JPH07165148A - Steering stabilizing device for prime mover vehicle - Google Patents

Abstract

PURPOSE:To adjust the resistance due to the viscous fluid charging the inside of a steering casing in which a steering shaft passes according to the traveling condition and improve the stability in the steering operation under a variety of traveling conditions. CONSTITUTION:Inside a sealed space 31 which is dividedly formed in a steering casing 3 in which a steering shaft 2 passes, a movable disc 34 which integrally revolves with the steering shaft 2 and a standstill disc 33 which is held on the steering casing 3 are lamination-arranged alternately, and an inside sealed space condition adjusting means 35 for changing at least one between the viscous fluid pressure in the sealed space 31 and the distance between the contiguous discs 33 and 34 is installed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steering stabilizing device for a prime mover vehicle for stabilizing a steering wheel of a prime mover vehicle such as a two-wheeled vehicle or a three-wheeled vehicle.

[0002]

2. Description of the Related Art In a motor vehicle such as a two-wheeled vehicle or a three-wheeled vehicle, for example, when traveling on a rough land, an impact is often applied to the front wheels due to obstacles or terrain. As a result, the stability of the steering operation is reduced. Further, a vehicle body structure in which a front fork, which is a support means of the steered wheels, has a small forward inclination (angle with respect to a line perpendicular to the ground) is compared with a vehicle body structure in which the steered wheels have a large forward inclination. While it is possible to perform a swift turning operation of the steered wheels, the stability of the steering operation tends to be reduced, such as the straight-line stability generally being lowered.

In order to prevent the above-mentioned deterioration in the stability of the steering operation, there has been conventionally proposed a steering stabilization device which utilizes a hydraulic piston to reduce the impact acting on the steering wheel (for example, Japanese Unexamined Patent Application Publication No. 2003-242242). Technology disclosed in Japanese Patent Laid-Open No. 61-139578). However, a conventional steering stabilizing device using a hydraulic piston is equipped with a hydraulic piston that suppresses easy turning of the steering wheel between a steering shaft to which a steering wheel is fixed and a frame that rotatably supports the steering shaft. However, since the screw, hydraulic piston, and throttle passage through which hydraulic oil flows are indispensable components, the structure is complicated and there are problems that the number of types of parts tends to be expensive and the hydraulic piston is difficult to steer. There was a problem that the size of the vehicle was increased by protruding around the shaft.

Therefore, in order to solve such a problem, a steering stabilizing device 1 as shown in FIGS. 5 to 8 has been proposed. The steering stabilizing device 1 shown here is disclosed in Japanese Patent Application Laid-Open No. 63-306993, and has a steering shaft 2 to which a handle of a two-wheeled vehicle is connected, and a tubular shape which rotatably supports the steering shaft 2. It is provided in a cylindrical space 4 between the steering casing 3.

More specifically, as shown in FIG. 5, a front wheel 5 of a motorcycle is suspended by a front fork 6 which is a shock absorber, and a top bridge 7 and a bottom bridge 8 are provided on the upper end side of the front fork 6. Are fixed, and both ends of the steering shaft 2 are fixed to the pair of bridges 7 and 8. The top bridge 7
Though not shown, also serves as a support metal fitting for the handle. Also, in the front part of the frame 10 on which the engine 9 is mounted,
The steering shaft 2 is located between the pair of bridges 7 and 8.
It is equipped with the steering casing 3 through which is inserted.
The steering casing 3 rotatably supports the steering shaft 2 via rolling bearings 11 and 12, and the front wheel 5 is steered by a rotating operation of the steering shaft 2 via a handle.

As shown in FIG. 6, the steering stabilizing device 1 engraves an external tooth spline 14 on the outer periphery of the lower end side of the steering shaft 2 which is inserted through the steering casing 3.
Internal tooth splines 15 are engraved on the inner peripheral portion of the steering casing 3 facing the external tooth splines 14, and sealing rings 17, 18 are provided on the upper and lower ends of the internal tooth splines 15, as shown in FIG. A cylindrical space surrounded by the external tooth spline 14 and the internal tooth spline 15 is provided as an enclosed space 19 for viscous fluid. Then, in the enclosed space 19, a stationary disc 22 shown in FIG.
A plurality of movable discs 24 shown in FIG. 8B are alternately mounted.

As shown in the drawing, the stationary disc 22 has outer teeth 20 formed on the outer periphery thereof to be fitted to the inner tooth splines 15, and a shaft through which the steering shaft 2 is rotatably inserted. A donut-shaped disk having the insertion holes 25 formed therein, and fluid insertion holes 26 are formed at appropriate intervals. On the other hand, the movable disc 24 is a donut-shaped disc having an inner tooth 23 formed in the central portion and fitted to the outer tooth spline 14 and having an outer diameter smaller than the inner diameter of the inner tooth spline 15. The fluid insertion holes 27 are formed at appropriate intervals.

The movable range of the plurality of stationary discs 22 and the movable disc 24 provided in the enclosed space 19 is limited by a pair of upper and lower retaining rings 28 and 29 engaged with the steering shaft 2. There is. The external tooth spline 14
As shown in FIG. 6, each of the plurality of movable discs 24 is tapered and fits on the external tooth spline 14.
The pitch circle diameter of the internal teeth 23 is gradually changed so that the internal teeth 23 are locked on the external spline 14 at regular intervals.

[0009]

In the conventional steering stabilizing device 1 shown in FIG. 5 to FIG. 8 described above, when the steering shaft 2 turns, the viscous fluid enclosed in the enclosed space 19 causes the steering shaft 2 to rotate. 2 and a stationary disk 22 that is locked to the steering casing 3.
A viscous resistance is generated between the steering wheel 2 and the steering wheel 2, and this viscous resistance produces a buffering effect against the shock transmitted from the front wheels 5 to the steering shaft 2 and an effect of attenuating the turning force of the steering shaft 2. It is suppressed and the stability of the steering operation is improved. Then, a viscous fluid, a movable disc 24 that rotates integrally with the steering shaft 2, and a stationary disc 22 that is mounted on the steering casing 3 are provided in an enclosed space 19 defined in the steering casing 3. Therefore, as compared with the conventional case where the hydraulic piston is used, the configuration is simplified and the product cost can be reduced, and the parts such as the hydraulic piston that greatly protrudes to the outside of the steering casing 3 are unnecessary, It is possible to obtain effects such as making the vehicle dimensions compact.

By the way, the stability of the steering operation varies depending on the weight of the driver, the road surface condition of the running place, the running conditions such as the running speed. In other words, it is preferable that the steering stabilizing device mounted on the two-wheeled vehicle or the like can adjust the effect of suppressing the turning of the steering shaft 2 according to the traveling conditions and the like.

However, in the case of the conventional steering stabilizing device shown in FIG. 5 to FIG. 8, the effect of suppressing the turning of the steering shaft cannot be adjusted according to the traveling conditions, etc. There is a possibility that the effect will not be obtained.

Therefore, an object of the present invention is to solve the above-mentioned problems, and a viscous fluid and the steering shaft are spline-fitted into the enclosed space defined in the steering casing through which the steering shaft is inserted. A viscous resistance that acts between the movable disk and the stationary disk when the steering shaft turns, by enclosing a movable disk that rotates integrally with the shaft and a stationary disk that is spline-fitted on the steering casing side. A steering stabilizing device for a prime mover vehicle that improves the stability of the steering operation by means of which the viscous resistance acting between the stationary disk and the movable disk can be adjusted in accordance with the running conditions. It is an object of the present invention to provide a steering stabilizing device for a prime mover vehicle, which can flexibly improve the stability of steering operation under various driving conditions.

[0013]

The above object of the present invention is to provide a viscous fluid and a steering shaft by spline-fitting the viscous fluid in the enclosed space defined in the steering casing through which the steering shaft is inserted. A movable disk that rotates integrally and a stationary disk that is spline-fitted to the steering casing are enclosed, and by viscous resistance that acts between the movable disk and the stationary disk when the steering shaft turns. A steering stabilization device for a prime mover vehicle that improves the stability of steering operation,
In the enclosed space, the stationary disc and the movable disc are alternately laminated, and at least one of the viscous fluid pressure in the enclosed space and the interval between the adjacent discs is set. This is achieved by a steering stabilizing device for a prime mover vehicle, which is equipped with a condition adjusting means for changing the enclosed space.

The above object of the present invention is to equip the above-mentioned condition adjusting means in the enclosed space in the steering stabilizing device for a prime mover vehicle so that one wall defining the enclosed space can be displaced along the steering shaft. A steering stabilizing device for a prime mover vehicle, characterized in that the viscous fluid pressure in the enclosed space and the interval between the adjacent disks are changed by displacing the one wall portion along the steering axis. Achieved by

The above object of the present invention is to equip the stationary disk or the movable disk in the steering stabilizer for a motor vehicle described above with a spacer for restricting the distance between adjacent disks and the spacer. Is formed by an elastic material, which is achieved by a steering stabilizing device for a prime mover vehicle.

The above object of the present invention is to provide a cylinder for providing a viscous fluid chamber communicating with the enclosed space by the condition adjusting means in the enclosed space in the steering stabilizing device for a prime mover vehicle, and a forward / backward operation in the cylinder. A steering stabilizer for a prime mover vehicle, characterized in that the viscous fluid pressure in the enclosed space is changed by changing the volume of the viscous fluid chamber by advancing and retracting the piston. To be achieved.

[0017]

According to the above construction of the present invention, at least one of the viscous fluid pressure in the enclosed space and the interval between the discs adjacent to each other can be changed by the condition adjusting means in the enclosed space. If the viscous fluid pressure is changed or the distance between the discs adjacent to each other is changed, the viscous resistance acting between the movable disc and the stationary disc changes when the steering shaft turns accordingly. Then, the effect of suppressing the turning of the steering shaft changes.

Accordingly, the viscous fluid pressure in the enclosed space or the space between the discs adjacent to each other is adjusted by the in-enclosed space condition adjusting means in accordance with the weight of the driver, the road surface condition of the running place, and the running conditions such as running speed. By changing the interval of, it becomes possible to obtain the turning suppression effect of the steering shaft that matches the driving condition, and the stability of the steering operation is improved under various driving conditions flexibly according to the driving conditions. Can be achieved.

Further, as means for adjusting the condition in the enclosed space, a means for changing the viscous fluid pressure in the enclosed space, or a means for changing both the viscous fluid pressure in the enclosed space and the interval between adjacent discs, etc. By preparing a plurality of types, it becomes possible to expand or finely adjust the adjustment range of the viscous resistance generated when the steering shaft turns.

[0020]

1 shows an embodiment of a steering stabilizing device 30 for a motor vehicle according to the present invention. As shown in FIG. 2 and FIG. 3, the steering stabilizing device 30 of this embodiment is capable of rotating the steering shaft 2 to which a steering wheel of a motorcycle is connected and the steering shaft 2 for the purpose of improving the stability of the steering operation. It is mounted in a tubular space 4 between the tubular steering casing 3 and the steering casing 3 which is supported by the. As shown in FIG. 2, the front wheel 5 of the motorcycle is suspended by a front fork 6 which is a shock absorber, and a top bridge 7 and a bottom bridge 8 are fixed to the upper end side of the front fork 6. Both ends of the steering shaft 2 are fixed to the pair of bridges 7 and 8. The top bridge 7 is
Although not shown, it also serves as a support metal fitting for the handle.
Further, the steering casing 3 which is located between the pair of bridges 7 and 8 and through which the steering shaft 2 is inserted is equipped at the front portion of the frame 10 on which the engine 9 is mounted. The steering casing 3 rotatably supports the steering shaft 2 via rolling bearings 11 and 12, and the front wheel 5 is steered by a rotating operation of the steering shaft 2 via a handle.

Hereinafter, the steering stabilizing device 30 of one embodiment will be described in detail with reference to FIG. The steering stabilizing device 30 according to the embodiment includes the enclosed space 3 in the space 4 of the steering casing 3.
In order to realize the change of the viscous fluid pressure inside the enclosure 32 and the stationary disc 33 and the movable disc 34 mounted in the enclosure space 31, the enclosure 32 defining 1 is realized. It is configured to include a condition adjusting means 35 in the enclosed space. Although the stationary disc 33 and the movable disc 34 are shown only above the enclosed space 31 for the sake of convenience in the figure, they are actually provided over the entire enclosed space 31. The enclosing container 32 defines the enclosing space 31 in a ring shape that surrounds the steering shaft 2, and has a cylindrical outer peripheral wall portion 38 that surrounds the outer periphery of the enclosing space 31.
An inner peripheral wall 39 surrounding the inner peripheral side of the enclosed space 31 and the enclosed space 3
1 is fixed to the lower wall portion 40 serving as the bottom portion, the upper wall portion 41 serving as the ceiling portion of the enclosed space 31, and the upper end portion of the outer peripheral wall portion 38, and the enclosed space condition adjusting means 35 is provided in the enclosed container 3
A lid member 42 that functions as a mounting bracket to be attached to the 2
It is configured to include and.

Here, the outer peripheral wall portion 38 is a spline 44 formed on the inner peripheral portion of the lower end of the steering casing 3.
A locking tooth 45 that fits with is formed on the outer periphery of the lower end, and an internal thread portion 47 with which the upper wall portion 41 is screwed is formed on the inner peripheral portion on the upper end side. An inner tooth spline 48 into which the stationary disk 33 is fitted is engraved on the inner peripheral portion on the side. The inner peripheral wall 39 is formed with locking teeth 51 that fit into splines 50 engraved on the outer periphery of the steering shaft 2 on the inner peripheral portion, and the movable disk 34 fits on the outer peripheral portion. The external tooth spline 52 is formed.

In the case of this embodiment, the internal tooth spline 48 with which the stationary disk 33 is fitted and the external tooth spline 52 with which the movable disk 34 is fitted are both linear with no change in pitch circle. The discs 33 and 34 fitted to these splines 48 and 52 are movable in the axial direction of the steering shaft 2 unless they come into close contact with the adjacent discs. The lower wall portion 40 is attached to the outer peripheral wall portion 3 by a fastening member such as a screw.
The lower plate portion 54 is airtightly fixed to the lower end of the lower plate portion 8, and a cylindrical portion 55 that protrudes upward from the central portion of the lower plate portion 54. The cylindrical portion 55 has the inner peripheral wall 39.
Is rotatably fitted in the gap between the lower end side cylindrical portion of the inner peripheral wall 39 and the steering shaft 2, and the lower wall portion 40 and the inner peripheral wall 39 are sealed by a seal ring 56 mounted on the lower end side cylindrical portion of the inner peripheral wall 39.
The sealability between and is secured.

The upper wall portion 41 has a male screw portion 58 which is screwed into the female screw portion 47 on the outer periphery on the upper end side, and protrudes into the enclosed space 31 and projects into the enclosed space 31 on the lower end side. A disc holding portion 59 for regulating the upper end positions of the mounted discs 33, 34 is provided, and inner teeth 60 meshing with the splines are formed on the inner peripheral portion on the upper end side. Further, the upper wall portion 41 has the outer peripheral wall portion 38 on the outer peripheral portion on the lower side of the female screw portion 47.
A seal ring 62, which is in close contact with the inner peripheral surface of the inner peripheral surface of the outer peripheral wall 38 and the upper wall 41, is attached, and the inner peripheral portion of the lower side of the inner tooth 60 is Inner wall 3
9 is provided with a seal ring 63 for ensuring a sealing property between the upper wall portion 41.

The stationary disc 33 corresponds to the stationary disc 22 shown in FIG. 8A, and is of a donut type having external teeth formed on the outer peripheral portion for fitting with the internal tooth splines 48. Presents. The movable disc 34 corresponds to the movable disc 24 shown in FIG. 8B, and has a donut shape in which inner teeth for fitting the outer tooth splines 52 are formed on the inner peripheral portion. There is. However, on the outer peripheral portion of the movable disc 34, a spacer 6 that regulates the distance between the adjacent discs 33 and 34 is provided.
5 is equipped. And this spacer 65 is
For example, it is made of a material that is easily elastically deformed, such as synthetic rubber, and makes the intervals between the stationary discs 33 uniform, and when the discs are moved by being pushed by the disc pressing portion 59 or when the pressing is released, the circles are circled. It has the effect of widening the distance between the plates. An appropriate number of stationary disks 33 and movable disks 34 are mounted according to the space in the enclosed space 31 so as to be laminated alternately.

With the above construction, the movable disk 34 is
It is spline-fitted to the steering shaft 2 via the inner peripheral wall 39 and rotates integrally with the steering shaft 2. Further, the stationary disc 33 is spline-fitted to the steering casing 3 via the outer peripheral wall portion 38, and is held on the steering casing 3 side. Therefore, when the steering shaft 2 rotates, relative rotation occurs between the stationary disk 33 and the movable disk 34, and the viscous fluid filled between the stationary disk 33 and the movable disk 34 is generated. By these discs 33, 34
The viscous resistance acting in between produces the effect of suppressing the turning of the steering shaft 2 and prevents the easy rotation of the steering shaft 2,
Improves stability of steering operation.

The enclosed space condition adjusting means 35 includes a bevel gear 67 rotatably held at a fixed position on the steering shaft 2 by the lid member 42, and a bevel gear 68 meshing with the bevel gear 67. The bevel gear 68 is connected to the steering casing 3
And a rotary operation panel 69 for rotating the external operation of the rotary operation panel 69. When the rotary operation panel 69 is rotated, the bevel gear 67 is rotated via the bevel gear 68 that rotates integrally with the rotary operation panel 69. It rotates around the steering shaft 2.

At the lower end of the bevel gear 67 is the upper wall 4
When the bevel gear 67 rotates, the upper wall portion 41 also rotates around the steering shaft 2 together with the bevel gear 67 when the spline 71 fitted to the inner tooth 60 of No. 1 is formed. However, since the male screw portion 58 on the outer periphery of the upper end side is screwed into the female screw portion 47 of the outer peripheral wall portion 38, the upper wall portion 41 is displaced forward and backward in the axial direction of the steering shaft 2 in accordance with the rotation. When the upper wall portion 41 is displaced in the axial direction of the steering shaft 2 by the rotation of the bevel gear 67, the volume of the enclosed space 31 is changed, and the viscous fluid pressure in the enclosed space 31 is changed. The distance between the discs 33, 34 present changes.

The change in the viscous fluid pressure in the enclosed space 31 and the change in the interval between the adjacent disks 33 and 34 are caused by the viscous resistance acting between the disks 33 and 34 when the steering shaft 2 is turned. To change the effect of suppressing the turning of the steering shaft 2. Therefore, the discs 33, 34 which are adjacent to the viscous fluid pressure in the enclosed space 31 by the enclosed space condition adjusting means 35 according to traveling conditions such as the weight of the driver, the road surface condition of the traveling place, and traveling speed. By changing the interval between the two, it is possible to obtain the turning suppression effect of the steering shaft 2 that matches the traveling conditions, and the steering operation can be stabilized under a wider variety of traveling conditions according to the traveling conditions flexibly. It is possible to achieve improvement in sex.

A viscous fluid, a movable disk 34 that rotates integrally with the steering shaft 2, and a stationary disk 33 mounted on the steering casing 3 are provided in an enclosed space 31 defined in the steering casing 3. The steering shaft 2 is equipped with a viscous resistance acting between the stationary disc 33 and the movable disc 34.
Since it is a structure that suppresses the turning of the vehicle, as in the case of the conventional one, the structure is simplified and the product cost can be reduced as compared with the conventional case where the cushioning effect of the hydraulic piston is used, and the vehicle cost can be reduced. Of course, it is possible to obtain the effect that the dimensions can be made compact.

In the above embodiment, the enclosed space condition adjusting means 35 simultaneously changes both the viscous fluid pressure in the enclosed space 31 and the space between the disks 33 and 34 adjacent to each other. However, the enclosed space condition adjusting means 35 is configured to change only one of the viscous fluid pressure in the enclosed space 31 and the interval between the disks 33 and 34 adjacent to each other. It may be.

Next, FIG. 4 shows another embodiment of the present invention.
The steering stabilizing device 76 equipped with a second enclosed space condition adjusting means 75 for changing only the viscous fluid pressure in the enclosed space 31 is shown in addition to the device of one embodiment described above. Descriptions of parts common to those of the first embodiment will be omitted, and hereinafter, the second enclosed space condition adjusting means 75 will be described.
Will be described in detail.

Condition adjusting means 75 for the second enclosed space
Includes a cylinder 78 that provides a viscous fluid chamber 77 that communicates with the enclosed space 31, and a piston 79 that can be moved forward and backward in the cylinder 78, and the volume of the viscous fluid chamber 77 can be changed by moving the piston 79 forward and backward. Is changed to change the viscous fluid pressure in the enclosed space 31.

The steering casing 3 and the outer peripheral wall portion 38 are provided to connect the enclosed space 31 and the viscous fluid chamber 77.
In the communication passage 80 passing through, the seal member 82 press-fitted between the steering casing 3 and the outer peripheral wall portion 38 prevents leakage in the gap between the steering casing 3 and the outer peripheral wall portion 38. Further, the piston 79 has a rotation operating portion 84 fixed to an end portion of a piston rod 83 screwed to the cylinder 78 so as to be airtight and capable of advancing and retracting.
When the rotation operating portion 84 is rotated, the piston rod 83 screwed into the cylinder 78 moves back and forth in the rod axial direction according to the rotation amount, and the viscous fluid in the viscous fluid chamber 77 and the enclosed space 31 is added. Pressure or pressure reduction is performed, and the viscous resistance acting between the disks 33 and 34 is changed by this pressure or pressure reduction.

In addition, in the other embodiment, the condition adjusting means 35 in the enclosed space is used together with the condition adjusting means 35 in the embodiment, but the condition adjusting means 35 in the enclosed space is omitted, and the second embodiment is adopted. It is also possible to realize the adjustment of the viscous resistance only by the condition adjusting means 75 in the enclosed space. However, as the condition adjusting means in the enclosed space, a plurality of types such as one that changes the viscous fluid pressure in the enclosed space, or one that changes both the viscous fluid pressure in the enclosed space and the interval between the adjacent disks are used. It is expected that if the above items are prepared, the adjustment range of the viscous resistance generated when the steering shaft 2 is turned and the fine adjustment can be further facilitated.

In the above embodiments, the structure in which the liquid pressure of the viscous fluid changes has been described, but in the present invention,
For example, the second enclosed space condition adjusting means 75 shown in FIG.
Alternatively, an accumulator may be appropriately provided to form a retreat area for the viscous fluid that accompanies a change in the volume of the enclosed space 31 when the distance between the disks is changed, thereby maintaining a constant hydraulic pressure. it can. Further, in the above-described embodiment, the spacer 65 that regulates the distance between the adjacent disks 33 and 34 in the enclosed space 31 is arranged between the stationary disks 33. It may be arranged at.

[0037]

According to the steering stabilizing device for a prime mover of the present invention, at least one of the viscous fluid pressure in the enclosed space and the interval between the adjacent discs can be changed by the enclosed space condition adjusting means. If the viscous fluid pressure in the enclosed space is changed or the distance between the discs adjacent to each other is changed, the space between the movable disc and the stationary disc is accordingly changed when the steering shaft is turned. The acting viscous resistance changes, and the effect of suppressing the turning of the steering shaft is changed. Therefore, the viscous fluid pressure in the enclosed space or the space between the adjacent discs is adjusted by the in-enclosed space condition adjusting means according to the traveling condition such as the weight of the driver, the road surface condition of the traveling place, and the traveling speed. By changing it, it is possible to obtain the turning suppression effect of the steering shaft that matches the driving conditions, and achieve the stability of the steering operation under various driving conditions flexibly according to the driving conditions. It will be possible. Further, as the condition adjusting means in the enclosed space, a plurality of types such as one that changes the viscous fluid pressure in the enclosed space, or one that changes both the viscous fluid pressure in the enclosed space and the interval between adjacent disks are used. It is also possible to further expand the fine adjustment range and increase the adjustment range of the viscous resistance generated when the steering shaft turns, by preparing the above item. Further, a viscous fluid, a movable disk that rotates integrally with the steering shaft, and a stationary disk that is mounted on the steering casing are provided in an enclosed space defined in the steering casing through which the steering shaft is inserted. Since the viscous resistance acting between the stationary disk and the movable disk suppresses the turning of the steering shaft, it is compared with the conventional case that uses the buffer effect of the hydraulic piston, as in the conventional case. Then,
It goes without saying that the configuration is simplified, the product cost can be reduced, and the vehicle dimensions can be made compact.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the present invention.

FIG. 2 is a schematic view showing an application part of an embodiment of the present invention.

FIG. 3 is a perspective view showing an appearance of an embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view of another embodiment of the present invention.

FIG. 5 is an explanatory diagram of an application example of a conventional steering stabilizing device for a prime mover vehicle.

FIG. 6 is a perspective view showing an external appearance of a conventional steering stabilizing device for a prime mover vehicle.

FIG. 7 is a vertical cross-sectional view of a conventional steering stabilizing device for a prime mover vehicle.

FIG. 8 is a plan view of constituent members of a conventional steering stabilizing device for a prime mover vehicle.

[Explanation of symbols]

 2 Steering shaft 3 Steering casing 4 Space 30,76 Steering stabilizer 31 Enclosed space 32 Enclosed container 33 Stationary disc 34 Movable disc 35,75 Enclosed space condition adjusting means 38 Outer peripheral wall 39 Inner peripheral wall 40 Lower wall 41 Upper Wall portion 42 Lid member 44, 50, 71 Spline 45, 51 Locking tooth 48 Internal tooth spline 52 External tooth spline 65 Spacer 67, 68 Bevel gear 69 Rotating operation panel 77 Viscous fluid chamber 78 Cylinder 79 Piston 80 Communication passage 83 Piston rod

Claims (4)

[Claims] 1. A viscous fluid, a movable disc that is spline-fitted to the steering shaft and rotates integrally with the steering shaft, in a sealed space defined in a steering casing through which the steering shaft is inserted. A stationary motor disk that encloses a stationary disk that is spline-fitted in a casing and that improves the stability of the steering operation by viscous resistance that acts between the movable disk and the stationary disk when the steering shaft turns. A steering stabilizing device, wherein the stationary disks and the movable disks are alternately stacked in the enclosed space, and the viscous fluid pressure in the enclosed space and the space between the adjacent disks are set. A steering stabilizing device for a prime mover, which is equipped with a condition adjusting means in an enclosed space for changing at least one of a space and a space. 2. The condition adjusting means in the enclosed space is configured such that one wall portion defining the enclosed space is displaceable along the steering shaft, and the one wall portion is displaced along the steering shaft. The steering stabilization device for a motor vehicle according to claim 1, wherein the viscous fluid pressure in the enclosed space and the interval between the adjacent disks are changed by changing the pressure. 3. The stationary disk or the movable disk is equipped with a spacer that regulates a gap between adjacent disks, and the spacer is formed of an elastic material. The steering stabilization device for a prime mover vehicle according to claim 1 or 2. 4. The enclosed space condition adjusting means includes a cylinder that provides a viscous fluid chamber that communicates with the enclosed space, and a piston that can be moved back and forth in the cylinder, and the piston can be moved forward and backward by the operation. The steering stabilization device for a motor vehicle according to claim 1, wherein the viscous fluid pressure in the enclosed space is changed by changing the volume of the viscous fluid chamber.