012]
A second elastic member (39) is interposed between the other end face of the vibration transmission member (29) and the fastening means (37). For this reason, the amount of vibration transmitted directly from the fastening and fixing means (37) is reduced. And since the vibration transmission member (29) is sandwiched between the first elastic member (25) and the second elastic member (39) from both sides, both vibrations on the positive side and the negative side are obtained when the vibration is compared to a sine wave. Can be absorbed efficiently.
As described above, a structure in which vibration is hardly transmitted from the vibration member (23) side to the vibration transmission member (29) side can be obtained.
[0014]
The through hole (31) is a long hole, and the direction of the long hole is made to coincide with the direction of vibration to be reduced. The collar (33) can swing in the through hole (31). The reason for the long hole is to secure the function of tightening and fixing by the tightening and fixing means (37) by keeping the width of the long hole narrow.
[0015]
For example, when the long hole is arranged in the vertical direction, the hanging rod (21) can swing in the vertical direction by the vibration in the vertical direction transmitted from the vibrating member (23). Since this swing is transmitted to the second elastic member (39), it is efficiently absorbed by the second elastic member (39).
[0016]
Further, according to the present invention (Claim 2 ), the first elastic member (25) curves from the one end surface and the other end surface of the first elastic member (25) toward the axial center. It is characterized by gradually reducing the diameter.
[0017]
The first elastic member (25) is formed such that its diameter gradually decreases in a curved shape from the one end surface and the other end surface of the first elastic member (25) toward the center in the axial direction. It is desirable that the squeezing method is uniform. Due to this depression, the vibration transmitted through the first elastic member is dissipated or reflected in the free direction by the open end (25a) facing the air in a curved shape. Therefore, the amount of vibration transmitted through the first elastic member (25) is small.
As described above, the curved recess is provided in the first elastic member (25) and the through hole (31) is a long hole, so that the vibration transmitted from the vibration member (23) is omnidirectional. Can be absorbed efficiently. For this reason, the anti-vibration effect is high.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. The block diagram of embodiment of this invention is shown in FIG.1 and FIG.2. FIG. 1 is a side view of an embodiment of the present invention, and FIG. 2 is a front view of the embodiment of the present invention. In FIG. 1, a rigid plate 27a is fixed to the right end of the vibration isolating rubber 25 corresponding to the first elastic member, and a rigid plate 27b is fixed to the left end. A hanging rod 41 projecting to the right side of the rigid plate 27a and screwed with a male screw is screwed to the fan case 23 corresponding to the vibration member, and the rigid plate 27a is in contact with the fan case 23.
[0019]
On the other hand, on the left side of the rigid plate 27b, a hanging rod 21 threaded with a male screw protrudes, and the rigid plate 27b is in contact with the right side surface of the backpack frame 29 corresponding to the vibration transmission member.
The anti-vibration rubber 25 is formed by gradually curving the diameter gradually in a curved shape from the right end and the left end of the anti-vibration rubber 25 toward the center in the axial direction.
[0020]
The back frame 29 has a through hole 31 that is long in the vertical direction. The hanging rod 21 passes through the through hole 31. A hollow cylindrical collar 33 is inserted between the hanging rod 21 and the through hole 31. One end of the collar 33 is in contact with the rigid plate 27b. However, although not shown, a stop portion may be provided inside the through hole 31 to stop one end of the collar 33. The stop portion may be formed by projecting the inside of the through hole 31, or a plate in which a circular opening having a diameter narrower than the opening of the through hole 31 is arranged on the right side surface of the backpack frame 29. May be fixed.
[0021]
The other end of the collar 33 protrudes from the left side surface of the backpack frame 29 by a predetermined length. A bolt 37 is disposed on the other end of the collar 33 via a flat collar 35. The flat collar 35 and the bolt 37 correspond to a fastening means. A hollow anti-vibration rubber plate 39 corresponding to a second elastic member is interposed between the flat seat 35 and the back frame 29.
[0022]
Next, the operation of the embodiment of the present invention will be described.
The anti-vibration rubber 25 is disposed on the right side surface of the back frame 29 and the anti-vibration rubber plate 39 is disposed on the left side surface, and are fastened by bolts 37. In other words, the vibration isolating rubber 25 and the vibration isolating rubber plate 39 contribute to the direction of suppressing the vibration with respect to both the positive side vibration and the negative side vibration in the direction indicated by the e direction in FIG. . For this reason, vibration generated on the fan case 23 side is not easily transmitted to the backpack frame 29.
[0023]
An anti-vibration rubber plate 39 is disposed between the back frame 29 and the flat seat 35. If the thickness of the anti-vibration rubber plate 39 matches the length projected by the collar 33, the manufacture is simple. However, in the non-compressed state, it is also possible to dispose the vibration-proof rubber plate 39 thicker than the protruding length of the collar 33. In this case, the bolt 37 needs to be fastened to such an extent that the vibration-proof rubber plate 39 remains elastic after compression. The flat collar 35 is brought into contact with the other end of the collar 33.
[0024]
Further, by arranging the through-hole 31 that is long in the vertical direction in the back frame 29, it is possible to swing in the direction f perpendicular to the fastening direction as shown in FIG. 1, and to reduce the vibration in the f direction. is there. Since the width of the through hole 31 is narrow, there is no hindrance to the fastening by the flat-plate glasses 35 and the bolts 37. In the present embodiment, in order to suppress vibration in the vertical direction f, the direction of the long hole is set to the vertical direction f. In this way, the main vibration can be efficiently absorbed by opening the direction of the long hole with respect to the vibration direction to be reduced.
[0025]
By forming a curved recess in the vibration isolating rubber 25, the vibration transmitted through the vibration isolating rubber 25 collides with the open end 25a facing the air in a curvilinear manner. Vibration is dissipated or reflected in the free direction by the open end 25a. Accordingly, the amount of vibration transmitted through the vibration isolating rubber 25 is reduced.
As described above, a structure in which vibration is hardly transmitted to the backpack frame 29 from the fan case 23 side can be obtained.
[0026]
Next, application examples of the present invention will be described.
FIG. 3 shows a side view of an engine blower to which the present invention is applied. FIG. 4 shows a rear view of the engine blower. In FIG. 3, the blower 53 is rotationally driven by the engine 51. The blower 53 is accommodated in the fan case 23. The wind generated by the blower 53 is discharged from the hose 55 and used for cleaning fallen leaves and the like.
[0027]
The back frame 29 is formed in an L shape, and the engine 51 and the blower 53 are mounted and fixed on the bottom surface of the back frame 29. A backrest member 57 such as vinyl is disposed on the backrest portion of the back frame 29. A back band 59 is attached between the top 29a of the back frame 29 and the bottom front part 29b. A pair of anti-vibration rubber 25 and anti-vibration rubber plate 39 according to an embodiment of the present invention are disposed between the fan case 23 and the back frame 29 on the left and right.
[0028]
This makes it difficult for vibration generated in the engine 51 and the blower 53 to be transmitted from the fan case 23 to the backpack frame 29. For this reason, the vibration given to an operator can be suppressed small.
[0029]
【The invention's effect】
According to the present invention described above, than because they sandwiched do with the first elastic member from both sides to be the vibration transmission member (29) (25) a second elastic member (39), the vibrating member (23) The amount of vibration transmitted to the vibration transmission member (29) is reduced.
[0030]
Moreover, since the through hole (31) is a long hole and the direction of the long hole is made to coincide with the direction of vibration to be reduced, the suspended rod (21) can swing in the direction of the long hole by vibration, and the vibration is It is efficiently absorbed by the second elastic member (39).
[Brief description of the drawings]
FIG. 1 is a side view of an embodiment of the present invention. FIG. 2 is a front view of an embodiment of the present invention. FIG. 3 is a side view of an engine blower to which the present invention is applied. Rear view [Fig. 5] Example of conventional anti-vibration structure [Explanation of symbols]
21, 41 Hanging rod 23 Fan case 25 Anti-vibration rubber 29 Back frame 31 Through hole 33 Collar 37 Bolt 39 Anti-vibration rubber plate

Claims (2)

A vibrating member (23);
A first elastic member (25) having one end surface fixed or screwed to the vibration member (23);
A vibration transmission member (29) in which one end surface is brought into contact with the other end surface of the first elastic member (25) and a through hole (31) is opened;
The vibration transmission member (29) is inserted into the through hole (31), one end is in contact with the other end surface of the first elastic member (25), and the other end is the vibration transmission member (29). A hollow collar (33) projecting a predetermined length from the other end surface;
A second elastic member (39) penetrating the collar (33) and having one end surface in contact with the other end surface of the vibration transmitting member (29);
A hanging rod (21) protruding from the other end surface of the first elastic member (25) and penetrating the through hole (31) and the collar (33);
Tightening fixing means (37) guided by the hanging rod (21) and tightening and fixing the other end surface of the second elastic member (39) and / or the other end of the collar (33), The through hole (31) is a long hole, and the collar (33) is swingable in the through hole (31), and the direction of the long hole is matched with the direction of vibration to be reduced. Shaking structure.   The first elastic member (25) has a diameter gradually reduced from the one end surface and the other end surface of the first elastic member (25) toward the axial center. The vibration-proof structure according to claim 1.

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