JP6838317B2 - Mass and vibration suppressor - Google Patents

Description

The present invention relates to a mass body and a vibration suppression device.

Conventionally, a dynamic damper (vibration suppression device) provided for suppressing vibration of a steering wheel of a vehicle has been proposed. (See, for example, Patent Document 1). In the dynamic damper described in Patent Document 1, a hole for inserting a wire harness is formed in a bracket for attaching a mass member (mass body) to the steering wheel, and a notch corresponding to this hole is formed in the mass member. Has been done. That is, the mass member does not interfere with the wire harness, and the deterioration of the vibration damping action is suppressed.

Japanese Unexamined Patent Publication No. 2014-218204

However, while such a mass member has a reduced damping action due to interference with other members, if the amplitude becomes too large, a vibration-proof substrate (elastic member) provided between the mass member and the bracket is provided. Could be damaged. Therefore, a configuration is conceivable in which the movement of the mass member is restricted by providing a stopper at an appropriate position. However, when the size of the mass member becomes large, the center of gravity of the mass member and the portion in contact with the stopper are separated from each other. It is difficult to regulate the movement of the mass member at a position away from the center of gravity in this way, and it is necessary to increase the number of stoppers and improve the strength.

An object of the present invention is to provide a mass body and a vibration suppressing device capable of easily suppressing hypervibration.

The mass body of the present invention is a mass body that suppresses vibration of the steering wheel by being connected to the steering wheel via an elastic member, and is formed in a rectangular shape and has a cross section orthogonal to the axial direction of the steering wheel. A main body having a rectangular shape and a pair of side portions having the same rectangular shape and having a rectangular cross-sectional shape orthogonal to the axial direction of the steering wheel are integrally provided, and the steering wheel is attached to the vehicle body. When the main body and each side are viewed with the line of sight directed in the axial direction of the steering wheel while the vehicle is fixed and fixed in a straight-ahead state of the vehicle, each side is said to have an upper side or a lower side as a connecting side. It is located on the connection side of the main body, and the lower right corner of the left side is connected to the upper and left corners of the main body, and the lower left corner of the right side is connected to the upper and right corners of the main body. The overall shape with the corners combined, or the lower and left corners of the main body are combined with the upper right corner of the left side, and the lower and right corners of the main body are combined with the upper left corner of the right side. It has an overall shape, and the cross-sectional shape orthogonal to the axial direction of the steering wheel is the same shape over the entire area of the axial direction .

According to the mass body of the present invention, hypervibration can be easily suppressed.

It is a partial cross-sectional view which shows the steering wheel provided with the vibration suppression device which concerns on embodiment of this invention. It is a front view which shows the vibration suppression device. It is a back view which shows the vibration suppression device. It is sectional drawing which shows the mass body of the vibration suppression apparatus. It is a front view which shows the state that the mass body vibrated (A) upward or (B) downward. It is a front view which shows the appearance that the mass body vibrated in one (A) vehicle width direction or (B) the other. It is a back view which shows the vibration suppression apparatus which concerns on the modification of this invention.

The invention according to claim 1 is a mass body that suppresses vibration of the steering wheel by being connected to the steering wheel via an elastic member, is formed in a rectangular shape, and is in the axial direction of the steering wheel. The steering wheel integrally includes a main body having a rectangular cross-sectional shape and a pair of side portions having the same rectangular shape and having a rectangular cross-sectional shape orthogonal to the axial direction of the steering wheel. Is fixed to the vehicle body, and when the main body and each side are viewed with the line of sight directed in the axial direction of the steering wheel while the vehicle is fixed in a straight-ahead state, each side connects the upper side or the lower side. It is located on the connection side of the main body as a side, and the lower right corner of the left side is connected to the upper and left corners of the main body, and the right side is connected to the upper and right corners of the main body. The overall shape of the lower left corner of the main body, or the upper right corner of the left side is connected to the lower and left corners of the main body, and the upper left corner of the right side is connected to the lower and right corners of the main body. It is a mass body having an overall shape in which the steering wheels are combined, and the cross-sectional shape orthogonal to the axial direction of the steering wheel is the same shape over the entire area in the axial direction.

Hereinafter, examples of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 3, the vibration suppression device 1 of the present embodiment is provided in the hub so as to be located substantially at the center of the steering wheel W of the vehicle, and the mass body 2 and the bracket 3 are provided. A mass body cover 4 and a floating rubber 5 as an elastic member are provided. In this embodiment, the vehicle width direction is the X direction, the axial direction of the steering wheel W is the Y direction, and the vertical direction is the Z direction. In the following, “left and right” in the X direction and “up and down” in the Z direction are based on FIG. 1 unless otherwise specified. Further, the "front" and "back" in the Y direction are based on the passenger, and the front side of the paper surface in FIG. 1 is the front side and the back side of the paper surface is the back side. Further, in this embodiment, it is assumed that the axial direction of the steering wheel W substantially coincides with the traveling direction of the vehicle, but the axial direction of the steering wheel W has a slight inclination with respect to the traveling direction of the vehicle. May be good.

The mass body 2 is composed of a high-density member such as a metal member and is connected to the steering wheel W via a floating rubber 5 to suppress vibration. The mass body 2 has a rectangular parallelepiped main body 21 having each surface extending along the XY plane, the YZ plane, or the ZX plane, and a pair of rectangular parallelepiped side portions having each surface extending along the XY plane, the YZ plane, or the ZX plane. 22 and 23, and the main body 21 and the pair of side portions 22 and 23 are integrally formed. The pair of side portions 22 and 23 are connected to both sides in the X direction extending along the Y direction on the upper surface side of the main body portion 21, respectively.

That is, as shown in FIG. 4, the main body portion 21 has a rectangular cross section 21A orthogonal to the Y direction (along the ZX plane), and the pair of side portions 22 and 23 have connecting cross sections 22A and 23A. .. The connecting cross sections 22A and 23A are continuous with the rectangular cross section 21A, and the lower corners thereof are connected to the upper (connecting side) and both corners in the X direction of the rectangular cross section 21A. By connecting the pair of side portions 22 and 23 to the main body portion 21 in this way, the mass body 2 has a hat shape (Y shape) as a whole in the cross section 2A orthogonal to the Y direction. The surfaces of the side portions 22 and 23 are substantially parallel to each surface of the main body portion 21.

At this time, the connecting cross sections 22A and 23A may be connected to the rectangular cross section 21A while sharing the corners. That is, the connected connecting cross sections 22A and 23A and the rectangular cross section 21A may have a shape in which the corners of the two rectangles overlap each other, or the corners may be in point contact with each other. May be good.

The upper surface of the main body 21 becomes the first contact surface 211 that indirectly contacts the first stopper 32 described later, and the lower surfaces of the side portions 22 and 23 indirectly contact the second stoppers 33 and 34 described later. The second contact surfaces are 221 and 231 in contact with each other. Further, the center of gravity O of the mass body 2 is located substantially at the center in the X and Y directions, and is located in the vicinity of the first contact surface 211 and the second contact surfaces 221, 231 of the main body 21 in the Z direction. To position. Further, in the ZX plane, the center of gravity O of the mass body 2 is arranged near the center of gravity of the steering wheel W.

The bracket 3 is made by bending and punching a sheet metal, and has a plate body 31 extending along a ZX plane, a first stopper 32 bent so as to rise from the plate body 31, and a pair of second stoppers. It has 33, 34 and.

The plate body 31 has a shape in which each side of the rectangle is cut out. Fixing holes through which bolts 6 for fixing to the steering wheel W are inserted are formed in the corners on the upper side and both sides in the X direction of the plate body 31.

The first stopper 32 is formed in the notch on the upper side of the plate body 31 and extends along the XY plane by being bent, and the lower surface thereof becomes the stopper surface 321. Further, the first stopper 32 is formed at the center of the plate body 31 in the X direction.

The pair of second stoppers 33, 34 are formed at positions sandwiching the notch on the lower side of the plate body 31, and extend along the XY plane by being bent, and the upper surface thereof becomes the stopper surfaces 331, 341. That is, the pair of second stoppers 33 and 34 are formed in the vicinity of both ends of the plate body 31 in the X direction.

The mass body cover 4 is made of a cushioning member such as rubber, and is attached so as to cover the side surface and the back surface of the mass body 2. Specifically, the mass body cover 4 includes the upper surfaces of the main body 21 and the side portions 22 and 23, the inner side surfaces of the side portions 22 and 23 (side surfaces facing each other), and the lower surfaces of the side portions 22 and 23. It covers the side surface of the main body 21, the entire back surface of the side portions 22 and 23, and the upper portion of the back surface of the main body 21.

The portion of the mass body cover 4 that covers the upper surface of the main body 21 is the first buffer 41, the portion that covers the lower surfaces of the side 22 and 23 is the second buffer 42 and 43, and the portion that covers the side surface of the main body 21. Is the third buffer portions 44 and 45, and the portions covering the inner side surfaces of the side portions 22 and 23 are the fourth buffer portions 46 and 47. The buffer portions 41 to 43 are formed thicker than the other portions and have irregularities.

The mass body cover 4 may be integrally attached to the mass body 2, and may be fixed by an adhesive or the like, or may be fixed by an appropriate fixing member.

The floating rubber 5 is formed in a columnar shape extending in the Y direction, one end of which is connected to the back surface of the mass cover 4, and the other end of which is connected to the front surface of the bracket 3. The floating rubber 5 is provided at a total of three locations in the mass body cover 4, a portion corresponding to the main body portion 21 and a portion corresponding to each of the pair of side portions 22 and 23. The floating rubber 5 corresponding to the main body 21 is provided at a position substantially coincident with the center of gravity O of the mass body 2 on the ZX plane.

Here, the positional relationship between the mass body 2 and the stoppers 32 to 34 of the bracket 3 will be described. First, a state in which an external force does not act on the vibration suppression device 1 and the floating rubber 5 is deformed only by the weight of the mass body 2 is set as a reference state (FIG. 2). The reference state may be the case where the floating rubber 5 is in a natural state without any force acting on it.

The main body 21 is arranged below the first stopper 32, and the first contact surface 211 provided with the first buffer 41 and the stopper surface 321 face each other, and these are at predetermined intervals d1 in the reference state. Only apart. That is, the first stopper 32 is provided so as to face the main body 21 so as to restrict the upward movement of the mass body 2 as described later.

The side portions 22 and 23 are arranged above the second stoppers 33 and 34, respectively, and the second contact surfaces 221, 231 provided with the second buffer portions 42 and 43 and the stopper surfaces 331 and 341 face each other. At the same time, they are separated by a predetermined interval d2 in the reference state. In this embodiment, the interval d1 and the interval d2 are substantially equal to each other. That is, the second stoppers 33 and 34 are provided so as to face the side portions 22 and 23 so as to restrict the downward movement of the mass body 2 as described later.

The first stopper 32 is arranged so as to be sandwiched between the pair of side portions 22 and 23, and the inner side surface of the side portions 22 and 23 provided with the fourth buffer portions 46 and 47 and the X direction of the first stopper 32. Are opposed to each other, and they are separated by predetermined intervals d3 and d4 in the reference state. In this embodiment, the interval d3 and the interval d4 are substantially equal to each other.

The pair of second stoppers 33, 34 are arranged so as to sandwich the main body 21, the side surface of the main body 21 provided with the third buffers 44, 45, and the inner ends of the second stoppers 33, 34 in the X direction. The portions face each other, and they are separated by predetermined intervals d5 and d6 in the reference state. In this embodiment, the interval d5 and the interval d6 are substantially equal to each other, and further, these are assumed to be substantially equal to the interval d3 and the interval d4.

By arranging the mass body 2 and the stoppers 32 to 34 of the bracket 3 as described above, the portions of the main body 21 and the side portions 22 and 23 facing the first stopper 32 or the second stoppers 33 and 34 Is provided with a shock absorber.

Hereinafter, a case where the mass body 2 tries to over-vibrate due to an external force along the Z direction in the vibration suppression device 1 will be described. When the mass body 2 tries to move upward by an interval d1 or more, as shown in FIG. 5A, the first buffer portion 41 provided on the first contact surface 211 of the main body portion 21 becomes the first stopper. It comes into contact with the stopper surface 321 of 32, and its upward movement is restricted.

Further, when the mass body 2 tries to move downward by an interval d2 or more, as shown in FIG. 5 (B), the second buffer provided on the second contact surfaces 221 and 231 of the side portions 22 and 23. The portions 42, 43 come into contact with the stopper surfaces 331, 341 of the second stoppers 33, 34, and the downward movement is restricted.

In this way, when the mass body 2 tries to move in the Z direction at intervals d1 and d2 or more from the reference state, the movement is restricted and hypervibration in the Z direction is suppressed.

Next, a case where the mass body 2 tries to over-vibrate due to an external force along the X direction in the vibration suppression device 1 will be described. When the mass body 2 tries to move toward the left by an interval d4, d6 or more, as shown in FIG. 6A, a third buffer portion 44 provided on the left side surface of the main body portion 21 becomes a second stopper. The fourth buffer portion 47 provided on the inner side surface of the side portion 23 abuts on the right end portion of the 33, and abuts on the right end portion of the first stopper 32, so that the movement to the left is restricted.

Further, when the mass body 2 tries to move toward the right by an interval d3, d5 or more, as shown in FIG. 6B, the third buffer portion 45 provided on the right side surface of the main body portion 21 becomes the third. 2 The left end of the stopper 34 is abutted, and the fourth buffer 46 provided on the inner side surface of the side 22 is in contact with the left end of the first stopper 32, and the movement to the right is restricted. ..

As described above, when the mass body 2 tries to move in the X direction at intervals d3 to d6 or more from the reference state, the movement is restricted and the hypervibration in the X direction is suppressed.

In the above description, the vibration of the mass body 2 in the Z direction and the vibration in the X direction have been described independently, but these vibrations can occur in combination. However, even when complex vibration occurs, the vibration of the mass body 2 in the Z direction and the X direction is suppressed in the same manner as described above.

According to this embodiment, there are the following effects. That is, in the mass body 2, the pair of side portions 22, 23 are connected to both sides of the main body portion 21 in the X direction with the upper side as the connecting side, and the center of gravity O of the mass body 2 is near the first contact surface 211 in the Z direction. Moreover, by being located near the second contact surfaces 221, 231, the movement of the mass body 2 upward or downward can be regulated by the first stopper 32 or the second stoppers 33, 34 in the vicinity of the center of gravity O. Overvibration can be easily suppressed.

Further, the first stopper 32 is arranged so as to be sandwiched between the pair of side portions 22 and 23 in the X direction, and the pair of second stoppers 33 and 34 are arranged so as to sandwich the main body portion 21 in the X direction. Therefore, the over-vibration of the mass body 2 in the X direction can be suppressed. At this time, the movement can be restricted at a position closer to the center of gravity O as compared with the configuration in which the stoppers are provided on the outer sides of the side portions 22 and 23. Further, by providing the stoppers 32 to 34 in this way, the entire vibration suppression device 1 can be miniaturized.

Further, the mass body 2 comes into direct contact with the stoppers 32 to 34 because the cushioning portion is provided at the portion of the main body portion 21 and the side portions 22 and 23 facing the first stopper 32 or the second stoppers 33 and 34. Without doing so, it is possible to suppress the generation of abnormal noise and the deformation or damage of each part when the movement is restricted.

The present invention is not limited to the above-described embodiment, but includes other configurations and the like that can achieve the object of the present invention, and the following modifications and the like are also included in the present invention.

For example, in the above embodiment, it is assumed that the pair of side portions 22 and 23 are connected to the main body portion 21 with the upper side as the connecting side in the mass body 2, but as shown in FIG. 7, the pair of side portions 22B , 23B may be a mass body 2B connected to the main body portion 21B with the lower side as the connecting side. In the vibration suppression device 1B having such a mass body 2B, the first stopper 32B is provided so as to face the lower surface of the main body 21B, and the second stoppers 33B and 34B are provided so as to face the upper surfaces of the side portions 22B and 23B. Just do it.

Further, in the above embodiment, the first stopper 32 is arranged so as to be sandwiched between the pair of side portions 22 and 23 in the X direction, and the pair of second stoppers 33 and 34 sandwich the main body portion 21 in the X direction. However, for example, when the movable range of the mass body 2 in the Z direction is set wide, the first stopper is located above the upper surface of the side portion and the second stopper is located on the lower surface of the main body portion. It may be located below, that is, the first stopper may not be sandwiched between the pair of side portions and the pair of second stoppers may not sandwich the main body portion 21. At this time, a stopper for restricting the movement of the mass body in the X direction may be separately provided.

Further, in the above embodiment, the cushioning portion is provided at the portion of the main body portion 21 and the side portions 22 and 23 facing the first stopper 32 or the second stoppers 33 and 34, but the stopper is provided with the cushioning portion. The generation of abnormal noise and deformation or damage of each part may be suppressed. Further, for example, when the mass body or the stopper is made of a material that does not easily cause abnormal noise or deformation or breakage of each part at the time of collision, the cushioning part may not be provided.

Further, in the above embodiment, the bracket 3 has stoppers 32 to 34, but the stopper may be provided separately from the bracket and fixed to the steering wheel.

In addition, the best configuration, method, and the like for carrying out the present invention are disclosed in the above description, but the present invention is not limited thereto. That is, the present invention is mainly illustrated and described with respect to specific embodiments, but without departing from the scope of the technical idea and purpose of the present invention, the shape with respect to the above-described embodiments. , Materials, quantities, and other detailed configurations can be modified by those skilled in the art. Therefore, the description that limits the shape, material, etc. disclosed above is merely an example for facilitating the understanding of the present invention, and does not limit the present invention. Therefore, those shapes, materials, etc. The description by the name of the member which removes a part or all of the limitation such as is included in the present invention.

1 Vibration suppression device 2 Mass body 21 Main body 21A Rectangular cross section 22, 23 Side parts 22A, 23A Connection cross section 3 Bracket 32 1st stopper 33, 34 2nd stopper 41 1st buffer 42, 43 2nd buffer 44, 45 3rd buffer 46, 47 4th buffer

Claims (5)

A mass body that suppresses vibration of the steering wheel by being connected to the steering wheel via an elastic member.
A pair of a main body having a rectangular parallelepiped shape and having a rectangular cross-sectional shape orthogonal to the axial direction of the steering wheel, and a pair having a rectangular parallelepiped shape having the same rectangular parallelepiped shape and having a rectangular cross-sectional shape orthogonal to the axial direction of the steering wheel. With the side part of
When the steering wheel is fixed to the vehicle body and the vehicle is fixed in a straight-ahead state and the line of sight is directed in the axial direction of the steering wheel to look at the main body and each side, each side is on the upper side or the lower side. Is located on the connection side of the main body, and the lower right corner of the left side is connected to the upper and left corners of the main body, and the right side is connected to the upper and right corners of the main body. The overall shape with the lower left corners of the side combined, or the upper right corner of the left side combined with the lower and left corners of the main body, and the upper left of the right side with the lower and right corners of the main body It has an overall shape with the corners of
A mass body characterized in that the cross-sectional shape orthogonal to the axial direction of the steering wheel has the same shape over the entire area in the axial direction. A vibration suppression device comprising the mass body according to claim 1 , a bracket for attaching the mass body to the steering wheel, and an elastic member provided between the mass body and the bracket. A first stopper provided so as to restrict the movement of the mass body to the connection side and facing the main body portion.
According to claim 2, further comprising a, a pair of second stoppers provided opposite to each of the pair of side portions so as to restrict movement in the opposite side to the connection side of the mass body Vibration suppression device. The first stopper is arranged so as to be sandwiched between the pair of side portions.
The vibration suppression device according to claim 3 , wherein the pair of second stoppers are arranged so as to sandwich the main body portion. The vibration suppression device according to claim 3 or 4 , wherein a cushioning portion is provided in a portion of the main body portion and the side portion facing the first stopper or the second stopper.

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