JPH0542947Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a vibration suppressing device attached to a steering device for a vehicle.

Prior Art In order to avoid problems such as engine vibrations being transmitted to the steering wheel via the steering shaft and causing resonance, a dynamic damper is installed in the boss of the steering shaft to suppress vibrations. .

However, the boss part of the steering shaft is designed to be covered with a case, and various parts such as the horn switch harness are arranged inside, so there is a limit to the space in which to place the dynamic damper, but it is difficult to maximize the vibration suppression effect. Since the size of the mass body of the dynamic damper is set in such a way that there is no unnecessary space between the mass body and various members.

Therefore, if there is a vibration that is more intense than usual, there is a risk that it will interfere with the mass body and various members around it, as well as the case, etc., producing abnormal noise and causing problems such as damage to the harness and the like.

In order to prevent such problems from occurring, an example has been proposed in which a stopper is provided to restrict the amount of movement of the mass body (Japanese Patent Application Laid-Open No. 149552/1983).

The structure of a vibration suppressing device of the same example is illustrated in FIG.

It is a sectional view of a main part of a steering device, and 01 is a steering shaft, and 02 is a steering wheel.

The vibration suppression device is disposed on the boss plate 03 at the center of the steering wheel 02, and is composed of a base plate 04, three support legs 05, and a mass body 06.

The base plate 04 is made of a substantially hexagonal plate-shaped sheet metal, has a through hole in the center from which the tip of the steering shaft 01 can protrude, and has rubber support legs 0 that are vulcanized and bonded.
Stoppers 04a are cut and raised at predetermined positions near the base plate 04 to bend the upper ends toward the center of the base plate 04, respectively.

The support legs 05, which are arranged at three locations around the steering shaft 01, have their upper end surfaces connected to the mass body 06.
The lower end surface is vulcanized and adhered to the base plate 04 to elastically support the mass body 06.

The stopper 04a includes a support leg 05 that swings with the mass body 06 so that the mass body 06 does not interfere with the lower cover 07, the fixing nut 08 of the steering wheel 02, etc. when the mass body 06 swings. The distance from the support leg 05 and its height are set to predetermined dimensions so that movement of the support leg 05 can be restricted.

Therefore, even if there is severe vibration, the movement of the mass body 06 is restricted within a certain range by the stopper 04a, and interference with other members can be prevented.

Problems to be Solved In the support structure for the mass body 06 in the conventional example, the upper and lower end surfaces of the support legs 05 are vulcanized and bonded to the mass body 06 and the base plate 04, respectively, but there is always a risk that these bonded parts will peel off. There is also a possibility that the support leg 05 itself may be cut off.

If some of the support legs 05 are peeled off or cut, it becomes impossible to restrict movement of the mass body beyond a predetermined range, and there is a risk that the mass body will move to an unexpected position and interfere with other members.

In addition, peeling and cutting of some of the support legs 05 may cause the adhesive parts of other support legs 05 and the support legs 05
This will place a large burden on itself, and eventually peeling or cutting may occur, causing the mass body 06 to be completely separated from the base plate 04 and move freely within the cover, potentially damaging other members.

Means and Effects for Solving the Problems The present invention has been made in view of the above points, and its purpose is to provide a vibration suppressing device that can always restrict the movement of a mass body within a predetermined range. .

That is, the present invention provides a vibration suppressing device in which a mass body is attached to a base plate disposed on a steering shaft via an elastic body, in which depressions are formed in at least two locations on the outer periphery of the upper surface of the mass body, and the mass body is provided with depressions in at least two places on the outer periphery of the upper surface of the mass body. A vehicle in which an upright projecting piece is bent at its upper end, and the bent part is loosely fitted into a recess of the mass body with a predetermined interval, thereby regulating movement of the mass body with respect to the base plate within a predetermined range. This is a vibration suppression device for a steering device.

By elastically supporting the mass body on the base plate, vibrations at the upper end of the steering shaft can be suppressed, and a protruding piece extending from the base plate into a recess provided in the mass body controls the movement of the mass body with respect to the base plate. Since it is loosely fitted with a predetermined interval so that it is regulated within the range, even when the mass body tries to move extremely due to severe vibration, it is regulated by the protruding piece and remains within the predetermined range. This allows interference with other members to be avoided.

In the unlikely event that the adhesive between the mass body and the elastic body or the elastic body and the base plate is separated, or the elastic body itself is severed and the mass body is completely separated from the base plate, the mass body will still be able to move freely. The protruding piece prevents the mass body from falling off, and by always positioning the mass body within a predetermined range near the base plate, it is possible to prevent problems such as damage due to contact with other members.

Embodiment An embodiment of the present invention illustrated in FIGS. 2 to 8 will be described below.

The steering shaft 1 has a screw formed at its upper end, and a plurality of protrusions oriented in parallel with the central axis are formed below the thread in the circumferential direction, and a steering wheel mounting member 2 is fitted into the protrusions. The steering wheel 3 is fixed to and supported by the steering wheel mounting member 2 at its central portion.

The center portion of the steering wheel 3 is covered by a lower case 5 and an upper case 6, and a dynamic damper 10 is attached to the steering wheel mounting member 2 inside the lower case 5 and upper case 6.

The structure of this dynamic damper 10 is illustrated in FIGS. 4 to 6.

The general structure is that a mass body 11 is elastically supported by a base plate 13 via a rubber body 12.

The mass body 11 is a thick rectangular metal plate in which a large diameter circular hole 11a and a small diameter circular hole 11b are bored.

A portion of the short opposing side edges of the outer periphery of the upper surface of the mass body 11 is depressed to form a recess 11c.

On the other hand, the base plate 13 is formed by bending a rectangular metal plate at a position slightly offset from the center to form a recess, and a circular hole 13d is bored in the center of the bottom body 13a of the recess, and a small hole is formed in one side body 13c. 13e is bored.

The projecting pieces 13f are formed by extending slightly outward from a portion of the opposing short sides, and then being bent upward, and the upper end portions are further bent inward.

4 between the mass body 11 and the base plate 13
A rubber body 12 is interposed at the corner, and the rubber body 12 has its upper end surface connected to the mass body 11 and its lower end surface connected to the base plate 1.
3 to elastically support the mass body 11.

The circular holes 11a and 11b of the mass body 11 correspond to the circular hole 13d and the small hole 13e of the base plate 13, respectively, and the bent end of the protruding piece 13f extending from both sides of the base plate 13 is in the recess 11c of the mass body 11. The parts are loosely fitted.

When attaching the dynamic damper 10 having the above structure to the boss portion of the steering shaft 1,
Overlap the back surface of the base plate 13 on the steering wheel mounting member 2 fitted to the steering shaft 1 as described above, and make the tip threaded portion of the steering shaft 1 protrude from the circular hole 13d.
The nut 7 is screwed into the threaded portion, and the screw 8 is screwed into the other small hole 13e by matching it with a predetermined female thread of the mounting member 2.

The circular holes 11a and 11b of the mass body 11 are holes for tightening the nuts 7 and screws 8,
The base plate 13 and the mounting member 2 are tightened and integrally fixed to the steering shaft 1 by screwing together the nuts 7 and the like using the same holes.

Therefore, the mass body 11 is elastically supported by the rubber body 12 on the base plate 13 which is prevented from rotating by the screw engagement with the screw 8 and is integrally fixed to the steering shaft 1.

When the upper case 6 is placed over the dynamic damper 10, a space within which the mass body 11 can move is secured within the case due to the deformation of the rubber body 12.

Here, the positional relationship between the mass body 11 and the base plate 13 in the dynamic damper 10 will be described in detail with reference to FIGS. 5 and 6.

Figures 5 and 6 show a state in which the Daimic damper 10 is held horizontally and no force is applied;
In the cross-sectional view), the distance between one side of the mass body 11 and the bent end side of the protruding piece 13f of the base plate 13 is A, and the distance between the inner surface of the other recess 11c of the mass body 11 and the side of the bent end of the protruding piece 13f of the base plate 13 is A. Projecting piece 1
If the distance from the side of the bent end of 3f is B, then A>B always holds true.

Since the loose fitting portion is constructed symmetrically on both sides, A>B holds even if A and B are set oppositely.

Further, the distance between the upper surface of the mass body 11 and the lower surface of the bent end of the protruding piece 13f of the base plate 13 is C, and the distance between the lower surface of the mass body 11 and the upper surface of the side bodies 13b and 13c of the base plate 13 is D. Then,
There is a positional relationship such that S>D always holds true.

Furthermore, in FIG. 6, which is a cross-sectional view taken from FIG.
The distance between the side edge of the lower surface and the lower surface of the bent end of the protruding piece 13f is E,
Letting F be the distance from the top surface of 13c, the setting is made so that E>F holds true.

The protruding piece 13f of the base plate 13 is the mass body 1
By determining the maximum amplitude of mass 1 and satisfying the above conditions, mass body 1 can be set under any circumstances.
1 can be prevented from coming off and falling off the protruding piece 13f.

That is, regarding the movement of the mass body 11 in the longitudinal direction, since A>B, the mass body 1 shown in FIG.
For example, when 1 moves to the left in the figure, A=
Even if B becomes 0 before becoming 0 and the right side of the mass body 11 rises as shown in FIG. .

At this time, even if the left side of the mass body 11 descends and the lower surface contacts the side body 13c (D=0), since C>D, there is still room for C, so the left protruding piece 13
The bent end of f always comes into contact with the side surface of the recess 11c,
In the state shown in FIG. 7, even if the right side of the mass body 11 rises, it will not come off the right side protrusion 13f.

Conversely, even if the mass body 11 moves to the right, the same holds true, and the left side of the mass body 11 does not come off the left protruding piece 13f.

Also, regarding the movement of the mass body 11 in the width direction (horizontal direction in FIG. 6), since C>D, the mass body 11 descends and comes into contact with the side bodies 13b and 13c (D=0). Even if it moves in the width direction, the protruding piece 13f comes into contact with the side surface of the recess 11c due to the remaining portion of C and does not come off.

As shown in FIG. 8, when the entire mass body 11 moves to the right, the left side of the mass body 11 descends, and the right side rises and comes into contact with the protruding piece 13f.
Since E>F, the mass body 11 is always the protruding piece 13f.
The right side of the mass body 11 will not further rise from this state, the left side will not fall, and the mass body 11 will not come off while rotating from the protruding piece 13f.

The same applies when the mass body 11 moves to the left.

Therefore, the mass body 11 is always connected to the base plate 1.
The base plate 1 is regulated by the protruding piece 13f of 3.
It is restricted within a predetermined range in the vicinity of 3.

Therefore, even if the adhesive surfaces of all the rubber bodies 12 that elastically support the mass body 11 are peeled off or the rubber bodies 12 themselves are cut and the mass body 11 is able to move freely, the protrusion of the base plate 13 Piece 1
The movement range is restricted by 3f, and it is possible to prevent the mass body 11 from falling off.

As described above, the dynamic damper 10 in this embodiment has the protruding piece 13f of the base plate 13.
This functions as a stopper when the mass body 11 swings beyond the set maximum amplitude, and prevents interference with other parts, and also prevents the adhesive surface of the rubber body 12 from peeling off or the rubber body 12 itself. Even if the mass body 11 becomes free to move due to cutting, the protruding piece 13f
can restrain the mass body 11 within a predetermined range and prevent it from falling off.

If the mass body 11 falls off, the vibrations of the steering shaft will cause the fallen mass body 11 to move freely inside the case, causing damage to other parts or causing problems such as short circuits in the electrical system due to disconnection of the harness, etc. However, the structure of this embodiment can avoid such a situation from occurring.

In the above embodiment, the loose fitting portions between the recess 11c of the mass body 11 and the protruding piece 13f of the base plate 13 are provided at two locations, but three or more may be provided at appropriate locations.

Effects of the invention The present invention provides a simple structure in which a protruding piece extending from a base plate is loosely fitted into a recess formed in a mass body with a predetermined interval that restricts the movement of the mass body with respect to the base plate within a predetermined range. With this structure, the protruding piece functions as a stopper to prevent the mass body from swinging beyond the set maximum amplitude, preventing interference with other parts, and also prevents the adhesive surface of the elastic body from peeling off or the elastic body itself being cut. Even when the mass body falls off, it is possible to prevent the mass body from falling off and avoid problems such as damage to other parts.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a main part of a conventional steering device, FIG. 2 is a plan view showing the attachment position of a dynamic damper according to an embodiment of the present invention to a steering wheel, and FIG. A sectional view, FIG. 4 is a perspective view of the dynamic damper of the same embodiment,
5 is a cross-sectional view of FIG. 4, FIG. 6 is a cross-sectional view of FIG. 4, FIG. 7 is a cross-sectional view of the dynamic damper in one state showing the positional relationship between the base plate and the mass body, and FIG. 2 is a sectional view of the dynamic damper showing the positional relationship between the base plate and the mass body in another state; FIG. DESCRIPTION OF SYMBOLS 1... Steering shaft, 2... Steering wheel mounting member, 3... Steering wheel, 4... Side wall, 5... Lower case, 6...
Upper case, 7...nut, 8...screw, 1
0...Dynamic damper, 11...Mass body, 1
1a, 11b...circular hole, 11c...recess, 12...
...Rubber body, 13...Base plate, 13a...
Concave bottom body, 13b, 13c... side body, 13d...
Circular hole, 13e...Small hole, 13f...Protruding piece.

Claims (1)

[Scope of utility model registration request] In a vibration suppressing device configured to attach a mass body to a base plate disposed on a steering shaft via an elastic body, depressions are formed in at least two locations on an outer periphery of an upper surface of the mass body, and a protrusion is provided upright from the base plate. The piece is bent at its end, and the bent part is loosely fitted into the recess of the mass body at a predetermined distance, thereby regulating the movement of the mass body with respect to the base plate within a predetermined range. Vibration suppression device for vehicle steering devices.