JP2004060696A - Vibration damping device for handlebar - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration damping device for a handlebar, to be mounted on the vibrating handlebar of a mowing machine for effectively damping the vibration down to a satisfactory feeling level. <P>SOLUTION: The vibration damping device comprises rigid housings 32, 42 to be displaced integrally with the vibrating handlebar 20, mass members 36, 46 provided freely movable relative to the housing 32, 42 in the vibrating direction for colliding with the housings 32, 42 during vibration, gaps formed between each of the housings 32, 42 and each of the mass members 36, 46 for allowing the free movement of the mass members 36, 46 in the vibrating direction, and elastic bodies 38, 48 formed on abutting faces between each of the housings 32, 42 and each of the mass members 36, 46. It is mounted on the handlebar 20 for suppressing the vibration of the handlebar 20. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vibration damping device for a handle mounted on a vibrating handle to suppress vibration.
[0002]
Problems to be solved by the prior art and the invention
2. Description of the Related Art Conventionally, a portable farming / construction machine equipped with a driving device such as an engine or a motor such as a mower such as a lawn mower, a hedge trimmer, a pruning machine, a lawnmower, a chain saw, a rock drill, a power tool, or a bicycle or a motorcycle. In such cases, it has been regarded as a problem that the handle is vibrated and transmitted to the hand to cause vibrational disturbance, such as causing leprosy.
Therefore, for example, in a brush cutter, measures have been taken such as forming the grip portion with rubber or sandwiching rubber between the handle and the shaft. However, a satisfactory effect in terms of vibration countermeasures has not been obtained.
[0003]
Therefore, in this type of brush cutter, various means for suppressing vibration of the handle have been proposed.
For example, in Japanese Patent Publication No. 6-611752, while a vibration-absorbing rod having a curved portion is fixed to a shaft of a brush cutter at a base portion, a spring material is interposed between a tip portion and the shaft, and vibration of a handle is reduced. There have been proposals for suppressing transmission.
However, the structure proposed in Japanese Patent Publication No. 6-611752 complicates the structure around the shaft and does not provide a sufficiently satisfactory effect in terms of preventing vibration of the handle.
As described above, the brush cutter is taken as an example, but in reality, there has not been provided any one that provides a sufficient vibration damping action for a vibrating handle in a chain saw or the like.
[0004]
[Means for Solving the Problems]
The handle vibration damping device of the present invention has been devised to solve such a problem.
According to the first aspect of the present invention, there is provided a rigid contact portion which is displaced integrally with a vibrating handle, a mass member provided in a free state in the vibration direction with respect to the corresponding portion, and colliding with the relevant portion when vibrating. It has a gap formed between the corresponding portion and the mass member, for allowing the mass member to float in the vibration direction, and an elastic body formed on at least one of the contact surfaces of the contact portion and the mass member. It is characterized by the following.
[0005]
According to a second aspect of the present invention, in the first aspect, the vibration damping device is of an external type having the mass member outside the handle.
[0006]
According to a third aspect, in the first or second aspect, the vibration damping device has a rigid housing having an idle chamber therein, and the housing constitutes the contact portion. The mass member is accommodated in a floating state in the floating chamber.
[0007]
According to a fourth aspect of the present invention, in the third aspect, the housing is formed separately from the handle, and is fixed to the handle by a fixing means such as a press fit or a screw.
[0008]
According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the vibration damping device is mounted on the handle at a position on the distal end side of a grip.
[0009]
According to a sixth aspect of the present invention, in any one of the first to fourth aspects, the vibration damping device is mounted on the handle at a position closer to a root of the handle than a grip.
[0010]
According to a seventh aspect, in the state according to any one of the first to fourth aspects, the vibration damping device is attached to the handle at a lateral position of the grip in a state where a grip space into which a hand can be inserted is formed between the damper and the grip. It is characterized by having been done.
[0011]
According to an eighth aspect of the present invention, in the seventh aspect, the vibration damping device has a rigid housing, the housing constitutes the contact portion, and the mass member is in a floating state in a floating chamber in the housing. And a fixed arm extends laterally from the housing, and a distal end portion of the fixed arm forms a grip space into which a hand can be inserted between the housing and the grip. It is characterized by being fixed to a handle.
[0012]
According to a ninth aspect of the present invention, in any one of the first to eighth aspects, the handle is a portable agricultural or industrial machine with a driving device.
[0013]
[Action and effect of the invention]
As described above, the present invention provides a rigid contact portion that is integrally displaced with a vibrating handle, a mass member provided in a floating state in the vibration direction with respect to the contact portion, a gap formed therebetween, A vibration damping device having an elastic body interposed between a mass member and a contact portion is mounted on a handle to suppress vibration of the handle.
[0014]
This damping device works as follows.
That is, in the case of this vibration damping device, when the handle starts to vibrate, the contact portion is displaced integrally therewith, and starts to vibrate in synchronization with the vibrating portion.
On the other hand, since the mass member is in a floating state in the vibration direction with respect to the contact portion, that is, freely moves in the same direction independently of the contact portion, it collides with the contact portion when the contact portion vibrates, and It acts to cancel the vibration, that is, the vibration of the handle.
[0015]
At this time, the mass member colliding with the hit portion is given kinetic energy in the opposite direction from the hit portion (accordingly, a part of the vibration energy of the hit portion is absorbed as the kinetic energy of the mass member), and the mass member moves in the opposite direction. Exercise.
Then, it again collides with the contact surface opposite to the first contact surface, and acts again to cancel the contact portion, that is, the vibration of the handle.
[0016]
After that, the mass member repeats the same motion in the opposite phase or a different phase from the hit portion to absorb the vibration energy of the hit portion at each collision and convert it into its own kinetic energy to vibrate. Keep hitting the department. By this energy absorption, the vibration energy of the steering wheel is attenuated, and the vibration is effectively suppressed.
[0017]
If both the contact portion and the mass member are made of a rigid body, a loud noise (collision sound) is generated at the time of collision.
However, in the vibration damping device according to the present invention, since an elastic body such as rubber or resin is formed on at least one of the contact surfaces of the contact portion and the mass member, there is no problem that a loud noise is generated at the time of collision, Vibration energy is converted and absorbed into heat by the sliding wear at the time and the viscous behavior of the elastic body, that is, the vibration damping action of the elastic body works to promote the vibration damping of the vibrating part.
[0018]
It is also conceivable to attach a dynamic damper to the vibrating handle to suppress the handle vibration.
This dynamic damper adds a damper mass to a vibrating portion via a spring. The natural frequency of an additional vibration system including the damper mass and the spring is determined by the natural frequency of the main vibration system (the natural frequency of the vibrating portion). By tuning to (), the resonance magnification of the vibrating part can be reduced and vibration can be suppressed.
[0019]
However, the vibration damping by the dynamic damper only exerts an effect on vibration of a single resonance frequency, and cannot effectively prevent resonance of another frequency. That is, it is not effective for resonance at a plurality of frequencies.
Moreover, in the case of the dynamic damper, there is a problem that another resonance is newly generated before and after the resonance point.
In addition, when a rubber elastic body is used as a spring, the spring constant of the rubber elastic body changes with temperature, so that the temperature dependence of the vibration damping characteristics is high, and the vibration damping efficiency decreases at high or low temperatures.
[0020]
Further, the dynamic damper requires a large mass as the damper mass (about 10% of the mass of the vibrating member), which increases the weight of the entire device, the required installation space, and the direction in which vibration can be suppressed. And there are various problems that they do not work effectively against vibrations in multiple directions.
[0021]
However, in the vibration damping device of the present invention, the mass member is provided so as to be independently movable, and the mass member is moved in the opposite phase or a different phase from the vibration portion of the handle to be damped, so that the mass member collides with the hit portion, and Since it absorbs and attenuates energy, there is no particular frequency dependence, vibration can be suppressed over a wide frequency range, and it is easy and simple to take collision directions in multiple directions. Vibration can be suppressed, and temperature dependency is small, and a good vibration damping effect is exhibited in a wide temperature range from high temperature to low temperature.
The mass required for the mass member is light (only about 5% of the mass of the vibration member is enough), the space required for the entire device is small and compact, and it can be easily mounted on the vibration part. have.
[0022]
FIG. 1A schematically shows an embodiment of the vibration damping device according to the present invention in comparison with a dynamic damper. In the drawing, reference numeral 1 denotes the vibration damping device, and reference numeral 2 denotes a dynamic damper. .
Reference numeral 3 denotes a mass member in the vibration damping device 1, 4 denotes an elastic body formed on the outer peripheral surface of the mass member 3, that is, a contact surface, 5 denotes a housing forming a contact portion, and 6 denotes a damper mass in the dynamic damper 2. , 7 indicate a spring (rubber), and 8 indicates a vibration member.
[0023]
FIG. 1B shows the vibration damping effect when the vibration damping device 1 is mounted on the vibration member 8 in comparison with the case where the dynamic damper 2 is mounted and the case where they are not mounted.
However, in FIG. 1B, c shows a case where the vibration damping device 1 is mounted, b shows a case where the dynamic damper 2 is mounted, and a shows a case where neither of them is mounted.
[0024]
As can be seen from the vibration damping characteristics shown in FIG. 1B, when the dynamic damper 2 shown in FIGS. 1A and 1B is mounted, resonance is suppressed in a specific frequency region (here, a region on the high frequency side). Although it is possible, another new resonance is generated before and after the resonance point, and there is no effect on the resonance on the lower frequency side, but the vibration damping device 1 of FIGS. In this case, the effect is exhibited on both the high frequency side and the low frequency side, and the phenomenon that another new resonance occurs before and after the resonance point does not occur.
As is clear from the above, it can be seen that the handle vibration can be satisfactorily suppressed by attaching the vibration damping device of the present invention to the vibrating handle.
[0025]
In the present invention, the rigid contact portion can be made of a metal such as iron or aluminum alloy, a hard resin, or another hard material.
The mass member itself can be formed of an elastic body such as rubber or resin. However, in this case, it is desirable to form a high specific gravity rubber, a high specific gravity resin, or the like in which metal powder or the like is mixed therein.
When the mass member is formed of an elastic body such as rubber or resin, the mass member itself forms an elastic body such as rubber or resin formed on at least one contact surface between the rigid contact portion and the mass member. It is possible to configure.
[0026]
The mass member may be formed as an elastic foam such as rubber or resin.
However, for more effective vibration suppression, it is desirable that the mass member be made of a metal such as iron, aluminum alloy, or lead.
In that case, an elastic body such as rubber or resin is formed on at least one of the contact surfaces of the rigid contact portion and the mass member.
[0027]
In the present invention, the gap has an important meaning in causing the mass member to most effectively collide with the contact portion. In this sense, the gap is preferably formed in a range of 0.05 to 2.0 mm. Desirably, it is in the range of 0.2 to 1.0 mm.
[0028]
In the present invention, rubber and resin can be used as the elastic body.
Here, as the rubber, for example, various rubbers such as diene rubbers such as NR, SBR and BR, EPDM rubbers, urethane rubbers and silicone rubbers can be used.
As the resin, for example, a thermoplastic resin such as polypropylene or polyamide, a polyolefin, urethane, a polyester-based thermoplastic elastomer or the like can be used.
[0029]
Here, the elastic body may be bonded and fixed to the contact surface of the mass member or the contact portion by vulcanization or the like, or may be formed on the contact surface in a non-adhered state.
[0030]
The vibration damping device of the present invention can be of an external type in which a mass member is located outside the handle (claim 2).
By using such an external type of vibration damping device, the vibration damping device can be easily mounted on the current steering wheel, and thus the vibration of the current steering wheel can be easily reduced to a level that can be satisfied with the bodily sensation. Become like
[0031]
In the present invention, it is also possible to provide the vibration damping device with a rigid housing, form a contact portion with the housing, and accommodate the mass member in a floating state in the floating chamber in the housing ( Claim 3).
[0032]
In this case, the housing can be formed separately from the handle, and the housing can be fixed to the handle by fixing means such as press-fitting or screws (claim 4).
By doing so, the vibration damping device can be more easily attached to the handle.
[0033]
The vibration damping device of the present invention can be mounted on the distal end side of the handle grip (claim 5), or can be mounted on the base side of the handle grip (claim 6).
By doing so, the transmission of vibration from the vibration source to the hand holding the grip can be effectively suppressed.
[0034]
In the present invention, the vibration damping device can be mounted at a lateral position of the grip in a state where a grip space into which the hand can be inserted is formed between the grip and the handle (claim 7).
Even in this case, the transmission of vibration to the grip can be suppressed at a position immediately adjacent to the grip, and the transmission of vibration from the handle to the hand can be effectively suppressed.
[0035]
In this case, the vibration damping device has a rigid housing, thereby forming a contact portion. The mass member is accommodated in the housing in a floating state, and the fixed arm extends laterally from the housing. The tip of the fixed arm can be fixed to the handle (claim 8).
With this configuration, the vibration damping device can be easily mounted at the lateral position of the grip in a state where the grip space is formed between the vibration damping device and the grip.
[0036]
The present invention is particularly suitable as a vibration damping device for a handle in a portable agricultural / manufacturing machine with a drive device (claim 9).
[0037]
【Example】
Next, an embodiment in which the present invention is applied to a mower with an engine (a brush cutter) will be described in detail with reference to the drawings.
In FIG. 2, reference numeral 10 denotes the mowing machine with an engine, 12 denotes an engine as a driving device, 14 denotes a rotary blade, and 16 denotes a cover for the rotary blade 14.
Reference numeral 18 denotes a shaft, and reference numeral 20 denotes a handle provided so as to branch off from the shaft 18.
[0038]
The handle 20 has a metal pipe 22 bent in a substantially U-shape, and the pipe 22 is attached to the shaft 18 by an attachment member 23 at the center.
Grips 24 are provided at both ends of the handle 20, and the vibration damping devices 26 and 28 of the present example are substantially in contact with the grips 24 at the distal end position and the lower (root side) position of the grips 24. It is installed.
[0039]
As shown in FIG. 3, the grip 24 is configured by covering a portion on the tip end side of the pipe 22 with a cylindrical rubber elastic body 30.
The vibration damping device 26 on the distal end side of the grip 24 has a substantially dome-shaped rigid housing 32.
A floating chamber 34 is formed inside the housing 32, and a mass member 36 made of a sphere is movably accommodated in the housing 32 with the entire outer peripheral surface thereof covered with an elastic body 38.
[0040]
Here, as shown in FIG. 4, a predetermined gap (a gap on one side in the radial direction is represented by s) is provided between the mass member 36, specifically, the elastic body 38 covering the outer peripheral surface thereof and the inner surface of the housing 32. , A gap obtained by combining the gaps s on one side with each other is represented by 2 s).
The vibration damping device 26 also has a fitting portion 40 having a circular cross section provided integrally with the housing 32, and the fitting portion 40 is press-fitted into the pipe 22 from the open end, whereby the vibration damping device 26 Are fixed to the handle 20.
[0041]
On the other hand, the vibration damping device 28 immediately below the grip 24 has a cylindrical rigid housing 42 in which both ends are closed as shown in FIG. 5, specifically, an outer cylindrical portion 42A, an inner cylindrical portion 42B, and both ends. And a housing 42 having a closing portion 42C.
A cylindrical floating chamber 44 is formed inside the housing 42, and a rigid mass member 46, which is also cylindrical, is freely movable with its entire outer peripheral surface covered with an elastic body 48. Is contained.
[0042]
In this vibration damping device 28 as well, a gap S shown in FIG. 5 is provided between the mass member 46, more specifically, an elastic body 48 covering the outer peripheral surface thereof and the inner surface of the housing 42. ₁ , S ₂ , S ₃ Is formed.
Where the gap S ₁ Is a gap in the axial direction along the pipe 22 (a gap between the upper end surface of the mass member 46, specifically, the elastic body 48 (hereinafter the same) and the closing portion 42C). ₂ Is a gap between the outer peripheral surface of the mass member 46 and the outer cylindrical portion 42A, a gap S ₃ Is a gap between the inner peripheral surface of the mass member 46 and the inner cylindrical portion 42B.
[0043]
In this example, the gap S ₂ Is the gap S ₃ Therefore, the mass member 46, more specifically, the elastic body 48 on the outer surface of the mass member 46 collides with the inner surface of the housing 42, specifically, the inner surface of the outer cylinder portion 42A when vibrating in the direction perpendicular to the axis, and the inner cylinder portion 42B Does not collide with
However, gap S ₂ And gap S ₃ Is reversed, that is, the gap S ₃ The gap S ₂ It is also possible to make the mass member 46 to collide with the inner cylinder portion 48B.
[0044]
In this case, the outer cylinder portion 42A does not function as the original contact portion, but merely functions as a cover for covering the mass member 46 from the outer peripheral surface, and the inner cylinder portion 42B functions as the contact portion. Become.
Gap S ₂ And gap S ₃ Are equal, both the outer tube portion 42A and the inner tube portion 42B function as contact portions.
[0045]
In this example, the vibration damping device 28 is fixed to the pipe 22 by press fitting.
Therefore, in this example, the housing 42 has the inner cylindrical portion 42B, and the vibration damping device 28 is fixed to the handle 20 by the frictional force between the inner cylindrical portion 42B and the pipe 22.
However, in a case where the vibration damping device 28 is fixed to the pipe 22 by another mounting method, the inner cylindrical portion 42B and the outer cylindrical portion 42A may be omitted in some cases.
In this case, the pipe 22, that is, a part of the handle 20 itself functions as a contact portion.
[0046]
The vibration damping device 28 can also be mounted on the handle 20 at a lower position spaced from the grip 24 as shown in FIG.
Also in the vibration damping device 26 on the distal end side from the grip 24, as shown in FIG. 9, a male screw portion 50 is provided integrally with the housing 32 instead of the fitting portion 40, and the male screw portion 50 is attached to the pipe 22. The vibration damping device 26 can be fixed to the handle 20 by being screwed into the female screw portion 52 provided.
[0047]
In the case of the vibration damping devices 26 and 28 of this example, when the handle 20 starts to vibrate, the housings 32 and 42 are displaced integrally with the handle 20 and start to vibrate in synchronization with the handle 20, but one of the mass members 36 and 46 The mass members 36, 46 collide with the housings 32, 42 in the vibration direction when the housings 32, 42 vibrate because the mass members 36, 46 move freely and independently in the vibration direction with respect to the housings 32, 42. Acts to cancel the vibrations of 32 and 42, that is, the vibration of the handle 20.
[0048]
At this time, kinetic energy is applied to the mass members 36 and 46 from the housings 32 and 42 in the opposite direction, and the mass members 36 and 46 move in the opposite directions. Then, it collides again with the contact surface located at a position opposite to the first contact surface and acts so as to cancel the vibration of the handle 20.
[0049]
The mass members 36 and 46 repeat the same movement in the opposite or different phase from the housings 32 and 42 thereafter, and absorb the vibration energy of the housings 32 and 42, that is, the handle 20 at each collision, and reduce the vibration energy. Convert to your own kinetic energy. As a result, the vibration energy of the handle 20 is attenuated due to the energy absorption by the sliding friction at that time, and the vibration is effectively damped.
[0050]
FIG. 6 shows the damping effect when the damping device is attached to the handle 20 in comparison with the case where the damping device is not attached.
Here, in FIG. 6, the horizontal axis represents frequency, and the vertical axis represents acceleration. In the figure, the dotted line indicates the result of measurement without the vibration damping device, and the solid line indicates the result of measurement with the vibration damping device mounted.
However, the measurement results shown in FIG. 6 are obtained by attaching the vibration damping devices 54 and 56 shown in FIG. 7 to the handle 20 and attaching the acceleration sensor 58 to the positions shown in FIG. Represents the result of the measurement.
[0051]
Here, the vibration damping device 54 has a predetermined shape in a state in which a mass member 64 of a corresponding shape is covered with an elastic body 66 inside a floating chamber 62 in a rigid housing 60 having a circular cross-sectional shape and a square vertical cross-sectional shape. The vibration damping device 56 is provided in a floating chamber 68 in a rigid housing 67, more specifically, in a floating chamber 68 having a circular vertical cross section and a square cross section. In this state, the mass member 70 having the following shape is covered with the elastic body 72 and accommodated in a floating state with a predetermined gap.
[0052]
As shown in FIG. 6, it can be seen that the vibration transmitted to the handle 20, more specifically, the grip 24 can be effectively suppressed by attaching the vibration damping devices 54 and 56 to the handle 20 at positions distal and lower than the grip 24.
[0053]
Further, the vibration damping devices 26 and 28 of this example have no particular frequency dependency unlike the dynamic damper, can suppress the vibration over a wide frequency range, have a small temperature dependency, and have a high temperature to a low temperature. Good vibration damping effect over a wide temperature range.
In addition, since the required mass of the mass members 36 and 46 is sufficient, the space required for the entire apparatus is small and compact, and the mass members 36 and 46 have various features such as easy mounting on the handle 20.
[0054]
In particular, since the vibration damping devices 26 and 28 of the present example are of an external type with respect to the handle 20, the vibration damping devices 26 and 28 can be easily attached as they are without modifying the current handle 20. Thus, the vibration of the handle 20 that has conventionally greatly vibrated can be reduced to a level that can be satisfied with the bodily feeling.
[0055]
In the vibration damping devices 26 and 28 of the present example, the contact portions are formed by rigid housings 32 and 42 which are separate from the handle 20, so that they can be easily pressed into the pipe 22 of the handle 20. The vibration damping devices 26 and 28 can be mounted on the handle 20.
[0056]
FIG. 10 shows another embodiment of the present invention.
In this example, a vibration damping device 74 is attached to the handle 20 in a state where a grip space 92 into which a hand can be inserted is formed at a position lateral to the grip 24 in the handle 20.
The vibration damping device 74 also has a rigid housing 76, inside which an idle chamber 78 is formed, in which a mass member 80 is coated with an elastic body 82 on the outer peripheral surface, and the inner wall of the housing 76 is It is housed movably with a predetermined gap formed therebetween.
[0057]
In this example, fixed arms 84 and 86 extend laterally from the housing 76.
One of the fixed arms 86 has a fitting hole 88, and the fitting hole 88 is fitted to the pipe 22. The other fixed arm 84 is provided with a fitting portion 90. Is press-fitted inside the pipe 22.
[0058]
The vibration damping device 74 is attached to the handle 20, specifically, the pipe 22 at a position lateral to the grip 24 by the fixed arms 84 and 86.
[0059]
As described above, in the vibration damping device 74 of the present embodiment, the fixed arms 84 and 86 are extended laterally from the rigid housing 76, and the distal ends of the fixed arms 84 and 86 are fixed to the handle 20. Therefore, the vibration damping device 74 can be mounted at a lateral position of the grip 24 in a state where the grip space 92 into which a hand can be inserted is easily formed between the vibration damping device 74 and the grip 24.
Thereby, the transmission of vibration to the grip 24 can be suppressed at a position immediately adjacent to the grip 24, and the transmission of vibration from the handle 20 to the hand can be effectively suppressed.
[0060]
FIG. 11 shows an embodiment in which the present invention is applied to an electric drill as an electric tool.
In the figure, 100 is an electric drill, 102 is a main body, 104 and 106 are a rear handle and a front handle, respectively, 108 is a blade, 110 is a switch, and 112 is a power cord.
In this example, the vibration damping devices 26 and 28 are mounted at positions on the distal end side and the base side of the grip 114 of the front handle 106.
By attaching the vibration damping devices 26 and 28 to the front handle 106 in this manner, the vibration of the front handle 106 can be effectively suppressed.
[0061]
FIG. 12 shows an embodiment in which the present invention is applied to a rock drill. In the figure, reference numeral 116 denotes a rock drill, reference numeral 118 denotes a main body thereof, and reference numeral 120 denotes a blade at a tip.
Reference numeral 122 denotes a handle. Vibration damping devices 26 and 28 are mounted on the handle 122 at positions on the tip side and the base side of the pair of left and right grips 124, respectively.
By attaching the vibration damping devices 26 and 28 to the handle 122 of such a rock drill 116, the vibration of the handle 122 can be satisfactorily suppressed.
[0062]
Although the embodiment of the present invention has been described in detail, this is merely an example, and the present invention is not limited to the handle of the mowing machine, the handle of the electric drill, and the handle of the rock drilling machine of the above example. It can be configured in various modified forms without departing from the gist of the invention, such as being applicable as a vibration device.
[Brief description of the drawings]
FIG. 1A is a diagram schematically showing one embodiment of a vibration damping device according to the present invention in comparison with a dynamic damper.
(B): It is explanatory drawing of the effect of the vibration damping device of (A).
FIG. 2 is a diagram showing the damping device according to the embodiment of the present invention together with the mower in a state where the damping device is mounted on a handle of the mower.
FIG. 3 is an enlarged view showing the vibration damping device of the embodiment in a state where the vibration damping device is attached to a handle.
FIG. 4 is an enlarged view of one of the two vibration damping devices shown in FIG. 3;
FIG. 5 is an enlarged view of the other of the vibration damping devices of FIG. 3;
FIG. 6 is a graph showing an effect of the vibration damping device of the embodiment.
FIG. 7 is a diagram showing the vibration damping device used for confirming the effect shown in FIG. 6 in a state of being attached to a handle.
FIG. 8 is a diagram showing another embodiment of the present invention.
FIG. 9 is a view showing still another embodiment of the present invention.
FIG. 10 is a diagram showing still another embodiment of the present invention.
FIG. 11 is a view showing still another embodiment of the present invention.
FIG. 12 is a view showing still another embodiment of the present invention.
[Explanation of symbols]
26, 28, 54, 56, 74 Damping device
36, 46, 64, 70, 80 Mass member
38, 48, 66, 72, 82 elastic body
32, 42, 60, 76 Housing (contact part)
10 Mower with engine
12 Engine
20 handle
24 grips
34,44,62,68,78 Floating chamber
42A outer cylinder
42B inner cylinder
42C closure
50 Male thread
52 Female thread
84,86 Fixed arm
92 Grip space
S ₁ , S ₂ , S ₃ Gap

Claims (9)

A contact portion of rigidity that is displaced integrally with the vibrating handle, a mass member provided in a floating state in the vibration direction with respect to the corresponding portion, and colliding with the corresponding portion at the time of vibration, and between the corresponding portion and the mass member A vibration control handle, comprising: a clearance formed to allow the mass member to float in the vibration direction; and an elastic body formed on at least one of the contact surfaces of the contact portion and the mass member. Shaker. The vibration damping device for a vibrating handle according to claim 1, wherein the vibration damping device is an external type having the mass member outside the handle. The vibration damping device according to any one of claims 1 and 2, wherein the vibration damping device has a rigid housing having an idle chamber therein, and the housing constitutes the contact portion. A vibration damping device for a vibrating handle, wherein the mass member is accommodated in a floating state. 4. The vibration damping device for a vibrating handle according to claim 3, wherein the housing is separate from the handle, and is fixed to the handle by a fixing means such as a press fit or a screw. The vibration damping device for a vibrating handle according to any one of claims 1 to 4, wherein the vibration damping device is mounted on the handle at a position on the distal end side of a grip. The vibration damping device for a vibrating handle according to any one of claims 1 to 4, wherein the vibration damping device is mounted on the handle at a position closer to a root of the handle than a grip. The grip according to any one of claims 1 to 4, wherein the vibration damping device is mounted on the handle at a lateral position of the grip in a state where a grip space into which a hand can be inserted is formed between the damper and the grip. Vibrating handle vibration control device. In claim 7, wherein the vibration damping device has a rigid housing, the housing constitutes the contact portion, and the mass member is accommodated in a floating state in a floating chamber in the housing, A fixed arm extends laterally from the housing, and a distal end portion of the fixed arm is fixed to the handle in a state of forming a grip space into which a hand can be inserted between the housing and the grip. A vibration damping device for a handle that vibrates. The vibration damping device for a vibrating handle according to any one of claims 1 to 8, wherein the handle is a portable agricultural or industrial machine with a drive device.

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