JPH0526052B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rotary actuator for controlling a rotation angle that controls the position of a set angle, for example, a suspension system that controls the damping force of a vehicle in three stages. This relates to the rotary actuator that switches the oil passage in the shock absorber of
In particular, any three
The present invention relates to a rotary actuator for rotational angle control that can be accurately stopped at set positions of stages.

[Prior Art] A conventional rotary actuator for three-stage rotation angle setting in a suspension system that controls the damping force in three stages of this type of vehicle detects the rotation angle with a rotation angle sensor, and then detects the rotation angle. A method of applying feedback to the feedback system and stopping the rotation of the output shaft for damping force setting at a set stop position, and a method of turning off the power to the DC motor at an arbitrary time and forcing it to the set position with a mechanical stopper. The rotation of the damping force setting output shaft is stopped by a method of stopping the damping force setting output shaft.

[Problems to be solved by the invention] After detecting the angle with the former rotation angle sensor,
In a device that turns off the power by feeding back the detected value, it takes a long time to stop at a set angle due to the inertia of the rotating part, and there is a problem that the response speed is not good. Further, in a device that forcibly stops at a stop position set by a mechanical stopper, there are problems with control of the power source of the electric motor, the timing at which the stopper engages, and the engagement of the stopper.

For example, as a means for mechanically stopping the rotation at a set position, a means for mechanically stopping the rotation at an arbitrary set position is used, as shown in the principle diagram of a rotary actuator for rotational angle control shown in FIG.

In the figure, an output shaft 1 connected to a load rotates a DC motor (not shown) whose rotation is reduced by a reduction gear 2. As shown in FIG. Stopper plate 3
is screwed onto the end of the output shaft 1 with a nut 4.
The stopper plate 3 has an engagement hole 3a for a plunger stopper 6, and is arranged so that the plunger stopper 6, which moves up and down by the force of a solenoid 5 at a set position, fits therein. .

This type of means for mechanically stopping rotation at a set position is to engage the plunger stopper 6 with the engagement hole 3a when the output shaft 1 rotates, that is, when the stopper plate 3 rotates. , due to a timing delay of the solenoid 5 or a change in the contact resistance of the plunger stopper 6, the engagement hole 3
If there is a delay in the timing of descending to side a, even if the power to the motor that rotates the output shaft 1 is cut off, the engagement hole 3a of the stopper plate 3 and the plunger stopper 6 will not connect due to its inertia. There were problems such as cases in which engagement could not be achieved.

In addition, usually, in consideration of the case where the engagement hole 3a and the plunger stopper 6 cannot be engaged, the plunger stopper 6 is inserted into the stopper plate 3 immediately before engaging with the engagement hole 3a. As a result, contact resistance increases due to wear around the engagement hole 3a of the stopper plate 3 or roughness of the surface, and the plunger stopper 6
However, there was a problem in that the stopper plate 3 was stopped before it was engaged with the engagement hole 3a.

In order to solve this problem, a plunger stopper that moves linearly and a stopper member having a convex portion that comes into contact with the plunger stopper to stop rotation of the output shaft are provided. By providing play in the engagement with the output shaft to absorb the difference between the position that restricts counterclockwise rotation and the position that restricts clockwise rotation, the contact between the convex portion of the stopper member and the plunger stopper is improved. The resulting stop position of the output shaft is always set to a predetermined intermediate stop position regardless of the left and right rotation direction, and the counter gear contacts the end stopper of the housing to reach the left and right rotation limits of the output shaft. A rotary actuator for rotational angle control can be considered using a three-stage control method in which the set stop position is set at the set stop position.

Alternatively, a main gear that transmits left rotation and right rotation to an output shaft, a stopper plate rotatably attached to the main gear concentrically, a protrusion disposed on the stopper plate, and the protrusion a plunger stopper disposed so as to be able to come into contact with the plunger plate; and a recessed part provided in the main gear and allowing the main gear and the stopper plate to rotate relative to each other by a predetermined amount. A rotary actuator for angle control is considered.

Each of the above technologies uses a pinion attached to the motor shaft to transmit the rotation of the motor to the output shaft via the main gear, and outputs the torque from the pinion attached to the motor shaft. A stopper plate is attached to the speed reduction mechanism that is transmitted to the shaft, and a plunger stopper is further arranged around the stopper plate.

However, with the above configuration, the diameter of the entire rotary actuator for controlling the rotation angle expands in the radial direction of the output shaft, making it impossible to fit it into a size that can be stored in the shock absorber. It was hot.

Therefore, it is usually disposed at the upper end of the shock absorber, for example, above the absorber piston rod, and is used externally to the shock absorber.

When the rotary actuator for rotation angle control is attached externally to the shock absorber, the attachment between the suspension system's absorber piston rod, the shock absorber outer shell, and the upper stay and lower stay on the vehicle body side is attached externally. If the rotation angle control rotary actuator is restricted or an external force is applied to the rotation angle control rotary actuator, the rotation angle control rotary actuator that is axially connected to the absorber piston rod will be damaged. It is predicted that distortion will occur between the rotary actuator and the output shaft, and the load on the rotary actuator for controlling the rotation angle will increase, resulting in control difficulties.

In addition, if a rotary actuator for rotation angle control is built into the absorber piston rod,
Since the rotary actuator for rotational angle control must be assembled within a limited space, there are problems such as poor assembly performance.

Therefore, in order to solve the above-mentioned problems, the present invention incorporates a rotary actuator for controlling the rotation angle inside the absorber piston rod, which improves the ease of assembly, and allows the motor to stop rotating accurately.
Further, it is an object of the present invention to provide a rotary actuator for controlling the rotation angle, which is a mechanism that can be easily performed.

[Means for solving the problem] In a suspension system in which the oil passage in the shock absorber is switched by an orifice of a rotary valve and the damping force is controlled in three stages: "high", "medium" and "low", the above-mentioned A DC motor with drive shafts at both ends of its rotating shaft is attached to a roughly elongated cylindrical housing inserted into the shock absorber piston rod that constitutes the shock absorber, and a DC motor is mounted on one end of the rotating shaft of the DC motor. a deceleration mechanism for rotating the rotary valve provided therein; left and right rotation limit regulating means for the rotary valve incorporated in the deceleration mechanism; and a stopper plate provided at the other end of the rotating shaft of the DC motor. is arranged on the stopper plate side of the DC motor, and absorbs the difference between a position where clockwise rotation is restricted and a position where counterclockwise rotation is restricted at an intermediate stop position of the rotary actuator. It is constructed by incorporating a plunger stopper etc. equipped with a mechanism.

[Operation] By inserting the shock absorber into the shock absorber piston rod that constitutes the shock absorber and rotating the DC motor built into the approximately elongated cylindrical housing, the reduction mechanism installed on one of the rotating shafts of the DC motor The rotation of the DC motor is decelerated to rotate the rotary valve. By rotating the rotary valve, the type of oil passage in the shock absorber is switched by the orifice of the rotary valve, and the deceleration force is controlled in three stages: "high", "medium", and "low".

At this time, the left and right rotation limit regulation of the rotary valve, that is, ``medium'' and ``low'' is determined from the fitting hole and stopper pin drilled in the main gear for the rotary valve provided in the reduction mechanism that rotates the rotary valve. The intermediate stop position of the rotary valve is set by means of left and right rotation limit regulating means, and the rotary valve is brought into contact with a stopper plate whose rotational speed is reduced by a speed reduction mechanism disposed on the other side of the rotating shaft of the DC motor. When the plunger stopper is equipped with a mechanism that absorbs the difference between the position that restricts clockwise rotation and the position that restricts counterclockwise rotation, and the plunger stops at an intermediate position when rotated clockwise, or when it stops at an intermediate position when rotated counterclockwise. The "high" position is being determined. At this time, the rotation of the DC motor is reduced by a speed reduction mechanism to rotate the stopper plate, and sufficient timing can be obtained to operate the plunger stopper and bring it into contact with the stopper plate. Further, the degree of freedom in designing a mechanism for absorbing the difference between the position where clockwise rotation is restricted and the position where counterclockwise rotation is restricted by the reduction ratio is increased.

[Example] Fig. 1 is a sectional view of the main part showing an embodiment of the rotary actuator for controlling the rotation angle of the present invention, and Fig. 2 shows the rotary actuator for controlling the rotation angle of the embodiment of the present invention as a shock absorber. FIG. 3 is a sectional view showing the state in which the piston rod is installed inside the piston rod. Figures 3 to 6 are diagrams based on the cutting line in Figure 2, and Figure 3 is the reduction gear of the main gear for the rotary valve when cut along the Y1-Y1 cutting line in Figure 2. An explanatory diagram showing the relationship between the shaft and the stopper pin, Fig. 4 is an explanatory diagram of the bracket that presses the main gear for the rotary valve when cut along the Y2-Y2 cutting line in Fig. 2, and Fig. 5 is an explanatory diagram showing the relationship between the shaft and the stopper pin. Y
FIG. 6 is an explanatory view of the stopper and stopper plate for the mounting member when cut along the 3-Y3 cutting line, and FIG. 6 is an explanatory view of the lead wire extraction when cut along the Y4-Y4 cutting line in FIG. Also, Figures 7 to 8 are diagrams based on the cutting line in Figure 1, and Figure 7 is an explanation showing the switching state of the rotary valve when cutting along the X1-X1 cutting line in Figure 1. 8 are explanatory diagrams showing the operating state of the stopper plate and stopper pin when cut along the X2-X2 cutting line in FIG. 1.

In the figure, the lower end of the shock absorber outer shell 11 has a lower joint 12 that is attached to the axle with a lower stay. While the lower nut bolt joint 12 is attached to the axle, an upper nut bolt joint is attached to the frame by an upper stay at the upper part of the shock absorber piston rod 10. A spring is interposed between the frame and the axle, and the shock absorber and spring constitute a suspension system.

The shock absorber outer shell 11 has an inner cylinder 13 inside.
A known base valve assembly (not shown) is provided at the lower end of the inner cylinder 13. A valve rod 19 is attached to the lower end of the absorber piston rod 10, and a piston rod valve assembly 14 is provided below the valve rod 19.

A rotary valve 16 is inserted into the inside of the valve rod 19, and its upper end is connected to a rotary valve main gear 35 which becomes an output shaft of a rotary actuator for controlling a rotation angle, which will be described later.
It is connected to a control rod 15 which is integrally formed with the control rod 15. Therefore, the rotation of the rotary valve main gear 35 of the rotation angle control rotary actuator appears as rotation of the rotary valve 16.

The piston rod valve assembly 14 includes
A large diameter oil passage 17 that passes oil from the bottom to the top of the piston rod valve assembly 14 during bounce, and a small diameter oil passage 18 that passes oil from the top to bottom of the piston rod valve assembly 14 during rebound. It has Furthermore, orifice A, orifice B, and orifice C are used to open and close the bypass passage for the oil that has passed through the piston rod valve assembly 14 in multiple stages such as "high,""middle," and "low" at the top of the rotary valve 16. Three types of orifices are drilled in three stages (Fig. 7 shows a cross section of orifice A, orifice B, and orifice C).

As shown in Fig. 7, orifice A, orifice B, and orifice C are bored in the valve rod 19 in a straight line passing through its center, and the diameters of each are set in the relationship of orifice A > orifice B > orifice C. There is. Rotary valve 16
Also, an orifice 16a is bored in a straight line passing through the center, and the diameter of the orifice 16a is as follows.
The diameter of the orifice A is larger than that of the orifice A.
In addition, the other two stages of orifice A, orifice B,
The orifice C also has the same cutting surface as in FIG. In other words, there are three stages of orifice A,
The reason why orifice B and orifice C are bored is to obtain the necessary diameter size as a bypass passage for each orifice. Therefore, when carrying out the present invention, it is not necessary to provide orifices in three stages.

The selection of orifice A, orifice B, and orifice C of the same diameter in each stage drilled in three stages in the valve rod 19 is to change the area of the oil bypass passage together with the orifice 16a of the rotary valve 16. Therefore, the damping force of the shock absorber of the suspension system can be selected.

Note that the "high" damping force of the shock absorber of the suspension system is the one that makes the damping force of the shock absorber of the suspension system the highest. Similarly, the above-mentioned "low" means that the damping force of the shock absorber of the suspension system is made the lowest. And the above-mentioned "middle"
The damping force of the shock absorber of the suspension system is set to be intermediate between the "high" and "low" damping forces.

Next, the configuration of the rotary actuator for controlling the rotation angle according to the embodiment of the present invention, which drives the rotary valve main gear 35 formed integrally with the control rod 15 that rotates the rotary valve 16, will be described in detail. .

The rotation angle control rotary actuator includes a reduction mechanism for rotating a rotary valve 16 disposed at a lower end 30a of a rotating shaft of a DC motor 30 housed in a substantially elongated cylindrical housing 70, and The left and right rotation limit regulating means of the built-in rotary valve 16, the stopper plate 50 disposed on the upper end 30b of the rotating shaft of the DC motor via a speed reduction mechanism, and the stopper plate 50 are in contact with each other. a stopper pin 51 that stops the rotation of the DC motor; and a mechanism that absorbs the difference between a position that restricts clockwise rotation and a position that restricts counterclockwise rotation at an intermediate stop position between the left and right rotation limits of the rotary valve. and a plunger stopper.

The DC motor 30 has a rotating shaft protruding from both ends, and a pinion 31 is fixed to the lower end 30a of the rotating shaft by means such as press-fitting, and the pinion 31 meshes with a reduction gear 32. The reduction gear 32 is disposed so as to be supported by a reduction gear shaft 34 coaxial with the internal meshing pinion 33.

Both ends of the reduction gear shaft 34 are provided with bearings 43,
It is supported by a bearing 44. As shown in FIG. 3, the internal meshing pinion 33 is connected to the internal gear portion 34d of the rotary valve main gear 35.
It's meshing with each other. Then, the reduction gear shaft 34
is inserted into the through hole 35e of the rotary valve main gear 35, but the peripheral part of the through hole 35e does not come into contact with the reduction gear shaft 34 as the rotary valve main gear 35 rotates.
These systems that transmit rotation from the rotating shaft of the DC motor 30 to the rotary valve main gear 35 constitute a speed reduction mechanism.

Below the main gear 35 for the rotary valve, there is a fitting hole 3 that constitutes a left and right rotation limit regulating means.
5a is bored, and a stopper pin 36 erected in the valve rod 19 is inserted into the fitting hole 35a.
are fitted. In this embodiment, the fitting hole 35a is the rotary valve main gear 3.
When the rotary valve main gear 35 rotates 60 degrees to the right in FIG. . Further, when the rotary valve main gear 35 rotates 60 degrees to the left in FIG. 3 about the axis, the left end 35b and the stopper pin 36 come into contact, restricting the rotation of the rotary valve main gear 35. . These fitting hole portion 35a and stopper pin 36, which restrict the rotation of the rotary valve main gear 35, constitute left and right rotation limit restriction means.

A small ball 38 is fixed to the center of the rotary valve main gear 35 by welding or the like, and the small ball 38 is pressed by a bracket 37. The hydraulic pressure received by the rotary valve 16 is applied via the control rod 15 to resist the force that lifts the rotary valve main gear 35 upward. Main gear 3 for the rotary valve
5 is formed integrally with a control rod 15, and the control rod 15 is inserted into the center of the valve rod 19, and the bearing 40 is inserted into the center of the valve rod 19.
It is rotatably attached by. Furthermore,
The rotary valve 1 is connected around the valve rod 19 by an O-ring 41 and a valve bush 42.
6 and the valve rod 19 is prevented from leaking toward the rotary valve main gear 35 due to its pressure. A convex portion at the lower end of the control rod 15 engages with a groove portion at the upper end of the rotary valve 16 to transmit rotation of the control rod 15 to the rotary valve 16. The rotary valve 16 is inserted into the center of the valve rod 19, and is attached by a valve bush 45 so that the rotary valve 16 can rotate freely and not come off. In this way, orifice A, orifice B, orifice C of valve rod 19 and orifice 1 of rotary valve 16 are
6a constitutes an oil bypass passage that controls the damping force of the suspension system in three stages: "high,""medium," and "low."

On the other hand, the upper end 30b of the rotating shaft of the DC motor 30
A deceleration mechanism for rotating the stopper plate 50 is disposed. The speed reduction mechanism is incorporated into speed reduction mechanism bases 99a and 99b.

At the upper end 30b of the rotating shaft of the DC motor 30,
A pinion 91 is fixed by means such as press fitting, and the pinion 91 meshes with a reduction gear 92. The reduction gear 92 is disposed so as to be supported by a reduction gear shaft 94 which is coaxial with an internal meshing pinion 93.

Both ends of the reduction gear shaft 94 are provided with bearings 46,
It is supported by a bearing 47. The internal meshing pinion 93 meshes with an internal gear portion 95a of a main gear 95 for a stopper. The reduction gear shaft 94 is connected to a stopper main gear 95.
However, as the stopper main gear 95 rotates, the through hole 35
The peripheral portion of b does not come into contact with the reduction gear shaft 94. These systems for transmitting rotation from the rotating shaft of the DC motor 30 to the stopper main gear 95 constitute a deceleration mechanism that rotates the stopper plate 50, and the deceleration mechanism bases 99a and 99b are connected to a substantially elongated cylindrical housing 70. It is attached so as not to move up and down or rotate by means of convex portions 70d and 70e inside the sides.

Above the main gear 95 for the stopper, a stopper shaft 96 pivotally supported by a bearing 48 is formed integrally with the main gear 95 for the stopper.
is attached by means such as press fitting. A small ball 98 is fixed to the center of the stopper main gear 95 by welding or the like, and the small ball 98 is pressed by a bracket 97.
Therefore, the stopper main gear 95 is lifted upward.

A stopper pin 51 that constitutes a plunger stopper is disposed opposite the stopper plate 50.

The plunger stopper has a stopper yoke 55, a stopper bush 56,
A core 57 is disposed, and the outer periphery of the solenoid is surrounded by a housing yoke 58 and a yoke 59 that attaches the housing yoke 58 and the stopper yoke 55 to the housing 70.
7. The housing yoke 58, yoke 59, stopper yoke 55, and plunger 60 form a magnetic path.

A plunger 60 is inserted into a stopper bush 56 disposed in the solenoid, and a stopper rod 61 is inserted into the core 57 of the plunger 60, and its upper end is inserted into the plunger 60. It's stuck in place. That is, in this embodiment, the stopper rod 61
After fitting the rod stopper 62 to the upper end of the
It is fixed by caulking the stopper rod 61.
A compression spring 63 is held between the plunger 60 and the core 57. In order to suppress the sound of the plunger 60 coming into contact with the stopper bush 56 due to the tension of the compression spring 63, a rubber plunger shaft 64 is fitted onto the plunger 60. Similarly, the solenoid is energized and the plunger 60
In order to suppress the sound of the stopper yoke 55 and the rod stopper 62 coming into contact with each other when the rod is lowered, a rubber cushion is fixed to the lower part of the rod stopper 62.

The lower end of the stopper rod 61 is connected to a stopper pin mounting member 52 to which the stopper pin 51 is fixed.
is attached by fixing means such as caulking. Further, a mounting member stopper 65 for restricting rotation of the stopper pin mounting member 52 is fixed to the housing yoke 58 by welding or the like.

The end portion of the mounting member stopper 65 rotates θ1 to the right and θ2 to the left at the right and left upright portions 65a and 65b, respectively, when viewed from below (FIG. 5). It is formed so as to come into contact with each other. Specifically, the stopper pin attachment member 52 is attached to the right standing portion 65a or the left standing portion 65.
To prevent a metallic sound from occurring when it comes into contact with b.
A rubber-based cushion is attached around its periphery (not shown).

In this way, the stopper pin attachment member 52 to which the stopper pin 51 is fixed and the attachment member stopper 65 that limits the rotation of the stopper pin attachment member 52 prevent the rotary valve 16 from rotating clockwise at the intermediate position between the left and right rotation limits. A mechanism that absorbs the difference between the position that restricts rotation and the position that restricts left rotation,
Further, a plunger stopper is constituted by a core 57 forming a magnetic path, a housing yoke 58, a yoke 59, a stopper yoke 55, a plunger 60, a stopper rod 61, a coil 54 wound around the bobbin 53, and the like.

The housing yoke 58 constituting the plunger stopper has a stopper yoke 55 at its end.
At the same time, the yoke 59 connects the housing 7 with a substantially elongated cylindrical shape.
0, and furthermore, it is mounted between the substantially elongated cylindrical housing 70 and the housing yoke 58 by convex portions 70a and 70b, etc. on the housing 70 side so as not to move vertically or rotate. (See Figures 5 and 6).

The DC motor 30 is inserted into a substantially elongated cylindrical housing 70 and attached to the housing 70 with a motor bracket 71 fixed to the DC motor 30. The end of the housing 70 is
It is engaged with the upper end of the valve rod 19.

Further, the engaged housing 70 and the valve rod 19 are inserted into the shock absorber piston rod 10, and the space between the valve rod 19 and the shock absorber piston rod 10 is sealed with an O-ring 72, and the valve rod 19 is sealed. The shock absorber piston rod 10 is tightened with a nut 73 so as to press upward, and the nut 73
The ends are caulked and fixed. Note that after inserting the housing 70 between the housing 70 and the shock absorber piston rod 10, the housing 70
It is fixed in an elastically connected state by an outer convex portion 70c formed on the outside.

And the shock absorber piston rod 1
A lead wire 80 for operating the plunger stopper and a lead wire 81 for rotating the DC motor are pulled out from the upper end of the plunger. Of course, the lead wires 80 and 81 are sealed with a lead wire bushing 82.

Next, the operation of the rotation angle control rotary actuator configured as described above will be explained.

First, the internal gear portion 35d of the rotary valve main gear 35, which is meshed with the internal meshing pinion 33, is rotated via the pinion 31 that rotates the DC motor 30 and the reduction gear 32. Therefore, the rotary valve main gear 35 rotates the rotary valve 16 via the control rod 15.

When the DC motor 30 rotates and the left end 35b of the fitting hole 35a of the rotary valve main gear 35 comes into contact with the stopper pin 36, the rotation of the rotary valve main gear 35 is stopped.
At this time, the control rod 15 integrally formed with the rotary valve main gear 35 stops the rotary valve 16 at the position shown in FIG. It will be a bypass passage.

Therefore, when bouncing, the large diameter passage 17 of the piston rod valve assembly 14 and the center portion 16A of the rotary valve 16 are connected to the orifice 1.
6a, an oil bypass passage is formed from the orifice A of the valve rod 19, and during rebound, an oil passage from the small diameter passage 18 and the orifice A to the central portion 16A of the rotary valve 16 is formed. That is, the rotary valve main gear 35 is rotated to the left in FIG. 3, and the left end 3 of the fitting hole 35a is
5b and the stopper pin 36, the damping force of the suspension system can be guided to the "low" side.

In this embodiment, the reduction ratio between the reduction mechanism that rotates the rotary valve and the reduction mechanism that rotates the stopper plate is set to 1:1. Further, the rotation direction of the stopper plate 50 and the rotation direction of the rotary valve 16 become the same direction due to the reduction mechanism having the same combination of gears.

Therefore, the stopper plate 5 at this time
The 0 position rotates the internal gear part 95a of the stopper main gear 95, which is engaged with the internal meshing pinion 93, through the pinion 91 and reduction gear 92 when the DC motor 30 rotates. The position is as shown in a of the relationship between the stopper pin and the stopper plate in Figure 8. Here, while FIG. 8 is an explanatory diagram showing the cross section of the stopper plate 50 from below, FIG. 7 shows the cross section of the orifice of the rotary valve 16 from above. The direction of rotation is opposite.

Coil 54 constituting the plunger stopper
When the DC motor 30 is energized and the DC motor 30 is energized at the same time,
The DC motor 30 rotates the stopper plate 50 in FIG. 8a to the left, and the stopper rod 61 descends against the tension of the spring 63. The DC motor 30 rotates the stopper plate 50 approximately 60 degrees, and the stopper plate 50 and the stopper pin 51 come into contact with each other. Furthermore, when the stopper pin attachment member 52 comes into contact with the left standing portion 65a of the attachment member stopper 65, that is, the stopper plate 50 and the stopper pin 51, and the stopper pin attachment member 52 and the attachment member stopper 6
When the left standing portion 65b of the stopper plate 50 comes into contact with the left standing portion 65b of the stopper plate 50 at the same time, the stopper pin 51 restricts the rotation of the stopper plate 50. At this time, the rotary valve 16
is decelerated by the deceleration mechanism, rotates in the same direction as the stopper plate 50, and stops at the position shown in FIG. It will be a bypass passage.

Therefore, when bouncing, the large diameter passage 17 of the piston rod valve assembly 14 and the center portion 16A of the rotary valve 16 are connected to the orifice 1.
6a, an oil bypass passage from the orifice C of the valve rod 19 is formed, and during rebound, an oil passage from the small diameter passage 18 and the orifice C to the central portion 16A of the rotary valve 16 is formed. That is, the rotary valve main gear 35 is rotated to the center, and the stopper plate 50 is rotated.
If the stopper pin 51, the stopper pin attachment member 52, and the right standing portion 65a of the attachment member stopper 65 are simultaneously brought into contact with each other, the damping force of the suspension system can be guided to the "high" side.

Coil 54 constituting the plunger stopper
When the DC motor 30 is energized and the stopper plate 50 shown in FIG. Hole 35a
Rotation of the rotary valve main gear 35 is stopped at the position where the right end 35c and the stopper pin 36 come into contact. At this time, the rotary valve 16
The orifice 16a is in the position shown in FIG. 7c, and the orifice B of the valve rod 19 is used as an oil bypass passage.

In addition, the stopper plate 50 at this time is
Since the stopper rod 61 is operated in a raised state, it is rotated without being restricted by the stopper pin 51 and the stopper 65 for the mounting member, and the eighth
The position is shown in Figure c.

Therefore, when bouncing, the large diameter passage 17 of the piston rod valve assembly 14 and the center portion 16A of the rotary valve 16 are connected to the orifice 1.
6a, an oil bypass passage is formed in the orifice B of the valve rod 19, and during rebound, an oil passage in the central portion 16A of the rotary valve 16 is formed from the small diameter passage 18 and the orifice B. That is, the rotary valve main gear 35
is rotated to the right in Fig. 3, and the right end 35c of the fitting hole 35a comes into contact with the stopper pin 36, thereby reducing the damping force of the suspension system to "medium".
You can lead to the side.

Then, the rotary valve 16 shown in FIG. 7c
From the state of the orifice 16a, the DC motor 30
If we reverse the equation and simultaneously excite the coil 54, we get
The stopper plate 50 rotates to the right in FIG. The DC motor 30 rotates the stopper plate 50 in FIG. 8C to the right, and the stopper rod 61 descends against the tension of the spring 63. The DC motor 30 rotates the stopper plate 50 approximately 60 degrees so that it comes into contact with the stopper plate 50 and the stopper pin 51, and also rotates the stopper pin mounting member 52 and the stopper 65 for the mounting member.
When the left standing portion 65b comes into contact with the stopper plate 50, the rotation of the stopper plate 50 is stopped. At this time, the rotary valve 16 is decelerated by the deceleration mechanism, rotates in the same direction as the stopper plate 50, and stops at the position shown in FIG. 7b. At this time, the orifice 16a of the rotary valve 16
The orifice C of the valve rod 19 is used as an oil bypass passage.

Therefore, when bouncing, the large diameter passage 17 of the piston rod valve assembly 14 and the center portion 16A of the rotary valve 16 are connected to the orifice 1.
6a, an oil bypass passage from the orifice C of the valve rod 19 is formed, and during rebound, an oil passage from the small diameter passage 18 and the orifice C to the central portion 16A of the rotary valve 16 is formed. That is, the rotary valve main gear 35 is rotated to the center, and the stopper plate 50, the stopper pin 51, the stopper pin mounting member 52, and the right standing portion 6 of the stopper 65 for the mounting member are rotated.
5a, the damping force of the suspension system can be guided to the "high" side.

As described above, in this embodiment, the stopper plate 50 and the stopper pin 51 are connected to each other, and the stopper pin mounting member 52 and the stopper 65 for the mounting member are connected to each other.
The position of the orifice 16a of the rotary valve 16 when the left standing portion 65b of
The position of the orifice 16a of the rotary valve 16 is made to be the same when the stopper plate 50 and the stopper pin 51 and the stopper pin attachment member 52 and the right standing portion 65a of the attachment member stopper 65 are in contact with each other at the same time. , the shape of each stopper plate 50, the stopper pin 51, the left standing portion 65b of the mounting member stopper 65, and the right standing portion 6 of the mounting member stopper 65.
Determine the shape of 5a.

Therefore, when the stopper plate 50 rotates to the left and the stopper plate 50 and the stopper pin 51 come into contact as shown in FIG. 8b,
If the angle is θ2 degrees, the center of the stopper plate 50 is set at an intermediate position between FIG. 8a and FIG. 8c by the left standing portion 65b of the mounting member stopper 65. Then, the stopper plate 50 rotates to the right, and the stopper 65 for the mounting member
Due to the right standing portion 65a, the contact angle between the stopper plate 50 and the stopper pin 51 is adjusted to the eighth position.
The center of the stopper plate 50 shown in Figure d is
The angle that is the intermediate position between Figure a and Figure 8C may be set to θ1 degree.

In this embodiment, the speed reduction mechanism that rotates the rotary valve and the speed reduction mechanism that rotates the stopper plate have the same speed reduction ratio, but when implementing the present invention, the speed reduction ratio is not necessarily limited to the same. Instead, you can set any ratio. In particular, in the case where the reduction ratio is set to 1:1, the rotation angles of the rotary valve main gear and the stopper main gear are constant, which facilitates the design.

In principle, the reduction ratio between the reduction mechanism that rotates the rotary valve and the reduction mechanism that rotates the stopper plate is such that the rotation speed of the reduction mechanism that rotates the stopper plate reduces the rotation speed of the DC motor. If so, the rotation of the motor can be stopped more accurately and easily than a mechanism that directly uses the rotation of a DC motor.

The left and right rotation limit regulating means of the rotary valve incorporated in the speed reduction mechanism are not necessarily arranged in the fitting hole formed in the main gear for the rotary valve and in the fitting hole as in this embodiment. The configuration is not limited to the stopper pin provided, but a configuration in which a convex portion provided around the main gear for the rotary valve contacts the regulating member, or a fitting recess or a stopper pin provided on the rotary valve may be used. You may use the structure which provides a fitting convex part and abuts on a regulation member. In any case, the configuration is not limited.

Further, the relationship between the rotation angle and the diameter of the orifice in the above embodiments may be arbitrarily set depending on the embodiment when the present invention is implemented.

The rotary valve for switching the oil passage in the shock absorber is not limited to the configuration of this embodiment, as is the number of stages of the orifice and its diameter as described above.

[Effects of the Invention] As described above, the rotary actuator for controlling the rotation angle that switches the oil passage in the shock absorber in the suspension system that controls the damping force of the vehicle in three stages according to the present invention has a rotary actuator that controls both ends of the rotating shaft. A DC motor serving as a drive shaft, a reduction mechanism for rotating a rotary valve disposed at one end of the rotating shaft of the DC motor, and left and right rotation limit regulations for the rotary valve incorporated in the reduction mechanism. means, a deceleration mechanism for rotating a stopper plate disposed at the other end of the rotating shaft of the DC motor, a stopper pin for stopping rotation of the DC motor by contacting the stopper plate, and the rotary motor. A plunger stopper is provided with a mechanism for absorbing a difference between a position where the stopper pin restricts clockwise rotation and a position where the stopper pin restricts counterclockwise rotation at an intermediate stop position between the left and right rotation limits of the valve. It is housed in a cylindrical housing, and the housing is inserted into the shock absorber piston rod.

Therefore, since the rotary actuator for controlling the rotation angle is assembled by being housed in a substantially elongated cylindrical housing that is inserted into the absorber piston rod, the assemblability of the rotary actuator can be improved. Since the rotational output of the motor is decelerated using a deceleration mechanism that rotates a rotary valve and a deceleration mechanism that rotates a stopper plate, the rotation of the motor can be stopped accurately and easily. .

Furthermore, since the rotary actuator for controlling the rotation angle is built into the absorber piston rod, it can be protected from direct external force.
Furthermore, since the rotary actuator for controlling the rotation angle is not externally attached, the degree of freedom in mounting the suspension system can be increased. Further, since the rotary actuator for controlling the rotation angle of the present invention uses a mechanical stopper, the rotation angle can be set accurately and its responsiveness is good.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a main part of a rotary actuator for controlling a rotation angle according to an embodiment of the present invention, and FIG. 2 is a sectional view of a rotary actuator for controlling a rotation angle according to an embodiment of the present invention. 3 is an explanatory diagram showing the relationship between the rotary valve main gear reduction gear shaft and stopper pin when cut along the Y1-Y1 cutting line in FIG. 2; FIG. is the second
An explanatory diagram of the bracket that presses the main gear for the rotary valve when cut along the Y2-Y2 cutting line in the figure. Figure 5 shows the stopper for the mounting member and the stopper when cut along the Y3-Y3 cutting line in Figure 2. An explanatory diagram of the plate, Figure 6 is an explanatory diagram of the lead wire extraction when cut along the Y4-Y4 cutting line in Figure 2,
Fig. 7 is an explanatory diagram showing the switching state of the rotary valve when cut along the X1-X1 cutting line in Fig. 1, and Fig. 8 shows the stopper plate when cut along the X2-X2 cutting line in Fig. 1. FIG. 9 is an explanatory diagram showing the operating state of the stopper pin, and FIG. 9 is a perspective view of the main part of a conventional rotary actuator for controlling the rotation angle. In the figure, 10...shock absorber piston rod, 16... rotary valve, 30... DC motor, 35... main gear for rotary valve,
35a... Fitting hole portion, 36, 51... Stopper pin, 50... Stopper plate, 52... Stopper pin mounting member, 61... Stopper rod, 65
...stopper for mounting member, 70...housing. In addition, in the figures, the same reference numerals and symbols indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] 1. In a suspension system that controls the damping force of a vehicle in three stages using a rotary actuator that switches the oil passage in a shock absorber with a rotary valve, a motor with drive shafts at both ends of a rotating shaft; , a rotary valve driven by one drive shaft of the motor, left and right rotation limit regulating means of the rotary valve, a stopper plate driven by the other drive shaft of the motor, and a stopper plate driven by the other drive shaft of the motor; a deceleration mechanism interposed between the drive shaft and the stopper plate; and a retractable mechanism that comes into contact with the stopper plate and stops the rotation of the motor at an intermediate stop position between the left and right rotation limits of the rotary valve. A stopper pin, an actuator for moving the stopper pin in and out, and a mechanism for absorbing the difference between the position where the stopper pin restricts clockwise rotation and the position where it restricts counterclockwise rotation are each inserted into the shock absorber piston rod. A rotary actuator for rotation angle control featuring: 2. A patent characterized in that the mechanism for absorbing the difference between the position where the stopper pin restricts clockwise rotation and the position where it restricts counterclockwise rotation is a mechanism that allows the stopper pin to move by a predetermined amount in the direction of rotation of the stopper plate. A rotary actuator for rotational angle control according to claim 1. 3. The rotary actuator for rotational angle control according to claim 1, wherein a damping mechanism is interposed between one drive shaft of the motor and the rotary valve. 4. A patent characterized in that the left and right rotation limit regulating means of the rotary valve are constituted by a fitting hole formed in the main gear for the rotary valve and a stopper pin arranged in the fitting hole. A rotary actuator for rotational angle control according to claim 1.